SemaDeclCXX.cpp revision 0b0ca4724d1c05dc0dd1d6e5aff4c8a439cbb1a2
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 bool IsLambda = FD->getOverloadedOperator() == OO_Call && 637 isa<CXXMethodDecl>(FD) && 638 cast<CXXMethodDecl>(FD)->getParent()->isLambda(); 639 640 // Find first parameter with a default argument 641 for (p = 0; p < NumParams; ++p) { 642 ParmVarDecl *Param = FD->getParamDecl(p); 643 if (Param->hasDefaultArg()) { 644 // C++11 [expr.prim.lambda]p5: 645 // [...] Default arguments (8.3.6) shall not be specified in the 646 // parameter-declaration-clause of a lambda-declarator. 647 // 648 // FIXME: Core issue 974 strikes this sentence, we only provide an 649 // extension warning. 650 if (IsLambda) 651 Diag(Param->getLocation(), diag::ext_lambda_default_arguments) 652 << Param->getDefaultArgRange(); 653 break; 654 } 655 } 656 657 // C++ [dcl.fct.default]p4: 658 // In a given function declaration, all parameters 659 // subsequent to a parameter with a default argument shall 660 // have default arguments supplied in this or previous 661 // declarations. A default argument shall not be redefined 662 // by a later declaration (not even to the same value). 663 unsigned LastMissingDefaultArg = 0; 664 for (; p < NumParams; ++p) { 665 ParmVarDecl *Param = FD->getParamDecl(p); 666 if (!Param->hasDefaultArg()) { 667 if (Param->isInvalidDecl()) 668 /* We already complained about this parameter. */; 669 else if (Param->getIdentifier()) 670 Diag(Param->getLocation(), 671 diag::err_param_default_argument_missing_name) 672 << Param->getIdentifier(); 673 else 674 Diag(Param->getLocation(), 675 diag::err_param_default_argument_missing); 676 677 LastMissingDefaultArg = p; 678 } 679 } 680 681 if (LastMissingDefaultArg > 0) { 682 // Some default arguments were missing. Clear out all of the 683 // default arguments up to (and including) the last missing 684 // default argument, so that we leave the function parameters 685 // in a semantically valid state. 686 for (p = 0; p <= LastMissingDefaultArg; ++p) { 687 ParmVarDecl *Param = FD->getParamDecl(p); 688 if (Param->hasDefaultArg()) { 689 Param->setDefaultArg(0); 690 } 691 } 692 } 693} 694 695// CheckConstexprParameterTypes - Check whether a function's parameter types 696// are all literal types. If so, return true. If not, produce a suitable 697// diagnostic and return false. 698static bool CheckConstexprParameterTypes(Sema &SemaRef, 699 const FunctionDecl *FD) { 700 unsigned ArgIndex = 0; 701 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 702 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 703 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 704 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 705 SourceLocation ParamLoc = PD->getLocation(); 706 if (!(*i)->isDependentType() && 707 SemaRef.RequireLiteralType(ParamLoc, *i, 708 diag::err_constexpr_non_literal_param, 709 ArgIndex+1, PD->getSourceRange(), 710 isa<CXXConstructorDecl>(FD))) 711 return false; 712 } 713 return true; 714} 715 716/// \brief Get diagnostic %select index for tag kind for 717/// record diagnostic message. 718/// WARNING: Indexes apply to particular diagnostics only! 719/// 720/// \returns diagnostic %select index. 721static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) { 722 switch (Tag) { 723 case TTK_Struct: return 0; 724 case TTK_Interface: return 1; 725 case TTK_Class: return 2; 726 default: llvm_unreachable("Invalid tag kind for record diagnostic!"); 727 } 728} 729 730// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 731// the requirements of a constexpr function definition or a constexpr 732// constructor definition. If so, return true. If not, produce appropriate 733// diagnostics and return false. 734// 735// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 736bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 737 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 738 if (MD && MD->isInstance()) { 739 // C++11 [dcl.constexpr]p4: 740 // The definition of a constexpr constructor shall satisfy the following 741 // constraints: 742 // - the class shall not have any virtual base classes; 743 const CXXRecordDecl *RD = MD->getParent(); 744 if (RD->getNumVBases()) { 745 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 746 << isa<CXXConstructorDecl>(NewFD) 747 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 748 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 749 E = RD->vbases_end(); I != E; ++I) 750 Diag(I->getLocStart(), 751 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 752 return false; 753 } 754 } 755 756 if (!isa<CXXConstructorDecl>(NewFD)) { 757 // C++11 [dcl.constexpr]p3: 758 // The definition of a constexpr function shall satisfy the following 759 // constraints: 760 // - it shall not be virtual; 761 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 762 if (Method && Method->isVirtual()) { 763 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 764 765 // If it's not obvious why this function is virtual, find an overridden 766 // function which uses the 'virtual' keyword. 767 const CXXMethodDecl *WrittenVirtual = Method; 768 while (!WrittenVirtual->isVirtualAsWritten()) 769 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 770 if (WrittenVirtual != Method) 771 Diag(WrittenVirtual->getLocation(), 772 diag::note_overridden_virtual_function); 773 return false; 774 } 775 776 // - its return type shall be a literal type; 777 QualType RT = NewFD->getResultType(); 778 if (!RT->isDependentType() && 779 RequireLiteralType(NewFD->getLocation(), RT, 780 diag::err_constexpr_non_literal_return)) 781 return false; 782 } 783 784 // - each of its parameter types shall be a literal type; 785 if (!CheckConstexprParameterTypes(*this, NewFD)) 786 return false; 787 788 return true; 789} 790 791/// Check the given declaration statement is legal within a constexpr function 792/// body. C++0x [dcl.constexpr]p3,p4. 793/// 794/// \return true if the body is OK, false if we have diagnosed a problem. 795static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 796 DeclStmt *DS) { 797 // C++0x [dcl.constexpr]p3 and p4: 798 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 799 // contain only 800 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 801 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 802 switch ((*DclIt)->getKind()) { 803 case Decl::StaticAssert: 804 case Decl::Using: 805 case Decl::UsingShadow: 806 case Decl::UsingDirective: 807 case Decl::UnresolvedUsingTypename: 808 // - static_assert-declarations 809 // - using-declarations, 810 // - using-directives, 811 continue; 812 813 case Decl::Typedef: 814 case Decl::TypeAlias: { 815 // - typedef declarations and alias-declarations that do not define 816 // classes or enumerations, 817 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 818 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 819 // Don't allow variably-modified types in constexpr functions. 820 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 821 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 822 << TL.getSourceRange() << TL.getType() 823 << isa<CXXConstructorDecl>(Dcl); 824 return false; 825 } 826 continue; 827 } 828 829 case Decl::Enum: 830 case Decl::CXXRecord: 831 // As an extension, we allow the declaration (but not the definition) of 832 // classes and enumerations in all declarations, not just in typedef and 833 // alias declarations. 834 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 835 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 836 << isa<CXXConstructorDecl>(Dcl); 837 return false; 838 } 839 continue; 840 841 case Decl::Var: 842 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 843 << isa<CXXConstructorDecl>(Dcl); 844 return false; 845 846 default: 847 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 848 << isa<CXXConstructorDecl>(Dcl); 849 return false; 850 } 851 } 852 853 return true; 854} 855 856/// Check that the given field is initialized within a constexpr constructor. 857/// 858/// \param Dcl The constexpr constructor being checked. 859/// \param Field The field being checked. This may be a member of an anonymous 860/// struct or union nested within the class being checked. 861/// \param Inits All declarations, including anonymous struct/union members and 862/// indirect members, for which any initialization was provided. 863/// \param Diagnosed Set to true if an error is produced. 864static void CheckConstexprCtorInitializer(Sema &SemaRef, 865 const FunctionDecl *Dcl, 866 FieldDecl *Field, 867 llvm::SmallSet<Decl*, 16> &Inits, 868 bool &Diagnosed) { 869 if (Field->isUnnamedBitfield()) 870 return; 871 872 if (Field->isAnonymousStructOrUnion() && 873 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 874 return; 875 876 if (!Inits.count(Field)) { 877 if (!Diagnosed) { 878 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 879 Diagnosed = true; 880 } 881 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 882 } else if (Field->isAnonymousStructOrUnion()) { 883 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 884 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 885 I != E; ++I) 886 // If an anonymous union contains an anonymous struct of which any member 887 // is initialized, all members must be initialized. 888 if (!RD->isUnion() || Inits.count(*I)) 889 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 890 } 891} 892 893/// Check the body for the given constexpr function declaration only contains 894/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 895/// 896/// \return true if the body is OK, false if we have diagnosed a problem. 897bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 898 if (isa<CXXTryStmt>(Body)) { 899 // C++11 [dcl.constexpr]p3: 900 // The definition of a constexpr function shall satisfy the following 901 // constraints: [...] 902 // - its function-body shall be = delete, = default, or a 903 // compound-statement 904 // 905 // C++11 [dcl.constexpr]p4: 906 // In the definition of a constexpr constructor, [...] 907 // - its function-body shall not be a function-try-block; 908 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 909 << isa<CXXConstructorDecl>(Dcl); 910 return false; 911 } 912 913 // - its function-body shall be [...] a compound-statement that contains only 914 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 915 916 SmallVector<SourceLocation, 4> ReturnStmts; 917 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 918 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 919 switch ((*BodyIt)->getStmtClass()) { 920 case Stmt::NullStmtClass: 921 // - null statements, 922 continue; 923 924 case Stmt::DeclStmtClass: 925 // - static_assert-declarations 926 // - using-declarations, 927 // - using-directives, 928 // - typedef declarations and alias-declarations that do not define 929 // classes or enumerations, 930 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 931 return false; 932 continue; 933 934 case Stmt::ReturnStmtClass: 935 // - and exactly one return statement; 936 if (isa<CXXConstructorDecl>(Dcl)) 937 break; 938 939 ReturnStmts.push_back((*BodyIt)->getLocStart()); 940 continue; 941 942 default: 943 break; 944 } 945 946 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 947 << isa<CXXConstructorDecl>(Dcl); 948 return false; 949 } 950 951 if (const CXXConstructorDecl *Constructor 952 = dyn_cast<CXXConstructorDecl>(Dcl)) { 953 const CXXRecordDecl *RD = Constructor->getParent(); 954 // DR1359: 955 // - every non-variant non-static data member and base class sub-object 956 // shall be initialized; 957 // - if the class is a non-empty union, or for each non-empty anonymous 958 // union member of a non-union class, exactly one non-static data member 959 // shall be initialized; 960 if (RD->isUnion()) { 961 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 962 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 963 return false; 964 } 965 } else if (!Constructor->isDependentContext() && 966 !Constructor->isDelegatingConstructor()) { 967 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 968 969 // Skip detailed checking if we have enough initializers, and we would 970 // allow at most one initializer per member. 971 bool AnyAnonStructUnionMembers = false; 972 unsigned Fields = 0; 973 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 974 E = RD->field_end(); I != E; ++I, ++Fields) { 975 if (I->isAnonymousStructOrUnion()) { 976 AnyAnonStructUnionMembers = true; 977 break; 978 } 979 } 980 if (AnyAnonStructUnionMembers || 981 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 982 // Check initialization of non-static data members. Base classes are 983 // always initialized so do not need to be checked. Dependent bases 984 // might not have initializers in the member initializer list. 985 llvm::SmallSet<Decl*, 16> Inits; 986 for (CXXConstructorDecl::init_const_iterator 987 I = Constructor->init_begin(), E = Constructor->init_end(); 988 I != E; ++I) { 989 if (FieldDecl *FD = (*I)->getMember()) 990 Inits.insert(FD); 991 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 992 Inits.insert(ID->chain_begin(), ID->chain_end()); 993 } 994 995 bool Diagnosed = false; 996 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 997 E = RD->field_end(); I != E; ++I) 998 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 999 if (Diagnosed) 1000 return false; 1001 } 1002 } 1003 } else { 1004 if (ReturnStmts.empty()) { 1005 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 1006 return false; 1007 } 1008 if (ReturnStmts.size() > 1) { 1009 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 1010 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 1011 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 1012 return false; 1013 } 1014 } 1015 1016 // C++11 [dcl.constexpr]p5: 1017 // if no function argument values exist such that the function invocation 1018 // substitution would produce a constant expression, the program is 1019 // ill-formed; no diagnostic required. 1020 // C++11 [dcl.constexpr]p3: 1021 // - every constructor call and implicit conversion used in initializing the 1022 // return value shall be one of those allowed in a constant expression. 1023 // C++11 [dcl.constexpr]p4: 1024 // - every constructor involved in initializing non-static data members and 1025 // base class sub-objects shall be a constexpr constructor. 1026 SmallVector<PartialDiagnosticAt, 8> Diags; 1027 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 1028 Diag(Dcl->getLocation(), diag::ext_constexpr_function_never_constant_expr) 1029 << isa<CXXConstructorDecl>(Dcl); 1030 for (size_t I = 0, N = Diags.size(); I != N; ++I) 1031 Diag(Diags[I].first, Diags[I].second); 1032 // Don't return false here: we allow this for compatibility in 1033 // system headers. 1034 } 1035 1036 return true; 1037} 1038 1039/// isCurrentClassName - Determine whether the identifier II is the 1040/// name of the class type currently being defined. In the case of 1041/// nested classes, this will only return true if II is the name of 1042/// the innermost class. 1043bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 1044 const CXXScopeSpec *SS) { 1045 assert(getLangOpts().CPlusPlus && "No class names in C!"); 1046 1047 CXXRecordDecl *CurDecl; 1048 if (SS && SS->isSet() && !SS->isInvalid()) { 1049 DeclContext *DC = computeDeclContext(*SS, true); 1050 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 1051 } else 1052 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1053 1054 if (CurDecl && CurDecl->getIdentifier()) 1055 return &II == CurDecl->getIdentifier(); 1056 else 1057 return false; 1058} 1059 1060/// \brief Determine whether the given class is a base class of the given 1061/// class, including looking at dependent bases. 1062static bool findCircularInheritance(const CXXRecordDecl *Class, 1063 const CXXRecordDecl *Current) { 1064 SmallVector<const CXXRecordDecl*, 8> Queue; 1065 1066 Class = Class->getCanonicalDecl(); 1067 while (true) { 1068 for (CXXRecordDecl::base_class_const_iterator I = Current->bases_begin(), 1069 E = Current->bases_end(); 1070 I != E; ++I) { 1071 CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); 1072 if (!Base) 1073 continue; 1074 1075 Base = Base->getDefinition(); 1076 if (!Base) 1077 continue; 1078 1079 if (Base->getCanonicalDecl() == Class) 1080 return true; 1081 1082 Queue.push_back(Base); 1083 } 1084 1085 if (Queue.empty()) 1086 return false; 1087 1088 Current = Queue.back(); 1089 Queue.pop_back(); 1090 } 1091 1092 return false; 1093} 1094 1095/// \brief Check the validity of a C++ base class specifier. 1096/// 1097/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1098/// and returns NULL otherwise. 1099CXXBaseSpecifier * 1100Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1101 SourceRange SpecifierRange, 1102 bool Virtual, AccessSpecifier Access, 1103 TypeSourceInfo *TInfo, 1104 SourceLocation EllipsisLoc) { 1105 QualType BaseType = TInfo->getType(); 1106 1107 // C++ [class.union]p1: 1108 // A union shall not have base classes. 1109 if (Class->isUnion()) { 1110 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1111 << SpecifierRange; 1112 return 0; 1113 } 1114 1115 if (EllipsisLoc.isValid() && 1116 !TInfo->getType()->containsUnexpandedParameterPack()) { 1117 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1118 << TInfo->getTypeLoc().getSourceRange(); 1119 EllipsisLoc = SourceLocation(); 1120 } 1121 1122 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1123 1124 if (BaseType->isDependentType()) { 1125 // Make sure that we don't have circular inheritance among our dependent 1126 // bases. For non-dependent bases, the check for completeness below handles 1127 // this. 1128 if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) { 1129 if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() || 1130 ((BaseDecl = BaseDecl->getDefinition()) && 1131 findCircularInheritance(Class, BaseDecl))) { 1132 Diag(BaseLoc, diag::err_circular_inheritance) 1133 << BaseType << Context.getTypeDeclType(Class); 1134 1135 if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl()) 1136 Diag(BaseDecl->getLocation(), diag::note_previous_decl) 1137 << BaseType; 1138 1139 return 0; 1140 } 1141 } 1142 1143 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1144 Class->getTagKind() == TTK_Class, 1145 Access, TInfo, EllipsisLoc); 1146 } 1147 1148 // Base specifiers must be record types. 1149 if (!BaseType->isRecordType()) { 1150 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1151 return 0; 1152 } 1153 1154 // C++ [class.union]p1: 1155 // A union shall not be used as a base class. 1156 if (BaseType->isUnionType()) { 1157 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1158 return 0; 1159 } 1160 1161 // C++ [class.derived]p2: 1162 // The class-name in a base-specifier shall not be an incompletely 1163 // defined class. 1164 if (RequireCompleteType(BaseLoc, BaseType, 1165 diag::err_incomplete_base_class, SpecifierRange)) { 1166 Class->setInvalidDecl(); 1167 return 0; 1168 } 1169 1170 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1171 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1172 assert(BaseDecl && "Record type has no declaration"); 1173 BaseDecl = BaseDecl->getDefinition(); 1174 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1175 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1176 assert(CXXBaseDecl && "Base type is not a C++ type"); 1177 1178 // C++ [class]p3: 1179 // If a class is marked final and it appears as a base-type-specifier in 1180 // base-clause, the program is ill-formed. 1181 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1182 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1183 << CXXBaseDecl->getDeclName(); 1184 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1185 << CXXBaseDecl->getDeclName(); 1186 return 0; 1187 } 1188 1189 if (BaseDecl->isInvalidDecl()) 1190 Class->setInvalidDecl(); 1191 1192 // Create the base specifier. 1193 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1194 Class->getTagKind() == TTK_Class, 1195 Access, TInfo, EllipsisLoc); 1196} 1197 1198/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1199/// one entry in the base class list of a class specifier, for 1200/// example: 1201/// class foo : public bar, virtual private baz { 1202/// 'public bar' and 'virtual private baz' are each base-specifiers. 1203BaseResult 1204Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1205 ParsedAttributes &Attributes, 1206 bool Virtual, AccessSpecifier Access, 1207 ParsedType basetype, SourceLocation BaseLoc, 1208 SourceLocation EllipsisLoc) { 1209 if (!classdecl) 1210 return true; 1211 1212 AdjustDeclIfTemplate(classdecl); 1213 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1214 if (!Class) 1215 return true; 1216 1217 // We do not support any C++11 attributes on base-specifiers yet. 1218 // Diagnose any attributes we see. 1219 if (!Attributes.empty()) { 1220 for (AttributeList *Attr = Attributes.getList(); Attr; 1221 Attr = Attr->getNext()) { 1222 if (Attr->isInvalid() || 1223 Attr->getKind() == AttributeList::IgnoredAttribute) 1224 continue; 1225 Diag(Attr->getLoc(), 1226 Attr->getKind() == AttributeList::UnknownAttribute 1227 ? diag::warn_unknown_attribute_ignored 1228 : diag::err_base_specifier_attribute) 1229 << Attr->getName(); 1230 } 1231 } 1232 1233 TypeSourceInfo *TInfo = 0; 1234 GetTypeFromParser(basetype, &TInfo); 1235 1236 if (EllipsisLoc.isInvalid() && 1237 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1238 UPPC_BaseType)) 1239 return true; 1240 1241 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1242 Virtual, Access, TInfo, 1243 EllipsisLoc)) 1244 return BaseSpec; 1245 else 1246 Class->setInvalidDecl(); 1247 1248 return true; 1249} 1250 1251/// \brief Performs the actual work of attaching the given base class 1252/// specifiers to a C++ class. 1253bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1254 unsigned NumBases) { 1255 if (NumBases == 0) 1256 return false; 1257 1258 // Used to keep track of which base types we have already seen, so 1259 // that we can properly diagnose redundant direct base types. Note 1260 // that the key is always the unqualified canonical type of the base 1261 // class. 1262 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1263 1264 // Copy non-redundant base specifiers into permanent storage. 1265 unsigned NumGoodBases = 0; 1266 bool Invalid = false; 1267 for (unsigned idx = 0; idx < NumBases; ++idx) { 1268 QualType NewBaseType 1269 = Context.getCanonicalType(Bases[idx]->getType()); 1270 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1271 1272 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1273 if (KnownBase) { 1274 // C++ [class.mi]p3: 1275 // A class shall not be specified as a direct base class of a 1276 // derived class more than once. 1277 Diag(Bases[idx]->getLocStart(), 1278 diag::err_duplicate_base_class) 1279 << KnownBase->getType() 1280 << Bases[idx]->getSourceRange(); 1281 1282 // Delete the duplicate base class specifier; we're going to 1283 // overwrite its pointer later. 1284 Context.Deallocate(Bases[idx]); 1285 1286 Invalid = true; 1287 } else { 1288 // Okay, add this new base class. 1289 KnownBase = Bases[idx]; 1290 Bases[NumGoodBases++] = Bases[idx]; 1291 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) { 1292 const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); 1293 if (Class->isInterface() && 1294 (!RD->isInterface() || 1295 KnownBase->getAccessSpecifier() != AS_public)) { 1296 // The Microsoft extension __interface does not permit bases that 1297 // are not themselves public interfaces. 1298 Diag(KnownBase->getLocStart(), diag::err_invalid_base_in_interface) 1299 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getName() 1300 << RD->getSourceRange(); 1301 Invalid = true; 1302 } 1303 if (RD->hasAttr<WeakAttr>()) 1304 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1305 } 1306 } 1307 } 1308 1309 // Attach the remaining base class specifiers to the derived class. 1310 Class->setBases(Bases, NumGoodBases); 1311 1312 // Delete the remaining (good) base class specifiers, since their 1313 // data has been copied into the CXXRecordDecl. 1314 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1315 Context.Deallocate(Bases[idx]); 1316 1317 return Invalid; 1318} 1319 1320/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1321/// class, after checking whether there are any duplicate base 1322/// classes. 1323void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1324 unsigned NumBases) { 1325 if (!ClassDecl || !Bases || !NumBases) 1326 return; 1327 1328 AdjustDeclIfTemplate(ClassDecl); 1329 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1330 (CXXBaseSpecifier**)(Bases), NumBases); 1331} 1332 1333/// \brief Determine whether the type \p Derived is a C++ class that is 1334/// derived from the type \p Base. 1335bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1336 if (!getLangOpts().CPlusPlus) 1337 return false; 1338 1339 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); 1340 if (!DerivedRD) 1341 return false; 1342 1343 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); 1344 if (!BaseRD) 1345 return false; 1346 1347 // If either the base or the derived type is invalid, don't try to 1348 // check whether one is derived from the other. 1349 if (BaseRD->isInvalidDecl() || DerivedRD->isInvalidDecl()) 1350 return false; 1351 1352 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1353 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1354} 1355 1356/// \brief Determine whether the type \p Derived is a C++ class that is 1357/// derived from the type \p Base. 1358bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1359 if (!getLangOpts().CPlusPlus) 1360 return false; 1361 1362 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); 1363 if (!DerivedRD) 1364 return false; 1365 1366 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); 1367 if (!BaseRD) 1368 return false; 1369 1370 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1371} 1372 1373void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1374 CXXCastPath &BasePathArray) { 1375 assert(BasePathArray.empty() && "Base path array must be empty!"); 1376 assert(Paths.isRecordingPaths() && "Must record paths!"); 1377 1378 const CXXBasePath &Path = Paths.front(); 1379 1380 // We first go backward and check if we have a virtual base. 1381 // FIXME: It would be better if CXXBasePath had the base specifier for 1382 // the nearest virtual base. 1383 unsigned Start = 0; 1384 for (unsigned I = Path.size(); I != 0; --I) { 1385 if (Path[I - 1].Base->isVirtual()) { 1386 Start = I - 1; 1387 break; 1388 } 1389 } 1390 1391 // Now add all bases. 1392 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1393 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1394} 1395 1396/// \brief Determine whether the given base path includes a virtual 1397/// base class. 1398bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1399 for (CXXCastPath::const_iterator B = BasePath.begin(), 1400 BEnd = BasePath.end(); 1401 B != BEnd; ++B) 1402 if ((*B)->isVirtual()) 1403 return true; 1404 1405 return false; 1406} 1407 1408/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1409/// conversion (where Derived and Base are class types) is 1410/// well-formed, meaning that the conversion is unambiguous (and 1411/// that all of the base classes are accessible). Returns true 1412/// and emits a diagnostic if the code is ill-formed, returns false 1413/// otherwise. Loc is the location where this routine should point to 1414/// if there is an error, and Range is the source range to highlight 1415/// if there is an error. 1416bool 1417Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1418 unsigned InaccessibleBaseID, 1419 unsigned AmbigiousBaseConvID, 1420 SourceLocation Loc, SourceRange Range, 1421 DeclarationName Name, 1422 CXXCastPath *BasePath) { 1423 // First, determine whether the path from Derived to Base is 1424 // ambiguous. This is slightly more expensive than checking whether 1425 // the Derived to Base conversion exists, because here we need to 1426 // explore multiple paths to determine if there is an ambiguity. 1427 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1428 /*DetectVirtual=*/false); 1429 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1430 assert(DerivationOkay && 1431 "Can only be used with a derived-to-base conversion"); 1432 (void)DerivationOkay; 1433 1434 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1435 if (InaccessibleBaseID) { 1436 // Check that the base class can be accessed. 1437 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1438 InaccessibleBaseID)) { 1439 case AR_inaccessible: 1440 return true; 1441 case AR_accessible: 1442 case AR_dependent: 1443 case AR_delayed: 1444 break; 1445 } 1446 } 1447 1448 // Build a base path if necessary. 1449 if (BasePath) 1450 BuildBasePathArray(Paths, *BasePath); 1451 return false; 1452 } 1453 1454 // We know that the derived-to-base conversion is ambiguous, and 1455 // we're going to produce a diagnostic. Perform the derived-to-base 1456 // search just one more time to compute all of the possible paths so 1457 // that we can print them out. This is more expensive than any of 1458 // the previous derived-to-base checks we've done, but at this point 1459 // performance isn't as much of an issue. 1460 Paths.clear(); 1461 Paths.setRecordingPaths(true); 1462 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1463 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1464 (void)StillOkay; 1465 1466 // Build up a textual representation of the ambiguous paths, e.g., 1467 // D -> B -> A, that will be used to illustrate the ambiguous 1468 // conversions in the diagnostic. We only print one of the paths 1469 // to each base class subobject. 1470 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1471 1472 Diag(Loc, AmbigiousBaseConvID) 1473 << Derived << Base << PathDisplayStr << Range << Name; 1474 return true; 1475} 1476 1477bool 1478Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1479 SourceLocation Loc, SourceRange Range, 1480 CXXCastPath *BasePath, 1481 bool IgnoreAccess) { 1482 return CheckDerivedToBaseConversion(Derived, Base, 1483 IgnoreAccess ? 0 1484 : diag::err_upcast_to_inaccessible_base, 1485 diag::err_ambiguous_derived_to_base_conv, 1486 Loc, Range, DeclarationName(), 1487 BasePath); 1488} 1489 1490 1491/// @brief Builds a string representing ambiguous paths from a 1492/// specific derived class to different subobjects of the same base 1493/// class. 1494/// 1495/// This function builds a string that can be used in error messages 1496/// to show the different paths that one can take through the 1497/// inheritance hierarchy to go from the derived class to different 1498/// subobjects of a base class. The result looks something like this: 1499/// @code 1500/// struct D -> struct B -> struct A 1501/// struct D -> struct C -> struct A 1502/// @endcode 1503std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1504 std::string PathDisplayStr; 1505 std::set<unsigned> DisplayedPaths; 1506 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1507 Path != Paths.end(); ++Path) { 1508 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1509 // We haven't displayed a path to this particular base 1510 // class subobject yet. 1511 PathDisplayStr += "\n "; 1512 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1513 for (CXXBasePath::const_iterator Element = Path->begin(); 1514 Element != Path->end(); ++Element) 1515 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1516 } 1517 } 1518 1519 return PathDisplayStr; 1520} 1521 1522//===----------------------------------------------------------------------===// 1523// C++ class member Handling 1524//===----------------------------------------------------------------------===// 1525 1526/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1527bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1528 SourceLocation ASLoc, 1529 SourceLocation ColonLoc, 1530 AttributeList *Attrs) { 1531 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1532 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1533 ASLoc, ColonLoc); 1534 CurContext->addHiddenDecl(ASDecl); 1535 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1536} 1537 1538/// CheckOverrideControl - Check C++11 override control semantics. 1539void Sema::CheckOverrideControl(Decl *D) { 1540 if (D->isInvalidDecl()) 1541 return; 1542 1543 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1544 1545 // Do we know which functions this declaration might be overriding? 1546 bool OverridesAreKnown = !MD || 1547 (!MD->getParent()->hasAnyDependentBases() && 1548 !MD->getType()->isDependentType()); 1549 1550 if (!MD || !MD->isVirtual()) { 1551 if (OverridesAreKnown) { 1552 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1553 Diag(OA->getLocation(), 1554 diag::override_keyword_only_allowed_on_virtual_member_functions) 1555 << "override" << FixItHint::CreateRemoval(OA->getLocation()); 1556 D->dropAttr<OverrideAttr>(); 1557 } 1558 if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1559 Diag(FA->getLocation(), 1560 diag::override_keyword_only_allowed_on_virtual_member_functions) 1561 << "final" << FixItHint::CreateRemoval(FA->getLocation()); 1562 D->dropAttr<FinalAttr>(); 1563 } 1564 } 1565 return; 1566 } 1567 1568 if (!OverridesAreKnown) 1569 return; 1570 1571 // C++11 [class.virtual]p5: 1572 // If a virtual function is marked with the virt-specifier override and 1573 // does not override a member function of a base class, the program is 1574 // ill-formed. 1575 bool HasOverriddenMethods = 1576 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1577 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) 1578 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) 1579 << MD->getDeclName(); 1580} 1581 1582/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1583/// function overrides a virtual member function marked 'final', according to 1584/// C++11 [class.virtual]p4. 1585bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1586 const CXXMethodDecl *Old) { 1587 if (!Old->hasAttr<FinalAttr>()) 1588 return false; 1589 1590 Diag(New->getLocation(), diag::err_final_function_overridden) 1591 << New->getDeclName(); 1592 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1593 return true; 1594} 1595 1596static bool InitializationHasSideEffects(const FieldDecl &FD) { 1597 const Type *T = FD.getType()->getBaseElementTypeUnsafe(); 1598 // FIXME: Destruction of ObjC lifetime types has side-effects. 1599 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) 1600 return !RD->isCompleteDefinition() || 1601 !RD->hasTrivialDefaultConstructor() || 1602 !RD->hasTrivialDestructor(); 1603 return false; 1604} 1605 1606/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1607/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1608/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1609/// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1610/// present (but parsing it has been deferred). 1611NamedDecl * 1612Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1613 MultiTemplateParamsArg TemplateParameterLists, 1614 Expr *BW, const VirtSpecifiers &VS, 1615 InClassInitStyle InitStyle) { 1616 const DeclSpec &DS = D.getDeclSpec(); 1617 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1618 DeclarationName Name = NameInfo.getName(); 1619 SourceLocation Loc = NameInfo.getLoc(); 1620 1621 // For anonymous bitfields, the location should point to the type. 1622 if (Loc.isInvalid()) 1623 Loc = D.getLocStart(); 1624 1625 Expr *BitWidth = static_cast<Expr*>(BW); 1626 1627 assert(isa<CXXRecordDecl>(CurContext)); 1628 assert(!DS.isFriendSpecified()); 1629 1630 bool isFunc = D.isDeclarationOfFunction(); 1631 1632 if (cast<CXXRecordDecl>(CurContext)->isInterface()) { 1633 // The Microsoft extension __interface only permits public member functions 1634 // and prohibits constructors, destructors, operators, non-public member 1635 // functions, static methods and data members. 1636 unsigned InvalidDecl; 1637 bool ShowDeclName = true; 1638 if (!isFunc) 1639 InvalidDecl = (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) ? 0 : 1; 1640 else if (AS != AS_public) 1641 InvalidDecl = 2; 1642 else if (DS.getStorageClassSpec() == DeclSpec::SCS_static) 1643 InvalidDecl = 3; 1644 else switch (Name.getNameKind()) { 1645 case DeclarationName::CXXConstructorName: 1646 InvalidDecl = 4; 1647 ShowDeclName = false; 1648 break; 1649 1650 case DeclarationName::CXXDestructorName: 1651 InvalidDecl = 5; 1652 ShowDeclName = false; 1653 break; 1654 1655 case DeclarationName::CXXOperatorName: 1656 case DeclarationName::CXXConversionFunctionName: 1657 InvalidDecl = 6; 1658 break; 1659 1660 default: 1661 InvalidDecl = 0; 1662 break; 1663 } 1664 1665 if (InvalidDecl) { 1666 if (ShowDeclName) 1667 Diag(Loc, diag::err_invalid_member_in_interface) 1668 << (InvalidDecl-1) << Name; 1669 else 1670 Diag(Loc, diag::err_invalid_member_in_interface) 1671 << (InvalidDecl-1) << ""; 1672 return 0; 1673 } 1674 } 1675 1676 // C++ 9.2p6: A member shall not be declared to have automatic storage 1677 // duration (auto, register) or with the extern storage-class-specifier. 1678 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1679 // data members and cannot be applied to names declared const or static, 1680 // and cannot be applied to reference members. 1681 switch (DS.getStorageClassSpec()) { 1682 case DeclSpec::SCS_unspecified: 1683 case DeclSpec::SCS_typedef: 1684 case DeclSpec::SCS_static: 1685 // FALL THROUGH. 1686 break; 1687 case DeclSpec::SCS_mutable: 1688 if (isFunc) { 1689 if (DS.getStorageClassSpecLoc().isValid()) 1690 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1691 else 1692 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1693 1694 // FIXME: It would be nicer if the keyword was ignored only for this 1695 // declarator. Otherwise we could get follow-up errors. 1696 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1697 } 1698 break; 1699 default: 1700 if (DS.getStorageClassSpecLoc().isValid()) 1701 Diag(DS.getStorageClassSpecLoc(), 1702 diag::err_storageclass_invalid_for_member); 1703 else 1704 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1705 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1706 } 1707 1708 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1709 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1710 !isFunc); 1711 1712 if (DS.isConstexprSpecified() && isInstField) { 1713 SemaDiagnosticBuilder B = 1714 Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr_member); 1715 SourceLocation ConstexprLoc = DS.getConstexprSpecLoc(); 1716 if (InitStyle == ICIS_NoInit) { 1717 B << 0 << 0 << FixItHint::CreateReplacement(ConstexprLoc, "const"); 1718 D.getMutableDeclSpec().ClearConstexprSpec(); 1719 const char *PrevSpec; 1720 unsigned DiagID; 1721 bool Failed = D.getMutableDeclSpec().SetTypeQual(DeclSpec::TQ_const, ConstexprLoc, 1722 PrevSpec, DiagID, getLangOpts()); 1723 (void)Failed; 1724 assert(!Failed && "Making a constexpr member const shouldn't fail"); 1725 } else { 1726 B << 1; 1727 const char *PrevSpec; 1728 unsigned DiagID; 1729 if (D.getMutableDeclSpec().SetStorageClassSpec( 1730 *this, DeclSpec::SCS_static, ConstexprLoc, PrevSpec, DiagID)) { 1731 assert(DS.getStorageClassSpec() == DeclSpec::SCS_mutable && 1732 "This is the only DeclSpec that should fail to be applied"); 1733 B << 1; 1734 } else { 1735 B << 0 << FixItHint::CreateInsertion(ConstexprLoc, "static "); 1736 isInstField = false; 1737 } 1738 } 1739 } 1740 1741 NamedDecl *Member; 1742 if (isInstField) { 1743 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1744 1745 // Data members must have identifiers for names. 1746 if (!Name.isIdentifier()) { 1747 Diag(Loc, diag::err_bad_variable_name) 1748 << Name; 1749 return 0; 1750 } 1751 1752 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1753 1754 // Member field could not be with "template" keyword. 1755 // So TemplateParameterLists should be empty in this case. 1756 if (TemplateParameterLists.size()) { 1757 TemplateParameterList* TemplateParams = TemplateParameterLists[0]; 1758 if (TemplateParams->size()) { 1759 // There is no such thing as a member field template. 1760 Diag(D.getIdentifierLoc(), diag::err_template_member) 1761 << II 1762 << SourceRange(TemplateParams->getTemplateLoc(), 1763 TemplateParams->getRAngleLoc()); 1764 } else { 1765 // There is an extraneous 'template<>' for this member. 1766 Diag(TemplateParams->getTemplateLoc(), 1767 diag::err_template_member_noparams) 1768 << II 1769 << SourceRange(TemplateParams->getTemplateLoc(), 1770 TemplateParams->getRAngleLoc()); 1771 } 1772 return 0; 1773 } 1774 1775 if (SS.isSet() && !SS.isInvalid()) { 1776 // The user provided a superfluous scope specifier inside a class 1777 // definition: 1778 // 1779 // class X { 1780 // int X::member; 1781 // }; 1782 if (DeclContext *DC = computeDeclContext(SS, false)) 1783 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1784 else 1785 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1786 << Name << SS.getRange(); 1787 1788 SS.clear(); 1789 } 1790 1791 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1792 InitStyle, AS); 1793 assert(Member && "HandleField never returns null"); 1794 } else { 1795 assert(InitStyle == ICIS_NoInit || D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static); 1796 1797 Member = HandleDeclarator(S, D, TemplateParameterLists); 1798 if (!Member) { 1799 return 0; 1800 } 1801 1802 // Non-instance-fields can't have a bitfield. 1803 if (BitWidth) { 1804 if (Member->isInvalidDecl()) { 1805 // don't emit another diagnostic. 1806 } else if (isa<VarDecl>(Member)) { 1807 // C++ 9.6p3: A bit-field shall not be a static member. 1808 // "static member 'A' cannot be a bit-field" 1809 Diag(Loc, diag::err_static_not_bitfield) 1810 << Name << BitWidth->getSourceRange(); 1811 } else if (isa<TypedefDecl>(Member)) { 1812 // "typedef member 'x' cannot be a bit-field" 1813 Diag(Loc, diag::err_typedef_not_bitfield) 1814 << Name << BitWidth->getSourceRange(); 1815 } else { 1816 // A function typedef ("typedef int f(); f a;"). 1817 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1818 Diag(Loc, diag::err_not_integral_type_bitfield) 1819 << Name << cast<ValueDecl>(Member)->getType() 1820 << BitWidth->getSourceRange(); 1821 } 1822 1823 BitWidth = 0; 1824 Member->setInvalidDecl(); 1825 } 1826 1827 Member->setAccess(AS); 1828 1829 // If we have declared a member function template, set the access of the 1830 // templated declaration as well. 1831 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1832 FunTmpl->getTemplatedDecl()->setAccess(AS); 1833 } 1834 1835 if (VS.isOverrideSpecified()) 1836 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1837 if (VS.isFinalSpecified()) 1838 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1839 1840 if (VS.getLastLocation().isValid()) { 1841 // Update the end location of a method that has a virt-specifiers. 1842 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1843 MD->setRangeEnd(VS.getLastLocation()); 1844 } 1845 1846 CheckOverrideControl(Member); 1847 1848 assert((Name || isInstField) && "No identifier for non-field ?"); 1849 1850 if (isInstField) { 1851 FieldDecl *FD = cast<FieldDecl>(Member); 1852 FieldCollector->Add(FD); 1853 1854 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 1855 FD->getLocation()) 1856 != DiagnosticsEngine::Ignored) { 1857 // Remember all explicit private FieldDecls that have a name, no side 1858 // effects and are not part of a dependent type declaration. 1859 if (!FD->isImplicit() && FD->getDeclName() && 1860 FD->getAccess() == AS_private && 1861 !FD->hasAttr<UnusedAttr>() && 1862 !FD->getParent()->isDependentContext() && 1863 !InitializationHasSideEffects(*FD)) 1864 UnusedPrivateFields.insert(FD); 1865 } 1866 } 1867 1868 return Member; 1869} 1870 1871namespace { 1872 class UninitializedFieldVisitor 1873 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 1874 Sema &S; 1875 ValueDecl *VD; 1876 public: 1877 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 1878 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context), 1879 S(S) { 1880 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(VD)) 1881 this->VD = IFD->getAnonField(); 1882 else 1883 this->VD = VD; 1884 } 1885 1886 void HandleExpr(Expr *E) { 1887 if (!E) return; 1888 1889 // Expressions like x(x) sometimes lack the surrounding expressions 1890 // but need to be checked anyways. 1891 HandleValue(E); 1892 Visit(E); 1893 } 1894 1895 void HandleValue(Expr *E) { 1896 E = E->IgnoreParens(); 1897 1898 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 1899 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 1900 return; 1901 1902 // FieldME is the inner-most MemberExpr that is not an anonymous struct 1903 // or union. 1904 MemberExpr *FieldME = ME; 1905 1906 Expr *Base = E; 1907 while (isa<MemberExpr>(Base)) { 1908 ME = cast<MemberExpr>(Base); 1909 1910 if (isa<VarDecl>(ME->getMemberDecl())) 1911 return; 1912 1913 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 1914 if (!FD->isAnonymousStructOrUnion()) 1915 FieldME = ME; 1916 1917 Base = ME->getBase(); 1918 } 1919 1920 if (VD == FieldME->getMemberDecl() && isa<CXXThisExpr>(Base)) { 1921 unsigned diag = VD->getType()->isReferenceType() 1922 ? diag::warn_reference_field_is_uninit 1923 : diag::warn_field_is_uninit; 1924 S.Diag(FieldME->getExprLoc(), diag) << VD; 1925 } 1926 return; 1927 } 1928 1929 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 1930 HandleValue(CO->getTrueExpr()); 1931 HandleValue(CO->getFalseExpr()); 1932 return; 1933 } 1934 1935 if (BinaryConditionalOperator *BCO = 1936 dyn_cast<BinaryConditionalOperator>(E)) { 1937 HandleValue(BCO->getCommon()); 1938 HandleValue(BCO->getFalseExpr()); 1939 return; 1940 } 1941 1942 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 1943 switch (BO->getOpcode()) { 1944 default: 1945 return; 1946 case(BO_PtrMemD): 1947 case(BO_PtrMemI): 1948 HandleValue(BO->getLHS()); 1949 return; 1950 case(BO_Comma): 1951 HandleValue(BO->getRHS()); 1952 return; 1953 } 1954 } 1955 } 1956 1957 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 1958 if (E->getCastKind() == CK_LValueToRValue) 1959 HandleValue(E->getSubExpr()); 1960 1961 Inherited::VisitImplicitCastExpr(E); 1962 } 1963 1964 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 1965 Expr *Callee = E->getCallee(); 1966 if (isa<MemberExpr>(Callee)) 1967 HandleValue(Callee); 1968 1969 Inherited::VisitCXXMemberCallExpr(E); 1970 } 1971 }; 1972 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E, 1973 ValueDecl *VD) { 1974 UninitializedFieldVisitor(S, VD).HandleExpr(E); 1975 } 1976} // namespace 1977 1978/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1979/// in-class initializer for a non-static C++ class member, and after 1980/// instantiating an in-class initializer in a class template. Such actions 1981/// are deferred until the class is complete. 1982void 1983Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 1984 Expr *InitExpr) { 1985 FieldDecl *FD = cast<FieldDecl>(D); 1986 assert(FD->getInClassInitStyle() != ICIS_NoInit && 1987 "must set init style when field is created"); 1988 1989 if (!InitExpr) { 1990 FD->setInvalidDecl(); 1991 FD->removeInClassInitializer(); 1992 return; 1993 } 1994 1995 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1996 FD->setInvalidDecl(); 1997 FD->removeInClassInitializer(); 1998 return; 1999 } 2000 2001 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, InitLoc) 2002 != DiagnosticsEngine::Ignored) { 2003 CheckInitExprContainsUninitializedFields(*this, InitExpr, FD); 2004 } 2005 2006 ExprResult Init = InitExpr; 2007 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 2008 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 2009 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 2010 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 2011 } 2012 Expr **Inits = &InitExpr; 2013 unsigned NumInits = 1; 2014 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 2015 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 2016 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 2017 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 2018 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 2019 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 2020 if (Init.isInvalid()) { 2021 FD->setInvalidDecl(); 2022 return; 2023 } 2024 } 2025 2026 // C++11 [class.base.init]p7: 2027 // The initialization of each base and member constitutes a 2028 // full-expression. 2029 Init = ActOnFinishFullExpr(Init.take(), InitLoc); 2030 if (Init.isInvalid()) { 2031 FD->setInvalidDecl(); 2032 return; 2033 } 2034 2035 InitExpr = Init.release(); 2036 2037 FD->setInClassInitializer(InitExpr); 2038} 2039 2040/// \brief Find the direct and/or virtual base specifiers that 2041/// correspond to the given base type, for use in base initialization 2042/// within a constructor. 2043static bool FindBaseInitializer(Sema &SemaRef, 2044 CXXRecordDecl *ClassDecl, 2045 QualType BaseType, 2046 const CXXBaseSpecifier *&DirectBaseSpec, 2047 const CXXBaseSpecifier *&VirtualBaseSpec) { 2048 // First, check for a direct base class. 2049 DirectBaseSpec = 0; 2050 for (CXXRecordDecl::base_class_const_iterator Base 2051 = ClassDecl->bases_begin(); 2052 Base != ClassDecl->bases_end(); ++Base) { 2053 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 2054 // We found a direct base of this type. That's what we're 2055 // initializing. 2056 DirectBaseSpec = &*Base; 2057 break; 2058 } 2059 } 2060 2061 // Check for a virtual base class. 2062 // FIXME: We might be able to short-circuit this if we know in advance that 2063 // there are no virtual bases. 2064 VirtualBaseSpec = 0; 2065 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 2066 // We haven't found a base yet; search the class hierarchy for a 2067 // virtual base class. 2068 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 2069 /*DetectVirtual=*/false); 2070 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 2071 BaseType, Paths)) { 2072 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 2073 Path != Paths.end(); ++Path) { 2074 if (Path->back().Base->isVirtual()) { 2075 VirtualBaseSpec = Path->back().Base; 2076 break; 2077 } 2078 } 2079 } 2080 } 2081 2082 return DirectBaseSpec || VirtualBaseSpec; 2083} 2084 2085/// \brief Handle a C++ member initializer using braced-init-list syntax. 2086MemInitResult 2087Sema::ActOnMemInitializer(Decl *ConstructorD, 2088 Scope *S, 2089 CXXScopeSpec &SS, 2090 IdentifierInfo *MemberOrBase, 2091 ParsedType TemplateTypeTy, 2092 const DeclSpec &DS, 2093 SourceLocation IdLoc, 2094 Expr *InitList, 2095 SourceLocation EllipsisLoc) { 2096 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2097 DS, IdLoc, InitList, 2098 EllipsisLoc); 2099} 2100 2101/// \brief Handle a C++ member initializer using parentheses syntax. 2102MemInitResult 2103Sema::ActOnMemInitializer(Decl *ConstructorD, 2104 Scope *S, 2105 CXXScopeSpec &SS, 2106 IdentifierInfo *MemberOrBase, 2107 ParsedType TemplateTypeTy, 2108 const DeclSpec &DS, 2109 SourceLocation IdLoc, 2110 SourceLocation LParenLoc, 2111 Expr **Args, unsigned NumArgs, 2112 SourceLocation RParenLoc, 2113 SourceLocation EllipsisLoc) { 2114 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, 2115 llvm::makeArrayRef(Args, NumArgs), 2116 RParenLoc); 2117 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2118 DS, IdLoc, List, EllipsisLoc); 2119} 2120 2121namespace { 2122 2123// Callback to only accept typo corrections that can be a valid C++ member 2124// intializer: either a non-static field member or a base class. 2125class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 2126 public: 2127 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 2128 : ClassDecl(ClassDecl) {} 2129 2130 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 2131 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 2132 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 2133 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 2134 else 2135 return isa<TypeDecl>(ND); 2136 } 2137 return false; 2138 } 2139 2140 private: 2141 CXXRecordDecl *ClassDecl; 2142}; 2143 2144} 2145 2146/// \brief Handle a C++ member initializer. 2147MemInitResult 2148Sema::BuildMemInitializer(Decl *ConstructorD, 2149 Scope *S, 2150 CXXScopeSpec &SS, 2151 IdentifierInfo *MemberOrBase, 2152 ParsedType TemplateTypeTy, 2153 const DeclSpec &DS, 2154 SourceLocation IdLoc, 2155 Expr *Init, 2156 SourceLocation EllipsisLoc) { 2157 if (!ConstructorD) 2158 return true; 2159 2160 AdjustDeclIfTemplate(ConstructorD); 2161 2162 CXXConstructorDecl *Constructor 2163 = dyn_cast<CXXConstructorDecl>(ConstructorD); 2164 if (!Constructor) { 2165 // The user wrote a constructor initializer on a function that is 2166 // not a C++ constructor. Ignore the error for now, because we may 2167 // have more member initializers coming; we'll diagnose it just 2168 // once in ActOnMemInitializers. 2169 return true; 2170 } 2171 2172 CXXRecordDecl *ClassDecl = Constructor->getParent(); 2173 2174 // C++ [class.base.init]p2: 2175 // Names in a mem-initializer-id are looked up in the scope of the 2176 // constructor's class and, if not found in that scope, are looked 2177 // up in the scope containing the constructor's definition. 2178 // [Note: if the constructor's class contains a member with the 2179 // same name as a direct or virtual base class of the class, a 2180 // mem-initializer-id naming the member or base class and composed 2181 // of a single identifier refers to the class member. A 2182 // mem-initializer-id for the hidden base class may be specified 2183 // using a qualified name. ] 2184 if (!SS.getScopeRep() && !TemplateTypeTy) { 2185 // Look for a member, first. 2186 DeclContext::lookup_result Result 2187 = ClassDecl->lookup(MemberOrBase); 2188 if (!Result.empty()) { 2189 ValueDecl *Member; 2190 if ((Member = dyn_cast<FieldDecl>(Result.front())) || 2191 (Member = dyn_cast<IndirectFieldDecl>(Result.front()))) { 2192 if (EllipsisLoc.isValid()) 2193 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 2194 << MemberOrBase 2195 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 2196 2197 return BuildMemberInitializer(Member, Init, IdLoc); 2198 } 2199 } 2200 } 2201 // It didn't name a member, so see if it names a class. 2202 QualType BaseType; 2203 TypeSourceInfo *TInfo = 0; 2204 2205 if (TemplateTypeTy) { 2206 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 2207 } else if (DS.getTypeSpecType() == TST_decltype) { 2208 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 2209 } else { 2210 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 2211 LookupParsedName(R, S, &SS); 2212 2213 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 2214 if (!TyD) { 2215 if (R.isAmbiguous()) return true; 2216 2217 // We don't want access-control diagnostics here. 2218 R.suppressDiagnostics(); 2219 2220 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 2221 bool NotUnknownSpecialization = false; 2222 DeclContext *DC = computeDeclContext(SS, false); 2223 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 2224 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 2225 2226 if (!NotUnknownSpecialization) { 2227 // When the scope specifier can refer to a member of an unknown 2228 // specialization, we take it as a type name. 2229 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 2230 SS.getWithLocInContext(Context), 2231 *MemberOrBase, IdLoc); 2232 if (BaseType.isNull()) 2233 return true; 2234 2235 R.clear(); 2236 R.setLookupName(MemberOrBase); 2237 } 2238 } 2239 2240 // If no results were found, try to correct typos. 2241 TypoCorrection Corr; 2242 MemInitializerValidatorCCC Validator(ClassDecl); 2243 if (R.empty() && BaseType.isNull() && 2244 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 2245 Validator, ClassDecl))) { 2246 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 2247 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 2248 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 2249 // We have found a non-static data member with a similar 2250 // name to what was typed; complain and initialize that 2251 // member. 2252 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2253 << MemberOrBase << true << CorrectedQuotedStr 2254 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2255 Diag(Member->getLocation(), diag::note_previous_decl) 2256 << CorrectedQuotedStr; 2257 2258 return BuildMemberInitializer(Member, Init, IdLoc); 2259 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 2260 const CXXBaseSpecifier *DirectBaseSpec; 2261 const CXXBaseSpecifier *VirtualBaseSpec; 2262 if (FindBaseInitializer(*this, ClassDecl, 2263 Context.getTypeDeclType(Type), 2264 DirectBaseSpec, VirtualBaseSpec)) { 2265 // We have found a direct or virtual base class with a 2266 // similar name to what was typed; complain and initialize 2267 // that base class. 2268 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2269 << MemberOrBase << false << CorrectedQuotedStr 2270 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2271 2272 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 2273 : VirtualBaseSpec; 2274 Diag(BaseSpec->getLocStart(), 2275 diag::note_base_class_specified_here) 2276 << BaseSpec->getType() 2277 << BaseSpec->getSourceRange(); 2278 2279 TyD = Type; 2280 } 2281 } 2282 } 2283 2284 if (!TyD && BaseType.isNull()) { 2285 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 2286 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 2287 return true; 2288 } 2289 } 2290 2291 if (BaseType.isNull()) { 2292 BaseType = Context.getTypeDeclType(TyD); 2293 if (SS.isSet()) { 2294 NestedNameSpecifier *Qualifier = 2295 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2296 2297 // FIXME: preserve source range information 2298 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 2299 } 2300 } 2301 } 2302 2303 if (!TInfo) 2304 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 2305 2306 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 2307} 2308 2309/// Checks a member initializer expression for cases where reference (or 2310/// pointer) members are bound to by-value parameters (or their addresses). 2311static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 2312 Expr *Init, 2313 SourceLocation IdLoc) { 2314 QualType MemberTy = Member->getType(); 2315 2316 // We only handle pointers and references currently. 2317 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 2318 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 2319 return; 2320 2321 const bool IsPointer = MemberTy->isPointerType(); 2322 if (IsPointer) { 2323 if (const UnaryOperator *Op 2324 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2325 // The only case we're worried about with pointers requires taking the 2326 // address. 2327 if (Op->getOpcode() != UO_AddrOf) 2328 return; 2329 2330 Init = Op->getSubExpr(); 2331 } else { 2332 // We only handle address-of expression initializers for pointers. 2333 return; 2334 } 2335 } 2336 2337 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 2338 // Taking the address of a temporary will be diagnosed as a hard error. 2339 if (IsPointer) 2340 return; 2341 2342 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 2343 << Member << Init->getSourceRange(); 2344 } else if (const DeclRefExpr *DRE 2345 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2346 // We only warn when referring to a non-reference parameter declaration. 2347 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2348 if (!Parameter || Parameter->getType()->isReferenceType()) 2349 return; 2350 2351 S.Diag(Init->getExprLoc(), 2352 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2353 : diag::warn_bind_ref_member_to_parameter) 2354 << Member << Parameter << Init->getSourceRange(); 2355 } else { 2356 // Other initializers are fine. 2357 return; 2358 } 2359 2360 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2361 << (unsigned)IsPointer; 2362} 2363 2364MemInitResult 2365Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2366 SourceLocation IdLoc) { 2367 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2368 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2369 assert((DirectMember || IndirectMember) && 2370 "Member must be a FieldDecl or IndirectFieldDecl"); 2371 2372 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2373 return true; 2374 2375 if (Member->isInvalidDecl()) 2376 return true; 2377 2378 // Diagnose value-uses of fields to initialize themselves, e.g. 2379 // foo(foo) 2380 // where foo is not also a parameter to the constructor. 2381 // TODO: implement -Wuninitialized and fold this into that framework. 2382 Expr **Args; 2383 unsigned NumArgs; 2384 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2385 Args = ParenList->getExprs(); 2386 NumArgs = ParenList->getNumExprs(); 2387 } else if (InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) { 2388 Args = InitList->getInits(); 2389 NumArgs = InitList->getNumInits(); 2390 } else { 2391 // Template instantiation doesn't reconstruct ParenListExprs for us. 2392 Args = &Init; 2393 NumArgs = 1; 2394 } 2395 2396 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc) 2397 != DiagnosticsEngine::Ignored) 2398 for (unsigned i = 0; i < NumArgs; ++i) 2399 // FIXME: Warn about the case when other fields are used before being 2400 // initialized. For example, let this field be the i'th field. When 2401 // initializing the i'th field, throw a warning if any of the >= i'th 2402 // fields are used, as they are not yet initialized. 2403 // Right now we are only handling the case where the i'th field uses 2404 // itself in its initializer. 2405 // Also need to take into account that some fields may be initialized by 2406 // in-class initializers, see C++11 [class.base.init]p9. 2407 CheckInitExprContainsUninitializedFields(*this, Args[i], Member); 2408 2409 SourceRange InitRange = Init->getSourceRange(); 2410 2411 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2412 // Can't check initialization for a member of dependent type or when 2413 // any of the arguments are type-dependent expressions. 2414 DiscardCleanupsInEvaluationContext(); 2415 } else { 2416 bool InitList = false; 2417 if (isa<InitListExpr>(Init)) { 2418 InitList = true; 2419 Args = &Init; 2420 NumArgs = 1; 2421 2422 if (isStdInitializerList(Member->getType(), 0)) { 2423 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2424 << /*at end of ctor*/1 << InitRange; 2425 } 2426 } 2427 2428 // Initialize the member. 2429 InitializedEntity MemberEntity = 2430 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2431 : InitializedEntity::InitializeMember(IndirectMember, 0); 2432 InitializationKind Kind = 2433 InitList ? InitializationKind::CreateDirectList(IdLoc) 2434 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2435 InitRange.getEnd()); 2436 2437 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2438 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2439 MultiExprArg(Args, NumArgs), 2440 0); 2441 if (MemberInit.isInvalid()) 2442 return true; 2443 2444 // C++11 [class.base.init]p7: 2445 // The initialization of each base and member constitutes a 2446 // full-expression. 2447 MemberInit = ActOnFinishFullExpr(MemberInit.get(), InitRange.getBegin()); 2448 if (MemberInit.isInvalid()) 2449 return true; 2450 2451 Init = MemberInit.get(); 2452 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2453 } 2454 2455 if (DirectMember) { 2456 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2457 InitRange.getBegin(), Init, 2458 InitRange.getEnd()); 2459 } else { 2460 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2461 InitRange.getBegin(), Init, 2462 InitRange.getEnd()); 2463 } 2464} 2465 2466MemInitResult 2467Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2468 CXXRecordDecl *ClassDecl) { 2469 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2470 if (!LangOpts.CPlusPlus11) 2471 return Diag(NameLoc, diag::err_delegating_ctor) 2472 << TInfo->getTypeLoc().getLocalSourceRange(); 2473 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2474 2475 bool InitList = true; 2476 Expr **Args = &Init; 2477 unsigned NumArgs = 1; 2478 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2479 InitList = false; 2480 Args = ParenList->getExprs(); 2481 NumArgs = ParenList->getNumExprs(); 2482 } 2483 2484 SourceRange InitRange = Init->getSourceRange(); 2485 // Initialize the object. 2486 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2487 QualType(ClassDecl->getTypeForDecl(), 0)); 2488 InitializationKind Kind = 2489 InitList ? InitializationKind::CreateDirectList(NameLoc) 2490 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2491 InitRange.getEnd()); 2492 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2493 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2494 MultiExprArg(Args, NumArgs), 2495 0); 2496 if (DelegationInit.isInvalid()) 2497 return true; 2498 2499 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2500 "Delegating constructor with no target?"); 2501 2502 // C++11 [class.base.init]p7: 2503 // The initialization of each base and member constitutes a 2504 // full-expression. 2505 DelegationInit = ActOnFinishFullExpr(DelegationInit.get(), 2506 InitRange.getBegin()); 2507 if (DelegationInit.isInvalid()) 2508 return true; 2509 2510 // If we are in a dependent context, template instantiation will 2511 // perform this type-checking again. Just save the arguments that we 2512 // received in a ParenListExpr. 2513 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2514 // of the information that we have about the base 2515 // initializer. However, deconstructing the ASTs is a dicey process, 2516 // and this approach is far more likely to get the corner cases right. 2517 if (CurContext->isDependentContext()) 2518 DelegationInit = Owned(Init); 2519 2520 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2521 DelegationInit.takeAs<Expr>(), 2522 InitRange.getEnd()); 2523} 2524 2525MemInitResult 2526Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2527 Expr *Init, CXXRecordDecl *ClassDecl, 2528 SourceLocation EllipsisLoc) { 2529 SourceLocation BaseLoc 2530 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2531 2532 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2533 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2534 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2535 2536 // C++ [class.base.init]p2: 2537 // [...] Unless the mem-initializer-id names a nonstatic data 2538 // member of the constructor's class or a direct or virtual base 2539 // of that class, the mem-initializer is ill-formed. A 2540 // mem-initializer-list can initialize a base class using any 2541 // name that denotes that base class type. 2542 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2543 2544 SourceRange InitRange = Init->getSourceRange(); 2545 if (EllipsisLoc.isValid()) { 2546 // This is a pack expansion. 2547 if (!BaseType->containsUnexpandedParameterPack()) { 2548 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2549 << SourceRange(BaseLoc, InitRange.getEnd()); 2550 2551 EllipsisLoc = SourceLocation(); 2552 } 2553 } else { 2554 // Check for any unexpanded parameter packs. 2555 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2556 return true; 2557 2558 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2559 return true; 2560 } 2561 2562 // Check for direct and virtual base classes. 2563 const CXXBaseSpecifier *DirectBaseSpec = 0; 2564 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2565 if (!Dependent) { 2566 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2567 BaseType)) 2568 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2569 2570 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2571 VirtualBaseSpec); 2572 2573 // C++ [base.class.init]p2: 2574 // Unless the mem-initializer-id names a nonstatic data member of the 2575 // constructor's class or a direct or virtual base of that class, the 2576 // mem-initializer is ill-formed. 2577 if (!DirectBaseSpec && !VirtualBaseSpec) { 2578 // If the class has any dependent bases, then it's possible that 2579 // one of those types will resolve to the same type as 2580 // BaseType. Therefore, just treat this as a dependent base 2581 // class initialization. FIXME: Should we try to check the 2582 // initialization anyway? It seems odd. 2583 if (ClassDecl->hasAnyDependentBases()) 2584 Dependent = true; 2585 else 2586 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2587 << BaseType << Context.getTypeDeclType(ClassDecl) 2588 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2589 } 2590 } 2591 2592 if (Dependent) { 2593 DiscardCleanupsInEvaluationContext(); 2594 2595 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2596 /*IsVirtual=*/false, 2597 InitRange.getBegin(), Init, 2598 InitRange.getEnd(), EllipsisLoc); 2599 } 2600 2601 // C++ [base.class.init]p2: 2602 // If a mem-initializer-id is ambiguous because it designates both 2603 // a direct non-virtual base class and an inherited virtual base 2604 // class, the mem-initializer is ill-formed. 2605 if (DirectBaseSpec && VirtualBaseSpec) 2606 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2607 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2608 2609 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2610 if (!BaseSpec) 2611 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2612 2613 // Initialize the base. 2614 bool InitList = true; 2615 Expr **Args = &Init; 2616 unsigned NumArgs = 1; 2617 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2618 InitList = false; 2619 Args = ParenList->getExprs(); 2620 NumArgs = ParenList->getNumExprs(); 2621 } 2622 2623 InitializedEntity BaseEntity = 2624 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2625 InitializationKind Kind = 2626 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2627 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2628 InitRange.getEnd()); 2629 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2630 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2631 MultiExprArg(Args, NumArgs), 0); 2632 if (BaseInit.isInvalid()) 2633 return true; 2634 2635 // C++11 [class.base.init]p7: 2636 // The initialization of each base and member constitutes a 2637 // full-expression. 2638 BaseInit = ActOnFinishFullExpr(BaseInit.get(), InitRange.getBegin()); 2639 if (BaseInit.isInvalid()) 2640 return true; 2641 2642 // If we are in a dependent context, template instantiation will 2643 // perform this type-checking again. Just save the arguments that we 2644 // received in a ParenListExpr. 2645 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2646 // of the information that we have about the base 2647 // initializer. However, deconstructing the ASTs is a dicey process, 2648 // and this approach is far more likely to get the corner cases right. 2649 if (CurContext->isDependentContext()) 2650 BaseInit = Owned(Init); 2651 2652 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2653 BaseSpec->isVirtual(), 2654 InitRange.getBegin(), 2655 BaseInit.takeAs<Expr>(), 2656 InitRange.getEnd(), EllipsisLoc); 2657} 2658 2659// Create a static_cast\<T&&>(expr). 2660static Expr *CastForMoving(Sema &SemaRef, Expr *E, QualType T = QualType()) { 2661 if (T.isNull()) T = E->getType(); 2662 QualType TargetType = SemaRef.BuildReferenceType( 2663 T, /*SpelledAsLValue*/false, SourceLocation(), DeclarationName()); 2664 SourceLocation ExprLoc = E->getLocStart(); 2665 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2666 TargetType, ExprLoc); 2667 2668 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2669 SourceRange(ExprLoc, ExprLoc), 2670 E->getSourceRange()).take(); 2671} 2672 2673/// ImplicitInitializerKind - How an implicit base or member initializer should 2674/// initialize its base or member. 2675enum ImplicitInitializerKind { 2676 IIK_Default, 2677 IIK_Copy, 2678 IIK_Move, 2679 IIK_Inherit 2680}; 2681 2682static bool 2683BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2684 ImplicitInitializerKind ImplicitInitKind, 2685 CXXBaseSpecifier *BaseSpec, 2686 bool IsInheritedVirtualBase, 2687 CXXCtorInitializer *&CXXBaseInit) { 2688 InitializedEntity InitEntity 2689 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2690 IsInheritedVirtualBase); 2691 2692 ExprResult BaseInit; 2693 2694 switch (ImplicitInitKind) { 2695 case IIK_Inherit: { 2696 const CXXRecordDecl *Inherited = 2697 Constructor->getInheritedConstructor()->getParent(); 2698 const CXXRecordDecl *Base = BaseSpec->getType()->getAsCXXRecordDecl(); 2699 if (Base && Inherited->getCanonicalDecl() == Base->getCanonicalDecl()) { 2700 // C++11 [class.inhctor]p8: 2701 // Each expression in the expression-list is of the form 2702 // static_cast<T&&>(p), where p is the name of the corresponding 2703 // constructor parameter and T is the declared type of p. 2704 SmallVector<Expr*, 16> Args; 2705 for (unsigned I = 0, E = Constructor->getNumParams(); I != E; ++I) { 2706 ParmVarDecl *PD = Constructor->getParamDecl(I); 2707 ExprResult ArgExpr = 2708 SemaRef.BuildDeclRefExpr(PD, PD->getType().getNonReferenceType(), 2709 VK_LValue, SourceLocation()); 2710 if (ArgExpr.isInvalid()) 2711 return true; 2712 Args.push_back(CastForMoving(SemaRef, ArgExpr.take(), PD->getType())); 2713 } 2714 2715 InitializationKind InitKind = InitializationKind::CreateDirect( 2716 Constructor->getLocation(), SourceLocation(), SourceLocation()); 2717 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2718 Args.data(), Args.size()); 2719 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, Args); 2720 break; 2721 } 2722 } 2723 // Fall through. 2724 case IIK_Default: { 2725 InitializationKind InitKind 2726 = InitializationKind::CreateDefault(Constructor->getLocation()); 2727 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2728 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2729 break; 2730 } 2731 2732 case IIK_Move: 2733 case IIK_Copy: { 2734 bool Moving = ImplicitInitKind == IIK_Move; 2735 ParmVarDecl *Param = Constructor->getParamDecl(0); 2736 QualType ParamType = Param->getType().getNonReferenceType(); 2737 2738 Expr *CopyCtorArg = 2739 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2740 SourceLocation(), Param, false, 2741 Constructor->getLocation(), ParamType, 2742 VK_LValue, 0); 2743 2744 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2745 2746 // Cast to the base class to avoid ambiguities. 2747 QualType ArgTy = 2748 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2749 ParamType.getQualifiers()); 2750 2751 if (Moving) { 2752 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2753 } 2754 2755 CXXCastPath BasePath; 2756 BasePath.push_back(BaseSpec); 2757 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2758 CK_UncheckedDerivedToBase, 2759 Moving ? VK_XValue : VK_LValue, 2760 &BasePath).take(); 2761 2762 InitializationKind InitKind 2763 = InitializationKind::CreateDirect(Constructor->getLocation(), 2764 SourceLocation(), SourceLocation()); 2765 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2766 &CopyCtorArg, 1); 2767 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2768 MultiExprArg(&CopyCtorArg, 1)); 2769 break; 2770 } 2771 } 2772 2773 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2774 if (BaseInit.isInvalid()) 2775 return true; 2776 2777 CXXBaseInit = 2778 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2779 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2780 SourceLocation()), 2781 BaseSpec->isVirtual(), 2782 SourceLocation(), 2783 BaseInit.takeAs<Expr>(), 2784 SourceLocation(), 2785 SourceLocation()); 2786 2787 return false; 2788} 2789 2790static bool RefersToRValueRef(Expr *MemRef) { 2791 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2792 return Referenced->getType()->isRValueReferenceType(); 2793} 2794 2795static bool 2796BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2797 ImplicitInitializerKind ImplicitInitKind, 2798 FieldDecl *Field, IndirectFieldDecl *Indirect, 2799 CXXCtorInitializer *&CXXMemberInit) { 2800 if (Field->isInvalidDecl()) 2801 return true; 2802 2803 SourceLocation Loc = Constructor->getLocation(); 2804 2805 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2806 bool Moving = ImplicitInitKind == IIK_Move; 2807 ParmVarDecl *Param = Constructor->getParamDecl(0); 2808 QualType ParamType = Param->getType().getNonReferenceType(); 2809 2810 // Suppress copying zero-width bitfields. 2811 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2812 return false; 2813 2814 Expr *MemberExprBase = 2815 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2816 SourceLocation(), Param, false, 2817 Loc, ParamType, VK_LValue, 0); 2818 2819 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2820 2821 if (Moving) { 2822 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2823 } 2824 2825 // Build a reference to this field within the parameter. 2826 CXXScopeSpec SS; 2827 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2828 Sema::LookupMemberName); 2829 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2830 : cast<ValueDecl>(Field), AS_public); 2831 MemberLookup.resolveKind(); 2832 ExprResult CtorArg 2833 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2834 ParamType, Loc, 2835 /*IsArrow=*/false, 2836 SS, 2837 /*TemplateKWLoc=*/SourceLocation(), 2838 /*FirstQualifierInScope=*/0, 2839 MemberLookup, 2840 /*TemplateArgs=*/0); 2841 if (CtorArg.isInvalid()) 2842 return true; 2843 2844 // C++11 [class.copy]p15: 2845 // - if a member m has rvalue reference type T&&, it is direct-initialized 2846 // with static_cast<T&&>(x.m); 2847 if (RefersToRValueRef(CtorArg.get())) { 2848 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2849 } 2850 2851 // When the field we are copying is an array, create index variables for 2852 // each dimension of the array. We use these index variables to subscript 2853 // the source array, and other clients (e.g., CodeGen) will perform the 2854 // necessary iteration with these index variables. 2855 SmallVector<VarDecl *, 4> IndexVariables; 2856 QualType BaseType = Field->getType(); 2857 QualType SizeType = SemaRef.Context.getSizeType(); 2858 bool InitializingArray = false; 2859 while (const ConstantArrayType *Array 2860 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2861 InitializingArray = true; 2862 // Create the iteration variable for this array index. 2863 IdentifierInfo *IterationVarName = 0; 2864 { 2865 SmallString<8> Str; 2866 llvm::raw_svector_ostream OS(Str); 2867 OS << "__i" << IndexVariables.size(); 2868 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2869 } 2870 VarDecl *IterationVar 2871 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2872 IterationVarName, SizeType, 2873 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2874 SC_None); 2875 IndexVariables.push_back(IterationVar); 2876 2877 // Create a reference to the iteration variable. 2878 ExprResult IterationVarRef 2879 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2880 assert(!IterationVarRef.isInvalid() && 2881 "Reference to invented variable cannot fail!"); 2882 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2883 assert(!IterationVarRef.isInvalid() && 2884 "Conversion of invented variable cannot fail!"); 2885 2886 // Subscript the array with this iteration variable. 2887 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2888 IterationVarRef.take(), 2889 Loc); 2890 if (CtorArg.isInvalid()) 2891 return true; 2892 2893 BaseType = Array->getElementType(); 2894 } 2895 2896 // The array subscript expression is an lvalue, which is wrong for moving. 2897 if (Moving && InitializingArray) 2898 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2899 2900 // Construct the entity that we will be initializing. For an array, this 2901 // will be first element in the array, which may require several levels 2902 // of array-subscript entities. 2903 SmallVector<InitializedEntity, 4> Entities; 2904 Entities.reserve(1 + IndexVariables.size()); 2905 if (Indirect) 2906 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2907 else 2908 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2909 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2910 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2911 0, 2912 Entities.back())); 2913 2914 // Direct-initialize to use the copy constructor. 2915 InitializationKind InitKind = 2916 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2917 2918 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2919 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2920 &CtorArgE, 1); 2921 2922 ExprResult MemberInit 2923 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2924 MultiExprArg(&CtorArgE, 1)); 2925 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2926 if (MemberInit.isInvalid()) 2927 return true; 2928 2929 if (Indirect) { 2930 assert(IndexVariables.size() == 0 && 2931 "Indirect field improperly initialized"); 2932 CXXMemberInit 2933 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2934 Loc, Loc, 2935 MemberInit.takeAs<Expr>(), 2936 Loc); 2937 } else 2938 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2939 Loc, MemberInit.takeAs<Expr>(), 2940 Loc, 2941 IndexVariables.data(), 2942 IndexVariables.size()); 2943 return false; 2944 } 2945 2946 assert((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) && 2947 "Unhandled implicit init kind!"); 2948 2949 QualType FieldBaseElementType = 2950 SemaRef.Context.getBaseElementType(Field->getType()); 2951 2952 if (FieldBaseElementType->isRecordType()) { 2953 InitializedEntity InitEntity 2954 = Indirect? InitializedEntity::InitializeMember(Indirect) 2955 : InitializedEntity::InitializeMember(Field); 2956 InitializationKind InitKind = 2957 InitializationKind::CreateDefault(Loc); 2958 2959 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2960 ExprResult MemberInit = 2961 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2962 2963 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2964 if (MemberInit.isInvalid()) 2965 return true; 2966 2967 if (Indirect) 2968 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2969 Indirect, Loc, 2970 Loc, 2971 MemberInit.get(), 2972 Loc); 2973 else 2974 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2975 Field, Loc, Loc, 2976 MemberInit.get(), 2977 Loc); 2978 return false; 2979 } 2980 2981 if (!Field->getParent()->isUnion()) { 2982 if (FieldBaseElementType->isReferenceType()) { 2983 SemaRef.Diag(Constructor->getLocation(), 2984 diag::err_uninitialized_member_in_ctor) 2985 << (int)Constructor->isImplicit() 2986 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2987 << 0 << Field->getDeclName(); 2988 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2989 return true; 2990 } 2991 2992 if (FieldBaseElementType.isConstQualified()) { 2993 SemaRef.Diag(Constructor->getLocation(), 2994 diag::err_uninitialized_member_in_ctor) 2995 << (int)Constructor->isImplicit() 2996 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2997 << 1 << Field->getDeclName(); 2998 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2999 return true; 3000 } 3001 } 3002 3003 if (SemaRef.getLangOpts().ObjCAutoRefCount && 3004 FieldBaseElementType->isObjCRetainableType() && 3005 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 3006 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 3007 // ARC: 3008 // Default-initialize Objective-C pointers to NULL. 3009 CXXMemberInit 3010 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 3011 Loc, Loc, 3012 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 3013 Loc); 3014 return false; 3015 } 3016 3017 // Nothing to initialize. 3018 CXXMemberInit = 0; 3019 return false; 3020} 3021 3022namespace { 3023struct BaseAndFieldInfo { 3024 Sema &S; 3025 CXXConstructorDecl *Ctor; 3026 bool AnyErrorsInInits; 3027 ImplicitInitializerKind IIK; 3028 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 3029 SmallVector<CXXCtorInitializer*, 8> AllToInit; 3030 3031 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 3032 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 3033 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 3034 if (Generated && Ctor->isCopyConstructor()) 3035 IIK = IIK_Copy; 3036 else if (Generated && Ctor->isMoveConstructor()) 3037 IIK = IIK_Move; 3038 else if (Ctor->getInheritedConstructor()) 3039 IIK = IIK_Inherit; 3040 else 3041 IIK = IIK_Default; 3042 } 3043 3044 bool isImplicitCopyOrMove() const { 3045 switch (IIK) { 3046 case IIK_Copy: 3047 case IIK_Move: 3048 return true; 3049 3050 case IIK_Default: 3051 case IIK_Inherit: 3052 return false; 3053 } 3054 3055 llvm_unreachable("Invalid ImplicitInitializerKind!"); 3056 } 3057 3058 bool addFieldInitializer(CXXCtorInitializer *Init) { 3059 AllToInit.push_back(Init); 3060 3061 // Check whether this initializer makes the field "used". 3062 if (Init->getInit() && Init->getInit()->HasSideEffects(S.Context)) 3063 S.UnusedPrivateFields.remove(Init->getAnyMember()); 3064 3065 return false; 3066 } 3067}; 3068} 3069 3070/// \brief Determine whether the given indirect field declaration is somewhere 3071/// within an anonymous union. 3072static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 3073 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 3074 CEnd = F->chain_end(); 3075 C != CEnd; ++C) 3076 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 3077 if (Record->isUnion()) 3078 return true; 3079 3080 return false; 3081} 3082 3083/// \brief Determine whether the given type is an incomplete or zero-lenfgth 3084/// array type. 3085static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 3086 if (T->isIncompleteArrayType()) 3087 return true; 3088 3089 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 3090 if (!ArrayT->getSize()) 3091 return true; 3092 3093 T = ArrayT->getElementType(); 3094 } 3095 3096 return false; 3097} 3098 3099static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 3100 FieldDecl *Field, 3101 IndirectFieldDecl *Indirect = 0) { 3102 3103 // Overwhelmingly common case: we have a direct initializer for this field. 3104 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) 3105 return Info.addFieldInitializer(Init); 3106 3107 // C++11 [class.base.init]p8: if the entity is a non-static data member that 3108 // has a brace-or-equal-initializer, the entity is initialized as specified 3109 // in [dcl.init]. 3110 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 3111 CXXCtorInitializer *Init; 3112 if (Indirect) 3113 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 3114 SourceLocation(), 3115 SourceLocation(), 0, 3116 SourceLocation()); 3117 else 3118 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 3119 SourceLocation(), 3120 SourceLocation(), 0, 3121 SourceLocation()); 3122 return Info.addFieldInitializer(Init); 3123 } 3124 3125 // Don't build an implicit initializer for union members if none was 3126 // explicitly specified. 3127 if (Field->getParent()->isUnion() || 3128 (Indirect && isWithinAnonymousUnion(Indirect))) 3129 return false; 3130 3131 // Don't initialize incomplete or zero-length arrays. 3132 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 3133 return false; 3134 3135 // Don't try to build an implicit initializer if there were semantic 3136 // errors in any of the initializers (and therefore we might be 3137 // missing some that the user actually wrote). 3138 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 3139 return false; 3140 3141 CXXCtorInitializer *Init = 0; 3142 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 3143 Indirect, Init)) 3144 return true; 3145 3146 if (!Init) 3147 return false; 3148 3149 return Info.addFieldInitializer(Init); 3150} 3151 3152bool 3153Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 3154 CXXCtorInitializer *Initializer) { 3155 assert(Initializer->isDelegatingInitializer()); 3156 Constructor->setNumCtorInitializers(1); 3157 CXXCtorInitializer **initializer = 3158 new (Context) CXXCtorInitializer*[1]; 3159 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 3160 Constructor->setCtorInitializers(initializer); 3161 3162 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 3163 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 3164 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 3165 } 3166 3167 DelegatingCtorDecls.push_back(Constructor); 3168 3169 return false; 3170} 3171 3172bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors, 3173 ArrayRef<CXXCtorInitializer *> Initializers) { 3174 if (Constructor->isDependentContext()) { 3175 // Just store the initializers as written, they will be checked during 3176 // instantiation. 3177 if (!Initializers.empty()) { 3178 Constructor->setNumCtorInitializers(Initializers.size()); 3179 CXXCtorInitializer **baseOrMemberInitializers = 3180 new (Context) CXXCtorInitializer*[Initializers.size()]; 3181 memcpy(baseOrMemberInitializers, Initializers.data(), 3182 Initializers.size() * sizeof(CXXCtorInitializer*)); 3183 Constructor->setCtorInitializers(baseOrMemberInitializers); 3184 } 3185 3186 // Let template instantiation know whether we had errors. 3187 if (AnyErrors) 3188 Constructor->setInvalidDecl(); 3189 3190 return false; 3191 } 3192 3193 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 3194 3195 // We need to build the initializer AST according to order of construction 3196 // and not what user specified in the Initializers list. 3197 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 3198 if (!ClassDecl) 3199 return true; 3200 3201 bool HadError = false; 3202 3203 for (unsigned i = 0; i < Initializers.size(); i++) { 3204 CXXCtorInitializer *Member = Initializers[i]; 3205 3206 if (Member->isBaseInitializer()) 3207 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 3208 else 3209 Info.AllBaseFields[Member->getAnyMember()] = Member; 3210 } 3211 3212 // Keep track of the direct virtual bases. 3213 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 3214 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 3215 E = ClassDecl->bases_end(); I != E; ++I) { 3216 if (I->isVirtual()) 3217 DirectVBases.insert(I); 3218 } 3219 3220 // Push virtual bases before others. 3221 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3222 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3223 3224 if (CXXCtorInitializer *Value 3225 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 3226 Info.AllToInit.push_back(Value); 3227 } else if (!AnyErrors) { 3228 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 3229 CXXCtorInitializer *CXXBaseInit; 3230 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3231 VBase, IsInheritedVirtualBase, 3232 CXXBaseInit)) { 3233 HadError = true; 3234 continue; 3235 } 3236 3237 Info.AllToInit.push_back(CXXBaseInit); 3238 } 3239 } 3240 3241 // Non-virtual bases. 3242 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3243 E = ClassDecl->bases_end(); Base != E; ++Base) { 3244 // Virtuals are in the virtual base list and already constructed. 3245 if (Base->isVirtual()) 3246 continue; 3247 3248 if (CXXCtorInitializer *Value 3249 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3250 Info.AllToInit.push_back(Value); 3251 } else if (!AnyErrors) { 3252 CXXCtorInitializer *CXXBaseInit; 3253 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3254 Base, /*IsInheritedVirtualBase=*/false, 3255 CXXBaseInit)) { 3256 HadError = true; 3257 continue; 3258 } 3259 3260 Info.AllToInit.push_back(CXXBaseInit); 3261 } 3262 } 3263 3264 // Fields. 3265 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3266 MemEnd = ClassDecl->decls_end(); 3267 Mem != MemEnd; ++Mem) { 3268 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3269 // C++ [class.bit]p2: 3270 // A declaration for a bit-field that omits the identifier declares an 3271 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3272 // initialized. 3273 if (F->isUnnamedBitfield()) 3274 continue; 3275 3276 // If we're not generating the implicit copy/move constructor, then we'll 3277 // handle anonymous struct/union fields based on their individual 3278 // indirect fields. 3279 if (F->isAnonymousStructOrUnion() && !Info.isImplicitCopyOrMove()) 3280 continue; 3281 3282 if (CollectFieldInitializer(*this, Info, F)) 3283 HadError = true; 3284 continue; 3285 } 3286 3287 // Beyond this point, we only consider default initialization. 3288 if (Info.isImplicitCopyOrMove()) 3289 continue; 3290 3291 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3292 if (F->getType()->isIncompleteArrayType()) { 3293 assert(ClassDecl->hasFlexibleArrayMember() && 3294 "Incomplete array type is not valid"); 3295 continue; 3296 } 3297 3298 // Initialize each field of an anonymous struct individually. 3299 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3300 HadError = true; 3301 3302 continue; 3303 } 3304 } 3305 3306 unsigned NumInitializers = Info.AllToInit.size(); 3307 if (NumInitializers > 0) { 3308 Constructor->setNumCtorInitializers(NumInitializers); 3309 CXXCtorInitializer **baseOrMemberInitializers = 3310 new (Context) CXXCtorInitializer*[NumInitializers]; 3311 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3312 NumInitializers * sizeof(CXXCtorInitializer*)); 3313 Constructor->setCtorInitializers(baseOrMemberInitializers); 3314 3315 // Constructors implicitly reference the base and member 3316 // destructors. 3317 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3318 Constructor->getParent()); 3319 } 3320 3321 return HadError; 3322} 3323 3324static void PopulateKeysForFields(FieldDecl *Field, SmallVectorImpl<const void*> &IdealInits) { 3325 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3326 const RecordDecl *RD = RT->getDecl(); 3327 if (RD->isAnonymousStructOrUnion()) { 3328 for (RecordDecl::field_iterator Field = RD->field_begin(), 3329 E = RD->field_end(); Field != E; ++Field) 3330 PopulateKeysForFields(*Field, IdealInits); 3331 return; 3332 } 3333 } 3334 IdealInits.push_back(Field); 3335} 3336 3337static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3338 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3339} 3340 3341static void *GetKeyForMember(ASTContext &Context, 3342 CXXCtorInitializer *Member) { 3343 if (!Member->isAnyMemberInitializer()) 3344 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3345 3346 return Member->getAnyMember(); 3347} 3348 3349static void DiagnoseBaseOrMemInitializerOrder( 3350 Sema &SemaRef, const CXXConstructorDecl *Constructor, 3351 ArrayRef<CXXCtorInitializer *> Inits) { 3352 if (Constructor->getDeclContext()->isDependentContext()) 3353 return; 3354 3355 // Don't check initializers order unless the warning is enabled at the 3356 // location of at least one initializer. 3357 bool ShouldCheckOrder = false; 3358 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { 3359 CXXCtorInitializer *Init = Inits[InitIndex]; 3360 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3361 Init->getSourceLocation()) 3362 != DiagnosticsEngine::Ignored) { 3363 ShouldCheckOrder = true; 3364 break; 3365 } 3366 } 3367 if (!ShouldCheckOrder) 3368 return; 3369 3370 // Build the list of bases and members in the order that they'll 3371 // actually be initialized. The explicit initializers should be in 3372 // this same order but may be missing things. 3373 SmallVector<const void*, 32> IdealInitKeys; 3374 3375 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3376 3377 // 1. Virtual bases. 3378 for (CXXRecordDecl::base_class_const_iterator VBase = 3379 ClassDecl->vbases_begin(), 3380 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3381 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3382 3383 // 2. Non-virtual bases. 3384 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3385 E = ClassDecl->bases_end(); Base != E; ++Base) { 3386 if (Base->isVirtual()) 3387 continue; 3388 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3389 } 3390 3391 // 3. Direct fields. 3392 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3393 E = ClassDecl->field_end(); Field != E; ++Field) { 3394 if (Field->isUnnamedBitfield()) 3395 continue; 3396 3397 PopulateKeysForFields(*Field, IdealInitKeys); 3398 } 3399 3400 unsigned NumIdealInits = IdealInitKeys.size(); 3401 unsigned IdealIndex = 0; 3402 3403 CXXCtorInitializer *PrevInit = 0; 3404 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { 3405 CXXCtorInitializer *Init = Inits[InitIndex]; 3406 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3407 3408 // Scan forward to try to find this initializer in the idealized 3409 // initializers list. 3410 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3411 if (InitKey == IdealInitKeys[IdealIndex]) 3412 break; 3413 3414 // If we didn't find this initializer, it must be because we 3415 // scanned past it on a previous iteration. That can only 3416 // happen if we're out of order; emit a warning. 3417 if (IdealIndex == NumIdealInits && PrevInit) { 3418 Sema::SemaDiagnosticBuilder D = 3419 SemaRef.Diag(PrevInit->getSourceLocation(), 3420 diag::warn_initializer_out_of_order); 3421 3422 if (PrevInit->isAnyMemberInitializer()) 3423 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3424 else 3425 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3426 3427 if (Init->isAnyMemberInitializer()) 3428 D << 0 << Init->getAnyMember()->getDeclName(); 3429 else 3430 D << 1 << Init->getTypeSourceInfo()->getType(); 3431 3432 // Move back to the initializer's location in the ideal list. 3433 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3434 if (InitKey == IdealInitKeys[IdealIndex]) 3435 break; 3436 3437 assert(IdealIndex != NumIdealInits && 3438 "initializer not found in initializer list"); 3439 } 3440 3441 PrevInit = Init; 3442 } 3443} 3444 3445namespace { 3446bool CheckRedundantInit(Sema &S, 3447 CXXCtorInitializer *Init, 3448 CXXCtorInitializer *&PrevInit) { 3449 if (!PrevInit) { 3450 PrevInit = Init; 3451 return false; 3452 } 3453 3454 if (FieldDecl *Field = Init->getAnyMember()) 3455 S.Diag(Init->getSourceLocation(), 3456 diag::err_multiple_mem_initialization) 3457 << Field->getDeclName() 3458 << Init->getSourceRange(); 3459 else { 3460 const Type *BaseClass = Init->getBaseClass(); 3461 assert(BaseClass && "neither field nor base"); 3462 S.Diag(Init->getSourceLocation(), 3463 diag::err_multiple_base_initialization) 3464 << QualType(BaseClass, 0) 3465 << Init->getSourceRange(); 3466 } 3467 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3468 << 0 << PrevInit->getSourceRange(); 3469 3470 return true; 3471} 3472 3473typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3474typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3475 3476bool CheckRedundantUnionInit(Sema &S, 3477 CXXCtorInitializer *Init, 3478 RedundantUnionMap &Unions) { 3479 FieldDecl *Field = Init->getAnyMember(); 3480 RecordDecl *Parent = Field->getParent(); 3481 NamedDecl *Child = Field; 3482 3483 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3484 if (Parent->isUnion()) { 3485 UnionEntry &En = Unions[Parent]; 3486 if (En.first && En.first != Child) { 3487 S.Diag(Init->getSourceLocation(), 3488 diag::err_multiple_mem_union_initialization) 3489 << Field->getDeclName() 3490 << Init->getSourceRange(); 3491 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3492 << 0 << En.second->getSourceRange(); 3493 return true; 3494 } 3495 if (!En.first) { 3496 En.first = Child; 3497 En.second = Init; 3498 } 3499 if (!Parent->isAnonymousStructOrUnion()) 3500 return false; 3501 } 3502 3503 Child = Parent; 3504 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3505 } 3506 3507 return false; 3508} 3509} 3510 3511/// ActOnMemInitializers - Handle the member initializers for a constructor. 3512void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3513 SourceLocation ColonLoc, 3514 ArrayRef<CXXCtorInitializer*> MemInits, 3515 bool AnyErrors) { 3516 if (!ConstructorDecl) 3517 return; 3518 3519 AdjustDeclIfTemplate(ConstructorDecl); 3520 3521 CXXConstructorDecl *Constructor 3522 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3523 3524 if (!Constructor) { 3525 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3526 return; 3527 } 3528 3529 // Mapping for the duplicate initializers check. 3530 // For member initializers, this is keyed with a FieldDecl*. 3531 // For base initializers, this is keyed with a Type*. 3532 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3533 3534 // Mapping for the inconsistent anonymous-union initializers check. 3535 RedundantUnionMap MemberUnions; 3536 3537 bool HadError = false; 3538 for (unsigned i = 0; i < MemInits.size(); i++) { 3539 CXXCtorInitializer *Init = MemInits[i]; 3540 3541 // Set the source order index. 3542 Init->setSourceOrder(i); 3543 3544 if (Init->isAnyMemberInitializer()) { 3545 FieldDecl *Field = Init->getAnyMember(); 3546 if (CheckRedundantInit(*this, Init, Members[Field]) || 3547 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3548 HadError = true; 3549 } else if (Init->isBaseInitializer()) { 3550 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3551 if (CheckRedundantInit(*this, Init, Members[Key])) 3552 HadError = true; 3553 } else { 3554 assert(Init->isDelegatingInitializer()); 3555 // This must be the only initializer 3556 if (MemInits.size() != 1) { 3557 Diag(Init->getSourceLocation(), 3558 diag::err_delegating_initializer_alone) 3559 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange(); 3560 // We will treat this as being the only initializer. 3561 } 3562 SetDelegatingInitializer(Constructor, MemInits[i]); 3563 // Return immediately as the initializer is set. 3564 return; 3565 } 3566 } 3567 3568 if (HadError) 3569 return; 3570 3571 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits); 3572 3573 SetCtorInitializers(Constructor, AnyErrors, MemInits); 3574} 3575 3576void 3577Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3578 CXXRecordDecl *ClassDecl) { 3579 // Ignore dependent contexts. Also ignore unions, since their members never 3580 // have destructors implicitly called. 3581 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3582 return; 3583 3584 // FIXME: all the access-control diagnostics are positioned on the 3585 // field/base declaration. That's probably good; that said, the 3586 // user might reasonably want to know why the destructor is being 3587 // emitted, and we currently don't say. 3588 3589 // Non-static data members. 3590 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3591 E = ClassDecl->field_end(); I != E; ++I) { 3592 FieldDecl *Field = *I; 3593 if (Field->isInvalidDecl()) 3594 continue; 3595 3596 // Don't destroy incomplete or zero-length arrays. 3597 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3598 continue; 3599 3600 QualType FieldType = Context.getBaseElementType(Field->getType()); 3601 3602 const RecordType* RT = FieldType->getAs<RecordType>(); 3603 if (!RT) 3604 continue; 3605 3606 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3607 if (FieldClassDecl->isInvalidDecl()) 3608 continue; 3609 if (FieldClassDecl->hasIrrelevantDestructor()) 3610 continue; 3611 // The destructor for an implicit anonymous union member is never invoked. 3612 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3613 continue; 3614 3615 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3616 assert(Dtor && "No dtor found for FieldClassDecl!"); 3617 CheckDestructorAccess(Field->getLocation(), Dtor, 3618 PDiag(diag::err_access_dtor_field) 3619 << Field->getDeclName() 3620 << FieldType); 3621 3622 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3623 DiagnoseUseOfDecl(Dtor, Location); 3624 } 3625 3626 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3627 3628 // Bases. 3629 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3630 E = ClassDecl->bases_end(); Base != E; ++Base) { 3631 // Bases are always records in a well-formed non-dependent class. 3632 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3633 3634 // Remember direct virtual bases. 3635 if (Base->isVirtual()) 3636 DirectVirtualBases.insert(RT); 3637 3638 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3639 // If our base class is invalid, we probably can't get its dtor anyway. 3640 if (BaseClassDecl->isInvalidDecl()) 3641 continue; 3642 if (BaseClassDecl->hasIrrelevantDestructor()) 3643 continue; 3644 3645 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3646 assert(Dtor && "No dtor found for BaseClassDecl!"); 3647 3648 // FIXME: caret should be on the start of the class name 3649 CheckDestructorAccess(Base->getLocStart(), Dtor, 3650 PDiag(diag::err_access_dtor_base) 3651 << Base->getType() 3652 << Base->getSourceRange(), 3653 Context.getTypeDeclType(ClassDecl)); 3654 3655 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3656 DiagnoseUseOfDecl(Dtor, Location); 3657 } 3658 3659 // Virtual bases. 3660 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3661 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3662 3663 // Bases are always records in a well-formed non-dependent class. 3664 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3665 3666 // Ignore direct virtual bases. 3667 if (DirectVirtualBases.count(RT)) 3668 continue; 3669 3670 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3671 // If our base class is invalid, we probably can't get its dtor anyway. 3672 if (BaseClassDecl->isInvalidDecl()) 3673 continue; 3674 if (BaseClassDecl->hasIrrelevantDestructor()) 3675 continue; 3676 3677 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3678 assert(Dtor && "No dtor found for BaseClassDecl!"); 3679 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3680 PDiag(diag::err_access_dtor_vbase) 3681 << VBase->getType(), 3682 Context.getTypeDeclType(ClassDecl)); 3683 3684 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3685 DiagnoseUseOfDecl(Dtor, Location); 3686 } 3687} 3688 3689void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3690 if (!CDtorDecl) 3691 return; 3692 3693 if (CXXConstructorDecl *Constructor 3694 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3695 SetCtorInitializers(Constructor, /*AnyErrors=*/false); 3696} 3697 3698bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3699 unsigned DiagID, AbstractDiagSelID SelID) { 3700 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3701 unsigned DiagID; 3702 AbstractDiagSelID SelID; 3703 3704 public: 3705 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3706 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3707 3708 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 3709 if (Suppressed) return; 3710 if (SelID == -1) 3711 S.Diag(Loc, DiagID) << T; 3712 else 3713 S.Diag(Loc, DiagID) << SelID << T; 3714 } 3715 } Diagnoser(DiagID, SelID); 3716 3717 return RequireNonAbstractType(Loc, T, Diagnoser); 3718} 3719 3720bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3721 TypeDiagnoser &Diagnoser) { 3722 if (!getLangOpts().CPlusPlus) 3723 return false; 3724 3725 if (const ArrayType *AT = Context.getAsArrayType(T)) 3726 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3727 3728 if (const PointerType *PT = T->getAs<PointerType>()) { 3729 // Find the innermost pointer type. 3730 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3731 PT = T; 3732 3733 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3734 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3735 } 3736 3737 const RecordType *RT = T->getAs<RecordType>(); 3738 if (!RT) 3739 return false; 3740 3741 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3742 3743 // We can't answer whether something is abstract until it has a 3744 // definition. If it's currently being defined, we'll walk back 3745 // over all the declarations when we have a full definition. 3746 const CXXRecordDecl *Def = RD->getDefinition(); 3747 if (!Def || Def->isBeingDefined()) 3748 return false; 3749 3750 if (!RD->isAbstract()) 3751 return false; 3752 3753 Diagnoser.diagnose(*this, Loc, T); 3754 DiagnoseAbstractType(RD); 3755 3756 return true; 3757} 3758 3759void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3760 // Check if we've already emitted the list of pure virtual functions 3761 // for this class. 3762 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3763 return; 3764 3765 CXXFinalOverriderMap FinalOverriders; 3766 RD->getFinalOverriders(FinalOverriders); 3767 3768 // Keep a set of seen pure methods so we won't diagnose the same method 3769 // more than once. 3770 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3771 3772 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3773 MEnd = FinalOverriders.end(); 3774 M != MEnd; 3775 ++M) { 3776 for (OverridingMethods::iterator SO = M->second.begin(), 3777 SOEnd = M->second.end(); 3778 SO != SOEnd; ++SO) { 3779 // C++ [class.abstract]p4: 3780 // A class is abstract if it contains or inherits at least one 3781 // pure virtual function for which the final overrider is pure 3782 // virtual. 3783 3784 // 3785 if (SO->second.size() != 1) 3786 continue; 3787 3788 if (!SO->second.front().Method->isPure()) 3789 continue; 3790 3791 if (!SeenPureMethods.insert(SO->second.front().Method)) 3792 continue; 3793 3794 Diag(SO->second.front().Method->getLocation(), 3795 diag::note_pure_virtual_function) 3796 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3797 } 3798 } 3799 3800 if (!PureVirtualClassDiagSet) 3801 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3802 PureVirtualClassDiagSet->insert(RD); 3803} 3804 3805namespace { 3806struct AbstractUsageInfo { 3807 Sema &S; 3808 CXXRecordDecl *Record; 3809 CanQualType AbstractType; 3810 bool Invalid; 3811 3812 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3813 : S(S), Record(Record), 3814 AbstractType(S.Context.getCanonicalType( 3815 S.Context.getTypeDeclType(Record))), 3816 Invalid(false) {} 3817 3818 void DiagnoseAbstractType() { 3819 if (Invalid) return; 3820 S.DiagnoseAbstractType(Record); 3821 Invalid = true; 3822 } 3823 3824 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3825}; 3826 3827struct CheckAbstractUsage { 3828 AbstractUsageInfo &Info; 3829 const NamedDecl *Ctx; 3830 3831 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3832 : Info(Info), Ctx(Ctx) {} 3833 3834 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3835 switch (TL.getTypeLocClass()) { 3836#define ABSTRACT_TYPELOC(CLASS, PARENT) 3837#define TYPELOC(CLASS, PARENT) \ 3838 case TypeLoc::CLASS: Check(TL.castAs<CLASS##TypeLoc>(), Sel); break; 3839#include "clang/AST/TypeLocNodes.def" 3840 } 3841 } 3842 3843 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3844 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3845 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3846 if (!TL.getArg(I)) 3847 continue; 3848 3849 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3850 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3851 } 3852 } 3853 3854 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3855 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3856 } 3857 3858 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3859 // Visit the type parameters from a permissive context. 3860 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3861 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3862 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3863 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3864 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3865 // TODO: other template argument types? 3866 } 3867 } 3868 3869 // Visit pointee types from a permissive context. 3870#define CheckPolymorphic(Type) \ 3871 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3872 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3873 } 3874 CheckPolymorphic(PointerTypeLoc) 3875 CheckPolymorphic(ReferenceTypeLoc) 3876 CheckPolymorphic(MemberPointerTypeLoc) 3877 CheckPolymorphic(BlockPointerTypeLoc) 3878 CheckPolymorphic(AtomicTypeLoc) 3879 3880 /// Handle all the types we haven't given a more specific 3881 /// implementation for above. 3882 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3883 // Every other kind of type that we haven't called out already 3884 // that has an inner type is either (1) sugar or (2) contains that 3885 // inner type in some way as a subobject. 3886 if (TypeLoc Next = TL.getNextTypeLoc()) 3887 return Visit(Next, Sel); 3888 3889 // If there's no inner type and we're in a permissive context, 3890 // don't diagnose. 3891 if (Sel == Sema::AbstractNone) return; 3892 3893 // Check whether the type matches the abstract type. 3894 QualType T = TL.getType(); 3895 if (T->isArrayType()) { 3896 Sel = Sema::AbstractArrayType; 3897 T = Info.S.Context.getBaseElementType(T); 3898 } 3899 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3900 if (CT != Info.AbstractType) return; 3901 3902 // It matched; do some magic. 3903 if (Sel == Sema::AbstractArrayType) { 3904 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3905 << T << TL.getSourceRange(); 3906 } else { 3907 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3908 << Sel << T << TL.getSourceRange(); 3909 } 3910 Info.DiagnoseAbstractType(); 3911 } 3912}; 3913 3914void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3915 Sema::AbstractDiagSelID Sel) { 3916 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3917} 3918 3919} 3920 3921/// Check for invalid uses of an abstract type in a method declaration. 3922static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3923 CXXMethodDecl *MD) { 3924 // No need to do the check on definitions, which require that 3925 // the return/param types be complete. 3926 if (MD->doesThisDeclarationHaveABody()) 3927 return; 3928 3929 // For safety's sake, just ignore it if we don't have type source 3930 // information. This should never happen for non-implicit methods, 3931 // but... 3932 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3933 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3934} 3935 3936/// Check for invalid uses of an abstract type within a class definition. 3937static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3938 CXXRecordDecl *RD) { 3939 for (CXXRecordDecl::decl_iterator 3940 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3941 Decl *D = *I; 3942 if (D->isImplicit()) continue; 3943 3944 // Methods and method templates. 3945 if (isa<CXXMethodDecl>(D)) { 3946 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3947 } else if (isa<FunctionTemplateDecl>(D)) { 3948 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3949 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3950 3951 // Fields and static variables. 3952 } else if (isa<FieldDecl>(D)) { 3953 FieldDecl *FD = cast<FieldDecl>(D); 3954 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3955 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3956 } else if (isa<VarDecl>(D)) { 3957 VarDecl *VD = cast<VarDecl>(D); 3958 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3959 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3960 3961 // Nested classes and class templates. 3962 } else if (isa<CXXRecordDecl>(D)) { 3963 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3964 } else if (isa<ClassTemplateDecl>(D)) { 3965 CheckAbstractClassUsage(Info, 3966 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3967 } 3968 } 3969} 3970 3971/// \brief Perform semantic checks on a class definition that has been 3972/// completing, introducing implicitly-declared members, checking for 3973/// abstract types, etc. 3974void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3975 if (!Record) 3976 return; 3977 3978 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3979 AbstractUsageInfo Info(*this, Record); 3980 CheckAbstractClassUsage(Info, Record); 3981 } 3982 3983 // If this is not an aggregate type and has no user-declared constructor, 3984 // complain about any non-static data members of reference or const scalar 3985 // type, since they will never get initializers. 3986 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3987 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3988 !Record->isLambda()) { 3989 bool Complained = false; 3990 for (RecordDecl::field_iterator F = Record->field_begin(), 3991 FEnd = Record->field_end(); 3992 F != FEnd; ++F) { 3993 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3994 continue; 3995 3996 if (F->getType()->isReferenceType() || 3997 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3998 if (!Complained) { 3999 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 4000 << Record->getTagKind() << Record; 4001 Complained = true; 4002 } 4003 4004 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 4005 << F->getType()->isReferenceType() 4006 << F->getDeclName(); 4007 } 4008 } 4009 } 4010 4011 if (Record->isDynamicClass() && !Record->isDependentType()) 4012 DynamicClasses.push_back(Record); 4013 4014 if (Record->getIdentifier()) { 4015 // C++ [class.mem]p13: 4016 // If T is the name of a class, then each of the following shall have a 4017 // name different from T: 4018 // - every member of every anonymous union that is a member of class T. 4019 // 4020 // C++ [class.mem]p14: 4021 // In addition, if class T has a user-declared constructor (12.1), every 4022 // non-static data member of class T shall have a name different from T. 4023 DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 4024 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 4025 ++I) { 4026 NamedDecl *D = *I; 4027 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 4028 isa<IndirectFieldDecl>(D)) { 4029 Diag(D->getLocation(), diag::err_member_name_of_class) 4030 << D->getDeclName(); 4031 break; 4032 } 4033 } 4034 } 4035 4036 // Warn if the class has virtual methods but non-virtual public destructor. 4037 if (Record->isPolymorphic() && !Record->isDependentType()) { 4038 CXXDestructorDecl *dtor = Record->getDestructor(); 4039 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 4040 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 4041 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 4042 } 4043 4044 if (Record->isAbstract() && Record->hasAttr<FinalAttr>()) { 4045 Diag(Record->getLocation(), diag::warn_abstract_final_class); 4046 DiagnoseAbstractType(Record); 4047 } 4048 4049 if (!Record->isDependentType()) { 4050 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 4051 MEnd = Record->method_end(); 4052 M != MEnd; ++M) { 4053 // See if a method overloads virtual methods in a base 4054 // class without overriding any. 4055 if (!M->isStatic()) 4056 DiagnoseHiddenVirtualMethods(Record, *M); 4057 4058 // Check whether the explicitly-defaulted special members are valid. 4059 if (!M->isInvalidDecl() && M->isExplicitlyDefaulted()) 4060 CheckExplicitlyDefaultedSpecialMember(*M); 4061 4062 // For an explicitly defaulted or deleted special member, we defer 4063 // determining triviality until the class is complete. That time is now! 4064 if (!M->isImplicit() && !M->isUserProvided()) { 4065 CXXSpecialMember CSM = getSpecialMember(*M); 4066 if (CSM != CXXInvalid) { 4067 M->setTrivial(SpecialMemberIsTrivial(*M, CSM)); 4068 4069 // Inform the class that we've finished declaring this member. 4070 Record->finishedDefaultedOrDeletedMember(*M); 4071 } 4072 } 4073 } 4074 } 4075 4076 // C++11 [dcl.constexpr]p8: A constexpr specifier for a non-static member 4077 // function that is not a constructor declares that member function to be 4078 // const. [...] The class of which that function is a member shall be 4079 // a literal type. 4080 // 4081 // If the class has virtual bases, any constexpr members will already have 4082 // been diagnosed by the checks performed on the member declaration, so 4083 // suppress this (less useful) diagnostic. 4084 // 4085 // We delay this until we know whether an explicitly-defaulted (or deleted) 4086 // destructor for the class is trivial. 4087 if (LangOpts.CPlusPlus11 && !Record->isDependentType() && 4088 !Record->isLiteral() && !Record->getNumVBases()) { 4089 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 4090 MEnd = Record->method_end(); 4091 M != MEnd; ++M) { 4092 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 4093 switch (Record->getTemplateSpecializationKind()) { 4094 case TSK_ImplicitInstantiation: 4095 case TSK_ExplicitInstantiationDeclaration: 4096 case TSK_ExplicitInstantiationDefinition: 4097 // If a template instantiates to a non-literal type, but its members 4098 // instantiate to constexpr functions, the template is technically 4099 // ill-formed, but we allow it for sanity. 4100 continue; 4101 4102 case TSK_Undeclared: 4103 case TSK_ExplicitSpecialization: 4104 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 4105 diag::err_constexpr_method_non_literal); 4106 break; 4107 } 4108 4109 // Only produce one error per class. 4110 break; 4111 } 4112 } 4113 } 4114 4115 // Declare inheriting constructors. We do this eagerly here because: 4116 // - The standard requires an eager diagnostic for conflicting inheriting 4117 // constructors from different classes. 4118 // - The lazy declaration of the other implicit constructors is so as to not 4119 // waste space and performance on classes that are not meant to be 4120 // instantiated (e.g. meta-functions). This doesn't apply to classes that 4121 // have inheriting constructors. 4122 DeclareInheritingConstructors(Record); 4123} 4124 4125/// Is the special member function which would be selected to perform the 4126/// specified operation on the specified class type a constexpr constructor? 4127static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4128 Sema::CXXSpecialMember CSM, 4129 bool ConstArg) { 4130 Sema::SpecialMemberOverloadResult *SMOR = 4131 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 4132 false, false, false, false); 4133 if (!SMOR || !SMOR->getMethod()) 4134 // A constructor we wouldn't select can't be "involved in initializing" 4135 // anything. 4136 return true; 4137 return SMOR->getMethod()->isConstexpr(); 4138} 4139 4140/// Determine whether the specified special member function would be constexpr 4141/// if it were implicitly defined. 4142static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4143 Sema::CXXSpecialMember CSM, 4144 bool ConstArg) { 4145 if (!S.getLangOpts().CPlusPlus11) 4146 return false; 4147 4148 // C++11 [dcl.constexpr]p4: 4149 // In the definition of a constexpr constructor [...] 4150 switch (CSM) { 4151 case Sema::CXXDefaultConstructor: 4152 // Since default constructor lookup is essentially trivial (and cannot 4153 // involve, for instance, template instantiation), we compute whether a 4154 // defaulted default constructor is constexpr directly within CXXRecordDecl. 4155 // 4156 // This is important for performance; we need to know whether the default 4157 // constructor is constexpr to determine whether the type is a literal type. 4158 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 4159 4160 case Sema::CXXCopyConstructor: 4161 case Sema::CXXMoveConstructor: 4162 // For copy or move constructors, we need to perform overload resolution. 4163 break; 4164 4165 case Sema::CXXCopyAssignment: 4166 case Sema::CXXMoveAssignment: 4167 case Sema::CXXDestructor: 4168 case Sema::CXXInvalid: 4169 return false; 4170 } 4171 4172 // -- if the class is a non-empty union, or for each non-empty anonymous 4173 // union member of a non-union class, exactly one non-static data member 4174 // shall be initialized; [DR1359] 4175 // 4176 // If we squint, this is guaranteed, since exactly one non-static data member 4177 // will be initialized (if the constructor isn't deleted), we just don't know 4178 // which one. 4179 if (ClassDecl->isUnion()) 4180 return true; 4181 4182 // -- the class shall not have any virtual base classes; 4183 if (ClassDecl->getNumVBases()) 4184 return false; 4185 4186 // -- every constructor involved in initializing [...] base class 4187 // sub-objects shall be a constexpr constructor; 4188 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4189 BEnd = ClassDecl->bases_end(); 4190 B != BEnd; ++B) { 4191 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 4192 if (!BaseType) continue; 4193 4194 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4195 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 4196 return false; 4197 } 4198 4199 // -- every constructor involved in initializing non-static data members 4200 // [...] shall be a constexpr constructor; 4201 // -- every non-static data member and base class sub-object shall be 4202 // initialized 4203 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4204 FEnd = ClassDecl->field_end(); 4205 F != FEnd; ++F) { 4206 if (F->isInvalidDecl()) 4207 continue; 4208 if (const RecordType *RecordTy = 4209 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4210 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4211 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 4212 return false; 4213 } 4214 } 4215 4216 // All OK, it's constexpr! 4217 return true; 4218} 4219 4220static Sema::ImplicitExceptionSpecification 4221computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 4222 switch (S.getSpecialMember(MD)) { 4223 case Sema::CXXDefaultConstructor: 4224 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 4225 case Sema::CXXCopyConstructor: 4226 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 4227 case Sema::CXXCopyAssignment: 4228 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 4229 case Sema::CXXMoveConstructor: 4230 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 4231 case Sema::CXXMoveAssignment: 4232 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 4233 case Sema::CXXDestructor: 4234 return S.ComputeDefaultedDtorExceptionSpec(MD); 4235 case Sema::CXXInvalid: 4236 break; 4237 } 4238 assert(cast<CXXConstructorDecl>(MD)->getInheritedConstructor() && 4239 "only special members have implicit exception specs"); 4240 return S.ComputeInheritingCtorExceptionSpec(cast<CXXConstructorDecl>(MD)); 4241} 4242 4243static void 4244updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4245 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4246 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4247 ExceptSpec.getEPI(EPI); 4248 FD->setType(S.Context.getFunctionType(FPT->getResultType(), 4249 FPT->getArgTypes(), EPI)); 4250} 4251 4252void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4253 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4254 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4255 return; 4256 4257 // Evaluate the exception specification. 4258 ImplicitExceptionSpecification ExceptSpec = 4259 computeImplicitExceptionSpec(*this, Loc, MD); 4260 4261 // Update the type of the special member to use it. 4262 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4263 4264 // A user-provided destructor can be defined outside the class. When that 4265 // happens, be sure to update the exception specification on both 4266 // declarations. 4267 const FunctionProtoType *CanonicalFPT = 4268 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4269 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4270 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4271 CanonicalFPT, ExceptSpec); 4272} 4273 4274void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4275 CXXRecordDecl *RD = MD->getParent(); 4276 CXXSpecialMember CSM = getSpecialMember(MD); 4277 4278 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4279 "not an explicitly-defaulted special member"); 4280 4281 // Whether this was the first-declared instance of the constructor. 4282 // This affects whether we implicitly add an exception spec and constexpr. 4283 bool First = MD == MD->getCanonicalDecl(); 4284 4285 bool HadError = false; 4286 4287 // C++11 [dcl.fct.def.default]p1: 4288 // A function that is explicitly defaulted shall 4289 // -- be a special member function (checked elsewhere), 4290 // -- have the same type (except for ref-qualifiers, and except that a 4291 // copy operation can take a non-const reference) as an implicit 4292 // declaration, and 4293 // -- not have default arguments. 4294 unsigned ExpectedParams = 1; 4295 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4296 ExpectedParams = 0; 4297 if (MD->getNumParams() != ExpectedParams) { 4298 // This also checks for default arguments: a copy or move constructor with a 4299 // default argument is classified as a default constructor, and assignment 4300 // operations and destructors can't have default arguments. 4301 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4302 << CSM << MD->getSourceRange(); 4303 HadError = true; 4304 } else if (MD->isVariadic()) { 4305 Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic) 4306 << CSM << MD->getSourceRange(); 4307 HadError = true; 4308 } 4309 4310 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4311 4312 bool CanHaveConstParam = false; 4313 if (CSM == CXXCopyConstructor) 4314 CanHaveConstParam = RD->implicitCopyConstructorHasConstParam(); 4315 else if (CSM == CXXCopyAssignment) 4316 CanHaveConstParam = RD->implicitCopyAssignmentHasConstParam(); 4317 4318 QualType ReturnType = Context.VoidTy; 4319 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4320 // Check for return type matching. 4321 ReturnType = Type->getResultType(); 4322 QualType ExpectedReturnType = 4323 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4324 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4325 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4326 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4327 HadError = true; 4328 } 4329 4330 // A defaulted special member cannot have cv-qualifiers. 4331 if (Type->getTypeQuals()) { 4332 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4333 << (CSM == CXXMoveAssignment); 4334 HadError = true; 4335 } 4336 } 4337 4338 // Check for parameter type matching. 4339 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4340 bool HasConstParam = false; 4341 if (ExpectedParams && ArgType->isReferenceType()) { 4342 // Argument must be reference to possibly-const T. 4343 QualType ReferentType = ArgType->getPointeeType(); 4344 HasConstParam = ReferentType.isConstQualified(); 4345 4346 if (ReferentType.isVolatileQualified()) { 4347 Diag(MD->getLocation(), 4348 diag::err_defaulted_special_member_volatile_param) << CSM; 4349 HadError = true; 4350 } 4351 4352 if (HasConstParam && !CanHaveConstParam) { 4353 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4354 Diag(MD->getLocation(), 4355 diag::err_defaulted_special_member_copy_const_param) 4356 << (CSM == CXXCopyAssignment); 4357 // FIXME: Explain why this special member can't be const. 4358 } else { 4359 Diag(MD->getLocation(), 4360 diag::err_defaulted_special_member_move_const_param) 4361 << (CSM == CXXMoveAssignment); 4362 } 4363 HadError = true; 4364 } 4365 } else if (ExpectedParams) { 4366 // A copy assignment operator can take its argument by value, but a 4367 // defaulted one cannot. 4368 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4369 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4370 HadError = true; 4371 } 4372 4373 // C++11 [dcl.fct.def.default]p2: 4374 // An explicitly-defaulted function may be declared constexpr only if it 4375 // would have been implicitly declared as constexpr, 4376 // Do not apply this rule to members of class templates, since core issue 1358 4377 // makes such functions always instantiate to constexpr functions. For 4378 // non-constructors, this is checked elsewhere. 4379 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4380 HasConstParam); 4381 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr && 4382 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4383 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4384 // FIXME: Explain why the constructor can't be constexpr. 4385 HadError = true; 4386 } 4387 4388 // and may have an explicit exception-specification only if it is compatible 4389 // with the exception-specification on the implicit declaration. 4390 if (Type->hasExceptionSpec()) { 4391 // Delay the check if this is the first declaration of the special member, 4392 // since we may not have parsed some necessary in-class initializers yet. 4393 if (First) { 4394 // If the exception specification needs to be instantiated, do so now, 4395 // before we clobber it with an EST_Unevaluated specification below. 4396 if (Type->getExceptionSpecType() == EST_Uninstantiated) { 4397 InstantiateExceptionSpec(MD->getLocStart(), MD); 4398 Type = MD->getType()->getAs<FunctionProtoType>(); 4399 } 4400 DelayedDefaultedMemberExceptionSpecs.push_back(std::make_pair(MD, Type)); 4401 } else 4402 CheckExplicitlyDefaultedMemberExceptionSpec(MD, Type); 4403 } 4404 4405 // If a function is explicitly defaulted on its first declaration, 4406 if (First) { 4407 // -- it is implicitly considered to be constexpr if the implicit 4408 // definition would be, 4409 MD->setConstexpr(Constexpr); 4410 4411 // -- it is implicitly considered to have the same exception-specification 4412 // as if it had been implicitly declared, 4413 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4414 EPI.ExceptionSpecType = EST_Unevaluated; 4415 EPI.ExceptionSpecDecl = MD; 4416 MD->setType(Context.getFunctionType(ReturnType, 4417 ArrayRef<QualType>(&ArgType, 4418 ExpectedParams), 4419 EPI)); 4420 } 4421 4422 if (ShouldDeleteSpecialMember(MD, CSM)) { 4423 if (First) { 4424 SetDeclDeleted(MD, MD->getLocation()); 4425 } else { 4426 // C++11 [dcl.fct.def.default]p4: 4427 // [For a] user-provided explicitly-defaulted function [...] if such a 4428 // function is implicitly defined as deleted, the program is ill-formed. 4429 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4430 HadError = true; 4431 } 4432 } 4433 4434 if (HadError) 4435 MD->setInvalidDecl(); 4436} 4437 4438/// Check whether the exception specification provided for an 4439/// explicitly-defaulted special member matches the exception specification 4440/// that would have been generated for an implicit special member, per 4441/// C++11 [dcl.fct.def.default]p2. 4442void Sema::CheckExplicitlyDefaultedMemberExceptionSpec( 4443 CXXMethodDecl *MD, const FunctionProtoType *SpecifiedType) { 4444 // Compute the implicit exception specification. 4445 FunctionProtoType::ExtProtoInfo EPI; 4446 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4447 const FunctionProtoType *ImplicitType = cast<FunctionProtoType>( 4448 Context.getFunctionType(Context.VoidTy, ArrayRef<QualType>(), EPI)); 4449 4450 // Ensure that it matches. 4451 CheckEquivalentExceptionSpec( 4452 PDiag(diag::err_incorrect_defaulted_exception_spec) 4453 << getSpecialMember(MD), PDiag(), 4454 ImplicitType, SourceLocation(), 4455 SpecifiedType, MD->getLocation()); 4456} 4457 4458void Sema::CheckDelayedExplicitlyDefaultedMemberExceptionSpecs() { 4459 for (unsigned I = 0, N = DelayedDefaultedMemberExceptionSpecs.size(); 4460 I != N; ++I) 4461 CheckExplicitlyDefaultedMemberExceptionSpec( 4462 DelayedDefaultedMemberExceptionSpecs[I].first, 4463 DelayedDefaultedMemberExceptionSpecs[I].second); 4464 4465 DelayedDefaultedMemberExceptionSpecs.clear(); 4466} 4467 4468namespace { 4469struct SpecialMemberDeletionInfo { 4470 Sema &S; 4471 CXXMethodDecl *MD; 4472 Sema::CXXSpecialMember CSM; 4473 bool Diagnose; 4474 4475 // Properties of the special member, computed for convenience. 4476 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4477 SourceLocation Loc; 4478 4479 bool AllFieldsAreConst; 4480 4481 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4482 Sema::CXXSpecialMember CSM, bool Diagnose) 4483 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4484 IsConstructor(false), IsAssignment(false), IsMove(false), 4485 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4486 AllFieldsAreConst(true) { 4487 switch (CSM) { 4488 case Sema::CXXDefaultConstructor: 4489 case Sema::CXXCopyConstructor: 4490 IsConstructor = true; 4491 break; 4492 case Sema::CXXMoveConstructor: 4493 IsConstructor = true; 4494 IsMove = true; 4495 break; 4496 case Sema::CXXCopyAssignment: 4497 IsAssignment = true; 4498 break; 4499 case Sema::CXXMoveAssignment: 4500 IsAssignment = true; 4501 IsMove = true; 4502 break; 4503 case Sema::CXXDestructor: 4504 break; 4505 case Sema::CXXInvalid: 4506 llvm_unreachable("invalid special member kind"); 4507 } 4508 4509 if (MD->getNumParams()) { 4510 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4511 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4512 } 4513 } 4514 4515 bool inUnion() const { return MD->getParent()->isUnion(); } 4516 4517 /// Look up the corresponding special member in the given class. 4518 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4519 unsigned Quals) { 4520 unsigned TQ = MD->getTypeQualifiers(); 4521 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4522 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4523 Quals = 0; 4524 return S.LookupSpecialMember(Class, CSM, 4525 ConstArg || (Quals & Qualifiers::Const), 4526 VolatileArg || (Quals & Qualifiers::Volatile), 4527 MD->getRefQualifier() == RQ_RValue, 4528 TQ & Qualifiers::Const, 4529 TQ & Qualifiers::Volatile); 4530 } 4531 4532 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4533 4534 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4535 bool shouldDeleteForField(FieldDecl *FD); 4536 bool shouldDeleteForAllConstMembers(); 4537 4538 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4539 unsigned Quals); 4540 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4541 Sema::SpecialMemberOverloadResult *SMOR, 4542 bool IsDtorCallInCtor); 4543 4544 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4545}; 4546} 4547 4548/// Is the given special member inaccessible when used on the given 4549/// sub-object. 4550bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4551 CXXMethodDecl *target) { 4552 /// If we're operating on a base class, the object type is the 4553 /// type of this special member. 4554 QualType objectTy; 4555 AccessSpecifier access = target->getAccess(); 4556 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4557 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4558 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4559 4560 // If we're operating on a field, the object type is the type of the field. 4561 } else { 4562 objectTy = S.Context.getTypeDeclType(target->getParent()); 4563 } 4564 4565 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4566} 4567 4568/// Check whether we should delete a special member due to the implicit 4569/// definition containing a call to a special member of a subobject. 4570bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4571 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4572 bool IsDtorCallInCtor) { 4573 CXXMethodDecl *Decl = SMOR->getMethod(); 4574 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4575 4576 int DiagKind = -1; 4577 4578 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4579 DiagKind = !Decl ? 0 : 1; 4580 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4581 DiagKind = 2; 4582 else if (!isAccessible(Subobj, Decl)) 4583 DiagKind = 3; 4584 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4585 !Decl->isTrivial()) { 4586 // A member of a union must have a trivial corresponding special member. 4587 // As a weird special case, a destructor call from a union's constructor 4588 // must be accessible and non-deleted, but need not be trivial. Such a 4589 // destructor is never actually called, but is semantically checked as 4590 // if it were. 4591 DiagKind = 4; 4592 } 4593 4594 if (DiagKind == -1) 4595 return false; 4596 4597 if (Diagnose) { 4598 if (Field) { 4599 S.Diag(Field->getLocation(), 4600 diag::note_deleted_special_member_class_subobject) 4601 << CSM << MD->getParent() << /*IsField*/true 4602 << Field << DiagKind << IsDtorCallInCtor; 4603 } else { 4604 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4605 S.Diag(Base->getLocStart(), 4606 diag::note_deleted_special_member_class_subobject) 4607 << CSM << MD->getParent() << /*IsField*/false 4608 << Base->getType() << DiagKind << IsDtorCallInCtor; 4609 } 4610 4611 if (DiagKind == 1) 4612 S.NoteDeletedFunction(Decl); 4613 // FIXME: Explain inaccessibility if DiagKind == 3. 4614 } 4615 4616 return true; 4617} 4618 4619/// Check whether we should delete a special member function due to having a 4620/// direct or virtual base class or non-static data member of class type M. 4621bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4622 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 4623 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4624 4625 // C++11 [class.ctor]p5: 4626 // -- any direct or virtual base class, or non-static data member with no 4627 // brace-or-equal-initializer, has class type M (or array thereof) and 4628 // either M has no default constructor or overload resolution as applied 4629 // to M's default constructor results in an ambiguity or in a function 4630 // that is deleted or inaccessible 4631 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4632 // -- a direct or virtual base class B that cannot be copied/moved because 4633 // overload resolution, as applied to B's corresponding special member, 4634 // results in an ambiguity or a function that is deleted or inaccessible 4635 // from the defaulted special member 4636 // C++11 [class.dtor]p5: 4637 // -- any direct or virtual base class [...] has a type with a destructor 4638 // that is deleted or inaccessible 4639 if (!(CSM == Sema::CXXDefaultConstructor && 4640 Field && Field->hasInClassInitializer()) && 4641 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 4642 return true; 4643 4644 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4645 // -- any direct or virtual base class or non-static data member has a 4646 // type with a destructor that is deleted or inaccessible 4647 if (IsConstructor) { 4648 Sema::SpecialMemberOverloadResult *SMOR = 4649 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4650 false, false, false, false, false); 4651 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4652 return true; 4653 } 4654 4655 return false; 4656} 4657 4658/// Check whether we should delete a special member function due to the class 4659/// having a particular direct or virtual base class. 4660bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4661 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4662 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 4663} 4664 4665/// Check whether we should delete a special member function due to the class 4666/// having a particular non-static data member. 4667bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4668 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4669 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4670 4671 if (CSM == Sema::CXXDefaultConstructor) { 4672 // For a default constructor, all references must be initialized in-class 4673 // and, if a union, it must have a non-const member. 4674 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4675 if (Diagnose) 4676 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4677 << MD->getParent() << FD << FieldType << /*Reference*/0; 4678 return true; 4679 } 4680 // C++11 [class.ctor]p5: any non-variant non-static data member of 4681 // const-qualified type (or array thereof) with no 4682 // brace-or-equal-initializer does not have a user-provided default 4683 // constructor. 4684 if (!inUnion() && FieldType.isConstQualified() && 4685 !FD->hasInClassInitializer() && 4686 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4687 if (Diagnose) 4688 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4689 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4690 return true; 4691 } 4692 4693 if (inUnion() && !FieldType.isConstQualified()) 4694 AllFieldsAreConst = false; 4695 } else if (CSM == Sema::CXXCopyConstructor) { 4696 // For a copy constructor, data members must not be of rvalue reference 4697 // type. 4698 if (FieldType->isRValueReferenceType()) { 4699 if (Diagnose) 4700 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4701 << MD->getParent() << FD << FieldType; 4702 return true; 4703 } 4704 } else if (IsAssignment) { 4705 // For an assignment operator, data members must not be of reference type. 4706 if (FieldType->isReferenceType()) { 4707 if (Diagnose) 4708 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4709 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4710 return true; 4711 } 4712 if (!FieldRecord && FieldType.isConstQualified()) { 4713 // C++11 [class.copy]p23: 4714 // -- a non-static data member of const non-class type (or array thereof) 4715 if (Diagnose) 4716 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4717 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4718 return true; 4719 } 4720 } 4721 4722 if (FieldRecord) { 4723 // Some additional restrictions exist on the variant members. 4724 if (!inUnion() && FieldRecord->isUnion() && 4725 FieldRecord->isAnonymousStructOrUnion()) { 4726 bool AllVariantFieldsAreConst = true; 4727 4728 // FIXME: Handle anonymous unions declared within anonymous unions. 4729 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4730 UE = FieldRecord->field_end(); 4731 UI != UE; ++UI) { 4732 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4733 4734 if (!UnionFieldType.isConstQualified()) 4735 AllVariantFieldsAreConst = false; 4736 4737 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4738 if (UnionFieldRecord && 4739 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 4740 UnionFieldType.getCVRQualifiers())) 4741 return true; 4742 } 4743 4744 // At least one member in each anonymous union must be non-const 4745 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4746 FieldRecord->field_begin() != FieldRecord->field_end()) { 4747 if (Diagnose) 4748 S.Diag(FieldRecord->getLocation(), 4749 diag::note_deleted_default_ctor_all_const) 4750 << MD->getParent() << /*anonymous union*/1; 4751 return true; 4752 } 4753 4754 // Don't check the implicit member of the anonymous union type. 4755 // This is technically non-conformant, but sanity demands it. 4756 return false; 4757 } 4758 4759 if (shouldDeleteForClassSubobject(FieldRecord, FD, 4760 FieldType.getCVRQualifiers())) 4761 return true; 4762 } 4763 4764 return false; 4765} 4766 4767/// C++11 [class.ctor] p5: 4768/// A defaulted default constructor for a class X is defined as deleted if 4769/// X is a union and all of its variant members are of const-qualified type. 4770bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4771 // This is a silly definition, because it gives an empty union a deleted 4772 // default constructor. Don't do that. 4773 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4774 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4775 if (Diagnose) 4776 S.Diag(MD->getParent()->getLocation(), 4777 diag::note_deleted_default_ctor_all_const) 4778 << MD->getParent() << /*not anonymous union*/0; 4779 return true; 4780 } 4781 return false; 4782} 4783 4784/// Determine whether a defaulted special member function should be defined as 4785/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4786/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4787bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4788 bool Diagnose) { 4789 if (MD->isInvalidDecl()) 4790 return false; 4791 CXXRecordDecl *RD = MD->getParent(); 4792 assert(!RD->isDependentType() && "do deletion after instantiation"); 4793 if (!LangOpts.CPlusPlus11 || RD->isInvalidDecl()) 4794 return false; 4795 4796 // C++11 [expr.lambda.prim]p19: 4797 // The closure type associated with a lambda-expression has a 4798 // deleted (8.4.3) default constructor and a deleted copy 4799 // assignment operator. 4800 if (RD->isLambda() && 4801 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4802 if (Diagnose) 4803 Diag(RD->getLocation(), diag::note_lambda_decl); 4804 return true; 4805 } 4806 4807 // For an anonymous struct or union, the copy and assignment special members 4808 // will never be used, so skip the check. For an anonymous union declared at 4809 // namespace scope, the constructor and destructor are used. 4810 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4811 RD->isAnonymousStructOrUnion()) 4812 return false; 4813 4814 // C++11 [class.copy]p7, p18: 4815 // If the class definition declares a move constructor or move assignment 4816 // operator, an implicitly declared copy constructor or copy assignment 4817 // operator is defined as deleted. 4818 if (MD->isImplicit() && 4819 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4820 CXXMethodDecl *UserDeclaredMove = 0; 4821 4822 // In Microsoft mode, a user-declared move only causes the deletion of the 4823 // corresponding copy operation, not both copy operations. 4824 if (RD->hasUserDeclaredMoveConstructor() && 4825 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4826 if (!Diagnose) return true; 4827 4828 // Find any user-declared move constructor. 4829 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(), 4830 E = RD->ctor_end(); I != E; ++I) { 4831 if (I->isMoveConstructor()) { 4832 UserDeclaredMove = *I; 4833 break; 4834 } 4835 } 4836 assert(UserDeclaredMove); 4837 } else if (RD->hasUserDeclaredMoveAssignment() && 4838 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4839 if (!Diagnose) return true; 4840 4841 // Find any user-declared move assignment operator. 4842 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 4843 E = RD->method_end(); I != E; ++I) { 4844 if (I->isMoveAssignmentOperator()) { 4845 UserDeclaredMove = *I; 4846 break; 4847 } 4848 } 4849 assert(UserDeclaredMove); 4850 } 4851 4852 if (UserDeclaredMove) { 4853 Diag(UserDeclaredMove->getLocation(), 4854 diag::note_deleted_copy_user_declared_move) 4855 << (CSM == CXXCopyAssignment) << RD 4856 << UserDeclaredMove->isMoveAssignmentOperator(); 4857 return true; 4858 } 4859 } 4860 4861 // Do access control from the special member function 4862 ContextRAII MethodContext(*this, MD); 4863 4864 // C++11 [class.dtor]p5: 4865 // -- for a virtual destructor, lookup of the non-array deallocation function 4866 // results in an ambiguity or in a function that is deleted or inaccessible 4867 if (CSM == CXXDestructor && MD->isVirtual()) { 4868 FunctionDecl *OperatorDelete = 0; 4869 DeclarationName Name = 4870 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4871 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4872 OperatorDelete, false)) { 4873 if (Diagnose) 4874 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4875 return true; 4876 } 4877 } 4878 4879 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4880 4881 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4882 BE = RD->bases_end(); BI != BE; ++BI) 4883 if (!BI->isVirtual() && 4884 SMI.shouldDeleteForBase(BI)) 4885 return true; 4886 4887 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4888 BE = RD->vbases_end(); BI != BE; ++BI) 4889 if (SMI.shouldDeleteForBase(BI)) 4890 return true; 4891 4892 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4893 FE = RD->field_end(); FI != FE; ++FI) 4894 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4895 SMI.shouldDeleteForField(*FI)) 4896 return true; 4897 4898 if (SMI.shouldDeleteForAllConstMembers()) 4899 return true; 4900 4901 return false; 4902} 4903 4904/// Perform lookup for a special member of the specified kind, and determine 4905/// whether it is trivial. If the triviality can be determined without the 4906/// lookup, skip it. This is intended for use when determining whether a 4907/// special member of a containing object is trivial, and thus does not ever 4908/// perform overload resolution for default constructors. 4909/// 4910/// If \p Selected is not \c NULL, \c *Selected will be filled in with the 4911/// member that was most likely to be intended to be trivial, if any. 4912static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD, 4913 Sema::CXXSpecialMember CSM, unsigned Quals, 4914 CXXMethodDecl **Selected) { 4915 if (Selected) 4916 *Selected = 0; 4917 4918 switch (CSM) { 4919 case Sema::CXXInvalid: 4920 llvm_unreachable("not a special member"); 4921 4922 case Sema::CXXDefaultConstructor: 4923 // C++11 [class.ctor]p5: 4924 // A default constructor is trivial if: 4925 // - all the [direct subobjects] have trivial default constructors 4926 // 4927 // Note, no overload resolution is performed in this case. 4928 if (RD->hasTrivialDefaultConstructor()) 4929 return true; 4930 4931 if (Selected) { 4932 // If there's a default constructor which could have been trivial, dig it 4933 // out. Otherwise, if there's any user-provided default constructor, point 4934 // to that as an example of why there's not a trivial one. 4935 CXXConstructorDecl *DefCtor = 0; 4936 if (RD->needsImplicitDefaultConstructor()) 4937 S.DeclareImplicitDefaultConstructor(RD); 4938 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), 4939 CE = RD->ctor_end(); CI != CE; ++CI) { 4940 if (!CI->isDefaultConstructor()) 4941 continue; 4942 DefCtor = *CI; 4943 if (!DefCtor->isUserProvided()) 4944 break; 4945 } 4946 4947 *Selected = DefCtor; 4948 } 4949 4950 return false; 4951 4952 case Sema::CXXDestructor: 4953 // C++11 [class.dtor]p5: 4954 // A destructor is trivial if: 4955 // - all the direct [subobjects] have trivial destructors 4956 if (RD->hasTrivialDestructor()) 4957 return true; 4958 4959 if (Selected) { 4960 if (RD->needsImplicitDestructor()) 4961 S.DeclareImplicitDestructor(RD); 4962 *Selected = RD->getDestructor(); 4963 } 4964 4965 return false; 4966 4967 case Sema::CXXCopyConstructor: 4968 // C++11 [class.copy]p12: 4969 // A copy constructor is trivial if: 4970 // - the constructor selected to copy each direct [subobject] is trivial 4971 if (RD->hasTrivialCopyConstructor()) { 4972 if (Quals == Qualifiers::Const) 4973 // We must either select the trivial copy constructor or reach an 4974 // ambiguity; no need to actually perform overload resolution. 4975 return true; 4976 } else if (!Selected) { 4977 return false; 4978 } 4979 // In C++98, we are not supposed to perform overload resolution here, but we 4980 // treat that as a language defect, as suggested on cxx-abi-dev, to treat 4981 // cases like B as having a non-trivial copy constructor: 4982 // struct A { template<typename T> A(T&); }; 4983 // struct B { mutable A a; }; 4984 goto NeedOverloadResolution; 4985 4986 case Sema::CXXCopyAssignment: 4987 // C++11 [class.copy]p25: 4988 // A copy assignment operator is trivial if: 4989 // - the assignment operator selected to copy each direct [subobject] is 4990 // trivial 4991 if (RD->hasTrivialCopyAssignment()) { 4992 if (Quals == Qualifiers::Const) 4993 return true; 4994 } else if (!Selected) { 4995 return false; 4996 } 4997 // In C++98, we are not supposed to perform overload resolution here, but we 4998 // treat that as a language defect. 4999 goto NeedOverloadResolution; 5000 5001 case Sema::CXXMoveConstructor: 5002 case Sema::CXXMoveAssignment: 5003 NeedOverloadResolution: 5004 Sema::SpecialMemberOverloadResult *SMOR = 5005 S.LookupSpecialMember(RD, CSM, 5006 Quals & Qualifiers::Const, 5007 Quals & Qualifiers::Volatile, 5008 /*RValueThis*/false, /*ConstThis*/false, 5009 /*VolatileThis*/false); 5010 5011 // The standard doesn't describe how to behave if the lookup is ambiguous. 5012 // We treat it as not making the member non-trivial, just like the standard 5013 // mandates for the default constructor. This should rarely matter, because 5014 // the member will also be deleted. 5015 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 5016 return true; 5017 5018 if (!SMOR->getMethod()) { 5019 assert(SMOR->getKind() == 5020 Sema::SpecialMemberOverloadResult::NoMemberOrDeleted); 5021 return false; 5022 } 5023 5024 // We deliberately don't check if we found a deleted special member. We're 5025 // not supposed to! 5026 if (Selected) 5027 *Selected = SMOR->getMethod(); 5028 return SMOR->getMethod()->isTrivial(); 5029 } 5030 5031 llvm_unreachable("unknown special method kind"); 5032} 5033 5034static CXXConstructorDecl *findUserDeclaredCtor(CXXRecordDecl *RD) { 5035 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), CE = RD->ctor_end(); 5036 CI != CE; ++CI) 5037 if (!CI->isImplicit()) 5038 return *CI; 5039 5040 // Look for constructor templates. 5041 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> tmpl_iter; 5042 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); TI != TE; ++TI) { 5043 if (CXXConstructorDecl *CD = 5044 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl())) 5045 return CD; 5046 } 5047 5048 return 0; 5049} 5050 5051/// The kind of subobject we are checking for triviality. The values of this 5052/// enumeration are used in diagnostics. 5053enum TrivialSubobjectKind { 5054 /// The subobject is a base class. 5055 TSK_BaseClass, 5056 /// The subobject is a non-static data member. 5057 TSK_Field, 5058 /// The object is actually the complete object. 5059 TSK_CompleteObject 5060}; 5061 5062/// Check whether the special member selected for a given type would be trivial. 5063static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc, 5064 QualType SubType, 5065 Sema::CXXSpecialMember CSM, 5066 TrivialSubobjectKind Kind, 5067 bool Diagnose) { 5068 CXXRecordDecl *SubRD = SubType->getAsCXXRecordDecl(); 5069 if (!SubRD) 5070 return true; 5071 5072 CXXMethodDecl *Selected; 5073 if (findTrivialSpecialMember(S, SubRD, CSM, SubType.getCVRQualifiers(), 5074 Diagnose ? &Selected : 0)) 5075 return true; 5076 5077 if (Diagnose) { 5078 if (!Selected && CSM == Sema::CXXDefaultConstructor) { 5079 S.Diag(SubobjLoc, diag::note_nontrivial_no_def_ctor) 5080 << Kind << SubType.getUnqualifiedType(); 5081 if (CXXConstructorDecl *CD = findUserDeclaredCtor(SubRD)) 5082 S.Diag(CD->getLocation(), diag::note_user_declared_ctor); 5083 } else if (!Selected) 5084 S.Diag(SubobjLoc, diag::note_nontrivial_no_copy) 5085 << Kind << SubType.getUnqualifiedType() << CSM << SubType; 5086 else if (Selected->isUserProvided()) { 5087 if (Kind == TSK_CompleteObject) 5088 S.Diag(Selected->getLocation(), diag::note_nontrivial_user_provided) 5089 << Kind << SubType.getUnqualifiedType() << CSM; 5090 else { 5091 S.Diag(SubobjLoc, diag::note_nontrivial_user_provided) 5092 << Kind << SubType.getUnqualifiedType() << CSM; 5093 S.Diag(Selected->getLocation(), diag::note_declared_at); 5094 } 5095 } else { 5096 if (Kind != TSK_CompleteObject) 5097 S.Diag(SubobjLoc, diag::note_nontrivial_subobject) 5098 << Kind << SubType.getUnqualifiedType() << CSM; 5099 5100 // Explain why the defaulted or deleted special member isn't trivial. 5101 S.SpecialMemberIsTrivial(Selected, CSM, Diagnose); 5102 } 5103 } 5104 5105 return false; 5106} 5107 5108/// Check whether the members of a class type allow a special member to be 5109/// trivial. 5110static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD, 5111 Sema::CXXSpecialMember CSM, 5112 bool ConstArg, bool Diagnose) { 5113 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 5114 FE = RD->field_end(); FI != FE; ++FI) { 5115 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 5116 continue; 5117 5118 QualType FieldType = S.Context.getBaseElementType(FI->getType()); 5119 5120 // Pretend anonymous struct or union members are members of this class. 5121 if (FI->isAnonymousStructOrUnion()) { 5122 if (!checkTrivialClassMembers(S, FieldType->getAsCXXRecordDecl(), 5123 CSM, ConstArg, Diagnose)) 5124 return false; 5125 continue; 5126 } 5127 5128 // C++11 [class.ctor]p5: 5129 // A default constructor is trivial if [...] 5130 // -- no non-static data member of its class has a 5131 // brace-or-equal-initializer 5132 if (CSM == Sema::CXXDefaultConstructor && FI->hasInClassInitializer()) { 5133 if (Diagnose) 5134 S.Diag(FI->getLocation(), diag::note_nontrivial_in_class_init) << *FI; 5135 return false; 5136 } 5137 5138 // Objective C ARC 4.3.5: 5139 // [...] nontrivally ownership-qualified types are [...] not trivially 5140 // default constructible, copy constructible, move constructible, copy 5141 // assignable, move assignable, or destructible [...] 5142 if (S.getLangOpts().ObjCAutoRefCount && 5143 FieldType.hasNonTrivialObjCLifetime()) { 5144 if (Diagnose) 5145 S.Diag(FI->getLocation(), diag::note_nontrivial_objc_ownership) 5146 << RD << FieldType.getObjCLifetime(); 5147 return false; 5148 } 5149 5150 if (ConstArg && !FI->isMutable()) 5151 FieldType.addConst(); 5152 if (!checkTrivialSubobjectCall(S, FI->getLocation(), FieldType, CSM, 5153 TSK_Field, Diagnose)) 5154 return false; 5155 } 5156 5157 return true; 5158} 5159 5160/// Diagnose why the specified class does not have a trivial special member of 5161/// the given kind. 5162void Sema::DiagnoseNontrivial(const CXXRecordDecl *RD, CXXSpecialMember CSM) { 5163 QualType Ty = Context.getRecordType(RD); 5164 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) 5165 Ty.addConst(); 5166 5167 checkTrivialSubobjectCall(*this, RD->getLocation(), Ty, CSM, 5168 TSK_CompleteObject, /*Diagnose*/true); 5169} 5170 5171/// Determine whether a defaulted or deleted special member function is trivial, 5172/// as specified in C++11 [class.ctor]p5, C++11 [class.copy]p12, 5173/// C++11 [class.copy]p25, and C++11 [class.dtor]p5. 5174bool Sema::SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM, 5175 bool Diagnose) { 5176 assert(!MD->isUserProvided() && CSM != CXXInvalid && "not special enough"); 5177 5178 CXXRecordDecl *RD = MD->getParent(); 5179 5180 bool ConstArg = false; 5181 5182 // C++11 [class.copy]p12, p25: 5183 // A [special member] is trivial if its declared parameter type is the same 5184 // as if it had been implicitly declared [...] 5185 switch (CSM) { 5186 case CXXDefaultConstructor: 5187 case CXXDestructor: 5188 // Trivial default constructors and destructors cannot have parameters. 5189 break; 5190 5191 case CXXCopyConstructor: 5192 case CXXCopyAssignment: { 5193 // Trivial copy operations always have const, non-volatile parameter types. 5194 ConstArg = true; 5195 const ParmVarDecl *Param0 = MD->getParamDecl(0); 5196 const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>(); 5197 if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) { 5198 if (Diagnose) 5199 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5200 << Param0->getSourceRange() << Param0->getType() 5201 << Context.getLValueReferenceType( 5202 Context.getRecordType(RD).withConst()); 5203 return false; 5204 } 5205 break; 5206 } 5207 5208 case CXXMoveConstructor: 5209 case CXXMoveAssignment: { 5210 // Trivial move operations always have non-cv-qualified parameters. 5211 const ParmVarDecl *Param0 = MD->getParamDecl(0); 5212 const RValueReferenceType *RT = 5213 Param0->getType()->getAs<RValueReferenceType>(); 5214 if (!RT || RT->getPointeeType().getCVRQualifiers()) { 5215 if (Diagnose) 5216 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5217 << Param0->getSourceRange() << Param0->getType() 5218 << Context.getRValueReferenceType(Context.getRecordType(RD)); 5219 return false; 5220 } 5221 break; 5222 } 5223 5224 case CXXInvalid: 5225 llvm_unreachable("not a special member"); 5226 } 5227 5228 // FIXME: We require that the parameter-declaration-clause is equivalent to 5229 // that of an implicit declaration, not just that the declared parameter type 5230 // matches, in order to prevent absuridities like a function simultaneously 5231 // being a trivial copy constructor and a non-trivial default constructor. 5232 // This issue has not yet been assigned a core issue number. 5233 if (MD->getMinRequiredArguments() < MD->getNumParams()) { 5234 if (Diagnose) 5235 Diag(MD->getParamDecl(MD->getMinRequiredArguments())->getLocation(), 5236 diag::note_nontrivial_default_arg) 5237 << MD->getParamDecl(MD->getMinRequiredArguments())->getSourceRange(); 5238 return false; 5239 } 5240 if (MD->isVariadic()) { 5241 if (Diagnose) 5242 Diag(MD->getLocation(), diag::note_nontrivial_variadic); 5243 return false; 5244 } 5245 5246 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5247 // A copy/move [constructor or assignment operator] is trivial if 5248 // -- the [member] selected to copy/move each direct base class subobject 5249 // is trivial 5250 // 5251 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5252 // A [default constructor or destructor] is trivial if 5253 // -- all the direct base classes have trivial [default constructors or 5254 // destructors] 5255 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 5256 BE = RD->bases_end(); BI != BE; ++BI) 5257 if (!checkTrivialSubobjectCall(*this, BI->getLocStart(), 5258 ConstArg ? BI->getType().withConst() 5259 : BI->getType(), 5260 CSM, TSK_BaseClass, Diagnose)) 5261 return false; 5262 5263 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5264 // A copy/move [constructor or assignment operator] for a class X is 5265 // trivial if 5266 // -- for each non-static data member of X that is of class type (or array 5267 // thereof), the constructor selected to copy/move that member is 5268 // trivial 5269 // 5270 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5271 // A [default constructor or destructor] is trivial if 5272 // -- for all of the non-static data members of its class that are of class 5273 // type (or array thereof), each such class has a trivial [default 5274 // constructor or destructor] 5275 if (!checkTrivialClassMembers(*this, RD, CSM, ConstArg, Diagnose)) 5276 return false; 5277 5278 // C++11 [class.dtor]p5: 5279 // A destructor is trivial if [...] 5280 // -- the destructor is not virtual 5281 if (CSM == CXXDestructor && MD->isVirtual()) { 5282 if (Diagnose) 5283 Diag(MD->getLocation(), diag::note_nontrivial_virtual_dtor) << RD; 5284 return false; 5285 } 5286 5287 // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25: 5288 // A [special member] for class X is trivial if [...] 5289 // -- class X has no virtual functions and no virtual base classes 5290 if (CSM != CXXDestructor && MD->getParent()->isDynamicClass()) { 5291 if (!Diagnose) 5292 return false; 5293 5294 if (RD->getNumVBases()) { 5295 // Check for virtual bases. We already know that the corresponding 5296 // member in all bases is trivial, so vbases must all be direct. 5297 CXXBaseSpecifier &BS = *RD->vbases_begin(); 5298 assert(BS.isVirtual()); 5299 Diag(BS.getLocStart(), diag::note_nontrivial_has_virtual) << RD << 1; 5300 return false; 5301 } 5302 5303 // Must have a virtual method. 5304 for (CXXRecordDecl::method_iterator MI = RD->method_begin(), 5305 ME = RD->method_end(); MI != ME; ++MI) { 5306 if (MI->isVirtual()) { 5307 SourceLocation MLoc = MI->getLocStart(); 5308 Diag(MLoc, diag::note_nontrivial_has_virtual) << RD << 0; 5309 return false; 5310 } 5311 } 5312 5313 llvm_unreachable("dynamic class with no vbases and no virtual functions"); 5314 } 5315 5316 // Looks like it's trivial! 5317 return true; 5318} 5319 5320/// \brief Data used with FindHiddenVirtualMethod 5321namespace { 5322 struct FindHiddenVirtualMethodData { 5323 Sema *S; 5324 CXXMethodDecl *Method; 5325 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 5326 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 5327 }; 5328} 5329 5330/// \brief Check whether any most overriden method from MD in Methods 5331static bool CheckMostOverridenMethods(const CXXMethodDecl *MD, 5332 const llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5333 if (MD->size_overridden_methods() == 0) 5334 return Methods.count(MD->getCanonicalDecl()); 5335 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5336 E = MD->end_overridden_methods(); 5337 I != E; ++I) 5338 if (CheckMostOverridenMethods(*I, Methods)) 5339 return true; 5340 return false; 5341} 5342 5343/// \brief Member lookup function that determines whether a given C++ 5344/// method overloads virtual methods in a base class without overriding any, 5345/// to be used with CXXRecordDecl::lookupInBases(). 5346static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 5347 CXXBasePath &Path, 5348 void *UserData) { 5349 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 5350 5351 FindHiddenVirtualMethodData &Data 5352 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 5353 5354 DeclarationName Name = Data.Method->getDeclName(); 5355 assert(Name.getNameKind() == DeclarationName::Identifier); 5356 5357 bool foundSameNameMethod = false; 5358 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 5359 for (Path.Decls = BaseRecord->lookup(Name); 5360 !Path.Decls.empty(); 5361 Path.Decls = Path.Decls.slice(1)) { 5362 NamedDecl *D = Path.Decls.front(); 5363 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 5364 MD = MD->getCanonicalDecl(); 5365 foundSameNameMethod = true; 5366 // Interested only in hidden virtual methods. 5367 if (!MD->isVirtual()) 5368 continue; 5369 // If the method we are checking overrides a method from its base 5370 // don't warn about the other overloaded methods. 5371 if (!Data.S->IsOverload(Data.Method, MD, false)) 5372 return true; 5373 // Collect the overload only if its hidden. 5374 if (!CheckMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods)) 5375 overloadedMethods.push_back(MD); 5376 } 5377 } 5378 5379 if (foundSameNameMethod) 5380 Data.OverloadedMethods.append(overloadedMethods.begin(), 5381 overloadedMethods.end()); 5382 return foundSameNameMethod; 5383} 5384 5385/// \brief Add the most overriden methods from MD to Methods 5386static void AddMostOverridenMethods(const CXXMethodDecl *MD, 5387 llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5388 if (MD->size_overridden_methods() == 0) 5389 Methods.insert(MD->getCanonicalDecl()); 5390 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5391 E = MD->end_overridden_methods(); 5392 I != E; ++I) 5393 AddMostOverridenMethods(*I, Methods); 5394} 5395 5396/// \brief See if a method overloads virtual methods in a base class without 5397/// overriding any. 5398void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 5399 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 5400 MD->getLocation()) == DiagnosticsEngine::Ignored) 5401 return; 5402 if (!MD->getDeclName().isIdentifier()) 5403 return; 5404 5405 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 5406 /*bool RecordPaths=*/false, 5407 /*bool DetectVirtual=*/false); 5408 FindHiddenVirtualMethodData Data; 5409 Data.Method = MD; 5410 Data.S = this; 5411 5412 // Keep the base methods that were overriden or introduced in the subclass 5413 // by 'using' in a set. A base method not in this set is hidden. 5414 DeclContext::lookup_result R = DC->lookup(MD->getDeclName()); 5415 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) { 5416 NamedDecl *ND = *I; 5417 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*I)) 5418 ND = shad->getTargetDecl(); 5419 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND)) 5420 AddMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods); 5421 } 5422 5423 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 5424 !Data.OverloadedMethods.empty()) { 5425 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 5426 << MD << (Data.OverloadedMethods.size() > 1); 5427 5428 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 5429 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 5430 PartialDiagnostic PD = PDiag( 5431 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 5432 HandleFunctionTypeMismatch(PD, MD->getType(), overloadedMD->getType()); 5433 Diag(overloadedMD->getLocation(), PD); 5434 } 5435 } 5436} 5437 5438void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 5439 Decl *TagDecl, 5440 SourceLocation LBrac, 5441 SourceLocation RBrac, 5442 AttributeList *AttrList) { 5443 if (!TagDecl) 5444 return; 5445 5446 AdjustDeclIfTemplate(TagDecl); 5447 5448 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 5449 if (l->getKind() != AttributeList::AT_Visibility) 5450 continue; 5451 l->setInvalid(); 5452 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 5453 l->getName(); 5454 } 5455 5456 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 5457 // strict aliasing violation! 5458 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 5459 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 5460 5461 CheckCompletedCXXClass( 5462 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 5463} 5464 5465/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 5466/// special functions, such as the default constructor, copy 5467/// constructor, or destructor, to the given C++ class (C++ 5468/// [special]p1). This routine can only be executed just before the 5469/// definition of the class is complete. 5470void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 5471 if (!ClassDecl->hasUserDeclaredConstructor()) 5472 ++ASTContext::NumImplicitDefaultConstructors; 5473 5474 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 5475 ++ASTContext::NumImplicitCopyConstructors; 5476 5477 // If the properties or semantics of the copy constructor couldn't be 5478 // determined while the class was being declared, force a declaration 5479 // of it now. 5480 if (ClassDecl->needsOverloadResolutionForCopyConstructor()) 5481 DeclareImplicitCopyConstructor(ClassDecl); 5482 } 5483 5484 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveConstructor()) { 5485 ++ASTContext::NumImplicitMoveConstructors; 5486 5487 if (ClassDecl->needsOverloadResolutionForMoveConstructor()) 5488 DeclareImplicitMoveConstructor(ClassDecl); 5489 } 5490 5491 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 5492 ++ASTContext::NumImplicitCopyAssignmentOperators; 5493 5494 // If we have a dynamic class, then the copy assignment operator may be 5495 // virtual, so we have to declare it immediately. This ensures that, e.g., 5496 // it shows up in the right place in the vtable and that we diagnose 5497 // problems with the implicit exception specification. 5498 if (ClassDecl->isDynamicClass() || 5499 ClassDecl->needsOverloadResolutionForCopyAssignment()) 5500 DeclareImplicitCopyAssignment(ClassDecl); 5501 } 5502 5503 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveAssignment()) { 5504 ++ASTContext::NumImplicitMoveAssignmentOperators; 5505 5506 // Likewise for the move assignment operator. 5507 if (ClassDecl->isDynamicClass() || 5508 ClassDecl->needsOverloadResolutionForMoveAssignment()) 5509 DeclareImplicitMoveAssignment(ClassDecl); 5510 } 5511 5512 if (!ClassDecl->hasUserDeclaredDestructor()) { 5513 ++ASTContext::NumImplicitDestructors; 5514 5515 // If we have a dynamic class, then the destructor may be virtual, so we 5516 // have to declare the destructor immediately. This ensures that, e.g., it 5517 // shows up in the right place in the vtable and that we diagnose problems 5518 // with the implicit exception specification. 5519 if (ClassDecl->isDynamicClass() || 5520 ClassDecl->needsOverloadResolutionForDestructor()) 5521 DeclareImplicitDestructor(ClassDecl); 5522 } 5523} 5524 5525void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 5526 if (!D) 5527 return; 5528 5529 int NumParamList = D->getNumTemplateParameterLists(); 5530 for (int i = 0; i < NumParamList; i++) { 5531 TemplateParameterList* Params = D->getTemplateParameterList(i); 5532 for (TemplateParameterList::iterator Param = Params->begin(), 5533 ParamEnd = Params->end(); 5534 Param != ParamEnd; ++Param) { 5535 NamedDecl *Named = cast<NamedDecl>(*Param); 5536 if (Named->getDeclName()) { 5537 S->AddDecl(Named); 5538 IdResolver.AddDecl(Named); 5539 } 5540 } 5541 } 5542} 5543 5544void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5545 if (!D) 5546 return; 5547 5548 TemplateParameterList *Params = 0; 5549 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5550 Params = Template->getTemplateParameters(); 5551 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5552 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5553 Params = PartialSpec->getTemplateParameters(); 5554 else 5555 return; 5556 5557 for (TemplateParameterList::iterator Param = Params->begin(), 5558 ParamEnd = Params->end(); 5559 Param != ParamEnd; ++Param) { 5560 NamedDecl *Named = cast<NamedDecl>(*Param); 5561 if (Named->getDeclName()) { 5562 S->AddDecl(Named); 5563 IdResolver.AddDecl(Named); 5564 } 5565 } 5566} 5567 5568void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5569 if (!RecordD) return; 5570 AdjustDeclIfTemplate(RecordD); 5571 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5572 PushDeclContext(S, Record); 5573} 5574 5575void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5576 if (!RecordD) return; 5577 PopDeclContext(); 5578} 5579 5580/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5581/// parsing a top-level (non-nested) C++ class, and we are now 5582/// parsing those parts of the given Method declaration that could 5583/// not be parsed earlier (C++ [class.mem]p2), such as default 5584/// arguments. This action should enter the scope of the given 5585/// Method declaration as if we had just parsed the qualified method 5586/// name. However, it should not bring the parameters into scope; 5587/// that will be performed by ActOnDelayedCXXMethodParameter. 5588void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5589} 5590 5591/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5592/// C++ method declaration. We're (re-)introducing the given 5593/// function parameter into scope for use in parsing later parts of 5594/// the method declaration. For example, we could see an 5595/// ActOnParamDefaultArgument event for this parameter. 5596void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5597 if (!ParamD) 5598 return; 5599 5600 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5601 5602 // If this parameter has an unparsed default argument, clear it out 5603 // to make way for the parsed default argument. 5604 if (Param->hasUnparsedDefaultArg()) 5605 Param->setDefaultArg(0); 5606 5607 S->AddDecl(Param); 5608 if (Param->getDeclName()) 5609 IdResolver.AddDecl(Param); 5610} 5611 5612/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5613/// processing the delayed method declaration for Method. The method 5614/// declaration is now considered finished. There may be a separate 5615/// ActOnStartOfFunctionDef action later (not necessarily 5616/// immediately!) for this method, if it was also defined inside the 5617/// class body. 5618void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5619 if (!MethodD) 5620 return; 5621 5622 AdjustDeclIfTemplate(MethodD); 5623 5624 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5625 5626 // Now that we have our default arguments, check the constructor 5627 // again. It could produce additional diagnostics or affect whether 5628 // the class has implicitly-declared destructors, among other 5629 // things. 5630 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5631 CheckConstructor(Constructor); 5632 5633 // Check the default arguments, which we may have added. 5634 if (!Method->isInvalidDecl()) 5635 CheckCXXDefaultArguments(Method); 5636} 5637 5638/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5639/// the well-formedness of the constructor declarator @p D with type @p 5640/// R. If there are any errors in the declarator, this routine will 5641/// emit diagnostics and set the invalid bit to true. In any case, the type 5642/// will be updated to reflect a well-formed type for the constructor and 5643/// returned. 5644QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5645 StorageClass &SC) { 5646 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5647 5648 // C++ [class.ctor]p3: 5649 // A constructor shall not be virtual (10.3) or static (9.4). A 5650 // constructor can be invoked for a const, volatile or const 5651 // volatile object. A constructor shall not be declared const, 5652 // volatile, or const volatile (9.3.2). 5653 if (isVirtual) { 5654 if (!D.isInvalidType()) 5655 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5656 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5657 << SourceRange(D.getIdentifierLoc()); 5658 D.setInvalidType(); 5659 } 5660 if (SC == SC_Static) { 5661 if (!D.isInvalidType()) 5662 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5663 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5664 << SourceRange(D.getIdentifierLoc()); 5665 D.setInvalidType(); 5666 SC = SC_None; 5667 } 5668 5669 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5670 if (FTI.TypeQuals != 0) { 5671 if (FTI.TypeQuals & Qualifiers::Const) 5672 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5673 << "const" << SourceRange(D.getIdentifierLoc()); 5674 if (FTI.TypeQuals & Qualifiers::Volatile) 5675 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5676 << "volatile" << SourceRange(D.getIdentifierLoc()); 5677 if (FTI.TypeQuals & Qualifiers::Restrict) 5678 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5679 << "restrict" << SourceRange(D.getIdentifierLoc()); 5680 D.setInvalidType(); 5681 } 5682 5683 // C++0x [class.ctor]p4: 5684 // A constructor shall not be declared with a ref-qualifier. 5685 if (FTI.hasRefQualifier()) { 5686 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5687 << FTI.RefQualifierIsLValueRef 5688 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5689 D.setInvalidType(); 5690 } 5691 5692 // Rebuild the function type "R" without any type qualifiers (in 5693 // case any of the errors above fired) and with "void" as the 5694 // return type, since constructors don't have return types. 5695 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5696 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5697 return R; 5698 5699 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5700 EPI.TypeQuals = 0; 5701 EPI.RefQualifier = RQ_None; 5702 5703 return Context.getFunctionType(Context.VoidTy, Proto->getArgTypes(), EPI); 5704} 5705 5706/// CheckConstructor - Checks a fully-formed constructor for 5707/// well-formedness, issuing any diagnostics required. Returns true if 5708/// the constructor declarator is invalid. 5709void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5710 CXXRecordDecl *ClassDecl 5711 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5712 if (!ClassDecl) 5713 return Constructor->setInvalidDecl(); 5714 5715 // C++ [class.copy]p3: 5716 // A declaration of a constructor for a class X is ill-formed if 5717 // its first parameter is of type (optionally cv-qualified) X and 5718 // either there are no other parameters or else all other 5719 // parameters have default arguments. 5720 if (!Constructor->isInvalidDecl() && 5721 ((Constructor->getNumParams() == 1) || 5722 (Constructor->getNumParams() > 1 && 5723 Constructor->getParamDecl(1)->hasDefaultArg())) && 5724 Constructor->getTemplateSpecializationKind() 5725 != TSK_ImplicitInstantiation) { 5726 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5727 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5728 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5729 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5730 const char *ConstRef 5731 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5732 : " const &"; 5733 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5734 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5735 5736 // FIXME: Rather that making the constructor invalid, we should endeavor 5737 // to fix the type. 5738 Constructor->setInvalidDecl(); 5739 } 5740 } 5741} 5742 5743/// CheckDestructor - Checks a fully-formed destructor definition for 5744/// well-formedness, issuing any diagnostics required. Returns true 5745/// on error. 5746bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5747 CXXRecordDecl *RD = Destructor->getParent(); 5748 5749 if (Destructor->isVirtual()) { 5750 SourceLocation Loc; 5751 5752 if (!Destructor->isImplicit()) 5753 Loc = Destructor->getLocation(); 5754 else 5755 Loc = RD->getLocation(); 5756 5757 // If we have a virtual destructor, look up the deallocation function 5758 FunctionDecl *OperatorDelete = 0; 5759 DeclarationName Name = 5760 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5761 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5762 return true; 5763 5764 MarkFunctionReferenced(Loc, OperatorDelete); 5765 5766 Destructor->setOperatorDelete(OperatorDelete); 5767 } 5768 5769 return false; 5770} 5771 5772static inline bool 5773FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5774 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5775 FTI.ArgInfo[0].Param && 5776 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5777} 5778 5779/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5780/// the well-formednes of the destructor declarator @p D with type @p 5781/// R. If there are any errors in the declarator, this routine will 5782/// emit diagnostics and set the declarator to invalid. Even if this happens, 5783/// will be updated to reflect a well-formed type for the destructor and 5784/// returned. 5785QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5786 StorageClass& SC) { 5787 // C++ [class.dtor]p1: 5788 // [...] A typedef-name that names a class is a class-name 5789 // (7.1.3); however, a typedef-name that names a class shall not 5790 // be used as the identifier in the declarator for a destructor 5791 // declaration. 5792 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5793 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5794 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5795 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5796 else if (const TemplateSpecializationType *TST = 5797 DeclaratorType->getAs<TemplateSpecializationType>()) 5798 if (TST->isTypeAlias()) 5799 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5800 << DeclaratorType << 1; 5801 5802 // C++ [class.dtor]p2: 5803 // A destructor is used to destroy objects of its class type. A 5804 // destructor takes no parameters, and no return type can be 5805 // specified for it (not even void). The address of a destructor 5806 // shall not be taken. A destructor shall not be static. A 5807 // destructor can be invoked for a const, volatile or const 5808 // volatile object. A destructor shall not be declared const, 5809 // volatile or const volatile (9.3.2). 5810 if (SC == SC_Static) { 5811 if (!D.isInvalidType()) 5812 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5813 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5814 << SourceRange(D.getIdentifierLoc()) 5815 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5816 5817 SC = SC_None; 5818 } 5819 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5820 // Destructors don't have return types, but the parser will 5821 // happily parse something like: 5822 // 5823 // class X { 5824 // float ~X(); 5825 // }; 5826 // 5827 // The return type will be eliminated later. 5828 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5829 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5830 << SourceRange(D.getIdentifierLoc()); 5831 } 5832 5833 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5834 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5835 if (FTI.TypeQuals & Qualifiers::Const) 5836 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5837 << "const" << SourceRange(D.getIdentifierLoc()); 5838 if (FTI.TypeQuals & Qualifiers::Volatile) 5839 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5840 << "volatile" << SourceRange(D.getIdentifierLoc()); 5841 if (FTI.TypeQuals & Qualifiers::Restrict) 5842 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5843 << "restrict" << SourceRange(D.getIdentifierLoc()); 5844 D.setInvalidType(); 5845 } 5846 5847 // C++0x [class.dtor]p2: 5848 // A destructor shall not be declared with a ref-qualifier. 5849 if (FTI.hasRefQualifier()) { 5850 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5851 << FTI.RefQualifierIsLValueRef 5852 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5853 D.setInvalidType(); 5854 } 5855 5856 // Make sure we don't have any parameters. 5857 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5858 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5859 5860 // Delete the parameters. 5861 FTI.freeArgs(); 5862 D.setInvalidType(); 5863 } 5864 5865 // Make sure the destructor isn't variadic. 5866 if (FTI.isVariadic) { 5867 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5868 D.setInvalidType(); 5869 } 5870 5871 // Rebuild the function type "R" without any type qualifiers or 5872 // parameters (in case any of the errors above fired) and with 5873 // "void" as the return type, since destructors don't have return 5874 // types. 5875 if (!D.isInvalidType()) 5876 return R; 5877 5878 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5879 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5880 EPI.Variadic = false; 5881 EPI.TypeQuals = 0; 5882 EPI.RefQualifier = RQ_None; 5883 return Context.getFunctionType(Context.VoidTy, ArrayRef<QualType>(), EPI); 5884} 5885 5886/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5887/// well-formednes of the conversion function declarator @p D with 5888/// type @p R. If there are any errors in the declarator, this routine 5889/// will emit diagnostics and return true. Otherwise, it will return 5890/// false. Either way, the type @p R will be updated to reflect a 5891/// well-formed type for the conversion operator. 5892void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5893 StorageClass& SC) { 5894 // C++ [class.conv.fct]p1: 5895 // Neither parameter types nor return type can be specified. The 5896 // type of a conversion function (8.3.5) is "function taking no 5897 // parameter returning conversion-type-id." 5898 if (SC == SC_Static) { 5899 if (!D.isInvalidType()) 5900 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5901 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5902 << SourceRange(D.getIdentifierLoc()); 5903 D.setInvalidType(); 5904 SC = SC_None; 5905 } 5906 5907 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5908 5909 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5910 // Conversion functions don't have return types, but the parser will 5911 // happily parse something like: 5912 // 5913 // class X { 5914 // float operator bool(); 5915 // }; 5916 // 5917 // The return type will be changed later anyway. 5918 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5919 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5920 << SourceRange(D.getIdentifierLoc()); 5921 D.setInvalidType(); 5922 } 5923 5924 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5925 5926 // Make sure we don't have any parameters. 5927 if (Proto->getNumArgs() > 0) { 5928 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5929 5930 // Delete the parameters. 5931 D.getFunctionTypeInfo().freeArgs(); 5932 D.setInvalidType(); 5933 } else if (Proto->isVariadic()) { 5934 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5935 D.setInvalidType(); 5936 } 5937 5938 // Diagnose "&operator bool()" and other such nonsense. This 5939 // is actually a gcc extension which we don't support. 5940 if (Proto->getResultType() != ConvType) { 5941 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5942 << Proto->getResultType(); 5943 D.setInvalidType(); 5944 ConvType = Proto->getResultType(); 5945 } 5946 5947 // C++ [class.conv.fct]p4: 5948 // The conversion-type-id shall not represent a function type nor 5949 // an array type. 5950 if (ConvType->isArrayType()) { 5951 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5952 ConvType = Context.getPointerType(ConvType); 5953 D.setInvalidType(); 5954 } else if (ConvType->isFunctionType()) { 5955 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5956 ConvType = Context.getPointerType(ConvType); 5957 D.setInvalidType(); 5958 } 5959 5960 // Rebuild the function type "R" without any parameters (in case any 5961 // of the errors above fired) and with the conversion type as the 5962 // return type. 5963 if (D.isInvalidType()) 5964 R = Context.getFunctionType(ConvType, ArrayRef<QualType>(), 5965 Proto->getExtProtoInfo()); 5966 5967 // C++0x explicit conversion operators. 5968 if (D.getDeclSpec().isExplicitSpecified()) 5969 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5970 getLangOpts().CPlusPlus11 ? 5971 diag::warn_cxx98_compat_explicit_conversion_functions : 5972 diag::ext_explicit_conversion_functions) 5973 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5974} 5975 5976/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5977/// the declaration of the given C++ conversion function. This routine 5978/// is responsible for recording the conversion function in the C++ 5979/// class, if possible. 5980Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5981 assert(Conversion && "Expected to receive a conversion function declaration"); 5982 5983 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5984 5985 // Make sure we aren't redeclaring the conversion function. 5986 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5987 5988 // C++ [class.conv.fct]p1: 5989 // [...] A conversion function is never used to convert a 5990 // (possibly cv-qualified) object to the (possibly cv-qualified) 5991 // same object type (or a reference to it), to a (possibly 5992 // cv-qualified) base class of that type (or a reference to it), 5993 // or to (possibly cv-qualified) void. 5994 // FIXME: Suppress this warning if the conversion function ends up being a 5995 // virtual function that overrides a virtual function in a base class. 5996 QualType ClassType 5997 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5998 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5999 ConvType = ConvTypeRef->getPointeeType(); 6000 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 6001 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 6002 /* Suppress diagnostics for instantiations. */; 6003 else if (ConvType->isRecordType()) { 6004 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 6005 if (ConvType == ClassType) 6006 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 6007 << ClassType; 6008 else if (IsDerivedFrom(ClassType, ConvType)) 6009 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 6010 << ClassType << ConvType; 6011 } else if (ConvType->isVoidType()) { 6012 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 6013 << ClassType << ConvType; 6014 } 6015 6016 if (FunctionTemplateDecl *ConversionTemplate 6017 = Conversion->getDescribedFunctionTemplate()) 6018 return ConversionTemplate; 6019 6020 return Conversion; 6021} 6022 6023//===----------------------------------------------------------------------===// 6024// Namespace Handling 6025//===----------------------------------------------------------------------===// 6026 6027/// \brief Diagnose a mismatch in 'inline' qualifiers when a namespace is 6028/// reopened. 6029static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc, 6030 SourceLocation Loc, 6031 IdentifierInfo *II, bool *IsInline, 6032 NamespaceDecl *PrevNS) { 6033 assert(*IsInline != PrevNS->isInline()); 6034 6035 // HACK: Work around a bug in libstdc++4.6's <atomic>, where 6036 // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as 6037 // inline namespaces, with the intention of bringing names into namespace std. 6038 // 6039 // We support this just well enough to get that case working; this is not 6040 // sufficient to support reopening namespaces as inline in general. 6041 if (*IsInline && II && II->getName().startswith("__atomic") && 6042 S.getSourceManager().isInSystemHeader(Loc)) { 6043 // Mark all prior declarations of the namespace as inline. 6044 for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS; 6045 NS = NS->getPreviousDecl()) 6046 NS->setInline(*IsInline); 6047 // Patch up the lookup table for the containing namespace. This isn't really 6048 // correct, but it's good enough for this particular case. 6049 for (DeclContext::decl_iterator I = PrevNS->decls_begin(), 6050 E = PrevNS->decls_end(); I != E; ++I) 6051 if (NamedDecl *ND = dyn_cast<NamedDecl>(*I)) 6052 PrevNS->getParent()->makeDeclVisibleInContext(ND); 6053 return; 6054 } 6055 6056 if (PrevNS->isInline()) 6057 // The user probably just forgot the 'inline', so suggest that it 6058 // be added back. 6059 S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 6060 << FixItHint::CreateInsertion(KeywordLoc, "inline "); 6061 else 6062 S.Diag(Loc, diag::err_inline_namespace_mismatch) 6063 << IsInline; 6064 6065 S.Diag(PrevNS->getLocation(), diag::note_previous_definition); 6066 *IsInline = PrevNS->isInline(); 6067} 6068 6069/// ActOnStartNamespaceDef - This is called at the start of a namespace 6070/// definition. 6071Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 6072 SourceLocation InlineLoc, 6073 SourceLocation NamespaceLoc, 6074 SourceLocation IdentLoc, 6075 IdentifierInfo *II, 6076 SourceLocation LBrace, 6077 AttributeList *AttrList) { 6078 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 6079 // For anonymous namespace, take the location of the left brace. 6080 SourceLocation Loc = II ? IdentLoc : LBrace; 6081 bool IsInline = InlineLoc.isValid(); 6082 bool IsInvalid = false; 6083 bool IsStd = false; 6084 bool AddToKnown = false; 6085 Scope *DeclRegionScope = NamespcScope->getParent(); 6086 6087 NamespaceDecl *PrevNS = 0; 6088 if (II) { 6089 // C++ [namespace.def]p2: 6090 // The identifier in an original-namespace-definition shall not 6091 // have been previously defined in the declarative region in 6092 // which the original-namespace-definition appears. The 6093 // identifier in an original-namespace-definition is the name of 6094 // the namespace. Subsequently in that declarative region, it is 6095 // treated as an original-namespace-name. 6096 // 6097 // Since namespace names are unique in their scope, and we don't 6098 // look through using directives, just look for any ordinary names. 6099 6100 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 6101 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 6102 Decl::IDNS_Namespace; 6103 NamedDecl *PrevDecl = 0; 6104 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 6105 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 6106 ++I) { 6107 if ((*I)->getIdentifierNamespace() & IDNS) { 6108 PrevDecl = *I; 6109 break; 6110 } 6111 } 6112 6113 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 6114 6115 if (PrevNS) { 6116 // This is an extended namespace definition. 6117 if (IsInline != PrevNS->isInline()) 6118 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II, 6119 &IsInline, PrevNS); 6120 } else if (PrevDecl) { 6121 // This is an invalid name redefinition. 6122 Diag(Loc, diag::err_redefinition_different_kind) 6123 << II; 6124 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6125 IsInvalid = true; 6126 // Continue on to push Namespc as current DeclContext and return it. 6127 } else if (II->isStr("std") && 6128 CurContext->getRedeclContext()->isTranslationUnit()) { 6129 // This is the first "real" definition of the namespace "std", so update 6130 // our cache of the "std" namespace to point at this definition. 6131 PrevNS = getStdNamespace(); 6132 IsStd = true; 6133 AddToKnown = !IsInline; 6134 } else { 6135 // We've seen this namespace for the first time. 6136 AddToKnown = !IsInline; 6137 } 6138 } else { 6139 // Anonymous namespaces. 6140 6141 // Determine whether the parent already has an anonymous namespace. 6142 DeclContext *Parent = CurContext->getRedeclContext(); 6143 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6144 PrevNS = TU->getAnonymousNamespace(); 6145 } else { 6146 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 6147 PrevNS = ND->getAnonymousNamespace(); 6148 } 6149 6150 if (PrevNS && IsInline != PrevNS->isInline()) 6151 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II, 6152 &IsInline, PrevNS); 6153 } 6154 6155 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 6156 StartLoc, Loc, II, PrevNS); 6157 if (IsInvalid) 6158 Namespc->setInvalidDecl(); 6159 6160 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 6161 6162 // FIXME: Should we be merging attributes? 6163 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 6164 PushNamespaceVisibilityAttr(Attr, Loc); 6165 6166 if (IsStd) 6167 StdNamespace = Namespc; 6168 if (AddToKnown) 6169 KnownNamespaces[Namespc] = false; 6170 6171 if (II) { 6172 PushOnScopeChains(Namespc, DeclRegionScope); 6173 } else { 6174 // Link the anonymous namespace into its parent. 6175 DeclContext *Parent = CurContext->getRedeclContext(); 6176 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6177 TU->setAnonymousNamespace(Namespc); 6178 } else { 6179 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 6180 } 6181 6182 CurContext->addDecl(Namespc); 6183 6184 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 6185 // behaves as if it were replaced by 6186 // namespace unique { /* empty body */ } 6187 // using namespace unique; 6188 // namespace unique { namespace-body } 6189 // where all occurrences of 'unique' in a translation unit are 6190 // replaced by the same identifier and this identifier differs 6191 // from all other identifiers in the entire program. 6192 6193 // We just create the namespace with an empty name and then add an 6194 // implicit using declaration, just like the standard suggests. 6195 // 6196 // CodeGen enforces the "universally unique" aspect by giving all 6197 // declarations semantically contained within an anonymous 6198 // namespace internal linkage. 6199 6200 if (!PrevNS) { 6201 UsingDirectiveDecl* UD 6202 = UsingDirectiveDecl::Create(Context, Parent, 6203 /* 'using' */ LBrace, 6204 /* 'namespace' */ SourceLocation(), 6205 /* qualifier */ NestedNameSpecifierLoc(), 6206 /* identifier */ SourceLocation(), 6207 Namespc, 6208 /* Ancestor */ Parent); 6209 UD->setImplicit(); 6210 Parent->addDecl(UD); 6211 } 6212 } 6213 6214 ActOnDocumentableDecl(Namespc); 6215 6216 // Although we could have an invalid decl (i.e. the namespace name is a 6217 // redefinition), push it as current DeclContext and try to continue parsing. 6218 // FIXME: We should be able to push Namespc here, so that the each DeclContext 6219 // for the namespace has the declarations that showed up in that particular 6220 // namespace definition. 6221 PushDeclContext(NamespcScope, Namespc); 6222 return Namespc; 6223} 6224 6225/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 6226/// is a namespace alias, returns the namespace it points to. 6227static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 6228 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 6229 return AD->getNamespace(); 6230 return dyn_cast_or_null<NamespaceDecl>(D); 6231} 6232 6233/// ActOnFinishNamespaceDef - This callback is called after a namespace is 6234/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 6235void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 6236 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 6237 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 6238 Namespc->setRBraceLoc(RBrace); 6239 PopDeclContext(); 6240 if (Namespc->hasAttr<VisibilityAttr>()) 6241 PopPragmaVisibility(true, RBrace); 6242} 6243 6244CXXRecordDecl *Sema::getStdBadAlloc() const { 6245 return cast_or_null<CXXRecordDecl>( 6246 StdBadAlloc.get(Context.getExternalSource())); 6247} 6248 6249NamespaceDecl *Sema::getStdNamespace() const { 6250 return cast_or_null<NamespaceDecl>( 6251 StdNamespace.get(Context.getExternalSource())); 6252} 6253 6254/// \brief Retrieve the special "std" namespace, which may require us to 6255/// implicitly define the namespace. 6256NamespaceDecl *Sema::getOrCreateStdNamespace() { 6257 if (!StdNamespace) { 6258 // The "std" namespace has not yet been defined, so build one implicitly. 6259 StdNamespace = NamespaceDecl::Create(Context, 6260 Context.getTranslationUnitDecl(), 6261 /*Inline=*/false, 6262 SourceLocation(), SourceLocation(), 6263 &PP.getIdentifierTable().get("std"), 6264 /*PrevDecl=*/0); 6265 getStdNamespace()->setImplicit(true); 6266 } 6267 6268 return getStdNamespace(); 6269} 6270 6271bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 6272 assert(getLangOpts().CPlusPlus && 6273 "Looking for std::initializer_list outside of C++."); 6274 6275 // We're looking for implicit instantiations of 6276 // template <typename E> class std::initializer_list. 6277 6278 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 6279 return false; 6280 6281 ClassTemplateDecl *Template = 0; 6282 const TemplateArgument *Arguments = 0; 6283 6284 if (const RecordType *RT = Ty->getAs<RecordType>()) { 6285 6286 ClassTemplateSpecializationDecl *Specialization = 6287 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 6288 if (!Specialization) 6289 return false; 6290 6291 Template = Specialization->getSpecializedTemplate(); 6292 Arguments = Specialization->getTemplateArgs().data(); 6293 } else if (const TemplateSpecializationType *TST = 6294 Ty->getAs<TemplateSpecializationType>()) { 6295 Template = dyn_cast_or_null<ClassTemplateDecl>( 6296 TST->getTemplateName().getAsTemplateDecl()); 6297 Arguments = TST->getArgs(); 6298 } 6299 if (!Template) 6300 return false; 6301 6302 if (!StdInitializerList) { 6303 // Haven't recognized std::initializer_list yet, maybe this is it. 6304 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 6305 if (TemplateClass->getIdentifier() != 6306 &PP.getIdentifierTable().get("initializer_list") || 6307 !getStdNamespace()->InEnclosingNamespaceSetOf( 6308 TemplateClass->getDeclContext())) 6309 return false; 6310 // This is a template called std::initializer_list, but is it the right 6311 // template? 6312 TemplateParameterList *Params = Template->getTemplateParameters(); 6313 if (Params->getMinRequiredArguments() != 1) 6314 return false; 6315 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 6316 return false; 6317 6318 // It's the right template. 6319 StdInitializerList = Template; 6320 } 6321 6322 if (Template != StdInitializerList) 6323 return false; 6324 6325 // This is an instance of std::initializer_list. Find the argument type. 6326 if (Element) 6327 *Element = Arguments[0].getAsType(); 6328 return true; 6329} 6330 6331static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 6332 NamespaceDecl *Std = S.getStdNamespace(); 6333 if (!Std) { 6334 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6335 return 0; 6336 } 6337 6338 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 6339 Loc, Sema::LookupOrdinaryName); 6340 if (!S.LookupQualifiedName(Result, Std)) { 6341 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6342 return 0; 6343 } 6344 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 6345 if (!Template) { 6346 Result.suppressDiagnostics(); 6347 // We found something weird. Complain about the first thing we found. 6348 NamedDecl *Found = *Result.begin(); 6349 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 6350 return 0; 6351 } 6352 6353 // We found some template called std::initializer_list. Now verify that it's 6354 // correct. 6355 TemplateParameterList *Params = Template->getTemplateParameters(); 6356 if (Params->getMinRequiredArguments() != 1 || 6357 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 6358 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 6359 return 0; 6360 } 6361 6362 return Template; 6363} 6364 6365QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 6366 if (!StdInitializerList) { 6367 StdInitializerList = LookupStdInitializerList(*this, Loc); 6368 if (!StdInitializerList) 6369 return QualType(); 6370 } 6371 6372 TemplateArgumentListInfo Args(Loc, Loc); 6373 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 6374 Context.getTrivialTypeSourceInfo(Element, 6375 Loc))); 6376 return Context.getCanonicalType( 6377 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 6378} 6379 6380bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 6381 // C++ [dcl.init.list]p2: 6382 // A constructor is an initializer-list constructor if its first parameter 6383 // is of type std::initializer_list<E> or reference to possibly cv-qualified 6384 // std::initializer_list<E> for some type E, and either there are no other 6385 // parameters or else all other parameters have default arguments. 6386 if (Ctor->getNumParams() < 1 || 6387 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 6388 return false; 6389 6390 QualType ArgType = Ctor->getParamDecl(0)->getType(); 6391 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 6392 ArgType = RT->getPointeeType().getUnqualifiedType(); 6393 6394 return isStdInitializerList(ArgType, 0); 6395} 6396 6397/// \brief Determine whether a using statement is in a context where it will be 6398/// apply in all contexts. 6399static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 6400 switch (CurContext->getDeclKind()) { 6401 case Decl::TranslationUnit: 6402 return true; 6403 case Decl::LinkageSpec: 6404 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 6405 default: 6406 return false; 6407 } 6408} 6409 6410namespace { 6411 6412// Callback to only accept typo corrections that are namespaces. 6413class NamespaceValidatorCCC : public CorrectionCandidateCallback { 6414 public: 6415 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 6416 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 6417 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 6418 } 6419 return false; 6420 } 6421}; 6422 6423} 6424 6425static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 6426 CXXScopeSpec &SS, 6427 SourceLocation IdentLoc, 6428 IdentifierInfo *Ident) { 6429 NamespaceValidatorCCC Validator; 6430 R.clear(); 6431 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 6432 R.getLookupKind(), Sc, &SS, 6433 Validator)) { 6434 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 6435 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 6436 if (DeclContext *DC = S.computeDeclContext(SS, false)) 6437 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 6438 << Ident << DC << CorrectedQuotedStr << SS.getRange() 6439 << FixItHint::CreateReplacement(Corrected.getCorrectionRange(), 6440 CorrectedStr); 6441 else 6442 S.Diag(IdentLoc, diag::err_using_directive_suggest) 6443 << Ident << CorrectedQuotedStr 6444 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 6445 6446 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 6447 diag::note_namespace_defined_here) << CorrectedQuotedStr; 6448 6449 R.addDecl(Corrected.getCorrectionDecl()); 6450 return true; 6451 } 6452 return false; 6453} 6454 6455Decl *Sema::ActOnUsingDirective(Scope *S, 6456 SourceLocation UsingLoc, 6457 SourceLocation NamespcLoc, 6458 CXXScopeSpec &SS, 6459 SourceLocation IdentLoc, 6460 IdentifierInfo *NamespcName, 6461 AttributeList *AttrList) { 6462 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6463 assert(NamespcName && "Invalid NamespcName."); 6464 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 6465 6466 // This can only happen along a recovery path. 6467 while (S->getFlags() & Scope::TemplateParamScope) 6468 S = S->getParent(); 6469 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6470 6471 UsingDirectiveDecl *UDir = 0; 6472 NestedNameSpecifier *Qualifier = 0; 6473 if (SS.isSet()) 6474 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 6475 6476 // Lookup namespace name. 6477 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 6478 LookupParsedName(R, S, &SS); 6479 if (R.isAmbiguous()) 6480 return 0; 6481 6482 if (R.empty()) { 6483 R.clear(); 6484 // Allow "using namespace std;" or "using namespace ::std;" even if 6485 // "std" hasn't been defined yet, for GCC compatibility. 6486 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 6487 NamespcName->isStr("std")) { 6488 Diag(IdentLoc, diag::ext_using_undefined_std); 6489 R.addDecl(getOrCreateStdNamespace()); 6490 R.resolveKind(); 6491 } 6492 // Otherwise, attempt typo correction. 6493 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 6494 } 6495 6496 if (!R.empty()) { 6497 NamedDecl *Named = R.getFoundDecl(); 6498 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 6499 && "expected namespace decl"); 6500 // C++ [namespace.udir]p1: 6501 // A using-directive specifies that the names in the nominated 6502 // namespace can be used in the scope in which the 6503 // using-directive appears after the using-directive. During 6504 // unqualified name lookup (3.4.1), the names appear as if they 6505 // were declared in the nearest enclosing namespace which 6506 // contains both the using-directive and the nominated 6507 // namespace. [Note: in this context, "contains" means "contains 6508 // directly or indirectly". ] 6509 6510 // Find enclosing context containing both using-directive and 6511 // nominated namespace. 6512 NamespaceDecl *NS = getNamespaceDecl(Named); 6513 DeclContext *CommonAncestor = cast<DeclContext>(NS); 6514 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 6515 CommonAncestor = CommonAncestor->getParent(); 6516 6517 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 6518 SS.getWithLocInContext(Context), 6519 IdentLoc, Named, CommonAncestor); 6520 6521 if (IsUsingDirectiveInToplevelContext(CurContext) && 6522 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 6523 Diag(IdentLoc, diag::warn_using_directive_in_header); 6524 } 6525 6526 PushUsingDirective(S, UDir); 6527 } else { 6528 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6529 } 6530 6531 if (UDir) 6532 ProcessDeclAttributeList(S, UDir, AttrList); 6533 6534 return UDir; 6535} 6536 6537void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 6538 // If the scope has an associated entity and the using directive is at 6539 // namespace or translation unit scope, add the UsingDirectiveDecl into 6540 // its lookup structure so qualified name lookup can find it. 6541 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 6542 if (Ctx && !Ctx->isFunctionOrMethod()) 6543 Ctx->addDecl(UDir); 6544 else 6545 // Otherwise, it is at block sope. The using-directives will affect lookup 6546 // only to the end of the scope. 6547 S->PushUsingDirective(UDir); 6548} 6549 6550 6551Decl *Sema::ActOnUsingDeclaration(Scope *S, 6552 AccessSpecifier AS, 6553 bool HasUsingKeyword, 6554 SourceLocation UsingLoc, 6555 CXXScopeSpec &SS, 6556 UnqualifiedId &Name, 6557 AttributeList *AttrList, 6558 bool IsTypeName, 6559 SourceLocation TypenameLoc) { 6560 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6561 6562 switch (Name.getKind()) { 6563 case UnqualifiedId::IK_ImplicitSelfParam: 6564 case UnqualifiedId::IK_Identifier: 6565 case UnqualifiedId::IK_OperatorFunctionId: 6566 case UnqualifiedId::IK_LiteralOperatorId: 6567 case UnqualifiedId::IK_ConversionFunctionId: 6568 break; 6569 6570 case UnqualifiedId::IK_ConstructorName: 6571 case UnqualifiedId::IK_ConstructorTemplateId: 6572 // C++11 inheriting constructors. 6573 Diag(Name.getLocStart(), 6574 getLangOpts().CPlusPlus11 ? 6575 diag::warn_cxx98_compat_using_decl_constructor : 6576 diag::err_using_decl_constructor) 6577 << SS.getRange(); 6578 6579 if (getLangOpts().CPlusPlus11) break; 6580 6581 return 0; 6582 6583 case UnqualifiedId::IK_DestructorName: 6584 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 6585 << SS.getRange(); 6586 return 0; 6587 6588 case UnqualifiedId::IK_TemplateId: 6589 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 6590 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 6591 return 0; 6592 } 6593 6594 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 6595 DeclarationName TargetName = TargetNameInfo.getName(); 6596 if (!TargetName) 6597 return 0; 6598 6599 // Warn about access declarations. 6600 // TODO: store that the declaration was written without 'using' and 6601 // talk about access decls instead of using decls in the 6602 // diagnostics. 6603 if (!HasUsingKeyword) { 6604 UsingLoc = Name.getLocStart(); 6605 6606 Diag(UsingLoc, diag::warn_access_decl_deprecated) 6607 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 6608 } 6609 6610 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 6611 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 6612 return 0; 6613 6614 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 6615 TargetNameInfo, AttrList, 6616 /* IsInstantiation */ false, 6617 IsTypeName, TypenameLoc); 6618 if (UD) 6619 PushOnScopeChains(UD, S, /*AddToContext*/ false); 6620 6621 return UD; 6622} 6623 6624/// \brief Determine whether a using declaration considers the given 6625/// declarations as "equivalent", e.g., if they are redeclarations of 6626/// the same entity or are both typedefs of the same type. 6627static bool 6628IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 6629 bool &SuppressRedeclaration) { 6630 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 6631 SuppressRedeclaration = false; 6632 return true; 6633 } 6634 6635 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 6636 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6637 SuppressRedeclaration = true; 6638 return Context.hasSameType(TD1->getUnderlyingType(), 6639 TD2->getUnderlyingType()); 6640 } 6641 6642 return false; 6643} 6644 6645 6646/// Determines whether to create a using shadow decl for a particular 6647/// decl, given the set of decls existing prior to this using lookup. 6648bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6649 const LookupResult &Previous) { 6650 // Diagnose finding a decl which is not from a base class of the 6651 // current class. We do this now because there are cases where this 6652 // function will silently decide not to build a shadow decl, which 6653 // will pre-empt further diagnostics. 6654 // 6655 // We don't need to do this in C++0x because we do the check once on 6656 // the qualifier. 6657 // 6658 // FIXME: diagnose the following if we care enough: 6659 // struct A { int foo; }; 6660 // struct B : A { using A::foo; }; 6661 // template <class T> struct C : A {}; 6662 // template <class T> struct D : C<T> { using B::foo; } // <--- 6663 // This is invalid (during instantiation) in C++03 because B::foo 6664 // resolves to the using decl in B, which is not a base class of D<T>. 6665 // We can't diagnose it immediately because C<T> is an unknown 6666 // specialization. The UsingShadowDecl in D<T> then points directly 6667 // to A::foo, which will look well-formed when we instantiate. 6668 // The right solution is to not collapse the shadow-decl chain. 6669 if (!getLangOpts().CPlusPlus11 && CurContext->isRecord()) { 6670 DeclContext *OrigDC = Orig->getDeclContext(); 6671 6672 // Handle enums and anonymous structs. 6673 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6674 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6675 while (OrigRec->isAnonymousStructOrUnion()) 6676 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6677 6678 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6679 if (OrigDC == CurContext) { 6680 Diag(Using->getLocation(), 6681 diag::err_using_decl_nested_name_specifier_is_current_class) 6682 << Using->getQualifierLoc().getSourceRange(); 6683 Diag(Orig->getLocation(), diag::note_using_decl_target); 6684 return true; 6685 } 6686 6687 Diag(Using->getQualifierLoc().getBeginLoc(), 6688 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6689 << Using->getQualifier() 6690 << cast<CXXRecordDecl>(CurContext) 6691 << Using->getQualifierLoc().getSourceRange(); 6692 Diag(Orig->getLocation(), diag::note_using_decl_target); 6693 return true; 6694 } 6695 } 6696 6697 if (Previous.empty()) return false; 6698 6699 NamedDecl *Target = Orig; 6700 if (isa<UsingShadowDecl>(Target)) 6701 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6702 6703 // If the target happens to be one of the previous declarations, we 6704 // don't have a conflict. 6705 // 6706 // FIXME: but we might be increasing its access, in which case we 6707 // should redeclare it. 6708 NamedDecl *NonTag = 0, *Tag = 0; 6709 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6710 I != E; ++I) { 6711 NamedDecl *D = (*I)->getUnderlyingDecl(); 6712 bool Result; 6713 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6714 return Result; 6715 6716 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6717 } 6718 6719 if (Target->isFunctionOrFunctionTemplate()) { 6720 FunctionDecl *FD; 6721 if (isa<FunctionTemplateDecl>(Target)) 6722 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6723 else 6724 FD = cast<FunctionDecl>(Target); 6725 6726 NamedDecl *OldDecl = 0; 6727 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6728 case Ovl_Overload: 6729 return false; 6730 6731 case Ovl_NonFunction: 6732 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6733 break; 6734 6735 // We found a decl with the exact signature. 6736 case Ovl_Match: 6737 // If we're in a record, we want to hide the target, so we 6738 // return true (without a diagnostic) to tell the caller not to 6739 // build a shadow decl. 6740 if (CurContext->isRecord()) 6741 return true; 6742 6743 // If we're not in a record, this is an error. 6744 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6745 break; 6746 } 6747 6748 Diag(Target->getLocation(), diag::note_using_decl_target); 6749 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6750 return true; 6751 } 6752 6753 // Target is not a function. 6754 6755 if (isa<TagDecl>(Target)) { 6756 // No conflict between a tag and a non-tag. 6757 if (!Tag) return false; 6758 6759 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6760 Diag(Target->getLocation(), diag::note_using_decl_target); 6761 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6762 return true; 6763 } 6764 6765 // No conflict between a tag and a non-tag. 6766 if (!NonTag) return false; 6767 6768 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6769 Diag(Target->getLocation(), diag::note_using_decl_target); 6770 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6771 return true; 6772} 6773 6774/// Builds a shadow declaration corresponding to a 'using' declaration. 6775UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6776 UsingDecl *UD, 6777 NamedDecl *Orig) { 6778 6779 // If we resolved to another shadow declaration, just coalesce them. 6780 NamedDecl *Target = Orig; 6781 if (isa<UsingShadowDecl>(Target)) { 6782 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6783 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6784 } 6785 6786 UsingShadowDecl *Shadow 6787 = UsingShadowDecl::Create(Context, CurContext, 6788 UD->getLocation(), UD, Target); 6789 UD->addShadowDecl(Shadow); 6790 6791 Shadow->setAccess(UD->getAccess()); 6792 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6793 Shadow->setInvalidDecl(); 6794 6795 if (S) 6796 PushOnScopeChains(Shadow, S); 6797 else 6798 CurContext->addDecl(Shadow); 6799 6800 6801 return Shadow; 6802} 6803 6804/// Hides a using shadow declaration. This is required by the current 6805/// using-decl implementation when a resolvable using declaration in a 6806/// class is followed by a declaration which would hide or override 6807/// one or more of the using decl's targets; for example: 6808/// 6809/// struct Base { void foo(int); }; 6810/// struct Derived : Base { 6811/// using Base::foo; 6812/// void foo(int); 6813/// }; 6814/// 6815/// The governing language is C++03 [namespace.udecl]p12: 6816/// 6817/// When a using-declaration brings names from a base class into a 6818/// derived class scope, member functions in the derived class 6819/// override and/or hide member functions with the same name and 6820/// parameter types in a base class (rather than conflicting). 6821/// 6822/// There are two ways to implement this: 6823/// (1) optimistically create shadow decls when they're not hidden 6824/// by existing declarations, or 6825/// (2) don't create any shadow decls (or at least don't make them 6826/// visible) until we've fully parsed/instantiated the class. 6827/// The problem with (1) is that we might have to retroactively remove 6828/// a shadow decl, which requires several O(n) operations because the 6829/// decl structures are (very reasonably) not designed for removal. 6830/// (2) avoids this but is very fiddly and phase-dependent. 6831void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6832 if (Shadow->getDeclName().getNameKind() == 6833 DeclarationName::CXXConversionFunctionName) 6834 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6835 6836 // Remove it from the DeclContext... 6837 Shadow->getDeclContext()->removeDecl(Shadow); 6838 6839 // ...and the scope, if applicable... 6840 if (S) { 6841 S->RemoveDecl(Shadow); 6842 IdResolver.RemoveDecl(Shadow); 6843 } 6844 6845 // ...and the using decl. 6846 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6847 6848 // TODO: complain somehow if Shadow was used. It shouldn't 6849 // be possible for this to happen, because...? 6850} 6851 6852/// Builds a using declaration. 6853/// 6854/// \param IsInstantiation - Whether this call arises from an 6855/// instantiation of an unresolved using declaration. We treat 6856/// the lookup differently for these declarations. 6857NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6858 SourceLocation UsingLoc, 6859 CXXScopeSpec &SS, 6860 const DeclarationNameInfo &NameInfo, 6861 AttributeList *AttrList, 6862 bool IsInstantiation, 6863 bool IsTypeName, 6864 SourceLocation TypenameLoc) { 6865 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6866 SourceLocation IdentLoc = NameInfo.getLoc(); 6867 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6868 6869 // FIXME: We ignore attributes for now. 6870 6871 if (SS.isEmpty()) { 6872 Diag(IdentLoc, diag::err_using_requires_qualname); 6873 return 0; 6874 } 6875 6876 // Do the redeclaration lookup in the current scope. 6877 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6878 ForRedeclaration); 6879 Previous.setHideTags(false); 6880 if (S) { 6881 LookupName(Previous, S); 6882 6883 // It is really dumb that we have to do this. 6884 LookupResult::Filter F = Previous.makeFilter(); 6885 while (F.hasNext()) { 6886 NamedDecl *D = F.next(); 6887 if (!isDeclInScope(D, CurContext, S)) 6888 F.erase(); 6889 } 6890 F.done(); 6891 } else { 6892 assert(IsInstantiation && "no scope in non-instantiation"); 6893 assert(CurContext->isRecord() && "scope not record in instantiation"); 6894 LookupQualifiedName(Previous, CurContext); 6895 } 6896 6897 // Check for invalid redeclarations. 6898 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6899 return 0; 6900 6901 // Check for bad qualifiers. 6902 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6903 return 0; 6904 6905 DeclContext *LookupContext = computeDeclContext(SS); 6906 NamedDecl *D; 6907 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6908 if (!LookupContext) { 6909 if (IsTypeName) { 6910 // FIXME: not all declaration name kinds are legal here 6911 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6912 UsingLoc, TypenameLoc, 6913 QualifierLoc, 6914 IdentLoc, NameInfo.getName()); 6915 } else { 6916 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6917 QualifierLoc, NameInfo); 6918 } 6919 } else { 6920 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6921 NameInfo, IsTypeName); 6922 } 6923 D->setAccess(AS); 6924 CurContext->addDecl(D); 6925 6926 if (!LookupContext) return D; 6927 UsingDecl *UD = cast<UsingDecl>(D); 6928 6929 if (RequireCompleteDeclContext(SS, LookupContext)) { 6930 UD->setInvalidDecl(); 6931 return UD; 6932 } 6933 6934 // The normal rules do not apply to inheriting constructor declarations. 6935 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6936 if (CheckInheritingConstructorUsingDecl(UD)) 6937 UD->setInvalidDecl(); 6938 return UD; 6939 } 6940 6941 // Otherwise, look up the target name. 6942 6943 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6944 6945 // Unlike most lookups, we don't always want to hide tag 6946 // declarations: tag names are visible through the using declaration 6947 // even if hidden by ordinary names, *except* in a dependent context 6948 // where it's important for the sanity of two-phase lookup. 6949 if (!IsInstantiation) 6950 R.setHideTags(false); 6951 6952 // For the purposes of this lookup, we have a base object type 6953 // equal to that of the current context. 6954 if (CurContext->isRecord()) { 6955 R.setBaseObjectType( 6956 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6957 } 6958 6959 LookupQualifiedName(R, LookupContext); 6960 6961 if (R.empty()) { 6962 Diag(IdentLoc, diag::err_no_member) 6963 << NameInfo.getName() << LookupContext << SS.getRange(); 6964 UD->setInvalidDecl(); 6965 return UD; 6966 } 6967 6968 if (R.isAmbiguous()) { 6969 UD->setInvalidDecl(); 6970 return UD; 6971 } 6972 6973 if (IsTypeName) { 6974 // If we asked for a typename and got a non-type decl, error out. 6975 if (!R.getAsSingle<TypeDecl>()) { 6976 Diag(IdentLoc, diag::err_using_typename_non_type); 6977 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6978 Diag((*I)->getUnderlyingDecl()->getLocation(), 6979 diag::note_using_decl_target); 6980 UD->setInvalidDecl(); 6981 return UD; 6982 } 6983 } else { 6984 // If we asked for a non-typename and we got a type, error out, 6985 // but only if this is an instantiation of an unresolved using 6986 // decl. Otherwise just silently find the type name. 6987 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6988 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6989 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6990 UD->setInvalidDecl(); 6991 return UD; 6992 } 6993 } 6994 6995 // C++0x N2914 [namespace.udecl]p6: 6996 // A using-declaration shall not name a namespace. 6997 if (R.getAsSingle<NamespaceDecl>()) { 6998 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6999 << SS.getRange(); 7000 UD->setInvalidDecl(); 7001 return UD; 7002 } 7003 7004 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 7005 if (!CheckUsingShadowDecl(UD, *I, Previous)) 7006 BuildUsingShadowDecl(S, UD, *I); 7007 } 7008 7009 return UD; 7010} 7011 7012/// Additional checks for a using declaration referring to a constructor name. 7013bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 7014 assert(!UD->isTypeName() && "expecting a constructor name"); 7015 7016 const Type *SourceType = UD->getQualifier()->getAsType(); 7017 assert(SourceType && 7018 "Using decl naming constructor doesn't have type in scope spec."); 7019 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 7020 7021 // Check whether the named type is a direct base class. 7022 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 7023 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 7024 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 7025 BaseIt != BaseE; ++BaseIt) { 7026 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 7027 if (CanonicalSourceType == BaseType) 7028 break; 7029 if (BaseIt->getType()->isDependentType()) 7030 break; 7031 } 7032 7033 if (BaseIt == BaseE) { 7034 // Did not find SourceType in the bases. 7035 Diag(UD->getUsingLocation(), 7036 diag::err_using_decl_constructor_not_in_direct_base) 7037 << UD->getNameInfo().getSourceRange() 7038 << QualType(SourceType, 0) << TargetClass; 7039 return true; 7040 } 7041 7042 if (!CurContext->isDependentContext()) 7043 BaseIt->setInheritConstructors(); 7044 7045 return false; 7046} 7047 7048/// Checks that the given using declaration is not an invalid 7049/// redeclaration. Note that this is checking only for the using decl 7050/// itself, not for any ill-formedness among the UsingShadowDecls. 7051bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 7052 bool isTypeName, 7053 const CXXScopeSpec &SS, 7054 SourceLocation NameLoc, 7055 const LookupResult &Prev) { 7056 // C++03 [namespace.udecl]p8: 7057 // C++0x [namespace.udecl]p10: 7058 // A using-declaration is a declaration and can therefore be used 7059 // repeatedly where (and only where) multiple declarations are 7060 // allowed. 7061 // 7062 // That's in non-member contexts. 7063 if (!CurContext->getRedeclContext()->isRecord()) 7064 return false; 7065 7066 NestedNameSpecifier *Qual 7067 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 7068 7069 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 7070 NamedDecl *D = *I; 7071 7072 bool DTypename; 7073 NestedNameSpecifier *DQual; 7074 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 7075 DTypename = UD->isTypeName(); 7076 DQual = UD->getQualifier(); 7077 } else if (UnresolvedUsingValueDecl *UD 7078 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 7079 DTypename = false; 7080 DQual = UD->getQualifier(); 7081 } else if (UnresolvedUsingTypenameDecl *UD 7082 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 7083 DTypename = true; 7084 DQual = UD->getQualifier(); 7085 } else continue; 7086 7087 // using decls differ if one says 'typename' and the other doesn't. 7088 // FIXME: non-dependent using decls? 7089 if (isTypeName != DTypename) continue; 7090 7091 // using decls differ if they name different scopes (but note that 7092 // template instantiation can cause this check to trigger when it 7093 // didn't before instantiation). 7094 if (Context.getCanonicalNestedNameSpecifier(Qual) != 7095 Context.getCanonicalNestedNameSpecifier(DQual)) 7096 continue; 7097 7098 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 7099 Diag(D->getLocation(), diag::note_using_decl) << 1; 7100 return true; 7101 } 7102 7103 return false; 7104} 7105 7106 7107/// Checks that the given nested-name qualifier used in a using decl 7108/// in the current context is appropriately related to the current 7109/// scope. If an error is found, diagnoses it and returns true. 7110bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 7111 const CXXScopeSpec &SS, 7112 SourceLocation NameLoc) { 7113 DeclContext *NamedContext = computeDeclContext(SS); 7114 7115 if (!CurContext->isRecord()) { 7116 // C++03 [namespace.udecl]p3: 7117 // C++0x [namespace.udecl]p8: 7118 // A using-declaration for a class member shall be a member-declaration. 7119 7120 // If we weren't able to compute a valid scope, it must be a 7121 // dependent class scope. 7122 if (!NamedContext || NamedContext->isRecord()) { 7123 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 7124 << SS.getRange(); 7125 return true; 7126 } 7127 7128 // Otherwise, everything is known to be fine. 7129 return false; 7130 } 7131 7132 // The current scope is a record. 7133 7134 // If the named context is dependent, we can't decide much. 7135 if (!NamedContext) { 7136 // FIXME: in C++0x, we can diagnose if we can prove that the 7137 // nested-name-specifier does not refer to a base class, which is 7138 // still possible in some cases. 7139 7140 // Otherwise we have to conservatively report that things might be 7141 // okay. 7142 return false; 7143 } 7144 7145 if (!NamedContext->isRecord()) { 7146 // Ideally this would point at the last name in the specifier, 7147 // but we don't have that level of source info. 7148 Diag(SS.getRange().getBegin(), 7149 diag::err_using_decl_nested_name_specifier_is_not_class) 7150 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 7151 return true; 7152 } 7153 7154 if (!NamedContext->isDependentContext() && 7155 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 7156 return true; 7157 7158 if (getLangOpts().CPlusPlus11) { 7159 // C++0x [namespace.udecl]p3: 7160 // In a using-declaration used as a member-declaration, the 7161 // nested-name-specifier shall name a base class of the class 7162 // being defined. 7163 7164 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 7165 cast<CXXRecordDecl>(NamedContext))) { 7166 if (CurContext == NamedContext) { 7167 Diag(NameLoc, 7168 diag::err_using_decl_nested_name_specifier_is_current_class) 7169 << SS.getRange(); 7170 return true; 7171 } 7172 7173 Diag(SS.getRange().getBegin(), 7174 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7175 << (NestedNameSpecifier*) SS.getScopeRep() 7176 << cast<CXXRecordDecl>(CurContext) 7177 << SS.getRange(); 7178 return true; 7179 } 7180 7181 return false; 7182 } 7183 7184 // C++03 [namespace.udecl]p4: 7185 // A using-declaration used as a member-declaration shall refer 7186 // to a member of a base class of the class being defined [etc.]. 7187 7188 // Salient point: SS doesn't have to name a base class as long as 7189 // lookup only finds members from base classes. Therefore we can 7190 // diagnose here only if we can prove that that can't happen, 7191 // i.e. if the class hierarchies provably don't intersect. 7192 7193 // TODO: it would be nice if "definitely valid" results were cached 7194 // in the UsingDecl and UsingShadowDecl so that these checks didn't 7195 // need to be repeated. 7196 7197 struct UserData { 7198 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 7199 7200 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 7201 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7202 Data->Bases.insert(Base); 7203 return true; 7204 } 7205 7206 bool hasDependentBases(const CXXRecordDecl *Class) { 7207 return !Class->forallBases(collect, this); 7208 } 7209 7210 /// Returns true if the base is dependent or is one of the 7211 /// accumulated base classes. 7212 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 7213 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7214 return !Data->Bases.count(Base); 7215 } 7216 7217 bool mightShareBases(const CXXRecordDecl *Class) { 7218 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 7219 } 7220 }; 7221 7222 UserData Data; 7223 7224 // Returns false if we find a dependent base. 7225 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 7226 return false; 7227 7228 // Returns false if the class has a dependent base or if it or one 7229 // of its bases is present in the base set of the current context. 7230 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 7231 return false; 7232 7233 Diag(SS.getRange().getBegin(), 7234 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7235 << (NestedNameSpecifier*) SS.getScopeRep() 7236 << cast<CXXRecordDecl>(CurContext) 7237 << SS.getRange(); 7238 7239 return true; 7240} 7241 7242Decl *Sema::ActOnAliasDeclaration(Scope *S, 7243 AccessSpecifier AS, 7244 MultiTemplateParamsArg TemplateParamLists, 7245 SourceLocation UsingLoc, 7246 UnqualifiedId &Name, 7247 AttributeList *AttrList, 7248 TypeResult Type) { 7249 // Skip up to the relevant declaration scope. 7250 while (S->getFlags() & Scope::TemplateParamScope) 7251 S = S->getParent(); 7252 assert((S->getFlags() & Scope::DeclScope) && 7253 "got alias-declaration outside of declaration scope"); 7254 7255 if (Type.isInvalid()) 7256 return 0; 7257 7258 bool Invalid = false; 7259 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 7260 TypeSourceInfo *TInfo = 0; 7261 GetTypeFromParser(Type.get(), &TInfo); 7262 7263 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 7264 return 0; 7265 7266 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 7267 UPPC_DeclarationType)) { 7268 Invalid = true; 7269 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 7270 TInfo->getTypeLoc().getBeginLoc()); 7271 } 7272 7273 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 7274 LookupName(Previous, S); 7275 7276 // Warn about shadowing the name of a template parameter. 7277 if (Previous.isSingleResult() && 7278 Previous.getFoundDecl()->isTemplateParameter()) { 7279 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 7280 Previous.clear(); 7281 } 7282 7283 assert(Name.Kind == UnqualifiedId::IK_Identifier && 7284 "name in alias declaration must be an identifier"); 7285 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 7286 Name.StartLocation, 7287 Name.Identifier, TInfo); 7288 7289 NewTD->setAccess(AS); 7290 7291 if (Invalid) 7292 NewTD->setInvalidDecl(); 7293 7294 ProcessDeclAttributeList(S, NewTD, AttrList); 7295 7296 CheckTypedefForVariablyModifiedType(S, NewTD); 7297 Invalid |= NewTD->isInvalidDecl(); 7298 7299 bool Redeclaration = false; 7300 7301 NamedDecl *NewND; 7302 if (TemplateParamLists.size()) { 7303 TypeAliasTemplateDecl *OldDecl = 0; 7304 TemplateParameterList *OldTemplateParams = 0; 7305 7306 if (TemplateParamLists.size() != 1) { 7307 Diag(UsingLoc, diag::err_alias_template_extra_headers) 7308 << SourceRange(TemplateParamLists[1]->getTemplateLoc(), 7309 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); 7310 } 7311 TemplateParameterList *TemplateParams = TemplateParamLists[0]; 7312 7313 // Only consider previous declarations in the same scope. 7314 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 7315 /*ExplicitInstantiationOrSpecialization*/false); 7316 if (!Previous.empty()) { 7317 Redeclaration = true; 7318 7319 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 7320 if (!OldDecl && !Invalid) { 7321 Diag(UsingLoc, diag::err_redefinition_different_kind) 7322 << Name.Identifier; 7323 7324 NamedDecl *OldD = Previous.getRepresentativeDecl(); 7325 if (OldD->getLocation().isValid()) 7326 Diag(OldD->getLocation(), diag::note_previous_definition); 7327 7328 Invalid = true; 7329 } 7330 7331 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 7332 if (TemplateParameterListsAreEqual(TemplateParams, 7333 OldDecl->getTemplateParameters(), 7334 /*Complain=*/true, 7335 TPL_TemplateMatch)) 7336 OldTemplateParams = OldDecl->getTemplateParameters(); 7337 else 7338 Invalid = true; 7339 7340 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 7341 if (!Invalid && 7342 !Context.hasSameType(OldTD->getUnderlyingType(), 7343 NewTD->getUnderlyingType())) { 7344 // FIXME: The C++0x standard does not clearly say this is ill-formed, 7345 // but we can't reasonably accept it. 7346 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 7347 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 7348 if (OldTD->getLocation().isValid()) 7349 Diag(OldTD->getLocation(), diag::note_previous_definition); 7350 Invalid = true; 7351 } 7352 } 7353 } 7354 7355 // Merge any previous default template arguments into our parameters, 7356 // and check the parameter list. 7357 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 7358 TPC_TypeAliasTemplate)) 7359 return 0; 7360 7361 TypeAliasTemplateDecl *NewDecl = 7362 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 7363 Name.Identifier, TemplateParams, 7364 NewTD); 7365 7366 NewDecl->setAccess(AS); 7367 7368 if (Invalid) 7369 NewDecl->setInvalidDecl(); 7370 else if (OldDecl) 7371 NewDecl->setPreviousDeclaration(OldDecl); 7372 7373 NewND = NewDecl; 7374 } else { 7375 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 7376 NewND = NewTD; 7377 } 7378 7379 if (!Redeclaration) 7380 PushOnScopeChains(NewND, S); 7381 7382 ActOnDocumentableDecl(NewND); 7383 return NewND; 7384} 7385 7386Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 7387 SourceLocation NamespaceLoc, 7388 SourceLocation AliasLoc, 7389 IdentifierInfo *Alias, 7390 CXXScopeSpec &SS, 7391 SourceLocation IdentLoc, 7392 IdentifierInfo *Ident) { 7393 7394 // Lookup the namespace name. 7395 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 7396 LookupParsedName(R, S, &SS); 7397 7398 // Check if we have a previous declaration with the same name. 7399 NamedDecl *PrevDecl 7400 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 7401 ForRedeclaration); 7402 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 7403 PrevDecl = 0; 7404 7405 if (PrevDecl) { 7406 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 7407 // We already have an alias with the same name that points to the same 7408 // namespace, so don't create a new one. 7409 // FIXME: At some point, we'll want to create the (redundant) 7410 // declaration to maintain better source information. 7411 if (!R.isAmbiguous() && !R.empty() && 7412 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 7413 return 0; 7414 } 7415 7416 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 7417 diag::err_redefinition_different_kind; 7418 Diag(AliasLoc, DiagID) << Alias; 7419 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7420 return 0; 7421 } 7422 7423 if (R.isAmbiguous()) 7424 return 0; 7425 7426 if (R.empty()) { 7427 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 7428 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 7429 return 0; 7430 } 7431 } 7432 7433 NamespaceAliasDecl *AliasDecl = 7434 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 7435 Alias, SS.getWithLocInContext(Context), 7436 IdentLoc, R.getFoundDecl()); 7437 7438 PushOnScopeChains(AliasDecl, S); 7439 return AliasDecl; 7440} 7441 7442Sema::ImplicitExceptionSpecification 7443Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 7444 CXXMethodDecl *MD) { 7445 CXXRecordDecl *ClassDecl = MD->getParent(); 7446 7447 // C++ [except.spec]p14: 7448 // An implicitly declared special member function (Clause 12) shall have an 7449 // exception-specification. [...] 7450 ImplicitExceptionSpecification ExceptSpec(*this); 7451 if (ClassDecl->isInvalidDecl()) 7452 return ExceptSpec; 7453 7454 // Direct base-class constructors. 7455 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7456 BEnd = ClassDecl->bases_end(); 7457 B != BEnd; ++B) { 7458 if (B->isVirtual()) // Handled below. 7459 continue; 7460 7461 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7462 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7463 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7464 // If this is a deleted function, add it anyway. This might be conformant 7465 // with the standard. This might not. I'm not sure. It might not matter. 7466 if (Constructor) 7467 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7468 } 7469 } 7470 7471 // Virtual base-class constructors. 7472 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7473 BEnd = ClassDecl->vbases_end(); 7474 B != BEnd; ++B) { 7475 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7476 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7477 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7478 // If this is a deleted function, add it anyway. This might be conformant 7479 // with the standard. This might not. I'm not sure. It might not matter. 7480 if (Constructor) 7481 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7482 } 7483 } 7484 7485 // Field constructors. 7486 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7487 FEnd = ClassDecl->field_end(); 7488 F != FEnd; ++F) { 7489 if (F->hasInClassInitializer()) { 7490 if (Expr *E = F->getInClassInitializer()) 7491 ExceptSpec.CalledExpr(E); 7492 else if (!F->isInvalidDecl()) 7493 // DR1351: 7494 // If the brace-or-equal-initializer of a non-static data member 7495 // invokes a defaulted default constructor of its class or of an 7496 // enclosing class in a potentially evaluated subexpression, the 7497 // program is ill-formed. 7498 // 7499 // This resolution is unworkable: the exception specification of the 7500 // default constructor can be needed in an unevaluated context, in 7501 // particular, in the operand of a noexcept-expression, and we can be 7502 // unable to compute an exception specification for an enclosed class. 7503 // 7504 // We do not allow an in-class initializer to require the evaluation 7505 // of the exception specification for any in-class initializer whose 7506 // definition is not lexically complete. 7507 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 7508 } else if (const RecordType *RecordTy 7509 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 7510 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7511 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 7512 // If this is a deleted function, add it anyway. This might be conformant 7513 // with the standard. This might not. I'm not sure. It might not matter. 7514 // In particular, the problem is that this function never gets called. It 7515 // might just be ill-formed because this function attempts to refer to 7516 // a deleted function here. 7517 if (Constructor) 7518 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 7519 } 7520 } 7521 7522 return ExceptSpec; 7523} 7524 7525Sema::ImplicitExceptionSpecification 7526Sema::ComputeInheritingCtorExceptionSpec(CXXConstructorDecl *CD) { 7527 CXXRecordDecl *ClassDecl = CD->getParent(); 7528 7529 // C++ [except.spec]p14: 7530 // An inheriting constructor [...] shall have an exception-specification. [...] 7531 ImplicitExceptionSpecification ExceptSpec(*this); 7532 if (ClassDecl->isInvalidDecl()) 7533 return ExceptSpec; 7534 7535 // Inherited constructor. 7536 const CXXConstructorDecl *InheritedCD = CD->getInheritedConstructor(); 7537 const CXXRecordDecl *InheritedDecl = InheritedCD->getParent(); 7538 // FIXME: Copying or moving the parameters could add extra exceptions to the 7539 // set, as could the default arguments for the inherited constructor. This 7540 // will be addressed when we implement the resolution of core issue 1351. 7541 ExceptSpec.CalledDecl(CD->getLocStart(), InheritedCD); 7542 7543 // Direct base-class constructors. 7544 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7545 BEnd = ClassDecl->bases_end(); 7546 B != BEnd; ++B) { 7547 if (B->isVirtual()) // Handled below. 7548 continue; 7549 7550 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7551 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7552 if (BaseClassDecl == InheritedDecl) 7553 continue; 7554 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7555 if (Constructor) 7556 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7557 } 7558 } 7559 7560 // Virtual base-class constructors. 7561 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7562 BEnd = ClassDecl->vbases_end(); 7563 B != BEnd; ++B) { 7564 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7565 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7566 if (BaseClassDecl == InheritedDecl) 7567 continue; 7568 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7569 if (Constructor) 7570 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7571 } 7572 } 7573 7574 // Field constructors. 7575 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7576 FEnd = ClassDecl->field_end(); 7577 F != FEnd; ++F) { 7578 if (F->hasInClassInitializer()) { 7579 if (Expr *E = F->getInClassInitializer()) 7580 ExceptSpec.CalledExpr(E); 7581 else if (!F->isInvalidDecl()) 7582 Diag(CD->getLocation(), 7583 diag::err_in_class_initializer_references_def_ctor) << CD; 7584 } else if (const RecordType *RecordTy 7585 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 7586 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7587 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 7588 if (Constructor) 7589 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 7590 } 7591 } 7592 7593 return ExceptSpec; 7594} 7595 7596namespace { 7597/// RAII object to register a special member as being currently declared. 7598struct DeclaringSpecialMember { 7599 Sema &S; 7600 Sema::SpecialMemberDecl D; 7601 bool WasAlreadyBeingDeclared; 7602 7603 DeclaringSpecialMember(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM) 7604 : S(S), D(RD, CSM) { 7605 WasAlreadyBeingDeclared = !S.SpecialMembersBeingDeclared.insert(D); 7606 if (WasAlreadyBeingDeclared) 7607 // This almost never happens, but if it does, ensure that our cache 7608 // doesn't contain a stale result. 7609 S.SpecialMemberCache.clear(); 7610 7611 // FIXME: Register a note to be produced if we encounter an error while 7612 // declaring the special member. 7613 } 7614 ~DeclaringSpecialMember() { 7615 if (!WasAlreadyBeingDeclared) 7616 S.SpecialMembersBeingDeclared.erase(D); 7617 } 7618 7619 /// \brief Are we already trying to declare this special member? 7620 bool isAlreadyBeingDeclared() const { 7621 return WasAlreadyBeingDeclared; 7622 } 7623}; 7624} 7625 7626CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 7627 CXXRecordDecl *ClassDecl) { 7628 // C++ [class.ctor]p5: 7629 // A default constructor for a class X is a constructor of class X 7630 // that can be called without an argument. If there is no 7631 // user-declared constructor for class X, a default constructor is 7632 // implicitly declared. An implicitly-declared default constructor 7633 // is an inline public member of its class. 7634 assert(ClassDecl->needsImplicitDefaultConstructor() && 7635 "Should not build implicit default constructor!"); 7636 7637 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDefaultConstructor); 7638 if (DSM.isAlreadyBeingDeclared()) 7639 return 0; 7640 7641 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 7642 CXXDefaultConstructor, 7643 false); 7644 7645 // Create the actual constructor declaration. 7646 CanQualType ClassType 7647 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7648 SourceLocation ClassLoc = ClassDecl->getLocation(); 7649 DeclarationName Name 7650 = Context.DeclarationNames.getCXXConstructorName(ClassType); 7651 DeclarationNameInfo NameInfo(Name, ClassLoc); 7652 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 7653 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 7654 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 7655 Constexpr); 7656 DefaultCon->setAccess(AS_public); 7657 DefaultCon->setDefaulted(); 7658 DefaultCon->setImplicit(); 7659 7660 // Build an exception specification pointing back at this constructor. 7661 FunctionProtoType::ExtProtoInfo EPI; 7662 EPI.ExceptionSpecType = EST_Unevaluated; 7663 EPI.ExceptionSpecDecl = DefaultCon; 7664 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, 7665 ArrayRef<QualType>(), 7666 EPI)); 7667 7668 // We don't need to use SpecialMemberIsTrivial here; triviality for default 7669 // constructors is easy to compute. 7670 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 7671 7672 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 7673 SetDeclDeleted(DefaultCon, ClassLoc); 7674 7675 // Note that we have declared this constructor. 7676 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 7677 7678 if (Scope *S = getScopeForContext(ClassDecl)) 7679 PushOnScopeChains(DefaultCon, S, false); 7680 ClassDecl->addDecl(DefaultCon); 7681 7682 return DefaultCon; 7683} 7684 7685void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 7686 CXXConstructorDecl *Constructor) { 7687 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 7688 !Constructor->doesThisDeclarationHaveABody() && 7689 !Constructor->isDeleted()) && 7690 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 7691 7692 CXXRecordDecl *ClassDecl = Constructor->getParent(); 7693 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 7694 7695 SynthesizedFunctionScope Scope(*this, Constructor); 7696 DiagnosticErrorTrap Trap(Diags); 7697 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) || 7698 Trap.hasErrorOccurred()) { 7699 Diag(CurrentLocation, diag::note_member_synthesized_at) 7700 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 7701 Constructor->setInvalidDecl(); 7702 return; 7703 } 7704 7705 SourceLocation Loc = Constructor->getLocation(); 7706 Constructor->setBody(new (Context) CompoundStmt(Loc)); 7707 7708 Constructor->setUsed(); 7709 MarkVTableUsed(CurrentLocation, ClassDecl); 7710 7711 if (ASTMutationListener *L = getASTMutationListener()) { 7712 L->CompletedImplicitDefinition(Constructor); 7713 } 7714} 7715 7716void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 7717 // Check that any explicitly-defaulted methods have exception specifications 7718 // compatible with their implicit exception specifications. 7719 CheckDelayedExplicitlyDefaultedMemberExceptionSpecs(); 7720} 7721 7722namespace { 7723/// Information on inheriting constructors to declare. 7724class InheritingConstructorInfo { 7725public: 7726 InheritingConstructorInfo(Sema &SemaRef, CXXRecordDecl *Derived) 7727 : SemaRef(SemaRef), Derived(Derived) { 7728 // Mark the constructors that we already have in the derived class. 7729 // 7730 // C++11 [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7731 // unless there is a user-declared constructor with the same signature in 7732 // the class where the using-declaration appears. 7733 visitAll(Derived, &InheritingConstructorInfo::noteDeclaredInDerived); 7734 } 7735 7736 void inheritAll(CXXRecordDecl *RD) { 7737 visitAll(RD, &InheritingConstructorInfo::inherit); 7738 } 7739 7740private: 7741 /// Information about an inheriting constructor. 7742 struct InheritingConstructor { 7743 InheritingConstructor() 7744 : DeclaredInDerived(false), BaseCtor(0), DerivedCtor(0) {} 7745 7746 /// If \c true, a constructor with this signature is already declared 7747 /// in the derived class. 7748 bool DeclaredInDerived; 7749 7750 /// The constructor which is inherited. 7751 const CXXConstructorDecl *BaseCtor; 7752 7753 /// The derived constructor we declared. 7754 CXXConstructorDecl *DerivedCtor; 7755 }; 7756 7757 /// Inheriting constructors with a given canonical type. There can be at 7758 /// most one such non-template constructor, and any number of templated 7759 /// constructors. 7760 struct InheritingConstructorsForType { 7761 InheritingConstructor NonTemplate; 7762 llvm::SmallVector< 7763 std::pair<TemplateParameterList*, InheritingConstructor>, 4> Templates; 7764 7765 InheritingConstructor &getEntry(Sema &S, const CXXConstructorDecl *Ctor) { 7766 if (FunctionTemplateDecl *FTD = Ctor->getDescribedFunctionTemplate()) { 7767 TemplateParameterList *ParamList = FTD->getTemplateParameters(); 7768 for (unsigned I = 0, N = Templates.size(); I != N; ++I) 7769 if (S.TemplateParameterListsAreEqual(ParamList, Templates[I].first, 7770 false, S.TPL_TemplateMatch)) 7771 return Templates[I].second; 7772 Templates.push_back(std::make_pair(ParamList, InheritingConstructor())); 7773 return Templates.back().second; 7774 } 7775 7776 return NonTemplate; 7777 } 7778 }; 7779 7780 /// Get or create the inheriting constructor record for a constructor. 7781 InheritingConstructor &getEntry(const CXXConstructorDecl *Ctor, 7782 QualType CtorType) { 7783 return Map[CtorType.getCanonicalType()->castAs<FunctionProtoType>()] 7784 .getEntry(SemaRef, Ctor); 7785 } 7786 7787 typedef void (InheritingConstructorInfo::*VisitFn)(const CXXConstructorDecl*); 7788 7789 /// Process all constructors for a class. 7790 void visitAll(const CXXRecordDecl *RD, VisitFn Callback) { 7791 for (CXXRecordDecl::ctor_iterator CtorIt = RD->ctor_begin(), 7792 CtorE = RD->ctor_end(); 7793 CtorIt != CtorE; ++CtorIt) 7794 (this->*Callback)(*CtorIt); 7795 for (CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> 7796 I(RD->decls_begin()), E(RD->decls_end()); 7797 I != E; ++I) { 7798 const FunctionDecl *FD = (*I)->getTemplatedDecl(); 7799 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) 7800 (this->*Callback)(CD); 7801 } 7802 } 7803 7804 /// Note that a constructor (or constructor template) was declared in Derived. 7805 void noteDeclaredInDerived(const CXXConstructorDecl *Ctor) { 7806 getEntry(Ctor, Ctor->getType()).DeclaredInDerived = true; 7807 } 7808 7809 /// Inherit a single constructor. 7810 void inherit(const CXXConstructorDecl *Ctor) { 7811 const FunctionProtoType *CtorType = 7812 Ctor->getType()->castAs<FunctionProtoType>(); 7813 ArrayRef<QualType> ArgTypes(CtorType->getArgTypes()); 7814 FunctionProtoType::ExtProtoInfo EPI = CtorType->getExtProtoInfo(); 7815 7816 SourceLocation UsingLoc = getUsingLoc(Ctor->getParent()); 7817 7818 // Core issue (no number yet): the ellipsis is always discarded. 7819 if (EPI.Variadic) { 7820 SemaRef.Diag(UsingLoc, diag::warn_using_decl_constructor_ellipsis); 7821 SemaRef.Diag(Ctor->getLocation(), 7822 diag::note_using_decl_constructor_ellipsis); 7823 EPI.Variadic = false; 7824 } 7825 7826 // Declare a constructor for each number of parameters. 7827 // 7828 // C++11 [class.inhctor]p1: 7829 // The candidate set of inherited constructors from the class X named in 7830 // the using-declaration consists of [... modulo defects ...] for each 7831 // constructor or constructor template of X, the set of constructors or 7832 // constructor templates that results from omitting any ellipsis parameter 7833 // specification and successively omitting parameters with a default 7834 // argument from the end of the parameter-type-list 7835 for (unsigned Params = std::max(minParamsToInherit(Ctor), 7836 Ctor->getMinRequiredArguments()), 7837 MaxParams = Ctor->getNumParams(); 7838 Params <= MaxParams; ++Params) 7839 declareCtor(UsingLoc, Ctor, 7840 SemaRef.Context.getFunctionType( 7841 Ctor->getResultType(), ArgTypes.slice(0, Params), EPI)); 7842 } 7843 7844 /// Find the using-declaration which specified that we should inherit the 7845 /// constructors of \p Base. 7846 SourceLocation getUsingLoc(const CXXRecordDecl *Base) { 7847 // No fancy lookup required; just look for the base constructor name 7848 // directly within the derived class. 7849 ASTContext &Context = SemaRef.Context; 7850 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 7851 Context.getCanonicalType(Context.getRecordType(Base))); 7852 DeclContext::lookup_const_result Decls = Derived->lookup(Name); 7853 return Decls.empty() ? Derived->getLocation() : Decls[0]->getLocation(); 7854 } 7855 7856 unsigned minParamsToInherit(const CXXConstructorDecl *Ctor) { 7857 // C++11 [class.inhctor]p3: 7858 // [F]or each constructor template in the candidate set of inherited 7859 // constructors, a constructor template is implicitly declared 7860 if (Ctor->getDescribedFunctionTemplate()) 7861 return 0; 7862 7863 // For each non-template constructor in the candidate set of inherited 7864 // constructors other than a constructor having no parameters or a 7865 // copy/move constructor having a single parameter, a constructor is 7866 // implicitly declared [...] 7867 if (Ctor->getNumParams() == 0) 7868 return 1; 7869 if (Ctor->isCopyOrMoveConstructor()) 7870 return 2; 7871 7872 // Per discussion on core reflector, never inherit a constructor which 7873 // would become a default, copy, or move constructor of Derived either. 7874 const ParmVarDecl *PD = Ctor->getParamDecl(0); 7875 const ReferenceType *RT = PD->getType()->getAs<ReferenceType>(); 7876 return (RT && RT->getPointeeCXXRecordDecl() == Derived) ? 2 : 1; 7877 } 7878 7879 /// Declare a single inheriting constructor, inheriting the specified 7880 /// constructor, with the given type. 7881 void declareCtor(SourceLocation UsingLoc, const CXXConstructorDecl *BaseCtor, 7882 QualType DerivedType) { 7883 InheritingConstructor &Entry = getEntry(BaseCtor, DerivedType); 7884 7885 // C++11 [class.inhctor]p3: 7886 // ... a constructor is implicitly declared with the same constructor 7887 // characteristics unless there is a user-declared constructor with 7888 // the same signature in the class where the using-declaration appears 7889 if (Entry.DeclaredInDerived) 7890 return; 7891 7892 // C++11 [class.inhctor]p7: 7893 // If two using-declarations declare inheriting constructors with the 7894 // same signature, the program is ill-formed 7895 if (Entry.DerivedCtor) { 7896 if (BaseCtor->getParent() != Entry.BaseCtor->getParent()) { 7897 // Only diagnose this once per constructor. 7898 if (Entry.DerivedCtor->isInvalidDecl()) 7899 return; 7900 Entry.DerivedCtor->setInvalidDecl(); 7901 7902 SemaRef.Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7903 SemaRef.Diag(BaseCtor->getLocation(), 7904 diag::note_using_decl_constructor_conflict_current_ctor); 7905 SemaRef.Diag(Entry.BaseCtor->getLocation(), 7906 diag::note_using_decl_constructor_conflict_previous_ctor); 7907 SemaRef.Diag(Entry.DerivedCtor->getLocation(), 7908 diag::note_using_decl_constructor_conflict_previous_using); 7909 } else { 7910 // Core issue (no number): if the same inheriting constructor is 7911 // produced by multiple base class constructors from the same base 7912 // class, the inheriting constructor is defined as deleted. 7913 SemaRef.SetDeclDeleted(Entry.DerivedCtor, UsingLoc); 7914 } 7915 7916 return; 7917 } 7918 7919 ASTContext &Context = SemaRef.Context; 7920 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 7921 Context.getCanonicalType(Context.getRecordType(Derived))); 7922 DeclarationNameInfo NameInfo(Name, UsingLoc); 7923 7924 TemplateParameterList *TemplateParams = 0; 7925 if (const FunctionTemplateDecl *FTD = 7926 BaseCtor->getDescribedFunctionTemplate()) { 7927 TemplateParams = FTD->getTemplateParameters(); 7928 // We're reusing template parameters from a different DeclContext. This 7929 // is questionable at best, but works out because the template depth in 7930 // both places is guaranteed to be 0. 7931 // FIXME: Rebuild the template parameters in the new context, and 7932 // transform the function type to refer to them. 7933 } 7934 7935 // Build type source info pointing at the using-declaration. This is 7936 // required by template instantiation. 7937 TypeSourceInfo *TInfo = 7938 Context.getTrivialTypeSourceInfo(DerivedType, UsingLoc); 7939 FunctionProtoTypeLoc ProtoLoc = 7940 TInfo->getTypeLoc().IgnoreParens().castAs<FunctionProtoTypeLoc>(); 7941 7942 CXXConstructorDecl *DerivedCtor = CXXConstructorDecl::Create( 7943 Context, Derived, UsingLoc, NameInfo, DerivedType, 7944 TInfo, BaseCtor->isExplicit(), /*Inline=*/true, 7945 /*ImplicitlyDeclared=*/true, /*Constexpr=*/BaseCtor->isConstexpr()); 7946 7947 // Build an unevaluated exception specification for this constructor. 7948 const FunctionProtoType *FPT = DerivedType->castAs<FunctionProtoType>(); 7949 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 7950 EPI.ExceptionSpecType = EST_Unevaluated; 7951 EPI.ExceptionSpecDecl = DerivedCtor; 7952 DerivedCtor->setType(Context.getFunctionType(FPT->getResultType(), 7953 FPT->getArgTypes(), EPI)); 7954 7955 // Build the parameter declarations. 7956 SmallVector<ParmVarDecl *, 16> ParamDecls; 7957 for (unsigned I = 0, N = FPT->getNumArgs(); I != N; ++I) { 7958 TypeSourceInfo *TInfo = 7959 Context.getTrivialTypeSourceInfo(FPT->getArgType(I), UsingLoc); 7960 ParmVarDecl *PD = ParmVarDecl::Create( 7961 Context, DerivedCtor, UsingLoc, UsingLoc, /*IdentifierInfo=*/0, 7962 FPT->getArgType(I), TInfo, SC_None, /*DefaultArg=*/0); 7963 PD->setScopeInfo(0, I); 7964 PD->setImplicit(); 7965 ParamDecls.push_back(PD); 7966 ProtoLoc.setArg(I, PD); 7967 } 7968 7969 // Set up the new constructor. 7970 DerivedCtor->setAccess(BaseCtor->getAccess()); 7971 DerivedCtor->setParams(ParamDecls); 7972 DerivedCtor->setInheritedConstructor(BaseCtor); 7973 if (BaseCtor->isDeleted()) 7974 SemaRef.SetDeclDeleted(DerivedCtor, UsingLoc); 7975 7976 // If this is a constructor template, build the template declaration. 7977 if (TemplateParams) { 7978 FunctionTemplateDecl *DerivedTemplate = 7979 FunctionTemplateDecl::Create(SemaRef.Context, Derived, UsingLoc, Name, 7980 TemplateParams, DerivedCtor); 7981 DerivedTemplate->setAccess(BaseCtor->getAccess()); 7982 DerivedCtor->setDescribedFunctionTemplate(DerivedTemplate); 7983 Derived->addDecl(DerivedTemplate); 7984 } else { 7985 Derived->addDecl(DerivedCtor); 7986 } 7987 7988 Entry.BaseCtor = BaseCtor; 7989 Entry.DerivedCtor = DerivedCtor; 7990 } 7991 7992 Sema &SemaRef; 7993 CXXRecordDecl *Derived; 7994 typedef llvm::DenseMap<const Type *, InheritingConstructorsForType> MapType; 7995 MapType Map; 7996}; 7997} 7998 7999void Sema::DeclareInheritingConstructors(CXXRecordDecl *ClassDecl) { 8000 // Defer declaring the inheriting constructors until the class is 8001 // instantiated. 8002 if (ClassDecl->isDependentContext()) 8003 return; 8004 8005 // Find base classes from which we might inherit constructors. 8006 SmallVector<CXXRecordDecl*, 4> InheritedBases; 8007 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 8008 BaseE = ClassDecl->bases_end(); 8009 BaseIt != BaseE; ++BaseIt) 8010 if (BaseIt->getInheritConstructors()) 8011 InheritedBases.push_back(BaseIt->getType()->getAsCXXRecordDecl()); 8012 8013 // Go no further if we're not inheriting any constructors. 8014 if (InheritedBases.empty()) 8015 return; 8016 8017 // Declare the inherited constructors. 8018 InheritingConstructorInfo ICI(*this, ClassDecl); 8019 for (unsigned I = 0, N = InheritedBases.size(); I != N; ++I) 8020 ICI.inheritAll(InheritedBases[I]); 8021} 8022 8023void Sema::DefineInheritingConstructor(SourceLocation CurrentLocation, 8024 CXXConstructorDecl *Constructor) { 8025 CXXRecordDecl *ClassDecl = Constructor->getParent(); 8026 assert(Constructor->getInheritedConstructor() && 8027 !Constructor->doesThisDeclarationHaveABody() && 8028 !Constructor->isDeleted()); 8029 8030 SynthesizedFunctionScope Scope(*this, Constructor); 8031 DiagnosticErrorTrap Trap(Diags); 8032 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) || 8033 Trap.hasErrorOccurred()) { 8034 Diag(CurrentLocation, diag::note_inhctor_synthesized_at) 8035 << Context.getTagDeclType(ClassDecl); 8036 Constructor->setInvalidDecl(); 8037 return; 8038 } 8039 8040 SourceLocation Loc = Constructor->getLocation(); 8041 Constructor->setBody(new (Context) CompoundStmt(Loc)); 8042 8043 Constructor->setUsed(); 8044 MarkVTableUsed(CurrentLocation, ClassDecl); 8045 8046 if (ASTMutationListener *L = getASTMutationListener()) { 8047 L->CompletedImplicitDefinition(Constructor); 8048 } 8049} 8050 8051 8052Sema::ImplicitExceptionSpecification 8053Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 8054 CXXRecordDecl *ClassDecl = MD->getParent(); 8055 8056 // C++ [except.spec]p14: 8057 // An implicitly declared special member function (Clause 12) shall have 8058 // an exception-specification. 8059 ImplicitExceptionSpecification ExceptSpec(*this); 8060 if (ClassDecl->isInvalidDecl()) 8061 return ExceptSpec; 8062 8063 // Direct base-class destructors. 8064 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8065 BEnd = ClassDecl->bases_end(); 8066 B != BEnd; ++B) { 8067 if (B->isVirtual()) // Handled below. 8068 continue; 8069 8070 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 8071 ExceptSpec.CalledDecl(B->getLocStart(), 8072 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 8073 } 8074 8075 // Virtual base-class destructors. 8076 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8077 BEnd = ClassDecl->vbases_end(); 8078 B != BEnd; ++B) { 8079 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 8080 ExceptSpec.CalledDecl(B->getLocStart(), 8081 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 8082 } 8083 8084 // Field destructors. 8085 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8086 FEnd = ClassDecl->field_end(); 8087 F != FEnd; ++F) { 8088 if (const RecordType *RecordTy 8089 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 8090 ExceptSpec.CalledDecl(F->getLocation(), 8091 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 8092 } 8093 8094 return ExceptSpec; 8095} 8096 8097CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 8098 // C++ [class.dtor]p2: 8099 // If a class has no user-declared destructor, a destructor is 8100 // declared implicitly. An implicitly-declared destructor is an 8101 // inline public member of its class. 8102 assert(ClassDecl->needsImplicitDestructor()); 8103 8104 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDestructor); 8105 if (DSM.isAlreadyBeingDeclared()) 8106 return 0; 8107 8108 // Create the actual destructor declaration. 8109 CanQualType ClassType 8110 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 8111 SourceLocation ClassLoc = ClassDecl->getLocation(); 8112 DeclarationName Name 8113 = Context.DeclarationNames.getCXXDestructorName(ClassType); 8114 DeclarationNameInfo NameInfo(Name, ClassLoc); 8115 CXXDestructorDecl *Destructor 8116 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8117 QualType(), 0, /*isInline=*/true, 8118 /*isImplicitlyDeclared=*/true); 8119 Destructor->setAccess(AS_public); 8120 Destructor->setDefaulted(); 8121 Destructor->setImplicit(); 8122 8123 // Build an exception specification pointing back at this destructor. 8124 FunctionProtoType::ExtProtoInfo EPI; 8125 EPI.ExceptionSpecType = EST_Unevaluated; 8126 EPI.ExceptionSpecDecl = Destructor; 8127 Destructor->setType(Context.getFunctionType(Context.VoidTy, 8128 ArrayRef<QualType>(), 8129 EPI)); 8130 8131 AddOverriddenMethods(ClassDecl, Destructor); 8132 8133 // We don't need to use SpecialMemberIsTrivial here; triviality for 8134 // destructors is easy to compute. 8135 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 8136 8137 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 8138 SetDeclDeleted(Destructor, ClassLoc); 8139 8140 // Note that we have declared this destructor. 8141 ++ASTContext::NumImplicitDestructorsDeclared; 8142 8143 // Introduce this destructor into its scope. 8144 if (Scope *S = getScopeForContext(ClassDecl)) 8145 PushOnScopeChains(Destructor, S, false); 8146 ClassDecl->addDecl(Destructor); 8147 8148 return Destructor; 8149} 8150 8151void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 8152 CXXDestructorDecl *Destructor) { 8153 assert((Destructor->isDefaulted() && 8154 !Destructor->doesThisDeclarationHaveABody() && 8155 !Destructor->isDeleted()) && 8156 "DefineImplicitDestructor - call it for implicit default dtor"); 8157 CXXRecordDecl *ClassDecl = Destructor->getParent(); 8158 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 8159 8160 if (Destructor->isInvalidDecl()) 8161 return; 8162 8163 SynthesizedFunctionScope Scope(*this, Destructor); 8164 8165 DiagnosticErrorTrap Trap(Diags); 8166 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 8167 Destructor->getParent()); 8168 8169 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 8170 Diag(CurrentLocation, diag::note_member_synthesized_at) 8171 << CXXDestructor << Context.getTagDeclType(ClassDecl); 8172 8173 Destructor->setInvalidDecl(); 8174 return; 8175 } 8176 8177 SourceLocation Loc = Destructor->getLocation(); 8178 Destructor->setBody(new (Context) CompoundStmt(Loc)); 8179 Destructor->setImplicitlyDefined(true); 8180 Destructor->setUsed(); 8181 MarkVTableUsed(CurrentLocation, ClassDecl); 8182 8183 if (ASTMutationListener *L = getASTMutationListener()) { 8184 L->CompletedImplicitDefinition(Destructor); 8185 } 8186} 8187 8188/// \brief Perform any semantic analysis which needs to be delayed until all 8189/// pending class member declarations have been parsed. 8190void Sema::ActOnFinishCXXMemberDecls() { 8191 // If the context is an invalid C++ class, just suppress these checks. 8192 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(CurContext)) { 8193 if (Record->isInvalidDecl()) { 8194 DelayedDestructorExceptionSpecChecks.clear(); 8195 return; 8196 } 8197 } 8198 8199 // Perform any deferred checking of exception specifications for virtual 8200 // destructors. 8201 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 8202 i != e; ++i) { 8203 const CXXDestructorDecl *Dtor = 8204 DelayedDestructorExceptionSpecChecks[i].first; 8205 assert(!Dtor->getParent()->isDependentType() && 8206 "Should not ever add destructors of templates into the list."); 8207 CheckOverridingFunctionExceptionSpec(Dtor, 8208 DelayedDestructorExceptionSpecChecks[i].second); 8209 } 8210 DelayedDestructorExceptionSpecChecks.clear(); 8211} 8212 8213void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 8214 CXXDestructorDecl *Destructor) { 8215 assert(getLangOpts().CPlusPlus11 && 8216 "adjusting dtor exception specs was introduced in c++11"); 8217 8218 // C++11 [class.dtor]p3: 8219 // A declaration of a destructor that does not have an exception- 8220 // specification is implicitly considered to have the same exception- 8221 // specification as an implicit declaration. 8222 const FunctionProtoType *DtorType = Destructor->getType()-> 8223 getAs<FunctionProtoType>(); 8224 if (DtorType->hasExceptionSpec()) 8225 return; 8226 8227 // Replace the destructor's type, building off the existing one. Fortunately, 8228 // the only thing of interest in the destructor type is its extended info. 8229 // The return and arguments are fixed. 8230 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 8231 EPI.ExceptionSpecType = EST_Unevaluated; 8232 EPI.ExceptionSpecDecl = Destructor; 8233 Destructor->setType(Context.getFunctionType(Context.VoidTy, 8234 ArrayRef<QualType>(), 8235 EPI)); 8236 8237 // FIXME: If the destructor has a body that could throw, and the newly created 8238 // spec doesn't allow exceptions, we should emit a warning, because this 8239 // change in behavior can break conforming C++03 programs at runtime. 8240 // However, we don't have a body or an exception specification yet, so it 8241 // needs to be done somewhere else. 8242} 8243 8244/// When generating a defaulted copy or move assignment operator, if a field 8245/// should be copied with __builtin_memcpy rather than via explicit assignments, 8246/// do so. This optimization only applies for arrays of scalars, and for arrays 8247/// of class type where the selected copy/move-assignment operator is trivial. 8248static StmtResult 8249buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T, 8250 Expr *To, Expr *From) { 8251 // Compute the size of the memory buffer to be copied. 8252 QualType SizeType = S.Context.getSizeType(); 8253 llvm::APInt Size(S.Context.getTypeSize(SizeType), 8254 S.Context.getTypeSizeInChars(T).getQuantity()); 8255 8256 // Take the address of the field references for "from" and "to". We 8257 // directly construct UnaryOperators here because semantic analysis 8258 // does not permit us to take the address of an xvalue. 8259 From = new (S.Context) UnaryOperator(From, UO_AddrOf, 8260 S.Context.getPointerType(From->getType()), 8261 VK_RValue, OK_Ordinary, Loc); 8262 To = new (S.Context) UnaryOperator(To, UO_AddrOf, 8263 S.Context.getPointerType(To->getType()), 8264 VK_RValue, OK_Ordinary, Loc); 8265 8266 const Type *E = T->getBaseElementTypeUnsafe(); 8267 bool NeedsCollectableMemCpy = 8268 E->isRecordType() && E->getAs<RecordType>()->getDecl()->hasObjectMember(); 8269 8270 // Create a reference to the __builtin_objc_memmove_collectable function 8271 StringRef MemCpyName = NeedsCollectableMemCpy ? 8272 "__builtin_objc_memmove_collectable" : 8273 "__builtin_memcpy"; 8274 LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc, 8275 Sema::LookupOrdinaryName); 8276 S.LookupName(R, S.TUScope, true); 8277 8278 FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>(); 8279 if (!MemCpy) 8280 // Something went horribly wrong earlier, and we will have complained 8281 // about it. 8282 return StmtError(); 8283 8284 ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy, 8285 VK_RValue, Loc, 0); 8286 assert(MemCpyRef.isUsable() && "Builtin reference cannot fail"); 8287 8288 Expr *CallArgs[] = { 8289 To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc) 8290 }; 8291 ExprResult Call = S.ActOnCallExpr(/*Scope=*/0, MemCpyRef.take(), 8292 Loc, CallArgs, Loc); 8293 8294 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8295 return S.Owned(Call.takeAs<Stmt>()); 8296} 8297 8298/// \brief Builds a statement that copies/moves the given entity from \p From to 8299/// \c To. 8300/// 8301/// This routine is used to copy/move the members of a class with an 8302/// implicitly-declared copy/move assignment operator. When the entities being 8303/// copied are arrays, this routine builds for loops to copy them. 8304/// 8305/// \param S The Sema object used for type-checking. 8306/// 8307/// \param Loc The location where the implicit copy/move is being generated. 8308/// 8309/// \param T The type of the expressions being copied/moved. Both expressions 8310/// must have this type. 8311/// 8312/// \param To The expression we are copying/moving to. 8313/// 8314/// \param From The expression we are copying/moving from. 8315/// 8316/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 8317/// Otherwise, it's a non-static member subobject. 8318/// 8319/// \param Copying Whether we're copying or moving. 8320/// 8321/// \param Depth Internal parameter recording the depth of the recursion. 8322/// 8323/// \returns A statement or a loop that copies the expressions, or StmtResult(0) 8324/// if a memcpy should be used instead. 8325static StmtResult 8326buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T, 8327 Expr *To, Expr *From, 8328 bool CopyingBaseSubobject, bool Copying, 8329 unsigned Depth = 0) { 8330 // C++11 [class.copy]p28: 8331 // Each subobject is assigned in the manner appropriate to its type: 8332 // 8333 // - if the subobject is of class type, as if by a call to operator= with 8334 // the subobject as the object expression and the corresponding 8335 // subobject of x as a single function argument (as if by explicit 8336 // qualification; that is, ignoring any possible virtual overriding 8337 // functions in more derived classes); 8338 // 8339 // C++03 [class.copy]p13: 8340 // - if the subobject is of class type, the copy assignment operator for 8341 // the class is used (as if by explicit qualification; that is, 8342 // ignoring any possible virtual overriding functions in more derived 8343 // classes); 8344 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 8345 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8346 8347 // Look for operator=. 8348 DeclarationName Name 8349 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8350 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 8351 S.LookupQualifiedName(OpLookup, ClassDecl, false); 8352 8353 // Prior to C++11, filter out any result that isn't a copy/move-assignment 8354 // operator. 8355 if (!S.getLangOpts().CPlusPlus11) { 8356 LookupResult::Filter F = OpLookup.makeFilter(); 8357 while (F.hasNext()) { 8358 NamedDecl *D = F.next(); 8359 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 8360 if (Method->isCopyAssignmentOperator() || 8361 (!Copying && Method->isMoveAssignmentOperator())) 8362 continue; 8363 8364 F.erase(); 8365 } 8366 F.done(); 8367 } 8368 8369 // Suppress the protected check (C++ [class.protected]) for each of the 8370 // assignment operators we found. This strange dance is required when 8371 // we're assigning via a base classes's copy-assignment operator. To 8372 // ensure that we're getting the right base class subobject (without 8373 // ambiguities), we need to cast "this" to that subobject type; to 8374 // ensure that we don't go through the virtual call mechanism, we need 8375 // to qualify the operator= name with the base class (see below). However, 8376 // this means that if the base class has a protected copy assignment 8377 // operator, the protected member access check will fail. So, we 8378 // rewrite "protected" access to "public" access in this case, since we 8379 // know by construction that we're calling from a derived class. 8380 if (CopyingBaseSubobject) { 8381 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 8382 L != LEnd; ++L) { 8383 if (L.getAccess() == AS_protected) 8384 L.setAccess(AS_public); 8385 } 8386 } 8387 8388 // Create the nested-name-specifier that will be used to qualify the 8389 // reference to operator=; this is required to suppress the virtual 8390 // call mechanism. 8391 CXXScopeSpec SS; 8392 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 8393 SS.MakeTrivial(S.Context, 8394 NestedNameSpecifier::Create(S.Context, 0, false, 8395 CanonicalT), 8396 Loc); 8397 8398 // Create the reference to operator=. 8399 ExprResult OpEqualRef 8400 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 8401 /*TemplateKWLoc=*/SourceLocation(), 8402 /*FirstQualifierInScope=*/0, 8403 OpLookup, 8404 /*TemplateArgs=*/0, 8405 /*SuppressQualifierCheck=*/true); 8406 if (OpEqualRef.isInvalid()) 8407 return StmtError(); 8408 8409 // Build the call to the assignment operator. 8410 8411 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 8412 OpEqualRef.takeAs<Expr>(), 8413 Loc, &From, 1, Loc); 8414 if (Call.isInvalid()) 8415 return StmtError(); 8416 8417 // If we built a call to a trivial 'operator=' while copying an array, 8418 // bail out. We'll replace the whole shebang with a memcpy. 8419 CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get()); 8420 if (CE && CE->getMethodDecl()->isTrivial() && Depth) 8421 return StmtResult((Stmt*)0); 8422 8423 // Convert to an expression-statement, and clean up any produced 8424 // temporaries. 8425 return S.ActOnExprStmt(Call); 8426 } 8427 8428 // - if the subobject is of scalar type, the built-in assignment 8429 // operator is used. 8430 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 8431 if (!ArrayTy) { 8432 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 8433 if (Assignment.isInvalid()) 8434 return StmtError(); 8435 return S.ActOnExprStmt(Assignment); 8436 } 8437 8438 // - if the subobject is an array, each element is assigned, in the 8439 // manner appropriate to the element type; 8440 8441 // Construct a loop over the array bounds, e.g., 8442 // 8443 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 8444 // 8445 // that will copy each of the array elements. 8446 QualType SizeType = S.Context.getSizeType(); 8447 8448 // Create the iteration variable. 8449 IdentifierInfo *IterationVarName = 0; 8450 { 8451 SmallString<8> Str; 8452 llvm::raw_svector_ostream OS(Str); 8453 OS << "__i" << Depth; 8454 IterationVarName = &S.Context.Idents.get(OS.str()); 8455 } 8456 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 8457 IterationVarName, SizeType, 8458 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 8459 SC_None); 8460 8461 // Initialize the iteration variable to zero. 8462 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 8463 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 8464 8465 // Create a reference to the iteration variable; we'll use this several 8466 // times throughout. 8467 Expr *IterationVarRef 8468 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 8469 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 8470 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 8471 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 8472 8473 // Create the DeclStmt that holds the iteration variable. 8474 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 8475 8476 // Subscript the "from" and "to" expressions with the iteration variable. 8477 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 8478 IterationVarRefRVal, 8479 Loc)); 8480 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 8481 IterationVarRefRVal, 8482 Loc)); 8483 if (!Copying) // Cast to rvalue 8484 From = CastForMoving(S, From); 8485 8486 // Build the copy/move for an individual element of the array. 8487 StmtResult Copy = 8488 buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(), 8489 To, From, CopyingBaseSubobject, 8490 Copying, Depth + 1); 8491 // Bail out if copying fails or if we determined that we should use memcpy. 8492 if (Copy.isInvalid() || !Copy.get()) 8493 return Copy; 8494 8495 // Create the comparison against the array bound. 8496 llvm::APInt Upper 8497 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 8498 Expr *Comparison 8499 = new (S.Context) BinaryOperator(IterationVarRefRVal, 8500 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 8501 BO_NE, S.Context.BoolTy, 8502 VK_RValue, OK_Ordinary, Loc, false); 8503 8504 // Create the pre-increment of the iteration variable. 8505 Expr *Increment 8506 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 8507 VK_LValue, OK_Ordinary, Loc); 8508 8509 // Construct the loop that copies all elements of this array. 8510 return S.ActOnForStmt(Loc, Loc, InitStmt, 8511 S.MakeFullExpr(Comparison), 8512 0, S.MakeFullDiscardedValueExpr(Increment), 8513 Loc, Copy.take()); 8514} 8515 8516static StmtResult 8517buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 8518 Expr *To, Expr *From, 8519 bool CopyingBaseSubobject, bool Copying) { 8520 // Maybe we should use a memcpy? 8521 if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() && 8522 T.isTriviallyCopyableType(S.Context)) 8523 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 8524 8525 StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From, 8526 CopyingBaseSubobject, 8527 Copying, 0)); 8528 8529 // If we ended up picking a trivial assignment operator for an array of a 8530 // non-trivially-copyable class type, just emit a memcpy. 8531 if (!Result.isInvalid() && !Result.get()) 8532 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 8533 8534 return Result; 8535} 8536 8537Sema::ImplicitExceptionSpecification 8538Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 8539 CXXRecordDecl *ClassDecl = MD->getParent(); 8540 8541 ImplicitExceptionSpecification ExceptSpec(*this); 8542 if (ClassDecl->isInvalidDecl()) 8543 return ExceptSpec; 8544 8545 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 8546 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 8547 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 8548 8549 // C++ [except.spec]p14: 8550 // An implicitly declared special member function (Clause 12) shall have an 8551 // exception-specification. [...] 8552 8553 // It is unspecified whether or not an implicit copy assignment operator 8554 // attempts to deduplicate calls to assignment operators of virtual bases are 8555 // made. As such, this exception specification is effectively unspecified. 8556 // Based on a similar decision made for constness in C++0x, we're erring on 8557 // the side of assuming such calls to be made regardless of whether they 8558 // actually happen. 8559 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8560 BaseEnd = ClassDecl->bases_end(); 8561 Base != BaseEnd; ++Base) { 8562 if (Base->isVirtual()) 8563 continue; 8564 8565 CXXRecordDecl *BaseClassDecl 8566 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8567 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 8568 ArgQuals, false, 0)) 8569 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 8570 } 8571 8572 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8573 BaseEnd = ClassDecl->vbases_end(); 8574 Base != BaseEnd; ++Base) { 8575 CXXRecordDecl *BaseClassDecl 8576 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8577 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 8578 ArgQuals, false, 0)) 8579 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 8580 } 8581 8582 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8583 FieldEnd = ClassDecl->field_end(); 8584 Field != FieldEnd; 8585 ++Field) { 8586 QualType FieldType = Context.getBaseElementType(Field->getType()); 8587 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8588 if (CXXMethodDecl *CopyAssign = 8589 LookupCopyingAssignment(FieldClassDecl, 8590 ArgQuals | FieldType.getCVRQualifiers(), 8591 false, 0)) 8592 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 8593 } 8594 } 8595 8596 return ExceptSpec; 8597} 8598 8599CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 8600 // Note: The following rules are largely analoguous to the copy 8601 // constructor rules. Note that virtual bases are not taken into account 8602 // for determining the argument type of the operator. Note also that 8603 // operators taking an object instead of a reference are allowed. 8604 assert(ClassDecl->needsImplicitCopyAssignment()); 8605 8606 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyAssignment); 8607 if (DSM.isAlreadyBeingDeclared()) 8608 return 0; 8609 8610 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8611 QualType RetType = Context.getLValueReferenceType(ArgType); 8612 if (ClassDecl->implicitCopyAssignmentHasConstParam()) 8613 ArgType = ArgType.withConst(); 8614 ArgType = Context.getLValueReferenceType(ArgType); 8615 8616 // An implicitly-declared copy assignment operator is an inline public 8617 // member of its class. 8618 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8619 SourceLocation ClassLoc = ClassDecl->getLocation(); 8620 DeclarationNameInfo NameInfo(Name, ClassLoc); 8621 CXXMethodDecl *CopyAssignment 8622 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8623 /*TInfo=*/0, 8624 /*StorageClass=*/SC_None, 8625 /*isInline=*/true, /*isConstexpr=*/false, 8626 SourceLocation()); 8627 CopyAssignment->setAccess(AS_public); 8628 CopyAssignment->setDefaulted(); 8629 CopyAssignment->setImplicit(); 8630 8631 // Build an exception specification pointing back at this member. 8632 FunctionProtoType::ExtProtoInfo EPI; 8633 EPI.ExceptionSpecType = EST_Unevaluated; 8634 EPI.ExceptionSpecDecl = CopyAssignment; 8635 CopyAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); 8636 8637 // Add the parameter to the operator. 8638 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 8639 ClassLoc, ClassLoc, /*Id=*/0, 8640 ArgType, /*TInfo=*/0, 8641 SC_None, 0); 8642 CopyAssignment->setParams(FromParam); 8643 8644 AddOverriddenMethods(ClassDecl, CopyAssignment); 8645 8646 CopyAssignment->setTrivial( 8647 ClassDecl->needsOverloadResolutionForCopyAssignment() 8648 ? SpecialMemberIsTrivial(CopyAssignment, CXXCopyAssignment) 8649 : ClassDecl->hasTrivialCopyAssignment()); 8650 8651 // C++0x [class.copy]p19: 8652 // .... If the class definition does not explicitly declare a copy 8653 // assignment operator, there is no user-declared move constructor, and 8654 // there is no user-declared move assignment operator, a copy assignment 8655 // operator is implicitly declared as defaulted. 8656 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 8657 SetDeclDeleted(CopyAssignment, ClassLoc); 8658 8659 // Note that we have added this copy-assignment operator. 8660 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 8661 8662 if (Scope *S = getScopeForContext(ClassDecl)) 8663 PushOnScopeChains(CopyAssignment, S, false); 8664 ClassDecl->addDecl(CopyAssignment); 8665 8666 return CopyAssignment; 8667} 8668 8669void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 8670 CXXMethodDecl *CopyAssignOperator) { 8671 assert((CopyAssignOperator->isDefaulted() && 8672 CopyAssignOperator->isOverloadedOperator() && 8673 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 8674 !CopyAssignOperator->doesThisDeclarationHaveABody() && 8675 !CopyAssignOperator->isDeleted()) && 8676 "DefineImplicitCopyAssignment called for wrong function"); 8677 8678 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 8679 8680 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 8681 CopyAssignOperator->setInvalidDecl(); 8682 return; 8683 } 8684 8685 CopyAssignOperator->setUsed(); 8686 8687 SynthesizedFunctionScope Scope(*this, CopyAssignOperator); 8688 DiagnosticErrorTrap Trap(Diags); 8689 8690 // C++0x [class.copy]p30: 8691 // The implicitly-defined or explicitly-defaulted copy assignment operator 8692 // for a non-union class X performs memberwise copy assignment of its 8693 // subobjects. The direct base classes of X are assigned first, in the 8694 // order of their declaration in the base-specifier-list, and then the 8695 // immediate non-static data members of X are assigned, in the order in 8696 // which they were declared in the class definition. 8697 8698 // The statements that form the synthesized function body. 8699 SmallVector<Stmt*, 8> Statements; 8700 8701 // The parameter for the "other" object, which we are copying from. 8702 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 8703 Qualifiers OtherQuals = Other->getType().getQualifiers(); 8704 QualType OtherRefType = Other->getType(); 8705 if (const LValueReferenceType *OtherRef 8706 = OtherRefType->getAs<LValueReferenceType>()) { 8707 OtherRefType = OtherRef->getPointeeType(); 8708 OtherQuals = OtherRefType.getQualifiers(); 8709 } 8710 8711 // Our location for everything implicitly-generated. 8712 SourceLocation Loc = CopyAssignOperator->getLocation(); 8713 8714 // Construct a reference to the "other" object. We'll be using this 8715 // throughout the generated ASTs. 8716 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8717 assert(OtherRef && "Reference to parameter cannot fail!"); 8718 8719 // Construct the "this" pointer. We'll be using this throughout the generated 8720 // ASTs. 8721 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8722 assert(This && "Reference to this cannot fail!"); 8723 8724 // Assign base classes. 8725 bool Invalid = false; 8726 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8727 E = ClassDecl->bases_end(); Base != E; ++Base) { 8728 // Form the assignment: 8729 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 8730 QualType BaseType = Base->getType().getUnqualifiedType(); 8731 if (!BaseType->isRecordType()) { 8732 Invalid = true; 8733 continue; 8734 } 8735 8736 CXXCastPath BasePath; 8737 BasePath.push_back(Base); 8738 8739 // Construct the "from" expression, which is an implicit cast to the 8740 // appropriately-qualified base type. 8741 Expr *From = OtherRef; 8742 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 8743 CK_UncheckedDerivedToBase, 8744 VK_LValue, &BasePath).take(); 8745 8746 // Dereference "this". 8747 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8748 8749 // Implicitly cast "this" to the appropriately-qualified base type. 8750 To = ImpCastExprToType(To.take(), 8751 Context.getCVRQualifiedType(BaseType, 8752 CopyAssignOperator->getTypeQualifiers()), 8753 CK_UncheckedDerivedToBase, 8754 VK_LValue, &BasePath); 8755 8756 // Build the copy. 8757 StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType, 8758 To.get(), From, 8759 /*CopyingBaseSubobject=*/true, 8760 /*Copying=*/true); 8761 if (Copy.isInvalid()) { 8762 Diag(CurrentLocation, diag::note_member_synthesized_at) 8763 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8764 CopyAssignOperator->setInvalidDecl(); 8765 return; 8766 } 8767 8768 // Success! Record the copy. 8769 Statements.push_back(Copy.takeAs<Expr>()); 8770 } 8771 8772 // Assign non-static members. 8773 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8774 FieldEnd = ClassDecl->field_end(); 8775 Field != FieldEnd; ++Field) { 8776 if (Field->isUnnamedBitfield()) 8777 continue; 8778 8779 // Check for members of reference type; we can't copy those. 8780 if (Field->getType()->isReferenceType()) { 8781 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8782 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8783 Diag(Field->getLocation(), diag::note_declared_at); 8784 Diag(CurrentLocation, diag::note_member_synthesized_at) 8785 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8786 Invalid = true; 8787 continue; 8788 } 8789 8790 // Check for members of const-qualified, non-class type. 8791 QualType BaseType = Context.getBaseElementType(Field->getType()); 8792 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8793 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8794 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8795 Diag(Field->getLocation(), diag::note_declared_at); 8796 Diag(CurrentLocation, diag::note_member_synthesized_at) 8797 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8798 Invalid = true; 8799 continue; 8800 } 8801 8802 // Suppress assigning zero-width bitfields. 8803 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8804 continue; 8805 8806 QualType FieldType = Field->getType().getNonReferenceType(); 8807 if (FieldType->isIncompleteArrayType()) { 8808 assert(ClassDecl->hasFlexibleArrayMember() && 8809 "Incomplete array type is not valid"); 8810 continue; 8811 } 8812 8813 // Build references to the field in the object we're copying from and to. 8814 CXXScopeSpec SS; // Intentionally empty 8815 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8816 LookupMemberName); 8817 MemberLookup.addDecl(*Field); 8818 MemberLookup.resolveKind(); 8819 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8820 Loc, /*IsArrow=*/false, 8821 SS, SourceLocation(), 0, 8822 MemberLookup, 0); 8823 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8824 Loc, /*IsArrow=*/true, 8825 SS, SourceLocation(), 0, 8826 MemberLookup, 0); 8827 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8828 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8829 8830 // Build the copy of this field. 8831 StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType, 8832 To.get(), From.get(), 8833 /*CopyingBaseSubobject=*/false, 8834 /*Copying=*/true); 8835 if (Copy.isInvalid()) { 8836 Diag(CurrentLocation, diag::note_member_synthesized_at) 8837 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8838 CopyAssignOperator->setInvalidDecl(); 8839 return; 8840 } 8841 8842 // Success! Record the copy. 8843 Statements.push_back(Copy.takeAs<Stmt>()); 8844 } 8845 8846 if (!Invalid) { 8847 // Add a "return *this;" 8848 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8849 8850 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8851 if (Return.isInvalid()) 8852 Invalid = true; 8853 else { 8854 Statements.push_back(Return.takeAs<Stmt>()); 8855 8856 if (Trap.hasErrorOccurred()) { 8857 Diag(CurrentLocation, diag::note_member_synthesized_at) 8858 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8859 Invalid = true; 8860 } 8861 } 8862 } 8863 8864 if (Invalid) { 8865 CopyAssignOperator->setInvalidDecl(); 8866 return; 8867 } 8868 8869 StmtResult Body; 8870 { 8871 CompoundScopeRAII CompoundScope(*this); 8872 Body = ActOnCompoundStmt(Loc, Loc, Statements, 8873 /*isStmtExpr=*/false); 8874 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8875 } 8876 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 8877 8878 if (ASTMutationListener *L = getASTMutationListener()) { 8879 L->CompletedImplicitDefinition(CopyAssignOperator); 8880 } 8881} 8882 8883Sema::ImplicitExceptionSpecification 8884Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 8885 CXXRecordDecl *ClassDecl = MD->getParent(); 8886 8887 ImplicitExceptionSpecification ExceptSpec(*this); 8888 if (ClassDecl->isInvalidDecl()) 8889 return ExceptSpec; 8890 8891 // C++0x [except.spec]p14: 8892 // An implicitly declared special member function (Clause 12) shall have an 8893 // exception-specification. [...] 8894 8895 // It is unspecified whether or not an implicit move assignment operator 8896 // attempts to deduplicate calls to assignment operators of virtual bases are 8897 // made. As such, this exception specification is effectively unspecified. 8898 // Based on a similar decision made for constness in C++0x, we're erring on 8899 // the side of assuming such calls to be made regardless of whether they 8900 // actually happen. 8901 // Note that a move constructor is not implicitly declared when there are 8902 // virtual bases, but it can still be user-declared and explicitly defaulted. 8903 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8904 BaseEnd = ClassDecl->bases_end(); 8905 Base != BaseEnd; ++Base) { 8906 if (Base->isVirtual()) 8907 continue; 8908 8909 CXXRecordDecl *BaseClassDecl 8910 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8911 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8912 0, false, 0)) 8913 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8914 } 8915 8916 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8917 BaseEnd = ClassDecl->vbases_end(); 8918 Base != BaseEnd; ++Base) { 8919 CXXRecordDecl *BaseClassDecl 8920 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8921 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8922 0, false, 0)) 8923 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8924 } 8925 8926 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8927 FieldEnd = ClassDecl->field_end(); 8928 Field != FieldEnd; 8929 ++Field) { 8930 QualType FieldType = Context.getBaseElementType(Field->getType()); 8931 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8932 if (CXXMethodDecl *MoveAssign = 8933 LookupMovingAssignment(FieldClassDecl, 8934 FieldType.getCVRQualifiers(), 8935 false, 0)) 8936 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 8937 } 8938 } 8939 8940 return ExceptSpec; 8941} 8942 8943/// Determine whether the class type has any direct or indirect virtual base 8944/// classes which have a non-trivial move assignment operator. 8945static bool 8946hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 8947 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8948 BaseEnd = ClassDecl->vbases_end(); 8949 Base != BaseEnd; ++Base) { 8950 CXXRecordDecl *BaseClass = 8951 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8952 8953 // Try to declare the move assignment. If it would be deleted, then the 8954 // class does not have a non-trivial move assignment. 8955 if (BaseClass->needsImplicitMoveAssignment()) 8956 S.DeclareImplicitMoveAssignment(BaseClass); 8957 8958 if (BaseClass->hasNonTrivialMoveAssignment()) 8959 return true; 8960 } 8961 8962 return false; 8963} 8964 8965/// Determine whether the given type either has a move constructor or is 8966/// trivially copyable. 8967static bool 8968hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8969 Type = S.Context.getBaseElementType(Type); 8970 8971 // FIXME: Technically, non-trivially-copyable non-class types, such as 8972 // reference types, are supposed to return false here, but that appears 8973 // to be a standard defect. 8974 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8975 if (!ClassDecl || !ClassDecl->getDefinition() || ClassDecl->isInvalidDecl()) 8976 return true; 8977 8978 if (Type.isTriviallyCopyableType(S.Context)) 8979 return true; 8980 8981 if (IsConstructor) { 8982 // FIXME: Need this because otherwise hasMoveConstructor isn't guaranteed to 8983 // give the right answer. 8984 if (ClassDecl->needsImplicitMoveConstructor()) 8985 S.DeclareImplicitMoveConstructor(ClassDecl); 8986 return ClassDecl->hasMoveConstructor(); 8987 } 8988 8989 // FIXME: Need this because otherwise hasMoveAssignment isn't guaranteed to 8990 // give the right answer. 8991 if (ClassDecl->needsImplicitMoveAssignment()) 8992 S.DeclareImplicitMoveAssignment(ClassDecl); 8993 return ClassDecl->hasMoveAssignment(); 8994} 8995 8996/// Determine whether all non-static data members and direct or virtual bases 8997/// of class \p ClassDecl have either a move operation, or are trivially 8998/// copyable. 8999static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 9000 bool IsConstructor) { 9001 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9002 BaseEnd = ClassDecl->bases_end(); 9003 Base != BaseEnd; ++Base) { 9004 if (Base->isVirtual()) 9005 continue; 9006 9007 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 9008 return false; 9009 } 9010 9011 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9012 BaseEnd = ClassDecl->vbases_end(); 9013 Base != BaseEnd; ++Base) { 9014 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 9015 return false; 9016 } 9017 9018 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9019 FieldEnd = ClassDecl->field_end(); 9020 Field != FieldEnd; ++Field) { 9021 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 9022 return false; 9023 } 9024 9025 return true; 9026} 9027 9028CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 9029 // C++11 [class.copy]p20: 9030 // If the definition of a class X does not explicitly declare a move 9031 // assignment operator, one will be implicitly declared as defaulted 9032 // if and only if: 9033 // 9034 // - [first 4 bullets] 9035 assert(ClassDecl->needsImplicitMoveAssignment()); 9036 9037 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveAssignment); 9038 if (DSM.isAlreadyBeingDeclared()) 9039 return 0; 9040 9041 // [Checked after we build the declaration] 9042 // - the move assignment operator would not be implicitly defined as 9043 // deleted, 9044 9045 // [DR1402]: 9046 // - X has no direct or indirect virtual base class with a non-trivial 9047 // move assignment operator, and 9048 // - each of X's non-static data members and direct or virtual base classes 9049 // has a type that either has a move assignment operator or is trivially 9050 // copyable. 9051 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 9052 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 9053 ClassDecl->setFailedImplicitMoveAssignment(); 9054 return 0; 9055 } 9056 9057 // Note: The following rules are largely analoguous to the move 9058 // constructor rules. 9059 9060 QualType ArgType = Context.getTypeDeclType(ClassDecl); 9061 QualType RetType = Context.getLValueReferenceType(ArgType); 9062 ArgType = Context.getRValueReferenceType(ArgType); 9063 9064 // An implicitly-declared move assignment operator is an inline public 9065 // member of its class. 9066 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 9067 SourceLocation ClassLoc = ClassDecl->getLocation(); 9068 DeclarationNameInfo NameInfo(Name, ClassLoc); 9069 CXXMethodDecl *MoveAssignment 9070 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 9071 /*TInfo=*/0, 9072 /*StorageClass=*/SC_None, 9073 /*isInline=*/true, 9074 /*isConstexpr=*/false, 9075 SourceLocation()); 9076 MoveAssignment->setAccess(AS_public); 9077 MoveAssignment->setDefaulted(); 9078 MoveAssignment->setImplicit(); 9079 9080 // Build an exception specification pointing back at this member. 9081 FunctionProtoType::ExtProtoInfo EPI; 9082 EPI.ExceptionSpecType = EST_Unevaluated; 9083 EPI.ExceptionSpecDecl = MoveAssignment; 9084 MoveAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); 9085 9086 // Add the parameter to the operator. 9087 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 9088 ClassLoc, ClassLoc, /*Id=*/0, 9089 ArgType, /*TInfo=*/0, 9090 SC_None, 0); 9091 MoveAssignment->setParams(FromParam); 9092 9093 AddOverriddenMethods(ClassDecl, MoveAssignment); 9094 9095 MoveAssignment->setTrivial( 9096 ClassDecl->needsOverloadResolutionForMoveAssignment() 9097 ? SpecialMemberIsTrivial(MoveAssignment, CXXMoveAssignment) 9098 : ClassDecl->hasTrivialMoveAssignment()); 9099 9100 // C++0x [class.copy]p9: 9101 // If the definition of a class X does not explicitly declare a move 9102 // assignment operator, one will be implicitly declared as defaulted if and 9103 // only if: 9104 // [...] 9105 // - the move assignment operator would not be implicitly defined as 9106 // deleted. 9107 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 9108 // Cache this result so that we don't try to generate this over and over 9109 // on every lookup, leaking memory and wasting time. 9110 ClassDecl->setFailedImplicitMoveAssignment(); 9111 return 0; 9112 } 9113 9114 // Note that we have added this copy-assignment operator. 9115 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 9116 9117 if (Scope *S = getScopeForContext(ClassDecl)) 9118 PushOnScopeChains(MoveAssignment, S, false); 9119 ClassDecl->addDecl(MoveAssignment); 9120 9121 return MoveAssignment; 9122} 9123 9124void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 9125 CXXMethodDecl *MoveAssignOperator) { 9126 assert((MoveAssignOperator->isDefaulted() && 9127 MoveAssignOperator->isOverloadedOperator() && 9128 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 9129 !MoveAssignOperator->doesThisDeclarationHaveABody() && 9130 !MoveAssignOperator->isDeleted()) && 9131 "DefineImplicitMoveAssignment called for wrong function"); 9132 9133 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 9134 9135 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 9136 MoveAssignOperator->setInvalidDecl(); 9137 return; 9138 } 9139 9140 MoveAssignOperator->setUsed(); 9141 9142 SynthesizedFunctionScope Scope(*this, MoveAssignOperator); 9143 DiagnosticErrorTrap Trap(Diags); 9144 9145 // C++0x [class.copy]p28: 9146 // The implicitly-defined or move assignment operator for a non-union class 9147 // X performs memberwise move assignment of its subobjects. The direct base 9148 // classes of X are assigned first, in the order of their declaration in the 9149 // base-specifier-list, and then the immediate non-static data members of X 9150 // are assigned, in the order in which they were declared in the class 9151 // definition. 9152 9153 // The statements that form the synthesized function body. 9154 SmallVector<Stmt*, 8> Statements; 9155 9156 // The parameter for the "other" object, which we are move from. 9157 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 9158 QualType OtherRefType = Other->getType()-> 9159 getAs<RValueReferenceType>()->getPointeeType(); 9160 assert(OtherRefType.getQualifiers() == 0 && 9161 "Bad argument type of defaulted move assignment"); 9162 9163 // Our location for everything implicitly-generated. 9164 SourceLocation Loc = MoveAssignOperator->getLocation(); 9165 9166 // Construct a reference to the "other" object. We'll be using this 9167 // throughout the generated ASTs. 9168 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 9169 assert(OtherRef && "Reference to parameter cannot fail!"); 9170 // Cast to rvalue. 9171 OtherRef = CastForMoving(*this, OtherRef); 9172 9173 // Construct the "this" pointer. We'll be using this throughout the generated 9174 // ASTs. 9175 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 9176 assert(This && "Reference to this cannot fail!"); 9177 9178 // Assign base classes. 9179 bool Invalid = false; 9180 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9181 E = ClassDecl->bases_end(); Base != E; ++Base) { 9182 // Form the assignment: 9183 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 9184 QualType BaseType = Base->getType().getUnqualifiedType(); 9185 if (!BaseType->isRecordType()) { 9186 Invalid = true; 9187 continue; 9188 } 9189 9190 CXXCastPath BasePath; 9191 BasePath.push_back(Base); 9192 9193 // Construct the "from" expression, which is an implicit cast to the 9194 // appropriately-qualified base type. 9195 Expr *From = OtherRef; 9196 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 9197 VK_XValue, &BasePath).take(); 9198 9199 // Dereference "this". 9200 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 9201 9202 // Implicitly cast "this" to the appropriately-qualified base type. 9203 To = ImpCastExprToType(To.take(), 9204 Context.getCVRQualifiedType(BaseType, 9205 MoveAssignOperator->getTypeQualifiers()), 9206 CK_UncheckedDerivedToBase, 9207 VK_LValue, &BasePath); 9208 9209 // Build the move. 9210 StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType, 9211 To.get(), From, 9212 /*CopyingBaseSubobject=*/true, 9213 /*Copying=*/false); 9214 if (Move.isInvalid()) { 9215 Diag(CurrentLocation, diag::note_member_synthesized_at) 9216 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9217 MoveAssignOperator->setInvalidDecl(); 9218 return; 9219 } 9220 9221 // Success! Record the move. 9222 Statements.push_back(Move.takeAs<Expr>()); 9223 } 9224 9225 // Assign non-static members. 9226 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9227 FieldEnd = ClassDecl->field_end(); 9228 Field != FieldEnd; ++Field) { 9229 if (Field->isUnnamedBitfield()) 9230 continue; 9231 9232 // Check for members of reference type; we can't move those. 9233 if (Field->getType()->isReferenceType()) { 9234 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9235 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 9236 Diag(Field->getLocation(), diag::note_declared_at); 9237 Diag(CurrentLocation, diag::note_member_synthesized_at) 9238 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9239 Invalid = true; 9240 continue; 9241 } 9242 9243 // Check for members of const-qualified, non-class type. 9244 QualType BaseType = Context.getBaseElementType(Field->getType()); 9245 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 9246 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9247 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 9248 Diag(Field->getLocation(), diag::note_declared_at); 9249 Diag(CurrentLocation, diag::note_member_synthesized_at) 9250 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9251 Invalid = true; 9252 continue; 9253 } 9254 9255 // Suppress assigning zero-width bitfields. 9256 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 9257 continue; 9258 9259 QualType FieldType = Field->getType().getNonReferenceType(); 9260 if (FieldType->isIncompleteArrayType()) { 9261 assert(ClassDecl->hasFlexibleArrayMember() && 9262 "Incomplete array type is not valid"); 9263 continue; 9264 } 9265 9266 // Build references to the field in the object we're copying from and to. 9267 CXXScopeSpec SS; // Intentionally empty 9268 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 9269 LookupMemberName); 9270 MemberLookup.addDecl(*Field); 9271 MemberLookup.resolveKind(); 9272 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 9273 Loc, /*IsArrow=*/false, 9274 SS, SourceLocation(), 0, 9275 MemberLookup, 0); 9276 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 9277 Loc, /*IsArrow=*/true, 9278 SS, SourceLocation(), 0, 9279 MemberLookup, 0); 9280 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 9281 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 9282 9283 assert(!From.get()->isLValue() && // could be xvalue or prvalue 9284 "Member reference with rvalue base must be rvalue except for reference " 9285 "members, which aren't allowed for move assignment."); 9286 9287 // Build the move of this field. 9288 StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType, 9289 To.get(), From.get(), 9290 /*CopyingBaseSubobject=*/false, 9291 /*Copying=*/false); 9292 if (Move.isInvalid()) { 9293 Diag(CurrentLocation, diag::note_member_synthesized_at) 9294 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9295 MoveAssignOperator->setInvalidDecl(); 9296 return; 9297 } 9298 9299 // Success! Record the copy. 9300 Statements.push_back(Move.takeAs<Stmt>()); 9301 } 9302 9303 if (!Invalid) { 9304 // Add a "return *this;" 9305 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 9306 9307 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 9308 if (Return.isInvalid()) 9309 Invalid = true; 9310 else { 9311 Statements.push_back(Return.takeAs<Stmt>()); 9312 9313 if (Trap.hasErrorOccurred()) { 9314 Diag(CurrentLocation, diag::note_member_synthesized_at) 9315 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9316 Invalid = true; 9317 } 9318 } 9319 } 9320 9321 if (Invalid) { 9322 MoveAssignOperator->setInvalidDecl(); 9323 return; 9324 } 9325 9326 StmtResult Body; 9327 { 9328 CompoundScopeRAII CompoundScope(*this); 9329 Body = ActOnCompoundStmt(Loc, Loc, Statements, 9330 /*isStmtExpr=*/false); 9331 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 9332 } 9333 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 9334 9335 if (ASTMutationListener *L = getASTMutationListener()) { 9336 L->CompletedImplicitDefinition(MoveAssignOperator); 9337 } 9338} 9339 9340Sema::ImplicitExceptionSpecification 9341Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 9342 CXXRecordDecl *ClassDecl = MD->getParent(); 9343 9344 ImplicitExceptionSpecification ExceptSpec(*this); 9345 if (ClassDecl->isInvalidDecl()) 9346 return ExceptSpec; 9347 9348 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 9349 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 9350 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 9351 9352 // C++ [except.spec]p14: 9353 // An implicitly declared special member function (Clause 12) shall have an 9354 // exception-specification. [...] 9355 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9356 BaseEnd = ClassDecl->bases_end(); 9357 Base != BaseEnd; 9358 ++Base) { 9359 // Virtual bases are handled below. 9360 if (Base->isVirtual()) 9361 continue; 9362 9363 CXXRecordDecl *BaseClassDecl 9364 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9365 if (CXXConstructorDecl *CopyConstructor = 9366 LookupCopyingConstructor(BaseClassDecl, Quals)) 9367 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 9368 } 9369 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9370 BaseEnd = ClassDecl->vbases_end(); 9371 Base != BaseEnd; 9372 ++Base) { 9373 CXXRecordDecl *BaseClassDecl 9374 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9375 if (CXXConstructorDecl *CopyConstructor = 9376 LookupCopyingConstructor(BaseClassDecl, Quals)) 9377 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 9378 } 9379 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9380 FieldEnd = ClassDecl->field_end(); 9381 Field != FieldEnd; 9382 ++Field) { 9383 QualType FieldType = Context.getBaseElementType(Field->getType()); 9384 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 9385 if (CXXConstructorDecl *CopyConstructor = 9386 LookupCopyingConstructor(FieldClassDecl, 9387 Quals | FieldType.getCVRQualifiers())) 9388 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 9389 } 9390 } 9391 9392 return ExceptSpec; 9393} 9394 9395CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 9396 CXXRecordDecl *ClassDecl) { 9397 // C++ [class.copy]p4: 9398 // If the class definition does not explicitly declare a copy 9399 // constructor, one is declared implicitly. 9400 assert(ClassDecl->needsImplicitCopyConstructor()); 9401 9402 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyConstructor); 9403 if (DSM.isAlreadyBeingDeclared()) 9404 return 0; 9405 9406 QualType ClassType = Context.getTypeDeclType(ClassDecl); 9407 QualType ArgType = ClassType; 9408 bool Const = ClassDecl->implicitCopyConstructorHasConstParam(); 9409 if (Const) 9410 ArgType = ArgType.withConst(); 9411 ArgType = Context.getLValueReferenceType(ArgType); 9412 9413 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9414 CXXCopyConstructor, 9415 Const); 9416 9417 DeclarationName Name 9418 = Context.DeclarationNames.getCXXConstructorName( 9419 Context.getCanonicalType(ClassType)); 9420 SourceLocation ClassLoc = ClassDecl->getLocation(); 9421 DeclarationNameInfo NameInfo(Name, ClassLoc); 9422 9423 // An implicitly-declared copy constructor is an inline public 9424 // member of its class. 9425 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 9426 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 9427 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 9428 Constexpr); 9429 CopyConstructor->setAccess(AS_public); 9430 CopyConstructor->setDefaulted(); 9431 9432 // Build an exception specification pointing back at this member. 9433 FunctionProtoType::ExtProtoInfo EPI; 9434 EPI.ExceptionSpecType = EST_Unevaluated; 9435 EPI.ExceptionSpecDecl = CopyConstructor; 9436 CopyConstructor->setType( 9437 Context.getFunctionType(Context.VoidTy, ArgType, EPI)); 9438 9439 // Add the parameter to the constructor. 9440 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 9441 ClassLoc, ClassLoc, 9442 /*IdentifierInfo=*/0, 9443 ArgType, /*TInfo=*/0, 9444 SC_None, 0); 9445 CopyConstructor->setParams(FromParam); 9446 9447 CopyConstructor->setTrivial( 9448 ClassDecl->needsOverloadResolutionForCopyConstructor() 9449 ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor) 9450 : ClassDecl->hasTrivialCopyConstructor()); 9451 9452 // C++11 [class.copy]p8: 9453 // ... If the class definition does not explicitly declare a copy 9454 // constructor, there is no user-declared move constructor, and there is no 9455 // user-declared move assignment operator, a copy constructor is implicitly 9456 // declared as defaulted. 9457 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 9458 SetDeclDeleted(CopyConstructor, ClassLoc); 9459 9460 // Note that we have declared this constructor. 9461 ++ASTContext::NumImplicitCopyConstructorsDeclared; 9462 9463 if (Scope *S = getScopeForContext(ClassDecl)) 9464 PushOnScopeChains(CopyConstructor, S, false); 9465 ClassDecl->addDecl(CopyConstructor); 9466 9467 return CopyConstructor; 9468} 9469 9470void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 9471 CXXConstructorDecl *CopyConstructor) { 9472 assert((CopyConstructor->isDefaulted() && 9473 CopyConstructor->isCopyConstructor() && 9474 !CopyConstructor->doesThisDeclarationHaveABody() && 9475 !CopyConstructor->isDeleted()) && 9476 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 9477 9478 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 9479 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 9480 9481 SynthesizedFunctionScope Scope(*this, CopyConstructor); 9482 DiagnosticErrorTrap Trap(Diags); 9483 9484 if (SetCtorInitializers(CopyConstructor, /*AnyErrors=*/false) || 9485 Trap.hasErrorOccurred()) { 9486 Diag(CurrentLocation, diag::note_member_synthesized_at) 9487 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 9488 CopyConstructor->setInvalidDecl(); 9489 } else { 9490 Sema::CompoundScopeRAII CompoundScope(*this); 9491 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 9492 CopyConstructor->getLocation(), 9493 MultiStmtArg(), 9494 /*isStmtExpr=*/false) 9495 .takeAs<Stmt>()); 9496 CopyConstructor->setImplicitlyDefined(true); 9497 } 9498 9499 CopyConstructor->setUsed(); 9500 if (ASTMutationListener *L = getASTMutationListener()) { 9501 L->CompletedImplicitDefinition(CopyConstructor); 9502 } 9503} 9504 9505Sema::ImplicitExceptionSpecification 9506Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 9507 CXXRecordDecl *ClassDecl = MD->getParent(); 9508 9509 // C++ [except.spec]p14: 9510 // An implicitly declared special member function (Clause 12) shall have an 9511 // exception-specification. [...] 9512 ImplicitExceptionSpecification ExceptSpec(*this); 9513 if (ClassDecl->isInvalidDecl()) 9514 return ExceptSpec; 9515 9516 // Direct base-class constructors. 9517 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 9518 BEnd = ClassDecl->bases_end(); 9519 B != BEnd; ++B) { 9520 if (B->isVirtual()) // Handled below. 9521 continue; 9522 9523 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 9524 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 9525 CXXConstructorDecl *Constructor = 9526 LookupMovingConstructor(BaseClassDecl, 0); 9527 // If this is a deleted function, add it anyway. This might be conformant 9528 // with the standard. This might not. I'm not sure. It might not matter. 9529 if (Constructor) 9530 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 9531 } 9532 } 9533 9534 // Virtual base-class constructors. 9535 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 9536 BEnd = ClassDecl->vbases_end(); 9537 B != BEnd; ++B) { 9538 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 9539 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 9540 CXXConstructorDecl *Constructor = 9541 LookupMovingConstructor(BaseClassDecl, 0); 9542 // If this is a deleted function, add it anyway. This might be conformant 9543 // with the standard. This might not. I'm not sure. It might not matter. 9544 if (Constructor) 9545 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 9546 } 9547 } 9548 9549 // Field constructors. 9550 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 9551 FEnd = ClassDecl->field_end(); 9552 F != FEnd; ++F) { 9553 QualType FieldType = Context.getBaseElementType(F->getType()); 9554 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 9555 CXXConstructorDecl *Constructor = 9556 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 9557 // If this is a deleted function, add it anyway. This might be conformant 9558 // with the standard. This might not. I'm not sure. It might not matter. 9559 // In particular, the problem is that this function never gets called. It 9560 // might just be ill-formed because this function attempts to refer to 9561 // a deleted function here. 9562 if (Constructor) 9563 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 9564 } 9565 } 9566 9567 return ExceptSpec; 9568} 9569 9570CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 9571 CXXRecordDecl *ClassDecl) { 9572 // C++11 [class.copy]p9: 9573 // If the definition of a class X does not explicitly declare a move 9574 // constructor, one will be implicitly declared as defaulted if and only if: 9575 // 9576 // - [first 4 bullets] 9577 assert(ClassDecl->needsImplicitMoveConstructor()); 9578 9579 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveConstructor); 9580 if (DSM.isAlreadyBeingDeclared()) 9581 return 0; 9582 9583 // [Checked after we build the declaration] 9584 // - the move assignment operator would not be implicitly defined as 9585 // deleted, 9586 9587 // [DR1402]: 9588 // - each of X's non-static data members and direct or virtual base classes 9589 // has a type that either has a move constructor or is trivially copyable. 9590 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 9591 ClassDecl->setFailedImplicitMoveConstructor(); 9592 return 0; 9593 } 9594 9595 QualType ClassType = Context.getTypeDeclType(ClassDecl); 9596 QualType ArgType = Context.getRValueReferenceType(ClassType); 9597 9598 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9599 CXXMoveConstructor, 9600 false); 9601 9602 DeclarationName Name 9603 = Context.DeclarationNames.getCXXConstructorName( 9604 Context.getCanonicalType(ClassType)); 9605 SourceLocation ClassLoc = ClassDecl->getLocation(); 9606 DeclarationNameInfo NameInfo(Name, ClassLoc); 9607 9608 // C++0x [class.copy]p11: 9609 // An implicitly-declared copy/move constructor is an inline public 9610 // member of its class. 9611 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 9612 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 9613 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 9614 Constexpr); 9615 MoveConstructor->setAccess(AS_public); 9616 MoveConstructor->setDefaulted(); 9617 9618 // Build an exception specification pointing back at this member. 9619 FunctionProtoType::ExtProtoInfo EPI; 9620 EPI.ExceptionSpecType = EST_Unevaluated; 9621 EPI.ExceptionSpecDecl = MoveConstructor; 9622 MoveConstructor->setType( 9623 Context.getFunctionType(Context.VoidTy, ArgType, EPI)); 9624 9625 // Add the parameter to the constructor. 9626 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 9627 ClassLoc, ClassLoc, 9628 /*IdentifierInfo=*/0, 9629 ArgType, /*TInfo=*/0, 9630 SC_None, 0); 9631 MoveConstructor->setParams(FromParam); 9632 9633 MoveConstructor->setTrivial( 9634 ClassDecl->needsOverloadResolutionForMoveConstructor() 9635 ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor) 9636 : ClassDecl->hasTrivialMoveConstructor()); 9637 9638 // C++0x [class.copy]p9: 9639 // If the definition of a class X does not explicitly declare a move 9640 // constructor, one will be implicitly declared as defaulted if and only if: 9641 // [...] 9642 // - the move constructor would not be implicitly defined as deleted. 9643 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 9644 // Cache this result so that we don't try to generate this over and over 9645 // on every lookup, leaking memory and wasting time. 9646 ClassDecl->setFailedImplicitMoveConstructor(); 9647 return 0; 9648 } 9649 9650 // Note that we have declared this constructor. 9651 ++ASTContext::NumImplicitMoveConstructorsDeclared; 9652 9653 if (Scope *S = getScopeForContext(ClassDecl)) 9654 PushOnScopeChains(MoveConstructor, S, false); 9655 ClassDecl->addDecl(MoveConstructor); 9656 9657 return MoveConstructor; 9658} 9659 9660void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 9661 CXXConstructorDecl *MoveConstructor) { 9662 assert((MoveConstructor->isDefaulted() && 9663 MoveConstructor->isMoveConstructor() && 9664 !MoveConstructor->doesThisDeclarationHaveABody() && 9665 !MoveConstructor->isDeleted()) && 9666 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 9667 9668 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 9669 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 9670 9671 SynthesizedFunctionScope Scope(*this, MoveConstructor); 9672 DiagnosticErrorTrap Trap(Diags); 9673 9674 if (SetCtorInitializers(MoveConstructor, /*AnyErrors=*/false) || 9675 Trap.hasErrorOccurred()) { 9676 Diag(CurrentLocation, diag::note_member_synthesized_at) 9677 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 9678 MoveConstructor->setInvalidDecl(); 9679 } else { 9680 Sema::CompoundScopeRAII CompoundScope(*this); 9681 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 9682 MoveConstructor->getLocation(), 9683 MultiStmtArg(), 9684 /*isStmtExpr=*/false) 9685 .takeAs<Stmt>()); 9686 MoveConstructor->setImplicitlyDefined(true); 9687 } 9688 9689 MoveConstructor->setUsed(); 9690 9691 if (ASTMutationListener *L = getASTMutationListener()) { 9692 L->CompletedImplicitDefinition(MoveConstructor); 9693 } 9694} 9695 9696bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 9697 return FD->isDeleted() && 9698 (FD->isDefaulted() || FD->isImplicit()) && 9699 isa<CXXMethodDecl>(FD); 9700} 9701 9702/// \brief Mark the call operator of the given lambda closure type as "used". 9703static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 9704 CXXMethodDecl *CallOperator 9705 = cast<CXXMethodDecl>( 9706 Lambda->lookup( 9707 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).front()); 9708 CallOperator->setReferenced(); 9709 CallOperator->setUsed(); 9710} 9711 9712void Sema::DefineImplicitLambdaToFunctionPointerConversion( 9713 SourceLocation CurrentLocation, 9714 CXXConversionDecl *Conv) 9715{ 9716 CXXRecordDecl *Lambda = Conv->getParent(); 9717 9718 // Make sure that the lambda call operator is marked used. 9719 markLambdaCallOperatorUsed(*this, Lambda); 9720 9721 Conv->setUsed(); 9722 9723 SynthesizedFunctionScope Scope(*this, Conv); 9724 DiagnosticErrorTrap Trap(Diags); 9725 9726 // Return the address of the __invoke function. 9727 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 9728 CXXMethodDecl *Invoke 9729 = cast<CXXMethodDecl>(Lambda->lookup(InvokeName).front()); 9730 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 9731 VK_LValue, Conv->getLocation()).take(); 9732 assert(FunctionRef && "Can't refer to __invoke function?"); 9733 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 9734 Conv->setBody(new (Context) CompoundStmt(Context, Return, 9735 Conv->getLocation(), 9736 Conv->getLocation())); 9737 9738 // Fill in the __invoke function with a dummy implementation. IR generation 9739 // will fill in the actual details. 9740 Invoke->setUsed(); 9741 Invoke->setReferenced(); 9742 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation())); 9743 9744 if (ASTMutationListener *L = getASTMutationListener()) { 9745 L->CompletedImplicitDefinition(Conv); 9746 L->CompletedImplicitDefinition(Invoke); 9747 } 9748} 9749 9750void Sema::DefineImplicitLambdaToBlockPointerConversion( 9751 SourceLocation CurrentLocation, 9752 CXXConversionDecl *Conv) 9753{ 9754 Conv->setUsed(); 9755 9756 SynthesizedFunctionScope Scope(*this, Conv); 9757 DiagnosticErrorTrap Trap(Diags); 9758 9759 // Copy-initialize the lambda object as needed to capture it. 9760 Expr *This = ActOnCXXThis(CurrentLocation).take(); 9761 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 9762 9763 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 9764 Conv->getLocation(), 9765 Conv, DerefThis); 9766 9767 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 9768 // behavior. Note that only the general conversion function does this 9769 // (since it's unusable otherwise); in the case where we inline the 9770 // block literal, it has block literal lifetime semantics. 9771 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 9772 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 9773 CK_CopyAndAutoreleaseBlockObject, 9774 BuildBlock.get(), 0, VK_RValue); 9775 9776 if (BuildBlock.isInvalid()) { 9777 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9778 Conv->setInvalidDecl(); 9779 return; 9780 } 9781 9782 // Create the return statement that returns the block from the conversion 9783 // function. 9784 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 9785 if (Return.isInvalid()) { 9786 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9787 Conv->setInvalidDecl(); 9788 return; 9789 } 9790 9791 // Set the body of the conversion function. 9792 Stmt *ReturnS = Return.take(); 9793 Conv->setBody(new (Context) CompoundStmt(Context, ReturnS, 9794 Conv->getLocation(), 9795 Conv->getLocation())); 9796 9797 // We're done; notify the mutation listener, if any. 9798 if (ASTMutationListener *L = getASTMutationListener()) { 9799 L->CompletedImplicitDefinition(Conv); 9800 } 9801} 9802 9803/// \brief Determine whether the given list arguments contains exactly one 9804/// "real" (non-default) argument. 9805static bool hasOneRealArgument(MultiExprArg Args) { 9806 switch (Args.size()) { 9807 case 0: 9808 return false; 9809 9810 default: 9811 if (!Args[1]->isDefaultArgument()) 9812 return false; 9813 9814 // fall through 9815 case 1: 9816 return !Args[0]->isDefaultArgument(); 9817 } 9818 9819 return false; 9820} 9821 9822ExprResult 9823Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9824 CXXConstructorDecl *Constructor, 9825 MultiExprArg ExprArgs, 9826 bool HadMultipleCandidates, 9827 bool IsListInitialization, 9828 bool RequiresZeroInit, 9829 unsigned ConstructKind, 9830 SourceRange ParenRange) { 9831 bool Elidable = false; 9832 9833 // C++0x [class.copy]p34: 9834 // When certain criteria are met, an implementation is allowed to 9835 // omit the copy/move construction of a class object, even if the 9836 // copy/move constructor and/or destructor for the object have 9837 // side effects. [...] 9838 // - when a temporary class object that has not been bound to a 9839 // reference (12.2) would be copied/moved to a class object 9840 // with the same cv-unqualified type, the copy/move operation 9841 // can be omitted by constructing the temporary object 9842 // directly into the target of the omitted copy/move 9843 if (ConstructKind == CXXConstructExpr::CK_Complete && 9844 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9845 Expr *SubExpr = ExprArgs[0]; 9846 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9847 } 9848 9849 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9850 Elidable, ExprArgs, HadMultipleCandidates, 9851 IsListInitialization, RequiresZeroInit, 9852 ConstructKind, ParenRange); 9853} 9854 9855/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9856/// including handling of its default argument expressions. 9857ExprResult 9858Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9859 CXXConstructorDecl *Constructor, bool Elidable, 9860 MultiExprArg ExprArgs, 9861 bool HadMultipleCandidates, 9862 bool IsListInitialization, 9863 bool RequiresZeroInit, 9864 unsigned ConstructKind, 9865 SourceRange ParenRange) { 9866 MarkFunctionReferenced(ConstructLoc, Constructor); 9867 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9868 Constructor, Elidable, ExprArgs, 9869 HadMultipleCandidates, 9870 IsListInitialization, RequiresZeroInit, 9871 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9872 ParenRange)); 9873} 9874 9875void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9876 if (VD->isInvalidDecl()) return; 9877 9878 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9879 if (ClassDecl->isInvalidDecl()) return; 9880 if (ClassDecl->hasIrrelevantDestructor()) return; 9881 if (ClassDecl->isDependentContext()) return; 9882 9883 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9884 MarkFunctionReferenced(VD->getLocation(), Destructor); 9885 CheckDestructorAccess(VD->getLocation(), Destructor, 9886 PDiag(diag::err_access_dtor_var) 9887 << VD->getDeclName() 9888 << VD->getType()); 9889 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9890 9891 if (!VD->hasGlobalStorage()) return; 9892 9893 // Emit warning for non-trivial dtor in global scope (a real global, 9894 // class-static, function-static). 9895 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9896 9897 // TODO: this should be re-enabled for static locals by !CXAAtExit 9898 if (!VD->isStaticLocal()) 9899 Diag(VD->getLocation(), diag::warn_global_destructor); 9900} 9901 9902/// \brief Given a constructor and the set of arguments provided for the 9903/// constructor, convert the arguments and add any required default arguments 9904/// to form a proper call to this constructor. 9905/// 9906/// \returns true if an error occurred, false otherwise. 9907bool 9908Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9909 MultiExprArg ArgsPtr, 9910 SourceLocation Loc, 9911 SmallVectorImpl<Expr*> &ConvertedArgs, 9912 bool AllowExplicit, 9913 bool IsListInitialization) { 9914 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9915 unsigned NumArgs = ArgsPtr.size(); 9916 Expr **Args = ArgsPtr.data(); 9917 9918 const FunctionProtoType *Proto 9919 = Constructor->getType()->getAs<FunctionProtoType>(); 9920 assert(Proto && "Constructor without a prototype?"); 9921 unsigned NumArgsInProto = Proto->getNumArgs(); 9922 9923 // If too few arguments are available, we'll fill in the rest with defaults. 9924 if (NumArgs < NumArgsInProto) 9925 ConvertedArgs.reserve(NumArgsInProto); 9926 else 9927 ConvertedArgs.reserve(NumArgs); 9928 9929 VariadicCallType CallType = 9930 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9931 SmallVector<Expr *, 8> AllArgs; 9932 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9933 Proto, 0, Args, NumArgs, AllArgs, 9934 CallType, AllowExplicit, 9935 IsListInitialization); 9936 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9937 9938 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9939 9940 CheckConstructorCall(Constructor, 9941 llvm::makeArrayRef<const Expr *>(AllArgs.data(), 9942 AllArgs.size()), 9943 Proto, Loc); 9944 9945 return Invalid; 9946} 9947 9948static inline bool 9949CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9950 const FunctionDecl *FnDecl) { 9951 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9952 if (isa<NamespaceDecl>(DC)) { 9953 return SemaRef.Diag(FnDecl->getLocation(), 9954 diag::err_operator_new_delete_declared_in_namespace) 9955 << FnDecl->getDeclName(); 9956 } 9957 9958 if (isa<TranslationUnitDecl>(DC) && 9959 FnDecl->getStorageClass() == SC_Static) { 9960 return SemaRef.Diag(FnDecl->getLocation(), 9961 diag::err_operator_new_delete_declared_static) 9962 << FnDecl->getDeclName(); 9963 } 9964 9965 return false; 9966} 9967 9968static inline bool 9969CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9970 CanQualType ExpectedResultType, 9971 CanQualType ExpectedFirstParamType, 9972 unsigned DependentParamTypeDiag, 9973 unsigned InvalidParamTypeDiag) { 9974 QualType ResultType = 9975 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9976 9977 // Check that the result type is not dependent. 9978 if (ResultType->isDependentType()) 9979 return SemaRef.Diag(FnDecl->getLocation(), 9980 diag::err_operator_new_delete_dependent_result_type) 9981 << FnDecl->getDeclName() << ExpectedResultType; 9982 9983 // Check that the result type is what we expect. 9984 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9985 return SemaRef.Diag(FnDecl->getLocation(), 9986 diag::err_operator_new_delete_invalid_result_type) 9987 << FnDecl->getDeclName() << ExpectedResultType; 9988 9989 // A function template must have at least 2 parameters. 9990 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9991 return SemaRef.Diag(FnDecl->getLocation(), 9992 diag::err_operator_new_delete_template_too_few_parameters) 9993 << FnDecl->getDeclName(); 9994 9995 // The function decl must have at least 1 parameter. 9996 if (FnDecl->getNumParams() == 0) 9997 return SemaRef.Diag(FnDecl->getLocation(), 9998 diag::err_operator_new_delete_too_few_parameters) 9999 << FnDecl->getDeclName(); 10000 10001 // Check the first parameter type is not dependent. 10002 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 10003 if (FirstParamType->isDependentType()) 10004 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 10005 << FnDecl->getDeclName() << ExpectedFirstParamType; 10006 10007 // Check that the first parameter type is what we expect. 10008 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 10009 ExpectedFirstParamType) 10010 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 10011 << FnDecl->getDeclName() << ExpectedFirstParamType; 10012 10013 return false; 10014} 10015 10016static bool 10017CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 10018 // C++ [basic.stc.dynamic.allocation]p1: 10019 // A program is ill-formed if an allocation function is declared in a 10020 // namespace scope other than global scope or declared static in global 10021 // scope. 10022 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 10023 return true; 10024 10025 CanQualType SizeTy = 10026 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 10027 10028 // C++ [basic.stc.dynamic.allocation]p1: 10029 // The return type shall be void*. The first parameter shall have type 10030 // std::size_t. 10031 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 10032 SizeTy, 10033 diag::err_operator_new_dependent_param_type, 10034 diag::err_operator_new_param_type)) 10035 return true; 10036 10037 // C++ [basic.stc.dynamic.allocation]p1: 10038 // The first parameter shall not have an associated default argument. 10039 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 10040 return SemaRef.Diag(FnDecl->getLocation(), 10041 diag::err_operator_new_default_arg) 10042 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 10043 10044 return false; 10045} 10046 10047static bool 10048CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) { 10049 // C++ [basic.stc.dynamic.deallocation]p1: 10050 // A program is ill-formed if deallocation functions are declared in a 10051 // namespace scope other than global scope or declared static in global 10052 // scope. 10053 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 10054 return true; 10055 10056 // C++ [basic.stc.dynamic.deallocation]p2: 10057 // Each deallocation function shall return void and its first parameter 10058 // shall be void*. 10059 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 10060 SemaRef.Context.VoidPtrTy, 10061 diag::err_operator_delete_dependent_param_type, 10062 diag::err_operator_delete_param_type)) 10063 return true; 10064 10065 return false; 10066} 10067 10068/// CheckOverloadedOperatorDeclaration - Check whether the declaration 10069/// of this overloaded operator is well-formed. If so, returns false; 10070/// otherwise, emits appropriate diagnostics and returns true. 10071bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 10072 assert(FnDecl && FnDecl->isOverloadedOperator() && 10073 "Expected an overloaded operator declaration"); 10074 10075 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 10076 10077 // C++ [over.oper]p5: 10078 // The allocation and deallocation functions, operator new, 10079 // operator new[], operator delete and operator delete[], are 10080 // described completely in 3.7.3. The attributes and restrictions 10081 // found in the rest of this subclause do not apply to them unless 10082 // explicitly stated in 3.7.3. 10083 if (Op == OO_Delete || Op == OO_Array_Delete) 10084 return CheckOperatorDeleteDeclaration(*this, FnDecl); 10085 10086 if (Op == OO_New || Op == OO_Array_New) 10087 return CheckOperatorNewDeclaration(*this, FnDecl); 10088 10089 // C++ [over.oper]p6: 10090 // An operator function shall either be a non-static member 10091 // function or be a non-member function and have at least one 10092 // parameter whose type is a class, a reference to a class, an 10093 // enumeration, or a reference to an enumeration. 10094 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 10095 if (MethodDecl->isStatic()) 10096 return Diag(FnDecl->getLocation(), 10097 diag::err_operator_overload_static) << FnDecl->getDeclName(); 10098 } else { 10099 bool ClassOrEnumParam = false; 10100 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 10101 ParamEnd = FnDecl->param_end(); 10102 Param != ParamEnd; ++Param) { 10103 QualType ParamType = (*Param)->getType().getNonReferenceType(); 10104 if (ParamType->isDependentType() || ParamType->isRecordType() || 10105 ParamType->isEnumeralType()) { 10106 ClassOrEnumParam = true; 10107 break; 10108 } 10109 } 10110 10111 if (!ClassOrEnumParam) 10112 return Diag(FnDecl->getLocation(), 10113 diag::err_operator_overload_needs_class_or_enum) 10114 << FnDecl->getDeclName(); 10115 } 10116 10117 // C++ [over.oper]p8: 10118 // An operator function cannot have default arguments (8.3.6), 10119 // except where explicitly stated below. 10120 // 10121 // Only the function-call operator allows default arguments 10122 // (C++ [over.call]p1). 10123 if (Op != OO_Call) { 10124 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 10125 Param != FnDecl->param_end(); ++Param) { 10126 if ((*Param)->hasDefaultArg()) 10127 return Diag((*Param)->getLocation(), 10128 diag::err_operator_overload_default_arg) 10129 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 10130 } 10131 } 10132 10133 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 10134 { false, false, false } 10135#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 10136 , { Unary, Binary, MemberOnly } 10137#include "clang/Basic/OperatorKinds.def" 10138 }; 10139 10140 bool CanBeUnaryOperator = OperatorUses[Op][0]; 10141 bool CanBeBinaryOperator = OperatorUses[Op][1]; 10142 bool MustBeMemberOperator = OperatorUses[Op][2]; 10143 10144 // C++ [over.oper]p8: 10145 // [...] Operator functions cannot have more or fewer parameters 10146 // than the number required for the corresponding operator, as 10147 // described in the rest of this subclause. 10148 unsigned NumParams = FnDecl->getNumParams() 10149 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 10150 if (Op != OO_Call && 10151 ((NumParams == 1 && !CanBeUnaryOperator) || 10152 (NumParams == 2 && !CanBeBinaryOperator) || 10153 (NumParams < 1) || (NumParams > 2))) { 10154 // We have the wrong number of parameters. 10155 unsigned ErrorKind; 10156 if (CanBeUnaryOperator && CanBeBinaryOperator) { 10157 ErrorKind = 2; // 2 -> unary or binary. 10158 } else if (CanBeUnaryOperator) { 10159 ErrorKind = 0; // 0 -> unary 10160 } else { 10161 assert(CanBeBinaryOperator && 10162 "All non-call overloaded operators are unary or binary!"); 10163 ErrorKind = 1; // 1 -> binary 10164 } 10165 10166 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 10167 << FnDecl->getDeclName() << NumParams << ErrorKind; 10168 } 10169 10170 // Overloaded operators other than operator() cannot be variadic. 10171 if (Op != OO_Call && 10172 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 10173 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 10174 << FnDecl->getDeclName(); 10175 } 10176 10177 // Some operators must be non-static member functions. 10178 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 10179 return Diag(FnDecl->getLocation(), 10180 diag::err_operator_overload_must_be_member) 10181 << FnDecl->getDeclName(); 10182 } 10183 10184 // C++ [over.inc]p1: 10185 // The user-defined function called operator++ implements the 10186 // prefix and postfix ++ operator. If this function is a member 10187 // function with no parameters, or a non-member function with one 10188 // parameter of class or enumeration type, it defines the prefix 10189 // increment operator ++ for objects of that type. If the function 10190 // is a member function with one parameter (which shall be of type 10191 // int) or a non-member function with two parameters (the second 10192 // of which shall be of type int), it defines the postfix 10193 // increment operator ++ for objects of that type. 10194 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 10195 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 10196 bool ParamIsInt = false; 10197 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 10198 ParamIsInt = BT->getKind() == BuiltinType::Int; 10199 10200 if (!ParamIsInt) 10201 return Diag(LastParam->getLocation(), 10202 diag::err_operator_overload_post_incdec_must_be_int) 10203 << LastParam->getType() << (Op == OO_MinusMinus); 10204 } 10205 10206 return false; 10207} 10208 10209/// CheckLiteralOperatorDeclaration - Check whether the declaration 10210/// of this literal operator function is well-formed. If so, returns 10211/// false; otherwise, emits appropriate diagnostics and returns true. 10212bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 10213 if (isa<CXXMethodDecl>(FnDecl)) { 10214 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 10215 << FnDecl->getDeclName(); 10216 return true; 10217 } 10218 10219 if (FnDecl->isExternC()) { 10220 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 10221 return true; 10222 } 10223 10224 bool Valid = false; 10225 10226 // This might be the definition of a literal operator template. 10227 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 10228 // This might be a specialization of a literal operator template. 10229 if (!TpDecl) 10230 TpDecl = FnDecl->getPrimaryTemplate(); 10231 10232 // template <char...> type operator "" name() is the only valid template 10233 // signature, and the only valid signature with no parameters. 10234 if (TpDecl) { 10235 if (FnDecl->param_size() == 0) { 10236 // Must have only one template parameter 10237 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 10238 if (Params->size() == 1) { 10239 NonTypeTemplateParmDecl *PmDecl = 10240 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 10241 10242 // The template parameter must be a char parameter pack. 10243 if (PmDecl && PmDecl->isTemplateParameterPack() && 10244 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 10245 Valid = true; 10246 } 10247 } 10248 } else if (FnDecl->param_size()) { 10249 // Check the first parameter 10250 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 10251 10252 QualType T = (*Param)->getType().getUnqualifiedType(); 10253 10254 // unsigned long long int, long double, and any character type are allowed 10255 // as the only parameters. 10256 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 10257 Context.hasSameType(T, Context.LongDoubleTy) || 10258 Context.hasSameType(T, Context.CharTy) || 10259 Context.hasSameType(T, Context.WCharTy) || 10260 Context.hasSameType(T, Context.Char16Ty) || 10261 Context.hasSameType(T, Context.Char32Ty)) { 10262 if (++Param == FnDecl->param_end()) 10263 Valid = true; 10264 goto FinishedParams; 10265 } 10266 10267 // Otherwise it must be a pointer to const; let's strip those qualifiers. 10268 const PointerType *PT = T->getAs<PointerType>(); 10269 if (!PT) 10270 goto FinishedParams; 10271 T = PT->getPointeeType(); 10272 if (!T.isConstQualified() || T.isVolatileQualified()) 10273 goto FinishedParams; 10274 T = T.getUnqualifiedType(); 10275 10276 // Move on to the second parameter; 10277 ++Param; 10278 10279 // If there is no second parameter, the first must be a const char * 10280 if (Param == FnDecl->param_end()) { 10281 if (Context.hasSameType(T, Context.CharTy)) 10282 Valid = true; 10283 goto FinishedParams; 10284 } 10285 10286 // const char *, const wchar_t*, const char16_t*, and const char32_t* 10287 // are allowed as the first parameter to a two-parameter function 10288 if (!(Context.hasSameType(T, Context.CharTy) || 10289 Context.hasSameType(T, Context.WCharTy) || 10290 Context.hasSameType(T, Context.Char16Ty) || 10291 Context.hasSameType(T, Context.Char32Ty))) 10292 goto FinishedParams; 10293 10294 // The second and final parameter must be an std::size_t 10295 T = (*Param)->getType().getUnqualifiedType(); 10296 if (Context.hasSameType(T, Context.getSizeType()) && 10297 ++Param == FnDecl->param_end()) 10298 Valid = true; 10299 } 10300 10301 // FIXME: This diagnostic is absolutely terrible. 10302FinishedParams: 10303 if (!Valid) { 10304 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 10305 << FnDecl->getDeclName(); 10306 return true; 10307 } 10308 10309 // A parameter-declaration-clause containing a default argument is not 10310 // equivalent to any of the permitted forms. 10311 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 10312 ParamEnd = FnDecl->param_end(); 10313 Param != ParamEnd; ++Param) { 10314 if ((*Param)->hasDefaultArg()) { 10315 Diag((*Param)->getDefaultArgRange().getBegin(), 10316 diag::err_literal_operator_default_argument) 10317 << (*Param)->getDefaultArgRange(); 10318 break; 10319 } 10320 } 10321 10322 StringRef LiteralName 10323 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 10324 if (LiteralName[0] != '_') { 10325 // C++11 [usrlit.suffix]p1: 10326 // Literal suffix identifiers that do not start with an underscore 10327 // are reserved for future standardization. 10328 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 10329 } 10330 10331 return false; 10332} 10333 10334/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 10335/// linkage specification, including the language and (if present) 10336/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 10337/// the location of the language string literal, which is provided 10338/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 10339/// the '{' brace. Otherwise, this linkage specification does not 10340/// have any braces. 10341Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 10342 SourceLocation LangLoc, 10343 StringRef Lang, 10344 SourceLocation LBraceLoc) { 10345 LinkageSpecDecl::LanguageIDs Language; 10346 if (Lang == "\"C\"") 10347 Language = LinkageSpecDecl::lang_c; 10348 else if (Lang == "\"C++\"") 10349 Language = LinkageSpecDecl::lang_cxx; 10350 else { 10351 Diag(LangLoc, diag::err_bad_language); 10352 return 0; 10353 } 10354 10355 // FIXME: Add all the various semantics of linkage specifications 10356 10357 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 10358 ExternLoc, LangLoc, Language); 10359 CurContext->addDecl(D); 10360 PushDeclContext(S, D); 10361 return D; 10362} 10363 10364/// ActOnFinishLinkageSpecification - Complete the definition of 10365/// the C++ linkage specification LinkageSpec. If RBraceLoc is 10366/// valid, it's the position of the closing '}' brace in a linkage 10367/// specification that uses braces. 10368Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 10369 Decl *LinkageSpec, 10370 SourceLocation RBraceLoc) { 10371 if (LinkageSpec) { 10372 if (RBraceLoc.isValid()) { 10373 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 10374 LSDecl->setRBraceLoc(RBraceLoc); 10375 } 10376 PopDeclContext(); 10377 } 10378 return LinkageSpec; 10379} 10380 10381Decl *Sema::ActOnEmptyDeclaration(Scope *S, 10382 AttributeList *AttrList, 10383 SourceLocation SemiLoc) { 10384 Decl *ED = EmptyDecl::Create(Context, CurContext, SemiLoc); 10385 // Attribute declarations appertain to empty declaration so we handle 10386 // them here. 10387 if (AttrList) 10388 ProcessDeclAttributeList(S, ED, AttrList); 10389 10390 CurContext->addDecl(ED); 10391 return ED; 10392} 10393 10394/// \brief Perform semantic analysis for the variable declaration that 10395/// occurs within a C++ catch clause, returning the newly-created 10396/// variable. 10397VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 10398 TypeSourceInfo *TInfo, 10399 SourceLocation StartLoc, 10400 SourceLocation Loc, 10401 IdentifierInfo *Name) { 10402 bool Invalid = false; 10403 QualType ExDeclType = TInfo->getType(); 10404 10405 // Arrays and functions decay. 10406 if (ExDeclType->isArrayType()) 10407 ExDeclType = Context.getArrayDecayedType(ExDeclType); 10408 else if (ExDeclType->isFunctionType()) 10409 ExDeclType = Context.getPointerType(ExDeclType); 10410 10411 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 10412 // The exception-declaration shall not denote a pointer or reference to an 10413 // incomplete type, other than [cv] void*. 10414 // N2844 forbids rvalue references. 10415 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 10416 Diag(Loc, diag::err_catch_rvalue_ref); 10417 Invalid = true; 10418 } 10419 10420 QualType BaseType = ExDeclType; 10421 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 10422 unsigned DK = diag::err_catch_incomplete; 10423 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 10424 BaseType = Ptr->getPointeeType(); 10425 Mode = 1; 10426 DK = diag::err_catch_incomplete_ptr; 10427 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 10428 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 10429 BaseType = Ref->getPointeeType(); 10430 Mode = 2; 10431 DK = diag::err_catch_incomplete_ref; 10432 } 10433 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 10434 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 10435 Invalid = true; 10436 10437 if (!Invalid && !ExDeclType->isDependentType() && 10438 RequireNonAbstractType(Loc, ExDeclType, 10439 diag::err_abstract_type_in_decl, 10440 AbstractVariableType)) 10441 Invalid = true; 10442 10443 // Only the non-fragile NeXT runtime currently supports C++ catches 10444 // of ObjC types, and no runtime supports catching ObjC types by value. 10445 if (!Invalid && getLangOpts().ObjC1) { 10446 QualType T = ExDeclType; 10447 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 10448 T = RT->getPointeeType(); 10449 10450 if (T->isObjCObjectType()) { 10451 Diag(Loc, diag::err_objc_object_catch); 10452 Invalid = true; 10453 } else if (T->isObjCObjectPointerType()) { 10454 // FIXME: should this be a test for macosx-fragile specifically? 10455 if (getLangOpts().ObjCRuntime.isFragile()) 10456 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 10457 } 10458 } 10459 10460 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 10461 ExDeclType, TInfo, SC_None); 10462 ExDecl->setExceptionVariable(true); 10463 10464 // In ARC, infer 'retaining' for variables of retainable type. 10465 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 10466 Invalid = true; 10467 10468 if (!Invalid && !ExDeclType->isDependentType()) { 10469 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 10470 // Insulate this from anything else we might currently be parsing. 10471 EnterExpressionEvaluationContext scope(*this, PotentiallyEvaluated); 10472 10473 // C++ [except.handle]p16: 10474 // The object declared in an exception-declaration or, if the 10475 // exception-declaration does not specify a name, a temporary (12.2) is 10476 // copy-initialized (8.5) from the exception object. [...] 10477 // The object is destroyed when the handler exits, after the destruction 10478 // of any automatic objects initialized within the handler. 10479 // 10480 // We just pretend to initialize the object with itself, then make sure 10481 // it can be destroyed later. 10482 QualType initType = ExDeclType; 10483 10484 InitializedEntity entity = 10485 InitializedEntity::InitializeVariable(ExDecl); 10486 InitializationKind initKind = 10487 InitializationKind::CreateCopy(Loc, SourceLocation()); 10488 10489 Expr *opaqueValue = 10490 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 10491 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 10492 ExprResult result = sequence.Perform(*this, entity, initKind, 10493 MultiExprArg(&opaqueValue, 1)); 10494 if (result.isInvalid()) 10495 Invalid = true; 10496 else { 10497 // If the constructor used was non-trivial, set this as the 10498 // "initializer". 10499 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 10500 if (!construct->getConstructor()->isTrivial()) { 10501 Expr *init = MaybeCreateExprWithCleanups(construct); 10502 ExDecl->setInit(init); 10503 } 10504 10505 // And make sure it's destructable. 10506 FinalizeVarWithDestructor(ExDecl, recordType); 10507 } 10508 } 10509 } 10510 10511 if (Invalid) 10512 ExDecl->setInvalidDecl(); 10513 10514 return ExDecl; 10515} 10516 10517/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 10518/// handler. 10519Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 10520 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10521 bool Invalid = D.isInvalidType(); 10522 10523 // Check for unexpanded parameter packs. 10524 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 10525 UPPC_ExceptionType)) { 10526 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 10527 D.getIdentifierLoc()); 10528 Invalid = true; 10529 } 10530 10531 IdentifierInfo *II = D.getIdentifier(); 10532 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 10533 LookupOrdinaryName, 10534 ForRedeclaration)) { 10535 // The scope should be freshly made just for us. There is just no way 10536 // it contains any previous declaration. 10537 assert(!S->isDeclScope(PrevDecl)); 10538 if (PrevDecl->isTemplateParameter()) { 10539 // Maybe we will complain about the shadowed template parameter. 10540 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 10541 PrevDecl = 0; 10542 } 10543 } 10544 10545 if (D.getCXXScopeSpec().isSet() && !Invalid) { 10546 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 10547 << D.getCXXScopeSpec().getRange(); 10548 Invalid = true; 10549 } 10550 10551 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 10552 D.getLocStart(), 10553 D.getIdentifierLoc(), 10554 D.getIdentifier()); 10555 if (Invalid) 10556 ExDecl->setInvalidDecl(); 10557 10558 // Add the exception declaration into this scope. 10559 if (II) 10560 PushOnScopeChains(ExDecl, S); 10561 else 10562 CurContext->addDecl(ExDecl); 10563 10564 ProcessDeclAttributes(S, ExDecl, D); 10565 return ExDecl; 10566} 10567 10568Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 10569 Expr *AssertExpr, 10570 Expr *AssertMessageExpr, 10571 SourceLocation RParenLoc) { 10572 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 10573 10574 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 10575 return 0; 10576 10577 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 10578 AssertMessage, RParenLoc, false); 10579} 10580 10581Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 10582 Expr *AssertExpr, 10583 StringLiteral *AssertMessage, 10584 SourceLocation RParenLoc, 10585 bool Failed) { 10586 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 10587 !Failed) { 10588 // In a static_assert-declaration, the constant-expression shall be a 10589 // constant expression that can be contextually converted to bool. 10590 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 10591 if (Converted.isInvalid()) 10592 Failed = true; 10593 10594 llvm::APSInt Cond; 10595 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 10596 diag::err_static_assert_expression_is_not_constant, 10597 /*AllowFold=*/false).isInvalid()) 10598 Failed = true; 10599 10600 if (!Failed && !Cond) { 10601 SmallString<256> MsgBuffer; 10602 llvm::raw_svector_ostream Msg(MsgBuffer); 10603 AssertMessage->printPretty(Msg, 0, getPrintingPolicy()); 10604 Diag(StaticAssertLoc, diag::err_static_assert_failed) 10605 << Msg.str() << AssertExpr->getSourceRange(); 10606 Failed = true; 10607 } 10608 } 10609 10610 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 10611 AssertExpr, AssertMessage, RParenLoc, 10612 Failed); 10613 10614 CurContext->addDecl(Decl); 10615 return Decl; 10616} 10617 10618/// \brief Perform semantic analysis of the given friend type declaration. 10619/// 10620/// \returns A friend declaration that. 10621FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart, 10622 SourceLocation FriendLoc, 10623 TypeSourceInfo *TSInfo) { 10624 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 10625 10626 QualType T = TSInfo->getType(); 10627 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 10628 10629 // C++03 [class.friend]p2: 10630 // An elaborated-type-specifier shall be used in a friend declaration 10631 // for a class.* 10632 // 10633 // * The class-key of the elaborated-type-specifier is required. 10634 if (!ActiveTemplateInstantiations.empty()) { 10635 // Do not complain about the form of friend template types during 10636 // template instantiation; we will already have complained when the 10637 // template was declared. 10638 } else { 10639 if (!T->isElaboratedTypeSpecifier()) { 10640 // If we evaluated the type to a record type, suggest putting 10641 // a tag in front. 10642 if (const RecordType *RT = T->getAs<RecordType>()) { 10643 RecordDecl *RD = RT->getDecl(); 10644 10645 std::string InsertionText = std::string(" ") + RD->getKindName(); 10646 10647 Diag(TypeRange.getBegin(), 10648 getLangOpts().CPlusPlus11 ? 10649 diag::warn_cxx98_compat_unelaborated_friend_type : 10650 diag::ext_unelaborated_friend_type) 10651 << (unsigned) RD->getTagKind() 10652 << T 10653 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 10654 InsertionText); 10655 } else { 10656 Diag(FriendLoc, 10657 getLangOpts().CPlusPlus11 ? 10658 diag::warn_cxx98_compat_nonclass_type_friend : 10659 diag::ext_nonclass_type_friend) 10660 << T 10661 << TypeRange; 10662 } 10663 } else if (T->getAs<EnumType>()) { 10664 Diag(FriendLoc, 10665 getLangOpts().CPlusPlus11 ? 10666 diag::warn_cxx98_compat_enum_friend : 10667 diag::ext_enum_friend) 10668 << T 10669 << TypeRange; 10670 } 10671 10672 // C++11 [class.friend]p3: 10673 // A friend declaration that does not declare a function shall have one 10674 // of the following forms: 10675 // friend elaborated-type-specifier ; 10676 // friend simple-type-specifier ; 10677 // friend typename-specifier ; 10678 if (getLangOpts().CPlusPlus11 && LocStart != FriendLoc) 10679 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T; 10680 } 10681 10682 // If the type specifier in a friend declaration designates a (possibly 10683 // cv-qualified) class type, that class is declared as a friend; otherwise, 10684 // the friend declaration is ignored. 10685 return FriendDecl::Create(Context, CurContext, LocStart, TSInfo, FriendLoc); 10686} 10687 10688/// Handle a friend tag declaration where the scope specifier was 10689/// templated. 10690Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 10691 unsigned TagSpec, SourceLocation TagLoc, 10692 CXXScopeSpec &SS, 10693 IdentifierInfo *Name, 10694 SourceLocation NameLoc, 10695 AttributeList *Attr, 10696 MultiTemplateParamsArg TempParamLists) { 10697 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 10698 10699 bool isExplicitSpecialization = false; 10700 bool Invalid = false; 10701 10702 if (TemplateParameterList *TemplateParams 10703 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 10704 TempParamLists.data(), 10705 TempParamLists.size(), 10706 /*friend*/ true, 10707 isExplicitSpecialization, 10708 Invalid)) { 10709 if (TemplateParams->size() > 0) { 10710 // This is a declaration of a class template. 10711 if (Invalid) 10712 return 0; 10713 10714 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 10715 SS, Name, NameLoc, Attr, 10716 TemplateParams, AS_public, 10717 /*ModulePrivateLoc=*/SourceLocation(), 10718 TempParamLists.size() - 1, 10719 TempParamLists.data()).take(); 10720 } else { 10721 // The "template<>" header is extraneous. 10722 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 10723 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 10724 isExplicitSpecialization = true; 10725 } 10726 } 10727 10728 if (Invalid) return 0; 10729 10730 bool isAllExplicitSpecializations = true; 10731 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 10732 if (TempParamLists[I]->size()) { 10733 isAllExplicitSpecializations = false; 10734 break; 10735 } 10736 } 10737 10738 // FIXME: don't ignore attributes. 10739 10740 // If it's explicit specializations all the way down, just forget 10741 // about the template header and build an appropriate non-templated 10742 // friend. TODO: for source fidelity, remember the headers. 10743 if (isAllExplicitSpecializations) { 10744 if (SS.isEmpty()) { 10745 bool Owned = false; 10746 bool IsDependent = false; 10747 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 10748 Attr, AS_public, 10749 /*ModulePrivateLoc=*/SourceLocation(), 10750 MultiTemplateParamsArg(), Owned, IsDependent, 10751 /*ScopedEnumKWLoc=*/SourceLocation(), 10752 /*ScopedEnumUsesClassTag=*/false, 10753 /*UnderlyingType=*/TypeResult()); 10754 } 10755 10756 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 10757 ElaboratedTypeKeyword Keyword 10758 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10759 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 10760 *Name, NameLoc); 10761 if (T.isNull()) 10762 return 0; 10763 10764 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10765 if (isa<DependentNameType>(T)) { 10766 DependentNameTypeLoc TL = 10767 TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); 10768 TL.setElaboratedKeywordLoc(TagLoc); 10769 TL.setQualifierLoc(QualifierLoc); 10770 TL.setNameLoc(NameLoc); 10771 } else { 10772 ElaboratedTypeLoc TL = TSI->getTypeLoc().castAs<ElaboratedTypeLoc>(); 10773 TL.setElaboratedKeywordLoc(TagLoc); 10774 TL.setQualifierLoc(QualifierLoc); 10775 TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(NameLoc); 10776 } 10777 10778 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10779 TSI, FriendLoc, TempParamLists); 10780 Friend->setAccess(AS_public); 10781 CurContext->addDecl(Friend); 10782 return Friend; 10783 } 10784 10785 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 10786 10787 10788 10789 // Handle the case of a templated-scope friend class. e.g. 10790 // template <class T> class A<T>::B; 10791 // FIXME: we don't support these right now. 10792 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10793 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10794 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10795 DependentNameTypeLoc TL = TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); 10796 TL.setElaboratedKeywordLoc(TagLoc); 10797 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10798 TL.setNameLoc(NameLoc); 10799 10800 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10801 TSI, FriendLoc, TempParamLists); 10802 Friend->setAccess(AS_public); 10803 Friend->setUnsupportedFriend(true); 10804 CurContext->addDecl(Friend); 10805 return Friend; 10806} 10807 10808 10809/// Handle a friend type declaration. This works in tandem with 10810/// ActOnTag. 10811/// 10812/// Notes on friend class templates: 10813/// 10814/// We generally treat friend class declarations as if they were 10815/// declaring a class. So, for example, the elaborated type specifier 10816/// in a friend declaration is required to obey the restrictions of a 10817/// class-head (i.e. no typedefs in the scope chain), template 10818/// parameters are required to match up with simple template-ids, &c. 10819/// However, unlike when declaring a template specialization, it's 10820/// okay to refer to a template specialization without an empty 10821/// template parameter declaration, e.g. 10822/// friend class A<T>::B<unsigned>; 10823/// We permit this as a special case; if there are any template 10824/// parameters present at all, require proper matching, i.e. 10825/// template <> template \<class T> friend class A<int>::B; 10826Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10827 MultiTemplateParamsArg TempParams) { 10828 SourceLocation Loc = DS.getLocStart(); 10829 10830 assert(DS.isFriendSpecified()); 10831 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10832 10833 // Try to convert the decl specifier to a type. This works for 10834 // friend templates because ActOnTag never produces a ClassTemplateDecl 10835 // for a TUK_Friend. 10836 Declarator TheDeclarator(DS, Declarator::MemberContext); 10837 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10838 QualType T = TSI->getType(); 10839 if (TheDeclarator.isInvalidType()) 10840 return 0; 10841 10842 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10843 return 0; 10844 10845 // This is definitely an error in C++98. It's probably meant to 10846 // be forbidden in C++0x, too, but the specification is just 10847 // poorly written. 10848 // 10849 // The problem is with declarations like the following: 10850 // template <T> friend A<T>::foo; 10851 // where deciding whether a class C is a friend or not now hinges 10852 // on whether there exists an instantiation of A that causes 10853 // 'foo' to equal C. There are restrictions on class-heads 10854 // (which we declare (by fiat) elaborated friend declarations to 10855 // be) that makes this tractable. 10856 // 10857 // FIXME: handle "template <> friend class A<T>;", which 10858 // is possibly well-formed? Who even knows? 10859 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10860 Diag(Loc, diag::err_tagless_friend_type_template) 10861 << DS.getSourceRange(); 10862 return 0; 10863 } 10864 10865 // C++98 [class.friend]p1: A friend of a class is a function 10866 // or class that is not a member of the class . . . 10867 // This is fixed in DR77, which just barely didn't make the C++03 10868 // deadline. It's also a very silly restriction that seriously 10869 // affects inner classes and which nobody else seems to implement; 10870 // thus we never diagnose it, not even in -pedantic. 10871 // 10872 // But note that we could warn about it: it's always useless to 10873 // friend one of your own members (it's not, however, worthless to 10874 // friend a member of an arbitrary specialization of your template). 10875 10876 Decl *D; 10877 if (unsigned NumTempParamLists = TempParams.size()) 10878 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10879 NumTempParamLists, 10880 TempParams.data(), 10881 TSI, 10882 DS.getFriendSpecLoc()); 10883 else 10884 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10885 10886 if (!D) 10887 return 0; 10888 10889 D->setAccess(AS_public); 10890 CurContext->addDecl(D); 10891 10892 return D; 10893} 10894 10895NamedDecl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10896 MultiTemplateParamsArg TemplateParams) { 10897 const DeclSpec &DS = D.getDeclSpec(); 10898 10899 assert(DS.isFriendSpecified()); 10900 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10901 10902 SourceLocation Loc = D.getIdentifierLoc(); 10903 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10904 10905 // C++ [class.friend]p1 10906 // A friend of a class is a function or class.... 10907 // Note that this sees through typedefs, which is intended. 10908 // It *doesn't* see through dependent types, which is correct 10909 // according to [temp.arg.type]p3: 10910 // If a declaration acquires a function type through a 10911 // type dependent on a template-parameter and this causes 10912 // a declaration that does not use the syntactic form of a 10913 // function declarator to have a function type, the program 10914 // is ill-formed. 10915 if (!TInfo->getType()->isFunctionType()) { 10916 Diag(Loc, diag::err_unexpected_friend); 10917 10918 // It might be worthwhile to try to recover by creating an 10919 // appropriate declaration. 10920 return 0; 10921 } 10922 10923 // C++ [namespace.memdef]p3 10924 // - If a friend declaration in a non-local class first declares a 10925 // class or function, the friend class or function is a member 10926 // of the innermost enclosing namespace. 10927 // - The name of the friend is not found by simple name lookup 10928 // until a matching declaration is provided in that namespace 10929 // scope (either before or after the class declaration granting 10930 // friendship). 10931 // - If a friend function is called, its name may be found by the 10932 // name lookup that considers functions from namespaces and 10933 // classes associated with the types of the function arguments. 10934 // - When looking for a prior declaration of a class or a function 10935 // declared as a friend, scopes outside the innermost enclosing 10936 // namespace scope are not considered. 10937 10938 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10939 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10940 DeclarationName Name = NameInfo.getName(); 10941 assert(Name); 10942 10943 // Check for unexpanded parameter packs. 10944 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10945 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10946 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10947 return 0; 10948 10949 // The context we found the declaration in, or in which we should 10950 // create the declaration. 10951 DeclContext *DC; 10952 Scope *DCScope = S; 10953 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10954 ForRedeclaration); 10955 10956 // FIXME: there are different rules in local classes 10957 10958 // There are four cases here. 10959 // - There's no scope specifier, in which case we just go to the 10960 // appropriate scope and look for a function or function template 10961 // there as appropriate. 10962 // Recover from invalid scope qualifiers as if they just weren't there. 10963 if (SS.isInvalid() || !SS.isSet()) { 10964 // C++0x [namespace.memdef]p3: 10965 // If the name in a friend declaration is neither qualified nor 10966 // a template-id and the declaration is a function or an 10967 // elaborated-type-specifier, the lookup to determine whether 10968 // the entity has been previously declared shall not consider 10969 // any scopes outside the innermost enclosing namespace. 10970 // C++0x [class.friend]p11: 10971 // If a friend declaration appears in a local class and the name 10972 // specified is an unqualified name, a prior declaration is 10973 // looked up without considering scopes that are outside the 10974 // innermost enclosing non-class scope. For a friend function 10975 // declaration, if there is no prior declaration, the program is 10976 // ill-formed. 10977 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10978 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10979 10980 // Find the appropriate context according to the above. 10981 DC = CurContext; 10982 while (true) { 10983 // Skip class contexts. If someone can cite chapter and verse 10984 // for this behavior, that would be nice --- it's what GCC and 10985 // EDG do, and it seems like a reasonable intent, but the spec 10986 // really only says that checks for unqualified existing 10987 // declarations should stop at the nearest enclosing namespace, 10988 // not that they should only consider the nearest enclosing 10989 // namespace. 10990 while (DC->isRecord() || DC->isTransparentContext()) 10991 DC = DC->getParent(); 10992 10993 LookupQualifiedName(Previous, DC); 10994 10995 // TODO: decide what we think about using declarations. 10996 if (isLocal || !Previous.empty()) 10997 break; 10998 10999 if (isTemplateId) { 11000 if (isa<TranslationUnitDecl>(DC)) break; 11001 } else { 11002 if (DC->isFileContext()) break; 11003 } 11004 DC = DC->getParent(); 11005 } 11006 11007 DCScope = getScopeForDeclContext(S, DC); 11008 11009 // C++ [class.friend]p6: 11010 // A function can be defined in a friend declaration of a class if and 11011 // only if the class is a non-local class (9.8), the function name is 11012 // unqualified, and the function has namespace scope. 11013 if (isLocal && D.isFunctionDefinition()) { 11014 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 11015 } 11016 11017 // - There's a non-dependent scope specifier, in which case we 11018 // compute it and do a previous lookup there for a function 11019 // or function template. 11020 } else if (!SS.getScopeRep()->isDependent()) { 11021 DC = computeDeclContext(SS); 11022 if (!DC) return 0; 11023 11024 if (RequireCompleteDeclContext(SS, DC)) return 0; 11025 11026 LookupQualifiedName(Previous, DC); 11027 11028 // Ignore things found implicitly in the wrong scope. 11029 // TODO: better diagnostics for this case. Suggesting the right 11030 // qualified scope would be nice... 11031 LookupResult::Filter F = Previous.makeFilter(); 11032 while (F.hasNext()) { 11033 NamedDecl *D = F.next(); 11034 if (!DC->InEnclosingNamespaceSetOf( 11035 D->getDeclContext()->getRedeclContext())) 11036 F.erase(); 11037 } 11038 F.done(); 11039 11040 if (Previous.empty()) { 11041 D.setInvalidType(); 11042 Diag(Loc, diag::err_qualified_friend_not_found) 11043 << Name << TInfo->getType(); 11044 return 0; 11045 } 11046 11047 // C++ [class.friend]p1: A friend of a class is a function or 11048 // class that is not a member of the class . . . 11049 if (DC->Equals(CurContext)) 11050 Diag(DS.getFriendSpecLoc(), 11051 getLangOpts().CPlusPlus11 ? 11052 diag::warn_cxx98_compat_friend_is_member : 11053 diag::err_friend_is_member); 11054 11055 if (D.isFunctionDefinition()) { 11056 // C++ [class.friend]p6: 11057 // A function can be defined in a friend declaration of a class if and 11058 // only if the class is a non-local class (9.8), the function name is 11059 // unqualified, and the function has namespace scope. 11060 SemaDiagnosticBuilder DB 11061 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 11062 11063 DB << SS.getScopeRep(); 11064 if (DC->isFileContext()) 11065 DB << FixItHint::CreateRemoval(SS.getRange()); 11066 SS.clear(); 11067 } 11068 11069 // - There's a scope specifier that does not match any template 11070 // parameter lists, in which case we use some arbitrary context, 11071 // create a method or method template, and wait for instantiation. 11072 // - There's a scope specifier that does match some template 11073 // parameter lists, which we don't handle right now. 11074 } else { 11075 if (D.isFunctionDefinition()) { 11076 // C++ [class.friend]p6: 11077 // A function can be defined in a friend declaration of a class if and 11078 // only if the class is a non-local class (9.8), the function name is 11079 // unqualified, and the function has namespace scope. 11080 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 11081 << SS.getScopeRep(); 11082 } 11083 11084 DC = CurContext; 11085 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 11086 } 11087 11088 if (!DC->isRecord()) { 11089 // This implies that it has to be an operator or function. 11090 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 11091 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 11092 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 11093 Diag(Loc, diag::err_introducing_special_friend) << 11094 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 11095 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 11096 return 0; 11097 } 11098 } 11099 11100 // FIXME: This is an egregious hack to cope with cases where the scope stack 11101 // does not contain the declaration context, i.e., in an out-of-line 11102 // definition of a class. 11103 Scope FakeDCScope(S, Scope::DeclScope, Diags); 11104 if (!DCScope) { 11105 FakeDCScope.setEntity(DC); 11106 DCScope = &FakeDCScope; 11107 } 11108 11109 bool AddToScope = true; 11110 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 11111 TemplateParams, AddToScope); 11112 if (!ND) return 0; 11113 11114 assert(ND->getDeclContext() == DC); 11115 assert(ND->getLexicalDeclContext() == CurContext); 11116 11117 // Add the function declaration to the appropriate lookup tables, 11118 // adjusting the redeclarations list as necessary. We don't 11119 // want to do this yet if the friending class is dependent. 11120 // 11121 // Also update the scope-based lookup if the target context's 11122 // lookup context is in lexical scope. 11123 if (!CurContext->isDependentContext()) { 11124 DC = DC->getRedeclContext(); 11125 DC->makeDeclVisibleInContext(ND); 11126 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 11127 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 11128 } 11129 11130 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 11131 D.getIdentifierLoc(), ND, 11132 DS.getFriendSpecLoc()); 11133 FrD->setAccess(AS_public); 11134 CurContext->addDecl(FrD); 11135 11136 if (ND->isInvalidDecl()) { 11137 FrD->setInvalidDecl(); 11138 } else { 11139 if (DC->isRecord()) CheckFriendAccess(ND); 11140 11141 FunctionDecl *FD; 11142 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 11143 FD = FTD->getTemplatedDecl(); 11144 else 11145 FD = cast<FunctionDecl>(ND); 11146 11147 // Mark templated-scope function declarations as unsupported. 11148 if (FD->getNumTemplateParameterLists()) 11149 FrD->setUnsupportedFriend(true); 11150 } 11151 11152 return ND; 11153} 11154 11155void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 11156 AdjustDeclIfTemplate(Dcl); 11157 11158 FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(Dcl); 11159 if (!Fn) { 11160 Diag(DelLoc, diag::err_deleted_non_function); 11161 return; 11162 } 11163 11164 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 11165 // Don't consider the implicit declaration we generate for explicit 11166 // specializations. FIXME: Do not generate these implicit declarations. 11167 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 11168 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 11169 Diag(DelLoc, diag::err_deleted_decl_not_first); 11170 Diag(Prev->getLocation(), diag::note_previous_declaration); 11171 } 11172 // If the declaration wasn't the first, we delete the function anyway for 11173 // recovery. 11174 Fn = Fn->getCanonicalDecl(); 11175 } 11176 11177 if (Fn->isDeleted()) 11178 return; 11179 11180 // See if we're deleting a function which is already known to override a 11181 // non-deleted virtual function. 11182 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Fn)) { 11183 bool IssuedDiagnostic = false; 11184 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 11185 E = MD->end_overridden_methods(); 11186 I != E; ++I) { 11187 if (!(*MD->begin_overridden_methods())->isDeleted()) { 11188 if (!IssuedDiagnostic) { 11189 Diag(DelLoc, diag::err_deleted_override) << MD->getDeclName(); 11190 IssuedDiagnostic = true; 11191 } 11192 Diag((*I)->getLocation(), diag::note_overridden_virtual_function); 11193 } 11194 } 11195 } 11196 11197 Fn->setDeletedAsWritten(); 11198} 11199 11200void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 11201 CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Dcl); 11202 11203 if (MD) { 11204 if (MD->getParent()->isDependentType()) { 11205 MD->setDefaulted(); 11206 MD->setExplicitlyDefaulted(); 11207 return; 11208 } 11209 11210 CXXSpecialMember Member = getSpecialMember(MD); 11211 if (Member == CXXInvalid) { 11212 Diag(DefaultLoc, diag::err_default_special_members); 11213 return; 11214 } 11215 11216 MD->setDefaulted(); 11217 MD->setExplicitlyDefaulted(); 11218 11219 // If this definition appears within the record, do the checking when 11220 // the record is complete. 11221 const FunctionDecl *Primary = MD; 11222 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern()) 11223 // Find the uninstantiated declaration that actually had the '= default' 11224 // on it. 11225 Pattern->isDefined(Primary); 11226 11227 // If the method was defaulted on its first declaration, we will have 11228 // already performed the checking in CheckCompletedCXXClass. Such a 11229 // declaration doesn't trigger an implicit definition. 11230 if (Primary == Primary->getCanonicalDecl()) 11231 return; 11232 11233 CheckExplicitlyDefaultedSpecialMember(MD); 11234 11235 // The exception specification is needed because we are defining the 11236 // function. 11237 ResolveExceptionSpec(DefaultLoc, 11238 MD->getType()->castAs<FunctionProtoType>()); 11239 11240 switch (Member) { 11241 case CXXDefaultConstructor: { 11242 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 11243 if (!CD->isInvalidDecl()) 11244 DefineImplicitDefaultConstructor(DefaultLoc, CD); 11245 break; 11246 } 11247 11248 case CXXCopyConstructor: { 11249 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 11250 if (!CD->isInvalidDecl()) 11251 DefineImplicitCopyConstructor(DefaultLoc, CD); 11252 break; 11253 } 11254 11255 case CXXCopyAssignment: { 11256 if (!MD->isInvalidDecl()) 11257 DefineImplicitCopyAssignment(DefaultLoc, MD); 11258 break; 11259 } 11260 11261 case CXXDestructor: { 11262 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 11263 if (!DD->isInvalidDecl()) 11264 DefineImplicitDestructor(DefaultLoc, DD); 11265 break; 11266 } 11267 11268 case CXXMoveConstructor: { 11269 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 11270 if (!CD->isInvalidDecl()) 11271 DefineImplicitMoveConstructor(DefaultLoc, CD); 11272 break; 11273 } 11274 11275 case CXXMoveAssignment: { 11276 if (!MD->isInvalidDecl()) 11277 DefineImplicitMoveAssignment(DefaultLoc, MD); 11278 break; 11279 } 11280 11281 case CXXInvalid: 11282 llvm_unreachable("Invalid special member."); 11283 } 11284 } else { 11285 Diag(DefaultLoc, diag::err_default_special_members); 11286 } 11287} 11288 11289static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 11290 for (Stmt::child_range CI = S->children(); CI; ++CI) { 11291 Stmt *SubStmt = *CI; 11292 if (!SubStmt) 11293 continue; 11294 if (isa<ReturnStmt>(SubStmt)) 11295 Self.Diag(SubStmt->getLocStart(), 11296 diag::err_return_in_constructor_handler); 11297 if (!isa<Expr>(SubStmt)) 11298 SearchForReturnInStmt(Self, SubStmt); 11299 } 11300} 11301 11302void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 11303 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 11304 CXXCatchStmt *Handler = TryBlock->getHandler(I); 11305 SearchForReturnInStmt(*this, Handler); 11306 } 11307} 11308 11309bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 11310 const CXXMethodDecl *Old) { 11311 const FunctionType *NewFT = New->getType()->getAs<FunctionType>(); 11312 const FunctionType *OldFT = Old->getType()->getAs<FunctionType>(); 11313 11314 CallingConv NewCC = NewFT->getCallConv(), OldCC = OldFT->getCallConv(); 11315 11316 // If the calling conventions match, everything is fine 11317 if (NewCC == OldCC) 11318 return false; 11319 11320 // If either of the calling conventions are set to "default", we need to pick 11321 // something more sensible based on the target. This supports code where the 11322 // one method explicitly sets thiscall, and another has no explicit calling 11323 // convention. 11324 CallingConv Default = 11325 Context.getTargetInfo().getDefaultCallingConv(TargetInfo::CCMT_Member); 11326 if (NewCC == CC_Default) 11327 NewCC = Default; 11328 if (OldCC == CC_Default) 11329 OldCC = Default; 11330 11331 // If the calling conventions still don't match, then report the error 11332 if (NewCC != OldCC) { 11333 Diag(New->getLocation(), 11334 diag::err_conflicting_overriding_cc_attributes) 11335 << New->getDeclName() << New->getType() << Old->getType(); 11336 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11337 return true; 11338 } 11339 11340 return false; 11341} 11342 11343bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 11344 const CXXMethodDecl *Old) { 11345 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 11346 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 11347 11348 if (Context.hasSameType(NewTy, OldTy) || 11349 NewTy->isDependentType() || OldTy->isDependentType()) 11350 return false; 11351 11352 // Check if the return types are covariant 11353 QualType NewClassTy, OldClassTy; 11354 11355 /// Both types must be pointers or references to classes. 11356 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 11357 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 11358 NewClassTy = NewPT->getPointeeType(); 11359 OldClassTy = OldPT->getPointeeType(); 11360 } 11361 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 11362 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 11363 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 11364 NewClassTy = NewRT->getPointeeType(); 11365 OldClassTy = OldRT->getPointeeType(); 11366 } 11367 } 11368 } 11369 11370 // The return types aren't either both pointers or references to a class type. 11371 if (NewClassTy.isNull()) { 11372 Diag(New->getLocation(), 11373 diag::err_different_return_type_for_overriding_virtual_function) 11374 << New->getDeclName() << NewTy << OldTy; 11375 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11376 11377 return true; 11378 } 11379 11380 // C++ [class.virtual]p6: 11381 // If the return type of D::f differs from the return type of B::f, the 11382 // class type in the return type of D::f shall be complete at the point of 11383 // declaration of D::f or shall be the class type D. 11384 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 11385 if (!RT->isBeingDefined() && 11386 RequireCompleteType(New->getLocation(), NewClassTy, 11387 diag::err_covariant_return_incomplete, 11388 New->getDeclName())) 11389 return true; 11390 } 11391 11392 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 11393 // Check if the new class derives from the old class. 11394 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 11395 Diag(New->getLocation(), 11396 diag::err_covariant_return_not_derived) 11397 << New->getDeclName() << NewTy << OldTy; 11398 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11399 return true; 11400 } 11401 11402 // Check if we the conversion from derived to base is valid. 11403 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 11404 diag::err_covariant_return_inaccessible_base, 11405 diag::err_covariant_return_ambiguous_derived_to_base_conv, 11406 // FIXME: Should this point to the return type? 11407 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 11408 // FIXME: this note won't trigger for delayed access control 11409 // diagnostics, and it's impossible to get an undelayed error 11410 // here from access control during the original parse because 11411 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 11412 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11413 return true; 11414 } 11415 } 11416 11417 // The qualifiers of the return types must be the same. 11418 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 11419 Diag(New->getLocation(), 11420 diag::err_covariant_return_type_different_qualifications) 11421 << New->getDeclName() << NewTy << OldTy; 11422 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11423 return true; 11424 }; 11425 11426 11427 // The new class type must have the same or less qualifiers as the old type. 11428 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 11429 Diag(New->getLocation(), 11430 diag::err_covariant_return_type_class_type_more_qualified) 11431 << New->getDeclName() << NewTy << OldTy; 11432 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11433 return true; 11434 }; 11435 11436 return false; 11437} 11438 11439/// \brief Mark the given method pure. 11440/// 11441/// \param Method the method to be marked pure. 11442/// 11443/// \param InitRange the source range that covers the "0" initializer. 11444bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 11445 SourceLocation EndLoc = InitRange.getEnd(); 11446 if (EndLoc.isValid()) 11447 Method->setRangeEnd(EndLoc); 11448 11449 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 11450 Method->setPure(); 11451 return false; 11452 } 11453 11454 if (!Method->isInvalidDecl()) 11455 Diag(Method->getLocation(), diag::err_non_virtual_pure) 11456 << Method->getDeclName() << InitRange; 11457 return true; 11458} 11459 11460/// \brief Determine whether the given declaration is a static data member. 11461static bool isStaticDataMember(Decl *D) { 11462 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 11463 if (!Var) 11464 return false; 11465 11466 return Var->isStaticDataMember(); 11467} 11468/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 11469/// an initializer for the out-of-line declaration 'Dcl'. The scope 11470/// is a fresh scope pushed for just this purpose. 11471/// 11472/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 11473/// static data member of class X, names should be looked up in the scope of 11474/// class X. 11475void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 11476 // If there is no declaration, there was an error parsing it. 11477 if (D == 0 || D->isInvalidDecl()) return; 11478 11479 // We should only get called for declarations with scope specifiers, like: 11480 // int foo::bar; 11481 assert(D->isOutOfLine()); 11482 EnterDeclaratorContext(S, D->getDeclContext()); 11483 11484 // If we are parsing the initializer for a static data member, push a 11485 // new expression evaluation context that is associated with this static 11486 // data member. 11487 if (isStaticDataMember(D)) 11488 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 11489} 11490 11491/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 11492/// initializer for the out-of-line declaration 'D'. 11493void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 11494 // If there is no declaration, there was an error parsing it. 11495 if (D == 0 || D->isInvalidDecl()) return; 11496 11497 if (isStaticDataMember(D)) 11498 PopExpressionEvaluationContext(); 11499 11500 assert(D->isOutOfLine()); 11501 ExitDeclaratorContext(S); 11502} 11503 11504/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 11505/// C++ if/switch/while/for statement. 11506/// e.g: "if (int x = f()) {...}" 11507DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 11508 // C++ 6.4p2: 11509 // The declarator shall not specify a function or an array. 11510 // The type-specifier-seq shall not contain typedef and shall not declare a 11511 // new class or enumeration. 11512 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 11513 "Parser allowed 'typedef' as storage class of condition decl."); 11514 11515 Decl *Dcl = ActOnDeclarator(S, D); 11516 if (!Dcl) 11517 return true; 11518 11519 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 11520 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 11521 << D.getSourceRange(); 11522 return true; 11523 } 11524 11525 return Dcl; 11526} 11527 11528void Sema::LoadExternalVTableUses() { 11529 if (!ExternalSource) 11530 return; 11531 11532 SmallVector<ExternalVTableUse, 4> VTables; 11533 ExternalSource->ReadUsedVTables(VTables); 11534 SmallVector<VTableUse, 4> NewUses; 11535 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 11536 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 11537 = VTablesUsed.find(VTables[I].Record); 11538 // Even if a definition wasn't required before, it may be required now. 11539 if (Pos != VTablesUsed.end()) { 11540 if (!Pos->second && VTables[I].DefinitionRequired) 11541 Pos->second = true; 11542 continue; 11543 } 11544 11545 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 11546 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 11547 } 11548 11549 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 11550} 11551 11552void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 11553 bool DefinitionRequired) { 11554 // Ignore any vtable uses in unevaluated operands or for classes that do 11555 // not have a vtable. 11556 if (!Class->isDynamicClass() || Class->isDependentContext() || 11557 CurContext->isDependentContext() || 11558 ExprEvalContexts.back().Context == Unevaluated) 11559 return; 11560 11561 // Try to insert this class into the map. 11562 LoadExternalVTableUses(); 11563 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 11564 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 11565 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 11566 if (!Pos.second) { 11567 // If we already had an entry, check to see if we are promoting this vtable 11568 // to required a definition. If so, we need to reappend to the VTableUses 11569 // list, since we may have already processed the first entry. 11570 if (DefinitionRequired && !Pos.first->second) { 11571 Pos.first->second = true; 11572 } else { 11573 // Otherwise, we can early exit. 11574 return; 11575 } 11576 } 11577 11578 // Local classes need to have their virtual members marked 11579 // immediately. For all other classes, we mark their virtual members 11580 // at the end of the translation unit. 11581 if (Class->isLocalClass()) 11582 MarkVirtualMembersReferenced(Loc, Class); 11583 else 11584 VTableUses.push_back(std::make_pair(Class, Loc)); 11585} 11586 11587bool Sema::DefineUsedVTables() { 11588 LoadExternalVTableUses(); 11589 if (VTableUses.empty()) 11590 return false; 11591 11592 // Note: The VTableUses vector could grow as a result of marking 11593 // the members of a class as "used", so we check the size each 11594 // time through the loop and prefer indices (which are stable) to 11595 // iterators (which are not). 11596 bool DefinedAnything = false; 11597 for (unsigned I = 0; I != VTableUses.size(); ++I) { 11598 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 11599 if (!Class) 11600 continue; 11601 11602 SourceLocation Loc = VTableUses[I].second; 11603 11604 bool DefineVTable = true; 11605 11606 // If this class has a key function, but that key function is 11607 // defined in another translation unit, we don't need to emit the 11608 // vtable even though we're using it. 11609 const CXXMethodDecl *KeyFunction = Context.getCurrentKeyFunction(Class); 11610 if (KeyFunction && !KeyFunction->hasBody()) { 11611 switch (KeyFunction->getTemplateSpecializationKind()) { 11612 case TSK_Undeclared: 11613 case TSK_ExplicitSpecialization: 11614 case TSK_ExplicitInstantiationDeclaration: 11615 // The key function is in another translation unit. 11616 DefineVTable = false; 11617 break; 11618 11619 case TSK_ExplicitInstantiationDefinition: 11620 case TSK_ImplicitInstantiation: 11621 // We will be instantiating the key function. 11622 break; 11623 } 11624 } else if (!KeyFunction) { 11625 // If we have a class with no key function that is the subject 11626 // of an explicit instantiation declaration, suppress the 11627 // vtable; it will live with the explicit instantiation 11628 // definition. 11629 bool IsExplicitInstantiationDeclaration 11630 = Class->getTemplateSpecializationKind() 11631 == TSK_ExplicitInstantiationDeclaration; 11632 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 11633 REnd = Class->redecls_end(); 11634 R != REnd; ++R) { 11635 TemplateSpecializationKind TSK 11636 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 11637 if (TSK == TSK_ExplicitInstantiationDeclaration) 11638 IsExplicitInstantiationDeclaration = true; 11639 else if (TSK == TSK_ExplicitInstantiationDefinition) { 11640 IsExplicitInstantiationDeclaration = false; 11641 break; 11642 } 11643 } 11644 11645 if (IsExplicitInstantiationDeclaration) 11646 DefineVTable = false; 11647 } 11648 11649 // The exception specifications for all virtual members may be needed even 11650 // if we are not providing an authoritative form of the vtable in this TU. 11651 // We may choose to emit it available_externally anyway. 11652 if (!DefineVTable) { 11653 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 11654 continue; 11655 } 11656 11657 // Mark all of the virtual members of this class as referenced, so 11658 // that we can build a vtable. Then, tell the AST consumer that a 11659 // vtable for this class is required. 11660 DefinedAnything = true; 11661 MarkVirtualMembersReferenced(Loc, Class); 11662 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 11663 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 11664 11665 // Optionally warn if we're emitting a weak vtable. 11666 if (Class->hasExternalLinkage() && 11667 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 11668 const FunctionDecl *KeyFunctionDef = 0; 11669 if (!KeyFunction || 11670 (KeyFunction->hasBody(KeyFunctionDef) && 11671 KeyFunctionDef->isInlined())) 11672 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 11673 TSK_ExplicitInstantiationDefinition 11674 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 11675 << Class; 11676 } 11677 } 11678 VTableUses.clear(); 11679 11680 return DefinedAnything; 11681} 11682 11683void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 11684 const CXXRecordDecl *RD) { 11685 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 11686 E = RD->method_end(); I != E; ++I) 11687 if ((*I)->isVirtual() && !(*I)->isPure()) 11688 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 11689} 11690 11691void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 11692 const CXXRecordDecl *RD) { 11693 // Mark all functions which will appear in RD's vtable as used. 11694 CXXFinalOverriderMap FinalOverriders; 11695 RD->getFinalOverriders(FinalOverriders); 11696 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 11697 E = FinalOverriders.end(); 11698 I != E; ++I) { 11699 for (OverridingMethods::const_iterator OI = I->second.begin(), 11700 OE = I->second.end(); 11701 OI != OE; ++OI) { 11702 assert(OI->second.size() > 0 && "no final overrider"); 11703 CXXMethodDecl *Overrider = OI->second.front().Method; 11704 11705 // C++ [basic.def.odr]p2: 11706 // [...] A virtual member function is used if it is not pure. [...] 11707 if (!Overrider->isPure()) 11708 MarkFunctionReferenced(Loc, Overrider); 11709 } 11710 } 11711 11712 // Only classes that have virtual bases need a VTT. 11713 if (RD->getNumVBases() == 0) 11714 return; 11715 11716 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 11717 e = RD->bases_end(); i != e; ++i) { 11718 const CXXRecordDecl *Base = 11719 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 11720 if (Base->getNumVBases() == 0) 11721 continue; 11722 MarkVirtualMembersReferenced(Loc, Base); 11723 } 11724} 11725 11726/// SetIvarInitializers - This routine builds initialization ASTs for the 11727/// Objective-C implementation whose ivars need be initialized. 11728void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 11729 if (!getLangOpts().CPlusPlus) 11730 return; 11731 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 11732 SmallVector<ObjCIvarDecl*, 8> ivars; 11733 CollectIvarsToConstructOrDestruct(OID, ivars); 11734 if (ivars.empty()) 11735 return; 11736 SmallVector<CXXCtorInitializer*, 32> AllToInit; 11737 for (unsigned i = 0; i < ivars.size(); i++) { 11738 FieldDecl *Field = ivars[i]; 11739 if (Field->isInvalidDecl()) 11740 continue; 11741 11742 CXXCtorInitializer *Member; 11743 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 11744 InitializationKind InitKind = 11745 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 11746 11747 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 11748 ExprResult MemberInit = 11749 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 11750 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 11751 // Note, MemberInit could actually come back empty if no initialization 11752 // is required (e.g., because it would call a trivial default constructor) 11753 if (!MemberInit.get() || MemberInit.isInvalid()) 11754 continue; 11755 11756 Member = 11757 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 11758 SourceLocation(), 11759 MemberInit.takeAs<Expr>(), 11760 SourceLocation()); 11761 AllToInit.push_back(Member); 11762 11763 // Be sure that the destructor is accessible and is marked as referenced. 11764 if (const RecordType *RecordTy 11765 = Context.getBaseElementType(Field->getType()) 11766 ->getAs<RecordType>()) { 11767 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 11768 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 11769 MarkFunctionReferenced(Field->getLocation(), Destructor); 11770 CheckDestructorAccess(Field->getLocation(), Destructor, 11771 PDiag(diag::err_access_dtor_ivar) 11772 << Context.getBaseElementType(Field->getType())); 11773 } 11774 } 11775 } 11776 ObjCImplementation->setIvarInitializers(Context, 11777 AllToInit.data(), AllToInit.size()); 11778 } 11779} 11780 11781static 11782void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 11783 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 11784 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 11785 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 11786 Sema &S) { 11787 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11788 CE = Current.end(); 11789 if (Ctor->isInvalidDecl()) 11790 return; 11791 11792 CXXConstructorDecl *Target = Ctor->getTargetConstructor(); 11793 11794 // Target may not be determinable yet, for instance if this is a dependent 11795 // call in an uninstantiated template. 11796 if (Target) { 11797 const FunctionDecl *FNTarget = 0; 11798 (void)Target->hasBody(FNTarget); 11799 Target = const_cast<CXXConstructorDecl*>( 11800 cast_or_null<CXXConstructorDecl>(FNTarget)); 11801 } 11802 11803 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 11804 // Avoid dereferencing a null pointer here. 11805 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 11806 11807 if (!Current.insert(Canonical)) 11808 return; 11809 11810 // We know that beyond here, we aren't chaining into a cycle. 11811 if (!Target || !Target->isDelegatingConstructor() || 11812 Target->isInvalidDecl() || Valid.count(TCanonical)) { 11813 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11814 Valid.insert(*CI); 11815 Current.clear(); 11816 // We've hit a cycle. 11817 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 11818 Current.count(TCanonical)) { 11819 // If we haven't diagnosed this cycle yet, do so now. 11820 if (!Invalid.count(TCanonical)) { 11821 S.Diag((*Ctor->init_begin())->getSourceLocation(), 11822 diag::warn_delegating_ctor_cycle) 11823 << Ctor; 11824 11825 // Don't add a note for a function delegating directly to itself. 11826 if (TCanonical != Canonical) 11827 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11828 11829 CXXConstructorDecl *C = Target; 11830 while (C->getCanonicalDecl() != Canonical) { 11831 const FunctionDecl *FNTarget = 0; 11832 (void)C->getTargetConstructor()->hasBody(FNTarget); 11833 assert(FNTarget && "Ctor cycle through bodiless function"); 11834 11835 C = const_cast<CXXConstructorDecl*>( 11836 cast<CXXConstructorDecl>(FNTarget)); 11837 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11838 } 11839 } 11840 11841 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11842 Invalid.insert(*CI); 11843 Current.clear(); 11844 } else { 11845 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11846 } 11847} 11848 11849 11850void Sema::CheckDelegatingCtorCycles() { 11851 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11852 11853 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11854 CE = Current.end(); 11855 11856 for (DelegatingCtorDeclsType::iterator 11857 I = DelegatingCtorDecls.begin(ExternalSource), 11858 E = DelegatingCtorDecls.end(); 11859 I != E; ++I) 11860 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11861 11862 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11863 (*CI)->setInvalidDecl(); 11864} 11865 11866namespace { 11867 /// \brief AST visitor that finds references to the 'this' expression. 11868 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 11869 Sema &S; 11870 11871 public: 11872 explicit FindCXXThisExpr(Sema &S) : S(S) { } 11873 11874 bool VisitCXXThisExpr(CXXThisExpr *E) { 11875 S.Diag(E->getLocation(), diag::err_this_static_member_func) 11876 << E->isImplicit(); 11877 return false; 11878 } 11879 }; 11880} 11881 11882bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 11883 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11884 if (!TSInfo) 11885 return false; 11886 11887 TypeLoc TL = TSInfo->getTypeLoc(); 11888 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); 11889 if (!ProtoTL) 11890 return false; 11891 11892 // C++11 [expr.prim.general]p3: 11893 // [The expression this] shall not appear before the optional 11894 // cv-qualifier-seq and it shall not appear within the declaration of a 11895 // static member function (although its type and value category are defined 11896 // within a static member function as they are within a non-static member 11897 // function). [ Note: this is because declaration matching does not occur 11898 // until the complete declarator is known. - end note ] 11899 const FunctionProtoType *Proto = ProtoTL.getTypePtr(); 11900 FindCXXThisExpr Finder(*this); 11901 11902 // If the return type came after the cv-qualifier-seq, check it now. 11903 if (Proto->hasTrailingReturn() && 11904 !Finder.TraverseTypeLoc(ProtoTL.getResultLoc())) 11905 return true; 11906 11907 // Check the exception specification. 11908 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 11909 return true; 11910 11911 return checkThisInStaticMemberFunctionAttributes(Method); 11912} 11913 11914bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 11915 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11916 if (!TSInfo) 11917 return false; 11918 11919 TypeLoc TL = TSInfo->getTypeLoc(); 11920 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); 11921 if (!ProtoTL) 11922 return false; 11923 11924 const FunctionProtoType *Proto = ProtoTL.getTypePtr(); 11925 FindCXXThisExpr Finder(*this); 11926 11927 switch (Proto->getExceptionSpecType()) { 11928 case EST_Uninstantiated: 11929 case EST_Unevaluated: 11930 case EST_BasicNoexcept: 11931 case EST_DynamicNone: 11932 case EST_MSAny: 11933 case EST_None: 11934 break; 11935 11936 case EST_ComputedNoexcept: 11937 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11938 return true; 11939 11940 case EST_Dynamic: 11941 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11942 EEnd = Proto->exception_end(); 11943 E != EEnd; ++E) { 11944 if (!Finder.TraverseType(*E)) 11945 return true; 11946 } 11947 break; 11948 } 11949 11950 return false; 11951} 11952 11953bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11954 FindCXXThisExpr Finder(*this); 11955 11956 // Check attributes. 11957 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11958 A != AEnd; ++A) { 11959 // FIXME: This should be emitted by tblgen. 11960 Expr *Arg = 0; 11961 ArrayRef<Expr *> Args; 11962 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11963 Arg = G->getArg(); 11964 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11965 Arg = G->getArg(); 11966 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11967 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11968 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11969 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11970 else if (ExclusiveLockFunctionAttr *ELF 11971 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11972 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11973 else if (SharedLockFunctionAttr *SLF 11974 = dyn_cast<SharedLockFunctionAttr>(*A)) 11975 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11976 else if (ExclusiveTrylockFunctionAttr *ETLF 11977 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11978 Arg = ETLF->getSuccessValue(); 11979 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11980 } else if (SharedTrylockFunctionAttr *STLF 11981 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11982 Arg = STLF->getSuccessValue(); 11983 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11984 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11985 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11986 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11987 Arg = LR->getArg(); 11988 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11989 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11990 else if (ExclusiveLocksRequiredAttr *ELR 11991 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11992 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11993 else if (SharedLocksRequiredAttr *SLR 11994 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11995 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11996 11997 if (Arg && !Finder.TraverseStmt(Arg)) 11998 return true; 11999 12000 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 12001 if (!Finder.TraverseStmt(Args[I])) 12002 return true; 12003 } 12004 } 12005 12006 return false; 12007} 12008 12009void 12010Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 12011 ArrayRef<ParsedType> DynamicExceptions, 12012 ArrayRef<SourceRange> DynamicExceptionRanges, 12013 Expr *NoexceptExpr, 12014 SmallVectorImpl<QualType> &Exceptions, 12015 FunctionProtoType::ExtProtoInfo &EPI) { 12016 Exceptions.clear(); 12017 EPI.ExceptionSpecType = EST; 12018 if (EST == EST_Dynamic) { 12019 Exceptions.reserve(DynamicExceptions.size()); 12020 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 12021 // FIXME: Preserve type source info. 12022 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 12023 12024 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 12025 collectUnexpandedParameterPacks(ET, Unexpanded); 12026 if (!Unexpanded.empty()) { 12027 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 12028 UPPC_ExceptionType, 12029 Unexpanded); 12030 continue; 12031 } 12032 12033 // Check that the type is valid for an exception spec, and 12034 // drop it if not. 12035 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 12036 Exceptions.push_back(ET); 12037 } 12038 EPI.NumExceptions = Exceptions.size(); 12039 EPI.Exceptions = Exceptions.data(); 12040 return; 12041 } 12042 12043 if (EST == EST_ComputedNoexcept) { 12044 // If an error occurred, there's no expression here. 12045 if (NoexceptExpr) { 12046 assert((NoexceptExpr->isTypeDependent() || 12047 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 12048 Context.BoolTy) && 12049 "Parser should have made sure that the expression is boolean"); 12050 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 12051 EPI.ExceptionSpecType = EST_BasicNoexcept; 12052 return; 12053 } 12054 12055 if (!NoexceptExpr->isValueDependent()) 12056 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 12057 diag::err_noexcept_needs_constant_expression, 12058 /*AllowFold*/ false).take(); 12059 EPI.NoexceptExpr = NoexceptExpr; 12060 } 12061 return; 12062 } 12063} 12064 12065/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 12066Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 12067 // Implicitly declared functions (e.g. copy constructors) are 12068 // __host__ __device__ 12069 if (D->isImplicit()) 12070 return CFT_HostDevice; 12071 12072 if (D->hasAttr<CUDAGlobalAttr>()) 12073 return CFT_Global; 12074 12075 if (D->hasAttr<CUDADeviceAttr>()) { 12076 if (D->hasAttr<CUDAHostAttr>()) 12077 return CFT_HostDevice; 12078 else 12079 return CFT_Device; 12080 } 12081 12082 return CFT_Host; 12083} 12084 12085bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 12086 CUDAFunctionTarget CalleeTarget) { 12087 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 12088 // Callable from the device only." 12089 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 12090 return true; 12091 12092 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 12093 // Callable from the host only." 12094 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 12095 // Callable from the host only." 12096 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 12097 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 12098 return true; 12099 12100 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 12101 return true; 12102 12103 return false; 12104} 12105