SemaDeclCXX.cpp revision e5e575ded9cd4b80229fb299a2d97e9d44728eda
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/AST/ASTConsumer.h" 16#include "clang/AST/ASTContext.h" 17#include "clang/AST/ASTMutationListener.h" 18#include "clang/AST/CXXInheritance.h" 19#include "clang/AST/CharUnits.h" 20#include "clang/AST/DeclVisitor.h" 21#include "clang/AST/EvaluatedExprVisitor.h" 22#include "clang/AST/ExprCXX.h" 23#include "clang/AST/RecordLayout.h" 24#include "clang/AST/RecursiveASTVisitor.h" 25#include "clang/AST/StmtVisitor.h" 26#include "clang/AST/TypeLoc.h" 27#include "clang/AST/TypeOrdering.h" 28#include "clang/Basic/PartialDiagnostic.h" 29#include "clang/Basic/TargetInfo.h" 30#include "clang/Lex/Preprocessor.h" 31#include "clang/Sema/CXXFieldCollector.h" 32#include "clang/Sema/DeclSpec.h" 33#include "clang/Sema/Initialization.h" 34#include "clang/Sema/Lookup.h" 35#include "clang/Sema/ParsedTemplate.h" 36#include "clang/Sema/Scope.h" 37#include "clang/Sema/ScopeInfo.h" 38#include "llvm/ADT/STLExtras.h" 39#include "llvm/ADT/SmallString.h" 40#include <map> 41#include <set> 42 43using namespace clang; 44 45//===----------------------------------------------------------------------===// 46// CheckDefaultArgumentVisitor 47//===----------------------------------------------------------------------===// 48 49namespace { 50 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 51 /// the default argument of a parameter to determine whether it 52 /// contains any ill-formed subexpressions. For example, this will 53 /// diagnose the use of local variables or parameters within the 54 /// default argument expression. 55 class CheckDefaultArgumentVisitor 56 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 57 Expr *DefaultArg; 58 Sema *S; 59 60 public: 61 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 62 : DefaultArg(defarg), S(s) {} 63 64 bool VisitExpr(Expr *Node); 65 bool VisitDeclRefExpr(DeclRefExpr *DRE); 66 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 67 bool VisitLambdaExpr(LambdaExpr *Lambda); 68 bool VisitPseudoObjectExpr(PseudoObjectExpr *POE); 69 }; 70 71 /// VisitExpr - Visit all of the children of this expression. 72 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 73 bool IsInvalid = false; 74 for (Stmt::child_range I = Node->children(); I; ++I) 75 IsInvalid |= Visit(*I); 76 return IsInvalid; 77 } 78 79 /// VisitDeclRefExpr - Visit a reference to a declaration, to 80 /// determine whether this declaration can be used in the default 81 /// argument expression. 82 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 83 NamedDecl *Decl = DRE->getDecl(); 84 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 85 // C++ [dcl.fct.default]p9 86 // Default arguments are evaluated each time the function is 87 // called. The order of evaluation of function arguments is 88 // unspecified. Consequently, parameters of a function shall not 89 // be used in default argument expressions, even if they are not 90 // evaluated. Parameters of a function declared before a default 91 // argument expression are in scope and can hide namespace and 92 // class member names. 93 return S->Diag(DRE->getLocStart(), 94 diag::err_param_default_argument_references_param) 95 << Param->getDeclName() << DefaultArg->getSourceRange(); 96 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 97 // C++ [dcl.fct.default]p7 98 // Local variables shall not be used in default argument 99 // expressions. 100 if (VDecl->isLocalVarDecl()) 101 return S->Diag(DRE->getLocStart(), 102 diag::err_param_default_argument_references_local) 103 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 104 } 105 106 return false; 107 } 108 109 /// VisitCXXThisExpr - Visit a C++ "this" expression. 110 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 111 // C++ [dcl.fct.default]p8: 112 // The keyword this shall not be used in a default argument of a 113 // member function. 114 return S->Diag(ThisE->getLocStart(), 115 diag::err_param_default_argument_references_this) 116 << ThisE->getSourceRange(); 117 } 118 119 bool CheckDefaultArgumentVisitor::VisitPseudoObjectExpr(PseudoObjectExpr *POE) { 120 bool Invalid = false; 121 for (PseudoObjectExpr::semantics_iterator 122 i = POE->semantics_begin(), e = POE->semantics_end(); i != e; ++i) { 123 Expr *E = *i; 124 125 // Look through bindings. 126 if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) { 127 E = OVE->getSourceExpr(); 128 assert(E && "pseudo-object binding without source expression?"); 129 } 130 131 Invalid |= Visit(E); 132 } 133 return Invalid; 134 } 135 136 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 137 // C++11 [expr.lambda.prim]p13: 138 // A lambda-expression appearing in a default argument shall not 139 // implicitly or explicitly capture any entity. 140 if (Lambda->capture_begin() == Lambda->capture_end()) 141 return false; 142 143 return S->Diag(Lambda->getLocStart(), 144 diag::err_lambda_capture_default_arg); 145 } 146} 147 148void 149Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, 150 const CXXMethodDecl *Method) { 151 // If we have an MSAny spec already, don't bother. 152 if (!Method || ComputedEST == EST_MSAny) 153 return; 154 155 const FunctionProtoType *Proto 156 = Method->getType()->getAs<FunctionProtoType>(); 157 Proto = Self->ResolveExceptionSpec(CallLoc, Proto); 158 if (!Proto) 159 return; 160 161 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 162 163 // If this function can throw any exceptions, make a note of that. 164 if (EST == EST_MSAny || EST == EST_None) { 165 ClearExceptions(); 166 ComputedEST = EST; 167 return; 168 } 169 170 // FIXME: If the call to this decl is using any of its default arguments, we 171 // need to search them for potentially-throwing calls. 172 173 // If this function has a basic noexcept, it doesn't affect the outcome. 174 if (EST == EST_BasicNoexcept) 175 return; 176 177 // If we have a throw-all spec at this point, ignore the function. 178 if (ComputedEST == EST_None) 179 return; 180 181 // If we're still at noexcept(true) and there's a nothrow() callee, 182 // change to that specification. 183 if (EST == EST_DynamicNone) { 184 if (ComputedEST == EST_BasicNoexcept) 185 ComputedEST = EST_DynamicNone; 186 return; 187 } 188 189 // Check out noexcept specs. 190 if (EST == EST_ComputedNoexcept) { 191 FunctionProtoType::NoexceptResult NR = 192 Proto->getNoexceptSpec(Self->Context); 193 assert(NR != FunctionProtoType::NR_NoNoexcept && 194 "Must have noexcept result for EST_ComputedNoexcept."); 195 assert(NR != FunctionProtoType::NR_Dependent && 196 "Should not generate implicit declarations for dependent cases, " 197 "and don't know how to handle them anyway."); 198 199 // noexcept(false) -> no spec on the new function 200 if (NR == FunctionProtoType::NR_Throw) { 201 ClearExceptions(); 202 ComputedEST = EST_None; 203 } 204 // noexcept(true) won't change anything either. 205 return; 206 } 207 208 assert(EST == EST_Dynamic && "EST case not considered earlier."); 209 assert(ComputedEST != EST_None && 210 "Shouldn't collect exceptions when throw-all is guaranteed."); 211 ComputedEST = EST_Dynamic; 212 // Record the exceptions in this function's exception specification. 213 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 214 EEnd = Proto->exception_end(); 215 E != EEnd; ++E) 216 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E))) 217 Exceptions.push_back(*E); 218} 219 220void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 221 if (!E || ComputedEST == EST_MSAny) 222 return; 223 224 // FIXME: 225 // 226 // C++0x [except.spec]p14: 227 // [An] implicit exception-specification specifies the type-id T if and 228 // only if T is allowed by the exception-specification of a function directly 229 // invoked by f's implicit definition; f shall allow all exceptions if any 230 // function it directly invokes allows all exceptions, and f shall allow no 231 // exceptions if every function it directly invokes allows no exceptions. 232 // 233 // Note in particular that if an implicit exception-specification is generated 234 // for a function containing a throw-expression, that specification can still 235 // be noexcept(true). 236 // 237 // Note also that 'directly invoked' is not defined in the standard, and there 238 // is no indication that we should only consider potentially-evaluated calls. 239 // 240 // Ultimately we should implement the intent of the standard: the exception 241 // specification should be the set of exceptions which can be thrown by the 242 // implicit definition. For now, we assume that any non-nothrow expression can 243 // throw any exception. 244 245 if (Self->canThrow(E)) 246 ComputedEST = EST_None; 247} 248 249bool 250Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 251 SourceLocation EqualLoc) { 252 if (RequireCompleteType(Param->getLocation(), Param->getType(), 253 diag::err_typecheck_decl_incomplete_type)) { 254 Param->setInvalidDecl(); 255 return true; 256 } 257 258 // C++ [dcl.fct.default]p5 259 // A default argument expression is implicitly converted (clause 260 // 4) to the parameter type. The default argument expression has 261 // the same semantic constraints as the initializer expression in 262 // a declaration of a variable of the parameter type, using the 263 // copy-initialization semantics (8.5). 264 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 265 Param); 266 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 267 EqualLoc); 268 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 269 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg); 270 if (Result.isInvalid()) 271 return true; 272 Arg = Result.takeAs<Expr>(); 273 274 CheckCompletedExpr(Arg, EqualLoc); 275 Arg = MaybeCreateExprWithCleanups(Arg); 276 277 // Okay: add the default argument to the parameter 278 Param->setDefaultArg(Arg); 279 280 // We have already instantiated this parameter; provide each of the 281 // instantiations with the uninstantiated default argument. 282 UnparsedDefaultArgInstantiationsMap::iterator InstPos 283 = UnparsedDefaultArgInstantiations.find(Param); 284 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 285 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 286 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 287 288 // We're done tracking this parameter's instantiations. 289 UnparsedDefaultArgInstantiations.erase(InstPos); 290 } 291 292 return false; 293} 294 295/// ActOnParamDefaultArgument - Check whether the default argument 296/// provided for a function parameter is well-formed. If so, attach it 297/// to the parameter declaration. 298void 299Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 300 Expr *DefaultArg) { 301 if (!param || !DefaultArg) 302 return; 303 304 ParmVarDecl *Param = cast<ParmVarDecl>(param); 305 UnparsedDefaultArgLocs.erase(Param); 306 307 // Default arguments are only permitted in C++ 308 if (!getLangOpts().CPlusPlus) { 309 Diag(EqualLoc, diag::err_param_default_argument) 310 << DefaultArg->getSourceRange(); 311 Param->setInvalidDecl(); 312 return; 313 } 314 315 // Check for unexpanded parameter packs. 316 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 317 Param->setInvalidDecl(); 318 return; 319 } 320 321 // Check that the default argument is well-formed 322 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 323 if (DefaultArgChecker.Visit(DefaultArg)) { 324 Param->setInvalidDecl(); 325 return; 326 } 327 328 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 329} 330 331/// ActOnParamUnparsedDefaultArgument - We've seen a default 332/// argument for a function parameter, but we can't parse it yet 333/// because we're inside a class definition. Note that this default 334/// argument will be parsed later. 335void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 336 SourceLocation EqualLoc, 337 SourceLocation ArgLoc) { 338 if (!param) 339 return; 340 341 ParmVarDecl *Param = cast<ParmVarDecl>(param); 342 if (Param) 343 Param->setUnparsedDefaultArg(); 344 345 UnparsedDefaultArgLocs[Param] = ArgLoc; 346} 347 348/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 349/// the default argument for the parameter param failed. 350void Sema::ActOnParamDefaultArgumentError(Decl *param) { 351 if (!param) 352 return; 353 354 ParmVarDecl *Param = cast<ParmVarDecl>(param); 355 356 Param->setInvalidDecl(); 357 358 UnparsedDefaultArgLocs.erase(Param); 359} 360 361/// CheckExtraCXXDefaultArguments - Check for any extra default 362/// arguments in the declarator, which is not a function declaration 363/// or definition and therefore is not permitted to have default 364/// arguments. This routine should be invoked for every declarator 365/// that is not a function declaration or definition. 366void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 367 // C++ [dcl.fct.default]p3 368 // A default argument expression shall be specified only in the 369 // parameter-declaration-clause of a function declaration or in a 370 // template-parameter (14.1). It shall not be specified for a 371 // parameter pack. If it is specified in a 372 // parameter-declaration-clause, it shall not occur within a 373 // declarator or abstract-declarator of a parameter-declaration. 374 bool MightBeFunction = D.isFunctionDeclarationContext(); 375 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 376 DeclaratorChunk &chunk = D.getTypeObject(i); 377 if (chunk.Kind == DeclaratorChunk::Function) { 378 if (MightBeFunction) { 379 // This is a function declaration. It can have default arguments, but 380 // keep looking in case its return type is a function type with default 381 // arguments. 382 MightBeFunction = false; 383 continue; 384 } 385 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 386 ParmVarDecl *Param = 387 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 388 if (Param->hasUnparsedDefaultArg()) { 389 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 390 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 391 << SourceRange((*Toks)[1].getLocation(), 392 Toks->back().getLocation()); 393 delete Toks; 394 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 395 } else if (Param->getDefaultArg()) { 396 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 397 << Param->getDefaultArg()->getSourceRange(); 398 Param->setDefaultArg(0); 399 } 400 } 401 } else if (chunk.Kind != DeclaratorChunk::Paren) { 402 MightBeFunction = false; 403 } 404 } 405} 406 407/// MergeCXXFunctionDecl - Merge two declarations of the same C++ 408/// function, once we already know that they have the same 409/// type. Subroutine of MergeFunctionDecl. Returns true if there was an 410/// error, false otherwise. 411bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, 412 Scope *S) { 413 bool Invalid = false; 414 415 // C++ [dcl.fct.default]p4: 416 // For non-template functions, default arguments can be added in 417 // later declarations of a function in the same 418 // scope. Declarations in different scopes have completely 419 // distinct sets of default arguments. That is, declarations in 420 // inner scopes do not acquire default arguments from 421 // declarations in outer scopes, and vice versa. In a given 422 // function declaration, all parameters subsequent to a 423 // parameter with a default argument shall have default 424 // arguments supplied in this or previous declarations. A 425 // default argument shall not be redefined by a later 426 // declaration (not even to the same value). 427 // 428 // C++ [dcl.fct.default]p6: 429 // Except for member functions of class templates, the default arguments 430 // in a member function definition that appears outside of the class 431 // definition are added to the set of default arguments provided by the 432 // member function declaration in the class definition. 433 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 434 ParmVarDecl *OldParam = Old->getParamDecl(p); 435 ParmVarDecl *NewParam = New->getParamDecl(p); 436 437 bool OldParamHasDfl = OldParam->hasDefaultArg(); 438 bool NewParamHasDfl = NewParam->hasDefaultArg(); 439 440 NamedDecl *ND = Old; 441 if (S && !isDeclInScope(ND, New->getDeclContext(), S)) 442 // Ignore default parameters of old decl if they are not in 443 // the same scope. 444 OldParamHasDfl = false; 445 446 if (OldParamHasDfl && NewParamHasDfl) { 447 448 unsigned DiagDefaultParamID = 449 diag::err_param_default_argument_redefinition; 450 451 // MSVC accepts that default parameters be redefined for member functions 452 // of template class. The new default parameter's value is ignored. 453 Invalid = true; 454 if (getLangOpts().MicrosoftExt) { 455 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 456 if (MD && MD->getParent()->getDescribedClassTemplate()) { 457 // Merge the old default argument into the new parameter. 458 NewParam->setHasInheritedDefaultArg(); 459 if (OldParam->hasUninstantiatedDefaultArg()) 460 NewParam->setUninstantiatedDefaultArg( 461 OldParam->getUninstantiatedDefaultArg()); 462 else 463 NewParam->setDefaultArg(OldParam->getInit()); 464 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 465 Invalid = false; 466 } 467 } 468 469 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 470 // hint here. Alternatively, we could walk the type-source information 471 // for NewParam to find the last source location in the type... but it 472 // isn't worth the effort right now. This is the kind of test case that 473 // is hard to get right: 474 // int f(int); 475 // void g(int (*fp)(int) = f); 476 // void g(int (*fp)(int) = &f); 477 Diag(NewParam->getLocation(), DiagDefaultParamID) 478 << NewParam->getDefaultArgRange(); 479 480 // Look for the function declaration where the default argument was 481 // actually written, which may be a declaration prior to Old. 482 for (FunctionDecl *Older = Old->getPreviousDecl(); 483 Older; Older = Older->getPreviousDecl()) { 484 if (!Older->getParamDecl(p)->hasDefaultArg()) 485 break; 486 487 OldParam = Older->getParamDecl(p); 488 } 489 490 Diag(OldParam->getLocation(), diag::note_previous_definition) 491 << OldParam->getDefaultArgRange(); 492 } else if (OldParamHasDfl) { 493 // Merge the old default argument into the new parameter. 494 // It's important to use getInit() here; getDefaultArg() 495 // strips off any top-level ExprWithCleanups. 496 NewParam->setHasInheritedDefaultArg(); 497 if (OldParam->hasUninstantiatedDefaultArg()) 498 NewParam->setUninstantiatedDefaultArg( 499 OldParam->getUninstantiatedDefaultArg()); 500 else 501 NewParam->setDefaultArg(OldParam->getInit()); 502 } else if (NewParamHasDfl) { 503 if (New->getDescribedFunctionTemplate()) { 504 // Paragraph 4, quoted above, only applies to non-template functions. 505 Diag(NewParam->getLocation(), 506 diag::err_param_default_argument_template_redecl) 507 << NewParam->getDefaultArgRange(); 508 Diag(Old->getLocation(), diag::note_template_prev_declaration) 509 << false; 510 } else if (New->getTemplateSpecializationKind() 511 != TSK_ImplicitInstantiation && 512 New->getTemplateSpecializationKind() != TSK_Undeclared) { 513 // C++ [temp.expr.spec]p21: 514 // Default function arguments shall not be specified in a declaration 515 // or a definition for one of the following explicit specializations: 516 // - the explicit specialization of a function template; 517 // - the explicit specialization of a member function template; 518 // - the explicit specialization of a member function of a class 519 // template where the class template specialization to which the 520 // member function specialization belongs is implicitly 521 // instantiated. 522 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 523 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 524 << New->getDeclName() 525 << NewParam->getDefaultArgRange(); 526 } else if (New->getDeclContext()->isDependentContext()) { 527 // C++ [dcl.fct.default]p6 (DR217): 528 // Default arguments for a member function of a class template shall 529 // be specified on the initial declaration of the member function 530 // within the class template. 531 // 532 // Reading the tea leaves a bit in DR217 and its reference to DR205 533 // leads me to the conclusion that one cannot add default function 534 // arguments for an out-of-line definition of a member function of a 535 // dependent type. 536 int WhichKind = 2; 537 if (CXXRecordDecl *Record 538 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 539 if (Record->getDescribedClassTemplate()) 540 WhichKind = 0; 541 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 542 WhichKind = 1; 543 else 544 WhichKind = 2; 545 } 546 547 Diag(NewParam->getLocation(), 548 diag::err_param_default_argument_member_template_redecl) 549 << WhichKind 550 << NewParam->getDefaultArgRange(); 551 } 552 } 553 } 554 555 // DR1344: If a default argument is added outside a class definition and that 556 // default argument makes the function a special member function, the program 557 // is ill-formed. This can only happen for constructors. 558 if (isa<CXXConstructorDecl>(New) && 559 New->getMinRequiredArguments() < Old->getMinRequiredArguments()) { 560 CXXSpecialMember NewSM = getSpecialMember(cast<CXXMethodDecl>(New)), 561 OldSM = getSpecialMember(cast<CXXMethodDecl>(Old)); 562 if (NewSM != OldSM) { 563 ParmVarDecl *NewParam = New->getParamDecl(New->getMinRequiredArguments()); 564 assert(NewParam->hasDefaultArg()); 565 Diag(NewParam->getLocation(), diag::err_default_arg_makes_ctor_special) 566 << NewParam->getDefaultArgRange() << NewSM; 567 Diag(Old->getLocation(), diag::note_previous_declaration); 568 } 569 } 570 571 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 572 // template has a constexpr specifier then all its declarations shall 573 // contain the constexpr specifier. 574 if (New->isConstexpr() != Old->isConstexpr()) { 575 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 576 << New << New->isConstexpr(); 577 Diag(Old->getLocation(), diag::note_previous_declaration); 578 Invalid = true; 579 } 580 581 if (CheckEquivalentExceptionSpec(Old, New)) 582 Invalid = true; 583 584 return Invalid; 585} 586 587/// \brief Merge the exception specifications of two variable declarations. 588/// 589/// This is called when there's a redeclaration of a VarDecl. The function 590/// checks if the redeclaration might have an exception specification and 591/// validates compatibility and merges the specs if necessary. 592void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 593 // Shortcut if exceptions are disabled. 594 if (!getLangOpts().CXXExceptions) 595 return; 596 597 assert(Context.hasSameType(New->getType(), Old->getType()) && 598 "Should only be called if types are otherwise the same."); 599 600 QualType NewType = New->getType(); 601 QualType OldType = Old->getType(); 602 603 // We're only interested in pointers and references to functions, as well 604 // as pointers to member functions. 605 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 606 NewType = R->getPointeeType(); 607 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 608 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 609 NewType = P->getPointeeType(); 610 OldType = OldType->getAs<PointerType>()->getPointeeType(); 611 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 612 NewType = M->getPointeeType(); 613 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 614 } 615 616 if (!NewType->isFunctionProtoType()) 617 return; 618 619 // There's lots of special cases for functions. For function pointers, system 620 // libraries are hopefully not as broken so that we don't need these 621 // workarounds. 622 if (CheckEquivalentExceptionSpec( 623 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 624 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 625 New->setInvalidDecl(); 626 } 627} 628 629/// CheckCXXDefaultArguments - Verify that the default arguments for a 630/// function declaration are well-formed according to C++ 631/// [dcl.fct.default]. 632void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 633 unsigned NumParams = FD->getNumParams(); 634 unsigned p; 635 636 // Find first parameter with a default argument 637 for (p = 0; p < NumParams; ++p) { 638 ParmVarDecl *Param = FD->getParamDecl(p); 639 if (Param->hasDefaultArg()) 640 break; 641 } 642 643 // C++ [dcl.fct.default]p4: 644 // In a given function declaration, all parameters 645 // subsequent to a parameter with a default argument shall 646 // have default arguments supplied in this or previous 647 // declarations. A default argument shall not be redefined 648 // by a later declaration (not even to the same value). 649 unsigned LastMissingDefaultArg = 0; 650 for (; p < NumParams; ++p) { 651 ParmVarDecl *Param = FD->getParamDecl(p); 652 if (!Param->hasDefaultArg()) { 653 if (Param->isInvalidDecl()) 654 /* We already complained about this parameter. */; 655 else if (Param->getIdentifier()) 656 Diag(Param->getLocation(), 657 diag::err_param_default_argument_missing_name) 658 << Param->getIdentifier(); 659 else 660 Diag(Param->getLocation(), 661 diag::err_param_default_argument_missing); 662 663 LastMissingDefaultArg = p; 664 } 665 } 666 667 if (LastMissingDefaultArg > 0) { 668 // Some default arguments were missing. Clear out all of the 669 // default arguments up to (and including) the last missing 670 // default argument, so that we leave the function parameters 671 // in a semantically valid state. 672 for (p = 0; p <= LastMissingDefaultArg; ++p) { 673 ParmVarDecl *Param = FD->getParamDecl(p); 674 if (Param->hasDefaultArg()) { 675 Param->setDefaultArg(0); 676 } 677 } 678 } 679} 680 681// CheckConstexprParameterTypes - Check whether a function's parameter types 682// are all literal types. If so, return true. If not, produce a suitable 683// diagnostic and return false. 684static bool CheckConstexprParameterTypes(Sema &SemaRef, 685 const FunctionDecl *FD) { 686 unsigned ArgIndex = 0; 687 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 688 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 689 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 690 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 691 SourceLocation ParamLoc = PD->getLocation(); 692 if (!(*i)->isDependentType() && 693 SemaRef.RequireLiteralType(ParamLoc, *i, 694 diag::err_constexpr_non_literal_param, 695 ArgIndex+1, PD->getSourceRange(), 696 isa<CXXConstructorDecl>(FD))) 697 return false; 698 } 699 return true; 700} 701 702/// \brief Get diagnostic %select index for tag kind for 703/// record diagnostic message. 704/// WARNING: Indexes apply to particular diagnostics only! 705/// 706/// \returns diagnostic %select index. 707static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) { 708 switch (Tag) { 709 case TTK_Struct: return 0; 710 case TTK_Interface: return 1; 711 case TTK_Class: return 2; 712 default: llvm_unreachable("Invalid tag kind for record diagnostic!"); 713 } 714} 715 716// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 717// the requirements of a constexpr function definition or a constexpr 718// constructor definition. If so, return true. If not, produce appropriate 719// diagnostics and return false. 720// 721// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 722bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 723 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 724 if (MD && MD->isInstance()) { 725 // C++11 [dcl.constexpr]p4: 726 // The definition of a constexpr constructor shall satisfy the following 727 // constraints: 728 // - the class shall not have any virtual base classes; 729 const CXXRecordDecl *RD = MD->getParent(); 730 if (RD->getNumVBases()) { 731 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 732 << isa<CXXConstructorDecl>(NewFD) 733 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 734 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 735 E = RD->vbases_end(); I != E; ++I) 736 Diag(I->getLocStart(), 737 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 738 return false; 739 } 740 } 741 742 if (!isa<CXXConstructorDecl>(NewFD)) { 743 // C++11 [dcl.constexpr]p3: 744 // The definition of a constexpr function shall satisfy the following 745 // constraints: 746 // - it shall not be virtual; 747 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 748 if (Method && Method->isVirtual()) { 749 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 750 751 // If it's not obvious why this function is virtual, find an overridden 752 // function which uses the 'virtual' keyword. 753 const CXXMethodDecl *WrittenVirtual = Method; 754 while (!WrittenVirtual->isVirtualAsWritten()) 755 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 756 if (WrittenVirtual != Method) 757 Diag(WrittenVirtual->getLocation(), 758 diag::note_overridden_virtual_function); 759 return false; 760 } 761 762 // - its return type shall be a literal type; 763 QualType RT = NewFD->getResultType(); 764 if (!RT->isDependentType() && 765 RequireLiteralType(NewFD->getLocation(), RT, 766 diag::err_constexpr_non_literal_return)) 767 return false; 768 } 769 770 // - each of its parameter types shall be a literal type; 771 if (!CheckConstexprParameterTypes(*this, NewFD)) 772 return false; 773 774 return true; 775} 776 777/// Check the given declaration statement is legal within a constexpr function 778/// body. C++11 [dcl.constexpr]p3,p4, and C++1y [dcl.constexpr]p3. 779/// 780/// \return true if the body is OK (maybe only as an extension), false if we 781/// have diagnosed a problem. 782static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 783 DeclStmt *DS, SourceLocation &Cxx1yLoc) { 784 // C++11 [dcl.constexpr]p3 and p4: 785 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 786 // contain only 787 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 788 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 789 switch ((*DclIt)->getKind()) { 790 case Decl::StaticAssert: 791 case Decl::Using: 792 case Decl::UsingShadow: 793 case Decl::UsingDirective: 794 case Decl::UnresolvedUsingTypename: 795 case Decl::UnresolvedUsingValue: 796 // - static_assert-declarations 797 // - using-declarations, 798 // - using-directives, 799 continue; 800 801 case Decl::Typedef: 802 case Decl::TypeAlias: { 803 // - typedef declarations and alias-declarations that do not define 804 // classes or enumerations, 805 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 806 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 807 // Don't allow variably-modified types in constexpr functions. 808 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 809 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 810 << TL.getSourceRange() << TL.getType() 811 << isa<CXXConstructorDecl>(Dcl); 812 return false; 813 } 814 continue; 815 } 816 817 case Decl::Enum: 818 case Decl::CXXRecord: 819 // C++1y allows types to be defined, not just declared. 820 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) 821 SemaRef.Diag(DS->getLocStart(), 822 SemaRef.getLangOpts().CPlusPlus1y 823 ? diag::warn_cxx11_compat_constexpr_type_definition 824 : diag::ext_constexpr_type_definition) 825 << isa<CXXConstructorDecl>(Dcl); 826 continue; 827 828 case Decl::EnumConstant: 829 case Decl::IndirectField: 830 case Decl::ParmVar: 831 // These can only appear with other declarations which are banned in 832 // C++11 and permitted in C++1y, so ignore them. 833 continue; 834 835 case Decl::Var: { 836 // C++1y [dcl.constexpr]p3 allows anything except: 837 // a definition of a variable of non-literal type or of static or 838 // thread storage duration or for which no initialization is performed. 839 VarDecl *VD = cast<VarDecl>(*DclIt); 840 if (VD->isThisDeclarationADefinition()) { 841 if (VD->isStaticLocal()) { 842 SemaRef.Diag(VD->getLocation(), 843 diag::err_constexpr_local_var_static) 844 << isa<CXXConstructorDecl>(Dcl) 845 << (VD->getTLSKind() == VarDecl::TLS_Dynamic); 846 return false; 847 } 848 if (SemaRef.RequireLiteralType( 849 VD->getLocation(), VD->getType(), 850 diag::err_constexpr_local_var_non_literal_type, 851 isa<CXXConstructorDecl>(Dcl))) 852 return false; 853 if (!VD->hasInit()) { 854 SemaRef.Diag(VD->getLocation(), 855 diag::err_constexpr_local_var_no_init) 856 << isa<CXXConstructorDecl>(Dcl); 857 return false; 858 } 859 } 860 SemaRef.Diag(VD->getLocation(), 861 SemaRef.getLangOpts().CPlusPlus1y 862 ? diag::warn_cxx11_compat_constexpr_local_var 863 : diag::ext_constexpr_local_var) 864 << isa<CXXConstructorDecl>(Dcl); 865 continue; 866 } 867 868 case Decl::NamespaceAlias: 869 case Decl::Function: 870 // These are disallowed in C++11 and permitted in C++1y. Allow them 871 // everywhere as an extension. 872 if (!Cxx1yLoc.isValid()) 873 Cxx1yLoc = DS->getLocStart(); 874 continue; 875 876 default: 877 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 878 << isa<CXXConstructorDecl>(Dcl); 879 return false; 880 } 881 } 882 883 return true; 884} 885 886/// Check that the given field is initialized within a constexpr constructor. 887/// 888/// \param Dcl The constexpr constructor being checked. 889/// \param Field The field being checked. This may be a member of an anonymous 890/// struct or union nested within the class being checked. 891/// \param Inits All declarations, including anonymous struct/union members and 892/// indirect members, for which any initialization was provided. 893/// \param Diagnosed Set to true if an error is produced. 894static void CheckConstexprCtorInitializer(Sema &SemaRef, 895 const FunctionDecl *Dcl, 896 FieldDecl *Field, 897 llvm::SmallSet<Decl*, 16> &Inits, 898 bool &Diagnosed) { 899 if (Field->isUnnamedBitfield()) 900 return; 901 902 if (Field->isAnonymousStructOrUnion() && 903 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 904 return; 905 906 if (!Inits.count(Field)) { 907 if (!Diagnosed) { 908 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 909 Diagnosed = true; 910 } 911 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 912 } else if (Field->isAnonymousStructOrUnion()) { 913 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 914 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 915 I != E; ++I) 916 // If an anonymous union contains an anonymous struct of which any member 917 // is initialized, all members must be initialized. 918 if (!RD->isUnion() || Inits.count(*I)) 919 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 920 } 921} 922 923/// Check the provided statement is allowed in a constexpr function 924/// definition. 925static bool 926CheckConstexprFunctionStmt(Sema &SemaRef, const FunctionDecl *Dcl, Stmt *S, 927 llvm::SmallVectorImpl<SourceLocation> &ReturnStmts, 928 SourceLocation &Cxx1yLoc) { 929 // - its function-body shall be [...] a compound-statement that contains only 930 switch (S->getStmtClass()) { 931 case Stmt::NullStmtClass: 932 // - null statements, 933 return true; 934 935 case Stmt::DeclStmtClass: 936 // - static_assert-declarations 937 // - using-declarations, 938 // - using-directives, 939 // - typedef declarations and alias-declarations that do not define 940 // classes or enumerations, 941 if (!CheckConstexprDeclStmt(SemaRef, Dcl, cast<DeclStmt>(S), Cxx1yLoc)) 942 return false; 943 return true; 944 945 case Stmt::ReturnStmtClass: 946 // - and exactly one return statement; 947 if (isa<CXXConstructorDecl>(Dcl)) { 948 // C++1y allows return statements in constexpr constructors. 949 if (!Cxx1yLoc.isValid()) 950 Cxx1yLoc = S->getLocStart(); 951 return true; 952 } 953 954 ReturnStmts.push_back(S->getLocStart()); 955 return true; 956 957 case Stmt::CompoundStmtClass: { 958 // C++1y allows compound-statements. 959 if (!Cxx1yLoc.isValid()) 960 Cxx1yLoc = S->getLocStart(); 961 962 CompoundStmt *CompStmt = cast<CompoundStmt>(S); 963 for (CompoundStmt::body_iterator BodyIt = CompStmt->body_begin(), 964 BodyEnd = CompStmt->body_end(); BodyIt != BodyEnd; ++BodyIt) { 965 if (!CheckConstexprFunctionStmt(SemaRef, Dcl, *BodyIt, ReturnStmts, 966 Cxx1yLoc)) 967 return false; 968 } 969 return true; 970 } 971 972 case Stmt::AttributedStmtClass: 973 if (!Cxx1yLoc.isValid()) 974 Cxx1yLoc = S->getLocStart(); 975 return true; 976 977 case Stmt::IfStmtClass: { 978 // C++1y allows if-statements. 979 if (!Cxx1yLoc.isValid()) 980 Cxx1yLoc = S->getLocStart(); 981 982 IfStmt *If = cast<IfStmt>(S); 983 if (!CheckConstexprFunctionStmt(SemaRef, Dcl, If->getThen(), ReturnStmts, 984 Cxx1yLoc)) 985 return false; 986 if (If->getElse() && 987 !CheckConstexprFunctionStmt(SemaRef, Dcl, If->getElse(), ReturnStmts, 988 Cxx1yLoc)) 989 return false; 990 return true; 991 } 992 993 case Stmt::WhileStmtClass: 994 case Stmt::DoStmtClass: 995 case Stmt::ForStmtClass: 996 case Stmt::CXXForRangeStmtClass: 997 case Stmt::ContinueStmtClass: 998 // C++1y allows all of these. We don't allow them as extensions in C++11, 999 // because they don't make sense without variable mutation. 1000 if (!SemaRef.getLangOpts().CPlusPlus1y) 1001 break; 1002 if (!Cxx1yLoc.isValid()) 1003 Cxx1yLoc = S->getLocStart(); 1004 for (Stmt::child_range Children = S->children(); Children; ++Children) 1005 if (*Children && 1006 !CheckConstexprFunctionStmt(SemaRef, Dcl, *Children, ReturnStmts, 1007 Cxx1yLoc)) 1008 return false; 1009 return true; 1010 1011 case Stmt::SwitchStmtClass: 1012 case Stmt::CaseStmtClass: 1013 case Stmt::DefaultStmtClass: 1014 case Stmt::BreakStmtClass: 1015 // C++1y allows switch-statements, and since they don't need variable 1016 // mutation, we can reasonably allow them in C++11 as an extension. 1017 if (!Cxx1yLoc.isValid()) 1018 Cxx1yLoc = S->getLocStart(); 1019 for (Stmt::child_range Children = S->children(); Children; ++Children) 1020 if (*Children && 1021 !CheckConstexprFunctionStmt(SemaRef, Dcl, *Children, ReturnStmts, 1022 Cxx1yLoc)) 1023 return false; 1024 return true; 1025 1026 default: 1027 if (!isa<Expr>(S)) 1028 break; 1029 1030 // C++1y allows expression-statements. 1031 if (!Cxx1yLoc.isValid()) 1032 Cxx1yLoc = S->getLocStart(); 1033 return true; 1034 } 1035 1036 SemaRef.Diag(S->getLocStart(), diag::err_constexpr_body_invalid_stmt) 1037 << isa<CXXConstructorDecl>(Dcl); 1038 return false; 1039} 1040 1041/// Check the body for the given constexpr function declaration only contains 1042/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 1043/// 1044/// \return true if the body is OK, false if we have diagnosed a problem. 1045bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 1046 if (isa<CXXTryStmt>(Body)) { 1047 // C++11 [dcl.constexpr]p3: 1048 // The definition of a constexpr function shall satisfy the following 1049 // constraints: [...] 1050 // - its function-body shall be = delete, = default, or a 1051 // compound-statement 1052 // 1053 // C++11 [dcl.constexpr]p4: 1054 // In the definition of a constexpr constructor, [...] 1055 // - its function-body shall not be a function-try-block; 1056 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 1057 << isa<CXXConstructorDecl>(Dcl); 1058 return false; 1059 } 1060 1061 SmallVector<SourceLocation, 4> ReturnStmts; 1062 1063 // - its function-body shall be [...] a compound-statement that contains only 1064 // [... list of cases ...] 1065 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 1066 SourceLocation Cxx1yLoc; 1067 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 1068 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 1069 if (!CheckConstexprFunctionStmt(*this, Dcl, *BodyIt, ReturnStmts, Cxx1yLoc)) 1070 return false; 1071 } 1072 1073 if (Cxx1yLoc.isValid()) 1074 Diag(Cxx1yLoc, 1075 getLangOpts().CPlusPlus1y 1076 ? diag::warn_cxx11_compat_constexpr_body_invalid_stmt 1077 : diag::ext_constexpr_body_invalid_stmt) 1078 << isa<CXXConstructorDecl>(Dcl); 1079 1080 if (const CXXConstructorDecl *Constructor 1081 = dyn_cast<CXXConstructorDecl>(Dcl)) { 1082 const CXXRecordDecl *RD = Constructor->getParent(); 1083 // DR1359: 1084 // - every non-variant non-static data member and base class sub-object 1085 // shall be initialized; 1086 // - if the class is a non-empty union, or for each non-empty anonymous 1087 // union member of a non-union class, exactly one non-static data member 1088 // shall be initialized; 1089 if (RD->isUnion()) { 1090 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 1091 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 1092 return false; 1093 } 1094 } else if (!Constructor->isDependentContext() && 1095 !Constructor->isDelegatingConstructor()) { 1096 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 1097 1098 // Skip detailed checking if we have enough initializers, and we would 1099 // allow at most one initializer per member. 1100 bool AnyAnonStructUnionMembers = false; 1101 unsigned Fields = 0; 1102 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 1103 E = RD->field_end(); I != E; ++I, ++Fields) { 1104 if (I->isAnonymousStructOrUnion()) { 1105 AnyAnonStructUnionMembers = true; 1106 break; 1107 } 1108 } 1109 if (AnyAnonStructUnionMembers || 1110 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 1111 // Check initialization of non-static data members. Base classes are 1112 // always initialized so do not need to be checked. Dependent bases 1113 // might not have initializers in the member initializer list. 1114 llvm::SmallSet<Decl*, 16> Inits; 1115 for (CXXConstructorDecl::init_const_iterator 1116 I = Constructor->init_begin(), E = Constructor->init_end(); 1117 I != E; ++I) { 1118 if (FieldDecl *FD = (*I)->getMember()) 1119 Inits.insert(FD); 1120 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 1121 Inits.insert(ID->chain_begin(), ID->chain_end()); 1122 } 1123 1124 bool Diagnosed = false; 1125 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 1126 E = RD->field_end(); I != E; ++I) 1127 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 1128 if (Diagnosed) 1129 return false; 1130 } 1131 } 1132 } else { 1133 if (ReturnStmts.empty()) { 1134 // C++1y doesn't require constexpr functions to contain a 'return' 1135 // statement. We still do, unless the return type is void, because 1136 // otherwise if there's no return statement, the function cannot 1137 // be used in a core constant expression. 1138 Diag(Dcl->getLocation(), 1139 getLangOpts().CPlusPlus1y && Dcl->getResultType()->isVoidType() 1140 ? diag::warn_cxx11_compat_constexpr_body_no_return 1141 : diag::err_constexpr_body_no_return); 1142 return false; 1143 } 1144 if (ReturnStmts.size() > 1) { 1145 Diag(ReturnStmts.back(), 1146 getLangOpts().CPlusPlus1y 1147 ? diag::warn_cxx11_compat_constexpr_body_multiple_return 1148 : diag::ext_constexpr_body_multiple_return); 1149 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 1150 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 1151 } 1152 } 1153 1154 // C++11 [dcl.constexpr]p5: 1155 // if no function argument values exist such that the function invocation 1156 // substitution would produce a constant expression, the program is 1157 // ill-formed; no diagnostic required. 1158 // C++11 [dcl.constexpr]p3: 1159 // - every constructor call and implicit conversion used in initializing the 1160 // return value shall be one of those allowed in a constant expression. 1161 // C++11 [dcl.constexpr]p4: 1162 // - every constructor involved in initializing non-static data members and 1163 // base class sub-objects shall be a constexpr constructor. 1164 SmallVector<PartialDiagnosticAt, 8> Diags; 1165 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 1166 Diag(Dcl->getLocation(), diag::ext_constexpr_function_never_constant_expr) 1167 << isa<CXXConstructorDecl>(Dcl); 1168 for (size_t I = 0, N = Diags.size(); I != N; ++I) 1169 Diag(Diags[I].first, Diags[I].second); 1170 // Don't return false here: we allow this for compatibility in 1171 // system headers. 1172 } 1173 1174 return true; 1175} 1176 1177/// isCurrentClassName - Determine whether the identifier II is the 1178/// name of the class type currently being defined. In the case of 1179/// nested classes, this will only return true if II is the name of 1180/// the innermost class. 1181bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 1182 const CXXScopeSpec *SS) { 1183 assert(getLangOpts().CPlusPlus && "No class names in C!"); 1184 1185 CXXRecordDecl *CurDecl; 1186 if (SS && SS->isSet() && !SS->isInvalid()) { 1187 DeclContext *DC = computeDeclContext(*SS, true); 1188 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 1189 } else 1190 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1191 1192 if (CurDecl && CurDecl->getIdentifier()) 1193 return &II == CurDecl->getIdentifier(); 1194 else 1195 return false; 1196} 1197 1198/// \brief Determine whether the given class is a base class of the given 1199/// class, including looking at dependent bases. 1200static bool findCircularInheritance(const CXXRecordDecl *Class, 1201 const CXXRecordDecl *Current) { 1202 SmallVector<const CXXRecordDecl*, 8> Queue; 1203 1204 Class = Class->getCanonicalDecl(); 1205 while (true) { 1206 for (CXXRecordDecl::base_class_const_iterator I = Current->bases_begin(), 1207 E = Current->bases_end(); 1208 I != E; ++I) { 1209 CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); 1210 if (!Base) 1211 continue; 1212 1213 Base = Base->getDefinition(); 1214 if (!Base) 1215 continue; 1216 1217 if (Base->getCanonicalDecl() == Class) 1218 return true; 1219 1220 Queue.push_back(Base); 1221 } 1222 1223 if (Queue.empty()) 1224 return false; 1225 1226 Current = Queue.back(); 1227 Queue.pop_back(); 1228 } 1229 1230 return false; 1231} 1232 1233/// \brief Check the validity of a C++ base class specifier. 1234/// 1235/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1236/// and returns NULL otherwise. 1237CXXBaseSpecifier * 1238Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1239 SourceRange SpecifierRange, 1240 bool Virtual, AccessSpecifier Access, 1241 TypeSourceInfo *TInfo, 1242 SourceLocation EllipsisLoc) { 1243 QualType BaseType = TInfo->getType(); 1244 1245 // C++ [class.union]p1: 1246 // A union shall not have base classes. 1247 if (Class->isUnion()) { 1248 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1249 << SpecifierRange; 1250 return 0; 1251 } 1252 1253 if (EllipsisLoc.isValid() && 1254 !TInfo->getType()->containsUnexpandedParameterPack()) { 1255 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1256 << TInfo->getTypeLoc().getSourceRange(); 1257 EllipsisLoc = SourceLocation(); 1258 } 1259 1260 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1261 1262 if (BaseType->isDependentType()) { 1263 // Make sure that we don't have circular inheritance among our dependent 1264 // bases. For non-dependent bases, the check for completeness below handles 1265 // this. 1266 if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) { 1267 if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() || 1268 ((BaseDecl = BaseDecl->getDefinition()) && 1269 findCircularInheritance(Class, BaseDecl))) { 1270 Diag(BaseLoc, diag::err_circular_inheritance) 1271 << BaseType << Context.getTypeDeclType(Class); 1272 1273 if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl()) 1274 Diag(BaseDecl->getLocation(), diag::note_previous_decl) 1275 << BaseType; 1276 1277 return 0; 1278 } 1279 } 1280 1281 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1282 Class->getTagKind() == TTK_Class, 1283 Access, TInfo, EllipsisLoc); 1284 } 1285 1286 // Base specifiers must be record types. 1287 if (!BaseType->isRecordType()) { 1288 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1289 return 0; 1290 } 1291 1292 // C++ [class.union]p1: 1293 // A union shall not be used as a base class. 1294 if (BaseType->isUnionType()) { 1295 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1296 return 0; 1297 } 1298 1299 // C++ [class.derived]p2: 1300 // The class-name in a base-specifier shall not be an incompletely 1301 // defined class. 1302 if (RequireCompleteType(BaseLoc, BaseType, 1303 diag::err_incomplete_base_class, SpecifierRange)) { 1304 Class->setInvalidDecl(); 1305 return 0; 1306 } 1307 1308 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1309 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1310 assert(BaseDecl && "Record type has no declaration"); 1311 BaseDecl = BaseDecl->getDefinition(); 1312 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1313 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1314 assert(CXXBaseDecl && "Base type is not a C++ type"); 1315 1316 // C++ [class]p3: 1317 // If a class is marked final and it appears as a base-type-specifier in 1318 // base-clause, the program is ill-formed. 1319 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1320 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1321 << CXXBaseDecl->getDeclName(); 1322 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1323 << CXXBaseDecl->getDeclName(); 1324 return 0; 1325 } 1326 1327 if (BaseDecl->isInvalidDecl()) 1328 Class->setInvalidDecl(); 1329 1330 // Create the base specifier. 1331 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1332 Class->getTagKind() == TTK_Class, 1333 Access, TInfo, EllipsisLoc); 1334} 1335 1336/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1337/// one entry in the base class list of a class specifier, for 1338/// example: 1339/// class foo : public bar, virtual private baz { 1340/// 'public bar' and 'virtual private baz' are each base-specifiers. 1341BaseResult 1342Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1343 ParsedAttributes &Attributes, 1344 bool Virtual, AccessSpecifier Access, 1345 ParsedType basetype, SourceLocation BaseLoc, 1346 SourceLocation EllipsisLoc) { 1347 if (!classdecl) 1348 return true; 1349 1350 AdjustDeclIfTemplate(classdecl); 1351 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1352 if (!Class) 1353 return true; 1354 1355 // We do not support any C++11 attributes on base-specifiers yet. 1356 // Diagnose any attributes we see. 1357 if (!Attributes.empty()) { 1358 for (AttributeList *Attr = Attributes.getList(); Attr; 1359 Attr = Attr->getNext()) { 1360 if (Attr->isInvalid() || 1361 Attr->getKind() == AttributeList::IgnoredAttribute) 1362 continue; 1363 Diag(Attr->getLoc(), 1364 Attr->getKind() == AttributeList::UnknownAttribute 1365 ? diag::warn_unknown_attribute_ignored 1366 : diag::err_base_specifier_attribute) 1367 << Attr->getName(); 1368 } 1369 } 1370 1371 TypeSourceInfo *TInfo = 0; 1372 GetTypeFromParser(basetype, &TInfo); 1373 1374 if (EllipsisLoc.isInvalid() && 1375 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1376 UPPC_BaseType)) 1377 return true; 1378 1379 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1380 Virtual, Access, TInfo, 1381 EllipsisLoc)) 1382 return BaseSpec; 1383 else 1384 Class->setInvalidDecl(); 1385 1386 return true; 1387} 1388 1389/// \brief Performs the actual work of attaching the given base class 1390/// specifiers to a C++ class. 1391bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1392 unsigned NumBases) { 1393 if (NumBases == 0) 1394 return false; 1395 1396 // Used to keep track of which base types we have already seen, so 1397 // that we can properly diagnose redundant direct base types. Note 1398 // that the key is always the unqualified canonical type of the base 1399 // class. 1400 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1401 1402 // Copy non-redundant base specifiers into permanent storage. 1403 unsigned NumGoodBases = 0; 1404 bool Invalid = false; 1405 for (unsigned idx = 0; idx < NumBases; ++idx) { 1406 QualType NewBaseType 1407 = Context.getCanonicalType(Bases[idx]->getType()); 1408 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1409 1410 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1411 if (KnownBase) { 1412 // C++ [class.mi]p3: 1413 // A class shall not be specified as a direct base class of a 1414 // derived class more than once. 1415 Diag(Bases[idx]->getLocStart(), 1416 diag::err_duplicate_base_class) 1417 << KnownBase->getType() 1418 << Bases[idx]->getSourceRange(); 1419 1420 // Delete the duplicate base class specifier; we're going to 1421 // overwrite its pointer later. 1422 Context.Deallocate(Bases[idx]); 1423 1424 Invalid = true; 1425 } else { 1426 // Okay, add this new base class. 1427 KnownBase = Bases[idx]; 1428 Bases[NumGoodBases++] = Bases[idx]; 1429 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) { 1430 const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); 1431 if (Class->isInterface() && 1432 (!RD->isInterface() || 1433 KnownBase->getAccessSpecifier() != AS_public)) { 1434 // The Microsoft extension __interface does not permit bases that 1435 // are not themselves public interfaces. 1436 Diag(KnownBase->getLocStart(), diag::err_invalid_base_in_interface) 1437 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getName() 1438 << RD->getSourceRange(); 1439 Invalid = true; 1440 } 1441 if (RD->hasAttr<WeakAttr>()) 1442 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1443 } 1444 } 1445 } 1446 1447 // Attach the remaining base class specifiers to the derived class. 1448 Class->setBases(Bases, NumGoodBases); 1449 1450 // Delete the remaining (good) base class specifiers, since their 1451 // data has been copied into the CXXRecordDecl. 1452 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1453 Context.Deallocate(Bases[idx]); 1454 1455 return Invalid; 1456} 1457 1458/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1459/// class, after checking whether there are any duplicate base 1460/// classes. 1461void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1462 unsigned NumBases) { 1463 if (!ClassDecl || !Bases || !NumBases) 1464 return; 1465 1466 AdjustDeclIfTemplate(ClassDecl); 1467 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1468 (CXXBaseSpecifier**)(Bases), NumBases); 1469} 1470 1471/// \brief Determine whether the type \p Derived is a C++ class that is 1472/// derived from the type \p Base. 1473bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1474 if (!getLangOpts().CPlusPlus) 1475 return false; 1476 1477 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); 1478 if (!DerivedRD) 1479 return false; 1480 1481 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); 1482 if (!BaseRD) 1483 return false; 1484 1485 // If either the base or the derived type is invalid, don't try to 1486 // check whether one is derived from the other. 1487 if (BaseRD->isInvalidDecl() || DerivedRD->isInvalidDecl()) 1488 return false; 1489 1490 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1491 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1492} 1493 1494/// \brief Determine whether the type \p Derived is a C++ class that is 1495/// derived from the type \p Base. 1496bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1497 if (!getLangOpts().CPlusPlus) 1498 return false; 1499 1500 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); 1501 if (!DerivedRD) 1502 return false; 1503 1504 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); 1505 if (!BaseRD) 1506 return false; 1507 1508 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1509} 1510 1511void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1512 CXXCastPath &BasePathArray) { 1513 assert(BasePathArray.empty() && "Base path array must be empty!"); 1514 assert(Paths.isRecordingPaths() && "Must record paths!"); 1515 1516 const CXXBasePath &Path = Paths.front(); 1517 1518 // We first go backward and check if we have a virtual base. 1519 // FIXME: It would be better if CXXBasePath had the base specifier for 1520 // the nearest virtual base. 1521 unsigned Start = 0; 1522 for (unsigned I = Path.size(); I != 0; --I) { 1523 if (Path[I - 1].Base->isVirtual()) { 1524 Start = I - 1; 1525 break; 1526 } 1527 } 1528 1529 // Now add all bases. 1530 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1531 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1532} 1533 1534/// \brief Determine whether the given base path includes a virtual 1535/// base class. 1536bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1537 for (CXXCastPath::const_iterator B = BasePath.begin(), 1538 BEnd = BasePath.end(); 1539 B != BEnd; ++B) 1540 if ((*B)->isVirtual()) 1541 return true; 1542 1543 return false; 1544} 1545 1546/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1547/// conversion (where Derived and Base are class types) is 1548/// well-formed, meaning that the conversion is unambiguous (and 1549/// that all of the base classes are accessible). Returns true 1550/// and emits a diagnostic if the code is ill-formed, returns false 1551/// otherwise. Loc is the location where this routine should point to 1552/// if there is an error, and Range is the source range to highlight 1553/// if there is an error. 1554bool 1555Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1556 unsigned InaccessibleBaseID, 1557 unsigned AmbigiousBaseConvID, 1558 SourceLocation Loc, SourceRange Range, 1559 DeclarationName Name, 1560 CXXCastPath *BasePath) { 1561 // First, determine whether the path from Derived to Base is 1562 // ambiguous. This is slightly more expensive than checking whether 1563 // the Derived to Base conversion exists, because here we need to 1564 // explore multiple paths to determine if there is an ambiguity. 1565 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1566 /*DetectVirtual=*/false); 1567 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1568 assert(DerivationOkay && 1569 "Can only be used with a derived-to-base conversion"); 1570 (void)DerivationOkay; 1571 1572 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1573 if (InaccessibleBaseID) { 1574 // Check that the base class can be accessed. 1575 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1576 InaccessibleBaseID)) { 1577 case AR_inaccessible: 1578 return true; 1579 case AR_accessible: 1580 case AR_dependent: 1581 case AR_delayed: 1582 break; 1583 } 1584 } 1585 1586 // Build a base path if necessary. 1587 if (BasePath) 1588 BuildBasePathArray(Paths, *BasePath); 1589 return false; 1590 } 1591 1592 // We know that the derived-to-base conversion is ambiguous, and 1593 // we're going to produce a diagnostic. Perform the derived-to-base 1594 // search just one more time to compute all of the possible paths so 1595 // that we can print them out. This is more expensive than any of 1596 // the previous derived-to-base checks we've done, but at this point 1597 // performance isn't as much of an issue. 1598 Paths.clear(); 1599 Paths.setRecordingPaths(true); 1600 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1601 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1602 (void)StillOkay; 1603 1604 // Build up a textual representation of the ambiguous paths, e.g., 1605 // D -> B -> A, that will be used to illustrate the ambiguous 1606 // conversions in the diagnostic. We only print one of the paths 1607 // to each base class subobject. 1608 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1609 1610 Diag(Loc, AmbigiousBaseConvID) 1611 << Derived << Base << PathDisplayStr << Range << Name; 1612 return true; 1613} 1614 1615bool 1616Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1617 SourceLocation Loc, SourceRange Range, 1618 CXXCastPath *BasePath, 1619 bool IgnoreAccess) { 1620 return CheckDerivedToBaseConversion(Derived, Base, 1621 IgnoreAccess ? 0 1622 : diag::err_upcast_to_inaccessible_base, 1623 diag::err_ambiguous_derived_to_base_conv, 1624 Loc, Range, DeclarationName(), 1625 BasePath); 1626} 1627 1628 1629/// @brief Builds a string representing ambiguous paths from a 1630/// specific derived class to different subobjects of the same base 1631/// class. 1632/// 1633/// This function builds a string that can be used in error messages 1634/// to show the different paths that one can take through the 1635/// inheritance hierarchy to go from the derived class to different 1636/// subobjects of a base class. The result looks something like this: 1637/// @code 1638/// struct D -> struct B -> struct A 1639/// struct D -> struct C -> struct A 1640/// @endcode 1641std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1642 std::string PathDisplayStr; 1643 std::set<unsigned> DisplayedPaths; 1644 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1645 Path != Paths.end(); ++Path) { 1646 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1647 // We haven't displayed a path to this particular base 1648 // class subobject yet. 1649 PathDisplayStr += "\n "; 1650 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1651 for (CXXBasePath::const_iterator Element = Path->begin(); 1652 Element != Path->end(); ++Element) 1653 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1654 } 1655 } 1656 1657 return PathDisplayStr; 1658} 1659 1660//===----------------------------------------------------------------------===// 1661// C++ class member Handling 1662//===----------------------------------------------------------------------===// 1663 1664/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1665bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1666 SourceLocation ASLoc, 1667 SourceLocation ColonLoc, 1668 AttributeList *Attrs) { 1669 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1670 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1671 ASLoc, ColonLoc); 1672 CurContext->addHiddenDecl(ASDecl); 1673 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1674} 1675 1676/// CheckOverrideControl - Check C++11 override control semantics. 1677void Sema::CheckOverrideControl(Decl *D) { 1678 if (D->isInvalidDecl()) 1679 return; 1680 1681 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1682 1683 // Do we know which functions this declaration might be overriding? 1684 bool OverridesAreKnown = !MD || 1685 (!MD->getParent()->hasAnyDependentBases() && 1686 !MD->getType()->isDependentType()); 1687 1688 if (!MD || !MD->isVirtual()) { 1689 if (OverridesAreKnown) { 1690 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1691 Diag(OA->getLocation(), 1692 diag::override_keyword_only_allowed_on_virtual_member_functions) 1693 << "override" << FixItHint::CreateRemoval(OA->getLocation()); 1694 D->dropAttr<OverrideAttr>(); 1695 } 1696 if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1697 Diag(FA->getLocation(), 1698 diag::override_keyword_only_allowed_on_virtual_member_functions) 1699 << "final" << FixItHint::CreateRemoval(FA->getLocation()); 1700 D->dropAttr<FinalAttr>(); 1701 } 1702 } 1703 return; 1704 } 1705 1706 if (!OverridesAreKnown) 1707 return; 1708 1709 // C++11 [class.virtual]p5: 1710 // If a virtual function is marked with the virt-specifier override and 1711 // does not override a member function of a base class, the program is 1712 // ill-formed. 1713 bool HasOverriddenMethods = 1714 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1715 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) 1716 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) 1717 << MD->getDeclName(); 1718} 1719 1720/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1721/// function overrides a virtual member function marked 'final', according to 1722/// C++11 [class.virtual]p4. 1723bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1724 const CXXMethodDecl *Old) { 1725 if (!Old->hasAttr<FinalAttr>()) 1726 return false; 1727 1728 Diag(New->getLocation(), diag::err_final_function_overridden) 1729 << New->getDeclName(); 1730 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1731 return true; 1732} 1733 1734static bool InitializationHasSideEffects(const FieldDecl &FD) { 1735 const Type *T = FD.getType()->getBaseElementTypeUnsafe(); 1736 // FIXME: Destruction of ObjC lifetime types has side-effects. 1737 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) 1738 return !RD->isCompleteDefinition() || 1739 !RD->hasTrivialDefaultConstructor() || 1740 !RD->hasTrivialDestructor(); 1741 return false; 1742} 1743 1744static AttributeList *getMSPropertyAttr(AttributeList *list) { 1745 for (AttributeList* it = list; it != 0; it = it->getNext()) 1746 if (it->isDeclspecPropertyAttribute()) 1747 return it; 1748 return 0; 1749} 1750 1751/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1752/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1753/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1754/// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1755/// present (but parsing it has been deferred). 1756NamedDecl * 1757Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1758 MultiTemplateParamsArg TemplateParameterLists, 1759 Expr *BW, const VirtSpecifiers &VS, 1760 InClassInitStyle InitStyle) { 1761 const DeclSpec &DS = D.getDeclSpec(); 1762 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1763 DeclarationName Name = NameInfo.getName(); 1764 SourceLocation Loc = NameInfo.getLoc(); 1765 1766 // For anonymous bitfields, the location should point to the type. 1767 if (Loc.isInvalid()) 1768 Loc = D.getLocStart(); 1769 1770 Expr *BitWidth = static_cast<Expr*>(BW); 1771 1772 assert(isa<CXXRecordDecl>(CurContext)); 1773 assert(!DS.isFriendSpecified()); 1774 1775 bool isFunc = D.isDeclarationOfFunction(); 1776 1777 if (cast<CXXRecordDecl>(CurContext)->isInterface()) { 1778 // The Microsoft extension __interface only permits public member functions 1779 // and prohibits constructors, destructors, operators, non-public member 1780 // functions, static methods and data members. 1781 unsigned InvalidDecl; 1782 bool ShowDeclName = true; 1783 if (!isFunc) 1784 InvalidDecl = (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) ? 0 : 1; 1785 else if (AS != AS_public) 1786 InvalidDecl = 2; 1787 else if (DS.getStorageClassSpec() == DeclSpec::SCS_static) 1788 InvalidDecl = 3; 1789 else switch (Name.getNameKind()) { 1790 case DeclarationName::CXXConstructorName: 1791 InvalidDecl = 4; 1792 ShowDeclName = false; 1793 break; 1794 1795 case DeclarationName::CXXDestructorName: 1796 InvalidDecl = 5; 1797 ShowDeclName = false; 1798 break; 1799 1800 case DeclarationName::CXXOperatorName: 1801 case DeclarationName::CXXConversionFunctionName: 1802 InvalidDecl = 6; 1803 break; 1804 1805 default: 1806 InvalidDecl = 0; 1807 break; 1808 } 1809 1810 if (InvalidDecl) { 1811 if (ShowDeclName) 1812 Diag(Loc, diag::err_invalid_member_in_interface) 1813 << (InvalidDecl-1) << Name; 1814 else 1815 Diag(Loc, diag::err_invalid_member_in_interface) 1816 << (InvalidDecl-1) << ""; 1817 return 0; 1818 } 1819 } 1820 1821 // C++ 9.2p6: A member shall not be declared to have automatic storage 1822 // duration (auto, register) or with the extern storage-class-specifier. 1823 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1824 // data members and cannot be applied to names declared const or static, 1825 // and cannot be applied to reference members. 1826 switch (DS.getStorageClassSpec()) { 1827 case DeclSpec::SCS_unspecified: 1828 case DeclSpec::SCS_typedef: 1829 case DeclSpec::SCS_static: 1830 break; 1831 case DeclSpec::SCS_mutable: 1832 if (isFunc) { 1833 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1834 1835 // FIXME: It would be nicer if the keyword was ignored only for this 1836 // declarator. Otherwise we could get follow-up errors. 1837 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1838 } 1839 break; 1840 default: 1841 Diag(DS.getStorageClassSpecLoc(), 1842 diag::err_storageclass_invalid_for_member); 1843 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1844 break; 1845 } 1846 1847 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1848 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1849 !isFunc); 1850 1851 if (DS.isConstexprSpecified() && isInstField) { 1852 SemaDiagnosticBuilder B = 1853 Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr_member); 1854 SourceLocation ConstexprLoc = DS.getConstexprSpecLoc(); 1855 if (InitStyle == ICIS_NoInit) { 1856 B << 0 << 0 << FixItHint::CreateReplacement(ConstexprLoc, "const"); 1857 D.getMutableDeclSpec().ClearConstexprSpec(); 1858 const char *PrevSpec; 1859 unsigned DiagID; 1860 bool Failed = D.getMutableDeclSpec().SetTypeQual(DeclSpec::TQ_const, ConstexprLoc, 1861 PrevSpec, DiagID, getLangOpts()); 1862 (void)Failed; 1863 assert(!Failed && "Making a constexpr member const shouldn't fail"); 1864 } else { 1865 B << 1; 1866 const char *PrevSpec; 1867 unsigned DiagID; 1868 if (D.getMutableDeclSpec().SetStorageClassSpec( 1869 *this, DeclSpec::SCS_static, ConstexprLoc, PrevSpec, DiagID)) { 1870 assert(DS.getStorageClassSpec() == DeclSpec::SCS_mutable && 1871 "This is the only DeclSpec that should fail to be applied"); 1872 B << 1; 1873 } else { 1874 B << 0 << FixItHint::CreateInsertion(ConstexprLoc, "static "); 1875 isInstField = false; 1876 } 1877 } 1878 } 1879 1880 NamedDecl *Member; 1881 if (isInstField) { 1882 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1883 1884 // Data members must have identifiers for names. 1885 if (!Name.isIdentifier()) { 1886 Diag(Loc, diag::err_bad_variable_name) 1887 << Name; 1888 return 0; 1889 } 1890 1891 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1892 1893 // Member field could not be with "template" keyword. 1894 // So TemplateParameterLists should be empty in this case. 1895 if (TemplateParameterLists.size()) { 1896 TemplateParameterList* TemplateParams = TemplateParameterLists[0]; 1897 if (TemplateParams->size()) { 1898 // There is no such thing as a member field template. 1899 Diag(D.getIdentifierLoc(), diag::err_template_member) 1900 << II 1901 << SourceRange(TemplateParams->getTemplateLoc(), 1902 TemplateParams->getRAngleLoc()); 1903 } else { 1904 // There is an extraneous 'template<>' for this member. 1905 Diag(TemplateParams->getTemplateLoc(), 1906 diag::err_template_member_noparams) 1907 << II 1908 << SourceRange(TemplateParams->getTemplateLoc(), 1909 TemplateParams->getRAngleLoc()); 1910 } 1911 return 0; 1912 } 1913 1914 if (SS.isSet() && !SS.isInvalid()) { 1915 // The user provided a superfluous scope specifier inside a class 1916 // definition: 1917 // 1918 // class X { 1919 // int X::member; 1920 // }; 1921 if (DeclContext *DC = computeDeclContext(SS, false)) 1922 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1923 else 1924 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1925 << Name << SS.getRange(); 1926 1927 SS.clear(); 1928 } 1929 1930 AttributeList *MSPropertyAttr = 1931 getMSPropertyAttr(D.getDeclSpec().getAttributes().getList()); 1932 if (MSPropertyAttr) { 1933 Member = HandleMSProperty(S, cast<CXXRecordDecl>(CurContext), Loc, D, 1934 BitWidth, InitStyle, AS, MSPropertyAttr); 1935 isInstField = false; 1936 } else { 1937 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, 1938 BitWidth, InitStyle, AS); 1939 } 1940 assert(Member && "HandleField never returns null"); 1941 } else { 1942 assert(InitStyle == ICIS_NoInit || D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static); 1943 1944 Member = HandleDeclarator(S, D, TemplateParameterLists); 1945 if (!Member) { 1946 return 0; 1947 } 1948 1949 // Non-instance-fields can't have a bitfield. 1950 if (BitWidth) { 1951 if (Member->isInvalidDecl()) { 1952 // don't emit another diagnostic. 1953 } else if (isa<VarDecl>(Member)) { 1954 // C++ 9.6p3: A bit-field shall not be a static member. 1955 // "static member 'A' cannot be a bit-field" 1956 Diag(Loc, diag::err_static_not_bitfield) 1957 << Name << BitWidth->getSourceRange(); 1958 } else if (isa<TypedefDecl>(Member)) { 1959 // "typedef member 'x' cannot be a bit-field" 1960 Diag(Loc, diag::err_typedef_not_bitfield) 1961 << Name << BitWidth->getSourceRange(); 1962 } else { 1963 // A function typedef ("typedef int f(); f a;"). 1964 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1965 Diag(Loc, diag::err_not_integral_type_bitfield) 1966 << Name << cast<ValueDecl>(Member)->getType() 1967 << BitWidth->getSourceRange(); 1968 } 1969 1970 BitWidth = 0; 1971 Member->setInvalidDecl(); 1972 } 1973 1974 Member->setAccess(AS); 1975 1976 // If we have declared a member function template, set the access of the 1977 // templated declaration as well. 1978 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1979 FunTmpl->getTemplatedDecl()->setAccess(AS); 1980 } 1981 1982 if (VS.isOverrideSpecified()) 1983 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1984 if (VS.isFinalSpecified()) 1985 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1986 1987 if (VS.getLastLocation().isValid()) { 1988 // Update the end location of a method that has a virt-specifiers. 1989 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1990 MD->setRangeEnd(VS.getLastLocation()); 1991 } 1992 1993 CheckOverrideControl(Member); 1994 1995 assert((Name || isInstField) && "No identifier for non-field ?"); 1996 1997 if (isInstField) { 1998 FieldDecl *FD = cast<FieldDecl>(Member); 1999 FieldCollector->Add(FD); 2000 2001 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 2002 FD->getLocation()) 2003 != DiagnosticsEngine::Ignored) { 2004 // Remember all explicit private FieldDecls that have a name, no side 2005 // effects and are not part of a dependent type declaration. 2006 if (!FD->isImplicit() && FD->getDeclName() && 2007 FD->getAccess() == AS_private && 2008 !FD->hasAttr<UnusedAttr>() && 2009 !FD->getParent()->isDependentContext() && 2010 !InitializationHasSideEffects(*FD)) 2011 UnusedPrivateFields.insert(FD); 2012 } 2013 } 2014 2015 return Member; 2016} 2017 2018namespace { 2019 class UninitializedFieldVisitor 2020 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 2021 Sema &S; 2022 ValueDecl *VD; 2023 public: 2024 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 2025 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context), 2026 S(S) { 2027 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(VD)) 2028 this->VD = IFD->getAnonField(); 2029 else 2030 this->VD = VD; 2031 } 2032 2033 void HandleExpr(Expr *E) { 2034 if (!E) return; 2035 2036 // Expressions like x(x) sometimes lack the surrounding expressions 2037 // but need to be checked anyways. 2038 HandleValue(E); 2039 Visit(E); 2040 } 2041 2042 void HandleValue(Expr *E) { 2043 E = E->IgnoreParens(); 2044 2045 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 2046 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 2047 return; 2048 2049 // FieldME is the inner-most MemberExpr that is not an anonymous struct 2050 // or union. 2051 MemberExpr *FieldME = ME; 2052 2053 Expr *Base = E; 2054 while (isa<MemberExpr>(Base)) { 2055 ME = cast<MemberExpr>(Base); 2056 2057 if (isa<VarDecl>(ME->getMemberDecl())) 2058 return; 2059 2060 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2061 if (!FD->isAnonymousStructOrUnion()) 2062 FieldME = ME; 2063 2064 Base = ME->getBase(); 2065 } 2066 2067 if (VD == FieldME->getMemberDecl() && isa<CXXThisExpr>(Base)) { 2068 unsigned diag = VD->getType()->isReferenceType() 2069 ? diag::warn_reference_field_is_uninit 2070 : diag::warn_field_is_uninit; 2071 S.Diag(FieldME->getExprLoc(), diag) << VD; 2072 } 2073 return; 2074 } 2075 2076 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 2077 HandleValue(CO->getTrueExpr()); 2078 HandleValue(CO->getFalseExpr()); 2079 return; 2080 } 2081 2082 if (BinaryConditionalOperator *BCO = 2083 dyn_cast<BinaryConditionalOperator>(E)) { 2084 HandleValue(BCO->getCommon()); 2085 HandleValue(BCO->getFalseExpr()); 2086 return; 2087 } 2088 2089 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2090 switch (BO->getOpcode()) { 2091 default: 2092 return; 2093 case(BO_PtrMemD): 2094 case(BO_PtrMemI): 2095 HandleValue(BO->getLHS()); 2096 return; 2097 case(BO_Comma): 2098 HandleValue(BO->getRHS()); 2099 return; 2100 } 2101 } 2102 } 2103 2104 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 2105 if (E->getCastKind() == CK_LValueToRValue) 2106 HandleValue(E->getSubExpr()); 2107 2108 Inherited::VisitImplicitCastExpr(E); 2109 } 2110 2111 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 2112 Expr *Callee = E->getCallee(); 2113 if (isa<MemberExpr>(Callee)) 2114 HandleValue(Callee); 2115 2116 Inherited::VisitCXXMemberCallExpr(E); 2117 } 2118 }; 2119 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E, 2120 ValueDecl *VD) { 2121 UninitializedFieldVisitor(S, VD).HandleExpr(E); 2122 } 2123} // namespace 2124 2125/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 2126/// in-class initializer for a non-static C++ class member, and after 2127/// instantiating an in-class initializer in a class template. Such actions 2128/// are deferred until the class is complete. 2129void 2130Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 2131 Expr *InitExpr) { 2132 FieldDecl *FD = cast<FieldDecl>(D); 2133 assert(FD->getInClassInitStyle() != ICIS_NoInit && 2134 "must set init style when field is created"); 2135 2136 if (!InitExpr) { 2137 FD->setInvalidDecl(); 2138 FD->removeInClassInitializer(); 2139 return; 2140 } 2141 2142 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 2143 FD->setInvalidDecl(); 2144 FD->removeInClassInitializer(); 2145 return; 2146 } 2147 2148 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, InitLoc) 2149 != DiagnosticsEngine::Ignored) { 2150 CheckInitExprContainsUninitializedFields(*this, InitExpr, FD); 2151 } 2152 2153 ExprResult Init = InitExpr; 2154 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 2155 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 2156 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 2157 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 2158 } 2159 Expr **Inits = &InitExpr; 2160 unsigned NumInits = 1; 2161 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 2162 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 2163 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 2164 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 2165 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 2166 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 2167 if (Init.isInvalid()) { 2168 FD->setInvalidDecl(); 2169 return; 2170 } 2171 } 2172 2173 // C++11 [class.base.init]p7: 2174 // The initialization of each base and member constitutes a 2175 // full-expression. 2176 Init = ActOnFinishFullExpr(Init.take(), InitLoc); 2177 if (Init.isInvalid()) { 2178 FD->setInvalidDecl(); 2179 return; 2180 } 2181 2182 InitExpr = Init.release(); 2183 2184 FD->setInClassInitializer(InitExpr); 2185} 2186 2187/// \brief Find the direct and/or virtual base specifiers that 2188/// correspond to the given base type, for use in base initialization 2189/// within a constructor. 2190static bool FindBaseInitializer(Sema &SemaRef, 2191 CXXRecordDecl *ClassDecl, 2192 QualType BaseType, 2193 const CXXBaseSpecifier *&DirectBaseSpec, 2194 const CXXBaseSpecifier *&VirtualBaseSpec) { 2195 // First, check for a direct base class. 2196 DirectBaseSpec = 0; 2197 for (CXXRecordDecl::base_class_const_iterator Base 2198 = ClassDecl->bases_begin(); 2199 Base != ClassDecl->bases_end(); ++Base) { 2200 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 2201 // We found a direct base of this type. That's what we're 2202 // initializing. 2203 DirectBaseSpec = &*Base; 2204 break; 2205 } 2206 } 2207 2208 // Check for a virtual base class. 2209 // FIXME: We might be able to short-circuit this if we know in advance that 2210 // there are no virtual bases. 2211 VirtualBaseSpec = 0; 2212 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 2213 // We haven't found a base yet; search the class hierarchy for a 2214 // virtual base class. 2215 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 2216 /*DetectVirtual=*/false); 2217 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 2218 BaseType, Paths)) { 2219 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 2220 Path != Paths.end(); ++Path) { 2221 if (Path->back().Base->isVirtual()) { 2222 VirtualBaseSpec = Path->back().Base; 2223 break; 2224 } 2225 } 2226 } 2227 } 2228 2229 return DirectBaseSpec || VirtualBaseSpec; 2230} 2231 2232/// \brief Handle a C++ member initializer using braced-init-list syntax. 2233MemInitResult 2234Sema::ActOnMemInitializer(Decl *ConstructorD, 2235 Scope *S, 2236 CXXScopeSpec &SS, 2237 IdentifierInfo *MemberOrBase, 2238 ParsedType TemplateTypeTy, 2239 const DeclSpec &DS, 2240 SourceLocation IdLoc, 2241 Expr *InitList, 2242 SourceLocation EllipsisLoc) { 2243 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2244 DS, IdLoc, InitList, 2245 EllipsisLoc); 2246} 2247 2248/// \brief Handle a C++ member initializer using parentheses syntax. 2249MemInitResult 2250Sema::ActOnMemInitializer(Decl *ConstructorD, 2251 Scope *S, 2252 CXXScopeSpec &SS, 2253 IdentifierInfo *MemberOrBase, 2254 ParsedType TemplateTypeTy, 2255 const DeclSpec &DS, 2256 SourceLocation IdLoc, 2257 SourceLocation LParenLoc, 2258 Expr **Args, unsigned NumArgs, 2259 SourceLocation RParenLoc, 2260 SourceLocation EllipsisLoc) { 2261 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, 2262 llvm::makeArrayRef(Args, NumArgs), 2263 RParenLoc); 2264 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2265 DS, IdLoc, List, EllipsisLoc); 2266} 2267 2268namespace { 2269 2270// Callback to only accept typo corrections that can be a valid C++ member 2271// intializer: either a non-static field member or a base class. 2272class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 2273 public: 2274 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 2275 : ClassDecl(ClassDecl) {} 2276 2277 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 2278 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 2279 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 2280 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 2281 else 2282 return isa<TypeDecl>(ND); 2283 } 2284 return false; 2285 } 2286 2287 private: 2288 CXXRecordDecl *ClassDecl; 2289}; 2290 2291} 2292 2293/// \brief Handle a C++ member initializer. 2294MemInitResult 2295Sema::BuildMemInitializer(Decl *ConstructorD, 2296 Scope *S, 2297 CXXScopeSpec &SS, 2298 IdentifierInfo *MemberOrBase, 2299 ParsedType TemplateTypeTy, 2300 const DeclSpec &DS, 2301 SourceLocation IdLoc, 2302 Expr *Init, 2303 SourceLocation EllipsisLoc) { 2304 if (!ConstructorD) 2305 return true; 2306 2307 AdjustDeclIfTemplate(ConstructorD); 2308 2309 CXXConstructorDecl *Constructor 2310 = dyn_cast<CXXConstructorDecl>(ConstructorD); 2311 if (!Constructor) { 2312 // The user wrote a constructor initializer on a function that is 2313 // not a C++ constructor. Ignore the error for now, because we may 2314 // have more member initializers coming; we'll diagnose it just 2315 // once in ActOnMemInitializers. 2316 return true; 2317 } 2318 2319 CXXRecordDecl *ClassDecl = Constructor->getParent(); 2320 2321 // C++ [class.base.init]p2: 2322 // Names in a mem-initializer-id are looked up in the scope of the 2323 // constructor's class and, if not found in that scope, are looked 2324 // up in the scope containing the constructor's definition. 2325 // [Note: if the constructor's class contains a member with the 2326 // same name as a direct or virtual base class of the class, a 2327 // mem-initializer-id naming the member or base class and composed 2328 // of a single identifier refers to the class member. A 2329 // mem-initializer-id for the hidden base class may be specified 2330 // using a qualified name. ] 2331 if (!SS.getScopeRep() && !TemplateTypeTy) { 2332 // Look for a member, first. 2333 DeclContext::lookup_result Result 2334 = ClassDecl->lookup(MemberOrBase); 2335 if (!Result.empty()) { 2336 ValueDecl *Member; 2337 if ((Member = dyn_cast<FieldDecl>(Result.front())) || 2338 (Member = dyn_cast<IndirectFieldDecl>(Result.front()))) { 2339 if (EllipsisLoc.isValid()) 2340 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 2341 << MemberOrBase 2342 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 2343 2344 return BuildMemberInitializer(Member, Init, IdLoc); 2345 } 2346 } 2347 } 2348 // It didn't name a member, so see if it names a class. 2349 QualType BaseType; 2350 TypeSourceInfo *TInfo = 0; 2351 2352 if (TemplateTypeTy) { 2353 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 2354 } else if (DS.getTypeSpecType() == TST_decltype) { 2355 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 2356 } else { 2357 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 2358 LookupParsedName(R, S, &SS); 2359 2360 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 2361 if (!TyD) { 2362 if (R.isAmbiguous()) return true; 2363 2364 // We don't want access-control diagnostics here. 2365 R.suppressDiagnostics(); 2366 2367 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 2368 bool NotUnknownSpecialization = false; 2369 DeclContext *DC = computeDeclContext(SS, false); 2370 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 2371 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 2372 2373 if (!NotUnknownSpecialization) { 2374 // When the scope specifier can refer to a member of an unknown 2375 // specialization, we take it as a type name. 2376 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 2377 SS.getWithLocInContext(Context), 2378 *MemberOrBase, IdLoc); 2379 if (BaseType.isNull()) 2380 return true; 2381 2382 R.clear(); 2383 R.setLookupName(MemberOrBase); 2384 } 2385 } 2386 2387 // If no results were found, try to correct typos. 2388 TypoCorrection Corr; 2389 MemInitializerValidatorCCC Validator(ClassDecl); 2390 if (R.empty() && BaseType.isNull() && 2391 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 2392 Validator, ClassDecl))) { 2393 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 2394 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 2395 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 2396 // We have found a non-static data member with a similar 2397 // name to what was typed; complain and initialize that 2398 // member. 2399 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2400 << MemberOrBase << true << CorrectedQuotedStr 2401 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2402 Diag(Member->getLocation(), diag::note_previous_decl) 2403 << CorrectedQuotedStr; 2404 2405 return BuildMemberInitializer(Member, Init, IdLoc); 2406 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 2407 const CXXBaseSpecifier *DirectBaseSpec; 2408 const CXXBaseSpecifier *VirtualBaseSpec; 2409 if (FindBaseInitializer(*this, ClassDecl, 2410 Context.getTypeDeclType(Type), 2411 DirectBaseSpec, VirtualBaseSpec)) { 2412 // We have found a direct or virtual base class with a 2413 // similar name to what was typed; complain and initialize 2414 // that base class. 2415 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2416 << MemberOrBase << false << CorrectedQuotedStr 2417 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2418 2419 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 2420 : VirtualBaseSpec; 2421 Diag(BaseSpec->getLocStart(), 2422 diag::note_base_class_specified_here) 2423 << BaseSpec->getType() 2424 << BaseSpec->getSourceRange(); 2425 2426 TyD = Type; 2427 } 2428 } 2429 } 2430 2431 if (!TyD && BaseType.isNull()) { 2432 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 2433 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 2434 return true; 2435 } 2436 } 2437 2438 if (BaseType.isNull()) { 2439 BaseType = Context.getTypeDeclType(TyD); 2440 if (SS.isSet()) { 2441 NestedNameSpecifier *Qualifier = 2442 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2443 2444 // FIXME: preserve source range information 2445 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 2446 } 2447 } 2448 } 2449 2450 if (!TInfo) 2451 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 2452 2453 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 2454} 2455 2456/// Checks a member initializer expression for cases where reference (or 2457/// pointer) members are bound to by-value parameters (or their addresses). 2458static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 2459 Expr *Init, 2460 SourceLocation IdLoc) { 2461 QualType MemberTy = Member->getType(); 2462 2463 // We only handle pointers and references currently. 2464 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 2465 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 2466 return; 2467 2468 const bool IsPointer = MemberTy->isPointerType(); 2469 if (IsPointer) { 2470 if (const UnaryOperator *Op 2471 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2472 // The only case we're worried about with pointers requires taking the 2473 // address. 2474 if (Op->getOpcode() != UO_AddrOf) 2475 return; 2476 2477 Init = Op->getSubExpr(); 2478 } else { 2479 // We only handle address-of expression initializers for pointers. 2480 return; 2481 } 2482 } 2483 2484 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 2485 // Taking the address of a temporary will be diagnosed as a hard error. 2486 if (IsPointer) 2487 return; 2488 2489 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 2490 << Member << Init->getSourceRange(); 2491 } else if (const DeclRefExpr *DRE 2492 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2493 // We only warn when referring to a non-reference parameter declaration. 2494 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2495 if (!Parameter || Parameter->getType()->isReferenceType()) 2496 return; 2497 2498 S.Diag(Init->getExprLoc(), 2499 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2500 : diag::warn_bind_ref_member_to_parameter) 2501 << Member << Parameter << Init->getSourceRange(); 2502 } else { 2503 // Other initializers are fine. 2504 return; 2505 } 2506 2507 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2508 << (unsigned)IsPointer; 2509} 2510 2511MemInitResult 2512Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2513 SourceLocation IdLoc) { 2514 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2515 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2516 assert((DirectMember || IndirectMember) && 2517 "Member must be a FieldDecl or IndirectFieldDecl"); 2518 2519 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2520 return true; 2521 2522 if (Member->isInvalidDecl()) 2523 return true; 2524 2525 // Diagnose value-uses of fields to initialize themselves, e.g. 2526 // foo(foo) 2527 // where foo is not also a parameter to the constructor. 2528 // TODO: implement -Wuninitialized and fold this into that framework. 2529 Expr **Args; 2530 unsigned NumArgs; 2531 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2532 Args = ParenList->getExprs(); 2533 NumArgs = ParenList->getNumExprs(); 2534 } else if (InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) { 2535 Args = InitList->getInits(); 2536 NumArgs = InitList->getNumInits(); 2537 } else { 2538 // Template instantiation doesn't reconstruct ParenListExprs for us. 2539 Args = &Init; 2540 NumArgs = 1; 2541 } 2542 2543 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc) 2544 != DiagnosticsEngine::Ignored) 2545 for (unsigned i = 0; i < NumArgs; ++i) 2546 // FIXME: Warn about the case when other fields are used before being 2547 // initialized. For example, let this field be the i'th field. When 2548 // initializing the i'th field, throw a warning if any of the >= i'th 2549 // fields are used, as they are not yet initialized. 2550 // Right now we are only handling the case where the i'th field uses 2551 // itself in its initializer. 2552 // Also need to take into account that some fields may be initialized by 2553 // in-class initializers, see C++11 [class.base.init]p9. 2554 CheckInitExprContainsUninitializedFields(*this, Args[i], Member); 2555 2556 SourceRange InitRange = Init->getSourceRange(); 2557 2558 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2559 // Can't check initialization for a member of dependent type or when 2560 // any of the arguments are type-dependent expressions. 2561 DiscardCleanupsInEvaluationContext(); 2562 } else { 2563 bool InitList = false; 2564 if (isa<InitListExpr>(Init)) { 2565 InitList = true; 2566 Args = &Init; 2567 NumArgs = 1; 2568 2569 if (isStdInitializerList(Member->getType(), 0)) { 2570 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2571 << /*at end of ctor*/1 << InitRange; 2572 } 2573 } 2574 2575 // Initialize the member. 2576 InitializedEntity MemberEntity = 2577 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2578 : InitializedEntity::InitializeMember(IndirectMember, 0); 2579 InitializationKind Kind = 2580 InitList ? InitializationKind::CreateDirectList(IdLoc) 2581 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2582 InitRange.getEnd()); 2583 2584 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2585 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2586 MultiExprArg(Args, NumArgs), 2587 0); 2588 if (MemberInit.isInvalid()) 2589 return true; 2590 2591 // C++11 [class.base.init]p7: 2592 // The initialization of each base and member constitutes a 2593 // full-expression. 2594 MemberInit = ActOnFinishFullExpr(MemberInit.get(), InitRange.getBegin()); 2595 if (MemberInit.isInvalid()) 2596 return true; 2597 2598 Init = MemberInit.get(); 2599 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2600 } 2601 2602 if (DirectMember) { 2603 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2604 InitRange.getBegin(), Init, 2605 InitRange.getEnd()); 2606 } else { 2607 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2608 InitRange.getBegin(), Init, 2609 InitRange.getEnd()); 2610 } 2611} 2612 2613MemInitResult 2614Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2615 CXXRecordDecl *ClassDecl) { 2616 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2617 if (!LangOpts.CPlusPlus11) 2618 return Diag(NameLoc, diag::err_delegating_ctor) 2619 << TInfo->getTypeLoc().getLocalSourceRange(); 2620 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2621 2622 bool InitList = true; 2623 Expr **Args = &Init; 2624 unsigned NumArgs = 1; 2625 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2626 InitList = false; 2627 Args = ParenList->getExprs(); 2628 NumArgs = ParenList->getNumExprs(); 2629 } 2630 2631 SourceRange InitRange = Init->getSourceRange(); 2632 // Initialize the object. 2633 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2634 QualType(ClassDecl->getTypeForDecl(), 0)); 2635 InitializationKind Kind = 2636 InitList ? InitializationKind::CreateDirectList(NameLoc) 2637 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2638 InitRange.getEnd()); 2639 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2640 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2641 MultiExprArg(Args, NumArgs), 2642 0); 2643 if (DelegationInit.isInvalid()) 2644 return true; 2645 2646 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2647 "Delegating constructor with no target?"); 2648 2649 // C++11 [class.base.init]p7: 2650 // The initialization of each base and member constitutes a 2651 // full-expression. 2652 DelegationInit = ActOnFinishFullExpr(DelegationInit.get(), 2653 InitRange.getBegin()); 2654 if (DelegationInit.isInvalid()) 2655 return true; 2656 2657 // If we are in a dependent context, template instantiation will 2658 // perform this type-checking again. Just save the arguments that we 2659 // received in a ParenListExpr. 2660 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2661 // of the information that we have about the base 2662 // initializer. However, deconstructing the ASTs is a dicey process, 2663 // and this approach is far more likely to get the corner cases right. 2664 if (CurContext->isDependentContext()) 2665 DelegationInit = Owned(Init); 2666 2667 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2668 DelegationInit.takeAs<Expr>(), 2669 InitRange.getEnd()); 2670} 2671 2672MemInitResult 2673Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2674 Expr *Init, CXXRecordDecl *ClassDecl, 2675 SourceLocation EllipsisLoc) { 2676 SourceLocation BaseLoc 2677 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2678 2679 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2680 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2681 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2682 2683 // C++ [class.base.init]p2: 2684 // [...] Unless the mem-initializer-id names a nonstatic data 2685 // member of the constructor's class or a direct or virtual base 2686 // of that class, the mem-initializer is ill-formed. A 2687 // mem-initializer-list can initialize a base class using any 2688 // name that denotes that base class type. 2689 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2690 2691 SourceRange InitRange = Init->getSourceRange(); 2692 if (EllipsisLoc.isValid()) { 2693 // This is a pack expansion. 2694 if (!BaseType->containsUnexpandedParameterPack()) { 2695 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2696 << SourceRange(BaseLoc, InitRange.getEnd()); 2697 2698 EllipsisLoc = SourceLocation(); 2699 } 2700 } else { 2701 // Check for any unexpanded parameter packs. 2702 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2703 return true; 2704 2705 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2706 return true; 2707 } 2708 2709 // Check for direct and virtual base classes. 2710 const CXXBaseSpecifier *DirectBaseSpec = 0; 2711 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2712 if (!Dependent) { 2713 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2714 BaseType)) 2715 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2716 2717 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2718 VirtualBaseSpec); 2719 2720 // C++ [base.class.init]p2: 2721 // Unless the mem-initializer-id names a nonstatic data member of the 2722 // constructor's class or a direct or virtual base of that class, the 2723 // mem-initializer is ill-formed. 2724 if (!DirectBaseSpec && !VirtualBaseSpec) { 2725 // If the class has any dependent bases, then it's possible that 2726 // one of those types will resolve to the same type as 2727 // BaseType. Therefore, just treat this as a dependent base 2728 // class initialization. FIXME: Should we try to check the 2729 // initialization anyway? It seems odd. 2730 if (ClassDecl->hasAnyDependentBases()) 2731 Dependent = true; 2732 else 2733 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2734 << BaseType << Context.getTypeDeclType(ClassDecl) 2735 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2736 } 2737 } 2738 2739 if (Dependent) { 2740 DiscardCleanupsInEvaluationContext(); 2741 2742 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2743 /*IsVirtual=*/false, 2744 InitRange.getBegin(), Init, 2745 InitRange.getEnd(), EllipsisLoc); 2746 } 2747 2748 // C++ [base.class.init]p2: 2749 // If a mem-initializer-id is ambiguous because it designates both 2750 // a direct non-virtual base class and an inherited virtual base 2751 // class, the mem-initializer is ill-formed. 2752 if (DirectBaseSpec && VirtualBaseSpec) 2753 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2754 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2755 2756 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2757 if (!BaseSpec) 2758 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2759 2760 // Initialize the base. 2761 bool InitList = true; 2762 Expr **Args = &Init; 2763 unsigned NumArgs = 1; 2764 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2765 InitList = false; 2766 Args = ParenList->getExprs(); 2767 NumArgs = ParenList->getNumExprs(); 2768 } 2769 2770 InitializedEntity BaseEntity = 2771 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2772 InitializationKind Kind = 2773 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2774 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2775 InitRange.getEnd()); 2776 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2777 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2778 MultiExprArg(Args, NumArgs), 0); 2779 if (BaseInit.isInvalid()) 2780 return true; 2781 2782 // C++11 [class.base.init]p7: 2783 // The initialization of each base and member constitutes a 2784 // full-expression. 2785 BaseInit = ActOnFinishFullExpr(BaseInit.get(), InitRange.getBegin()); 2786 if (BaseInit.isInvalid()) 2787 return true; 2788 2789 // If we are in a dependent context, template instantiation will 2790 // perform this type-checking again. Just save the arguments that we 2791 // received in a ParenListExpr. 2792 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2793 // of the information that we have about the base 2794 // initializer. However, deconstructing the ASTs is a dicey process, 2795 // and this approach is far more likely to get the corner cases right. 2796 if (CurContext->isDependentContext()) 2797 BaseInit = Owned(Init); 2798 2799 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2800 BaseSpec->isVirtual(), 2801 InitRange.getBegin(), 2802 BaseInit.takeAs<Expr>(), 2803 InitRange.getEnd(), EllipsisLoc); 2804} 2805 2806// Create a static_cast\<T&&>(expr). 2807static Expr *CastForMoving(Sema &SemaRef, Expr *E, QualType T = QualType()) { 2808 if (T.isNull()) T = E->getType(); 2809 QualType TargetType = SemaRef.BuildReferenceType( 2810 T, /*SpelledAsLValue*/false, SourceLocation(), DeclarationName()); 2811 SourceLocation ExprLoc = E->getLocStart(); 2812 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2813 TargetType, ExprLoc); 2814 2815 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2816 SourceRange(ExprLoc, ExprLoc), 2817 E->getSourceRange()).take(); 2818} 2819 2820/// ImplicitInitializerKind - How an implicit base or member initializer should 2821/// initialize its base or member. 2822enum ImplicitInitializerKind { 2823 IIK_Default, 2824 IIK_Copy, 2825 IIK_Move, 2826 IIK_Inherit 2827}; 2828 2829static bool 2830BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2831 ImplicitInitializerKind ImplicitInitKind, 2832 CXXBaseSpecifier *BaseSpec, 2833 bool IsInheritedVirtualBase, 2834 CXXCtorInitializer *&CXXBaseInit) { 2835 InitializedEntity InitEntity 2836 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2837 IsInheritedVirtualBase); 2838 2839 ExprResult BaseInit; 2840 2841 switch (ImplicitInitKind) { 2842 case IIK_Inherit: { 2843 const CXXRecordDecl *Inherited = 2844 Constructor->getInheritedConstructor()->getParent(); 2845 const CXXRecordDecl *Base = BaseSpec->getType()->getAsCXXRecordDecl(); 2846 if (Base && Inherited->getCanonicalDecl() == Base->getCanonicalDecl()) { 2847 // C++11 [class.inhctor]p8: 2848 // Each expression in the expression-list is of the form 2849 // static_cast<T&&>(p), where p is the name of the corresponding 2850 // constructor parameter and T is the declared type of p. 2851 SmallVector<Expr*, 16> Args; 2852 for (unsigned I = 0, E = Constructor->getNumParams(); I != E; ++I) { 2853 ParmVarDecl *PD = Constructor->getParamDecl(I); 2854 ExprResult ArgExpr = 2855 SemaRef.BuildDeclRefExpr(PD, PD->getType().getNonReferenceType(), 2856 VK_LValue, SourceLocation()); 2857 if (ArgExpr.isInvalid()) 2858 return true; 2859 Args.push_back(CastForMoving(SemaRef, ArgExpr.take(), PD->getType())); 2860 } 2861 2862 InitializationKind InitKind = InitializationKind::CreateDirect( 2863 Constructor->getLocation(), SourceLocation(), SourceLocation()); 2864 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2865 Args.data(), Args.size()); 2866 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, Args); 2867 break; 2868 } 2869 } 2870 // Fall through. 2871 case IIK_Default: { 2872 InitializationKind InitKind 2873 = InitializationKind::CreateDefault(Constructor->getLocation()); 2874 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2875 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2876 break; 2877 } 2878 2879 case IIK_Move: 2880 case IIK_Copy: { 2881 bool Moving = ImplicitInitKind == IIK_Move; 2882 ParmVarDecl *Param = Constructor->getParamDecl(0); 2883 QualType ParamType = Param->getType().getNonReferenceType(); 2884 2885 Expr *CopyCtorArg = 2886 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2887 SourceLocation(), Param, false, 2888 Constructor->getLocation(), ParamType, 2889 VK_LValue, 0); 2890 2891 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2892 2893 // Cast to the base class to avoid ambiguities. 2894 QualType ArgTy = 2895 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2896 ParamType.getQualifiers()); 2897 2898 if (Moving) { 2899 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2900 } 2901 2902 CXXCastPath BasePath; 2903 BasePath.push_back(BaseSpec); 2904 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2905 CK_UncheckedDerivedToBase, 2906 Moving ? VK_XValue : VK_LValue, 2907 &BasePath).take(); 2908 2909 InitializationKind InitKind 2910 = InitializationKind::CreateDirect(Constructor->getLocation(), 2911 SourceLocation(), SourceLocation()); 2912 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2913 &CopyCtorArg, 1); 2914 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2915 MultiExprArg(&CopyCtorArg, 1)); 2916 break; 2917 } 2918 } 2919 2920 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2921 if (BaseInit.isInvalid()) 2922 return true; 2923 2924 CXXBaseInit = 2925 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2926 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2927 SourceLocation()), 2928 BaseSpec->isVirtual(), 2929 SourceLocation(), 2930 BaseInit.takeAs<Expr>(), 2931 SourceLocation(), 2932 SourceLocation()); 2933 2934 return false; 2935} 2936 2937static bool RefersToRValueRef(Expr *MemRef) { 2938 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2939 return Referenced->getType()->isRValueReferenceType(); 2940} 2941 2942static bool 2943BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2944 ImplicitInitializerKind ImplicitInitKind, 2945 FieldDecl *Field, IndirectFieldDecl *Indirect, 2946 CXXCtorInitializer *&CXXMemberInit) { 2947 if (Field->isInvalidDecl()) 2948 return true; 2949 2950 SourceLocation Loc = Constructor->getLocation(); 2951 2952 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2953 bool Moving = ImplicitInitKind == IIK_Move; 2954 ParmVarDecl *Param = Constructor->getParamDecl(0); 2955 QualType ParamType = Param->getType().getNonReferenceType(); 2956 2957 // Suppress copying zero-width bitfields. 2958 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2959 return false; 2960 2961 Expr *MemberExprBase = 2962 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2963 SourceLocation(), Param, false, 2964 Loc, ParamType, VK_LValue, 0); 2965 2966 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2967 2968 if (Moving) { 2969 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2970 } 2971 2972 // Build a reference to this field within the parameter. 2973 CXXScopeSpec SS; 2974 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2975 Sema::LookupMemberName); 2976 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2977 : cast<ValueDecl>(Field), AS_public); 2978 MemberLookup.resolveKind(); 2979 ExprResult CtorArg 2980 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2981 ParamType, Loc, 2982 /*IsArrow=*/false, 2983 SS, 2984 /*TemplateKWLoc=*/SourceLocation(), 2985 /*FirstQualifierInScope=*/0, 2986 MemberLookup, 2987 /*TemplateArgs=*/0); 2988 if (CtorArg.isInvalid()) 2989 return true; 2990 2991 // C++11 [class.copy]p15: 2992 // - if a member m has rvalue reference type T&&, it is direct-initialized 2993 // with static_cast<T&&>(x.m); 2994 if (RefersToRValueRef(CtorArg.get())) { 2995 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2996 } 2997 2998 // When the field we are copying is an array, create index variables for 2999 // each dimension of the array. We use these index variables to subscript 3000 // the source array, and other clients (e.g., CodeGen) will perform the 3001 // necessary iteration with these index variables. 3002 SmallVector<VarDecl *, 4> IndexVariables; 3003 QualType BaseType = Field->getType(); 3004 QualType SizeType = SemaRef.Context.getSizeType(); 3005 bool InitializingArray = false; 3006 while (const ConstantArrayType *Array 3007 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 3008 InitializingArray = true; 3009 // Create the iteration variable for this array index. 3010 IdentifierInfo *IterationVarName = 0; 3011 { 3012 SmallString<8> Str; 3013 llvm::raw_svector_ostream OS(Str); 3014 OS << "__i" << IndexVariables.size(); 3015 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 3016 } 3017 VarDecl *IterationVar 3018 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 3019 IterationVarName, SizeType, 3020 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 3021 SC_None); 3022 IndexVariables.push_back(IterationVar); 3023 3024 // Create a reference to the iteration variable. 3025 ExprResult IterationVarRef 3026 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 3027 assert(!IterationVarRef.isInvalid() && 3028 "Reference to invented variable cannot fail!"); 3029 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 3030 assert(!IterationVarRef.isInvalid() && 3031 "Conversion of invented variable cannot fail!"); 3032 3033 // Subscript the array with this iteration variable. 3034 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 3035 IterationVarRef.take(), 3036 Loc); 3037 if (CtorArg.isInvalid()) 3038 return true; 3039 3040 BaseType = Array->getElementType(); 3041 } 3042 3043 // The array subscript expression is an lvalue, which is wrong for moving. 3044 if (Moving && InitializingArray) 3045 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 3046 3047 // Construct the entity that we will be initializing. For an array, this 3048 // will be first element in the array, which may require several levels 3049 // of array-subscript entities. 3050 SmallVector<InitializedEntity, 4> Entities; 3051 Entities.reserve(1 + IndexVariables.size()); 3052 if (Indirect) 3053 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 3054 else 3055 Entities.push_back(InitializedEntity::InitializeMember(Field)); 3056 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 3057 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 3058 0, 3059 Entities.back())); 3060 3061 // Direct-initialize to use the copy constructor. 3062 InitializationKind InitKind = 3063 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 3064 3065 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 3066 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 3067 &CtorArgE, 1); 3068 3069 ExprResult MemberInit 3070 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 3071 MultiExprArg(&CtorArgE, 1)); 3072 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 3073 if (MemberInit.isInvalid()) 3074 return true; 3075 3076 if (Indirect) { 3077 assert(IndexVariables.size() == 0 && 3078 "Indirect field improperly initialized"); 3079 CXXMemberInit 3080 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 3081 Loc, Loc, 3082 MemberInit.takeAs<Expr>(), 3083 Loc); 3084 } else 3085 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 3086 Loc, MemberInit.takeAs<Expr>(), 3087 Loc, 3088 IndexVariables.data(), 3089 IndexVariables.size()); 3090 return false; 3091 } 3092 3093 assert((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) && 3094 "Unhandled implicit init kind!"); 3095 3096 QualType FieldBaseElementType = 3097 SemaRef.Context.getBaseElementType(Field->getType()); 3098 3099 if (FieldBaseElementType->isRecordType()) { 3100 InitializedEntity InitEntity 3101 = Indirect? InitializedEntity::InitializeMember(Indirect) 3102 : InitializedEntity::InitializeMember(Field); 3103 InitializationKind InitKind = 3104 InitializationKind::CreateDefault(Loc); 3105 3106 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 3107 ExprResult MemberInit = 3108 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 3109 3110 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 3111 if (MemberInit.isInvalid()) 3112 return true; 3113 3114 if (Indirect) 3115 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 3116 Indirect, Loc, 3117 Loc, 3118 MemberInit.get(), 3119 Loc); 3120 else 3121 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 3122 Field, Loc, Loc, 3123 MemberInit.get(), 3124 Loc); 3125 return false; 3126 } 3127 3128 if (!Field->getParent()->isUnion()) { 3129 if (FieldBaseElementType->isReferenceType()) { 3130 SemaRef.Diag(Constructor->getLocation(), 3131 diag::err_uninitialized_member_in_ctor) 3132 << (int)Constructor->isImplicit() 3133 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 3134 << 0 << Field->getDeclName(); 3135 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 3136 return true; 3137 } 3138 3139 if (FieldBaseElementType.isConstQualified()) { 3140 SemaRef.Diag(Constructor->getLocation(), 3141 diag::err_uninitialized_member_in_ctor) 3142 << (int)Constructor->isImplicit() 3143 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 3144 << 1 << Field->getDeclName(); 3145 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 3146 return true; 3147 } 3148 } 3149 3150 if (SemaRef.getLangOpts().ObjCAutoRefCount && 3151 FieldBaseElementType->isObjCRetainableType() && 3152 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 3153 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 3154 // ARC: 3155 // Default-initialize Objective-C pointers to NULL. 3156 CXXMemberInit 3157 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 3158 Loc, Loc, 3159 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 3160 Loc); 3161 return false; 3162 } 3163 3164 // Nothing to initialize. 3165 CXXMemberInit = 0; 3166 return false; 3167} 3168 3169namespace { 3170struct BaseAndFieldInfo { 3171 Sema &S; 3172 CXXConstructorDecl *Ctor; 3173 bool AnyErrorsInInits; 3174 ImplicitInitializerKind IIK; 3175 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 3176 SmallVector<CXXCtorInitializer*, 8> AllToInit; 3177 3178 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 3179 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 3180 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 3181 if (Generated && Ctor->isCopyConstructor()) 3182 IIK = IIK_Copy; 3183 else if (Generated && Ctor->isMoveConstructor()) 3184 IIK = IIK_Move; 3185 else if (Ctor->getInheritedConstructor()) 3186 IIK = IIK_Inherit; 3187 else 3188 IIK = IIK_Default; 3189 } 3190 3191 bool isImplicitCopyOrMove() const { 3192 switch (IIK) { 3193 case IIK_Copy: 3194 case IIK_Move: 3195 return true; 3196 3197 case IIK_Default: 3198 case IIK_Inherit: 3199 return false; 3200 } 3201 3202 llvm_unreachable("Invalid ImplicitInitializerKind!"); 3203 } 3204 3205 bool addFieldInitializer(CXXCtorInitializer *Init) { 3206 AllToInit.push_back(Init); 3207 3208 // Check whether this initializer makes the field "used". 3209 if (Init->getInit()->HasSideEffects(S.Context)) 3210 S.UnusedPrivateFields.remove(Init->getAnyMember()); 3211 3212 return false; 3213 } 3214}; 3215} 3216 3217/// \brief Determine whether the given indirect field declaration is somewhere 3218/// within an anonymous union. 3219static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 3220 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 3221 CEnd = F->chain_end(); 3222 C != CEnd; ++C) 3223 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 3224 if (Record->isUnion()) 3225 return true; 3226 3227 return false; 3228} 3229 3230/// \brief Determine whether the given type is an incomplete or zero-lenfgth 3231/// array type. 3232static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 3233 if (T->isIncompleteArrayType()) 3234 return true; 3235 3236 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 3237 if (!ArrayT->getSize()) 3238 return true; 3239 3240 T = ArrayT->getElementType(); 3241 } 3242 3243 return false; 3244} 3245 3246static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 3247 FieldDecl *Field, 3248 IndirectFieldDecl *Indirect = 0) { 3249 3250 // Overwhelmingly common case: we have a direct initializer for this field. 3251 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) 3252 return Info.addFieldInitializer(Init); 3253 3254 // C++11 [class.base.init]p8: if the entity is a non-static data member that 3255 // has a brace-or-equal-initializer, the entity is initialized as specified 3256 // in [dcl.init]. 3257 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 3258 Expr *DIE = CXXDefaultInitExpr::Create(SemaRef.Context, 3259 Info.Ctor->getLocation(), Field); 3260 CXXCtorInitializer *Init; 3261 if (Indirect) 3262 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 3263 SourceLocation(), 3264 SourceLocation(), DIE, 3265 SourceLocation()); 3266 else 3267 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 3268 SourceLocation(), 3269 SourceLocation(), DIE, 3270 SourceLocation()); 3271 return Info.addFieldInitializer(Init); 3272 } 3273 3274 // Don't build an implicit initializer for union members if none was 3275 // explicitly specified. 3276 if (Field->getParent()->isUnion() || 3277 (Indirect && isWithinAnonymousUnion(Indirect))) 3278 return false; 3279 3280 // Don't initialize incomplete or zero-length arrays. 3281 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 3282 return false; 3283 3284 // Don't try to build an implicit initializer if there were semantic 3285 // errors in any of the initializers (and therefore we might be 3286 // missing some that the user actually wrote). 3287 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 3288 return false; 3289 3290 CXXCtorInitializer *Init = 0; 3291 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 3292 Indirect, Init)) 3293 return true; 3294 3295 if (!Init) 3296 return false; 3297 3298 return Info.addFieldInitializer(Init); 3299} 3300 3301bool 3302Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 3303 CXXCtorInitializer *Initializer) { 3304 assert(Initializer->isDelegatingInitializer()); 3305 Constructor->setNumCtorInitializers(1); 3306 CXXCtorInitializer **initializer = 3307 new (Context) CXXCtorInitializer*[1]; 3308 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 3309 Constructor->setCtorInitializers(initializer); 3310 3311 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 3312 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 3313 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 3314 } 3315 3316 DelegatingCtorDecls.push_back(Constructor); 3317 3318 return false; 3319} 3320 3321bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors, 3322 ArrayRef<CXXCtorInitializer *> Initializers) { 3323 if (Constructor->isDependentContext()) { 3324 // Just store the initializers as written, they will be checked during 3325 // instantiation. 3326 if (!Initializers.empty()) { 3327 Constructor->setNumCtorInitializers(Initializers.size()); 3328 CXXCtorInitializer **baseOrMemberInitializers = 3329 new (Context) CXXCtorInitializer*[Initializers.size()]; 3330 memcpy(baseOrMemberInitializers, Initializers.data(), 3331 Initializers.size() * sizeof(CXXCtorInitializer*)); 3332 Constructor->setCtorInitializers(baseOrMemberInitializers); 3333 } 3334 3335 // Let template instantiation know whether we had errors. 3336 if (AnyErrors) 3337 Constructor->setInvalidDecl(); 3338 3339 return false; 3340 } 3341 3342 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 3343 3344 // We need to build the initializer AST according to order of construction 3345 // and not what user specified in the Initializers list. 3346 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 3347 if (!ClassDecl) 3348 return true; 3349 3350 bool HadError = false; 3351 3352 for (unsigned i = 0; i < Initializers.size(); i++) { 3353 CXXCtorInitializer *Member = Initializers[i]; 3354 3355 if (Member->isBaseInitializer()) 3356 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 3357 else 3358 Info.AllBaseFields[Member->getAnyMember()] = Member; 3359 } 3360 3361 // Keep track of the direct virtual bases. 3362 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 3363 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 3364 E = ClassDecl->bases_end(); I != E; ++I) { 3365 if (I->isVirtual()) 3366 DirectVBases.insert(I); 3367 } 3368 3369 // Push virtual bases before others. 3370 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3371 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3372 3373 if (CXXCtorInitializer *Value 3374 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 3375 Info.AllToInit.push_back(Value); 3376 } else if (!AnyErrors) { 3377 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 3378 CXXCtorInitializer *CXXBaseInit; 3379 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3380 VBase, IsInheritedVirtualBase, 3381 CXXBaseInit)) { 3382 HadError = true; 3383 continue; 3384 } 3385 3386 Info.AllToInit.push_back(CXXBaseInit); 3387 } 3388 } 3389 3390 // Non-virtual bases. 3391 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3392 E = ClassDecl->bases_end(); Base != E; ++Base) { 3393 // Virtuals are in the virtual base list and already constructed. 3394 if (Base->isVirtual()) 3395 continue; 3396 3397 if (CXXCtorInitializer *Value 3398 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3399 Info.AllToInit.push_back(Value); 3400 } else if (!AnyErrors) { 3401 CXXCtorInitializer *CXXBaseInit; 3402 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3403 Base, /*IsInheritedVirtualBase=*/false, 3404 CXXBaseInit)) { 3405 HadError = true; 3406 continue; 3407 } 3408 3409 Info.AllToInit.push_back(CXXBaseInit); 3410 } 3411 } 3412 3413 // Fields. 3414 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3415 MemEnd = ClassDecl->decls_end(); 3416 Mem != MemEnd; ++Mem) { 3417 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3418 // C++ [class.bit]p2: 3419 // A declaration for a bit-field that omits the identifier declares an 3420 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3421 // initialized. 3422 if (F->isUnnamedBitfield()) 3423 continue; 3424 3425 // If we're not generating the implicit copy/move constructor, then we'll 3426 // handle anonymous struct/union fields based on their individual 3427 // indirect fields. 3428 if (F->isAnonymousStructOrUnion() && !Info.isImplicitCopyOrMove()) 3429 continue; 3430 3431 if (CollectFieldInitializer(*this, Info, F)) 3432 HadError = true; 3433 continue; 3434 } 3435 3436 // Beyond this point, we only consider default initialization. 3437 if (Info.isImplicitCopyOrMove()) 3438 continue; 3439 3440 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3441 if (F->getType()->isIncompleteArrayType()) { 3442 assert(ClassDecl->hasFlexibleArrayMember() && 3443 "Incomplete array type is not valid"); 3444 continue; 3445 } 3446 3447 // Initialize each field of an anonymous struct individually. 3448 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3449 HadError = true; 3450 3451 continue; 3452 } 3453 } 3454 3455 unsigned NumInitializers = Info.AllToInit.size(); 3456 if (NumInitializers > 0) { 3457 Constructor->setNumCtorInitializers(NumInitializers); 3458 CXXCtorInitializer **baseOrMemberInitializers = 3459 new (Context) CXXCtorInitializer*[NumInitializers]; 3460 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3461 NumInitializers * sizeof(CXXCtorInitializer*)); 3462 Constructor->setCtorInitializers(baseOrMemberInitializers); 3463 3464 // Constructors implicitly reference the base and member 3465 // destructors. 3466 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3467 Constructor->getParent()); 3468 } 3469 3470 return HadError; 3471} 3472 3473static void PopulateKeysForFields(FieldDecl *Field, SmallVectorImpl<const void*> &IdealInits) { 3474 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3475 const RecordDecl *RD = RT->getDecl(); 3476 if (RD->isAnonymousStructOrUnion()) { 3477 for (RecordDecl::field_iterator Field = RD->field_begin(), 3478 E = RD->field_end(); Field != E; ++Field) 3479 PopulateKeysForFields(*Field, IdealInits); 3480 return; 3481 } 3482 } 3483 IdealInits.push_back(Field); 3484} 3485 3486static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3487 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3488} 3489 3490static void *GetKeyForMember(ASTContext &Context, 3491 CXXCtorInitializer *Member) { 3492 if (!Member->isAnyMemberInitializer()) 3493 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3494 3495 return Member->getAnyMember(); 3496} 3497 3498static void DiagnoseBaseOrMemInitializerOrder( 3499 Sema &SemaRef, const CXXConstructorDecl *Constructor, 3500 ArrayRef<CXXCtorInitializer *> Inits) { 3501 if (Constructor->getDeclContext()->isDependentContext()) 3502 return; 3503 3504 // Don't check initializers order unless the warning is enabled at the 3505 // location of at least one initializer. 3506 bool ShouldCheckOrder = false; 3507 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { 3508 CXXCtorInitializer *Init = Inits[InitIndex]; 3509 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3510 Init->getSourceLocation()) 3511 != DiagnosticsEngine::Ignored) { 3512 ShouldCheckOrder = true; 3513 break; 3514 } 3515 } 3516 if (!ShouldCheckOrder) 3517 return; 3518 3519 // Build the list of bases and members in the order that they'll 3520 // actually be initialized. The explicit initializers should be in 3521 // this same order but may be missing things. 3522 SmallVector<const void*, 32> IdealInitKeys; 3523 3524 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3525 3526 // 1. Virtual bases. 3527 for (CXXRecordDecl::base_class_const_iterator VBase = 3528 ClassDecl->vbases_begin(), 3529 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3530 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3531 3532 // 2. Non-virtual bases. 3533 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3534 E = ClassDecl->bases_end(); Base != E; ++Base) { 3535 if (Base->isVirtual()) 3536 continue; 3537 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3538 } 3539 3540 // 3. Direct fields. 3541 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3542 E = ClassDecl->field_end(); Field != E; ++Field) { 3543 if (Field->isUnnamedBitfield()) 3544 continue; 3545 3546 PopulateKeysForFields(*Field, IdealInitKeys); 3547 } 3548 3549 unsigned NumIdealInits = IdealInitKeys.size(); 3550 unsigned IdealIndex = 0; 3551 3552 CXXCtorInitializer *PrevInit = 0; 3553 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { 3554 CXXCtorInitializer *Init = Inits[InitIndex]; 3555 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3556 3557 // Scan forward to try to find this initializer in the idealized 3558 // initializers list. 3559 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3560 if (InitKey == IdealInitKeys[IdealIndex]) 3561 break; 3562 3563 // If we didn't find this initializer, it must be because we 3564 // scanned past it on a previous iteration. That can only 3565 // happen if we're out of order; emit a warning. 3566 if (IdealIndex == NumIdealInits && PrevInit) { 3567 Sema::SemaDiagnosticBuilder D = 3568 SemaRef.Diag(PrevInit->getSourceLocation(), 3569 diag::warn_initializer_out_of_order); 3570 3571 if (PrevInit->isAnyMemberInitializer()) 3572 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3573 else 3574 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3575 3576 if (Init->isAnyMemberInitializer()) 3577 D << 0 << Init->getAnyMember()->getDeclName(); 3578 else 3579 D << 1 << Init->getTypeSourceInfo()->getType(); 3580 3581 // Move back to the initializer's location in the ideal list. 3582 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3583 if (InitKey == IdealInitKeys[IdealIndex]) 3584 break; 3585 3586 assert(IdealIndex != NumIdealInits && 3587 "initializer not found in initializer list"); 3588 } 3589 3590 PrevInit = Init; 3591 } 3592} 3593 3594namespace { 3595bool CheckRedundantInit(Sema &S, 3596 CXXCtorInitializer *Init, 3597 CXXCtorInitializer *&PrevInit) { 3598 if (!PrevInit) { 3599 PrevInit = Init; 3600 return false; 3601 } 3602 3603 if (FieldDecl *Field = Init->getAnyMember()) 3604 S.Diag(Init->getSourceLocation(), 3605 diag::err_multiple_mem_initialization) 3606 << Field->getDeclName() 3607 << Init->getSourceRange(); 3608 else { 3609 const Type *BaseClass = Init->getBaseClass(); 3610 assert(BaseClass && "neither field nor base"); 3611 S.Diag(Init->getSourceLocation(), 3612 diag::err_multiple_base_initialization) 3613 << QualType(BaseClass, 0) 3614 << Init->getSourceRange(); 3615 } 3616 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3617 << 0 << PrevInit->getSourceRange(); 3618 3619 return true; 3620} 3621 3622typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3623typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3624 3625bool CheckRedundantUnionInit(Sema &S, 3626 CXXCtorInitializer *Init, 3627 RedundantUnionMap &Unions) { 3628 FieldDecl *Field = Init->getAnyMember(); 3629 RecordDecl *Parent = Field->getParent(); 3630 NamedDecl *Child = Field; 3631 3632 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3633 if (Parent->isUnion()) { 3634 UnionEntry &En = Unions[Parent]; 3635 if (En.first && En.first != Child) { 3636 S.Diag(Init->getSourceLocation(), 3637 diag::err_multiple_mem_union_initialization) 3638 << Field->getDeclName() 3639 << Init->getSourceRange(); 3640 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3641 << 0 << En.second->getSourceRange(); 3642 return true; 3643 } 3644 if (!En.first) { 3645 En.first = Child; 3646 En.second = Init; 3647 } 3648 if (!Parent->isAnonymousStructOrUnion()) 3649 return false; 3650 } 3651 3652 Child = Parent; 3653 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3654 } 3655 3656 return false; 3657} 3658} 3659 3660/// ActOnMemInitializers - Handle the member initializers for a constructor. 3661void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3662 SourceLocation ColonLoc, 3663 ArrayRef<CXXCtorInitializer*> MemInits, 3664 bool AnyErrors) { 3665 if (!ConstructorDecl) 3666 return; 3667 3668 AdjustDeclIfTemplate(ConstructorDecl); 3669 3670 CXXConstructorDecl *Constructor 3671 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3672 3673 if (!Constructor) { 3674 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3675 return; 3676 } 3677 3678 // Mapping for the duplicate initializers check. 3679 // For member initializers, this is keyed with a FieldDecl*. 3680 // For base initializers, this is keyed with a Type*. 3681 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3682 3683 // Mapping for the inconsistent anonymous-union initializers check. 3684 RedundantUnionMap MemberUnions; 3685 3686 bool HadError = false; 3687 for (unsigned i = 0; i < MemInits.size(); i++) { 3688 CXXCtorInitializer *Init = MemInits[i]; 3689 3690 // Set the source order index. 3691 Init->setSourceOrder(i); 3692 3693 if (Init->isAnyMemberInitializer()) { 3694 FieldDecl *Field = Init->getAnyMember(); 3695 if (CheckRedundantInit(*this, Init, Members[Field]) || 3696 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3697 HadError = true; 3698 } else if (Init->isBaseInitializer()) { 3699 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3700 if (CheckRedundantInit(*this, Init, Members[Key])) 3701 HadError = true; 3702 } else { 3703 assert(Init->isDelegatingInitializer()); 3704 // This must be the only initializer 3705 if (MemInits.size() != 1) { 3706 Diag(Init->getSourceLocation(), 3707 diag::err_delegating_initializer_alone) 3708 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange(); 3709 // We will treat this as being the only initializer. 3710 } 3711 SetDelegatingInitializer(Constructor, MemInits[i]); 3712 // Return immediately as the initializer is set. 3713 return; 3714 } 3715 } 3716 3717 if (HadError) 3718 return; 3719 3720 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits); 3721 3722 SetCtorInitializers(Constructor, AnyErrors, MemInits); 3723} 3724 3725void 3726Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3727 CXXRecordDecl *ClassDecl) { 3728 // Ignore dependent contexts. Also ignore unions, since their members never 3729 // have destructors implicitly called. 3730 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3731 return; 3732 3733 // FIXME: all the access-control diagnostics are positioned on the 3734 // field/base declaration. That's probably good; that said, the 3735 // user might reasonably want to know why the destructor is being 3736 // emitted, and we currently don't say. 3737 3738 // Non-static data members. 3739 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3740 E = ClassDecl->field_end(); I != E; ++I) { 3741 FieldDecl *Field = *I; 3742 if (Field->isInvalidDecl()) 3743 continue; 3744 3745 // Don't destroy incomplete or zero-length arrays. 3746 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3747 continue; 3748 3749 QualType FieldType = Context.getBaseElementType(Field->getType()); 3750 3751 const RecordType* RT = FieldType->getAs<RecordType>(); 3752 if (!RT) 3753 continue; 3754 3755 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3756 if (FieldClassDecl->isInvalidDecl()) 3757 continue; 3758 if (FieldClassDecl->hasIrrelevantDestructor()) 3759 continue; 3760 // The destructor for an implicit anonymous union member is never invoked. 3761 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3762 continue; 3763 3764 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3765 assert(Dtor && "No dtor found for FieldClassDecl!"); 3766 CheckDestructorAccess(Field->getLocation(), Dtor, 3767 PDiag(diag::err_access_dtor_field) 3768 << Field->getDeclName() 3769 << FieldType); 3770 3771 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3772 DiagnoseUseOfDecl(Dtor, Location); 3773 } 3774 3775 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3776 3777 // Bases. 3778 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3779 E = ClassDecl->bases_end(); Base != E; ++Base) { 3780 // Bases are always records in a well-formed non-dependent class. 3781 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3782 3783 // Remember direct virtual bases. 3784 if (Base->isVirtual()) 3785 DirectVirtualBases.insert(RT); 3786 3787 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3788 // If our base class is invalid, we probably can't get its dtor anyway. 3789 if (BaseClassDecl->isInvalidDecl()) 3790 continue; 3791 if (BaseClassDecl->hasIrrelevantDestructor()) 3792 continue; 3793 3794 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3795 assert(Dtor && "No dtor found for BaseClassDecl!"); 3796 3797 // FIXME: caret should be on the start of the class name 3798 CheckDestructorAccess(Base->getLocStart(), Dtor, 3799 PDiag(diag::err_access_dtor_base) 3800 << Base->getType() 3801 << Base->getSourceRange(), 3802 Context.getTypeDeclType(ClassDecl)); 3803 3804 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3805 DiagnoseUseOfDecl(Dtor, Location); 3806 } 3807 3808 // Virtual bases. 3809 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3810 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3811 3812 // Bases are always records in a well-formed non-dependent class. 3813 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3814 3815 // Ignore direct virtual bases. 3816 if (DirectVirtualBases.count(RT)) 3817 continue; 3818 3819 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3820 // If our base class is invalid, we probably can't get its dtor anyway. 3821 if (BaseClassDecl->isInvalidDecl()) 3822 continue; 3823 if (BaseClassDecl->hasIrrelevantDestructor()) 3824 continue; 3825 3826 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3827 assert(Dtor && "No dtor found for BaseClassDecl!"); 3828 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3829 PDiag(diag::err_access_dtor_vbase) 3830 << VBase->getType(), 3831 Context.getTypeDeclType(ClassDecl)); 3832 3833 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3834 DiagnoseUseOfDecl(Dtor, Location); 3835 } 3836} 3837 3838void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3839 if (!CDtorDecl) 3840 return; 3841 3842 if (CXXConstructorDecl *Constructor 3843 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3844 SetCtorInitializers(Constructor, /*AnyErrors=*/false); 3845} 3846 3847bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3848 unsigned DiagID, AbstractDiagSelID SelID) { 3849 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3850 unsigned DiagID; 3851 AbstractDiagSelID SelID; 3852 3853 public: 3854 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3855 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3856 3857 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 3858 if (Suppressed) return; 3859 if (SelID == -1) 3860 S.Diag(Loc, DiagID) << T; 3861 else 3862 S.Diag(Loc, DiagID) << SelID << T; 3863 } 3864 } Diagnoser(DiagID, SelID); 3865 3866 return RequireNonAbstractType(Loc, T, Diagnoser); 3867} 3868 3869bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3870 TypeDiagnoser &Diagnoser) { 3871 if (!getLangOpts().CPlusPlus) 3872 return false; 3873 3874 if (const ArrayType *AT = Context.getAsArrayType(T)) 3875 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3876 3877 if (const PointerType *PT = T->getAs<PointerType>()) { 3878 // Find the innermost pointer type. 3879 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3880 PT = T; 3881 3882 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3883 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3884 } 3885 3886 const RecordType *RT = T->getAs<RecordType>(); 3887 if (!RT) 3888 return false; 3889 3890 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3891 3892 // We can't answer whether something is abstract until it has a 3893 // definition. If it's currently being defined, we'll walk back 3894 // over all the declarations when we have a full definition. 3895 const CXXRecordDecl *Def = RD->getDefinition(); 3896 if (!Def || Def->isBeingDefined()) 3897 return false; 3898 3899 if (!RD->isAbstract()) 3900 return false; 3901 3902 Diagnoser.diagnose(*this, Loc, T); 3903 DiagnoseAbstractType(RD); 3904 3905 return true; 3906} 3907 3908void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3909 // Check if we've already emitted the list of pure virtual functions 3910 // for this class. 3911 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3912 return; 3913 3914 CXXFinalOverriderMap FinalOverriders; 3915 RD->getFinalOverriders(FinalOverriders); 3916 3917 // Keep a set of seen pure methods so we won't diagnose the same method 3918 // more than once. 3919 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3920 3921 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3922 MEnd = FinalOverriders.end(); 3923 M != MEnd; 3924 ++M) { 3925 for (OverridingMethods::iterator SO = M->second.begin(), 3926 SOEnd = M->second.end(); 3927 SO != SOEnd; ++SO) { 3928 // C++ [class.abstract]p4: 3929 // A class is abstract if it contains or inherits at least one 3930 // pure virtual function for which the final overrider is pure 3931 // virtual. 3932 3933 // 3934 if (SO->second.size() != 1) 3935 continue; 3936 3937 if (!SO->second.front().Method->isPure()) 3938 continue; 3939 3940 if (!SeenPureMethods.insert(SO->second.front().Method)) 3941 continue; 3942 3943 Diag(SO->second.front().Method->getLocation(), 3944 diag::note_pure_virtual_function) 3945 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3946 } 3947 } 3948 3949 if (!PureVirtualClassDiagSet) 3950 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3951 PureVirtualClassDiagSet->insert(RD); 3952} 3953 3954namespace { 3955struct AbstractUsageInfo { 3956 Sema &S; 3957 CXXRecordDecl *Record; 3958 CanQualType AbstractType; 3959 bool Invalid; 3960 3961 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3962 : S(S), Record(Record), 3963 AbstractType(S.Context.getCanonicalType( 3964 S.Context.getTypeDeclType(Record))), 3965 Invalid(false) {} 3966 3967 void DiagnoseAbstractType() { 3968 if (Invalid) return; 3969 S.DiagnoseAbstractType(Record); 3970 Invalid = true; 3971 } 3972 3973 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3974}; 3975 3976struct CheckAbstractUsage { 3977 AbstractUsageInfo &Info; 3978 const NamedDecl *Ctx; 3979 3980 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3981 : Info(Info), Ctx(Ctx) {} 3982 3983 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3984 switch (TL.getTypeLocClass()) { 3985#define ABSTRACT_TYPELOC(CLASS, PARENT) 3986#define TYPELOC(CLASS, PARENT) \ 3987 case TypeLoc::CLASS: Check(TL.castAs<CLASS##TypeLoc>(), Sel); break; 3988#include "clang/AST/TypeLocNodes.def" 3989 } 3990 } 3991 3992 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3993 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3994 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3995 if (!TL.getArg(I)) 3996 continue; 3997 3998 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3999 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 4000 } 4001 } 4002 4003 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 4004 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 4005 } 4006 4007 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 4008 // Visit the type parameters from a permissive context. 4009 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 4010 TemplateArgumentLoc TAL = TL.getArgLoc(I); 4011 if (TAL.getArgument().getKind() == TemplateArgument::Type) 4012 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 4013 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 4014 // TODO: other template argument types? 4015 } 4016 } 4017 4018 // Visit pointee types from a permissive context. 4019#define CheckPolymorphic(Type) \ 4020 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 4021 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 4022 } 4023 CheckPolymorphic(PointerTypeLoc) 4024 CheckPolymorphic(ReferenceTypeLoc) 4025 CheckPolymorphic(MemberPointerTypeLoc) 4026 CheckPolymorphic(BlockPointerTypeLoc) 4027 CheckPolymorphic(AtomicTypeLoc) 4028 4029 /// Handle all the types we haven't given a more specific 4030 /// implementation for above. 4031 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 4032 // Every other kind of type that we haven't called out already 4033 // that has an inner type is either (1) sugar or (2) contains that 4034 // inner type in some way as a subobject. 4035 if (TypeLoc Next = TL.getNextTypeLoc()) 4036 return Visit(Next, Sel); 4037 4038 // If there's no inner type and we're in a permissive context, 4039 // don't diagnose. 4040 if (Sel == Sema::AbstractNone) return; 4041 4042 // Check whether the type matches the abstract type. 4043 QualType T = TL.getType(); 4044 if (T->isArrayType()) { 4045 Sel = Sema::AbstractArrayType; 4046 T = Info.S.Context.getBaseElementType(T); 4047 } 4048 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 4049 if (CT != Info.AbstractType) return; 4050 4051 // It matched; do some magic. 4052 if (Sel == Sema::AbstractArrayType) { 4053 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 4054 << T << TL.getSourceRange(); 4055 } else { 4056 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 4057 << Sel << T << TL.getSourceRange(); 4058 } 4059 Info.DiagnoseAbstractType(); 4060 } 4061}; 4062 4063void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 4064 Sema::AbstractDiagSelID Sel) { 4065 CheckAbstractUsage(*this, D).Visit(TL, Sel); 4066} 4067 4068} 4069 4070/// Check for invalid uses of an abstract type in a method declaration. 4071static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 4072 CXXMethodDecl *MD) { 4073 // No need to do the check on definitions, which require that 4074 // the return/param types be complete. 4075 if (MD->doesThisDeclarationHaveABody()) 4076 return; 4077 4078 // For safety's sake, just ignore it if we don't have type source 4079 // information. This should never happen for non-implicit methods, 4080 // but... 4081 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 4082 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 4083} 4084 4085/// Check for invalid uses of an abstract type within a class definition. 4086static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 4087 CXXRecordDecl *RD) { 4088 for (CXXRecordDecl::decl_iterator 4089 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 4090 Decl *D = *I; 4091 if (D->isImplicit()) continue; 4092 4093 // Methods and method templates. 4094 if (isa<CXXMethodDecl>(D)) { 4095 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 4096 } else if (isa<FunctionTemplateDecl>(D)) { 4097 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 4098 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 4099 4100 // Fields and static variables. 4101 } else if (isa<FieldDecl>(D)) { 4102 FieldDecl *FD = cast<FieldDecl>(D); 4103 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 4104 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 4105 } else if (isa<VarDecl>(D)) { 4106 VarDecl *VD = cast<VarDecl>(D); 4107 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 4108 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 4109 4110 // Nested classes and class templates. 4111 } else if (isa<CXXRecordDecl>(D)) { 4112 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 4113 } else if (isa<ClassTemplateDecl>(D)) { 4114 CheckAbstractClassUsage(Info, 4115 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 4116 } 4117 } 4118} 4119 4120/// \brief Perform semantic checks on a class definition that has been 4121/// completing, introducing implicitly-declared members, checking for 4122/// abstract types, etc. 4123void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 4124 if (!Record) 4125 return; 4126 4127 if (Record->isAbstract() && !Record->isInvalidDecl()) { 4128 AbstractUsageInfo Info(*this, Record); 4129 CheckAbstractClassUsage(Info, Record); 4130 } 4131 4132 // If this is not an aggregate type and has no user-declared constructor, 4133 // complain about any non-static data members of reference or const scalar 4134 // type, since they will never get initializers. 4135 if (!Record->isInvalidDecl() && !Record->isDependentType() && 4136 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 4137 !Record->isLambda()) { 4138 bool Complained = false; 4139 for (RecordDecl::field_iterator F = Record->field_begin(), 4140 FEnd = Record->field_end(); 4141 F != FEnd; ++F) { 4142 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 4143 continue; 4144 4145 if (F->getType()->isReferenceType() || 4146 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 4147 if (!Complained) { 4148 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 4149 << Record->getTagKind() << Record; 4150 Complained = true; 4151 } 4152 4153 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 4154 << F->getType()->isReferenceType() 4155 << F->getDeclName(); 4156 } 4157 } 4158 } 4159 4160 if (Record->isDynamicClass() && !Record->isDependentType()) 4161 DynamicClasses.push_back(Record); 4162 4163 if (Record->getIdentifier()) { 4164 // C++ [class.mem]p13: 4165 // If T is the name of a class, then each of the following shall have a 4166 // name different from T: 4167 // - every member of every anonymous union that is a member of class T. 4168 // 4169 // C++ [class.mem]p14: 4170 // In addition, if class T has a user-declared constructor (12.1), every 4171 // non-static data member of class T shall have a name different from T. 4172 DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 4173 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 4174 ++I) { 4175 NamedDecl *D = *I; 4176 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 4177 isa<IndirectFieldDecl>(D)) { 4178 Diag(D->getLocation(), diag::err_member_name_of_class) 4179 << D->getDeclName(); 4180 break; 4181 } 4182 } 4183 } 4184 4185 // Warn if the class has virtual methods but non-virtual public destructor. 4186 if (Record->isPolymorphic() && !Record->isDependentType()) { 4187 CXXDestructorDecl *dtor = Record->getDestructor(); 4188 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 4189 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 4190 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 4191 } 4192 4193 if (Record->isAbstract() && Record->hasAttr<FinalAttr>()) { 4194 Diag(Record->getLocation(), diag::warn_abstract_final_class); 4195 DiagnoseAbstractType(Record); 4196 } 4197 4198 if (!Record->isDependentType()) { 4199 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 4200 MEnd = Record->method_end(); 4201 M != MEnd; ++M) { 4202 // See if a method overloads virtual methods in a base 4203 // class without overriding any. 4204 if (!M->isStatic()) 4205 DiagnoseHiddenVirtualMethods(Record, *M); 4206 4207 // Check whether the explicitly-defaulted special members are valid. 4208 if (!M->isInvalidDecl() && M->isExplicitlyDefaulted()) 4209 CheckExplicitlyDefaultedSpecialMember(*M); 4210 4211 // For an explicitly defaulted or deleted special member, we defer 4212 // determining triviality until the class is complete. That time is now! 4213 if (!M->isImplicit() && !M->isUserProvided()) { 4214 CXXSpecialMember CSM = getSpecialMember(*M); 4215 if (CSM != CXXInvalid) { 4216 M->setTrivial(SpecialMemberIsTrivial(*M, CSM)); 4217 4218 // Inform the class that we've finished declaring this member. 4219 Record->finishedDefaultedOrDeletedMember(*M); 4220 } 4221 } 4222 } 4223 } 4224 4225 // C++11 [dcl.constexpr]p8: A constexpr specifier for a non-static member 4226 // function that is not a constructor declares that member function to be 4227 // const. [...] The class of which that function is a member shall be 4228 // a literal type. 4229 // 4230 // If the class has virtual bases, any constexpr members will already have 4231 // been diagnosed by the checks performed on the member declaration, so 4232 // suppress this (less useful) diagnostic. 4233 // 4234 // We delay this until we know whether an explicitly-defaulted (or deleted) 4235 // destructor for the class is trivial. 4236 if (LangOpts.CPlusPlus11 && !Record->isDependentType() && 4237 !Record->isLiteral() && !Record->getNumVBases()) { 4238 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 4239 MEnd = Record->method_end(); 4240 M != MEnd; ++M) { 4241 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 4242 switch (Record->getTemplateSpecializationKind()) { 4243 case TSK_ImplicitInstantiation: 4244 case TSK_ExplicitInstantiationDeclaration: 4245 case TSK_ExplicitInstantiationDefinition: 4246 // If a template instantiates to a non-literal type, but its members 4247 // instantiate to constexpr functions, the template is technically 4248 // ill-formed, but we allow it for sanity. 4249 continue; 4250 4251 case TSK_Undeclared: 4252 case TSK_ExplicitSpecialization: 4253 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 4254 diag::err_constexpr_method_non_literal); 4255 break; 4256 } 4257 4258 // Only produce one error per class. 4259 break; 4260 } 4261 } 4262 } 4263 4264 // Declare inheriting constructors. We do this eagerly here because: 4265 // - The standard requires an eager diagnostic for conflicting inheriting 4266 // constructors from different classes. 4267 // - The lazy declaration of the other implicit constructors is so as to not 4268 // waste space and performance on classes that are not meant to be 4269 // instantiated (e.g. meta-functions). This doesn't apply to classes that 4270 // have inheriting constructors. 4271 DeclareInheritingConstructors(Record); 4272} 4273 4274/// Is the special member function which would be selected to perform the 4275/// specified operation on the specified class type a constexpr constructor? 4276static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4277 Sema::CXXSpecialMember CSM, 4278 bool ConstArg) { 4279 Sema::SpecialMemberOverloadResult *SMOR = 4280 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 4281 false, false, false, false); 4282 if (!SMOR || !SMOR->getMethod()) 4283 // A constructor we wouldn't select can't be "involved in initializing" 4284 // anything. 4285 return true; 4286 return SMOR->getMethod()->isConstexpr(); 4287} 4288 4289/// Determine whether the specified special member function would be constexpr 4290/// if it were implicitly defined. 4291static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4292 Sema::CXXSpecialMember CSM, 4293 bool ConstArg) { 4294 if (!S.getLangOpts().CPlusPlus11) 4295 return false; 4296 4297 // C++11 [dcl.constexpr]p4: 4298 // In the definition of a constexpr constructor [...] 4299 switch (CSM) { 4300 case Sema::CXXDefaultConstructor: 4301 // Since default constructor lookup is essentially trivial (and cannot 4302 // involve, for instance, template instantiation), we compute whether a 4303 // defaulted default constructor is constexpr directly within CXXRecordDecl. 4304 // 4305 // This is important for performance; we need to know whether the default 4306 // constructor is constexpr to determine whether the type is a literal type. 4307 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 4308 4309 case Sema::CXXCopyConstructor: 4310 case Sema::CXXMoveConstructor: 4311 // For copy or move constructors, we need to perform overload resolution. 4312 break; 4313 4314 case Sema::CXXCopyAssignment: 4315 case Sema::CXXMoveAssignment: 4316 case Sema::CXXDestructor: 4317 case Sema::CXXInvalid: 4318 return false; 4319 } 4320 4321 // -- if the class is a non-empty union, or for each non-empty anonymous 4322 // union member of a non-union class, exactly one non-static data member 4323 // shall be initialized; [DR1359] 4324 // 4325 // If we squint, this is guaranteed, since exactly one non-static data member 4326 // will be initialized (if the constructor isn't deleted), we just don't know 4327 // which one. 4328 if (ClassDecl->isUnion()) 4329 return true; 4330 4331 // -- the class shall not have any virtual base classes; 4332 if (ClassDecl->getNumVBases()) 4333 return false; 4334 4335 // -- every constructor involved in initializing [...] base class 4336 // sub-objects shall be a constexpr constructor; 4337 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4338 BEnd = ClassDecl->bases_end(); 4339 B != BEnd; ++B) { 4340 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 4341 if (!BaseType) continue; 4342 4343 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4344 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 4345 return false; 4346 } 4347 4348 // -- every constructor involved in initializing non-static data members 4349 // [...] shall be a constexpr constructor; 4350 // -- every non-static data member and base class sub-object shall be 4351 // initialized 4352 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4353 FEnd = ClassDecl->field_end(); 4354 F != FEnd; ++F) { 4355 if (F->isInvalidDecl()) 4356 continue; 4357 if (const RecordType *RecordTy = 4358 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4359 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4360 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 4361 return false; 4362 } 4363 } 4364 4365 // All OK, it's constexpr! 4366 return true; 4367} 4368 4369static Sema::ImplicitExceptionSpecification 4370computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 4371 switch (S.getSpecialMember(MD)) { 4372 case Sema::CXXDefaultConstructor: 4373 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 4374 case Sema::CXXCopyConstructor: 4375 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 4376 case Sema::CXXCopyAssignment: 4377 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 4378 case Sema::CXXMoveConstructor: 4379 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 4380 case Sema::CXXMoveAssignment: 4381 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 4382 case Sema::CXXDestructor: 4383 return S.ComputeDefaultedDtorExceptionSpec(MD); 4384 case Sema::CXXInvalid: 4385 break; 4386 } 4387 assert(cast<CXXConstructorDecl>(MD)->getInheritedConstructor() && 4388 "only special members have implicit exception specs"); 4389 return S.ComputeInheritingCtorExceptionSpec(cast<CXXConstructorDecl>(MD)); 4390} 4391 4392static void 4393updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4394 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4395 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4396 ExceptSpec.getEPI(EPI); 4397 FD->setType(S.Context.getFunctionType(FPT->getResultType(), 4398 FPT->getArgTypes(), EPI)); 4399} 4400 4401void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4402 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4403 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4404 return; 4405 4406 // Evaluate the exception specification. 4407 ImplicitExceptionSpecification ExceptSpec = 4408 computeImplicitExceptionSpec(*this, Loc, MD); 4409 4410 // Update the type of the special member to use it. 4411 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4412 4413 // A user-provided destructor can be defined outside the class. When that 4414 // happens, be sure to update the exception specification on both 4415 // declarations. 4416 const FunctionProtoType *CanonicalFPT = 4417 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4418 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4419 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4420 CanonicalFPT, ExceptSpec); 4421} 4422 4423void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4424 CXXRecordDecl *RD = MD->getParent(); 4425 CXXSpecialMember CSM = getSpecialMember(MD); 4426 4427 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4428 "not an explicitly-defaulted special member"); 4429 4430 // Whether this was the first-declared instance of the constructor. 4431 // This affects whether we implicitly add an exception spec and constexpr. 4432 bool First = MD == MD->getCanonicalDecl(); 4433 4434 bool HadError = false; 4435 4436 // C++11 [dcl.fct.def.default]p1: 4437 // A function that is explicitly defaulted shall 4438 // -- be a special member function (checked elsewhere), 4439 // -- have the same type (except for ref-qualifiers, and except that a 4440 // copy operation can take a non-const reference) as an implicit 4441 // declaration, and 4442 // -- not have default arguments. 4443 unsigned ExpectedParams = 1; 4444 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4445 ExpectedParams = 0; 4446 if (MD->getNumParams() != ExpectedParams) { 4447 // This also checks for default arguments: a copy or move constructor with a 4448 // default argument is classified as a default constructor, and assignment 4449 // operations and destructors can't have default arguments. 4450 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4451 << CSM << MD->getSourceRange(); 4452 HadError = true; 4453 } else if (MD->isVariadic()) { 4454 Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic) 4455 << CSM << MD->getSourceRange(); 4456 HadError = true; 4457 } 4458 4459 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4460 4461 bool CanHaveConstParam = false; 4462 if (CSM == CXXCopyConstructor) 4463 CanHaveConstParam = RD->implicitCopyConstructorHasConstParam(); 4464 else if (CSM == CXXCopyAssignment) 4465 CanHaveConstParam = RD->implicitCopyAssignmentHasConstParam(); 4466 4467 QualType ReturnType = Context.VoidTy; 4468 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4469 // Check for return type matching. 4470 ReturnType = Type->getResultType(); 4471 QualType ExpectedReturnType = 4472 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4473 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4474 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4475 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4476 HadError = true; 4477 } 4478 4479 // A defaulted special member cannot have cv-qualifiers. 4480 if (Type->getTypeQuals()) { 4481 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4482 << (CSM == CXXMoveAssignment); 4483 HadError = true; 4484 } 4485 } 4486 4487 // Check for parameter type matching. 4488 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4489 bool HasConstParam = false; 4490 if (ExpectedParams && ArgType->isReferenceType()) { 4491 // Argument must be reference to possibly-const T. 4492 QualType ReferentType = ArgType->getPointeeType(); 4493 HasConstParam = ReferentType.isConstQualified(); 4494 4495 if (ReferentType.isVolatileQualified()) { 4496 Diag(MD->getLocation(), 4497 diag::err_defaulted_special_member_volatile_param) << CSM; 4498 HadError = true; 4499 } 4500 4501 if (HasConstParam && !CanHaveConstParam) { 4502 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4503 Diag(MD->getLocation(), 4504 diag::err_defaulted_special_member_copy_const_param) 4505 << (CSM == CXXCopyAssignment); 4506 // FIXME: Explain why this special member can't be const. 4507 } else { 4508 Diag(MD->getLocation(), 4509 diag::err_defaulted_special_member_move_const_param) 4510 << (CSM == CXXMoveAssignment); 4511 } 4512 HadError = true; 4513 } 4514 } else if (ExpectedParams) { 4515 // A copy assignment operator can take its argument by value, but a 4516 // defaulted one cannot. 4517 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4518 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4519 HadError = true; 4520 } 4521 4522 // C++11 [dcl.fct.def.default]p2: 4523 // An explicitly-defaulted function may be declared constexpr only if it 4524 // would have been implicitly declared as constexpr, 4525 // Do not apply this rule to members of class templates, since core issue 1358 4526 // makes such functions always instantiate to constexpr functions. For 4527 // non-constructors, this is checked elsewhere. 4528 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4529 HasConstParam); 4530 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr && 4531 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4532 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4533 // FIXME: Explain why the constructor can't be constexpr. 4534 HadError = true; 4535 } 4536 4537 // and may have an explicit exception-specification only if it is compatible 4538 // with the exception-specification on the implicit declaration. 4539 if (Type->hasExceptionSpec()) { 4540 // Delay the check if this is the first declaration of the special member, 4541 // since we may not have parsed some necessary in-class initializers yet. 4542 if (First) { 4543 // If the exception specification needs to be instantiated, do so now, 4544 // before we clobber it with an EST_Unevaluated specification below. 4545 if (Type->getExceptionSpecType() == EST_Uninstantiated) { 4546 InstantiateExceptionSpec(MD->getLocStart(), MD); 4547 Type = MD->getType()->getAs<FunctionProtoType>(); 4548 } 4549 DelayedDefaultedMemberExceptionSpecs.push_back(std::make_pair(MD, Type)); 4550 } else 4551 CheckExplicitlyDefaultedMemberExceptionSpec(MD, Type); 4552 } 4553 4554 // If a function is explicitly defaulted on its first declaration, 4555 if (First) { 4556 // -- it is implicitly considered to be constexpr if the implicit 4557 // definition would be, 4558 MD->setConstexpr(Constexpr); 4559 4560 // -- it is implicitly considered to have the same exception-specification 4561 // as if it had been implicitly declared, 4562 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4563 EPI.ExceptionSpecType = EST_Unevaluated; 4564 EPI.ExceptionSpecDecl = MD; 4565 MD->setType(Context.getFunctionType(ReturnType, 4566 ArrayRef<QualType>(&ArgType, 4567 ExpectedParams), 4568 EPI)); 4569 } 4570 4571 if (ShouldDeleteSpecialMember(MD, CSM)) { 4572 if (First) { 4573 SetDeclDeleted(MD, MD->getLocation()); 4574 } else { 4575 // C++11 [dcl.fct.def.default]p4: 4576 // [For a] user-provided explicitly-defaulted function [...] if such a 4577 // function is implicitly defined as deleted, the program is ill-formed. 4578 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4579 HadError = true; 4580 } 4581 } 4582 4583 if (HadError) 4584 MD->setInvalidDecl(); 4585} 4586 4587/// Check whether the exception specification provided for an 4588/// explicitly-defaulted special member matches the exception specification 4589/// that would have been generated for an implicit special member, per 4590/// C++11 [dcl.fct.def.default]p2. 4591void Sema::CheckExplicitlyDefaultedMemberExceptionSpec( 4592 CXXMethodDecl *MD, const FunctionProtoType *SpecifiedType) { 4593 // Compute the implicit exception specification. 4594 FunctionProtoType::ExtProtoInfo EPI; 4595 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4596 const FunctionProtoType *ImplicitType = cast<FunctionProtoType>( 4597 Context.getFunctionType(Context.VoidTy, ArrayRef<QualType>(), EPI)); 4598 4599 // Ensure that it matches. 4600 CheckEquivalentExceptionSpec( 4601 PDiag(diag::err_incorrect_defaulted_exception_spec) 4602 << getSpecialMember(MD), PDiag(), 4603 ImplicitType, SourceLocation(), 4604 SpecifiedType, MD->getLocation()); 4605} 4606 4607void Sema::CheckDelayedExplicitlyDefaultedMemberExceptionSpecs() { 4608 for (unsigned I = 0, N = DelayedDefaultedMemberExceptionSpecs.size(); 4609 I != N; ++I) 4610 CheckExplicitlyDefaultedMemberExceptionSpec( 4611 DelayedDefaultedMemberExceptionSpecs[I].first, 4612 DelayedDefaultedMemberExceptionSpecs[I].second); 4613 4614 DelayedDefaultedMemberExceptionSpecs.clear(); 4615} 4616 4617namespace { 4618struct SpecialMemberDeletionInfo { 4619 Sema &S; 4620 CXXMethodDecl *MD; 4621 Sema::CXXSpecialMember CSM; 4622 bool Diagnose; 4623 4624 // Properties of the special member, computed for convenience. 4625 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4626 SourceLocation Loc; 4627 4628 bool AllFieldsAreConst; 4629 4630 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4631 Sema::CXXSpecialMember CSM, bool Diagnose) 4632 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4633 IsConstructor(false), IsAssignment(false), IsMove(false), 4634 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4635 AllFieldsAreConst(true) { 4636 switch (CSM) { 4637 case Sema::CXXDefaultConstructor: 4638 case Sema::CXXCopyConstructor: 4639 IsConstructor = true; 4640 break; 4641 case Sema::CXXMoveConstructor: 4642 IsConstructor = true; 4643 IsMove = true; 4644 break; 4645 case Sema::CXXCopyAssignment: 4646 IsAssignment = true; 4647 break; 4648 case Sema::CXXMoveAssignment: 4649 IsAssignment = true; 4650 IsMove = true; 4651 break; 4652 case Sema::CXXDestructor: 4653 break; 4654 case Sema::CXXInvalid: 4655 llvm_unreachable("invalid special member kind"); 4656 } 4657 4658 if (MD->getNumParams()) { 4659 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4660 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4661 } 4662 } 4663 4664 bool inUnion() const { return MD->getParent()->isUnion(); } 4665 4666 /// Look up the corresponding special member in the given class. 4667 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4668 unsigned Quals) { 4669 unsigned TQ = MD->getTypeQualifiers(); 4670 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4671 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4672 Quals = 0; 4673 return S.LookupSpecialMember(Class, CSM, 4674 ConstArg || (Quals & Qualifiers::Const), 4675 VolatileArg || (Quals & Qualifiers::Volatile), 4676 MD->getRefQualifier() == RQ_RValue, 4677 TQ & Qualifiers::Const, 4678 TQ & Qualifiers::Volatile); 4679 } 4680 4681 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4682 4683 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4684 bool shouldDeleteForField(FieldDecl *FD); 4685 bool shouldDeleteForAllConstMembers(); 4686 4687 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4688 unsigned Quals); 4689 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4690 Sema::SpecialMemberOverloadResult *SMOR, 4691 bool IsDtorCallInCtor); 4692 4693 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4694}; 4695} 4696 4697/// Is the given special member inaccessible when used on the given 4698/// sub-object. 4699bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4700 CXXMethodDecl *target) { 4701 /// If we're operating on a base class, the object type is the 4702 /// type of this special member. 4703 QualType objectTy; 4704 AccessSpecifier access = target->getAccess(); 4705 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4706 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4707 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4708 4709 // If we're operating on a field, the object type is the type of the field. 4710 } else { 4711 objectTy = S.Context.getTypeDeclType(target->getParent()); 4712 } 4713 4714 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4715} 4716 4717/// Check whether we should delete a special member due to the implicit 4718/// definition containing a call to a special member of a subobject. 4719bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4720 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4721 bool IsDtorCallInCtor) { 4722 CXXMethodDecl *Decl = SMOR->getMethod(); 4723 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4724 4725 int DiagKind = -1; 4726 4727 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4728 DiagKind = !Decl ? 0 : 1; 4729 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4730 DiagKind = 2; 4731 else if (!isAccessible(Subobj, Decl)) 4732 DiagKind = 3; 4733 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4734 !Decl->isTrivial()) { 4735 // A member of a union must have a trivial corresponding special member. 4736 // As a weird special case, a destructor call from a union's constructor 4737 // must be accessible and non-deleted, but need not be trivial. Such a 4738 // destructor is never actually called, but is semantically checked as 4739 // if it were. 4740 DiagKind = 4; 4741 } 4742 4743 if (DiagKind == -1) 4744 return false; 4745 4746 if (Diagnose) { 4747 if (Field) { 4748 S.Diag(Field->getLocation(), 4749 diag::note_deleted_special_member_class_subobject) 4750 << CSM << MD->getParent() << /*IsField*/true 4751 << Field << DiagKind << IsDtorCallInCtor; 4752 } else { 4753 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4754 S.Diag(Base->getLocStart(), 4755 diag::note_deleted_special_member_class_subobject) 4756 << CSM << MD->getParent() << /*IsField*/false 4757 << Base->getType() << DiagKind << IsDtorCallInCtor; 4758 } 4759 4760 if (DiagKind == 1) 4761 S.NoteDeletedFunction(Decl); 4762 // FIXME: Explain inaccessibility if DiagKind == 3. 4763 } 4764 4765 return true; 4766} 4767 4768/// Check whether we should delete a special member function due to having a 4769/// direct or virtual base class or non-static data member of class type M. 4770bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4771 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 4772 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4773 4774 // C++11 [class.ctor]p5: 4775 // -- any direct or virtual base class, or non-static data member with no 4776 // brace-or-equal-initializer, has class type M (or array thereof) and 4777 // either M has no default constructor or overload resolution as applied 4778 // to M's default constructor results in an ambiguity or in a function 4779 // that is deleted or inaccessible 4780 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4781 // -- a direct or virtual base class B that cannot be copied/moved because 4782 // overload resolution, as applied to B's corresponding special member, 4783 // results in an ambiguity or a function that is deleted or inaccessible 4784 // from the defaulted special member 4785 // C++11 [class.dtor]p5: 4786 // -- any direct or virtual base class [...] has a type with a destructor 4787 // that is deleted or inaccessible 4788 if (!(CSM == Sema::CXXDefaultConstructor && 4789 Field && Field->hasInClassInitializer()) && 4790 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 4791 return true; 4792 4793 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4794 // -- any direct or virtual base class or non-static data member has a 4795 // type with a destructor that is deleted or inaccessible 4796 if (IsConstructor) { 4797 Sema::SpecialMemberOverloadResult *SMOR = 4798 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4799 false, false, false, false, false); 4800 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4801 return true; 4802 } 4803 4804 return false; 4805} 4806 4807/// Check whether we should delete a special member function due to the class 4808/// having a particular direct or virtual base class. 4809bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4810 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4811 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 4812} 4813 4814/// Check whether we should delete a special member function due to the class 4815/// having a particular non-static data member. 4816bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4817 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4818 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4819 4820 if (CSM == Sema::CXXDefaultConstructor) { 4821 // For a default constructor, all references must be initialized in-class 4822 // and, if a union, it must have a non-const member. 4823 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4824 if (Diagnose) 4825 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4826 << MD->getParent() << FD << FieldType << /*Reference*/0; 4827 return true; 4828 } 4829 // C++11 [class.ctor]p5: any non-variant non-static data member of 4830 // const-qualified type (or array thereof) with no 4831 // brace-or-equal-initializer does not have a user-provided default 4832 // constructor. 4833 if (!inUnion() && FieldType.isConstQualified() && 4834 !FD->hasInClassInitializer() && 4835 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4836 if (Diagnose) 4837 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4838 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4839 return true; 4840 } 4841 4842 if (inUnion() && !FieldType.isConstQualified()) 4843 AllFieldsAreConst = false; 4844 } else if (CSM == Sema::CXXCopyConstructor) { 4845 // For a copy constructor, data members must not be of rvalue reference 4846 // type. 4847 if (FieldType->isRValueReferenceType()) { 4848 if (Diagnose) 4849 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4850 << MD->getParent() << FD << FieldType; 4851 return true; 4852 } 4853 } else if (IsAssignment) { 4854 // For an assignment operator, data members must not be of reference type. 4855 if (FieldType->isReferenceType()) { 4856 if (Diagnose) 4857 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4858 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4859 return true; 4860 } 4861 if (!FieldRecord && FieldType.isConstQualified()) { 4862 // C++11 [class.copy]p23: 4863 // -- a non-static data member of const non-class type (or array thereof) 4864 if (Diagnose) 4865 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4866 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4867 return true; 4868 } 4869 } 4870 4871 if (FieldRecord) { 4872 // Some additional restrictions exist on the variant members. 4873 if (!inUnion() && FieldRecord->isUnion() && 4874 FieldRecord->isAnonymousStructOrUnion()) { 4875 bool AllVariantFieldsAreConst = true; 4876 4877 // FIXME: Handle anonymous unions declared within anonymous unions. 4878 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4879 UE = FieldRecord->field_end(); 4880 UI != UE; ++UI) { 4881 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4882 4883 if (!UnionFieldType.isConstQualified()) 4884 AllVariantFieldsAreConst = false; 4885 4886 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4887 if (UnionFieldRecord && 4888 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 4889 UnionFieldType.getCVRQualifiers())) 4890 return true; 4891 } 4892 4893 // At least one member in each anonymous union must be non-const 4894 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4895 FieldRecord->field_begin() != FieldRecord->field_end()) { 4896 if (Diagnose) 4897 S.Diag(FieldRecord->getLocation(), 4898 diag::note_deleted_default_ctor_all_const) 4899 << MD->getParent() << /*anonymous union*/1; 4900 return true; 4901 } 4902 4903 // Don't check the implicit member of the anonymous union type. 4904 // This is technically non-conformant, but sanity demands it. 4905 return false; 4906 } 4907 4908 if (shouldDeleteForClassSubobject(FieldRecord, FD, 4909 FieldType.getCVRQualifiers())) 4910 return true; 4911 } 4912 4913 return false; 4914} 4915 4916/// C++11 [class.ctor] p5: 4917/// A defaulted default constructor for a class X is defined as deleted if 4918/// X is a union and all of its variant members are of const-qualified type. 4919bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4920 // This is a silly definition, because it gives an empty union a deleted 4921 // default constructor. Don't do that. 4922 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4923 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4924 if (Diagnose) 4925 S.Diag(MD->getParent()->getLocation(), 4926 diag::note_deleted_default_ctor_all_const) 4927 << MD->getParent() << /*not anonymous union*/0; 4928 return true; 4929 } 4930 return false; 4931} 4932 4933/// Determine whether a defaulted special member function should be defined as 4934/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4935/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4936bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4937 bool Diagnose) { 4938 if (MD->isInvalidDecl()) 4939 return false; 4940 CXXRecordDecl *RD = MD->getParent(); 4941 assert(!RD->isDependentType() && "do deletion after instantiation"); 4942 if (!LangOpts.CPlusPlus11 || RD->isInvalidDecl()) 4943 return false; 4944 4945 // C++11 [expr.lambda.prim]p19: 4946 // The closure type associated with a lambda-expression has a 4947 // deleted (8.4.3) default constructor and a deleted copy 4948 // assignment operator. 4949 if (RD->isLambda() && 4950 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4951 if (Diagnose) 4952 Diag(RD->getLocation(), diag::note_lambda_decl); 4953 return true; 4954 } 4955 4956 // For an anonymous struct or union, the copy and assignment special members 4957 // will never be used, so skip the check. For an anonymous union declared at 4958 // namespace scope, the constructor and destructor are used. 4959 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4960 RD->isAnonymousStructOrUnion()) 4961 return false; 4962 4963 // C++11 [class.copy]p7, p18: 4964 // If the class definition declares a move constructor or move assignment 4965 // operator, an implicitly declared copy constructor or copy assignment 4966 // operator is defined as deleted. 4967 if (MD->isImplicit() && 4968 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4969 CXXMethodDecl *UserDeclaredMove = 0; 4970 4971 // In Microsoft mode, a user-declared move only causes the deletion of the 4972 // corresponding copy operation, not both copy operations. 4973 if (RD->hasUserDeclaredMoveConstructor() && 4974 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4975 if (!Diagnose) return true; 4976 4977 // Find any user-declared move constructor. 4978 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(), 4979 E = RD->ctor_end(); I != E; ++I) { 4980 if (I->isMoveConstructor()) { 4981 UserDeclaredMove = *I; 4982 break; 4983 } 4984 } 4985 assert(UserDeclaredMove); 4986 } else if (RD->hasUserDeclaredMoveAssignment() && 4987 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4988 if (!Diagnose) return true; 4989 4990 // Find any user-declared move assignment operator. 4991 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 4992 E = RD->method_end(); I != E; ++I) { 4993 if (I->isMoveAssignmentOperator()) { 4994 UserDeclaredMove = *I; 4995 break; 4996 } 4997 } 4998 assert(UserDeclaredMove); 4999 } 5000 5001 if (UserDeclaredMove) { 5002 Diag(UserDeclaredMove->getLocation(), 5003 diag::note_deleted_copy_user_declared_move) 5004 << (CSM == CXXCopyAssignment) << RD 5005 << UserDeclaredMove->isMoveAssignmentOperator(); 5006 return true; 5007 } 5008 } 5009 5010 // Do access control from the special member function 5011 ContextRAII MethodContext(*this, MD); 5012 5013 // C++11 [class.dtor]p5: 5014 // -- for a virtual destructor, lookup of the non-array deallocation function 5015 // results in an ambiguity or in a function that is deleted or inaccessible 5016 if (CSM == CXXDestructor && MD->isVirtual()) { 5017 FunctionDecl *OperatorDelete = 0; 5018 DeclarationName Name = 5019 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5020 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 5021 OperatorDelete, false)) { 5022 if (Diagnose) 5023 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 5024 return true; 5025 } 5026 } 5027 5028 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 5029 5030 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 5031 BE = RD->bases_end(); BI != BE; ++BI) 5032 if (!BI->isVirtual() && 5033 SMI.shouldDeleteForBase(BI)) 5034 return true; 5035 5036 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 5037 BE = RD->vbases_end(); BI != BE; ++BI) 5038 if (SMI.shouldDeleteForBase(BI)) 5039 return true; 5040 5041 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 5042 FE = RD->field_end(); FI != FE; ++FI) 5043 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 5044 SMI.shouldDeleteForField(*FI)) 5045 return true; 5046 5047 if (SMI.shouldDeleteForAllConstMembers()) 5048 return true; 5049 5050 return false; 5051} 5052 5053/// Perform lookup for a special member of the specified kind, and determine 5054/// whether it is trivial. If the triviality can be determined without the 5055/// lookup, skip it. This is intended for use when determining whether a 5056/// special member of a containing object is trivial, and thus does not ever 5057/// perform overload resolution for default constructors. 5058/// 5059/// If \p Selected is not \c NULL, \c *Selected will be filled in with the 5060/// member that was most likely to be intended to be trivial, if any. 5061static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD, 5062 Sema::CXXSpecialMember CSM, unsigned Quals, 5063 CXXMethodDecl **Selected) { 5064 if (Selected) 5065 *Selected = 0; 5066 5067 switch (CSM) { 5068 case Sema::CXXInvalid: 5069 llvm_unreachable("not a special member"); 5070 5071 case Sema::CXXDefaultConstructor: 5072 // C++11 [class.ctor]p5: 5073 // A default constructor is trivial if: 5074 // - all the [direct subobjects] have trivial default constructors 5075 // 5076 // Note, no overload resolution is performed in this case. 5077 if (RD->hasTrivialDefaultConstructor()) 5078 return true; 5079 5080 if (Selected) { 5081 // If there's a default constructor which could have been trivial, dig it 5082 // out. Otherwise, if there's any user-provided default constructor, point 5083 // to that as an example of why there's not a trivial one. 5084 CXXConstructorDecl *DefCtor = 0; 5085 if (RD->needsImplicitDefaultConstructor()) 5086 S.DeclareImplicitDefaultConstructor(RD); 5087 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), 5088 CE = RD->ctor_end(); CI != CE; ++CI) { 5089 if (!CI->isDefaultConstructor()) 5090 continue; 5091 DefCtor = *CI; 5092 if (!DefCtor->isUserProvided()) 5093 break; 5094 } 5095 5096 *Selected = DefCtor; 5097 } 5098 5099 return false; 5100 5101 case Sema::CXXDestructor: 5102 // C++11 [class.dtor]p5: 5103 // A destructor is trivial if: 5104 // - all the direct [subobjects] have trivial destructors 5105 if (RD->hasTrivialDestructor()) 5106 return true; 5107 5108 if (Selected) { 5109 if (RD->needsImplicitDestructor()) 5110 S.DeclareImplicitDestructor(RD); 5111 *Selected = RD->getDestructor(); 5112 } 5113 5114 return false; 5115 5116 case Sema::CXXCopyConstructor: 5117 // C++11 [class.copy]p12: 5118 // A copy constructor is trivial if: 5119 // - the constructor selected to copy each direct [subobject] is trivial 5120 if (RD->hasTrivialCopyConstructor()) { 5121 if (Quals == Qualifiers::Const) 5122 // We must either select the trivial copy constructor or reach an 5123 // ambiguity; no need to actually perform overload resolution. 5124 return true; 5125 } else if (!Selected) { 5126 return false; 5127 } 5128 // In C++98, we are not supposed to perform overload resolution here, but we 5129 // treat that as a language defect, as suggested on cxx-abi-dev, to treat 5130 // cases like B as having a non-trivial copy constructor: 5131 // struct A { template<typename T> A(T&); }; 5132 // struct B { mutable A a; }; 5133 goto NeedOverloadResolution; 5134 5135 case Sema::CXXCopyAssignment: 5136 // C++11 [class.copy]p25: 5137 // A copy assignment operator is trivial if: 5138 // - the assignment operator selected to copy each direct [subobject] is 5139 // trivial 5140 if (RD->hasTrivialCopyAssignment()) { 5141 if (Quals == Qualifiers::Const) 5142 return true; 5143 } else if (!Selected) { 5144 return false; 5145 } 5146 // In C++98, we are not supposed to perform overload resolution here, but we 5147 // treat that as a language defect. 5148 goto NeedOverloadResolution; 5149 5150 case Sema::CXXMoveConstructor: 5151 case Sema::CXXMoveAssignment: 5152 NeedOverloadResolution: 5153 Sema::SpecialMemberOverloadResult *SMOR = 5154 S.LookupSpecialMember(RD, CSM, 5155 Quals & Qualifiers::Const, 5156 Quals & Qualifiers::Volatile, 5157 /*RValueThis*/false, /*ConstThis*/false, 5158 /*VolatileThis*/false); 5159 5160 // The standard doesn't describe how to behave if the lookup is ambiguous. 5161 // We treat it as not making the member non-trivial, just like the standard 5162 // mandates for the default constructor. This should rarely matter, because 5163 // the member will also be deleted. 5164 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 5165 return true; 5166 5167 if (!SMOR->getMethod()) { 5168 assert(SMOR->getKind() == 5169 Sema::SpecialMemberOverloadResult::NoMemberOrDeleted); 5170 return false; 5171 } 5172 5173 // We deliberately don't check if we found a deleted special member. We're 5174 // not supposed to! 5175 if (Selected) 5176 *Selected = SMOR->getMethod(); 5177 return SMOR->getMethod()->isTrivial(); 5178 } 5179 5180 llvm_unreachable("unknown special method kind"); 5181} 5182 5183static CXXConstructorDecl *findUserDeclaredCtor(CXXRecordDecl *RD) { 5184 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), CE = RD->ctor_end(); 5185 CI != CE; ++CI) 5186 if (!CI->isImplicit()) 5187 return *CI; 5188 5189 // Look for constructor templates. 5190 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> tmpl_iter; 5191 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); TI != TE; ++TI) { 5192 if (CXXConstructorDecl *CD = 5193 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl())) 5194 return CD; 5195 } 5196 5197 return 0; 5198} 5199 5200/// The kind of subobject we are checking for triviality. The values of this 5201/// enumeration are used in diagnostics. 5202enum TrivialSubobjectKind { 5203 /// The subobject is a base class. 5204 TSK_BaseClass, 5205 /// The subobject is a non-static data member. 5206 TSK_Field, 5207 /// The object is actually the complete object. 5208 TSK_CompleteObject 5209}; 5210 5211/// Check whether the special member selected for a given type would be trivial. 5212static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc, 5213 QualType SubType, 5214 Sema::CXXSpecialMember CSM, 5215 TrivialSubobjectKind Kind, 5216 bool Diagnose) { 5217 CXXRecordDecl *SubRD = SubType->getAsCXXRecordDecl(); 5218 if (!SubRD) 5219 return true; 5220 5221 CXXMethodDecl *Selected; 5222 if (findTrivialSpecialMember(S, SubRD, CSM, SubType.getCVRQualifiers(), 5223 Diagnose ? &Selected : 0)) 5224 return true; 5225 5226 if (Diagnose) { 5227 if (!Selected && CSM == Sema::CXXDefaultConstructor) { 5228 S.Diag(SubobjLoc, diag::note_nontrivial_no_def_ctor) 5229 << Kind << SubType.getUnqualifiedType(); 5230 if (CXXConstructorDecl *CD = findUserDeclaredCtor(SubRD)) 5231 S.Diag(CD->getLocation(), diag::note_user_declared_ctor); 5232 } else if (!Selected) 5233 S.Diag(SubobjLoc, diag::note_nontrivial_no_copy) 5234 << Kind << SubType.getUnqualifiedType() << CSM << SubType; 5235 else if (Selected->isUserProvided()) { 5236 if (Kind == TSK_CompleteObject) 5237 S.Diag(Selected->getLocation(), diag::note_nontrivial_user_provided) 5238 << Kind << SubType.getUnqualifiedType() << CSM; 5239 else { 5240 S.Diag(SubobjLoc, diag::note_nontrivial_user_provided) 5241 << Kind << SubType.getUnqualifiedType() << CSM; 5242 S.Diag(Selected->getLocation(), diag::note_declared_at); 5243 } 5244 } else { 5245 if (Kind != TSK_CompleteObject) 5246 S.Diag(SubobjLoc, diag::note_nontrivial_subobject) 5247 << Kind << SubType.getUnqualifiedType() << CSM; 5248 5249 // Explain why the defaulted or deleted special member isn't trivial. 5250 S.SpecialMemberIsTrivial(Selected, CSM, Diagnose); 5251 } 5252 } 5253 5254 return false; 5255} 5256 5257/// Check whether the members of a class type allow a special member to be 5258/// trivial. 5259static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD, 5260 Sema::CXXSpecialMember CSM, 5261 bool ConstArg, bool Diagnose) { 5262 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 5263 FE = RD->field_end(); FI != FE; ++FI) { 5264 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 5265 continue; 5266 5267 QualType FieldType = S.Context.getBaseElementType(FI->getType()); 5268 5269 // Pretend anonymous struct or union members are members of this class. 5270 if (FI->isAnonymousStructOrUnion()) { 5271 if (!checkTrivialClassMembers(S, FieldType->getAsCXXRecordDecl(), 5272 CSM, ConstArg, Diagnose)) 5273 return false; 5274 continue; 5275 } 5276 5277 // C++11 [class.ctor]p5: 5278 // A default constructor is trivial if [...] 5279 // -- no non-static data member of its class has a 5280 // brace-or-equal-initializer 5281 if (CSM == Sema::CXXDefaultConstructor && FI->hasInClassInitializer()) { 5282 if (Diagnose) 5283 S.Diag(FI->getLocation(), diag::note_nontrivial_in_class_init) << *FI; 5284 return false; 5285 } 5286 5287 // Objective C ARC 4.3.5: 5288 // [...] nontrivally ownership-qualified types are [...] not trivially 5289 // default constructible, copy constructible, move constructible, copy 5290 // assignable, move assignable, or destructible [...] 5291 if (S.getLangOpts().ObjCAutoRefCount && 5292 FieldType.hasNonTrivialObjCLifetime()) { 5293 if (Diagnose) 5294 S.Diag(FI->getLocation(), diag::note_nontrivial_objc_ownership) 5295 << RD << FieldType.getObjCLifetime(); 5296 return false; 5297 } 5298 5299 if (ConstArg && !FI->isMutable()) 5300 FieldType.addConst(); 5301 if (!checkTrivialSubobjectCall(S, FI->getLocation(), FieldType, CSM, 5302 TSK_Field, Diagnose)) 5303 return false; 5304 } 5305 5306 return true; 5307} 5308 5309/// Diagnose why the specified class does not have a trivial special member of 5310/// the given kind. 5311void Sema::DiagnoseNontrivial(const CXXRecordDecl *RD, CXXSpecialMember CSM) { 5312 QualType Ty = Context.getRecordType(RD); 5313 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) 5314 Ty.addConst(); 5315 5316 checkTrivialSubobjectCall(*this, RD->getLocation(), Ty, CSM, 5317 TSK_CompleteObject, /*Diagnose*/true); 5318} 5319 5320/// Determine whether a defaulted or deleted special member function is trivial, 5321/// as specified in C++11 [class.ctor]p5, C++11 [class.copy]p12, 5322/// C++11 [class.copy]p25, and C++11 [class.dtor]p5. 5323bool Sema::SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM, 5324 bool Diagnose) { 5325 assert(!MD->isUserProvided() && CSM != CXXInvalid && "not special enough"); 5326 5327 CXXRecordDecl *RD = MD->getParent(); 5328 5329 bool ConstArg = false; 5330 5331 // C++11 [class.copy]p12, p25: 5332 // A [special member] is trivial if its declared parameter type is the same 5333 // as if it had been implicitly declared [...] 5334 switch (CSM) { 5335 case CXXDefaultConstructor: 5336 case CXXDestructor: 5337 // Trivial default constructors and destructors cannot have parameters. 5338 break; 5339 5340 case CXXCopyConstructor: 5341 case CXXCopyAssignment: { 5342 // Trivial copy operations always have const, non-volatile parameter types. 5343 ConstArg = true; 5344 const ParmVarDecl *Param0 = MD->getParamDecl(0); 5345 const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>(); 5346 if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) { 5347 if (Diagnose) 5348 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5349 << Param0->getSourceRange() << Param0->getType() 5350 << Context.getLValueReferenceType( 5351 Context.getRecordType(RD).withConst()); 5352 return false; 5353 } 5354 break; 5355 } 5356 5357 case CXXMoveConstructor: 5358 case CXXMoveAssignment: { 5359 // Trivial move operations always have non-cv-qualified parameters. 5360 const ParmVarDecl *Param0 = MD->getParamDecl(0); 5361 const RValueReferenceType *RT = 5362 Param0->getType()->getAs<RValueReferenceType>(); 5363 if (!RT || RT->getPointeeType().getCVRQualifiers()) { 5364 if (Diagnose) 5365 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5366 << Param0->getSourceRange() << Param0->getType() 5367 << Context.getRValueReferenceType(Context.getRecordType(RD)); 5368 return false; 5369 } 5370 break; 5371 } 5372 5373 case CXXInvalid: 5374 llvm_unreachable("not a special member"); 5375 } 5376 5377 // FIXME: We require that the parameter-declaration-clause is equivalent to 5378 // that of an implicit declaration, not just that the declared parameter type 5379 // matches, in order to prevent absuridities like a function simultaneously 5380 // being a trivial copy constructor and a non-trivial default constructor. 5381 // This issue has not yet been assigned a core issue number. 5382 if (MD->getMinRequiredArguments() < MD->getNumParams()) { 5383 if (Diagnose) 5384 Diag(MD->getParamDecl(MD->getMinRequiredArguments())->getLocation(), 5385 diag::note_nontrivial_default_arg) 5386 << MD->getParamDecl(MD->getMinRequiredArguments())->getSourceRange(); 5387 return false; 5388 } 5389 if (MD->isVariadic()) { 5390 if (Diagnose) 5391 Diag(MD->getLocation(), diag::note_nontrivial_variadic); 5392 return false; 5393 } 5394 5395 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5396 // A copy/move [constructor or assignment operator] is trivial if 5397 // -- the [member] selected to copy/move each direct base class subobject 5398 // is trivial 5399 // 5400 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5401 // A [default constructor or destructor] is trivial if 5402 // -- all the direct base classes have trivial [default constructors or 5403 // destructors] 5404 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 5405 BE = RD->bases_end(); BI != BE; ++BI) 5406 if (!checkTrivialSubobjectCall(*this, BI->getLocStart(), 5407 ConstArg ? BI->getType().withConst() 5408 : BI->getType(), 5409 CSM, TSK_BaseClass, Diagnose)) 5410 return false; 5411 5412 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5413 // A copy/move [constructor or assignment operator] for a class X is 5414 // trivial if 5415 // -- for each non-static data member of X that is of class type (or array 5416 // thereof), the constructor selected to copy/move that member is 5417 // trivial 5418 // 5419 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5420 // A [default constructor or destructor] is trivial if 5421 // -- for all of the non-static data members of its class that are of class 5422 // type (or array thereof), each such class has a trivial [default 5423 // constructor or destructor] 5424 if (!checkTrivialClassMembers(*this, RD, CSM, ConstArg, Diagnose)) 5425 return false; 5426 5427 // C++11 [class.dtor]p5: 5428 // A destructor is trivial if [...] 5429 // -- the destructor is not virtual 5430 if (CSM == CXXDestructor && MD->isVirtual()) { 5431 if (Diagnose) 5432 Diag(MD->getLocation(), diag::note_nontrivial_virtual_dtor) << RD; 5433 return false; 5434 } 5435 5436 // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25: 5437 // A [special member] for class X is trivial if [...] 5438 // -- class X has no virtual functions and no virtual base classes 5439 if (CSM != CXXDestructor && MD->getParent()->isDynamicClass()) { 5440 if (!Diagnose) 5441 return false; 5442 5443 if (RD->getNumVBases()) { 5444 // Check for virtual bases. We already know that the corresponding 5445 // member in all bases is trivial, so vbases must all be direct. 5446 CXXBaseSpecifier &BS = *RD->vbases_begin(); 5447 assert(BS.isVirtual()); 5448 Diag(BS.getLocStart(), diag::note_nontrivial_has_virtual) << RD << 1; 5449 return false; 5450 } 5451 5452 // Must have a virtual method. 5453 for (CXXRecordDecl::method_iterator MI = RD->method_begin(), 5454 ME = RD->method_end(); MI != ME; ++MI) { 5455 if (MI->isVirtual()) { 5456 SourceLocation MLoc = MI->getLocStart(); 5457 Diag(MLoc, diag::note_nontrivial_has_virtual) << RD << 0; 5458 return false; 5459 } 5460 } 5461 5462 llvm_unreachable("dynamic class with no vbases and no virtual functions"); 5463 } 5464 5465 // Looks like it's trivial! 5466 return true; 5467} 5468 5469/// \brief Data used with FindHiddenVirtualMethod 5470namespace { 5471 struct FindHiddenVirtualMethodData { 5472 Sema *S; 5473 CXXMethodDecl *Method; 5474 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 5475 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 5476 }; 5477} 5478 5479/// \brief Check whether any most overriden method from MD in Methods 5480static bool CheckMostOverridenMethods(const CXXMethodDecl *MD, 5481 const llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5482 if (MD->size_overridden_methods() == 0) 5483 return Methods.count(MD->getCanonicalDecl()); 5484 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5485 E = MD->end_overridden_methods(); 5486 I != E; ++I) 5487 if (CheckMostOverridenMethods(*I, Methods)) 5488 return true; 5489 return false; 5490} 5491 5492/// \brief Member lookup function that determines whether a given C++ 5493/// method overloads virtual methods in a base class without overriding any, 5494/// to be used with CXXRecordDecl::lookupInBases(). 5495static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 5496 CXXBasePath &Path, 5497 void *UserData) { 5498 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 5499 5500 FindHiddenVirtualMethodData &Data 5501 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 5502 5503 DeclarationName Name = Data.Method->getDeclName(); 5504 assert(Name.getNameKind() == DeclarationName::Identifier); 5505 5506 bool foundSameNameMethod = false; 5507 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 5508 for (Path.Decls = BaseRecord->lookup(Name); 5509 !Path.Decls.empty(); 5510 Path.Decls = Path.Decls.slice(1)) { 5511 NamedDecl *D = Path.Decls.front(); 5512 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 5513 MD = MD->getCanonicalDecl(); 5514 foundSameNameMethod = true; 5515 // Interested only in hidden virtual methods. 5516 if (!MD->isVirtual()) 5517 continue; 5518 // If the method we are checking overrides a method from its base 5519 // don't warn about the other overloaded methods. 5520 if (!Data.S->IsOverload(Data.Method, MD, false)) 5521 return true; 5522 // Collect the overload only if its hidden. 5523 if (!CheckMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods)) 5524 overloadedMethods.push_back(MD); 5525 } 5526 } 5527 5528 if (foundSameNameMethod) 5529 Data.OverloadedMethods.append(overloadedMethods.begin(), 5530 overloadedMethods.end()); 5531 return foundSameNameMethod; 5532} 5533 5534/// \brief Add the most overriden methods from MD to Methods 5535static void AddMostOverridenMethods(const CXXMethodDecl *MD, 5536 llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5537 if (MD->size_overridden_methods() == 0) 5538 Methods.insert(MD->getCanonicalDecl()); 5539 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5540 E = MD->end_overridden_methods(); 5541 I != E; ++I) 5542 AddMostOverridenMethods(*I, Methods); 5543} 5544 5545/// \brief See if a method overloads virtual methods in a base class without 5546/// overriding any. 5547void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 5548 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 5549 MD->getLocation()) == DiagnosticsEngine::Ignored) 5550 return; 5551 if (!MD->getDeclName().isIdentifier()) 5552 return; 5553 5554 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 5555 /*bool RecordPaths=*/false, 5556 /*bool DetectVirtual=*/false); 5557 FindHiddenVirtualMethodData Data; 5558 Data.Method = MD; 5559 Data.S = this; 5560 5561 // Keep the base methods that were overriden or introduced in the subclass 5562 // by 'using' in a set. A base method not in this set is hidden. 5563 DeclContext::lookup_result R = DC->lookup(MD->getDeclName()); 5564 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) { 5565 NamedDecl *ND = *I; 5566 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*I)) 5567 ND = shad->getTargetDecl(); 5568 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND)) 5569 AddMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods); 5570 } 5571 5572 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 5573 !Data.OverloadedMethods.empty()) { 5574 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 5575 << MD << (Data.OverloadedMethods.size() > 1); 5576 5577 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 5578 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 5579 PartialDiagnostic PD = PDiag( 5580 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 5581 HandleFunctionTypeMismatch(PD, MD->getType(), overloadedMD->getType()); 5582 Diag(overloadedMD->getLocation(), PD); 5583 } 5584 } 5585} 5586 5587void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 5588 Decl *TagDecl, 5589 SourceLocation LBrac, 5590 SourceLocation RBrac, 5591 AttributeList *AttrList) { 5592 if (!TagDecl) 5593 return; 5594 5595 AdjustDeclIfTemplate(TagDecl); 5596 5597 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 5598 if (l->getKind() != AttributeList::AT_Visibility) 5599 continue; 5600 l->setInvalid(); 5601 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 5602 l->getName(); 5603 } 5604 5605 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 5606 // strict aliasing violation! 5607 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 5608 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 5609 5610 CheckCompletedCXXClass( 5611 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 5612} 5613 5614/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 5615/// special functions, such as the default constructor, copy 5616/// constructor, or destructor, to the given C++ class (C++ 5617/// [special]p1). This routine can only be executed just before the 5618/// definition of the class is complete. 5619void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 5620 if (!ClassDecl->hasUserDeclaredConstructor()) 5621 ++ASTContext::NumImplicitDefaultConstructors; 5622 5623 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 5624 ++ASTContext::NumImplicitCopyConstructors; 5625 5626 // If the properties or semantics of the copy constructor couldn't be 5627 // determined while the class was being declared, force a declaration 5628 // of it now. 5629 if (ClassDecl->needsOverloadResolutionForCopyConstructor()) 5630 DeclareImplicitCopyConstructor(ClassDecl); 5631 } 5632 5633 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveConstructor()) { 5634 ++ASTContext::NumImplicitMoveConstructors; 5635 5636 if (ClassDecl->needsOverloadResolutionForMoveConstructor()) 5637 DeclareImplicitMoveConstructor(ClassDecl); 5638 } 5639 5640 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 5641 ++ASTContext::NumImplicitCopyAssignmentOperators; 5642 5643 // If we have a dynamic class, then the copy assignment operator may be 5644 // virtual, so we have to declare it immediately. This ensures that, e.g., 5645 // it shows up in the right place in the vtable and that we diagnose 5646 // problems with the implicit exception specification. 5647 if (ClassDecl->isDynamicClass() || 5648 ClassDecl->needsOverloadResolutionForCopyAssignment()) 5649 DeclareImplicitCopyAssignment(ClassDecl); 5650 } 5651 5652 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveAssignment()) { 5653 ++ASTContext::NumImplicitMoveAssignmentOperators; 5654 5655 // Likewise for the move assignment operator. 5656 if (ClassDecl->isDynamicClass() || 5657 ClassDecl->needsOverloadResolutionForMoveAssignment()) 5658 DeclareImplicitMoveAssignment(ClassDecl); 5659 } 5660 5661 if (!ClassDecl->hasUserDeclaredDestructor()) { 5662 ++ASTContext::NumImplicitDestructors; 5663 5664 // If we have a dynamic class, then the destructor may be virtual, so we 5665 // have to declare the destructor immediately. This ensures that, e.g., it 5666 // shows up in the right place in the vtable and that we diagnose problems 5667 // with the implicit exception specification. 5668 if (ClassDecl->isDynamicClass() || 5669 ClassDecl->needsOverloadResolutionForDestructor()) 5670 DeclareImplicitDestructor(ClassDecl); 5671 } 5672} 5673 5674void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 5675 if (!D) 5676 return; 5677 5678 int NumParamList = D->getNumTemplateParameterLists(); 5679 for (int i = 0; i < NumParamList; i++) { 5680 TemplateParameterList* Params = D->getTemplateParameterList(i); 5681 for (TemplateParameterList::iterator Param = Params->begin(), 5682 ParamEnd = Params->end(); 5683 Param != ParamEnd; ++Param) { 5684 NamedDecl *Named = cast<NamedDecl>(*Param); 5685 if (Named->getDeclName()) { 5686 S->AddDecl(Named); 5687 IdResolver.AddDecl(Named); 5688 } 5689 } 5690 } 5691} 5692 5693void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5694 if (!D) 5695 return; 5696 5697 TemplateParameterList *Params = 0; 5698 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5699 Params = Template->getTemplateParameters(); 5700 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5701 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5702 Params = PartialSpec->getTemplateParameters(); 5703 else 5704 return; 5705 5706 for (TemplateParameterList::iterator Param = Params->begin(), 5707 ParamEnd = Params->end(); 5708 Param != ParamEnd; ++Param) { 5709 NamedDecl *Named = cast<NamedDecl>(*Param); 5710 if (Named->getDeclName()) { 5711 S->AddDecl(Named); 5712 IdResolver.AddDecl(Named); 5713 } 5714 } 5715} 5716 5717void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5718 if (!RecordD) return; 5719 AdjustDeclIfTemplate(RecordD); 5720 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5721 PushDeclContext(S, Record); 5722} 5723 5724void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5725 if (!RecordD) return; 5726 PopDeclContext(); 5727} 5728 5729/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5730/// parsing a top-level (non-nested) C++ class, and we are now 5731/// parsing those parts of the given Method declaration that could 5732/// not be parsed earlier (C++ [class.mem]p2), such as default 5733/// arguments. This action should enter the scope of the given 5734/// Method declaration as if we had just parsed the qualified method 5735/// name. However, it should not bring the parameters into scope; 5736/// that will be performed by ActOnDelayedCXXMethodParameter. 5737void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5738} 5739 5740/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5741/// C++ method declaration. We're (re-)introducing the given 5742/// function parameter into scope for use in parsing later parts of 5743/// the method declaration. For example, we could see an 5744/// ActOnParamDefaultArgument event for this parameter. 5745void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5746 if (!ParamD) 5747 return; 5748 5749 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5750 5751 // If this parameter has an unparsed default argument, clear it out 5752 // to make way for the parsed default argument. 5753 if (Param->hasUnparsedDefaultArg()) 5754 Param->setDefaultArg(0); 5755 5756 S->AddDecl(Param); 5757 if (Param->getDeclName()) 5758 IdResolver.AddDecl(Param); 5759} 5760 5761/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5762/// processing the delayed method declaration for Method. The method 5763/// declaration is now considered finished. There may be a separate 5764/// ActOnStartOfFunctionDef action later (not necessarily 5765/// immediately!) for this method, if it was also defined inside the 5766/// class body. 5767void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5768 if (!MethodD) 5769 return; 5770 5771 AdjustDeclIfTemplate(MethodD); 5772 5773 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5774 5775 // Now that we have our default arguments, check the constructor 5776 // again. It could produce additional diagnostics or affect whether 5777 // the class has implicitly-declared destructors, among other 5778 // things. 5779 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5780 CheckConstructor(Constructor); 5781 5782 // Check the default arguments, which we may have added. 5783 if (!Method->isInvalidDecl()) 5784 CheckCXXDefaultArguments(Method); 5785} 5786 5787/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5788/// the well-formedness of the constructor declarator @p D with type @p 5789/// R. If there are any errors in the declarator, this routine will 5790/// emit diagnostics and set the invalid bit to true. In any case, the type 5791/// will be updated to reflect a well-formed type for the constructor and 5792/// returned. 5793QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5794 StorageClass &SC) { 5795 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5796 5797 // C++ [class.ctor]p3: 5798 // A constructor shall not be virtual (10.3) or static (9.4). A 5799 // constructor can be invoked for a const, volatile or const 5800 // volatile object. A constructor shall not be declared const, 5801 // volatile, or const volatile (9.3.2). 5802 if (isVirtual) { 5803 if (!D.isInvalidType()) 5804 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5805 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5806 << SourceRange(D.getIdentifierLoc()); 5807 D.setInvalidType(); 5808 } 5809 if (SC == SC_Static) { 5810 if (!D.isInvalidType()) 5811 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5812 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5813 << SourceRange(D.getIdentifierLoc()); 5814 D.setInvalidType(); 5815 SC = SC_None; 5816 } 5817 5818 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5819 if (FTI.TypeQuals != 0) { 5820 if (FTI.TypeQuals & Qualifiers::Const) 5821 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5822 << "const" << SourceRange(D.getIdentifierLoc()); 5823 if (FTI.TypeQuals & Qualifiers::Volatile) 5824 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5825 << "volatile" << SourceRange(D.getIdentifierLoc()); 5826 if (FTI.TypeQuals & Qualifiers::Restrict) 5827 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5828 << "restrict" << SourceRange(D.getIdentifierLoc()); 5829 D.setInvalidType(); 5830 } 5831 5832 // C++0x [class.ctor]p4: 5833 // A constructor shall not be declared with a ref-qualifier. 5834 if (FTI.hasRefQualifier()) { 5835 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5836 << FTI.RefQualifierIsLValueRef 5837 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5838 D.setInvalidType(); 5839 } 5840 5841 // Rebuild the function type "R" without any type qualifiers (in 5842 // case any of the errors above fired) and with "void" as the 5843 // return type, since constructors don't have return types. 5844 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5845 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5846 return R; 5847 5848 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5849 EPI.TypeQuals = 0; 5850 EPI.RefQualifier = RQ_None; 5851 5852 return Context.getFunctionType(Context.VoidTy, Proto->getArgTypes(), EPI); 5853} 5854 5855/// CheckConstructor - Checks a fully-formed constructor for 5856/// well-formedness, issuing any diagnostics required. Returns true if 5857/// the constructor declarator is invalid. 5858void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5859 CXXRecordDecl *ClassDecl 5860 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5861 if (!ClassDecl) 5862 return Constructor->setInvalidDecl(); 5863 5864 // C++ [class.copy]p3: 5865 // A declaration of a constructor for a class X is ill-formed if 5866 // its first parameter is of type (optionally cv-qualified) X and 5867 // either there are no other parameters or else all other 5868 // parameters have default arguments. 5869 if (!Constructor->isInvalidDecl() && 5870 ((Constructor->getNumParams() == 1) || 5871 (Constructor->getNumParams() > 1 && 5872 Constructor->getParamDecl(1)->hasDefaultArg())) && 5873 Constructor->getTemplateSpecializationKind() 5874 != TSK_ImplicitInstantiation) { 5875 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5876 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5877 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5878 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5879 const char *ConstRef 5880 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5881 : " const &"; 5882 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5883 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5884 5885 // FIXME: Rather that making the constructor invalid, we should endeavor 5886 // to fix the type. 5887 Constructor->setInvalidDecl(); 5888 } 5889 } 5890} 5891 5892/// CheckDestructor - Checks a fully-formed destructor definition for 5893/// well-formedness, issuing any diagnostics required. Returns true 5894/// on error. 5895bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5896 CXXRecordDecl *RD = Destructor->getParent(); 5897 5898 if (Destructor->isVirtual()) { 5899 SourceLocation Loc; 5900 5901 if (!Destructor->isImplicit()) 5902 Loc = Destructor->getLocation(); 5903 else 5904 Loc = RD->getLocation(); 5905 5906 // If we have a virtual destructor, look up the deallocation function 5907 FunctionDecl *OperatorDelete = 0; 5908 DeclarationName Name = 5909 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5910 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5911 return true; 5912 5913 MarkFunctionReferenced(Loc, OperatorDelete); 5914 5915 Destructor->setOperatorDelete(OperatorDelete); 5916 } 5917 5918 return false; 5919} 5920 5921static inline bool 5922FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5923 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5924 FTI.ArgInfo[0].Param && 5925 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5926} 5927 5928/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5929/// the well-formednes of the destructor declarator @p D with type @p 5930/// R. If there are any errors in the declarator, this routine will 5931/// emit diagnostics and set the declarator to invalid. Even if this happens, 5932/// will be updated to reflect a well-formed type for the destructor and 5933/// returned. 5934QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5935 StorageClass& SC) { 5936 // C++ [class.dtor]p1: 5937 // [...] A typedef-name that names a class is a class-name 5938 // (7.1.3); however, a typedef-name that names a class shall not 5939 // be used as the identifier in the declarator for a destructor 5940 // declaration. 5941 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5942 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5943 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5944 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5945 else if (const TemplateSpecializationType *TST = 5946 DeclaratorType->getAs<TemplateSpecializationType>()) 5947 if (TST->isTypeAlias()) 5948 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5949 << DeclaratorType << 1; 5950 5951 // C++ [class.dtor]p2: 5952 // A destructor is used to destroy objects of its class type. A 5953 // destructor takes no parameters, and no return type can be 5954 // specified for it (not even void). The address of a destructor 5955 // shall not be taken. A destructor shall not be static. A 5956 // destructor can be invoked for a const, volatile or const 5957 // volatile object. A destructor shall not be declared const, 5958 // volatile or const volatile (9.3.2). 5959 if (SC == SC_Static) { 5960 if (!D.isInvalidType()) 5961 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5962 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5963 << SourceRange(D.getIdentifierLoc()) 5964 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5965 5966 SC = SC_None; 5967 } 5968 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5969 // Destructors don't have return types, but the parser will 5970 // happily parse something like: 5971 // 5972 // class X { 5973 // float ~X(); 5974 // }; 5975 // 5976 // The return type will be eliminated later. 5977 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5978 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5979 << SourceRange(D.getIdentifierLoc()); 5980 } 5981 5982 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5983 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5984 if (FTI.TypeQuals & Qualifiers::Const) 5985 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5986 << "const" << SourceRange(D.getIdentifierLoc()); 5987 if (FTI.TypeQuals & Qualifiers::Volatile) 5988 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5989 << "volatile" << SourceRange(D.getIdentifierLoc()); 5990 if (FTI.TypeQuals & Qualifiers::Restrict) 5991 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5992 << "restrict" << SourceRange(D.getIdentifierLoc()); 5993 D.setInvalidType(); 5994 } 5995 5996 // C++0x [class.dtor]p2: 5997 // A destructor shall not be declared with a ref-qualifier. 5998 if (FTI.hasRefQualifier()) { 5999 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 6000 << FTI.RefQualifierIsLValueRef 6001 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 6002 D.setInvalidType(); 6003 } 6004 6005 // Make sure we don't have any parameters. 6006 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 6007 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 6008 6009 // Delete the parameters. 6010 FTI.freeArgs(); 6011 D.setInvalidType(); 6012 } 6013 6014 // Make sure the destructor isn't variadic. 6015 if (FTI.isVariadic) { 6016 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 6017 D.setInvalidType(); 6018 } 6019 6020 // Rebuild the function type "R" without any type qualifiers or 6021 // parameters (in case any of the errors above fired) and with 6022 // "void" as the return type, since destructors don't have return 6023 // types. 6024 if (!D.isInvalidType()) 6025 return R; 6026 6027 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 6028 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 6029 EPI.Variadic = false; 6030 EPI.TypeQuals = 0; 6031 EPI.RefQualifier = RQ_None; 6032 return Context.getFunctionType(Context.VoidTy, ArrayRef<QualType>(), EPI); 6033} 6034 6035/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 6036/// well-formednes of the conversion function declarator @p D with 6037/// type @p R. If there are any errors in the declarator, this routine 6038/// will emit diagnostics and return true. Otherwise, it will return 6039/// false. Either way, the type @p R will be updated to reflect a 6040/// well-formed type for the conversion operator. 6041void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 6042 StorageClass& SC) { 6043 // C++ [class.conv.fct]p1: 6044 // Neither parameter types nor return type can be specified. The 6045 // type of a conversion function (8.3.5) is "function taking no 6046 // parameter returning conversion-type-id." 6047 if (SC == SC_Static) { 6048 if (!D.isInvalidType()) 6049 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 6050 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 6051 << SourceRange(D.getIdentifierLoc()); 6052 D.setInvalidType(); 6053 SC = SC_None; 6054 } 6055 6056 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 6057 6058 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 6059 // Conversion functions don't have return types, but the parser will 6060 // happily parse something like: 6061 // 6062 // class X { 6063 // float operator bool(); 6064 // }; 6065 // 6066 // The return type will be changed later anyway. 6067 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 6068 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 6069 << SourceRange(D.getIdentifierLoc()); 6070 D.setInvalidType(); 6071 } 6072 6073 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 6074 6075 // Make sure we don't have any parameters. 6076 if (Proto->getNumArgs() > 0) { 6077 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 6078 6079 // Delete the parameters. 6080 D.getFunctionTypeInfo().freeArgs(); 6081 D.setInvalidType(); 6082 } else if (Proto->isVariadic()) { 6083 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 6084 D.setInvalidType(); 6085 } 6086 6087 // Diagnose "&operator bool()" and other such nonsense. This 6088 // is actually a gcc extension which we don't support. 6089 if (Proto->getResultType() != ConvType) { 6090 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 6091 << Proto->getResultType(); 6092 D.setInvalidType(); 6093 ConvType = Proto->getResultType(); 6094 } 6095 6096 // C++ [class.conv.fct]p4: 6097 // The conversion-type-id shall not represent a function type nor 6098 // an array type. 6099 if (ConvType->isArrayType()) { 6100 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 6101 ConvType = Context.getPointerType(ConvType); 6102 D.setInvalidType(); 6103 } else if (ConvType->isFunctionType()) { 6104 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 6105 ConvType = Context.getPointerType(ConvType); 6106 D.setInvalidType(); 6107 } 6108 6109 // Rebuild the function type "R" without any parameters (in case any 6110 // of the errors above fired) and with the conversion type as the 6111 // return type. 6112 if (D.isInvalidType()) 6113 R = Context.getFunctionType(ConvType, ArrayRef<QualType>(), 6114 Proto->getExtProtoInfo()); 6115 6116 // C++0x explicit conversion operators. 6117 if (D.getDeclSpec().isExplicitSpecified()) 6118 Diag(D.getDeclSpec().getExplicitSpecLoc(), 6119 getLangOpts().CPlusPlus11 ? 6120 diag::warn_cxx98_compat_explicit_conversion_functions : 6121 diag::ext_explicit_conversion_functions) 6122 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 6123} 6124 6125/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 6126/// the declaration of the given C++ conversion function. This routine 6127/// is responsible for recording the conversion function in the C++ 6128/// class, if possible. 6129Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 6130 assert(Conversion && "Expected to receive a conversion function declaration"); 6131 6132 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 6133 6134 // Make sure we aren't redeclaring the conversion function. 6135 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 6136 6137 // C++ [class.conv.fct]p1: 6138 // [...] A conversion function is never used to convert a 6139 // (possibly cv-qualified) object to the (possibly cv-qualified) 6140 // same object type (or a reference to it), to a (possibly 6141 // cv-qualified) base class of that type (or a reference to it), 6142 // or to (possibly cv-qualified) void. 6143 // FIXME: Suppress this warning if the conversion function ends up being a 6144 // virtual function that overrides a virtual function in a base class. 6145 QualType ClassType 6146 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6147 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 6148 ConvType = ConvTypeRef->getPointeeType(); 6149 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 6150 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 6151 /* Suppress diagnostics for instantiations. */; 6152 else if (ConvType->isRecordType()) { 6153 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 6154 if (ConvType == ClassType) 6155 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 6156 << ClassType; 6157 else if (IsDerivedFrom(ClassType, ConvType)) 6158 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 6159 << ClassType << ConvType; 6160 } else if (ConvType->isVoidType()) { 6161 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 6162 << ClassType << ConvType; 6163 } 6164 6165 if (FunctionTemplateDecl *ConversionTemplate 6166 = Conversion->getDescribedFunctionTemplate()) 6167 return ConversionTemplate; 6168 6169 return Conversion; 6170} 6171 6172//===----------------------------------------------------------------------===// 6173// Namespace Handling 6174//===----------------------------------------------------------------------===// 6175 6176/// \brief Diagnose a mismatch in 'inline' qualifiers when a namespace is 6177/// reopened. 6178static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc, 6179 SourceLocation Loc, 6180 IdentifierInfo *II, bool *IsInline, 6181 NamespaceDecl *PrevNS) { 6182 assert(*IsInline != PrevNS->isInline()); 6183 6184 // HACK: Work around a bug in libstdc++4.6's <atomic>, where 6185 // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as 6186 // inline namespaces, with the intention of bringing names into namespace std. 6187 // 6188 // We support this just well enough to get that case working; this is not 6189 // sufficient to support reopening namespaces as inline in general. 6190 if (*IsInline && II && II->getName().startswith("__atomic") && 6191 S.getSourceManager().isInSystemHeader(Loc)) { 6192 // Mark all prior declarations of the namespace as inline. 6193 for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS; 6194 NS = NS->getPreviousDecl()) 6195 NS->setInline(*IsInline); 6196 // Patch up the lookup table for the containing namespace. This isn't really 6197 // correct, but it's good enough for this particular case. 6198 for (DeclContext::decl_iterator I = PrevNS->decls_begin(), 6199 E = PrevNS->decls_end(); I != E; ++I) 6200 if (NamedDecl *ND = dyn_cast<NamedDecl>(*I)) 6201 PrevNS->getParent()->makeDeclVisibleInContext(ND); 6202 return; 6203 } 6204 6205 if (PrevNS->isInline()) 6206 // The user probably just forgot the 'inline', so suggest that it 6207 // be added back. 6208 S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 6209 << FixItHint::CreateInsertion(KeywordLoc, "inline "); 6210 else 6211 S.Diag(Loc, diag::err_inline_namespace_mismatch) 6212 << IsInline; 6213 6214 S.Diag(PrevNS->getLocation(), diag::note_previous_definition); 6215 *IsInline = PrevNS->isInline(); 6216} 6217 6218/// ActOnStartNamespaceDef - This is called at the start of a namespace 6219/// definition. 6220Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 6221 SourceLocation InlineLoc, 6222 SourceLocation NamespaceLoc, 6223 SourceLocation IdentLoc, 6224 IdentifierInfo *II, 6225 SourceLocation LBrace, 6226 AttributeList *AttrList) { 6227 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 6228 // For anonymous namespace, take the location of the left brace. 6229 SourceLocation Loc = II ? IdentLoc : LBrace; 6230 bool IsInline = InlineLoc.isValid(); 6231 bool IsInvalid = false; 6232 bool IsStd = false; 6233 bool AddToKnown = false; 6234 Scope *DeclRegionScope = NamespcScope->getParent(); 6235 6236 NamespaceDecl *PrevNS = 0; 6237 if (II) { 6238 // C++ [namespace.def]p2: 6239 // The identifier in an original-namespace-definition shall not 6240 // have been previously defined in the declarative region in 6241 // which the original-namespace-definition appears. The 6242 // identifier in an original-namespace-definition is the name of 6243 // the namespace. Subsequently in that declarative region, it is 6244 // treated as an original-namespace-name. 6245 // 6246 // Since namespace names are unique in their scope, and we don't 6247 // look through using directives, just look for any ordinary names. 6248 6249 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 6250 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 6251 Decl::IDNS_Namespace; 6252 NamedDecl *PrevDecl = 0; 6253 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 6254 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 6255 ++I) { 6256 if ((*I)->getIdentifierNamespace() & IDNS) { 6257 PrevDecl = *I; 6258 break; 6259 } 6260 } 6261 6262 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 6263 6264 if (PrevNS) { 6265 // This is an extended namespace definition. 6266 if (IsInline != PrevNS->isInline()) 6267 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II, 6268 &IsInline, PrevNS); 6269 } else if (PrevDecl) { 6270 // This is an invalid name redefinition. 6271 Diag(Loc, diag::err_redefinition_different_kind) 6272 << II; 6273 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6274 IsInvalid = true; 6275 // Continue on to push Namespc as current DeclContext and return it. 6276 } else if (II->isStr("std") && 6277 CurContext->getRedeclContext()->isTranslationUnit()) { 6278 // This is the first "real" definition of the namespace "std", so update 6279 // our cache of the "std" namespace to point at this definition. 6280 PrevNS = getStdNamespace(); 6281 IsStd = true; 6282 AddToKnown = !IsInline; 6283 } else { 6284 // We've seen this namespace for the first time. 6285 AddToKnown = !IsInline; 6286 } 6287 } else { 6288 // Anonymous namespaces. 6289 6290 // Determine whether the parent already has an anonymous namespace. 6291 DeclContext *Parent = CurContext->getRedeclContext(); 6292 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6293 PrevNS = TU->getAnonymousNamespace(); 6294 } else { 6295 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 6296 PrevNS = ND->getAnonymousNamespace(); 6297 } 6298 6299 if (PrevNS && IsInline != PrevNS->isInline()) 6300 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II, 6301 &IsInline, PrevNS); 6302 } 6303 6304 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 6305 StartLoc, Loc, II, PrevNS); 6306 if (IsInvalid) 6307 Namespc->setInvalidDecl(); 6308 6309 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 6310 6311 // FIXME: Should we be merging attributes? 6312 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 6313 PushNamespaceVisibilityAttr(Attr, Loc); 6314 6315 if (IsStd) 6316 StdNamespace = Namespc; 6317 if (AddToKnown) 6318 KnownNamespaces[Namespc] = false; 6319 6320 if (II) { 6321 PushOnScopeChains(Namespc, DeclRegionScope); 6322 } else { 6323 // Link the anonymous namespace into its parent. 6324 DeclContext *Parent = CurContext->getRedeclContext(); 6325 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6326 TU->setAnonymousNamespace(Namespc); 6327 } else { 6328 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 6329 } 6330 6331 CurContext->addDecl(Namespc); 6332 6333 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 6334 // behaves as if it were replaced by 6335 // namespace unique { /* empty body */ } 6336 // using namespace unique; 6337 // namespace unique { namespace-body } 6338 // where all occurrences of 'unique' in a translation unit are 6339 // replaced by the same identifier and this identifier differs 6340 // from all other identifiers in the entire program. 6341 6342 // We just create the namespace with an empty name and then add an 6343 // implicit using declaration, just like the standard suggests. 6344 // 6345 // CodeGen enforces the "universally unique" aspect by giving all 6346 // declarations semantically contained within an anonymous 6347 // namespace internal linkage. 6348 6349 if (!PrevNS) { 6350 UsingDirectiveDecl* UD 6351 = UsingDirectiveDecl::Create(Context, Parent, 6352 /* 'using' */ LBrace, 6353 /* 'namespace' */ SourceLocation(), 6354 /* qualifier */ NestedNameSpecifierLoc(), 6355 /* identifier */ SourceLocation(), 6356 Namespc, 6357 /* Ancestor */ Parent); 6358 UD->setImplicit(); 6359 Parent->addDecl(UD); 6360 } 6361 } 6362 6363 ActOnDocumentableDecl(Namespc); 6364 6365 // Although we could have an invalid decl (i.e. the namespace name is a 6366 // redefinition), push it as current DeclContext and try to continue parsing. 6367 // FIXME: We should be able to push Namespc here, so that the each DeclContext 6368 // for the namespace has the declarations that showed up in that particular 6369 // namespace definition. 6370 PushDeclContext(NamespcScope, Namespc); 6371 return Namespc; 6372} 6373 6374/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 6375/// is a namespace alias, returns the namespace it points to. 6376static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 6377 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 6378 return AD->getNamespace(); 6379 return dyn_cast_or_null<NamespaceDecl>(D); 6380} 6381 6382/// ActOnFinishNamespaceDef - This callback is called after a namespace is 6383/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 6384void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 6385 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 6386 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 6387 Namespc->setRBraceLoc(RBrace); 6388 PopDeclContext(); 6389 if (Namespc->hasAttr<VisibilityAttr>()) 6390 PopPragmaVisibility(true, RBrace); 6391} 6392 6393CXXRecordDecl *Sema::getStdBadAlloc() const { 6394 return cast_or_null<CXXRecordDecl>( 6395 StdBadAlloc.get(Context.getExternalSource())); 6396} 6397 6398NamespaceDecl *Sema::getStdNamespace() const { 6399 return cast_or_null<NamespaceDecl>( 6400 StdNamespace.get(Context.getExternalSource())); 6401} 6402 6403/// \brief Retrieve the special "std" namespace, which may require us to 6404/// implicitly define the namespace. 6405NamespaceDecl *Sema::getOrCreateStdNamespace() { 6406 if (!StdNamespace) { 6407 // The "std" namespace has not yet been defined, so build one implicitly. 6408 StdNamespace = NamespaceDecl::Create(Context, 6409 Context.getTranslationUnitDecl(), 6410 /*Inline=*/false, 6411 SourceLocation(), SourceLocation(), 6412 &PP.getIdentifierTable().get("std"), 6413 /*PrevDecl=*/0); 6414 getStdNamespace()->setImplicit(true); 6415 } 6416 6417 return getStdNamespace(); 6418} 6419 6420bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 6421 assert(getLangOpts().CPlusPlus && 6422 "Looking for std::initializer_list outside of C++."); 6423 6424 // We're looking for implicit instantiations of 6425 // template <typename E> class std::initializer_list. 6426 6427 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 6428 return false; 6429 6430 ClassTemplateDecl *Template = 0; 6431 const TemplateArgument *Arguments = 0; 6432 6433 if (const RecordType *RT = Ty->getAs<RecordType>()) { 6434 6435 ClassTemplateSpecializationDecl *Specialization = 6436 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 6437 if (!Specialization) 6438 return false; 6439 6440 Template = Specialization->getSpecializedTemplate(); 6441 Arguments = Specialization->getTemplateArgs().data(); 6442 } else if (const TemplateSpecializationType *TST = 6443 Ty->getAs<TemplateSpecializationType>()) { 6444 Template = dyn_cast_or_null<ClassTemplateDecl>( 6445 TST->getTemplateName().getAsTemplateDecl()); 6446 Arguments = TST->getArgs(); 6447 } 6448 if (!Template) 6449 return false; 6450 6451 if (!StdInitializerList) { 6452 // Haven't recognized std::initializer_list yet, maybe this is it. 6453 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 6454 if (TemplateClass->getIdentifier() != 6455 &PP.getIdentifierTable().get("initializer_list") || 6456 !getStdNamespace()->InEnclosingNamespaceSetOf( 6457 TemplateClass->getDeclContext())) 6458 return false; 6459 // This is a template called std::initializer_list, but is it the right 6460 // template? 6461 TemplateParameterList *Params = Template->getTemplateParameters(); 6462 if (Params->getMinRequiredArguments() != 1) 6463 return false; 6464 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 6465 return false; 6466 6467 // It's the right template. 6468 StdInitializerList = Template; 6469 } 6470 6471 if (Template != StdInitializerList) 6472 return false; 6473 6474 // This is an instance of std::initializer_list. Find the argument type. 6475 if (Element) 6476 *Element = Arguments[0].getAsType(); 6477 return true; 6478} 6479 6480static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 6481 NamespaceDecl *Std = S.getStdNamespace(); 6482 if (!Std) { 6483 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6484 return 0; 6485 } 6486 6487 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 6488 Loc, Sema::LookupOrdinaryName); 6489 if (!S.LookupQualifiedName(Result, Std)) { 6490 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6491 return 0; 6492 } 6493 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 6494 if (!Template) { 6495 Result.suppressDiagnostics(); 6496 // We found something weird. Complain about the first thing we found. 6497 NamedDecl *Found = *Result.begin(); 6498 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 6499 return 0; 6500 } 6501 6502 // We found some template called std::initializer_list. Now verify that it's 6503 // correct. 6504 TemplateParameterList *Params = Template->getTemplateParameters(); 6505 if (Params->getMinRequiredArguments() != 1 || 6506 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 6507 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 6508 return 0; 6509 } 6510 6511 return Template; 6512} 6513 6514QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 6515 if (!StdInitializerList) { 6516 StdInitializerList = LookupStdInitializerList(*this, Loc); 6517 if (!StdInitializerList) 6518 return QualType(); 6519 } 6520 6521 TemplateArgumentListInfo Args(Loc, Loc); 6522 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 6523 Context.getTrivialTypeSourceInfo(Element, 6524 Loc))); 6525 return Context.getCanonicalType( 6526 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 6527} 6528 6529bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 6530 // C++ [dcl.init.list]p2: 6531 // A constructor is an initializer-list constructor if its first parameter 6532 // is of type std::initializer_list<E> or reference to possibly cv-qualified 6533 // std::initializer_list<E> for some type E, and either there are no other 6534 // parameters or else all other parameters have default arguments. 6535 if (Ctor->getNumParams() < 1 || 6536 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 6537 return false; 6538 6539 QualType ArgType = Ctor->getParamDecl(0)->getType(); 6540 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 6541 ArgType = RT->getPointeeType().getUnqualifiedType(); 6542 6543 return isStdInitializerList(ArgType, 0); 6544} 6545 6546/// \brief Determine whether a using statement is in a context where it will be 6547/// apply in all contexts. 6548static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 6549 switch (CurContext->getDeclKind()) { 6550 case Decl::TranslationUnit: 6551 return true; 6552 case Decl::LinkageSpec: 6553 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 6554 default: 6555 return false; 6556 } 6557} 6558 6559namespace { 6560 6561// Callback to only accept typo corrections that are namespaces. 6562class NamespaceValidatorCCC : public CorrectionCandidateCallback { 6563 public: 6564 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 6565 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 6566 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 6567 } 6568 return false; 6569 } 6570}; 6571 6572} 6573 6574static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 6575 CXXScopeSpec &SS, 6576 SourceLocation IdentLoc, 6577 IdentifierInfo *Ident) { 6578 NamespaceValidatorCCC Validator; 6579 R.clear(); 6580 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 6581 R.getLookupKind(), Sc, &SS, 6582 Validator)) { 6583 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 6584 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 6585 if (DeclContext *DC = S.computeDeclContext(SS, false)) 6586 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 6587 << Ident << DC << CorrectedQuotedStr << SS.getRange() 6588 << FixItHint::CreateReplacement(Corrected.getCorrectionRange(), 6589 CorrectedStr); 6590 else 6591 S.Diag(IdentLoc, diag::err_using_directive_suggest) 6592 << Ident << CorrectedQuotedStr 6593 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 6594 6595 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 6596 diag::note_namespace_defined_here) << CorrectedQuotedStr; 6597 6598 R.addDecl(Corrected.getCorrectionDecl()); 6599 return true; 6600 } 6601 return false; 6602} 6603 6604Decl *Sema::ActOnUsingDirective(Scope *S, 6605 SourceLocation UsingLoc, 6606 SourceLocation NamespcLoc, 6607 CXXScopeSpec &SS, 6608 SourceLocation IdentLoc, 6609 IdentifierInfo *NamespcName, 6610 AttributeList *AttrList) { 6611 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6612 assert(NamespcName && "Invalid NamespcName."); 6613 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 6614 6615 // This can only happen along a recovery path. 6616 while (S->getFlags() & Scope::TemplateParamScope) 6617 S = S->getParent(); 6618 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6619 6620 UsingDirectiveDecl *UDir = 0; 6621 NestedNameSpecifier *Qualifier = 0; 6622 if (SS.isSet()) 6623 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 6624 6625 // Lookup namespace name. 6626 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 6627 LookupParsedName(R, S, &SS); 6628 if (R.isAmbiguous()) 6629 return 0; 6630 6631 if (R.empty()) { 6632 R.clear(); 6633 // Allow "using namespace std;" or "using namespace ::std;" even if 6634 // "std" hasn't been defined yet, for GCC compatibility. 6635 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 6636 NamespcName->isStr("std")) { 6637 Diag(IdentLoc, diag::ext_using_undefined_std); 6638 R.addDecl(getOrCreateStdNamespace()); 6639 R.resolveKind(); 6640 } 6641 // Otherwise, attempt typo correction. 6642 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 6643 } 6644 6645 if (!R.empty()) { 6646 NamedDecl *Named = R.getFoundDecl(); 6647 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 6648 && "expected namespace decl"); 6649 // C++ [namespace.udir]p1: 6650 // A using-directive specifies that the names in the nominated 6651 // namespace can be used in the scope in which the 6652 // using-directive appears after the using-directive. During 6653 // unqualified name lookup (3.4.1), the names appear as if they 6654 // were declared in the nearest enclosing namespace which 6655 // contains both the using-directive and the nominated 6656 // namespace. [Note: in this context, "contains" means "contains 6657 // directly or indirectly". ] 6658 6659 // Find enclosing context containing both using-directive and 6660 // nominated namespace. 6661 NamespaceDecl *NS = getNamespaceDecl(Named); 6662 DeclContext *CommonAncestor = cast<DeclContext>(NS); 6663 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 6664 CommonAncestor = CommonAncestor->getParent(); 6665 6666 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 6667 SS.getWithLocInContext(Context), 6668 IdentLoc, Named, CommonAncestor); 6669 6670 if (IsUsingDirectiveInToplevelContext(CurContext) && 6671 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 6672 Diag(IdentLoc, diag::warn_using_directive_in_header); 6673 } 6674 6675 PushUsingDirective(S, UDir); 6676 } else { 6677 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6678 } 6679 6680 if (UDir) 6681 ProcessDeclAttributeList(S, UDir, AttrList); 6682 6683 return UDir; 6684} 6685 6686void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 6687 // If the scope has an associated entity and the using directive is at 6688 // namespace or translation unit scope, add the UsingDirectiveDecl into 6689 // its lookup structure so qualified name lookup can find it. 6690 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 6691 if (Ctx && !Ctx->isFunctionOrMethod()) 6692 Ctx->addDecl(UDir); 6693 else 6694 // Otherwise, it is at block sope. The using-directives will affect lookup 6695 // only to the end of the scope. 6696 S->PushUsingDirective(UDir); 6697} 6698 6699 6700Decl *Sema::ActOnUsingDeclaration(Scope *S, 6701 AccessSpecifier AS, 6702 bool HasUsingKeyword, 6703 SourceLocation UsingLoc, 6704 CXXScopeSpec &SS, 6705 UnqualifiedId &Name, 6706 AttributeList *AttrList, 6707 bool IsTypeName, 6708 SourceLocation TypenameLoc) { 6709 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6710 6711 switch (Name.getKind()) { 6712 case UnqualifiedId::IK_ImplicitSelfParam: 6713 case UnqualifiedId::IK_Identifier: 6714 case UnqualifiedId::IK_OperatorFunctionId: 6715 case UnqualifiedId::IK_LiteralOperatorId: 6716 case UnqualifiedId::IK_ConversionFunctionId: 6717 break; 6718 6719 case UnqualifiedId::IK_ConstructorName: 6720 case UnqualifiedId::IK_ConstructorTemplateId: 6721 // C++11 inheriting constructors. 6722 Diag(Name.getLocStart(), 6723 getLangOpts().CPlusPlus11 ? 6724 diag::warn_cxx98_compat_using_decl_constructor : 6725 diag::err_using_decl_constructor) 6726 << SS.getRange(); 6727 6728 if (getLangOpts().CPlusPlus11) break; 6729 6730 return 0; 6731 6732 case UnqualifiedId::IK_DestructorName: 6733 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 6734 << SS.getRange(); 6735 return 0; 6736 6737 case UnqualifiedId::IK_TemplateId: 6738 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 6739 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 6740 return 0; 6741 } 6742 6743 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 6744 DeclarationName TargetName = TargetNameInfo.getName(); 6745 if (!TargetName) 6746 return 0; 6747 6748 // Warn about access declarations. 6749 // TODO: store that the declaration was written without 'using' and 6750 // talk about access decls instead of using decls in the 6751 // diagnostics. 6752 if (!HasUsingKeyword) { 6753 UsingLoc = Name.getLocStart(); 6754 6755 Diag(UsingLoc, diag::warn_access_decl_deprecated) 6756 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 6757 } 6758 6759 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 6760 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 6761 return 0; 6762 6763 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 6764 TargetNameInfo, AttrList, 6765 /* IsInstantiation */ false, 6766 IsTypeName, TypenameLoc); 6767 if (UD) 6768 PushOnScopeChains(UD, S, /*AddToContext*/ false); 6769 6770 return UD; 6771} 6772 6773/// \brief Determine whether a using declaration considers the given 6774/// declarations as "equivalent", e.g., if they are redeclarations of 6775/// the same entity or are both typedefs of the same type. 6776static bool 6777IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 6778 bool &SuppressRedeclaration) { 6779 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 6780 SuppressRedeclaration = false; 6781 return true; 6782 } 6783 6784 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 6785 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6786 SuppressRedeclaration = true; 6787 return Context.hasSameType(TD1->getUnderlyingType(), 6788 TD2->getUnderlyingType()); 6789 } 6790 6791 return false; 6792} 6793 6794 6795/// Determines whether to create a using shadow decl for a particular 6796/// decl, given the set of decls existing prior to this using lookup. 6797bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6798 const LookupResult &Previous) { 6799 // Diagnose finding a decl which is not from a base class of the 6800 // current class. We do this now because there are cases where this 6801 // function will silently decide not to build a shadow decl, which 6802 // will pre-empt further diagnostics. 6803 // 6804 // We don't need to do this in C++0x because we do the check once on 6805 // the qualifier. 6806 // 6807 // FIXME: diagnose the following if we care enough: 6808 // struct A { int foo; }; 6809 // struct B : A { using A::foo; }; 6810 // template <class T> struct C : A {}; 6811 // template <class T> struct D : C<T> { using B::foo; } // <--- 6812 // This is invalid (during instantiation) in C++03 because B::foo 6813 // resolves to the using decl in B, which is not a base class of D<T>. 6814 // We can't diagnose it immediately because C<T> is an unknown 6815 // specialization. The UsingShadowDecl in D<T> then points directly 6816 // to A::foo, which will look well-formed when we instantiate. 6817 // The right solution is to not collapse the shadow-decl chain. 6818 if (!getLangOpts().CPlusPlus11 && CurContext->isRecord()) { 6819 DeclContext *OrigDC = Orig->getDeclContext(); 6820 6821 // Handle enums and anonymous structs. 6822 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6823 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6824 while (OrigRec->isAnonymousStructOrUnion()) 6825 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6826 6827 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6828 if (OrigDC == CurContext) { 6829 Diag(Using->getLocation(), 6830 diag::err_using_decl_nested_name_specifier_is_current_class) 6831 << Using->getQualifierLoc().getSourceRange(); 6832 Diag(Orig->getLocation(), diag::note_using_decl_target); 6833 return true; 6834 } 6835 6836 Diag(Using->getQualifierLoc().getBeginLoc(), 6837 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6838 << Using->getQualifier() 6839 << cast<CXXRecordDecl>(CurContext) 6840 << Using->getQualifierLoc().getSourceRange(); 6841 Diag(Orig->getLocation(), diag::note_using_decl_target); 6842 return true; 6843 } 6844 } 6845 6846 if (Previous.empty()) return false; 6847 6848 NamedDecl *Target = Orig; 6849 if (isa<UsingShadowDecl>(Target)) 6850 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6851 6852 // If the target happens to be one of the previous declarations, we 6853 // don't have a conflict. 6854 // 6855 // FIXME: but we might be increasing its access, in which case we 6856 // should redeclare it. 6857 NamedDecl *NonTag = 0, *Tag = 0; 6858 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6859 I != E; ++I) { 6860 NamedDecl *D = (*I)->getUnderlyingDecl(); 6861 bool Result; 6862 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6863 return Result; 6864 6865 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6866 } 6867 6868 if (Target->isFunctionOrFunctionTemplate()) { 6869 FunctionDecl *FD; 6870 if (isa<FunctionTemplateDecl>(Target)) 6871 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6872 else 6873 FD = cast<FunctionDecl>(Target); 6874 6875 NamedDecl *OldDecl = 0; 6876 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6877 case Ovl_Overload: 6878 return false; 6879 6880 case Ovl_NonFunction: 6881 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6882 break; 6883 6884 // We found a decl with the exact signature. 6885 case Ovl_Match: 6886 // If we're in a record, we want to hide the target, so we 6887 // return true (without a diagnostic) to tell the caller not to 6888 // build a shadow decl. 6889 if (CurContext->isRecord()) 6890 return true; 6891 6892 // If we're not in a record, this is an error. 6893 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6894 break; 6895 } 6896 6897 Diag(Target->getLocation(), diag::note_using_decl_target); 6898 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6899 return true; 6900 } 6901 6902 // Target is not a function. 6903 6904 if (isa<TagDecl>(Target)) { 6905 // No conflict between a tag and a non-tag. 6906 if (!Tag) return false; 6907 6908 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6909 Diag(Target->getLocation(), diag::note_using_decl_target); 6910 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6911 return true; 6912 } 6913 6914 // No conflict between a tag and a non-tag. 6915 if (!NonTag) return false; 6916 6917 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6918 Diag(Target->getLocation(), diag::note_using_decl_target); 6919 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6920 return true; 6921} 6922 6923/// Builds a shadow declaration corresponding to a 'using' declaration. 6924UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6925 UsingDecl *UD, 6926 NamedDecl *Orig) { 6927 6928 // If we resolved to another shadow declaration, just coalesce them. 6929 NamedDecl *Target = Orig; 6930 if (isa<UsingShadowDecl>(Target)) { 6931 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6932 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6933 } 6934 6935 UsingShadowDecl *Shadow 6936 = UsingShadowDecl::Create(Context, CurContext, 6937 UD->getLocation(), UD, Target); 6938 UD->addShadowDecl(Shadow); 6939 6940 Shadow->setAccess(UD->getAccess()); 6941 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6942 Shadow->setInvalidDecl(); 6943 6944 if (S) 6945 PushOnScopeChains(Shadow, S); 6946 else 6947 CurContext->addDecl(Shadow); 6948 6949 6950 return Shadow; 6951} 6952 6953/// Hides a using shadow declaration. This is required by the current 6954/// using-decl implementation when a resolvable using declaration in a 6955/// class is followed by a declaration which would hide or override 6956/// one or more of the using decl's targets; for example: 6957/// 6958/// struct Base { void foo(int); }; 6959/// struct Derived : Base { 6960/// using Base::foo; 6961/// void foo(int); 6962/// }; 6963/// 6964/// The governing language is C++03 [namespace.udecl]p12: 6965/// 6966/// When a using-declaration brings names from a base class into a 6967/// derived class scope, member functions in the derived class 6968/// override and/or hide member functions with the same name and 6969/// parameter types in a base class (rather than conflicting). 6970/// 6971/// There are two ways to implement this: 6972/// (1) optimistically create shadow decls when they're not hidden 6973/// by existing declarations, or 6974/// (2) don't create any shadow decls (or at least don't make them 6975/// visible) until we've fully parsed/instantiated the class. 6976/// The problem with (1) is that we might have to retroactively remove 6977/// a shadow decl, which requires several O(n) operations because the 6978/// decl structures are (very reasonably) not designed for removal. 6979/// (2) avoids this but is very fiddly and phase-dependent. 6980void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6981 if (Shadow->getDeclName().getNameKind() == 6982 DeclarationName::CXXConversionFunctionName) 6983 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6984 6985 // Remove it from the DeclContext... 6986 Shadow->getDeclContext()->removeDecl(Shadow); 6987 6988 // ...and the scope, if applicable... 6989 if (S) { 6990 S->RemoveDecl(Shadow); 6991 IdResolver.RemoveDecl(Shadow); 6992 } 6993 6994 // ...and the using decl. 6995 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6996 6997 // TODO: complain somehow if Shadow was used. It shouldn't 6998 // be possible for this to happen, because...? 6999} 7000 7001/// Builds a using declaration. 7002/// 7003/// \param IsInstantiation - Whether this call arises from an 7004/// instantiation of an unresolved using declaration. We treat 7005/// the lookup differently for these declarations. 7006NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 7007 SourceLocation UsingLoc, 7008 CXXScopeSpec &SS, 7009 const DeclarationNameInfo &NameInfo, 7010 AttributeList *AttrList, 7011 bool IsInstantiation, 7012 bool IsTypeName, 7013 SourceLocation TypenameLoc) { 7014 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 7015 SourceLocation IdentLoc = NameInfo.getLoc(); 7016 assert(IdentLoc.isValid() && "Invalid TargetName location."); 7017 7018 // FIXME: We ignore attributes for now. 7019 7020 if (SS.isEmpty()) { 7021 Diag(IdentLoc, diag::err_using_requires_qualname); 7022 return 0; 7023 } 7024 7025 // Do the redeclaration lookup in the current scope. 7026 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 7027 ForRedeclaration); 7028 Previous.setHideTags(false); 7029 if (S) { 7030 LookupName(Previous, S); 7031 7032 // It is really dumb that we have to do this. 7033 LookupResult::Filter F = Previous.makeFilter(); 7034 while (F.hasNext()) { 7035 NamedDecl *D = F.next(); 7036 if (!isDeclInScope(D, CurContext, S)) 7037 F.erase(); 7038 } 7039 F.done(); 7040 } else { 7041 assert(IsInstantiation && "no scope in non-instantiation"); 7042 assert(CurContext->isRecord() && "scope not record in instantiation"); 7043 LookupQualifiedName(Previous, CurContext); 7044 } 7045 7046 // Check for invalid redeclarations. 7047 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 7048 return 0; 7049 7050 // Check for bad qualifiers. 7051 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 7052 return 0; 7053 7054 DeclContext *LookupContext = computeDeclContext(SS); 7055 NamedDecl *D; 7056 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 7057 if (!LookupContext) { 7058 if (IsTypeName) { 7059 // FIXME: not all declaration name kinds are legal here 7060 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 7061 UsingLoc, TypenameLoc, 7062 QualifierLoc, 7063 IdentLoc, NameInfo.getName()); 7064 } else { 7065 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 7066 QualifierLoc, NameInfo); 7067 } 7068 } else { 7069 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 7070 NameInfo, IsTypeName); 7071 } 7072 D->setAccess(AS); 7073 CurContext->addDecl(D); 7074 7075 if (!LookupContext) return D; 7076 UsingDecl *UD = cast<UsingDecl>(D); 7077 7078 if (RequireCompleteDeclContext(SS, LookupContext)) { 7079 UD->setInvalidDecl(); 7080 return UD; 7081 } 7082 7083 // The normal rules do not apply to inheriting constructor declarations. 7084 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 7085 if (CheckInheritingConstructorUsingDecl(UD)) 7086 UD->setInvalidDecl(); 7087 return UD; 7088 } 7089 7090 // Otherwise, look up the target name. 7091 7092 LookupResult R(*this, NameInfo, LookupOrdinaryName); 7093 7094 // Unlike most lookups, we don't always want to hide tag 7095 // declarations: tag names are visible through the using declaration 7096 // even if hidden by ordinary names, *except* in a dependent context 7097 // where it's important for the sanity of two-phase lookup. 7098 if (!IsInstantiation) 7099 R.setHideTags(false); 7100 7101 // For the purposes of this lookup, we have a base object type 7102 // equal to that of the current context. 7103 if (CurContext->isRecord()) { 7104 R.setBaseObjectType( 7105 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 7106 } 7107 7108 LookupQualifiedName(R, LookupContext); 7109 7110 if (R.empty()) { 7111 Diag(IdentLoc, diag::err_no_member) 7112 << NameInfo.getName() << LookupContext << SS.getRange(); 7113 UD->setInvalidDecl(); 7114 return UD; 7115 } 7116 7117 if (R.isAmbiguous()) { 7118 UD->setInvalidDecl(); 7119 return UD; 7120 } 7121 7122 if (IsTypeName) { 7123 // If we asked for a typename and got a non-type decl, error out. 7124 if (!R.getAsSingle<TypeDecl>()) { 7125 Diag(IdentLoc, diag::err_using_typename_non_type); 7126 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 7127 Diag((*I)->getUnderlyingDecl()->getLocation(), 7128 diag::note_using_decl_target); 7129 UD->setInvalidDecl(); 7130 return UD; 7131 } 7132 } else { 7133 // If we asked for a non-typename and we got a type, error out, 7134 // but only if this is an instantiation of an unresolved using 7135 // decl. Otherwise just silently find the type name. 7136 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 7137 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 7138 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 7139 UD->setInvalidDecl(); 7140 return UD; 7141 } 7142 } 7143 7144 // C++0x N2914 [namespace.udecl]p6: 7145 // A using-declaration shall not name a namespace. 7146 if (R.getAsSingle<NamespaceDecl>()) { 7147 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 7148 << SS.getRange(); 7149 UD->setInvalidDecl(); 7150 return UD; 7151 } 7152 7153 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 7154 if (!CheckUsingShadowDecl(UD, *I, Previous)) 7155 BuildUsingShadowDecl(S, UD, *I); 7156 } 7157 7158 return UD; 7159} 7160 7161/// Additional checks for a using declaration referring to a constructor name. 7162bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 7163 assert(!UD->isTypeName() && "expecting a constructor name"); 7164 7165 const Type *SourceType = UD->getQualifier()->getAsType(); 7166 assert(SourceType && 7167 "Using decl naming constructor doesn't have type in scope spec."); 7168 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 7169 7170 // Check whether the named type is a direct base class. 7171 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 7172 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 7173 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 7174 BaseIt != BaseE; ++BaseIt) { 7175 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 7176 if (CanonicalSourceType == BaseType) 7177 break; 7178 if (BaseIt->getType()->isDependentType()) 7179 break; 7180 } 7181 7182 if (BaseIt == BaseE) { 7183 // Did not find SourceType in the bases. 7184 Diag(UD->getUsingLocation(), 7185 diag::err_using_decl_constructor_not_in_direct_base) 7186 << UD->getNameInfo().getSourceRange() 7187 << QualType(SourceType, 0) << TargetClass; 7188 return true; 7189 } 7190 7191 if (!CurContext->isDependentContext()) 7192 BaseIt->setInheritConstructors(); 7193 7194 return false; 7195} 7196 7197/// Checks that the given using declaration is not an invalid 7198/// redeclaration. Note that this is checking only for the using decl 7199/// itself, not for any ill-formedness among the UsingShadowDecls. 7200bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 7201 bool isTypeName, 7202 const CXXScopeSpec &SS, 7203 SourceLocation NameLoc, 7204 const LookupResult &Prev) { 7205 // C++03 [namespace.udecl]p8: 7206 // C++0x [namespace.udecl]p10: 7207 // A using-declaration is a declaration and can therefore be used 7208 // repeatedly where (and only where) multiple declarations are 7209 // allowed. 7210 // 7211 // That's in non-member contexts. 7212 if (!CurContext->getRedeclContext()->isRecord()) 7213 return false; 7214 7215 NestedNameSpecifier *Qual 7216 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 7217 7218 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 7219 NamedDecl *D = *I; 7220 7221 bool DTypename; 7222 NestedNameSpecifier *DQual; 7223 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 7224 DTypename = UD->isTypeName(); 7225 DQual = UD->getQualifier(); 7226 } else if (UnresolvedUsingValueDecl *UD 7227 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 7228 DTypename = false; 7229 DQual = UD->getQualifier(); 7230 } else if (UnresolvedUsingTypenameDecl *UD 7231 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 7232 DTypename = true; 7233 DQual = UD->getQualifier(); 7234 } else continue; 7235 7236 // using decls differ if one says 'typename' and the other doesn't. 7237 // FIXME: non-dependent using decls? 7238 if (isTypeName != DTypename) continue; 7239 7240 // using decls differ if they name different scopes (but note that 7241 // template instantiation can cause this check to trigger when it 7242 // didn't before instantiation). 7243 if (Context.getCanonicalNestedNameSpecifier(Qual) != 7244 Context.getCanonicalNestedNameSpecifier(DQual)) 7245 continue; 7246 7247 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 7248 Diag(D->getLocation(), diag::note_using_decl) << 1; 7249 return true; 7250 } 7251 7252 return false; 7253} 7254 7255 7256/// Checks that the given nested-name qualifier used in a using decl 7257/// in the current context is appropriately related to the current 7258/// scope. If an error is found, diagnoses it and returns true. 7259bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 7260 const CXXScopeSpec &SS, 7261 SourceLocation NameLoc) { 7262 DeclContext *NamedContext = computeDeclContext(SS); 7263 7264 if (!CurContext->isRecord()) { 7265 // C++03 [namespace.udecl]p3: 7266 // C++0x [namespace.udecl]p8: 7267 // A using-declaration for a class member shall be a member-declaration. 7268 7269 // If we weren't able to compute a valid scope, it must be a 7270 // dependent class scope. 7271 if (!NamedContext || NamedContext->isRecord()) { 7272 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 7273 << SS.getRange(); 7274 return true; 7275 } 7276 7277 // Otherwise, everything is known to be fine. 7278 return false; 7279 } 7280 7281 // The current scope is a record. 7282 7283 // If the named context is dependent, we can't decide much. 7284 if (!NamedContext) { 7285 // FIXME: in C++0x, we can diagnose if we can prove that the 7286 // nested-name-specifier does not refer to a base class, which is 7287 // still possible in some cases. 7288 7289 // Otherwise we have to conservatively report that things might be 7290 // okay. 7291 return false; 7292 } 7293 7294 if (!NamedContext->isRecord()) { 7295 // Ideally this would point at the last name in the specifier, 7296 // but we don't have that level of source info. 7297 Diag(SS.getRange().getBegin(), 7298 diag::err_using_decl_nested_name_specifier_is_not_class) 7299 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 7300 return true; 7301 } 7302 7303 if (!NamedContext->isDependentContext() && 7304 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 7305 return true; 7306 7307 if (getLangOpts().CPlusPlus11) { 7308 // C++0x [namespace.udecl]p3: 7309 // In a using-declaration used as a member-declaration, the 7310 // nested-name-specifier shall name a base class of the class 7311 // being defined. 7312 7313 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 7314 cast<CXXRecordDecl>(NamedContext))) { 7315 if (CurContext == NamedContext) { 7316 Diag(NameLoc, 7317 diag::err_using_decl_nested_name_specifier_is_current_class) 7318 << SS.getRange(); 7319 return true; 7320 } 7321 7322 Diag(SS.getRange().getBegin(), 7323 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7324 << (NestedNameSpecifier*) SS.getScopeRep() 7325 << cast<CXXRecordDecl>(CurContext) 7326 << SS.getRange(); 7327 return true; 7328 } 7329 7330 return false; 7331 } 7332 7333 // C++03 [namespace.udecl]p4: 7334 // A using-declaration used as a member-declaration shall refer 7335 // to a member of a base class of the class being defined [etc.]. 7336 7337 // Salient point: SS doesn't have to name a base class as long as 7338 // lookup only finds members from base classes. Therefore we can 7339 // diagnose here only if we can prove that that can't happen, 7340 // i.e. if the class hierarchies provably don't intersect. 7341 7342 // TODO: it would be nice if "definitely valid" results were cached 7343 // in the UsingDecl and UsingShadowDecl so that these checks didn't 7344 // need to be repeated. 7345 7346 struct UserData { 7347 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 7348 7349 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 7350 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7351 Data->Bases.insert(Base); 7352 return true; 7353 } 7354 7355 bool hasDependentBases(const CXXRecordDecl *Class) { 7356 return !Class->forallBases(collect, this); 7357 } 7358 7359 /// Returns true if the base is dependent or is one of the 7360 /// accumulated base classes. 7361 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 7362 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7363 return !Data->Bases.count(Base); 7364 } 7365 7366 bool mightShareBases(const CXXRecordDecl *Class) { 7367 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 7368 } 7369 }; 7370 7371 UserData Data; 7372 7373 // Returns false if we find a dependent base. 7374 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 7375 return false; 7376 7377 // Returns false if the class has a dependent base or if it or one 7378 // of its bases is present in the base set of the current context. 7379 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 7380 return false; 7381 7382 Diag(SS.getRange().getBegin(), 7383 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7384 << (NestedNameSpecifier*) SS.getScopeRep() 7385 << cast<CXXRecordDecl>(CurContext) 7386 << SS.getRange(); 7387 7388 return true; 7389} 7390 7391Decl *Sema::ActOnAliasDeclaration(Scope *S, 7392 AccessSpecifier AS, 7393 MultiTemplateParamsArg TemplateParamLists, 7394 SourceLocation UsingLoc, 7395 UnqualifiedId &Name, 7396 AttributeList *AttrList, 7397 TypeResult Type) { 7398 // Skip up to the relevant declaration scope. 7399 while (S->getFlags() & Scope::TemplateParamScope) 7400 S = S->getParent(); 7401 assert((S->getFlags() & Scope::DeclScope) && 7402 "got alias-declaration outside of declaration scope"); 7403 7404 if (Type.isInvalid()) 7405 return 0; 7406 7407 bool Invalid = false; 7408 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 7409 TypeSourceInfo *TInfo = 0; 7410 GetTypeFromParser(Type.get(), &TInfo); 7411 7412 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 7413 return 0; 7414 7415 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 7416 UPPC_DeclarationType)) { 7417 Invalid = true; 7418 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 7419 TInfo->getTypeLoc().getBeginLoc()); 7420 } 7421 7422 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 7423 LookupName(Previous, S); 7424 7425 // Warn about shadowing the name of a template parameter. 7426 if (Previous.isSingleResult() && 7427 Previous.getFoundDecl()->isTemplateParameter()) { 7428 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 7429 Previous.clear(); 7430 } 7431 7432 assert(Name.Kind == UnqualifiedId::IK_Identifier && 7433 "name in alias declaration must be an identifier"); 7434 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 7435 Name.StartLocation, 7436 Name.Identifier, TInfo); 7437 7438 NewTD->setAccess(AS); 7439 7440 if (Invalid) 7441 NewTD->setInvalidDecl(); 7442 7443 ProcessDeclAttributeList(S, NewTD, AttrList); 7444 7445 CheckTypedefForVariablyModifiedType(S, NewTD); 7446 Invalid |= NewTD->isInvalidDecl(); 7447 7448 bool Redeclaration = false; 7449 7450 NamedDecl *NewND; 7451 if (TemplateParamLists.size()) { 7452 TypeAliasTemplateDecl *OldDecl = 0; 7453 TemplateParameterList *OldTemplateParams = 0; 7454 7455 if (TemplateParamLists.size() != 1) { 7456 Diag(UsingLoc, diag::err_alias_template_extra_headers) 7457 << SourceRange(TemplateParamLists[1]->getTemplateLoc(), 7458 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); 7459 } 7460 TemplateParameterList *TemplateParams = TemplateParamLists[0]; 7461 7462 // Only consider previous declarations in the same scope. 7463 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 7464 /*ExplicitInstantiationOrSpecialization*/false); 7465 if (!Previous.empty()) { 7466 Redeclaration = true; 7467 7468 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 7469 if (!OldDecl && !Invalid) { 7470 Diag(UsingLoc, diag::err_redefinition_different_kind) 7471 << Name.Identifier; 7472 7473 NamedDecl *OldD = Previous.getRepresentativeDecl(); 7474 if (OldD->getLocation().isValid()) 7475 Diag(OldD->getLocation(), diag::note_previous_definition); 7476 7477 Invalid = true; 7478 } 7479 7480 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 7481 if (TemplateParameterListsAreEqual(TemplateParams, 7482 OldDecl->getTemplateParameters(), 7483 /*Complain=*/true, 7484 TPL_TemplateMatch)) 7485 OldTemplateParams = OldDecl->getTemplateParameters(); 7486 else 7487 Invalid = true; 7488 7489 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 7490 if (!Invalid && 7491 !Context.hasSameType(OldTD->getUnderlyingType(), 7492 NewTD->getUnderlyingType())) { 7493 // FIXME: The C++0x standard does not clearly say this is ill-formed, 7494 // but we can't reasonably accept it. 7495 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 7496 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 7497 if (OldTD->getLocation().isValid()) 7498 Diag(OldTD->getLocation(), diag::note_previous_definition); 7499 Invalid = true; 7500 } 7501 } 7502 } 7503 7504 // Merge any previous default template arguments into our parameters, 7505 // and check the parameter list. 7506 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 7507 TPC_TypeAliasTemplate)) 7508 return 0; 7509 7510 TypeAliasTemplateDecl *NewDecl = 7511 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 7512 Name.Identifier, TemplateParams, 7513 NewTD); 7514 7515 NewDecl->setAccess(AS); 7516 7517 if (Invalid) 7518 NewDecl->setInvalidDecl(); 7519 else if (OldDecl) 7520 NewDecl->setPreviousDeclaration(OldDecl); 7521 7522 NewND = NewDecl; 7523 } else { 7524 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 7525 NewND = NewTD; 7526 } 7527 7528 if (!Redeclaration) 7529 PushOnScopeChains(NewND, S); 7530 7531 ActOnDocumentableDecl(NewND); 7532 return NewND; 7533} 7534 7535Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 7536 SourceLocation NamespaceLoc, 7537 SourceLocation AliasLoc, 7538 IdentifierInfo *Alias, 7539 CXXScopeSpec &SS, 7540 SourceLocation IdentLoc, 7541 IdentifierInfo *Ident) { 7542 7543 // Lookup the namespace name. 7544 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 7545 LookupParsedName(R, S, &SS); 7546 7547 // Check if we have a previous declaration with the same name. 7548 NamedDecl *PrevDecl 7549 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 7550 ForRedeclaration); 7551 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 7552 PrevDecl = 0; 7553 7554 if (PrevDecl) { 7555 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 7556 // We already have an alias with the same name that points to the same 7557 // namespace, so don't create a new one. 7558 // FIXME: At some point, we'll want to create the (redundant) 7559 // declaration to maintain better source information. 7560 if (!R.isAmbiguous() && !R.empty() && 7561 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 7562 return 0; 7563 } 7564 7565 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 7566 diag::err_redefinition_different_kind; 7567 Diag(AliasLoc, DiagID) << Alias; 7568 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7569 return 0; 7570 } 7571 7572 if (R.isAmbiguous()) 7573 return 0; 7574 7575 if (R.empty()) { 7576 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 7577 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 7578 return 0; 7579 } 7580 } 7581 7582 NamespaceAliasDecl *AliasDecl = 7583 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 7584 Alias, SS.getWithLocInContext(Context), 7585 IdentLoc, R.getFoundDecl()); 7586 7587 PushOnScopeChains(AliasDecl, S); 7588 return AliasDecl; 7589} 7590 7591Sema::ImplicitExceptionSpecification 7592Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 7593 CXXMethodDecl *MD) { 7594 CXXRecordDecl *ClassDecl = MD->getParent(); 7595 7596 // C++ [except.spec]p14: 7597 // An implicitly declared special member function (Clause 12) shall have an 7598 // exception-specification. [...] 7599 ImplicitExceptionSpecification ExceptSpec(*this); 7600 if (ClassDecl->isInvalidDecl()) 7601 return ExceptSpec; 7602 7603 // Direct base-class constructors. 7604 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7605 BEnd = ClassDecl->bases_end(); 7606 B != BEnd; ++B) { 7607 if (B->isVirtual()) // Handled below. 7608 continue; 7609 7610 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7611 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7612 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7613 // If this is a deleted function, add it anyway. This might be conformant 7614 // with the standard. This might not. I'm not sure. It might not matter. 7615 if (Constructor) 7616 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7617 } 7618 } 7619 7620 // Virtual base-class constructors. 7621 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7622 BEnd = ClassDecl->vbases_end(); 7623 B != BEnd; ++B) { 7624 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7625 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7626 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7627 // If this is a deleted function, add it anyway. This might be conformant 7628 // with the standard. This might not. I'm not sure. It might not matter. 7629 if (Constructor) 7630 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7631 } 7632 } 7633 7634 // Field constructors. 7635 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7636 FEnd = ClassDecl->field_end(); 7637 F != FEnd; ++F) { 7638 if (F->hasInClassInitializer()) { 7639 if (Expr *E = F->getInClassInitializer()) 7640 ExceptSpec.CalledExpr(E); 7641 else if (!F->isInvalidDecl()) 7642 // DR1351: 7643 // If the brace-or-equal-initializer of a non-static data member 7644 // invokes a defaulted default constructor of its class or of an 7645 // enclosing class in a potentially evaluated subexpression, the 7646 // program is ill-formed. 7647 // 7648 // This resolution is unworkable: the exception specification of the 7649 // default constructor can be needed in an unevaluated context, in 7650 // particular, in the operand of a noexcept-expression, and we can be 7651 // unable to compute an exception specification for an enclosed class. 7652 // 7653 // We do not allow an in-class initializer to require the evaluation 7654 // of the exception specification for any in-class initializer whose 7655 // definition is not lexically complete. 7656 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 7657 } else if (const RecordType *RecordTy 7658 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 7659 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7660 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 7661 // If this is a deleted function, add it anyway. This might be conformant 7662 // with the standard. This might not. I'm not sure. It might not matter. 7663 // In particular, the problem is that this function never gets called. It 7664 // might just be ill-formed because this function attempts to refer to 7665 // a deleted function here. 7666 if (Constructor) 7667 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 7668 } 7669 } 7670 7671 return ExceptSpec; 7672} 7673 7674Sema::ImplicitExceptionSpecification 7675Sema::ComputeInheritingCtorExceptionSpec(CXXConstructorDecl *CD) { 7676 CXXRecordDecl *ClassDecl = CD->getParent(); 7677 7678 // C++ [except.spec]p14: 7679 // An inheriting constructor [...] shall have an exception-specification. [...] 7680 ImplicitExceptionSpecification ExceptSpec(*this); 7681 if (ClassDecl->isInvalidDecl()) 7682 return ExceptSpec; 7683 7684 // Inherited constructor. 7685 const CXXConstructorDecl *InheritedCD = CD->getInheritedConstructor(); 7686 const CXXRecordDecl *InheritedDecl = InheritedCD->getParent(); 7687 // FIXME: Copying or moving the parameters could add extra exceptions to the 7688 // set, as could the default arguments for the inherited constructor. This 7689 // will be addressed when we implement the resolution of core issue 1351. 7690 ExceptSpec.CalledDecl(CD->getLocStart(), InheritedCD); 7691 7692 // Direct base-class constructors. 7693 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7694 BEnd = ClassDecl->bases_end(); 7695 B != BEnd; ++B) { 7696 if (B->isVirtual()) // Handled below. 7697 continue; 7698 7699 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7700 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7701 if (BaseClassDecl == InheritedDecl) 7702 continue; 7703 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7704 if (Constructor) 7705 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7706 } 7707 } 7708 7709 // Virtual base-class constructors. 7710 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7711 BEnd = ClassDecl->vbases_end(); 7712 B != BEnd; ++B) { 7713 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7714 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7715 if (BaseClassDecl == InheritedDecl) 7716 continue; 7717 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7718 if (Constructor) 7719 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7720 } 7721 } 7722 7723 // Field constructors. 7724 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7725 FEnd = ClassDecl->field_end(); 7726 F != FEnd; ++F) { 7727 if (F->hasInClassInitializer()) { 7728 if (Expr *E = F->getInClassInitializer()) 7729 ExceptSpec.CalledExpr(E); 7730 else if (!F->isInvalidDecl()) 7731 Diag(CD->getLocation(), 7732 diag::err_in_class_initializer_references_def_ctor) << CD; 7733 } else if (const RecordType *RecordTy 7734 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 7735 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7736 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 7737 if (Constructor) 7738 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 7739 } 7740 } 7741 7742 return ExceptSpec; 7743} 7744 7745namespace { 7746/// RAII object to register a special member as being currently declared. 7747struct DeclaringSpecialMember { 7748 Sema &S; 7749 Sema::SpecialMemberDecl D; 7750 bool WasAlreadyBeingDeclared; 7751 7752 DeclaringSpecialMember(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM) 7753 : S(S), D(RD, CSM) { 7754 WasAlreadyBeingDeclared = !S.SpecialMembersBeingDeclared.insert(D); 7755 if (WasAlreadyBeingDeclared) 7756 // This almost never happens, but if it does, ensure that our cache 7757 // doesn't contain a stale result. 7758 S.SpecialMemberCache.clear(); 7759 7760 // FIXME: Register a note to be produced if we encounter an error while 7761 // declaring the special member. 7762 } 7763 ~DeclaringSpecialMember() { 7764 if (!WasAlreadyBeingDeclared) 7765 S.SpecialMembersBeingDeclared.erase(D); 7766 } 7767 7768 /// \brief Are we already trying to declare this special member? 7769 bool isAlreadyBeingDeclared() const { 7770 return WasAlreadyBeingDeclared; 7771 } 7772}; 7773} 7774 7775CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 7776 CXXRecordDecl *ClassDecl) { 7777 // C++ [class.ctor]p5: 7778 // A default constructor for a class X is a constructor of class X 7779 // that can be called without an argument. If there is no 7780 // user-declared constructor for class X, a default constructor is 7781 // implicitly declared. An implicitly-declared default constructor 7782 // is an inline public member of its class. 7783 assert(ClassDecl->needsImplicitDefaultConstructor() && 7784 "Should not build implicit default constructor!"); 7785 7786 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDefaultConstructor); 7787 if (DSM.isAlreadyBeingDeclared()) 7788 return 0; 7789 7790 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 7791 CXXDefaultConstructor, 7792 false); 7793 7794 // Create the actual constructor declaration. 7795 CanQualType ClassType 7796 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7797 SourceLocation ClassLoc = ClassDecl->getLocation(); 7798 DeclarationName Name 7799 = Context.DeclarationNames.getCXXConstructorName(ClassType); 7800 DeclarationNameInfo NameInfo(Name, ClassLoc); 7801 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 7802 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 7803 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 7804 Constexpr); 7805 DefaultCon->setAccess(AS_public); 7806 DefaultCon->setDefaulted(); 7807 DefaultCon->setImplicit(); 7808 7809 // Build an exception specification pointing back at this constructor. 7810 FunctionProtoType::ExtProtoInfo EPI; 7811 EPI.ExceptionSpecType = EST_Unevaluated; 7812 EPI.ExceptionSpecDecl = DefaultCon; 7813 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, 7814 ArrayRef<QualType>(), 7815 EPI)); 7816 7817 // We don't need to use SpecialMemberIsTrivial here; triviality for default 7818 // constructors is easy to compute. 7819 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 7820 7821 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 7822 SetDeclDeleted(DefaultCon, ClassLoc); 7823 7824 // Note that we have declared this constructor. 7825 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 7826 7827 if (Scope *S = getScopeForContext(ClassDecl)) 7828 PushOnScopeChains(DefaultCon, S, false); 7829 ClassDecl->addDecl(DefaultCon); 7830 7831 return DefaultCon; 7832} 7833 7834void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 7835 CXXConstructorDecl *Constructor) { 7836 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 7837 !Constructor->doesThisDeclarationHaveABody() && 7838 !Constructor->isDeleted()) && 7839 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 7840 7841 CXXRecordDecl *ClassDecl = Constructor->getParent(); 7842 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 7843 7844 SynthesizedFunctionScope Scope(*this, Constructor); 7845 DiagnosticErrorTrap Trap(Diags); 7846 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) || 7847 Trap.hasErrorOccurred()) { 7848 Diag(CurrentLocation, diag::note_member_synthesized_at) 7849 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 7850 Constructor->setInvalidDecl(); 7851 return; 7852 } 7853 7854 SourceLocation Loc = Constructor->getLocation(); 7855 Constructor->setBody(new (Context) CompoundStmt(Loc)); 7856 7857 Constructor->setUsed(); 7858 MarkVTableUsed(CurrentLocation, ClassDecl); 7859 7860 if (ASTMutationListener *L = getASTMutationListener()) { 7861 L->CompletedImplicitDefinition(Constructor); 7862 } 7863} 7864 7865void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 7866 // Check that any explicitly-defaulted methods have exception specifications 7867 // compatible with their implicit exception specifications. 7868 CheckDelayedExplicitlyDefaultedMemberExceptionSpecs(); 7869} 7870 7871namespace { 7872/// Information on inheriting constructors to declare. 7873class InheritingConstructorInfo { 7874public: 7875 InheritingConstructorInfo(Sema &SemaRef, CXXRecordDecl *Derived) 7876 : SemaRef(SemaRef), Derived(Derived) { 7877 // Mark the constructors that we already have in the derived class. 7878 // 7879 // C++11 [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7880 // unless there is a user-declared constructor with the same signature in 7881 // the class where the using-declaration appears. 7882 visitAll(Derived, &InheritingConstructorInfo::noteDeclaredInDerived); 7883 } 7884 7885 void inheritAll(CXXRecordDecl *RD) { 7886 visitAll(RD, &InheritingConstructorInfo::inherit); 7887 } 7888 7889private: 7890 /// Information about an inheriting constructor. 7891 struct InheritingConstructor { 7892 InheritingConstructor() 7893 : DeclaredInDerived(false), BaseCtor(0), DerivedCtor(0) {} 7894 7895 /// If \c true, a constructor with this signature is already declared 7896 /// in the derived class. 7897 bool DeclaredInDerived; 7898 7899 /// The constructor which is inherited. 7900 const CXXConstructorDecl *BaseCtor; 7901 7902 /// The derived constructor we declared. 7903 CXXConstructorDecl *DerivedCtor; 7904 }; 7905 7906 /// Inheriting constructors with a given canonical type. There can be at 7907 /// most one such non-template constructor, and any number of templated 7908 /// constructors. 7909 struct InheritingConstructorsForType { 7910 InheritingConstructor NonTemplate; 7911 llvm::SmallVector< 7912 std::pair<TemplateParameterList*, InheritingConstructor>, 4> Templates; 7913 7914 InheritingConstructor &getEntry(Sema &S, const CXXConstructorDecl *Ctor) { 7915 if (FunctionTemplateDecl *FTD = Ctor->getDescribedFunctionTemplate()) { 7916 TemplateParameterList *ParamList = FTD->getTemplateParameters(); 7917 for (unsigned I = 0, N = Templates.size(); I != N; ++I) 7918 if (S.TemplateParameterListsAreEqual(ParamList, Templates[I].first, 7919 false, S.TPL_TemplateMatch)) 7920 return Templates[I].second; 7921 Templates.push_back(std::make_pair(ParamList, InheritingConstructor())); 7922 return Templates.back().second; 7923 } 7924 7925 return NonTemplate; 7926 } 7927 }; 7928 7929 /// Get or create the inheriting constructor record for a constructor. 7930 InheritingConstructor &getEntry(const CXXConstructorDecl *Ctor, 7931 QualType CtorType) { 7932 return Map[CtorType.getCanonicalType()->castAs<FunctionProtoType>()] 7933 .getEntry(SemaRef, Ctor); 7934 } 7935 7936 typedef void (InheritingConstructorInfo::*VisitFn)(const CXXConstructorDecl*); 7937 7938 /// Process all constructors for a class. 7939 void visitAll(const CXXRecordDecl *RD, VisitFn Callback) { 7940 for (CXXRecordDecl::ctor_iterator CtorIt = RD->ctor_begin(), 7941 CtorE = RD->ctor_end(); 7942 CtorIt != CtorE; ++CtorIt) 7943 (this->*Callback)(*CtorIt); 7944 for (CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> 7945 I(RD->decls_begin()), E(RD->decls_end()); 7946 I != E; ++I) { 7947 const FunctionDecl *FD = (*I)->getTemplatedDecl(); 7948 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) 7949 (this->*Callback)(CD); 7950 } 7951 } 7952 7953 /// Note that a constructor (or constructor template) was declared in Derived. 7954 void noteDeclaredInDerived(const CXXConstructorDecl *Ctor) { 7955 getEntry(Ctor, Ctor->getType()).DeclaredInDerived = true; 7956 } 7957 7958 /// Inherit a single constructor. 7959 void inherit(const CXXConstructorDecl *Ctor) { 7960 const FunctionProtoType *CtorType = 7961 Ctor->getType()->castAs<FunctionProtoType>(); 7962 ArrayRef<QualType> ArgTypes(CtorType->getArgTypes()); 7963 FunctionProtoType::ExtProtoInfo EPI = CtorType->getExtProtoInfo(); 7964 7965 SourceLocation UsingLoc = getUsingLoc(Ctor->getParent()); 7966 7967 // Core issue (no number yet): the ellipsis is always discarded. 7968 if (EPI.Variadic) { 7969 SemaRef.Diag(UsingLoc, diag::warn_using_decl_constructor_ellipsis); 7970 SemaRef.Diag(Ctor->getLocation(), 7971 diag::note_using_decl_constructor_ellipsis); 7972 EPI.Variadic = false; 7973 } 7974 7975 // Declare a constructor for each number of parameters. 7976 // 7977 // C++11 [class.inhctor]p1: 7978 // The candidate set of inherited constructors from the class X named in 7979 // the using-declaration consists of [... modulo defects ...] for each 7980 // constructor or constructor template of X, the set of constructors or 7981 // constructor templates that results from omitting any ellipsis parameter 7982 // specification and successively omitting parameters with a default 7983 // argument from the end of the parameter-type-list 7984 unsigned MinParams = minParamsToInherit(Ctor); 7985 unsigned Params = Ctor->getNumParams(); 7986 if (Params >= MinParams) { 7987 do 7988 declareCtor(UsingLoc, Ctor, 7989 SemaRef.Context.getFunctionType( 7990 Ctor->getResultType(), ArgTypes.slice(0, Params), EPI)); 7991 while (Params > MinParams && 7992 Ctor->getParamDecl(--Params)->hasDefaultArg()); 7993 } 7994 } 7995 7996 /// Find the using-declaration which specified that we should inherit the 7997 /// constructors of \p Base. 7998 SourceLocation getUsingLoc(const CXXRecordDecl *Base) { 7999 // No fancy lookup required; just look for the base constructor name 8000 // directly within the derived class. 8001 ASTContext &Context = SemaRef.Context; 8002 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 8003 Context.getCanonicalType(Context.getRecordType(Base))); 8004 DeclContext::lookup_const_result Decls = Derived->lookup(Name); 8005 return Decls.empty() ? Derived->getLocation() : Decls[0]->getLocation(); 8006 } 8007 8008 unsigned minParamsToInherit(const CXXConstructorDecl *Ctor) { 8009 // C++11 [class.inhctor]p3: 8010 // [F]or each constructor template in the candidate set of inherited 8011 // constructors, a constructor template is implicitly declared 8012 if (Ctor->getDescribedFunctionTemplate()) 8013 return 0; 8014 8015 // For each non-template constructor in the candidate set of inherited 8016 // constructors other than a constructor having no parameters or a 8017 // copy/move constructor having a single parameter, a constructor is 8018 // implicitly declared [...] 8019 if (Ctor->getNumParams() == 0) 8020 return 1; 8021 if (Ctor->isCopyOrMoveConstructor()) 8022 return 2; 8023 8024 // Per discussion on core reflector, never inherit a constructor which 8025 // would become a default, copy, or move constructor of Derived either. 8026 const ParmVarDecl *PD = Ctor->getParamDecl(0); 8027 const ReferenceType *RT = PD->getType()->getAs<ReferenceType>(); 8028 return (RT && RT->getPointeeCXXRecordDecl() == Derived) ? 2 : 1; 8029 } 8030 8031 /// Declare a single inheriting constructor, inheriting the specified 8032 /// constructor, with the given type. 8033 void declareCtor(SourceLocation UsingLoc, const CXXConstructorDecl *BaseCtor, 8034 QualType DerivedType) { 8035 InheritingConstructor &Entry = getEntry(BaseCtor, DerivedType); 8036 8037 // C++11 [class.inhctor]p3: 8038 // ... a constructor is implicitly declared with the same constructor 8039 // characteristics unless there is a user-declared constructor with 8040 // the same signature in the class where the using-declaration appears 8041 if (Entry.DeclaredInDerived) 8042 return; 8043 8044 // C++11 [class.inhctor]p7: 8045 // If two using-declarations declare inheriting constructors with the 8046 // same signature, the program is ill-formed 8047 if (Entry.DerivedCtor) { 8048 if (BaseCtor->getParent() != Entry.BaseCtor->getParent()) { 8049 // Only diagnose this once per constructor. 8050 if (Entry.DerivedCtor->isInvalidDecl()) 8051 return; 8052 Entry.DerivedCtor->setInvalidDecl(); 8053 8054 SemaRef.Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 8055 SemaRef.Diag(BaseCtor->getLocation(), 8056 diag::note_using_decl_constructor_conflict_current_ctor); 8057 SemaRef.Diag(Entry.BaseCtor->getLocation(), 8058 diag::note_using_decl_constructor_conflict_previous_ctor); 8059 SemaRef.Diag(Entry.DerivedCtor->getLocation(), 8060 diag::note_using_decl_constructor_conflict_previous_using); 8061 } else { 8062 // Core issue (no number): if the same inheriting constructor is 8063 // produced by multiple base class constructors from the same base 8064 // class, the inheriting constructor is defined as deleted. 8065 SemaRef.SetDeclDeleted(Entry.DerivedCtor, UsingLoc); 8066 } 8067 8068 return; 8069 } 8070 8071 ASTContext &Context = SemaRef.Context; 8072 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 8073 Context.getCanonicalType(Context.getRecordType(Derived))); 8074 DeclarationNameInfo NameInfo(Name, UsingLoc); 8075 8076 TemplateParameterList *TemplateParams = 0; 8077 if (const FunctionTemplateDecl *FTD = 8078 BaseCtor->getDescribedFunctionTemplate()) { 8079 TemplateParams = FTD->getTemplateParameters(); 8080 // We're reusing template parameters from a different DeclContext. This 8081 // is questionable at best, but works out because the template depth in 8082 // both places is guaranteed to be 0. 8083 // FIXME: Rebuild the template parameters in the new context, and 8084 // transform the function type to refer to them. 8085 } 8086 8087 // Build type source info pointing at the using-declaration. This is 8088 // required by template instantiation. 8089 TypeSourceInfo *TInfo = 8090 Context.getTrivialTypeSourceInfo(DerivedType, UsingLoc); 8091 FunctionProtoTypeLoc ProtoLoc = 8092 TInfo->getTypeLoc().IgnoreParens().castAs<FunctionProtoTypeLoc>(); 8093 8094 CXXConstructorDecl *DerivedCtor = CXXConstructorDecl::Create( 8095 Context, Derived, UsingLoc, NameInfo, DerivedType, 8096 TInfo, BaseCtor->isExplicit(), /*Inline=*/true, 8097 /*ImplicitlyDeclared=*/true, /*Constexpr=*/BaseCtor->isConstexpr()); 8098 8099 // Build an unevaluated exception specification for this constructor. 8100 const FunctionProtoType *FPT = DerivedType->castAs<FunctionProtoType>(); 8101 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 8102 EPI.ExceptionSpecType = EST_Unevaluated; 8103 EPI.ExceptionSpecDecl = DerivedCtor; 8104 DerivedCtor->setType(Context.getFunctionType(FPT->getResultType(), 8105 FPT->getArgTypes(), EPI)); 8106 8107 // Build the parameter declarations. 8108 SmallVector<ParmVarDecl *, 16> ParamDecls; 8109 for (unsigned I = 0, N = FPT->getNumArgs(); I != N; ++I) { 8110 TypeSourceInfo *TInfo = 8111 Context.getTrivialTypeSourceInfo(FPT->getArgType(I), UsingLoc); 8112 ParmVarDecl *PD = ParmVarDecl::Create( 8113 Context, DerivedCtor, UsingLoc, UsingLoc, /*IdentifierInfo=*/0, 8114 FPT->getArgType(I), TInfo, SC_None, /*DefaultArg=*/0); 8115 PD->setScopeInfo(0, I); 8116 PD->setImplicit(); 8117 ParamDecls.push_back(PD); 8118 ProtoLoc.setArg(I, PD); 8119 } 8120 8121 // Set up the new constructor. 8122 DerivedCtor->setAccess(BaseCtor->getAccess()); 8123 DerivedCtor->setParams(ParamDecls); 8124 DerivedCtor->setInheritedConstructor(BaseCtor); 8125 if (BaseCtor->isDeleted()) 8126 SemaRef.SetDeclDeleted(DerivedCtor, UsingLoc); 8127 8128 // If this is a constructor template, build the template declaration. 8129 if (TemplateParams) { 8130 FunctionTemplateDecl *DerivedTemplate = 8131 FunctionTemplateDecl::Create(SemaRef.Context, Derived, UsingLoc, Name, 8132 TemplateParams, DerivedCtor); 8133 DerivedTemplate->setAccess(BaseCtor->getAccess()); 8134 DerivedCtor->setDescribedFunctionTemplate(DerivedTemplate); 8135 Derived->addDecl(DerivedTemplate); 8136 } else { 8137 Derived->addDecl(DerivedCtor); 8138 } 8139 8140 Entry.BaseCtor = BaseCtor; 8141 Entry.DerivedCtor = DerivedCtor; 8142 } 8143 8144 Sema &SemaRef; 8145 CXXRecordDecl *Derived; 8146 typedef llvm::DenseMap<const Type *, InheritingConstructorsForType> MapType; 8147 MapType Map; 8148}; 8149} 8150 8151void Sema::DeclareInheritingConstructors(CXXRecordDecl *ClassDecl) { 8152 // Defer declaring the inheriting constructors until the class is 8153 // instantiated. 8154 if (ClassDecl->isDependentContext()) 8155 return; 8156 8157 // Find base classes from which we might inherit constructors. 8158 SmallVector<CXXRecordDecl*, 4> InheritedBases; 8159 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 8160 BaseE = ClassDecl->bases_end(); 8161 BaseIt != BaseE; ++BaseIt) 8162 if (BaseIt->getInheritConstructors()) 8163 InheritedBases.push_back(BaseIt->getType()->getAsCXXRecordDecl()); 8164 8165 // Go no further if we're not inheriting any constructors. 8166 if (InheritedBases.empty()) 8167 return; 8168 8169 // Declare the inherited constructors. 8170 InheritingConstructorInfo ICI(*this, ClassDecl); 8171 for (unsigned I = 0, N = InheritedBases.size(); I != N; ++I) 8172 ICI.inheritAll(InheritedBases[I]); 8173} 8174 8175void Sema::DefineInheritingConstructor(SourceLocation CurrentLocation, 8176 CXXConstructorDecl *Constructor) { 8177 CXXRecordDecl *ClassDecl = Constructor->getParent(); 8178 assert(Constructor->getInheritedConstructor() && 8179 !Constructor->doesThisDeclarationHaveABody() && 8180 !Constructor->isDeleted()); 8181 8182 SynthesizedFunctionScope Scope(*this, Constructor); 8183 DiagnosticErrorTrap Trap(Diags); 8184 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) || 8185 Trap.hasErrorOccurred()) { 8186 Diag(CurrentLocation, diag::note_inhctor_synthesized_at) 8187 << Context.getTagDeclType(ClassDecl); 8188 Constructor->setInvalidDecl(); 8189 return; 8190 } 8191 8192 SourceLocation Loc = Constructor->getLocation(); 8193 Constructor->setBody(new (Context) CompoundStmt(Loc)); 8194 8195 Constructor->setUsed(); 8196 MarkVTableUsed(CurrentLocation, ClassDecl); 8197 8198 if (ASTMutationListener *L = getASTMutationListener()) { 8199 L->CompletedImplicitDefinition(Constructor); 8200 } 8201} 8202 8203 8204Sema::ImplicitExceptionSpecification 8205Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 8206 CXXRecordDecl *ClassDecl = MD->getParent(); 8207 8208 // C++ [except.spec]p14: 8209 // An implicitly declared special member function (Clause 12) shall have 8210 // an exception-specification. 8211 ImplicitExceptionSpecification ExceptSpec(*this); 8212 if (ClassDecl->isInvalidDecl()) 8213 return ExceptSpec; 8214 8215 // Direct base-class destructors. 8216 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8217 BEnd = ClassDecl->bases_end(); 8218 B != BEnd; ++B) { 8219 if (B->isVirtual()) // Handled below. 8220 continue; 8221 8222 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 8223 ExceptSpec.CalledDecl(B->getLocStart(), 8224 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 8225 } 8226 8227 // Virtual base-class destructors. 8228 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8229 BEnd = ClassDecl->vbases_end(); 8230 B != BEnd; ++B) { 8231 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 8232 ExceptSpec.CalledDecl(B->getLocStart(), 8233 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 8234 } 8235 8236 // Field destructors. 8237 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8238 FEnd = ClassDecl->field_end(); 8239 F != FEnd; ++F) { 8240 if (const RecordType *RecordTy 8241 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 8242 ExceptSpec.CalledDecl(F->getLocation(), 8243 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 8244 } 8245 8246 return ExceptSpec; 8247} 8248 8249CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 8250 // C++ [class.dtor]p2: 8251 // If a class has no user-declared destructor, a destructor is 8252 // declared implicitly. An implicitly-declared destructor is an 8253 // inline public member of its class. 8254 assert(ClassDecl->needsImplicitDestructor()); 8255 8256 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDestructor); 8257 if (DSM.isAlreadyBeingDeclared()) 8258 return 0; 8259 8260 // Create the actual destructor declaration. 8261 CanQualType ClassType 8262 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 8263 SourceLocation ClassLoc = ClassDecl->getLocation(); 8264 DeclarationName Name 8265 = Context.DeclarationNames.getCXXDestructorName(ClassType); 8266 DeclarationNameInfo NameInfo(Name, ClassLoc); 8267 CXXDestructorDecl *Destructor 8268 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8269 QualType(), 0, /*isInline=*/true, 8270 /*isImplicitlyDeclared=*/true); 8271 Destructor->setAccess(AS_public); 8272 Destructor->setDefaulted(); 8273 Destructor->setImplicit(); 8274 8275 // Build an exception specification pointing back at this destructor. 8276 FunctionProtoType::ExtProtoInfo EPI; 8277 EPI.ExceptionSpecType = EST_Unevaluated; 8278 EPI.ExceptionSpecDecl = Destructor; 8279 Destructor->setType(Context.getFunctionType(Context.VoidTy, 8280 ArrayRef<QualType>(), 8281 EPI)); 8282 8283 AddOverriddenMethods(ClassDecl, Destructor); 8284 8285 // We don't need to use SpecialMemberIsTrivial here; triviality for 8286 // destructors is easy to compute. 8287 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 8288 8289 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 8290 SetDeclDeleted(Destructor, ClassLoc); 8291 8292 // Note that we have declared this destructor. 8293 ++ASTContext::NumImplicitDestructorsDeclared; 8294 8295 // Introduce this destructor into its scope. 8296 if (Scope *S = getScopeForContext(ClassDecl)) 8297 PushOnScopeChains(Destructor, S, false); 8298 ClassDecl->addDecl(Destructor); 8299 8300 return Destructor; 8301} 8302 8303void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 8304 CXXDestructorDecl *Destructor) { 8305 assert((Destructor->isDefaulted() && 8306 !Destructor->doesThisDeclarationHaveABody() && 8307 !Destructor->isDeleted()) && 8308 "DefineImplicitDestructor - call it for implicit default dtor"); 8309 CXXRecordDecl *ClassDecl = Destructor->getParent(); 8310 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 8311 8312 if (Destructor->isInvalidDecl()) 8313 return; 8314 8315 SynthesizedFunctionScope Scope(*this, Destructor); 8316 8317 DiagnosticErrorTrap Trap(Diags); 8318 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 8319 Destructor->getParent()); 8320 8321 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 8322 Diag(CurrentLocation, diag::note_member_synthesized_at) 8323 << CXXDestructor << Context.getTagDeclType(ClassDecl); 8324 8325 Destructor->setInvalidDecl(); 8326 return; 8327 } 8328 8329 SourceLocation Loc = Destructor->getLocation(); 8330 Destructor->setBody(new (Context) CompoundStmt(Loc)); 8331 Destructor->setImplicitlyDefined(true); 8332 Destructor->setUsed(); 8333 MarkVTableUsed(CurrentLocation, ClassDecl); 8334 8335 if (ASTMutationListener *L = getASTMutationListener()) { 8336 L->CompletedImplicitDefinition(Destructor); 8337 } 8338} 8339 8340/// \brief Perform any semantic analysis which needs to be delayed until all 8341/// pending class member declarations have been parsed. 8342void Sema::ActOnFinishCXXMemberDecls() { 8343 // If the context is an invalid C++ class, just suppress these checks. 8344 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(CurContext)) { 8345 if (Record->isInvalidDecl()) { 8346 DelayedDestructorExceptionSpecChecks.clear(); 8347 return; 8348 } 8349 } 8350 8351 // Perform any deferred checking of exception specifications for virtual 8352 // destructors. 8353 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 8354 i != e; ++i) { 8355 const CXXDestructorDecl *Dtor = 8356 DelayedDestructorExceptionSpecChecks[i].first; 8357 assert(!Dtor->getParent()->isDependentType() && 8358 "Should not ever add destructors of templates into the list."); 8359 CheckOverridingFunctionExceptionSpec(Dtor, 8360 DelayedDestructorExceptionSpecChecks[i].second); 8361 } 8362 DelayedDestructorExceptionSpecChecks.clear(); 8363} 8364 8365void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 8366 CXXDestructorDecl *Destructor) { 8367 assert(getLangOpts().CPlusPlus11 && 8368 "adjusting dtor exception specs was introduced in c++11"); 8369 8370 // C++11 [class.dtor]p3: 8371 // A declaration of a destructor that does not have an exception- 8372 // specification is implicitly considered to have the same exception- 8373 // specification as an implicit declaration. 8374 const FunctionProtoType *DtorType = Destructor->getType()-> 8375 getAs<FunctionProtoType>(); 8376 if (DtorType->hasExceptionSpec()) 8377 return; 8378 8379 // Replace the destructor's type, building off the existing one. Fortunately, 8380 // the only thing of interest in the destructor type is its extended info. 8381 // The return and arguments are fixed. 8382 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 8383 EPI.ExceptionSpecType = EST_Unevaluated; 8384 EPI.ExceptionSpecDecl = Destructor; 8385 Destructor->setType(Context.getFunctionType(Context.VoidTy, 8386 ArrayRef<QualType>(), 8387 EPI)); 8388 8389 // FIXME: If the destructor has a body that could throw, and the newly created 8390 // spec doesn't allow exceptions, we should emit a warning, because this 8391 // change in behavior can break conforming C++03 programs at runtime. 8392 // However, we don't have a body or an exception specification yet, so it 8393 // needs to be done somewhere else. 8394} 8395 8396/// When generating a defaulted copy or move assignment operator, if a field 8397/// should be copied with __builtin_memcpy rather than via explicit assignments, 8398/// do so. This optimization only applies for arrays of scalars, and for arrays 8399/// of class type where the selected copy/move-assignment operator is trivial. 8400static StmtResult 8401buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T, 8402 Expr *To, Expr *From) { 8403 // Compute the size of the memory buffer to be copied. 8404 QualType SizeType = S.Context.getSizeType(); 8405 llvm::APInt Size(S.Context.getTypeSize(SizeType), 8406 S.Context.getTypeSizeInChars(T).getQuantity()); 8407 8408 // Take the address of the field references for "from" and "to". We 8409 // directly construct UnaryOperators here because semantic analysis 8410 // does not permit us to take the address of an xvalue. 8411 From = new (S.Context) UnaryOperator(From, UO_AddrOf, 8412 S.Context.getPointerType(From->getType()), 8413 VK_RValue, OK_Ordinary, Loc); 8414 To = new (S.Context) UnaryOperator(To, UO_AddrOf, 8415 S.Context.getPointerType(To->getType()), 8416 VK_RValue, OK_Ordinary, Loc); 8417 8418 const Type *E = T->getBaseElementTypeUnsafe(); 8419 bool NeedsCollectableMemCpy = 8420 E->isRecordType() && E->getAs<RecordType>()->getDecl()->hasObjectMember(); 8421 8422 // Create a reference to the __builtin_objc_memmove_collectable function 8423 StringRef MemCpyName = NeedsCollectableMemCpy ? 8424 "__builtin_objc_memmove_collectable" : 8425 "__builtin_memcpy"; 8426 LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc, 8427 Sema::LookupOrdinaryName); 8428 S.LookupName(R, S.TUScope, true); 8429 8430 FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>(); 8431 if (!MemCpy) 8432 // Something went horribly wrong earlier, and we will have complained 8433 // about it. 8434 return StmtError(); 8435 8436 ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy, 8437 VK_RValue, Loc, 0); 8438 assert(MemCpyRef.isUsable() && "Builtin reference cannot fail"); 8439 8440 Expr *CallArgs[] = { 8441 To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc) 8442 }; 8443 ExprResult Call = S.ActOnCallExpr(/*Scope=*/0, MemCpyRef.take(), 8444 Loc, CallArgs, Loc); 8445 8446 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8447 return S.Owned(Call.takeAs<Stmt>()); 8448} 8449 8450/// \brief Builds a statement that copies/moves the given entity from \p From to 8451/// \c To. 8452/// 8453/// This routine is used to copy/move the members of a class with an 8454/// implicitly-declared copy/move assignment operator. When the entities being 8455/// copied are arrays, this routine builds for loops to copy them. 8456/// 8457/// \param S The Sema object used for type-checking. 8458/// 8459/// \param Loc The location where the implicit copy/move is being generated. 8460/// 8461/// \param T The type of the expressions being copied/moved. Both expressions 8462/// must have this type. 8463/// 8464/// \param To The expression we are copying/moving to. 8465/// 8466/// \param From The expression we are copying/moving from. 8467/// 8468/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 8469/// Otherwise, it's a non-static member subobject. 8470/// 8471/// \param Copying Whether we're copying or moving. 8472/// 8473/// \param Depth Internal parameter recording the depth of the recursion. 8474/// 8475/// \returns A statement or a loop that copies the expressions, or StmtResult(0) 8476/// if a memcpy should be used instead. 8477static StmtResult 8478buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T, 8479 Expr *To, Expr *From, 8480 bool CopyingBaseSubobject, bool Copying, 8481 unsigned Depth = 0) { 8482 // C++11 [class.copy]p28: 8483 // Each subobject is assigned in the manner appropriate to its type: 8484 // 8485 // - if the subobject is of class type, as if by a call to operator= with 8486 // the subobject as the object expression and the corresponding 8487 // subobject of x as a single function argument (as if by explicit 8488 // qualification; that is, ignoring any possible virtual overriding 8489 // functions in more derived classes); 8490 // 8491 // C++03 [class.copy]p13: 8492 // - if the subobject is of class type, the copy assignment operator for 8493 // the class is used (as if by explicit qualification; that is, 8494 // ignoring any possible virtual overriding functions in more derived 8495 // classes); 8496 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 8497 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8498 8499 // Look for operator=. 8500 DeclarationName Name 8501 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8502 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 8503 S.LookupQualifiedName(OpLookup, ClassDecl, false); 8504 8505 // Prior to C++11, filter out any result that isn't a copy/move-assignment 8506 // operator. 8507 if (!S.getLangOpts().CPlusPlus11) { 8508 LookupResult::Filter F = OpLookup.makeFilter(); 8509 while (F.hasNext()) { 8510 NamedDecl *D = F.next(); 8511 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 8512 if (Method->isCopyAssignmentOperator() || 8513 (!Copying && Method->isMoveAssignmentOperator())) 8514 continue; 8515 8516 F.erase(); 8517 } 8518 F.done(); 8519 } 8520 8521 // Suppress the protected check (C++ [class.protected]) for each of the 8522 // assignment operators we found. This strange dance is required when 8523 // we're assigning via a base classes's copy-assignment operator. To 8524 // ensure that we're getting the right base class subobject (without 8525 // ambiguities), we need to cast "this" to that subobject type; to 8526 // ensure that we don't go through the virtual call mechanism, we need 8527 // to qualify the operator= name with the base class (see below). However, 8528 // this means that if the base class has a protected copy assignment 8529 // operator, the protected member access check will fail. So, we 8530 // rewrite "protected" access to "public" access in this case, since we 8531 // know by construction that we're calling from a derived class. 8532 if (CopyingBaseSubobject) { 8533 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 8534 L != LEnd; ++L) { 8535 if (L.getAccess() == AS_protected) 8536 L.setAccess(AS_public); 8537 } 8538 } 8539 8540 // Create the nested-name-specifier that will be used to qualify the 8541 // reference to operator=; this is required to suppress the virtual 8542 // call mechanism. 8543 CXXScopeSpec SS; 8544 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 8545 SS.MakeTrivial(S.Context, 8546 NestedNameSpecifier::Create(S.Context, 0, false, 8547 CanonicalT), 8548 Loc); 8549 8550 // Create the reference to operator=. 8551 ExprResult OpEqualRef 8552 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 8553 /*TemplateKWLoc=*/SourceLocation(), 8554 /*FirstQualifierInScope=*/0, 8555 OpLookup, 8556 /*TemplateArgs=*/0, 8557 /*SuppressQualifierCheck=*/true); 8558 if (OpEqualRef.isInvalid()) 8559 return StmtError(); 8560 8561 // Build the call to the assignment operator. 8562 8563 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 8564 OpEqualRef.takeAs<Expr>(), 8565 Loc, &From, 1, Loc); 8566 if (Call.isInvalid()) 8567 return StmtError(); 8568 8569 // If we built a call to a trivial 'operator=' while copying an array, 8570 // bail out. We'll replace the whole shebang with a memcpy. 8571 CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get()); 8572 if (CE && CE->getMethodDecl()->isTrivial() && Depth) 8573 return StmtResult((Stmt*)0); 8574 8575 // Convert to an expression-statement, and clean up any produced 8576 // temporaries. 8577 return S.ActOnExprStmt(Call); 8578 } 8579 8580 // - if the subobject is of scalar type, the built-in assignment 8581 // operator is used. 8582 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 8583 if (!ArrayTy) { 8584 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 8585 if (Assignment.isInvalid()) 8586 return StmtError(); 8587 return S.ActOnExprStmt(Assignment); 8588 } 8589 8590 // - if the subobject is an array, each element is assigned, in the 8591 // manner appropriate to the element type; 8592 8593 // Construct a loop over the array bounds, e.g., 8594 // 8595 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 8596 // 8597 // that will copy each of the array elements. 8598 QualType SizeType = S.Context.getSizeType(); 8599 8600 // Create the iteration variable. 8601 IdentifierInfo *IterationVarName = 0; 8602 { 8603 SmallString<8> Str; 8604 llvm::raw_svector_ostream OS(Str); 8605 OS << "__i" << Depth; 8606 IterationVarName = &S.Context.Idents.get(OS.str()); 8607 } 8608 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 8609 IterationVarName, SizeType, 8610 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 8611 SC_None); 8612 8613 // Initialize the iteration variable to zero. 8614 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 8615 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 8616 8617 // Create a reference to the iteration variable; we'll use this several 8618 // times throughout. 8619 Expr *IterationVarRef 8620 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 8621 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 8622 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 8623 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 8624 8625 // Create the DeclStmt that holds the iteration variable. 8626 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 8627 8628 // Subscript the "from" and "to" expressions with the iteration variable. 8629 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 8630 IterationVarRefRVal, 8631 Loc)); 8632 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 8633 IterationVarRefRVal, 8634 Loc)); 8635 if (!Copying) // Cast to rvalue 8636 From = CastForMoving(S, From); 8637 8638 // Build the copy/move for an individual element of the array. 8639 StmtResult Copy = 8640 buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(), 8641 To, From, CopyingBaseSubobject, 8642 Copying, Depth + 1); 8643 // Bail out if copying fails or if we determined that we should use memcpy. 8644 if (Copy.isInvalid() || !Copy.get()) 8645 return Copy; 8646 8647 // Create the comparison against the array bound. 8648 llvm::APInt Upper 8649 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 8650 Expr *Comparison 8651 = new (S.Context) BinaryOperator(IterationVarRefRVal, 8652 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 8653 BO_NE, S.Context.BoolTy, 8654 VK_RValue, OK_Ordinary, Loc, false); 8655 8656 // Create the pre-increment of the iteration variable. 8657 Expr *Increment 8658 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 8659 VK_LValue, OK_Ordinary, Loc); 8660 8661 // Construct the loop that copies all elements of this array. 8662 return S.ActOnForStmt(Loc, Loc, InitStmt, 8663 S.MakeFullExpr(Comparison), 8664 0, S.MakeFullDiscardedValueExpr(Increment), 8665 Loc, Copy.take()); 8666} 8667 8668static StmtResult 8669buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 8670 Expr *To, Expr *From, 8671 bool CopyingBaseSubobject, bool Copying) { 8672 // Maybe we should use a memcpy? 8673 if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() && 8674 T.isTriviallyCopyableType(S.Context)) 8675 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 8676 8677 StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From, 8678 CopyingBaseSubobject, 8679 Copying, 0)); 8680 8681 // If we ended up picking a trivial assignment operator for an array of a 8682 // non-trivially-copyable class type, just emit a memcpy. 8683 if (!Result.isInvalid() && !Result.get()) 8684 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 8685 8686 return Result; 8687} 8688 8689Sema::ImplicitExceptionSpecification 8690Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 8691 CXXRecordDecl *ClassDecl = MD->getParent(); 8692 8693 ImplicitExceptionSpecification ExceptSpec(*this); 8694 if (ClassDecl->isInvalidDecl()) 8695 return ExceptSpec; 8696 8697 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 8698 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 8699 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 8700 8701 // C++ [except.spec]p14: 8702 // An implicitly declared special member function (Clause 12) shall have an 8703 // exception-specification. [...] 8704 8705 // It is unspecified whether or not an implicit copy assignment operator 8706 // attempts to deduplicate calls to assignment operators of virtual bases are 8707 // made. As such, this exception specification is effectively unspecified. 8708 // Based on a similar decision made for constness in C++0x, we're erring on 8709 // the side of assuming such calls to be made regardless of whether they 8710 // actually happen. 8711 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8712 BaseEnd = ClassDecl->bases_end(); 8713 Base != BaseEnd; ++Base) { 8714 if (Base->isVirtual()) 8715 continue; 8716 8717 CXXRecordDecl *BaseClassDecl 8718 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8719 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 8720 ArgQuals, false, 0)) 8721 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 8722 } 8723 8724 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8725 BaseEnd = ClassDecl->vbases_end(); 8726 Base != BaseEnd; ++Base) { 8727 CXXRecordDecl *BaseClassDecl 8728 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8729 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 8730 ArgQuals, false, 0)) 8731 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 8732 } 8733 8734 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8735 FieldEnd = ClassDecl->field_end(); 8736 Field != FieldEnd; 8737 ++Field) { 8738 QualType FieldType = Context.getBaseElementType(Field->getType()); 8739 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8740 if (CXXMethodDecl *CopyAssign = 8741 LookupCopyingAssignment(FieldClassDecl, 8742 ArgQuals | FieldType.getCVRQualifiers(), 8743 false, 0)) 8744 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 8745 } 8746 } 8747 8748 return ExceptSpec; 8749} 8750 8751CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 8752 // Note: The following rules are largely analoguous to the copy 8753 // constructor rules. Note that virtual bases are not taken into account 8754 // for determining the argument type of the operator. Note also that 8755 // operators taking an object instead of a reference are allowed. 8756 assert(ClassDecl->needsImplicitCopyAssignment()); 8757 8758 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyAssignment); 8759 if (DSM.isAlreadyBeingDeclared()) 8760 return 0; 8761 8762 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8763 QualType RetType = Context.getLValueReferenceType(ArgType); 8764 if (ClassDecl->implicitCopyAssignmentHasConstParam()) 8765 ArgType = ArgType.withConst(); 8766 ArgType = Context.getLValueReferenceType(ArgType); 8767 8768 // An implicitly-declared copy assignment operator is an inline public 8769 // member of its class. 8770 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8771 SourceLocation ClassLoc = ClassDecl->getLocation(); 8772 DeclarationNameInfo NameInfo(Name, ClassLoc); 8773 CXXMethodDecl *CopyAssignment 8774 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8775 /*TInfo=*/0, 8776 /*StorageClass=*/SC_None, 8777 /*isInline=*/true, /*isConstexpr=*/false, 8778 SourceLocation()); 8779 CopyAssignment->setAccess(AS_public); 8780 CopyAssignment->setDefaulted(); 8781 CopyAssignment->setImplicit(); 8782 8783 // Build an exception specification pointing back at this member. 8784 FunctionProtoType::ExtProtoInfo EPI; 8785 EPI.ExceptionSpecType = EST_Unevaluated; 8786 EPI.ExceptionSpecDecl = CopyAssignment; 8787 CopyAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); 8788 8789 // Add the parameter to the operator. 8790 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 8791 ClassLoc, ClassLoc, /*Id=*/0, 8792 ArgType, /*TInfo=*/0, 8793 SC_None, 0); 8794 CopyAssignment->setParams(FromParam); 8795 8796 AddOverriddenMethods(ClassDecl, CopyAssignment); 8797 8798 CopyAssignment->setTrivial( 8799 ClassDecl->needsOverloadResolutionForCopyAssignment() 8800 ? SpecialMemberIsTrivial(CopyAssignment, CXXCopyAssignment) 8801 : ClassDecl->hasTrivialCopyAssignment()); 8802 8803 // C++0x [class.copy]p19: 8804 // .... If the class definition does not explicitly declare a copy 8805 // assignment operator, there is no user-declared move constructor, and 8806 // there is no user-declared move assignment operator, a copy assignment 8807 // operator is implicitly declared as defaulted. 8808 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 8809 SetDeclDeleted(CopyAssignment, ClassLoc); 8810 8811 // Note that we have added this copy-assignment operator. 8812 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 8813 8814 if (Scope *S = getScopeForContext(ClassDecl)) 8815 PushOnScopeChains(CopyAssignment, S, false); 8816 ClassDecl->addDecl(CopyAssignment); 8817 8818 return CopyAssignment; 8819} 8820 8821void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 8822 CXXMethodDecl *CopyAssignOperator) { 8823 assert((CopyAssignOperator->isDefaulted() && 8824 CopyAssignOperator->isOverloadedOperator() && 8825 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 8826 !CopyAssignOperator->doesThisDeclarationHaveABody() && 8827 !CopyAssignOperator->isDeleted()) && 8828 "DefineImplicitCopyAssignment called for wrong function"); 8829 8830 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 8831 8832 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 8833 CopyAssignOperator->setInvalidDecl(); 8834 return; 8835 } 8836 8837 CopyAssignOperator->setUsed(); 8838 8839 SynthesizedFunctionScope Scope(*this, CopyAssignOperator); 8840 DiagnosticErrorTrap Trap(Diags); 8841 8842 // C++0x [class.copy]p30: 8843 // The implicitly-defined or explicitly-defaulted copy assignment operator 8844 // for a non-union class X performs memberwise copy assignment of its 8845 // subobjects. The direct base classes of X are assigned first, in the 8846 // order of their declaration in the base-specifier-list, and then the 8847 // immediate non-static data members of X are assigned, in the order in 8848 // which they were declared in the class definition. 8849 8850 // The statements that form the synthesized function body. 8851 SmallVector<Stmt*, 8> Statements; 8852 8853 // The parameter for the "other" object, which we are copying from. 8854 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 8855 Qualifiers OtherQuals = Other->getType().getQualifiers(); 8856 QualType OtherRefType = Other->getType(); 8857 if (const LValueReferenceType *OtherRef 8858 = OtherRefType->getAs<LValueReferenceType>()) { 8859 OtherRefType = OtherRef->getPointeeType(); 8860 OtherQuals = OtherRefType.getQualifiers(); 8861 } 8862 8863 // Our location for everything implicitly-generated. 8864 SourceLocation Loc = CopyAssignOperator->getLocation(); 8865 8866 // Construct a reference to the "other" object. We'll be using this 8867 // throughout the generated ASTs. 8868 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8869 assert(OtherRef && "Reference to parameter cannot fail!"); 8870 8871 // Construct the "this" pointer. We'll be using this throughout the generated 8872 // ASTs. 8873 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8874 assert(This && "Reference to this cannot fail!"); 8875 8876 // Assign base classes. 8877 bool Invalid = false; 8878 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8879 E = ClassDecl->bases_end(); Base != E; ++Base) { 8880 // Form the assignment: 8881 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 8882 QualType BaseType = Base->getType().getUnqualifiedType(); 8883 if (!BaseType->isRecordType()) { 8884 Invalid = true; 8885 continue; 8886 } 8887 8888 CXXCastPath BasePath; 8889 BasePath.push_back(Base); 8890 8891 // Construct the "from" expression, which is an implicit cast to the 8892 // appropriately-qualified base type. 8893 Expr *From = OtherRef; 8894 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 8895 CK_UncheckedDerivedToBase, 8896 VK_LValue, &BasePath).take(); 8897 8898 // Dereference "this". 8899 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8900 8901 // Implicitly cast "this" to the appropriately-qualified base type. 8902 To = ImpCastExprToType(To.take(), 8903 Context.getCVRQualifiedType(BaseType, 8904 CopyAssignOperator->getTypeQualifiers()), 8905 CK_UncheckedDerivedToBase, 8906 VK_LValue, &BasePath); 8907 8908 // Build the copy. 8909 StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType, 8910 To.get(), From, 8911 /*CopyingBaseSubobject=*/true, 8912 /*Copying=*/true); 8913 if (Copy.isInvalid()) { 8914 Diag(CurrentLocation, diag::note_member_synthesized_at) 8915 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8916 CopyAssignOperator->setInvalidDecl(); 8917 return; 8918 } 8919 8920 // Success! Record the copy. 8921 Statements.push_back(Copy.takeAs<Expr>()); 8922 } 8923 8924 // Assign non-static members. 8925 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8926 FieldEnd = ClassDecl->field_end(); 8927 Field != FieldEnd; ++Field) { 8928 if (Field->isUnnamedBitfield()) 8929 continue; 8930 8931 // Check for members of reference type; we can't copy those. 8932 if (Field->getType()->isReferenceType()) { 8933 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8934 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8935 Diag(Field->getLocation(), diag::note_declared_at); 8936 Diag(CurrentLocation, diag::note_member_synthesized_at) 8937 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8938 Invalid = true; 8939 continue; 8940 } 8941 8942 // Check for members of const-qualified, non-class type. 8943 QualType BaseType = Context.getBaseElementType(Field->getType()); 8944 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8945 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8946 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8947 Diag(Field->getLocation(), diag::note_declared_at); 8948 Diag(CurrentLocation, diag::note_member_synthesized_at) 8949 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8950 Invalid = true; 8951 continue; 8952 } 8953 8954 // Suppress assigning zero-width bitfields. 8955 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8956 continue; 8957 8958 QualType FieldType = Field->getType().getNonReferenceType(); 8959 if (FieldType->isIncompleteArrayType()) { 8960 assert(ClassDecl->hasFlexibleArrayMember() && 8961 "Incomplete array type is not valid"); 8962 continue; 8963 } 8964 8965 // Build references to the field in the object we're copying from and to. 8966 CXXScopeSpec SS; // Intentionally empty 8967 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8968 LookupMemberName); 8969 MemberLookup.addDecl(*Field); 8970 MemberLookup.resolveKind(); 8971 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8972 Loc, /*IsArrow=*/false, 8973 SS, SourceLocation(), 0, 8974 MemberLookup, 0); 8975 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8976 Loc, /*IsArrow=*/true, 8977 SS, SourceLocation(), 0, 8978 MemberLookup, 0); 8979 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8980 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8981 8982 // Build the copy of this field. 8983 StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType, 8984 To.get(), From.get(), 8985 /*CopyingBaseSubobject=*/false, 8986 /*Copying=*/true); 8987 if (Copy.isInvalid()) { 8988 Diag(CurrentLocation, diag::note_member_synthesized_at) 8989 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8990 CopyAssignOperator->setInvalidDecl(); 8991 return; 8992 } 8993 8994 // Success! Record the copy. 8995 Statements.push_back(Copy.takeAs<Stmt>()); 8996 } 8997 8998 if (!Invalid) { 8999 // Add a "return *this;" 9000 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 9001 9002 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 9003 if (Return.isInvalid()) 9004 Invalid = true; 9005 else { 9006 Statements.push_back(Return.takeAs<Stmt>()); 9007 9008 if (Trap.hasErrorOccurred()) { 9009 Diag(CurrentLocation, diag::note_member_synthesized_at) 9010 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9011 Invalid = true; 9012 } 9013 } 9014 } 9015 9016 if (Invalid) { 9017 CopyAssignOperator->setInvalidDecl(); 9018 return; 9019 } 9020 9021 StmtResult Body; 9022 { 9023 CompoundScopeRAII CompoundScope(*this); 9024 Body = ActOnCompoundStmt(Loc, Loc, Statements, 9025 /*isStmtExpr=*/false); 9026 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 9027 } 9028 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 9029 9030 if (ASTMutationListener *L = getASTMutationListener()) { 9031 L->CompletedImplicitDefinition(CopyAssignOperator); 9032 } 9033} 9034 9035Sema::ImplicitExceptionSpecification 9036Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 9037 CXXRecordDecl *ClassDecl = MD->getParent(); 9038 9039 ImplicitExceptionSpecification ExceptSpec(*this); 9040 if (ClassDecl->isInvalidDecl()) 9041 return ExceptSpec; 9042 9043 // C++0x [except.spec]p14: 9044 // An implicitly declared special member function (Clause 12) shall have an 9045 // exception-specification. [...] 9046 9047 // It is unspecified whether or not an implicit move assignment operator 9048 // attempts to deduplicate calls to assignment operators of virtual bases are 9049 // made. As such, this exception specification is effectively unspecified. 9050 // Based on a similar decision made for constness in C++0x, we're erring on 9051 // the side of assuming such calls to be made regardless of whether they 9052 // actually happen. 9053 // Note that a move constructor is not implicitly declared when there are 9054 // virtual bases, but it can still be user-declared and explicitly defaulted. 9055 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9056 BaseEnd = ClassDecl->bases_end(); 9057 Base != BaseEnd; ++Base) { 9058 if (Base->isVirtual()) 9059 continue; 9060 9061 CXXRecordDecl *BaseClassDecl 9062 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9063 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 9064 0, false, 0)) 9065 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 9066 } 9067 9068 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9069 BaseEnd = ClassDecl->vbases_end(); 9070 Base != BaseEnd; ++Base) { 9071 CXXRecordDecl *BaseClassDecl 9072 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9073 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 9074 0, false, 0)) 9075 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 9076 } 9077 9078 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9079 FieldEnd = ClassDecl->field_end(); 9080 Field != FieldEnd; 9081 ++Field) { 9082 QualType FieldType = Context.getBaseElementType(Field->getType()); 9083 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 9084 if (CXXMethodDecl *MoveAssign = 9085 LookupMovingAssignment(FieldClassDecl, 9086 FieldType.getCVRQualifiers(), 9087 false, 0)) 9088 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 9089 } 9090 } 9091 9092 return ExceptSpec; 9093} 9094 9095/// Determine whether the class type has any direct or indirect virtual base 9096/// classes which have a non-trivial move assignment operator. 9097static bool 9098hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 9099 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9100 BaseEnd = ClassDecl->vbases_end(); 9101 Base != BaseEnd; ++Base) { 9102 CXXRecordDecl *BaseClass = 9103 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9104 9105 // Try to declare the move assignment. If it would be deleted, then the 9106 // class does not have a non-trivial move assignment. 9107 if (BaseClass->needsImplicitMoveAssignment()) 9108 S.DeclareImplicitMoveAssignment(BaseClass); 9109 9110 if (BaseClass->hasNonTrivialMoveAssignment()) 9111 return true; 9112 } 9113 9114 return false; 9115} 9116 9117/// Determine whether the given type either has a move constructor or is 9118/// trivially copyable. 9119static bool 9120hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 9121 Type = S.Context.getBaseElementType(Type); 9122 9123 // FIXME: Technically, non-trivially-copyable non-class types, such as 9124 // reference types, are supposed to return false here, but that appears 9125 // to be a standard defect. 9126 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 9127 if (!ClassDecl || !ClassDecl->getDefinition() || ClassDecl->isInvalidDecl()) 9128 return true; 9129 9130 if (Type.isTriviallyCopyableType(S.Context)) 9131 return true; 9132 9133 if (IsConstructor) { 9134 // FIXME: Need this because otherwise hasMoveConstructor isn't guaranteed to 9135 // give the right answer. 9136 if (ClassDecl->needsImplicitMoveConstructor()) 9137 S.DeclareImplicitMoveConstructor(ClassDecl); 9138 return ClassDecl->hasMoveConstructor(); 9139 } 9140 9141 // FIXME: Need this because otherwise hasMoveAssignment isn't guaranteed to 9142 // give the right answer. 9143 if (ClassDecl->needsImplicitMoveAssignment()) 9144 S.DeclareImplicitMoveAssignment(ClassDecl); 9145 return ClassDecl->hasMoveAssignment(); 9146} 9147 9148/// Determine whether all non-static data members and direct or virtual bases 9149/// of class \p ClassDecl have either a move operation, or are trivially 9150/// copyable. 9151static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 9152 bool IsConstructor) { 9153 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9154 BaseEnd = ClassDecl->bases_end(); 9155 Base != BaseEnd; ++Base) { 9156 if (Base->isVirtual()) 9157 continue; 9158 9159 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 9160 return false; 9161 } 9162 9163 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9164 BaseEnd = ClassDecl->vbases_end(); 9165 Base != BaseEnd; ++Base) { 9166 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 9167 return false; 9168 } 9169 9170 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9171 FieldEnd = ClassDecl->field_end(); 9172 Field != FieldEnd; ++Field) { 9173 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 9174 return false; 9175 } 9176 9177 return true; 9178} 9179 9180CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 9181 // C++11 [class.copy]p20: 9182 // If the definition of a class X does not explicitly declare a move 9183 // assignment operator, one will be implicitly declared as defaulted 9184 // if and only if: 9185 // 9186 // - [first 4 bullets] 9187 assert(ClassDecl->needsImplicitMoveAssignment()); 9188 9189 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveAssignment); 9190 if (DSM.isAlreadyBeingDeclared()) 9191 return 0; 9192 9193 // [Checked after we build the declaration] 9194 // - the move assignment operator would not be implicitly defined as 9195 // deleted, 9196 9197 // [DR1402]: 9198 // - X has no direct or indirect virtual base class with a non-trivial 9199 // move assignment operator, and 9200 // - each of X's non-static data members and direct or virtual base classes 9201 // has a type that either has a move assignment operator or is trivially 9202 // copyable. 9203 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 9204 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 9205 ClassDecl->setFailedImplicitMoveAssignment(); 9206 return 0; 9207 } 9208 9209 // Note: The following rules are largely analoguous to the move 9210 // constructor rules. 9211 9212 QualType ArgType = Context.getTypeDeclType(ClassDecl); 9213 QualType RetType = Context.getLValueReferenceType(ArgType); 9214 ArgType = Context.getRValueReferenceType(ArgType); 9215 9216 // An implicitly-declared move assignment operator is an inline public 9217 // member of its class. 9218 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 9219 SourceLocation ClassLoc = ClassDecl->getLocation(); 9220 DeclarationNameInfo NameInfo(Name, ClassLoc); 9221 CXXMethodDecl *MoveAssignment 9222 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 9223 /*TInfo=*/0, 9224 /*StorageClass=*/SC_None, 9225 /*isInline=*/true, 9226 /*isConstexpr=*/false, 9227 SourceLocation()); 9228 MoveAssignment->setAccess(AS_public); 9229 MoveAssignment->setDefaulted(); 9230 MoveAssignment->setImplicit(); 9231 9232 // Build an exception specification pointing back at this member. 9233 FunctionProtoType::ExtProtoInfo EPI; 9234 EPI.ExceptionSpecType = EST_Unevaluated; 9235 EPI.ExceptionSpecDecl = MoveAssignment; 9236 MoveAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); 9237 9238 // Add the parameter to the operator. 9239 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 9240 ClassLoc, ClassLoc, /*Id=*/0, 9241 ArgType, /*TInfo=*/0, 9242 SC_None, 0); 9243 MoveAssignment->setParams(FromParam); 9244 9245 AddOverriddenMethods(ClassDecl, MoveAssignment); 9246 9247 MoveAssignment->setTrivial( 9248 ClassDecl->needsOverloadResolutionForMoveAssignment() 9249 ? SpecialMemberIsTrivial(MoveAssignment, CXXMoveAssignment) 9250 : ClassDecl->hasTrivialMoveAssignment()); 9251 9252 // C++0x [class.copy]p9: 9253 // If the definition of a class X does not explicitly declare a move 9254 // assignment operator, one will be implicitly declared as defaulted if and 9255 // only if: 9256 // [...] 9257 // - the move assignment operator would not be implicitly defined as 9258 // deleted. 9259 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 9260 // Cache this result so that we don't try to generate this over and over 9261 // on every lookup, leaking memory and wasting time. 9262 ClassDecl->setFailedImplicitMoveAssignment(); 9263 return 0; 9264 } 9265 9266 // Note that we have added this copy-assignment operator. 9267 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 9268 9269 if (Scope *S = getScopeForContext(ClassDecl)) 9270 PushOnScopeChains(MoveAssignment, S, false); 9271 ClassDecl->addDecl(MoveAssignment); 9272 9273 return MoveAssignment; 9274} 9275 9276void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 9277 CXXMethodDecl *MoveAssignOperator) { 9278 assert((MoveAssignOperator->isDefaulted() && 9279 MoveAssignOperator->isOverloadedOperator() && 9280 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 9281 !MoveAssignOperator->doesThisDeclarationHaveABody() && 9282 !MoveAssignOperator->isDeleted()) && 9283 "DefineImplicitMoveAssignment called for wrong function"); 9284 9285 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 9286 9287 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 9288 MoveAssignOperator->setInvalidDecl(); 9289 return; 9290 } 9291 9292 MoveAssignOperator->setUsed(); 9293 9294 SynthesizedFunctionScope Scope(*this, MoveAssignOperator); 9295 DiagnosticErrorTrap Trap(Diags); 9296 9297 // C++0x [class.copy]p28: 9298 // The implicitly-defined or move assignment operator for a non-union class 9299 // X performs memberwise move assignment of its subobjects. The direct base 9300 // classes of X are assigned first, in the order of their declaration in the 9301 // base-specifier-list, and then the immediate non-static data members of X 9302 // are assigned, in the order in which they were declared in the class 9303 // definition. 9304 9305 // The statements that form the synthesized function body. 9306 SmallVector<Stmt*, 8> Statements; 9307 9308 // The parameter for the "other" object, which we are move from. 9309 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 9310 QualType OtherRefType = Other->getType()-> 9311 getAs<RValueReferenceType>()->getPointeeType(); 9312 assert(OtherRefType.getQualifiers() == 0 && 9313 "Bad argument type of defaulted move assignment"); 9314 9315 // Our location for everything implicitly-generated. 9316 SourceLocation Loc = MoveAssignOperator->getLocation(); 9317 9318 // Construct a reference to the "other" object. We'll be using this 9319 // throughout the generated ASTs. 9320 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 9321 assert(OtherRef && "Reference to parameter cannot fail!"); 9322 // Cast to rvalue. 9323 OtherRef = CastForMoving(*this, OtherRef); 9324 9325 // Construct the "this" pointer. We'll be using this throughout the generated 9326 // ASTs. 9327 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 9328 assert(This && "Reference to this cannot fail!"); 9329 9330 // Assign base classes. 9331 bool Invalid = false; 9332 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9333 E = ClassDecl->bases_end(); Base != E; ++Base) { 9334 // Form the assignment: 9335 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 9336 QualType BaseType = Base->getType().getUnqualifiedType(); 9337 if (!BaseType->isRecordType()) { 9338 Invalid = true; 9339 continue; 9340 } 9341 9342 CXXCastPath BasePath; 9343 BasePath.push_back(Base); 9344 9345 // Construct the "from" expression, which is an implicit cast to the 9346 // appropriately-qualified base type. 9347 Expr *From = OtherRef; 9348 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 9349 VK_XValue, &BasePath).take(); 9350 9351 // Dereference "this". 9352 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 9353 9354 // Implicitly cast "this" to the appropriately-qualified base type. 9355 To = ImpCastExprToType(To.take(), 9356 Context.getCVRQualifiedType(BaseType, 9357 MoveAssignOperator->getTypeQualifiers()), 9358 CK_UncheckedDerivedToBase, 9359 VK_LValue, &BasePath); 9360 9361 // Build the move. 9362 StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType, 9363 To.get(), From, 9364 /*CopyingBaseSubobject=*/true, 9365 /*Copying=*/false); 9366 if (Move.isInvalid()) { 9367 Diag(CurrentLocation, diag::note_member_synthesized_at) 9368 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9369 MoveAssignOperator->setInvalidDecl(); 9370 return; 9371 } 9372 9373 // Success! Record the move. 9374 Statements.push_back(Move.takeAs<Expr>()); 9375 } 9376 9377 // Assign non-static members. 9378 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9379 FieldEnd = ClassDecl->field_end(); 9380 Field != FieldEnd; ++Field) { 9381 if (Field->isUnnamedBitfield()) 9382 continue; 9383 9384 // Check for members of reference type; we can't move those. 9385 if (Field->getType()->isReferenceType()) { 9386 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9387 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 9388 Diag(Field->getLocation(), diag::note_declared_at); 9389 Diag(CurrentLocation, diag::note_member_synthesized_at) 9390 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9391 Invalid = true; 9392 continue; 9393 } 9394 9395 // Check for members of const-qualified, non-class type. 9396 QualType BaseType = Context.getBaseElementType(Field->getType()); 9397 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 9398 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9399 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 9400 Diag(Field->getLocation(), diag::note_declared_at); 9401 Diag(CurrentLocation, diag::note_member_synthesized_at) 9402 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9403 Invalid = true; 9404 continue; 9405 } 9406 9407 // Suppress assigning zero-width bitfields. 9408 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 9409 continue; 9410 9411 QualType FieldType = Field->getType().getNonReferenceType(); 9412 if (FieldType->isIncompleteArrayType()) { 9413 assert(ClassDecl->hasFlexibleArrayMember() && 9414 "Incomplete array type is not valid"); 9415 continue; 9416 } 9417 9418 // Build references to the field in the object we're copying from and to. 9419 CXXScopeSpec SS; // Intentionally empty 9420 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 9421 LookupMemberName); 9422 MemberLookup.addDecl(*Field); 9423 MemberLookup.resolveKind(); 9424 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 9425 Loc, /*IsArrow=*/false, 9426 SS, SourceLocation(), 0, 9427 MemberLookup, 0); 9428 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 9429 Loc, /*IsArrow=*/true, 9430 SS, SourceLocation(), 0, 9431 MemberLookup, 0); 9432 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 9433 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 9434 9435 assert(!From.get()->isLValue() && // could be xvalue or prvalue 9436 "Member reference with rvalue base must be rvalue except for reference " 9437 "members, which aren't allowed for move assignment."); 9438 9439 // Build the move of this field. 9440 StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType, 9441 To.get(), From.get(), 9442 /*CopyingBaseSubobject=*/false, 9443 /*Copying=*/false); 9444 if (Move.isInvalid()) { 9445 Diag(CurrentLocation, diag::note_member_synthesized_at) 9446 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9447 MoveAssignOperator->setInvalidDecl(); 9448 return; 9449 } 9450 9451 // Success! Record the copy. 9452 Statements.push_back(Move.takeAs<Stmt>()); 9453 } 9454 9455 if (!Invalid) { 9456 // Add a "return *this;" 9457 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 9458 9459 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 9460 if (Return.isInvalid()) 9461 Invalid = true; 9462 else { 9463 Statements.push_back(Return.takeAs<Stmt>()); 9464 9465 if (Trap.hasErrorOccurred()) { 9466 Diag(CurrentLocation, diag::note_member_synthesized_at) 9467 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9468 Invalid = true; 9469 } 9470 } 9471 } 9472 9473 if (Invalid) { 9474 MoveAssignOperator->setInvalidDecl(); 9475 return; 9476 } 9477 9478 StmtResult Body; 9479 { 9480 CompoundScopeRAII CompoundScope(*this); 9481 Body = ActOnCompoundStmt(Loc, Loc, Statements, 9482 /*isStmtExpr=*/false); 9483 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 9484 } 9485 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 9486 9487 if (ASTMutationListener *L = getASTMutationListener()) { 9488 L->CompletedImplicitDefinition(MoveAssignOperator); 9489 } 9490} 9491 9492Sema::ImplicitExceptionSpecification 9493Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 9494 CXXRecordDecl *ClassDecl = MD->getParent(); 9495 9496 ImplicitExceptionSpecification ExceptSpec(*this); 9497 if (ClassDecl->isInvalidDecl()) 9498 return ExceptSpec; 9499 9500 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 9501 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 9502 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 9503 9504 // C++ [except.spec]p14: 9505 // An implicitly declared special member function (Clause 12) shall have an 9506 // exception-specification. [...] 9507 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9508 BaseEnd = ClassDecl->bases_end(); 9509 Base != BaseEnd; 9510 ++Base) { 9511 // Virtual bases are handled below. 9512 if (Base->isVirtual()) 9513 continue; 9514 9515 CXXRecordDecl *BaseClassDecl 9516 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9517 if (CXXConstructorDecl *CopyConstructor = 9518 LookupCopyingConstructor(BaseClassDecl, Quals)) 9519 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 9520 } 9521 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9522 BaseEnd = ClassDecl->vbases_end(); 9523 Base != BaseEnd; 9524 ++Base) { 9525 CXXRecordDecl *BaseClassDecl 9526 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9527 if (CXXConstructorDecl *CopyConstructor = 9528 LookupCopyingConstructor(BaseClassDecl, Quals)) 9529 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 9530 } 9531 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9532 FieldEnd = ClassDecl->field_end(); 9533 Field != FieldEnd; 9534 ++Field) { 9535 QualType FieldType = Context.getBaseElementType(Field->getType()); 9536 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 9537 if (CXXConstructorDecl *CopyConstructor = 9538 LookupCopyingConstructor(FieldClassDecl, 9539 Quals | FieldType.getCVRQualifiers())) 9540 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 9541 } 9542 } 9543 9544 return ExceptSpec; 9545} 9546 9547CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 9548 CXXRecordDecl *ClassDecl) { 9549 // C++ [class.copy]p4: 9550 // If the class definition does not explicitly declare a copy 9551 // constructor, one is declared implicitly. 9552 assert(ClassDecl->needsImplicitCopyConstructor()); 9553 9554 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyConstructor); 9555 if (DSM.isAlreadyBeingDeclared()) 9556 return 0; 9557 9558 QualType ClassType = Context.getTypeDeclType(ClassDecl); 9559 QualType ArgType = ClassType; 9560 bool Const = ClassDecl->implicitCopyConstructorHasConstParam(); 9561 if (Const) 9562 ArgType = ArgType.withConst(); 9563 ArgType = Context.getLValueReferenceType(ArgType); 9564 9565 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9566 CXXCopyConstructor, 9567 Const); 9568 9569 DeclarationName Name 9570 = Context.DeclarationNames.getCXXConstructorName( 9571 Context.getCanonicalType(ClassType)); 9572 SourceLocation ClassLoc = ClassDecl->getLocation(); 9573 DeclarationNameInfo NameInfo(Name, ClassLoc); 9574 9575 // An implicitly-declared copy constructor is an inline public 9576 // member of its class. 9577 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 9578 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 9579 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 9580 Constexpr); 9581 CopyConstructor->setAccess(AS_public); 9582 CopyConstructor->setDefaulted(); 9583 9584 // Build an exception specification pointing back at this member. 9585 FunctionProtoType::ExtProtoInfo EPI; 9586 EPI.ExceptionSpecType = EST_Unevaluated; 9587 EPI.ExceptionSpecDecl = CopyConstructor; 9588 CopyConstructor->setType( 9589 Context.getFunctionType(Context.VoidTy, ArgType, EPI)); 9590 9591 // Add the parameter to the constructor. 9592 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 9593 ClassLoc, ClassLoc, 9594 /*IdentifierInfo=*/0, 9595 ArgType, /*TInfo=*/0, 9596 SC_None, 0); 9597 CopyConstructor->setParams(FromParam); 9598 9599 CopyConstructor->setTrivial( 9600 ClassDecl->needsOverloadResolutionForCopyConstructor() 9601 ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor) 9602 : ClassDecl->hasTrivialCopyConstructor()); 9603 9604 // C++11 [class.copy]p8: 9605 // ... If the class definition does not explicitly declare a copy 9606 // constructor, there is no user-declared move constructor, and there is no 9607 // user-declared move assignment operator, a copy constructor is implicitly 9608 // declared as defaulted. 9609 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 9610 SetDeclDeleted(CopyConstructor, ClassLoc); 9611 9612 // Note that we have declared this constructor. 9613 ++ASTContext::NumImplicitCopyConstructorsDeclared; 9614 9615 if (Scope *S = getScopeForContext(ClassDecl)) 9616 PushOnScopeChains(CopyConstructor, S, false); 9617 ClassDecl->addDecl(CopyConstructor); 9618 9619 return CopyConstructor; 9620} 9621 9622void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 9623 CXXConstructorDecl *CopyConstructor) { 9624 assert((CopyConstructor->isDefaulted() && 9625 CopyConstructor->isCopyConstructor() && 9626 !CopyConstructor->doesThisDeclarationHaveABody() && 9627 !CopyConstructor->isDeleted()) && 9628 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 9629 9630 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 9631 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 9632 9633 SynthesizedFunctionScope Scope(*this, CopyConstructor); 9634 DiagnosticErrorTrap Trap(Diags); 9635 9636 if (SetCtorInitializers(CopyConstructor, /*AnyErrors=*/false) || 9637 Trap.hasErrorOccurred()) { 9638 Diag(CurrentLocation, diag::note_member_synthesized_at) 9639 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 9640 CopyConstructor->setInvalidDecl(); 9641 } else { 9642 Sema::CompoundScopeRAII CompoundScope(*this); 9643 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 9644 CopyConstructor->getLocation(), 9645 MultiStmtArg(), 9646 /*isStmtExpr=*/false) 9647 .takeAs<Stmt>()); 9648 CopyConstructor->setImplicitlyDefined(true); 9649 } 9650 9651 CopyConstructor->setUsed(); 9652 if (ASTMutationListener *L = getASTMutationListener()) { 9653 L->CompletedImplicitDefinition(CopyConstructor); 9654 } 9655} 9656 9657Sema::ImplicitExceptionSpecification 9658Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 9659 CXXRecordDecl *ClassDecl = MD->getParent(); 9660 9661 // C++ [except.spec]p14: 9662 // An implicitly declared special member function (Clause 12) shall have an 9663 // exception-specification. [...] 9664 ImplicitExceptionSpecification ExceptSpec(*this); 9665 if (ClassDecl->isInvalidDecl()) 9666 return ExceptSpec; 9667 9668 // Direct base-class constructors. 9669 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 9670 BEnd = ClassDecl->bases_end(); 9671 B != BEnd; ++B) { 9672 if (B->isVirtual()) // Handled below. 9673 continue; 9674 9675 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 9676 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 9677 CXXConstructorDecl *Constructor = 9678 LookupMovingConstructor(BaseClassDecl, 0); 9679 // If this is a deleted function, add it anyway. This might be conformant 9680 // with the standard. This might not. I'm not sure. It might not matter. 9681 if (Constructor) 9682 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 9683 } 9684 } 9685 9686 // Virtual base-class constructors. 9687 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 9688 BEnd = ClassDecl->vbases_end(); 9689 B != BEnd; ++B) { 9690 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 9691 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 9692 CXXConstructorDecl *Constructor = 9693 LookupMovingConstructor(BaseClassDecl, 0); 9694 // If this is a deleted function, add it anyway. This might be conformant 9695 // with the standard. This might not. I'm not sure. It might not matter. 9696 if (Constructor) 9697 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 9698 } 9699 } 9700 9701 // Field constructors. 9702 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 9703 FEnd = ClassDecl->field_end(); 9704 F != FEnd; ++F) { 9705 QualType FieldType = Context.getBaseElementType(F->getType()); 9706 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 9707 CXXConstructorDecl *Constructor = 9708 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 9709 // If this is a deleted function, add it anyway. This might be conformant 9710 // with the standard. This might not. I'm not sure. It might not matter. 9711 // In particular, the problem is that this function never gets called. It 9712 // might just be ill-formed because this function attempts to refer to 9713 // a deleted function here. 9714 if (Constructor) 9715 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 9716 } 9717 } 9718 9719 return ExceptSpec; 9720} 9721 9722CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 9723 CXXRecordDecl *ClassDecl) { 9724 // C++11 [class.copy]p9: 9725 // If the definition of a class X does not explicitly declare a move 9726 // constructor, one will be implicitly declared as defaulted if and only if: 9727 // 9728 // - [first 4 bullets] 9729 assert(ClassDecl->needsImplicitMoveConstructor()); 9730 9731 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveConstructor); 9732 if (DSM.isAlreadyBeingDeclared()) 9733 return 0; 9734 9735 // [Checked after we build the declaration] 9736 // - the move assignment operator would not be implicitly defined as 9737 // deleted, 9738 9739 // [DR1402]: 9740 // - each of X's non-static data members and direct or virtual base classes 9741 // has a type that either has a move constructor or is trivially copyable. 9742 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 9743 ClassDecl->setFailedImplicitMoveConstructor(); 9744 return 0; 9745 } 9746 9747 QualType ClassType = Context.getTypeDeclType(ClassDecl); 9748 QualType ArgType = Context.getRValueReferenceType(ClassType); 9749 9750 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9751 CXXMoveConstructor, 9752 false); 9753 9754 DeclarationName Name 9755 = Context.DeclarationNames.getCXXConstructorName( 9756 Context.getCanonicalType(ClassType)); 9757 SourceLocation ClassLoc = ClassDecl->getLocation(); 9758 DeclarationNameInfo NameInfo(Name, ClassLoc); 9759 9760 // C++0x [class.copy]p11: 9761 // An implicitly-declared copy/move constructor is an inline public 9762 // member of its class. 9763 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 9764 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 9765 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 9766 Constexpr); 9767 MoveConstructor->setAccess(AS_public); 9768 MoveConstructor->setDefaulted(); 9769 9770 // Build an exception specification pointing back at this member. 9771 FunctionProtoType::ExtProtoInfo EPI; 9772 EPI.ExceptionSpecType = EST_Unevaluated; 9773 EPI.ExceptionSpecDecl = MoveConstructor; 9774 MoveConstructor->setType( 9775 Context.getFunctionType(Context.VoidTy, ArgType, EPI)); 9776 9777 // Add the parameter to the constructor. 9778 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 9779 ClassLoc, ClassLoc, 9780 /*IdentifierInfo=*/0, 9781 ArgType, /*TInfo=*/0, 9782 SC_None, 0); 9783 MoveConstructor->setParams(FromParam); 9784 9785 MoveConstructor->setTrivial( 9786 ClassDecl->needsOverloadResolutionForMoveConstructor() 9787 ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor) 9788 : ClassDecl->hasTrivialMoveConstructor()); 9789 9790 // C++0x [class.copy]p9: 9791 // If the definition of a class X does not explicitly declare a move 9792 // constructor, one will be implicitly declared as defaulted if and only if: 9793 // [...] 9794 // - the move constructor would not be implicitly defined as deleted. 9795 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 9796 // Cache this result so that we don't try to generate this over and over 9797 // on every lookup, leaking memory and wasting time. 9798 ClassDecl->setFailedImplicitMoveConstructor(); 9799 return 0; 9800 } 9801 9802 // Note that we have declared this constructor. 9803 ++ASTContext::NumImplicitMoveConstructorsDeclared; 9804 9805 if (Scope *S = getScopeForContext(ClassDecl)) 9806 PushOnScopeChains(MoveConstructor, S, false); 9807 ClassDecl->addDecl(MoveConstructor); 9808 9809 return MoveConstructor; 9810} 9811 9812void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 9813 CXXConstructorDecl *MoveConstructor) { 9814 assert((MoveConstructor->isDefaulted() && 9815 MoveConstructor->isMoveConstructor() && 9816 !MoveConstructor->doesThisDeclarationHaveABody() && 9817 !MoveConstructor->isDeleted()) && 9818 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 9819 9820 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 9821 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 9822 9823 SynthesizedFunctionScope Scope(*this, MoveConstructor); 9824 DiagnosticErrorTrap Trap(Diags); 9825 9826 if (SetCtorInitializers(MoveConstructor, /*AnyErrors=*/false) || 9827 Trap.hasErrorOccurred()) { 9828 Diag(CurrentLocation, diag::note_member_synthesized_at) 9829 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 9830 MoveConstructor->setInvalidDecl(); 9831 } else { 9832 Sema::CompoundScopeRAII CompoundScope(*this); 9833 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 9834 MoveConstructor->getLocation(), 9835 MultiStmtArg(), 9836 /*isStmtExpr=*/false) 9837 .takeAs<Stmt>()); 9838 MoveConstructor->setImplicitlyDefined(true); 9839 } 9840 9841 MoveConstructor->setUsed(); 9842 9843 if (ASTMutationListener *L = getASTMutationListener()) { 9844 L->CompletedImplicitDefinition(MoveConstructor); 9845 } 9846} 9847 9848bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 9849 return FD->isDeleted() && 9850 (FD->isDefaulted() || FD->isImplicit()) && 9851 isa<CXXMethodDecl>(FD); 9852} 9853 9854/// \brief Mark the call operator of the given lambda closure type as "used". 9855static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 9856 CXXMethodDecl *CallOperator 9857 = cast<CXXMethodDecl>( 9858 Lambda->lookup( 9859 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).front()); 9860 CallOperator->setReferenced(); 9861 CallOperator->setUsed(); 9862} 9863 9864void Sema::DefineImplicitLambdaToFunctionPointerConversion( 9865 SourceLocation CurrentLocation, 9866 CXXConversionDecl *Conv) 9867{ 9868 CXXRecordDecl *Lambda = Conv->getParent(); 9869 9870 // Make sure that the lambda call operator is marked used. 9871 markLambdaCallOperatorUsed(*this, Lambda); 9872 9873 Conv->setUsed(); 9874 9875 SynthesizedFunctionScope Scope(*this, Conv); 9876 DiagnosticErrorTrap Trap(Diags); 9877 9878 // Return the address of the __invoke function. 9879 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 9880 CXXMethodDecl *Invoke 9881 = cast<CXXMethodDecl>(Lambda->lookup(InvokeName).front()); 9882 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 9883 VK_LValue, Conv->getLocation()).take(); 9884 assert(FunctionRef && "Can't refer to __invoke function?"); 9885 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 9886 Conv->setBody(new (Context) CompoundStmt(Context, Return, 9887 Conv->getLocation(), 9888 Conv->getLocation())); 9889 9890 // Fill in the __invoke function with a dummy implementation. IR generation 9891 // will fill in the actual details. 9892 Invoke->setUsed(); 9893 Invoke->setReferenced(); 9894 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation())); 9895 9896 if (ASTMutationListener *L = getASTMutationListener()) { 9897 L->CompletedImplicitDefinition(Conv); 9898 L->CompletedImplicitDefinition(Invoke); 9899 } 9900} 9901 9902void Sema::DefineImplicitLambdaToBlockPointerConversion( 9903 SourceLocation CurrentLocation, 9904 CXXConversionDecl *Conv) 9905{ 9906 Conv->setUsed(); 9907 9908 SynthesizedFunctionScope Scope(*this, Conv); 9909 DiagnosticErrorTrap Trap(Diags); 9910 9911 // Copy-initialize the lambda object as needed to capture it. 9912 Expr *This = ActOnCXXThis(CurrentLocation).take(); 9913 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 9914 9915 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 9916 Conv->getLocation(), 9917 Conv, DerefThis); 9918 9919 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 9920 // behavior. Note that only the general conversion function does this 9921 // (since it's unusable otherwise); in the case where we inline the 9922 // block literal, it has block literal lifetime semantics. 9923 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 9924 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 9925 CK_CopyAndAutoreleaseBlockObject, 9926 BuildBlock.get(), 0, VK_RValue); 9927 9928 if (BuildBlock.isInvalid()) { 9929 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9930 Conv->setInvalidDecl(); 9931 return; 9932 } 9933 9934 // Create the return statement that returns the block from the conversion 9935 // function. 9936 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 9937 if (Return.isInvalid()) { 9938 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9939 Conv->setInvalidDecl(); 9940 return; 9941 } 9942 9943 // Set the body of the conversion function. 9944 Stmt *ReturnS = Return.take(); 9945 Conv->setBody(new (Context) CompoundStmt(Context, ReturnS, 9946 Conv->getLocation(), 9947 Conv->getLocation())); 9948 9949 // We're done; notify the mutation listener, if any. 9950 if (ASTMutationListener *L = getASTMutationListener()) { 9951 L->CompletedImplicitDefinition(Conv); 9952 } 9953} 9954 9955/// \brief Determine whether the given list arguments contains exactly one 9956/// "real" (non-default) argument. 9957static bool hasOneRealArgument(MultiExprArg Args) { 9958 switch (Args.size()) { 9959 case 0: 9960 return false; 9961 9962 default: 9963 if (!Args[1]->isDefaultArgument()) 9964 return false; 9965 9966 // fall through 9967 case 1: 9968 return !Args[0]->isDefaultArgument(); 9969 } 9970 9971 return false; 9972} 9973 9974ExprResult 9975Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9976 CXXConstructorDecl *Constructor, 9977 MultiExprArg ExprArgs, 9978 bool HadMultipleCandidates, 9979 bool IsListInitialization, 9980 bool RequiresZeroInit, 9981 unsigned ConstructKind, 9982 SourceRange ParenRange) { 9983 bool Elidable = false; 9984 9985 // C++0x [class.copy]p34: 9986 // When certain criteria are met, an implementation is allowed to 9987 // omit the copy/move construction of a class object, even if the 9988 // copy/move constructor and/or destructor for the object have 9989 // side effects. [...] 9990 // - when a temporary class object that has not been bound to a 9991 // reference (12.2) would be copied/moved to a class object 9992 // with the same cv-unqualified type, the copy/move operation 9993 // can be omitted by constructing the temporary object 9994 // directly into the target of the omitted copy/move 9995 if (ConstructKind == CXXConstructExpr::CK_Complete && 9996 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9997 Expr *SubExpr = ExprArgs[0]; 9998 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9999 } 10000 10001 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 10002 Elidable, ExprArgs, HadMultipleCandidates, 10003 IsListInitialization, RequiresZeroInit, 10004 ConstructKind, ParenRange); 10005} 10006 10007/// BuildCXXConstructExpr - Creates a complete call to a constructor, 10008/// including handling of its default argument expressions. 10009ExprResult 10010Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 10011 CXXConstructorDecl *Constructor, bool Elidable, 10012 MultiExprArg ExprArgs, 10013 bool HadMultipleCandidates, 10014 bool IsListInitialization, 10015 bool RequiresZeroInit, 10016 unsigned ConstructKind, 10017 SourceRange ParenRange) { 10018 MarkFunctionReferenced(ConstructLoc, Constructor); 10019 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 10020 Constructor, Elidable, ExprArgs, 10021 HadMultipleCandidates, 10022 IsListInitialization, RequiresZeroInit, 10023 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 10024 ParenRange)); 10025} 10026 10027void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 10028 if (VD->isInvalidDecl()) return; 10029 10030 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 10031 if (ClassDecl->isInvalidDecl()) return; 10032 if (ClassDecl->hasIrrelevantDestructor()) return; 10033 if (ClassDecl->isDependentContext()) return; 10034 10035 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 10036 MarkFunctionReferenced(VD->getLocation(), Destructor); 10037 CheckDestructorAccess(VD->getLocation(), Destructor, 10038 PDiag(diag::err_access_dtor_var) 10039 << VD->getDeclName() 10040 << VD->getType()); 10041 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 10042 10043 if (!VD->hasGlobalStorage()) return; 10044 10045 // Emit warning for non-trivial dtor in global scope (a real global, 10046 // class-static, function-static). 10047 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 10048 10049 // TODO: this should be re-enabled for static locals by !CXAAtExit 10050 if (!VD->isStaticLocal()) 10051 Diag(VD->getLocation(), diag::warn_global_destructor); 10052} 10053 10054/// \brief Given a constructor and the set of arguments provided for the 10055/// constructor, convert the arguments and add any required default arguments 10056/// to form a proper call to this constructor. 10057/// 10058/// \returns true if an error occurred, false otherwise. 10059bool 10060Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 10061 MultiExprArg ArgsPtr, 10062 SourceLocation Loc, 10063 SmallVectorImpl<Expr*> &ConvertedArgs, 10064 bool AllowExplicit, 10065 bool IsListInitialization) { 10066 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 10067 unsigned NumArgs = ArgsPtr.size(); 10068 Expr **Args = ArgsPtr.data(); 10069 10070 const FunctionProtoType *Proto 10071 = Constructor->getType()->getAs<FunctionProtoType>(); 10072 assert(Proto && "Constructor without a prototype?"); 10073 unsigned NumArgsInProto = Proto->getNumArgs(); 10074 10075 // If too few arguments are available, we'll fill in the rest with defaults. 10076 if (NumArgs < NumArgsInProto) 10077 ConvertedArgs.reserve(NumArgsInProto); 10078 else 10079 ConvertedArgs.reserve(NumArgs); 10080 10081 VariadicCallType CallType = 10082 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 10083 SmallVector<Expr *, 8> AllArgs; 10084 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 10085 Proto, 0, Args, NumArgs, AllArgs, 10086 CallType, AllowExplicit, 10087 IsListInitialization); 10088 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 10089 10090 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 10091 10092 CheckConstructorCall(Constructor, 10093 llvm::makeArrayRef<const Expr *>(AllArgs.data(), 10094 AllArgs.size()), 10095 Proto, Loc); 10096 10097 return Invalid; 10098} 10099 10100static inline bool 10101CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 10102 const FunctionDecl *FnDecl) { 10103 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 10104 if (isa<NamespaceDecl>(DC)) { 10105 return SemaRef.Diag(FnDecl->getLocation(), 10106 diag::err_operator_new_delete_declared_in_namespace) 10107 << FnDecl->getDeclName(); 10108 } 10109 10110 if (isa<TranslationUnitDecl>(DC) && 10111 FnDecl->getStorageClass() == SC_Static) { 10112 return SemaRef.Diag(FnDecl->getLocation(), 10113 diag::err_operator_new_delete_declared_static) 10114 << FnDecl->getDeclName(); 10115 } 10116 10117 return false; 10118} 10119 10120static inline bool 10121CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 10122 CanQualType ExpectedResultType, 10123 CanQualType ExpectedFirstParamType, 10124 unsigned DependentParamTypeDiag, 10125 unsigned InvalidParamTypeDiag) { 10126 QualType ResultType = 10127 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 10128 10129 // Check that the result type is not dependent. 10130 if (ResultType->isDependentType()) 10131 return SemaRef.Diag(FnDecl->getLocation(), 10132 diag::err_operator_new_delete_dependent_result_type) 10133 << FnDecl->getDeclName() << ExpectedResultType; 10134 10135 // Check that the result type is what we expect. 10136 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 10137 return SemaRef.Diag(FnDecl->getLocation(), 10138 diag::err_operator_new_delete_invalid_result_type) 10139 << FnDecl->getDeclName() << ExpectedResultType; 10140 10141 // A function template must have at least 2 parameters. 10142 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 10143 return SemaRef.Diag(FnDecl->getLocation(), 10144 diag::err_operator_new_delete_template_too_few_parameters) 10145 << FnDecl->getDeclName(); 10146 10147 // The function decl must have at least 1 parameter. 10148 if (FnDecl->getNumParams() == 0) 10149 return SemaRef.Diag(FnDecl->getLocation(), 10150 diag::err_operator_new_delete_too_few_parameters) 10151 << FnDecl->getDeclName(); 10152 10153 // Check the first parameter type is not dependent. 10154 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 10155 if (FirstParamType->isDependentType()) 10156 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 10157 << FnDecl->getDeclName() << ExpectedFirstParamType; 10158 10159 // Check that the first parameter type is what we expect. 10160 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 10161 ExpectedFirstParamType) 10162 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 10163 << FnDecl->getDeclName() << ExpectedFirstParamType; 10164 10165 return false; 10166} 10167 10168static bool 10169CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 10170 // C++ [basic.stc.dynamic.allocation]p1: 10171 // A program is ill-formed if an allocation function is declared in a 10172 // namespace scope other than global scope or declared static in global 10173 // scope. 10174 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 10175 return true; 10176 10177 CanQualType SizeTy = 10178 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 10179 10180 // C++ [basic.stc.dynamic.allocation]p1: 10181 // The return type shall be void*. The first parameter shall have type 10182 // std::size_t. 10183 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 10184 SizeTy, 10185 diag::err_operator_new_dependent_param_type, 10186 diag::err_operator_new_param_type)) 10187 return true; 10188 10189 // C++ [basic.stc.dynamic.allocation]p1: 10190 // The first parameter shall not have an associated default argument. 10191 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 10192 return SemaRef.Diag(FnDecl->getLocation(), 10193 diag::err_operator_new_default_arg) 10194 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 10195 10196 return false; 10197} 10198 10199static bool 10200CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) { 10201 // C++ [basic.stc.dynamic.deallocation]p1: 10202 // A program is ill-formed if deallocation functions are declared in a 10203 // namespace scope other than global scope or declared static in global 10204 // scope. 10205 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 10206 return true; 10207 10208 // C++ [basic.stc.dynamic.deallocation]p2: 10209 // Each deallocation function shall return void and its first parameter 10210 // shall be void*. 10211 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 10212 SemaRef.Context.VoidPtrTy, 10213 diag::err_operator_delete_dependent_param_type, 10214 diag::err_operator_delete_param_type)) 10215 return true; 10216 10217 return false; 10218} 10219 10220/// CheckOverloadedOperatorDeclaration - Check whether the declaration 10221/// of this overloaded operator is well-formed. If so, returns false; 10222/// otherwise, emits appropriate diagnostics and returns true. 10223bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 10224 assert(FnDecl && FnDecl->isOverloadedOperator() && 10225 "Expected an overloaded operator declaration"); 10226 10227 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 10228 10229 // C++ [over.oper]p5: 10230 // The allocation and deallocation functions, operator new, 10231 // operator new[], operator delete and operator delete[], are 10232 // described completely in 3.7.3. The attributes and restrictions 10233 // found in the rest of this subclause do not apply to them unless 10234 // explicitly stated in 3.7.3. 10235 if (Op == OO_Delete || Op == OO_Array_Delete) 10236 return CheckOperatorDeleteDeclaration(*this, FnDecl); 10237 10238 if (Op == OO_New || Op == OO_Array_New) 10239 return CheckOperatorNewDeclaration(*this, FnDecl); 10240 10241 // C++ [over.oper]p6: 10242 // An operator function shall either be a non-static member 10243 // function or be a non-member function and have at least one 10244 // parameter whose type is a class, a reference to a class, an 10245 // enumeration, or a reference to an enumeration. 10246 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 10247 if (MethodDecl->isStatic()) 10248 return Diag(FnDecl->getLocation(), 10249 diag::err_operator_overload_static) << FnDecl->getDeclName(); 10250 } else { 10251 bool ClassOrEnumParam = false; 10252 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 10253 ParamEnd = FnDecl->param_end(); 10254 Param != ParamEnd; ++Param) { 10255 QualType ParamType = (*Param)->getType().getNonReferenceType(); 10256 if (ParamType->isDependentType() || ParamType->isRecordType() || 10257 ParamType->isEnumeralType()) { 10258 ClassOrEnumParam = true; 10259 break; 10260 } 10261 } 10262 10263 if (!ClassOrEnumParam) 10264 return Diag(FnDecl->getLocation(), 10265 diag::err_operator_overload_needs_class_or_enum) 10266 << FnDecl->getDeclName(); 10267 } 10268 10269 // C++ [over.oper]p8: 10270 // An operator function cannot have default arguments (8.3.6), 10271 // except where explicitly stated below. 10272 // 10273 // Only the function-call operator allows default arguments 10274 // (C++ [over.call]p1). 10275 if (Op != OO_Call) { 10276 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 10277 Param != FnDecl->param_end(); ++Param) { 10278 if ((*Param)->hasDefaultArg()) 10279 return Diag((*Param)->getLocation(), 10280 diag::err_operator_overload_default_arg) 10281 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 10282 } 10283 } 10284 10285 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 10286 { false, false, false } 10287#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 10288 , { Unary, Binary, MemberOnly } 10289#include "clang/Basic/OperatorKinds.def" 10290 }; 10291 10292 bool CanBeUnaryOperator = OperatorUses[Op][0]; 10293 bool CanBeBinaryOperator = OperatorUses[Op][1]; 10294 bool MustBeMemberOperator = OperatorUses[Op][2]; 10295 10296 // C++ [over.oper]p8: 10297 // [...] Operator functions cannot have more or fewer parameters 10298 // than the number required for the corresponding operator, as 10299 // described in the rest of this subclause. 10300 unsigned NumParams = FnDecl->getNumParams() 10301 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 10302 if (Op != OO_Call && 10303 ((NumParams == 1 && !CanBeUnaryOperator) || 10304 (NumParams == 2 && !CanBeBinaryOperator) || 10305 (NumParams < 1) || (NumParams > 2))) { 10306 // We have the wrong number of parameters. 10307 unsigned ErrorKind; 10308 if (CanBeUnaryOperator && CanBeBinaryOperator) { 10309 ErrorKind = 2; // 2 -> unary or binary. 10310 } else if (CanBeUnaryOperator) { 10311 ErrorKind = 0; // 0 -> unary 10312 } else { 10313 assert(CanBeBinaryOperator && 10314 "All non-call overloaded operators are unary or binary!"); 10315 ErrorKind = 1; // 1 -> binary 10316 } 10317 10318 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 10319 << FnDecl->getDeclName() << NumParams << ErrorKind; 10320 } 10321 10322 // Overloaded operators other than operator() cannot be variadic. 10323 if (Op != OO_Call && 10324 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 10325 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 10326 << FnDecl->getDeclName(); 10327 } 10328 10329 // Some operators must be non-static member functions. 10330 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 10331 return Diag(FnDecl->getLocation(), 10332 diag::err_operator_overload_must_be_member) 10333 << FnDecl->getDeclName(); 10334 } 10335 10336 // C++ [over.inc]p1: 10337 // The user-defined function called operator++ implements the 10338 // prefix and postfix ++ operator. If this function is a member 10339 // function with no parameters, or a non-member function with one 10340 // parameter of class or enumeration type, it defines the prefix 10341 // increment operator ++ for objects of that type. If the function 10342 // is a member function with one parameter (which shall be of type 10343 // int) or a non-member function with two parameters (the second 10344 // of which shall be of type int), it defines the postfix 10345 // increment operator ++ for objects of that type. 10346 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 10347 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 10348 bool ParamIsInt = false; 10349 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 10350 ParamIsInt = BT->getKind() == BuiltinType::Int; 10351 10352 if (!ParamIsInt) 10353 return Diag(LastParam->getLocation(), 10354 diag::err_operator_overload_post_incdec_must_be_int) 10355 << LastParam->getType() << (Op == OO_MinusMinus); 10356 } 10357 10358 return false; 10359} 10360 10361/// CheckLiteralOperatorDeclaration - Check whether the declaration 10362/// of this literal operator function is well-formed. If so, returns 10363/// false; otherwise, emits appropriate diagnostics and returns true. 10364bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 10365 if (isa<CXXMethodDecl>(FnDecl)) { 10366 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 10367 << FnDecl->getDeclName(); 10368 return true; 10369 } 10370 10371 if (FnDecl->isExternC()) { 10372 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 10373 return true; 10374 } 10375 10376 bool Valid = false; 10377 10378 // This might be the definition of a literal operator template. 10379 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 10380 // This might be a specialization of a literal operator template. 10381 if (!TpDecl) 10382 TpDecl = FnDecl->getPrimaryTemplate(); 10383 10384 // template <char...> type operator "" name() is the only valid template 10385 // signature, and the only valid signature with no parameters. 10386 if (TpDecl) { 10387 if (FnDecl->param_size() == 0) { 10388 // Must have only one template parameter 10389 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 10390 if (Params->size() == 1) { 10391 NonTypeTemplateParmDecl *PmDecl = 10392 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 10393 10394 // The template parameter must be a char parameter pack. 10395 if (PmDecl && PmDecl->isTemplateParameterPack() && 10396 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 10397 Valid = true; 10398 } 10399 } 10400 } else if (FnDecl->param_size()) { 10401 // Check the first parameter 10402 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 10403 10404 QualType T = (*Param)->getType().getUnqualifiedType(); 10405 10406 // unsigned long long int, long double, and any character type are allowed 10407 // as the only parameters. 10408 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 10409 Context.hasSameType(T, Context.LongDoubleTy) || 10410 Context.hasSameType(T, Context.CharTy) || 10411 Context.hasSameType(T, Context.WCharTy) || 10412 Context.hasSameType(T, Context.Char16Ty) || 10413 Context.hasSameType(T, Context.Char32Ty)) { 10414 if (++Param == FnDecl->param_end()) 10415 Valid = true; 10416 goto FinishedParams; 10417 } 10418 10419 // Otherwise it must be a pointer to const; let's strip those qualifiers. 10420 const PointerType *PT = T->getAs<PointerType>(); 10421 if (!PT) 10422 goto FinishedParams; 10423 T = PT->getPointeeType(); 10424 if (!T.isConstQualified() || T.isVolatileQualified()) 10425 goto FinishedParams; 10426 T = T.getUnqualifiedType(); 10427 10428 // Move on to the second parameter; 10429 ++Param; 10430 10431 // If there is no second parameter, the first must be a const char * 10432 if (Param == FnDecl->param_end()) { 10433 if (Context.hasSameType(T, Context.CharTy)) 10434 Valid = true; 10435 goto FinishedParams; 10436 } 10437 10438 // const char *, const wchar_t*, const char16_t*, and const char32_t* 10439 // are allowed as the first parameter to a two-parameter function 10440 if (!(Context.hasSameType(T, Context.CharTy) || 10441 Context.hasSameType(T, Context.WCharTy) || 10442 Context.hasSameType(T, Context.Char16Ty) || 10443 Context.hasSameType(T, Context.Char32Ty))) 10444 goto FinishedParams; 10445 10446 // The second and final parameter must be an std::size_t 10447 T = (*Param)->getType().getUnqualifiedType(); 10448 if (Context.hasSameType(T, Context.getSizeType()) && 10449 ++Param == FnDecl->param_end()) 10450 Valid = true; 10451 } 10452 10453 // FIXME: This diagnostic is absolutely terrible. 10454FinishedParams: 10455 if (!Valid) { 10456 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 10457 << FnDecl->getDeclName(); 10458 return true; 10459 } 10460 10461 // A parameter-declaration-clause containing a default argument is not 10462 // equivalent to any of the permitted forms. 10463 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 10464 ParamEnd = FnDecl->param_end(); 10465 Param != ParamEnd; ++Param) { 10466 if ((*Param)->hasDefaultArg()) { 10467 Diag((*Param)->getDefaultArgRange().getBegin(), 10468 diag::err_literal_operator_default_argument) 10469 << (*Param)->getDefaultArgRange(); 10470 break; 10471 } 10472 } 10473 10474 StringRef LiteralName 10475 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 10476 if (LiteralName[0] != '_') { 10477 // C++11 [usrlit.suffix]p1: 10478 // Literal suffix identifiers that do not start with an underscore 10479 // are reserved for future standardization. 10480 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 10481 } 10482 10483 return false; 10484} 10485 10486/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 10487/// linkage specification, including the language and (if present) 10488/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 10489/// the location of the language string literal, which is provided 10490/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 10491/// the '{' brace. Otherwise, this linkage specification does not 10492/// have any braces. 10493Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 10494 SourceLocation LangLoc, 10495 StringRef Lang, 10496 SourceLocation LBraceLoc) { 10497 LinkageSpecDecl::LanguageIDs Language; 10498 if (Lang == "\"C\"") 10499 Language = LinkageSpecDecl::lang_c; 10500 else if (Lang == "\"C++\"") 10501 Language = LinkageSpecDecl::lang_cxx; 10502 else { 10503 Diag(LangLoc, diag::err_bad_language); 10504 return 0; 10505 } 10506 10507 // FIXME: Add all the various semantics of linkage specifications 10508 10509 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 10510 ExternLoc, LangLoc, Language, 10511 LBraceLoc.isValid()); 10512 CurContext->addDecl(D); 10513 PushDeclContext(S, D); 10514 return D; 10515} 10516 10517/// ActOnFinishLinkageSpecification - Complete the definition of 10518/// the C++ linkage specification LinkageSpec. If RBraceLoc is 10519/// valid, it's the position of the closing '}' brace in a linkage 10520/// specification that uses braces. 10521Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 10522 Decl *LinkageSpec, 10523 SourceLocation RBraceLoc) { 10524 if (LinkageSpec) { 10525 if (RBraceLoc.isValid()) { 10526 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 10527 LSDecl->setRBraceLoc(RBraceLoc); 10528 } 10529 PopDeclContext(); 10530 } 10531 return LinkageSpec; 10532} 10533 10534Decl *Sema::ActOnEmptyDeclaration(Scope *S, 10535 AttributeList *AttrList, 10536 SourceLocation SemiLoc) { 10537 Decl *ED = EmptyDecl::Create(Context, CurContext, SemiLoc); 10538 // Attribute declarations appertain to empty declaration so we handle 10539 // them here. 10540 if (AttrList) 10541 ProcessDeclAttributeList(S, ED, AttrList); 10542 10543 CurContext->addDecl(ED); 10544 return ED; 10545} 10546 10547/// \brief Perform semantic analysis for the variable declaration that 10548/// occurs within a C++ catch clause, returning the newly-created 10549/// variable. 10550VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 10551 TypeSourceInfo *TInfo, 10552 SourceLocation StartLoc, 10553 SourceLocation Loc, 10554 IdentifierInfo *Name) { 10555 bool Invalid = false; 10556 QualType ExDeclType = TInfo->getType(); 10557 10558 // Arrays and functions decay. 10559 if (ExDeclType->isArrayType()) 10560 ExDeclType = Context.getArrayDecayedType(ExDeclType); 10561 else if (ExDeclType->isFunctionType()) 10562 ExDeclType = Context.getPointerType(ExDeclType); 10563 10564 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 10565 // The exception-declaration shall not denote a pointer or reference to an 10566 // incomplete type, other than [cv] void*. 10567 // N2844 forbids rvalue references. 10568 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 10569 Diag(Loc, diag::err_catch_rvalue_ref); 10570 Invalid = true; 10571 } 10572 10573 QualType BaseType = ExDeclType; 10574 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 10575 unsigned DK = diag::err_catch_incomplete; 10576 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 10577 BaseType = Ptr->getPointeeType(); 10578 Mode = 1; 10579 DK = diag::err_catch_incomplete_ptr; 10580 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 10581 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 10582 BaseType = Ref->getPointeeType(); 10583 Mode = 2; 10584 DK = diag::err_catch_incomplete_ref; 10585 } 10586 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 10587 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 10588 Invalid = true; 10589 10590 if (!Invalid && !ExDeclType->isDependentType() && 10591 RequireNonAbstractType(Loc, ExDeclType, 10592 diag::err_abstract_type_in_decl, 10593 AbstractVariableType)) 10594 Invalid = true; 10595 10596 // Only the non-fragile NeXT runtime currently supports C++ catches 10597 // of ObjC types, and no runtime supports catching ObjC types by value. 10598 if (!Invalid && getLangOpts().ObjC1) { 10599 QualType T = ExDeclType; 10600 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 10601 T = RT->getPointeeType(); 10602 10603 if (T->isObjCObjectType()) { 10604 Diag(Loc, diag::err_objc_object_catch); 10605 Invalid = true; 10606 } else if (T->isObjCObjectPointerType()) { 10607 // FIXME: should this be a test for macosx-fragile specifically? 10608 if (getLangOpts().ObjCRuntime.isFragile()) 10609 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 10610 } 10611 } 10612 10613 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 10614 ExDeclType, TInfo, SC_None); 10615 ExDecl->setExceptionVariable(true); 10616 10617 // In ARC, infer 'retaining' for variables of retainable type. 10618 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 10619 Invalid = true; 10620 10621 if (!Invalid && !ExDeclType->isDependentType()) { 10622 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 10623 // Insulate this from anything else we might currently be parsing. 10624 EnterExpressionEvaluationContext scope(*this, PotentiallyEvaluated); 10625 10626 // C++ [except.handle]p16: 10627 // The object declared in an exception-declaration or, if the 10628 // exception-declaration does not specify a name, a temporary (12.2) is 10629 // copy-initialized (8.5) from the exception object. [...] 10630 // The object is destroyed when the handler exits, after the destruction 10631 // of any automatic objects initialized within the handler. 10632 // 10633 // We just pretend to initialize the object with itself, then make sure 10634 // it can be destroyed later. 10635 QualType initType = ExDeclType; 10636 10637 InitializedEntity entity = 10638 InitializedEntity::InitializeVariable(ExDecl); 10639 InitializationKind initKind = 10640 InitializationKind::CreateCopy(Loc, SourceLocation()); 10641 10642 Expr *opaqueValue = 10643 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 10644 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 10645 ExprResult result = sequence.Perform(*this, entity, initKind, 10646 MultiExprArg(&opaqueValue, 1)); 10647 if (result.isInvalid()) 10648 Invalid = true; 10649 else { 10650 // If the constructor used was non-trivial, set this as the 10651 // "initializer". 10652 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 10653 if (!construct->getConstructor()->isTrivial()) { 10654 Expr *init = MaybeCreateExprWithCleanups(construct); 10655 ExDecl->setInit(init); 10656 } 10657 10658 // And make sure it's destructable. 10659 FinalizeVarWithDestructor(ExDecl, recordType); 10660 } 10661 } 10662 } 10663 10664 if (Invalid) 10665 ExDecl->setInvalidDecl(); 10666 10667 return ExDecl; 10668} 10669 10670/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 10671/// handler. 10672Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 10673 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10674 bool Invalid = D.isInvalidType(); 10675 10676 // Check for unexpanded parameter packs. 10677 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 10678 UPPC_ExceptionType)) { 10679 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 10680 D.getIdentifierLoc()); 10681 Invalid = true; 10682 } 10683 10684 IdentifierInfo *II = D.getIdentifier(); 10685 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 10686 LookupOrdinaryName, 10687 ForRedeclaration)) { 10688 // The scope should be freshly made just for us. There is just no way 10689 // it contains any previous declaration. 10690 assert(!S->isDeclScope(PrevDecl)); 10691 if (PrevDecl->isTemplateParameter()) { 10692 // Maybe we will complain about the shadowed template parameter. 10693 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 10694 PrevDecl = 0; 10695 } 10696 } 10697 10698 if (D.getCXXScopeSpec().isSet() && !Invalid) { 10699 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 10700 << D.getCXXScopeSpec().getRange(); 10701 Invalid = true; 10702 } 10703 10704 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 10705 D.getLocStart(), 10706 D.getIdentifierLoc(), 10707 D.getIdentifier()); 10708 if (Invalid) 10709 ExDecl->setInvalidDecl(); 10710 10711 // Add the exception declaration into this scope. 10712 if (II) 10713 PushOnScopeChains(ExDecl, S); 10714 else 10715 CurContext->addDecl(ExDecl); 10716 10717 ProcessDeclAttributes(S, ExDecl, D); 10718 return ExDecl; 10719} 10720 10721Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 10722 Expr *AssertExpr, 10723 Expr *AssertMessageExpr, 10724 SourceLocation RParenLoc) { 10725 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 10726 10727 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 10728 return 0; 10729 10730 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 10731 AssertMessage, RParenLoc, false); 10732} 10733 10734Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 10735 Expr *AssertExpr, 10736 StringLiteral *AssertMessage, 10737 SourceLocation RParenLoc, 10738 bool Failed) { 10739 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 10740 !Failed) { 10741 // In a static_assert-declaration, the constant-expression shall be a 10742 // constant expression that can be contextually converted to bool. 10743 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 10744 if (Converted.isInvalid()) 10745 Failed = true; 10746 10747 llvm::APSInt Cond; 10748 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 10749 diag::err_static_assert_expression_is_not_constant, 10750 /*AllowFold=*/false).isInvalid()) 10751 Failed = true; 10752 10753 if (!Failed && !Cond) { 10754 SmallString<256> MsgBuffer; 10755 llvm::raw_svector_ostream Msg(MsgBuffer); 10756 AssertMessage->printPretty(Msg, 0, getPrintingPolicy()); 10757 Diag(StaticAssertLoc, diag::err_static_assert_failed) 10758 << Msg.str() << AssertExpr->getSourceRange(); 10759 Failed = true; 10760 } 10761 } 10762 10763 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 10764 AssertExpr, AssertMessage, RParenLoc, 10765 Failed); 10766 10767 CurContext->addDecl(Decl); 10768 return Decl; 10769} 10770 10771/// \brief Perform semantic analysis of the given friend type declaration. 10772/// 10773/// \returns A friend declaration that. 10774FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart, 10775 SourceLocation FriendLoc, 10776 TypeSourceInfo *TSInfo) { 10777 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 10778 10779 QualType T = TSInfo->getType(); 10780 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 10781 10782 // C++03 [class.friend]p2: 10783 // An elaborated-type-specifier shall be used in a friend declaration 10784 // for a class.* 10785 // 10786 // * The class-key of the elaborated-type-specifier is required. 10787 if (!ActiveTemplateInstantiations.empty()) { 10788 // Do not complain about the form of friend template types during 10789 // template instantiation; we will already have complained when the 10790 // template was declared. 10791 } else { 10792 if (!T->isElaboratedTypeSpecifier()) { 10793 // If we evaluated the type to a record type, suggest putting 10794 // a tag in front. 10795 if (const RecordType *RT = T->getAs<RecordType>()) { 10796 RecordDecl *RD = RT->getDecl(); 10797 10798 std::string InsertionText = std::string(" ") + RD->getKindName(); 10799 10800 Diag(TypeRange.getBegin(), 10801 getLangOpts().CPlusPlus11 ? 10802 diag::warn_cxx98_compat_unelaborated_friend_type : 10803 diag::ext_unelaborated_friend_type) 10804 << (unsigned) RD->getTagKind() 10805 << T 10806 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 10807 InsertionText); 10808 } else { 10809 Diag(FriendLoc, 10810 getLangOpts().CPlusPlus11 ? 10811 diag::warn_cxx98_compat_nonclass_type_friend : 10812 diag::ext_nonclass_type_friend) 10813 << T 10814 << TypeRange; 10815 } 10816 } else if (T->getAs<EnumType>()) { 10817 Diag(FriendLoc, 10818 getLangOpts().CPlusPlus11 ? 10819 diag::warn_cxx98_compat_enum_friend : 10820 diag::ext_enum_friend) 10821 << T 10822 << TypeRange; 10823 } 10824 10825 // C++11 [class.friend]p3: 10826 // A friend declaration that does not declare a function shall have one 10827 // of the following forms: 10828 // friend elaborated-type-specifier ; 10829 // friend simple-type-specifier ; 10830 // friend typename-specifier ; 10831 if (getLangOpts().CPlusPlus11 && LocStart != FriendLoc) 10832 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T; 10833 } 10834 10835 // If the type specifier in a friend declaration designates a (possibly 10836 // cv-qualified) class type, that class is declared as a friend; otherwise, 10837 // the friend declaration is ignored. 10838 return FriendDecl::Create(Context, CurContext, LocStart, TSInfo, FriendLoc); 10839} 10840 10841/// Handle a friend tag declaration where the scope specifier was 10842/// templated. 10843Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 10844 unsigned TagSpec, SourceLocation TagLoc, 10845 CXXScopeSpec &SS, 10846 IdentifierInfo *Name, 10847 SourceLocation NameLoc, 10848 AttributeList *Attr, 10849 MultiTemplateParamsArg TempParamLists) { 10850 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 10851 10852 bool isExplicitSpecialization = false; 10853 bool Invalid = false; 10854 10855 if (TemplateParameterList *TemplateParams 10856 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 10857 TempParamLists.data(), 10858 TempParamLists.size(), 10859 /*friend*/ true, 10860 isExplicitSpecialization, 10861 Invalid)) { 10862 if (TemplateParams->size() > 0) { 10863 // This is a declaration of a class template. 10864 if (Invalid) 10865 return 0; 10866 10867 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 10868 SS, Name, NameLoc, Attr, 10869 TemplateParams, AS_public, 10870 /*ModulePrivateLoc=*/SourceLocation(), 10871 TempParamLists.size() - 1, 10872 TempParamLists.data()).take(); 10873 } else { 10874 // The "template<>" header is extraneous. 10875 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 10876 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 10877 isExplicitSpecialization = true; 10878 } 10879 } 10880 10881 if (Invalid) return 0; 10882 10883 bool isAllExplicitSpecializations = true; 10884 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 10885 if (TempParamLists[I]->size()) { 10886 isAllExplicitSpecializations = false; 10887 break; 10888 } 10889 } 10890 10891 // FIXME: don't ignore attributes. 10892 10893 // If it's explicit specializations all the way down, just forget 10894 // about the template header and build an appropriate non-templated 10895 // friend. TODO: for source fidelity, remember the headers. 10896 if (isAllExplicitSpecializations) { 10897 if (SS.isEmpty()) { 10898 bool Owned = false; 10899 bool IsDependent = false; 10900 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 10901 Attr, AS_public, 10902 /*ModulePrivateLoc=*/SourceLocation(), 10903 MultiTemplateParamsArg(), Owned, IsDependent, 10904 /*ScopedEnumKWLoc=*/SourceLocation(), 10905 /*ScopedEnumUsesClassTag=*/false, 10906 /*UnderlyingType=*/TypeResult()); 10907 } 10908 10909 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 10910 ElaboratedTypeKeyword Keyword 10911 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10912 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 10913 *Name, NameLoc); 10914 if (T.isNull()) 10915 return 0; 10916 10917 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10918 if (isa<DependentNameType>(T)) { 10919 DependentNameTypeLoc TL = 10920 TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); 10921 TL.setElaboratedKeywordLoc(TagLoc); 10922 TL.setQualifierLoc(QualifierLoc); 10923 TL.setNameLoc(NameLoc); 10924 } else { 10925 ElaboratedTypeLoc TL = TSI->getTypeLoc().castAs<ElaboratedTypeLoc>(); 10926 TL.setElaboratedKeywordLoc(TagLoc); 10927 TL.setQualifierLoc(QualifierLoc); 10928 TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(NameLoc); 10929 } 10930 10931 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10932 TSI, FriendLoc, TempParamLists); 10933 Friend->setAccess(AS_public); 10934 CurContext->addDecl(Friend); 10935 return Friend; 10936 } 10937 10938 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 10939 10940 10941 10942 // Handle the case of a templated-scope friend class. e.g. 10943 // template <class T> class A<T>::B; 10944 // FIXME: we don't support these right now. 10945 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10946 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10947 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10948 DependentNameTypeLoc TL = TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); 10949 TL.setElaboratedKeywordLoc(TagLoc); 10950 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10951 TL.setNameLoc(NameLoc); 10952 10953 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10954 TSI, FriendLoc, TempParamLists); 10955 Friend->setAccess(AS_public); 10956 Friend->setUnsupportedFriend(true); 10957 CurContext->addDecl(Friend); 10958 return Friend; 10959} 10960 10961 10962/// Handle a friend type declaration. This works in tandem with 10963/// ActOnTag. 10964/// 10965/// Notes on friend class templates: 10966/// 10967/// We generally treat friend class declarations as if they were 10968/// declaring a class. So, for example, the elaborated type specifier 10969/// in a friend declaration is required to obey the restrictions of a 10970/// class-head (i.e. no typedefs in the scope chain), template 10971/// parameters are required to match up with simple template-ids, &c. 10972/// However, unlike when declaring a template specialization, it's 10973/// okay to refer to a template specialization without an empty 10974/// template parameter declaration, e.g. 10975/// friend class A<T>::B<unsigned>; 10976/// We permit this as a special case; if there are any template 10977/// parameters present at all, require proper matching, i.e. 10978/// template <> template \<class T> friend class A<int>::B; 10979Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10980 MultiTemplateParamsArg TempParams) { 10981 SourceLocation Loc = DS.getLocStart(); 10982 10983 assert(DS.isFriendSpecified()); 10984 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10985 10986 // Try to convert the decl specifier to a type. This works for 10987 // friend templates because ActOnTag never produces a ClassTemplateDecl 10988 // for a TUK_Friend. 10989 Declarator TheDeclarator(DS, Declarator::MemberContext); 10990 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10991 QualType T = TSI->getType(); 10992 if (TheDeclarator.isInvalidType()) 10993 return 0; 10994 10995 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10996 return 0; 10997 10998 // This is definitely an error in C++98. It's probably meant to 10999 // be forbidden in C++0x, too, but the specification is just 11000 // poorly written. 11001 // 11002 // The problem is with declarations like the following: 11003 // template <T> friend A<T>::foo; 11004 // where deciding whether a class C is a friend or not now hinges 11005 // on whether there exists an instantiation of A that causes 11006 // 'foo' to equal C. There are restrictions on class-heads 11007 // (which we declare (by fiat) elaborated friend declarations to 11008 // be) that makes this tractable. 11009 // 11010 // FIXME: handle "template <> friend class A<T>;", which 11011 // is possibly well-formed? Who even knows? 11012 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 11013 Diag(Loc, diag::err_tagless_friend_type_template) 11014 << DS.getSourceRange(); 11015 return 0; 11016 } 11017 11018 // C++98 [class.friend]p1: A friend of a class is a function 11019 // or class that is not a member of the class . . . 11020 // This is fixed in DR77, which just barely didn't make the C++03 11021 // deadline. It's also a very silly restriction that seriously 11022 // affects inner classes and which nobody else seems to implement; 11023 // thus we never diagnose it, not even in -pedantic. 11024 // 11025 // But note that we could warn about it: it's always useless to 11026 // friend one of your own members (it's not, however, worthless to 11027 // friend a member of an arbitrary specialization of your template). 11028 11029 Decl *D; 11030 if (unsigned NumTempParamLists = TempParams.size()) 11031 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 11032 NumTempParamLists, 11033 TempParams.data(), 11034 TSI, 11035 DS.getFriendSpecLoc()); 11036 else 11037 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 11038 11039 if (!D) 11040 return 0; 11041 11042 D->setAccess(AS_public); 11043 CurContext->addDecl(D); 11044 11045 return D; 11046} 11047 11048NamedDecl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 11049 MultiTemplateParamsArg TemplateParams) { 11050 const DeclSpec &DS = D.getDeclSpec(); 11051 11052 assert(DS.isFriendSpecified()); 11053 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 11054 11055 SourceLocation Loc = D.getIdentifierLoc(); 11056 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 11057 11058 // C++ [class.friend]p1 11059 // A friend of a class is a function or class.... 11060 // Note that this sees through typedefs, which is intended. 11061 // It *doesn't* see through dependent types, which is correct 11062 // according to [temp.arg.type]p3: 11063 // If a declaration acquires a function type through a 11064 // type dependent on a template-parameter and this causes 11065 // a declaration that does not use the syntactic form of a 11066 // function declarator to have a function type, the program 11067 // is ill-formed. 11068 if (!TInfo->getType()->isFunctionType()) { 11069 Diag(Loc, diag::err_unexpected_friend); 11070 11071 // It might be worthwhile to try to recover by creating an 11072 // appropriate declaration. 11073 return 0; 11074 } 11075 11076 // C++ [namespace.memdef]p3 11077 // - If a friend declaration in a non-local class first declares a 11078 // class or function, the friend class or function is a member 11079 // of the innermost enclosing namespace. 11080 // - The name of the friend is not found by simple name lookup 11081 // until a matching declaration is provided in that namespace 11082 // scope (either before or after the class declaration granting 11083 // friendship). 11084 // - If a friend function is called, its name may be found by the 11085 // name lookup that considers functions from namespaces and 11086 // classes associated with the types of the function arguments. 11087 // - When looking for a prior declaration of a class or a function 11088 // declared as a friend, scopes outside the innermost enclosing 11089 // namespace scope are not considered. 11090 11091 CXXScopeSpec &SS = D.getCXXScopeSpec(); 11092 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 11093 DeclarationName Name = NameInfo.getName(); 11094 assert(Name); 11095 11096 // Check for unexpanded parameter packs. 11097 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 11098 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 11099 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 11100 return 0; 11101 11102 // The context we found the declaration in, or in which we should 11103 // create the declaration. 11104 DeclContext *DC; 11105 Scope *DCScope = S; 11106 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 11107 ForRedeclaration); 11108 11109 // FIXME: there are different rules in local classes 11110 11111 // There are four cases here. 11112 // - There's no scope specifier, in which case we just go to the 11113 // appropriate scope and look for a function or function template 11114 // there as appropriate. 11115 // Recover from invalid scope qualifiers as if they just weren't there. 11116 if (SS.isInvalid() || !SS.isSet()) { 11117 // C++0x [namespace.memdef]p3: 11118 // If the name in a friend declaration is neither qualified nor 11119 // a template-id and the declaration is a function or an 11120 // elaborated-type-specifier, the lookup to determine whether 11121 // the entity has been previously declared shall not consider 11122 // any scopes outside the innermost enclosing namespace. 11123 // C++0x [class.friend]p11: 11124 // If a friend declaration appears in a local class and the name 11125 // specified is an unqualified name, a prior declaration is 11126 // looked up without considering scopes that are outside the 11127 // innermost enclosing non-class scope. For a friend function 11128 // declaration, if there is no prior declaration, the program is 11129 // ill-formed. 11130 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 11131 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 11132 11133 // Find the appropriate context according to the above. 11134 DC = CurContext; 11135 11136 // Skip class contexts. If someone can cite chapter and verse 11137 // for this behavior, that would be nice --- it's what GCC and 11138 // EDG do, and it seems like a reasonable intent, but the spec 11139 // really only says that checks for unqualified existing 11140 // declarations should stop at the nearest enclosing namespace, 11141 // not that they should only consider the nearest enclosing 11142 // namespace. 11143 while (DC->isRecord()) 11144 DC = DC->getParent(); 11145 11146 DeclContext *LookupDC = DC; 11147 while (LookupDC->isTransparentContext()) 11148 LookupDC = LookupDC->getParent(); 11149 11150 while (true) { 11151 LookupQualifiedName(Previous, LookupDC); 11152 11153 // TODO: decide what we think about using declarations. 11154 if (isLocal) 11155 break; 11156 11157 if (!Previous.empty()) { 11158 DC = LookupDC; 11159 break; 11160 } 11161 11162 if (isTemplateId) { 11163 if (isa<TranslationUnitDecl>(LookupDC)) break; 11164 } else { 11165 if (LookupDC->isFileContext()) break; 11166 } 11167 LookupDC = LookupDC->getParent(); 11168 } 11169 11170 DCScope = getScopeForDeclContext(S, DC); 11171 11172 // C++ [class.friend]p6: 11173 // A function can be defined in a friend declaration of a class if and 11174 // only if the class is a non-local class (9.8), the function name is 11175 // unqualified, and the function has namespace scope. 11176 if (isLocal && D.isFunctionDefinition()) { 11177 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 11178 } 11179 11180 // - There's a non-dependent scope specifier, in which case we 11181 // compute it and do a previous lookup there for a function 11182 // or function template. 11183 } else if (!SS.getScopeRep()->isDependent()) { 11184 DC = computeDeclContext(SS); 11185 if (!DC) return 0; 11186 11187 if (RequireCompleteDeclContext(SS, DC)) return 0; 11188 11189 LookupQualifiedName(Previous, DC); 11190 11191 // Ignore things found implicitly in the wrong scope. 11192 // TODO: better diagnostics for this case. Suggesting the right 11193 // qualified scope would be nice... 11194 LookupResult::Filter F = Previous.makeFilter(); 11195 while (F.hasNext()) { 11196 NamedDecl *D = F.next(); 11197 if (!DC->InEnclosingNamespaceSetOf( 11198 D->getDeclContext()->getRedeclContext())) 11199 F.erase(); 11200 } 11201 F.done(); 11202 11203 if (Previous.empty()) { 11204 D.setInvalidType(); 11205 Diag(Loc, diag::err_qualified_friend_not_found) 11206 << Name << TInfo->getType(); 11207 return 0; 11208 } 11209 11210 // C++ [class.friend]p1: A friend of a class is a function or 11211 // class that is not a member of the class . . . 11212 if (DC->Equals(CurContext)) 11213 Diag(DS.getFriendSpecLoc(), 11214 getLangOpts().CPlusPlus11 ? 11215 diag::warn_cxx98_compat_friend_is_member : 11216 diag::err_friend_is_member); 11217 11218 if (D.isFunctionDefinition()) { 11219 // C++ [class.friend]p6: 11220 // A function can be defined in a friend declaration of a class if and 11221 // only if the class is a non-local class (9.8), the function name is 11222 // unqualified, and the function has namespace scope. 11223 SemaDiagnosticBuilder DB 11224 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 11225 11226 DB << SS.getScopeRep(); 11227 if (DC->isFileContext()) 11228 DB << FixItHint::CreateRemoval(SS.getRange()); 11229 SS.clear(); 11230 } 11231 11232 // - There's a scope specifier that does not match any template 11233 // parameter lists, in which case we use some arbitrary context, 11234 // create a method or method template, and wait for instantiation. 11235 // - There's a scope specifier that does match some template 11236 // parameter lists, which we don't handle right now. 11237 } else { 11238 if (D.isFunctionDefinition()) { 11239 // C++ [class.friend]p6: 11240 // A function can be defined in a friend declaration of a class if and 11241 // only if the class is a non-local class (9.8), the function name is 11242 // unqualified, and the function has namespace scope. 11243 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 11244 << SS.getScopeRep(); 11245 } 11246 11247 DC = CurContext; 11248 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 11249 } 11250 11251 if (!DC->isRecord()) { 11252 // This implies that it has to be an operator or function. 11253 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 11254 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 11255 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 11256 Diag(Loc, diag::err_introducing_special_friend) << 11257 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 11258 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 11259 return 0; 11260 } 11261 } 11262 11263 // FIXME: This is an egregious hack to cope with cases where the scope stack 11264 // does not contain the declaration context, i.e., in an out-of-line 11265 // definition of a class. 11266 Scope FakeDCScope(S, Scope::DeclScope, Diags); 11267 if (!DCScope) { 11268 FakeDCScope.setEntity(DC); 11269 DCScope = &FakeDCScope; 11270 } 11271 11272 bool AddToScope = true; 11273 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 11274 TemplateParams, AddToScope); 11275 if (!ND) return 0; 11276 11277 assert(ND->getDeclContext() == DC); 11278 assert(ND->getLexicalDeclContext() == CurContext); 11279 11280 // Add the function declaration to the appropriate lookup tables, 11281 // adjusting the redeclarations list as necessary. We don't 11282 // want to do this yet if the friending class is dependent. 11283 // 11284 // Also update the scope-based lookup if the target context's 11285 // lookup context is in lexical scope. 11286 if (!CurContext->isDependentContext()) { 11287 DC = DC->getRedeclContext(); 11288 DC->makeDeclVisibleInContext(ND); 11289 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 11290 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 11291 } 11292 11293 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 11294 D.getIdentifierLoc(), ND, 11295 DS.getFriendSpecLoc()); 11296 FrD->setAccess(AS_public); 11297 CurContext->addDecl(FrD); 11298 11299 if (ND->isInvalidDecl()) { 11300 FrD->setInvalidDecl(); 11301 } else { 11302 if (DC->isRecord()) CheckFriendAccess(ND); 11303 11304 FunctionDecl *FD; 11305 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 11306 FD = FTD->getTemplatedDecl(); 11307 else 11308 FD = cast<FunctionDecl>(ND); 11309 11310 // Mark templated-scope function declarations as unsupported. 11311 if (FD->getNumTemplateParameterLists()) 11312 FrD->setUnsupportedFriend(true); 11313 } 11314 11315 return ND; 11316} 11317 11318void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 11319 AdjustDeclIfTemplate(Dcl); 11320 11321 FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(Dcl); 11322 if (!Fn) { 11323 Diag(DelLoc, diag::err_deleted_non_function); 11324 return; 11325 } 11326 11327 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 11328 // Don't consider the implicit declaration we generate for explicit 11329 // specializations. FIXME: Do not generate these implicit declarations. 11330 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 11331 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 11332 Diag(DelLoc, diag::err_deleted_decl_not_first); 11333 Diag(Prev->getLocation(), diag::note_previous_declaration); 11334 } 11335 // If the declaration wasn't the first, we delete the function anyway for 11336 // recovery. 11337 Fn = Fn->getCanonicalDecl(); 11338 } 11339 11340 if (Fn->isDeleted()) 11341 return; 11342 11343 // See if we're deleting a function which is already known to override a 11344 // non-deleted virtual function. 11345 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Fn)) { 11346 bool IssuedDiagnostic = false; 11347 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 11348 E = MD->end_overridden_methods(); 11349 I != E; ++I) { 11350 if (!(*MD->begin_overridden_methods())->isDeleted()) { 11351 if (!IssuedDiagnostic) { 11352 Diag(DelLoc, diag::err_deleted_override) << MD->getDeclName(); 11353 IssuedDiagnostic = true; 11354 } 11355 Diag((*I)->getLocation(), diag::note_overridden_virtual_function); 11356 } 11357 } 11358 } 11359 11360 Fn->setDeletedAsWritten(); 11361} 11362 11363void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 11364 CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Dcl); 11365 11366 if (MD) { 11367 if (MD->getParent()->isDependentType()) { 11368 MD->setDefaulted(); 11369 MD->setExplicitlyDefaulted(); 11370 return; 11371 } 11372 11373 CXXSpecialMember Member = getSpecialMember(MD); 11374 if (Member == CXXInvalid) { 11375 Diag(DefaultLoc, diag::err_default_special_members); 11376 return; 11377 } 11378 11379 MD->setDefaulted(); 11380 MD->setExplicitlyDefaulted(); 11381 11382 // If this definition appears within the record, do the checking when 11383 // the record is complete. 11384 const FunctionDecl *Primary = MD; 11385 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern()) 11386 // Find the uninstantiated declaration that actually had the '= default' 11387 // on it. 11388 Pattern->isDefined(Primary); 11389 11390 // If the method was defaulted on its first declaration, we will have 11391 // already performed the checking in CheckCompletedCXXClass. Such a 11392 // declaration doesn't trigger an implicit definition. 11393 if (Primary == Primary->getCanonicalDecl()) 11394 return; 11395 11396 CheckExplicitlyDefaultedSpecialMember(MD); 11397 11398 // The exception specification is needed because we are defining the 11399 // function. 11400 ResolveExceptionSpec(DefaultLoc, 11401 MD->getType()->castAs<FunctionProtoType>()); 11402 11403 switch (Member) { 11404 case CXXDefaultConstructor: { 11405 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 11406 if (!CD->isInvalidDecl()) 11407 DefineImplicitDefaultConstructor(DefaultLoc, CD); 11408 break; 11409 } 11410 11411 case CXXCopyConstructor: { 11412 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 11413 if (!CD->isInvalidDecl()) 11414 DefineImplicitCopyConstructor(DefaultLoc, CD); 11415 break; 11416 } 11417 11418 case CXXCopyAssignment: { 11419 if (!MD->isInvalidDecl()) 11420 DefineImplicitCopyAssignment(DefaultLoc, MD); 11421 break; 11422 } 11423 11424 case CXXDestructor: { 11425 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 11426 if (!DD->isInvalidDecl()) 11427 DefineImplicitDestructor(DefaultLoc, DD); 11428 break; 11429 } 11430 11431 case CXXMoveConstructor: { 11432 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 11433 if (!CD->isInvalidDecl()) 11434 DefineImplicitMoveConstructor(DefaultLoc, CD); 11435 break; 11436 } 11437 11438 case CXXMoveAssignment: { 11439 if (!MD->isInvalidDecl()) 11440 DefineImplicitMoveAssignment(DefaultLoc, MD); 11441 break; 11442 } 11443 11444 case CXXInvalid: 11445 llvm_unreachable("Invalid special member."); 11446 } 11447 } else { 11448 Diag(DefaultLoc, diag::err_default_special_members); 11449 } 11450} 11451 11452static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 11453 for (Stmt::child_range CI = S->children(); CI; ++CI) { 11454 Stmt *SubStmt = *CI; 11455 if (!SubStmt) 11456 continue; 11457 if (isa<ReturnStmt>(SubStmt)) 11458 Self.Diag(SubStmt->getLocStart(), 11459 diag::err_return_in_constructor_handler); 11460 if (!isa<Expr>(SubStmt)) 11461 SearchForReturnInStmt(Self, SubStmt); 11462 } 11463} 11464 11465void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 11466 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 11467 CXXCatchStmt *Handler = TryBlock->getHandler(I); 11468 SearchForReturnInStmt(*this, Handler); 11469 } 11470} 11471 11472bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 11473 const CXXMethodDecl *Old) { 11474 const FunctionType *NewFT = New->getType()->getAs<FunctionType>(); 11475 const FunctionType *OldFT = Old->getType()->getAs<FunctionType>(); 11476 11477 CallingConv NewCC = NewFT->getCallConv(), OldCC = OldFT->getCallConv(); 11478 11479 // If the calling conventions match, everything is fine 11480 if (NewCC == OldCC) 11481 return false; 11482 11483 // If either of the calling conventions are set to "default", we need to pick 11484 // something more sensible based on the target. This supports code where the 11485 // one method explicitly sets thiscall, and another has no explicit calling 11486 // convention. 11487 CallingConv Default = 11488 Context.getTargetInfo().getDefaultCallingConv(TargetInfo::CCMT_Member); 11489 if (NewCC == CC_Default) 11490 NewCC = Default; 11491 if (OldCC == CC_Default) 11492 OldCC = Default; 11493 11494 // If the calling conventions still don't match, then report the error 11495 if (NewCC != OldCC) { 11496 Diag(New->getLocation(), 11497 diag::err_conflicting_overriding_cc_attributes) 11498 << New->getDeclName() << New->getType() << Old->getType(); 11499 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11500 return true; 11501 } 11502 11503 return false; 11504} 11505 11506bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 11507 const CXXMethodDecl *Old) { 11508 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 11509 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 11510 11511 if (Context.hasSameType(NewTy, OldTy) || 11512 NewTy->isDependentType() || OldTy->isDependentType()) 11513 return false; 11514 11515 // Check if the return types are covariant 11516 QualType NewClassTy, OldClassTy; 11517 11518 /// Both types must be pointers or references to classes. 11519 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 11520 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 11521 NewClassTy = NewPT->getPointeeType(); 11522 OldClassTy = OldPT->getPointeeType(); 11523 } 11524 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 11525 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 11526 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 11527 NewClassTy = NewRT->getPointeeType(); 11528 OldClassTy = OldRT->getPointeeType(); 11529 } 11530 } 11531 } 11532 11533 // The return types aren't either both pointers or references to a class type. 11534 if (NewClassTy.isNull()) { 11535 Diag(New->getLocation(), 11536 diag::err_different_return_type_for_overriding_virtual_function) 11537 << New->getDeclName() << NewTy << OldTy; 11538 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11539 11540 return true; 11541 } 11542 11543 // C++ [class.virtual]p6: 11544 // If the return type of D::f differs from the return type of B::f, the 11545 // class type in the return type of D::f shall be complete at the point of 11546 // declaration of D::f or shall be the class type D. 11547 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 11548 if (!RT->isBeingDefined() && 11549 RequireCompleteType(New->getLocation(), NewClassTy, 11550 diag::err_covariant_return_incomplete, 11551 New->getDeclName())) 11552 return true; 11553 } 11554 11555 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 11556 // Check if the new class derives from the old class. 11557 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 11558 Diag(New->getLocation(), 11559 diag::err_covariant_return_not_derived) 11560 << New->getDeclName() << NewTy << OldTy; 11561 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11562 return true; 11563 } 11564 11565 // Check if we the conversion from derived to base is valid. 11566 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 11567 diag::err_covariant_return_inaccessible_base, 11568 diag::err_covariant_return_ambiguous_derived_to_base_conv, 11569 // FIXME: Should this point to the return type? 11570 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 11571 // FIXME: this note won't trigger for delayed access control 11572 // diagnostics, and it's impossible to get an undelayed error 11573 // here from access control during the original parse because 11574 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 11575 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11576 return true; 11577 } 11578 } 11579 11580 // The qualifiers of the return types must be the same. 11581 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 11582 Diag(New->getLocation(), 11583 diag::err_covariant_return_type_different_qualifications) 11584 << New->getDeclName() << NewTy << OldTy; 11585 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11586 return true; 11587 }; 11588 11589 11590 // The new class type must have the same or less qualifiers as the old type. 11591 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 11592 Diag(New->getLocation(), 11593 diag::err_covariant_return_type_class_type_more_qualified) 11594 << New->getDeclName() << NewTy << OldTy; 11595 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11596 return true; 11597 }; 11598 11599 return false; 11600} 11601 11602/// \brief Mark the given method pure. 11603/// 11604/// \param Method the method to be marked pure. 11605/// 11606/// \param InitRange the source range that covers the "0" initializer. 11607bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 11608 SourceLocation EndLoc = InitRange.getEnd(); 11609 if (EndLoc.isValid()) 11610 Method->setRangeEnd(EndLoc); 11611 11612 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 11613 Method->setPure(); 11614 return false; 11615 } 11616 11617 if (!Method->isInvalidDecl()) 11618 Diag(Method->getLocation(), diag::err_non_virtual_pure) 11619 << Method->getDeclName() << InitRange; 11620 return true; 11621} 11622 11623/// \brief Determine whether the given declaration is a static data member. 11624static bool isStaticDataMember(Decl *D) { 11625 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 11626 if (!Var) 11627 return false; 11628 11629 return Var->isStaticDataMember(); 11630} 11631/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 11632/// an initializer for the out-of-line declaration 'Dcl'. The scope 11633/// is a fresh scope pushed for just this purpose. 11634/// 11635/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 11636/// static data member of class X, names should be looked up in the scope of 11637/// class X. 11638void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 11639 // If there is no declaration, there was an error parsing it. 11640 if (D == 0 || D->isInvalidDecl()) return; 11641 11642 // We should only get called for declarations with scope specifiers, like: 11643 // int foo::bar; 11644 assert(D->isOutOfLine()); 11645 EnterDeclaratorContext(S, D->getDeclContext()); 11646 11647 // If we are parsing the initializer for a static data member, push a 11648 // new expression evaluation context that is associated with this static 11649 // data member. 11650 if (isStaticDataMember(D)) 11651 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 11652} 11653 11654/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 11655/// initializer for the out-of-line declaration 'D'. 11656void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 11657 // If there is no declaration, there was an error parsing it. 11658 if (D == 0 || D->isInvalidDecl()) return; 11659 11660 if (isStaticDataMember(D)) 11661 PopExpressionEvaluationContext(); 11662 11663 assert(D->isOutOfLine()); 11664 ExitDeclaratorContext(S); 11665} 11666 11667/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 11668/// C++ if/switch/while/for statement. 11669/// e.g: "if (int x = f()) {...}" 11670DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 11671 // C++ 6.4p2: 11672 // The declarator shall not specify a function or an array. 11673 // The type-specifier-seq shall not contain typedef and shall not declare a 11674 // new class or enumeration. 11675 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 11676 "Parser allowed 'typedef' as storage class of condition decl."); 11677 11678 Decl *Dcl = ActOnDeclarator(S, D); 11679 if (!Dcl) 11680 return true; 11681 11682 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 11683 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 11684 << D.getSourceRange(); 11685 return true; 11686 } 11687 11688 return Dcl; 11689} 11690 11691void Sema::LoadExternalVTableUses() { 11692 if (!ExternalSource) 11693 return; 11694 11695 SmallVector<ExternalVTableUse, 4> VTables; 11696 ExternalSource->ReadUsedVTables(VTables); 11697 SmallVector<VTableUse, 4> NewUses; 11698 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 11699 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 11700 = VTablesUsed.find(VTables[I].Record); 11701 // Even if a definition wasn't required before, it may be required now. 11702 if (Pos != VTablesUsed.end()) { 11703 if (!Pos->second && VTables[I].DefinitionRequired) 11704 Pos->second = true; 11705 continue; 11706 } 11707 11708 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 11709 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 11710 } 11711 11712 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 11713} 11714 11715void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 11716 bool DefinitionRequired) { 11717 // Ignore any vtable uses in unevaluated operands or for classes that do 11718 // not have a vtable. 11719 if (!Class->isDynamicClass() || Class->isDependentContext() || 11720 CurContext->isDependentContext() || 11721 ExprEvalContexts.back().Context == Unevaluated) 11722 return; 11723 11724 // Try to insert this class into the map. 11725 LoadExternalVTableUses(); 11726 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 11727 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 11728 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 11729 if (!Pos.second) { 11730 // If we already had an entry, check to see if we are promoting this vtable 11731 // to required a definition. If so, we need to reappend to the VTableUses 11732 // list, since we may have already processed the first entry. 11733 if (DefinitionRequired && !Pos.first->second) { 11734 Pos.first->second = true; 11735 } else { 11736 // Otherwise, we can early exit. 11737 return; 11738 } 11739 } 11740 11741 // Local classes need to have their virtual members marked 11742 // immediately. For all other classes, we mark their virtual members 11743 // at the end of the translation unit. 11744 if (Class->isLocalClass()) 11745 MarkVirtualMembersReferenced(Loc, Class); 11746 else 11747 VTableUses.push_back(std::make_pair(Class, Loc)); 11748} 11749 11750bool Sema::DefineUsedVTables() { 11751 LoadExternalVTableUses(); 11752 if (VTableUses.empty()) 11753 return false; 11754 11755 // Note: The VTableUses vector could grow as a result of marking 11756 // the members of a class as "used", so we check the size each 11757 // time through the loop and prefer indices (which are stable) to 11758 // iterators (which are not). 11759 bool DefinedAnything = false; 11760 for (unsigned I = 0; I != VTableUses.size(); ++I) { 11761 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 11762 if (!Class) 11763 continue; 11764 11765 SourceLocation Loc = VTableUses[I].second; 11766 11767 bool DefineVTable = true; 11768 11769 // If this class has a key function, but that key function is 11770 // defined in another translation unit, we don't need to emit the 11771 // vtable even though we're using it. 11772 const CXXMethodDecl *KeyFunction = Context.getCurrentKeyFunction(Class); 11773 if (KeyFunction && !KeyFunction->hasBody()) { 11774 switch (KeyFunction->getTemplateSpecializationKind()) { 11775 case TSK_Undeclared: 11776 case TSK_ExplicitSpecialization: 11777 case TSK_ExplicitInstantiationDeclaration: 11778 // The key function is in another translation unit. 11779 DefineVTable = false; 11780 break; 11781 11782 case TSK_ExplicitInstantiationDefinition: 11783 case TSK_ImplicitInstantiation: 11784 // We will be instantiating the key function. 11785 break; 11786 } 11787 } else if (!KeyFunction) { 11788 // If we have a class with no key function that is the subject 11789 // of an explicit instantiation declaration, suppress the 11790 // vtable; it will live with the explicit instantiation 11791 // definition. 11792 bool IsExplicitInstantiationDeclaration 11793 = Class->getTemplateSpecializationKind() 11794 == TSK_ExplicitInstantiationDeclaration; 11795 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 11796 REnd = Class->redecls_end(); 11797 R != REnd; ++R) { 11798 TemplateSpecializationKind TSK 11799 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 11800 if (TSK == TSK_ExplicitInstantiationDeclaration) 11801 IsExplicitInstantiationDeclaration = true; 11802 else if (TSK == TSK_ExplicitInstantiationDefinition) { 11803 IsExplicitInstantiationDeclaration = false; 11804 break; 11805 } 11806 } 11807 11808 if (IsExplicitInstantiationDeclaration) 11809 DefineVTable = false; 11810 } 11811 11812 // The exception specifications for all virtual members may be needed even 11813 // if we are not providing an authoritative form of the vtable in this TU. 11814 // We may choose to emit it available_externally anyway. 11815 if (!DefineVTable) { 11816 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 11817 continue; 11818 } 11819 11820 // Mark all of the virtual members of this class as referenced, so 11821 // that we can build a vtable. Then, tell the AST consumer that a 11822 // vtable for this class is required. 11823 DefinedAnything = true; 11824 MarkVirtualMembersReferenced(Loc, Class); 11825 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 11826 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 11827 11828 // Optionally warn if we're emitting a weak vtable. 11829 if (Class->hasExternalLinkage() && 11830 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 11831 const FunctionDecl *KeyFunctionDef = 0; 11832 if (!KeyFunction || 11833 (KeyFunction->hasBody(KeyFunctionDef) && 11834 KeyFunctionDef->isInlined())) 11835 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 11836 TSK_ExplicitInstantiationDefinition 11837 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 11838 << Class; 11839 } 11840 } 11841 VTableUses.clear(); 11842 11843 return DefinedAnything; 11844} 11845 11846void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 11847 const CXXRecordDecl *RD) { 11848 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 11849 E = RD->method_end(); I != E; ++I) 11850 if ((*I)->isVirtual() && !(*I)->isPure()) 11851 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 11852} 11853 11854void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 11855 const CXXRecordDecl *RD) { 11856 // Mark all functions which will appear in RD's vtable as used. 11857 CXXFinalOverriderMap FinalOverriders; 11858 RD->getFinalOverriders(FinalOverriders); 11859 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 11860 E = FinalOverriders.end(); 11861 I != E; ++I) { 11862 for (OverridingMethods::const_iterator OI = I->second.begin(), 11863 OE = I->second.end(); 11864 OI != OE; ++OI) { 11865 assert(OI->second.size() > 0 && "no final overrider"); 11866 CXXMethodDecl *Overrider = OI->second.front().Method; 11867 11868 // C++ [basic.def.odr]p2: 11869 // [...] A virtual member function is used if it is not pure. [...] 11870 if (!Overrider->isPure()) 11871 MarkFunctionReferenced(Loc, Overrider); 11872 } 11873 } 11874 11875 // Only classes that have virtual bases need a VTT. 11876 if (RD->getNumVBases() == 0) 11877 return; 11878 11879 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 11880 e = RD->bases_end(); i != e; ++i) { 11881 const CXXRecordDecl *Base = 11882 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 11883 if (Base->getNumVBases() == 0) 11884 continue; 11885 MarkVirtualMembersReferenced(Loc, Base); 11886 } 11887} 11888 11889/// SetIvarInitializers - This routine builds initialization ASTs for the 11890/// Objective-C implementation whose ivars need be initialized. 11891void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 11892 if (!getLangOpts().CPlusPlus) 11893 return; 11894 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 11895 SmallVector<ObjCIvarDecl*, 8> ivars; 11896 CollectIvarsToConstructOrDestruct(OID, ivars); 11897 if (ivars.empty()) 11898 return; 11899 SmallVector<CXXCtorInitializer*, 32> AllToInit; 11900 for (unsigned i = 0; i < ivars.size(); i++) { 11901 FieldDecl *Field = ivars[i]; 11902 if (Field->isInvalidDecl()) 11903 continue; 11904 11905 CXXCtorInitializer *Member; 11906 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 11907 InitializationKind InitKind = 11908 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 11909 11910 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 11911 ExprResult MemberInit = 11912 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 11913 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 11914 // Note, MemberInit could actually come back empty if no initialization 11915 // is required (e.g., because it would call a trivial default constructor) 11916 if (!MemberInit.get() || MemberInit.isInvalid()) 11917 continue; 11918 11919 Member = 11920 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 11921 SourceLocation(), 11922 MemberInit.takeAs<Expr>(), 11923 SourceLocation()); 11924 AllToInit.push_back(Member); 11925 11926 // Be sure that the destructor is accessible and is marked as referenced. 11927 if (const RecordType *RecordTy 11928 = Context.getBaseElementType(Field->getType()) 11929 ->getAs<RecordType>()) { 11930 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 11931 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 11932 MarkFunctionReferenced(Field->getLocation(), Destructor); 11933 CheckDestructorAccess(Field->getLocation(), Destructor, 11934 PDiag(diag::err_access_dtor_ivar) 11935 << Context.getBaseElementType(Field->getType())); 11936 } 11937 } 11938 } 11939 ObjCImplementation->setIvarInitializers(Context, 11940 AllToInit.data(), AllToInit.size()); 11941 } 11942} 11943 11944static 11945void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 11946 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 11947 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 11948 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 11949 Sema &S) { 11950 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11951 CE = Current.end(); 11952 if (Ctor->isInvalidDecl()) 11953 return; 11954 11955 CXXConstructorDecl *Target = Ctor->getTargetConstructor(); 11956 11957 // Target may not be determinable yet, for instance if this is a dependent 11958 // call in an uninstantiated template. 11959 if (Target) { 11960 const FunctionDecl *FNTarget = 0; 11961 (void)Target->hasBody(FNTarget); 11962 Target = const_cast<CXXConstructorDecl*>( 11963 cast_or_null<CXXConstructorDecl>(FNTarget)); 11964 } 11965 11966 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 11967 // Avoid dereferencing a null pointer here. 11968 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 11969 11970 if (!Current.insert(Canonical)) 11971 return; 11972 11973 // We know that beyond here, we aren't chaining into a cycle. 11974 if (!Target || !Target->isDelegatingConstructor() || 11975 Target->isInvalidDecl() || Valid.count(TCanonical)) { 11976 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11977 Valid.insert(*CI); 11978 Current.clear(); 11979 // We've hit a cycle. 11980 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 11981 Current.count(TCanonical)) { 11982 // If we haven't diagnosed this cycle yet, do so now. 11983 if (!Invalid.count(TCanonical)) { 11984 S.Diag((*Ctor->init_begin())->getSourceLocation(), 11985 diag::warn_delegating_ctor_cycle) 11986 << Ctor; 11987 11988 // Don't add a note for a function delegating directly to itself. 11989 if (TCanonical != Canonical) 11990 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11991 11992 CXXConstructorDecl *C = Target; 11993 while (C->getCanonicalDecl() != Canonical) { 11994 const FunctionDecl *FNTarget = 0; 11995 (void)C->getTargetConstructor()->hasBody(FNTarget); 11996 assert(FNTarget && "Ctor cycle through bodiless function"); 11997 11998 C = const_cast<CXXConstructorDecl*>( 11999 cast<CXXConstructorDecl>(FNTarget)); 12000 S.Diag(C->getLocation(), diag::note_which_delegates_to); 12001 } 12002 } 12003 12004 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 12005 Invalid.insert(*CI); 12006 Current.clear(); 12007 } else { 12008 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 12009 } 12010} 12011 12012 12013void Sema::CheckDelegatingCtorCycles() { 12014 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 12015 12016 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 12017 CE = Current.end(); 12018 12019 for (DelegatingCtorDeclsType::iterator 12020 I = DelegatingCtorDecls.begin(ExternalSource), 12021 E = DelegatingCtorDecls.end(); 12022 I != E; ++I) 12023 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 12024 12025 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 12026 (*CI)->setInvalidDecl(); 12027} 12028 12029namespace { 12030 /// \brief AST visitor that finds references to the 'this' expression. 12031 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 12032 Sema &S; 12033 12034 public: 12035 explicit FindCXXThisExpr(Sema &S) : S(S) { } 12036 12037 bool VisitCXXThisExpr(CXXThisExpr *E) { 12038 S.Diag(E->getLocation(), diag::err_this_static_member_func) 12039 << E->isImplicit(); 12040 return false; 12041 } 12042 }; 12043} 12044 12045bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 12046 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 12047 if (!TSInfo) 12048 return false; 12049 12050 TypeLoc TL = TSInfo->getTypeLoc(); 12051 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); 12052 if (!ProtoTL) 12053 return false; 12054 12055 // C++11 [expr.prim.general]p3: 12056 // [The expression this] shall not appear before the optional 12057 // cv-qualifier-seq and it shall not appear within the declaration of a 12058 // static member function (although its type and value category are defined 12059 // within a static member function as they are within a non-static member 12060 // function). [ Note: this is because declaration matching does not occur 12061 // until the complete declarator is known. - end note ] 12062 const FunctionProtoType *Proto = ProtoTL.getTypePtr(); 12063 FindCXXThisExpr Finder(*this); 12064 12065 // If the return type came after the cv-qualifier-seq, check it now. 12066 if (Proto->hasTrailingReturn() && 12067 !Finder.TraverseTypeLoc(ProtoTL.getResultLoc())) 12068 return true; 12069 12070 // Check the exception specification. 12071 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 12072 return true; 12073 12074 return checkThisInStaticMemberFunctionAttributes(Method); 12075} 12076 12077bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 12078 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 12079 if (!TSInfo) 12080 return false; 12081 12082 TypeLoc TL = TSInfo->getTypeLoc(); 12083 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); 12084 if (!ProtoTL) 12085 return false; 12086 12087 const FunctionProtoType *Proto = ProtoTL.getTypePtr(); 12088 FindCXXThisExpr Finder(*this); 12089 12090 switch (Proto->getExceptionSpecType()) { 12091 case EST_Uninstantiated: 12092 case EST_Unevaluated: 12093 case EST_BasicNoexcept: 12094 case EST_DynamicNone: 12095 case EST_MSAny: 12096 case EST_None: 12097 break; 12098 12099 case EST_ComputedNoexcept: 12100 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 12101 return true; 12102 12103 case EST_Dynamic: 12104 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 12105 EEnd = Proto->exception_end(); 12106 E != EEnd; ++E) { 12107 if (!Finder.TraverseType(*E)) 12108 return true; 12109 } 12110 break; 12111 } 12112 12113 return false; 12114} 12115 12116bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 12117 FindCXXThisExpr Finder(*this); 12118 12119 // Check attributes. 12120 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 12121 A != AEnd; ++A) { 12122 // FIXME: This should be emitted by tblgen. 12123 Expr *Arg = 0; 12124 ArrayRef<Expr *> Args; 12125 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 12126 Arg = G->getArg(); 12127 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 12128 Arg = G->getArg(); 12129 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 12130 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 12131 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 12132 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 12133 else if (ExclusiveLockFunctionAttr *ELF 12134 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 12135 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 12136 else if (SharedLockFunctionAttr *SLF 12137 = dyn_cast<SharedLockFunctionAttr>(*A)) 12138 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 12139 else if (ExclusiveTrylockFunctionAttr *ETLF 12140 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 12141 Arg = ETLF->getSuccessValue(); 12142 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 12143 } else if (SharedTrylockFunctionAttr *STLF 12144 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 12145 Arg = STLF->getSuccessValue(); 12146 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 12147 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 12148 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 12149 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 12150 Arg = LR->getArg(); 12151 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 12152 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 12153 else if (ExclusiveLocksRequiredAttr *ELR 12154 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 12155 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 12156 else if (SharedLocksRequiredAttr *SLR 12157 = dyn_cast<SharedLocksRequiredAttr>(*A)) 12158 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 12159 12160 if (Arg && !Finder.TraverseStmt(Arg)) 12161 return true; 12162 12163 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 12164 if (!Finder.TraverseStmt(Args[I])) 12165 return true; 12166 } 12167 } 12168 12169 return false; 12170} 12171 12172void 12173Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 12174 ArrayRef<ParsedType> DynamicExceptions, 12175 ArrayRef<SourceRange> DynamicExceptionRanges, 12176 Expr *NoexceptExpr, 12177 SmallVectorImpl<QualType> &Exceptions, 12178 FunctionProtoType::ExtProtoInfo &EPI) { 12179 Exceptions.clear(); 12180 EPI.ExceptionSpecType = EST; 12181 if (EST == EST_Dynamic) { 12182 Exceptions.reserve(DynamicExceptions.size()); 12183 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 12184 // FIXME: Preserve type source info. 12185 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 12186 12187 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 12188 collectUnexpandedParameterPacks(ET, Unexpanded); 12189 if (!Unexpanded.empty()) { 12190 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 12191 UPPC_ExceptionType, 12192 Unexpanded); 12193 continue; 12194 } 12195 12196 // Check that the type is valid for an exception spec, and 12197 // drop it if not. 12198 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 12199 Exceptions.push_back(ET); 12200 } 12201 EPI.NumExceptions = Exceptions.size(); 12202 EPI.Exceptions = Exceptions.data(); 12203 return; 12204 } 12205 12206 if (EST == EST_ComputedNoexcept) { 12207 // If an error occurred, there's no expression here. 12208 if (NoexceptExpr) { 12209 assert((NoexceptExpr->isTypeDependent() || 12210 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 12211 Context.BoolTy) && 12212 "Parser should have made sure that the expression is boolean"); 12213 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 12214 EPI.ExceptionSpecType = EST_BasicNoexcept; 12215 return; 12216 } 12217 12218 if (!NoexceptExpr->isValueDependent()) 12219 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 12220 diag::err_noexcept_needs_constant_expression, 12221 /*AllowFold*/ false).take(); 12222 EPI.NoexceptExpr = NoexceptExpr; 12223 } 12224 return; 12225 } 12226} 12227 12228/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 12229Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 12230 // Implicitly declared functions (e.g. copy constructors) are 12231 // __host__ __device__ 12232 if (D->isImplicit()) 12233 return CFT_HostDevice; 12234 12235 if (D->hasAttr<CUDAGlobalAttr>()) 12236 return CFT_Global; 12237 12238 if (D->hasAttr<CUDADeviceAttr>()) { 12239 if (D->hasAttr<CUDAHostAttr>()) 12240 return CFT_HostDevice; 12241 else 12242 return CFT_Device; 12243 } 12244 12245 return CFT_Host; 12246} 12247 12248bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 12249 CUDAFunctionTarget CalleeTarget) { 12250 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 12251 // Callable from the device only." 12252 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 12253 return true; 12254 12255 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 12256 // Callable from the host only." 12257 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 12258 // Callable from the host only." 12259 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 12260 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 12261 return true; 12262 12263 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 12264 return true; 12265 12266 return false; 12267} 12268 12269/// HandleMSProperty - Analyze a __delcspec(property) field of a C++ class. 12270/// 12271MSPropertyDecl *Sema::HandleMSProperty(Scope *S, RecordDecl *Record, 12272 SourceLocation DeclStart, 12273 Declarator &D, Expr *BitWidth, 12274 InClassInitStyle InitStyle, 12275 AccessSpecifier AS, 12276 AttributeList *MSPropertyAttr) { 12277 IdentifierInfo *II = D.getIdentifier(); 12278 if (!II) { 12279 Diag(DeclStart, diag::err_anonymous_property); 12280 return NULL; 12281 } 12282 SourceLocation Loc = D.getIdentifierLoc(); 12283 12284 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 12285 QualType T = TInfo->getType(); 12286 if (getLangOpts().CPlusPlus) { 12287 CheckExtraCXXDefaultArguments(D); 12288 12289 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 12290 UPPC_DataMemberType)) { 12291 D.setInvalidType(); 12292 T = Context.IntTy; 12293 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 12294 } 12295 } 12296 12297 DiagnoseFunctionSpecifiers(D.getDeclSpec()); 12298 12299 if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec()) 12300 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(), 12301 diag::err_invalid_thread) 12302 << DeclSpec::getSpecifierName(TSCS); 12303 12304 // Check to see if this name was declared as a member previously 12305 NamedDecl *PrevDecl = 0; 12306 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 12307 LookupName(Previous, S); 12308 switch (Previous.getResultKind()) { 12309 case LookupResult::Found: 12310 case LookupResult::FoundUnresolvedValue: 12311 PrevDecl = Previous.getAsSingle<NamedDecl>(); 12312 break; 12313 12314 case LookupResult::FoundOverloaded: 12315 PrevDecl = Previous.getRepresentativeDecl(); 12316 break; 12317 12318 case LookupResult::NotFound: 12319 case LookupResult::NotFoundInCurrentInstantiation: 12320 case LookupResult::Ambiguous: 12321 break; 12322 } 12323 12324 if (PrevDecl && PrevDecl->isTemplateParameter()) { 12325 // Maybe we will complain about the shadowed template parameter. 12326 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 12327 // Just pretend that we didn't see the previous declaration. 12328 PrevDecl = 0; 12329 } 12330 12331 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 12332 PrevDecl = 0; 12333 12334 SourceLocation TSSL = D.getLocStart(); 12335 MSPropertyDecl *NewPD; 12336 const AttributeList::PropertyData &Data = MSPropertyAttr->getPropertyData(); 12337 NewPD = new (Context) MSPropertyDecl(Record, Loc, 12338 II, T, TInfo, TSSL, 12339 Data.GetterId, Data.SetterId); 12340 ProcessDeclAttributes(TUScope, NewPD, D); 12341 NewPD->setAccess(AS); 12342 12343 if (NewPD->isInvalidDecl()) 12344 Record->setInvalidDecl(); 12345 12346 if (D.getDeclSpec().isModulePrivateSpecified()) 12347 NewPD->setModulePrivate(); 12348 12349 if (NewPD->isInvalidDecl() && PrevDecl) { 12350 // Don't introduce NewFD into scope; there's already something 12351 // with the same name in the same scope. 12352 } else if (II) { 12353 PushOnScopeChains(NewPD, S); 12354 } else 12355 Record->addDecl(NewPD); 12356 12357 return NewPD; 12358} 12359