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/Sema/CXXFieldCollector.h" 16 #include "clang/Sema/Scope.h" 17 #include "clang/Sema/Initialization.h" 18 #include "clang/Sema/Lookup.h" 19 #include "clang/Sema/ScopeInfo.h" 20 #include "clang/AST/ASTConsumer.h" 21 #include "clang/AST/ASTContext.h" 22 #include "clang/AST/ASTMutationListener.h" 23 #include "clang/AST/CharUnits.h" 24 #include "clang/AST/CXXInheritance.h" 25 #include "clang/AST/DeclVisitor.h" 26 #include "clang/AST/EvaluatedExprVisitor.h" 27 #include "clang/AST/ExprCXX.h" 28 #include "clang/AST/RecordLayout.h" 29 #include "clang/AST/RecursiveASTVisitor.h" 30 #include "clang/AST/StmtVisitor.h" 31 #include "clang/AST/TypeLoc.h" 32 #include "clang/AST/TypeOrdering.h" 33 #include "clang/Sema/DeclSpec.h" 34 #include "clang/Sema/ParsedTemplate.h" 35 #include "clang/Basic/PartialDiagnostic.h" 36 #include "clang/Lex/Preprocessor.h" 37 #include "llvm/ADT/SmallString.h" 38 #include "llvm/ADT/STLExtras.h" 39 #include <map> 40 #include <set> 41 42 using namespace clang; 43 44 //===----------------------------------------------------------------------===// 45 // CheckDefaultArgumentVisitor 46 //===----------------------------------------------------------------------===// 47 48 namespace { 49 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 50 /// the default argument of a parameter to determine whether it 51 /// contains any ill-formed subexpressions. For example, this will 52 /// diagnose the use of local variables or parameters within the 53 /// default argument expression. 54 class CheckDefaultArgumentVisitor 55 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 56 Expr *DefaultArg; 57 Sema *S; 58 59 public: 60 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 61 : DefaultArg(defarg), S(s) {} 62 63 bool VisitExpr(Expr *Node); 64 bool VisitDeclRefExpr(DeclRefExpr *DRE); 65 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 66 bool VisitLambdaExpr(LambdaExpr *Lambda); 67 }; 68 69 /// VisitExpr - Visit all of the children of this expression. 70 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 71 bool IsInvalid = false; 72 for (Stmt::child_range I = Node->children(); I; ++I) 73 IsInvalid |= Visit(*I); 74 return IsInvalid; 75 } 76 77 /// VisitDeclRefExpr - Visit a reference to a declaration, to 78 /// determine whether this declaration can be used in the default 79 /// argument expression. 80 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 81 NamedDecl *Decl = DRE->getDecl(); 82 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 83 // C++ [dcl.fct.default]p9 84 // Default arguments are evaluated each time the function is 85 // called. The order of evaluation of function arguments is 86 // unspecified. Consequently, parameters of a function shall not 87 // be used in default argument expressions, even if they are not 88 // evaluated. Parameters of a function declared before a default 89 // argument expression are in scope and can hide namespace and 90 // class member names. 91 return S->Diag(DRE->getLocStart(), 92 diag::err_param_default_argument_references_param) 93 << Param->getDeclName() << DefaultArg->getSourceRange(); 94 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 95 // C++ [dcl.fct.default]p7 96 // Local variables shall not be used in default argument 97 // expressions. 98 if (VDecl->isLocalVarDecl()) 99 return S->Diag(DRE->getLocStart(), 100 diag::err_param_default_argument_references_local) 101 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 102 } 103 104 return false; 105 } 106 107 /// VisitCXXThisExpr - Visit a C++ "this" expression. 108 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 109 // C++ [dcl.fct.default]p8: 110 // The keyword this shall not be used in a default argument of a 111 // member function. 112 return S->Diag(ThisE->getLocStart(), 113 diag::err_param_default_argument_references_this) 114 << ThisE->getSourceRange(); 115 } 116 117 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 118 // C++11 [expr.lambda.prim]p13: 119 // A lambda-expression appearing in a default argument shall not 120 // implicitly or explicitly capture any entity. 121 if (Lambda->capture_begin() == Lambda->capture_end()) 122 return false; 123 124 return S->Diag(Lambda->getLocStart(), 125 diag::err_lambda_capture_default_arg); 126 } 127 } 128 129 void Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, 130 CXXMethodDecl *Method) { 131 // If we have an MSAny spec already, don't bother. 132 if (!Method || ComputedEST == EST_MSAny) 133 return; 134 135 const FunctionProtoType *Proto 136 = Method->getType()->getAs<FunctionProtoType>(); 137 Proto = Self->ResolveExceptionSpec(CallLoc, Proto); 138 if (!Proto) 139 return; 140 141 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 142 143 // If this function can throw any exceptions, make a note of that. 144 if (EST == EST_MSAny || EST == EST_None) { 145 ClearExceptions(); 146 ComputedEST = EST; 147 return; 148 } 149 150 // FIXME: If the call to this decl is using any of its default arguments, we 151 // need to search them for potentially-throwing calls. 152 153 // If this function has a basic noexcept, it doesn't affect the outcome. 154 if (EST == EST_BasicNoexcept) 155 return; 156 157 // If we have a throw-all spec at this point, ignore the function. 158 if (ComputedEST == EST_None) 159 return; 160 161 // If we're still at noexcept(true) and there's a nothrow() callee, 162 // change to that specification. 163 if (EST == EST_DynamicNone) { 164 if (ComputedEST == EST_BasicNoexcept) 165 ComputedEST = EST_DynamicNone; 166 return; 167 } 168 169 // Check out noexcept specs. 170 if (EST == EST_ComputedNoexcept) { 171 FunctionProtoType::NoexceptResult NR = 172 Proto->getNoexceptSpec(Self->Context); 173 assert(NR != FunctionProtoType::NR_NoNoexcept && 174 "Must have noexcept result for EST_ComputedNoexcept."); 175 assert(NR != FunctionProtoType::NR_Dependent && 176 "Should not generate implicit declarations for dependent cases, " 177 "and don't know how to handle them anyway."); 178 179 // noexcept(false) -> no spec on the new function 180 if (NR == FunctionProtoType::NR_Throw) { 181 ClearExceptions(); 182 ComputedEST = EST_None; 183 } 184 // noexcept(true) won't change anything either. 185 return; 186 } 187 188 assert(EST == EST_Dynamic && "EST case not considered earlier."); 189 assert(ComputedEST != EST_None && 190 "Shouldn't collect exceptions when throw-all is guaranteed."); 191 ComputedEST = EST_Dynamic; 192 // Record the exceptions in this function's exception specification. 193 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 194 EEnd = Proto->exception_end(); 195 E != EEnd; ++E) 196 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E))) 197 Exceptions.push_back(*E); 198 } 199 200 void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 201 if (!E || ComputedEST == EST_MSAny) 202 return; 203 204 // FIXME: 205 // 206 // C++0x [except.spec]p14: 207 // [An] implicit exception-specification specifies the type-id T if and 208 // only if T is allowed by the exception-specification of a function directly 209 // invoked by f's implicit definition; f shall allow all exceptions if any 210 // function it directly invokes allows all exceptions, and f shall allow no 211 // exceptions if every function it directly invokes allows no exceptions. 212 // 213 // Note in particular that if an implicit exception-specification is generated 214 // for a function containing a throw-expression, that specification can still 215 // be noexcept(true). 216 // 217 // Note also that 'directly invoked' is not defined in the standard, and there 218 // is no indication that we should only consider potentially-evaluated calls. 219 // 220 // Ultimately we should implement the intent of the standard: the exception 221 // specification should be the set of exceptions which can be thrown by the 222 // implicit definition. For now, we assume that any non-nothrow expression can 223 // throw any exception. 224 225 if (Self->canThrow(E)) 226 ComputedEST = EST_None; 227 } 228 229 bool 230 Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 231 SourceLocation EqualLoc) { 232 if (RequireCompleteType(Param->getLocation(), Param->getType(), 233 diag::err_typecheck_decl_incomplete_type)) { 234 Param->setInvalidDecl(); 235 return true; 236 } 237 238 // C++ [dcl.fct.default]p5 239 // A default argument expression is implicitly converted (clause 240 // 4) to the parameter type. The default argument expression has 241 // the same semantic constraints as the initializer expression in 242 // a declaration of a variable of the parameter type, using the 243 // copy-initialization semantics (8.5). 244 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 245 Param); 246 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 247 EqualLoc); 248 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 249 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg); 250 if (Result.isInvalid()) 251 return true; 252 Arg = Result.takeAs<Expr>(); 253 254 CheckImplicitConversions(Arg, EqualLoc); 255 Arg = MaybeCreateExprWithCleanups(Arg); 256 257 // Okay: add the default argument to the parameter 258 Param->setDefaultArg(Arg); 259 260 // We have already instantiated this parameter; provide each of the 261 // instantiations with the uninstantiated default argument. 262 UnparsedDefaultArgInstantiationsMap::iterator InstPos 263 = UnparsedDefaultArgInstantiations.find(Param); 264 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 265 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 266 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 267 268 // We're done tracking this parameter's instantiations. 269 UnparsedDefaultArgInstantiations.erase(InstPos); 270 } 271 272 return false; 273 } 274 275 /// ActOnParamDefaultArgument - Check whether the default argument 276 /// provided for a function parameter is well-formed. If so, attach it 277 /// to the parameter declaration. 278 void 279 Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 280 Expr *DefaultArg) { 281 if (!param || !DefaultArg) 282 return; 283 284 ParmVarDecl *Param = cast<ParmVarDecl>(param); 285 UnparsedDefaultArgLocs.erase(Param); 286 287 // Default arguments are only permitted in C++ 288 if (!getLangOpts().CPlusPlus) { 289 Diag(EqualLoc, diag::err_param_default_argument) 290 << DefaultArg->getSourceRange(); 291 Param->setInvalidDecl(); 292 return; 293 } 294 295 // Check for unexpanded parameter packs. 296 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 297 Param->setInvalidDecl(); 298 return; 299 } 300 301 // Check that the default argument is well-formed 302 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 303 if (DefaultArgChecker.Visit(DefaultArg)) { 304 Param->setInvalidDecl(); 305 return; 306 } 307 308 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 309 } 310 311 /// ActOnParamUnparsedDefaultArgument - We've seen a default 312 /// argument for a function parameter, but we can't parse it yet 313 /// because we're inside a class definition. Note that this default 314 /// argument will be parsed later. 315 void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 316 SourceLocation EqualLoc, 317 SourceLocation ArgLoc) { 318 if (!param) 319 return; 320 321 ParmVarDecl *Param = cast<ParmVarDecl>(param); 322 if (Param) 323 Param->setUnparsedDefaultArg(); 324 325 UnparsedDefaultArgLocs[Param] = ArgLoc; 326 } 327 328 /// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 329 /// the default argument for the parameter param failed. 330 void Sema::ActOnParamDefaultArgumentError(Decl *param) { 331 if (!param) 332 return; 333 334 ParmVarDecl *Param = cast<ParmVarDecl>(param); 335 336 Param->setInvalidDecl(); 337 338 UnparsedDefaultArgLocs.erase(Param); 339 } 340 341 /// CheckExtraCXXDefaultArguments - Check for any extra default 342 /// arguments in the declarator, which is not a function declaration 343 /// or definition and therefore is not permitted to have default 344 /// arguments. This routine should be invoked for every declarator 345 /// that is not a function declaration or definition. 346 void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 347 // C++ [dcl.fct.default]p3 348 // A default argument expression shall be specified only in the 349 // parameter-declaration-clause of a function declaration or in a 350 // template-parameter (14.1). It shall not be specified for a 351 // parameter pack. If it is specified in a 352 // parameter-declaration-clause, it shall not occur within a 353 // declarator or abstract-declarator of a parameter-declaration. 354 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 355 DeclaratorChunk &chunk = D.getTypeObject(i); 356 if (chunk.Kind == DeclaratorChunk::Function) { 357 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 358 ParmVarDecl *Param = 359 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 360 if (Param->hasUnparsedDefaultArg()) { 361 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 362 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 363 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 364 delete Toks; 365 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 366 } else if (Param->getDefaultArg()) { 367 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 368 << Param->getDefaultArg()->getSourceRange(); 369 Param->setDefaultArg(0); 370 } 371 } 372 } 373 } 374 } 375 376 // MergeCXXFunctionDecl - Merge two declarations of the same C++ 377 // function, once we already know that they have the same 378 // type. Subroutine of MergeFunctionDecl. Returns true if there was an 379 // error, false otherwise. 380 bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, 381 Scope *S) { 382 bool Invalid = false; 383 384 // C++ [dcl.fct.default]p4: 385 // For non-template functions, default arguments can be added in 386 // later declarations of a function in the same 387 // scope. Declarations in different scopes have completely 388 // distinct sets of default arguments. That is, declarations in 389 // inner scopes do not acquire default arguments from 390 // declarations in outer scopes, and vice versa. In a given 391 // function declaration, all parameters subsequent to a 392 // parameter with a default argument shall have default 393 // arguments supplied in this or previous declarations. A 394 // default argument shall not be redefined by a later 395 // declaration (not even to the same value). 396 // 397 // C++ [dcl.fct.default]p6: 398 // Except for member functions of class templates, the default arguments 399 // in a member function definition that appears outside of the class 400 // definition are added to the set of default arguments provided by the 401 // member function declaration in the class definition. 402 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 403 ParmVarDecl *OldParam = Old->getParamDecl(p); 404 ParmVarDecl *NewParam = New->getParamDecl(p); 405 406 bool OldParamHasDfl = OldParam->hasDefaultArg(); 407 bool NewParamHasDfl = NewParam->hasDefaultArg(); 408 409 NamedDecl *ND = Old; 410 if (S && !isDeclInScope(ND, New->getDeclContext(), S)) 411 // Ignore default parameters of old decl if they are not in 412 // the same scope. 413 OldParamHasDfl = false; 414 415 if (OldParamHasDfl && NewParamHasDfl) { 416 417 unsigned DiagDefaultParamID = 418 diag::err_param_default_argument_redefinition; 419 420 // MSVC accepts that default parameters be redefined for member functions 421 // of template class. The new default parameter's value is ignored. 422 Invalid = true; 423 if (getLangOpts().MicrosoftExt) { 424 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 425 if (MD && MD->getParent()->getDescribedClassTemplate()) { 426 // Merge the old default argument into the new parameter. 427 NewParam->setHasInheritedDefaultArg(); 428 if (OldParam->hasUninstantiatedDefaultArg()) 429 NewParam->setUninstantiatedDefaultArg( 430 OldParam->getUninstantiatedDefaultArg()); 431 else 432 NewParam->setDefaultArg(OldParam->getInit()); 433 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 434 Invalid = false; 435 } 436 } 437 438 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 439 // hint here. Alternatively, we could walk the type-source information 440 // for NewParam to find the last source location in the type... but it 441 // isn't worth the effort right now. This is the kind of test case that 442 // is hard to get right: 443 // int f(int); 444 // void g(int (*fp)(int) = f); 445 // void g(int (*fp)(int) = &f); 446 Diag(NewParam->getLocation(), DiagDefaultParamID) 447 << NewParam->getDefaultArgRange(); 448 449 // Look for the function declaration where the default argument was 450 // actually written, which may be a declaration prior to Old. 451 for (FunctionDecl *Older = Old->getPreviousDecl(); 452 Older; Older = Older->getPreviousDecl()) { 453 if (!Older->getParamDecl(p)->hasDefaultArg()) 454 break; 455 456 OldParam = Older->getParamDecl(p); 457 } 458 459 Diag(OldParam->getLocation(), diag::note_previous_definition) 460 << OldParam->getDefaultArgRange(); 461 } else if (OldParamHasDfl) { 462 // Merge the old default argument into the new parameter. 463 // It's important to use getInit() here; getDefaultArg() 464 // strips off any top-level ExprWithCleanups. 465 NewParam->setHasInheritedDefaultArg(); 466 if (OldParam->hasUninstantiatedDefaultArg()) 467 NewParam->setUninstantiatedDefaultArg( 468 OldParam->getUninstantiatedDefaultArg()); 469 else 470 NewParam->setDefaultArg(OldParam->getInit()); 471 } else if (NewParamHasDfl) { 472 if (New->getDescribedFunctionTemplate()) { 473 // Paragraph 4, quoted above, only applies to non-template functions. 474 Diag(NewParam->getLocation(), 475 diag::err_param_default_argument_template_redecl) 476 << NewParam->getDefaultArgRange(); 477 Diag(Old->getLocation(), diag::note_template_prev_declaration) 478 << false; 479 } else if (New->getTemplateSpecializationKind() 480 != TSK_ImplicitInstantiation && 481 New->getTemplateSpecializationKind() != TSK_Undeclared) { 482 // C++ [temp.expr.spec]p21: 483 // Default function arguments shall not be specified in a declaration 484 // or a definition for one of the following explicit specializations: 485 // - the explicit specialization of a function template; 486 // - the explicit specialization of a member function template; 487 // - the explicit specialization of a member function of a class 488 // template where the class template specialization to which the 489 // member function specialization belongs is implicitly 490 // instantiated. 491 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 492 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 493 << New->getDeclName() 494 << NewParam->getDefaultArgRange(); 495 } else if (New->getDeclContext()->isDependentContext()) { 496 // C++ [dcl.fct.default]p6 (DR217): 497 // Default arguments for a member function of a class template shall 498 // be specified on the initial declaration of the member function 499 // within the class template. 500 // 501 // Reading the tea leaves a bit in DR217 and its reference to DR205 502 // leads me to the conclusion that one cannot add default function 503 // arguments for an out-of-line definition of a member function of a 504 // dependent type. 505 int WhichKind = 2; 506 if (CXXRecordDecl *Record 507 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 508 if (Record->getDescribedClassTemplate()) 509 WhichKind = 0; 510 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 511 WhichKind = 1; 512 else 513 WhichKind = 2; 514 } 515 516 Diag(NewParam->getLocation(), 517 diag::err_param_default_argument_member_template_redecl) 518 << WhichKind 519 << NewParam->getDefaultArgRange(); 520 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 521 CXXSpecialMember NewSM = getSpecialMember(Ctor), 522 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 523 if (NewSM != OldSM) { 524 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 525 << NewParam->getDefaultArgRange() << NewSM; 526 Diag(Old->getLocation(), diag::note_previous_declaration_special) 527 << OldSM; 528 } 529 } 530 } 531 } 532 533 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 534 // template has a constexpr specifier then all its declarations shall 535 // contain the constexpr specifier. 536 if (New->isConstexpr() != Old->isConstexpr()) { 537 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 538 << New << New->isConstexpr(); 539 Diag(Old->getLocation(), diag::note_previous_declaration); 540 Invalid = true; 541 } 542 543 if (CheckEquivalentExceptionSpec(Old, New)) 544 Invalid = true; 545 546 return Invalid; 547 } 548 549 /// \brief Merge the exception specifications of two variable declarations. 550 /// 551 /// This is called when there's a redeclaration of a VarDecl. The function 552 /// checks if the redeclaration might have an exception specification and 553 /// validates compatibility and merges the specs if necessary. 554 void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 555 // Shortcut if exceptions are disabled. 556 if (!getLangOpts().CXXExceptions) 557 return; 558 559 assert(Context.hasSameType(New->getType(), Old->getType()) && 560 "Should only be called if types are otherwise the same."); 561 562 QualType NewType = New->getType(); 563 QualType OldType = Old->getType(); 564 565 // We're only interested in pointers and references to functions, as well 566 // as pointers to member functions. 567 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 568 NewType = R->getPointeeType(); 569 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 570 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 571 NewType = P->getPointeeType(); 572 OldType = OldType->getAs<PointerType>()->getPointeeType(); 573 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 574 NewType = M->getPointeeType(); 575 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 576 } 577 578 if (!NewType->isFunctionProtoType()) 579 return; 580 581 // There's lots of special cases for functions. For function pointers, system 582 // libraries are hopefully not as broken so that we don't need these 583 // workarounds. 584 if (CheckEquivalentExceptionSpec( 585 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 586 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 587 New->setInvalidDecl(); 588 } 589 } 590 591 /// CheckCXXDefaultArguments - Verify that the default arguments for a 592 /// function declaration are well-formed according to C++ 593 /// [dcl.fct.default]. 594 void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 595 unsigned NumParams = FD->getNumParams(); 596 unsigned p; 597 598 bool IsLambda = FD->getOverloadedOperator() == OO_Call && 599 isa<CXXMethodDecl>(FD) && 600 cast<CXXMethodDecl>(FD)->getParent()->isLambda(); 601 602 // Find first parameter with a default argument 603 for (p = 0; p < NumParams; ++p) { 604 ParmVarDecl *Param = FD->getParamDecl(p); 605 if (Param->hasDefaultArg()) { 606 // C++11 [expr.prim.lambda]p5: 607 // [...] Default arguments (8.3.6) shall not be specified in the 608 // parameter-declaration-clause of a lambda-declarator. 609 // 610 // FIXME: Core issue 974 strikes this sentence, we only provide an 611 // extension warning. 612 if (IsLambda) 613 Diag(Param->getLocation(), diag::ext_lambda_default_arguments) 614 << Param->getDefaultArgRange(); 615 break; 616 } 617 } 618 619 // C++ [dcl.fct.default]p4: 620 // In a given function declaration, all parameters 621 // subsequent to a parameter with a default argument shall 622 // have default arguments supplied in this or previous 623 // declarations. A default argument shall not be redefined 624 // by a later declaration (not even to the same value). 625 unsigned LastMissingDefaultArg = 0; 626 for (; p < NumParams; ++p) { 627 ParmVarDecl *Param = FD->getParamDecl(p); 628 if (!Param->hasDefaultArg()) { 629 if (Param->isInvalidDecl()) 630 /* We already complained about this parameter. */; 631 else if (Param->getIdentifier()) 632 Diag(Param->getLocation(), 633 diag::err_param_default_argument_missing_name) 634 << Param->getIdentifier(); 635 else 636 Diag(Param->getLocation(), 637 diag::err_param_default_argument_missing); 638 639 LastMissingDefaultArg = p; 640 } 641 } 642 643 if (LastMissingDefaultArg > 0) { 644 // Some default arguments were missing. Clear out all of the 645 // default arguments up to (and including) the last missing 646 // default argument, so that we leave the function parameters 647 // in a semantically valid state. 648 for (p = 0; p <= LastMissingDefaultArg; ++p) { 649 ParmVarDecl *Param = FD->getParamDecl(p); 650 if (Param->hasDefaultArg()) { 651 Param->setDefaultArg(0); 652 } 653 } 654 } 655 } 656 657 // CheckConstexprParameterTypes - Check whether a function's parameter types 658 // are all literal types. If so, return true. If not, produce a suitable 659 // diagnostic and return false. 660 static bool CheckConstexprParameterTypes(Sema &SemaRef, 661 const FunctionDecl *FD) { 662 unsigned ArgIndex = 0; 663 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 664 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 665 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 666 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 667 SourceLocation ParamLoc = PD->getLocation(); 668 if (!(*i)->isDependentType() && 669 SemaRef.RequireLiteralType(ParamLoc, *i, 670 diag::err_constexpr_non_literal_param, 671 ArgIndex+1, PD->getSourceRange(), 672 isa<CXXConstructorDecl>(FD))) 673 return false; 674 } 675 return true; 676 } 677 678 /// \brief Get diagnostic %select index for tag kind for 679 /// record diagnostic message. 680 /// WARNING: Indexes apply to particular diagnostics only! 681 /// 682 /// \returns diagnostic %select index. 683 static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) { 684 switch (Tag) { 685 case TTK_Struct: return 0; 686 case TTK_Interface: return 1; 687 case TTK_Class: return 2; 688 default: llvm_unreachable("Invalid tag kind for record diagnostic!"); 689 } 690 } 691 692 // CheckConstexprFunctionDecl - Check whether a function declaration satisfies 693 // the requirements of a constexpr function definition or a constexpr 694 // constructor definition. If so, return true. If not, produce appropriate 695 // diagnostics and return false. 696 // 697 // This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 698 bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 699 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 700 if (MD && MD->isInstance()) { 701 // C++11 [dcl.constexpr]p4: 702 // The definition of a constexpr constructor shall satisfy the following 703 // constraints: 704 // - the class shall not have any virtual base classes; 705 const CXXRecordDecl *RD = MD->getParent(); 706 if (RD->getNumVBases()) { 707 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 708 << isa<CXXConstructorDecl>(NewFD) 709 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 710 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 711 E = RD->vbases_end(); I != E; ++I) 712 Diag(I->getLocStart(), 713 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 714 return false; 715 } 716 } 717 718 if (!isa<CXXConstructorDecl>(NewFD)) { 719 // C++11 [dcl.constexpr]p3: 720 // The definition of a constexpr function shall satisfy the following 721 // constraints: 722 // - it shall not be virtual; 723 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 724 if (Method && Method->isVirtual()) { 725 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 726 727 // If it's not obvious why this function is virtual, find an overridden 728 // function which uses the 'virtual' keyword. 729 const CXXMethodDecl *WrittenVirtual = Method; 730 while (!WrittenVirtual->isVirtualAsWritten()) 731 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 732 if (WrittenVirtual != Method) 733 Diag(WrittenVirtual->getLocation(), 734 diag::note_overridden_virtual_function); 735 return false; 736 } 737 738 // - its return type shall be a literal type; 739 QualType RT = NewFD->getResultType(); 740 if (!RT->isDependentType() && 741 RequireLiteralType(NewFD->getLocation(), RT, 742 diag::err_constexpr_non_literal_return)) 743 return false; 744 } 745 746 // - each of its parameter types shall be a literal type; 747 if (!CheckConstexprParameterTypes(*this, NewFD)) 748 return false; 749 750 return true; 751 } 752 753 /// Check the given declaration statement is legal within a constexpr function 754 /// body. C++0x [dcl.constexpr]p3,p4. 755 /// 756 /// \return true if the body is OK, false if we have diagnosed a problem. 757 static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 758 DeclStmt *DS) { 759 // C++0x [dcl.constexpr]p3 and p4: 760 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 761 // contain only 762 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 763 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 764 switch ((*DclIt)->getKind()) { 765 case Decl::StaticAssert: 766 case Decl::Using: 767 case Decl::UsingShadow: 768 case Decl::UsingDirective: 769 case Decl::UnresolvedUsingTypename: 770 // - static_assert-declarations 771 // - using-declarations, 772 // - using-directives, 773 continue; 774 775 case Decl::Typedef: 776 case Decl::TypeAlias: { 777 // - typedef declarations and alias-declarations that do not define 778 // classes or enumerations, 779 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 780 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 781 // Don't allow variably-modified types in constexpr functions. 782 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 783 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 784 << TL.getSourceRange() << TL.getType() 785 << isa<CXXConstructorDecl>(Dcl); 786 return false; 787 } 788 continue; 789 } 790 791 case Decl::Enum: 792 case Decl::CXXRecord: 793 // As an extension, we allow the declaration (but not the definition) of 794 // classes and enumerations in all declarations, not just in typedef and 795 // alias declarations. 796 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 797 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 798 << isa<CXXConstructorDecl>(Dcl); 799 return false; 800 } 801 continue; 802 803 case Decl::Var: 804 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 805 << isa<CXXConstructorDecl>(Dcl); 806 return false; 807 808 default: 809 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 810 << isa<CXXConstructorDecl>(Dcl); 811 return false; 812 } 813 } 814 815 return true; 816 } 817 818 /// Check that the given field is initialized within a constexpr constructor. 819 /// 820 /// \param Dcl The constexpr constructor being checked. 821 /// \param Field The field being checked. This may be a member of an anonymous 822 /// struct or union nested within the class being checked. 823 /// \param Inits All declarations, including anonymous struct/union members and 824 /// indirect members, for which any initialization was provided. 825 /// \param Diagnosed Set to true if an error is produced. 826 static void CheckConstexprCtorInitializer(Sema &SemaRef, 827 const FunctionDecl *Dcl, 828 FieldDecl *Field, 829 llvm::SmallSet<Decl*, 16> &Inits, 830 bool &Diagnosed) { 831 if (Field->isUnnamedBitfield()) 832 return; 833 834 if (Field->isAnonymousStructOrUnion() && 835 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 836 return; 837 838 if (!Inits.count(Field)) { 839 if (!Diagnosed) { 840 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 841 Diagnosed = true; 842 } 843 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 844 } else if (Field->isAnonymousStructOrUnion()) { 845 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 846 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 847 I != E; ++I) 848 // If an anonymous union contains an anonymous struct of which any member 849 // is initialized, all members must be initialized. 850 if (!RD->isUnion() || Inits.count(*I)) 851 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 852 } 853 } 854 855 /// Check the body for the given constexpr function declaration only contains 856 /// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 857 /// 858 /// \return true if the body is OK, false if we have diagnosed a problem. 859 bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 860 if (isa<CXXTryStmt>(Body)) { 861 // C++11 [dcl.constexpr]p3: 862 // The definition of a constexpr function shall satisfy the following 863 // constraints: [...] 864 // - its function-body shall be = delete, = default, or a 865 // compound-statement 866 // 867 // C++11 [dcl.constexpr]p4: 868 // In the definition of a constexpr constructor, [...] 869 // - its function-body shall not be a function-try-block; 870 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 871 << isa<CXXConstructorDecl>(Dcl); 872 return false; 873 } 874 875 // - its function-body shall be [...] a compound-statement that contains only 876 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 877 878 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 879 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 880 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 881 switch ((*BodyIt)->getStmtClass()) { 882 case Stmt::NullStmtClass: 883 // - null statements, 884 continue; 885 886 case Stmt::DeclStmtClass: 887 // - static_assert-declarations 888 // - using-declarations, 889 // - using-directives, 890 // - typedef declarations and alias-declarations that do not define 891 // classes or enumerations, 892 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 893 return false; 894 continue; 895 896 case Stmt::ReturnStmtClass: 897 // - and exactly one return statement; 898 if (isa<CXXConstructorDecl>(Dcl)) 899 break; 900 901 ReturnStmts.push_back((*BodyIt)->getLocStart()); 902 continue; 903 904 default: 905 break; 906 } 907 908 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 909 << isa<CXXConstructorDecl>(Dcl); 910 return false; 911 } 912 913 if (const CXXConstructorDecl *Constructor 914 = dyn_cast<CXXConstructorDecl>(Dcl)) { 915 const CXXRecordDecl *RD = Constructor->getParent(); 916 // DR1359: 917 // - every non-variant non-static data member and base class sub-object 918 // shall be initialized; 919 // - if the class is a non-empty union, or for each non-empty anonymous 920 // union member of a non-union class, exactly one non-static data member 921 // shall be initialized; 922 if (RD->isUnion()) { 923 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 924 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 925 return false; 926 } 927 } else if (!Constructor->isDependentContext() && 928 !Constructor->isDelegatingConstructor()) { 929 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 930 931 // Skip detailed checking if we have enough initializers, and we would 932 // allow at most one initializer per member. 933 bool AnyAnonStructUnionMembers = false; 934 unsigned Fields = 0; 935 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 936 E = RD->field_end(); I != E; ++I, ++Fields) { 937 if (I->isAnonymousStructOrUnion()) { 938 AnyAnonStructUnionMembers = true; 939 break; 940 } 941 } 942 if (AnyAnonStructUnionMembers || 943 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 944 // Check initialization of non-static data members. Base classes are 945 // always initialized so do not need to be checked. Dependent bases 946 // might not have initializers in the member initializer list. 947 llvm::SmallSet<Decl*, 16> Inits; 948 for (CXXConstructorDecl::init_const_iterator 949 I = Constructor->init_begin(), E = Constructor->init_end(); 950 I != E; ++I) { 951 if (FieldDecl *FD = (*I)->getMember()) 952 Inits.insert(FD); 953 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 954 Inits.insert(ID->chain_begin(), ID->chain_end()); 955 } 956 957 bool Diagnosed = false; 958 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 959 E = RD->field_end(); I != E; ++I) 960 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 961 if (Diagnosed) 962 return false; 963 } 964 } 965 } else { 966 if (ReturnStmts.empty()) { 967 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 968 return false; 969 } 970 if (ReturnStmts.size() > 1) { 971 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 972 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 973 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 974 return false; 975 } 976 } 977 978 // C++11 [dcl.constexpr]p5: 979 // if no function argument values exist such that the function invocation 980 // substitution would produce a constant expression, the program is 981 // ill-formed; no diagnostic required. 982 // C++11 [dcl.constexpr]p3: 983 // - every constructor call and implicit conversion used in initializing the 984 // return value shall be one of those allowed in a constant expression. 985 // C++11 [dcl.constexpr]p4: 986 // - every constructor involved in initializing non-static data members and 987 // base class sub-objects shall be a constexpr constructor. 988 llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 989 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 990 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr) 991 << isa<CXXConstructorDecl>(Dcl); 992 for (size_t I = 0, N = Diags.size(); I != N; ++I) 993 Diag(Diags[I].first, Diags[I].second); 994 return false; 995 } 996 997 return true; 998 } 999 1000 /// isCurrentClassName - Determine whether the identifier II is the 1001 /// name of the class type currently being defined. In the case of 1002 /// nested classes, this will only return true if II is the name of 1003 /// the innermost class. 1004 bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 1005 const CXXScopeSpec *SS) { 1006 assert(getLangOpts().CPlusPlus && "No class names in C!"); 1007 1008 CXXRecordDecl *CurDecl; 1009 if (SS && SS->isSet() && !SS->isInvalid()) { 1010 DeclContext *DC = computeDeclContext(*SS, true); 1011 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 1012 } else 1013 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1014 1015 if (CurDecl && CurDecl->getIdentifier()) 1016 return &II == CurDecl->getIdentifier(); 1017 else 1018 return false; 1019 } 1020 1021 /// \brief Check the validity of a C++ base class specifier. 1022 /// 1023 /// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1024 /// and returns NULL otherwise. 1025 CXXBaseSpecifier * 1026 Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1027 SourceRange SpecifierRange, 1028 bool Virtual, AccessSpecifier Access, 1029 TypeSourceInfo *TInfo, 1030 SourceLocation EllipsisLoc) { 1031 QualType BaseType = TInfo->getType(); 1032 1033 // C++ [class.union]p1: 1034 // A union shall not have base classes. 1035 if (Class->isUnion()) { 1036 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1037 << SpecifierRange; 1038 return 0; 1039 } 1040 1041 if (EllipsisLoc.isValid() && 1042 !TInfo->getType()->containsUnexpandedParameterPack()) { 1043 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1044 << TInfo->getTypeLoc().getSourceRange(); 1045 EllipsisLoc = SourceLocation(); 1046 } 1047 1048 if (BaseType->isDependentType()) 1049 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1050 Class->getTagKind() == TTK_Class, 1051 Access, TInfo, EllipsisLoc); 1052 1053 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1054 1055 // Base specifiers must be record types. 1056 if (!BaseType->isRecordType()) { 1057 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1058 return 0; 1059 } 1060 1061 // C++ [class.union]p1: 1062 // A union shall not be used as a base class. 1063 if (BaseType->isUnionType()) { 1064 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1065 return 0; 1066 } 1067 1068 // C++ [class.derived]p2: 1069 // The class-name in a base-specifier shall not be an incompletely 1070 // defined class. 1071 if (RequireCompleteType(BaseLoc, BaseType, 1072 diag::err_incomplete_base_class, SpecifierRange)) { 1073 Class->setInvalidDecl(); 1074 return 0; 1075 } 1076 1077 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1078 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1079 assert(BaseDecl && "Record type has no declaration"); 1080 BaseDecl = BaseDecl->getDefinition(); 1081 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1082 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1083 assert(CXXBaseDecl && "Base type is not a C++ type"); 1084 1085 // C++ [class]p3: 1086 // If a class is marked final and it appears as a base-type-specifier in 1087 // base-clause, the program is ill-formed. 1088 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1089 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1090 << CXXBaseDecl->getDeclName(); 1091 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1092 << CXXBaseDecl->getDeclName(); 1093 return 0; 1094 } 1095 1096 if (BaseDecl->isInvalidDecl()) 1097 Class->setInvalidDecl(); 1098 1099 // Create the base specifier. 1100 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1101 Class->getTagKind() == TTK_Class, 1102 Access, TInfo, EllipsisLoc); 1103 } 1104 1105 /// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1106 /// one entry in the base class list of a class specifier, for 1107 /// example: 1108 /// class foo : public bar, virtual private baz { 1109 /// 'public bar' and 'virtual private baz' are each base-specifiers. 1110 BaseResult 1111 Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1112 bool Virtual, AccessSpecifier Access, 1113 ParsedType basetype, SourceLocation BaseLoc, 1114 SourceLocation EllipsisLoc) { 1115 if (!classdecl) 1116 return true; 1117 1118 AdjustDeclIfTemplate(classdecl); 1119 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1120 if (!Class) 1121 return true; 1122 1123 TypeSourceInfo *TInfo = 0; 1124 GetTypeFromParser(basetype, &TInfo); 1125 1126 if (EllipsisLoc.isInvalid() && 1127 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1128 UPPC_BaseType)) 1129 return true; 1130 1131 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1132 Virtual, Access, TInfo, 1133 EllipsisLoc)) 1134 return BaseSpec; 1135 else 1136 Class->setInvalidDecl(); 1137 1138 return true; 1139 } 1140 1141 /// \brief Performs the actual work of attaching the given base class 1142 /// specifiers to a C++ class. 1143 bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1144 unsigned NumBases) { 1145 if (NumBases == 0) 1146 return false; 1147 1148 // Used to keep track of which base types we have already seen, so 1149 // that we can properly diagnose redundant direct base types. Note 1150 // that the key is always the unqualified canonical type of the base 1151 // class. 1152 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1153 1154 // Copy non-redundant base specifiers into permanent storage. 1155 unsigned NumGoodBases = 0; 1156 bool Invalid = false; 1157 for (unsigned idx = 0; idx < NumBases; ++idx) { 1158 QualType NewBaseType 1159 = Context.getCanonicalType(Bases[idx]->getType()); 1160 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1161 1162 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1163 if (KnownBase) { 1164 // C++ [class.mi]p3: 1165 // A class shall not be specified as a direct base class of a 1166 // derived class more than once. 1167 Diag(Bases[idx]->getLocStart(), 1168 diag::err_duplicate_base_class) 1169 << KnownBase->getType() 1170 << Bases[idx]->getSourceRange(); 1171 1172 // Delete the duplicate base class specifier; we're going to 1173 // overwrite its pointer later. 1174 Context.Deallocate(Bases[idx]); 1175 1176 Invalid = true; 1177 } else { 1178 // Okay, add this new base class. 1179 KnownBase = Bases[idx]; 1180 Bases[NumGoodBases++] = Bases[idx]; 1181 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1182 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1183 if (RD->hasAttr<WeakAttr>()) 1184 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1185 } 1186 } 1187 1188 // Attach the remaining base class specifiers to the derived class. 1189 Class->setBases(Bases, NumGoodBases); 1190 1191 // Delete the remaining (good) base class specifiers, since their 1192 // data has been copied into the CXXRecordDecl. 1193 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1194 Context.Deallocate(Bases[idx]); 1195 1196 return Invalid; 1197 } 1198 1199 /// ActOnBaseSpecifiers - Attach the given base specifiers to the 1200 /// class, after checking whether there are any duplicate base 1201 /// classes. 1202 void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1203 unsigned NumBases) { 1204 if (!ClassDecl || !Bases || !NumBases) 1205 return; 1206 1207 AdjustDeclIfTemplate(ClassDecl); 1208 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1209 (CXXBaseSpecifier**)(Bases), NumBases); 1210 } 1211 1212 static CXXRecordDecl *GetClassForType(QualType T) { 1213 if (const RecordType *RT = T->getAs<RecordType>()) 1214 return cast<CXXRecordDecl>(RT->getDecl()); 1215 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1216 return ICT->getDecl(); 1217 else 1218 return 0; 1219 } 1220 1221 /// \brief Determine whether the type \p Derived is a C++ class that is 1222 /// derived from the type \p Base. 1223 bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1224 if (!getLangOpts().CPlusPlus) 1225 return false; 1226 1227 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1228 if (!DerivedRD) 1229 return false; 1230 1231 CXXRecordDecl *BaseRD = GetClassForType(Base); 1232 if (!BaseRD) 1233 return false; 1234 1235 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1236 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1237 } 1238 1239 /// \brief Determine whether the type \p Derived is a C++ class that is 1240 /// derived from the type \p Base. 1241 bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1242 if (!getLangOpts().CPlusPlus) 1243 return false; 1244 1245 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1246 if (!DerivedRD) 1247 return false; 1248 1249 CXXRecordDecl *BaseRD = GetClassForType(Base); 1250 if (!BaseRD) 1251 return false; 1252 1253 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1254 } 1255 1256 void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1257 CXXCastPath &BasePathArray) { 1258 assert(BasePathArray.empty() && "Base path array must be empty!"); 1259 assert(Paths.isRecordingPaths() && "Must record paths!"); 1260 1261 const CXXBasePath &Path = Paths.front(); 1262 1263 // We first go backward and check if we have a virtual base. 1264 // FIXME: It would be better if CXXBasePath had the base specifier for 1265 // the nearest virtual base. 1266 unsigned Start = 0; 1267 for (unsigned I = Path.size(); I != 0; --I) { 1268 if (Path[I - 1].Base->isVirtual()) { 1269 Start = I - 1; 1270 break; 1271 } 1272 } 1273 1274 // Now add all bases. 1275 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1276 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1277 } 1278 1279 /// \brief Determine whether the given base path includes a virtual 1280 /// base class. 1281 bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1282 for (CXXCastPath::const_iterator B = BasePath.begin(), 1283 BEnd = BasePath.end(); 1284 B != BEnd; ++B) 1285 if ((*B)->isVirtual()) 1286 return true; 1287 1288 return false; 1289 } 1290 1291 /// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1292 /// conversion (where Derived and Base are class types) is 1293 /// well-formed, meaning that the conversion is unambiguous (and 1294 /// that all of the base classes are accessible). Returns true 1295 /// and emits a diagnostic if the code is ill-formed, returns false 1296 /// otherwise. Loc is the location where this routine should point to 1297 /// if there is an error, and Range is the source range to highlight 1298 /// if there is an error. 1299 bool 1300 Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1301 unsigned InaccessibleBaseID, 1302 unsigned AmbigiousBaseConvID, 1303 SourceLocation Loc, SourceRange Range, 1304 DeclarationName Name, 1305 CXXCastPath *BasePath) { 1306 // First, determine whether the path from Derived to Base is 1307 // ambiguous. This is slightly more expensive than checking whether 1308 // the Derived to Base conversion exists, because here we need to 1309 // explore multiple paths to determine if there is an ambiguity. 1310 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1311 /*DetectVirtual=*/false); 1312 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1313 assert(DerivationOkay && 1314 "Can only be used with a derived-to-base conversion"); 1315 (void)DerivationOkay; 1316 1317 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1318 if (InaccessibleBaseID) { 1319 // Check that the base class can be accessed. 1320 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1321 InaccessibleBaseID)) { 1322 case AR_inaccessible: 1323 return true; 1324 case AR_accessible: 1325 case AR_dependent: 1326 case AR_delayed: 1327 break; 1328 } 1329 } 1330 1331 // Build a base path if necessary. 1332 if (BasePath) 1333 BuildBasePathArray(Paths, *BasePath); 1334 return false; 1335 } 1336 1337 // We know that the derived-to-base conversion is ambiguous, and 1338 // we're going to produce a diagnostic. Perform the derived-to-base 1339 // search just one more time to compute all of the possible paths so 1340 // that we can print them out. This is more expensive than any of 1341 // the previous derived-to-base checks we've done, but at this point 1342 // performance isn't as much of an issue. 1343 Paths.clear(); 1344 Paths.setRecordingPaths(true); 1345 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1346 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1347 (void)StillOkay; 1348 1349 // Build up a textual representation of the ambiguous paths, e.g., 1350 // D -> B -> A, that will be used to illustrate the ambiguous 1351 // conversions in the diagnostic. We only print one of the paths 1352 // to each base class subobject. 1353 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1354 1355 Diag(Loc, AmbigiousBaseConvID) 1356 << Derived << Base << PathDisplayStr << Range << Name; 1357 return true; 1358 } 1359 1360 bool 1361 Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1362 SourceLocation Loc, SourceRange Range, 1363 CXXCastPath *BasePath, 1364 bool IgnoreAccess) { 1365 return CheckDerivedToBaseConversion(Derived, Base, 1366 IgnoreAccess ? 0 1367 : diag::err_upcast_to_inaccessible_base, 1368 diag::err_ambiguous_derived_to_base_conv, 1369 Loc, Range, DeclarationName(), 1370 BasePath); 1371 } 1372 1373 1374 /// @brief Builds a string representing ambiguous paths from a 1375 /// specific derived class to different subobjects of the same base 1376 /// class. 1377 /// 1378 /// This function builds a string that can be used in error messages 1379 /// to show the different paths that one can take through the 1380 /// inheritance hierarchy to go from the derived class to different 1381 /// subobjects of a base class. The result looks something like this: 1382 /// @code 1383 /// struct D -> struct B -> struct A 1384 /// struct D -> struct C -> struct A 1385 /// @endcode 1386 std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1387 std::string PathDisplayStr; 1388 std::set<unsigned> DisplayedPaths; 1389 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1390 Path != Paths.end(); ++Path) { 1391 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1392 // We haven't displayed a path to this particular base 1393 // class subobject yet. 1394 PathDisplayStr += "\n "; 1395 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1396 for (CXXBasePath::const_iterator Element = Path->begin(); 1397 Element != Path->end(); ++Element) 1398 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1399 } 1400 } 1401 1402 return PathDisplayStr; 1403 } 1404 1405 //===----------------------------------------------------------------------===// 1406 // C++ class member Handling 1407 //===----------------------------------------------------------------------===// 1408 1409 /// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1410 bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1411 SourceLocation ASLoc, 1412 SourceLocation ColonLoc, 1413 AttributeList *Attrs) { 1414 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1415 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1416 ASLoc, ColonLoc); 1417 CurContext->addHiddenDecl(ASDecl); 1418 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1419 } 1420 1421 /// CheckOverrideControl - Check C++11 override control semantics. 1422 void Sema::CheckOverrideControl(Decl *D) { 1423 if (D->isInvalidDecl()) 1424 return; 1425 1426 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1427 1428 // Do we know which functions this declaration might be overriding? 1429 bool OverridesAreKnown = !MD || 1430 (!MD->getParent()->hasAnyDependentBases() && 1431 !MD->getType()->isDependentType()); 1432 1433 if (!MD || !MD->isVirtual()) { 1434 if (OverridesAreKnown) { 1435 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1436 Diag(OA->getLocation(), 1437 diag::override_keyword_only_allowed_on_virtual_member_functions) 1438 << "override" << FixItHint::CreateRemoval(OA->getLocation()); 1439 D->dropAttr<OverrideAttr>(); 1440 } 1441 if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1442 Diag(FA->getLocation(), 1443 diag::override_keyword_only_allowed_on_virtual_member_functions) 1444 << "final" << FixItHint::CreateRemoval(FA->getLocation()); 1445 D->dropAttr<FinalAttr>(); 1446 } 1447 } 1448 return; 1449 } 1450 1451 if (!OverridesAreKnown) 1452 return; 1453 1454 // C++11 [class.virtual]p5: 1455 // If a virtual function is marked with the virt-specifier override and 1456 // does not override a member function of a base class, the program is 1457 // ill-formed. 1458 bool HasOverriddenMethods = 1459 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1460 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) 1461 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) 1462 << MD->getDeclName(); 1463 } 1464 1465 /// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1466 /// function overrides a virtual member function marked 'final', according to 1467 /// C++11 [class.virtual]p4. 1468 bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1469 const CXXMethodDecl *Old) { 1470 if (!Old->hasAttr<FinalAttr>()) 1471 return false; 1472 1473 Diag(New->getLocation(), diag::err_final_function_overridden) 1474 << New->getDeclName(); 1475 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1476 return true; 1477 } 1478 1479 static bool InitializationHasSideEffects(const FieldDecl &FD) { 1480 const Type *T = FD.getType()->getBaseElementTypeUnsafe(); 1481 // FIXME: Destruction of ObjC lifetime types has side-effects. 1482 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) 1483 return !RD->isCompleteDefinition() || 1484 !RD->hasTrivialDefaultConstructor() || 1485 !RD->hasTrivialDestructor(); 1486 return false; 1487 } 1488 1489 /// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1490 /// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1491 /// bitfield width if there is one, 'InitExpr' specifies the initializer if 1492 /// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1493 /// present (but parsing it has been deferred). 1494 Decl * 1495 Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1496 MultiTemplateParamsArg TemplateParameterLists, 1497 Expr *BW, const VirtSpecifiers &VS, 1498 InClassInitStyle InitStyle) { 1499 const DeclSpec &DS = D.getDeclSpec(); 1500 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1501 DeclarationName Name = NameInfo.getName(); 1502 SourceLocation Loc = NameInfo.getLoc(); 1503 1504 // For anonymous bitfields, the location should point to the type. 1505 if (Loc.isInvalid()) 1506 Loc = D.getLocStart(); 1507 1508 Expr *BitWidth = static_cast<Expr*>(BW); 1509 1510 assert(isa<CXXRecordDecl>(CurContext)); 1511 assert(!DS.isFriendSpecified()); 1512 1513 bool isFunc = D.isDeclarationOfFunction(); 1514 1515 // C++ 9.2p6: A member shall not be declared to have automatic storage 1516 // duration (auto, register) or with the extern storage-class-specifier. 1517 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1518 // data members and cannot be applied to names declared const or static, 1519 // and cannot be applied to reference members. 1520 switch (DS.getStorageClassSpec()) { 1521 case DeclSpec::SCS_unspecified: 1522 case DeclSpec::SCS_typedef: 1523 case DeclSpec::SCS_static: 1524 // FALL THROUGH. 1525 break; 1526 case DeclSpec::SCS_mutable: 1527 if (isFunc) { 1528 if (DS.getStorageClassSpecLoc().isValid()) 1529 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1530 else 1531 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1532 1533 // FIXME: It would be nicer if the keyword was ignored only for this 1534 // declarator. Otherwise we could get follow-up errors. 1535 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1536 } 1537 break; 1538 default: 1539 if (DS.getStorageClassSpecLoc().isValid()) 1540 Diag(DS.getStorageClassSpecLoc(), 1541 diag::err_storageclass_invalid_for_member); 1542 else 1543 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1544 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1545 } 1546 1547 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1548 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1549 !isFunc); 1550 1551 Decl *Member; 1552 if (isInstField) { 1553 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1554 1555 // Data members must have identifiers for names. 1556 if (!Name.isIdentifier()) { 1557 Diag(Loc, diag::err_bad_variable_name) 1558 << Name; 1559 return 0; 1560 } 1561 1562 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1563 1564 // Member field could not be with "template" keyword. 1565 // So TemplateParameterLists should be empty in this case. 1566 if (TemplateParameterLists.size()) { 1567 TemplateParameterList* TemplateParams = TemplateParameterLists[0]; 1568 if (TemplateParams->size()) { 1569 // There is no such thing as a member field template. 1570 Diag(D.getIdentifierLoc(), diag::err_template_member) 1571 << II 1572 << SourceRange(TemplateParams->getTemplateLoc(), 1573 TemplateParams->getRAngleLoc()); 1574 } else { 1575 // There is an extraneous 'template<>' for this member. 1576 Diag(TemplateParams->getTemplateLoc(), 1577 diag::err_template_member_noparams) 1578 << II 1579 << SourceRange(TemplateParams->getTemplateLoc(), 1580 TemplateParams->getRAngleLoc()); 1581 } 1582 return 0; 1583 } 1584 1585 if (SS.isSet() && !SS.isInvalid()) { 1586 // The user provided a superfluous scope specifier inside a class 1587 // definition: 1588 // 1589 // class X { 1590 // int X::member; 1591 // }; 1592 if (DeclContext *DC = computeDeclContext(SS, false)) 1593 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1594 else 1595 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1596 << Name << SS.getRange(); 1597 1598 SS.clear(); 1599 } 1600 1601 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1602 InitStyle, AS); 1603 assert(Member && "HandleField never returns null"); 1604 } else { 1605 assert(InitStyle == ICIS_NoInit); 1606 1607 Member = HandleDeclarator(S, D, TemplateParameterLists); 1608 if (!Member) { 1609 return 0; 1610 } 1611 1612 // Non-instance-fields can't have a bitfield. 1613 if (BitWidth) { 1614 if (Member->isInvalidDecl()) { 1615 // don't emit another diagnostic. 1616 } else if (isa<VarDecl>(Member)) { 1617 // C++ 9.6p3: A bit-field shall not be a static member. 1618 // "static member 'A' cannot be a bit-field" 1619 Diag(Loc, diag::err_static_not_bitfield) 1620 << Name << BitWidth->getSourceRange(); 1621 } else if (isa<TypedefDecl>(Member)) { 1622 // "typedef member 'x' cannot be a bit-field" 1623 Diag(Loc, diag::err_typedef_not_bitfield) 1624 << Name << BitWidth->getSourceRange(); 1625 } else { 1626 // A function typedef ("typedef int f(); f a;"). 1627 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1628 Diag(Loc, diag::err_not_integral_type_bitfield) 1629 << Name << cast<ValueDecl>(Member)->getType() 1630 << BitWidth->getSourceRange(); 1631 } 1632 1633 BitWidth = 0; 1634 Member->setInvalidDecl(); 1635 } 1636 1637 Member->setAccess(AS); 1638 1639 // If we have declared a member function template, set the access of the 1640 // templated declaration as well. 1641 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1642 FunTmpl->getTemplatedDecl()->setAccess(AS); 1643 } 1644 1645 if (VS.isOverrideSpecified()) 1646 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1647 if (VS.isFinalSpecified()) 1648 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1649 1650 if (VS.getLastLocation().isValid()) { 1651 // Update the end location of a method that has a virt-specifiers. 1652 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1653 MD->setRangeEnd(VS.getLastLocation()); 1654 } 1655 1656 CheckOverrideControl(Member); 1657 1658 assert((Name || isInstField) && "No identifier for non-field ?"); 1659 1660 if (isInstField) { 1661 FieldDecl *FD = cast<FieldDecl>(Member); 1662 FieldCollector->Add(FD); 1663 1664 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 1665 FD->getLocation()) 1666 != DiagnosticsEngine::Ignored) { 1667 // Remember all explicit private FieldDecls that have a name, no side 1668 // effects and are not part of a dependent type declaration. 1669 if (!FD->isImplicit() && FD->getDeclName() && 1670 FD->getAccess() == AS_private && 1671 !FD->hasAttr<UnusedAttr>() && 1672 !FD->getParent()->isDependentContext() && 1673 !InitializationHasSideEffects(*FD)) 1674 UnusedPrivateFields.insert(FD); 1675 } 1676 } 1677 1678 return Member; 1679 } 1680 1681 /// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1682 /// in-class initializer for a non-static C++ class member, and after 1683 /// instantiating an in-class initializer in a class template. Such actions 1684 /// are deferred until the class is complete. 1685 void 1686 Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 1687 Expr *InitExpr) { 1688 FieldDecl *FD = cast<FieldDecl>(D); 1689 assert(FD->getInClassInitStyle() != ICIS_NoInit && 1690 "must set init style when field is created"); 1691 1692 if (!InitExpr) { 1693 FD->setInvalidDecl(); 1694 FD->removeInClassInitializer(); 1695 return; 1696 } 1697 1698 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1699 FD->setInvalidDecl(); 1700 FD->removeInClassInitializer(); 1701 return; 1702 } 1703 1704 ExprResult Init = InitExpr; 1705 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1706 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1707 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1708 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1709 } 1710 Expr **Inits = &InitExpr; 1711 unsigned NumInits = 1; 1712 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1713 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 1714 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1715 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 1716 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 1717 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 1718 if (Init.isInvalid()) { 1719 FD->setInvalidDecl(); 1720 return; 1721 } 1722 1723 CheckImplicitConversions(Init.get(), InitLoc); 1724 } 1725 1726 // C++0x [class.base.init]p7: 1727 // The initialization of each base and member constitutes a 1728 // full-expression. 1729 Init = MaybeCreateExprWithCleanups(Init); 1730 if (Init.isInvalid()) { 1731 FD->setInvalidDecl(); 1732 return; 1733 } 1734 1735 InitExpr = Init.release(); 1736 1737 FD->setInClassInitializer(InitExpr); 1738 } 1739 1740 /// \brief Find the direct and/or virtual base specifiers that 1741 /// correspond to the given base type, for use in base initialization 1742 /// within a constructor. 1743 static bool FindBaseInitializer(Sema &SemaRef, 1744 CXXRecordDecl *ClassDecl, 1745 QualType BaseType, 1746 const CXXBaseSpecifier *&DirectBaseSpec, 1747 const CXXBaseSpecifier *&VirtualBaseSpec) { 1748 // First, check for a direct base class. 1749 DirectBaseSpec = 0; 1750 for (CXXRecordDecl::base_class_const_iterator Base 1751 = ClassDecl->bases_begin(); 1752 Base != ClassDecl->bases_end(); ++Base) { 1753 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1754 // We found a direct base of this type. That's what we're 1755 // initializing. 1756 DirectBaseSpec = &*Base; 1757 break; 1758 } 1759 } 1760 1761 // Check for a virtual base class. 1762 // FIXME: We might be able to short-circuit this if we know in advance that 1763 // there are no virtual bases. 1764 VirtualBaseSpec = 0; 1765 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1766 // We haven't found a base yet; search the class hierarchy for a 1767 // virtual base class. 1768 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1769 /*DetectVirtual=*/false); 1770 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1771 BaseType, Paths)) { 1772 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1773 Path != Paths.end(); ++Path) { 1774 if (Path->back().Base->isVirtual()) { 1775 VirtualBaseSpec = Path->back().Base; 1776 break; 1777 } 1778 } 1779 } 1780 } 1781 1782 return DirectBaseSpec || VirtualBaseSpec; 1783 } 1784 1785 /// \brief Handle a C++ member initializer using braced-init-list syntax. 1786 MemInitResult 1787 Sema::ActOnMemInitializer(Decl *ConstructorD, 1788 Scope *S, 1789 CXXScopeSpec &SS, 1790 IdentifierInfo *MemberOrBase, 1791 ParsedType TemplateTypeTy, 1792 const DeclSpec &DS, 1793 SourceLocation IdLoc, 1794 Expr *InitList, 1795 SourceLocation EllipsisLoc) { 1796 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1797 DS, IdLoc, InitList, 1798 EllipsisLoc); 1799 } 1800 1801 /// \brief Handle a C++ member initializer using parentheses syntax. 1802 MemInitResult 1803 Sema::ActOnMemInitializer(Decl *ConstructorD, 1804 Scope *S, 1805 CXXScopeSpec &SS, 1806 IdentifierInfo *MemberOrBase, 1807 ParsedType TemplateTypeTy, 1808 const DeclSpec &DS, 1809 SourceLocation IdLoc, 1810 SourceLocation LParenLoc, 1811 Expr **Args, unsigned NumArgs, 1812 SourceLocation RParenLoc, 1813 SourceLocation EllipsisLoc) { 1814 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, 1815 llvm::makeArrayRef(Args, NumArgs), 1816 RParenLoc); 1817 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1818 DS, IdLoc, List, EllipsisLoc); 1819 } 1820 1821 namespace { 1822 1823 // Callback to only accept typo corrections that can be a valid C++ member 1824 // intializer: either a non-static field member or a base class. 1825 class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1826 public: 1827 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1828 : ClassDecl(ClassDecl) {} 1829 1830 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1831 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1832 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1833 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1834 else 1835 return isa<TypeDecl>(ND); 1836 } 1837 return false; 1838 } 1839 1840 private: 1841 CXXRecordDecl *ClassDecl; 1842 }; 1843 1844 } 1845 1846 /// \brief Handle a C++ member initializer. 1847 MemInitResult 1848 Sema::BuildMemInitializer(Decl *ConstructorD, 1849 Scope *S, 1850 CXXScopeSpec &SS, 1851 IdentifierInfo *MemberOrBase, 1852 ParsedType TemplateTypeTy, 1853 const DeclSpec &DS, 1854 SourceLocation IdLoc, 1855 Expr *Init, 1856 SourceLocation EllipsisLoc) { 1857 if (!ConstructorD) 1858 return true; 1859 1860 AdjustDeclIfTemplate(ConstructorD); 1861 1862 CXXConstructorDecl *Constructor 1863 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1864 if (!Constructor) { 1865 // The user wrote a constructor initializer on a function that is 1866 // not a C++ constructor. Ignore the error for now, because we may 1867 // have more member initializers coming; we'll diagnose it just 1868 // once in ActOnMemInitializers. 1869 return true; 1870 } 1871 1872 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1873 1874 // C++ [class.base.init]p2: 1875 // Names in a mem-initializer-id are looked up in the scope of the 1876 // constructor's class and, if not found in that scope, are looked 1877 // up in the scope containing the constructor's definition. 1878 // [Note: if the constructor's class contains a member with the 1879 // same name as a direct or virtual base class of the class, a 1880 // mem-initializer-id naming the member or base class and composed 1881 // of a single identifier refers to the class member. A 1882 // mem-initializer-id for the hidden base class may be specified 1883 // using a qualified name. ] 1884 if (!SS.getScopeRep() && !TemplateTypeTy) { 1885 // Look for a member, first. 1886 DeclContext::lookup_result Result 1887 = ClassDecl->lookup(MemberOrBase); 1888 if (Result.first != Result.second) { 1889 ValueDecl *Member; 1890 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1891 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1892 if (EllipsisLoc.isValid()) 1893 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1894 << MemberOrBase 1895 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 1896 1897 return BuildMemberInitializer(Member, Init, IdLoc); 1898 } 1899 } 1900 } 1901 // It didn't name a member, so see if it names a class. 1902 QualType BaseType; 1903 TypeSourceInfo *TInfo = 0; 1904 1905 if (TemplateTypeTy) { 1906 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1907 } else if (DS.getTypeSpecType() == TST_decltype) { 1908 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 1909 } else { 1910 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1911 LookupParsedName(R, S, &SS); 1912 1913 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1914 if (!TyD) { 1915 if (R.isAmbiguous()) return true; 1916 1917 // We don't want access-control diagnostics here. 1918 R.suppressDiagnostics(); 1919 1920 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1921 bool NotUnknownSpecialization = false; 1922 DeclContext *DC = computeDeclContext(SS, false); 1923 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1924 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1925 1926 if (!NotUnknownSpecialization) { 1927 // When the scope specifier can refer to a member of an unknown 1928 // specialization, we take it as a type name. 1929 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1930 SS.getWithLocInContext(Context), 1931 *MemberOrBase, IdLoc); 1932 if (BaseType.isNull()) 1933 return true; 1934 1935 R.clear(); 1936 R.setLookupName(MemberOrBase); 1937 } 1938 } 1939 1940 // If no results were found, try to correct typos. 1941 TypoCorrection Corr; 1942 MemInitializerValidatorCCC Validator(ClassDecl); 1943 if (R.empty() && BaseType.isNull() && 1944 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1945 Validator, ClassDecl))) { 1946 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 1947 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 1948 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1949 // We have found a non-static data member with a similar 1950 // name to what was typed; complain and initialize that 1951 // member. 1952 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1953 << MemberOrBase << true << CorrectedQuotedStr 1954 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1955 Diag(Member->getLocation(), diag::note_previous_decl) 1956 << CorrectedQuotedStr; 1957 1958 return BuildMemberInitializer(Member, Init, IdLoc); 1959 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1960 const CXXBaseSpecifier *DirectBaseSpec; 1961 const CXXBaseSpecifier *VirtualBaseSpec; 1962 if (FindBaseInitializer(*this, ClassDecl, 1963 Context.getTypeDeclType(Type), 1964 DirectBaseSpec, VirtualBaseSpec)) { 1965 // We have found a direct or virtual base class with a 1966 // similar name to what was typed; complain and initialize 1967 // that base class. 1968 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1969 << MemberOrBase << false << CorrectedQuotedStr 1970 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1971 1972 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1973 : VirtualBaseSpec; 1974 Diag(BaseSpec->getLocStart(), 1975 diag::note_base_class_specified_here) 1976 << BaseSpec->getType() 1977 << BaseSpec->getSourceRange(); 1978 1979 TyD = Type; 1980 } 1981 } 1982 } 1983 1984 if (!TyD && BaseType.isNull()) { 1985 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1986 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 1987 return true; 1988 } 1989 } 1990 1991 if (BaseType.isNull()) { 1992 BaseType = Context.getTypeDeclType(TyD); 1993 if (SS.isSet()) { 1994 NestedNameSpecifier *Qualifier = 1995 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1996 1997 // FIXME: preserve source range information 1998 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1999 } 2000 } 2001 } 2002 2003 if (!TInfo) 2004 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 2005 2006 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 2007 } 2008 2009 /// Checks a member initializer expression for cases where reference (or 2010 /// pointer) members are bound to by-value parameters (or their addresses). 2011 static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 2012 Expr *Init, 2013 SourceLocation IdLoc) { 2014 QualType MemberTy = Member->getType(); 2015 2016 // We only handle pointers and references currently. 2017 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 2018 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 2019 return; 2020 2021 const bool IsPointer = MemberTy->isPointerType(); 2022 if (IsPointer) { 2023 if (const UnaryOperator *Op 2024 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2025 // The only case we're worried about with pointers requires taking the 2026 // address. 2027 if (Op->getOpcode() != UO_AddrOf) 2028 return; 2029 2030 Init = Op->getSubExpr(); 2031 } else { 2032 // We only handle address-of expression initializers for pointers. 2033 return; 2034 } 2035 } 2036 2037 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 2038 // Taking the address of a temporary will be diagnosed as a hard error. 2039 if (IsPointer) 2040 return; 2041 2042 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 2043 << Member << Init->getSourceRange(); 2044 } else if (const DeclRefExpr *DRE 2045 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2046 // We only warn when referring to a non-reference parameter declaration. 2047 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2048 if (!Parameter || Parameter->getType()->isReferenceType()) 2049 return; 2050 2051 S.Diag(Init->getExprLoc(), 2052 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2053 : diag::warn_bind_ref_member_to_parameter) 2054 << Member << Parameter << Init->getSourceRange(); 2055 } else { 2056 // Other initializers are fine. 2057 return; 2058 } 2059 2060 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2061 << (unsigned)IsPointer; 2062 } 2063 2064 namespace { 2065 class UninitializedFieldVisitor 2066 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 2067 Sema &S; 2068 ValueDecl *VD; 2069 public: 2070 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 2071 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context), 2072 S(S), VD(VD) { 2073 } 2074 2075 void HandleExpr(Expr *E) { 2076 if (!E) return; 2077 2078 // Expressions like x(x) sometimes lack the surrounding expressions 2079 // but need to be checked anyways. 2080 HandleValue(E); 2081 Visit(E); 2082 } 2083 2084 void HandleValue(Expr *E) { 2085 E = E->IgnoreParens(); 2086 2087 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 2088 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 2089 return; 2090 Expr *Base = E; 2091 while (isa<MemberExpr>(Base)) { 2092 ME = dyn_cast<MemberExpr>(Base); 2093 if (VarDecl *VarD = dyn_cast<VarDecl>(ME->getMemberDecl())) 2094 if (VarD->hasGlobalStorage()) 2095 return; 2096 Base = ME->getBase(); 2097 } 2098 2099 if (VD == ME->getMemberDecl() && isa<CXXThisExpr>(Base)) { 2100 unsigned diag = VD->getType()->isReferenceType() 2101 ? diag::warn_reference_field_is_uninit 2102 : diag::warn_field_is_uninit; 2103 S.Diag(ME->getExprLoc(), diag); 2104 return; 2105 } 2106 } 2107 2108 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 2109 HandleValue(CO->getTrueExpr()); 2110 HandleValue(CO->getFalseExpr()); 2111 return; 2112 } 2113 2114 if (BinaryConditionalOperator *BCO = 2115 dyn_cast<BinaryConditionalOperator>(E)) { 2116 HandleValue(BCO->getCommon()); 2117 HandleValue(BCO->getFalseExpr()); 2118 return; 2119 } 2120 2121 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2122 switch (BO->getOpcode()) { 2123 default: 2124 return; 2125 case(BO_PtrMemD): 2126 case(BO_PtrMemI): 2127 HandleValue(BO->getLHS()); 2128 return; 2129 case(BO_Comma): 2130 HandleValue(BO->getRHS()); 2131 return; 2132 } 2133 } 2134 } 2135 2136 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 2137 if (E->getCastKind() == CK_LValueToRValue) 2138 HandleValue(E->getSubExpr()); 2139 2140 Inherited::VisitImplicitCastExpr(E); 2141 } 2142 2143 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 2144 Expr *Callee = E->getCallee(); 2145 if (isa<MemberExpr>(Callee)) 2146 HandleValue(Callee); 2147 2148 Inherited::VisitCXXMemberCallExpr(E); 2149 } 2150 }; 2151 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E, 2152 ValueDecl *VD) { 2153 UninitializedFieldVisitor(S, VD).HandleExpr(E); 2154 } 2155 } // namespace 2156 2157 MemInitResult 2158 Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2159 SourceLocation IdLoc) { 2160 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2161 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2162 assert((DirectMember || IndirectMember) && 2163 "Member must be a FieldDecl or IndirectFieldDecl"); 2164 2165 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2166 return true; 2167 2168 if (Member->isInvalidDecl()) 2169 return true; 2170 2171 // Diagnose value-uses of fields to initialize themselves, e.g. 2172 // foo(foo) 2173 // where foo is not also a parameter to the constructor. 2174 // TODO: implement -Wuninitialized and fold this into that framework. 2175 Expr **Args; 2176 unsigned NumArgs; 2177 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2178 Args = ParenList->getExprs(); 2179 NumArgs = ParenList->getNumExprs(); 2180 } else { 2181 InitListExpr *InitList = cast<InitListExpr>(Init); 2182 Args = InitList->getInits(); 2183 NumArgs = InitList->getNumInits(); 2184 } 2185 2186 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc) 2187 != DiagnosticsEngine::Ignored) 2188 for (unsigned i = 0; i < NumArgs; ++i) 2189 // FIXME: Warn about the case when other fields are used before being 2190 // uninitialized. For example, let this field be the i'th field. When 2191 // initializing the i'th field, throw a warning if any of the >= i'th 2192 // fields are used, as they are not yet initialized. 2193 // Right now we are only handling the case where the i'th field uses 2194 // itself in its initializer. 2195 CheckInitExprContainsUninitializedFields(*this, Args[i], Member); 2196 2197 SourceRange InitRange = Init->getSourceRange(); 2198 2199 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2200 // Can't check initialization for a member of dependent type or when 2201 // any of the arguments are type-dependent expressions. 2202 DiscardCleanupsInEvaluationContext(); 2203 } else { 2204 bool InitList = false; 2205 if (isa<InitListExpr>(Init)) { 2206 InitList = true; 2207 Args = &Init; 2208 NumArgs = 1; 2209 2210 if (isStdInitializerList(Member->getType(), 0)) { 2211 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2212 << /*at end of ctor*/1 << InitRange; 2213 } 2214 } 2215 2216 // Initialize the member. 2217 InitializedEntity MemberEntity = 2218 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2219 : InitializedEntity::InitializeMember(IndirectMember, 0); 2220 InitializationKind Kind = 2221 InitList ? InitializationKind::CreateDirectList(IdLoc) 2222 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2223 InitRange.getEnd()); 2224 2225 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2226 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2227 MultiExprArg(Args, NumArgs), 2228 0); 2229 if (MemberInit.isInvalid()) 2230 return true; 2231 2232 CheckImplicitConversions(MemberInit.get(), 2233 InitRange.getBegin()); 2234 2235 // C++0x [class.base.init]p7: 2236 // The initialization of each base and member constitutes a 2237 // full-expression. 2238 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2239 if (MemberInit.isInvalid()) 2240 return true; 2241 2242 // If we are in a dependent context, template instantiation will 2243 // perform this type-checking again. Just save the arguments that we 2244 // received. 2245 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2246 // of the information that we have about the member 2247 // initializer. However, deconstructing the ASTs is a dicey process, 2248 // and this approach is far more likely to get the corner cases right. 2249 if (CurContext->isDependentContext()) { 2250 // The existing Init will do fine. 2251 } else { 2252 Init = MemberInit.get(); 2253 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2254 } 2255 } 2256 2257 if (DirectMember) { 2258 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2259 InitRange.getBegin(), Init, 2260 InitRange.getEnd()); 2261 } else { 2262 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2263 InitRange.getBegin(), Init, 2264 InitRange.getEnd()); 2265 } 2266 } 2267 2268 MemInitResult 2269 Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2270 CXXRecordDecl *ClassDecl) { 2271 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2272 if (!LangOpts.CPlusPlus0x) 2273 return Diag(NameLoc, diag::err_delegating_ctor) 2274 << TInfo->getTypeLoc().getLocalSourceRange(); 2275 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2276 2277 bool InitList = true; 2278 Expr **Args = &Init; 2279 unsigned NumArgs = 1; 2280 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2281 InitList = false; 2282 Args = ParenList->getExprs(); 2283 NumArgs = ParenList->getNumExprs(); 2284 } 2285 2286 SourceRange InitRange = Init->getSourceRange(); 2287 // Initialize the object. 2288 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2289 QualType(ClassDecl->getTypeForDecl(), 0)); 2290 InitializationKind Kind = 2291 InitList ? InitializationKind::CreateDirectList(NameLoc) 2292 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2293 InitRange.getEnd()); 2294 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2295 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2296 MultiExprArg(Args, NumArgs), 2297 0); 2298 if (DelegationInit.isInvalid()) 2299 return true; 2300 2301 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2302 "Delegating constructor with no target?"); 2303 2304 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2305 2306 // C++0x [class.base.init]p7: 2307 // The initialization of each base and member constitutes a 2308 // full-expression. 2309 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2310 if (DelegationInit.isInvalid()) 2311 return true; 2312 2313 // If we are in a dependent context, template instantiation will 2314 // perform this type-checking again. Just save the arguments that we 2315 // received in a ParenListExpr. 2316 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2317 // of the information that we have about the base 2318 // initializer. However, deconstructing the ASTs is a dicey process, 2319 // and this approach is far more likely to get the corner cases right. 2320 if (CurContext->isDependentContext()) 2321 DelegationInit = Owned(Init); 2322 2323 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2324 DelegationInit.takeAs<Expr>(), 2325 InitRange.getEnd()); 2326 } 2327 2328 MemInitResult 2329 Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2330 Expr *Init, CXXRecordDecl *ClassDecl, 2331 SourceLocation EllipsisLoc) { 2332 SourceLocation BaseLoc 2333 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2334 2335 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2336 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2337 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2338 2339 // C++ [class.base.init]p2: 2340 // [...] Unless the mem-initializer-id names a nonstatic data 2341 // member of the constructor's class or a direct or virtual base 2342 // of that class, the mem-initializer is ill-formed. A 2343 // mem-initializer-list can initialize a base class using any 2344 // name that denotes that base class type. 2345 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2346 2347 SourceRange InitRange = Init->getSourceRange(); 2348 if (EllipsisLoc.isValid()) { 2349 // This is a pack expansion. 2350 if (!BaseType->containsUnexpandedParameterPack()) { 2351 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2352 << SourceRange(BaseLoc, InitRange.getEnd()); 2353 2354 EllipsisLoc = SourceLocation(); 2355 } 2356 } else { 2357 // Check for any unexpanded parameter packs. 2358 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2359 return true; 2360 2361 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2362 return true; 2363 } 2364 2365 // Check for direct and virtual base classes. 2366 const CXXBaseSpecifier *DirectBaseSpec = 0; 2367 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2368 if (!Dependent) { 2369 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2370 BaseType)) 2371 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2372 2373 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2374 VirtualBaseSpec); 2375 2376 // C++ [base.class.init]p2: 2377 // Unless the mem-initializer-id names a nonstatic data member of the 2378 // constructor's class or a direct or virtual base of that class, the 2379 // mem-initializer is ill-formed. 2380 if (!DirectBaseSpec && !VirtualBaseSpec) { 2381 // If the class has any dependent bases, then it's possible that 2382 // one of those types will resolve to the same type as 2383 // BaseType. Therefore, just treat this as a dependent base 2384 // class initialization. FIXME: Should we try to check the 2385 // initialization anyway? It seems odd. 2386 if (ClassDecl->hasAnyDependentBases()) 2387 Dependent = true; 2388 else 2389 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2390 << BaseType << Context.getTypeDeclType(ClassDecl) 2391 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2392 } 2393 } 2394 2395 if (Dependent) { 2396 DiscardCleanupsInEvaluationContext(); 2397 2398 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2399 /*IsVirtual=*/false, 2400 InitRange.getBegin(), Init, 2401 InitRange.getEnd(), EllipsisLoc); 2402 } 2403 2404 // C++ [base.class.init]p2: 2405 // If a mem-initializer-id is ambiguous because it designates both 2406 // a direct non-virtual base class and an inherited virtual base 2407 // class, the mem-initializer is ill-formed. 2408 if (DirectBaseSpec && VirtualBaseSpec) 2409 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2410 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2411 2412 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2413 if (!BaseSpec) 2414 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2415 2416 // Initialize the base. 2417 bool InitList = true; 2418 Expr **Args = &Init; 2419 unsigned NumArgs = 1; 2420 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2421 InitList = false; 2422 Args = ParenList->getExprs(); 2423 NumArgs = ParenList->getNumExprs(); 2424 } 2425 2426 InitializedEntity BaseEntity = 2427 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2428 InitializationKind Kind = 2429 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2430 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2431 InitRange.getEnd()); 2432 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2433 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2434 MultiExprArg(Args, NumArgs), 0); 2435 if (BaseInit.isInvalid()) 2436 return true; 2437 2438 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2439 2440 // C++0x [class.base.init]p7: 2441 // The initialization of each base and member constitutes a 2442 // full-expression. 2443 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2444 if (BaseInit.isInvalid()) 2445 return true; 2446 2447 // If we are in a dependent context, template instantiation will 2448 // perform this type-checking again. Just save the arguments that we 2449 // received in a ParenListExpr. 2450 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2451 // of the information that we have about the base 2452 // initializer. However, deconstructing the ASTs is a dicey process, 2453 // and this approach is far more likely to get the corner cases right. 2454 if (CurContext->isDependentContext()) 2455 BaseInit = Owned(Init); 2456 2457 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2458 BaseSpec->isVirtual(), 2459 InitRange.getBegin(), 2460 BaseInit.takeAs<Expr>(), 2461 InitRange.getEnd(), EllipsisLoc); 2462 } 2463 2464 // Create a static_cast\<T&&>(expr). 2465 static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2466 QualType ExprType = E->getType(); 2467 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2468 SourceLocation ExprLoc = E->getLocStart(); 2469 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2470 TargetType, ExprLoc); 2471 2472 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2473 SourceRange(ExprLoc, ExprLoc), 2474 E->getSourceRange()).take(); 2475 } 2476 2477 /// ImplicitInitializerKind - How an implicit base or member initializer should 2478 /// initialize its base or member. 2479 enum ImplicitInitializerKind { 2480 IIK_Default, 2481 IIK_Copy, 2482 IIK_Move 2483 }; 2484 2485 static bool 2486 BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2487 ImplicitInitializerKind ImplicitInitKind, 2488 CXXBaseSpecifier *BaseSpec, 2489 bool IsInheritedVirtualBase, 2490 CXXCtorInitializer *&CXXBaseInit) { 2491 InitializedEntity InitEntity 2492 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2493 IsInheritedVirtualBase); 2494 2495 ExprResult BaseInit; 2496 2497 switch (ImplicitInitKind) { 2498 case IIK_Default: { 2499 InitializationKind InitKind 2500 = InitializationKind::CreateDefault(Constructor->getLocation()); 2501 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2502 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2503 break; 2504 } 2505 2506 case IIK_Move: 2507 case IIK_Copy: { 2508 bool Moving = ImplicitInitKind == IIK_Move; 2509 ParmVarDecl *Param = Constructor->getParamDecl(0); 2510 QualType ParamType = Param->getType().getNonReferenceType(); 2511 2512 Expr *CopyCtorArg = 2513 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2514 SourceLocation(), Param, false, 2515 Constructor->getLocation(), ParamType, 2516 VK_LValue, 0); 2517 2518 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2519 2520 // Cast to the base class to avoid ambiguities. 2521 QualType ArgTy = 2522 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2523 ParamType.getQualifiers()); 2524 2525 if (Moving) { 2526 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2527 } 2528 2529 CXXCastPath BasePath; 2530 BasePath.push_back(BaseSpec); 2531 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2532 CK_UncheckedDerivedToBase, 2533 Moving ? VK_XValue : VK_LValue, 2534 &BasePath).take(); 2535 2536 InitializationKind InitKind 2537 = InitializationKind::CreateDirect(Constructor->getLocation(), 2538 SourceLocation(), SourceLocation()); 2539 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2540 &CopyCtorArg, 1); 2541 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2542 MultiExprArg(&CopyCtorArg, 1)); 2543 break; 2544 } 2545 } 2546 2547 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2548 if (BaseInit.isInvalid()) 2549 return true; 2550 2551 CXXBaseInit = 2552 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2553 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2554 SourceLocation()), 2555 BaseSpec->isVirtual(), 2556 SourceLocation(), 2557 BaseInit.takeAs<Expr>(), 2558 SourceLocation(), 2559 SourceLocation()); 2560 2561 return false; 2562 } 2563 2564 static bool RefersToRValueRef(Expr *MemRef) { 2565 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2566 return Referenced->getType()->isRValueReferenceType(); 2567 } 2568 2569 static bool 2570 BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2571 ImplicitInitializerKind ImplicitInitKind, 2572 FieldDecl *Field, IndirectFieldDecl *Indirect, 2573 CXXCtorInitializer *&CXXMemberInit) { 2574 if (Field->isInvalidDecl()) 2575 return true; 2576 2577 SourceLocation Loc = Constructor->getLocation(); 2578 2579 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2580 bool Moving = ImplicitInitKind == IIK_Move; 2581 ParmVarDecl *Param = Constructor->getParamDecl(0); 2582 QualType ParamType = Param->getType().getNonReferenceType(); 2583 2584 // Suppress copying zero-width bitfields. 2585 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2586 return false; 2587 2588 Expr *MemberExprBase = 2589 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2590 SourceLocation(), Param, false, 2591 Loc, ParamType, VK_LValue, 0); 2592 2593 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2594 2595 if (Moving) { 2596 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2597 } 2598 2599 // Build a reference to this field within the parameter. 2600 CXXScopeSpec SS; 2601 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2602 Sema::LookupMemberName); 2603 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2604 : cast<ValueDecl>(Field), AS_public); 2605 MemberLookup.resolveKind(); 2606 ExprResult CtorArg 2607 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2608 ParamType, Loc, 2609 /*IsArrow=*/false, 2610 SS, 2611 /*TemplateKWLoc=*/SourceLocation(), 2612 /*FirstQualifierInScope=*/0, 2613 MemberLookup, 2614 /*TemplateArgs=*/0); 2615 if (CtorArg.isInvalid()) 2616 return true; 2617 2618 // C++11 [class.copy]p15: 2619 // - if a member m has rvalue reference type T&&, it is direct-initialized 2620 // with static_cast<T&&>(x.m); 2621 if (RefersToRValueRef(CtorArg.get())) { 2622 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2623 } 2624 2625 // When the field we are copying is an array, create index variables for 2626 // each dimension of the array. We use these index variables to subscript 2627 // the source array, and other clients (e.g., CodeGen) will perform the 2628 // necessary iteration with these index variables. 2629 SmallVector<VarDecl *, 4> IndexVariables; 2630 QualType BaseType = Field->getType(); 2631 QualType SizeType = SemaRef.Context.getSizeType(); 2632 bool InitializingArray = false; 2633 while (const ConstantArrayType *Array 2634 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2635 InitializingArray = true; 2636 // Create the iteration variable for this array index. 2637 IdentifierInfo *IterationVarName = 0; 2638 { 2639 SmallString<8> Str; 2640 llvm::raw_svector_ostream OS(Str); 2641 OS << "__i" << IndexVariables.size(); 2642 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2643 } 2644 VarDecl *IterationVar 2645 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2646 IterationVarName, SizeType, 2647 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2648 SC_None, SC_None); 2649 IndexVariables.push_back(IterationVar); 2650 2651 // Create a reference to the iteration variable. 2652 ExprResult IterationVarRef 2653 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2654 assert(!IterationVarRef.isInvalid() && 2655 "Reference to invented variable cannot fail!"); 2656 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2657 assert(!IterationVarRef.isInvalid() && 2658 "Conversion of invented variable cannot fail!"); 2659 2660 // Subscript the array with this iteration variable. 2661 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2662 IterationVarRef.take(), 2663 Loc); 2664 if (CtorArg.isInvalid()) 2665 return true; 2666 2667 BaseType = Array->getElementType(); 2668 } 2669 2670 // The array subscript expression is an lvalue, which is wrong for moving. 2671 if (Moving && InitializingArray) 2672 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2673 2674 // Construct the entity that we will be initializing. For an array, this 2675 // will be first element in the array, which may require several levels 2676 // of array-subscript entities. 2677 SmallVector<InitializedEntity, 4> Entities; 2678 Entities.reserve(1 + IndexVariables.size()); 2679 if (Indirect) 2680 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2681 else 2682 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2683 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2684 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2685 0, 2686 Entities.back())); 2687 2688 // Direct-initialize to use the copy constructor. 2689 InitializationKind InitKind = 2690 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2691 2692 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2693 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2694 &CtorArgE, 1); 2695 2696 ExprResult MemberInit 2697 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2698 MultiExprArg(&CtorArgE, 1)); 2699 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2700 if (MemberInit.isInvalid()) 2701 return true; 2702 2703 if (Indirect) { 2704 assert(IndexVariables.size() == 0 && 2705 "Indirect field improperly initialized"); 2706 CXXMemberInit 2707 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2708 Loc, Loc, 2709 MemberInit.takeAs<Expr>(), 2710 Loc); 2711 } else 2712 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2713 Loc, MemberInit.takeAs<Expr>(), 2714 Loc, 2715 IndexVariables.data(), 2716 IndexVariables.size()); 2717 return false; 2718 } 2719 2720 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2721 2722 QualType FieldBaseElementType = 2723 SemaRef.Context.getBaseElementType(Field->getType()); 2724 2725 if (FieldBaseElementType->isRecordType()) { 2726 InitializedEntity InitEntity 2727 = Indirect? InitializedEntity::InitializeMember(Indirect) 2728 : InitializedEntity::InitializeMember(Field); 2729 InitializationKind InitKind = 2730 InitializationKind::CreateDefault(Loc); 2731 2732 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2733 ExprResult MemberInit = 2734 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2735 2736 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2737 if (MemberInit.isInvalid()) 2738 return true; 2739 2740 if (Indirect) 2741 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2742 Indirect, Loc, 2743 Loc, 2744 MemberInit.get(), 2745 Loc); 2746 else 2747 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2748 Field, Loc, Loc, 2749 MemberInit.get(), 2750 Loc); 2751 return false; 2752 } 2753 2754 if (!Field->getParent()->isUnion()) { 2755 if (FieldBaseElementType->isReferenceType()) { 2756 SemaRef.Diag(Constructor->getLocation(), 2757 diag::err_uninitialized_member_in_ctor) 2758 << (int)Constructor->isImplicit() 2759 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2760 << 0 << Field->getDeclName(); 2761 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2762 return true; 2763 } 2764 2765 if (FieldBaseElementType.isConstQualified()) { 2766 SemaRef.Diag(Constructor->getLocation(), 2767 diag::err_uninitialized_member_in_ctor) 2768 << (int)Constructor->isImplicit() 2769 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2770 << 1 << Field->getDeclName(); 2771 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2772 return true; 2773 } 2774 } 2775 2776 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2777 FieldBaseElementType->isObjCRetainableType() && 2778 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2779 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2780 // ARC: 2781 // Default-initialize Objective-C pointers to NULL. 2782 CXXMemberInit 2783 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2784 Loc, Loc, 2785 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2786 Loc); 2787 return false; 2788 } 2789 2790 // Nothing to initialize. 2791 CXXMemberInit = 0; 2792 return false; 2793 } 2794 2795 namespace { 2796 struct BaseAndFieldInfo { 2797 Sema &S; 2798 CXXConstructorDecl *Ctor; 2799 bool AnyErrorsInInits; 2800 ImplicitInitializerKind IIK; 2801 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2802 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2803 2804 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2805 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2806 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2807 if (Generated && Ctor->isCopyConstructor()) 2808 IIK = IIK_Copy; 2809 else if (Generated && Ctor->isMoveConstructor()) 2810 IIK = IIK_Move; 2811 else 2812 IIK = IIK_Default; 2813 } 2814 2815 bool isImplicitCopyOrMove() const { 2816 switch (IIK) { 2817 case IIK_Copy: 2818 case IIK_Move: 2819 return true; 2820 2821 case IIK_Default: 2822 return false; 2823 } 2824 2825 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2826 } 2827 2828 bool addFieldInitializer(CXXCtorInitializer *Init) { 2829 AllToInit.push_back(Init); 2830 2831 // Check whether this initializer makes the field "used". 2832 if (Init->getInit() && Init->getInit()->HasSideEffects(S.Context)) 2833 S.UnusedPrivateFields.remove(Init->getAnyMember()); 2834 2835 return false; 2836 } 2837 }; 2838 } 2839 2840 /// \brief Determine whether the given indirect field declaration is somewhere 2841 /// within an anonymous union. 2842 static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2843 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2844 CEnd = F->chain_end(); 2845 C != CEnd; ++C) 2846 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2847 if (Record->isUnion()) 2848 return true; 2849 2850 return false; 2851 } 2852 2853 /// \brief Determine whether the given type is an incomplete or zero-lenfgth 2854 /// array type. 2855 static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2856 if (T->isIncompleteArrayType()) 2857 return true; 2858 2859 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2860 if (!ArrayT->getSize()) 2861 return true; 2862 2863 T = ArrayT->getElementType(); 2864 } 2865 2866 return false; 2867 } 2868 2869 static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2870 FieldDecl *Field, 2871 IndirectFieldDecl *Indirect = 0) { 2872 2873 // Overwhelmingly common case: we have a direct initializer for this field. 2874 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) 2875 return Info.addFieldInitializer(Init); 2876 2877 // C++11 [class.base.init]p8: if the entity is a non-static data member that 2878 // has a brace-or-equal-initializer, the entity is initialized as specified 2879 // in [dcl.init]. 2880 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2881 CXXCtorInitializer *Init; 2882 if (Indirect) 2883 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2884 SourceLocation(), 2885 SourceLocation(), 0, 2886 SourceLocation()); 2887 else 2888 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2889 SourceLocation(), 2890 SourceLocation(), 0, 2891 SourceLocation()); 2892 return Info.addFieldInitializer(Init); 2893 } 2894 2895 // Don't build an implicit initializer for union members if none was 2896 // explicitly specified. 2897 if (Field->getParent()->isUnion() || 2898 (Indirect && isWithinAnonymousUnion(Indirect))) 2899 return false; 2900 2901 // Don't initialize incomplete or zero-length arrays. 2902 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2903 return false; 2904 2905 // Don't try to build an implicit initializer if there were semantic 2906 // errors in any of the initializers (and therefore we might be 2907 // missing some that the user actually wrote). 2908 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2909 return false; 2910 2911 CXXCtorInitializer *Init = 0; 2912 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2913 Indirect, Init)) 2914 return true; 2915 2916 if (!Init) 2917 return false; 2918 2919 return Info.addFieldInitializer(Init); 2920 } 2921 2922 bool 2923 Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2924 CXXCtorInitializer *Initializer) { 2925 assert(Initializer->isDelegatingInitializer()); 2926 Constructor->setNumCtorInitializers(1); 2927 CXXCtorInitializer **initializer = 2928 new (Context) CXXCtorInitializer*[1]; 2929 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2930 Constructor->setCtorInitializers(initializer); 2931 2932 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2933 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 2934 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2935 } 2936 2937 DelegatingCtorDecls.push_back(Constructor); 2938 2939 return false; 2940 } 2941 2942 bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2943 CXXCtorInitializer **Initializers, 2944 unsigned NumInitializers, 2945 bool AnyErrors) { 2946 if (Constructor->isDependentContext()) { 2947 // Just store the initializers as written, they will be checked during 2948 // instantiation. 2949 if (NumInitializers > 0) { 2950 Constructor->setNumCtorInitializers(NumInitializers); 2951 CXXCtorInitializer **baseOrMemberInitializers = 2952 new (Context) CXXCtorInitializer*[NumInitializers]; 2953 memcpy(baseOrMemberInitializers, Initializers, 2954 NumInitializers * sizeof(CXXCtorInitializer*)); 2955 Constructor->setCtorInitializers(baseOrMemberInitializers); 2956 } 2957 2958 return false; 2959 } 2960 2961 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2962 2963 // We need to build the initializer AST according to order of construction 2964 // and not what user specified in the Initializers list. 2965 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2966 if (!ClassDecl) 2967 return true; 2968 2969 bool HadError = false; 2970 2971 for (unsigned i = 0; i < NumInitializers; i++) { 2972 CXXCtorInitializer *Member = Initializers[i]; 2973 2974 if (Member->isBaseInitializer()) 2975 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2976 else 2977 Info.AllBaseFields[Member->getAnyMember()] = Member; 2978 } 2979 2980 // Keep track of the direct virtual bases. 2981 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2982 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2983 E = ClassDecl->bases_end(); I != E; ++I) { 2984 if (I->isVirtual()) 2985 DirectVBases.insert(I); 2986 } 2987 2988 // Push virtual bases before others. 2989 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2990 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2991 2992 if (CXXCtorInitializer *Value 2993 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2994 Info.AllToInit.push_back(Value); 2995 } else if (!AnyErrors) { 2996 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2997 CXXCtorInitializer *CXXBaseInit; 2998 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2999 VBase, IsInheritedVirtualBase, 3000 CXXBaseInit)) { 3001 HadError = true; 3002 continue; 3003 } 3004 3005 Info.AllToInit.push_back(CXXBaseInit); 3006 } 3007 } 3008 3009 // Non-virtual bases. 3010 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3011 E = ClassDecl->bases_end(); Base != E; ++Base) { 3012 // Virtuals are in the virtual base list and already constructed. 3013 if (Base->isVirtual()) 3014 continue; 3015 3016 if (CXXCtorInitializer *Value 3017 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3018 Info.AllToInit.push_back(Value); 3019 } else if (!AnyErrors) { 3020 CXXCtorInitializer *CXXBaseInit; 3021 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3022 Base, /*IsInheritedVirtualBase=*/false, 3023 CXXBaseInit)) { 3024 HadError = true; 3025 continue; 3026 } 3027 3028 Info.AllToInit.push_back(CXXBaseInit); 3029 } 3030 } 3031 3032 // Fields. 3033 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3034 MemEnd = ClassDecl->decls_end(); 3035 Mem != MemEnd; ++Mem) { 3036 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3037 // C++ [class.bit]p2: 3038 // A declaration for a bit-field that omits the identifier declares an 3039 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3040 // initialized. 3041 if (F->isUnnamedBitfield()) 3042 continue; 3043 3044 // If we're not generating the implicit copy/move constructor, then we'll 3045 // handle anonymous struct/union fields based on their individual 3046 // indirect fields. 3047 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 3048 continue; 3049 3050 if (CollectFieldInitializer(*this, Info, F)) 3051 HadError = true; 3052 continue; 3053 } 3054 3055 // Beyond this point, we only consider default initialization. 3056 if (Info.IIK != IIK_Default) 3057 continue; 3058 3059 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3060 if (F->getType()->isIncompleteArrayType()) { 3061 assert(ClassDecl->hasFlexibleArrayMember() && 3062 "Incomplete array type is not valid"); 3063 continue; 3064 } 3065 3066 // Initialize each field of an anonymous struct individually. 3067 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3068 HadError = true; 3069 3070 continue; 3071 } 3072 } 3073 3074 NumInitializers = Info.AllToInit.size(); 3075 if (NumInitializers > 0) { 3076 Constructor->setNumCtorInitializers(NumInitializers); 3077 CXXCtorInitializer **baseOrMemberInitializers = 3078 new (Context) CXXCtorInitializer*[NumInitializers]; 3079 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3080 NumInitializers * sizeof(CXXCtorInitializer*)); 3081 Constructor->setCtorInitializers(baseOrMemberInitializers); 3082 3083 // Constructors implicitly reference the base and member 3084 // destructors. 3085 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3086 Constructor->getParent()); 3087 } 3088 3089 return HadError; 3090 } 3091 3092 static void *GetKeyForTopLevelField(FieldDecl *Field) { 3093 // For anonymous unions, use the class declaration as the key. 3094 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3095 if (RT->getDecl()->isAnonymousStructOrUnion()) 3096 return static_cast<void *>(RT->getDecl()); 3097 } 3098 return static_cast<void *>(Field); 3099 } 3100 3101 static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3102 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3103 } 3104 3105 static void *GetKeyForMember(ASTContext &Context, 3106 CXXCtorInitializer *Member) { 3107 if (!Member->isAnyMemberInitializer()) 3108 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3109 3110 // For fields injected into the class via declaration of an anonymous union, 3111 // use its anonymous union class declaration as the unique key. 3112 FieldDecl *Field = Member->getAnyMember(); 3113 3114 // If the field is a member of an anonymous struct or union, our key 3115 // is the anonymous record decl that's a direct child of the class. 3116 RecordDecl *RD = Field->getParent(); 3117 if (RD->isAnonymousStructOrUnion()) { 3118 while (true) { 3119 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3120 if (Parent->isAnonymousStructOrUnion()) 3121 RD = Parent; 3122 else 3123 break; 3124 } 3125 3126 return static_cast<void *>(RD); 3127 } 3128 3129 return static_cast<void *>(Field); 3130 } 3131 3132 static void 3133 DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3134 const CXXConstructorDecl *Constructor, 3135 CXXCtorInitializer **Inits, 3136 unsigned NumInits) { 3137 if (Constructor->getDeclContext()->isDependentContext()) 3138 return; 3139 3140 // Don't check initializers order unless the warning is enabled at the 3141 // location of at least one initializer. 3142 bool ShouldCheckOrder = false; 3143 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3144 CXXCtorInitializer *Init = Inits[InitIndex]; 3145 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3146 Init->getSourceLocation()) 3147 != DiagnosticsEngine::Ignored) { 3148 ShouldCheckOrder = true; 3149 break; 3150 } 3151 } 3152 if (!ShouldCheckOrder) 3153 return; 3154 3155 // Build the list of bases and members in the order that they'll 3156 // actually be initialized. The explicit initializers should be in 3157 // this same order but may be missing things. 3158 SmallVector<const void*, 32> IdealInitKeys; 3159 3160 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3161 3162 // 1. Virtual bases. 3163 for (CXXRecordDecl::base_class_const_iterator VBase = 3164 ClassDecl->vbases_begin(), 3165 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3166 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3167 3168 // 2. Non-virtual bases. 3169 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3170 E = ClassDecl->bases_end(); Base != E; ++Base) { 3171 if (Base->isVirtual()) 3172 continue; 3173 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3174 } 3175 3176 // 3. Direct fields. 3177 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3178 E = ClassDecl->field_end(); Field != E; ++Field) { 3179 if (Field->isUnnamedBitfield()) 3180 continue; 3181 3182 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3183 } 3184 3185 unsigned NumIdealInits = IdealInitKeys.size(); 3186 unsigned IdealIndex = 0; 3187 3188 CXXCtorInitializer *PrevInit = 0; 3189 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3190 CXXCtorInitializer *Init = Inits[InitIndex]; 3191 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3192 3193 // Scan forward to try to find this initializer in the idealized 3194 // initializers list. 3195 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3196 if (InitKey == IdealInitKeys[IdealIndex]) 3197 break; 3198 3199 // If we didn't find this initializer, it must be because we 3200 // scanned past it on a previous iteration. That can only 3201 // happen if we're out of order; emit a warning. 3202 if (IdealIndex == NumIdealInits && PrevInit) { 3203 Sema::SemaDiagnosticBuilder D = 3204 SemaRef.Diag(PrevInit->getSourceLocation(), 3205 diag::warn_initializer_out_of_order); 3206 3207 if (PrevInit->isAnyMemberInitializer()) 3208 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3209 else 3210 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3211 3212 if (Init->isAnyMemberInitializer()) 3213 D << 0 << Init->getAnyMember()->getDeclName(); 3214 else 3215 D << 1 << Init->getTypeSourceInfo()->getType(); 3216 3217 // Move back to the initializer's location in the ideal list. 3218 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3219 if (InitKey == IdealInitKeys[IdealIndex]) 3220 break; 3221 3222 assert(IdealIndex != NumIdealInits && 3223 "initializer not found in initializer list"); 3224 } 3225 3226 PrevInit = Init; 3227 } 3228 } 3229 3230 namespace { 3231 bool CheckRedundantInit(Sema &S, 3232 CXXCtorInitializer *Init, 3233 CXXCtorInitializer *&PrevInit) { 3234 if (!PrevInit) { 3235 PrevInit = Init; 3236 return false; 3237 } 3238 3239 if (FieldDecl *Field = Init->getMember()) 3240 S.Diag(Init->getSourceLocation(), 3241 diag::err_multiple_mem_initialization) 3242 << Field->getDeclName() 3243 << Init->getSourceRange(); 3244 else { 3245 const Type *BaseClass = Init->getBaseClass(); 3246 assert(BaseClass && "neither field nor base"); 3247 S.Diag(Init->getSourceLocation(), 3248 diag::err_multiple_base_initialization) 3249 << QualType(BaseClass, 0) 3250 << Init->getSourceRange(); 3251 } 3252 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3253 << 0 << PrevInit->getSourceRange(); 3254 3255 return true; 3256 } 3257 3258 typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3259 typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3260 3261 bool CheckRedundantUnionInit(Sema &S, 3262 CXXCtorInitializer *Init, 3263 RedundantUnionMap &Unions) { 3264 FieldDecl *Field = Init->getAnyMember(); 3265 RecordDecl *Parent = Field->getParent(); 3266 NamedDecl *Child = Field; 3267 3268 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3269 if (Parent->isUnion()) { 3270 UnionEntry &En = Unions[Parent]; 3271 if (En.first && En.first != Child) { 3272 S.Diag(Init->getSourceLocation(), 3273 diag::err_multiple_mem_union_initialization) 3274 << Field->getDeclName() 3275 << Init->getSourceRange(); 3276 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3277 << 0 << En.second->getSourceRange(); 3278 return true; 3279 } 3280 if (!En.first) { 3281 En.first = Child; 3282 En.second = Init; 3283 } 3284 if (!Parent->isAnonymousStructOrUnion()) 3285 return false; 3286 } 3287 3288 Child = Parent; 3289 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3290 } 3291 3292 return false; 3293 } 3294 } 3295 3296 /// ActOnMemInitializers - Handle the member initializers for a constructor. 3297 void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3298 SourceLocation ColonLoc, 3299 CXXCtorInitializer **meminits, 3300 unsigned NumMemInits, 3301 bool AnyErrors) { 3302 if (!ConstructorDecl) 3303 return; 3304 3305 AdjustDeclIfTemplate(ConstructorDecl); 3306 3307 CXXConstructorDecl *Constructor 3308 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3309 3310 if (!Constructor) { 3311 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3312 return; 3313 } 3314 3315 CXXCtorInitializer **MemInits = 3316 reinterpret_cast<CXXCtorInitializer **>(meminits); 3317 3318 // Mapping for the duplicate initializers check. 3319 // For member initializers, this is keyed with a FieldDecl*. 3320 // For base initializers, this is keyed with a Type*. 3321 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3322 3323 // Mapping for the inconsistent anonymous-union initializers check. 3324 RedundantUnionMap MemberUnions; 3325 3326 bool HadError = false; 3327 for (unsigned i = 0; i < NumMemInits; i++) { 3328 CXXCtorInitializer *Init = MemInits[i]; 3329 3330 // Set the source order index. 3331 Init->setSourceOrder(i); 3332 3333 if (Init->isAnyMemberInitializer()) { 3334 FieldDecl *Field = Init->getAnyMember(); 3335 if (CheckRedundantInit(*this, Init, Members[Field]) || 3336 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3337 HadError = true; 3338 } else if (Init->isBaseInitializer()) { 3339 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3340 if (CheckRedundantInit(*this, Init, Members[Key])) 3341 HadError = true; 3342 } else { 3343 assert(Init->isDelegatingInitializer()); 3344 // This must be the only initializer 3345 if (i != 0 || NumMemInits > 1) { 3346 Diag(MemInits[0]->getSourceLocation(), 3347 diag::err_delegating_initializer_alone) 3348 << MemInits[0]->getSourceRange(); 3349 HadError = true; 3350 // We will treat this as being the only initializer. 3351 } 3352 SetDelegatingInitializer(Constructor, MemInits[i]); 3353 // Return immediately as the initializer is set. 3354 return; 3355 } 3356 } 3357 3358 if (HadError) 3359 return; 3360 3361 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3362 3363 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3364 } 3365 3366 void 3367 Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3368 CXXRecordDecl *ClassDecl) { 3369 // Ignore dependent contexts. Also ignore unions, since their members never 3370 // have destructors implicitly called. 3371 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3372 return; 3373 3374 // FIXME: all the access-control diagnostics are positioned on the 3375 // field/base declaration. That's probably good; that said, the 3376 // user might reasonably want to know why the destructor is being 3377 // emitted, and we currently don't say. 3378 3379 // Non-static data members. 3380 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3381 E = ClassDecl->field_end(); I != E; ++I) { 3382 FieldDecl *Field = *I; 3383 if (Field->isInvalidDecl()) 3384 continue; 3385 3386 // Don't destroy incomplete or zero-length arrays. 3387 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3388 continue; 3389 3390 QualType FieldType = Context.getBaseElementType(Field->getType()); 3391 3392 const RecordType* RT = FieldType->getAs<RecordType>(); 3393 if (!RT) 3394 continue; 3395 3396 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3397 if (FieldClassDecl->isInvalidDecl()) 3398 continue; 3399 if (FieldClassDecl->hasIrrelevantDestructor()) 3400 continue; 3401 // The destructor for an implicit anonymous union member is never invoked. 3402 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3403 continue; 3404 3405 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3406 assert(Dtor && "No dtor found for FieldClassDecl!"); 3407 CheckDestructorAccess(Field->getLocation(), Dtor, 3408 PDiag(diag::err_access_dtor_field) 3409 << Field->getDeclName() 3410 << FieldType); 3411 3412 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3413 DiagnoseUseOfDecl(Dtor, Location); 3414 } 3415 3416 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3417 3418 // Bases. 3419 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3420 E = ClassDecl->bases_end(); Base != E; ++Base) { 3421 // Bases are always records in a well-formed non-dependent class. 3422 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3423 3424 // Remember direct virtual bases. 3425 if (Base->isVirtual()) 3426 DirectVirtualBases.insert(RT); 3427 3428 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3429 // If our base class is invalid, we probably can't get its dtor anyway. 3430 if (BaseClassDecl->isInvalidDecl()) 3431 continue; 3432 if (BaseClassDecl->hasIrrelevantDestructor()) 3433 continue; 3434 3435 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3436 assert(Dtor && "No dtor found for BaseClassDecl!"); 3437 3438 // FIXME: caret should be on the start of the class name 3439 CheckDestructorAccess(Base->getLocStart(), Dtor, 3440 PDiag(diag::err_access_dtor_base) 3441 << Base->getType() 3442 << Base->getSourceRange(), 3443 Context.getTypeDeclType(ClassDecl)); 3444 3445 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3446 DiagnoseUseOfDecl(Dtor, Location); 3447 } 3448 3449 // Virtual bases. 3450 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3451 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3452 3453 // Bases are always records in a well-formed non-dependent class. 3454 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3455 3456 // Ignore direct virtual bases. 3457 if (DirectVirtualBases.count(RT)) 3458 continue; 3459 3460 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3461 // If our base class is invalid, we probably can't get its dtor anyway. 3462 if (BaseClassDecl->isInvalidDecl()) 3463 continue; 3464 if (BaseClassDecl->hasIrrelevantDestructor()) 3465 continue; 3466 3467 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3468 assert(Dtor && "No dtor found for BaseClassDecl!"); 3469 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3470 PDiag(diag::err_access_dtor_vbase) 3471 << VBase->getType(), 3472 Context.getTypeDeclType(ClassDecl)); 3473 3474 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3475 DiagnoseUseOfDecl(Dtor, Location); 3476 } 3477 } 3478 3479 void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3480 if (!CDtorDecl) 3481 return; 3482 3483 if (CXXConstructorDecl *Constructor 3484 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3485 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3486 } 3487 3488 bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3489 unsigned DiagID, AbstractDiagSelID SelID) { 3490 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3491 unsigned DiagID; 3492 AbstractDiagSelID SelID; 3493 3494 public: 3495 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3496 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3497 3498 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 3499 if (Suppressed) return; 3500 if (SelID == -1) 3501 S.Diag(Loc, DiagID) << T; 3502 else 3503 S.Diag(Loc, DiagID) << SelID << T; 3504 } 3505 } Diagnoser(DiagID, SelID); 3506 3507 return RequireNonAbstractType(Loc, T, Diagnoser); 3508 } 3509 3510 bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3511 TypeDiagnoser &Diagnoser) { 3512 if (!getLangOpts().CPlusPlus) 3513 return false; 3514 3515 if (const ArrayType *AT = Context.getAsArrayType(T)) 3516 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3517 3518 if (const PointerType *PT = T->getAs<PointerType>()) { 3519 // Find the innermost pointer type. 3520 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3521 PT = T; 3522 3523 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3524 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3525 } 3526 3527 const RecordType *RT = T->getAs<RecordType>(); 3528 if (!RT) 3529 return false; 3530 3531 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3532 3533 // We can't answer whether something is abstract until it has a 3534 // definition. If it's currently being defined, we'll walk back 3535 // over all the declarations when we have a full definition. 3536 const CXXRecordDecl *Def = RD->getDefinition(); 3537 if (!Def || Def->isBeingDefined()) 3538 return false; 3539 3540 if (!RD->isAbstract()) 3541 return false; 3542 3543 Diagnoser.diagnose(*this, Loc, T); 3544 DiagnoseAbstractType(RD); 3545 3546 return true; 3547 } 3548 3549 void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3550 // Check if we've already emitted the list of pure virtual functions 3551 // for this class. 3552 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3553 return; 3554 3555 CXXFinalOverriderMap FinalOverriders; 3556 RD->getFinalOverriders(FinalOverriders); 3557 3558 // Keep a set of seen pure methods so we won't diagnose the same method 3559 // more than once. 3560 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3561 3562 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3563 MEnd = FinalOverriders.end(); 3564 M != MEnd; 3565 ++M) { 3566 for (OverridingMethods::iterator SO = M->second.begin(), 3567 SOEnd = M->second.end(); 3568 SO != SOEnd; ++SO) { 3569 // C++ [class.abstract]p4: 3570 // A class is abstract if it contains or inherits at least one 3571 // pure virtual function for which the final overrider is pure 3572 // virtual. 3573 3574 // 3575 if (SO->second.size() != 1) 3576 continue; 3577 3578 if (!SO->second.front().Method->isPure()) 3579 continue; 3580 3581 if (!SeenPureMethods.insert(SO->second.front().Method)) 3582 continue; 3583 3584 Diag(SO->second.front().Method->getLocation(), 3585 diag::note_pure_virtual_function) 3586 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3587 } 3588 } 3589 3590 if (!PureVirtualClassDiagSet) 3591 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3592 PureVirtualClassDiagSet->insert(RD); 3593 } 3594 3595 namespace { 3596 struct AbstractUsageInfo { 3597 Sema &S; 3598 CXXRecordDecl *Record; 3599 CanQualType AbstractType; 3600 bool Invalid; 3601 3602 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3603 : S(S), Record(Record), 3604 AbstractType(S.Context.getCanonicalType( 3605 S.Context.getTypeDeclType(Record))), 3606 Invalid(false) {} 3607 3608 void DiagnoseAbstractType() { 3609 if (Invalid) return; 3610 S.DiagnoseAbstractType(Record); 3611 Invalid = true; 3612 } 3613 3614 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3615 }; 3616 3617 struct CheckAbstractUsage { 3618 AbstractUsageInfo &Info; 3619 const NamedDecl *Ctx; 3620 3621 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3622 : Info(Info), Ctx(Ctx) {} 3623 3624 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3625 switch (TL.getTypeLocClass()) { 3626 #define ABSTRACT_TYPELOC(CLASS, PARENT) 3627 #define TYPELOC(CLASS, PARENT) \ 3628 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3629 #include "clang/AST/TypeLocNodes.def" 3630 } 3631 } 3632 3633 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3634 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3635 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3636 if (!TL.getArg(I)) 3637 continue; 3638 3639 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3640 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3641 } 3642 } 3643 3644 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3645 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3646 } 3647 3648 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3649 // Visit the type parameters from a permissive context. 3650 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3651 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3652 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3653 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3654 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3655 // TODO: other template argument types? 3656 } 3657 } 3658 3659 // Visit pointee types from a permissive context. 3660 #define CheckPolymorphic(Type) \ 3661 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3662 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3663 } 3664 CheckPolymorphic(PointerTypeLoc) 3665 CheckPolymorphic(ReferenceTypeLoc) 3666 CheckPolymorphic(MemberPointerTypeLoc) 3667 CheckPolymorphic(BlockPointerTypeLoc) 3668 CheckPolymorphic(AtomicTypeLoc) 3669 3670 /// Handle all the types we haven't given a more specific 3671 /// implementation for above. 3672 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3673 // Every other kind of type that we haven't called out already 3674 // that has an inner type is either (1) sugar or (2) contains that 3675 // inner type in some way as a subobject. 3676 if (TypeLoc Next = TL.getNextTypeLoc()) 3677 return Visit(Next, Sel); 3678 3679 // If there's no inner type and we're in a permissive context, 3680 // don't diagnose. 3681 if (Sel == Sema::AbstractNone) return; 3682 3683 // Check whether the type matches the abstract type. 3684 QualType T = TL.getType(); 3685 if (T->isArrayType()) { 3686 Sel = Sema::AbstractArrayType; 3687 T = Info.S.Context.getBaseElementType(T); 3688 } 3689 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3690 if (CT != Info.AbstractType) return; 3691 3692 // It matched; do some magic. 3693 if (Sel == Sema::AbstractArrayType) { 3694 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3695 << T << TL.getSourceRange(); 3696 } else { 3697 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3698 << Sel << T << TL.getSourceRange(); 3699 } 3700 Info.DiagnoseAbstractType(); 3701 } 3702 }; 3703 3704 void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3705 Sema::AbstractDiagSelID Sel) { 3706 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3707 } 3708 3709 } 3710 3711 /// Check for invalid uses of an abstract type in a method declaration. 3712 static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3713 CXXMethodDecl *MD) { 3714 // No need to do the check on definitions, which require that 3715 // the return/param types be complete. 3716 if (MD->doesThisDeclarationHaveABody()) 3717 return; 3718 3719 // For safety's sake, just ignore it if we don't have type source 3720 // information. This should never happen for non-implicit methods, 3721 // but... 3722 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3723 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3724 } 3725 3726 /// Check for invalid uses of an abstract type within a class definition. 3727 static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3728 CXXRecordDecl *RD) { 3729 for (CXXRecordDecl::decl_iterator 3730 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3731 Decl *D = *I; 3732 if (D->isImplicit()) continue; 3733 3734 // Methods and method templates. 3735 if (isa<CXXMethodDecl>(D)) { 3736 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3737 } else if (isa<FunctionTemplateDecl>(D)) { 3738 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3739 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3740 3741 // Fields and static variables. 3742 } else if (isa<FieldDecl>(D)) { 3743 FieldDecl *FD = cast<FieldDecl>(D); 3744 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3745 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3746 } else if (isa<VarDecl>(D)) { 3747 VarDecl *VD = cast<VarDecl>(D); 3748 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3749 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3750 3751 // Nested classes and class templates. 3752 } else if (isa<CXXRecordDecl>(D)) { 3753 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3754 } else if (isa<ClassTemplateDecl>(D)) { 3755 CheckAbstractClassUsage(Info, 3756 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3757 } 3758 } 3759 } 3760 3761 /// \brief Perform semantic checks on a class definition that has been 3762 /// completing, introducing implicitly-declared members, checking for 3763 /// abstract types, etc. 3764 void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3765 if (!Record) 3766 return; 3767 3768 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3769 AbstractUsageInfo Info(*this, Record); 3770 CheckAbstractClassUsage(Info, Record); 3771 } 3772 3773 // If this is not an aggregate type and has no user-declared constructor, 3774 // complain about any non-static data members of reference or const scalar 3775 // type, since they will never get initializers. 3776 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3777 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3778 !Record->isLambda()) { 3779 bool Complained = false; 3780 for (RecordDecl::field_iterator F = Record->field_begin(), 3781 FEnd = Record->field_end(); 3782 F != FEnd; ++F) { 3783 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3784 continue; 3785 3786 if (F->getType()->isReferenceType() || 3787 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3788 if (!Complained) { 3789 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3790 << Record->getTagKind() << Record; 3791 Complained = true; 3792 } 3793 3794 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3795 << F->getType()->isReferenceType() 3796 << F->getDeclName(); 3797 } 3798 } 3799 } 3800 3801 if (Record->isDynamicClass() && !Record->isDependentType()) 3802 DynamicClasses.push_back(Record); 3803 3804 if (Record->getIdentifier()) { 3805 // C++ [class.mem]p13: 3806 // If T is the name of a class, then each of the following shall have a 3807 // name different from T: 3808 // - every member of every anonymous union that is a member of class T. 3809 // 3810 // C++ [class.mem]p14: 3811 // In addition, if class T has a user-declared constructor (12.1), every 3812 // non-static data member of class T shall have a name different from T. 3813 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3814 R.first != R.second; ++R.first) { 3815 NamedDecl *D = *R.first; 3816 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3817 isa<IndirectFieldDecl>(D)) { 3818 Diag(D->getLocation(), diag::err_member_name_of_class) 3819 << D->getDeclName(); 3820 break; 3821 } 3822 } 3823 } 3824 3825 // Warn if the class has virtual methods but non-virtual public destructor. 3826 if (Record->isPolymorphic() && !Record->isDependentType()) { 3827 CXXDestructorDecl *dtor = Record->getDestructor(); 3828 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3829 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3830 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3831 } 3832 3833 // See if a method overloads virtual methods in a base 3834 /// class without overriding any. 3835 if (!Record->isDependentType()) { 3836 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3837 MEnd = Record->method_end(); 3838 M != MEnd; ++M) { 3839 if (!M->isStatic()) 3840 DiagnoseHiddenVirtualMethods(Record, *M); 3841 } 3842 } 3843 3844 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3845 // function that is not a constructor declares that member function to be 3846 // const. [...] The class of which that function is a member shall be 3847 // a literal type. 3848 // 3849 // If the class has virtual bases, any constexpr members will already have 3850 // been diagnosed by the checks performed on the member declaration, so 3851 // suppress this (less useful) diagnostic. 3852 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3853 !Record->isLiteral() && !Record->getNumVBases()) { 3854 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3855 MEnd = Record->method_end(); 3856 M != MEnd; ++M) { 3857 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3858 switch (Record->getTemplateSpecializationKind()) { 3859 case TSK_ImplicitInstantiation: 3860 case TSK_ExplicitInstantiationDeclaration: 3861 case TSK_ExplicitInstantiationDefinition: 3862 // If a template instantiates to a non-literal type, but its members 3863 // instantiate to constexpr functions, the template is technically 3864 // ill-formed, but we allow it for sanity. 3865 continue; 3866 3867 case TSK_Undeclared: 3868 case TSK_ExplicitSpecialization: 3869 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 3870 diag::err_constexpr_method_non_literal); 3871 break; 3872 } 3873 3874 // Only produce one error per class. 3875 break; 3876 } 3877 } 3878 } 3879 3880 // Declare inherited constructors. We do this eagerly here because: 3881 // - The standard requires an eager diagnostic for conflicting inherited 3882 // constructors from different classes. 3883 // - The lazy declaration of the other implicit constructors is so as to not 3884 // waste space and performance on classes that are not meant to be 3885 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3886 // have inherited constructors. 3887 DeclareInheritedConstructors(Record); 3888 } 3889 3890 void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3891 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3892 ME = Record->method_end(); 3893 MI != ME; ++MI) 3894 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) 3895 CheckExplicitlyDefaultedSpecialMember(*MI); 3896 } 3897 3898 /// Is the special member function which would be selected to perform the 3899 /// specified operation on the specified class type a constexpr constructor? 3900 static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3901 Sema::CXXSpecialMember CSM, 3902 bool ConstArg) { 3903 Sema::SpecialMemberOverloadResult *SMOR = 3904 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 3905 false, false, false, false); 3906 if (!SMOR || !SMOR->getMethod()) 3907 // A constructor we wouldn't select can't be "involved in initializing" 3908 // anything. 3909 return true; 3910 return SMOR->getMethod()->isConstexpr(); 3911 } 3912 3913 /// Determine whether the specified special member function would be constexpr 3914 /// if it were implicitly defined. 3915 static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3916 Sema::CXXSpecialMember CSM, 3917 bool ConstArg) { 3918 if (!S.getLangOpts().CPlusPlus0x) 3919 return false; 3920 3921 // C++11 [dcl.constexpr]p4: 3922 // In the definition of a constexpr constructor [...] 3923 switch (CSM) { 3924 case Sema::CXXDefaultConstructor: 3925 // Since default constructor lookup is essentially trivial (and cannot 3926 // involve, for instance, template instantiation), we compute whether a 3927 // defaulted default constructor is constexpr directly within CXXRecordDecl. 3928 // 3929 // This is important for performance; we need to know whether the default 3930 // constructor is constexpr to determine whether the type is a literal type. 3931 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 3932 3933 case Sema::CXXCopyConstructor: 3934 case Sema::CXXMoveConstructor: 3935 // For copy or move constructors, we need to perform overload resolution. 3936 break; 3937 3938 case Sema::CXXCopyAssignment: 3939 case Sema::CXXMoveAssignment: 3940 case Sema::CXXDestructor: 3941 case Sema::CXXInvalid: 3942 return false; 3943 } 3944 3945 // -- if the class is a non-empty union, or for each non-empty anonymous 3946 // union member of a non-union class, exactly one non-static data member 3947 // shall be initialized; [DR1359] 3948 // 3949 // If we squint, this is guaranteed, since exactly one non-static data member 3950 // will be initialized (if the constructor isn't deleted), we just don't know 3951 // which one. 3952 if (ClassDecl->isUnion()) 3953 return true; 3954 3955 // -- the class shall not have any virtual base classes; 3956 if (ClassDecl->getNumVBases()) 3957 return false; 3958 3959 // -- every constructor involved in initializing [...] base class 3960 // sub-objects shall be a constexpr constructor; 3961 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 3962 BEnd = ClassDecl->bases_end(); 3963 B != BEnd; ++B) { 3964 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 3965 if (!BaseType) continue; 3966 3967 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 3968 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 3969 return false; 3970 } 3971 3972 // -- every constructor involved in initializing non-static data members 3973 // [...] shall be a constexpr constructor; 3974 // -- every non-static data member and base class sub-object shall be 3975 // initialized 3976 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 3977 FEnd = ClassDecl->field_end(); 3978 F != FEnd; ++F) { 3979 if (F->isInvalidDecl()) 3980 continue; 3981 if (const RecordType *RecordTy = 3982 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 3983 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 3984 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 3985 return false; 3986 } 3987 } 3988 3989 // All OK, it's constexpr! 3990 return true; 3991 } 3992 3993 static Sema::ImplicitExceptionSpecification 3994 computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 3995 switch (S.getSpecialMember(MD)) { 3996 case Sema::CXXDefaultConstructor: 3997 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 3998 case Sema::CXXCopyConstructor: 3999 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 4000 case Sema::CXXCopyAssignment: 4001 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 4002 case Sema::CXXMoveConstructor: 4003 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 4004 case Sema::CXXMoveAssignment: 4005 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 4006 case Sema::CXXDestructor: 4007 return S.ComputeDefaultedDtorExceptionSpec(MD); 4008 case Sema::CXXInvalid: 4009 break; 4010 } 4011 llvm_unreachable("only special members have implicit exception specs"); 4012 } 4013 4014 static void 4015 updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4016 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4017 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4018 ExceptSpec.getEPI(EPI); 4019 const FunctionProtoType *NewFPT = cast<FunctionProtoType>( 4020 S.Context.getFunctionType(FPT->getResultType(), FPT->arg_type_begin(), 4021 FPT->getNumArgs(), EPI)); 4022 FD->setType(QualType(NewFPT, 0)); 4023 } 4024 4025 void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4026 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4027 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4028 return; 4029 4030 // Evaluate the exception specification. 4031 ImplicitExceptionSpecification ExceptSpec = 4032 computeImplicitExceptionSpec(*this, Loc, MD); 4033 4034 // Update the type of the special member to use it. 4035 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4036 4037 // A user-provided destructor can be defined outside the class. When that 4038 // happens, be sure to update the exception specification on both 4039 // declarations. 4040 const FunctionProtoType *CanonicalFPT = 4041 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4042 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4043 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4044 CanonicalFPT, ExceptSpec); 4045 } 4046 4047 static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl); 4048 static bool isImplicitCopyAssignmentArgConst(Sema &S, CXXRecordDecl *ClassDecl); 4049 4050 void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4051 CXXRecordDecl *RD = MD->getParent(); 4052 CXXSpecialMember CSM = getSpecialMember(MD); 4053 4054 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4055 "not an explicitly-defaulted special member"); 4056 4057 // Whether this was the first-declared instance of the constructor. 4058 // This affects whether we implicitly add an exception spec and constexpr. 4059 bool First = MD == MD->getCanonicalDecl(); 4060 4061 bool HadError = false; 4062 4063 // C++11 [dcl.fct.def.default]p1: 4064 // A function that is explicitly defaulted shall 4065 // -- be a special member function (checked elsewhere), 4066 // -- have the same type (except for ref-qualifiers, and except that a 4067 // copy operation can take a non-const reference) as an implicit 4068 // declaration, and 4069 // -- not have default arguments. 4070 unsigned ExpectedParams = 1; 4071 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4072 ExpectedParams = 0; 4073 if (MD->getNumParams() != ExpectedParams) { 4074 // This also checks for default arguments: a copy or move constructor with a 4075 // default argument is classified as a default constructor, and assignment 4076 // operations and destructors can't have default arguments. 4077 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4078 << CSM << MD->getSourceRange(); 4079 HadError = true; 4080 } 4081 4082 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4083 4084 // Compute argument constness, constexpr, and triviality. 4085 bool CanHaveConstParam = false; 4086 bool Trivial; 4087 switch (CSM) { 4088 case CXXDefaultConstructor: 4089 Trivial = RD->hasTrivialDefaultConstructor(); 4090 break; 4091 case CXXCopyConstructor: 4092 CanHaveConstParam = isImplicitCopyCtorArgConst(*this, RD); 4093 Trivial = RD->hasTrivialCopyConstructor(); 4094 break; 4095 case CXXCopyAssignment: 4096 CanHaveConstParam = isImplicitCopyAssignmentArgConst(*this, RD); 4097 Trivial = RD->hasTrivialCopyAssignment(); 4098 break; 4099 case CXXMoveConstructor: 4100 Trivial = RD->hasTrivialMoveConstructor(); 4101 break; 4102 case CXXMoveAssignment: 4103 Trivial = RD->hasTrivialMoveAssignment(); 4104 break; 4105 case CXXDestructor: 4106 Trivial = RD->hasTrivialDestructor(); 4107 break; 4108 case CXXInvalid: 4109 llvm_unreachable("non-special member explicitly defaulted!"); 4110 } 4111 4112 QualType ReturnType = Context.VoidTy; 4113 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4114 // Check for return type matching. 4115 ReturnType = Type->getResultType(); 4116 QualType ExpectedReturnType = 4117 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4118 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4119 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4120 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4121 HadError = true; 4122 } 4123 4124 // A defaulted special member cannot have cv-qualifiers. 4125 if (Type->getTypeQuals()) { 4126 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4127 << (CSM == CXXMoveAssignment); 4128 HadError = true; 4129 } 4130 } 4131 4132 // Check for parameter type matching. 4133 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4134 bool HasConstParam = false; 4135 if (ExpectedParams && ArgType->isReferenceType()) { 4136 // Argument must be reference to possibly-const T. 4137 QualType ReferentType = ArgType->getPointeeType(); 4138 HasConstParam = ReferentType.isConstQualified(); 4139 4140 if (ReferentType.isVolatileQualified()) { 4141 Diag(MD->getLocation(), 4142 diag::err_defaulted_special_member_volatile_param) << CSM; 4143 HadError = true; 4144 } 4145 4146 if (HasConstParam && !CanHaveConstParam) { 4147 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4148 Diag(MD->getLocation(), 4149 diag::err_defaulted_special_member_copy_const_param) 4150 << (CSM == CXXCopyAssignment); 4151 // FIXME: Explain why this special member can't be const. 4152 } else { 4153 Diag(MD->getLocation(), 4154 diag::err_defaulted_special_member_move_const_param) 4155 << (CSM == CXXMoveAssignment); 4156 } 4157 HadError = true; 4158 } 4159 4160 // If a function is explicitly defaulted on its first declaration, it shall 4161 // have the same parameter type as if it had been implicitly declared. 4162 // (Presumably this is to prevent it from being trivial?) 4163 if (!HasConstParam && CanHaveConstParam && First) 4164 Diag(MD->getLocation(), 4165 diag::err_defaulted_special_member_copy_non_const_param) 4166 << (CSM == CXXCopyAssignment); 4167 } else if (ExpectedParams) { 4168 // A copy assignment operator can take its argument by value, but a 4169 // defaulted one cannot. 4170 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4171 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4172 HadError = true; 4173 } 4174 4175 // Rebuild the type with the implicit exception specification added, if we 4176 // are going to need it. 4177 const FunctionProtoType *ImplicitType = 0; 4178 if (First || Type->hasExceptionSpec()) { 4179 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4180 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4181 ImplicitType = cast<FunctionProtoType>( 4182 Context.getFunctionType(ReturnType, &ArgType, ExpectedParams, EPI)); 4183 } 4184 4185 // C++11 [dcl.fct.def.default]p2: 4186 // An explicitly-defaulted function may be declared constexpr only if it 4187 // would have been implicitly declared as constexpr, 4188 // Do not apply this rule to members of class templates, since core issue 1358 4189 // makes such functions always instantiate to constexpr functions. For 4190 // non-constructors, this is checked elsewhere. 4191 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4192 HasConstParam); 4193 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr && 4194 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4195 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4196 // FIXME: Explain why the constructor can't be constexpr. 4197 HadError = true; 4198 } 4199 // and may have an explicit exception-specification only if it is compatible 4200 // with the exception-specification on the implicit declaration. 4201 if (Type->hasExceptionSpec() && 4202 CheckEquivalentExceptionSpec( 4203 PDiag(diag::err_incorrect_defaulted_exception_spec) << CSM, 4204 PDiag(), ImplicitType, SourceLocation(), Type, MD->getLocation())) 4205 HadError = true; 4206 4207 // If a function is explicitly defaulted on its first declaration, 4208 if (First) { 4209 // -- it is implicitly considered to be constexpr if the implicit 4210 // definition would be, 4211 MD->setConstexpr(Constexpr); 4212 4213 // -- it is implicitly considered to have the same exception-specification 4214 // as if it had been implicitly declared, 4215 MD->setType(QualType(ImplicitType, 0)); 4216 4217 // Such a function is also trivial if the implicitly-declared function 4218 // would have been. 4219 MD->setTrivial(Trivial); 4220 } 4221 4222 if (ShouldDeleteSpecialMember(MD, CSM)) { 4223 if (First) { 4224 MD->setDeletedAsWritten(); 4225 } else { 4226 // C++11 [dcl.fct.def.default]p4: 4227 // [For a] user-provided explicitly-defaulted function [...] if such a 4228 // function is implicitly defined as deleted, the program is ill-formed. 4229 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4230 HadError = true; 4231 } 4232 } 4233 4234 if (HadError) 4235 MD->setInvalidDecl(); 4236 } 4237 4238 namespace { 4239 struct SpecialMemberDeletionInfo { 4240 Sema &S; 4241 CXXMethodDecl *MD; 4242 Sema::CXXSpecialMember CSM; 4243 bool Diagnose; 4244 4245 // Properties of the special member, computed for convenience. 4246 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4247 SourceLocation Loc; 4248 4249 bool AllFieldsAreConst; 4250 4251 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4252 Sema::CXXSpecialMember CSM, bool Diagnose) 4253 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4254 IsConstructor(false), IsAssignment(false), IsMove(false), 4255 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4256 AllFieldsAreConst(true) { 4257 switch (CSM) { 4258 case Sema::CXXDefaultConstructor: 4259 case Sema::CXXCopyConstructor: 4260 IsConstructor = true; 4261 break; 4262 case Sema::CXXMoveConstructor: 4263 IsConstructor = true; 4264 IsMove = true; 4265 break; 4266 case Sema::CXXCopyAssignment: 4267 IsAssignment = true; 4268 break; 4269 case Sema::CXXMoveAssignment: 4270 IsAssignment = true; 4271 IsMove = true; 4272 break; 4273 case Sema::CXXDestructor: 4274 break; 4275 case Sema::CXXInvalid: 4276 llvm_unreachable("invalid special member kind"); 4277 } 4278 4279 if (MD->getNumParams()) { 4280 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4281 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4282 } 4283 } 4284 4285 bool inUnion() const { return MD->getParent()->isUnion(); } 4286 4287 /// Look up the corresponding special member in the given class. 4288 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4289 unsigned Quals) { 4290 unsigned TQ = MD->getTypeQualifiers(); 4291 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4292 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4293 Quals = 0; 4294 return S.LookupSpecialMember(Class, CSM, 4295 ConstArg || (Quals & Qualifiers::Const), 4296 VolatileArg || (Quals & Qualifiers::Volatile), 4297 MD->getRefQualifier() == RQ_RValue, 4298 TQ & Qualifiers::Const, 4299 TQ & Qualifiers::Volatile); 4300 } 4301 4302 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4303 4304 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4305 bool shouldDeleteForField(FieldDecl *FD); 4306 bool shouldDeleteForAllConstMembers(); 4307 4308 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4309 unsigned Quals); 4310 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4311 Sema::SpecialMemberOverloadResult *SMOR, 4312 bool IsDtorCallInCtor); 4313 4314 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4315 }; 4316 } 4317 4318 /// Is the given special member inaccessible when used on the given 4319 /// sub-object. 4320 bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4321 CXXMethodDecl *target) { 4322 /// If we're operating on a base class, the object type is the 4323 /// type of this special member. 4324 QualType objectTy; 4325 AccessSpecifier access = target->getAccess(); 4326 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4327 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4328 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4329 4330 // If we're operating on a field, the object type is the type of the field. 4331 } else { 4332 objectTy = S.Context.getTypeDeclType(target->getParent()); 4333 } 4334 4335 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4336 } 4337 4338 /// Check whether we should delete a special member due to the implicit 4339 /// definition containing a call to a special member of a subobject. 4340 bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4341 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4342 bool IsDtorCallInCtor) { 4343 CXXMethodDecl *Decl = SMOR->getMethod(); 4344 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4345 4346 int DiagKind = -1; 4347 4348 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4349 DiagKind = !Decl ? 0 : 1; 4350 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4351 DiagKind = 2; 4352 else if (!isAccessible(Subobj, Decl)) 4353 DiagKind = 3; 4354 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4355 !Decl->isTrivial()) { 4356 // A member of a union must have a trivial corresponding special member. 4357 // As a weird special case, a destructor call from a union's constructor 4358 // must be accessible and non-deleted, but need not be trivial. Such a 4359 // destructor is never actually called, but is semantically checked as 4360 // if it were. 4361 DiagKind = 4; 4362 } 4363 4364 if (DiagKind == -1) 4365 return false; 4366 4367 if (Diagnose) { 4368 if (Field) { 4369 S.Diag(Field->getLocation(), 4370 diag::note_deleted_special_member_class_subobject) 4371 << CSM << MD->getParent() << /*IsField*/true 4372 << Field << DiagKind << IsDtorCallInCtor; 4373 } else { 4374 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4375 S.Diag(Base->getLocStart(), 4376 diag::note_deleted_special_member_class_subobject) 4377 << CSM << MD->getParent() << /*IsField*/false 4378 << Base->getType() << DiagKind << IsDtorCallInCtor; 4379 } 4380 4381 if (DiagKind == 1) 4382 S.NoteDeletedFunction(Decl); 4383 // FIXME: Explain inaccessibility if DiagKind == 3. 4384 } 4385 4386 return true; 4387 } 4388 4389 /// Check whether we should delete a special member function due to having a 4390 /// direct or virtual base class or non-static data member of class type M. 4391 bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4392 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 4393 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4394 4395 // C++11 [class.ctor]p5: 4396 // -- any direct or virtual base class, or non-static data member with no 4397 // brace-or-equal-initializer, has class type M (or array thereof) and 4398 // either M has no default constructor or overload resolution as applied 4399 // to M's default constructor results in an ambiguity or in a function 4400 // that is deleted or inaccessible 4401 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4402 // -- a direct or virtual base class B that cannot be copied/moved because 4403 // overload resolution, as applied to B's corresponding special member, 4404 // results in an ambiguity or a function that is deleted or inaccessible 4405 // from the defaulted special member 4406 // C++11 [class.dtor]p5: 4407 // -- any direct or virtual base class [...] has a type with a destructor 4408 // that is deleted or inaccessible 4409 if (!(CSM == Sema::CXXDefaultConstructor && 4410 Field && Field->hasInClassInitializer()) && 4411 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 4412 return true; 4413 4414 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4415 // -- any direct or virtual base class or non-static data member has a 4416 // type with a destructor that is deleted or inaccessible 4417 if (IsConstructor) { 4418 Sema::SpecialMemberOverloadResult *SMOR = 4419 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4420 false, false, false, false, false); 4421 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4422 return true; 4423 } 4424 4425 return false; 4426 } 4427 4428 /// Check whether we should delete a special member function due to the class 4429 /// having a particular direct or virtual base class. 4430 bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4431 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4432 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 4433 } 4434 4435 /// Check whether we should delete a special member function due to the class 4436 /// having a particular non-static data member. 4437 bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4438 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4439 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4440 4441 if (CSM == Sema::CXXDefaultConstructor) { 4442 // For a default constructor, all references must be initialized in-class 4443 // and, if a union, it must have a non-const member. 4444 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4445 if (Diagnose) 4446 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4447 << MD->getParent() << FD << FieldType << /*Reference*/0; 4448 return true; 4449 } 4450 // C++11 [class.ctor]p5: any non-variant non-static data member of 4451 // const-qualified type (or array thereof) with no 4452 // brace-or-equal-initializer does not have a user-provided default 4453 // constructor. 4454 if (!inUnion() && FieldType.isConstQualified() && 4455 !FD->hasInClassInitializer() && 4456 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4457 if (Diagnose) 4458 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4459 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4460 return true; 4461 } 4462 4463 if (inUnion() && !FieldType.isConstQualified()) 4464 AllFieldsAreConst = false; 4465 } else if (CSM == Sema::CXXCopyConstructor) { 4466 // For a copy constructor, data members must not be of rvalue reference 4467 // type. 4468 if (FieldType->isRValueReferenceType()) { 4469 if (Diagnose) 4470 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4471 << MD->getParent() << FD << FieldType; 4472 return true; 4473 } 4474 } else if (IsAssignment) { 4475 // For an assignment operator, data members must not be of reference type. 4476 if (FieldType->isReferenceType()) { 4477 if (Diagnose) 4478 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4479 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4480 return true; 4481 } 4482 if (!FieldRecord && FieldType.isConstQualified()) { 4483 // C++11 [class.copy]p23: 4484 // -- a non-static data member of const non-class type (or array thereof) 4485 if (Diagnose) 4486 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4487 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4488 return true; 4489 } 4490 } 4491 4492 if (FieldRecord) { 4493 // Some additional restrictions exist on the variant members. 4494 if (!inUnion() && FieldRecord->isUnion() && 4495 FieldRecord->isAnonymousStructOrUnion()) { 4496 bool AllVariantFieldsAreConst = true; 4497 4498 // FIXME: Handle anonymous unions declared within anonymous unions. 4499 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4500 UE = FieldRecord->field_end(); 4501 UI != UE; ++UI) { 4502 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4503 4504 if (!UnionFieldType.isConstQualified()) 4505 AllVariantFieldsAreConst = false; 4506 4507 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4508 if (UnionFieldRecord && 4509 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 4510 UnionFieldType.getCVRQualifiers())) 4511 return true; 4512 } 4513 4514 // At least one member in each anonymous union must be non-const 4515 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4516 FieldRecord->field_begin() != FieldRecord->field_end()) { 4517 if (Diagnose) 4518 S.Diag(FieldRecord->getLocation(), 4519 diag::note_deleted_default_ctor_all_const) 4520 << MD->getParent() << /*anonymous union*/1; 4521 return true; 4522 } 4523 4524 // Don't check the implicit member of the anonymous union type. 4525 // This is technically non-conformant, but sanity demands it. 4526 return false; 4527 } 4528 4529 if (shouldDeleteForClassSubobject(FieldRecord, FD, 4530 FieldType.getCVRQualifiers())) 4531 return true; 4532 } 4533 4534 return false; 4535 } 4536 4537 /// C++11 [class.ctor] p5: 4538 /// A defaulted default constructor for a class X is defined as deleted if 4539 /// X is a union and all of its variant members are of const-qualified type. 4540 bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4541 // This is a silly definition, because it gives an empty union a deleted 4542 // default constructor. Don't do that. 4543 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4544 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4545 if (Diagnose) 4546 S.Diag(MD->getParent()->getLocation(), 4547 diag::note_deleted_default_ctor_all_const) 4548 << MD->getParent() << /*not anonymous union*/0; 4549 return true; 4550 } 4551 return false; 4552 } 4553 4554 /// Determine whether a defaulted special member function should be defined as 4555 /// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4556 /// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4557 bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4558 bool Diagnose) { 4559 if (MD->isInvalidDecl()) 4560 return false; 4561 CXXRecordDecl *RD = MD->getParent(); 4562 assert(!RD->isDependentType() && "do deletion after instantiation"); 4563 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4564 return false; 4565 4566 // C++11 [expr.lambda.prim]p19: 4567 // The closure type associated with a lambda-expression has a 4568 // deleted (8.4.3) default constructor and a deleted copy 4569 // assignment operator. 4570 if (RD->isLambda() && 4571 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4572 if (Diagnose) 4573 Diag(RD->getLocation(), diag::note_lambda_decl); 4574 return true; 4575 } 4576 4577 // For an anonymous struct or union, the copy and assignment special members 4578 // will never be used, so skip the check. For an anonymous union declared at 4579 // namespace scope, the constructor and destructor are used. 4580 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4581 RD->isAnonymousStructOrUnion()) 4582 return false; 4583 4584 // C++11 [class.copy]p7, p18: 4585 // If the class definition declares a move constructor or move assignment 4586 // operator, an implicitly declared copy constructor or copy assignment 4587 // operator is defined as deleted. 4588 if (MD->isImplicit() && 4589 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4590 CXXMethodDecl *UserDeclaredMove = 0; 4591 4592 // In Microsoft mode, a user-declared move only causes the deletion of the 4593 // corresponding copy operation, not both copy operations. 4594 if (RD->hasUserDeclaredMoveConstructor() && 4595 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4596 if (!Diagnose) return true; 4597 UserDeclaredMove = RD->getMoveConstructor(); 4598 assert(UserDeclaredMove); 4599 } else if (RD->hasUserDeclaredMoveAssignment() && 4600 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4601 if (!Diagnose) return true; 4602 UserDeclaredMove = RD->getMoveAssignmentOperator(); 4603 assert(UserDeclaredMove); 4604 } 4605 4606 if (UserDeclaredMove) { 4607 Diag(UserDeclaredMove->getLocation(), 4608 diag::note_deleted_copy_user_declared_move) 4609 << (CSM == CXXCopyAssignment) << RD 4610 << UserDeclaredMove->isMoveAssignmentOperator(); 4611 return true; 4612 } 4613 } 4614 4615 // Do access control from the special member function 4616 ContextRAII MethodContext(*this, MD); 4617 4618 // C++11 [class.dtor]p5: 4619 // -- for a virtual destructor, lookup of the non-array deallocation function 4620 // results in an ambiguity or in a function that is deleted or inaccessible 4621 if (CSM == CXXDestructor && MD->isVirtual()) { 4622 FunctionDecl *OperatorDelete = 0; 4623 DeclarationName Name = 4624 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4625 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4626 OperatorDelete, false)) { 4627 if (Diagnose) 4628 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4629 return true; 4630 } 4631 } 4632 4633 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4634 4635 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4636 BE = RD->bases_end(); BI != BE; ++BI) 4637 if (!BI->isVirtual() && 4638 SMI.shouldDeleteForBase(BI)) 4639 return true; 4640 4641 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4642 BE = RD->vbases_end(); BI != BE; ++BI) 4643 if (SMI.shouldDeleteForBase(BI)) 4644 return true; 4645 4646 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4647 FE = RD->field_end(); FI != FE; ++FI) 4648 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4649 SMI.shouldDeleteForField(*FI)) 4650 return true; 4651 4652 if (SMI.shouldDeleteForAllConstMembers()) 4653 return true; 4654 4655 return false; 4656 } 4657 4658 /// \brief Data used with FindHiddenVirtualMethod 4659 namespace { 4660 struct FindHiddenVirtualMethodData { 4661 Sema *S; 4662 CXXMethodDecl *Method; 4663 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4664 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4665 }; 4666 } 4667 4668 /// \brief Member lookup function that determines whether a given C++ 4669 /// method overloads virtual methods in a base class without overriding any, 4670 /// to be used with CXXRecordDecl::lookupInBases(). 4671 static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4672 CXXBasePath &Path, 4673 void *UserData) { 4674 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4675 4676 FindHiddenVirtualMethodData &Data 4677 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4678 4679 DeclarationName Name = Data.Method->getDeclName(); 4680 assert(Name.getNameKind() == DeclarationName::Identifier); 4681 4682 bool foundSameNameMethod = false; 4683 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4684 for (Path.Decls = BaseRecord->lookup(Name); 4685 Path.Decls.first != Path.Decls.second; 4686 ++Path.Decls.first) { 4687 NamedDecl *D = *Path.Decls.first; 4688 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4689 MD = MD->getCanonicalDecl(); 4690 foundSameNameMethod = true; 4691 // Interested only in hidden virtual methods. 4692 if (!MD->isVirtual()) 4693 continue; 4694 // If the method we are checking overrides a method from its base 4695 // don't warn about the other overloaded methods. 4696 if (!Data.S->IsOverload(Data.Method, MD, false)) 4697 return true; 4698 // Collect the overload only if its hidden. 4699 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4700 overloadedMethods.push_back(MD); 4701 } 4702 } 4703 4704 if (foundSameNameMethod) 4705 Data.OverloadedMethods.append(overloadedMethods.begin(), 4706 overloadedMethods.end()); 4707 return foundSameNameMethod; 4708 } 4709 4710 /// \brief See if a method overloads virtual methods in a base class without 4711 /// overriding any. 4712 void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4713 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4714 MD->getLocation()) == DiagnosticsEngine::Ignored) 4715 return; 4716 if (!MD->getDeclName().isIdentifier()) 4717 return; 4718 4719 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4720 /*bool RecordPaths=*/false, 4721 /*bool DetectVirtual=*/false); 4722 FindHiddenVirtualMethodData Data; 4723 Data.Method = MD; 4724 Data.S = this; 4725 4726 // Keep the base methods that were overriden or introduced in the subclass 4727 // by 'using' in a set. A base method not in this set is hidden. 4728 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4729 res.first != res.second; ++res.first) { 4730 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4731 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4732 E = MD->end_overridden_methods(); 4733 I != E; ++I) 4734 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4735 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4736 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4737 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4738 } 4739 4740 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4741 !Data.OverloadedMethods.empty()) { 4742 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4743 << MD << (Data.OverloadedMethods.size() > 1); 4744 4745 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4746 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4747 Diag(overloadedMD->getLocation(), 4748 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4749 } 4750 } 4751 } 4752 4753 void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4754 Decl *TagDecl, 4755 SourceLocation LBrac, 4756 SourceLocation RBrac, 4757 AttributeList *AttrList) { 4758 if (!TagDecl) 4759 return; 4760 4761 AdjustDeclIfTemplate(TagDecl); 4762 4763 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 4764 if (l->getKind() != AttributeList::AT_Visibility) 4765 continue; 4766 l->setInvalid(); 4767 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 4768 l->getName(); 4769 } 4770 4771 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4772 // strict aliasing violation! 4773 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4774 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4775 4776 CheckCompletedCXXClass( 4777 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4778 } 4779 4780 /// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4781 /// special functions, such as the default constructor, copy 4782 /// constructor, or destructor, to the given C++ class (C++ 4783 /// [special]p1). This routine can only be executed just before the 4784 /// definition of the class is complete. 4785 void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4786 if (!ClassDecl->hasUserDeclaredConstructor()) 4787 ++ASTContext::NumImplicitDefaultConstructors; 4788 4789 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4790 ++ASTContext::NumImplicitCopyConstructors; 4791 4792 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4793 ++ASTContext::NumImplicitMoveConstructors; 4794 4795 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4796 ++ASTContext::NumImplicitCopyAssignmentOperators; 4797 4798 // If we have a dynamic class, then the copy assignment operator may be 4799 // virtual, so we have to declare it immediately. This ensures that, e.g., 4800 // it shows up in the right place in the vtable and that we diagnose 4801 // problems with the implicit exception specification. 4802 if (ClassDecl->isDynamicClass()) 4803 DeclareImplicitCopyAssignment(ClassDecl); 4804 } 4805 4806 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()) { 4807 ++ASTContext::NumImplicitMoveAssignmentOperators; 4808 4809 // Likewise for the move assignment operator. 4810 if (ClassDecl->isDynamicClass()) 4811 DeclareImplicitMoveAssignment(ClassDecl); 4812 } 4813 4814 if (!ClassDecl->hasUserDeclaredDestructor()) { 4815 ++ASTContext::NumImplicitDestructors; 4816 4817 // If we have a dynamic class, then the destructor may be virtual, so we 4818 // have to declare the destructor immediately. This ensures that, e.g., it 4819 // shows up in the right place in the vtable and that we diagnose problems 4820 // with the implicit exception specification. 4821 if (ClassDecl->isDynamicClass()) 4822 DeclareImplicitDestructor(ClassDecl); 4823 } 4824 } 4825 4826 void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4827 if (!D) 4828 return; 4829 4830 int NumParamList = D->getNumTemplateParameterLists(); 4831 for (int i = 0; i < NumParamList; i++) { 4832 TemplateParameterList* Params = D->getTemplateParameterList(i); 4833 for (TemplateParameterList::iterator Param = Params->begin(), 4834 ParamEnd = Params->end(); 4835 Param != ParamEnd; ++Param) { 4836 NamedDecl *Named = cast<NamedDecl>(*Param); 4837 if (Named->getDeclName()) { 4838 S->AddDecl(Named); 4839 IdResolver.AddDecl(Named); 4840 } 4841 } 4842 } 4843 } 4844 4845 void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4846 if (!D) 4847 return; 4848 4849 TemplateParameterList *Params = 0; 4850 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4851 Params = Template->getTemplateParameters(); 4852 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4853 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4854 Params = PartialSpec->getTemplateParameters(); 4855 else 4856 return; 4857 4858 for (TemplateParameterList::iterator Param = Params->begin(), 4859 ParamEnd = Params->end(); 4860 Param != ParamEnd; ++Param) { 4861 NamedDecl *Named = cast<NamedDecl>(*Param); 4862 if (Named->getDeclName()) { 4863 S->AddDecl(Named); 4864 IdResolver.AddDecl(Named); 4865 } 4866 } 4867 } 4868 4869 void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4870 if (!RecordD) return; 4871 AdjustDeclIfTemplate(RecordD); 4872 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4873 PushDeclContext(S, Record); 4874 } 4875 4876 void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4877 if (!RecordD) return; 4878 PopDeclContext(); 4879 } 4880 4881 /// ActOnStartDelayedCXXMethodDeclaration - We have completed 4882 /// parsing a top-level (non-nested) C++ class, and we are now 4883 /// parsing those parts of the given Method declaration that could 4884 /// not be parsed earlier (C++ [class.mem]p2), such as default 4885 /// arguments. This action should enter the scope of the given 4886 /// Method declaration as if we had just parsed the qualified method 4887 /// name. However, it should not bring the parameters into scope; 4888 /// that will be performed by ActOnDelayedCXXMethodParameter. 4889 void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4890 } 4891 4892 /// ActOnDelayedCXXMethodParameter - We've already started a delayed 4893 /// C++ method declaration. We're (re-)introducing the given 4894 /// function parameter into scope for use in parsing later parts of 4895 /// the method declaration. For example, we could see an 4896 /// ActOnParamDefaultArgument event for this parameter. 4897 void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4898 if (!ParamD) 4899 return; 4900 4901 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4902 4903 // If this parameter has an unparsed default argument, clear it out 4904 // to make way for the parsed default argument. 4905 if (Param->hasUnparsedDefaultArg()) 4906 Param->setDefaultArg(0); 4907 4908 S->AddDecl(Param); 4909 if (Param->getDeclName()) 4910 IdResolver.AddDecl(Param); 4911 } 4912 4913 /// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4914 /// processing the delayed method declaration for Method. The method 4915 /// declaration is now considered finished. There may be a separate 4916 /// ActOnStartOfFunctionDef action later (not necessarily 4917 /// immediately!) for this method, if it was also defined inside the 4918 /// class body. 4919 void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4920 if (!MethodD) 4921 return; 4922 4923 AdjustDeclIfTemplate(MethodD); 4924 4925 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4926 4927 // Now that we have our default arguments, check the constructor 4928 // again. It could produce additional diagnostics or affect whether 4929 // the class has implicitly-declared destructors, among other 4930 // things. 4931 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4932 CheckConstructor(Constructor); 4933 4934 // Check the default arguments, which we may have added. 4935 if (!Method->isInvalidDecl()) 4936 CheckCXXDefaultArguments(Method); 4937 } 4938 4939 /// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4940 /// the well-formedness of the constructor declarator @p D with type @p 4941 /// R. If there are any errors in the declarator, this routine will 4942 /// emit diagnostics and set the invalid bit to true. In any case, the type 4943 /// will be updated to reflect a well-formed type for the constructor and 4944 /// returned. 4945 QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4946 StorageClass &SC) { 4947 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4948 4949 // C++ [class.ctor]p3: 4950 // A constructor shall not be virtual (10.3) or static (9.4). A 4951 // constructor can be invoked for a const, volatile or const 4952 // volatile object. A constructor shall not be declared const, 4953 // volatile, or const volatile (9.3.2). 4954 if (isVirtual) { 4955 if (!D.isInvalidType()) 4956 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4957 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4958 << SourceRange(D.getIdentifierLoc()); 4959 D.setInvalidType(); 4960 } 4961 if (SC == SC_Static) { 4962 if (!D.isInvalidType()) 4963 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4964 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4965 << SourceRange(D.getIdentifierLoc()); 4966 D.setInvalidType(); 4967 SC = SC_None; 4968 } 4969 4970 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4971 if (FTI.TypeQuals != 0) { 4972 if (FTI.TypeQuals & Qualifiers::Const) 4973 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4974 << "const" << SourceRange(D.getIdentifierLoc()); 4975 if (FTI.TypeQuals & Qualifiers::Volatile) 4976 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4977 << "volatile" << SourceRange(D.getIdentifierLoc()); 4978 if (FTI.TypeQuals & Qualifiers::Restrict) 4979 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4980 << "restrict" << SourceRange(D.getIdentifierLoc()); 4981 D.setInvalidType(); 4982 } 4983 4984 // C++0x [class.ctor]p4: 4985 // A constructor shall not be declared with a ref-qualifier. 4986 if (FTI.hasRefQualifier()) { 4987 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4988 << FTI.RefQualifierIsLValueRef 4989 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4990 D.setInvalidType(); 4991 } 4992 4993 // Rebuild the function type "R" without any type qualifiers (in 4994 // case any of the errors above fired) and with "void" as the 4995 // return type, since constructors don't have return types. 4996 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4997 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4998 return R; 4999 5000 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5001 EPI.TypeQuals = 0; 5002 EPI.RefQualifier = RQ_None; 5003 5004 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5005 Proto->getNumArgs(), EPI); 5006 } 5007 5008 /// CheckConstructor - Checks a fully-formed constructor for 5009 /// well-formedness, issuing any diagnostics required. Returns true if 5010 /// the constructor declarator is invalid. 5011 void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5012 CXXRecordDecl *ClassDecl 5013 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5014 if (!ClassDecl) 5015 return Constructor->setInvalidDecl(); 5016 5017 // C++ [class.copy]p3: 5018 // A declaration of a constructor for a class X is ill-formed if 5019 // its first parameter is of type (optionally cv-qualified) X and 5020 // either there are no other parameters or else all other 5021 // parameters have default arguments. 5022 if (!Constructor->isInvalidDecl() && 5023 ((Constructor->getNumParams() == 1) || 5024 (Constructor->getNumParams() > 1 && 5025 Constructor->getParamDecl(1)->hasDefaultArg())) && 5026 Constructor->getTemplateSpecializationKind() 5027 != TSK_ImplicitInstantiation) { 5028 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5029 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5030 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5031 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5032 const char *ConstRef 5033 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5034 : " const &"; 5035 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5036 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5037 5038 // FIXME: Rather that making the constructor invalid, we should endeavor 5039 // to fix the type. 5040 Constructor->setInvalidDecl(); 5041 } 5042 } 5043 } 5044 5045 /// CheckDestructor - Checks a fully-formed destructor definition for 5046 /// well-formedness, issuing any diagnostics required. Returns true 5047 /// on error. 5048 bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5049 CXXRecordDecl *RD = Destructor->getParent(); 5050 5051 if (Destructor->isVirtual()) { 5052 SourceLocation Loc; 5053 5054 if (!Destructor->isImplicit()) 5055 Loc = Destructor->getLocation(); 5056 else 5057 Loc = RD->getLocation(); 5058 5059 // If we have a virtual destructor, look up the deallocation function 5060 FunctionDecl *OperatorDelete = 0; 5061 DeclarationName Name = 5062 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5063 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5064 return true; 5065 5066 MarkFunctionReferenced(Loc, OperatorDelete); 5067 5068 Destructor->setOperatorDelete(OperatorDelete); 5069 } 5070 5071 return false; 5072 } 5073 5074 static inline bool 5075 FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5076 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5077 FTI.ArgInfo[0].Param && 5078 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5079 } 5080 5081 /// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5082 /// the well-formednes of the destructor declarator @p D with type @p 5083 /// R. If there are any errors in the declarator, this routine will 5084 /// emit diagnostics and set the declarator to invalid. Even if this happens, 5085 /// will be updated to reflect a well-formed type for the destructor and 5086 /// returned. 5087 QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5088 StorageClass& SC) { 5089 // C++ [class.dtor]p1: 5090 // [...] A typedef-name that names a class is a class-name 5091 // (7.1.3); however, a typedef-name that names a class shall not 5092 // be used as the identifier in the declarator for a destructor 5093 // declaration. 5094 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5095 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5096 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5097 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5098 else if (const TemplateSpecializationType *TST = 5099 DeclaratorType->getAs<TemplateSpecializationType>()) 5100 if (TST->isTypeAlias()) 5101 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5102 << DeclaratorType << 1; 5103 5104 // C++ [class.dtor]p2: 5105 // A destructor is used to destroy objects of its class type. A 5106 // destructor takes no parameters, and no return type can be 5107 // specified for it (not even void). The address of a destructor 5108 // shall not be taken. A destructor shall not be static. A 5109 // destructor can be invoked for a const, volatile or const 5110 // volatile object. A destructor shall not be declared const, 5111 // volatile or const volatile (9.3.2). 5112 if (SC == SC_Static) { 5113 if (!D.isInvalidType()) 5114 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5115 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5116 << SourceRange(D.getIdentifierLoc()) 5117 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5118 5119 SC = SC_None; 5120 } 5121 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5122 // Destructors don't have return types, but the parser will 5123 // happily parse something like: 5124 // 5125 // class X { 5126 // float ~X(); 5127 // }; 5128 // 5129 // The return type will be eliminated later. 5130 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5131 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5132 << SourceRange(D.getIdentifierLoc()); 5133 } 5134 5135 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5136 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5137 if (FTI.TypeQuals & Qualifiers::Const) 5138 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5139 << "const" << SourceRange(D.getIdentifierLoc()); 5140 if (FTI.TypeQuals & Qualifiers::Volatile) 5141 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5142 << "volatile" << SourceRange(D.getIdentifierLoc()); 5143 if (FTI.TypeQuals & Qualifiers::Restrict) 5144 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5145 << "restrict" << SourceRange(D.getIdentifierLoc()); 5146 D.setInvalidType(); 5147 } 5148 5149 // C++0x [class.dtor]p2: 5150 // A destructor shall not be declared with a ref-qualifier. 5151 if (FTI.hasRefQualifier()) { 5152 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5153 << FTI.RefQualifierIsLValueRef 5154 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5155 D.setInvalidType(); 5156 } 5157 5158 // Make sure we don't have any parameters. 5159 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5160 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5161 5162 // Delete the parameters. 5163 FTI.freeArgs(); 5164 D.setInvalidType(); 5165 } 5166 5167 // Make sure the destructor isn't variadic. 5168 if (FTI.isVariadic) { 5169 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5170 D.setInvalidType(); 5171 } 5172 5173 // Rebuild the function type "R" without any type qualifiers or 5174 // parameters (in case any of the errors above fired) and with 5175 // "void" as the return type, since destructors don't have return 5176 // types. 5177 if (!D.isInvalidType()) 5178 return R; 5179 5180 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5181 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5182 EPI.Variadic = false; 5183 EPI.TypeQuals = 0; 5184 EPI.RefQualifier = RQ_None; 5185 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5186 } 5187 5188 /// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5189 /// well-formednes of the conversion function declarator @p D with 5190 /// type @p R. If there are any errors in the declarator, this routine 5191 /// will emit diagnostics and return true. Otherwise, it will return 5192 /// false. Either way, the type @p R will be updated to reflect a 5193 /// well-formed type for the conversion operator. 5194 void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5195 StorageClass& SC) { 5196 // C++ [class.conv.fct]p1: 5197 // Neither parameter types nor return type can be specified. The 5198 // type of a conversion function (8.3.5) is "function taking no 5199 // parameter returning conversion-type-id." 5200 if (SC == SC_Static) { 5201 if (!D.isInvalidType()) 5202 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5203 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5204 << SourceRange(D.getIdentifierLoc()); 5205 D.setInvalidType(); 5206 SC = SC_None; 5207 } 5208 5209 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5210 5211 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5212 // Conversion functions don't have return types, but the parser will 5213 // happily parse something like: 5214 // 5215 // class X { 5216 // float operator bool(); 5217 // }; 5218 // 5219 // The return type will be changed later anyway. 5220 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5221 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5222 << SourceRange(D.getIdentifierLoc()); 5223 D.setInvalidType(); 5224 } 5225 5226 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5227 5228 // Make sure we don't have any parameters. 5229 if (Proto->getNumArgs() > 0) { 5230 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5231 5232 // Delete the parameters. 5233 D.getFunctionTypeInfo().freeArgs(); 5234 D.setInvalidType(); 5235 } else if (Proto->isVariadic()) { 5236 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5237 D.setInvalidType(); 5238 } 5239 5240 // Diagnose "&operator bool()" and other such nonsense. This 5241 // is actually a gcc extension which we don't support. 5242 if (Proto->getResultType() != ConvType) { 5243 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5244 << Proto->getResultType(); 5245 D.setInvalidType(); 5246 ConvType = Proto->getResultType(); 5247 } 5248 5249 // C++ [class.conv.fct]p4: 5250 // The conversion-type-id shall not represent a function type nor 5251 // an array type. 5252 if (ConvType->isArrayType()) { 5253 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5254 ConvType = Context.getPointerType(ConvType); 5255 D.setInvalidType(); 5256 } else if (ConvType->isFunctionType()) { 5257 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5258 ConvType = Context.getPointerType(ConvType); 5259 D.setInvalidType(); 5260 } 5261 5262 // Rebuild the function type "R" without any parameters (in case any 5263 // of the errors above fired) and with the conversion type as the 5264 // return type. 5265 if (D.isInvalidType()) 5266 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5267 5268 // C++0x explicit conversion operators. 5269 if (D.getDeclSpec().isExplicitSpecified()) 5270 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5271 getLangOpts().CPlusPlus0x ? 5272 diag::warn_cxx98_compat_explicit_conversion_functions : 5273 diag::ext_explicit_conversion_functions) 5274 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5275 } 5276 5277 /// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5278 /// the declaration of the given C++ conversion function. This routine 5279 /// is responsible for recording the conversion function in the C++ 5280 /// class, if possible. 5281 Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5282 assert(Conversion && "Expected to receive a conversion function declaration"); 5283 5284 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5285 5286 // Make sure we aren't redeclaring the conversion function. 5287 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5288 5289 // C++ [class.conv.fct]p1: 5290 // [...] A conversion function is never used to convert a 5291 // (possibly cv-qualified) object to the (possibly cv-qualified) 5292 // same object type (or a reference to it), to a (possibly 5293 // cv-qualified) base class of that type (or a reference to it), 5294 // or to (possibly cv-qualified) void. 5295 // FIXME: Suppress this warning if the conversion function ends up being a 5296 // virtual function that overrides a virtual function in a base class. 5297 QualType ClassType 5298 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5299 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5300 ConvType = ConvTypeRef->getPointeeType(); 5301 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5302 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5303 /* Suppress diagnostics for instantiations. */; 5304 else if (ConvType->isRecordType()) { 5305 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5306 if (ConvType == ClassType) 5307 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5308 << ClassType; 5309 else if (IsDerivedFrom(ClassType, ConvType)) 5310 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5311 << ClassType << ConvType; 5312 } else if (ConvType->isVoidType()) { 5313 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5314 << ClassType << ConvType; 5315 } 5316 5317 if (FunctionTemplateDecl *ConversionTemplate 5318 = Conversion->getDescribedFunctionTemplate()) 5319 return ConversionTemplate; 5320 5321 return Conversion; 5322 } 5323 5324 //===----------------------------------------------------------------------===// 5325 // Namespace Handling 5326 //===----------------------------------------------------------------------===// 5327 5328 5329 5330 /// ActOnStartNamespaceDef - This is called at the start of a namespace 5331 /// definition. 5332 Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5333 SourceLocation InlineLoc, 5334 SourceLocation NamespaceLoc, 5335 SourceLocation IdentLoc, 5336 IdentifierInfo *II, 5337 SourceLocation LBrace, 5338 AttributeList *AttrList) { 5339 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5340 // For anonymous namespace, take the location of the left brace. 5341 SourceLocation Loc = II ? IdentLoc : LBrace; 5342 bool IsInline = InlineLoc.isValid(); 5343 bool IsInvalid = false; 5344 bool IsStd = false; 5345 bool AddToKnown = false; 5346 Scope *DeclRegionScope = NamespcScope->getParent(); 5347 5348 NamespaceDecl *PrevNS = 0; 5349 if (II) { 5350 // C++ [namespace.def]p2: 5351 // The identifier in an original-namespace-definition shall not 5352 // have been previously defined in the declarative region in 5353 // which the original-namespace-definition appears. The 5354 // identifier in an original-namespace-definition is the name of 5355 // the namespace. Subsequently in that declarative region, it is 5356 // treated as an original-namespace-name. 5357 // 5358 // Since namespace names are unique in their scope, and we don't 5359 // look through using directives, just look for any ordinary names. 5360 5361 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5362 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5363 Decl::IDNS_Namespace; 5364 NamedDecl *PrevDecl = 0; 5365 for (DeclContext::lookup_result R 5366 = CurContext->getRedeclContext()->lookup(II); 5367 R.first != R.second; ++R.first) { 5368 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5369 PrevDecl = *R.first; 5370 break; 5371 } 5372 } 5373 5374 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5375 5376 if (PrevNS) { 5377 // This is an extended namespace definition. 5378 if (IsInline != PrevNS->isInline()) { 5379 // inline-ness must match 5380 if (PrevNS->isInline()) { 5381 // The user probably just forgot the 'inline', so suggest that it 5382 // be added back. 5383 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5384 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5385 } else { 5386 Diag(Loc, diag::err_inline_namespace_mismatch) 5387 << IsInline; 5388 } 5389 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5390 5391 IsInline = PrevNS->isInline(); 5392 } 5393 } else if (PrevDecl) { 5394 // This is an invalid name redefinition. 5395 Diag(Loc, diag::err_redefinition_different_kind) 5396 << II; 5397 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5398 IsInvalid = true; 5399 // Continue on to push Namespc as current DeclContext and return it. 5400 } else if (II->isStr("std") && 5401 CurContext->getRedeclContext()->isTranslationUnit()) { 5402 // This is the first "real" definition of the namespace "std", so update 5403 // our cache of the "std" namespace to point at this definition. 5404 PrevNS = getStdNamespace(); 5405 IsStd = true; 5406 AddToKnown = !IsInline; 5407 } else { 5408 // We've seen this namespace for the first time. 5409 AddToKnown = !IsInline; 5410 } 5411 } else { 5412 // Anonymous namespaces. 5413 5414 // Determine whether the parent already has an anonymous namespace. 5415 DeclContext *Parent = CurContext->getRedeclContext(); 5416 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5417 PrevNS = TU->getAnonymousNamespace(); 5418 } else { 5419 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5420 PrevNS = ND->getAnonymousNamespace(); 5421 } 5422 5423 if (PrevNS && IsInline != PrevNS->isInline()) { 5424 // inline-ness must match 5425 Diag(Loc, diag::err_inline_namespace_mismatch) 5426 << IsInline; 5427 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5428 5429 // Recover by ignoring the new namespace's inline status. 5430 IsInline = PrevNS->isInline(); 5431 } 5432 } 5433 5434 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5435 StartLoc, Loc, II, PrevNS); 5436 if (IsInvalid) 5437 Namespc->setInvalidDecl(); 5438 5439 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5440 5441 // FIXME: Should we be merging attributes? 5442 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5443 PushNamespaceVisibilityAttr(Attr, Loc); 5444 5445 if (IsStd) 5446 StdNamespace = Namespc; 5447 if (AddToKnown) 5448 KnownNamespaces[Namespc] = false; 5449 5450 if (II) { 5451 PushOnScopeChains(Namespc, DeclRegionScope); 5452 } else { 5453 // Link the anonymous namespace into its parent. 5454 DeclContext *Parent = CurContext->getRedeclContext(); 5455 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5456 TU->setAnonymousNamespace(Namespc); 5457 } else { 5458 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5459 } 5460 5461 CurContext->addDecl(Namespc); 5462 5463 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5464 // behaves as if it were replaced by 5465 // namespace unique { /* empty body */ } 5466 // using namespace unique; 5467 // namespace unique { namespace-body } 5468 // where all occurrences of 'unique' in a translation unit are 5469 // replaced by the same identifier and this identifier differs 5470 // from all other identifiers in the entire program. 5471 5472 // We just create the namespace with an empty name and then add an 5473 // implicit using declaration, just like the standard suggests. 5474 // 5475 // CodeGen enforces the "universally unique" aspect by giving all 5476 // declarations semantically contained within an anonymous 5477 // namespace internal linkage. 5478 5479 if (!PrevNS) { 5480 UsingDirectiveDecl* UD 5481 = UsingDirectiveDecl::Create(Context, CurContext, 5482 /* 'using' */ LBrace, 5483 /* 'namespace' */ SourceLocation(), 5484 /* qualifier */ NestedNameSpecifierLoc(), 5485 /* identifier */ SourceLocation(), 5486 Namespc, 5487 /* Ancestor */ CurContext); 5488 UD->setImplicit(); 5489 CurContext->addDecl(UD); 5490 } 5491 } 5492 5493 ActOnDocumentableDecl(Namespc); 5494 5495 // Although we could have an invalid decl (i.e. the namespace name is a 5496 // redefinition), push it as current DeclContext and try to continue parsing. 5497 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5498 // for the namespace has the declarations that showed up in that particular 5499 // namespace definition. 5500 PushDeclContext(NamespcScope, Namespc); 5501 return Namespc; 5502 } 5503 5504 /// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5505 /// is a namespace alias, returns the namespace it points to. 5506 static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5507 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5508 return AD->getNamespace(); 5509 return dyn_cast_or_null<NamespaceDecl>(D); 5510 } 5511 5512 /// ActOnFinishNamespaceDef - This callback is called after a namespace is 5513 /// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5514 void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5515 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5516 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5517 Namespc->setRBraceLoc(RBrace); 5518 PopDeclContext(); 5519 if (Namespc->hasAttr<VisibilityAttr>()) 5520 PopPragmaVisibility(true, RBrace); 5521 } 5522 5523 CXXRecordDecl *Sema::getStdBadAlloc() const { 5524 return cast_or_null<CXXRecordDecl>( 5525 StdBadAlloc.get(Context.getExternalSource())); 5526 } 5527 5528 NamespaceDecl *Sema::getStdNamespace() const { 5529 return cast_or_null<NamespaceDecl>( 5530 StdNamespace.get(Context.getExternalSource())); 5531 } 5532 5533 /// \brief Retrieve the special "std" namespace, which may require us to 5534 /// implicitly define the namespace. 5535 NamespaceDecl *Sema::getOrCreateStdNamespace() { 5536 if (!StdNamespace) { 5537 // The "std" namespace has not yet been defined, so build one implicitly. 5538 StdNamespace = NamespaceDecl::Create(Context, 5539 Context.getTranslationUnitDecl(), 5540 /*Inline=*/false, 5541 SourceLocation(), SourceLocation(), 5542 &PP.getIdentifierTable().get("std"), 5543 /*PrevDecl=*/0); 5544 getStdNamespace()->setImplicit(true); 5545 } 5546 5547 return getStdNamespace(); 5548 } 5549 5550 bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5551 assert(getLangOpts().CPlusPlus && 5552 "Looking for std::initializer_list outside of C++."); 5553 5554 // We're looking for implicit instantiations of 5555 // template <typename E> class std::initializer_list. 5556 5557 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5558 return false; 5559 5560 ClassTemplateDecl *Template = 0; 5561 const TemplateArgument *Arguments = 0; 5562 5563 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5564 5565 ClassTemplateSpecializationDecl *Specialization = 5566 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5567 if (!Specialization) 5568 return false; 5569 5570 Template = Specialization->getSpecializedTemplate(); 5571 Arguments = Specialization->getTemplateArgs().data(); 5572 } else if (const TemplateSpecializationType *TST = 5573 Ty->getAs<TemplateSpecializationType>()) { 5574 Template = dyn_cast_or_null<ClassTemplateDecl>( 5575 TST->getTemplateName().getAsTemplateDecl()); 5576 Arguments = TST->getArgs(); 5577 } 5578 if (!Template) 5579 return false; 5580 5581 if (!StdInitializerList) { 5582 // Haven't recognized std::initializer_list yet, maybe this is it. 5583 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5584 if (TemplateClass->getIdentifier() != 5585 &PP.getIdentifierTable().get("initializer_list") || 5586 !getStdNamespace()->InEnclosingNamespaceSetOf( 5587 TemplateClass->getDeclContext())) 5588 return false; 5589 // This is a template called std::initializer_list, but is it the right 5590 // template? 5591 TemplateParameterList *Params = Template->getTemplateParameters(); 5592 if (Params->getMinRequiredArguments() != 1) 5593 return false; 5594 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5595 return false; 5596 5597 // It's the right template. 5598 StdInitializerList = Template; 5599 } 5600 5601 if (Template != StdInitializerList) 5602 return false; 5603 5604 // This is an instance of std::initializer_list. Find the argument type. 5605 if (Element) 5606 *Element = Arguments[0].getAsType(); 5607 return true; 5608 } 5609 5610 static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5611 NamespaceDecl *Std = S.getStdNamespace(); 5612 if (!Std) { 5613 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5614 return 0; 5615 } 5616 5617 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5618 Loc, Sema::LookupOrdinaryName); 5619 if (!S.LookupQualifiedName(Result, Std)) { 5620 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5621 return 0; 5622 } 5623 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5624 if (!Template) { 5625 Result.suppressDiagnostics(); 5626 // We found something weird. Complain about the first thing we found. 5627 NamedDecl *Found = *Result.begin(); 5628 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5629 return 0; 5630 } 5631 5632 // We found some template called std::initializer_list. Now verify that it's 5633 // correct. 5634 TemplateParameterList *Params = Template->getTemplateParameters(); 5635 if (Params->getMinRequiredArguments() != 1 || 5636 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5637 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5638 return 0; 5639 } 5640 5641 return Template; 5642 } 5643 5644 QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5645 if (!StdInitializerList) { 5646 StdInitializerList = LookupStdInitializerList(*this, Loc); 5647 if (!StdInitializerList) 5648 return QualType(); 5649 } 5650 5651 TemplateArgumentListInfo Args(Loc, Loc); 5652 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5653 Context.getTrivialTypeSourceInfo(Element, 5654 Loc))); 5655 return Context.getCanonicalType( 5656 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5657 } 5658 5659 bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5660 // C++ [dcl.init.list]p2: 5661 // A constructor is an initializer-list constructor if its first parameter 5662 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5663 // std::initializer_list<E> for some type E, and either there are no other 5664 // parameters or else all other parameters have default arguments. 5665 if (Ctor->getNumParams() < 1 || 5666 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5667 return false; 5668 5669 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5670 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5671 ArgType = RT->getPointeeType().getUnqualifiedType(); 5672 5673 return isStdInitializerList(ArgType, 0); 5674 } 5675 5676 /// \brief Determine whether a using statement is in a context where it will be 5677 /// apply in all contexts. 5678 static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5679 switch (CurContext->getDeclKind()) { 5680 case Decl::TranslationUnit: 5681 return true; 5682 case Decl::LinkageSpec: 5683 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5684 default: 5685 return false; 5686 } 5687 } 5688 5689 namespace { 5690 5691 // Callback to only accept typo corrections that are namespaces. 5692 class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5693 public: 5694 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5695 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5696 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5697 } 5698 return false; 5699 } 5700 }; 5701 5702 } 5703 5704 static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5705 CXXScopeSpec &SS, 5706 SourceLocation IdentLoc, 5707 IdentifierInfo *Ident) { 5708 NamespaceValidatorCCC Validator; 5709 R.clear(); 5710 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5711 R.getLookupKind(), Sc, &SS, 5712 Validator)) { 5713 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 5714 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 5715 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5716 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5717 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5718 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5719 else 5720 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5721 << Ident << CorrectedQuotedStr 5722 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5723 5724 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5725 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5726 5727 R.addDecl(Corrected.getCorrectionDecl()); 5728 return true; 5729 } 5730 return false; 5731 } 5732 5733 Decl *Sema::ActOnUsingDirective(Scope *S, 5734 SourceLocation UsingLoc, 5735 SourceLocation NamespcLoc, 5736 CXXScopeSpec &SS, 5737 SourceLocation IdentLoc, 5738 IdentifierInfo *NamespcName, 5739 AttributeList *AttrList) { 5740 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5741 assert(NamespcName && "Invalid NamespcName."); 5742 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5743 5744 // This can only happen along a recovery path. 5745 while (S->getFlags() & Scope::TemplateParamScope) 5746 S = S->getParent(); 5747 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5748 5749 UsingDirectiveDecl *UDir = 0; 5750 NestedNameSpecifier *Qualifier = 0; 5751 if (SS.isSet()) 5752 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5753 5754 // Lookup namespace name. 5755 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5756 LookupParsedName(R, S, &SS); 5757 if (R.isAmbiguous()) 5758 return 0; 5759 5760 if (R.empty()) { 5761 R.clear(); 5762 // Allow "using namespace std;" or "using namespace ::std;" even if 5763 // "std" hasn't been defined yet, for GCC compatibility. 5764 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5765 NamespcName->isStr("std")) { 5766 Diag(IdentLoc, diag::ext_using_undefined_std); 5767 R.addDecl(getOrCreateStdNamespace()); 5768 R.resolveKind(); 5769 } 5770 // Otherwise, attempt typo correction. 5771 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5772 } 5773 5774 if (!R.empty()) { 5775 NamedDecl *Named = R.getFoundDecl(); 5776 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5777 && "expected namespace decl"); 5778 // C++ [namespace.udir]p1: 5779 // A using-directive specifies that the names in the nominated 5780 // namespace can be used in the scope in which the 5781 // using-directive appears after the using-directive. During 5782 // unqualified name lookup (3.4.1), the names appear as if they 5783 // were declared in the nearest enclosing namespace which 5784 // contains both the using-directive and the nominated 5785 // namespace. [Note: in this context, "contains" means "contains 5786 // directly or indirectly". ] 5787 5788 // Find enclosing context containing both using-directive and 5789 // nominated namespace. 5790 NamespaceDecl *NS = getNamespaceDecl(Named); 5791 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5792 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5793 CommonAncestor = CommonAncestor->getParent(); 5794 5795 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5796 SS.getWithLocInContext(Context), 5797 IdentLoc, Named, CommonAncestor); 5798 5799 if (IsUsingDirectiveInToplevelContext(CurContext) && 5800 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5801 Diag(IdentLoc, diag::warn_using_directive_in_header); 5802 } 5803 5804 PushUsingDirective(S, UDir); 5805 } else { 5806 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5807 } 5808 5809 // FIXME: We ignore attributes for now. 5810 return UDir; 5811 } 5812 5813 void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5814 // If the scope has an associated entity and the using directive is at 5815 // namespace or translation unit scope, add the UsingDirectiveDecl into 5816 // its lookup structure so qualified name lookup can find it. 5817 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 5818 if (Ctx && !Ctx->isFunctionOrMethod()) 5819 Ctx->addDecl(UDir); 5820 else 5821 // Otherwise, it is at block sope. The using-directives will affect lookup 5822 // only to the end of the scope. 5823 S->PushUsingDirective(UDir); 5824 } 5825 5826 5827 Decl *Sema::ActOnUsingDeclaration(Scope *S, 5828 AccessSpecifier AS, 5829 bool HasUsingKeyword, 5830 SourceLocation UsingLoc, 5831 CXXScopeSpec &SS, 5832 UnqualifiedId &Name, 5833 AttributeList *AttrList, 5834 bool IsTypeName, 5835 SourceLocation TypenameLoc) { 5836 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5837 5838 switch (Name.getKind()) { 5839 case UnqualifiedId::IK_ImplicitSelfParam: 5840 case UnqualifiedId::IK_Identifier: 5841 case UnqualifiedId::IK_OperatorFunctionId: 5842 case UnqualifiedId::IK_LiteralOperatorId: 5843 case UnqualifiedId::IK_ConversionFunctionId: 5844 break; 5845 5846 case UnqualifiedId::IK_ConstructorName: 5847 case UnqualifiedId::IK_ConstructorTemplateId: 5848 // C++11 inheriting constructors. 5849 Diag(Name.getLocStart(), 5850 getLangOpts().CPlusPlus0x ? 5851 // FIXME: Produce warn_cxx98_compat_using_decl_constructor 5852 // instead once inheriting constructors work. 5853 diag::err_using_decl_constructor_unsupported : 5854 diag::err_using_decl_constructor) 5855 << SS.getRange(); 5856 5857 if (getLangOpts().CPlusPlus0x) break; 5858 5859 return 0; 5860 5861 case UnqualifiedId::IK_DestructorName: 5862 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 5863 << SS.getRange(); 5864 return 0; 5865 5866 case UnqualifiedId::IK_TemplateId: 5867 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 5868 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5869 return 0; 5870 } 5871 5872 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5873 DeclarationName TargetName = TargetNameInfo.getName(); 5874 if (!TargetName) 5875 return 0; 5876 5877 // Warn about using declarations. 5878 // TODO: store that the declaration was written without 'using' and 5879 // talk about access decls instead of using decls in the 5880 // diagnostics. 5881 if (!HasUsingKeyword) { 5882 UsingLoc = Name.getLocStart(); 5883 5884 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5885 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5886 } 5887 5888 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5889 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5890 return 0; 5891 5892 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5893 TargetNameInfo, AttrList, 5894 /* IsInstantiation */ false, 5895 IsTypeName, TypenameLoc); 5896 if (UD) 5897 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5898 5899 return UD; 5900 } 5901 5902 /// \brief Determine whether a using declaration considers the given 5903 /// declarations as "equivalent", e.g., if they are redeclarations of 5904 /// the same entity or are both typedefs of the same type. 5905 static bool 5906 IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5907 bool &SuppressRedeclaration) { 5908 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5909 SuppressRedeclaration = false; 5910 return true; 5911 } 5912 5913 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5914 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5915 SuppressRedeclaration = true; 5916 return Context.hasSameType(TD1->getUnderlyingType(), 5917 TD2->getUnderlyingType()); 5918 } 5919 5920 return false; 5921 } 5922 5923 5924 /// Determines whether to create a using shadow decl for a particular 5925 /// decl, given the set of decls existing prior to this using lookup. 5926 bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5927 const LookupResult &Previous) { 5928 // Diagnose finding a decl which is not from a base class of the 5929 // current class. We do this now because there are cases where this 5930 // function will silently decide not to build a shadow decl, which 5931 // will pre-empt further diagnostics. 5932 // 5933 // We don't need to do this in C++0x because we do the check once on 5934 // the qualifier. 5935 // 5936 // FIXME: diagnose the following if we care enough: 5937 // struct A { int foo; }; 5938 // struct B : A { using A::foo; }; 5939 // template <class T> struct C : A {}; 5940 // template <class T> struct D : C<T> { using B::foo; } // <--- 5941 // This is invalid (during instantiation) in C++03 because B::foo 5942 // resolves to the using decl in B, which is not a base class of D<T>. 5943 // We can't diagnose it immediately because C<T> is an unknown 5944 // specialization. The UsingShadowDecl in D<T> then points directly 5945 // to A::foo, which will look well-formed when we instantiate. 5946 // The right solution is to not collapse the shadow-decl chain. 5947 if (!getLangOpts().CPlusPlus0x && CurContext->isRecord()) { 5948 DeclContext *OrigDC = Orig->getDeclContext(); 5949 5950 // Handle enums and anonymous structs. 5951 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5952 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5953 while (OrigRec->isAnonymousStructOrUnion()) 5954 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5955 5956 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5957 if (OrigDC == CurContext) { 5958 Diag(Using->getLocation(), 5959 diag::err_using_decl_nested_name_specifier_is_current_class) 5960 << Using->getQualifierLoc().getSourceRange(); 5961 Diag(Orig->getLocation(), diag::note_using_decl_target); 5962 return true; 5963 } 5964 5965 Diag(Using->getQualifierLoc().getBeginLoc(), 5966 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5967 << Using->getQualifier() 5968 << cast<CXXRecordDecl>(CurContext) 5969 << Using->getQualifierLoc().getSourceRange(); 5970 Diag(Orig->getLocation(), diag::note_using_decl_target); 5971 return true; 5972 } 5973 } 5974 5975 if (Previous.empty()) return false; 5976 5977 NamedDecl *Target = Orig; 5978 if (isa<UsingShadowDecl>(Target)) 5979 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5980 5981 // If the target happens to be one of the previous declarations, we 5982 // don't have a conflict. 5983 // 5984 // FIXME: but we might be increasing its access, in which case we 5985 // should redeclare it. 5986 NamedDecl *NonTag = 0, *Tag = 0; 5987 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5988 I != E; ++I) { 5989 NamedDecl *D = (*I)->getUnderlyingDecl(); 5990 bool Result; 5991 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5992 return Result; 5993 5994 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5995 } 5996 5997 if (Target->isFunctionOrFunctionTemplate()) { 5998 FunctionDecl *FD; 5999 if (isa<FunctionTemplateDecl>(Target)) 6000 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6001 else 6002 FD = cast<FunctionDecl>(Target); 6003 6004 NamedDecl *OldDecl = 0; 6005 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6006 case Ovl_Overload: 6007 return false; 6008 6009 case Ovl_NonFunction: 6010 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6011 break; 6012 6013 // We found a decl with the exact signature. 6014 case Ovl_Match: 6015 // If we're in a record, we want to hide the target, so we 6016 // return true (without a diagnostic) to tell the caller not to 6017 // build a shadow decl. 6018 if (CurContext->isRecord()) 6019 return true; 6020 6021 // If we're not in a record, this is an error. 6022 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6023 break; 6024 } 6025 6026 Diag(Target->getLocation(), diag::note_using_decl_target); 6027 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6028 return true; 6029 } 6030 6031 // Target is not a function. 6032 6033 if (isa<TagDecl>(Target)) { 6034 // No conflict between a tag and a non-tag. 6035 if (!Tag) return false; 6036 6037 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6038 Diag(Target->getLocation(), diag::note_using_decl_target); 6039 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6040 return true; 6041 } 6042 6043 // No conflict between a tag and a non-tag. 6044 if (!NonTag) return false; 6045 6046 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6047 Diag(Target->getLocation(), diag::note_using_decl_target); 6048 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6049 return true; 6050 } 6051 6052 /// Builds a shadow declaration corresponding to a 'using' declaration. 6053 UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6054 UsingDecl *UD, 6055 NamedDecl *Orig) { 6056 6057 // If we resolved to another shadow declaration, just coalesce them. 6058 NamedDecl *Target = Orig; 6059 if (isa<UsingShadowDecl>(Target)) { 6060 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6061 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6062 } 6063 6064 UsingShadowDecl *Shadow 6065 = UsingShadowDecl::Create(Context, CurContext, 6066 UD->getLocation(), UD, Target); 6067 UD->addShadowDecl(Shadow); 6068 6069 Shadow->setAccess(UD->getAccess()); 6070 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6071 Shadow->setInvalidDecl(); 6072 6073 if (S) 6074 PushOnScopeChains(Shadow, S); 6075 else 6076 CurContext->addDecl(Shadow); 6077 6078 6079 return Shadow; 6080 } 6081 6082 /// Hides a using shadow declaration. This is required by the current 6083 /// using-decl implementation when a resolvable using declaration in a 6084 /// class is followed by a declaration which would hide or override 6085 /// one or more of the using decl's targets; for example: 6086 /// 6087 /// struct Base { void foo(int); }; 6088 /// struct Derived : Base { 6089 /// using Base::foo; 6090 /// void foo(int); 6091 /// }; 6092 /// 6093 /// The governing language is C++03 [namespace.udecl]p12: 6094 /// 6095 /// When a using-declaration brings names from a base class into a 6096 /// derived class scope, member functions in the derived class 6097 /// override and/or hide member functions with the same name and 6098 /// parameter types in a base class (rather than conflicting). 6099 /// 6100 /// There are two ways to implement this: 6101 /// (1) optimistically create shadow decls when they're not hidden 6102 /// by existing declarations, or 6103 /// (2) don't create any shadow decls (or at least don't make them 6104 /// visible) until we've fully parsed/instantiated the class. 6105 /// The problem with (1) is that we might have to retroactively remove 6106 /// a shadow decl, which requires several O(n) operations because the 6107 /// decl structures are (very reasonably) not designed for removal. 6108 /// (2) avoids this but is very fiddly and phase-dependent. 6109 void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6110 if (Shadow->getDeclName().getNameKind() == 6111 DeclarationName::CXXConversionFunctionName) 6112 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6113 6114 // Remove it from the DeclContext... 6115 Shadow->getDeclContext()->removeDecl(Shadow); 6116 6117 // ...and the scope, if applicable... 6118 if (S) { 6119 S->RemoveDecl(Shadow); 6120 IdResolver.RemoveDecl(Shadow); 6121 } 6122 6123 // ...and the using decl. 6124 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6125 6126 // TODO: complain somehow if Shadow was used. It shouldn't 6127 // be possible for this to happen, because...? 6128 } 6129 6130 /// Builds a using declaration. 6131 /// 6132 /// \param IsInstantiation - Whether this call arises from an 6133 /// instantiation of an unresolved using declaration. We treat 6134 /// the lookup differently for these declarations. 6135 NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6136 SourceLocation UsingLoc, 6137 CXXScopeSpec &SS, 6138 const DeclarationNameInfo &NameInfo, 6139 AttributeList *AttrList, 6140 bool IsInstantiation, 6141 bool IsTypeName, 6142 SourceLocation TypenameLoc) { 6143 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6144 SourceLocation IdentLoc = NameInfo.getLoc(); 6145 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6146 6147 // FIXME: We ignore attributes for now. 6148 6149 if (SS.isEmpty()) { 6150 Diag(IdentLoc, diag::err_using_requires_qualname); 6151 return 0; 6152 } 6153 6154 // Do the redeclaration lookup in the current scope. 6155 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6156 ForRedeclaration); 6157 Previous.setHideTags(false); 6158 if (S) { 6159 LookupName(Previous, S); 6160 6161 // It is really dumb that we have to do this. 6162 LookupResult::Filter F = Previous.makeFilter(); 6163 while (F.hasNext()) { 6164 NamedDecl *D = F.next(); 6165 if (!isDeclInScope(D, CurContext, S)) 6166 F.erase(); 6167 } 6168 F.done(); 6169 } else { 6170 assert(IsInstantiation && "no scope in non-instantiation"); 6171 assert(CurContext->isRecord() && "scope not record in instantiation"); 6172 LookupQualifiedName(Previous, CurContext); 6173 } 6174 6175 // Check for invalid redeclarations. 6176 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6177 return 0; 6178 6179 // Check for bad qualifiers. 6180 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6181 return 0; 6182 6183 DeclContext *LookupContext = computeDeclContext(SS); 6184 NamedDecl *D; 6185 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6186 if (!LookupContext) { 6187 if (IsTypeName) { 6188 // FIXME: not all declaration name kinds are legal here 6189 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6190 UsingLoc, TypenameLoc, 6191 QualifierLoc, 6192 IdentLoc, NameInfo.getName()); 6193 } else { 6194 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6195 QualifierLoc, NameInfo); 6196 } 6197 } else { 6198 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6199 NameInfo, IsTypeName); 6200 } 6201 D->setAccess(AS); 6202 CurContext->addDecl(D); 6203 6204 if (!LookupContext) return D; 6205 UsingDecl *UD = cast<UsingDecl>(D); 6206 6207 if (RequireCompleteDeclContext(SS, LookupContext)) { 6208 UD->setInvalidDecl(); 6209 return UD; 6210 } 6211 6212 // The normal rules do not apply to inheriting constructor declarations. 6213 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6214 if (CheckInheritingConstructorUsingDecl(UD)) 6215 UD->setInvalidDecl(); 6216 return UD; 6217 } 6218 6219 // Otherwise, look up the target name. 6220 6221 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6222 6223 // Unlike most lookups, we don't always want to hide tag 6224 // declarations: tag names are visible through the using declaration 6225 // even if hidden by ordinary names, *except* in a dependent context 6226 // where it's important for the sanity of two-phase lookup. 6227 if (!IsInstantiation) 6228 R.setHideTags(false); 6229 6230 // For the purposes of this lookup, we have a base object type 6231 // equal to that of the current context. 6232 if (CurContext->isRecord()) { 6233 R.setBaseObjectType( 6234 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6235 } 6236 6237 LookupQualifiedName(R, LookupContext); 6238 6239 if (R.empty()) { 6240 Diag(IdentLoc, diag::err_no_member) 6241 << NameInfo.getName() << LookupContext << SS.getRange(); 6242 UD->setInvalidDecl(); 6243 return UD; 6244 } 6245 6246 if (R.isAmbiguous()) { 6247 UD->setInvalidDecl(); 6248 return UD; 6249 } 6250 6251 if (IsTypeName) { 6252 // If we asked for a typename and got a non-type decl, error out. 6253 if (!R.getAsSingle<TypeDecl>()) { 6254 Diag(IdentLoc, diag::err_using_typename_non_type); 6255 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6256 Diag((*I)->getUnderlyingDecl()->getLocation(), 6257 diag::note_using_decl_target); 6258 UD->setInvalidDecl(); 6259 return UD; 6260 } 6261 } else { 6262 // If we asked for a non-typename and we got a type, error out, 6263 // but only if this is an instantiation of an unresolved using 6264 // decl. Otherwise just silently find the type name. 6265 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6266 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6267 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6268 UD->setInvalidDecl(); 6269 return UD; 6270 } 6271 } 6272 6273 // C++0x N2914 [namespace.udecl]p6: 6274 // A using-declaration shall not name a namespace. 6275 if (R.getAsSingle<NamespaceDecl>()) { 6276 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6277 << SS.getRange(); 6278 UD->setInvalidDecl(); 6279 return UD; 6280 } 6281 6282 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6283 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6284 BuildUsingShadowDecl(S, UD, *I); 6285 } 6286 6287 return UD; 6288 } 6289 6290 /// Additional checks for a using declaration referring to a constructor name. 6291 bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6292 assert(!UD->isTypeName() && "expecting a constructor name"); 6293 6294 const Type *SourceType = UD->getQualifier()->getAsType(); 6295 assert(SourceType && 6296 "Using decl naming constructor doesn't have type in scope spec."); 6297 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6298 6299 // Check whether the named type is a direct base class. 6300 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6301 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6302 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6303 BaseIt != BaseE; ++BaseIt) { 6304 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6305 if (CanonicalSourceType == BaseType) 6306 break; 6307 if (BaseIt->getType()->isDependentType()) 6308 break; 6309 } 6310 6311 if (BaseIt == BaseE) { 6312 // Did not find SourceType in the bases. 6313 Diag(UD->getUsingLocation(), 6314 diag::err_using_decl_constructor_not_in_direct_base) 6315 << UD->getNameInfo().getSourceRange() 6316 << QualType(SourceType, 0) << TargetClass; 6317 return true; 6318 } 6319 6320 if (!CurContext->isDependentContext()) 6321 BaseIt->setInheritConstructors(); 6322 6323 return false; 6324 } 6325 6326 /// Checks that the given using declaration is not an invalid 6327 /// redeclaration. Note that this is checking only for the using decl 6328 /// itself, not for any ill-formedness among the UsingShadowDecls. 6329 bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6330 bool isTypeName, 6331 const CXXScopeSpec &SS, 6332 SourceLocation NameLoc, 6333 const LookupResult &Prev) { 6334 // C++03 [namespace.udecl]p8: 6335 // C++0x [namespace.udecl]p10: 6336 // A using-declaration is a declaration and can therefore be used 6337 // repeatedly where (and only where) multiple declarations are 6338 // allowed. 6339 // 6340 // That's in non-member contexts. 6341 if (!CurContext->getRedeclContext()->isRecord()) 6342 return false; 6343 6344 NestedNameSpecifier *Qual 6345 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6346 6347 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6348 NamedDecl *D = *I; 6349 6350 bool DTypename; 6351 NestedNameSpecifier *DQual; 6352 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6353 DTypename = UD->isTypeName(); 6354 DQual = UD->getQualifier(); 6355 } else if (UnresolvedUsingValueDecl *UD 6356 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6357 DTypename = false; 6358 DQual = UD->getQualifier(); 6359 } else if (UnresolvedUsingTypenameDecl *UD 6360 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6361 DTypename = true; 6362 DQual = UD->getQualifier(); 6363 } else continue; 6364 6365 // using decls differ if one says 'typename' and the other doesn't. 6366 // FIXME: non-dependent using decls? 6367 if (isTypeName != DTypename) continue; 6368 6369 // using decls differ if they name different scopes (but note that 6370 // template instantiation can cause this check to trigger when it 6371 // didn't before instantiation). 6372 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6373 Context.getCanonicalNestedNameSpecifier(DQual)) 6374 continue; 6375 6376 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6377 Diag(D->getLocation(), diag::note_using_decl) << 1; 6378 return true; 6379 } 6380 6381 return false; 6382 } 6383 6384 6385 /// Checks that the given nested-name qualifier used in a using decl 6386 /// in the current context is appropriately related to the current 6387 /// scope. If an error is found, diagnoses it and returns true. 6388 bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6389 const CXXScopeSpec &SS, 6390 SourceLocation NameLoc) { 6391 DeclContext *NamedContext = computeDeclContext(SS); 6392 6393 if (!CurContext->isRecord()) { 6394 // C++03 [namespace.udecl]p3: 6395 // C++0x [namespace.udecl]p8: 6396 // A using-declaration for a class member shall be a member-declaration. 6397 6398 // If we weren't able to compute a valid scope, it must be a 6399 // dependent class scope. 6400 if (!NamedContext || NamedContext->isRecord()) { 6401 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6402 << SS.getRange(); 6403 return true; 6404 } 6405 6406 // Otherwise, everything is known to be fine. 6407 return false; 6408 } 6409 6410 // The current scope is a record. 6411 6412 // If the named context is dependent, we can't decide much. 6413 if (!NamedContext) { 6414 // FIXME: in C++0x, we can diagnose if we can prove that the 6415 // nested-name-specifier does not refer to a base class, which is 6416 // still possible in some cases. 6417 6418 // Otherwise we have to conservatively report that things might be 6419 // okay. 6420 return false; 6421 } 6422 6423 if (!NamedContext->isRecord()) { 6424 // Ideally this would point at the last name in the specifier, 6425 // but we don't have that level of source info. 6426 Diag(SS.getRange().getBegin(), 6427 diag::err_using_decl_nested_name_specifier_is_not_class) 6428 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6429 return true; 6430 } 6431 6432 if (!NamedContext->isDependentContext() && 6433 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6434 return true; 6435 6436 if (getLangOpts().CPlusPlus0x) { 6437 // C++0x [namespace.udecl]p3: 6438 // In a using-declaration used as a member-declaration, the 6439 // nested-name-specifier shall name a base class of the class 6440 // being defined. 6441 6442 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6443 cast<CXXRecordDecl>(NamedContext))) { 6444 if (CurContext == NamedContext) { 6445 Diag(NameLoc, 6446 diag::err_using_decl_nested_name_specifier_is_current_class) 6447 << SS.getRange(); 6448 return true; 6449 } 6450 6451 Diag(SS.getRange().getBegin(), 6452 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6453 << (NestedNameSpecifier*) SS.getScopeRep() 6454 << cast<CXXRecordDecl>(CurContext) 6455 << SS.getRange(); 6456 return true; 6457 } 6458 6459 return false; 6460 } 6461 6462 // C++03 [namespace.udecl]p4: 6463 // A using-declaration used as a member-declaration shall refer 6464 // to a member of a base class of the class being defined [etc.]. 6465 6466 // Salient point: SS doesn't have to name a base class as long as 6467 // lookup only finds members from base classes. Therefore we can 6468 // diagnose here only if we can prove that that can't happen, 6469 // i.e. if the class hierarchies provably don't intersect. 6470 6471 // TODO: it would be nice if "definitely valid" results were cached 6472 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6473 // need to be repeated. 6474 6475 struct UserData { 6476 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 6477 6478 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6479 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6480 Data->Bases.insert(Base); 6481 return true; 6482 } 6483 6484 bool hasDependentBases(const CXXRecordDecl *Class) { 6485 return !Class->forallBases(collect, this); 6486 } 6487 6488 /// Returns true if the base is dependent or is one of the 6489 /// accumulated base classes. 6490 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6491 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6492 return !Data->Bases.count(Base); 6493 } 6494 6495 bool mightShareBases(const CXXRecordDecl *Class) { 6496 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6497 } 6498 }; 6499 6500 UserData Data; 6501 6502 // Returns false if we find a dependent base. 6503 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6504 return false; 6505 6506 // Returns false if the class has a dependent base or if it or one 6507 // of its bases is present in the base set of the current context. 6508 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6509 return false; 6510 6511 Diag(SS.getRange().getBegin(), 6512 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6513 << (NestedNameSpecifier*) SS.getScopeRep() 6514 << cast<CXXRecordDecl>(CurContext) 6515 << SS.getRange(); 6516 6517 return true; 6518 } 6519 6520 Decl *Sema::ActOnAliasDeclaration(Scope *S, 6521 AccessSpecifier AS, 6522 MultiTemplateParamsArg TemplateParamLists, 6523 SourceLocation UsingLoc, 6524 UnqualifiedId &Name, 6525 TypeResult Type) { 6526 // Skip up to the relevant declaration scope. 6527 while (S->getFlags() & Scope::TemplateParamScope) 6528 S = S->getParent(); 6529 assert((S->getFlags() & Scope::DeclScope) && 6530 "got alias-declaration outside of declaration scope"); 6531 6532 if (Type.isInvalid()) 6533 return 0; 6534 6535 bool Invalid = false; 6536 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6537 TypeSourceInfo *TInfo = 0; 6538 GetTypeFromParser(Type.get(), &TInfo); 6539 6540 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6541 return 0; 6542 6543 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6544 UPPC_DeclarationType)) { 6545 Invalid = true; 6546 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6547 TInfo->getTypeLoc().getBeginLoc()); 6548 } 6549 6550 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6551 LookupName(Previous, S); 6552 6553 // Warn about shadowing the name of a template parameter. 6554 if (Previous.isSingleResult() && 6555 Previous.getFoundDecl()->isTemplateParameter()) { 6556 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6557 Previous.clear(); 6558 } 6559 6560 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6561 "name in alias declaration must be an identifier"); 6562 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6563 Name.StartLocation, 6564 Name.Identifier, TInfo); 6565 6566 NewTD->setAccess(AS); 6567 6568 if (Invalid) 6569 NewTD->setInvalidDecl(); 6570 6571 CheckTypedefForVariablyModifiedType(S, NewTD); 6572 Invalid |= NewTD->isInvalidDecl(); 6573 6574 bool Redeclaration = false; 6575 6576 NamedDecl *NewND; 6577 if (TemplateParamLists.size()) { 6578 TypeAliasTemplateDecl *OldDecl = 0; 6579 TemplateParameterList *OldTemplateParams = 0; 6580 6581 if (TemplateParamLists.size() != 1) { 6582 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6583 << SourceRange(TemplateParamLists[1]->getTemplateLoc(), 6584 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); 6585 } 6586 TemplateParameterList *TemplateParams = TemplateParamLists[0]; 6587 6588 // Only consider previous declarations in the same scope. 6589 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6590 /*ExplicitInstantiationOrSpecialization*/false); 6591 if (!Previous.empty()) { 6592 Redeclaration = true; 6593 6594 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6595 if (!OldDecl && !Invalid) { 6596 Diag(UsingLoc, diag::err_redefinition_different_kind) 6597 << Name.Identifier; 6598 6599 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6600 if (OldD->getLocation().isValid()) 6601 Diag(OldD->getLocation(), diag::note_previous_definition); 6602 6603 Invalid = true; 6604 } 6605 6606 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6607 if (TemplateParameterListsAreEqual(TemplateParams, 6608 OldDecl->getTemplateParameters(), 6609 /*Complain=*/true, 6610 TPL_TemplateMatch)) 6611 OldTemplateParams = OldDecl->getTemplateParameters(); 6612 else 6613 Invalid = true; 6614 6615 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6616 if (!Invalid && 6617 !Context.hasSameType(OldTD->getUnderlyingType(), 6618 NewTD->getUnderlyingType())) { 6619 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6620 // but we can't reasonably accept it. 6621 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6622 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6623 if (OldTD->getLocation().isValid()) 6624 Diag(OldTD->getLocation(), diag::note_previous_definition); 6625 Invalid = true; 6626 } 6627 } 6628 } 6629 6630 // Merge any previous default template arguments into our parameters, 6631 // and check the parameter list. 6632 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6633 TPC_TypeAliasTemplate)) 6634 return 0; 6635 6636 TypeAliasTemplateDecl *NewDecl = 6637 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6638 Name.Identifier, TemplateParams, 6639 NewTD); 6640 6641 NewDecl->setAccess(AS); 6642 6643 if (Invalid) 6644 NewDecl->setInvalidDecl(); 6645 else if (OldDecl) 6646 NewDecl->setPreviousDeclaration(OldDecl); 6647 6648 NewND = NewDecl; 6649 } else { 6650 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6651 NewND = NewTD; 6652 } 6653 6654 if (!Redeclaration) 6655 PushOnScopeChains(NewND, S); 6656 6657 ActOnDocumentableDecl(NewND); 6658 return NewND; 6659 } 6660 6661 Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6662 SourceLocation NamespaceLoc, 6663 SourceLocation AliasLoc, 6664 IdentifierInfo *Alias, 6665 CXXScopeSpec &SS, 6666 SourceLocation IdentLoc, 6667 IdentifierInfo *Ident) { 6668 6669 // Lookup the namespace name. 6670 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6671 LookupParsedName(R, S, &SS); 6672 6673 // Check if we have a previous declaration with the same name. 6674 NamedDecl *PrevDecl 6675 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6676 ForRedeclaration); 6677 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6678 PrevDecl = 0; 6679 6680 if (PrevDecl) { 6681 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6682 // We already have an alias with the same name that points to the same 6683 // namespace, so don't create a new one. 6684 // FIXME: At some point, we'll want to create the (redundant) 6685 // declaration to maintain better source information. 6686 if (!R.isAmbiguous() && !R.empty() && 6687 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6688 return 0; 6689 } 6690 6691 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6692 diag::err_redefinition_different_kind; 6693 Diag(AliasLoc, DiagID) << Alias; 6694 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6695 return 0; 6696 } 6697 6698 if (R.isAmbiguous()) 6699 return 0; 6700 6701 if (R.empty()) { 6702 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6703 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6704 return 0; 6705 } 6706 } 6707 6708 NamespaceAliasDecl *AliasDecl = 6709 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6710 Alias, SS.getWithLocInContext(Context), 6711 IdentLoc, R.getFoundDecl()); 6712 6713 PushOnScopeChains(AliasDecl, S); 6714 return AliasDecl; 6715 } 6716 6717 namespace { 6718 /// \brief Scoped object used to handle the state changes required in Sema 6719 /// to implicitly define the body of a C++ member function; 6720 class ImplicitlyDefinedFunctionScope { 6721 Sema &S; 6722 Sema::ContextRAII SavedContext; 6723 6724 public: 6725 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6726 : S(S), SavedContext(S, Method) 6727 { 6728 S.PushFunctionScope(); 6729 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6730 } 6731 6732 ~ImplicitlyDefinedFunctionScope() { 6733 S.PopExpressionEvaluationContext(); 6734 S.PopFunctionScopeInfo(); 6735 } 6736 }; 6737 } 6738 6739 Sema::ImplicitExceptionSpecification 6740 Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 6741 CXXMethodDecl *MD) { 6742 CXXRecordDecl *ClassDecl = MD->getParent(); 6743 6744 // C++ [except.spec]p14: 6745 // An implicitly declared special member function (Clause 12) shall have an 6746 // exception-specification. [...] 6747 ImplicitExceptionSpecification ExceptSpec(*this); 6748 if (ClassDecl->isInvalidDecl()) 6749 return ExceptSpec; 6750 6751 // Direct base-class constructors. 6752 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6753 BEnd = ClassDecl->bases_end(); 6754 B != BEnd; ++B) { 6755 if (B->isVirtual()) // Handled below. 6756 continue; 6757 6758 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6759 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6760 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6761 // If this is a deleted function, add it anyway. This might be conformant 6762 // with the standard. This might not. I'm not sure. It might not matter. 6763 if (Constructor) 6764 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6765 } 6766 } 6767 6768 // Virtual base-class constructors. 6769 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6770 BEnd = ClassDecl->vbases_end(); 6771 B != BEnd; ++B) { 6772 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6773 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6774 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6775 // If this is a deleted function, add it anyway. This might be conformant 6776 // with the standard. This might not. I'm not sure. It might not matter. 6777 if (Constructor) 6778 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6779 } 6780 } 6781 6782 // Field constructors. 6783 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6784 FEnd = ClassDecl->field_end(); 6785 F != FEnd; ++F) { 6786 if (F->hasInClassInitializer()) { 6787 if (Expr *E = F->getInClassInitializer()) 6788 ExceptSpec.CalledExpr(E); 6789 else if (!F->isInvalidDecl()) 6790 // DR1351: 6791 // If the brace-or-equal-initializer of a non-static data member 6792 // invokes a defaulted default constructor of its class or of an 6793 // enclosing class in a potentially evaluated subexpression, the 6794 // program is ill-formed. 6795 // 6796 // This resolution is unworkable: the exception specification of the 6797 // default constructor can be needed in an unevaluated context, in 6798 // particular, in the operand of a noexcept-expression, and we can be 6799 // unable to compute an exception specification for an enclosed class. 6800 // 6801 // We do not allow an in-class initializer to require the evaluation 6802 // of the exception specification for any in-class initializer whose 6803 // definition is not lexically complete. 6804 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 6805 } else if (const RecordType *RecordTy 6806 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6807 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6808 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6809 // If this is a deleted function, add it anyway. This might be conformant 6810 // with the standard. This might not. I'm not sure. It might not matter. 6811 // In particular, the problem is that this function never gets called. It 6812 // might just be ill-formed because this function attempts to refer to 6813 // a deleted function here. 6814 if (Constructor) 6815 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 6816 } 6817 } 6818 6819 return ExceptSpec; 6820 } 6821 6822 CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6823 CXXRecordDecl *ClassDecl) { 6824 // C++ [class.ctor]p5: 6825 // A default constructor for a class X is a constructor of class X 6826 // that can be called without an argument. If there is no 6827 // user-declared constructor for class X, a default constructor is 6828 // implicitly declared. An implicitly-declared default constructor 6829 // is an inline public member of its class. 6830 assert(!ClassDecl->hasUserDeclaredConstructor() && 6831 "Should not build implicit default constructor!"); 6832 6833 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 6834 CXXDefaultConstructor, 6835 false); 6836 6837 // Create the actual constructor declaration. 6838 CanQualType ClassType 6839 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6840 SourceLocation ClassLoc = ClassDecl->getLocation(); 6841 DeclarationName Name 6842 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6843 DeclarationNameInfo NameInfo(Name, ClassLoc); 6844 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6845 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 6846 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6847 Constexpr); 6848 DefaultCon->setAccess(AS_public); 6849 DefaultCon->setDefaulted(); 6850 DefaultCon->setImplicit(); 6851 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6852 6853 // Build an exception specification pointing back at this constructor. 6854 FunctionProtoType::ExtProtoInfo EPI; 6855 EPI.ExceptionSpecType = EST_Unevaluated; 6856 EPI.ExceptionSpecDecl = DefaultCon; 6857 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6858 6859 // Note that we have declared this constructor. 6860 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6861 6862 if (Scope *S = getScopeForContext(ClassDecl)) 6863 PushOnScopeChains(DefaultCon, S, false); 6864 ClassDecl->addDecl(DefaultCon); 6865 6866 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6867 DefaultCon->setDeletedAsWritten(); 6868 6869 return DefaultCon; 6870 } 6871 6872 void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6873 CXXConstructorDecl *Constructor) { 6874 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6875 !Constructor->doesThisDeclarationHaveABody() && 6876 !Constructor->isDeleted()) && 6877 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6878 6879 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6880 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6881 6882 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6883 DiagnosticErrorTrap Trap(Diags); 6884 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6885 Trap.hasErrorOccurred()) { 6886 Diag(CurrentLocation, diag::note_member_synthesized_at) 6887 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6888 Constructor->setInvalidDecl(); 6889 return; 6890 } 6891 6892 SourceLocation Loc = Constructor->getLocation(); 6893 Constructor->setBody(new (Context) CompoundStmt(Loc)); 6894 6895 Constructor->setUsed(); 6896 MarkVTableUsed(CurrentLocation, ClassDecl); 6897 6898 if (ASTMutationListener *L = getASTMutationListener()) { 6899 L->CompletedImplicitDefinition(Constructor); 6900 } 6901 } 6902 6903 void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6904 if (!D) return; 6905 AdjustDeclIfTemplate(D); 6906 6907 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6908 6909 if (!ClassDecl->isDependentType()) 6910 CheckExplicitlyDefaultedMethods(ClassDecl); 6911 } 6912 6913 void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6914 // We start with an initial pass over the base classes to collect those that 6915 // inherit constructors from. If there are none, we can forgo all further 6916 // processing. 6917 typedef SmallVector<const RecordType *, 4> BasesVector; 6918 BasesVector BasesToInheritFrom; 6919 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6920 BaseE = ClassDecl->bases_end(); 6921 BaseIt != BaseE; ++BaseIt) { 6922 if (BaseIt->getInheritConstructors()) { 6923 QualType Base = BaseIt->getType(); 6924 if (Base->isDependentType()) { 6925 // If we inherit constructors from anything that is dependent, just 6926 // abort processing altogether. We'll get another chance for the 6927 // instantiations. 6928 return; 6929 } 6930 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6931 } 6932 } 6933 if (BasesToInheritFrom.empty()) 6934 return; 6935 6936 // Now collect the constructors that we already have in the current class. 6937 // Those take precedence over inherited constructors. 6938 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6939 // unless there is a user-declared constructor with the same signature in 6940 // the class where the using-declaration appears. 6941 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6942 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6943 CtorE = ClassDecl->ctor_end(); 6944 CtorIt != CtorE; ++CtorIt) { 6945 ExistingConstructors.insert( 6946 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6947 } 6948 6949 DeclarationName CreatedCtorName = 6950 Context.DeclarationNames.getCXXConstructorName( 6951 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6952 6953 // Now comes the true work. 6954 // First, we keep a map from constructor types to the base that introduced 6955 // them. Needed for finding conflicting constructors. We also keep the 6956 // actually inserted declarations in there, for pretty diagnostics. 6957 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6958 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6959 ConstructorToSourceMap InheritedConstructors; 6960 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6961 BaseE = BasesToInheritFrom.end(); 6962 BaseIt != BaseE; ++BaseIt) { 6963 const RecordType *Base = *BaseIt; 6964 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6965 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6966 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6967 CtorE = BaseDecl->ctor_end(); 6968 CtorIt != CtorE; ++CtorIt) { 6969 // Find the using declaration for inheriting this base's constructors. 6970 // FIXME: Don't perform name lookup just to obtain a source location! 6971 DeclarationName Name = 6972 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6973 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 6974 LookupQualifiedName(Result, CurContext); 6975 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 6976 SourceLocation UsingLoc = UD ? UD->getLocation() : 6977 ClassDecl->getLocation(); 6978 6979 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6980 // from the class X named in the using-declaration consists of actual 6981 // constructors and notional constructors that result from the 6982 // transformation of defaulted parameters as follows: 6983 // - all non-template default constructors of X, and 6984 // - for each non-template constructor of X that has at least one 6985 // parameter with a default argument, the set of constructors that 6986 // results from omitting any ellipsis parameter specification and 6987 // successively omitting parameters with a default argument from the 6988 // end of the parameter-type-list. 6989 CXXConstructorDecl *BaseCtor = *CtorIt; 6990 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6991 const FunctionProtoType *BaseCtorType = 6992 BaseCtor->getType()->getAs<FunctionProtoType>(); 6993 6994 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6995 maxParams = BaseCtor->getNumParams(); 6996 params <= maxParams; ++params) { 6997 // Skip default constructors. They're never inherited. 6998 if (params == 0) 6999 continue; 7000 // Skip copy and move constructors for the same reason. 7001 if (CanBeCopyOrMove && params == 1) 7002 continue; 7003 7004 // Build up a function type for this particular constructor. 7005 // FIXME: The working paper does not consider that the exception spec 7006 // for the inheriting constructor might be larger than that of the 7007 // source. This code doesn't yet, either. When it does, this code will 7008 // need to be delayed until after exception specifications and in-class 7009 // member initializers are attached. 7010 const Type *NewCtorType; 7011 if (params == maxParams) 7012 NewCtorType = BaseCtorType; 7013 else { 7014 SmallVector<QualType, 16> Args; 7015 for (unsigned i = 0; i < params; ++i) { 7016 Args.push_back(BaseCtorType->getArgType(i)); 7017 } 7018 FunctionProtoType::ExtProtoInfo ExtInfo = 7019 BaseCtorType->getExtProtoInfo(); 7020 ExtInfo.Variadic = false; 7021 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7022 Args.data(), params, ExtInfo) 7023 .getTypePtr(); 7024 } 7025 const Type *CanonicalNewCtorType = 7026 Context.getCanonicalType(NewCtorType); 7027 7028 // Now that we have the type, first check if the class already has a 7029 // constructor with this signature. 7030 if (ExistingConstructors.count(CanonicalNewCtorType)) 7031 continue; 7032 7033 // Then we check if we have already declared an inherited constructor 7034 // with this signature. 7035 std::pair<ConstructorToSourceMap::iterator, bool> result = 7036 InheritedConstructors.insert(std::make_pair( 7037 CanonicalNewCtorType, 7038 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7039 if (!result.second) { 7040 // Already in the map. If it came from a different class, that's an 7041 // error. Not if it's from the same. 7042 CanQualType PreviousBase = result.first->second.first; 7043 if (CanonicalBase != PreviousBase) { 7044 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7045 const CXXConstructorDecl *PrevBaseCtor = 7046 PrevCtor->getInheritedConstructor(); 7047 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7048 7049 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7050 Diag(BaseCtor->getLocation(), 7051 diag::note_using_decl_constructor_conflict_current_ctor); 7052 Diag(PrevBaseCtor->getLocation(), 7053 diag::note_using_decl_constructor_conflict_previous_ctor); 7054 Diag(PrevCtor->getLocation(), 7055 diag::note_using_decl_constructor_conflict_previous_using); 7056 } 7057 continue; 7058 } 7059 7060 // OK, we're there, now add the constructor. 7061 // C++0x [class.inhctor]p8: [...] that would be performed by a 7062 // user-written inline constructor [...] 7063 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7064 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7065 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7066 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7067 /*ImplicitlyDeclared=*/true, 7068 // FIXME: Due to a defect in the standard, we treat inherited 7069 // constructors as constexpr even if that makes them ill-formed. 7070 /*Constexpr=*/BaseCtor->isConstexpr()); 7071 NewCtor->setAccess(BaseCtor->getAccess()); 7072 7073 // Build up the parameter decls and add them. 7074 SmallVector<ParmVarDecl *, 16> ParamDecls; 7075 for (unsigned i = 0; i < params; ++i) { 7076 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7077 UsingLoc, UsingLoc, 7078 /*IdentifierInfo=*/0, 7079 BaseCtorType->getArgType(i), 7080 /*TInfo=*/0, SC_None, 7081 SC_None, /*DefaultArg=*/0)); 7082 } 7083 NewCtor->setParams(ParamDecls); 7084 NewCtor->setInheritedConstructor(BaseCtor); 7085 7086 ClassDecl->addDecl(NewCtor); 7087 result.first->second.second = NewCtor; 7088 } 7089 } 7090 } 7091 } 7092 7093 Sema::ImplicitExceptionSpecification 7094 Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 7095 CXXRecordDecl *ClassDecl = MD->getParent(); 7096 7097 // C++ [except.spec]p14: 7098 // An implicitly declared special member function (Clause 12) shall have 7099 // an exception-specification. 7100 ImplicitExceptionSpecification ExceptSpec(*this); 7101 if (ClassDecl->isInvalidDecl()) 7102 return ExceptSpec; 7103 7104 // Direct base-class destructors. 7105 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7106 BEnd = ClassDecl->bases_end(); 7107 B != BEnd; ++B) { 7108 if (B->isVirtual()) // Handled below. 7109 continue; 7110 7111 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7112 ExceptSpec.CalledDecl(B->getLocStart(), 7113 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7114 } 7115 7116 // Virtual base-class destructors. 7117 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7118 BEnd = ClassDecl->vbases_end(); 7119 B != BEnd; ++B) { 7120 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7121 ExceptSpec.CalledDecl(B->getLocStart(), 7122 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7123 } 7124 7125 // Field destructors. 7126 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7127 FEnd = ClassDecl->field_end(); 7128 F != FEnd; ++F) { 7129 if (const RecordType *RecordTy 7130 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7131 ExceptSpec.CalledDecl(F->getLocation(), 7132 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7133 } 7134 7135 return ExceptSpec; 7136 } 7137 7138 CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7139 // C++ [class.dtor]p2: 7140 // If a class has no user-declared destructor, a destructor is 7141 // declared implicitly. An implicitly-declared destructor is an 7142 // inline public member of its class. 7143 7144 // Create the actual destructor declaration. 7145 CanQualType ClassType 7146 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7147 SourceLocation ClassLoc = ClassDecl->getLocation(); 7148 DeclarationName Name 7149 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7150 DeclarationNameInfo NameInfo(Name, ClassLoc); 7151 CXXDestructorDecl *Destructor 7152 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7153 QualType(), 0, /*isInline=*/true, 7154 /*isImplicitlyDeclared=*/true); 7155 Destructor->setAccess(AS_public); 7156 Destructor->setDefaulted(); 7157 Destructor->setImplicit(); 7158 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7159 7160 // Build an exception specification pointing back at this destructor. 7161 FunctionProtoType::ExtProtoInfo EPI; 7162 EPI.ExceptionSpecType = EST_Unevaluated; 7163 EPI.ExceptionSpecDecl = Destructor; 7164 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7165 7166 // Note that we have declared this destructor. 7167 ++ASTContext::NumImplicitDestructorsDeclared; 7168 7169 // Introduce this destructor into its scope. 7170 if (Scope *S = getScopeForContext(ClassDecl)) 7171 PushOnScopeChains(Destructor, S, false); 7172 ClassDecl->addDecl(Destructor); 7173 7174 AddOverriddenMethods(ClassDecl, Destructor); 7175 7176 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7177 Destructor->setDeletedAsWritten(); 7178 7179 return Destructor; 7180 } 7181 7182 void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7183 CXXDestructorDecl *Destructor) { 7184 assert((Destructor->isDefaulted() && 7185 !Destructor->doesThisDeclarationHaveABody() && 7186 !Destructor->isDeleted()) && 7187 "DefineImplicitDestructor - call it for implicit default dtor"); 7188 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7189 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7190 7191 if (Destructor->isInvalidDecl()) 7192 return; 7193 7194 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7195 7196 DiagnosticErrorTrap Trap(Diags); 7197 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7198 Destructor->getParent()); 7199 7200 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7201 Diag(CurrentLocation, diag::note_member_synthesized_at) 7202 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7203 7204 Destructor->setInvalidDecl(); 7205 return; 7206 } 7207 7208 SourceLocation Loc = Destructor->getLocation(); 7209 Destructor->setBody(new (Context) CompoundStmt(Loc)); 7210 Destructor->setImplicitlyDefined(true); 7211 Destructor->setUsed(); 7212 MarkVTableUsed(CurrentLocation, ClassDecl); 7213 7214 if (ASTMutationListener *L = getASTMutationListener()) { 7215 L->CompletedImplicitDefinition(Destructor); 7216 } 7217 } 7218 7219 /// \brief Perform any semantic analysis which needs to be delayed until all 7220 /// pending class member declarations have been parsed. 7221 void Sema::ActOnFinishCXXMemberDecls() { 7222 // Perform any deferred checking of exception specifications for virtual 7223 // destructors. 7224 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 7225 i != e; ++i) { 7226 const CXXDestructorDecl *Dtor = 7227 DelayedDestructorExceptionSpecChecks[i].first; 7228 assert(!Dtor->getParent()->isDependentType() && 7229 "Should not ever add destructors of templates into the list."); 7230 CheckOverridingFunctionExceptionSpec(Dtor, 7231 DelayedDestructorExceptionSpecChecks[i].second); 7232 } 7233 DelayedDestructorExceptionSpecChecks.clear(); 7234 } 7235 7236 void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 7237 CXXDestructorDecl *Destructor) { 7238 assert(getLangOpts().CPlusPlus0x && 7239 "adjusting dtor exception specs was introduced in c++11"); 7240 7241 // C++11 [class.dtor]p3: 7242 // A declaration of a destructor that does not have an exception- 7243 // specification is implicitly considered to have the same exception- 7244 // specification as an implicit declaration. 7245 const FunctionProtoType *DtorType = Destructor->getType()-> 7246 getAs<FunctionProtoType>(); 7247 if (DtorType->hasExceptionSpec()) 7248 return; 7249 7250 // Replace the destructor's type, building off the existing one. Fortunately, 7251 // the only thing of interest in the destructor type is its extended info. 7252 // The return and arguments are fixed. 7253 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 7254 EPI.ExceptionSpecType = EST_Unevaluated; 7255 EPI.ExceptionSpecDecl = Destructor; 7256 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7257 7258 // FIXME: If the destructor has a body that could throw, and the newly created 7259 // spec doesn't allow exceptions, we should emit a warning, because this 7260 // change in behavior can break conforming C++03 programs at runtime. 7261 // However, we don't have a body or an exception specification yet, so it 7262 // needs to be done somewhere else. 7263 } 7264 7265 /// \brief Builds a statement that copies/moves the given entity from \p From to 7266 /// \c To. 7267 /// 7268 /// This routine is used to copy/move the members of a class with an 7269 /// implicitly-declared copy/move assignment operator. When the entities being 7270 /// copied are arrays, this routine builds for loops to copy them. 7271 /// 7272 /// \param S The Sema object used for type-checking. 7273 /// 7274 /// \param Loc The location where the implicit copy/move is being generated. 7275 /// 7276 /// \param T The type of the expressions being copied/moved. Both expressions 7277 /// must have this type. 7278 /// 7279 /// \param To The expression we are copying/moving to. 7280 /// 7281 /// \param From The expression we are copying/moving from. 7282 /// 7283 /// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7284 /// Otherwise, it's a non-static member subobject. 7285 /// 7286 /// \param Copying Whether we're copying or moving. 7287 /// 7288 /// \param Depth Internal parameter recording the depth of the recursion. 7289 /// 7290 /// \returns A statement or a loop that copies the expressions. 7291 static StmtResult 7292 BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7293 Expr *To, Expr *From, 7294 bool CopyingBaseSubobject, bool Copying, 7295 unsigned Depth = 0) { 7296 // C++0x [class.copy]p28: 7297 // Each subobject is assigned in the manner appropriate to its type: 7298 // 7299 // - if the subobject is of class type, as if by a call to operator= with 7300 // the subobject as the object expression and the corresponding 7301 // subobject of x as a single function argument (as if by explicit 7302 // qualification; that is, ignoring any possible virtual overriding 7303 // functions in more derived classes); 7304 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7305 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7306 7307 // Look for operator=. 7308 DeclarationName Name 7309 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7310 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7311 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7312 7313 // Filter out any result that isn't a copy/move-assignment operator. 7314 LookupResult::Filter F = OpLookup.makeFilter(); 7315 while (F.hasNext()) { 7316 NamedDecl *D = F.next(); 7317 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7318 if (Method->isCopyAssignmentOperator() || 7319 (!Copying && Method->isMoveAssignmentOperator())) 7320 continue; 7321 7322 F.erase(); 7323 } 7324 F.done(); 7325 7326 // Suppress the protected check (C++ [class.protected]) for each of the 7327 // assignment operators we found. This strange dance is required when 7328 // we're assigning via a base classes's copy-assignment operator. To 7329 // ensure that we're getting the right base class subobject (without 7330 // ambiguities), we need to cast "this" to that subobject type; to 7331 // ensure that we don't go through the virtual call mechanism, we need 7332 // to qualify the operator= name with the base class (see below). However, 7333 // this means that if the base class has a protected copy assignment 7334 // operator, the protected member access check will fail. So, we 7335 // rewrite "protected" access to "public" access in this case, since we 7336 // know by construction that we're calling from a derived class. 7337 if (CopyingBaseSubobject) { 7338 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7339 L != LEnd; ++L) { 7340 if (L.getAccess() == AS_protected) 7341 L.setAccess(AS_public); 7342 } 7343 } 7344 7345 // Create the nested-name-specifier that will be used to qualify the 7346 // reference to operator=; this is required to suppress the virtual 7347 // call mechanism. 7348 CXXScopeSpec SS; 7349 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7350 SS.MakeTrivial(S.Context, 7351 NestedNameSpecifier::Create(S.Context, 0, false, 7352 CanonicalT), 7353 Loc); 7354 7355 // Create the reference to operator=. 7356 ExprResult OpEqualRef 7357 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7358 /*TemplateKWLoc=*/SourceLocation(), 7359 /*FirstQualifierInScope=*/0, 7360 OpLookup, 7361 /*TemplateArgs=*/0, 7362 /*SuppressQualifierCheck=*/true); 7363 if (OpEqualRef.isInvalid()) 7364 return StmtError(); 7365 7366 // Build the call to the assignment operator. 7367 7368 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7369 OpEqualRef.takeAs<Expr>(), 7370 Loc, &From, 1, Loc); 7371 if (Call.isInvalid()) 7372 return StmtError(); 7373 7374 return S.Owned(Call.takeAs<Stmt>()); 7375 } 7376 7377 // - if the subobject is of scalar type, the built-in assignment 7378 // operator is used. 7379 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7380 if (!ArrayTy) { 7381 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7382 if (Assignment.isInvalid()) 7383 return StmtError(); 7384 7385 return S.Owned(Assignment.takeAs<Stmt>()); 7386 } 7387 7388 // - if the subobject is an array, each element is assigned, in the 7389 // manner appropriate to the element type; 7390 7391 // Construct a loop over the array bounds, e.g., 7392 // 7393 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7394 // 7395 // that will copy each of the array elements. 7396 QualType SizeType = S.Context.getSizeType(); 7397 7398 // Create the iteration variable. 7399 IdentifierInfo *IterationVarName = 0; 7400 { 7401 SmallString<8> Str; 7402 llvm::raw_svector_ostream OS(Str); 7403 OS << "__i" << Depth; 7404 IterationVarName = &S.Context.Idents.get(OS.str()); 7405 } 7406 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7407 IterationVarName, SizeType, 7408 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7409 SC_None, SC_None); 7410 7411 // Initialize the iteration variable to zero. 7412 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7413 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7414 7415 // Create a reference to the iteration variable; we'll use this several 7416 // times throughout. 7417 Expr *IterationVarRef 7418 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7419 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7420 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7421 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7422 7423 // Create the DeclStmt that holds the iteration variable. 7424 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7425 7426 // Create the comparison against the array bound. 7427 llvm::APInt Upper 7428 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7429 Expr *Comparison 7430 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7431 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7432 BO_NE, S.Context.BoolTy, 7433 VK_RValue, OK_Ordinary, Loc); 7434 7435 // Create the pre-increment of the iteration variable. 7436 Expr *Increment 7437 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7438 VK_LValue, OK_Ordinary, Loc); 7439 7440 // Subscript the "from" and "to" expressions with the iteration variable. 7441 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7442 IterationVarRefRVal, 7443 Loc)); 7444 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7445 IterationVarRefRVal, 7446 Loc)); 7447 if (!Copying) // Cast to rvalue 7448 From = CastForMoving(S, From); 7449 7450 // Build the copy/move for an individual element of the array. 7451 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7452 To, From, CopyingBaseSubobject, 7453 Copying, Depth + 1); 7454 if (Copy.isInvalid()) 7455 return StmtError(); 7456 7457 // Construct the loop that copies all elements of this array. 7458 return S.ActOnForStmt(Loc, Loc, InitStmt, 7459 S.MakeFullExpr(Comparison), 7460 0, S.MakeFullExpr(Increment), 7461 Loc, Copy.take()); 7462 } 7463 7464 /// Determine whether an implicit copy assignment operator for ClassDecl has a 7465 /// const argument. 7466 /// FIXME: It ought to be possible to store this on the record. 7467 static bool isImplicitCopyAssignmentArgConst(Sema &S, 7468 CXXRecordDecl *ClassDecl) { 7469 if (ClassDecl->isInvalidDecl()) 7470 return true; 7471 7472 // C++ [class.copy]p10: 7473 // If the class definition does not explicitly declare a copy 7474 // assignment operator, one is declared implicitly. 7475 // The implicitly-defined copy assignment operator for a class X 7476 // will have the form 7477 // 7478 // X& X::operator=(const X&) 7479 // 7480 // if 7481 // -- each direct base class B of X has a copy assignment operator 7482 // whose parameter is of type const B&, const volatile B& or B, 7483 // and 7484 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7485 BaseEnd = ClassDecl->bases_end(); 7486 Base != BaseEnd; ++Base) { 7487 // We'll handle this below 7488 if (S.getLangOpts().CPlusPlus0x && Base->isVirtual()) 7489 continue; 7490 7491 assert(!Base->getType()->isDependentType() && 7492 "Cannot generate implicit members for class with dependent bases."); 7493 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7494 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0)) 7495 return false; 7496 } 7497 7498 // In C++11, the above citation has "or virtual" added 7499 if (S.getLangOpts().CPlusPlus0x) { 7500 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7501 BaseEnd = ClassDecl->vbases_end(); 7502 Base != BaseEnd; ++Base) { 7503 assert(!Base->getType()->isDependentType() && 7504 "Cannot generate implicit members for class with dependent bases."); 7505 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7506 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7507 false, 0)) 7508 return false; 7509 } 7510 } 7511 7512 // -- for all the nonstatic data members of X that are of a class 7513 // type M (or array thereof), each such class type has a copy 7514 // assignment operator whose parameter is of type const M&, 7515 // const volatile M& or M. 7516 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7517 FieldEnd = ClassDecl->field_end(); 7518 Field != FieldEnd; ++Field) { 7519 QualType FieldType = S.Context.getBaseElementType(Field->getType()); 7520 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) 7521 if (!S.LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, 7522 false, 0)) 7523 return false; 7524 } 7525 7526 // Otherwise, the implicitly declared copy assignment operator will 7527 // have the form 7528 // 7529 // X& X::operator=(X&) 7530 7531 return true; 7532 } 7533 7534 Sema::ImplicitExceptionSpecification 7535 Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 7536 CXXRecordDecl *ClassDecl = MD->getParent(); 7537 7538 ImplicitExceptionSpecification ExceptSpec(*this); 7539 if (ClassDecl->isInvalidDecl()) 7540 return ExceptSpec; 7541 7542 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 7543 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 7544 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 7545 7546 // C++ [except.spec]p14: 7547 // An implicitly declared special member function (Clause 12) shall have an 7548 // exception-specification. [...] 7549 7550 // It is unspecified whether or not an implicit copy assignment operator 7551 // attempts to deduplicate calls to assignment operators of virtual bases are 7552 // made. As such, this exception specification is effectively unspecified. 7553 // Based on a similar decision made for constness in C++0x, we're erring on 7554 // the side of assuming such calls to be made regardless of whether they 7555 // actually happen. 7556 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7557 BaseEnd = ClassDecl->bases_end(); 7558 Base != BaseEnd; ++Base) { 7559 if (Base->isVirtual()) 7560 continue; 7561 7562 CXXRecordDecl *BaseClassDecl 7563 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7564 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7565 ArgQuals, false, 0)) 7566 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7567 } 7568 7569 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7570 BaseEnd = ClassDecl->vbases_end(); 7571 Base != BaseEnd; ++Base) { 7572 CXXRecordDecl *BaseClassDecl 7573 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7574 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7575 ArgQuals, false, 0)) 7576 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7577 } 7578 7579 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7580 FieldEnd = ClassDecl->field_end(); 7581 Field != FieldEnd; 7582 ++Field) { 7583 QualType FieldType = Context.getBaseElementType(Field->getType()); 7584 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7585 if (CXXMethodDecl *CopyAssign = 7586 LookupCopyingAssignment(FieldClassDecl, 7587 ArgQuals | FieldType.getCVRQualifiers(), 7588 false, 0)) 7589 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 7590 } 7591 } 7592 7593 return ExceptSpec; 7594 } 7595 7596 CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7597 // Note: The following rules are largely analoguous to the copy 7598 // constructor rules. Note that virtual bases are not taken into account 7599 // for determining the argument type of the operator. Note also that 7600 // operators taking an object instead of a reference are allowed. 7601 7602 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7603 QualType RetType = Context.getLValueReferenceType(ArgType); 7604 if (isImplicitCopyAssignmentArgConst(*this, ClassDecl)) 7605 ArgType = ArgType.withConst(); 7606 ArgType = Context.getLValueReferenceType(ArgType); 7607 7608 // An implicitly-declared copy assignment operator is an inline public 7609 // member of its class. 7610 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7611 SourceLocation ClassLoc = ClassDecl->getLocation(); 7612 DeclarationNameInfo NameInfo(Name, ClassLoc); 7613 CXXMethodDecl *CopyAssignment 7614 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 7615 /*TInfo=*/0, /*isStatic=*/false, 7616 /*StorageClassAsWritten=*/SC_None, 7617 /*isInline=*/true, /*isConstexpr=*/false, 7618 SourceLocation()); 7619 CopyAssignment->setAccess(AS_public); 7620 CopyAssignment->setDefaulted(); 7621 CopyAssignment->setImplicit(); 7622 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7623 7624 // Build an exception specification pointing back at this member. 7625 FunctionProtoType::ExtProtoInfo EPI; 7626 EPI.ExceptionSpecType = EST_Unevaluated; 7627 EPI.ExceptionSpecDecl = CopyAssignment; 7628 CopyAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 7629 7630 // Add the parameter to the operator. 7631 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7632 ClassLoc, ClassLoc, /*Id=*/0, 7633 ArgType, /*TInfo=*/0, 7634 SC_None, 7635 SC_None, 0); 7636 CopyAssignment->setParams(FromParam); 7637 7638 // Note that we have added this copy-assignment operator. 7639 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7640 7641 if (Scope *S = getScopeForContext(ClassDecl)) 7642 PushOnScopeChains(CopyAssignment, S, false); 7643 ClassDecl->addDecl(CopyAssignment); 7644 7645 // C++0x [class.copy]p19: 7646 // .... If the class definition does not explicitly declare a copy 7647 // assignment operator, there is no user-declared move constructor, and 7648 // there is no user-declared move assignment operator, a copy assignment 7649 // operator is implicitly declared as defaulted. 7650 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7651 CopyAssignment->setDeletedAsWritten(); 7652 7653 AddOverriddenMethods(ClassDecl, CopyAssignment); 7654 return CopyAssignment; 7655 } 7656 7657 void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7658 CXXMethodDecl *CopyAssignOperator) { 7659 assert((CopyAssignOperator->isDefaulted() && 7660 CopyAssignOperator->isOverloadedOperator() && 7661 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7662 !CopyAssignOperator->doesThisDeclarationHaveABody() && 7663 !CopyAssignOperator->isDeleted()) && 7664 "DefineImplicitCopyAssignment called for wrong function"); 7665 7666 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7667 7668 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7669 CopyAssignOperator->setInvalidDecl(); 7670 return; 7671 } 7672 7673 CopyAssignOperator->setUsed(); 7674 7675 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7676 DiagnosticErrorTrap Trap(Diags); 7677 7678 // C++0x [class.copy]p30: 7679 // The implicitly-defined or explicitly-defaulted copy assignment operator 7680 // for a non-union class X performs memberwise copy assignment of its 7681 // subobjects. The direct base classes of X are assigned first, in the 7682 // order of their declaration in the base-specifier-list, and then the 7683 // immediate non-static data members of X are assigned, in the order in 7684 // which they were declared in the class definition. 7685 7686 // The statements that form the synthesized function body. 7687 SmallVector<Stmt*, 8> Statements; 7688 7689 // The parameter for the "other" object, which we are copying from. 7690 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7691 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7692 QualType OtherRefType = Other->getType(); 7693 if (const LValueReferenceType *OtherRef 7694 = OtherRefType->getAs<LValueReferenceType>()) { 7695 OtherRefType = OtherRef->getPointeeType(); 7696 OtherQuals = OtherRefType.getQualifiers(); 7697 } 7698 7699 // Our location for everything implicitly-generated. 7700 SourceLocation Loc = CopyAssignOperator->getLocation(); 7701 7702 // Construct a reference to the "other" object. We'll be using this 7703 // throughout the generated ASTs. 7704 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7705 assert(OtherRef && "Reference to parameter cannot fail!"); 7706 7707 // Construct the "this" pointer. We'll be using this throughout the generated 7708 // ASTs. 7709 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7710 assert(This && "Reference to this cannot fail!"); 7711 7712 // Assign base classes. 7713 bool Invalid = false; 7714 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7715 E = ClassDecl->bases_end(); Base != E; ++Base) { 7716 // Form the assignment: 7717 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7718 QualType BaseType = Base->getType().getUnqualifiedType(); 7719 if (!BaseType->isRecordType()) { 7720 Invalid = true; 7721 continue; 7722 } 7723 7724 CXXCastPath BasePath; 7725 BasePath.push_back(Base); 7726 7727 // Construct the "from" expression, which is an implicit cast to the 7728 // appropriately-qualified base type. 7729 Expr *From = OtherRef; 7730 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7731 CK_UncheckedDerivedToBase, 7732 VK_LValue, &BasePath).take(); 7733 7734 // Dereference "this". 7735 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7736 7737 // Implicitly cast "this" to the appropriately-qualified base type. 7738 To = ImpCastExprToType(To.take(), 7739 Context.getCVRQualifiedType(BaseType, 7740 CopyAssignOperator->getTypeQualifiers()), 7741 CK_UncheckedDerivedToBase, 7742 VK_LValue, &BasePath); 7743 7744 // Build the copy. 7745 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7746 To.get(), From, 7747 /*CopyingBaseSubobject=*/true, 7748 /*Copying=*/true); 7749 if (Copy.isInvalid()) { 7750 Diag(CurrentLocation, diag::note_member_synthesized_at) 7751 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7752 CopyAssignOperator->setInvalidDecl(); 7753 return; 7754 } 7755 7756 // Success! Record the copy. 7757 Statements.push_back(Copy.takeAs<Expr>()); 7758 } 7759 7760 // \brief Reference to the __builtin_memcpy function. 7761 Expr *BuiltinMemCpyRef = 0; 7762 // \brief Reference to the __builtin_objc_memmove_collectable function. 7763 Expr *CollectableMemCpyRef = 0; 7764 7765 // Assign non-static members. 7766 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7767 FieldEnd = ClassDecl->field_end(); 7768 Field != FieldEnd; ++Field) { 7769 if (Field->isUnnamedBitfield()) 7770 continue; 7771 7772 // Check for members of reference type; we can't copy those. 7773 if (Field->getType()->isReferenceType()) { 7774 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7775 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7776 Diag(Field->getLocation(), diag::note_declared_at); 7777 Diag(CurrentLocation, diag::note_member_synthesized_at) 7778 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7779 Invalid = true; 7780 continue; 7781 } 7782 7783 // Check for members of const-qualified, non-class type. 7784 QualType BaseType = Context.getBaseElementType(Field->getType()); 7785 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7786 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7787 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7788 Diag(Field->getLocation(), diag::note_declared_at); 7789 Diag(CurrentLocation, diag::note_member_synthesized_at) 7790 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7791 Invalid = true; 7792 continue; 7793 } 7794 7795 // Suppress assigning zero-width bitfields. 7796 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7797 continue; 7798 7799 QualType FieldType = Field->getType().getNonReferenceType(); 7800 if (FieldType->isIncompleteArrayType()) { 7801 assert(ClassDecl->hasFlexibleArrayMember() && 7802 "Incomplete array type is not valid"); 7803 continue; 7804 } 7805 7806 // Build references to the field in the object we're copying from and to. 7807 CXXScopeSpec SS; // Intentionally empty 7808 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7809 LookupMemberName); 7810 MemberLookup.addDecl(*Field); 7811 MemberLookup.resolveKind(); 7812 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7813 Loc, /*IsArrow=*/false, 7814 SS, SourceLocation(), 0, 7815 MemberLookup, 0); 7816 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7817 Loc, /*IsArrow=*/true, 7818 SS, SourceLocation(), 0, 7819 MemberLookup, 0); 7820 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7821 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7822 7823 // If the field should be copied with __builtin_memcpy rather than via 7824 // explicit assignments, do so. This optimization only applies for arrays 7825 // of scalars and arrays of class type with trivial copy-assignment 7826 // operators. 7827 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7828 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7829 // Compute the size of the memory buffer to be copied. 7830 QualType SizeType = Context.getSizeType(); 7831 llvm::APInt Size(Context.getTypeSize(SizeType), 7832 Context.getTypeSizeInChars(BaseType).getQuantity()); 7833 for (const ConstantArrayType *Array 7834 = Context.getAsConstantArrayType(FieldType); 7835 Array; 7836 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7837 llvm::APInt ArraySize 7838 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7839 Size *= ArraySize; 7840 } 7841 7842 // Take the address of the field references for "from" and "to". 7843 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7844 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7845 7846 bool NeedsCollectableMemCpy = 7847 (BaseType->isRecordType() && 7848 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7849 7850 if (NeedsCollectableMemCpy) { 7851 if (!CollectableMemCpyRef) { 7852 // Create a reference to the __builtin_objc_memmove_collectable function. 7853 LookupResult R(*this, 7854 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7855 Loc, LookupOrdinaryName); 7856 LookupName(R, TUScope, true); 7857 7858 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7859 if (!CollectableMemCpy) { 7860 // Something went horribly wrong earlier, and we will have 7861 // complained about it. 7862 Invalid = true; 7863 continue; 7864 } 7865 7866 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7867 Context.BuiltinFnTy, 7868 VK_RValue, Loc, 0).take(); 7869 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7870 } 7871 } 7872 // Create a reference to the __builtin_memcpy builtin function. 7873 else if (!BuiltinMemCpyRef) { 7874 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7875 LookupOrdinaryName); 7876 LookupName(R, TUScope, true); 7877 7878 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7879 if (!BuiltinMemCpy) { 7880 // Something went horribly wrong earlier, and we will have complained 7881 // about it. 7882 Invalid = true; 7883 continue; 7884 } 7885 7886 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7887 Context.BuiltinFnTy, 7888 VK_RValue, Loc, 0).take(); 7889 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7890 } 7891 7892 SmallVector<Expr*, 8> CallArgs; 7893 CallArgs.push_back(To.takeAs<Expr>()); 7894 CallArgs.push_back(From.takeAs<Expr>()); 7895 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7896 ExprResult Call = ExprError(); 7897 if (NeedsCollectableMemCpy) 7898 Call = ActOnCallExpr(/*Scope=*/0, 7899 CollectableMemCpyRef, 7900 Loc, CallArgs, 7901 Loc); 7902 else 7903 Call = ActOnCallExpr(/*Scope=*/0, 7904 BuiltinMemCpyRef, 7905 Loc, CallArgs, 7906 Loc); 7907 7908 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7909 Statements.push_back(Call.takeAs<Expr>()); 7910 continue; 7911 } 7912 7913 // Build the copy of this field. 7914 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7915 To.get(), From.get(), 7916 /*CopyingBaseSubobject=*/false, 7917 /*Copying=*/true); 7918 if (Copy.isInvalid()) { 7919 Diag(CurrentLocation, diag::note_member_synthesized_at) 7920 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7921 CopyAssignOperator->setInvalidDecl(); 7922 return; 7923 } 7924 7925 // Success! Record the copy. 7926 Statements.push_back(Copy.takeAs<Stmt>()); 7927 } 7928 7929 if (!Invalid) { 7930 // Add a "return *this;" 7931 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7932 7933 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7934 if (Return.isInvalid()) 7935 Invalid = true; 7936 else { 7937 Statements.push_back(Return.takeAs<Stmt>()); 7938 7939 if (Trap.hasErrorOccurred()) { 7940 Diag(CurrentLocation, diag::note_member_synthesized_at) 7941 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7942 Invalid = true; 7943 } 7944 } 7945 } 7946 7947 if (Invalid) { 7948 CopyAssignOperator->setInvalidDecl(); 7949 return; 7950 } 7951 7952 StmtResult Body; 7953 { 7954 CompoundScopeRAII CompoundScope(*this); 7955 Body = ActOnCompoundStmt(Loc, Loc, Statements, 7956 /*isStmtExpr=*/false); 7957 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7958 } 7959 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7960 7961 if (ASTMutationListener *L = getASTMutationListener()) { 7962 L->CompletedImplicitDefinition(CopyAssignOperator); 7963 } 7964 } 7965 7966 Sema::ImplicitExceptionSpecification 7967 Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 7968 CXXRecordDecl *ClassDecl = MD->getParent(); 7969 7970 ImplicitExceptionSpecification ExceptSpec(*this); 7971 if (ClassDecl->isInvalidDecl()) 7972 return ExceptSpec; 7973 7974 // C++0x [except.spec]p14: 7975 // An implicitly declared special member function (Clause 12) shall have an 7976 // exception-specification. [...] 7977 7978 // It is unspecified whether or not an implicit move assignment operator 7979 // attempts to deduplicate calls to assignment operators of virtual bases are 7980 // made. As such, this exception specification is effectively unspecified. 7981 // Based on a similar decision made for constness in C++0x, we're erring on 7982 // the side of assuming such calls to be made regardless of whether they 7983 // actually happen. 7984 // Note that a move constructor is not implicitly declared when there are 7985 // virtual bases, but it can still be user-declared and explicitly defaulted. 7986 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7987 BaseEnd = ClassDecl->bases_end(); 7988 Base != BaseEnd; ++Base) { 7989 if (Base->isVirtual()) 7990 continue; 7991 7992 CXXRecordDecl *BaseClassDecl 7993 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7994 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7995 0, false, 0)) 7996 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 7997 } 7998 7999 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8000 BaseEnd = ClassDecl->vbases_end(); 8001 Base != BaseEnd; ++Base) { 8002 CXXRecordDecl *BaseClassDecl 8003 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8004 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8005 0, false, 0)) 8006 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8007 } 8008 8009 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8010 FieldEnd = ClassDecl->field_end(); 8011 Field != FieldEnd; 8012 ++Field) { 8013 QualType FieldType = Context.getBaseElementType(Field->getType()); 8014 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8015 if (CXXMethodDecl *MoveAssign = 8016 LookupMovingAssignment(FieldClassDecl, 8017 FieldType.getCVRQualifiers(), 8018 false, 0)) 8019 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 8020 } 8021 } 8022 8023 return ExceptSpec; 8024 } 8025 8026 /// Determine whether the class type has any direct or indirect virtual base 8027 /// classes which have a non-trivial move assignment operator. 8028 static bool 8029 hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 8030 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8031 BaseEnd = ClassDecl->vbases_end(); 8032 Base != BaseEnd; ++Base) { 8033 CXXRecordDecl *BaseClass = 8034 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8035 8036 // Try to declare the move assignment. If it would be deleted, then the 8037 // class does not have a non-trivial move assignment. 8038 if (BaseClass->needsImplicitMoveAssignment()) 8039 S.DeclareImplicitMoveAssignment(BaseClass); 8040 8041 // If the class has both a trivial move assignment and a non-trivial move 8042 // assignment, hasTrivialMoveAssignment() is false. 8043 if (BaseClass->hasDeclaredMoveAssignment() && 8044 !BaseClass->hasTrivialMoveAssignment()) 8045 return true; 8046 } 8047 8048 return false; 8049 } 8050 8051 /// Determine whether the given type either has a move constructor or is 8052 /// trivially copyable. 8053 static bool 8054 hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8055 Type = S.Context.getBaseElementType(Type); 8056 8057 // FIXME: Technically, non-trivially-copyable non-class types, such as 8058 // reference types, are supposed to return false here, but that appears 8059 // to be a standard defect. 8060 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8061 if (!ClassDecl || !ClassDecl->getDefinition()) 8062 return true; 8063 8064 if (Type.isTriviallyCopyableType(S.Context)) 8065 return true; 8066 8067 if (IsConstructor) { 8068 if (ClassDecl->needsImplicitMoveConstructor()) 8069 S.DeclareImplicitMoveConstructor(ClassDecl); 8070 return ClassDecl->hasDeclaredMoveConstructor(); 8071 } 8072 8073 if (ClassDecl->needsImplicitMoveAssignment()) 8074 S.DeclareImplicitMoveAssignment(ClassDecl); 8075 return ClassDecl->hasDeclaredMoveAssignment(); 8076 } 8077 8078 /// Determine whether all non-static data members and direct or virtual bases 8079 /// of class \p ClassDecl have either a move operation, or are trivially 8080 /// copyable. 8081 static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8082 bool IsConstructor) { 8083 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8084 BaseEnd = ClassDecl->bases_end(); 8085 Base != BaseEnd; ++Base) { 8086 if (Base->isVirtual()) 8087 continue; 8088 8089 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8090 return false; 8091 } 8092 8093 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8094 BaseEnd = ClassDecl->vbases_end(); 8095 Base != BaseEnd; ++Base) { 8096 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8097 return false; 8098 } 8099 8100 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8101 FieldEnd = ClassDecl->field_end(); 8102 Field != FieldEnd; ++Field) { 8103 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 8104 return false; 8105 } 8106 8107 return true; 8108 } 8109 8110 CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8111 // C++11 [class.copy]p20: 8112 // If the definition of a class X does not explicitly declare a move 8113 // assignment operator, one will be implicitly declared as defaulted 8114 // if and only if: 8115 // 8116 // - [first 4 bullets] 8117 assert(ClassDecl->needsImplicitMoveAssignment()); 8118 8119 // [Checked after we build the declaration] 8120 // - the move assignment operator would not be implicitly defined as 8121 // deleted, 8122 8123 // [DR1402]: 8124 // - X has no direct or indirect virtual base class with a non-trivial 8125 // move assignment operator, and 8126 // - each of X's non-static data members and direct or virtual base classes 8127 // has a type that either has a move assignment operator or is trivially 8128 // copyable. 8129 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8130 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8131 ClassDecl->setFailedImplicitMoveAssignment(); 8132 return 0; 8133 } 8134 8135 // Note: The following rules are largely analoguous to the move 8136 // constructor rules. 8137 8138 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8139 QualType RetType = Context.getLValueReferenceType(ArgType); 8140 ArgType = Context.getRValueReferenceType(ArgType); 8141 8142 // An implicitly-declared move assignment operator is an inline public 8143 // member of its class. 8144 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8145 SourceLocation ClassLoc = ClassDecl->getLocation(); 8146 DeclarationNameInfo NameInfo(Name, ClassLoc); 8147 CXXMethodDecl *MoveAssignment 8148 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8149 /*TInfo=*/0, /*isStatic=*/false, 8150 /*StorageClassAsWritten=*/SC_None, 8151 /*isInline=*/true, 8152 /*isConstexpr=*/false, 8153 SourceLocation()); 8154 MoveAssignment->setAccess(AS_public); 8155 MoveAssignment->setDefaulted(); 8156 MoveAssignment->setImplicit(); 8157 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8158 8159 // Build an exception specification pointing back at this member. 8160 FunctionProtoType::ExtProtoInfo EPI; 8161 EPI.ExceptionSpecType = EST_Unevaluated; 8162 EPI.ExceptionSpecDecl = MoveAssignment; 8163 MoveAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 8164 8165 // Add the parameter to the operator. 8166 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8167 ClassLoc, ClassLoc, /*Id=*/0, 8168 ArgType, /*TInfo=*/0, 8169 SC_None, 8170 SC_None, 0); 8171 MoveAssignment->setParams(FromParam); 8172 8173 // Note that we have added this copy-assignment operator. 8174 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8175 8176 // C++0x [class.copy]p9: 8177 // If the definition of a class X does not explicitly declare a move 8178 // assignment operator, one will be implicitly declared as defaulted if and 8179 // only if: 8180 // [...] 8181 // - the move assignment operator would not be implicitly defined as 8182 // deleted. 8183 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8184 // Cache this result so that we don't try to generate this over and over 8185 // on every lookup, leaking memory and wasting time. 8186 ClassDecl->setFailedImplicitMoveAssignment(); 8187 return 0; 8188 } 8189 8190 if (Scope *S = getScopeForContext(ClassDecl)) 8191 PushOnScopeChains(MoveAssignment, S, false); 8192 ClassDecl->addDecl(MoveAssignment); 8193 8194 AddOverriddenMethods(ClassDecl, MoveAssignment); 8195 return MoveAssignment; 8196 } 8197 8198 void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8199 CXXMethodDecl *MoveAssignOperator) { 8200 assert((MoveAssignOperator->isDefaulted() && 8201 MoveAssignOperator->isOverloadedOperator() && 8202 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8203 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8204 !MoveAssignOperator->isDeleted()) && 8205 "DefineImplicitMoveAssignment called for wrong function"); 8206 8207 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8208 8209 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8210 MoveAssignOperator->setInvalidDecl(); 8211 return; 8212 } 8213 8214 MoveAssignOperator->setUsed(); 8215 8216 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8217 DiagnosticErrorTrap Trap(Diags); 8218 8219 // C++0x [class.copy]p28: 8220 // The implicitly-defined or move assignment operator for a non-union class 8221 // X performs memberwise move assignment of its subobjects. The direct base 8222 // classes of X are assigned first, in the order of their declaration in the 8223 // base-specifier-list, and then the immediate non-static data members of X 8224 // are assigned, in the order in which they were declared in the class 8225 // definition. 8226 8227 // The statements that form the synthesized function body. 8228 SmallVector<Stmt*, 8> Statements; 8229 8230 // The parameter for the "other" object, which we are move from. 8231 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8232 QualType OtherRefType = Other->getType()-> 8233 getAs<RValueReferenceType>()->getPointeeType(); 8234 assert(OtherRefType.getQualifiers() == 0 && 8235 "Bad argument type of defaulted move assignment"); 8236 8237 // Our location for everything implicitly-generated. 8238 SourceLocation Loc = MoveAssignOperator->getLocation(); 8239 8240 // Construct a reference to the "other" object. We'll be using this 8241 // throughout the generated ASTs. 8242 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8243 assert(OtherRef && "Reference to parameter cannot fail!"); 8244 // Cast to rvalue. 8245 OtherRef = CastForMoving(*this, OtherRef); 8246 8247 // Construct the "this" pointer. We'll be using this throughout the generated 8248 // ASTs. 8249 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8250 assert(This && "Reference to this cannot fail!"); 8251 8252 // Assign base classes. 8253 bool Invalid = false; 8254 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8255 E = ClassDecl->bases_end(); Base != E; ++Base) { 8256 // Form the assignment: 8257 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8258 QualType BaseType = Base->getType().getUnqualifiedType(); 8259 if (!BaseType->isRecordType()) { 8260 Invalid = true; 8261 continue; 8262 } 8263 8264 CXXCastPath BasePath; 8265 BasePath.push_back(Base); 8266 8267 // Construct the "from" expression, which is an implicit cast to the 8268 // appropriately-qualified base type. 8269 Expr *From = OtherRef; 8270 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8271 VK_XValue, &BasePath).take(); 8272 8273 // Dereference "this". 8274 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8275 8276 // Implicitly cast "this" to the appropriately-qualified base type. 8277 To = ImpCastExprToType(To.take(), 8278 Context.getCVRQualifiedType(BaseType, 8279 MoveAssignOperator->getTypeQualifiers()), 8280 CK_UncheckedDerivedToBase, 8281 VK_LValue, &BasePath); 8282 8283 // Build the move. 8284 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8285 To.get(), From, 8286 /*CopyingBaseSubobject=*/true, 8287 /*Copying=*/false); 8288 if (Move.isInvalid()) { 8289 Diag(CurrentLocation, diag::note_member_synthesized_at) 8290 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8291 MoveAssignOperator->setInvalidDecl(); 8292 return; 8293 } 8294 8295 // Success! Record the move. 8296 Statements.push_back(Move.takeAs<Expr>()); 8297 } 8298 8299 // \brief Reference to the __builtin_memcpy function. 8300 Expr *BuiltinMemCpyRef = 0; 8301 // \brief Reference to the __builtin_objc_memmove_collectable function. 8302 Expr *CollectableMemCpyRef = 0; 8303 8304 // Assign non-static members. 8305 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8306 FieldEnd = ClassDecl->field_end(); 8307 Field != FieldEnd; ++Field) { 8308 if (Field->isUnnamedBitfield()) 8309 continue; 8310 8311 // Check for members of reference type; we can't move those. 8312 if (Field->getType()->isReferenceType()) { 8313 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8314 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8315 Diag(Field->getLocation(), diag::note_declared_at); 8316 Diag(CurrentLocation, diag::note_member_synthesized_at) 8317 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8318 Invalid = true; 8319 continue; 8320 } 8321 8322 // Check for members of const-qualified, non-class type. 8323 QualType BaseType = Context.getBaseElementType(Field->getType()); 8324 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8325 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8326 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8327 Diag(Field->getLocation(), diag::note_declared_at); 8328 Diag(CurrentLocation, diag::note_member_synthesized_at) 8329 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8330 Invalid = true; 8331 continue; 8332 } 8333 8334 // Suppress assigning zero-width bitfields. 8335 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8336 continue; 8337 8338 QualType FieldType = Field->getType().getNonReferenceType(); 8339 if (FieldType->isIncompleteArrayType()) { 8340 assert(ClassDecl->hasFlexibleArrayMember() && 8341 "Incomplete array type is not valid"); 8342 continue; 8343 } 8344 8345 // Build references to the field in the object we're copying from and to. 8346 CXXScopeSpec SS; // Intentionally empty 8347 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8348 LookupMemberName); 8349 MemberLookup.addDecl(*Field); 8350 MemberLookup.resolveKind(); 8351 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8352 Loc, /*IsArrow=*/false, 8353 SS, SourceLocation(), 0, 8354 MemberLookup, 0); 8355 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8356 Loc, /*IsArrow=*/true, 8357 SS, SourceLocation(), 0, 8358 MemberLookup, 0); 8359 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8360 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8361 8362 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8363 "Member reference with rvalue base must be rvalue except for reference " 8364 "members, which aren't allowed for move assignment."); 8365 8366 // If the field should be copied with __builtin_memcpy rather than via 8367 // explicit assignments, do so. This optimization only applies for arrays 8368 // of scalars and arrays of class type with trivial move-assignment 8369 // operators. 8370 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8371 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8372 // Compute the size of the memory buffer to be copied. 8373 QualType SizeType = Context.getSizeType(); 8374 llvm::APInt Size(Context.getTypeSize(SizeType), 8375 Context.getTypeSizeInChars(BaseType).getQuantity()); 8376 for (const ConstantArrayType *Array 8377 = Context.getAsConstantArrayType(FieldType); 8378 Array; 8379 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8380 llvm::APInt ArraySize 8381 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8382 Size *= ArraySize; 8383 } 8384 8385 // Take the address of the field references for "from" and "to". We 8386 // directly construct UnaryOperators here because semantic analysis 8387 // does not permit us to take the address of an xvalue. 8388 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8389 Context.getPointerType(From.get()->getType()), 8390 VK_RValue, OK_Ordinary, Loc); 8391 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8392 Context.getPointerType(To.get()->getType()), 8393 VK_RValue, OK_Ordinary, Loc); 8394 8395 bool NeedsCollectableMemCpy = 8396 (BaseType->isRecordType() && 8397 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8398 8399 if (NeedsCollectableMemCpy) { 8400 if (!CollectableMemCpyRef) { 8401 // Create a reference to the __builtin_objc_memmove_collectable function. 8402 LookupResult R(*this, 8403 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8404 Loc, LookupOrdinaryName); 8405 LookupName(R, TUScope, true); 8406 8407 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8408 if (!CollectableMemCpy) { 8409 // Something went horribly wrong earlier, and we will have 8410 // complained about it. 8411 Invalid = true; 8412 continue; 8413 } 8414 8415 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8416 Context.BuiltinFnTy, 8417 VK_RValue, Loc, 0).take(); 8418 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8419 } 8420 } 8421 // Create a reference to the __builtin_memcpy builtin function. 8422 else if (!BuiltinMemCpyRef) { 8423 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8424 LookupOrdinaryName); 8425 LookupName(R, TUScope, true); 8426 8427 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8428 if (!BuiltinMemCpy) { 8429 // Something went horribly wrong earlier, and we will have complained 8430 // about it. 8431 Invalid = true; 8432 continue; 8433 } 8434 8435 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8436 Context.BuiltinFnTy, 8437 VK_RValue, Loc, 0).take(); 8438 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8439 } 8440 8441 SmallVector<Expr*, 8> CallArgs; 8442 CallArgs.push_back(To.takeAs<Expr>()); 8443 CallArgs.push_back(From.takeAs<Expr>()); 8444 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8445 ExprResult Call = ExprError(); 8446 if (NeedsCollectableMemCpy) 8447 Call = ActOnCallExpr(/*Scope=*/0, 8448 CollectableMemCpyRef, 8449 Loc, CallArgs, 8450 Loc); 8451 else 8452 Call = ActOnCallExpr(/*Scope=*/0, 8453 BuiltinMemCpyRef, 8454 Loc, CallArgs, 8455 Loc); 8456 8457 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8458 Statements.push_back(Call.takeAs<Expr>()); 8459 continue; 8460 } 8461 8462 // Build the move of this field. 8463 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8464 To.get(), From.get(), 8465 /*CopyingBaseSubobject=*/false, 8466 /*Copying=*/false); 8467 if (Move.isInvalid()) { 8468 Diag(CurrentLocation, diag::note_member_synthesized_at) 8469 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8470 MoveAssignOperator->setInvalidDecl(); 8471 return; 8472 } 8473 8474 // Success! Record the copy. 8475 Statements.push_back(Move.takeAs<Stmt>()); 8476 } 8477 8478 if (!Invalid) { 8479 // Add a "return *this;" 8480 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8481 8482 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8483 if (Return.isInvalid()) 8484 Invalid = true; 8485 else { 8486 Statements.push_back(Return.takeAs<Stmt>()); 8487 8488 if (Trap.hasErrorOccurred()) { 8489 Diag(CurrentLocation, diag::note_member_synthesized_at) 8490 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8491 Invalid = true; 8492 } 8493 } 8494 } 8495 8496 if (Invalid) { 8497 MoveAssignOperator->setInvalidDecl(); 8498 return; 8499 } 8500 8501 StmtResult Body; 8502 { 8503 CompoundScopeRAII CompoundScope(*this); 8504 Body = ActOnCompoundStmt(Loc, Loc, Statements, 8505 /*isStmtExpr=*/false); 8506 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8507 } 8508 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8509 8510 if (ASTMutationListener *L = getASTMutationListener()) { 8511 L->CompletedImplicitDefinition(MoveAssignOperator); 8512 } 8513 } 8514 8515 /// Determine whether an implicit copy constructor for ClassDecl has a const 8516 /// argument. 8517 /// FIXME: It ought to be possible to store this on the record. 8518 static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl) { 8519 if (ClassDecl->isInvalidDecl()) 8520 return true; 8521 8522 // C++ [class.copy]p5: 8523 // The implicitly-declared copy constructor for a class X will 8524 // have the form 8525 // 8526 // X::X(const X&) 8527 // 8528 // if 8529 // -- each direct or virtual base class B of X has a copy 8530 // constructor whose first parameter is of type const B& or 8531 // const volatile B&, and 8532 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8533 BaseEnd = ClassDecl->bases_end(); 8534 Base != BaseEnd; ++Base) { 8535 // Virtual bases are handled below. 8536 if (Base->isVirtual()) 8537 continue; 8538 8539 CXXRecordDecl *BaseClassDecl 8540 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8541 // FIXME: This lookup is wrong. If the copy ctor for a member or base is 8542 // ambiguous, we should still produce a constructor with a const-qualified 8543 // parameter. 8544 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const)) 8545 return false; 8546 } 8547 8548 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8549 BaseEnd = ClassDecl->vbases_end(); 8550 Base != BaseEnd; ++Base) { 8551 CXXRecordDecl *BaseClassDecl 8552 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8553 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const)) 8554 return false; 8555 } 8556 8557 // -- for all the nonstatic data members of X that are of a 8558 // class type M (or array thereof), each such class type 8559 // has a copy constructor whose first parameter is of type 8560 // const M& or const volatile M&. 8561 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8562 FieldEnd = ClassDecl->field_end(); 8563 Field != FieldEnd; ++Field) { 8564 QualType FieldType = S.Context.getBaseElementType(Field->getType()); 8565 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8566 if (!S.LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const)) 8567 return false; 8568 } 8569 } 8570 8571 // Otherwise, the implicitly declared copy constructor will have 8572 // the form 8573 // 8574 // X::X(X&) 8575 8576 return true; 8577 } 8578 8579 Sema::ImplicitExceptionSpecification 8580 Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 8581 CXXRecordDecl *ClassDecl = MD->getParent(); 8582 8583 ImplicitExceptionSpecification ExceptSpec(*this); 8584 if (ClassDecl->isInvalidDecl()) 8585 return ExceptSpec; 8586 8587 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 8588 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 8589 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 8590 8591 // C++ [except.spec]p14: 8592 // An implicitly declared special member function (Clause 12) shall have an 8593 // exception-specification. [...] 8594 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8595 BaseEnd = ClassDecl->bases_end(); 8596 Base != BaseEnd; 8597 ++Base) { 8598 // Virtual bases are handled below. 8599 if (Base->isVirtual()) 8600 continue; 8601 8602 CXXRecordDecl *BaseClassDecl 8603 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8604 if (CXXConstructorDecl *CopyConstructor = 8605 LookupCopyingConstructor(BaseClassDecl, Quals)) 8606 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8607 } 8608 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8609 BaseEnd = ClassDecl->vbases_end(); 8610 Base != BaseEnd; 8611 ++Base) { 8612 CXXRecordDecl *BaseClassDecl 8613 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8614 if (CXXConstructorDecl *CopyConstructor = 8615 LookupCopyingConstructor(BaseClassDecl, Quals)) 8616 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8617 } 8618 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8619 FieldEnd = ClassDecl->field_end(); 8620 Field != FieldEnd; 8621 ++Field) { 8622 QualType FieldType = Context.getBaseElementType(Field->getType()); 8623 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8624 if (CXXConstructorDecl *CopyConstructor = 8625 LookupCopyingConstructor(FieldClassDecl, 8626 Quals | FieldType.getCVRQualifiers())) 8627 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 8628 } 8629 } 8630 8631 return ExceptSpec; 8632 } 8633 8634 CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8635 CXXRecordDecl *ClassDecl) { 8636 // C++ [class.copy]p4: 8637 // If the class definition does not explicitly declare a copy 8638 // constructor, one is declared implicitly. 8639 8640 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8641 QualType ArgType = ClassType; 8642 bool Const = isImplicitCopyCtorArgConst(*this, ClassDecl); 8643 if (Const) 8644 ArgType = ArgType.withConst(); 8645 ArgType = Context.getLValueReferenceType(ArgType); 8646 8647 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8648 CXXCopyConstructor, 8649 Const); 8650 8651 DeclarationName Name 8652 = Context.DeclarationNames.getCXXConstructorName( 8653 Context.getCanonicalType(ClassType)); 8654 SourceLocation ClassLoc = ClassDecl->getLocation(); 8655 DeclarationNameInfo NameInfo(Name, ClassLoc); 8656 8657 // An implicitly-declared copy constructor is an inline public 8658 // member of its class. 8659 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8660 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 8661 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8662 Constexpr); 8663 CopyConstructor->setAccess(AS_public); 8664 CopyConstructor->setDefaulted(); 8665 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8666 8667 // Build an exception specification pointing back at this member. 8668 FunctionProtoType::ExtProtoInfo EPI; 8669 EPI.ExceptionSpecType = EST_Unevaluated; 8670 EPI.ExceptionSpecDecl = CopyConstructor; 8671 CopyConstructor->setType( 8672 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 8673 8674 // Note that we have declared this constructor. 8675 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8676 8677 // Add the parameter to the constructor. 8678 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8679 ClassLoc, ClassLoc, 8680 /*IdentifierInfo=*/0, 8681 ArgType, /*TInfo=*/0, 8682 SC_None, 8683 SC_None, 0); 8684 CopyConstructor->setParams(FromParam); 8685 8686 if (Scope *S = getScopeForContext(ClassDecl)) 8687 PushOnScopeChains(CopyConstructor, S, false); 8688 ClassDecl->addDecl(CopyConstructor); 8689 8690 // C++11 [class.copy]p8: 8691 // ... If the class definition does not explicitly declare a copy 8692 // constructor, there is no user-declared move constructor, and there is no 8693 // user-declared move assignment operator, a copy constructor is implicitly 8694 // declared as defaulted. 8695 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8696 CopyConstructor->setDeletedAsWritten(); 8697 8698 return CopyConstructor; 8699 } 8700 8701 void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8702 CXXConstructorDecl *CopyConstructor) { 8703 assert((CopyConstructor->isDefaulted() && 8704 CopyConstructor->isCopyConstructor() && 8705 !CopyConstructor->doesThisDeclarationHaveABody() && 8706 !CopyConstructor->isDeleted()) && 8707 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8708 8709 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8710 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8711 8712 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8713 DiagnosticErrorTrap Trap(Diags); 8714 8715 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8716 Trap.hasErrorOccurred()) { 8717 Diag(CurrentLocation, diag::note_member_synthesized_at) 8718 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8719 CopyConstructor->setInvalidDecl(); 8720 } else { 8721 Sema::CompoundScopeRAII CompoundScope(*this); 8722 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8723 CopyConstructor->getLocation(), 8724 MultiStmtArg(), 8725 /*isStmtExpr=*/false) 8726 .takeAs<Stmt>()); 8727 CopyConstructor->setImplicitlyDefined(true); 8728 } 8729 8730 CopyConstructor->setUsed(); 8731 if (ASTMutationListener *L = getASTMutationListener()) { 8732 L->CompletedImplicitDefinition(CopyConstructor); 8733 } 8734 } 8735 8736 Sema::ImplicitExceptionSpecification 8737 Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 8738 CXXRecordDecl *ClassDecl = MD->getParent(); 8739 8740 // C++ [except.spec]p14: 8741 // An implicitly declared special member function (Clause 12) shall have an 8742 // exception-specification. [...] 8743 ImplicitExceptionSpecification ExceptSpec(*this); 8744 if (ClassDecl->isInvalidDecl()) 8745 return ExceptSpec; 8746 8747 // Direct base-class constructors. 8748 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8749 BEnd = ClassDecl->bases_end(); 8750 B != BEnd; ++B) { 8751 if (B->isVirtual()) // Handled below. 8752 continue; 8753 8754 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8755 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8756 CXXConstructorDecl *Constructor = 8757 LookupMovingConstructor(BaseClassDecl, 0); 8758 // If this is a deleted function, add it anyway. This might be conformant 8759 // with the standard. This might not. I'm not sure. It might not matter. 8760 if (Constructor) 8761 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8762 } 8763 } 8764 8765 // Virtual base-class constructors. 8766 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8767 BEnd = ClassDecl->vbases_end(); 8768 B != BEnd; ++B) { 8769 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8770 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8771 CXXConstructorDecl *Constructor = 8772 LookupMovingConstructor(BaseClassDecl, 0); 8773 // If this is a deleted function, add it anyway. This might be conformant 8774 // with the standard. This might not. I'm not sure. It might not matter. 8775 if (Constructor) 8776 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8777 } 8778 } 8779 8780 // Field constructors. 8781 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8782 FEnd = ClassDecl->field_end(); 8783 F != FEnd; ++F) { 8784 QualType FieldType = Context.getBaseElementType(F->getType()); 8785 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 8786 CXXConstructorDecl *Constructor = 8787 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 8788 // If this is a deleted function, add it anyway. This might be conformant 8789 // with the standard. This might not. I'm not sure. It might not matter. 8790 // In particular, the problem is that this function never gets called. It 8791 // might just be ill-formed because this function attempts to refer to 8792 // a deleted function here. 8793 if (Constructor) 8794 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 8795 } 8796 } 8797 8798 return ExceptSpec; 8799 } 8800 8801 CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8802 CXXRecordDecl *ClassDecl) { 8803 // C++11 [class.copy]p9: 8804 // If the definition of a class X does not explicitly declare a move 8805 // constructor, one will be implicitly declared as defaulted if and only if: 8806 // 8807 // - [first 4 bullets] 8808 assert(ClassDecl->needsImplicitMoveConstructor()); 8809 8810 // [Checked after we build the declaration] 8811 // - the move assignment operator would not be implicitly defined as 8812 // deleted, 8813 8814 // [DR1402]: 8815 // - each of X's non-static data members and direct or virtual base classes 8816 // has a type that either has a move constructor or is trivially copyable. 8817 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 8818 ClassDecl->setFailedImplicitMoveConstructor(); 8819 return 0; 8820 } 8821 8822 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8823 QualType ArgType = Context.getRValueReferenceType(ClassType); 8824 8825 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8826 CXXMoveConstructor, 8827 false); 8828 8829 DeclarationName Name 8830 = Context.DeclarationNames.getCXXConstructorName( 8831 Context.getCanonicalType(ClassType)); 8832 SourceLocation ClassLoc = ClassDecl->getLocation(); 8833 DeclarationNameInfo NameInfo(Name, ClassLoc); 8834 8835 // C++0x [class.copy]p11: 8836 // An implicitly-declared copy/move constructor is an inline public 8837 // member of its class. 8838 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8839 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 8840 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8841 Constexpr); 8842 MoveConstructor->setAccess(AS_public); 8843 MoveConstructor->setDefaulted(); 8844 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8845 8846 // Build an exception specification pointing back at this member. 8847 FunctionProtoType::ExtProtoInfo EPI; 8848 EPI.ExceptionSpecType = EST_Unevaluated; 8849 EPI.ExceptionSpecDecl = MoveConstructor; 8850 MoveConstructor->setType( 8851 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 8852 8853 // Add the parameter to the constructor. 8854 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8855 ClassLoc, ClassLoc, 8856 /*IdentifierInfo=*/0, 8857 ArgType, /*TInfo=*/0, 8858 SC_None, 8859 SC_None, 0); 8860 MoveConstructor->setParams(FromParam); 8861 8862 // C++0x [class.copy]p9: 8863 // If the definition of a class X does not explicitly declare a move 8864 // constructor, one will be implicitly declared as defaulted if and only if: 8865 // [...] 8866 // - the move constructor would not be implicitly defined as deleted. 8867 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8868 // Cache this result so that we don't try to generate this over and over 8869 // on every lookup, leaking memory and wasting time. 8870 ClassDecl->setFailedImplicitMoveConstructor(); 8871 return 0; 8872 } 8873 8874 // Note that we have declared this constructor. 8875 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8876 8877 if (Scope *S = getScopeForContext(ClassDecl)) 8878 PushOnScopeChains(MoveConstructor, S, false); 8879 ClassDecl->addDecl(MoveConstructor); 8880 8881 return MoveConstructor; 8882 } 8883 8884 void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8885 CXXConstructorDecl *MoveConstructor) { 8886 assert((MoveConstructor->isDefaulted() && 8887 MoveConstructor->isMoveConstructor() && 8888 !MoveConstructor->doesThisDeclarationHaveABody() && 8889 !MoveConstructor->isDeleted()) && 8890 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8891 8892 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8893 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8894 8895 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8896 DiagnosticErrorTrap Trap(Diags); 8897 8898 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8899 Trap.hasErrorOccurred()) { 8900 Diag(CurrentLocation, diag::note_member_synthesized_at) 8901 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8902 MoveConstructor->setInvalidDecl(); 8903 } else { 8904 Sema::CompoundScopeRAII CompoundScope(*this); 8905 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8906 MoveConstructor->getLocation(), 8907 MultiStmtArg(), 8908 /*isStmtExpr=*/false) 8909 .takeAs<Stmt>()); 8910 MoveConstructor->setImplicitlyDefined(true); 8911 } 8912 8913 MoveConstructor->setUsed(); 8914 8915 if (ASTMutationListener *L = getASTMutationListener()) { 8916 L->CompletedImplicitDefinition(MoveConstructor); 8917 } 8918 } 8919 8920 bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 8921 return FD->isDeleted() && 8922 (FD->isDefaulted() || FD->isImplicit()) && 8923 isa<CXXMethodDecl>(FD); 8924 } 8925 8926 /// \brief Mark the call operator of the given lambda closure type as "used". 8927 static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 8928 CXXMethodDecl *CallOperator 8929 = cast<CXXMethodDecl>( 8930 *Lambda->lookup( 8931 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8932 CallOperator->setReferenced(); 8933 CallOperator->setUsed(); 8934 } 8935 8936 void Sema::DefineImplicitLambdaToFunctionPointerConversion( 8937 SourceLocation CurrentLocation, 8938 CXXConversionDecl *Conv) 8939 { 8940 CXXRecordDecl *Lambda = Conv->getParent(); 8941 8942 // Make sure that the lambda call operator is marked used. 8943 markLambdaCallOperatorUsed(*this, Lambda); 8944 8945 Conv->setUsed(); 8946 8947 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8948 DiagnosticErrorTrap Trap(Diags); 8949 8950 // Return the address of the __invoke function. 8951 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 8952 CXXMethodDecl *Invoke 8953 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 8954 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 8955 VK_LValue, Conv->getLocation()).take(); 8956 assert(FunctionRef && "Can't refer to __invoke function?"); 8957 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 8958 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 8959 Conv->getLocation(), 8960 Conv->getLocation())); 8961 8962 // Fill in the __invoke function with a dummy implementation. IR generation 8963 // will fill in the actual details. 8964 Invoke->setUsed(); 8965 Invoke->setReferenced(); 8966 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation())); 8967 8968 if (ASTMutationListener *L = getASTMutationListener()) { 8969 L->CompletedImplicitDefinition(Conv); 8970 L->CompletedImplicitDefinition(Invoke); 8971 } 8972 } 8973 8974 void Sema::DefineImplicitLambdaToBlockPointerConversion( 8975 SourceLocation CurrentLocation, 8976 CXXConversionDecl *Conv) 8977 { 8978 Conv->setUsed(); 8979 8980 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8981 DiagnosticErrorTrap Trap(Diags); 8982 8983 // Copy-initialize the lambda object as needed to capture it. 8984 Expr *This = ActOnCXXThis(CurrentLocation).take(); 8985 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 8986 8987 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 8988 Conv->getLocation(), 8989 Conv, DerefThis); 8990 8991 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 8992 // behavior. Note that only the general conversion function does this 8993 // (since it's unusable otherwise); in the case where we inline the 8994 // block literal, it has block literal lifetime semantics. 8995 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 8996 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 8997 CK_CopyAndAutoreleaseBlockObject, 8998 BuildBlock.get(), 0, VK_RValue); 8999 9000 if (BuildBlock.isInvalid()) { 9001 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9002 Conv->setInvalidDecl(); 9003 return; 9004 } 9005 9006 // Create the return statement that returns the block from the conversion 9007 // function. 9008 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 9009 if (Return.isInvalid()) { 9010 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9011 Conv->setInvalidDecl(); 9012 return; 9013 } 9014 9015 // Set the body of the conversion function. 9016 Stmt *ReturnS = Return.take(); 9017 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 9018 Conv->getLocation(), 9019 Conv->getLocation())); 9020 9021 // We're done; notify the mutation listener, if any. 9022 if (ASTMutationListener *L = getASTMutationListener()) { 9023 L->CompletedImplicitDefinition(Conv); 9024 } 9025 } 9026 9027 /// \brief Determine whether the given list arguments contains exactly one 9028 /// "real" (non-default) argument. 9029 static bool hasOneRealArgument(MultiExprArg Args) { 9030 switch (Args.size()) { 9031 case 0: 9032 return false; 9033 9034 default: 9035 if (!Args[1]->isDefaultArgument()) 9036 return false; 9037 9038 // fall through 9039 case 1: 9040 return !Args[0]->isDefaultArgument(); 9041 } 9042 9043 return false; 9044 } 9045 9046 ExprResult 9047 Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9048 CXXConstructorDecl *Constructor, 9049 MultiExprArg ExprArgs, 9050 bool HadMultipleCandidates, 9051 bool RequiresZeroInit, 9052 unsigned ConstructKind, 9053 SourceRange ParenRange) { 9054 bool Elidable = false; 9055 9056 // C++0x [class.copy]p34: 9057 // When certain criteria are met, an implementation is allowed to 9058 // omit the copy/move construction of a class object, even if the 9059 // copy/move constructor and/or destructor for the object have 9060 // side effects. [...] 9061 // - when a temporary class object that has not been bound to a 9062 // reference (12.2) would be copied/moved to a class object 9063 // with the same cv-unqualified type, the copy/move operation 9064 // can be omitted by constructing the temporary object 9065 // directly into the target of the omitted copy/move 9066 if (ConstructKind == CXXConstructExpr::CK_Complete && 9067 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9068 Expr *SubExpr = ExprArgs[0]; 9069 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9070 } 9071 9072 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9073 Elidable, ExprArgs, HadMultipleCandidates, 9074 RequiresZeroInit, ConstructKind, ParenRange); 9075 } 9076 9077 /// BuildCXXConstructExpr - Creates a complete call to a constructor, 9078 /// including handling of its default argument expressions. 9079 ExprResult 9080 Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9081 CXXConstructorDecl *Constructor, bool Elidable, 9082 MultiExprArg ExprArgs, 9083 bool HadMultipleCandidates, 9084 bool RequiresZeroInit, 9085 unsigned ConstructKind, 9086 SourceRange ParenRange) { 9087 MarkFunctionReferenced(ConstructLoc, Constructor); 9088 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9089 Constructor, Elidable, ExprArgs, 9090 HadMultipleCandidates, /*FIXME*/false, 9091 RequiresZeroInit, 9092 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9093 ParenRange)); 9094 } 9095 9096 bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9097 CXXConstructorDecl *Constructor, 9098 MultiExprArg Exprs, 9099 bool HadMultipleCandidates) { 9100 // FIXME: Provide the correct paren SourceRange when available. 9101 ExprResult TempResult = 9102 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9103 Exprs, HadMultipleCandidates, false, 9104 CXXConstructExpr::CK_Complete, SourceRange()); 9105 if (TempResult.isInvalid()) 9106 return true; 9107 9108 Expr *Temp = TempResult.takeAs<Expr>(); 9109 CheckImplicitConversions(Temp, VD->getLocation()); 9110 MarkFunctionReferenced(VD->getLocation(), Constructor); 9111 Temp = MaybeCreateExprWithCleanups(Temp); 9112 VD->setInit(Temp); 9113 9114 return false; 9115 } 9116 9117 void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9118 if (VD->isInvalidDecl()) return; 9119 9120 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9121 if (ClassDecl->isInvalidDecl()) return; 9122 if (ClassDecl->hasIrrelevantDestructor()) return; 9123 if (ClassDecl->isDependentContext()) return; 9124 9125 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9126 MarkFunctionReferenced(VD->getLocation(), Destructor); 9127 CheckDestructorAccess(VD->getLocation(), Destructor, 9128 PDiag(diag::err_access_dtor_var) 9129 << VD->getDeclName() 9130 << VD->getType()); 9131 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9132 9133 if (!VD->hasGlobalStorage()) return; 9134 9135 // Emit warning for non-trivial dtor in global scope (a real global, 9136 // class-static, function-static). 9137 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9138 9139 // TODO: this should be re-enabled for static locals by !CXAAtExit 9140 if (!VD->isStaticLocal()) 9141 Diag(VD->getLocation(), diag::warn_global_destructor); 9142 } 9143 9144 /// \brief Given a constructor and the set of arguments provided for the 9145 /// constructor, convert the arguments and add any required default arguments 9146 /// to form a proper call to this constructor. 9147 /// 9148 /// \returns true if an error occurred, false otherwise. 9149 bool 9150 Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9151 MultiExprArg ArgsPtr, 9152 SourceLocation Loc, 9153 SmallVectorImpl<Expr*> &ConvertedArgs, 9154 bool AllowExplicit) { 9155 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9156 unsigned NumArgs = ArgsPtr.size(); 9157 Expr **Args = ArgsPtr.data(); 9158 9159 const FunctionProtoType *Proto 9160 = Constructor->getType()->getAs<FunctionProtoType>(); 9161 assert(Proto && "Constructor without a prototype?"); 9162 unsigned NumArgsInProto = Proto->getNumArgs(); 9163 9164 // If too few arguments are available, we'll fill in the rest with defaults. 9165 if (NumArgs < NumArgsInProto) 9166 ConvertedArgs.reserve(NumArgsInProto); 9167 else 9168 ConvertedArgs.reserve(NumArgs); 9169 9170 VariadicCallType CallType = 9171 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9172 SmallVector<Expr *, 8> AllArgs; 9173 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9174 Proto, 0, Args, NumArgs, AllArgs, 9175 CallType, AllowExplicit); 9176 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9177 9178 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9179 9180 CheckConstructorCall(Constructor, AllArgs.data(), AllArgs.size(), 9181 Proto, Loc); 9182 9183 return Invalid; 9184 } 9185 9186 static inline bool 9187 CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9188 const FunctionDecl *FnDecl) { 9189 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9190 if (isa<NamespaceDecl>(DC)) { 9191 return SemaRef.Diag(FnDecl->getLocation(), 9192 diag::err_operator_new_delete_declared_in_namespace) 9193 << FnDecl->getDeclName(); 9194 } 9195 9196 if (isa<TranslationUnitDecl>(DC) && 9197 FnDecl->getStorageClass() == SC_Static) { 9198 return SemaRef.Diag(FnDecl->getLocation(), 9199 diag::err_operator_new_delete_declared_static) 9200 << FnDecl->getDeclName(); 9201 } 9202 9203 return false; 9204 } 9205 9206 static inline bool 9207 CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9208 CanQualType ExpectedResultType, 9209 CanQualType ExpectedFirstParamType, 9210 unsigned DependentParamTypeDiag, 9211 unsigned InvalidParamTypeDiag) { 9212 QualType ResultType = 9213 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9214 9215 // Check that the result type is not dependent. 9216 if (ResultType->isDependentType()) 9217 return SemaRef.Diag(FnDecl->getLocation(), 9218 diag::err_operator_new_delete_dependent_result_type) 9219 << FnDecl->getDeclName() << ExpectedResultType; 9220 9221 // Check that the result type is what we expect. 9222 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9223 return SemaRef.Diag(FnDecl->getLocation(), 9224 diag::err_operator_new_delete_invalid_result_type) 9225 << FnDecl->getDeclName() << ExpectedResultType; 9226 9227 // A function template must have at least 2 parameters. 9228 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9229 return SemaRef.Diag(FnDecl->getLocation(), 9230 diag::err_operator_new_delete_template_too_few_parameters) 9231 << FnDecl->getDeclName(); 9232 9233 // The function decl must have at least 1 parameter. 9234 if (FnDecl->getNumParams() == 0) 9235 return SemaRef.Diag(FnDecl->getLocation(), 9236 diag::err_operator_new_delete_too_few_parameters) 9237 << FnDecl->getDeclName(); 9238 9239 // Check the first parameter type is not dependent. 9240 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9241 if (FirstParamType->isDependentType()) 9242 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9243 << FnDecl->getDeclName() << ExpectedFirstParamType; 9244 9245 // Check that the first parameter type is what we expect. 9246 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9247 ExpectedFirstParamType) 9248 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9249 << FnDecl->getDeclName() << ExpectedFirstParamType; 9250 9251 return false; 9252 } 9253 9254 static bool 9255 CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9256 // C++ [basic.stc.dynamic.allocation]p1: 9257 // A program is ill-formed if an allocation function is declared in a 9258 // namespace scope other than global scope or declared static in global 9259 // scope. 9260 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9261 return true; 9262 9263 CanQualType SizeTy = 9264 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9265 9266 // C++ [basic.stc.dynamic.allocation]p1: 9267 // The return type shall be void*. The first parameter shall have type 9268 // std::size_t. 9269 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9270 SizeTy, 9271 diag::err_operator_new_dependent_param_type, 9272 diag::err_operator_new_param_type)) 9273 return true; 9274 9275 // C++ [basic.stc.dynamic.allocation]p1: 9276 // The first parameter shall not have an associated default argument. 9277 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9278 return SemaRef.Diag(FnDecl->getLocation(), 9279 diag::err_operator_new_default_arg) 9280 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9281 9282 return false; 9283 } 9284 9285 static bool 9286 CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9287 // C++ [basic.stc.dynamic.deallocation]p1: 9288 // A program is ill-formed if deallocation functions are declared in a 9289 // namespace scope other than global scope or declared static in global 9290 // scope. 9291 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9292 return true; 9293 9294 // C++ [basic.stc.dynamic.deallocation]p2: 9295 // Each deallocation function shall return void and its first parameter 9296 // shall be void*. 9297 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9298 SemaRef.Context.VoidPtrTy, 9299 diag::err_operator_delete_dependent_param_type, 9300 diag::err_operator_delete_param_type)) 9301 return true; 9302 9303 return false; 9304 } 9305 9306 /// CheckOverloadedOperatorDeclaration - Check whether the declaration 9307 /// of this overloaded operator is well-formed. If so, returns false; 9308 /// otherwise, emits appropriate diagnostics and returns true. 9309 bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9310 assert(FnDecl && FnDecl->isOverloadedOperator() && 9311 "Expected an overloaded operator declaration"); 9312 9313 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9314 9315 // C++ [over.oper]p5: 9316 // The allocation and deallocation functions, operator new, 9317 // operator new[], operator delete and operator delete[], are 9318 // described completely in 3.7.3. The attributes and restrictions 9319 // found in the rest of this subclause do not apply to them unless 9320 // explicitly stated in 3.7.3. 9321 if (Op == OO_Delete || Op == OO_Array_Delete) 9322 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9323 9324 if (Op == OO_New || Op == OO_Array_New) 9325 return CheckOperatorNewDeclaration(*this, FnDecl); 9326 9327 // C++ [over.oper]p6: 9328 // An operator function shall either be a non-static member 9329 // function or be a non-member function and have at least one 9330 // parameter whose type is a class, a reference to a class, an 9331 // enumeration, or a reference to an enumeration. 9332 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9333 if (MethodDecl->isStatic()) 9334 return Diag(FnDecl->getLocation(), 9335 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9336 } else { 9337 bool ClassOrEnumParam = false; 9338 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9339 ParamEnd = FnDecl->param_end(); 9340 Param != ParamEnd; ++Param) { 9341 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9342 if (ParamType->isDependentType() || ParamType->isRecordType() || 9343 ParamType->isEnumeralType()) { 9344 ClassOrEnumParam = true; 9345 break; 9346 } 9347 } 9348 9349 if (!ClassOrEnumParam) 9350 return Diag(FnDecl->getLocation(), 9351 diag::err_operator_overload_needs_class_or_enum) 9352 << FnDecl->getDeclName(); 9353 } 9354 9355 // C++ [over.oper]p8: 9356 // An operator function cannot have default arguments (8.3.6), 9357 // except where explicitly stated below. 9358 // 9359 // Only the function-call operator allows default arguments 9360 // (C++ [over.call]p1). 9361 if (Op != OO_Call) { 9362 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9363 Param != FnDecl->param_end(); ++Param) { 9364 if ((*Param)->hasDefaultArg()) 9365 return Diag((*Param)->getLocation(), 9366 diag::err_operator_overload_default_arg) 9367 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9368 } 9369 } 9370 9371 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9372 { false, false, false } 9373 #define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9374 , { Unary, Binary, MemberOnly } 9375 #include "clang/Basic/OperatorKinds.def" 9376 }; 9377 9378 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9379 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9380 bool MustBeMemberOperator = OperatorUses[Op][2]; 9381 9382 // C++ [over.oper]p8: 9383 // [...] Operator functions cannot have more or fewer parameters 9384 // than the number required for the corresponding operator, as 9385 // described in the rest of this subclause. 9386 unsigned NumParams = FnDecl->getNumParams() 9387 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9388 if (Op != OO_Call && 9389 ((NumParams == 1 && !CanBeUnaryOperator) || 9390 (NumParams == 2 && !CanBeBinaryOperator) || 9391 (NumParams < 1) || (NumParams > 2))) { 9392 // We have the wrong number of parameters. 9393 unsigned ErrorKind; 9394 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9395 ErrorKind = 2; // 2 -> unary or binary. 9396 } else if (CanBeUnaryOperator) { 9397 ErrorKind = 0; // 0 -> unary 9398 } else { 9399 assert(CanBeBinaryOperator && 9400 "All non-call overloaded operators are unary or binary!"); 9401 ErrorKind = 1; // 1 -> binary 9402 } 9403 9404 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9405 << FnDecl->getDeclName() << NumParams << ErrorKind; 9406 } 9407 9408 // Overloaded operators other than operator() cannot be variadic. 9409 if (Op != OO_Call && 9410 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9411 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9412 << FnDecl->getDeclName(); 9413 } 9414 9415 // Some operators must be non-static member functions. 9416 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9417 return Diag(FnDecl->getLocation(), 9418 diag::err_operator_overload_must_be_member) 9419 << FnDecl->getDeclName(); 9420 } 9421 9422 // C++ [over.inc]p1: 9423 // The user-defined function called operator++ implements the 9424 // prefix and postfix ++ operator. If this function is a member 9425 // function with no parameters, or a non-member function with one 9426 // parameter of class or enumeration type, it defines the prefix 9427 // increment operator ++ for objects of that type. If the function 9428 // is a member function with one parameter (which shall be of type 9429 // int) or a non-member function with two parameters (the second 9430 // of which shall be of type int), it defines the postfix 9431 // increment operator ++ for objects of that type. 9432 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9433 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9434 bool ParamIsInt = false; 9435 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9436 ParamIsInt = BT->getKind() == BuiltinType::Int; 9437 9438 if (!ParamIsInt) 9439 return Diag(LastParam->getLocation(), 9440 diag::err_operator_overload_post_incdec_must_be_int) 9441 << LastParam->getType() << (Op == OO_MinusMinus); 9442 } 9443 9444 return false; 9445 } 9446 9447 /// CheckLiteralOperatorDeclaration - Check whether the declaration 9448 /// of this literal operator function is well-formed. If so, returns 9449 /// false; otherwise, emits appropriate diagnostics and returns true. 9450 bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9451 if (isa<CXXMethodDecl>(FnDecl)) { 9452 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9453 << FnDecl->getDeclName(); 9454 return true; 9455 } 9456 9457 if (FnDecl->isExternC()) { 9458 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 9459 return true; 9460 } 9461 9462 bool Valid = false; 9463 9464 // This might be the definition of a literal operator template. 9465 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 9466 // This might be a specialization of a literal operator template. 9467 if (!TpDecl) 9468 TpDecl = FnDecl->getPrimaryTemplate(); 9469 9470 // template <char...> type operator "" name() is the only valid template 9471 // signature, and the only valid signature with no parameters. 9472 if (TpDecl) { 9473 if (FnDecl->param_size() == 0) { 9474 // Must have only one template parameter 9475 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9476 if (Params->size() == 1) { 9477 NonTypeTemplateParmDecl *PmDecl = 9478 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9479 9480 // The template parameter must be a char parameter pack. 9481 if (PmDecl && PmDecl->isTemplateParameterPack() && 9482 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9483 Valid = true; 9484 } 9485 } 9486 } else if (FnDecl->param_size()) { 9487 // Check the first parameter 9488 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9489 9490 QualType T = (*Param)->getType().getUnqualifiedType(); 9491 9492 // unsigned long long int, long double, and any character type are allowed 9493 // as the only parameters. 9494 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9495 Context.hasSameType(T, Context.LongDoubleTy) || 9496 Context.hasSameType(T, Context.CharTy) || 9497 Context.hasSameType(T, Context.WCharTy) || 9498 Context.hasSameType(T, Context.Char16Ty) || 9499 Context.hasSameType(T, Context.Char32Ty)) { 9500 if (++Param == FnDecl->param_end()) 9501 Valid = true; 9502 goto FinishedParams; 9503 } 9504 9505 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9506 const PointerType *PT = T->getAs<PointerType>(); 9507 if (!PT) 9508 goto FinishedParams; 9509 T = PT->getPointeeType(); 9510 if (!T.isConstQualified() || T.isVolatileQualified()) 9511 goto FinishedParams; 9512 T = T.getUnqualifiedType(); 9513 9514 // Move on to the second parameter; 9515 ++Param; 9516 9517 // If there is no second parameter, the first must be a const char * 9518 if (Param == FnDecl->param_end()) { 9519 if (Context.hasSameType(T, Context.CharTy)) 9520 Valid = true; 9521 goto FinishedParams; 9522 } 9523 9524 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9525 // are allowed as the first parameter to a two-parameter function 9526 if (!(Context.hasSameType(T, Context.CharTy) || 9527 Context.hasSameType(T, Context.WCharTy) || 9528 Context.hasSameType(T, Context.Char16Ty) || 9529 Context.hasSameType(T, Context.Char32Ty))) 9530 goto FinishedParams; 9531 9532 // The second and final parameter must be an std::size_t 9533 T = (*Param)->getType().getUnqualifiedType(); 9534 if (Context.hasSameType(T, Context.getSizeType()) && 9535 ++Param == FnDecl->param_end()) 9536 Valid = true; 9537 } 9538 9539 // FIXME: This diagnostic is absolutely terrible. 9540 FinishedParams: 9541 if (!Valid) { 9542 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9543 << FnDecl->getDeclName(); 9544 return true; 9545 } 9546 9547 // A parameter-declaration-clause containing a default argument is not 9548 // equivalent to any of the permitted forms. 9549 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9550 ParamEnd = FnDecl->param_end(); 9551 Param != ParamEnd; ++Param) { 9552 if ((*Param)->hasDefaultArg()) { 9553 Diag((*Param)->getDefaultArgRange().getBegin(), 9554 diag::err_literal_operator_default_argument) 9555 << (*Param)->getDefaultArgRange(); 9556 break; 9557 } 9558 } 9559 9560 StringRef LiteralName 9561 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9562 if (LiteralName[0] != '_') { 9563 // C++11 [usrlit.suffix]p1: 9564 // Literal suffix identifiers that do not start with an underscore 9565 // are reserved for future standardization. 9566 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9567 } 9568 9569 return false; 9570 } 9571 9572 /// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9573 /// linkage specification, including the language and (if present) 9574 /// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9575 /// the location of the language string literal, which is provided 9576 /// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9577 /// the '{' brace. Otherwise, this linkage specification does not 9578 /// have any braces. 9579 Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9580 SourceLocation LangLoc, 9581 StringRef Lang, 9582 SourceLocation LBraceLoc) { 9583 LinkageSpecDecl::LanguageIDs Language; 9584 if (Lang == "\"C\"") 9585 Language = LinkageSpecDecl::lang_c; 9586 else if (Lang == "\"C++\"") 9587 Language = LinkageSpecDecl::lang_cxx; 9588 else { 9589 Diag(LangLoc, diag::err_bad_language); 9590 return 0; 9591 } 9592 9593 // FIXME: Add all the various semantics of linkage specifications 9594 9595 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9596 ExternLoc, LangLoc, Language); 9597 CurContext->addDecl(D); 9598 PushDeclContext(S, D); 9599 return D; 9600 } 9601 9602 /// ActOnFinishLinkageSpecification - Complete the definition of 9603 /// the C++ linkage specification LinkageSpec. If RBraceLoc is 9604 /// valid, it's the position of the closing '}' brace in a linkage 9605 /// specification that uses braces. 9606 Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9607 Decl *LinkageSpec, 9608 SourceLocation RBraceLoc) { 9609 if (LinkageSpec) { 9610 if (RBraceLoc.isValid()) { 9611 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9612 LSDecl->setRBraceLoc(RBraceLoc); 9613 } 9614 PopDeclContext(); 9615 } 9616 return LinkageSpec; 9617 } 9618 9619 /// \brief Perform semantic analysis for the variable declaration that 9620 /// occurs within a C++ catch clause, returning the newly-created 9621 /// variable. 9622 VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9623 TypeSourceInfo *TInfo, 9624 SourceLocation StartLoc, 9625 SourceLocation Loc, 9626 IdentifierInfo *Name) { 9627 bool Invalid = false; 9628 QualType ExDeclType = TInfo->getType(); 9629 9630 // Arrays and functions decay. 9631 if (ExDeclType->isArrayType()) 9632 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9633 else if (ExDeclType->isFunctionType()) 9634 ExDeclType = Context.getPointerType(ExDeclType); 9635 9636 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9637 // The exception-declaration shall not denote a pointer or reference to an 9638 // incomplete type, other than [cv] void*. 9639 // N2844 forbids rvalue references. 9640 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9641 Diag(Loc, diag::err_catch_rvalue_ref); 9642 Invalid = true; 9643 } 9644 9645 QualType BaseType = ExDeclType; 9646 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9647 unsigned DK = diag::err_catch_incomplete; 9648 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9649 BaseType = Ptr->getPointeeType(); 9650 Mode = 1; 9651 DK = diag::err_catch_incomplete_ptr; 9652 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9653 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9654 BaseType = Ref->getPointeeType(); 9655 Mode = 2; 9656 DK = diag::err_catch_incomplete_ref; 9657 } 9658 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9659 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9660 Invalid = true; 9661 9662 if (!Invalid && !ExDeclType->isDependentType() && 9663 RequireNonAbstractType(Loc, ExDeclType, 9664 diag::err_abstract_type_in_decl, 9665 AbstractVariableType)) 9666 Invalid = true; 9667 9668 // Only the non-fragile NeXT runtime currently supports C++ catches 9669 // of ObjC types, and no runtime supports catching ObjC types by value. 9670 if (!Invalid && getLangOpts().ObjC1) { 9671 QualType T = ExDeclType; 9672 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9673 T = RT->getPointeeType(); 9674 9675 if (T->isObjCObjectType()) { 9676 Diag(Loc, diag::err_objc_object_catch); 9677 Invalid = true; 9678 } else if (T->isObjCObjectPointerType()) { 9679 // FIXME: should this be a test for macosx-fragile specifically? 9680 if (getLangOpts().ObjCRuntime.isFragile()) 9681 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9682 } 9683 } 9684 9685 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9686 ExDeclType, TInfo, SC_None, SC_None); 9687 ExDecl->setExceptionVariable(true); 9688 9689 // In ARC, infer 'retaining' for variables of retainable type. 9690 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9691 Invalid = true; 9692 9693 if (!Invalid && !ExDeclType->isDependentType()) { 9694 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9695 // C++ [except.handle]p16: 9696 // The object declared in an exception-declaration or, if the 9697 // exception-declaration does not specify a name, a temporary (12.2) is 9698 // copy-initialized (8.5) from the exception object. [...] 9699 // The object is destroyed when the handler exits, after the destruction 9700 // of any automatic objects initialized within the handler. 9701 // 9702 // We just pretend to initialize the object with itself, then make sure 9703 // it can be destroyed later. 9704 QualType initType = ExDeclType; 9705 9706 InitializedEntity entity = 9707 InitializedEntity::InitializeVariable(ExDecl); 9708 InitializationKind initKind = 9709 InitializationKind::CreateCopy(Loc, SourceLocation()); 9710 9711 Expr *opaqueValue = 9712 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9713 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9714 ExprResult result = sequence.Perform(*this, entity, initKind, 9715 MultiExprArg(&opaqueValue, 1)); 9716 if (result.isInvalid()) 9717 Invalid = true; 9718 else { 9719 // If the constructor used was non-trivial, set this as the 9720 // "initializer". 9721 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9722 if (!construct->getConstructor()->isTrivial()) { 9723 Expr *init = MaybeCreateExprWithCleanups(construct); 9724 ExDecl->setInit(init); 9725 } 9726 9727 // And make sure it's destructable. 9728 FinalizeVarWithDestructor(ExDecl, recordType); 9729 } 9730 } 9731 } 9732 9733 if (Invalid) 9734 ExDecl->setInvalidDecl(); 9735 9736 return ExDecl; 9737 } 9738 9739 /// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9740 /// handler. 9741 Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9742 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9743 bool Invalid = D.isInvalidType(); 9744 9745 // Check for unexpanded parameter packs. 9746 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9747 UPPC_ExceptionType)) { 9748 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9749 D.getIdentifierLoc()); 9750 Invalid = true; 9751 } 9752 9753 IdentifierInfo *II = D.getIdentifier(); 9754 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9755 LookupOrdinaryName, 9756 ForRedeclaration)) { 9757 // The scope should be freshly made just for us. There is just no way 9758 // it contains any previous declaration. 9759 assert(!S->isDeclScope(PrevDecl)); 9760 if (PrevDecl->isTemplateParameter()) { 9761 // Maybe we will complain about the shadowed template parameter. 9762 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9763 PrevDecl = 0; 9764 } 9765 } 9766 9767 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9768 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9769 << D.getCXXScopeSpec().getRange(); 9770 Invalid = true; 9771 } 9772 9773 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9774 D.getLocStart(), 9775 D.getIdentifierLoc(), 9776 D.getIdentifier()); 9777 if (Invalid) 9778 ExDecl->setInvalidDecl(); 9779 9780 // Add the exception declaration into this scope. 9781 if (II) 9782 PushOnScopeChains(ExDecl, S); 9783 else 9784 CurContext->addDecl(ExDecl); 9785 9786 ProcessDeclAttributes(S, ExDecl, D); 9787 return ExDecl; 9788 } 9789 9790 Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9791 Expr *AssertExpr, 9792 Expr *AssertMessageExpr, 9793 SourceLocation RParenLoc) { 9794 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 9795 9796 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9797 return 0; 9798 9799 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 9800 AssertMessage, RParenLoc, false); 9801 } 9802 9803 Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9804 Expr *AssertExpr, 9805 StringLiteral *AssertMessage, 9806 SourceLocation RParenLoc, 9807 bool Failed) { 9808 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 9809 !Failed) { 9810 // In a static_assert-declaration, the constant-expression shall be a 9811 // constant expression that can be contextually converted to bool. 9812 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9813 if (Converted.isInvalid()) 9814 Failed = true; 9815 9816 llvm::APSInt Cond; 9817 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 9818 diag::err_static_assert_expression_is_not_constant, 9819 /*AllowFold=*/false).isInvalid()) 9820 Failed = true; 9821 9822 if (!Failed && !Cond) { 9823 llvm::SmallString<256> MsgBuffer; 9824 llvm::raw_svector_ostream Msg(MsgBuffer); 9825 AssertMessage->printPretty(Msg, 0, getPrintingPolicy()); 9826 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9827 << Msg.str() << AssertExpr->getSourceRange(); 9828 Failed = true; 9829 } 9830 } 9831 9832 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9833 AssertExpr, AssertMessage, RParenLoc, 9834 Failed); 9835 9836 CurContext->addDecl(Decl); 9837 return Decl; 9838 } 9839 9840 /// \brief Perform semantic analysis of the given friend type declaration. 9841 /// 9842 /// \returns A friend declaration that. 9843 FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9844 SourceLocation FriendLoc, 9845 TypeSourceInfo *TSInfo) { 9846 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9847 9848 QualType T = TSInfo->getType(); 9849 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9850 9851 // C++03 [class.friend]p2: 9852 // An elaborated-type-specifier shall be used in a friend declaration 9853 // for a class.* 9854 // 9855 // * The class-key of the elaborated-type-specifier is required. 9856 if (!ActiveTemplateInstantiations.empty()) { 9857 // Do not complain about the form of friend template types during 9858 // template instantiation; we will already have complained when the 9859 // template was declared. 9860 } else if (!T->isElaboratedTypeSpecifier()) { 9861 // If we evaluated the type to a record type, suggest putting 9862 // a tag in front. 9863 if (const RecordType *RT = T->getAs<RecordType>()) { 9864 RecordDecl *RD = RT->getDecl(); 9865 9866 std::string InsertionText = std::string(" ") + RD->getKindName(); 9867 9868 Diag(TypeRange.getBegin(), 9869 getLangOpts().CPlusPlus0x ? 9870 diag::warn_cxx98_compat_unelaborated_friend_type : 9871 diag::ext_unelaborated_friend_type) 9872 << (unsigned) RD->getTagKind() 9873 << T 9874 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9875 InsertionText); 9876 } else { 9877 Diag(FriendLoc, 9878 getLangOpts().CPlusPlus0x ? 9879 diag::warn_cxx98_compat_nonclass_type_friend : 9880 diag::ext_nonclass_type_friend) 9881 << T 9882 << SourceRange(FriendLoc, TypeRange.getEnd()); 9883 } 9884 } else if (T->getAs<EnumType>()) { 9885 Diag(FriendLoc, 9886 getLangOpts().CPlusPlus0x ? 9887 diag::warn_cxx98_compat_enum_friend : 9888 diag::ext_enum_friend) 9889 << T 9890 << SourceRange(FriendLoc, TypeRange.getEnd()); 9891 } 9892 9893 // C++0x [class.friend]p3: 9894 // If the type specifier in a friend declaration designates a (possibly 9895 // cv-qualified) class type, that class is declared as a friend; otherwise, 9896 // the friend declaration is ignored. 9897 9898 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9899 // in [class.friend]p3 that we do not implement. 9900 9901 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9902 } 9903 9904 /// Handle a friend tag declaration where the scope specifier was 9905 /// templated. 9906 Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9907 unsigned TagSpec, SourceLocation TagLoc, 9908 CXXScopeSpec &SS, 9909 IdentifierInfo *Name, SourceLocation NameLoc, 9910 AttributeList *Attr, 9911 MultiTemplateParamsArg TempParamLists) { 9912 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9913 9914 bool isExplicitSpecialization = false; 9915 bool Invalid = false; 9916 9917 if (TemplateParameterList *TemplateParams 9918 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9919 TempParamLists.data(), 9920 TempParamLists.size(), 9921 /*friend*/ true, 9922 isExplicitSpecialization, 9923 Invalid)) { 9924 if (TemplateParams->size() > 0) { 9925 // This is a declaration of a class template. 9926 if (Invalid) 9927 return 0; 9928 9929 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9930 SS, Name, NameLoc, Attr, 9931 TemplateParams, AS_public, 9932 /*ModulePrivateLoc=*/SourceLocation(), 9933 TempParamLists.size() - 1, 9934 TempParamLists.data()).take(); 9935 } else { 9936 // The "template<>" header is extraneous. 9937 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9938 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9939 isExplicitSpecialization = true; 9940 } 9941 } 9942 9943 if (Invalid) return 0; 9944 9945 bool isAllExplicitSpecializations = true; 9946 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9947 if (TempParamLists[I]->size()) { 9948 isAllExplicitSpecializations = false; 9949 break; 9950 } 9951 } 9952 9953 // FIXME: don't ignore attributes. 9954 9955 // If it's explicit specializations all the way down, just forget 9956 // about the template header and build an appropriate non-templated 9957 // friend. TODO: for source fidelity, remember the headers. 9958 if (isAllExplicitSpecializations) { 9959 if (SS.isEmpty()) { 9960 bool Owned = false; 9961 bool IsDependent = false; 9962 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9963 Attr, AS_public, 9964 /*ModulePrivateLoc=*/SourceLocation(), 9965 MultiTemplateParamsArg(), Owned, IsDependent, 9966 /*ScopedEnumKWLoc=*/SourceLocation(), 9967 /*ScopedEnumUsesClassTag=*/false, 9968 /*UnderlyingType=*/TypeResult()); 9969 } 9970 9971 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9972 ElaboratedTypeKeyword Keyword 9973 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9974 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9975 *Name, NameLoc); 9976 if (T.isNull()) 9977 return 0; 9978 9979 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9980 if (isa<DependentNameType>(T)) { 9981 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9982 TL.setElaboratedKeywordLoc(TagLoc); 9983 TL.setQualifierLoc(QualifierLoc); 9984 TL.setNameLoc(NameLoc); 9985 } else { 9986 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9987 TL.setElaboratedKeywordLoc(TagLoc); 9988 TL.setQualifierLoc(QualifierLoc); 9989 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9990 } 9991 9992 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9993 TSI, FriendLoc); 9994 Friend->setAccess(AS_public); 9995 CurContext->addDecl(Friend); 9996 return Friend; 9997 } 9998 9999 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 10000 10001 10002 10003 // Handle the case of a templated-scope friend class. e.g. 10004 // template <class T> class A<T>::B; 10005 // FIXME: we don't support these right now. 10006 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10007 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10008 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10009 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10010 TL.setElaboratedKeywordLoc(TagLoc); 10011 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10012 TL.setNameLoc(NameLoc); 10013 10014 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10015 TSI, FriendLoc); 10016 Friend->setAccess(AS_public); 10017 Friend->setUnsupportedFriend(true); 10018 CurContext->addDecl(Friend); 10019 return Friend; 10020 } 10021 10022 10023 /// Handle a friend type declaration. This works in tandem with 10024 /// ActOnTag. 10025 /// 10026 /// Notes on friend class templates: 10027 /// 10028 /// We generally treat friend class declarations as if they were 10029 /// declaring a class. So, for example, the elaborated type specifier 10030 /// in a friend declaration is required to obey the restrictions of a 10031 /// class-head (i.e. no typedefs in the scope chain), template 10032 /// parameters are required to match up with simple template-ids, &c. 10033 /// However, unlike when declaring a template specialization, it's 10034 /// okay to refer to a template specialization without an empty 10035 /// template parameter declaration, e.g. 10036 /// friend class A<T>::B<unsigned>; 10037 /// We permit this as a special case; if there are any template 10038 /// parameters present at all, require proper matching, i.e. 10039 /// template <> template \<class T> friend class A<int>::B; 10040 Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10041 MultiTemplateParamsArg TempParams) { 10042 SourceLocation Loc = DS.getLocStart(); 10043 10044 assert(DS.isFriendSpecified()); 10045 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10046 10047 // Try to convert the decl specifier to a type. This works for 10048 // friend templates because ActOnTag never produces a ClassTemplateDecl 10049 // for a TUK_Friend. 10050 Declarator TheDeclarator(DS, Declarator::MemberContext); 10051 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10052 QualType T = TSI->getType(); 10053 if (TheDeclarator.isInvalidType()) 10054 return 0; 10055 10056 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10057 return 0; 10058 10059 // This is definitely an error in C++98. It's probably meant to 10060 // be forbidden in C++0x, too, but the specification is just 10061 // poorly written. 10062 // 10063 // The problem is with declarations like the following: 10064 // template <T> friend A<T>::foo; 10065 // where deciding whether a class C is a friend or not now hinges 10066 // on whether there exists an instantiation of A that causes 10067 // 'foo' to equal C. There are restrictions on class-heads 10068 // (which we declare (by fiat) elaborated friend declarations to 10069 // be) that makes this tractable. 10070 // 10071 // FIXME: handle "template <> friend class A<T>;", which 10072 // is possibly well-formed? Who even knows? 10073 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10074 Diag(Loc, diag::err_tagless_friend_type_template) 10075 << DS.getSourceRange(); 10076 return 0; 10077 } 10078 10079 // C++98 [class.friend]p1: A friend of a class is a function 10080 // or class that is not a member of the class . . . 10081 // This is fixed in DR77, which just barely didn't make the C++03 10082 // deadline. It's also a very silly restriction that seriously 10083 // affects inner classes and which nobody else seems to implement; 10084 // thus we never diagnose it, not even in -pedantic. 10085 // 10086 // But note that we could warn about it: it's always useless to 10087 // friend one of your own members (it's not, however, worthless to 10088 // friend a member of an arbitrary specialization of your template). 10089 10090 Decl *D; 10091 if (unsigned NumTempParamLists = TempParams.size()) 10092 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10093 NumTempParamLists, 10094 TempParams.data(), 10095 TSI, 10096 DS.getFriendSpecLoc()); 10097 else 10098 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10099 10100 if (!D) 10101 return 0; 10102 10103 D->setAccess(AS_public); 10104 CurContext->addDecl(D); 10105 10106 return D; 10107 } 10108 10109 Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10110 MultiTemplateParamsArg TemplateParams) { 10111 const DeclSpec &DS = D.getDeclSpec(); 10112 10113 assert(DS.isFriendSpecified()); 10114 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10115 10116 SourceLocation Loc = D.getIdentifierLoc(); 10117 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10118 10119 // C++ [class.friend]p1 10120 // A friend of a class is a function or class.... 10121 // Note that this sees through typedefs, which is intended. 10122 // It *doesn't* see through dependent types, which is correct 10123 // according to [temp.arg.type]p3: 10124 // If a declaration acquires a function type through a 10125 // type dependent on a template-parameter and this causes 10126 // a declaration that does not use the syntactic form of a 10127 // function declarator to have a function type, the program 10128 // is ill-formed. 10129 if (!TInfo->getType()->isFunctionType()) { 10130 Diag(Loc, diag::err_unexpected_friend); 10131 10132 // It might be worthwhile to try to recover by creating an 10133 // appropriate declaration. 10134 return 0; 10135 } 10136 10137 // C++ [namespace.memdef]p3 10138 // - If a friend declaration in a non-local class first declares a 10139 // class or function, the friend class or function is a member 10140 // of the innermost enclosing namespace. 10141 // - The name of the friend is not found by simple name lookup 10142 // until a matching declaration is provided in that namespace 10143 // scope (either before or after the class declaration granting 10144 // friendship). 10145 // - If a friend function is called, its name may be found by the 10146 // name lookup that considers functions from namespaces and 10147 // classes associated with the types of the function arguments. 10148 // - When looking for a prior declaration of a class or a function 10149 // declared as a friend, scopes outside the innermost enclosing 10150 // namespace scope are not considered. 10151 10152 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10153 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10154 DeclarationName Name = NameInfo.getName(); 10155 assert(Name); 10156 10157 // Check for unexpanded parameter packs. 10158 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10159 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10160 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10161 return 0; 10162 10163 // The context we found the declaration in, or in which we should 10164 // create the declaration. 10165 DeclContext *DC; 10166 Scope *DCScope = S; 10167 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10168 ForRedeclaration); 10169 10170 // FIXME: there are different rules in local classes 10171 10172 // There are four cases here. 10173 // - There's no scope specifier, in which case we just go to the 10174 // appropriate scope and look for a function or function template 10175 // there as appropriate. 10176 // Recover from invalid scope qualifiers as if they just weren't there. 10177 if (SS.isInvalid() || !SS.isSet()) { 10178 // C++0x [namespace.memdef]p3: 10179 // If the name in a friend declaration is neither qualified nor 10180 // a template-id and the declaration is a function or an 10181 // elaborated-type-specifier, the lookup to determine whether 10182 // the entity has been previously declared shall not consider 10183 // any scopes outside the innermost enclosing namespace. 10184 // C++0x [class.friend]p11: 10185 // If a friend declaration appears in a local class and the name 10186 // specified is an unqualified name, a prior declaration is 10187 // looked up without considering scopes that are outside the 10188 // innermost enclosing non-class scope. For a friend function 10189 // declaration, if there is no prior declaration, the program is 10190 // ill-formed. 10191 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10192 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10193 10194 // Find the appropriate context according to the above. 10195 DC = CurContext; 10196 while (true) { 10197 // Skip class contexts. If someone can cite chapter and verse 10198 // for this behavior, that would be nice --- it's what GCC and 10199 // EDG do, and it seems like a reasonable intent, but the spec 10200 // really only says that checks for unqualified existing 10201 // declarations should stop at the nearest enclosing namespace, 10202 // not that they should only consider the nearest enclosing 10203 // namespace. 10204 while (DC->isRecord() || DC->isTransparentContext()) 10205 DC = DC->getParent(); 10206 10207 LookupQualifiedName(Previous, DC); 10208 10209 // TODO: decide what we think about using declarations. 10210 if (isLocal || !Previous.empty()) 10211 break; 10212 10213 if (isTemplateId) { 10214 if (isa<TranslationUnitDecl>(DC)) break; 10215 } else { 10216 if (DC->isFileContext()) break; 10217 } 10218 DC = DC->getParent(); 10219 } 10220 10221 // C++ [class.friend]p1: A friend of a class is a function or 10222 // class that is not a member of the class . . . 10223 // C++11 changes this for both friend types and functions. 10224 // Most C++ 98 compilers do seem to give an error here, so 10225 // we do, too. 10226 if (!Previous.empty() && DC->Equals(CurContext)) 10227 Diag(DS.getFriendSpecLoc(), 10228 getLangOpts().CPlusPlus0x ? 10229 diag::warn_cxx98_compat_friend_is_member : 10230 diag::err_friend_is_member); 10231 10232 DCScope = getScopeForDeclContext(S, DC); 10233 10234 // C++ [class.friend]p6: 10235 // A function can be defined in a friend declaration of a class if and 10236 // only if the class is a non-local class (9.8), the function name is 10237 // unqualified, and the function has namespace scope. 10238 if (isLocal && D.isFunctionDefinition()) { 10239 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10240 } 10241 10242 // - There's a non-dependent scope specifier, in which case we 10243 // compute it and do a previous lookup there for a function 10244 // or function template. 10245 } else if (!SS.getScopeRep()->isDependent()) { 10246 DC = computeDeclContext(SS); 10247 if (!DC) return 0; 10248 10249 if (RequireCompleteDeclContext(SS, DC)) return 0; 10250 10251 LookupQualifiedName(Previous, DC); 10252 10253 // Ignore things found implicitly in the wrong scope. 10254 // TODO: better diagnostics for this case. Suggesting the right 10255 // qualified scope would be nice... 10256 LookupResult::Filter F = Previous.makeFilter(); 10257 while (F.hasNext()) { 10258 NamedDecl *D = F.next(); 10259 if (!DC->InEnclosingNamespaceSetOf( 10260 D->getDeclContext()->getRedeclContext())) 10261 F.erase(); 10262 } 10263 F.done(); 10264 10265 if (Previous.empty()) { 10266 D.setInvalidType(); 10267 Diag(Loc, diag::err_qualified_friend_not_found) 10268 << Name << TInfo->getType(); 10269 return 0; 10270 } 10271 10272 // C++ [class.friend]p1: A friend of a class is a function or 10273 // class that is not a member of the class . . . 10274 if (DC->Equals(CurContext)) 10275 Diag(DS.getFriendSpecLoc(), 10276 getLangOpts().CPlusPlus0x ? 10277 diag::warn_cxx98_compat_friend_is_member : 10278 diag::err_friend_is_member); 10279 10280 if (D.isFunctionDefinition()) { 10281 // C++ [class.friend]p6: 10282 // A function can be defined in a friend declaration of a class if and 10283 // only if the class is a non-local class (9.8), the function name is 10284 // unqualified, and the function has namespace scope. 10285 SemaDiagnosticBuilder DB 10286 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10287 10288 DB << SS.getScopeRep(); 10289 if (DC->isFileContext()) 10290 DB << FixItHint::CreateRemoval(SS.getRange()); 10291 SS.clear(); 10292 } 10293 10294 // - There's a scope specifier that does not match any template 10295 // parameter lists, in which case we use some arbitrary context, 10296 // create a method or method template, and wait for instantiation. 10297 // - There's a scope specifier that does match some template 10298 // parameter lists, which we don't handle right now. 10299 } else { 10300 if (D.isFunctionDefinition()) { 10301 // C++ [class.friend]p6: 10302 // A function can be defined in a friend declaration of a class if and 10303 // only if the class is a non-local class (9.8), the function name is 10304 // unqualified, and the function has namespace scope. 10305 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10306 << SS.getScopeRep(); 10307 } 10308 10309 DC = CurContext; 10310 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10311 } 10312 10313 if (!DC->isRecord()) { 10314 // This implies that it has to be an operator or function. 10315 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10316 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10317 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10318 Diag(Loc, diag::err_introducing_special_friend) << 10319 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10320 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10321 return 0; 10322 } 10323 } 10324 10325 // FIXME: This is an egregious hack to cope with cases where the scope stack 10326 // does not contain the declaration context, i.e., in an out-of-line 10327 // definition of a class. 10328 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10329 if (!DCScope) { 10330 FakeDCScope.setEntity(DC); 10331 DCScope = &FakeDCScope; 10332 } 10333 10334 bool AddToScope = true; 10335 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10336 TemplateParams, AddToScope); 10337 if (!ND) return 0; 10338 10339 assert(ND->getDeclContext() == DC); 10340 assert(ND->getLexicalDeclContext() == CurContext); 10341 10342 // Add the function declaration to the appropriate lookup tables, 10343 // adjusting the redeclarations list as necessary. We don't 10344 // want to do this yet if the friending class is dependent. 10345 // 10346 // Also update the scope-based lookup if the target context's 10347 // lookup context is in lexical scope. 10348 if (!CurContext->isDependentContext()) { 10349 DC = DC->getRedeclContext(); 10350 DC->makeDeclVisibleInContext(ND); 10351 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10352 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10353 } 10354 10355 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10356 D.getIdentifierLoc(), ND, 10357 DS.getFriendSpecLoc()); 10358 FrD->setAccess(AS_public); 10359 CurContext->addDecl(FrD); 10360 10361 if (ND->isInvalidDecl()) { 10362 FrD->setInvalidDecl(); 10363 } else { 10364 if (DC->isRecord()) CheckFriendAccess(ND); 10365 10366 FunctionDecl *FD; 10367 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10368 FD = FTD->getTemplatedDecl(); 10369 else 10370 FD = cast<FunctionDecl>(ND); 10371 10372 // Mark templated-scope function declarations as unsupported. 10373 if (FD->getNumTemplateParameterLists()) 10374 FrD->setUnsupportedFriend(true); 10375 } 10376 10377 return ND; 10378 } 10379 10380 void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10381 AdjustDeclIfTemplate(Dcl); 10382 10383 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10384 if (!Fn) { 10385 Diag(DelLoc, diag::err_deleted_non_function); 10386 return; 10387 } 10388 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10389 // Don't consider the implicit declaration we generate for explicit 10390 // specializations. FIXME: Do not generate these implicit declarations. 10391 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 10392 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 10393 Diag(DelLoc, diag::err_deleted_decl_not_first); 10394 Diag(Prev->getLocation(), diag::note_previous_declaration); 10395 } 10396 // If the declaration wasn't the first, we delete the function anyway for 10397 // recovery. 10398 } 10399 Fn->setDeletedAsWritten(); 10400 10401 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10402 if (!MD) 10403 return; 10404 10405 // A deleted special member function is trivial if the corresponding 10406 // implicitly-declared function would have been. 10407 switch (getSpecialMember(MD)) { 10408 case CXXInvalid: 10409 break; 10410 case CXXDefaultConstructor: 10411 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor()); 10412 break; 10413 case CXXCopyConstructor: 10414 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor()); 10415 break; 10416 case CXXMoveConstructor: 10417 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor()); 10418 break; 10419 case CXXCopyAssignment: 10420 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 10421 break; 10422 case CXXMoveAssignment: 10423 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 10424 break; 10425 case CXXDestructor: 10426 MD->setTrivial(MD->getParent()->hasTrivialDestructor()); 10427 break; 10428 } 10429 } 10430 10431 void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10432 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10433 10434 if (MD) { 10435 if (MD->getParent()->isDependentType()) { 10436 MD->setDefaulted(); 10437 MD->setExplicitlyDefaulted(); 10438 return; 10439 } 10440 10441 CXXSpecialMember Member = getSpecialMember(MD); 10442 if (Member == CXXInvalid) { 10443 Diag(DefaultLoc, diag::err_default_special_members); 10444 return; 10445 } 10446 10447 MD->setDefaulted(); 10448 MD->setExplicitlyDefaulted(); 10449 10450 // If this definition appears within the record, do the checking when 10451 // the record is complete. 10452 const FunctionDecl *Primary = MD; 10453 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern()) 10454 // Find the uninstantiated declaration that actually had the '= default' 10455 // on it. 10456 Pattern->isDefined(Primary); 10457 10458 if (Primary == Primary->getCanonicalDecl()) 10459 return; 10460 10461 CheckExplicitlyDefaultedSpecialMember(MD); 10462 10463 switch (Member) { 10464 case CXXDefaultConstructor: { 10465 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10466 if (!CD->isInvalidDecl()) 10467 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10468 break; 10469 } 10470 10471 case CXXCopyConstructor: { 10472 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10473 if (!CD->isInvalidDecl()) 10474 DefineImplicitCopyConstructor(DefaultLoc, CD); 10475 break; 10476 } 10477 10478 case CXXCopyAssignment: { 10479 if (!MD->isInvalidDecl()) 10480 DefineImplicitCopyAssignment(DefaultLoc, MD); 10481 break; 10482 } 10483 10484 case CXXDestructor: { 10485 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10486 if (!DD->isInvalidDecl()) 10487 DefineImplicitDestructor(DefaultLoc, DD); 10488 break; 10489 } 10490 10491 case CXXMoveConstructor: { 10492 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10493 if (!CD->isInvalidDecl()) 10494 DefineImplicitMoveConstructor(DefaultLoc, CD); 10495 break; 10496 } 10497 10498 case CXXMoveAssignment: { 10499 if (!MD->isInvalidDecl()) 10500 DefineImplicitMoveAssignment(DefaultLoc, MD); 10501 break; 10502 } 10503 10504 case CXXInvalid: 10505 llvm_unreachable("Invalid special member."); 10506 } 10507 } else { 10508 Diag(DefaultLoc, diag::err_default_special_members); 10509 } 10510 } 10511 10512 static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10513 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10514 Stmt *SubStmt = *CI; 10515 if (!SubStmt) 10516 continue; 10517 if (isa<ReturnStmt>(SubStmt)) 10518 Self.Diag(SubStmt->getLocStart(), 10519 diag::err_return_in_constructor_handler); 10520 if (!isa<Expr>(SubStmt)) 10521 SearchForReturnInStmt(Self, SubStmt); 10522 } 10523 } 10524 10525 void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10526 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10527 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10528 SearchForReturnInStmt(*this, Handler); 10529 } 10530 } 10531 10532 bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10533 const CXXMethodDecl *Old) { 10534 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10535 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10536 10537 if (Context.hasSameType(NewTy, OldTy) || 10538 NewTy->isDependentType() || OldTy->isDependentType()) 10539 return false; 10540 10541 // Check if the return types are covariant 10542 QualType NewClassTy, OldClassTy; 10543 10544 /// Both types must be pointers or references to classes. 10545 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10546 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10547 NewClassTy = NewPT->getPointeeType(); 10548 OldClassTy = OldPT->getPointeeType(); 10549 } 10550 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10551 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10552 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10553 NewClassTy = NewRT->getPointeeType(); 10554 OldClassTy = OldRT->getPointeeType(); 10555 } 10556 } 10557 } 10558 10559 // The return types aren't either both pointers or references to a class type. 10560 if (NewClassTy.isNull()) { 10561 Diag(New->getLocation(), 10562 diag::err_different_return_type_for_overriding_virtual_function) 10563 << New->getDeclName() << NewTy << OldTy; 10564 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10565 10566 return true; 10567 } 10568 10569 // C++ [class.virtual]p6: 10570 // If the return type of D::f differs from the return type of B::f, the 10571 // class type in the return type of D::f shall be complete at the point of 10572 // declaration of D::f or shall be the class type D. 10573 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10574 if (!RT->isBeingDefined() && 10575 RequireCompleteType(New->getLocation(), NewClassTy, 10576 diag::err_covariant_return_incomplete, 10577 New->getDeclName())) 10578 return true; 10579 } 10580 10581 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10582 // Check if the new class derives from the old class. 10583 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10584 Diag(New->getLocation(), 10585 diag::err_covariant_return_not_derived) 10586 << New->getDeclName() << NewTy << OldTy; 10587 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10588 return true; 10589 } 10590 10591 // Check if we the conversion from derived to base is valid. 10592 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10593 diag::err_covariant_return_inaccessible_base, 10594 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10595 // FIXME: Should this point to the return type? 10596 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10597 // FIXME: this note won't trigger for delayed access control 10598 // diagnostics, and it's impossible to get an undelayed error 10599 // here from access control during the original parse because 10600 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10601 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10602 return true; 10603 } 10604 } 10605 10606 // The qualifiers of the return types must be the same. 10607 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10608 Diag(New->getLocation(), 10609 diag::err_covariant_return_type_different_qualifications) 10610 << New->getDeclName() << NewTy << OldTy; 10611 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10612 return true; 10613 }; 10614 10615 10616 // The new class type must have the same or less qualifiers as the old type. 10617 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10618 Diag(New->getLocation(), 10619 diag::err_covariant_return_type_class_type_more_qualified) 10620 << New->getDeclName() << NewTy << OldTy; 10621 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10622 return true; 10623 }; 10624 10625 return false; 10626 } 10627 10628 /// \brief Mark the given method pure. 10629 /// 10630 /// \param Method the method to be marked pure. 10631 /// 10632 /// \param InitRange the source range that covers the "0" initializer. 10633 bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10634 SourceLocation EndLoc = InitRange.getEnd(); 10635 if (EndLoc.isValid()) 10636 Method->setRangeEnd(EndLoc); 10637 10638 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10639 Method->setPure(); 10640 return false; 10641 } 10642 10643 if (!Method->isInvalidDecl()) 10644 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10645 << Method->getDeclName() << InitRange; 10646 return true; 10647 } 10648 10649 /// \brief Determine whether the given declaration is a static data member. 10650 static bool isStaticDataMember(Decl *D) { 10651 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10652 if (!Var) 10653 return false; 10654 10655 return Var->isStaticDataMember(); 10656 } 10657 /// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10658 /// an initializer for the out-of-line declaration 'Dcl'. The scope 10659 /// is a fresh scope pushed for just this purpose. 10660 /// 10661 /// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10662 /// static data member of class X, names should be looked up in the scope of 10663 /// class X. 10664 void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10665 // If there is no declaration, there was an error parsing it. 10666 if (D == 0 || D->isInvalidDecl()) return; 10667 10668 // We should only get called for declarations with scope specifiers, like: 10669 // int foo::bar; 10670 assert(D->isOutOfLine()); 10671 EnterDeclaratorContext(S, D->getDeclContext()); 10672 10673 // If we are parsing the initializer for a static data member, push a 10674 // new expression evaluation context that is associated with this static 10675 // data member. 10676 if (isStaticDataMember(D)) 10677 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10678 } 10679 10680 /// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10681 /// initializer for the out-of-line declaration 'D'. 10682 void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10683 // If there is no declaration, there was an error parsing it. 10684 if (D == 0 || D->isInvalidDecl()) return; 10685 10686 if (isStaticDataMember(D)) 10687 PopExpressionEvaluationContext(); 10688 10689 assert(D->isOutOfLine()); 10690 ExitDeclaratorContext(S); 10691 } 10692 10693 /// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10694 /// C++ if/switch/while/for statement. 10695 /// e.g: "if (int x = f()) {...}" 10696 DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10697 // C++ 6.4p2: 10698 // The declarator shall not specify a function or an array. 10699 // The type-specifier-seq shall not contain typedef and shall not declare a 10700 // new class or enumeration. 10701 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10702 "Parser allowed 'typedef' as storage class of condition decl."); 10703 10704 Decl *Dcl = ActOnDeclarator(S, D); 10705 if (!Dcl) 10706 return true; 10707 10708 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10709 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10710 << D.getSourceRange(); 10711 return true; 10712 } 10713 10714 return Dcl; 10715 } 10716 10717 void Sema::LoadExternalVTableUses() { 10718 if (!ExternalSource) 10719 return; 10720 10721 SmallVector<ExternalVTableUse, 4> VTables; 10722 ExternalSource->ReadUsedVTables(VTables); 10723 SmallVector<VTableUse, 4> NewUses; 10724 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10725 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10726 = VTablesUsed.find(VTables[I].Record); 10727 // Even if a definition wasn't required before, it may be required now. 10728 if (Pos != VTablesUsed.end()) { 10729 if (!Pos->second && VTables[I].DefinitionRequired) 10730 Pos->second = true; 10731 continue; 10732 } 10733 10734 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10735 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10736 } 10737 10738 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10739 } 10740 10741 void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10742 bool DefinitionRequired) { 10743 // Ignore any vtable uses in unevaluated operands or for classes that do 10744 // not have a vtable. 10745 if (!Class->isDynamicClass() || Class->isDependentContext() || 10746 CurContext->isDependentContext() || 10747 ExprEvalContexts.back().Context == Unevaluated) 10748 return; 10749 10750 // Try to insert this class into the map. 10751 LoadExternalVTableUses(); 10752 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10753 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10754 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10755 if (!Pos.second) { 10756 // If we already had an entry, check to see if we are promoting this vtable 10757 // to required a definition. If so, we need to reappend to the VTableUses 10758 // list, since we may have already processed the first entry. 10759 if (DefinitionRequired && !Pos.first->second) { 10760 Pos.first->second = true; 10761 } else { 10762 // Otherwise, we can early exit. 10763 return; 10764 } 10765 } 10766 10767 // Local classes need to have their virtual members marked 10768 // immediately. For all other classes, we mark their virtual members 10769 // at the end of the translation unit. 10770 if (Class->isLocalClass()) 10771 MarkVirtualMembersReferenced(Loc, Class); 10772 else 10773 VTableUses.push_back(std::make_pair(Class, Loc)); 10774 } 10775 10776 bool Sema::DefineUsedVTables() { 10777 LoadExternalVTableUses(); 10778 if (VTableUses.empty()) 10779 return false; 10780 10781 // Note: The VTableUses vector could grow as a result of marking 10782 // the members of a class as "used", so we check the size each 10783 // time through the loop and prefer indices (which are stable) to 10784 // iterators (which are not). 10785 bool DefinedAnything = false; 10786 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10787 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10788 if (!Class) 10789 continue; 10790 10791 SourceLocation Loc = VTableUses[I].second; 10792 10793 bool DefineVTable = true; 10794 10795 // If this class has a key function, but that key function is 10796 // defined in another translation unit, we don't need to emit the 10797 // vtable even though we're using it. 10798 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10799 if (KeyFunction && !KeyFunction->hasBody()) { 10800 switch (KeyFunction->getTemplateSpecializationKind()) { 10801 case TSK_Undeclared: 10802 case TSK_ExplicitSpecialization: 10803 case TSK_ExplicitInstantiationDeclaration: 10804 // The key function is in another translation unit. 10805 DefineVTable = false; 10806 break; 10807 10808 case TSK_ExplicitInstantiationDefinition: 10809 case TSK_ImplicitInstantiation: 10810 // We will be instantiating the key function. 10811 break; 10812 } 10813 } else if (!KeyFunction) { 10814 // If we have a class with no key function that is the subject 10815 // of an explicit instantiation declaration, suppress the 10816 // vtable; it will live with the explicit instantiation 10817 // definition. 10818 bool IsExplicitInstantiationDeclaration 10819 = Class->getTemplateSpecializationKind() 10820 == TSK_ExplicitInstantiationDeclaration; 10821 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10822 REnd = Class->redecls_end(); 10823 R != REnd; ++R) { 10824 TemplateSpecializationKind TSK 10825 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10826 if (TSK == TSK_ExplicitInstantiationDeclaration) 10827 IsExplicitInstantiationDeclaration = true; 10828 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10829 IsExplicitInstantiationDeclaration = false; 10830 break; 10831 } 10832 } 10833 10834 if (IsExplicitInstantiationDeclaration) 10835 DefineVTable = false; 10836 } 10837 10838 // The exception specifications for all virtual members may be needed even 10839 // if we are not providing an authoritative form of the vtable in this TU. 10840 // We may choose to emit it available_externally anyway. 10841 if (!DefineVTable) { 10842 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 10843 continue; 10844 } 10845 10846 // Mark all of the virtual members of this class as referenced, so 10847 // that we can build a vtable. Then, tell the AST consumer that a 10848 // vtable for this class is required. 10849 DefinedAnything = true; 10850 MarkVirtualMembersReferenced(Loc, Class); 10851 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10852 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10853 10854 // Optionally warn if we're emitting a weak vtable. 10855 if (Class->getLinkage() == ExternalLinkage && 10856 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10857 const FunctionDecl *KeyFunctionDef = 0; 10858 if (!KeyFunction || 10859 (KeyFunction->hasBody(KeyFunctionDef) && 10860 KeyFunctionDef->isInlined())) 10861 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10862 TSK_ExplicitInstantiationDefinition 10863 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10864 << Class; 10865 } 10866 } 10867 VTableUses.clear(); 10868 10869 return DefinedAnything; 10870 } 10871 10872 void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 10873 const CXXRecordDecl *RD) { 10874 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 10875 E = RD->method_end(); I != E; ++I) 10876 if ((*I)->isVirtual() && !(*I)->isPure()) 10877 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 10878 } 10879 10880 void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10881 const CXXRecordDecl *RD) { 10882 // Mark all functions which will appear in RD's vtable as used. 10883 CXXFinalOverriderMap FinalOverriders; 10884 RD->getFinalOverriders(FinalOverriders); 10885 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 10886 E = FinalOverriders.end(); 10887 I != E; ++I) { 10888 for (OverridingMethods::const_iterator OI = I->second.begin(), 10889 OE = I->second.end(); 10890 OI != OE; ++OI) { 10891 assert(OI->second.size() > 0 && "no final overrider"); 10892 CXXMethodDecl *Overrider = OI->second.front().Method; 10893 10894 // C++ [basic.def.odr]p2: 10895 // [...] A virtual member function is used if it is not pure. [...] 10896 if (!Overrider->isPure()) 10897 MarkFunctionReferenced(Loc, Overrider); 10898 } 10899 } 10900 10901 // Only classes that have virtual bases need a VTT. 10902 if (RD->getNumVBases() == 0) 10903 return; 10904 10905 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10906 e = RD->bases_end(); i != e; ++i) { 10907 const CXXRecordDecl *Base = 10908 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10909 if (Base->getNumVBases() == 0) 10910 continue; 10911 MarkVirtualMembersReferenced(Loc, Base); 10912 } 10913 } 10914 10915 /// SetIvarInitializers - This routine builds initialization ASTs for the 10916 /// Objective-C implementation whose ivars need be initialized. 10917 void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10918 if (!getLangOpts().CPlusPlus) 10919 return; 10920 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10921 SmallVector<ObjCIvarDecl*, 8> ivars; 10922 CollectIvarsToConstructOrDestruct(OID, ivars); 10923 if (ivars.empty()) 10924 return; 10925 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10926 for (unsigned i = 0; i < ivars.size(); i++) { 10927 FieldDecl *Field = ivars[i]; 10928 if (Field->isInvalidDecl()) 10929 continue; 10930 10931 CXXCtorInitializer *Member; 10932 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10933 InitializationKind InitKind = 10934 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10935 10936 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10937 ExprResult MemberInit = 10938 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10939 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10940 // Note, MemberInit could actually come back empty if no initialization 10941 // is required (e.g., because it would call a trivial default constructor) 10942 if (!MemberInit.get() || MemberInit.isInvalid()) 10943 continue; 10944 10945 Member = 10946 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10947 SourceLocation(), 10948 MemberInit.takeAs<Expr>(), 10949 SourceLocation()); 10950 AllToInit.push_back(Member); 10951 10952 // Be sure that the destructor is accessible and is marked as referenced. 10953 if (const RecordType *RecordTy 10954 = Context.getBaseElementType(Field->getType()) 10955 ->getAs<RecordType>()) { 10956 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10957 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10958 MarkFunctionReferenced(Field->getLocation(), Destructor); 10959 CheckDestructorAccess(Field->getLocation(), Destructor, 10960 PDiag(diag::err_access_dtor_ivar) 10961 << Context.getBaseElementType(Field->getType())); 10962 } 10963 } 10964 } 10965 ObjCImplementation->setIvarInitializers(Context, 10966 AllToInit.data(), AllToInit.size()); 10967 } 10968 } 10969 10970 static 10971 void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10972 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10973 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10974 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10975 Sema &S) { 10976 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10977 CE = Current.end(); 10978 if (Ctor->isInvalidDecl()) 10979 return; 10980 10981 CXXConstructorDecl *Target = Ctor->getTargetConstructor(); 10982 10983 // Target may not be determinable yet, for instance if this is a dependent 10984 // call in an uninstantiated template. 10985 if (Target) { 10986 const FunctionDecl *FNTarget = 0; 10987 (void)Target->hasBody(FNTarget); 10988 Target = const_cast<CXXConstructorDecl*>( 10989 cast_or_null<CXXConstructorDecl>(FNTarget)); 10990 } 10991 10992 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10993 // Avoid dereferencing a null pointer here. 10994 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10995 10996 if (!Current.insert(Canonical)) 10997 return; 10998 10999 // We know that beyond here, we aren't chaining into a cycle. 11000 if (!Target || !Target->isDelegatingConstructor() || 11001 Target->isInvalidDecl() || Valid.count(TCanonical)) { 11002 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11003 Valid.insert(*CI); 11004 Current.clear(); 11005 // We've hit a cycle. 11006 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 11007 Current.count(TCanonical)) { 11008 // If we haven't diagnosed this cycle yet, do so now. 11009 if (!Invalid.count(TCanonical)) { 11010 S.Diag((*Ctor->init_begin())->getSourceLocation(), 11011 diag::warn_delegating_ctor_cycle) 11012 << Ctor; 11013 11014 // Don't add a note for a function delegating directly to itself. 11015 if (TCanonical != Canonical) 11016 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11017 11018 CXXConstructorDecl *C = Target; 11019 while (C->getCanonicalDecl() != Canonical) { 11020 const FunctionDecl *FNTarget = 0; 11021 (void)C->getTargetConstructor()->hasBody(FNTarget); 11022 assert(FNTarget && "Ctor cycle through bodiless function"); 11023 11024 C = const_cast<CXXConstructorDecl*>( 11025 cast<CXXConstructorDecl>(FNTarget)); 11026 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11027 } 11028 } 11029 11030 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11031 Invalid.insert(*CI); 11032 Current.clear(); 11033 } else { 11034 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11035 } 11036 } 11037 11038 11039 void Sema::CheckDelegatingCtorCycles() { 11040 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11041 11042 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11043 CE = Current.end(); 11044 11045 for (DelegatingCtorDeclsType::iterator 11046 I = DelegatingCtorDecls.begin(ExternalSource), 11047 E = DelegatingCtorDecls.end(); 11048 I != E; ++I) 11049 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11050 11051 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11052 (*CI)->setInvalidDecl(); 11053 } 11054 11055 namespace { 11056 /// \brief AST visitor that finds references to the 'this' expression. 11057 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 11058 Sema &S; 11059 11060 public: 11061 explicit FindCXXThisExpr(Sema &S) : S(S) { } 11062 11063 bool VisitCXXThisExpr(CXXThisExpr *E) { 11064 S.Diag(E->getLocation(), diag::err_this_static_member_func) 11065 << E->isImplicit(); 11066 return false; 11067 } 11068 }; 11069 } 11070 11071 bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 11072 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11073 if (!TSInfo) 11074 return false; 11075 11076 TypeLoc TL = TSInfo->getTypeLoc(); 11077 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11078 if (!ProtoTL) 11079 return false; 11080 11081 // C++11 [expr.prim.general]p3: 11082 // [The expression this] shall not appear before the optional 11083 // cv-qualifier-seq and it shall not appear within the declaration of a 11084 // static member function (although its type and value category are defined 11085 // within a static member function as they are within a non-static member 11086 // function). [ Note: this is because declaration matching does not occur 11087 // until the complete declarator is known. - end note ] 11088 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11089 FindCXXThisExpr Finder(*this); 11090 11091 // If the return type came after the cv-qualifier-seq, check it now. 11092 if (Proto->hasTrailingReturn() && 11093 !Finder.TraverseTypeLoc(ProtoTL->getResultLoc())) 11094 return true; 11095 11096 // Check the exception specification. 11097 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 11098 return true; 11099 11100 return checkThisInStaticMemberFunctionAttributes(Method); 11101 } 11102 11103 bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 11104 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11105 if (!TSInfo) 11106 return false; 11107 11108 TypeLoc TL = TSInfo->getTypeLoc(); 11109 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11110 if (!ProtoTL) 11111 return false; 11112 11113 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11114 FindCXXThisExpr Finder(*this); 11115 11116 switch (Proto->getExceptionSpecType()) { 11117 case EST_Uninstantiated: 11118 case EST_Unevaluated: 11119 case EST_BasicNoexcept: 11120 case EST_DynamicNone: 11121 case EST_MSAny: 11122 case EST_None: 11123 break; 11124 11125 case EST_ComputedNoexcept: 11126 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11127 return true; 11128 11129 case EST_Dynamic: 11130 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11131 EEnd = Proto->exception_end(); 11132 E != EEnd; ++E) { 11133 if (!Finder.TraverseType(*E)) 11134 return true; 11135 } 11136 break; 11137 } 11138 11139 return false; 11140 } 11141 11142 bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11143 FindCXXThisExpr Finder(*this); 11144 11145 // Check attributes. 11146 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11147 A != AEnd; ++A) { 11148 // FIXME: This should be emitted by tblgen. 11149 Expr *Arg = 0; 11150 ArrayRef<Expr *> Args; 11151 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11152 Arg = G->getArg(); 11153 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11154 Arg = G->getArg(); 11155 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11156 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11157 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11158 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11159 else if (ExclusiveLockFunctionAttr *ELF 11160 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11161 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11162 else if (SharedLockFunctionAttr *SLF 11163 = dyn_cast<SharedLockFunctionAttr>(*A)) 11164 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11165 else if (ExclusiveTrylockFunctionAttr *ETLF 11166 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11167 Arg = ETLF->getSuccessValue(); 11168 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11169 } else if (SharedTrylockFunctionAttr *STLF 11170 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11171 Arg = STLF->getSuccessValue(); 11172 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11173 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11174 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11175 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11176 Arg = LR->getArg(); 11177 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11178 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11179 else if (ExclusiveLocksRequiredAttr *ELR 11180 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11181 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11182 else if (SharedLocksRequiredAttr *SLR 11183 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11184 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11185 11186 if (Arg && !Finder.TraverseStmt(Arg)) 11187 return true; 11188 11189 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11190 if (!Finder.TraverseStmt(Args[I])) 11191 return true; 11192 } 11193 } 11194 11195 return false; 11196 } 11197 11198 void 11199 Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 11200 ArrayRef<ParsedType> DynamicExceptions, 11201 ArrayRef<SourceRange> DynamicExceptionRanges, 11202 Expr *NoexceptExpr, 11203 llvm::SmallVectorImpl<QualType> &Exceptions, 11204 FunctionProtoType::ExtProtoInfo &EPI) { 11205 Exceptions.clear(); 11206 EPI.ExceptionSpecType = EST; 11207 if (EST == EST_Dynamic) { 11208 Exceptions.reserve(DynamicExceptions.size()); 11209 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 11210 // FIXME: Preserve type source info. 11211 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 11212 11213 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 11214 collectUnexpandedParameterPacks(ET, Unexpanded); 11215 if (!Unexpanded.empty()) { 11216 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 11217 UPPC_ExceptionType, 11218 Unexpanded); 11219 continue; 11220 } 11221 11222 // Check that the type is valid for an exception spec, and 11223 // drop it if not. 11224 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 11225 Exceptions.push_back(ET); 11226 } 11227 EPI.NumExceptions = Exceptions.size(); 11228 EPI.Exceptions = Exceptions.data(); 11229 return; 11230 } 11231 11232 if (EST == EST_ComputedNoexcept) { 11233 // If an error occurred, there's no expression here. 11234 if (NoexceptExpr) { 11235 assert((NoexceptExpr->isTypeDependent() || 11236 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 11237 Context.BoolTy) && 11238 "Parser should have made sure that the expression is boolean"); 11239 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 11240 EPI.ExceptionSpecType = EST_BasicNoexcept; 11241 return; 11242 } 11243 11244 if (!NoexceptExpr->isValueDependent()) 11245 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 11246 diag::err_noexcept_needs_constant_expression, 11247 /*AllowFold*/ false).take(); 11248 EPI.NoexceptExpr = NoexceptExpr; 11249 } 11250 return; 11251 } 11252 } 11253 11254 /// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11255 Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11256 // Implicitly declared functions (e.g. copy constructors) are 11257 // __host__ __device__ 11258 if (D->isImplicit()) 11259 return CFT_HostDevice; 11260 11261 if (D->hasAttr<CUDAGlobalAttr>()) 11262 return CFT_Global; 11263 11264 if (D->hasAttr<CUDADeviceAttr>()) { 11265 if (D->hasAttr<CUDAHostAttr>()) 11266 return CFT_HostDevice; 11267 else 11268 return CFT_Device; 11269 } 11270 11271 return CFT_Host; 11272 } 11273 11274 bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11275 CUDAFunctionTarget CalleeTarget) { 11276 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11277 // Callable from the device only." 11278 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11279 return true; 11280 11281 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11282 // Callable from the host only." 11283 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11284 // Callable from the host only." 11285 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11286 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11287 return true; 11288 11289 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11290 return true; 11291 11292 return false; 11293 } 11294