SemaDeclCXX.cpp revision 1c030e9a3f290a1eea5de82fe1e63dfde2bd8f1e
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 }; 69 70 /// VisitExpr - Visit all of the children of this expression. 71 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 72 bool IsInvalid = false; 73 for (Stmt::child_range I = Node->children(); I; ++I) 74 IsInvalid |= Visit(*I); 75 return IsInvalid; 76 } 77 78 /// VisitDeclRefExpr - Visit a reference to a declaration, to 79 /// determine whether this declaration can be used in the default 80 /// argument expression. 81 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 82 NamedDecl *Decl = DRE->getDecl(); 83 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 84 // C++ [dcl.fct.default]p9 85 // Default arguments are evaluated each time the function is 86 // called. The order of evaluation of function arguments is 87 // unspecified. Consequently, parameters of a function shall not 88 // be used in default argument expressions, even if they are not 89 // evaluated. Parameters of a function declared before a default 90 // argument expression are in scope and can hide namespace and 91 // class member names. 92 return S->Diag(DRE->getLocStart(), 93 diag::err_param_default_argument_references_param) 94 << Param->getDeclName() << DefaultArg->getSourceRange(); 95 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 96 // C++ [dcl.fct.default]p7 97 // Local variables shall not be used in default argument 98 // expressions. 99 if (VDecl->isLocalVarDecl()) 100 return S->Diag(DRE->getLocStart(), 101 diag::err_param_default_argument_references_local) 102 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 103 } 104 105 return false; 106 } 107 108 /// VisitCXXThisExpr - Visit a C++ "this" expression. 109 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 110 // C++ [dcl.fct.default]p8: 111 // The keyword this shall not be used in a default argument of a 112 // member function. 113 return S->Diag(ThisE->getLocStart(), 114 diag::err_param_default_argument_references_this) 115 << ThisE->getSourceRange(); 116 } 117 118 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 119 // C++11 [expr.lambda.prim]p13: 120 // A lambda-expression appearing in a default argument shall not 121 // implicitly or explicitly capture any entity. 122 if (Lambda->capture_begin() == Lambda->capture_end()) 123 return false; 124 125 return S->Diag(Lambda->getLocStart(), 126 diag::err_lambda_capture_default_arg); 127 } 128} 129 130void Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, 131 CXXMethodDecl *Method) { 132 // If we have an MSAny spec already, don't bother. 133 if (!Method || ComputedEST == EST_MSAny) 134 return; 135 136 const FunctionProtoType *Proto 137 = Method->getType()->getAs<FunctionProtoType>(); 138 Proto = Self->ResolveExceptionSpec(CallLoc, Proto); 139 if (!Proto) 140 return; 141 142 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 143 144 // If this function can throw any exceptions, make a note of that. 145 if (EST == EST_MSAny || EST == EST_None) { 146 ClearExceptions(); 147 ComputedEST = EST; 148 return; 149 } 150 151 // FIXME: If the call to this decl is using any of its default arguments, we 152 // need to search them for potentially-throwing calls. 153 154 // If this function has a basic noexcept, it doesn't affect the outcome. 155 if (EST == EST_BasicNoexcept) 156 return; 157 158 // If we have a throw-all spec at this point, ignore the function. 159 if (ComputedEST == EST_None) 160 return; 161 162 // If we're still at noexcept(true) and there's a nothrow() callee, 163 // change to that specification. 164 if (EST == EST_DynamicNone) { 165 if (ComputedEST == EST_BasicNoexcept) 166 ComputedEST = EST_DynamicNone; 167 return; 168 } 169 170 // Check out noexcept specs. 171 if (EST == EST_ComputedNoexcept) { 172 FunctionProtoType::NoexceptResult NR = 173 Proto->getNoexceptSpec(Self->Context); 174 assert(NR != FunctionProtoType::NR_NoNoexcept && 175 "Must have noexcept result for EST_ComputedNoexcept."); 176 assert(NR != FunctionProtoType::NR_Dependent && 177 "Should not generate implicit declarations for dependent cases, " 178 "and don't know how to handle them anyway."); 179 180 // noexcept(false) -> no spec on the new function 181 if (NR == FunctionProtoType::NR_Throw) { 182 ClearExceptions(); 183 ComputedEST = EST_None; 184 } 185 // noexcept(true) won't change anything either. 186 return; 187 } 188 189 assert(EST == EST_Dynamic && "EST case not considered earlier."); 190 assert(ComputedEST != EST_None && 191 "Shouldn't collect exceptions when throw-all is guaranteed."); 192 ComputedEST = EST_Dynamic; 193 // Record the exceptions in this function's exception specification. 194 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 195 EEnd = Proto->exception_end(); 196 E != EEnd; ++E) 197 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E))) 198 Exceptions.push_back(*E); 199} 200 201void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 202 if (!E || ComputedEST == EST_MSAny) 203 return; 204 205 // FIXME: 206 // 207 // C++0x [except.spec]p14: 208 // [An] implicit exception-specification specifies the type-id T if and 209 // only if T is allowed by the exception-specification of a function directly 210 // invoked by f's implicit definition; f shall allow all exceptions if any 211 // function it directly invokes allows all exceptions, and f shall allow no 212 // exceptions if every function it directly invokes allows no exceptions. 213 // 214 // Note in particular that if an implicit exception-specification is generated 215 // for a function containing a throw-expression, that specification can still 216 // be noexcept(true). 217 // 218 // Note also that 'directly invoked' is not defined in the standard, and there 219 // is no indication that we should only consider potentially-evaluated calls. 220 // 221 // Ultimately we should implement the intent of the standard: the exception 222 // specification should be the set of exceptions which can be thrown by the 223 // implicit definition. For now, we assume that any non-nothrow expression can 224 // throw any exception. 225 226 if (Self->canThrow(E)) 227 ComputedEST = EST_None; 228} 229 230bool 231Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 232 SourceLocation EqualLoc) { 233 if (RequireCompleteType(Param->getLocation(), Param->getType(), 234 diag::err_typecheck_decl_incomplete_type)) { 235 Param->setInvalidDecl(); 236 return true; 237 } 238 239 // C++ [dcl.fct.default]p5 240 // A default argument expression is implicitly converted (clause 241 // 4) to the parameter type. The default argument expression has 242 // the same semantic constraints as the initializer expression in 243 // a declaration of a variable of the parameter type, using the 244 // copy-initialization semantics (8.5). 245 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 246 Param); 247 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 248 EqualLoc); 249 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 250 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg); 251 if (Result.isInvalid()) 252 return true; 253 Arg = Result.takeAs<Expr>(); 254 255 CheckImplicitConversions(Arg, EqualLoc); 256 Arg = MaybeCreateExprWithCleanups(Arg); 257 258 // Okay: add the default argument to the parameter 259 Param->setDefaultArg(Arg); 260 261 // We have already instantiated this parameter; provide each of the 262 // instantiations with the uninstantiated default argument. 263 UnparsedDefaultArgInstantiationsMap::iterator InstPos 264 = UnparsedDefaultArgInstantiations.find(Param); 265 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 266 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 267 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 268 269 // We're done tracking this parameter's instantiations. 270 UnparsedDefaultArgInstantiations.erase(InstPos); 271 } 272 273 return false; 274} 275 276/// ActOnParamDefaultArgument - Check whether the default argument 277/// provided for a function parameter is well-formed. If so, attach it 278/// to the parameter declaration. 279void 280Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 281 Expr *DefaultArg) { 282 if (!param || !DefaultArg) 283 return; 284 285 ParmVarDecl *Param = cast<ParmVarDecl>(param); 286 UnparsedDefaultArgLocs.erase(Param); 287 288 // Default arguments are only permitted in C++ 289 if (!getLangOpts().CPlusPlus) { 290 Diag(EqualLoc, diag::err_param_default_argument) 291 << DefaultArg->getSourceRange(); 292 Param->setInvalidDecl(); 293 return; 294 } 295 296 // Check for unexpanded parameter packs. 297 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 298 Param->setInvalidDecl(); 299 return; 300 } 301 302 // Check that the default argument is well-formed 303 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 304 if (DefaultArgChecker.Visit(DefaultArg)) { 305 Param->setInvalidDecl(); 306 return; 307 } 308 309 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 310} 311 312/// ActOnParamUnparsedDefaultArgument - We've seen a default 313/// argument for a function parameter, but we can't parse it yet 314/// because we're inside a class definition. Note that this default 315/// argument will be parsed later. 316void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 317 SourceLocation EqualLoc, 318 SourceLocation ArgLoc) { 319 if (!param) 320 return; 321 322 ParmVarDecl *Param = cast<ParmVarDecl>(param); 323 if (Param) 324 Param->setUnparsedDefaultArg(); 325 326 UnparsedDefaultArgLocs[Param] = ArgLoc; 327} 328 329/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 330/// the default argument for the parameter param failed. 331void Sema::ActOnParamDefaultArgumentError(Decl *param) { 332 if (!param) 333 return; 334 335 ParmVarDecl *Param = cast<ParmVarDecl>(param); 336 337 Param->setInvalidDecl(); 338 339 UnparsedDefaultArgLocs.erase(Param); 340} 341 342/// CheckExtraCXXDefaultArguments - Check for any extra default 343/// arguments in the declarator, which is not a function declaration 344/// or definition and therefore is not permitted to have default 345/// arguments. This routine should be invoked for every declarator 346/// that is not a function declaration or definition. 347void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 348 // C++ [dcl.fct.default]p3 349 // A default argument expression shall be specified only in the 350 // parameter-declaration-clause of a function declaration or in a 351 // template-parameter (14.1). It shall not be specified for a 352 // parameter pack. If it is specified in a 353 // parameter-declaration-clause, it shall not occur within a 354 // declarator or abstract-declarator of a parameter-declaration. 355 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 356 DeclaratorChunk &chunk = D.getTypeObject(i); 357 if (chunk.Kind == DeclaratorChunk::Function) { 358 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 359 ParmVarDecl *Param = 360 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 361 if (Param->hasUnparsedDefaultArg()) { 362 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 363 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 364 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 365 delete Toks; 366 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 367 } else if (Param->getDefaultArg()) { 368 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 369 << Param->getDefaultArg()->getSourceRange(); 370 Param->setDefaultArg(0); 371 } 372 } 373 } 374 } 375} 376 377/// MergeCXXFunctionDecl - Merge two declarations of the same C++ 378/// function, once we already know that they have the same 379/// type. Subroutine of MergeFunctionDecl. Returns true if there was an 380/// error, false otherwise. 381bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, 382 Scope *S) { 383 bool Invalid = false; 384 385 // C++ [dcl.fct.default]p4: 386 // For non-template functions, default arguments can be added in 387 // later declarations of a function in the same 388 // scope. Declarations in different scopes have completely 389 // distinct sets of default arguments. That is, declarations in 390 // inner scopes do not acquire default arguments from 391 // declarations in outer scopes, and vice versa. In a given 392 // function declaration, all parameters subsequent to a 393 // parameter with a default argument shall have default 394 // arguments supplied in this or previous declarations. A 395 // default argument shall not be redefined by a later 396 // declaration (not even to the same value). 397 // 398 // C++ [dcl.fct.default]p6: 399 // Except for member functions of class templates, the default arguments 400 // in a member function definition that appears outside of the class 401 // definition are added to the set of default arguments provided by the 402 // member function declaration in the class definition. 403 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 404 ParmVarDecl *OldParam = Old->getParamDecl(p); 405 ParmVarDecl *NewParam = New->getParamDecl(p); 406 407 bool OldParamHasDfl = OldParam->hasDefaultArg(); 408 bool NewParamHasDfl = NewParam->hasDefaultArg(); 409 410 NamedDecl *ND = Old; 411 if (S && !isDeclInScope(ND, New->getDeclContext(), S)) 412 // Ignore default parameters of old decl if they are not in 413 // the same scope. 414 OldParamHasDfl = false; 415 416 if (OldParamHasDfl && NewParamHasDfl) { 417 418 unsigned DiagDefaultParamID = 419 diag::err_param_default_argument_redefinition; 420 421 // MSVC accepts that default parameters be redefined for member functions 422 // of template class. The new default parameter's value is ignored. 423 Invalid = true; 424 if (getLangOpts().MicrosoftExt) { 425 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 426 if (MD && MD->getParent()->getDescribedClassTemplate()) { 427 // Merge the old default argument into the new parameter. 428 NewParam->setHasInheritedDefaultArg(); 429 if (OldParam->hasUninstantiatedDefaultArg()) 430 NewParam->setUninstantiatedDefaultArg( 431 OldParam->getUninstantiatedDefaultArg()); 432 else 433 NewParam->setDefaultArg(OldParam->getInit()); 434 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 435 Invalid = false; 436 } 437 } 438 439 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 440 // hint here. Alternatively, we could walk the type-source information 441 // for NewParam to find the last source location in the type... but it 442 // isn't worth the effort right now. This is the kind of test case that 443 // is hard to get right: 444 // int f(int); 445 // void g(int (*fp)(int) = f); 446 // void g(int (*fp)(int) = &f); 447 Diag(NewParam->getLocation(), DiagDefaultParamID) 448 << NewParam->getDefaultArgRange(); 449 450 // Look for the function declaration where the default argument was 451 // actually written, which may be a declaration prior to Old. 452 for (FunctionDecl *Older = Old->getPreviousDecl(); 453 Older; Older = Older->getPreviousDecl()) { 454 if (!Older->getParamDecl(p)->hasDefaultArg()) 455 break; 456 457 OldParam = Older->getParamDecl(p); 458 } 459 460 Diag(OldParam->getLocation(), diag::note_previous_definition) 461 << OldParam->getDefaultArgRange(); 462 } else if (OldParamHasDfl) { 463 // Merge the old default argument into the new parameter. 464 // It's important to use getInit() here; getDefaultArg() 465 // strips off any top-level ExprWithCleanups. 466 NewParam->setHasInheritedDefaultArg(); 467 if (OldParam->hasUninstantiatedDefaultArg()) 468 NewParam->setUninstantiatedDefaultArg( 469 OldParam->getUninstantiatedDefaultArg()); 470 else 471 NewParam->setDefaultArg(OldParam->getInit()); 472 } else if (NewParamHasDfl) { 473 if (New->getDescribedFunctionTemplate()) { 474 // Paragraph 4, quoted above, only applies to non-template functions. 475 Diag(NewParam->getLocation(), 476 diag::err_param_default_argument_template_redecl) 477 << NewParam->getDefaultArgRange(); 478 Diag(Old->getLocation(), diag::note_template_prev_declaration) 479 << false; 480 } else if (New->getTemplateSpecializationKind() 481 != TSK_ImplicitInstantiation && 482 New->getTemplateSpecializationKind() != TSK_Undeclared) { 483 // C++ [temp.expr.spec]p21: 484 // Default function arguments shall not be specified in a declaration 485 // or a definition for one of the following explicit specializations: 486 // - the explicit specialization of a function template; 487 // - the explicit specialization of a member function template; 488 // - the explicit specialization of a member function of a class 489 // template where the class template specialization to which the 490 // member function specialization belongs is implicitly 491 // instantiated. 492 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 493 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 494 << New->getDeclName() 495 << NewParam->getDefaultArgRange(); 496 } else if (New->getDeclContext()->isDependentContext()) { 497 // C++ [dcl.fct.default]p6 (DR217): 498 // Default arguments for a member function of a class template shall 499 // be specified on the initial declaration of the member function 500 // within the class template. 501 // 502 // Reading the tea leaves a bit in DR217 and its reference to DR205 503 // leads me to the conclusion that one cannot add default function 504 // arguments for an out-of-line definition of a member function of a 505 // dependent type. 506 int WhichKind = 2; 507 if (CXXRecordDecl *Record 508 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 509 if (Record->getDescribedClassTemplate()) 510 WhichKind = 0; 511 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 512 WhichKind = 1; 513 else 514 WhichKind = 2; 515 } 516 517 Diag(NewParam->getLocation(), 518 diag::err_param_default_argument_member_template_redecl) 519 << WhichKind 520 << NewParam->getDefaultArgRange(); 521 } 522 } 523 } 524 525 // DR1344: If a default argument is added outside a class definition and that 526 // default argument makes the function a special member function, the program 527 // is ill-formed. This can only happen for constructors. 528 if (isa<CXXConstructorDecl>(New) && 529 New->getMinRequiredArguments() < Old->getMinRequiredArguments()) { 530 CXXSpecialMember NewSM = getSpecialMember(cast<CXXMethodDecl>(New)), 531 OldSM = getSpecialMember(cast<CXXMethodDecl>(Old)); 532 if (NewSM != OldSM) { 533 ParmVarDecl *NewParam = New->getParamDecl(New->getMinRequiredArguments()); 534 assert(NewParam->hasDefaultArg()); 535 Diag(NewParam->getLocation(), diag::err_default_arg_makes_ctor_special) 536 << NewParam->getDefaultArgRange() << NewSM; 537 Diag(Old->getLocation(), diag::note_previous_declaration); 538 } 539 } 540 541 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 542 // template has a constexpr specifier then all its declarations shall 543 // contain the constexpr specifier. 544 if (New->isConstexpr() != Old->isConstexpr()) { 545 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 546 << New << New->isConstexpr(); 547 Diag(Old->getLocation(), diag::note_previous_declaration); 548 Invalid = true; 549 } 550 551 if (CheckEquivalentExceptionSpec(Old, New)) 552 Invalid = true; 553 554 return Invalid; 555} 556 557/// \brief Merge the exception specifications of two variable declarations. 558/// 559/// This is called when there's a redeclaration of a VarDecl. The function 560/// checks if the redeclaration might have an exception specification and 561/// validates compatibility and merges the specs if necessary. 562void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 563 // Shortcut if exceptions are disabled. 564 if (!getLangOpts().CXXExceptions) 565 return; 566 567 assert(Context.hasSameType(New->getType(), Old->getType()) && 568 "Should only be called if types are otherwise the same."); 569 570 QualType NewType = New->getType(); 571 QualType OldType = Old->getType(); 572 573 // We're only interested in pointers and references to functions, as well 574 // as pointers to member functions. 575 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 576 NewType = R->getPointeeType(); 577 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 578 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 579 NewType = P->getPointeeType(); 580 OldType = OldType->getAs<PointerType>()->getPointeeType(); 581 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 582 NewType = M->getPointeeType(); 583 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 584 } 585 586 if (!NewType->isFunctionProtoType()) 587 return; 588 589 // There's lots of special cases for functions. For function pointers, system 590 // libraries are hopefully not as broken so that we don't need these 591 // workarounds. 592 if (CheckEquivalentExceptionSpec( 593 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 594 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 595 New->setInvalidDecl(); 596 } 597} 598 599/// CheckCXXDefaultArguments - Verify that the default arguments for a 600/// function declaration are well-formed according to C++ 601/// [dcl.fct.default]. 602void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 603 unsigned NumParams = FD->getNumParams(); 604 unsigned p; 605 606 bool IsLambda = FD->getOverloadedOperator() == OO_Call && 607 isa<CXXMethodDecl>(FD) && 608 cast<CXXMethodDecl>(FD)->getParent()->isLambda(); 609 610 // Find first parameter with a default argument 611 for (p = 0; p < NumParams; ++p) { 612 ParmVarDecl *Param = FD->getParamDecl(p); 613 if (Param->hasDefaultArg()) { 614 // C++11 [expr.prim.lambda]p5: 615 // [...] Default arguments (8.3.6) shall not be specified in the 616 // parameter-declaration-clause of a lambda-declarator. 617 // 618 // FIXME: Core issue 974 strikes this sentence, we only provide an 619 // extension warning. 620 if (IsLambda) 621 Diag(Param->getLocation(), diag::ext_lambda_default_arguments) 622 << Param->getDefaultArgRange(); 623 break; 624 } 625 } 626 627 // C++ [dcl.fct.default]p4: 628 // In a given function declaration, all parameters 629 // subsequent to a parameter with a default argument shall 630 // have default arguments supplied in this or previous 631 // declarations. A default argument shall not be redefined 632 // by a later declaration (not even to the same value). 633 unsigned LastMissingDefaultArg = 0; 634 for (; p < NumParams; ++p) { 635 ParmVarDecl *Param = FD->getParamDecl(p); 636 if (!Param->hasDefaultArg()) { 637 if (Param->isInvalidDecl()) 638 /* We already complained about this parameter. */; 639 else if (Param->getIdentifier()) 640 Diag(Param->getLocation(), 641 diag::err_param_default_argument_missing_name) 642 << Param->getIdentifier(); 643 else 644 Diag(Param->getLocation(), 645 diag::err_param_default_argument_missing); 646 647 LastMissingDefaultArg = p; 648 } 649 } 650 651 if (LastMissingDefaultArg > 0) { 652 // Some default arguments were missing. Clear out all of the 653 // default arguments up to (and including) the last missing 654 // default argument, so that we leave the function parameters 655 // in a semantically valid state. 656 for (p = 0; p <= LastMissingDefaultArg; ++p) { 657 ParmVarDecl *Param = FD->getParamDecl(p); 658 if (Param->hasDefaultArg()) { 659 Param->setDefaultArg(0); 660 } 661 } 662 } 663} 664 665// CheckConstexprParameterTypes - Check whether a function's parameter types 666// are all literal types. If so, return true. If not, produce a suitable 667// diagnostic and return false. 668static bool CheckConstexprParameterTypes(Sema &SemaRef, 669 const FunctionDecl *FD) { 670 unsigned ArgIndex = 0; 671 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 672 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 673 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 674 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 675 SourceLocation ParamLoc = PD->getLocation(); 676 if (!(*i)->isDependentType() && 677 SemaRef.RequireLiteralType(ParamLoc, *i, 678 diag::err_constexpr_non_literal_param, 679 ArgIndex+1, PD->getSourceRange(), 680 isa<CXXConstructorDecl>(FD))) 681 return false; 682 } 683 return true; 684} 685 686/// \brief Get diagnostic %select index for tag kind for 687/// record diagnostic message. 688/// WARNING: Indexes apply to particular diagnostics only! 689/// 690/// \returns diagnostic %select index. 691static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) { 692 switch (Tag) { 693 case TTK_Struct: return 0; 694 case TTK_Interface: return 1; 695 case TTK_Class: return 2; 696 default: llvm_unreachable("Invalid tag kind for record diagnostic!"); 697 } 698} 699 700// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 701// the requirements of a constexpr function definition or a constexpr 702// constructor definition. If so, return true. If not, produce appropriate 703// diagnostics and return false. 704// 705// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 706bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 707 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 708 if (MD && MD->isInstance()) { 709 // C++11 [dcl.constexpr]p4: 710 // The definition of a constexpr constructor shall satisfy the following 711 // constraints: 712 // - the class shall not have any virtual base classes; 713 const CXXRecordDecl *RD = MD->getParent(); 714 if (RD->getNumVBases()) { 715 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 716 << isa<CXXConstructorDecl>(NewFD) 717 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 718 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 719 E = RD->vbases_end(); I != E; ++I) 720 Diag(I->getLocStart(), 721 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 722 return false; 723 } 724 } 725 726 if (!isa<CXXConstructorDecl>(NewFD)) { 727 // C++11 [dcl.constexpr]p3: 728 // The definition of a constexpr function shall satisfy the following 729 // constraints: 730 // - it shall not be virtual; 731 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 732 if (Method && Method->isVirtual()) { 733 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 734 735 // If it's not obvious why this function is virtual, find an overridden 736 // function which uses the 'virtual' keyword. 737 const CXXMethodDecl *WrittenVirtual = Method; 738 while (!WrittenVirtual->isVirtualAsWritten()) 739 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 740 if (WrittenVirtual != Method) 741 Diag(WrittenVirtual->getLocation(), 742 diag::note_overridden_virtual_function); 743 return false; 744 } 745 746 // - its return type shall be a literal type; 747 QualType RT = NewFD->getResultType(); 748 if (!RT->isDependentType() && 749 RequireLiteralType(NewFD->getLocation(), RT, 750 diag::err_constexpr_non_literal_return)) 751 return false; 752 } 753 754 // - each of its parameter types shall be a literal type; 755 if (!CheckConstexprParameterTypes(*this, NewFD)) 756 return false; 757 758 return true; 759} 760 761/// Check the given declaration statement is legal within a constexpr function 762/// body. C++0x [dcl.constexpr]p3,p4. 763/// 764/// \return true if the body is OK, false if we have diagnosed a problem. 765static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 766 DeclStmt *DS) { 767 // C++0x [dcl.constexpr]p3 and p4: 768 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 769 // contain only 770 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 771 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 772 switch ((*DclIt)->getKind()) { 773 case Decl::StaticAssert: 774 case Decl::Using: 775 case Decl::UsingShadow: 776 case Decl::UsingDirective: 777 case Decl::UnresolvedUsingTypename: 778 // - static_assert-declarations 779 // - using-declarations, 780 // - using-directives, 781 continue; 782 783 case Decl::Typedef: 784 case Decl::TypeAlias: { 785 // - typedef declarations and alias-declarations that do not define 786 // classes or enumerations, 787 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 788 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 789 // Don't allow variably-modified types in constexpr functions. 790 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 791 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 792 << TL.getSourceRange() << TL.getType() 793 << isa<CXXConstructorDecl>(Dcl); 794 return false; 795 } 796 continue; 797 } 798 799 case Decl::Enum: 800 case Decl::CXXRecord: 801 // As an extension, we allow the declaration (but not the definition) of 802 // classes and enumerations in all declarations, not just in typedef and 803 // alias declarations. 804 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 805 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 806 << isa<CXXConstructorDecl>(Dcl); 807 return false; 808 } 809 continue; 810 811 case Decl::Var: 812 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 813 << isa<CXXConstructorDecl>(Dcl); 814 return false; 815 816 default: 817 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 818 << isa<CXXConstructorDecl>(Dcl); 819 return false; 820 } 821 } 822 823 return true; 824} 825 826/// Check that the given field is initialized within a constexpr constructor. 827/// 828/// \param Dcl The constexpr constructor being checked. 829/// \param Field The field being checked. This may be a member of an anonymous 830/// struct or union nested within the class being checked. 831/// \param Inits All declarations, including anonymous struct/union members and 832/// indirect members, for which any initialization was provided. 833/// \param Diagnosed Set to true if an error is produced. 834static void CheckConstexprCtorInitializer(Sema &SemaRef, 835 const FunctionDecl *Dcl, 836 FieldDecl *Field, 837 llvm::SmallSet<Decl*, 16> &Inits, 838 bool &Diagnosed) { 839 if (Field->isUnnamedBitfield()) 840 return; 841 842 if (Field->isAnonymousStructOrUnion() && 843 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 844 return; 845 846 if (!Inits.count(Field)) { 847 if (!Diagnosed) { 848 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 849 Diagnosed = true; 850 } 851 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 852 } else if (Field->isAnonymousStructOrUnion()) { 853 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 854 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 855 I != E; ++I) 856 // If an anonymous union contains an anonymous struct of which any member 857 // is initialized, all members must be initialized. 858 if (!RD->isUnion() || Inits.count(*I)) 859 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 860 } 861} 862 863/// Check the body for the given constexpr function declaration only contains 864/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 865/// 866/// \return true if the body is OK, false if we have diagnosed a problem. 867bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 868 if (isa<CXXTryStmt>(Body)) { 869 // C++11 [dcl.constexpr]p3: 870 // The definition of a constexpr function shall satisfy the following 871 // constraints: [...] 872 // - its function-body shall be = delete, = default, or a 873 // compound-statement 874 // 875 // C++11 [dcl.constexpr]p4: 876 // In the definition of a constexpr constructor, [...] 877 // - its function-body shall not be a function-try-block; 878 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 879 << isa<CXXConstructorDecl>(Dcl); 880 return false; 881 } 882 883 // - its function-body shall be [...] a compound-statement that contains only 884 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 885 886 SmallVector<SourceLocation, 4> ReturnStmts; 887 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 888 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 889 switch ((*BodyIt)->getStmtClass()) { 890 case Stmt::NullStmtClass: 891 // - null statements, 892 continue; 893 894 case Stmt::DeclStmtClass: 895 // - static_assert-declarations 896 // - using-declarations, 897 // - using-directives, 898 // - typedef declarations and alias-declarations that do not define 899 // classes or enumerations, 900 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 901 return false; 902 continue; 903 904 case Stmt::ReturnStmtClass: 905 // - and exactly one return statement; 906 if (isa<CXXConstructorDecl>(Dcl)) 907 break; 908 909 ReturnStmts.push_back((*BodyIt)->getLocStart()); 910 continue; 911 912 default: 913 break; 914 } 915 916 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 917 << isa<CXXConstructorDecl>(Dcl); 918 return false; 919 } 920 921 if (const CXXConstructorDecl *Constructor 922 = dyn_cast<CXXConstructorDecl>(Dcl)) { 923 const CXXRecordDecl *RD = Constructor->getParent(); 924 // DR1359: 925 // - every non-variant non-static data member and base class sub-object 926 // shall be initialized; 927 // - if the class is a non-empty union, or for each non-empty anonymous 928 // union member of a non-union class, exactly one non-static data member 929 // shall be initialized; 930 if (RD->isUnion()) { 931 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 932 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 933 return false; 934 } 935 } else if (!Constructor->isDependentContext() && 936 !Constructor->isDelegatingConstructor()) { 937 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 938 939 // Skip detailed checking if we have enough initializers, and we would 940 // allow at most one initializer per member. 941 bool AnyAnonStructUnionMembers = false; 942 unsigned Fields = 0; 943 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 944 E = RD->field_end(); I != E; ++I, ++Fields) { 945 if (I->isAnonymousStructOrUnion()) { 946 AnyAnonStructUnionMembers = true; 947 break; 948 } 949 } 950 if (AnyAnonStructUnionMembers || 951 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 952 // Check initialization of non-static data members. Base classes are 953 // always initialized so do not need to be checked. Dependent bases 954 // might not have initializers in the member initializer list. 955 llvm::SmallSet<Decl*, 16> Inits; 956 for (CXXConstructorDecl::init_const_iterator 957 I = Constructor->init_begin(), E = Constructor->init_end(); 958 I != E; ++I) { 959 if (FieldDecl *FD = (*I)->getMember()) 960 Inits.insert(FD); 961 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 962 Inits.insert(ID->chain_begin(), ID->chain_end()); 963 } 964 965 bool Diagnosed = false; 966 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 967 E = RD->field_end(); I != E; ++I) 968 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 969 if (Diagnosed) 970 return false; 971 } 972 } 973 } else { 974 if (ReturnStmts.empty()) { 975 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 976 return false; 977 } 978 if (ReturnStmts.size() > 1) { 979 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 980 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 981 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 982 return false; 983 } 984 } 985 986 // C++11 [dcl.constexpr]p5: 987 // if no function argument values exist such that the function invocation 988 // substitution would produce a constant expression, the program is 989 // ill-formed; no diagnostic required. 990 // C++11 [dcl.constexpr]p3: 991 // - every constructor call and implicit conversion used in initializing the 992 // return value shall be one of those allowed in a constant expression. 993 // C++11 [dcl.constexpr]p4: 994 // - every constructor involved in initializing non-static data members and 995 // base class sub-objects shall be a constexpr constructor. 996 SmallVector<PartialDiagnosticAt, 8> Diags; 997 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 998 Diag(Dcl->getLocation(), diag::ext_constexpr_function_never_constant_expr) 999 << isa<CXXConstructorDecl>(Dcl); 1000 for (size_t I = 0, N = Diags.size(); I != N; ++I) 1001 Diag(Diags[I].first, Diags[I].second); 1002 // Don't return false here: we allow this for compatibility in 1003 // system headers. 1004 } 1005 1006 return true; 1007} 1008 1009/// isCurrentClassName - Determine whether the identifier II is the 1010/// name of the class type currently being defined. In the case of 1011/// nested classes, this will only return true if II is the name of 1012/// the innermost class. 1013bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 1014 const CXXScopeSpec *SS) { 1015 assert(getLangOpts().CPlusPlus && "No class names in C!"); 1016 1017 CXXRecordDecl *CurDecl; 1018 if (SS && SS->isSet() && !SS->isInvalid()) { 1019 DeclContext *DC = computeDeclContext(*SS, true); 1020 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 1021 } else 1022 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1023 1024 if (CurDecl && CurDecl->getIdentifier()) 1025 return &II == CurDecl->getIdentifier(); 1026 else 1027 return false; 1028} 1029 1030/// \brief Determine whether the given class is a base class of the given 1031/// class, including looking at dependent bases. 1032static bool findCircularInheritance(const CXXRecordDecl *Class, 1033 const CXXRecordDecl *Current) { 1034 SmallVector<const CXXRecordDecl*, 8> Queue; 1035 1036 Class = Class->getCanonicalDecl(); 1037 while (true) { 1038 for (CXXRecordDecl::base_class_const_iterator I = Current->bases_begin(), 1039 E = Current->bases_end(); 1040 I != E; ++I) { 1041 CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); 1042 if (!Base) 1043 continue; 1044 1045 Base = Base->getDefinition(); 1046 if (!Base) 1047 continue; 1048 1049 if (Base->getCanonicalDecl() == Class) 1050 return true; 1051 1052 Queue.push_back(Base); 1053 } 1054 1055 if (Queue.empty()) 1056 return false; 1057 1058 Current = Queue.back(); 1059 Queue.pop_back(); 1060 } 1061 1062 return false; 1063} 1064 1065/// \brief Check the validity of a C++ base class specifier. 1066/// 1067/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1068/// and returns NULL otherwise. 1069CXXBaseSpecifier * 1070Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1071 SourceRange SpecifierRange, 1072 bool Virtual, AccessSpecifier Access, 1073 TypeSourceInfo *TInfo, 1074 SourceLocation EllipsisLoc) { 1075 QualType BaseType = TInfo->getType(); 1076 1077 // C++ [class.union]p1: 1078 // A union shall not have base classes. 1079 if (Class->isUnion()) { 1080 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1081 << SpecifierRange; 1082 return 0; 1083 } 1084 1085 if (EllipsisLoc.isValid() && 1086 !TInfo->getType()->containsUnexpandedParameterPack()) { 1087 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1088 << TInfo->getTypeLoc().getSourceRange(); 1089 EllipsisLoc = SourceLocation(); 1090 } 1091 1092 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1093 1094 if (BaseType->isDependentType()) { 1095 // Make sure that we don't have circular inheritance among our dependent 1096 // bases. For non-dependent bases, the check for completeness below handles 1097 // this. 1098 if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) { 1099 if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() || 1100 ((BaseDecl = BaseDecl->getDefinition()) && 1101 findCircularInheritance(Class, BaseDecl))) { 1102 Diag(BaseLoc, diag::err_circular_inheritance) 1103 << BaseType << Context.getTypeDeclType(Class); 1104 1105 if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl()) 1106 Diag(BaseDecl->getLocation(), diag::note_previous_decl) 1107 << BaseType; 1108 1109 return 0; 1110 } 1111 } 1112 1113 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1114 Class->getTagKind() == TTK_Class, 1115 Access, TInfo, EllipsisLoc); 1116 } 1117 1118 // Base specifiers must be record types. 1119 if (!BaseType->isRecordType()) { 1120 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1121 return 0; 1122 } 1123 1124 // C++ [class.union]p1: 1125 // A union shall not be used as a base class. 1126 if (BaseType->isUnionType()) { 1127 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1128 return 0; 1129 } 1130 1131 // C++ [class.derived]p2: 1132 // The class-name in a base-specifier shall not be an incompletely 1133 // defined class. 1134 if (RequireCompleteType(BaseLoc, BaseType, 1135 diag::err_incomplete_base_class, SpecifierRange)) { 1136 Class->setInvalidDecl(); 1137 return 0; 1138 } 1139 1140 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1141 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1142 assert(BaseDecl && "Record type has no declaration"); 1143 BaseDecl = BaseDecl->getDefinition(); 1144 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1145 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1146 assert(CXXBaseDecl && "Base type is not a C++ type"); 1147 1148 // C++ [class]p3: 1149 // If a class is marked final and it appears as a base-type-specifier in 1150 // base-clause, the program is ill-formed. 1151 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1152 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1153 << CXXBaseDecl->getDeclName(); 1154 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1155 << CXXBaseDecl->getDeclName(); 1156 return 0; 1157 } 1158 1159 if (BaseDecl->isInvalidDecl()) 1160 Class->setInvalidDecl(); 1161 1162 // Create the base specifier. 1163 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1164 Class->getTagKind() == TTK_Class, 1165 Access, TInfo, EllipsisLoc); 1166} 1167 1168/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1169/// one entry in the base class list of a class specifier, for 1170/// example: 1171/// class foo : public bar, virtual private baz { 1172/// 'public bar' and 'virtual private baz' are each base-specifiers. 1173BaseResult 1174Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1175 bool Virtual, AccessSpecifier Access, 1176 ParsedType basetype, SourceLocation BaseLoc, 1177 SourceLocation EllipsisLoc) { 1178 if (!classdecl) 1179 return true; 1180 1181 AdjustDeclIfTemplate(classdecl); 1182 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1183 if (!Class) 1184 return true; 1185 1186 TypeSourceInfo *TInfo = 0; 1187 GetTypeFromParser(basetype, &TInfo); 1188 1189 if (EllipsisLoc.isInvalid() && 1190 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1191 UPPC_BaseType)) 1192 return true; 1193 1194 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1195 Virtual, Access, TInfo, 1196 EllipsisLoc)) 1197 return BaseSpec; 1198 else 1199 Class->setInvalidDecl(); 1200 1201 return true; 1202} 1203 1204/// \brief Performs the actual work of attaching the given base class 1205/// specifiers to a C++ class. 1206bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1207 unsigned NumBases) { 1208 if (NumBases == 0) 1209 return false; 1210 1211 // Used to keep track of which base types we have already seen, so 1212 // that we can properly diagnose redundant direct base types. Note 1213 // that the key is always the unqualified canonical type of the base 1214 // class. 1215 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1216 1217 // Copy non-redundant base specifiers into permanent storage. 1218 unsigned NumGoodBases = 0; 1219 bool Invalid = false; 1220 for (unsigned idx = 0; idx < NumBases; ++idx) { 1221 QualType NewBaseType 1222 = Context.getCanonicalType(Bases[idx]->getType()); 1223 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1224 1225 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1226 if (KnownBase) { 1227 // C++ [class.mi]p3: 1228 // A class shall not be specified as a direct base class of a 1229 // derived class more than once. 1230 Diag(Bases[idx]->getLocStart(), 1231 diag::err_duplicate_base_class) 1232 << KnownBase->getType() 1233 << Bases[idx]->getSourceRange(); 1234 1235 // Delete the duplicate base class specifier; we're going to 1236 // overwrite its pointer later. 1237 Context.Deallocate(Bases[idx]); 1238 1239 Invalid = true; 1240 } else { 1241 // Okay, add this new base class. 1242 KnownBase = Bases[idx]; 1243 Bases[NumGoodBases++] = Bases[idx]; 1244 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) { 1245 const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); 1246 if (Class->isInterface() && 1247 (!RD->isInterface() || 1248 KnownBase->getAccessSpecifier() != AS_public)) { 1249 // The Microsoft extension __interface does not permit bases that 1250 // are not themselves public interfaces. 1251 Diag(KnownBase->getLocStart(), diag::err_invalid_base_in_interface) 1252 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getName() 1253 << RD->getSourceRange(); 1254 Invalid = true; 1255 } 1256 if (RD->hasAttr<WeakAttr>()) 1257 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1258 } 1259 } 1260 } 1261 1262 // Attach the remaining base class specifiers to the derived class. 1263 Class->setBases(Bases, NumGoodBases); 1264 1265 // Delete the remaining (good) base class specifiers, since their 1266 // data has been copied into the CXXRecordDecl. 1267 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1268 Context.Deallocate(Bases[idx]); 1269 1270 return Invalid; 1271} 1272 1273/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1274/// class, after checking whether there are any duplicate base 1275/// classes. 1276void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1277 unsigned NumBases) { 1278 if (!ClassDecl || !Bases || !NumBases) 1279 return; 1280 1281 AdjustDeclIfTemplate(ClassDecl); 1282 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1283 (CXXBaseSpecifier**)(Bases), NumBases); 1284} 1285 1286static CXXRecordDecl *GetClassForType(QualType T) { 1287 if (const RecordType *RT = T->getAs<RecordType>()) 1288 return cast<CXXRecordDecl>(RT->getDecl()); 1289 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1290 return ICT->getDecl(); 1291 else 1292 return 0; 1293} 1294 1295/// \brief Determine whether the type \p Derived is a C++ class that is 1296/// derived from the type \p Base. 1297bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1298 if (!getLangOpts().CPlusPlus) 1299 return false; 1300 1301 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1302 if (!DerivedRD) 1303 return false; 1304 1305 CXXRecordDecl *BaseRD = GetClassForType(Base); 1306 if (!BaseRD) 1307 return false; 1308 1309 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1310 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1311} 1312 1313/// \brief Determine whether the type \p Derived is a C++ class that is 1314/// derived from the type \p Base. 1315bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1316 if (!getLangOpts().CPlusPlus) 1317 return false; 1318 1319 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1320 if (!DerivedRD) 1321 return false; 1322 1323 CXXRecordDecl *BaseRD = GetClassForType(Base); 1324 if (!BaseRD) 1325 return false; 1326 1327 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1328} 1329 1330void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1331 CXXCastPath &BasePathArray) { 1332 assert(BasePathArray.empty() && "Base path array must be empty!"); 1333 assert(Paths.isRecordingPaths() && "Must record paths!"); 1334 1335 const CXXBasePath &Path = Paths.front(); 1336 1337 // We first go backward and check if we have a virtual base. 1338 // FIXME: It would be better if CXXBasePath had the base specifier for 1339 // the nearest virtual base. 1340 unsigned Start = 0; 1341 for (unsigned I = Path.size(); I != 0; --I) { 1342 if (Path[I - 1].Base->isVirtual()) { 1343 Start = I - 1; 1344 break; 1345 } 1346 } 1347 1348 // Now add all bases. 1349 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1350 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1351} 1352 1353/// \brief Determine whether the given base path includes a virtual 1354/// base class. 1355bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1356 for (CXXCastPath::const_iterator B = BasePath.begin(), 1357 BEnd = BasePath.end(); 1358 B != BEnd; ++B) 1359 if ((*B)->isVirtual()) 1360 return true; 1361 1362 return false; 1363} 1364 1365/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1366/// conversion (where Derived and Base are class types) is 1367/// well-formed, meaning that the conversion is unambiguous (and 1368/// that all of the base classes are accessible). Returns true 1369/// and emits a diagnostic if the code is ill-formed, returns false 1370/// otherwise. Loc is the location where this routine should point to 1371/// if there is an error, and Range is the source range to highlight 1372/// if there is an error. 1373bool 1374Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1375 unsigned InaccessibleBaseID, 1376 unsigned AmbigiousBaseConvID, 1377 SourceLocation Loc, SourceRange Range, 1378 DeclarationName Name, 1379 CXXCastPath *BasePath) { 1380 // First, determine whether the path from Derived to Base is 1381 // ambiguous. This is slightly more expensive than checking whether 1382 // the Derived to Base conversion exists, because here we need to 1383 // explore multiple paths to determine if there is an ambiguity. 1384 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1385 /*DetectVirtual=*/false); 1386 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1387 assert(DerivationOkay && 1388 "Can only be used with a derived-to-base conversion"); 1389 (void)DerivationOkay; 1390 1391 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1392 if (InaccessibleBaseID) { 1393 // Check that the base class can be accessed. 1394 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1395 InaccessibleBaseID)) { 1396 case AR_inaccessible: 1397 return true; 1398 case AR_accessible: 1399 case AR_dependent: 1400 case AR_delayed: 1401 break; 1402 } 1403 } 1404 1405 // Build a base path if necessary. 1406 if (BasePath) 1407 BuildBasePathArray(Paths, *BasePath); 1408 return false; 1409 } 1410 1411 // We know that the derived-to-base conversion is ambiguous, and 1412 // we're going to produce a diagnostic. Perform the derived-to-base 1413 // search just one more time to compute all of the possible paths so 1414 // that we can print them out. This is more expensive than any of 1415 // the previous derived-to-base checks we've done, but at this point 1416 // performance isn't as much of an issue. 1417 Paths.clear(); 1418 Paths.setRecordingPaths(true); 1419 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1420 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1421 (void)StillOkay; 1422 1423 // Build up a textual representation of the ambiguous paths, e.g., 1424 // D -> B -> A, that will be used to illustrate the ambiguous 1425 // conversions in the diagnostic. We only print one of the paths 1426 // to each base class subobject. 1427 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1428 1429 Diag(Loc, AmbigiousBaseConvID) 1430 << Derived << Base << PathDisplayStr << Range << Name; 1431 return true; 1432} 1433 1434bool 1435Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1436 SourceLocation Loc, SourceRange Range, 1437 CXXCastPath *BasePath, 1438 bool IgnoreAccess) { 1439 return CheckDerivedToBaseConversion(Derived, Base, 1440 IgnoreAccess ? 0 1441 : diag::err_upcast_to_inaccessible_base, 1442 diag::err_ambiguous_derived_to_base_conv, 1443 Loc, Range, DeclarationName(), 1444 BasePath); 1445} 1446 1447 1448/// @brief Builds a string representing ambiguous paths from a 1449/// specific derived class to different subobjects of the same base 1450/// class. 1451/// 1452/// This function builds a string that can be used in error messages 1453/// to show the different paths that one can take through the 1454/// inheritance hierarchy to go from the derived class to different 1455/// subobjects of a base class. The result looks something like this: 1456/// @code 1457/// struct D -> struct B -> struct A 1458/// struct D -> struct C -> struct A 1459/// @endcode 1460std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1461 std::string PathDisplayStr; 1462 std::set<unsigned> DisplayedPaths; 1463 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1464 Path != Paths.end(); ++Path) { 1465 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1466 // We haven't displayed a path to this particular base 1467 // class subobject yet. 1468 PathDisplayStr += "\n "; 1469 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1470 for (CXXBasePath::const_iterator Element = Path->begin(); 1471 Element != Path->end(); ++Element) 1472 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1473 } 1474 } 1475 1476 return PathDisplayStr; 1477} 1478 1479//===----------------------------------------------------------------------===// 1480// C++ class member Handling 1481//===----------------------------------------------------------------------===// 1482 1483/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1484bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1485 SourceLocation ASLoc, 1486 SourceLocation ColonLoc, 1487 AttributeList *Attrs) { 1488 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1489 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1490 ASLoc, ColonLoc); 1491 CurContext->addHiddenDecl(ASDecl); 1492 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1493} 1494 1495/// CheckOverrideControl - Check C++11 override control semantics. 1496void Sema::CheckOverrideControl(Decl *D) { 1497 if (D->isInvalidDecl()) 1498 return; 1499 1500 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1501 1502 // Do we know which functions this declaration might be overriding? 1503 bool OverridesAreKnown = !MD || 1504 (!MD->getParent()->hasAnyDependentBases() && 1505 !MD->getType()->isDependentType()); 1506 1507 if (!MD || !MD->isVirtual()) { 1508 if (OverridesAreKnown) { 1509 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1510 Diag(OA->getLocation(), 1511 diag::override_keyword_only_allowed_on_virtual_member_functions) 1512 << "override" << FixItHint::CreateRemoval(OA->getLocation()); 1513 D->dropAttr<OverrideAttr>(); 1514 } 1515 if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1516 Diag(FA->getLocation(), 1517 diag::override_keyword_only_allowed_on_virtual_member_functions) 1518 << "final" << FixItHint::CreateRemoval(FA->getLocation()); 1519 D->dropAttr<FinalAttr>(); 1520 } 1521 } 1522 return; 1523 } 1524 1525 if (!OverridesAreKnown) 1526 return; 1527 1528 // C++11 [class.virtual]p5: 1529 // If a virtual function is marked with the virt-specifier override and 1530 // does not override a member function of a base class, the program is 1531 // ill-formed. 1532 bool HasOverriddenMethods = 1533 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1534 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) 1535 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) 1536 << MD->getDeclName(); 1537} 1538 1539/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1540/// function overrides a virtual member function marked 'final', according to 1541/// C++11 [class.virtual]p4. 1542bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1543 const CXXMethodDecl *Old) { 1544 if (!Old->hasAttr<FinalAttr>()) 1545 return false; 1546 1547 Diag(New->getLocation(), diag::err_final_function_overridden) 1548 << New->getDeclName(); 1549 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1550 return true; 1551} 1552 1553static bool InitializationHasSideEffects(const FieldDecl &FD) { 1554 const Type *T = FD.getType()->getBaseElementTypeUnsafe(); 1555 // FIXME: Destruction of ObjC lifetime types has side-effects. 1556 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) 1557 return !RD->isCompleteDefinition() || 1558 !RD->hasTrivialDefaultConstructor() || 1559 !RD->hasTrivialDestructor(); 1560 return false; 1561} 1562 1563/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1564/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1565/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1566/// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1567/// present (but parsing it has been deferred). 1568NamedDecl * 1569Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1570 MultiTemplateParamsArg TemplateParameterLists, 1571 Expr *BW, const VirtSpecifiers &VS, 1572 InClassInitStyle InitStyle) { 1573 const DeclSpec &DS = D.getDeclSpec(); 1574 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1575 DeclarationName Name = NameInfo.getName(); 1576 SourceLocation Loc = NameInfo.getLoc(); 1577 1578 // For anonymous bitfields, the location should point to the type. 1579 if (Loc.isInvalid()) 1580 Loc = D.getLocStart(); 1581 1582 Expr *BitWidth = static_cast<Expr*>(BW); 1583 1584 assert(isa<CXXRecordDecl>(CurContext)); 1585 assert(!DS.isFriendSpecified()); 1586 1587 bool isFunc = D.isDeclarationOfFunction(); 1588 1589 if (cast<CXXRecordDecl>(CurContext)->isInterface()) { 1590 // The Microsoft extension __interface only permits public member functions 1591 // and prohibits constructors, destructors, operators, non-public member 1592 // functions, static methods and data members. 1593 unsigned InvalidDecl; 1594 bool ShowDeclName = true; 1595 if (!isFunc) 1596 InvalidDecl = (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) ? 0 : 1; 1597 else if (AS != AS_public) 1598 InvalidDecl = 2; 1599 else if (DS.getStorageClassSpec() == DeclSpec::SCS_static) 1600 InvalidDecl = 3; 1601 else switch (Name.getNameKind()) { 1602 case DeclarationName::CXXConstructorName: 1603 InvalidDecl = 4; 1604 ShowDeclName = false; 1605 break; 1606 1607 case DeclarationName::CXXDestructorName: 1608 InvalidDecl = 5; 1609 ShowDeclName = false; 1610 break; 1611 1612 case DeclarationName::CXXOperatorName: 1613 case DeclarationName::CXXConversionFunctionName: 1614 InvalidDecl = 6; 1615 break; 1616 1617 default: 1618 InvalidDecl = 0; 1619 break; 1620 } 1621 1622 if (InvalidDecl) { 1623 if (ShowDeclName) 1624 Diag(Loc, diag::err_invalid_member_in_interface) 1625 << (InvalidDecl-1) << Name; 1626 else 1627 Diag(Loc, diag::err_invalid_member_in_interface) 1628 << (InvalidDecl-1) << ""; 1629 return 0; 1630 } 1631 } 1632 1633 // C++ 9.2p6: A member shall not be declared to have automatic storage 1634 // duration (auto, register) or with the extern storage-class-specifier. 1635 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1636 // data members and cannot be applied to names declared const or static, 1637 // and cannot be applied to reference members. 1638 switch (DS.getStorageClassSpec()) { 1639 case DeclSpec::SCS_unspecified: 1640 case DeclSpec::SCS_typedef: 1641 case DeclSpec::SCS_static: 1642 // FALL THROUGH. 1643 break; 1644 case DeclSpec::SCS_mutable: 1645 if (isFunc) { 1646 if (DS.getStorageClassSpecLoc().isValid()) 1647 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1648 else 1649 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1650 1651 // FIXME: It would be nicer if the keyword was ignored only for this 1652 // declarator. Otherwise we could get follow-up errors. 1653 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1654 } 1655 break; 1656 default: 1657 if (DS.getStorageClassSpecLoc().isValid()) 1658 Diag(DS.getStorageClassSpecLoc(), 1659 diag::err_storageclass_invalid_for_member); 1660 else 1661 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1662 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1663 } 1664 1665 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1666 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1667 !isFunc); 1668 1669 NamedDecl *Member; 1670 if (isInstField) { 1671 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1672 1673 // Data members must have identifiers for names. 1674 if (!Name.isIdentifier()) { 1675 Diag(Loc, diag::err_bad_variable_name) 1676 << Name; 1677 return 0; 1678 } 1679 1680 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1681 1682 // Member field could not be with "template" keyword. 1683 // So TemplateParameterLists should be empty in this case. 1684 if (TemplateParameterLists.size()) { 1685 TemplateParameterList* TemplateParams = TemplateParameterLists[0]; 1686 if (TemplateParams->size()) { 1687 // There is no such thing as a member field template. 1688 Diag(D.getIdentifierLoc(), diag::err_template_member) 1689 << II 1690 << SourceRange(TemplateParams->getTemplateLoc(), 1691 TemplateParams->getRAngleLoc()); 1692 } else { 1693 // There is an extraneous 'template<>' for this member. 1694 Diag(TemplateParams->getTemplateLoc(), 1695 diag::err_template_member_noparams) 1696 << II 1697 << SourceRange(TemplateParams->getTemplateLoc(), 1698 TemplateParams->getRAngleLoc()); 1699 } 1700 return 0; 1701 } 1702 1703 if (SS.isSet() && !SS.isInvalid()) { 1704 // The user provided a superfluous scope specifier inside a class 1705 // definition: 1706 // 1707 // class X { 1708 // int X::member; 1709 // }; 1710 if (DeclContext *DC = computeDeclContext(SS, false)) 1711 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1712 else 1713 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1714 << Name << SS.getRange(); 1715 1716 SS.clear(); 1717 } 1718 1719 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1720 InitStyle, AS); 1721 assert(Member && "HandleField never returns null"); 1722 } else { 1723 assert(InitStyle == ICIS_NoInit); 1724 1725 Member = HandleDeclarator(S, D, TemplateParameterLists); 1726 if (!Member) { 1727 return 0; 1728 } 1729 1730 // Non-instance-fields can't have a bitfield. 1731 if (BitWidth) { 1732 if (Member->isInvalidDecl()) { 1733 // don't emit another diagnostic. 1734 } else if (isa<VarDecl>(Member)) { 1735 // C++ 9.6p3: A bit-field shall not be a static member. 1736 // "static member 'A' cannot be a bit-field" 1737 Diag(Loc, diag::err_static_not_bitfield) 1738 << Name << BitWidth->getSourceRange(); 1739 } else if (isa<TypedefDecl>(Member)) { 1740 // "typedef member 'x' cannot be a bit-field" 1741 Diag(Loc, diag::err_typedef_not_bitfield) 1742 << Name << BitWidth->getSourceRange(); 1743 } else { 1744 // A function typedef ("typedef int f(); f a;"). 1745 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1746 Diag(Loc, diag::err_not_integral_type_bitfield) 1747 << Name << cast<ValueDecl>(Member)->getType() 1748 << BitWidth->getSourceRange(); 1749 } 1750 1751 BitWidth = 0; 1752 Member->setInvalidDecl(); 1753 } 1754 1755 Member->setAccess(AS); 1756 1757 // If we have declared a member function template, set the access of the 1758 // templated declaration as well. 1759 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1760 FunTmpl->getTemplatedDecl()->setAccess(AS); 1761 } 1762 1763 if (VS.isOverrideSpecified()) 1764 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1765 if (VS.isFinalSpecified()) 1766 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1767 1768 if (VS.getLastLocation().isValid()) { 1769 // Update the end location of a method that has a virt-specifiers. 1770 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1771 MD->setRangeEnd(VS.getLastLocation()); 1772 } 1773 1774 CheckOverrideControl(Member); 1775 1776 assert((Name || isInstField) && "No identifier for non-field ?"); 1777 1778 if (isInstField) { 1779 FieldDecl *FD = cast<FieldDecl>(Member); 1780 FieldCollector->Add(FD); 1781 1782 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 1783 FD->getLocation()) 1784 != DiagnosticsEngine::Ignored) { 1785 // Remember all explicit private FieldDecls that have a name, no side 1786 // effects and are not part of a dependent type declaration. 1787 if (!FD->isImplicit() && FD->getDeclName() && 1788 FD->getAccess() == AS_private && 1789 !FD->hasAttr<UnusedAttr>() && 1790 !FD->getParent()->isDependentContext() && 1791 !InitializationHasSideEffects(*FD)) 1792 UnusedPrivateFields.insert(FD); 1793 } 1794 } 1795 1796 return Member; 1797} 1798 1799namespace { 1800 class UninitializedFieldVisitor 1801 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 1802 Sema &S; 1803 ValueDecl *VD; 1804 public: 1805 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 1806 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context), 1807 S(S) { 1808 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(VD)) 1809 this->VD = IFD->getAnonField(); 1810 else 1811 this->VD = VD; 1812 } 1813 1814 void HandleExpr(Expr *E) { 1815 if (!E) return; 1816 1817 // Expressions like x(x) sometimes lack the surrounding expressions 1818 // but need to be checked anyways. 1819 HandleValue(E); 1820 Visit(E); 1821 } 1822 1823 void HandleValue(Expr *E) { 1824 E = E->IgnoreParens(); 1825 1826 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 1827 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 1828 return; 1829 1830 // FieldME is the inner-most MemberExpr that is not an anonymous struct 1831 // or union. 1832 MemberExpr *FieldME = ME; 1833 1834 Expr *Base = E; 1835 while (isa<MemberExpr>(Base)) { 1836 ME = cast<MemberExpr>(Base); 1837 1838 if (isa<VarDecl>(ME->getMemberDecl())) 1839 return; 1840 1841 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 1842 if (!FD->isAnonymousStructOrUnion()) 1843 FieldME = ME; 1844 1845 Base = ME->getBase(); 1846 } 1847 1848 if (VD == FieldME->getMemberDecl() && isa<CXXThisExpr>(Base)) { 1849 unsigned diag = VD->getType()->isReferenceType() 1850 ? diag::warn_reference_field_is_uninit 1851 : diag::warn_field_is_uninit; 1852 S.Diag(FieldME->getExprLoc(), diag) << VD; 1853 } 1854 return; 1855 } 1856 1857 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 1858 HandleValue(CO->getTrueExpr()); 1859 HandleValue(CO->getFalseExpr()); 1860 return; 1861 } 1862 1863 if (BinaryConditionalOperator *BCO = 1864 dyn_cast<BinaryConditionalOperator>(E)) { 1865 HandleValue(BCO->getCommon()); 1866 HandleValue(BCO->getFalseExpr()); 1867 return; 1868 } 1869 1870 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 1871 switch (BO->getOpcode()) { 1872 default: 1873 return; 1874 case(BO_PtrMemD): 1875 case(BO_PtrMemI): 1876 HandleValue(BO->getLHS()); 1877 return; 1878 case(BO_Comma): 1879 HandleValue(BO->getRHS()); 1880 return; 1881 } 1882 } 1883 } 1884 1885 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 1886 if (E->getCastKind() == CK_LValueToRValue) 1887 HandleValue(E->getSubExpr()); 1888 1889 Inherited::VisitImplicitCastExpr(E); 1890 } 1891 1892 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 1893 Expr *Callee = E->getCallee(); 1894 if (isa<MemberExpr>(Callee)) 1895 HandleValue(Callee); 1896 1897 Inherited::VisitCXXMemberCallExpr(E); 1898 } 1899 }; 1900 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E, 1901 ValueDecl *VD) { 1902 UninitializedFieldVisitor(S, VD).HandleExpr(E); 1903 } 1904} // namespace 1905 1906/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1907/// in-class initializer for a non-static C++ class member, and after 1908/// instantiating an in-class initializer in a class template. Such actions 1909/// are deferred until the class is complete. 1910void 1911Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 1912 Expr *InitExpr) { 1913 FieldDecl *FD = cast<FieldDecl>(D); 1914 assert(FD->getInClassInitStyle() != ICIS_NoInit && 1915 "must set init style when field is created"); 1916 1917 if (!InitExpr) { 1918 FD->setInvalidDecl(); 1919 FD->removeInClassInitializer(); 1920 return; 1921 } 1922 1923 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1924 FD->setInvalidDecl(); 1925 FD->removeInClassInitializer(); 1926 return; 1927 } 1928 1929 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, InitLoc) 1930 != DiagnosticsEngine::Ignored) { 1931 CheckInitExprContainsUninitializedFields(*this, InitExpr, FD); 1932 } 1933 1934 ExprResult Init = InitExpr; 1935 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1936 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1937 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1938 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1939 } 1940 Expr **Inits = &InitExpr; 1941 unsigned NumInits = 1; 1942 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1943 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 1944 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1945 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 1946 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 1947 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 1948 if (Init.isInvalid()) { 1949 FD->setInvalidDecl(); 1950 return; 1951 } 1952 1953 CheckImplicitConversions(Init.get(), InitLoc); 1954 } 1955 1956 // C++0x [class.base.init]p7: 1957 // The initialization of each base and member constitutes a 1958 // full-expression. 1959 Init = MaybeCreateExprWithCleanups(Init); 1960 if (Init.isInvalid()) { 1961 FD->setInvalidDecl(); 1962 return; 1963 } 1964 1965 InitExpr = Init.release(); 1966 1967 FD->setInClassInitializer(InitExpr); 1968} 1969 1970/// \brief Find the direct and/or virtual base specifiers that 1971/// correspond to the given base type, for use in base initialization 1972/// within a constructor. 1973static bool FindBaseInitializer(Sema &SemaRef, 1974 CXXRecordDecl *ClassDecl, 1975 QualType BaseType, 1976 const CXXBaseSpecifier *&DirectBaseSpec, 1977 const CXXBaseSpecifier *&VirtualBaseSpec) { 1978 // First, check for a direct base class. 1979 DirectBaseSpec = 0; 1980 for (CXXRecordDecl::base_class_const_iterator Base 1981 = ClassDecl->bases_begin(); 1982 Base != ClassDecl->bases_end(); ++Base) { 1983 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1984 // We found a direct base of this type. That's what we're 1985 // initializing. 1986 DirectBaseSpec = &*Base; 1987 break; 1988 } 1989 } 1990 1991 // Check for a virtual base class. 1992 // FIXME: We might be able to short-circuit this if we know in advance that 1993 // there are no virtual bases. 1994 VirtualBaseSpec = 0; 1995 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1996 // We haven't found a base yet; search the class hierarchy for a 1997 // virtual base class. 1998 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1999 /*DetectVirtual=*/false); 2000 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 2001 BaseType, Paths)) { 2002 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 2003 Path != Paths.end(); ++Path) { 2004 if (Path->back().Base->isVirtual()) { 2005 VirtualBaseSpec = Path->back().Base; 2006 break; 2007 } 2008 } 2009 } 2010 } 2011 2012 return DirectBaseSpec || VirtualBaseSpec; 2013} 2014 2015/// \brief Handle a C++ member initializer using braced-init-list syntax. 2016MemInitResult 2017Sema::ActOnMemInitializer(Decl *ConstructorD, 2018 Scope *S, 2019 CXXScopeSpec &SS, 2020 IdentifierInfo *MemberOrBase, 2021 ParsedType TemplateTypeTy, 2022 const DeclSpec &DS, 2023 SourceLocation IdLoc, 2024 Expr *InitList, 2025 SourceLocation EllipsisLoc) { 2026 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2027 DS, IdLoc, InitList, 2028 EllipsisLoc); 2029} 2030 2031/// \brief Handle a C++ member initializer using parentheses syntax. 2032MemInitResult 2033Sema::ActOnMemInitializer(Decl *ConstructorD, 2034 Scope *S, 2035 CXXScopeSpec &SS, 2036 IdentifierInfo *MemberOrBase, 2037 ParsedType TemplateTypeTy, 2038 const DeclSpec &DS, 2039 SourceLocation IdLoc, 2040 SourceLocation LParenLoc, 2041 Expr **Args, unsigned NumArgs, 2042 SourceLocation RParenLoc, 2043 SourceLocation EllipsisLoc) { 2044 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, 2045 llvm::makeArrayRef(Args, NumArgs), 2046 RParenLoc); 2047 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2048 DS, IdLoc, List, EllipsisLoc); 2049} 2050 2051namespace { 2052 2053// Callback to only accept typo corrections that can be a valid C++ member 2054// intializer: either a non-static field member or a base class. 2055class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 2056 public: 2057 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 2058 : ClassDecl(ClassDecl) {} 2059 2060 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 2061 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 2062 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 2063 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 2064 else 2065 return isa<TypeDecl>(ND); 2066 } 2067 return false; 2068 } 2069 2070 private: 2071 CXXRecordDecl *ClassDecl; 2072}; 2073 2074} 2075 2076/// \brief Handle a C++ member initializer. 2077MemInitResult 2078Sema::BuildMemInitializer(Decl *ConstructorD, 2079 Scope *S, 2080 CXXScopeSpec &SS, 2081 IdentifierInfo *MemberOrBase, 2082 ParsedType TemplateTypeTy, 2083 const DeclSpec &DS, 2084 SourceLocation IdLoc, 2085 Expr *Init, 2086 SourceLocation EllipsisLoc) { 2087 if (!ConstructorD) 2088 return true; 2089 2090 AdjustDeclIfTemplate(ConstructorD); 2091 2092 CXXConstructorDecl *Constructor 2093 = dyn_cast<CXXConstructorDecl>(ConstructorD); 2094 if (!Constructor) { 2095 // The user wrote a constructor initializer on a function that is 2096 // not a C++ constructor. Ignore the error for now, because we may 2097 // have more member initializers coming; we'll diagnose it just 2098 // once in ActOnMemInitializers. 2099 return true; 2100 } 2101 2102 CXXRecordDecl *ClassDecl = Constructor->getParent(); 2103 2104 // C++ [class.base.init]p2: 2105 // Names in a mem-initializer-id are looked up in the scope of the 2106 // constructor's class and, if not found in that scope, are looked 2107 // up in the scope containing the constructor's definition. 2108 // [Note: if the constructor's class contains a member with the 2109 // same name as a direct or virtual base class of the class, a 2110 // mem-initializer-id naming the member or base class and composed 2111 // of a single identifier refers to the class member. A 2112 // mem-initializer-id for the hidden base class may be specified 2113 // using a qualified name. ] 2114 if (!SS.getScopeRep() && !TemplateTypeTy) { 2115 // Look for a member, first. 2116 DeclContext::lookup_result Result 2117 = ClassDecl->lookup(MemberOrBase); 2118 if (!Result.empty()) { 2119 ValueDecl *Member; 2120 if ((Member = dyn_cast<FieldDecl>(Result.front())) || 2121 (Member = dyn_cast<IndirectFieldDecl>(Result.front()))) { 2122 if (EllipsisLoc.isValid()) 2123 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 2124 << MemberOrBase 2125 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 2126 2127 return BuildMemberInitializer(Member, Init, IdLoc); 2128 } 2129 } 2130 } 2131 // It didn't name a member, so see if it names a class. 2132 QualType BaseType; 2133 TypeSourceInfo *TInfo = 0; 2134 2135 if (TemplateTypeTy) { 2136 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 2137 } else if (DS.getTypeSpecType() == TST_decltype) { 2138 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 2139 } else { 2140 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 2141 LookupParsedName(R, S, &SS); 2142 2143 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 2144 if (!TyD) { 2145 if (R.isAmbiguous()) return true; 2146 2147 // We don't want access-control diagnostics here. 2148 R.suppressDiagnostics(); 2149 2150 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 2151 bool NotUnknownSpecialization = false; 2152 DeclContext *DC = computeDeclContext(SS, false); 2153 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 2154 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 2155 2156 if (!NotUnknownSpecialization) { 2157 // When the scope specifier can refer to a member of an unknown 2158 // specialization, we take it as a type name. 2159 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 2160 SS.getWithLocInContext(Context), 2161 *MemberOrBase, IdLoc); 2162 if (BaseType.isNull()) 2163 return true; 2164 2165 R.clear(); 2166 R.setLookupName(MemberOrBase); 2167 } 2168 } 2169 2170 // If no results were found, try to correct typos. 2171 TypoCorrection Corr; 2172 MemInitializerValidatorCCC Validator(ClassDecl); 2173 if (R.empty() && BaseType.isNull() && 2174 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 2175 Validator, ClassDecl))) { 2176 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 2177 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 2178 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 2179 // We have found a non-static data member with a similar 2180 // name to what was typed; complain and initialize that 2181 // member. 2182 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2183 << MemberOrBase << true << CorrectedQuotedStr 2184 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2185 Diag(Member->getLocation(), diag::note_previous_decl) 2186 << CorrectedQuotedStr; 2187 2188 return BuildMemberInitializer(Member, Init, IdLoc); 2189 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 2190 const CXXBaseSpecifier *DirectBaseSpec; 2191 const CXXBaseSpecifier *VirtualBaseSpec; 2192 if (FindBaseInitializer(*this, ClassDecl, 2193 Context.getTypeDeclType(Type), 2194 DirectBaseSpec, VirtualBaseSpec)) { 2195 // We have found a direct or virtual base class with a 2196 // similar name to what was typed; complain and initialize 2197 // that base class. 2198 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2199 << MemberOrBase << false << CorrectedQuotedStr 2200 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2201 2202 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 2203 : VirtualBaseSpec; 2204 Diag(BaseSpec->getLocStart(), 2205 diag::note_base_class_specified_here) 2206 << BaseSpec->getType() 2207 << BaseSpec->getSourceRange(); 2208 2209 TyD = Type; 2210 } 2211 } 2212 } 2213 2214 if (!TyD && BaseType.isNull()) { 2215 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 2216 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 2217 return true; 2218 } 2219 } 2220 2221 if (BaseType.isNull()) { 2222 BaseType = Context.getTypeDeclType(TyD); 2223 if (SS.isSet()) { 2224 NestedNameSpecifier *Qualifier = 2225 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2226 2227 // FIXME: preserve source range information 2228 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 2229 } 2230 } 2231 } 2232 2233 if (!TInfo) 2234 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 2235 2236 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 2237} 2238 2239/// Checks a member initializer expression for cases where reference (or 2240/// pointer) members are bound to by-value parameters (or their addresses). 2241static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 2242 Expr *Init, 2243 SourceLocation IdLoc) { 2244 QualType MemberTy = Member->getType(); 2245 2246 // We only handle pointers and references currently. 2247 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 2248 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 2249 return; 2250 2251 const bool IsPointer = MemberTy->isPointerType(); 2252 if (IsPointer) { 2253 if (const UnaryOperator *Op 2254 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2255 // The only case we're worried about with pointers requires taking the 2256 // address. 2257 if (Op->getOpcode() != UO_AddrOf) 2258 return; 2259 2260 Init = Op->getSubExpr(); 2261 } else { 2262 // We only handle address-of expression initializers for pointers. 2263 return; 2264 } 2265 } 2266 2267 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 2268 // Taking the address of a temporary will be diagnosed as a hard error. 2269 if (IsPointer) 2270 return; 2271 2272 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 2273 << Member << Init->getSourceRange(); 2274 } else if (const DeclRefExpr *DRE 2275 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2276 // We only warn when referring to a non-reference parameter declaration. 2277 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2278 if (!Parameter || Parameter->getType()->isReferenceType()) 2279 return; 2280 2281 S.Diag(Init->getExprLoc(), 2282 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2283 : diag::warn_bind_ref_member_to_parameter) 2284 << Member << Parameter << Init->getSourceRange(); 2285 } else { 2286 // Other initializers are fine. 2287 return; 2288 } 2289 2290 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2291 << (unsigned)IsPointer; 2292} 2293 2294MemInitResult 2295Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2296 SourceLocation IdLoc) { 2297 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2298 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2299 assert((DirectMember || IndirectMember) && 2300 "Member must be a FieldDecl or IndirectFieldDecl"); 2301 2302 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2303 return true; 2304 2305 if (Member->isInvalidDecl()) 2306 return true; 2307 2308 // Diagnose value-uses of fields to initialize themselves, e.g. 2309 // foo(foo) 2310 // where foo is not also a parameter to the constructor. 2311 // TODO: implement -Wuninitialized and fold this into that framework. 2312 Expr **Args; 2313 unsigned NumArgs; 2314 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2315 Args = ParenList->getExprs(); 2316 NumArgs = ParenList->getNumExprs(); 2317 } else if (InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) { 2318 Args = InitList->getInits(); 2319 NumArgs = InitList->getNumInits(); 2320 } else { 2321 // Template instantiation doesn't reconstruct ParenListExprs for us. 2322 Args = &Init; 2323 NumArgs = 1; 2324 } 2325 2326 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc) 2327 != DiagnosticsEngine::Ignored) 2328 for (unsigned i = 0; i < NumArgs; ++i) 2329 // FIXME: Warn about the case when other fields are used before being 2330 // initialized. For example, let this field be the i'th field. When 2331 // initializing the i'th field, throw a warning if any of the >= i'th 2332 // fields are used, as they are not yet initialized. 2333 // Right now we are only handling the case where the i'th field uses 2334 // itself in its initializer. 2335 // Also need to take into account that some fields may be initialized by 2336 // in-class initializers, see C++11 [class.base.init]p9. 2337 CheckInitExprContainsUninitializedFields(*this, Args[i], Member); 2338 2339 SourceRange InitRange = Init->getSourceRange(); 2340 2341 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2342 // Can't check initialization for a member of dependent type or when 2343 // any of the arguments are type-dependent expressions. 2344 DiscardCleanupsInEvaluationContext(); 2345 } else { 2346 bool InitList = false; 2347 if (isa<InitListExpr>(Init)) { 2348 InitList = true; 2349 Args = &Init; 2350 NumArgs = 1; 2351 2352 if (isStdInitializerList(Member->getType(), 0)) { 2353 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2354 << /*at end of ctor*/1 << InitRange; 2355 } 2356 } 2357 2358 // Initialize the member. 2359 InitializedEntity MemberEntity = 2360 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2361 : InitializedEntity::InitializeMember(IndirectMember, 0); 2362 InitializationKind Kind = 2363 InitList ? InitializationKind::CreateDirectList(IdLoc) 2364 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2365 InitRange.getEnd()); 2366 2367 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2368 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2369 MultiExprArg(Args, NumArgs), 2370 0); 2371 if (MemberInit.isInvalid()) 2372 return true; 2373 2374 CheckImplicitConversions(MemberInit.get(), 2375 InitRange.getBegin()); 2376 2377 // C++0x [class.base.init]p7: 2378 // The initialization of each base and member constitutes a 2379 // full-expression. 2380 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2381 if (MemberInit.isInvalid()) 2382 return true; 2383 2384 Init = MemberInit.get(); 2385 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2386 } 2387 2388 if (DirectMember) { 2389 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2390 InitRange.getBegin(), Init, 2391 InitRange.getEnd()); 2392 } else { 2393 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2394 InitRange.getBegin(), Init, 2395 InitRange.getEnd()); 2396 } 2397} 2398 2399MemInitResult 2400Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2401 CXXRecordDecl *ClassDecl) { 2402 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2403 if (!LangOpts.CPlusPlus11) 2404 return Diag(NameLoc, diag::err_delegating_ctor) 2405 << TInfo->getTypeLoc().getLocalSourceRange(); 2406 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2407 2408 bool InitList = true; 2409 Expr **Args = &Init; 2410 unsigned NumArgs = 1; 2411 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2412 InitList = false; 2413 Args = ParenList->getExprs(); 2414 NumArgs = ParenList->getNumExprs(); 2415 } 2416 2417 SourceRange InitRange = Init->getSourceRange(); 2418 // Initialize the object. 2419 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2420 QualType(ClassDecl->getTypeForDecl(), 0)); 2421 InitializationKind Kind = 2422 InitList ? InitializationKind::CreateDirectList(NameLoc) 2423 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2424 InitRange.getEnd()); 2425 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2426 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2427 MultiExprArg(Args, NumArgs), 2428 0); 2429 if (DelegationInit.isInvalid()) 2430 return true; 2431 2432 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2433 "Delegating constructor with no target?"); 2434 2435 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2436 2437 // C++0x [class.base.init]p7: 2438 // The initialization of each base and member constitutes a 2439 // full-expression. 2440 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2441 if (DelegationInit.isInvalid()) 2442 return true; 2443 2444 // If we are in a dependent context, template instantiation will 2445 // perform this type-checking again. Just save the arguments that we 2446 // received in a ParenListExpr. 2447 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2448 // of the information that we have about the base 2449 // initializer. However, deconstructing the ASTs is a dicey process, 2450 // and this approach is far more likely to get the corner cases right. 2451 if (CurContext->isDependentContext()) 2452 DelegationInit = Owned(Init); 2453 2454 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2455 DelegationInit.takeAs<Expr>(), 2456 InitRange.getEnd()); 2457} 2458 2459MemInitResult 2460Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2461 Expr *Init, CXXRecordDecl *ClassDecl, 2462 SourceLocation EllipsisLoc) { 2463 SourceLocation BaseLoc 2464 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2465 2466 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2467 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2468 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2469 2470 // C++ [class.base.init]p2: 2471 // [...] Unless the mem-initializer-id names a nonstatic data 2472 // member of the constructor's class or a direct or virtual base 2473 // of that class, the mem-initializer is ill-formed. A 2474 // mem-initializer-list can initialize a base class using any 2475 // name that denotes that base class type. 2476 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2477 2478 SourceRange InitRange = Init->getSourceRange(); 2479 if (EllipsisLoc.isValid()) { 2480 // This is a pack expansion. 2481 if (!BaseType->containsUnexpandedParameterPack()) { 2482 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2483 << SourceRange(BaseLoc, InitRange.getEnd()); 2484 2485 EllipsisLoc = SourceLocation(); 2486 } 2487 } else { 2488 // Check for any unexpanded parameter packs. 2489 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2490 return true; 2491 2492 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2493 return true; 2494 } 2495 2496 // Check for direct and virtual base classes. 2497 const CXXBaseSpecifier *DirectBaseSpec = 0; 2498 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2499 if (!Dependent) { 2500 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2501 BaseType)) 2502 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2503 2504 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2505 VirtualBaseSpec); 2506 2507 // C++ [base.class.init]p2: 2508 // Unless the mem-initializer-id names a nonstatic data member of the 2509 // constructor's class or a direct or virtual base of that class, the 2510 // mem-initializer is ill-formed. 2511 if (!DirectBaseSpec && !VirtualBaseSpec) { 2512 // If the class has any dependent bases, then it's possible that 2513 // one of those types will resolve to the same type as 2514 // BaseType. Therefore, just treat this as a dependent base 2515 // class initialization. FIXME: Should we try to check the 2516 // initialization anyway? It seems odd. 2517 if (ClassDecl->hasAnyDependentBases()) 2518 Dependent = true; 2519 else 2520 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2521 << BaseType << Context.getTypeDeclType(ClassDecl) 2522 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2523 } 2524 } 2525 2526 if (Dependent) { 2527 DiscardCleanupsInEvaluationContext(); 2528 2529 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2530 /*IsVirtual=*/false, 2531 InitRange.getBegin(), Init, 2532 InitRange.getEnd(), EllipsisLoc); 2533 } 2534 2535 // C++ [base.class.init]p2: 2536 // If a mem-initializer-id is ambiguous because it designates both 2537 // a direct non-virtual base class and an inherited virtual base 2538 // class, the mem-initializer is ill-formed. 2539 if (DirectBaseSpec && VirtualBaseSpec) 2540 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2541 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2542 2543 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2544 if (!BaseSpec) 2545 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2546 2547 // Initialize the base. 2548 bool InitList = true; 2549 Expr **Args = &Init; 2550 unsigned NumArgs = 1; 2551 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2552 InitList = false; 2553 Args = ParenList->getExprs(); 2554 NumArgs = ParenList->getNumExprs(); 2555 } 2556 2557 InitializedEntity BaseEntity = 2558 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2559 InitializationKind Kind = 2560 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2561 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2562 InitRange.getEnd()); 2563 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2564 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2565 MultiExprArg(Args, NumArgs), 0); 2566 if (BaseInit.isInvalid()) 2567 return true; 2568 2569 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2570 2571 // C++0x [class.base.init]p7: 2572 // The initialization of each base and member constitutes a 2573 // full-expression. 2574 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2575 if (BaseInit.isInvalid()) 2576 return true; 2577 2578 // If we are in a dependent context, template instantiation will 2579 // perform this type-checking again. Just save the arguments that we 2580 // received in a ParenListExpr. 2581 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2582 // of the information that we have about the base 2583 // initializer. However, deconstructing the ASTs is a dicey process, 2584 // and this approach is far more likely to get the corner cases right. 2585 if (CurContext->isDependentContext()) 2586 BaseInit = Owned(Init); 2587 2588 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2589 BaseSpec->isVirtual(), 2590 InitRange.getBegin(), 2591 BaseInit.takeAs<Expr>(), 2592 InitRange.getEnd(), EllipsisLoc); 2593} 2594 2595// Create a static_cast\<T&&>(expr). 2596static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2597 QualType ExprType = E->getType(); 2598 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2599 SourceLocation ExprLoc = E->getLocStart(); 2600 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2601 TargetType, ExprLoc); 2602 2603 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2604 SourceRange(ExprLoc, ExprLoc), 2605 E->getSourceRange()).take(); 2606} 2607 2608/// ImplicitInitializerKind - How an implicit base or member initializer should 2609/// initialize its base or member. 2610enum ImplicitInitializerKind { 2611 IIK_Default, 2612 IIK_Copy, 2613 IIK_Move 2614}; 2615 2616static bool 2617BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2618 ImplicitInitializerKind ImplicitInitKind, 2619 CXXBaseSpecifier *BaseSpec, 2620 bool IsInheritedVirtualBase, 2621 CXXCtorInitializer *&CXXBaseInit) { 2622 InitializedEntity InitEntity 2623 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2624 IsInheritedVirtualBase); 2625 2626 ExprResult BaseInit; 2627 2628 switch (ImplicitInitKind) { 2629 case IIK_Default: { 2630 InitializationKind InitKind 2631 = InitializationKind::CreateDefault(Constructor->getLocation()); 2632 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2633 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2634 break; 2635 } 2636 2637 case IIK_Move: 2638 case IIK_Copy: { 2639 bool Moving = ImplicitInitKind == IIK_Move; 2640 ParmVarDecl *Param = Constructor->getParamDecl(0); 2641 QualType ParamType = Param->getType().getNonReferenceType(); 2642 2643 Expr *CopyCtorArg = 2644 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2645 SourceLocation(), Param, false, 2646 Constructor->getLocation(), ParamType, 2647 VK_LValue, 0); 2648 2649 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2650 2651 // Cast to the base class to avoid ambiguities. 2652 QualType ArgTy = 2653 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2654 ParamType.getQualifiers()); 2655 2656 if (Moving) { 2657 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2658 } 2659 2660 CXXCastPath BasePath; 2661 BasePath.push_back(BaseSpec); 2662 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2663 CK_UncheckedDerivedToBase, 2664 Moving ? VK_XValue : VK_LValue, 2665 &BasePath).take(); 2666 2667 InitializationKind InitKind 2668 = InitializationKind::CreateDirect(Constructor->getLocation(), 2669 SourceLocation(), SourceLocation()); 2670 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2671 &CopyCtorArg, 1); 2672 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2673 MultiExprArg(&CopyCtorArg, 1)); 2674 break; 2675 } 2676 } 2677 2678 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2679 if (BaseInit.isInvalid()) 2680 return true; 2681 2682 CXXBaseInit = 2683 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2684 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2685 SourceLocation()), 2686 BaseSpec->isVirtual(), 2687 SourceLocation(), 2688 BaseInit.takeAs<Expr>(), 2689 SourceLocation(), 2690 SourceLocation()); 2691 2692 return false; 2693} 2694 2695static bool RefersToRValueRef(Expr *MemRef) { 2696 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2697 return Referenced->getType()->isRValueReferenceType(); 2698} 2699 2700static bool 2701BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2702 ImplicitInitializerKind ImplicitInitKind, 2703 FieldDecl *Field, IndirectFieldDecl *Indirect, 2704 CXXCtorInitializer *&CXXMemberInit) { 2705 if (Field->isInvalidDecl()) 2706 return true; 2707 2708 SourceLocation Loc = Constructor->getLocation(); 2709 2710 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2711 bool Moving = ImplicitInitKind == IIK_Move; 2712 ParmVarDecl *Param = Constructor->getParamDecl(0); 2713 QualType ParamType = Param->getType().getNonReferenceType(); 2714 2715 // Suppress copying zero-width bitfields. 2716 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2717 return false; 2718 2719 Expr *MemberExprBase = 2720 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2721 SourceLocation(), Param, false, 2722 Loc, ParamType, VK_LValue, 0); 2723 2724 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2725 2726 if (Moving) { 2727 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2728 } 2729 2730 // Build a reference to this field within the parameter. 2731 CXXScopeSpec SS; 2732 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2733 Sema::LookupMemberName); 2734 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2735 : cast<ValueDecl>(Field), AS_public); 2736 MemberLookup.resolveKind(); 2737 ExprResult CtorArg 2738 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2739 ParamType, Loc, 2740 /*IsArrow=*/false, 2741 SS, 2742 /*TemplateKWLoc=*/SourceLocation(), 2743 /*FirstQualifierInScope=*/0, 2744 MemberLookup, 2745 /*TemplateArgs=*/0); 2746 if (CtorArg.isInvalid()) 2747 return true; 2748 2749 // C++11 [class.copy]p15: 2750 // - if a member m has rvalue reference type T&&, it is direct-initialized 2751 // with static_cast<T&&>(x.m); 2752 if (RefersToRValueRef(CtorArg.get())) { 2753 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2754 } 2755 2756 // When the field we are copying is an array, create index variables for 2757 // each dimension of the array. We use these index variables to subscript 2758 // the source array, and other clients (e.g., CodeGen) will perform the 2759 // necessary iteration with these index variables. 2760 SmallVector<VarDecl *, 4> IndexVariables; 2761 QualType BaseType = Field->getType(); 2762 QualType SizeType = SemaRef.Context.getSizeType(); 2763 bool InitializingArray = false; 2764 while (const ConstantArrayType *Array 2765 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2766 InitializingArray = true; 2767 // Create the iteration variable for this array index. 2768 IdentifierInfo *IterationVarName = 0; 2769 { 2770 SmallString<8> Str; 2771 llvm::raw_svector_ostream OS(Str); 2772 OS << "__i" << IndexVariables.size(); 2773 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2774 } 2775 VarDecl *IterationVar 2776 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2777 IterationVarName, SizeType, 2778 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2779 SC_None, SC_None); 2780 IndexVariables.push_back(IterationVar); 2781 2782 // Create a reference to the iteration variable. 2783 ExprResult IterationVarRef 2784 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2785 assert(!IterationVarRef.isInvalid() && 2786 "Reference to invented variable cannot fail!"); 2787 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2788 assert(!IterationVarRef.isInvalid() && 2789 "Conversion of invented variable cannot fail!"); 2790 2791 // Subscript the array with this iteration variable. 2792 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2793 IterationVarRef.take(), 2794 Loc); 2795 if (CtorArg.isInvalid()) 2796 return true; 2797 2798 BaseType = Array->getElementType(); 2799 } 2800 2801 // The array subscript expression is an lvalue, which is wrong for moving. 2802 if (Moving && InitializingArray) 2803 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2804 2805 // Construct the entity that we will be initializing. For an array, this 2806 // will be first element in the array, which may require several levels 2807 // of array-subscript entities. 2808 SmallVector<InitializedEntity, 4> Entities; 2809 Entities.reserve(1 + IndexVariables.size()); 2810 if (Indirect) 2811 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2812 else 2813 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2814 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2815 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2816 0, 2817 Entities.back())); 2818 2819 // Direct-initialize to use the copy constructor. 2820 InitializationKind InitKind = 2821 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2822 2823 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2824 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2825 &CtorArgE, 1); 2826 2827 ExprResult MemberInit 2828 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2829 MultiExprArg(&CtorArgE, 1)); 2830 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2831 if (MemberInit.isInvalid()) 2832 return true; 2833 2834 if (Indirect) { 2835 assert(IndexVariables.size() == 0 && 2836 "Indirect field improperly initialized"); 2837 CXXMemberInit 2838 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2839 Loc, Loc, 2840 MemberInit.takeAs<Expr>(), 2841 Loc); 2842 } else 2843 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2844 Loc, MemberInit.takeAs<Expr>(), 2845 Loc, 2846 IndexVariables.data(), 2847 IndexVariables.size()); 2848 return false; 2849 } 2850 2851 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2852 2853 QualType FieldBaseElementType = 2854 SemaRef.Context.getBaseElementType(Field->getType()); 2855 2856 if (FieldBaseElementType->isRecordType()) { 2857 InitializedEntity InitEntity 2858 = Indirect? InitializedEntity::InitializeMember(Indirect) 2859 : InitializedEntity::InitializeMember(Field); 2860 InitializationKind InitKind = 2861 InitializationKind::CreateDefault(Loc); 2862 2863 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2864 ExprResult MemberInit = 2865 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2866 2867 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2868 if (MemberInit.isInvalid()) 2869 return true; 2870 2871 if (Indirect) 2872 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2873 Indirect, Loc, 2874 Loc, 2875 MemberInit.get(), 2876 Loc); 2877 else 2878 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2879 Field, Loc, Loc, 2880 MemberInit.get(), 2881 Loc); 2882 return false; 2883 } 2884 2885 if (!Field->getParent()->isUnion()) { 2886 if (FieldBaseElementType->isReferenceType()) { 2887 SemaRef.Diag(Constructor->getLocation(), 2888 diag::err_uninitialized_member_in_ctor) 2889 << (int)Constructor->isImplicit() 2890 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2891 << 0 << Field->getDeclName(); 2892 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2893 return true; 2894 } 2895 2896 if (FieldBaseElementType.isConstQualified()) { 2897 SemaRef.Diag(Constructor->getLocation(), 2898 diag::err_uninitialized_member_in_ctor) 2899 << (int)Constructor->isImplicit() 2900 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2901 << 1 << Field->getDeclName(); 2902 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2903 return true; 2904 } 2905 } 2906 2907 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2908 FieldBaseElementType->isObjCRetainableType() && 2909 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2910 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2911 // ARC: 2912 // Default-initialize Objective-C pointers to NULL. 2913 CXXMemberInit 2914 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2915 Loc, Loc, 2916 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2917 Loc); 2918 return false; 2919 } 2920 2921 // Nothing to initialize. 2922 CXXMemberInit = 0; 2923 return false; 2924} 2925 2926namespace { 2927struct BaseAndFieldInfo { 2928 Sema &S; 2929 CXXConstructorDecl *Ctor; 2930 bool AnyErrorsInInits; 2931 ImplicitInitializerKind IIK; 2932 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2933 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2934 2935 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2936 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2937 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2938 if (Generated && Ctor->isCopyConstructor()) 2939 IIK = IIK_Copy; 2940 else if (Generated && Ctor->isMoveConstructor()) 2941 IIK = IIK_Move; 2942 else 2943 IIK = IIK_Default; 2944 } 2945 2946 bool isImplicitCopyOrMove() const { 2947 switch (IIK) { 2948 case IIK_Copy: 2949 case IIK_Move: 2950 return true; 2951 2952 case IIK_Default: 2953 return false; 2954 } 2955 2956 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2957 } 2958 2959 bool addFieldInitializer(CXXCtorInitializer *Init) { 2960 AllToInit.push_back(Init); 2961 2962 // Check whether this initializer makes the field "used". 2963 if (Init->getInit() && Init->getInit()->HasSideEffects(S.Context)) 2964 S.UnusedPrivateFields.remove(Init->getAnyMember()); 2965 2966 return false; 2967 } 2968}; 2969} 2970 2971/// \brief Determine whether the given indirect field declaration is somewhere 2972/// within an anonymous union. 2973static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2974 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2975 CEnd = F->chain_end(); 2976 C != CEnd; ++C) 2977 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2978 if (Record->isUnion()) 2979 return true; 2980 2981 return false; 2982} 2983 2984/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2985/// array type. 2986static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2987 if (T->isIncompleteArrayType()) 2988 return true; 2989 2990 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2991 if (!ArrayT->getSize()) 2992 return true; 2993 2994 T = ArrayT->getElementType(); 2995 } 2996 2997 return false; 2998} 2999 3000static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 3001 FieldDecl *Field, 3002 IndirectFieldDecl *Indirect = 0) { 3003 3004 // Overwhelmingly common case: we have a direct initializer for this field. 3005 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) 3006 return Info.addFieldInitializer(Init); 3007 3008 // C++11 [class.base.init]p8: if the entity is a non-static data member that 3009 // has a brace-or-equal-initializer, the entity is initialized as specified 3010 // in [dcl.init]. 3011 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 3012 CXXCtorInitializer *Init; 3013 if (Indirect) 3014 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 3015 SourceLocation(), 3016 SourceLocation(), 0, 3017 SourceLocation()); 3018 else 3019 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 3020 SourceLocation(), 3021 SourceLocation(), 0, 3022 SourceLocation()); 3023 return Info.addFieldInitializer(Init); 3024 } 3025 3026 // Don't build an implicit initializer for union members if none was 3027 // explicitly specified. 3028 if (Field->getParent()->isUnion() || 3029 (Indirect && isWithinAnonymousUnion(Indirect))) 3030 return false; 3031 3032 // Don't initialize incomplete or zero-length arrays. 3033 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 3034 return false; 3035 3036 // Don't try to build an implicit initializer if there were semantic 3037 // errors in any of the initializers (and therefore we might be 3038 // missing some that the user actually wrote). 3039 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 3040 return false; 3041 3042 CXXCtorInitializer *Init = 0; 3043 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 3044 Indirect, Init)) 3045 return true; 3046 3047 if (!Init) 3048 return false; 3049 3050 return Info.addFieldInitializer(Init); 3051} 3052 3053bool 3054Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 3055 CXXCtorInitializer *Initializer) { 3056 assert(Initializer->isDelegatingInitializer()); 3057 Constructor->setNumCtorInitializers(1); 3058 CXXCtorInitializer **initializer = 3059 new (Context) CXXCtorInitializer*[1]; 3060 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 3061 Constructor->setCtorInitializers(initializer); 3062 3063 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 3064 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 3065 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 3066 } 3067 3068 DelegatingCtorDecls.push_back(Constructor); 3069 3070 return false; 3071} 3072 3073bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 3074 CXXCtorInitializer **Initializers, 3075 unsigned NumInitializers, 3076 bool AnyErrors) { 3077 if (Constructor->isDependentContext()) { 3078 // Just store the initializers as written, they will be checked during 3079 // instantiation. 3080 if (NumInitializers > 0) { 3081 Constructor->setNumCtorInitializers(NumInitializers); 3082 CXXCtorInitializer **baseOrMemberInitializers = 3083 new (Context) CXXCtorInitializer*[NumInitializers]; 3084 memcpy(baseOrMemberInitializers, Initializers, 3085 NumInitializers * sizeof(CXXCtorInitializer*)); 3086 Constructor->setCtorInitializers(baseOrMemberInitializers); 3087 } 3088 3089 // Let template instantiation know whether we had errors. 3090 if (AnyErrors) 3091 Constructor->setInvalidDecl(); 3092 3093 return false; 3094 } 3095 3096 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 3097 3098 // We need to build the initializer AST according to order of construction 3099 // and not what user specified in the Initializers list. 3100 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 3101 if (!ClassDecl) 3102 return true; 3103 3104 bool HadError = false; 3105 3106 for (unsigned i = 0; i < NumInitializers; i++) { 3107 CXXCtorInitializer *Member = Initializers[i]; 3108 3109 if (Member->isBaseInitializer()) 3110 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 3111 else 3112 Info.AllBaseFields[Member->getAnyMember()] = Member; 3113 } 3114 3115 // Keep track of the direct virtual bases. 3116 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 3117 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 3118 E = ClassDecl->bases_end(); I != E; ++I) { 3119 if (I->isVirtual()) 3120 DirectVBases.insert(I); 3121 } 3122 3123 // Push virtual bases before others. 3124 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3125 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3126 3127 if (CXXCtorInitializer *Value 3128 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 3129 Info.AllToInit.push_back(Value); 3130 } else if (!AnyErrors) { 3131 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 3132 CXXCtorInitializer *CXXBaseInit; 3133 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3134 VBase, IsInheritedVirtualBase, 3135 CXXBaseInit)) { 3136 HadError = true; 3137 continue; 3138 } 3139 3140 Info.AllToInit.push_back(CXXBaseInit); 3141 } 3142 } 3143 3144 // Non-virtual bases. 3145 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3146 E = ClassDecl->bases_end(); Base != E; ++Base) { 3147 // Virtuals are in the virtual base list and already constructed. 3148 if (Base->isVirtual()) 3149 continue; 3150 3151 if (CXXCtorInitializer *Value 3152 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3153 Info.AllToInit.push_back(Value); 3154 } else if (!AnyErrors) { 3155 CXXCtorInitializer *CXXBaseInit; 3156 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3157 Base, /*IsInheritedVirtualBase=*/false, 3158 CXXBaseInit)) { 3159 HadError = true; 3160 continue; 3161 } 3162 3163 Info.AllToInit.push_back(CXXBaseInit); 3164 } 3165 } 3166 3167 // Fields. 3168 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3169 MemEnd = ClassDecl->decls_end(); 3170 Mem != MemEnd; ++Mem) { 3171 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3172 // C++ [class.bit]p2: 3173 // A declaration for a bit-field that omits the identifier declares an 3174 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3175 // initialized. 3176 if (F->isUnnamedBitfield()) 3177 continue; 3178 3179 // If we're not generating the implicit copy/move constructor, then we'll 3180 // handle anonymous struct/union fields based on their individual 3181 // indirect fields. 3182 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 3183 continue; 3184 3185 if (CollectFieldInitializer(*this, Info, F)) 3186 HadError = true; 3187 continue; 3188 } 3189 3190 // Beyond this point, we only consider default initialization. 3191 if (Info.IIK != IIK_Default) 3192 continue; 3193 3194 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3195 if (F->getType()->isIncompleteArrayType()) { 3196 assert(ClassDecl->hasFlexibleArrayMember() && 3197 "Incomplete array type is not valid"); 3198 continue; 3199 } 3200 3201 // Initialize each field of an anonymous struct individually. 3202 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3203 HadError = true; 3204 3205 continue; 3206 } 3207 } 3208 3209 NumInitializers = Info.AllToInit.size(); 3210 if (NumInitializers > 0) { 3211 Constructor->setNumCtorInitializers(NumInitializers); 3212 CXXCtorInitializer **baseOrMemberInitializers = 3213 new (Context) CXXCtorInitializer*[NumInitializers]; 3214 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3215 NumInitializers * sizeof(CXXCtorInitializer*)); 3216 Constructor->setCtorInitializers(baseOrMemberInitializers); 3217 3218 // Constructors implicitly reference the base and member 3219 // destructors. 3220 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3221 Constructor->getParent()); 3222 } 3223 3224 return HadError; 3225} 3226 3227static void *GetKeyForTopLevelField(FieldDecl *Field) { 3228 // For anonymous unions, use the class declaration as the key. 3229 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3230 if (RT->getDecl()->isAnonymousStructOrUnion()) 3231 return static_cast<void *>(RT->getDecl()); 3232 } 3233 return static_cast<void *>(Field); 3234} 3235 3236static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3237 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3238} 3239 3240static void *GetKeyForMember(ASTContext &Context, 3241 CXXCtorInitializer *Member) { 3242 if (!Member->isAnyMemberInitializer()) 3243 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3244 3245 // For fields injected into the class via declaration of an anonymous union, 3246 // use its anonymous union class declaration as the unique key. 3247 FieldDecl *Field = Member->getAnyMember(); 3248 3249 // If the field is a member of an anonymous struct or union, our key 3250 // is the anonymous record decl that's a direct child of the class. 3251 RecordDecl *RD = Field->getParent(); 3252 if (RD->isAnonymousStructOrUnion()) { 3253 while (true) { 3254 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3255 if (Parent->isAnonymousStructOrUnion()) 3256 RD = Parent; 3257 else 3258 break; 3259 } 3260 3261 return static_cast<void *>(RD); 3262 } 3263 3264 return static_cast<void *>(Field); 3265} 3266 3267static void 3268DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3269 const CXXConstructorDecl *Constructor, 3270 CXXCtorInitializer **Inits, 3271 unsigned NumInits) { 3272 if (Constructor->getDeclContext()->isDependentContext()) 3273 return; 3274 3275 // Don't check initializers order unless the warning is enabled at the 3276 // location of at least one initializer. 3277 bool ShouldCheckOrder = false; 3278 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3279 CXXCtorInitializer *Init = Inits[InitIndex]; 3280 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3281 Init->getSourceLocation()) 3282 != DiagnosticsEngine::Ignored) { 3283 ShouldCheckOrder = true; 3284 break; 3285 } 3286 } 3287 if (!ShouldCheckOrder) 3288 return; 3289 3290 // Build the list of bases and members in the order that they'll 3291 // actually be initialized. The explicit initializers should be in 3292 // this same order but may be missing things. 3293 SmallVector<const void*, 32> IdealInitKeys; 3294 3295 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3296 3297 // 1. Virtual bases. 3298 for (CXXRecordDecl::base_class_const_iterator VBase = 3299 ClassDecl->vbases_begin(), 3300 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3301 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3302 3303 // 2. Non-virtual bases. 3304 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3305 E = ClassDecl->bases_end(); Base != E; ++Base) { 3306 if (Base->isVirtual()) 3307 continue; 3308 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3309 } 3310 3311 // 3. Direct fields. 3312 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3313 E = ClassDecl->field_end(); Field != E; ++Field) { 3314 if (Field->isUnnamedBitfield()) 3315 continue; 3316 3317 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3318 } 3319 3320 unsigned NumIdealInits = IdealInitKeys.size(); 3321 unsigned IdealIndex = 0; 3322 3323 CXXCtorInitializer *PrevInit = 0; 3324 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3325 CXXCtorInitializer *Init = Inits[InitIndex]; 3326 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3327 3328 // Scan forward to try to find this initializer in the idealized 3329 // initializers list. 3330 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3331 if (InitKey == IdealInitKeys[IdealIndex]) 3332 break; 3333 3334 // If we didn't find this initializer, it must be because we 3335 // scanned past it on a previous iteration. That can only 3336 // happen if we're out of order; emit a warning. 3337 if (IdealIndex == NumIdealInits && PrevInit) { 3338 Sema::SemaDiagnosticBuilder D = 3339 SemaRef.Diag(PrevInit->getSourceLocation(), 3340 diag::warn_initializer_out_of_order); 3341 3342 if (PrevInit->isAnyMemberInitializer()) 3343 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3344 else 3345 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3346 3347 if (Init->isAnyMemberInitializer()) 3348 D << 0 << Init->getAnyMember()->getDeclName(); 3349 else 3350 D << 1 << Init->getTypeSourceInfo()->getType(); 3351 3352 // Move back to the initializer's location in the ideal list. 3353 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3354 if (InitKey == IdealInitKeys[IdealIndex]) 3355 break; 3356 3357 assert(IdealIndex != NumIdealInits && 3358 "initializer not found in initializer list"); 3359 } 3360 3361 PrevInit = Init; 3362 } 3363} 3364 3365namespace { 3366bool CheckRedundantInit(Sema &S, 3367 CXXCtorInitializer *Init, 3368 CXXCtorInitializer *&PrevInit) { 3369 if (!PrevInit) { 3370 PrevInit = Init; 3371 return false; 3372 } 3373 3374 if (FieldDecl *Field = Init->getMember()) 3375 S.Diag(Init->getSourceLocation(), 3376 diag::err_multiple_mem_initialization) 3377 << Field->getDeclName() 3378 << Init->getSourceRange(); 3379 else { 3380 const Type *BaseClass = Init->getBaseClass(); 3381 assert(BaseClass && "neither field nor base"); 3382 S.Diag(Init->getSourceLocation(), 3383 diag::err_multiple_base_initialization) 3384 << QualType(BaseClass, 0) 3385 << Init->getSourceRange(); 3386 } 3387 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3388 << 0 << PrevInit->getSourceRange(); 3389 3390 return true; 3391} 3392 3393typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3394typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3395 3396bool CheckRedundantUnionInit(Sema &S, 3397 CXXCtorInitializer *Init, 3398 RedundantUnionMap &Unions) { 3399 FieldDecl *Field = Init->getAnyMember(); 3400 RecordDecl *Parent = Field->getParent(); 3401 NamedDecl *Child = Field; 3402 3403 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3404 if (Parent->isUnion()) { 3405 UnionEntry &En = Unions[Parent]; 3406 if (En.first && En.first != Child) { 3407 S.Diag(Init->getSourceLocation(), 3408 diag::err_multiple_mem_union_initialization) 3409 << Field->getDeclName() 3410 << Init->getSourceRange(); 3411 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3412 << 0 << En.second->getSourceRange(); 3413 return true; 3414 } 3415 if (!En.first) { 3416 En.first = Child; 3417 En.second = Init; 3418 } 3419 if (!Parent->isAnonymousStructOrUnion()) 3420 return false; 3421 } 3422 3423 Child = Parent; 3424 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3425 } 3426 3427 return false; 3428} 3429} 3430 3431/// ActOnMemInitializers - Handle the member initializers for a constructor. 3432void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3433 SourceLocation ColonLoc, 3434 CXXCtorInitializer **meminits, 3435 unsigned NumMemInits, 3436 bool AnyErrors) { 3437 if (!ConstructorDecl) 3438 return; 3439 3440 AdjustDeclIfTemplate(ConstructorDecl); 3441 3442 CXXConstructorDecl *Constructor 3443 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3444 3445 if (!Constructor) { 3446 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3447 return; 3448 } 3449 3450 CXXCtorInitializer **MemInits = 3451 reinterpret_cast<CXXCtorInitializer **>(meminits); 3452 3453 // Mapping for the duplicate initializers check. 3454 // For member initializers, this is keyed with a FieldDecl*. 3455 // For base initializers, this is keyed with a Type*. 3456 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3457 3458 // Mapping for the inconsistent anonymous-union initializers check. 3459 RedundantUnionMap MemberUnions; 3460 3461 bool HadError = false; 3462 for (unsigned i = 0; i < NumMemInits; i++) { 3463 CXXCtorInitializer *Init = MemInits[i]; 3464 3465 // Set the source order index. 3466 Init->setSourceOrder(i); 3467 3468 if (Init->isAnyMemberInitializer()) { 3469 FieldDecl *Field = Init->getAnyMember(); 3470 if (CheckRedundantInit(*this, Init, Members[Field]) || 3471 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3472 HadError = true; 3473 } else if (Init->isBaseInitializer()) { 3474 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3475 if (CheckRedundantInit(*this, Init, Members[Key])) 3476 HadError = true; 3477 } else { 3478 assert(Init->isDelegatingInitializer()); 3479 // This must be the only initializer 3480 if (NumMemInits != 1) { 3481 Diag(Init->getSourceLocation(), 3482 diag::err_delegating_initializer_alone) 3483 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange(); 3484 // We will treat this as being the only initializer. 3485 } 3486 SetDelegatingInitializer(Constructor, MemInits[i]); 3487 // Return immediately as the initializer is set. 3488 return; 3489 } 3490 } 3491 3492 if (HadError) 3493 return; 3494 3495 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3496 3497 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3498} 3499 3500void 3501Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3502 CXXRecordDecl *ClassDecl) { 3503 // Ignore dependent contexts. Also ignore unions, since their members never 3504 // have destructors implicitly called. 3505 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3506 return; 3507 3508 // FIXME: all the access-control diagnostics are positioned on the 3509 // field/base declaration. That's probably good; that said, the 3510 // user might reasonably want to know why the destructor is being 3511 // emitted, and we currently don't say. 3512 3513 // Non-static data members. 3514 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3515 E = ClassDecl->field_end(); I != E; ++I) { 3516 FieldDecl *Field = *I; 3517 if (Field->isInvalidDecl()) 3518 continue; 3519 3520 // Don't destroy incomplete or zero-length arrays. 3521 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3522 continue; 3523 3524 QualType FieldType = Context.getBaseElementType(Field->getType()); 3525 3526 const RecordType* RT = FieldType->getAs<RecordType>(); 3527 if (!RT) 3528 continue; 3529 3530 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3531 if (FieldClassDecl->isInvalidDecl()) 3532 continue; 3533 if (FieldClassDecl->hasIrrelevantDestructor()) 3534 continue; 3535 // The destructor for an implicit anonymous union member is never invoked. 3536 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3537 continue; 3538 3539 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3540 assert(Dtor && "No dtor found for FieldClassDecl!"); 3541 CheckDestructorAccess(Field->getLocation(), Dtor, 3542 PDiag(diag::err_access_dtor_field) 3543 << Field->getDeclName() 3544 << FieldType); 3545 3546 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3547 DiagnoseUseOfDecl(Dtor, Location); 3548 } 3549 3550 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3551 3552 // Bases. 3553 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3554 E = ClassDecl->bases_end(); Base != E; ++Base) { 3555 // Bases are always records in a well-formed non-dependent class. 3556 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3557 3558 // Remember direct virtual bases. 3559 if (Base->isVirtual()) 3560 DirectVirtualBases.insert(RT); 3561 3562 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3563 // If our base class is invalid, we probably can't get its dtor anyway. 3564 if (BaseClassDecl->isInvalidDecl()) 3565 continue; 3566 if (BaseClassDecl->hasIrrelevantDestructor()) 3567 continue; 3568 3569 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3570 assert(Dtor && "No dtor found for BaseClassDecl!"); 3571 3572 // FIXME: caret should be on the start of the class name 3573 CheckDestructorAccess(Base->getLocStart(), Dtor, 3574 PDiag(diag::err_access_dtor_base) 3575 << Base->getType() 3576 << Base->getSourceRange(), 3577 Context.getTypeDeclType(ClassDecl)); 3578 3579 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3580 DiagnoseUseOfDecl(Dtor, Location); 3581 } 3582 3583 // Virtual bases. 3584 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3585 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3586 3587 // Bases are always records in a well-formed non-dependent class. 3588 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3589 3590 // Ignore direct virtual bases. 3591 if (DirectVirtualBases.count(RT)) 3592 continue; 3593 3594 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3595 // If our base class is invalid, we probably can't get its dtor anyway. 3596 if (BaseClassDecl->isInvalidDecl()) 3597 continue; 3598 if (BaseClassDecl->hasIrrelevantDestructor()) 3599 continue; 3600 3601 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3602 assert(Dtor && "No dtor found for BaseClassDecl!"); 3603 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3604 PDiag(diag::err_access_dtor_vbase) 3605 << VBase->getType(), 3606 Context.getTypeDeclType(ClassDecl)); 3607 3608 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3609 DiagnoseUseOfDecl(Dtor, Location); 3610 } 3611} 3612 3613void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3614 if (!CDtorDecl) 3615 return; 3616 3617 if (CXXConstructorDecl *Constructor 3618 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3619 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3620} 3621 3622bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3623 unsigned DiagID, AbstractDiagSelID SelID) { 3624 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3625 unsigned DiagID; 3626 AbstractDiagSelID SelID; 3627 3628 public: 3629 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3630 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3631 3632 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 3633 if (Suppressed) return; 3634 if (SelID == -1) 3635 S.Diag(Loc, DiagID) << T; 3636 else 3637 S.Diag(Loc, DiagID) << SelID << T; 3638 } 3639 } Diagnoser(DiagID, SelID); 3640 3641 return RequireNonAbstractType(Loc, T, Diagnoser); 3642} 3643 3644bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3645 TypeDiagnoser &Diagnoser) { 3646 if (!getLangOpts().CPlusPlus) 3647 return false; 3648 3649 if (const ArrayType *AT = Context.getAsArrayType(T)) 3650 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3651 3652 if (const PointerType *PT = T->getAs<PointerType>()) { 3653 // Find the innermost pointer type. 3654 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3655 PT = T; 3656 3657 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3658 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3659 } 3660 3661 const RecordType *RT = T->getAs<RecordType>(); 3662 if (!RT) 3663 return false; 3664 3665 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3666 3667 // We can't answer whether something is abstract until it has a 3668 // definition. If it's currently being defined, we'll walk back 3669 // over all the declarations when we have a full definition. 3670 const CXXRecordDecl *Def = RD->getDefinition(); 3671 if (!Def || Def->isBeingDefined()) 3672 return false; 3673 3674 if (!RD->isAbstract()) 3675 return false; 3676 3677 Diagnoser.diagnose(*this, Loc, T); 3678 DiagnoseAbstractType(RD); 3679 3680 return true; 3681} 3682 3683void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3684 // Check if we've already emitted the list of pure virtual functions 3685 // for this class. 3686 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3687 return; 3688 3689 CXXFinalOverriderMap FinalOverriders; 3690 RD->getFinalOverriders(FinalOverriders); 3691 3692 // Keep a set of seen pure methods so we won't diagnose the same method 3693 // more than once. 3694 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3695 3696 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3697 MEnd = FinalOverriders.end(); 3698 M != MEnd; 3699 ++M) { 3700 for (OverridingMethods::iterator SO = M->second.begin(), 3701 SOEnd = M->second.end(); 3702 SO != SOEnd; ++SO) { 3703 // C++ [class.abstract]p4: 3704 // A class is abstract if it contains or inherits at least one 3705 // pure virtual function for which the final overrider is pure 3706 // virtual. 3707 3708 // 3709 if (SO->second.size() != 1) 3710 continue; 3711 3712 if (!SO->second.front().Method->isPure()) 3713 continue; 3714 3715 if (!SeenPureMethods.insert(SO->second.front().Method)) 3716 continue; 3717 3718 Diag(SO->second.front().Method->getLocation(), 3719 diag::note_pure_virtual_function) 3720 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3721 } 3722 } 3723 3724 if (!PureVirtualClassDiagSet) 3725 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3726 PureVirtualClassDiagSet->insert(RD); 3727} 3728 3729namespace { 3730struct AbstractUsageInfo { 3731 Sema &S; 3732 CXXRecordDecl *Record; 3733 CanQualType AbstractType; 3734 bool Invalid; 3735 3736 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3737 : S(S), Record(Record), 3738 AbstractType(S.Context.getCanonicalType( 3739 S.Context.getTypeDeclType(Record))), 3740 Invalid(false) {} 3741 3742 void DiagnoseAbstractType() { 3743 if (Invalid) return; 3744 S.DiagnoseAbstractType(Record); 3745 Invalid = true; 3746 } 3747 3748 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3749}; 3750 3751struct CheckAbstractUsage { 3752 AbstractUsageInfo &Info; 3753 const NamedDecl *Ctx; 3754 3755 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3756 : Info(Info), Ctx(Ctx) {} 3757 3758 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3759 switch (TL.getTypeLocClass()) { 3760#define ABSTRACT_TYPELOC(CLASS, PARENT) 3761#define TYPELOC(CLASS, PARENT) \ 3762 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3763#include "clang/AST/TypeLocNodes.def" 3764 } 3765 } 3766 3767 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3768 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3769 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3770 if (!TL.getArg(I)) 3771 continue; 3772 3773 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3774 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3775 } 3776 } 3777 3778 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3779 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3780 } 3781 3782 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3783 // Visit the type parameters from a permissive context. 3784 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3785 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3786 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3787 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3788 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3789 // TODO: other template argument types? 3790 } 3791 } 3792 3793 // Visit pointee types from a permissive context. 3794#define CheckPolymorphic(Type) \ 3795 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3796 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3797 } 3798 CheckPolymorphic(PointerTypeLoc) 3799 CheckPolymorphic(ReferenceTypeLoc) 3800 CheckPolymorphic(MemberPointerTypeLoc) 3801 CheckPolymorphic(BlockPointerTypeLoc) 3802 CheckPolymorphic(AtomicTypeLoc) 3803 3804 /// Handle all the types we haven't given a more specific 3805 /// implementation for above. 3806 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3807 // Every other kind of type that we haven't called out already 3808 // that has an inner type is either (1) sugar or (2) contains that 3809 // inner type in some way as a subobject. 3810 if (TypeLoc Next = TL.getNextTypeLoc()) 3811 return Visit(Next, Sel); 3812 3813 // If there's no inner type and we're in a permissive context, 3814 // don't diagnose. 3815 if (Sel == Sema::AbstractNone) return; 3816 3817 // Check whether the type matches the abstract type. 3818 QualType T = TL.getType(); 3819 if (T->isArrayType()) { 3820 Sel = Sema::AbstractArrayType; 3821 T = Info.S.Context.getBaseElementType(T); 3822 } 3823 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3824 if (CT != Info.AbstractType) return; 3825 3826 // It matched; do some magic. 3827 if (Sel == Sema::AbstractArrayType) { 3828 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3829 << T << TL.getSourceRange(); 3830 } else { 3831 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3832 << Sel << T << TL.getSourceRange(); 3833 } 3834 Info.DiagnoseAbstractType(); 3835 } 3836}; 3837 3838void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3839 Sema::AbstractDiagSelID Sel) { 3840 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3841} 3842 3843} 3844 3845/// Check for invalid uses of an abstract type in a method declaration. 3846static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3847 CXXMethodDecl *MD) { 3848 // No need to do the check on definitions, which require that 3849 // the return/param types be complete. 3850 if (MD->doesThisDeclarationHaveABody()) 3851 return; 3852 3853 // For safety's sake, just ignore it if we don't have type source 3854 // information. This should never happen for non-implicit methods, 3855 // but... 3856 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3857 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3858} 3859 3860/// Check for invalid uses of an abstract type within a class definition. 3861static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3862 CXXRecordDecl *RD) { 3863 for (CXXRecordDecl::decl_iterator 3864 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3865 Decl *D = *I; 3866 if (D->isImplicit()) continue; 3867 3868 // Methods and method templates. 3869 if (isa<CXXMethodDecl>(D)) { 3870 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3871 } else if (isa<FunctionTemplateDecl>(D)) { 3872 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3873 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3874 3875 // Fields and static variables. 3876 } else if (isa<FieldDecl>(D)) { 3877 FieldDecl *FD = cast<FieldDecl>(D); 3878 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3879 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3880 } else if (isa<VarDecl>(D)) { 3881 VarDecl *VD = cast<VarDecl>(D); 3882 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3883 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3884 3885 // Nested classes and class templates. 3886 } else if (isa<CXXRecordDecl>(D)) { 3887 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3888 } else if (isa<ClassTemplateDecl>(D)) { 3889 CheckAbstractClassUsage(Info, 3890 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3891 } 3892 } 3893} 3894 3895/// \brief Perform semantic checks on a class definition that has been 3896/// completing, introducing implicitly-declared members, checking for 3897/// abstract types, etc. 3898void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3899 if (!Record) 3900 return; 3901 3902 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3903 AbstractUsageInfo Info(*this, Record); 3904 CheckAbstractClassUsage(Info, Record); 3905 } 3906 3907 // If this is not an aggregate type and has no user-declared constructor, 3908 // complain about any non-static data members of reference or const scalar 3909 // type, since they will never get initializers. 3910 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3911 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3912 !Record->isLambda()) { 3913 bool Complained = false; 3914 for (RecordDecl::field_iterator F = Record->field_begin(), 3915 FEnd = Record->field_end(); 3916 F != FEnd; ++F) { 3917 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3918 continue; 3919 3920 if (F->getType()->isReferenceType() || 3921 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3922 if (!Complained) { 3923 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3924 << Record->getTagKind() << Record; 3925 Complained = true; 3926 } 3927 3928 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3929 << F->getType()->isReferenceType() 3930 << F->getDeclName(); 3931 } 3932 } 3933 } 3934 3935 if (Record->isDynamicClass() && !Record->isDependentType()) 3936 DynamicClasses.push_back(Record); 3937 3938 if (Record->getIdentifier()) { 3939 // C++ [class.mem]p13: 3940 // If T is the name of a class, then each of the following shall have a 3941 // name different from T: 3942 // - every member of every anonymous union that is a member of class T. 3943 // 3944 // C++ [class.mem]p14: 3945 // In addition, if class T has a user-declared constructor (12.1), every 3946 // non-static data member of class T shall have a name different from T. 3947 DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3948 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 3949 ++I) { 3950 NamedDecl *D = *I; 3951 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3952 isa<IndirectFieldDecl>(D)) { 3953 Diag(D->getLocation(), diag::err_member_name_of_class) 3954 << D->getDeclName(); 3955 break; 3956 } 3957 } 3958 } 3959 3960 // Warn if the class has virtual methods but non-virtual public destructor. 3961 if (Record->isPolymorphic() && !Record->isDependentType()) { 3962 CXXDestructorDecl *dtor = Record->getDestructor(); 3963 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3964 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3965 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3966 } 3967 3968 if (Record->isAbstract() && Record->hasAttr<FinalAttr>()) { 3969 Diag(Record->getLocation(), diag::warn_abstract_final_class); 3970 DiagnoseAbstractType(Record); 3971 } 3972 3973 if (!Record->isDependentType()) { 3974 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3975 MEnd = Record->method_end(); 3976 M != MEnd; ++M) { 3977 // See if a method overloads virtual methods in a base 3978 // class without overriding any. 3979 if (!M->isStatic()) 3980 DiagnoseHiddenVirtualMethods(Record, *M); 3981 3982 // Check whether the explicitly-defaulted special members are valid. 3983 if (!M->isInvalidDecl() && M->isExplicitlyDefaulted()) 3984 CheckExplicitlyDefaultedSpecialMember(*M); 3985 3986 // For an explicitly defaulted or deleted special member, we defer 3987 // determining triviality until the class is complete. That time is now! 3988 if (!M->isImplicit() && !M->isUserProvided()) { 3989 CXXSpecialMember CSM = getSpecialMember(*M); 3990 if (CSM != CXXInvalid) { 3991 M->setTrivial(SpecialMemberIsTrivial(*M, CSM)); 3992 3993 // Inform the class that we've finished declaring this member. 3994 Record->finishedDefaultedOrDeletedMember(*M); 3995 } 3996 } 3997 } 3998 } 3999 4000 // C++11 [dcl.constexpr]p8: A constexpr specifier for a non-static member 4001 // function that is not a constructor declares that member function to be 4002 // const. [...] The class of which that function is a member shall be 4003 // a literal type. 4004 // 4005 // If the class has virtual bases, any constexpr members will already have 4006 // been diagnosed by the checks performed on the member declaration, so 4007 // suppress this (less useful) diagnostic. 4008 // 4009 // We delay this until we know whether an explicitly-defaulted (or deleted) 4010 // destructor for the class is trivial. 4011 if (LangOpts.CPlusPlus11 && !Record->isDependentType() && 4012 !Record->isLiteral() && !Record->getNumVBases()) { 4013 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 4014 MEnd = Record->method_end(); 4015 M != MEnd; ++M) { 4016 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 4017 switch (Record->getTemplateSpecializationKind()) { 4018 case TSK_ImplicitInstantiation: 4019 case TSK_ExplicitInstantiationDeclaration: 4020 case TSK_ExplicitInstantiationDefinition: 4021 // If a template instantiates to a non-literal type, but its members 4022 // instantiate to constexpr functions, the template is technically 4023 // ill-formed, but we allow it for sanity. 4024 continue; 4025 4026 case TSK_Undeclared: 4027 case TSK_ExplicitSpecialization: 4028 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 4029 diag::err_constexpr_method_non_literal); 4030 break; 4031 } 4032 4033 // Only produce one error per class. 4034 break; 4035 } 4036 } 4037 } 4038 4039 // Declare inherited constructors. We do this eagerly here because: 4040 // - The standard requires an eager diagnostic for conflicting inherited 4041 // constructors from different classes. 4042 // - The lazy declaration of the other implicit constructors is so as to not 4043 // waste space and performance on classes that are not meant to be 4044 // instantiated (e.g. meta-functions). This doesn't apply to classes that 4045 // have inherited constructors. 4046 DeclareInheritedConstructors(Record); 4047} 4048 4049/// Is the special member function which would be selected to perform the 4050/// specified operation on the specified class type a constexpr constructor? 4051static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4052 Sema::CXXSpecialMember CSM, 4053 bool ConstArg) { 4054 Sema::SpecialMemberOverloadResult *SMOR = 4055 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 4056 false, false, false, false); 4057 if (!SMOR || !SMOR->getMethod()) 4058 // A constructor we wouldn't select can't be "involved in initializing" 4059 // anything. 4060 return true; 4061 return SMOR->getMethod()->isConstexpr(); 4062} 4063 4064/// Determine whether the specified special member function would be constexpr 4065/// if it were implicitly defined. 4066static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4067 Sema::CXXSpecialMember CSM, 4068 bool ConstArg) { 4069 if (!S.getLangOpts().CPlusPlus11) 4070 return false; 4071 4072 // C++11 [dcl.constexpr]p4: 4073 // In the definition of a constexpr constructor [...] 4074 switch (CSM) { 4075 case Sema::CXXDefaultConstructor: 4076 // Since default constructor lookup is essentially trivial (and cannot 4077 // involve, for instance, template instantiation), we compute whether a 4078 // defaulted default constructor is constexpr directly within CXXRecordDecl. 4079 // 4080 // This is important for performance; we need to know whether the default 4081 // constructor is constexpr to determine whether the type is a literal type. 4082 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 4083 4084 case Sema::CXXCopyConstructor: 4085 case Sema::CXXMoveConstructor: 4086 // For copy or move constructors, we need to perform overload resolution. 4087 break; 4088 4089 case Sema::CXXCopyAssignment: 4090 case Sema::CXXMoveAssignment: 4091 case Sema::CXXDestructor: 4092 case Sema::CXXInvalid: 4093 return false; 4094 } 4095 4096 // -- if the class is a non-empty union, or for each non-empty anonymous 4097 // union member of a non-union class, exactly one non-static data member 4098 // shall be initialized; [DR1359] 4099 // 4100 // If we squint, this is guaranteed, since exactly one non-static data member 4101 // will be initialized (if the constructor isn't deleted), we just don't know 4102 // which one. 4103 if (ClassDecl->isUnion()) 4104 return true; 4105 4106 // -- the class shall not have any virtual base classes; 4107 if (ClassDecl->getNumVBases()) 4108 return false; 4109 4110 // -- every constructor involved in initializing [...] base class 4111 // sub-objects shall be a constexpr constructor; 4112 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4113 BEnd = ClassDecl->bases_end(); 4114 B != BEnd; ++B) { 4115 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 4116 if (!BaseType) continue; 4117 4118 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4119 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 4120 return false; 4121 } 4122 4123 // -- every constructor involved in initializing non-static data members 4124 // [...] shall be a constexpr constructor; 4125 // -- every non-static data member and base class sub-object shall be 4126 // initialized 4127 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4128 FEnd = ClassDecl->field_end(); 4129 F != FEnd; ++F) { 4130 if (F->isInvalidDecl()) 4131 continue; 4132 if (const RecordType *RecordTy = 4133 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4134 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4135 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 4136 return false; 4137 } 4138 } 4139 4140 // All OK, it's constexpr! 4141 return true; 4142} 4143 4144static Sema::ImplicitExceptionSpecification 4145computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 4146 switch (S.getSpecialMember(MD)) { 4147 case Sema::CXXDefaultConstructor: 4148 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 4149 case Sema::CXXCopyConstructor: 4150 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 4151 case Sema::CXXCopyAssignment: 4152 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 4153 case Sema::CXXMoveConstructor: 4154 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 4155 case Sema::CXXMoveAssignment: 4156 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 4157 case Sema::CXXDestructor: 4158 return S.ComputeDefaultedDtorExceptionSpec(MD); 4159 case Sema::CXXInvalid: 4160 break; 4161 } 4162 llvm_unreachable("only special members have implicit exception specs"); 4163} 4164 4165static void 4166updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4167 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4168 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4169 ExceptSpec.getEPI(EPI); 4170 const FunctionProtoType *NewFPT = cast<FunctionProtoType>( 4171 S.Context.getFunctionType(FPT->getResultType(), FPT->arg_type_begin(), 4172 FPT->getNumArgs(), EPI)); 4173 FD->setType(QualType(NewFPT, 0)); 4174} 4175 4176void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4177 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4178 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4179 return; 4180 4181 // Evaluate the exception specification. 4182 ImplicitExceptionSpecification ExceptSpec = 4183 computeImplicitExceptionSpec(*this, Loc, MD); 4184 4185 // Update the type of the special member to use it. 4186 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4187 4188 // A user-provided destructor can be defined outside the class. When that 4189 // happens, be sure to update the exception specification on both 4190 // declarations. 4191 const FunctionProtoType *CanonicalFPT = 4192 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4193 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4194 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4195 CanonicalFPT, ExceptSpec); 4196} 4197 4198void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4199 CXXRecordDecl *RD = MD->getParent(); 4200 CXXSpecialMember CSM = getSpecialMember(MD); 4201 4202 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4203 "not an explicitly-defaulted special member"); 4204 4205 // Whether this was the first-declared instance of the constructor. 4206 // This affects whether we implicitly add an exception spec and constexpr. 4207 bool First = MD == MD->getCanonicalDecl(); 4208 4209 bool HadError = false; 4210 4211 // C++11 [dcl.fct.def.default]p1: 4212 // A function that is explicitly defaulted shall 4213 // -- be a special member function (checked elsewhere), 4214 // -- have the same type (except for ref-qualifiers, and except that a 4215 // copy operation can take a non-const reference) as an implicit 4216 // declaration, and 4217 // -- not have default arguments. 4218 unsigned ExpectedParams = 1; 4219 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4220 ExpectedParams = 0; 4221 if (MD->getNumParams() != ExpectedParams) { 4222 // This also checks for default arguments: a copy or move constructor with a 4223 // default argument is classified as a default constructor, and assignment 4224 // operations and destructors can't have default arguments. 4225 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4226 << CSM << MD->getSourceRange(); 4227 HadError = true; 4228 } else if (MD->isVariadic()) { 4229 Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic) 4230 << CSM << MD->getSourceRange(); 4231 HadError = true; 4232 } 4233 4234 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4235 4236 bool CanHaveConstParam = false; 4237 if (CSM == CXXCopyConstructor) 4238 CanHaveConstParam = RD->implicitCopyConstructorHasConstParam(); 4239 else if (CSM == CXXCopyAssignment) 4240 CanHaveConstParam = RD->implicitCopyAssignmentHasConstParam(); 4241 4242 QualType ReturnType = Context.VoidTy; 4243 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4244 // Check for return type matching. 4245 ReturnType = Type->getResultType(); 4246 QualType ExpectedReturnType = 4247 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4248 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4249 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4250 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4251 HadError = true; 4252 } 4253 4254 // A defaulted special member cannot have cv-qualifiers. 4255 if (Type->getTypeQuals()) { 4256 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4257 << (CSM == CXXMoveAssignment); 4258 HadError = true; 4259 } 4260 } 4261 4262 // Check for parameter type matching. 4263 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4264 bool HasConstParam = false; 4265 if (ExpectedParams && ArgType->isReferenceType()) { 4266 // Argument must be reference to possibly-const T. 4267 QualType ReferentType = ArgType->getPointeeType(); 4268 HasConstParam = ReferentType.isConstQualified(); 4269 4270 if (ReferentType.isVolatileQualified()) { 4271 Diag(MD->getLocation(), 4272 diag::err_defaulted_special_member_volatile_param) << CSM; 4273 HadError = true; 4274 } 4275 4276 if (HasConstParam && !CanHaveConstParam) { 4277 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4278 Diag(MD->getLocation(), 4279 diag::err_defaulted_special_member_copy_const_param) 4280 << (CSM == CXXCopyAssignment); 4281 // FIXME: Explain why this special member can't be const. 4282 } else { 4283 Diag(MD->getLocation(), 4284 diag::err_defaulted_special_member_move_const_param) 4285 << (CSM == CXXMoveAssignment); 4286 } 4287 HadError = true; 4288 } 4289 } else if (ExpectedParams) { 4290 // A copy assignment operator can take its argument by value, but a 4291 // defaulted one cannot. 4292 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4293 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4294 HadError = true; 4295 } 4296 4297 // C++11 [dcl.fct.def.default]p2: 4298 // An explicitly-defaulted function may be declared constexpr only if it 4299 // would have been implicitly declared as constexpr, 4300 // Do not apply this rule to members of class templates, since core issue 1358 4301 // makes such functions always instantiate to constexpr functions. For 4302 // non-constructors, this is checked elsewhere. 4303 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4304 HasConstParam); 4305 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr && 4306 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4307 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4308 // FIXME: Explain why the constructor can't be constexpr. 4309 HadError = true; 4310 } 4311 4312 // and may have an explicit exception-specification only if it is compatible 4313 // with the exception-specification on the implicit declaration. 4314 if (Type->hasExceptionSpec()) { 4315 // Delay the check if this is the first declaration of the special member, 4316 // since we may not have parsed some necessary in-class initializers yet. 4317 if (First) 4318 DelayedDefaultedMemberExceptionSpecs.push_back(std::make_pair(MD, Type)); 4319 else 4320 CheckExplicitlyDefaultedMemberExceptionSpec(MD, Type); 4321 } 4322 4323 // If a function is explicitly defaulted on its first declaration, 4324 if (First) { 4325 // -- it is implicitly considered to be constexpr if the implicit 4326 // definition would be, 4327 MD->setConstexpr(Constexpr); 4328 4329 // -- it is implicitly considered to have the same exception-specification 4330 // as if it had been implicitly declared, 4331 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4332 EPI.ExceptionSpecType = EST_Unevaluated; 4333 EPI.ExceptionSpecDecl = MD; 4334 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 4335 ExpectedParams, EPI)); 4336 } 4337 4338 if (ShouldDeleteSpecialMember(MD, CSM)) { 4339 if (First) { 4340 MD->setDeletedAsWritten(); 4341 } else { 4342 // C++11 [dcl.fct.def.default]p4: 4343 // [For a] user-provided explicitly-defaulted function [...] if such a 4344 // function is implicitly defined as deleted, the program is ill-formed. 4345 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4346 HadError = true; 4347 } 4348 } 4349 4350 if (HadError) 4351 MD->setInvalidDecl(); 4352} 4353 4354/// Check whether the exception specification provided for an 4355/// explicitly-defaulted special member matches the exception specification 4356/// that would have been generated for an implicit special member, per 4357/// C++11 [dcl.fct.def.default]p2. 4358void Sema::CheckExplicitlyDefaultedMemberExceptionSpec( 4359 CXXMethodDecl *MD, const FunctionProtoType *SpecifiedType) { 4360 // Compute the implicit exception specification. 4361 FunctionProtoType::ExtProtoInfo EPI; 4362 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4363 const FunctionProtoType *ImplicitType = cast<FunctionProtoType>( 4364 Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4365 4366 // Ensure that it matches. 4367 CheckEquivalentExceptionSpec( 4368 PDiag(diag::err_incorrect_defaulted_exception_spec) 4369 << getSpecialMember(MD), PDiag(), 4370 ImplicitType, SourceLocation(), 4371 SpecifiedType, MD->getLocation()); 4372} 4373 4374void Sema::CheckDelayedExplicitlyDefaultedMemberExceptionSpecs() { 4375 for (unsigned I = 0, N = DelayedDefaultedMemberExceptionSpecs.size(); 4376 I != N; ++I) 4377 CheckExplicitlyDefaultedMemberExceptionSpec( 4378 DelayedDefaultedMemberExceptionSpecs[I].first, 4379 DelayedDefaultedMemberExceptionSpecs[I].second); 4380 4381 DelayedDefaultedMemberExceptionSpecs.clear(); 4382} 4383 4384namespace { 4385struct SpecialMemberDeletionInfo { 4386 Sema &S; 4387 CXXMethodDecl *MD; 4388 Sema::CXXSpecialMember CSM; 4389 bool Diagnose; 4390 4391 // Properties of the special member, computed for convenience. 4392 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4393 SourceLocation Loc; 4394 4395 bool AllFieldsAreConst; 4396 4397 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4398 Sema::CXXSpecialMember CSM, bool Diagnose) 4399 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4400 IsConstructor(false), IsAssignment(false), IsMove(false), 4401 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4402 AllFieldsAreConst(true) { 4403 switch (CSM) { 4404 case Sema::CXXDefaultConstructor: 4405 case Sema::CXXCopyConstructor: 4406 IsConstructor = true; 4407 break; 4408 case Sema::CXXMoveConstructor: 4409 IsConstructor = true; 4410 IsMove = true; 4411 break; 4412 case Sema::CXXCopyAssignment: 4413 IsAssignment = true; 4414 break; 4415 case Sema::CXXMoveAssignment: 4416 IsAssignment = true; 4417 IsMove = true; 4418 break; 4419 case Sema::CXXDestructor: 4420 break; 4421 case Sema::CXXInvalid: 4422 llvm_unreachable("invalid special member kind"); 4423 } 4424 4425 if (MD->getNumParams()) { 4426 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4427 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4428 } 4429 } 4430 4431 bool inUnion() const { return MD->getParent()->isUnion(); } 4432 4433 /// Look up the corresponding special member in the given class. 4434 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4435 unsigned Quals) { 4436 unsigned TQ = MD->getTypeQualifiers(); 4437 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4438 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4439 Quals = 0; 4440 return S.LookupSpecialMember(Class, CSM, 4441 ConstArg || (Quals & Qualifiers::Const), 4442 VolatileArg || (Quals & Qualifiers::Volatile), 4443 MD->getRefQualifier() == RQ_RValue, 4444 TQ & Qualifiers::Const, 4445 TQ & Qualifiers::Volatile); 4446 } 4447 4448 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4449 4450 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4451 bool shouldDeleteForField(FieldDecl *FD); 4452 bool shouldDeleteForAllConstMembers(); 4453 4454 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4455 unsigned Quals); 4456 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4457 Sema::SpecialMemberOverloadResult *SMOR, 4458 bool IsDtorCallInCtor); 4459 4460 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4461}; 4462} 4463 4464/// Is the given special member inaccessible when used on the given 4465/// sub-object. 4466bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4467 CXXMethodDecl *target) { 4468 /// If we're operating on a base class, the object type is the 4469 /// type of this special member. 4470 QualType objectTy; 4471 AccessSpecifier access = target->getAccess(); 4472 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4473 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4474 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4475 4476 // If we're operating on a field, the object type is the type of the field. 4477 } else { 4478 objectTy = S.Context.getTypeDeclType(target->getParent()); 4479 } 4480 4481 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4482} 4483 4484/// Check whether we should delete a special member due to the implicit 4485/// definition containing a call to a special member of a subobject. 4486bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4487 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4488 bool IsDtorCallInCtor) { 4489 CXXMethodDecl *Decl = SMOR->getMethod(); 4490 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4491 4492 int DiagKind = -1; 4493 4494 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4495 DiagKind = !Decl ? 0 : 1; 4496 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4497 DiagKind = 2; 4498 else if (!isAccessible(Subobj, Decl)) 4499 DiagKind = 3; 4500 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4501 !Decl->isTrivial()) { 4502 // A member of a union must have a trivial corresponding special member. 4503 // As a weird special case, a destructor call from a union's constructor 4504 // must be accessible and non-deleted, but need not be trivial. Such a 4505 // destructor is never actually called, but is semantically checked as 4506 // if it were. 4507 DiagKind = 4; 4508 } 4509 4510 if (DiagKind == -1) 4511 return false; 4512 4513 if (Diagnose) { 4514 if (Field) { 4515 S.Diag(Field->getLocation(), 4516 diag::note_deleted_special_member_class_subobject) 4517 << CSM << MD->getParent() << /*IsField*/true 4518 << Field << DiagKind << IsDtorCallInCtor; 4519 } else { 4520 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4521 S.Diag(Base->getLocStart(), 4522 diag::note_deleted_special_member_class_subobject) 4523 << CSM << MD->getParent() << /*IsField*/false 4524 << Base->getType() << DiagKind << IsDtorCallInCtor; 4525 } 4526 4527 if (DiagKind == 1) 4528 S.NoteDeletedFunction(Decl); 4529 // FIXME: Explain inaccessibility if DiagKind == 3. 4530 } 4531 4532 return true; 4533} 4534 4535/// Check whether we should delete a special member function due to having a 4536/// direct or virtual base class or non-static data member of class type M. 4537bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4538 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 4539 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4540 4541 // C++11 [class.ctor]p5: 4542 // -- any direct or virtual base class, or non-static data member with no 4543 // brace-or-equal-initializer, has class type M (or array thereof) and 4544 // either M has no default constructor or overload resolution as applied 4545 // to M's default constructor results in an ambiguity or in a function 4546 // that is deleted or inaccessible 4547 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4548 // -- a direct or virtual base class B that cannot be copied/moved because 4549 // overload resolution, as applied to B's corresponding special member, 4550 // results in an ambiguity or a function that is deleted or inaccessible 4551 // from the defaulted special member 4552 // C++11 [class.dtor]p5: 4553 // -- any direct or virtual base class [...] has a type with a destructor 4554 // that is deleted or inaccessible 4555 if (!(CSM == Sema::CXXDefaultConstructor && 4556 Field && Field->hasInClassInitializer()) && 4557 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 4558 return true; 4559 4560 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4561 // -- any direct or virtual base class or non-static data member has a 4562 // type with a destructor that is deleted or inaccessible 4563 if (IsConstructor) { 4564 Sema::SpecialMemberOverloadResult *SMOR = 4565 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4566 false, false, false, false, false); 4567 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4568 return true; 4569 } 4570 4571 return false; 4572} 4573 4574/// Check whether we should delete a special member function due to the class 4575/// having a particular direct or virtual base class. 4576bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4577 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4578 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 4579} 4580 4581/// Check whether we should delete a special member function due to the class 4582/// having a particular non-static data member. 4583bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4584 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4585 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4586 4587 if (CSM == Sema::CXXDefaultConstructor) { 4588 // For a default constructor, all references must be initialized in-class 4589 // and, if a union, it must have a non-const member. 4590 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4591 if (Diagnose) 4592 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4593 << MD->getParent() << FD << FieldType << /*Reference*/0; 4594 return true; 4595 } 4596 // C++11 [class.ctor]p5: any non-variant non-static data member of 4597 // const-qualified type (or array thereof) with no 4598 // brace-or-equal-initializer does not have a user-provided default 4599 // constructor. 4600 if (!inUnion() && FieldType.isConstQualified() && 4601 !FD->hasInClassInitializer() && 4602 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4603 if (Diagnose) 4604 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4605 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4606 return true; 4607 } 4608 4609 if (inUnion() && !FieldType.isConstQualified()) 4610 AllFieldsAreConst = false; 4611 } else if (CSM == Sema::CXXCopyConstructor) { 4612 // For a copy constructor, data members must not be of rvalue reference 4613 // type. 4614 if (FieldType->isRValueReferenceType()) { 4615 if (Diagnose) 4616 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4617 << MD->getParent() << FD << FieldType; 4618 return true; 4619 } 4620 } else if (IsAssignment) { 4621 // For an assignment operator, data members must not be of reference type. 4622 if (FieldType->isReferenceType()) { 4623 if (Diagnose) 4624 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4625 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4626 return true; 4627 } 4628 if (!FieldRecord && FieldType.isConstQualified()) { 4629 // C++11 [class.copy]p23: 4630 // -- a non-static data member of const non-class type (or array thereof) 4631 if (Diagnose) 4632 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4633 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4634 return true; 4635 } 4636 } 4637 4638 if (FieldRecord) { 4639 // Some additional restrictions exist on the variant members. 4640 if (!inUnion() && FieldRecord->isUnion() && 4641 FieldRecord->isAnonymousStructOrUnion()) { 4642 bool AllVariantFieldsAreConst = true; 4643 4644 // FIXME: Handle anonymous unions declared within anonymous unions. 4645 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4646 UE = FieldRecord->field_end(); 4647 UI != UE; ++UI) { 4648 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4649 4650 if (!UnionFieldType.isConstQualified()) 4651 AllVariantFieldsAreConst = false; 4652 4653 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4654 if (UnionFieldRecord && 4655 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 4656 UnionFieldType.getCVRQualifiers())) 4657 return true; 4658 } 4659 4660 // At least one member in each anonymous union must be non-const 4661 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4662 FieldRecord->field_begin() != FieldRecord->field_end()) { 4663 if (Diagnose) 4664 S.Diag(FieldRecord->getLocation(), 4665 diag::note_deleted_default_ctor_all_const) 4666 << MD->getParent() << /*anonymous union*/1; 4667 return true; 4668 } 4669 4670 // Don't check the implicit member of the anonymous union type. 4671 // This is technically non-conformant, but sanity demands it. 4672 return false; 4673 } 4674 4675 if (shouldDeleteForClassSubobject(FieldRecord, FD, 4676 FieldType.getCVRQualifiers())) 4677 return true; 4678 } 4679 4680 return false; 4681} 4682 4683/// C++11 [class.ctor] p5: 4684/// A defaulted default constructor for a class X is defined as deleted if 4685/// X is a union and all of its variant members are of const-qualified type. 4686bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4687 // This is a silly definition, because it gives an empty union a deleted 4688 // default constructor. Don't do that. 4689 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4690 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4691 if (Diagnose) 4692 S.Diag(MD->getParent()->getLocation(), 4693 diag::note_deleted_default_ctor_all_const) 4694 << MD->getParent() << /*not anonymous union*/0; 4695 return true; 4696 } 4697 return false; 4698} 4699 4700/// Determine whether a defaulted special member function should be defined as 4701/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4702/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4703bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4704 bool Diagnose) { 4705 if (MD->isInvalidDecl()) 4706 return false; 4707 CXXRecordDecl *RD = MD->getParent(); 4708 assert(!RD->isDependentType() && "do deletion after instantiation"); 4709 if (!LangOpts.CPlusPlus11 || RD->isInvalidDecl()) 4710 return false; 4711 4712 // C++11 [expr.lambda.prim]p19: 4713 // The closure type associated with a lambda-expression has a 4714 // deleted (8.4.3) default constructor and a deleted copy 4715 // assignment operator. 4716 if (RD->isLambda() && 4717 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4718 if (Diagnose) 4719 Diag(RD->getLocation(), diag::note_lambda_decl); 4720 return true; 4721 } 4722 4723 // For an anonymous struct or union, the copy and assignment special members 4724 // will never be used, so skip the check. For an anonymous union declared at 4725 // namespace scope, the constructor and destructor are used. 4726 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4727 RD->isAnonymousStructOrUnion()) 4728 return false; 4729 4730 // C++11 [class.copy]p7, p18: 4731 // If the class definition declares a move constructor or move assignment 4732 // operator, an implicitly declared copy constructor or copy assignment 4733 // operator is defined as deleted. 4734 if (MD->isImplicit() && 4735 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4736 CXXMethodDecl *UserDeclaredMove = 0; 4737 4738 // In Microsoft mode, a user-declared move only causes the deletion of the 4739 // corresponding copy operation, not both copy operations. 4740 if (RD->hasUserDeclaredMoveConstructor() && 4741 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4742 if (!Diagnose) return true; 4743 4744 // Find any user-declared move constructor. 4745 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(), 4746 E = RD->ctor_end(); I != E; ++I) { 4747 if (I->isMoveConstructor()) { 4748 UserDeclaredMove = *I; 4749 break; 4750 } 4751 } 4752 assert(UserDeclaredMove); 4753 } else if (RD->hasUserDeclaredMoveAssignment() && 4754 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4755 if (!Diagnose) return true; 4756 4757 // Find any user-declared move assignment operator. 4758 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 4759 E = RD->method_end(); I != E; ++I) { 4760 if (I->isMoveAssignmentOperator()) { 4761 UserDeclaredMove = *I; 4762 break; 4763 } 4764 } 4765 assert(UserDeclaredMove); 4766 } 4767 4768 if (UserDeclaredMove) { 4769 Diag(UserDeclaredMove->getLocation(), 4770 diag::note_deleted_copy_user_declared_move) 4771 << (CSM == CXXCopyAssignment) << RD 4772 << UserDeclaredMove->isMoveAssignmentOperator(); 4773 return true; 4774 } 4775 } 4776 4777 // Do access control from the special member function 4778 ContextRAII MethodContext(*this, MD); 4779 4780 // C++11 [class.dtor]p5: 4781 // -- for a virtual destructor, lookup of the non-array deallocation function 4782 // results in an ambiguity or in a function that is deleted or inaccessible 4783 if (CSM == CXXDestructor && MD->isVirtual()) { 4784 FunctionDecl *OperatorDelete = 0; 4785 DeclarationName Name = 4786 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4787 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4788 OperatorDelete, false)) { 4789 if (Diagnose) 4790 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4791 return true; 4792 } 4793 } 4794 4795 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4796 4797 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4798 BE = RD->bases_end(); BI != BE; ++BI) 4799 if (!BI->isVirtual() && 4800 SMI.shouldDeleteForBase(BI)) 4801 return true; 4802 4803 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4804 BE = RD->vbases_end(); BI != BE; ++BI) 4805 if (SMI.shouldDeleteForBase(BI)) 4806 return true; 4807 4808 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4809 FE = RD->field_end(); FI != FE; ++FI) 4810 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4811 SMI.shouldDeleteForField(*FI)) 4812 return true; 4813 4814 if (SMI.shouldDeleteForAllConstMembers()) 4815 return true; 4816 4817 return false; 4818} 4819 4820/// Perform lookup for a special member of the specified kind, and determine 4821/// whether it is trivial. If the triviality can be determined without the 4822/// lookup, skip it. This is intended for use when determining whether a 4823/// special member of a containing object is trivial, and thus does not ever 4824/// perform overload resolution for default constructors. 4825/// 4826/// If \p Selected is not \c NULL, \c *Selected will be filled in with the 4827/// member that was most likely to be intended to be trivial, if any. 4828static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD, 4829 Sema::CXXSpecialMember CSM, unsigned Quals, 4830 CXXMethodDecl **Selected) { 4831 if (Selected) 4832 *Selected = 0; 4833 4834 switch (CSM) { 4835 case Sema::CXXInvalid: 4836 llvm_unreachable("not a special member"); 4837 4838 case Sema::CXXDefaultConstructor: 4839 // C++11 [class.ctor]p5: 4840 // A default constructor is trivial if: 4841 // - all the [direct subobjects] have trivial default constructors 4842 // 4843 // Note, no overload resolution is performed in this case. 4844 if (RD->hasTrivialDefaultConstructor()) 4845 return true; 4846 4847 if (Selected) { 4848 // If there's a default constructor which could have been trivial, dig it 4849 // out. Otherwise, if there's any user-provided default constructor, point 4850 // to that as an example of why there's not a trivial one. 4851 CXXConstructorDecl *DefCtor = 0; 4852 if (RD->needsImplicitDefaultConstructor()) 4853 S.DeclareImplicitDefaultConstructor(RD); 4854 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), 4855 CE = RD->ctor_end(); CI != CE; ++CI) { 4856 if (!CI->isDefaultConstructor()) 4857 continue; 4858 DefCtor = *CI; 4859 if (!DefCtor->isUserProvided()) 4860 break; 4861 } 4862 4863 *Selected = DefCtor; 4864 } 4865 4866 return false; 4867 4868 case Sema::CXXDestructor: 4869 // C++11 [class.dtor]p5: 4870 // A destructor is trivial if: 4871 // - all the direct [subobjects] have trivial destructors 4872 if (RD->hasTrivialDestructor()) 4873 return true; 4874 4875 if (Selected) { 4876 if (RD->needsImplicitDestructor()) 4877 S.DeclareImplicitDestructor(RD); 4878 *Selected = RD->getDestructor(); 4879 } 4880 4881 return false; 4882 4883 case Sema::CXXCopyConstructor: 4884 // C++11 [class.copy]p12: 4885 // A copy constructor is trivial if: 4886 // - the constructor selected to copy each direct [subobject] is trivial 4887 if (RD->hasTrivialCopyConstructor()) { 4888 if (Quals == Qualifiers::Const) 4889 // We must either select the trivial copy constructor or reach an 4890 // ambiguity; no need to actually perform overload resolution. 4891 return true; 4892 } else if (!Selected) { 4893 return false; 4894 } 4895 // In C++98, we are not supposed to perform overload resolution here, but we 4896 // treat that as a language defect, as suggested on cxx-abi-dev, to treat 4897 // cases like B as having a non-trivial copy constructor: 4898 // struct A { template<typename T> A(T&); }; 4899 // struct B { mutable A a; }; 4900 goto NeedOverloadResolution; 4901 4902 case Sema::CXXCopyAssignment: 4903 // C++11 [class.copy]p25: 4904 // A copy assignment operator is trivial if: 4905 // - the assignment operator selected to copy each direct [subobject] is 4906 // trivial 4907 if (RD->hasTrivialCopyAssignment()) { 4908 if (Quals == Qualifiers::Const) 4909 return true; 4910 } else if (!Selected) { 4911 return false; 4912 } 4913 // In C++98, we are not supposed to perform overload resolution here, but we 4914 // treat that as a language defect. 4915 goto NeedOverloadResolution; 4916 4917 case Sema::CXXMoveConstructor: 4918 case Sema::CXXMoveAssignment: 4919 NeedOverloadResolution: 4920 Sema::SpecialMemberOverloadResult *SMOR = 4921 S.LookupSpecialMember(RD, CSM, 4922 Quals & Qualifiers::Const, 4923 Quals & Qualifiers::Volatile, 4924 /*RValueThis*/false, /*ConstThis*/false, 4925 /*VolatileThis*/false); 4926 4927 // The standard doesn't describe how to behave if the lookup is ambiguous. 4928 // We treat it as not making the member non-trivial, just like the standard 4929 // mandates for the default constructor. This should rarely matter, because 4930 // the member will also be deleted. 4931 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4932 return true; 4933 4934 if (!SMOR->getMethod()) { 4935 assert(SMOR->getKind() == 4936 Sema::SpecialMemberOverloadResult::NoMemberOrDeleted); 4937 return false; 4938 } 4939 4940 // We deliberately don't check if we found a deleted special member. We're 4941 // not supposed to! 4942 if (Selected) 4943 *Selected = SMOR->getMethod(); 4944 return SMOR->getMethod()->isTrivial(); 4945 } 4946 4947 llvm_unreachable("unknown special method kind"); 4948} 4949 4950CXXConstructorDecl *findUserDeclaredCtor(CXXRecordDecl *RD) { 4951 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), CE = RD->ctor_end(); 4952 CI != CE; ++CI) 4953 if (!CI->isImplicit()) 4954 return *CI; 4955 4956 // Look for constructor templates. 4957 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> tmpl_iter; 4958 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); TI != TE; ++TI) { 4959 if (CXXConstructorDecl *CD = 4960 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl())) 4961 return CD; 4962 } 4963 4964 return 0; 4965} 4966 4967/// The kind of subobject we are checking for triviality. The values of this 4968/// enumeration are used in diagnostics. 4969enum TrivialSubobjectKind { 4970 /// The subobject is a base class. 4971 TSK_BaseClass, 4972 /// The subobject is a non-static data member. 4973 TSK_Field, 4974 /// The object is actually the complete object. 4975 TSK_CompleteObject 4976}; 4977 4978/// Check whether the special member selected for a given type would be trivial. 4979static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc, 4980 QualType SubType, 4981 Sema::CXXSpecialMember CSM, 4982 TrivialSubobjectKind Kind, 4983 bool Diagnose) { 4984 CXXRecordDecl *SubRD = SubType->getAsCXXRecordDecl(); 4985 if (!SubRD) 4986 return true; 4987 4988 CXXMethodDecl *Selected; 4989 if (findTrivialSpecialMember(S, SubRD, CSM, SubType.getCVRQualifiers(), 4990 Diagnose ? &Selected : 0)) 4991 return true; 4992 4993 if (Diagnose) { 4994 if (!Selected && CSM == Sema::CXXDefaultConstructor) { 4995 S.Diag(SubobjLoc, diag::note_nontrivial_no_def_ctor) 4996 << Kind << SubType.getUnqualifiedType(); 4997 if (CXXConstructorDecl *CD = findUserDeclaredCtor(SubRD)) 4998 S.Diag(CD->getLocation(), diag::note_user_declared_ctor); 4999 } else if (!Selected) 5000 S.Diag(SubobjLoc, diag::note_nontrivial_no_copy) 5001 << Kind << SubType.getUnqualifiedType() << CSM << SubType; 5002 else if (Selected->isUserProvided()) { 5003 if (Kind == TSK_CompleteObject) 5004 S.Diag(Selected->getLocation(), diag::note_nontrivial_user_provided) 5005 << Kind << SubType.getUnqualifiedType() << CSM; 5006 else { 5007 S.Diag(SubobjLoc, diag::note_nontrivial_user_provided) 5008 << Kind << SubType.getUnqualifiedType() << CSM; 5009 S.Diag(Selected->getLocation(), diag::note_declared_at); 5010 } 5011 } else { 5012 if (Kind != TSK_CompleteObject) 5013 S.Diag(SubobjLoc, diag::note_nontrivial_subobject) 5014 << Kind << SubType.getUnqualifiedType() << CSM; 5015 5016 // Explain why the defaulted or deleted special member isn't trivial. 5017 S.SpecialMemberIsTrivial(Selected, CSM, Diagnose); 5018 } 5019 } 5020 5021 return false; 5022} 5023 5024/// Check whether the members of a class type allow a special member to be 5025/// trivial. 5026static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD, 5027 Sema::CXXSpecialMember CSM, 5028 bool ConstArg, bool Diagnose) { 5029 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 5030 FE = RD->field_end(); FI != FE; ++FI) { 5031 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 5032 continue; 5033 5034 QualType FieldType = S.Context.getBaseElementType(FI->getType()); 5035 5036 // Pretend anonymous struct or union members are members of this class. 5037 if (FI->isAnonymousStructOrUnion()) { 5038 if (!checkTrivialClassMembers(S, FieldType->getAsCXXRecordDecl(), 5039 CSM, ConstArg, Diagnose)) 5040 return false; 5041 continue; 5042 } 5043 5044 // C++11 [class.ctor]p5: 5045 // A default constructor is trivial if [...] 5046 // -- no non-static data member of its class has a 5047 // brace-or-equal-initializer 5048 if (CSM == Sema::CXXDefaultConstructor && FI->hasInClassInitializer()) { 5049 if (Diagnose) 5050 S.Diag(FI->getLocation(), diag::note_nontrivial_in_class_init) << *FI; 5051 return false; 5052 } 5053 5054 // Objective C ARC 4.3.5: 5055 // [...] nontrivally ownership-qualified types are [...] not trivially 5056 // default constructible, copy constructible, move constructible, copy 5057 // assignable, move assignable, or destructible [...] 5058 if (S.getLangOpts().ObjCAutoRefCount && 5059 FieldType.hasNonTrivialObjCLifetime()) { 5060 if (Diagnose) 5061 S.Diag(FI->getLocation(), diag::note_nontrivial_objc_ownership) 5062 << RD << FieldType.getObjCLifetime(); 5063 return false; 5064 } 5065 5066 if (ConstArg && !FI->isMutable()) 5067 FieldType.addConst(); 5068 if (!checkTrivialSubobjectCall(S, FI->getLocation(), FieldType, CSM, 5069 TSK_Field, Diagnose)) 5070 return false; 5071 } 5072 5073 return true; 5074} 5075 5076/// Diagnose why the specified class does not have a trivial special member of 5077/// the given kind. 5078void Sema::DiagnoseNontrivial(const CXXRecordDecl *RD, CXXSpecialMember CSM) { 5079 QualType Ty = Context.getRecordType(RD); 5080 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) 5081 Ty.addConst(); 5082 5083 checkTrivialSubobjectCall(*this, RD->getLocation(), Ty, CSM, 5084 TSK_CompleteObject, /*Diagnose*/true); 5085} 5086 5087/// Determine whether a defaulted or deleted special member function is trivial, 5088/// as specified in C++11 [class.ctor]p5, C++11 [class.copy]p12, 5089/// C++11 [class.copy]p25, and C++11 [class.dtor]p5. 5090bool Sema::SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM, 5091 bool Diagnose) { 5092 assert(!MD->isUserProvided() && CSM != CXXInvalid && "not special enough"); 5093 5094 CXXRecordDecl *RD = MD->getParent(); 5095 5096 bool ConstArg = false; 5097 ParmVarDecl *Param0 = MD->getNumParams() ? MD->getParamDecl(0) : 0; 5098 5099 // C++11 [class.copy]p12, p25: 5100 // A [special member] is trivial if its declared parameter type is the same 5101 // as if it had been implicitly declared [...] 5102 switch (CSM) { 5103 case CXXDefaultConstructor: 5104 case CXXDestructor: 5105 // Trivial default constructors and destructors cannot have parameters. 5106 break; 5107 5108 case CXXCopyConstructor: 5109 case CXXCopyAssignment: { 5110 // Trivial copy operations always have const, non-volatile parameter types. 5111 ConstArg = true; 5112 const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>(); 5113 if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) { 5114 if (Diagnose) 5115 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5116 << Param0->getSourceRange() << Param0->getType() 5117 << Context.getLValueReferenceType( 5118 Context.getRecordType(RD).withConst()); 5119 return false; 5120 } 5121 break; 5122 } 5123 5124 case CXXMoveConstructor: 5125 case CXXMoveAssignment: { 5126 // Trivial move operations always have non-cv-qualified parameters. 5127 const RValueReferenceType *RT = 5128 Param0->getType()->getAs<RValueReferenceType>(); 5129 if (!RT || RT->getPointeeType().getCVRQualifiers()) { 5130 if (Diagnose) 5131 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5132 << Param0->getSourceRange() << Param0->getType() 5133 << Context.getRValueReferenceType(Context.getRecordType(RD)); 5134 return false; 5135 } 5136 break; 5137 } 5138 5139 case CXXInvalid: 5140 llvm_unreachable("not a special member"); 5141 } 5142 5143 // FIXME: We require that the parameter-declaration-clause is equivalent to 5144 // that of an implicit declaration, not just that the declared parameter type 5145 // matches, in order to prevent absuridities like a function simultaneously 5146 // being a trivial copy constructor and a non-trivial default constructor. 5147 // This issue has not yet been assigned a core issue number. 5148 if (MD->getMinRequiredArguments() < MD->getNumParams()) { 5149 if (Diagnose) 5150 Diag(MD->getParamDecl(MD->getMinRequiredArguments())->getLocation(), 5151 diag::note_nontrivial_default_arg) 5152 << MD->getParamDecl(MD->getMinRequiredArguments())->getSourceRange(); 5153 return false; 5154 } 5155 if (MD->isVariadic()) { 5156 if (Diagnose) 5157 Diag(MD->getLocation(), diag::note_nontrivial_variadic); 5158 return false; 5159 } 5160 5161 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5162 // A copy/move [constructor or assignment operator] is trivial if 5163 // -- the [member] selected to copy/move each direct base class subobject 5164 // is trivial 5165 // 5166 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5167 // A [default constructor or destructor] is trivial if 5168 // -- all the direct base classes have trivial [default constructors or 5169 // destructors] 5170 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 5171 BE = RD->bases_end(); BI != BE; ++BI) 5172 if (!checkTrivialSubobjectCall(*this, BI->getLocStart(), 5173 ConstArg ? BI->getType().withConst() 5174 : BI->getType(), 5175 CSM, TSK_BaseClass, Diagnose)) 5176 return false; 5177 5178 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5179 // A copy/move [constructor or assignment operator] for a class X is 5180 // trivial if 5181 // -- for each non-static data member of X that is of class type (or array 5182 // thereof), the constructor selected to copy/move that member is 5183 // trivial 5184 // 5185 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5186 // A [default constructor or destructor] is trivial if 5187 // -- for all of the non-static data members of its class that are of class 5188 // type (or array thereof), each such class has a trivial [default 5189 // constructor or destructor] 5190 if (!checkTrivialClassMembers(*this, RD, CSM, ConstArg, Diagnose)) 5191 return false; 5192 5193 // C++11 [class.dtor]p5: 5194 // A destructor is trivial if [...] 5195 // -- the destructor is not virtual 5196 if (CSM == CXXDestructor && MD->isVirtual()) { 5197 if (Diagnose) 5198 Diag(MD->getLocation(), diag::note_nontrivial_virtual_dtor) << RD; 5199 return false; 5200 } 5201 5202 // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25: 5203 // A [special member] for class X is trivial if [...] 5204 // -- class X has no virtual functions and no virtual base classes 5205 if (CSM != CXXDestructor && MD->getParent()->isDynamicClass()) { 5206 if (!Diagnose) 5207 return false; 5208 5209 if (RD->getNumVBases()) { 5210 // Check for virtual bases. We already know that the corresponding 5211 // member in all bases is trivial, so vbases must all be direct. 5212 CXXBaseSpecifier &BS = *RD->vbases_begin(); 5213 assert(BS.isVirtual()); 5214 Diag(BS.getLocStart(), diag::note_nontrivial_has_virtual) << RD << 1; 5215 return false; 5216 } 5217 5218 // Must have a virtual method. 5219 for (CXXRecordDecl::method_iterator MI = RD->method_begin(), 5220 ME = RD->method_end(); MI != ME; ++MI) { 5221 if (MI->isVirtual()) { 5222 SourceLocation MLoc = MI->getLocStart(); 5223 Diag(MLoc, diag::note_nontrivial_has_virtual) << RD << 0; 5224 return false; 5225 } 5226 } 5227 5228 llvm_unreachable("dynamic class with no vbases and no virtual functions"); 5229 } 5230 5231 // Looks like it's trivial! 5232 return true; 5233} 5234 5235/// \brief Data used with FindHiddenVirtualMethod 5236namespace { 5237 struct FindHiddenVirtualMethodData { 5238 Sema *S; 5239 CXXMethodDecl *Method; 5240 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 5241 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 5242 }; 5243} 5244 5245/// \brief Check whether any most overriden method from MD in Methods 5246static bool CheckMostOverridenMethods(const CXXMethodDecl *MD, 5247 const llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5248 if (MD->size_overridden_methods() == 0) 5249 return Methods.count(MD->getCanonicalDecl()); 5250 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5251 E = MD->end_overridden_methods(); 5252 I != E; ++I) 5253 if (CheckMostOverridenMethods(*I, Methods)) 5254 return true; 5255 return false; 5256} 5257 5258/// \brief Member lookup function that determines whether a given C++ 5259/// method overloads virtual methods in a base class without overriding any, 5260/// to be used with CXXRecordDecl::lookupInBases(). 5261static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 5262 CXXBasePath &Path, 5263 void *UserData) { 5264 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 5265 5266 FindHiddenVirtualMethodData &Data 5267 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 5268 5269 DeclarationName Name = Data.Method->getDeclName(); 5270 assert(Name.getNameKind() == DeclarationName::Identifier); 5271 5272 bool foundSameNameMethod = false; 5273 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 5274 for (Path.Decls = BaseRecord->lookup(Name); 5275 !Path.Decls.empty(); 5276 Path.Decls = Path.Decls.slice(1)) { 5277 NamedDecl *D = Path.Decls.front(); 5278 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 5279 MD = MD->getCanonicalDecl(); 5280 foundSameNameMethod = true; 5281 // Interested only in hidden virtual methods. 5282 if (!MD->isVirtual()) 5283 continue; 5284 // If the method we are checking overrides a method from its base 5285 // don't warn about the other overloaded methods. 5286 if (!Data.S->IsOverload(Data.Method, MD, false)) 5287 return true; 5288 // Collect the overload only if its hidden. 5289 if (!CheckMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods)) 5290 overloadedMethods.push_back(MD); 5291 } 5292 } 5293 5294 if (foundSameNameMethod) 5295 Data.OverloadedMethods.append(overloadedMethods.begin(), 5296 overloadedMethods.end()); 5297 return foundSameNameMethod; 5298} 5299 5300/// \brief Add the most overriden methods from MD to Methods 5301static void AddMostOverridenMethods(const CXXMethodDecl *MD, 5302 llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5303 if (MD->size_overridden_methods() == 0) 5304 Methods.insert(MD->getCanonicalDecl()); 5305 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5306 E = MD->end_overridden_methods(); 5307 I != E; ++I) 5308 AddMostOverridenMethods(*I, Methods); 5309} 5310 5311/// \brief See if a method overloads virtual methods in a base class without 5312/// overriding any. 5313void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 5314 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 5315 MD->getLocation()) == DiagnosticsEngine::Ignored) 5316 return; 5317 if (!MD->getDeclName().isIdentifier()) 5318 return; 5319 5320 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 5321 /*bool RecordPaths=*/false, 5322 /*bool DetectVirtual=*/false); 5323 FindHiddenVirtualMethodData Data; 5324 Data.Method = MD; 5325 Data.S = this; 5326 5327 // Keep the base methods that were overriden or introduced in the subclass 5328 // by 'using' in a set. A base method not in this set is hidden. 5329 DeclContext::lookup_result R = DC->lookup(MD->getDeclName()); 5330 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) { 5331 NamedDecl *ND = *I; 5332 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*I)) 5333 ND = shad->getTargetDecl(); 5334 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND)) 5335 AddMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods); 5336 } 5337 5338 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 5339 !Data.OverloadedMethods.empty()) { 5340 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 5341 << MD << (Data.OverloadedMethods.size() > 1); 5342 5343 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 5344 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 5345 Diag(overloadedMD->getLocation(), 5346 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 5347 } 5348 } 5349} 5350 5351void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 5352 Decl *TagDecl, 5353 SourceLocation LBrac, 5354 SourceLocation RBrac, 5355 AttributeList *AttrList) { 5356 if (!TagDecl) 5357 return; 5358 5359 AdjustDeclIfTemplate(TagDecl); 5360 5361 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 5362 if (l->getKind() != AttributeList::AT_Visibility) 5363 continue; 5364 l->setInvalid(); 5365 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 5366 l->getName(); 5367 } 5368 5369 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 5370 // strict aliasing violation! 5371 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 5372 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 5373 5374 CheckCompletedCXXClass( 5375 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 5376} 5377 5378/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 5379/// special functions, such as the default constructor, copy 5380/// constructor, or destructor, to the given C++ class (C++ 5381/// [special]p1). This routine can only be executed just before the 5382/// definition of the class is complete. 5383void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 5384 if (!ClassDecl->hasUserDeclaredConstructor()) 5385 ++ASTContext::NumImplicitDefaultConstructors; 5386 5387 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 5388 ++ASTContext::NumImplicitCopyConstructors; 5389 5390 // If the properties or semantics of the copy constructor couldn't be 5391 // determined while the class was being declared, force a declaration 5392 // of it now. 5393 if (ClassDecl->needsOverloadResolutionForCopyConstructor()) 5394 DeclareImplicitCopyConstructor(ClassDecl); 5395 } 5396 5397 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveConstructor()) { 5398 ++ASTContext::NumImplicitMoveConstructors; 5399 5400 if (ClassDecl->needsOverloadResolutionForMoveConstructor()) 5401 DeclareImplicitMoveConstructor(ClassDecl); 5402 } 5403 5404 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 5405 ++ASTContext::NumImplicitCopyAssignmentOperators; 5406 5407 // If we have a dynamic class, then the copy assignment operator may be 5408 // virtual, so we have to declare it immediately. This ensures that, e.g., 5409 // it shows up in the right place in the vtable and that we diagnose 5410 // problems with the implicit exception specification. 5411 if (ClassDecl->isDynamicClass() || 5412 ClassDecl->needsOverloadResolutionForCopyAssignment()) 5413 DeclareImplicitCopyAssignment(ClassDecl); 5414 } 5415 5416 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveAssignment()) { 5417 ++ASTContext::NumImplicitMoveAssignmentOperators; 5418 5419 // Likewise for the move assignment operator. 5420 if (ClassDecl->isDynamicClass() || 5421 ClassDecl->needsOverloadResolutionForMoveAssignment()) 5422 DeclareImplicitMoveAssignment(ClassDecl); 5423 } 5424 5425 if (!ClassDecl->hasUserDeclaredDestructor()) { 5426 ++ASTContext::NumImplicitDestructors; 5427 5428 // If we have a dynamic class, then the destructor may be virtual, so we 5429 // have to declare the destructor immediately. This ensures that, e.g., it 5430 // shows up in the right place in the vtable and that we diagnose problems 5431 // with the implicit exception specification. 5432 if (ClassDecl->isDynamicClass() || 5433 ClassDecl->needsOverloadResolutionForDestructor()) 5434 DeclareImplicitDestructor(ClassDecl); 5435 } 5436} 5437 5438void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 5439 if (!D) 5440 return; 5441 5442 int NumParamList = D->getNumTemplateParameterLists(); 5443 for (int i = 0; i < NumParamList; i++) { 5444 TemplateParameterList* Params = D->getTemplateParameterList(i); 5445 for (TemplateParameterList::iterator Param = Params->begin(), 5446 ParamEnd = Params->end(); 5447 Param != ParamEnd; ++Param) { 5448 NamedDecl *Named = cast<NamedDecl>(*Param); 5449 if (Named->getDeclName()) { 5450 S->AddDecl(Named); 5451 IdResolver.AddDecl(Named); 5452 } 5453 } 5454 } 5455} 5456 5457void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5458 if (!D) 5459 return; 5460 5461 TemplateParameterList *Params = 0; 5462 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5463 Params = Template->getTemplateParameters(); 5464 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5465 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5466 Params = PartialSpec->getTemplateParameters(); 5467 else 5468 return; 5469 5470 for (TemplateParameterList::iterator Param = Params->begin(), 5471 ParamEnd = Params->end(); 5472 Param != ParamEnd; ++Param) { 5473 NamedDecl *Named = cast<NamedDecl>(*Param); 5474 if (Named->getDeclName()) { 5475 S->AddDecl(Named); 5476 IdResolver.AddDecl(Named); 5477 } 5478 } 5479} 5480 5481void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5482 if (!RecordD) return; 5483 AdjustDeclIfTemplate(RecordD); 5484 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5485 PushDeclContext(S, Record); 5486} 5487 5488void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5489 if (!RecordD) return; 5490 PopDeclContext(); 5491} 5492 5493/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5494/// parsing a top-level (non-nested) C++ class, and we are now 5495/// parsing those parts of the given Method declaration that could 5496/// not be parsed earlier (C++ [class.mem]p2), such as default 5497/// arguments. This action should enter the scope of the given 5498/// Method declaration as if we had just parsed the qualified method 5499/// name. However, it should not bring the parameters into scope; 5500/// that will be performed by ActOnDelayedCXXMethodParameter. 5501void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5502} 5503 5504/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5505/// C++ method declaration. We're (re-)introducing the given 5506/// function parameter into scope for use in parsing later parts of 5507/// the method declaration. For example, we could see an 5508/// ActOnParamDefaultArgument event for this parameter. 5509void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5510 if (!ParamD) 5511 return; 5512 5513 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5514 5515 // If this parameter has an unparsed default argument, clear it out 5516 // to make way for the parsed default argument. 5517 if (Param->hasUnparsedDefaultArg()) 5518 Param->setDefaultArg(0); 5519 5520 S->AddDecl(Param); 5521 if (Param->getDeclName()) 5522 IdResolver.AddDecl(Param); 5523} 5524 5525/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5526/// processing the delayed method declaration for Method. The method 5527/// declaration is now considered finished. There may be a separate 5528/// ActOnStartOfFunctionDef action later (not necessarily 5529/// immediately!) for this method, if it was also defined inside the 5530/// class body. 5531void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5532 if (!MethodD) 5533 return; 5534 5535 AdjustDeclIfTemplate(MethodD); 5536 5537 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5538 5539 // Now that we have our default arguments, check the constructor 5540 // again. It could produce additional diagnostics or affect whether 5541 // the class has implicitly-declared destructors, among other 5542 // things. 5543 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5544 CheckConstructor(Constructor); 5545 5546 // Check the default arguments, which we may have added. 5547 if (!Method->isInvalidDecl()) 5548 CheckCXXDefaultArguments(Method); 5549} 5550 5551/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5552/// the well-formedness of the constructor declarator @p D with type @p 5553/// R. If there are any errors in the declarator, this routine will 5554/// emit diagnostics and set the invalid bit to true. In any case, the type 5555/// will be updated to reflect a well-formed type for the constructor and 5556/// returned. 5557QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5558 StorageClass &SC) { 5559 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5560 5561 // C++ [class.ctor]p3: 5562 // A constructor shall not be virtual (10.3) or static (9.4). A 5563 // constructor can be invoked for a const, volatile or const 5564 // volatile object. A constructor shall not be declared const, 5565 // volatile, or const volatile (9.3.2). 5566 if (isVirtual) { 5567 if (!D.isInvalidType()) 5568 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5569 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5570 << SourceRange(D.getIdentifierLoc()); 5571 D.setInvalidType(); 5572 } 5573 if (SC == SC_Static) { 5574 if (!D.isInvalidType()) 5575 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5576 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5577 << SourceRange(D.getIdentifierLoc()); 5578 D.setInvalidType(); 5579 SC = SC_None; 5580 } 5581 5582 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5583 if (FTI.TypeQuals != 0) { 5584 if (FTI.TypeQuals & Qualifiers::Const) 5585 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5586 << "const" << SourceRange(D.getIdentifierLoc()); 5587 if (FTI.TypeQuals & Qualifiers::Volatile) 5588 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5589 << "volatile" << SourceRange(D.getIdentifierLoc()); 5590 if (FTI.TypeQuals & Qualifiers::Restrict) 5591 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5592 << "restrict" << SourceRange(D.getIdentifierLoc()); 5593 D.setInvalidType(); 5594 } 5595 5596 // C++0x [class.ctor]p4: 5597 // A constructor shall not be declared with a ref-qualifier. 5598 if (FTI.hasRefQualifier()) { 5599 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5600 << FTI.RefQualifierIsLValueRef 5601 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5602 D.setInvalidType(); 5603 } 5604 5605 // Rebuild the function type "R" without any type qualifiers (in 5606 // case any of the errors above fired) and with "void" as the 5607 // return type, since constructors don't have return types. 5608 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5609 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5610 return R; 5611 5612 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5613 EPI.TypeQuals = 0; 5614 EPI.RefQualifier = RQ_None; 5615 5616 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5617 Proto->getNumArgs(), EPI); 5618} 5619 5620/// CheckConstructor - Checks a fully-formed constructor for 5621/// well-formedness, issuing any diagnostics required. Returns true if 5622/// the constructor declarator is invalid. 5623void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5624 CXXRecordDecl *ClassDecl 5625 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5626 if (!ClassDecl) 5627 return Constructor->setInvalidDecl(); 5628 5629 // C++ [class.copy]p3: 5630 // A declaration of a constructor for a class X is ill-formed if 5631 // its first parameter is of type (optionally cv-qualified) X and 5632 // either there are no other parameters or else all other 5633 // parameters have default arguments. 5634 if (!Constructor->isInvalidDecl() && 5635 ((Constructor->getNumParams() == 1) || 5636 (Constructor->getNumParams() > 1 && 5637 Constructor->getParamDecl(1)->hasDefaultArg())) && 5638 Constructor->getTemplateSpecializationKind() 5639 != TSK_ImplicitInstantiation) { 5640 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5641 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5642 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5643 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5644 const char *ConstRef 5645 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5646 : " const &"; 5647 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5648 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5649 5650 // FIXME: Rather that making the constructor invalid, we should endeavor 5651 // to fix the type. 5652 Constructor->setInvalidDecl(); 5653 } 5654 } 5655} 5656 5657/// CheckDestructor - Checks a fully-formed destructor definition for 5658/// well-formedness, issuing any diagnostics required. Returns true 5659/// on error. 5660bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5661 CXXRecordDecl *RD = Destructor->getParent(); 5662 5663 if (Destructor->isVirtual()) { 5664 SourceLocation Loc; 5665 5666 if (!Destructor->isImplicit()) 5667 Loc = Destructor->getLocation(); 5668 else 5669 Loc = RD->getLocation(); 5670 5671 // If we have a virtual destructor, look up the deallocation function 5672 FunctionDecl *OperatorDelete = 0; 5673 DeclarationName Name = 5674 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5675 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5676 return true; 5677 5678 MarkFunctionReferenced(Loc, OperatorDelete); 5679 5680 Destructor->setOperatorDelete(OperatorDelete); 5681 } 5682 5683 return false; 5684} 5685 5686static inline bool 5687FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5688 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5689 FTI.ArgInfo[0].Param && 5690 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5691} 5692 5693/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5694/// the well-formednes of the destructor declarator @p D with type @p 5695/// R. If there are any errors in the declarator, this routine will 5696/// emit diagnostics and set the declarator to invalid. Even if this happens, 5697/// will be updated to reflect a well-formed type for the destructor and 5698/// returned. 5699QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5700 StorageClass& SC) { 5701 // C++ [class.dtor]p1: 5702 // [...] A typedef-name that names a class is a class-name 5703 // (7.1.3); however, a typedef-name that names a class shall not 5704 // be used as the identifier in the declarator for a destructor 5705 // declaration. 5706 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5707 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5708 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5709 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5710 else if (const TemplateSpecializationType *TST = 5711 DeclaratorType->getAs<TemplateSpecializationType>()) 5712 if (TST->isTypeAlias()) 5713 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5714 << DeclaratorType << 1; 5715 5716 // C++ [class.dtor]p2: 5717 // A destructor is used to destroy objects of its class type. A 5718 // destructor takes no parameters, and no return type can be 5719 // specified for it (not even void). The address of a destructor 5720 // shall not be taken. A destructor shall not be static. A 5721 // destructor can be invoked for a const, volatile or const 5722 // volatile object. A destructor shall not be declared const, 5723 // volatile or const volatile (9.3.2). 5724 if (SC == SC_Static) { 5725 if (!D.isInvalidType()) 5726 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5727 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5728 << SourceRange(D.getIdentifierLoc()) 5729 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5730 5731 SC = SC_None; 5732 } 5733 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5734 // Destructors don't have return types, but the parser will 5735 // happily parse something like: 5736 // 5737 // class X { 5738 // float ~X(); 5739 // }; 5740 // 5741 // The return type will be eliminated later. 5742 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5743 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5744 << SourceRange(D.getIdentifierLoc()); 5745 } 5746 5747 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5748 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5749 if (FTI.TypeQuals & Qualifiers::Const) 5750 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5751 << "const" << SourceRange(D.getIdentifierLoc()); 5752 if (FTI.TypeQuals & Qualifiers::Volatile) 5753 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5754 << "volatile" << SourceRange(D.getIdentifierLoc()); 5755 if (FTI.TypeQuals & Qualifiers::Restrict) 5756 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5757 << "restrict" << SourceRange(D.getIdentifierLoc()); 5758 D.setInvalidType(); 5759 } 5760 5761 // C++0x [class.dtor]p2: 5762 // A destructor shall not be declared with a ref-qualifier. 5763 if (FTI.hasRefQualifier()) { 5764 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5765 << FTI.RefQualifierIsLValueRef 5766 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5767 D.setInvalidType(); 5768 } 5769 5770 // Make sure we don't have any parameters. 5771 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5772 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5773 5774 // Delete the parameters. 5775 FTI.freeArgs(); 5776 D.setInvalidType(); 5777 } 5778 5779 // Make sure the destructor isn't variadic. 5780 if (FTI.isVariadic) { 5781 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5782 D.setInvalidType(); 5783 } 5784 5785 // Rebuild the function type "R" without any type qualifiers or 5786 // parameters (in case any of the errors above fired) and with 5787 // "void" as the return type, since destructors don't have return 5788 // types. 5789 if (!D.isInvalidType()) 5790 return R; 5791 5792 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5793 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5794 EPI.Variadic = false; 5795 EPI.TypeQuals = 0; 5796 EPI.RefQualifier = RQ_None; 5797 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5798} 5799 5800/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5801/// well-formednes of the conversion function declarator @p D with 5802/// type @p R. If there are any errors in the declarator, this routine 5803/// will emit diagnostics and return true. Otherwise, it will return 5804/// false. Either way, the type @p R will be updated to reflect a 5805/// well-formed type for the conversion operator. 5806void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5807 StorageClass& SC) { 5808 // C++ [class.conv.fct]p1: 5809 // Neither parameter types nor return type can be specified. The 5810 // type of a conversion function (8.3.5) is "function taking no 5811 // parameter returning conversion-type-id." 5812 if (SC == SC_Static) { 5813 if (!D.isInvalidType()) 5814 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5815 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5816 << SourceRange(D.getIdentifierLoc()); 5817 D.setInvalidType(); 5818 SC = SC_None; 5819 } 5820 5821 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5822 5823 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5824 // Conversion functions don't have return types, but the parser will 5825 // happily parse something like: 5826 // 5827 // class X { 5828 // float operator bool(); 5829 // }; 5830 // 5831 // The return type will be changed later anyway. 5832 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5833 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5834 << SourceRange(D.getIdentifierLoc()); 5835 D.setInvalidType(); 5836 } 5837 5838 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5839 5840 // Make sure we don't have any parameters. 5841 if (Proto->getNumArgs() > 0) { 5842 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5843 5844 // Delete the parameters. 5845 D.getFunctionTypeInfo().freeArgs(); 5846 D.setInvalidType(); 5847 } else if (Proto->isVariadic()) { 5848 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5849 D.setInvalidType(); 5850 } 5851 5852 // Diagnose "&operator bool()" and other such nonsense. This 5853 // is actually a gcc extension which we don't support. 5854 if (Proto->getResultType() != ConvType) { 5855 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5856 << Proto->getResultType(); 5857 D.setInvalidType(); 5858 ConvType = Proto->getResultType(); 5859 } 5860 5861 // C++ [class.conv.fct]p4: 5862 // The conversion-type-id shall not represent a function type nor 5863 // an array type. 5864 if (ConvType->isArrayType()) { 5865 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5866 ConvType = Context.getPointerType(ConvType); 5867 D.setInvalidType(); 5868 } else if (ConvType->isFunctionType()) { 5869 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5870 ConvType = Context.getPointerType(ConvType); 5871 D.setInvalidType(); 5872 } 5873 5874 // Rebuild the function type "R" without any parameters (in case any 5875 // of the errors above fired) and with the conversion type as the 5876 // return type. 5877 if (D.isInvalidType()) 5878 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5879 5880 // C++0x explicit conversion operators. 5881 if (D.getDeclSpec().isExplicitSpecified()) 5882 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5883 getLangOpts().CPlusPlus11 ? 5884 diag::warn_cxx98_compat_explicit_conversion_functions : 5885 diag::ext_explicit_conversion_functions) 5886 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5887} 5888 5889/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5890/// the declaration of the given C++ conversion function. This routine 5891/// is responsible for recording the conversion function in the C++ 5892/// class, if possible. 5893Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5894 assert(Conversion && "Expected to receive a conversion function declaration"); 5895 5896 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5897 5898 // Make sure we aren't redeclaring the conversion function. 5899 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5900 5901 // C++ [class.conv.fct]p1: 5902 // [...] A conversion function is never used to convert a 5903 // (possibly cv-qualified) object to the (possibly cv-qualified) 5904 // same object type (or a reference to it), to a (possibly 5905 // cv-qualified) base class of that type (or a reference to it), 5906 // or to (possibly cv-qualified) void. 5907 // FIXME: Suppress this warning if the conversion function ends up being a 5908 // virtual function that overrides a virtual function in a base class. 5909 QualType ClassType 5910 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5911 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5912 ConvType = ConvTypeRef->getPointeeType(); 5913 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5914 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5915 /* Suppress diagnostics for instantiations. */; 5916 else if (ConvType->isRecordType()) { 5917 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5918 if (ConvType == ClassType) 5919 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5920 << ClassType; 5921 else if (IsDerivedFrom(ClassType, ConvType)) 5922 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5923 << ClassType << ConvType; 5924 } else if (ConvType->isVoidType()) { 5925 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5926 << ClassType << ConvType; 5927 } 5928 5929 if (FunctionTemplateDecl *ConversionTemplate 5930 = Conversion->getDescribedFunctionTemplate()) 5931 return ConversionTemplate; 5932 5933 return Conversion; 5934} 5935 5936//===----------------------------------------------------------------------===// 5937// Namespace Handling 5938//===----------------------------------------------------------------------===// 5939 5940/// \brief Diagnose a mismatch in 'inline' qualifiers when a namespace is 5941/// reopened. 5942static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc, 5943 SourceLocation Loc, 5944 IdentifierInfo *II, bool *IsInline, 5945 NamespaceDecl *PrevNS) { 5946 assert(*IsInline != PrevNS->isInline()); 5947 5948 // HACK: Work around a bug in libstdc++4.6's <atomic>, where 5949 // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as 5950 // inline namespaces, with the intention of bringing names into namespace std. 5951 // 5952 // We support this just well enough to get that case working; this is not 5953 // sufficient to support reopening namespaces as inline in general. 5954 if (*IsInline && II && II->getName().startswith("__atomic") && 5955 S.getSourceManager().isInSystemHeader(Loc)) { 5956 // Mark all prior declarations of the namespace as inline. 5957 for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS; 5958 NS = NS->getPreviousDecl()) 5959 NS->setInline(*IsInline); 5960 // Patch up the lookup table for the containing namespace. This isn't really 5961 // correct, but it's good enough for this particular case. 5962 for (DeclContext::decl_iterator I = PrevNS->decls_begin(), 5963 E = PrevNS->decls_end(); I != E; ++I) 5964 if (NamedDecl *ND = dyn_cast<NamedDecl>(*I)) 5965 PrevNS->getParent()->makeDeclVisibleInContext(ND); 5966 return; 5967 } 5968 5969 if (PrevNS->isInline()) 5970 // The user probably just forgot the 'inline', so suggest that it 5971 // be added back. 5972 S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5973 << FixItHint::CreateInsertion(KeywordLoc, "inline "); 5974 else 5975 S.Diag(Loc, diag::err_inline_namespace_mismatch) 5976 << IsInline; 5977 5978 S.Diag(PrevNS->getLocation(), diag::note_previous_definition); 5979 *IsInline = PrevNS->isInline(); 5980} 5981 5982/// ActOnStartNamespaceDef - This is called at the start of a namespace 5983/// definition. 5984Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5985 SourceLocation InlineLoc, 5986 SourceLocation NamespaceLoc, 5987 SourceLocation IdentLoc, 5988 IdentifierInfo *II, 5989 SourceLocation LBrace, 5990 AttributeList *AttrList) { 5991 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5992 // For anonymous namespace, take the location of the left brace. 5993 SourceLocation Loc = II ? IdentLoc : LBrace; 5994 bool IsInline = InlineLoc.isValid(); 5995 bool IsInvalid = false; 5996 bool IsStd = false; 5997 bool AddToKnown = false; 5998 Scope *DeclRegionScope = NamespcScope->getParent(); 5999 6000 NamespaceDecl *PrevNS = 0; 6001 if (II) { 6002 // C++ [namespace.def]p2: 6003 // The identifier in an original-namespace-definition shall not 6004 // have been previously defined in the declarative region in 6005 // which the original-namespace-definition appears. The 6006 // identifier in an original-namespace-definition is the name of 6007 // the namespace. Subsequently in that declarative region, it is 6008 // treated as an original-namespace-name. 6009 // 6010 // Since namespace names are unique in their scope, and we don't 6011 // look through using directives, just look for any ordinary names. 6012 6013 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 6014 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 6015 Decl::IDNS_Namespace; 6016 NamedDecl *PrevDecl = 0; 6017 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 6018 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 6019 ++I) { 6020 if ((*I)->getIdentifierNamespace() & IDNS) { 6021 PrevDecl = *I; 6022 break; 6023 } 6024 } 6025 6026 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 6027 6028 if (PrevNS) { 6029 // This is an extended namespace definition. 6030 if (IsInline != PrevNS->isInline()) 6031 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II, 6032 &IsInline, PrevNS); 6033 } else if (PrevDecl) { 6034 // This is an invalid name redefinition. 6035 Diag(Loc, diag::err_redefinition_different_kind) 6036 << II; 6037 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6038 IsInvalid = true; 6039 // Continue on to push Namespc as current DeclContext and return it. 6040 } else if (II->isStr("std") && 6041 CurContext->getRedeclContext()->isTranslationUnit()) { 6042 // This is the first "real" definition of the namespace "std", so update 6043 // our cache of the "std" namespace to point at this definition. 6044 PrevNS = getStdNamespace(); 6045 IsStd = true; 6046 AddToKnown = !IsInline; 6047 } else { 6048 // We've seen this namespace for the first time. 6049 AddToKnown = !IsInline; 6050 } 6051 } else { 6052 // Anonymous namespaces. 6053 6054 // Determine whether the parent already has an anonymous namespace. 6055 DeclContext *Parent = CurContext->getRedeclContext(); 6056 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6057 PrevNS = TU->getAnonymousNamespace(); 6058 } else { 6059 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 6060 PrevNS = ND->getAnonymousNamespace(); 6061 } 6062 6063 if (PrevNS && IsInline != PrevNS->isInline()) 6064 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II, 6065 &IsInline, PrevNS); 6066 } 6067 6068 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 6069 StartLoc, Loc, II, PrevNS); 6070 if (IsInvalid) 6071 Namespc->setInvalidDecl(); 6072 6073 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 6074 6075 // FIXME: Should we be merging attributes? 6076 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 6077 PushNamespaceVisibilityAttr(Attr, Loc); 6078 6079 if (IsStd) 6080 StdNamespace = Namespc; 6081 if (AddToKnown) 6082 KnownNamespaces[Namespc] = false; 6083 6084 if (II) { 6085 PushOnScopeChains(Namespc, DeclRegionScope); 6086 } else { 6087 // Link the anonymous namespace into its parent. 6088 DeclContext *Parent = CurContext->getRedeclContext(); 6089 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6090 TU->setAnonymousNamespace(Namespc); 6091 } else { 6092 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 6093 } 6094 6095 CurContext->addDecl(Namespc); 6096 6097 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 6098 // behaves as if it were replaced by 6099 // namespace unique { /* empty body */ } 6100 // using namespace unique; 6101 // namespace unique { namespace-body } 6102 // where all occurrences of 'unique' in a translation unit are 6103 // replaced by the same identifier and this identifier differs 6104 // from all other identifiers in the entire program. 6105 6106 // We just create the namespace with an empty name and then add an 6107 // implicit using declaration, just like the standard suggests. 6108 // 6109 // CodeGen enforces the "universally unique" aspect by giving all 6110 // declarations semantically contained within an anonymous 6111 // namespace internal linkage. 6112 6113 if (!PrevNS) { 6114 UsingDirectiveDecl* UD 6115 = UsingDirectiveDecl::Create(Context, Parent, 6116 /* 'using' */ LBrace, 6117 /* 'namespace' */ SourceLocation(), 6118 /* qualifier */ NestedNameSpecifierLoc(), 6119 /* identifier */ SourceLocation(), 6120 Namespc, 6121 /* Ancestor */ Parent); 6122 UD->setImplicit(); 6123 Parent->addDecl(UD); 6124 } 6125 } 6126 6127 ActOnDocumentableDecl(Namespc); 6128 6129 // Although we could have an invalid decl (i.e. the namespace name is a 6130 // redefinition), push it as current DeclContext and try to continue parsing. 6131 // FIXME: We should be able to push Namespc here, so that the each DeclContext 6132 // for the namespace has the declarations that showed up in that particular 6133 // namespace definition. 6134 PushDeclContext(NamespcScope, Namespc); 6135 return Namespc; 6136} 6137 6138/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 6139/// is a namespace alias, returns the namespace it points to. 6140static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 6141 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 6142 return AD->getNamespace(); 6143 return dyn_cast_or_null<NamespaceDecl>(D); 6144} 6145 6146/// ActOnFinishNamespaceDef - This callback is called after a namespace is 6147/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 6148void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 6149 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 6150 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 6151 Namespc->setRBraceLoc(RBrace); 6152 PopDeclContext(); 6153 if (Namespc->hasAttr<VisibilityAttr>()) 6154 PopPragmaVisibility(true, RBrace); 6155} 6156 6157CXXRecordDecl *Sema::getStdBadAlloc() const { 6158 return cast_or_null<CXXRecordDecl>( 6159 StdBadAlloc.get(Context.getExternalSource())); 6160} 6161 6162NamespaceDecl *Sema::getStdNamespace() const { 6163 return cast_or_null<NamespaceDecl>( 6164 StdNamespace.get(Context.getExternalSource())); 6165} 6166 6167/// \brief Retrieve the special "std" namespace, which may require us to 6168/// implicitly define the namespace. 6169NamespaceDecl *Sema::getOrCreateStdNamespace() { 6170 if (!StdNamespace) { 6171 // The "std" namespace has not yet been defined, so build one implicitly. 6172 StdNamespace = NamespaceDecl::Create(Context, 6173 Context.getTranslationUnitDecl(), 6174 /*Inline=*/false, 6175 SourceLocation(), SourceLocation(), 6176 &PP.getIdentifierTable().get("std"), 6177 /*PrevDecl=*/0); 6178 getStdNamespace()->setImplicit(true); 6179 } 6180 6181 return getStdNamespace(); 6182} 6183 6184bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 6185 assert(getLangOpts().CPlusPlus && 6186 "Looking for std::initializer_list outside of C++."); 6187 6188 // We're looking for implicit instantiations of 6189 // template <typename E> class std::initializer_list. 6190 6191 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 6192 return false; 6193 6194 ClassTemplateDecl *Template = 0; 6195 const TemplateArgument *Arguments = 0; 6196 6197 if (const RecordType *RT = Ty->getAs<RecordType>()) { 6198 6199 ClassTemplateSpecializationDecl *Specialization = 6200 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 6201 if (!Specialization) 6202 return false; 6203 6204 Template = Specialization->getSpecializedTemplate(); 6205 Arguments = Specialization->getTemplateArgs().data(); 6206 } else if (const TemplateSpecializationType *TST = 6207 Ty->getAs<TemplateSpecializationType>()) { 6208 Template = dyn_cast_or_null<ClassTemplateDecl>( 6209 TST->getTemplateName().getAsTemplateDecl()); 6210 Arguments = TST->getArgs(); 6211 } 6212 if (!Template) 6213 return false; 6214 6215 if (!StdInitializerList) { 6216 // Haven't recognized std::initializer_list yet, maybe this is it. 6217 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 6218 if (TemplateClass->getIdentifier() != 6219 &PP.getIdentifierTable().get("initializer_list") || 6220 !getStdNamespace()->InEnclosingNamespaceSetOf( 6221 TemplateClass->getDeclContext())) 6222 return false; 6223 // This is a template called std::initializer_list, but is it the right 6224 // template? 6225 TemplateParameterList *Params = Template->getTemplateParameters(); 6226 if (Params->getMinRequiredArguments() != 1) 6227 return false; 6228 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 6229 return false; 6230 6231 // It's the right template. 6232 StdInitializerList = Template; 6233 } 6234 6235 if (Template != StdInitializerList) 6236 return false; 6237 6238 // This is an instance of std::initializer_list. Find the argument type. 6239 if (Element) 6240 *Element = Arguments[0].getAsType(); 6241 return true; 6242} 6243 6244static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 6245 NamespaceDecl *Std = S.getStdNamespace(); 6246 if (!Std) { 6247 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6248 return 0; 6249 } 6250 6251 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 6252 Loc, Sema::LookupOrdinaryName); 6253 if (!S.LookupQualifiedName(Result, Std)) { 6254 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6255 return 0; 6256 } 6257 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 6258 if (!Template) { 6259 Result.suppressDiagnostics(); 6260 // We found something weird. Complain about the first thing we found. 6261 NamedDecl *Found = *Result.begin(); 6262 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 6263 return 0; 6264 } 6265 6266 // We found some template called std::initializer_list. Now verify that it's 6267 // correct. 6268 TemplateParameterList *Params = Template->getTemplateParameters(); 6269 if (Params->getMinRequiredArguments() != 1 || 6270 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 6271 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 6272 return 0; 6273 } 6274 6275 return Template; 6276} 6277 6278QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 6279 if (!StdInitializerList) { 6280 StdInitializerList = LookupStdInitializerList(*this, Loc); 6281 if (!StdInitializerList) 6282 return QualType(); 6283 } 6284 6285 TemplateArgumentListInfo Args(Loc, Loc); 6286 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 6287 Context.getTrivialTypeSourceInfo(Element, 6288 Loc))); 6289 return Context.getCanonicalType( 6290 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 6291} 6292 6293bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 6294 // C++ [dcl.init.list]p2: 6295 // A constructor is an initializer-list constructor if its first parameter 6296 // is of type std::initializer_list<E> or reference to possibly cv-qualified 6297 // std::initializer_list<E> for some type E, and either there are no other 6298 // parameters or else all other parameters have default arguments. 6299 if (Ctor->getNumParams() < 1 || 6300 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 6301 return false; 6302 6303 QualType ArgType = Ctor->getParamDecl(0)->getType(); 6304 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 6305 ArgType = RT->getPointeeType().getUnqualifiedType(); 6306 6307 return isStdInitializerList(ArgType, 0); 6308} 6309 6310/// \brief Determine whether a using statement is in a context where it will be 6311/// apply in all contexts. 6312static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 6313 switch (CurContext->getDeclKind()) { 6314 case Decl::TranslationUnit: 6315 return true; 6316 case Decl::LinkageSpec: 6317 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 6318 default: 6319 return false; 6320 } 6321} 6322 6323namespace { 6324 6325// Callback to only accept typo corrections that are namespaces. 6326class NamespaceValidatorCCC : public CorrectionCandidateCallback { 6327 public: 6328 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 6329 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 6330 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 6331 } 6332 return false; 6333 } 6334}; 6335 6336} 6337 6338static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 6339 CXXScopeSpec &SS, 6340 SourceLocation IdentLoc, 6341 IdentifierInfo *Ident) { 6342 NamespaceValidatorCCC Validator; 6343 R.clear(); 6344 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 6345 R.getLookupKind(), Sc, &SS, 6346 Validator)) { 6347 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 6348 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 6349 if (DeclContext *DC = S.computeDeclContext(SS, false)) 6350 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 6351 << Ident << DC << CorrectedQuotedStr << SS.getRange() 6352 << FixItHint::CreateReplacement(Corrected.getCorrectionRange(), 6353 CorrectedStr); 6354 else 6355 S.Diag(IdentLoc, diag::err_using_directive_suggest) 6356 << Ident << CorrectedQuotedStr 6357 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 6358 6359 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 6360 diag::note_namespace_defined_here) << CorrectedQuotedStr; 6361 6362 R.addDecl(Corrected.getCorrectionDecl()); 6363 return true; 6364 } 6365 return false; 6366} 6367 6368Decl *Sema::ActOnUsingDirective(Scope *S, 6369 SourceLocation UsingLoc, 6370 SourceLocation NamespcLoc, 6371 CXXScopeSpec &SS, 6372 SourceLocation IdentLoc, 6373 IdentifierInfo *NamespcName, 6374 AttributeList *AttrList) { 6375 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6376 assert(NamespcName && "Invalid NamespcName."); 6377 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 6378 6379 // This can only happen along a recovery path. 6380 while (S->getFlags() & Scope::TemplateParamScope) 6381 S = S->getParent(); 6382 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6383 6384 UsingDirectiveDecl *UDir = 0; 6385 NestedNameSpecifier *Qualifier = 0; 6386 if (SS.isSet()) 6387 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 6388 6389 // Lookup namespace name. 6390 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 6391 LookupParsedName(R, S, &SS); 6392 if (R.isAmbiguous()) 6393 return 0; 6394 6395 if (R.empty()) { 6396 R.clear(); 6397 // Allow "using namespace std;" or "using namespace ::std;" even if 6398 // "std" hasn't been defined yet, for GCC compatibility. 6399 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 6400 NamespcName->isStr("std")) { 6401 Diag(IdentLoc, diag::ext_using_undefined_std); 6402 R.addDecl(getOrCreateStdNamespace()); 6403 R.resolveKind(); 6404 } 6405 // Otherwise, attempt typo correction. 6406 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 6407 } 6408 6409 if (!R.empty()) { 6410 NamedDecl *Named = R.getFoundDecl(); 6411 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 6412 && "expected namespace decl"); 6413 // C++ [namespace.udir]p1: 6414 // A using-directive specifies that the names in the nominated 6415 // namespace can be used in the scope in which the 6416 // using-directive appears after the using-directive. During 6417 // unqualified name lookup (3.4.1), the names appear as if they 6418 // were declared in the nearest enclosing namespace which 6419 // contains both the using-directive and the nominated 6420 // namespace. [Note: in this context, "contains" means "contains 6421 // directly or indirectly". ] 6422 6423 // Find enclosing context containing both using-directive and 6424 // nominated namespace. 6425 NamespaceDecl *NS = getNamespaceDecl(Named); 6426 DeclContext *CommonAncestor = cast<DeclContext>(NS); 6427 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 6428 CommonAncestor = CommonAncestor->getParent(); 6429 6430 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 6431 SS.getWithLocInContext(Context), 6432 IdentLoc, Named, CommonAncestor); 6433 6434 if (IsUsingDirectiveInToplevelContext(CurContext) && 6435 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 6436 Diag(IdentLoc, diag::warn_using_directive_in_header); 6437 } 6438 6439 PushUsingDirective(S, UDir); 6440 } else { 6441 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6442 } 6443 6444 // FIXME: We ignore attributes for now. 6445 return UDir; 6446} 6447 6448void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 6449 // If the scope has an associated entity and the using directive is at 6450 // namespace or translation unit scope, add the UsingDirectiveDecl into 6451 // its lookup structure so qualified name lookup can find it. 6452 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 6453 if (Ctx && !Ctx->isFunctionOrMethod()) 6454 Ctx->addDecl(UDir); 6455 else 6456 // Otherwise, it is at block sope. The using-directives will affect lookup 6457 // only to the end of the scope. 6458 S->PushUsingDirective(UDir); 6459} 6460 6461 6462Decl *Sema::ActOnUsingDeclaration(Scope *S, 6463 AccessSpecifier AS, 6464 bool HasUsingKeyword, 6465 SourceLocation UsingLoc, 6466 CXXScopeSpec &SS, 6467 UnqualifiedId &Name, 6468 AttributeList *AttrList, 6469 bool IsTypeName, 6470 SourceLocation TypenameLoc) { 6471 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6472 6473 switch (Name.getKind()) { 6474 case UnqualifiedId::IK_ImplicitSelfParam: 6475 case UnqualifiedId::IK_Identifier: 6476 case UnqualifiedId::IK_OperatorFunctionId: 6477 case UnqualifiedId::IK_LiteralOperatorId: 6478 case UnqualifiedId::IK_ConversionFunctionId: 6479 break; 6480 6481 case UnqualifiedId::IK_ConstructorName: 6482 case UnqualifiedId::IK_ConstructorTemplateId: 6483 // C++11 inheriting constructors. 6484 Diag(Name.getLocStart(), 6485 getLangOpts().CPlusPlus11 ? 6486 // FIXME: Produce warn_cxx98_compat_using_decl_constructor 6487 // instead once inheriting constructors work. 6488 diag::err_using_decl_constructor_unsupported : 6489 diag::err_using_decl_constructor) 6490 << SS.getRange(); 6491 6492 if (getLangOpts().CPlusPlus11) break; 6493 6494 return 0; 6495 6496 case UnqualifiedId::IK_DestructorName: 6497 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 6498 << SS.getRange(); 6499 return 0; 6500 6501 case UnqualifiedId::IK_TemplateId: 6502 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 6503 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 6504 return 0; 6505 } 6506 6507 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 6508 DeclarationName TargetName = TargetNameInfo.getName(); 6509 if (!TargetName) 6510 return 0; 6511 6512 // Warn about using declarations. 6513 // TODO: store that the declaration was written without 'using' and 6514 // talk about access decls instead of using decls in the 6515 // diagnostics. 6516 if (!HasUsingKeyword) { 6517 UsingLoc = Name.getLocStart(); 6518 6519 Diag(UsingLoc, diag::warn_access_decl_deprecated) 6520 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 6521 } 6522 6523 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 6524 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 6525 return 0; 6526 6527 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 6528 TargetNameInfo, AttrList, 6529 /* IsInstantiation */ false, 6530 IsTypeName, TypenameLoc); 6531 if (UD) 6532 PushOnScopeChains(UD, S, /*AddToContext*/ false); 6533 6534 return UD; 6535} 6536 6537/// \brief Determine whether a using declaration considers the given 6538/// declarations as "equivalent", e.g., if they are redeclarations of 6539/// the same entity or are both typedefs of the same type. 6540static bool 6541IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 6542 bool &SuppressRedeclaration) { 6543 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 6544 SuppressRedeclaration = false; 6545 return true; 6546 } 6547 6548 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 6549 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6550 SuppressRedeclaration = true; 6551 return Context.hasSameType(TD1->getUnderlyingType(), 6552 TD2->getUnderlyingType()); 6553 } 6554 6555 return false; 6556} 6557 6558 6559/// Determines whether to create a using shadow decl for a particular 6560/// decl, given the set of decls existing prior to this using lookup. 6561bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6562 const LookupResult &Previous) { 6563 // Diagnose finding a decl which is not from a base class of the 6564 // current class. We do this now because there are cases where this 6565 // function will silently decide not to build a shadow decl, which 6566 // will pre-empt further diagnostics. 6567 // 6568 // We don't need to do this in C++0x because we do the check once on 6569 // the qualifier. 6570 // 6571 // FIXME: diagnose the following if we care enough: 6572 // struct A { int foo; }; 6573 // struct B : A { using A::foo; }; 6574 // template <class T> struct C : A {}; 6575 // template <class T> struct D : C<T> { using B::foo; } // <--- 6576 // This is invalid (during instantiation) in C++03 because B::foo 6577 // resolves to the using decl in B, which is not a base class of D<T>. 6578 // We can't diagnose it immediately because C<T> is an unknown 6579 // specialization. The UsingShadowDecl in D<T> then points directly 6580 // to A::foo, which will look well-formed when we instantiate. 6581 // The right solution is to not collapse the shadow-decl chain. 6582 if (!getLangOpts().CPlusPlus11 && CurContext->isRecord()) { 6583 DeclContext *OrigDC = Orig->getDeclContext(); 6584 6585 // Handle enums and anonymous structs. 6586 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6587 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6588 while (OrigRec->isAnonymousStructOrUnion()) 6589 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6590 6591 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6592 if (OrigDC == CurContext) { 6593 Diag(Using->getLocation(), 6594 diag::err_using_decl_nested_name_specifier_is_current_class) 6595 << Using->getQualifierLoc().getSourceRange(); 6596 Diag(Orig->getLocation(), diag::note_using_decl_target); 6597 return true; 6598 } 6599 6600 Diag(Using->getQualifierLoc().getBeginLoc(), 6601 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6602 << Using->getQualifier() 6603 << cast<CXXRecordDecl>(CurContext) 6604 << Using->getQualifierLoc().getSourceRange(); 6605 Diag(Orig->getLocation(), diag::note_using_decl_target); 6606 return true; 6607 } 6608 } 6609 6610 if (Previous.empty()) return false; 6611 6612 NamedDecl *Target = Orig; 6613 if (isa<UsingShadowDecl>(Target)) 6614 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6615 6616 // If the target happens to be one of the previous declarations, we 6617 // don't have a conflict. 6618 // 6619 // FIXME: but we might be increasing its access, in which case we 6620 // should redeclare it. 6621 NamedDecl *NonTag = 0, *Tag = 0; 6622 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6623 I != E; ++I) { 6624 NamedDecl *D = (*I)->getUnderlyingDecl(); 6625 bool Result; 6626 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6627 return Result; 6628 6629 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6630 } 6631 6632 if (Target->isFunctionOrFunctionTemplate()) { 6633 FunctionDecl *FD; 6634 if (isa<FunctionTemplateDecl>(Target)) 6635 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6636 else 6637 FD = cast<FunctionDecl>(Target); 6638 6639 NamedDecl *OldDecl = 0; 6640 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6641 case Ovl_Overload: 6642 return false; 6643 6644 case Ovl_NonFunction: 6645 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6646 break; 6647 6648 // We found a decl with the exact signature. 6649 case Ovl_Match: 6650 // If we're in a record, we want to hide the target, so we 6651 // return true (without a diagnostic) to tell the caller not to 6652 // build a shadow decl. 6653 if (CurContext->isRecord()) 6654 return true; 6655 6656 // If we're not in a record, this is an error. 6657 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6658 break; 6659 } 6660 6661 Diag(Target->getLocation(), diag::note_using_decl_target); 6662 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6663 return true; 6664 } 6665 6666 // Target is not a function. 6667 6668 if (isa<TagDecl>(Target)) { 6669 // No conflict between a tag and a non-tag. 6670 if (!Tag) return false; 6671 6672 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6673 Diag(Target->getLocation(), diag::note_using_decl_target); 6674 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6675 return true; 6676 } 6677 6678 // No conflict between a tag and a non-tag. 6679 if (!NonTag) return false; 6680 6681 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6682 Diag(Target->getLocation(), diag::note_using_decl_target); 6683 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6684 return true; 6685} 6686 6687/// Builds a shadow declaration corresponding to a 'using' declaration. 6688UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6689 UsingDecl *UD, 6690 NamedDecl *Orig) { 6691 6692 // If we resolved to another shadow declaration, just coalesce them. 6693 NamedDecl *Target = Orig; 6694 if (isa<UsingShadowDecl>(Target)) { 6695 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6696 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6697 } 6698 6699 UsingShadowDecl *Shadow 6700 = UsingShadowDecl::Create(Context, CurContext, 6701 UD->getLocation(), UD, Target); 6702 UD->addShadowDecl(Shadow); 6703 6704 Shadow->setAccess(UD->getAccess()); 6705 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6706 Shadow->setInvalidDecl(); 6707 6708 if (S) 6709 PushOnScopeChains(Shadow, S); 6710 else 6711 CurContext->addDecl(Shadow); 6712 6713 6714 return Shadow; 6715} 6716 6717/// Hides a using shadow declaration. This is required by the current 6718/// using-decl implementation when a resolvable using declaration in a 6719/// class is followed by a declaration which would hide or override 6720/// one or more of the using decl's targets; for example: 6721/// 6722/// struct Base { void foo(int); }; 6723/// struct Derived : Base { 6724/// using Base::foo; 6725/// void foo(int); 6726/// }; 6727/// 6728/// The governing language is C++03 [namespace.udecl]p12: 6729/// 6730/// When a using-declaration brings names from a base class into a 6731/// derived class scope, member functions in the derived class 6732/// override and/or hide member functions with the same name and 6733/// parameter types in a base class (rather than conflicting). 6734/// 6735/// There are two ways to implement this: 6736/// (1) optimistically create shadow decls when they're not hidden 6737/// by existing declarations, or 6738/// (2) don't create any shadow decls (or at least don't make them 6739/// visible) until we've fully parsed/instantiated the class. 6740/// The problem with (1) is that we might have to retroactively remove 6741/// a shadow decl, which requires several O(n) operations because the 6742/// decl structures are (very reasonably) not designed for removal. 6743/// (2) avoids this but is very fiddly and phase-dependent. 6744void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6745 if (Shadow->getDeclName().getNameKind() == 6746 DeclarationName::CXXConversionFunctionName) 6747 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6748 6749 // Remove it from the DeclContext... 6750 Shadow->getDeclContext()->removeDecl(Shadow); 6751 6752 // ...and the scope, if applicable... 6753 if (S) { 6754 S->RemoveDecl(Shadow); 6755 IdResolver.RemoveDecl(Shadow); 6756 } 6757 6758 // ...and the using decl. 6759 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6760 6761 // TODO: complain somehow if Shadow was used. It shouldn't 6762 // be possible for this to happen, because...? 6763} 6764 6765/// Builds a using declaration. 6766/// 6767/// \param IsInstantiation - Whether this call arises from an 6768/// instantiation of an unresolved using declaration. We treat 6769/// the lookup differently for these declarations. 6770NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6771 SourceLocation UsingLoc, 6772 CXXScopeSpec &SS, 6773 const DeclarationNameInfo &NameInfo, 6774 AttributeList *AttrList, 6775 bool IsInstantiation, 6776 bool IsTypeName, 6777 SourceLocation TypenameLoc) { 6778 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6779 SourceLocation IdentLoc = NameInfo.getLoc(); 6780 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6781 6782 // FIXME: We ignore attributes for now. 6783 6784 if (SS.isEmpty()) { 6785 Diag(IdentLoc, diag::err_using_requires_qualname); 6786 return 0; 6787 } 6788 6789 // Do the redeclaration lookup in the current scope. 6790 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6791 ForRedeclaration); 6792 Previous.setHideTags(false); 6793 if (S) { 6794 LookupName(Previous, S); 6795 6796 // It is really dumb that we have to do this. 6797 LookupResult::Filter F = Previous.makeFilter(); 6798 while (F.hasNext()) { 6799 NamedDecl *D = F.next(); 6800 if (!isDeclInScope(D, CurContext, S)) 6801 F.erase(); 6802 } 6803 F.done(); 6804 } else { 6805 assert(IsInstantiation && "no scope in non-instantiation"); 6806 assert(CurContext->isRecord() && "scope not record in instantiation"); 6807 LookupQualifiedName(Previous, CurContext); 6808 } 6809 6810 // Check for invalid redeclarations. 6811 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6812 return 0; 6813 6814 // Check for bad qualifiers. 6815 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6816 return 0; 6817 6818 DeclContext *LookupContext = computeDeclContext(SS); 6819 NamedDecl *D; 6820 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6821 if (!LookupContext) { 6822 if (IsTypeName) { 6823 // FIXME: not all declaration name kinds are legal here 6824 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6825 UsingLoc, TypenameLoc, 6826 QualifierLoc, 6827 IdentLoc, NameInfo.getName()); 6828 } else { 6829 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6830 QualifierLoc, NameInfo); 6831 } 6832 } else { 6833 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6834 NameInfo, IsTypeName); 6835 } 6836 D->setAccess(AS); 6837 CurContext->addDecl(D); 6838 6839 if (!LookupContext) return D; 6840 UsingDecl *UD = cast<UsingDecl>(D); 6841 6842 if (RequireCompleteDeclContext(SS, LookupContext)) { 6843 UD->setInvalidDecl(); 6844 return UD; 6845 } 6846 6847 // The normal rules do not apply to inheriting constructor declarations. 6848 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6849 if (CheckInheritingConstructorUsingDecl(UD)) 6850 UD->setInvalidDecl(); 6851 return UD; 6852 } 6853 6854 // Otherwise, look up the target name. 6855 6856 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6857 6858 // Unlike most lookups, we don't always want to hide tag 6859 // declarations: tag names are visible through the using declaration 6860 // even if hidden by ordinary names, *except* in a dependent context 6861 // where it's important for the sanity of two-phase lookup. 6862 if (!IsInstantiation) 6863 R.setHideTags(false); 6864 6865 // For the purposes of this lookup, we have a base object type 6866 // equal to that of the current context. 6867 if (CurContext->isRecord()) { 6868 R.setBaseObjectType( 6869 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6870 } 6871 6872 LookupQualifiedName(R, LookupContext); 6873 6874 if (R.empty()) { 6875 Diag(IdentLoc, diag::err_no_member) 6876 << NameInfo.getName() << LookupContext << SS.getRange(); 6877 UD->setInvalidDecl(); 6878 return UD; 6879 } 6880 6881 if (R.isAmbiguous()) { 6882 UD->setInvalidDecl(); 6883 return UD; 6884 } 6885 6886 if (IsTypeName) { 6887 // If we asked for a typename and got a non-type decl, error out. 6888 if (!R.getAsSingle<TypeDecl>()) { 6889 Diag(IdentLoc, diag::err_using_typename_non_type); 6890 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6891 Diag((*I)->getUnderlyingDecl()->getLocation(), 6892 diag::note_using_decl_target); 6893 UD->setInvalidDecl(); 6894 return UD; 6895 } 6896 } else { 6897 // If we asked for a non-typename and we got a type, error out, 6898 // but only if this is an instantiation of an unresolved using 6899 // decl. Otherwise just silently find the type name. 6900 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6901 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6902 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6903 UD->setInvalidDecl(); 6904 return UD; 6905 } 6906 } 6907 6908 // C++0x N2914 [namespace.udecl]p6: 6909 // A using-declaration shall not name a namespace. 6910 if (R.getAsSingle<NamespaceDecl>()) { 6911 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6912 << SS.getRange(); 6913 UD->setInvalidDecl(); 6914 return UD; 6915 } 6916 6917 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6918 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6919 BuildUsingShadowDecl(S, UD, *I); 6920 } 6921 6922 return UD; 6923} 6924 6925/// Additional checks for a using declaration referring to a constructor name. 6926bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6927 assert(!UD->isTypeName() && "expecting a constructor name"); 6928 6929 const Type *SourceType = UD->getQualifier()->getAsType(); 6930 assert(SourceType && 6931 "Using decl naming constructor doesn't have type in scope spec."); 6932 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6933 6934 // Check whether the named type is a direct base class. 6935 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6936 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6937 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6938 BaseIt != BaseE; ++BaseIt) { 6939 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6940 if (CanonicalSourceType == BaseType) 6941 break; 6942 if (BaseIt->getType()->isDependentType()) 6943 break; 6944 } 6945 6946 if (BaseIt == BaseE) { 6947 // Did not find SourceType in the bases. 6948 Diag(UD->getUsingLocation(), 6949 diag::err_using_decl_constructor_not_in_direct_base) 6950 << UD->getNameInfo().getSourceRange() 6951 << QualType(SourceType, 0) << TargetClass; 6952 return true; 6953 } 6954 6955 if (!CurContext->isDependentContext()) 6956 BaseIt->setInheritConstructors(); 6957 6958 return false; 6959} 6960 6961/// Checks that the given using declaration is not an invalid 6962/// redeclaration. Note that this is checking only for the using decl 6963/// itself, not for any ill-formedness among the UsingShadowDecls. 6964bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6965 bool isTypeName, 6966 const CXXScopeSpec &SS, 6967 SourceLocation NameLoc, 6968 const LookupResult &Prev) { 6969 // C++03 [namespace.udecl]p8: 6970 // C++0x [namespace.udecl]p10: 6971 // A using-declaration is a declaration and can therefore be used 6972 // repeatedly where (and only where) multiple declarations are 6973 // allowed. 6974 // 6975 // That's in non-member contexts. 6976 if (!CurContext->getRedeclContext()->isRecord()) 6977 return false; 6978 6979 NestedNameSpecifier *Qual 6980 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6981 6982 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6983 NamedDecl *D = *I; 6984 6985 bool DTypename; 6986 NestedNameSpecifier *DQual; 6987 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6988 DTypename = UD->isTypeName(); 6989 DQual = UD->getQualifier(); 6990 } else if (UnresolvedUsingValueDecl *UD 6991 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6992 DTypename = false; 6993 DQual = UD->getQualifier(); 6994 } else if (UnresolvedUsingTypenameDecl *UD 6995 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6996 DTypename = true; 6997 DQual = UD->getQualifier(); 6998 } else continue; 6999 7000 // using decls differ if one says 'typename' and the other doesn't. 7001 // FIXME: non-dependent using decls? 7002 if (isTypeName != DTypename) continue; 7003 7004 // using decls differ if they name different scopes (but note that 7005 // template instantiation can cause this check to trigger when it 7006 // didn't before instantiation). 7007 if (Context.getCanonicalNestedNameSpecifier(Qual) != 7008 Context.getCanonicalNestedNameSpecifier(DQual)) 7009 continue; 7010 7011 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 7012 Diag(D->getLocation(), diag::note_using_decl) << 1; 7013 return true; 7014 } 7015 7016 return false; 7017} 7018 7019 7020/// Checks that the given nested-name qualifier used in a using decl 7021/// in the current context is appropriately related to the current 7022/// scope. If an error is found, diagnoses it and returns true. 7023bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 7024 const CXXScopeSpec &SS, 7025 SourceLocation NameLoc) { 7026 DeclContext *NamedContext = computeDeclContext(SS); 7027 7028 if (!CurContext->isRecord()) { 7029 // C++03 [namespace.udecl]p3: 7030 // C++0x [namespace.udecl]p8: 7031 // A using-declaration for a class member shall be a member-declaration. 7032 7033 // If we weren't able to compute a valid scope, it must be a 7034 // dependent class scope. 7035 if (!NamedContext || NamedContext->isRecord()) { 7036 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 7037 << SS.getRange(); 7038 return true; 7039 } 7040 7041 // Otherwise, everything is known to be fine. 7042 return false; 7043 } 7044 7045 // The current scope is a record. 7046 7047 // If the named context is dependent, we can't decide much. 7048 if (!NamedContext) { 7049 // FIXME: in C++0x, we can diagnose if we can prove that the 7050 // nested-name-specifier does not refer to a base class, which is 7051 // still possible in some cases. 7052 7053 // Otherwise we have to conservatively report that things might be 7054 // okay. 7055 return false; 7056 } 7057 7058 if (!NamedContext->isRecord()) { 7059 // Ideally this would point at the last name in the specifier, 7060 // but we don't have that level of source info. 7061 Diag(SS.getRange().getBegin(), 7062 diag::err_using_decl_nested_name_specifier_is_not_class) 7063 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 7064 return true; 7065 } 7066 7067 if (!NamedContext->isDependentContext() && 7068 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 7069 return true; 7070 7071 if (getLangOpts().CPlusPlus11) { 7072 // C++0x [namespace.udecl]p3: 7073 // In a using-declaration used as a member-declaration, the 7074 // nested-name-specifier shall name a base class of the class 7075 // being defined. 7076 7077 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 7078 cast<CXXRecordDecl>(NamedContext))) { 7079 if (CurContext == NamedContext) { 7080 Diag(NameLoc, 7081 diag::err_using_decl_nested_name_specifier_is_current_class) 7082 << SS.getRange(); 7083 return true; 7084 } 7085 7086 Diag(SS.getRange().getBegin(), 7087 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7088 << (NestedNameSpecifier*) SS.getScopeRep() 7089 << cast<CXXRecordDecl>(CurContext) 7090 << SS.getRange(); 7091 return true; 7092 } 7093 7094 return false; 7095 } 7096 7097 // C++03 [namespace.udecl]p4: 7098 // A using-declaration used as a member-declaration shall refer 7099 // to a member of a base class of the class being defined [etc.]. 7100 7101 // Salient point: SS doesn't have to name a base class as long as 7102 // lookup only finds members from base classes. Therefore we can 7103 // diagnose here only if we can prove that that can't happen, 7104 // i.e. if the class hierarchies provably don't intersect. 7105 7106 // TODO: it would be nice if "definitely valid" results were cached 7107 // in the UsingDecl and UsingShadowDecl so that these checks didn't 7108 // need to be repeated. 7109 7110 struct UserData { 7111 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 7112 7113 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 7114 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7115 Data->Bases.insert(Base); 7116 return true; 7117 } 7118 7119 bool hasDependentBases(const CXXRecordDecl *Class) { 7120 return !Class->forallBases(collect, this); 7121 } 7122 7123 /// Returns true if the base is dependent or is one of the 7124 /// accumulated base classes. 7125 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 7126 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7127 return !Data->Bases.count(Base); 7128 } 7129 7130 bool mightShareBases(const CXXRecordDecl *Class) { 7131 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 7132 } 7133 }; 7134 7135 UserData Data; 7136 7137 // Returns false if we find a dependent base. 7138 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 7139 return false; 7140 7141 // Returns false if the class has a dependent base or if it or one 7142 // of its bases is present in the base set of the current context. 7143 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 7144 return false; 7145 7146 Diag(SS.getRange().getBegin(), 7147 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7148 << (NestedNameSpecifier*) SS.getScopeRep() 7149 << cast<CXXRecordDecl>(CurContext) 7150 << SS.getRange(); 7151 7152 return true; 7153} 7154 7155Decl *Sema::ActOnAliasDeclaration(Scope *S, 7156 AccessSpecifier AS, 7157 MultiTemplateParamsArg TemplateParamLists, 7158 SourceLocation UsingLoc, 7159 UnqualifiedId &Name, 7160 TypeResult Type) { 7161 // Skip up to the relevant declaration scope. 7162 while (S->getFlags() & Scope::TemplateParamScope) 7163 S = S->getParent(); 7164 assert((S->getFlags() & Scope::DeclScope) && 7165 "got alias-declaration outside of declaration scope"); 7166 7167 if (Type.isInvalid()) 7168 return 0; 7169 7170 bool Invalid = false; 7171 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 7172 TypeSourceInfo *TInfo = 0; 7173 GetTypeFromParser(Type.get(), &TInfo); 7174 7175 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 7176 return 0; 7177 7178 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 7179 UPPC_DeclarationType)) { 7180 Invalid = true; 7181 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 7182 TInfo->getTypeLoc().getBeginLoc()); 7183 } 7184 7185 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 7186 LookupName(Previous, S); 7187 7188 // Warn about shadowing the name of a template parameter. 7189 if (Previous.isSingleResult() && 7190 Previous.getFoundDecl()->isTemplateParameter()) { 7191 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 7192 Previous.clear(); 7193 } 7194 7195 assert(Name.Kind == UnqualifiedId::IK_Identifier && 7196 "name in alias declaration must be an identifier"); 7197 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 7198 Name.StartLocation, 7199 Name.Identifier, TInfo); 7200 7201 NewTD->setAccess(AS); 7202 7203 if (Invalid) 7204 NewTD->setInvalidDecl(); 7205 7206 CheckTypedefForVariablyModifiedType(S, NewTD); 7207 Invalid |= NewTD->isInvalidDecl(); 7208 7209 bool Redeclaration = false; 7210 7211 NamedDecl *NewND; 7212 if (TemplateParamLists.size()) { 7213 TypeAliasTemplateDecl *OldDecl = 0; 7214 TemplateParameterList *OldTemplateParams = 0; 7215 7216 if (TemplateParamLists.size() != 1) { 7217 Diag(UsingLoc, diag::err_alias_template_extra_headers) 7218 << SourceRange(TemplateParamLists[1]->getTemplateLoc(), 7219 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); 7220 } 7221 TemplateParameterList *TemplateParams = TemplateParamLists[0]; 7222 7223 // Only consider previous declarations in the same scope. 7224 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 7225 /*ExplicitInstantiationOrSpecialization*/false); 7226 if (!Previous.empty()) { 7227 Redeclaration = true; 7228 7229 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 7230 if (!OldDecl && !Invalid) { 7231 Diag(UsingLoc, diag::err_redefinition_different_kind) 7232 << Name.Identifier; 7233 7234 NamedDecl *OldD = Previous.getRepresentativeDecl(); 7235 if (OldD->getLocation().isValid()) 7236 Diag(OldD->getLocation(), diag::note_previous_definition); 7237 7238 Invalid = true; 7239 } 7240 7241 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 7242 if (TemplateParameterListsAreEqual(TemplateParams, 7243 OldDecl->getTemplateParameters(), 7244 /*Complain=*/true, 7245 TPL_TemplateMatch)) 7246 OldTemplateParams = OldDecl->getTemplateParameters(); 7247 else 7248 Invalid = true; 7249 7250 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 7251 if (!Invalid && 7252 !Context.hasSameType(OldTD->getUnderlyingType(), 7253 NewTD->getUnderlyingType())) { 7254 // FIXME: The C++0x standard does not clearly say this is ill-formed, 7255 // but we can't reasonably accept it. 7256 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 7257 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 7258 if (OldTD->getLocation().isValid()) 7259 Diag(OldTD->getLocation(), diag::note_previous_definition); 7260 Invalid = true; 7261 } 7262 } 7263 } 7264 7265 // Merge any previous default template arguments into our parameters, 7266 // and check the parameter list. 7267 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 7268 TPC_TypeAliasTemplate)) 7269 return 0; 7270 7271 TypeAliasTemplateDecl *NewDecl = 7272 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 7273 Name.Identifier, TemplateParams, 7274 NewTD); 7275 7276 NewDecl->setAccess(AS); 7277 7278 if (Invalid) 7279 NewDecl->setInvalidDecl(); 7280 else if (OldDecl) 7281 NewDecl->setPreviousDeclaration(OldDecl); 7282 7283 NewND = NewDecl; 7284 } else { 7285 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 7286 NewND = NewTD; 7287 } 7288 7289 if (!Redeclaration) 7290 PushOnScopeChains(NewND, S); 7291 7292 ActOnDocumentableDecl(NewND); 7293 return NewND; 7294} 7295 7296Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 7297 SourceLocation NamespaceLoc, 7298 SourceLocation AliasLoc, 7299 IdentifierInfo *Alias, 7300 CXXScopeSpec &SS, 7301 SourceLocation IdentLoc, 7302 IdentifierInfo *Ident) { 7303 7304 // Lookup the namespace name. 7305 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 7306 LookupParsedName(R, S, &SS); 7307 7308 // Check if we have a previous declaration with the same name. 7309 NamedDecl *PrevDecl 7310 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 7311 ForRedeclaration); 7312 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 7313 PrevDecl = 0; 7314 7315 if (PrevDecl) { 7316 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 7317 // We already have an alias with the same name that points to the same 7318 // namespace, so don't create a new one. 7319 // FIXME: At some point, we'll want to create the (redundant) 7320 // declaration to maintain better source information. 7321 if (!R.isAmbiguous() && !R.empty() && 7322 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 7323 return 0; 7324 } 7325 7326 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 7327 diag::err_redefinition_different_kind; 7328 Diag(AliasLoc, DiagID) << Alias; 7329 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7330 return 0; 7331 } 7332 7333 if (R.isAmbiguous()) 7334 return 0; 7335 7336 if (R.empty()) { 7337 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 7338 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 7339 return 0; 7340 } 7341 } 7342 7343 NamespaceAliasDecl *AliasDecl = 7344 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 7345 Alias, SS.getWithLocInContext(Context), 7346 IdentLoc, R.getFoundDecl()); 7347 7348 PushOnScopeChains(AliasDecl, S); 7349 return AliasDecl; 7350} 7351 7352Sema::ImplicitExceptionSpecification 7353Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 7354 CXXMethodDecl *MD) { 7355 CXXRecordDecl *ClassDecl = MD->getParent(); 7356 7357 // C++ [except.spec]p14: 7358 // An implicitly declared special member function (Clause 12) shall have an 7359 // exception-specification. [...] 7360 ImplicitExceptionSpecification ExceptSpec(*this); 7361 if (ClassDecl->isInvalidDecl()) 7362 return ExceptSpec; 7363 7364 // Direct base-class constructors. 7365 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7366 BEnd = ClassDecl->bases_end(); 7367 B != BEnd; ++B) { 7368 if (B->isVirtual()) // Handled below. 7369 continue; 7370 7371 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7372 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7373 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7374 // If this is a deleted function, add it anyway. This might be conformant 7375 // with the standard. This might not. I'm not sure. It might not matter. 7376 if (Constructor) 7377 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7378 } 7379 } 7380 7381 // Virtual base-class constructors. 7382 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7383 BEnd = ClassDecl->vbases_end(); 7384 B != BEnd; ++B) { 7385 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7386 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7387 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7388 // If this is a deleted function, add it anyway. This might be conformant 7389 // with the standard. This might not. I'm not sure. It might not matter. 7390 if (Constructor) 7391 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7392 } 7393 } 7394 7395 // Field constructors. 7396 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7397 FEnd = ClassDecl->field_end(); 7398 F != FEnd; ++F) { 7399 if (F->hasInClassInitializer()) { 7400 if (Expr *E = F->getInClassInitializer()) 7401 ExceptSpec.CalledExpr(E); 7402 else if (!F->isInvalidDecl()) 7403 // DR1351: 7404 // If the brace-or-equal-initializer of a non-static data member 7405 // invokes a defaulted default constructor of its class or of an 7406 // enclosing class in a potentially evaluated subexpression, the 7407 // program is ill-formed. 7408 // 7409 // This resolution is unworkable: the exception specification of the 7410 // default constructor can be needed in an unevaluated context, in 7411 // particular, in the operand of a noexcept-expression, and we can be 7412 // unable to compute an exception specification for an enclosed class. 7413 // 7414 // We do not allow an in-class initializer to require the evaluation 7415 // of the exception specification for any in-class initializer whose 7416 // definition is not lexically complete. 7417 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 7418 } else if (const RecordType *RecordTy 7419 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 7420 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7421 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 7422 // If this is a deleted function, add it anyway. This might be conformant 7423 // with the standard. This might not. I'm not sure. It might not matter. 7424 // In particular, the problem is that this function never gets called. It 7425 // might just be ill-formed because this function attempts to refer to 7426 // a deleted function here. 7427 if (Constructor) 7428 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 7429 } 7430 } 7431 7432 return ExceptSpec; 7433} 7434 7435namespace { 7436/// RAII object to register a special member as being currently declared. 7437struct DeclaringSpecialMember { 7438 Sema &S; 7439 Sema::SpecialMemberDecl D; 7440 bool WasAlreadyBeingDeclared; 7441 7442 DeclaringSpecialMember(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM) 7443 : S(S), D(RD, CSM) { 7444 WasAlreadyBeingDeclared = !S.SpecialMembersBeingDeclared.insert(D); 7445 if (WasAlreadyBeingDeclared) 7446 // This almost never happens, but if it does, ensure that our cache 7447 // doesn't contain a stale result. 7448 S.SpecialMemberCache.clear(); 7449 7450 // FIXME: Register a note to be produced if we encounter an error while 7451 // declaring the special member. 7452 } 7453 ~DeclaringSpecialMember() { 7454 if (!WasAlreadyBeingDeclared) 7455 S.SpecialMembersBeingDeclared.erase(D); 7456 } 7457 7458 /// \brief Are we already trying to declare this special member? 7459 bool isAlreadyBeingDeclared() const { 7460 return WasAlreadyBeingDeclared; 7461 } 7462}; 7463} 7464 7465CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 7466 CXXRecordDecl *ClassDecl) { 7467 // C++ [class.ctor]p5: 7468 // A default constructor for a class X is a constructor of class X 7469 // that can be called without an argument. If there is no 7470 // user-declared constructor for class X, a default constructor is 7471 // implicitly declared. An implicitly-declared default constructor 7472 // is an inline public member of its class. 7473 assert(ClassDecl->needsImplicitDefaultConstructor() && 7474 "Should not build implicit default constructor!"); 7475 7476 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDefaultConstructor); 7477 if (DSM.isAlreadyBeingDeclared()) 7478 return 0; 7479 7480 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 7481 CXXDefaultConstructor, 7482 false); 7483 7484 // Create the actual constructor declaration. 7485 CanQualType ClassType 7486 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7487 SourceLocation ClassLoc = ClassDecl->getLocation(); 7488 DeclarationName Name 7489 = Context.DeclarationNames.getCXXConstructorName(ClassType); 7490 DeclarationNameInfo NameInfo(Name, ClassLoc); 7491 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 7492 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 7493 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 7494 Constexpr); 7495 DefaultCon->setAccess(AS_public); 7496 DefaultCon->setDefaulted(); 7497 DefaultCon->setImplicit(); 7498 7499 // Build an exception specification pointing back at this constructor. 7500 FunctionProtoType::ExtProtoInfo EPI; 7501 EPI.ExceptionSpecType = EST_Unevaluated; 7502 EPI.ExceptionSpecDecl = DefaultCon; 7503 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7504 7505 // We don't need to use SpecialMemberIsTrivial here; triviality for default 7506 // constructors is easy to compute. 7507 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 7508 7509 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 7510 DefaultCon->setDeletedAsWritten(); 7511 7512 // Note that we have declared this constructor. 7513 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 7514 7515 if (Scope *S = getScopeForContext(ClassDecl)) 7516 PushOnScopeChains(DefaultCon, S, false); 7517 ClassDecl->addDecl(DefaultCon); 7518 7519 return DefaultCon; 7520} 7521 7522void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 7523 CXXConstructorDecl *Constructor) { 7524 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 7525 !Constructor->doesThisDeclarationHaveABody() && 7526 !Constructor->isDeleted()) && 7527 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 7528 7529 CXXRecordDecl *ClassDecl = Constructor->getParent(); 7530 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 7531 7532 SynthesizedFunctionScope Scope(*this, Constructor); 7533 DiagnosticErrorTrap Trap(Diags); 7534 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 7535 Trap.hasErrorOccurred()) { 7536 Diag(CurrentLocation, diag::note_member_synthesized_at) 7537 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 7538 Constructor->setInvalidDecl(); 7539 return; 7540 } 7541 7542 SourceLocation Loc = Constructor->getLocation(); 7543 Constructor->setBody(new (Context) CompoundStmt(Loc)); 7544 7545 Constructor->setUsed(); 7546 MarkVTableUsed(CurrentLocation, ClassDecl); 7547 7548 if (ASTMutationListener *L = getASTMutationListener()) { 7549 L->CompletedImplicitDefinition(Constructor); 7550 } 7551} 7552 7553void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 7554 // Check that any explicitly-defaulted methods have exception specifications 7555 // compatible with their implicit exception specifications. 7556 CheckDelayedExplicitlyDefaultedMemberExceptionSpecs(); 7557} 7558 7559void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 7560 // We start with an initial pass over the base classes to collect those that 7561 // inherit constructors from. If there are none, we can forgo all further 7562 // processing. 7563 typedef SmallVector<const RecordType *, 4> BasesVector; 7564 BasesVector BasesToInheritFrom; 7565 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 7566 BaseE = ClassDecl->bases_end(); 7567 BaseIt != BaseE; ++BaseIt) { 7568 if (BaseIt->getInheritConstructors()) { 7569 QualType Base = BaseIt->getType(); 7570 if (Base->isDependentType()) { 7571 // If we inherit constructors from anything that is dependent, just 7572 // abort processing altogether. We'll get another chance for the 7573 // instantiations. 7574 return; 7575 } 7576 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 7577 } 7578 } 7579 if (BasesToInheritFrom.empty()) 7580 return; 7581 7582 // Now collect the constructors that we already have in the current class. 7583 // Those take precedence over inherited constructors. 7584 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7585 // unless there is a user-declared constructor with the same signature in 7586 // the class where the using-declaration appears. 7587 llvm::SmallSet<const Type *, 8> ExistingConstructors; 7588 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 7589 CtorE = ClassDecl->ctor_end(); 7590 CtorIt != CtorE; ++CtorIt) { 7591 ExistingConstructors.insert( 7592 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 7593 } 7594 7595 DeclarationName CreatedCtorName = 7596 Context.DeclarationNames.getCXXConstructorName( 7597 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 7598 7599 // Now comes the true work. 7600 // First, we keep a map from constructor types to the base that introduced 7601 // them. Needed for finding conflicting constructors. We also keep the 7602 // actually inserted declarations in there, for pretty diagnostics. 7603 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 7604 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 7605 ConstructorToSourceMap InheritedConstructors; 7606 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 7607 BaseE = BasesToInheritFrom.end(); 7608 BaseIt != BaseE; ++BaseIt) { 7609 const RecordType *Base = *BaseIt; 7610 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 7611 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 7612 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 7613 CtorE = BaseDecl->ctor_end(); 7614 CtorIt != CtorE; ++CtorIt) { 7615 // Find the using declaration for inheriting this base's constructors. 7616 // FIXME: Don't perform name lookup just to obtain a source location! 7617 DeclarationName Name = 7618 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7619 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 7620 LookupQualifiedName(Result, CurContext); 7621 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 7622 SourceLocation UsingLoc = UD ? UD->getLocation() : 7623 ClassDecl->getLocation(); 7624 7625 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 7626 // from the class X named in the using-declaration consists of actual 7627 // constructors and notional constructors that result from the 7628 // transformation of defaulted parameters as follows: 7629 // - all non-template default constructors of X, and 7630 // - for each non-template constructor of X that has at least one 7631 // parameter with a default argument, the set of constructors that 7632 // results from omitting any ellipsis parameter specification and 7633 // successively omitting parameters with a default argument from the 7634 // end of the parameter-type-list. 7635 CXXConstructorDecl *BaseCtor = *CtorIt; 7636 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7637 const FunctionProtoType *BaseCtorType = 7638 BaseCtor->getType()->getAs<FunctionProtoType>(); 7639 7640 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7641 maxParams = BaseCtor->getNumParams(); 7642 params <= maxParams; ++params) { 7643 // Skip default constructors. They're never inherited. 7644 if (params == 0) 7645 continue; 7646 // Skip copy and move constructors for the same reason. 7647 if (CanBeCopyOrMove && params == 1) 7648 continue; 7649 7650 // Build up a function type for this particular constructor. 7651 // FIXME: The working paper does not consider that the exception spec 7652 // for the inheriting constructor might be larger than that of the 7653 // source. This code doesn't yet, either. When it does, this code will 7654 // need to be delayed until after exception specifications and in-class 7655 // member initializers are attached. 7656 const Type *NewCtorType; 7657 if (params == maxParams) 7658 NewCtorType = BaseCtorType; 7659 else { 7660 SmallVector<QualType, 16> Args; 7661 for (unsigned i = 0; i < params; ++i) { 7662 Args.push_back(BaseCtorType->getArgType(i)); 7663 } 7664 FunctionProtoType::ExtProtoInfo ExtInfo = 7665 BaseCtorType->getExtProtoInfo(); 7666 ExtInfo.Variadic = false; 7667 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7668 Args.data(), params, ExtInfo) 7669 .getTypePtr(); 7670 } 7671 const Type *CanonicalNewCtorType = 7672 Context.getCanonicalType(NewCtorType); 7673 7674 // Now that we have the type, first check if the class already has a 7675 // constructor with this signature. 7676 if (ExistingConstructors.count(CanonicalNewCtorType)) 7677 continue; 7678 7679 // Then we check if we have already declared an inherited constructor 7680 // with this signature. 7681 std::pair<ConstructorToSourceMap::iterator, bool> result = 7682 InheritedConstructors.insert(std::make_pair( 7683 CanonicalNewCtorType, 7684 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7685 if (!result.second) { 7686 // Already in the map. If it came from a different class, that's an 7687 // error. Not if it's from the same. 7688 CanQualType PreviousBase = result.first->second.first; 7689 if (CanonicalBase != PreviousBase) { 7690 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7691 const CXXConstructorDecl *PrevBaseCtor = 7692 PrevCtor->getInheritedConstructor(); 7693 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7694 7695 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7696 Diag(BaseCtor->getLocation(), 7697 diag::note_using_decl_constructor_conflict_current_ctor); 7698 Diag(PrevBaseCtor->getLocation(), 7699 diag::note_using_decl_constructor_conflict_previous_ctor); 7700 Diag(PrevCtor->getLocation(), 7701 diag::note_using_decl_constructor_conflict_previous_using); 7702 } 7703 continue; 7704 } 7705 7706 // OK, we're there, now add the constructor. 7707 // C++0x [class.inhctor]p8: [...] that would be performed by a 7708 // user-written inline constructor [...] 7709 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7710 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7711 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7712 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7713 /*ImplicitlyDeclared=*/true, 7714 // FIXME: Due to a defect in the standard, we treat inherited 7715 // constructors as constexpr even if that makes them ill-formed. 7716 /*Constexpr=*/BaseCtor->isConstexpr()); 7717 NewCtor->setAccess(BaseCtor->getAccess()); 7718 7719 // Build up the parameter decls and add them. 7720 SmallVector<ParmVarDecl *, 16> ParamDecls; 7721 for (unsigned i = 0; i < params; ++i) { 7722 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7723 UsingLoc, UsingLoc, 7724 /*IdentifierInfo=*/0, 7725 BaseCtorType->getArgType(i), 7726 /*TInfo=*/0, SC_None, 7727 SC_None, /*DefaultArg=*/0)); 7728 } 7729 NewCtor->setParams(ParamDecls); 7730 NewCtor->setInheritedConstructor(BaseCtor); 7731 7732 ClassDecl->addDecl(NewCtor); 7733 result.first->second.second = NewCtor; 7734 } 7735 } 7736 } 7737} 7738 7739Sema::ImplicitExceptionSpecification 7740Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 7741 CXXRecordDecl *ClassDecl = MD->getParent(); 7742 7743 // C++ [except.spec]p14: 7744 // An implicitly declared special member function (Clause 12) shall have 7745 // an exception-specification. 7746 ImplicitExceptionSpecification ExceptSpec(*this); 7747 if (ClassDecl->isInvalidDecl()) 7748 return ExceptSpec; 7749 7750 // Direct base-class destructors. 7751 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7752 BEnd = ClassDecl->bases_end(); 7753 B != BEnd; ++B) { 7754 if (B->isVirtual()) // Handled below. 7755 continue; 7756 7757 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7758 ExceptSpec.CalledDecl(B->getLocStart(), 7759 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7760 } 7761 7762 // Virtual base-class destructors. 7763 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7764 BEnd = ClassDecl->vbases_end(); 7765 B != BEnd; ++B) { 7766 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7767 ExceptSpec.CalledDecl(B->getLocStart(), 7768 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7769 } 7770 7771 // Field destructors. 7772 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7773 FEnd = ClassDecl->field_end(); 7774 F != FEnd; ++F) { 7775 if (const RecordType *RecordTy 7776 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7777 ExceptSpec.CalledDecl(F->getLocation(), 7778 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7779 } 7780 7781 return ExceptSpec; 7782} 7783 7784CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7785 // C++ [class.dtor]p2: 7786 // If a class has no user-declared destructor, a destructor is 7787 // declared implicitly. An implicitly-declared destructor is an 7788 // inline public member of its class. 7789 assert(ClassDecl->needsImplicitDestructor()); 7790 7791 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDestructor); 7792 if (DSM.isAlreadyBeingDeclared()) 7793 return 0; 7794 7795 // Create the actual destructor declaration. 7796 CanQualType ClassType 7797 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7798 SourceLocation ClassLoc = ClassDecl->getLocation(); 7799 DeclarationName Name 7800 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7801 DeclarationNameInfo NameInfo(Name, ClassLoc); 7802 CXXDestructorDecl *Destructor 7803 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7804 QualType(), 0, /*isInline=*/true, 7805 /*isImplicitlyDeclared=*/true); 7806 Destructor->setAccess(AS_public); 7807 Destructor->setDefaulted(); 7808 Destructor->setImplicit(); 7809 7810 // Build an exception specification pointing back at this destructor. 7811 FunctionProtoType::ExtProtoInfo EPI; 7812 EPI.ExceptionSpecType = EST_Unevaluated; 7813 EPI.ExceptionSpecDecl = Destructor; 7814 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7815 7816 AddOverriddenMethods(ClassDecl, Destructor); 7817 7818 // We don't need to use SpecialMemberIsTrivial here; triviality for 7819 // destructors is easy to compute. 7820 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7821 7822 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7823 Destructor->setDeletedAsWritten(); 7824 7825 // Note that we have declared this destructor. 7826 ++ASTContext::NumImplicitDestructorsDeclared; 7827 7828 // Introduce this destructor into its scope. 7829 if (Scope *S = getScopeForContext(ClassDecl)) 7830 PushOnScopeChains(Destructor, S, false); 7831 ClassDecl->addDecl(Destructor); 7832 7833 return Destructor; 7834} 7835 7836void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7837 CXXDestructorDecl *Destructor) { 7838 assert((Destructor->isDefaulted() && 7839 !Destructor->doesThisDeclarationHaveABody() && 7840 !Destructor->isDeleted()) && 7841 "DefineImplicitDestructor - call it for implicit default dtor"); 7842 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7843 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7844 7845 if (Destructor->isInvalidDecl()) 7846 return; 7847 7848 SynthesizedFunctionScope Scope(*this, Destructor); 7849 7850 DiagnosticErrorTrap Trap(Diags); 7851 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7852 Destructor->getParent()); 7853 7854 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7855 Diag(CurrentLocation, diag::note_member_synthesized_at) 7856 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7857 7858 Destructor->setInvalidDecl(); 7859 return; 7860 } 7861 7862 SourceLocation Loc = Destructor->getLocation(); 7863 Destructor->setBody(new (Context) CompoundStmt(Loc)); 7864 Destructor->setImplicitlyDefined(true); 7865 Destructor->setUsed(); 7866 MarkVTableUsed(CurrentLocation, ClassDecl); 7867 7868 if (ASTMutationListener *L = getASTMutationListener()) { 7869 L->CompletedImplicitDefinition(Destructor); 7870 } 7871} 7872 7873/// \brief Perform any semantic analysis which needs to be delayed until all 7874/// pending class member declarations have been parsed. 7875void Sema::ActOnFinishCXXMemberDecls() { 7876 // Perform any deferred checking of exception specifications for virtual 7877 // destructors. 7878 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 7879 i != e; ++i) { 7880 const CXXDestructorDecl *Dtor = 7881 DelayedDestructorExceptionSpecChecks[i].first; 7882 assert(!Dtor->getParent()->isDependentType() && 7883 "Should not ever add destructors of templates into the list."); 7884 CheckOverridingFunctionExceptionSpec(Dtor, 7885 DelayedDestructorExceptionSpecChecks[i].second); 7886 } 7887 DelayedDestructorExceptionSpecChecks.clear(); 7888} 7889 7890void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 7891 CXXDestructorDecl *Destructor) { 7892 assert(getLangOpts().CPlusPlus11 && 7893 "adjusting dtor exception specs was introduced in c++11"); 7894 7895 // C++11 [class.dtor]p3: 7896 // A declaration of a destructor that does not have an exception- 7897 // specification is implicitly considered to have the same exception- 7898 // specification as an implicit declaration. 7899 const FunctionProtoType *DtorType = Destructor->getType()-> 7900 getAs<FunctionProtoType>(); 7901 if (DtorType->hasExceptionSpec()) 7902 return; 7903 7904 // Replace the destructor's type, building off the existing one. Fortunately, 7905 // the only thing of interest in the destructor type is its extended info. 7906 // The return and arguments are fixed. 7907 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 7908 EPI.ExceptionSpecType = EST_Unevaluated; 7909 EPI.ExceptionSpecDecl = Destructor; 7910 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7911 7912 // FIXME: If the destructor has a body that could throw, and the newly created 7913 // spec doesn't allow exceptions, we should emit a warning, because this 7914 // change in behavior can break conforming C++03 programs at runtime. 7915 // However, we don't have a body or an exception specification yet, so it 7916 // needs to be done somewhere else. 7917} 7918 7919/// When generating a defaulted copy or move assignment operator, if a field 7920/// should be copied with __builtin_memcpy rather than via explicit assignments, 7921/// do so. This optimization only applies for arrays of scalars, and for arrays 7922/// of class type where the selected copy/move-assignment operator is trivial. 7923static StmtResult 7924buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T, 7925 Expr *To, Expr *From) { 7926 // Compute the size of the memory buffer to be copied. 7927 QualType SizeType = S.Context.getSizeType(); 7928 llvm::APInt Size(S.Context.getTypeSize(SizeType), 7929 S.Context.getTypeSizeInChars(T).getQuantity()); 7930 7931 // Take the address of the field references for "from" and "to". We 7932 // directly construct UnaryOperators here because semantic analysis 7933 // does not permit us to take the address of an xvalue. 7934 From = new (S.Context) UnaryOperator(From, UO_AddrOf, 7935 S.Context.getPointerType(From->getType()), 7936 VK_RValue, OK_Ordinary, Loc); 7937 To = new (S.Context) UnaryOperator(To, UO_AddrOf, 7938 S.Context.getPointerType(To->getType()), 7939 VK_RValue, OK_Ordinary, Loc); 7940 7941 const Type *E = T->getBaseElementTypeUnsafe(); 7942 bool NeedsCollectableMemCpy = 7943 E->isRecordType() && E->getAs<RecordType>()->getDecl()->hasObjectMember(); 7944 7945 // Create a reference to the __builtin_objc_memmove_collectable function 7946 StringRef MemCpyName = NeedsCollectableMemCpy ? 7947 "__builtin_objc_memmove_collectable" : 7948 "__builtin_memcpy"; 7949 LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc, 7950 Sema::LookupOrdinaryName); 7951 S.LookupName(R, S.TUScope, true); 7952 7953 FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>(); 7954 if (!MemCpy) 7955 // Something went horribly wrong earlier, and we will have complained 7956 // about it. 7957 return StmtError(); 7958 7959 ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy, 7960 VK_RValue, Loc, 0); 7961 assert(MemCpyRef.isUsable() && "Builtin reference cannot fail"); 7962 7963 Expr *CallArgs[] = { 7964 To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc) 7965 }; 7966 ExprResult Call = S.ActOnCallExpr(/*Scope=*/0, MemCpyRef.take(), 7967 Loc, CallArgs, Loc); 7968 7969 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7970 return S.Owned(Call.takeAs<Stmt>()); 7971} 7972 7973/// \brief Builds a statement that copies/moves the given entity from \p From to 7974/// \c To. 7975/// 7976/// This routine is used to copy/move the members of a class with an 7977/// implicitly-declared copy/move assignment operator. When the entities being 7978/// copied are arrays, this routine builds for loops to copy them. 7979/// 7980/// \param S The Sema object used for type-checking. 7981/// 7982/// \param Loc The location where the implicit copy/move is being generated. 7983/// 7984/// \param T The type of the expressions being copied/moved. Both expressions 7985/// must have this type. 7986/// 7987/// \param To The expression we are copying/moving to. 7988/// 7989/// \param From The expression we are copying/moving from. 7990/// 7991/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7992/// Otherwise, it's a non-static member subobject. 7993/// 7994/// \param Copying Whether we're copying or moving. 7995/// 7996/// \param Depth Internal parameter recording the depth of the recursion. 7997/// 7998/// \returns A statement or a loop that copies the expressions, or StmtResult(0) 7999/// if a memcpy should be used instead. 8000static StmtResult 8001buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T, 8002 Expr *To, Expr *From, 8003 bool CopyingBaseSubobject, bool Copying, 8004 unsigned Depth = 0) { 8005 // C++11 [class.copy]p28: 8006 // Each subobject is assigned in the manner appropriate to its type: 8007 // 8008 // - if the subobject is of class type, as if by a call to operator= with 8009 // the subobject as the object expression and the corresponding 8010 // subobject of x as a single function argument (as if by explicit 8011 // qualification; that is, ignoring any possible virtual overriding 8012 // functions in more derived classes); 8013 // 8014 // C++03 [class.copy]p13: 8015 // - if the subobject is of class type, the copy assignment operator for 8016 // the class is used (as if by explicit qualification; that is, 8017 // ignoring any possible virtual overriding functions in more derived 8018 // classes); 8019 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 8020 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8021 8022 // Look for operator=. 8023 DeclarationName Name 8024 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8025 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 8026 S.LookupQualifiedName(OpLookup, ClassDecl, false); 8027 8028 // Prior to C++11, filter out any result that isn't a copy/move-assignment 8029 // operator. 8030 if (!S.getLangOpts().CPlusPlus11) { 8031 LookupResult::Filter F = OpLookup.makeFilter(); 8032 while (F.hasNext()) { 8033 NamedDecl *D = F.next(); 8034 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 8035 if (Method->isCopyAssignmentOperator() || 8036 (!Copying && Method->isMoveAssignmentOperator())) 8037 continue; 8038 8039 F.erase(); 8040 } 8041 F.done(); 8042 } 8043 8044 // Suppress the protected check (C++ [class.protected]) for each of the 8045 // assignment operators we found. This strange dance is required when 8046 // we're assigning via a base classes's copy-assignment operator. To 8047 // ensure that we're getting the right base class subobject (without 8048 // ambiguities), we need to cast "this" to that subobject type; to 8049 // ensure that we don't go through the virtual call mechanism, we need 8050 // to qualify the operator= name with the base class (see below). However, 8051 // this means that if the base class has a protected copy assignment 8052 // operator, the protected member access check will fail. So, we 8053 // rewrite "protected" access to "public" access in this case, since we 8054 // know by construction that we're calling from a derived class. 8055 if (CopyingBaseSubobject) { 8056 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 8057 L != LEnd; ++L) { 8058 if (L.getAccess() == AS_protected) 8059 L.setAccess(AS_public); 8060 } 8061 } 8062 8063 // Create the nested-name-specifier that will be used to qualify the 8064 // reference to operator=; this is required to suppress the virtual 8065 // call mechanism. 8066 CXXScopeSpec SS; 8067 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 8068 SS.MakeTrivial(S.Context, 8069 NestedNameSpecifier::Create(S.Context, 0, false, 8070 CanonicalT), 8071 Loc); 8072 8073 // Create the reference to operator=. 8074 ExprResult OpEqualRef 8075 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 8076 /*TemplateKWLoc=*/SourceLocation(), 8077 /*FirstQualifierInScope=*/0, 8078 OpLookup, 8079 /*TemplateArgs=*/0, 8080 /*SuppressQualifierCheck=*/true); 8081 if (OpEqualRef.isInvalid()) 8082 return StmtError(); 8083 8084 // Build the call to the assignment operator. 8085 8086 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 8087 OpEqualRef.takeAs<Expr>(), 8088 Loc, &From, 1, Loc); 8089 if (Call.isInvalid()) 8090 return StmtError(); 8091 8092 // If we built a call to a trivial 'operator=' while copying an array, 8093 // bail out. We'll replace the whole shebang with a memcpy. 8094 CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get()); 8095 if (CE && CE->getMethodDecl()->isTrivial() && Depth) 8096 return StmtResult((Stmt*)0); 8097 8098 // Convert to an expression-statement, and clean up any produced 8099 // temporaries. 8100 return S.ActOnExprStmt(S.MakeFullExpr(Call.take(), Loc)); 8101 } 8102 8103 // - if the subobject is of scalar type, the built-in assignment 8104 // operator is used. 8105 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 8106 if (!ArrayTy) { 8107 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 8108 if (Assignment.isInvalid()) 8109 return StmtError(); 8110 return S.ActOnExprStmt(S.MakeFullExpr(Assignment.take(), Loc)); 8111 } 8112 8113 // - if the subobject is an array, each element is assigned, in the 8114 // manner appropriate to the element type; 8115 8116 // Construct a loop over the array bounds, e.g., 8117 // 8118 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 8119 // 8120 // that will copy each of the array elements. 8121 QualType SizeType = S.Context.getSizeType(); 8122 8123 // Create the iteration variable. 8124 IdentifierInfo *IterationVarName = 0; 8125 { 8126 SmallString<8> Str; 8127 llvm::raw_svector_ostream OS(Str); 8128 OS << "__i" << Depth; 8129 IterationVarName = &S.Context.Idents.get(OS.str()); 8130 } 8131 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 8132 IterationVarName, SizeType, 8133 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 8134 SC_None, SC_None); 8135 8136 // Initialize the iteration variable to zero. 8137 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 8138 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 8139 8140 // Create a reference to the iteration variable; we'll use this several 8141 // times throughout. 8142 Expr *IterationVarRef 8143 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 8144 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 8145 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 8146 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 8147 8148 // Create the DeclStmt that holds the iteration variable. 8149 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 8150 8151 // Subscript the "from" and "to" expressions with the iteration variable. 8152 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 8153 IterationVarRefRVal, 8154 Loc)); 8155 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 8156 IterationVarRefRVal, 8157 Loc)); 8158 if (!Copying) // Cast to rvalue 8159 From = CastForMoving(S, From); 8160 8161 // Build the copy/move for an individual element of the array. 8162 StmtResult Copy = 8163 buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(), 8164 To, From, CopyingBaseSubobject, 8165 Copying, Depth + 1); 8166 // Bail out if copying fails or if we determined that we should use memcpy. 8167 if (Copy.isInvalid() || !Copy.get()) 8168 return Copy; 8169 8170 // Create the comparison against the array bound. 8171 llvm::APInt Upper 8172 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 8173 Expr *Comparison 8174 = new (S.Context) BinaryOperator(IterationVarRefRVal, 8175 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 8176 BO_NE, S.Context.BoolTy, 8177 VK_RValue, OK_Ordinary, Loc, false); 8178 8179 // Create the pre-increment of the iteration variable. 8180 Expr *Increment 8181 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 8182 VK_LValue, OK_Ordinary, Loc); 8183 8184 // Construct the loop that copies all elements of this array. 8185 return S.ActOnForStmt(Loc, Loc, InitStmt, 8186 S.MakeFullExpr(Comparison), 8187 0, S.MakeFullExpr(Increment), 8188 Loc, Copy.take()); 8189} 8190 8191static StmtResult 8192buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 8193 Expr *To, Expr *From, 8194 bool CopyingBaseSubobject, bool Copying) { 8195 // Maybe we should use a memcpy? 8196 if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() && 8197 T.isTriviallyCopyableType(S.Context)) 8198 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 8199 8200 StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From, 8201 CopyingBaseSubobject, 8202 Copying, 0)); 8203 8204 // If we ended up picking a trivial assignment operator for an array of a 8205 // non-trivially-copyable class type, just emit a memcpy. 8206 if (!Result.isInvalid() && !Result.get()) 8207 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 8208 8209 return Result; 8210} 8211 8212Sema::ImplicitExceptionSpecification 8213Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 8214 CXXRecordDecl *ClassDecl = MD->getParent(); 8215 8216 ImplicitExceptionSpecification ExceptSpec(*this); 8217 if (ClassDecl->isInvalidDecl()) 8218 return ExceptSpec; 8219 8220 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 8221 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 8222 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 8223 8224 // C++ [except.spec]p14: 8225 // An implicitly declared special member function (Clause 12) shall have an 8226 // exception-specification. [...] 8227 8228 // It is unspecified whether or not an implicit copy assignment operator 8229 // attempts to deduplicate calls to assignment operators of virtual bases are 8230 // made. As such, this exception specification is effectively unspecified. 8231 // Based on a similar decision made for constness in C++0x, we're erring on 8232 // the side of assuming such calls to be made regardless of whether they 8233 // actually happen. 8234 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8235 BaseEnd = ClassDecl->bases_end(); 8236 Base != BaseEnd; ++Base) { 8237 if (Base->isVirtual()) 8238 continue; 8239 8240 CXXRecordDecl *BaseClassDecl 8241 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8242 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 8243 ArgQuals, false, 0)) 8244 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 8245 } 8246 8247 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8248 BaseEnd = ClassDecl->vbases_end(); 8249 Base != BaseEnd; ++Base) { 8250 CXXRecordDecl *BaseClassDecl 8251 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8252 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 8253 ArgQuals, false, 0)) 8254 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 8255 } 8256 8257 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8258 FieldEnd = ClassDecl->field_end(); 8259 Field != FieldEnd; 8260 ++Field) { 8261 QualType FieldType = Context.getBaseElementType(Field->getType()); 8262 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8263 if (CXXMethodDecl *CopyAssign = 8264 LookupCopyingAssignment(FieldClassDecl, 8265 ArgQuals | FieldType.getCVRQualifiers(), 8266 false, 0)) 8267 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 8268 } 8269 } 8270 8271 return ExceptSpec; 8272} 8273 8274CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 8275 // Note: The following rules are largely analoguous to the copy 8276 // constructor rules. Note that virtual bases are not taken into account 8277 // for determining the argument type of the operator. Note also that 8278 // operators taking an object instead of a reference are allowed. 8279 assert(ClassDecl->needsImplicitCopyAssignment()); 8280 8281 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyAssignment); 8282 if (DSM.isAlreadyBeingDeclared()) 8283 return 0; 8284 8285 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8286 QualType RetType = Context.getLValueReferenceType(ArgType); 8287 if (ClassDecl->implicitCopyAssignmentHasConstParam()) 8288 ArgType = ArgType.withConst(); 8289 ArgType = Context.getLValueReferenceType(ArgType); 8290 8291 // An implicitly-declared copy assignment operator is an inline public 8292 // member of its class. 8293 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8294 SourceLocation ClassLoc = ClassDecl->getLocation(); 8295 DeclarationNameInfo NameInfo(Name, ClassLoc); 8296 CXXMethodDecl *CopyAssignment 8297 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8298 /*TInfo=*/0, /*isStatic=*/false, 8299 /*StorageClassAsWritten=*/SC_None, 8300 /*isInline=*/true, /*isConstexpr=*/false, 8301 SourceLocation()); 8302 CopyAssignment->setAccess(AS_public); 8303 CopyAssignment->setDefaulted(); 8304 CopyAssignment->setImplicit(); 8305 8306 // Build an exception specification pointing back at this member. 8307 FunctionProtoType::ExtProtoInfo EPI; 8308 EPI.ExceptionSpecType = EST_Unevaluated; 8309 EPI.ExceptionSpecDecl = CopyAssignment; 8310 CopyAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 8311 8312 // Add the parameter to the operator. 8313 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 8314 ClassLoc, ClassLoc, /*Id=*/0, 8315 ArgType, /*TInfo=*/0, 8316 SC_None, 8317 SC_None, 0); 8318 CopyAssignment->setParams(FromParam); 8319 8320 AddOverriddenMethods(ClassDecl, CopyAssignment); 8321 8322 CopyAssignment->setTrivial( 8323 ClassDecl->needsOverloadResolutionForCopyAssignment() 8324 ? SpecialMemberIsTrivial(CopyAssignment, CXXCopyAssignment) 8325 : ClassDecl->hasTrivialCopyAssignment()); 8326 8327 // C++0x [class.copy]p19: 8328 // .... If the class definition does not explicitly declare a copy 8329 // assignment operator, there is no user-declared move constructor, and 8330 // there is no user-declared move assignment operator, a copy assignment 8331 // operator is implicitly declared as defaulted. 8332 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 8333 CopyAssignment->setDeletedAsWritten(); 8334 8335 // Note that we have added this copy-assignment operator. 8336 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 8337 8338 if (Scope *S = getScopeForContext(ClassDecl)) 8339 PushOnScopeChains(CopyAssignment, S, false); 8340 ClassDecl->addDecl(CopyAssignment); 8341 8342 return CopyAssignment; 8343} 8344 8345void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 8346 CXXMethodDecl *CopyAssignOperator) { 8347 assert((CopyAssignOperator->isDefaulted() && 8348 CopyAssignOperator->isOverloadedOperator() && 8349 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 8350 !CopyAssignOperator->doesThisDeclarationHaveABody() && 8351 !CopyAssignOperator->isDeleted()) && 8352 "DefineImplicitCopyAssignment called for wrong function"); 8353 8354 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 8355 8356 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 8357 CopyAssignOperator->setInvalidDecl(); 8358 return; 8359 } 8360 8361 CopyAssignOperator->setUsed(); 8362 8363 SynthesizedFunctionScope Scope(*this, CopyAssignOperator); 8364 DiagnosticErrorTrap Trap(Diags); 8365 8366 // C++0x [class.copy]p30: 8367 // The implicitly-defined or explicitly-defaulted copy assignment operator 8368 // for a non-union class X performs memberwise copy assignment of its 8369 // subobjects. The direct base classes of X are assigned first, in the 8370 // order of their declaration in the base-specifier-list, and then the 8371 // immediate non-static data members of X are assigned, in the order in 8372 // which they were declared in the class definition. 8373 8374 // The statements that form the synthesized function body. 8375 SmallVector<Stmt*, 8> Statements; 8376 8377 // The parameter for the "other" object, which we are copying from. 8378 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 8379 Qualifiers OtherQuals = Other->getType().getQualifiers(); 8380 QualType OtherRefType = Other->getType(); 8381 if (const LValueReferenceType *OtherRef 8382 = OtherRefType->getAs<LValueReferenceType>()) { 8383 OtherRefType = OtherRef->getPointeeType(); 8384 OtherQuals = OtherRefType.getQualifiers(); 8385 } 8386 8387 // Our location for everything implicitly-generated. 8388 SourceLocation Loc = CopyAssignOperator->getLocation(); 8389 8390 // Construct a reference to the "other" object. We'll be using this 8391 // throughout the generated ASTs. 8392 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8393 assert(OtherRef && "Reference to parameter cannot fail!"); 8394 8395 // Construct the "this" pointer. We'll be using this throughout the generated 8396 // ASTs. 8397 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8398 assert(This && "Reference to this cannot fail!"); 8399 8400 // Assign base classes. 8401 bool Invalid = false; 8402 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8403 E = ClassDecl->bases_end(); Base != E; ++Base) { 8404 // Form the assignment: 8405 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 8406 QualType BaseType = Base->getType().getUnqualifiedType(); 8407 if (!BaseType->isRecordType()) { 8408 Invalid = true; 8409 continue; 8410 } 8411 8412 CXXCastPath BasePath; 8413 BasePath.push_back(Base); 8414 8415 // Construct the "from" expression, which is an implicit cast to the 8416 // appropriately-qualified base type. 8417 Expr *From = OtherRef; 8418 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 8419 CK_UncheckedDerivedToBase, 8420 VK_LValue, &BasePath).take(); 8421 8422 // Dereference "this". 8423 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8424 8425 // Implicitly cast "this" to the appropriately-qualified base type. 8426 To = ImpCastExprToType(To.take(), 8427 Context.getCVRQualifiedType(BaseType, 8428 CopyAssignOperator->getTypeQualifiers()), 8429 CK_UncheckedDerivedToBase, 8430 VK_LValue, &BasePath); 8431 8432 // Build the copy. 8433 StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType, 8434 To.get(), From, 8435 /*CopyingBaseSubobject=*/true, 8436 /*Copying=*/true); 8437 if (Copy.isInvalid()) { 8438 Diag(CurrentLocation, diag::note_member_synthesized_at) 8439 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8440 CopyAssignOperator->setInvalidDecl(); 8441 return; 8442 } 8443 8444 // Success! Record the copy. 8445 Statements.push_back(Copy.takeAs<Expr>()); 8446 } 8447 8448 // Assign non-static members. 8449 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8450 FieldEnd = ClassDecl->field_end(); 8451 Field != FieldEnd; ++Field) { 8452 if (Field->isUnnamedBitfield()) 8453 continue; 8454 8455 // Check for members of reference type; we can't copy those. 8456 if (Field->getType()->isReferenceType()) { 8457 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8458 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8459 Diag(Field->getLocation(), diag::note_declared_at); 8460 Diag(CurrentLocation, diag::note_member_synthesized_at) 8461 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8462 Invalid = true; 8463 continue; 8464 } 8465 8466 // Check for members of const-qualified, non-class type. 8467 QualType BaseType = Context.getBaseElementType(Field->getType()); 8468 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8469 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8470 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8471 Diag(Field->getLocation(), diag::note_declared_at); 8472 Diag(CurrentLocation, diag::note_member_synthesized_at) 8473 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8474 Invalid = true; 8475 continue; 8476 } 8477 8478 // Suppress assigning zero-width bitfields. 8479 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8480 continue; 8481 8482 QualType FieldType = Field->getType().getNonReferenceType(); 8483 if (FieldType->isIncompleteArrayType()) { 8484 assert(ClassDecl->hasFlexibleArrayMember() && 8485 "Incomplete array type is not valid"); 8486 continue; 8487 } 8488 8489 // Build references to the field in the object we're copying from and to. 8490 CXXScopeSpec SS; // Intentionally empty 8491 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8492 LookupMemberName); 8493 MemberLookup.addDecl(*Field); 8494 MemberLookup.resolveKind(); 8495 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8496 Loc, /*IsArrow=*/false, 8497 SS, SourceLocation(), 0, 8498 MemberLookup, 0); 8499 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8500 Loc, /*IsArrow=*/true, 8501 SS, SourceLocation(), 0, 8502 MemberLookup, 0); 8503 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8504 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8505 8506 // Build the copy of this field. 8507 StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType, 8508 To.get(), From.get(), 8509 /*CopyingBaseSubobject=*/false, 8510 /*Copying=*/true); 8511 if (Copy.isInvalid()) { 8512 Diag(CurrentLocation, diag::note_member_synthesized_at) 8513 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8514 CopyAssignOperator->setInvalidDecl(); 8515 return; 8516 } 8517 8518 // Success! Record the copy. 8519 Statements.push_back(Copy.takeAs<Stmt>()); 8520 } 8521 8522 if (!Invalid) { 8523 // Add a "return *this;" 8524 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8525 8526 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8527 if (Return.isInvalid()) 8528 Invalid = true; 8529 else { 8530 Statements.push_back(Return.takeAs<Stmt>()); 8531 8532 if (Trap.hasErrorOccurred()) { 8533 Diag(CurrentLocation, diag::note_member_synthesized_at) 8534 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8535 Invalid = true; 8536 } 8537 } 8538 } 8539 8540 if (Invalid) { 8541 CopyAssignOperator->setInvalidDecl(); 8542 return; 8543 } 8544 8545 StmtResult Body; 8546 { 8547 CompoundScopeRAII CompoundScope(*this); 8548 Body = ActOnCompoundStmt(Loc, Loc, Statements, 8549 /*isStmtExpr=*/false); 8550 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8551 } 8552 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 8553 8554 if (ASTMutationListener *L = getASTMutationListener()) { 8555 L->CompletedImplicitDefinition(CopyAssignOperator); 8556 } 8557} 8558 8559Sema::ImplicitExceptionSpecification 8560Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 8561 CXXRecordDecl *ClassDecl = MD->getParent(); 8562 8563 ImplicitExceptionSpecification ExceptSpec(*this); 8564 if (ClassDecl->isInvalidDecl()) 8565 return ExceptSpec; 8566 8567 // C++0x [except.spec]p14: 8568 // An implicitly declared special member function (Clause 12) shall have an 8569 // exception-specification. [...] 8570 8571 // It is unspecified whether or not an implicit move assignment operator 8572 // attempts to deduplicate calls to assignment operators of virtual bases are 8573 // made. As such, this exception specification is effectively unspecified. 8574 // Based on a similar decision made for constness in C++0x, we're erring on 8575 // the side of assuming such calls to be made regardless of whether they 8576 // actually happen. 8577 // Note that a move constructor is not implicitly declared when there are 8578 // virtual bases, but it can still be user-declared and explicitly defaulted. 8579 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8580 BaseEnd = ClassDecl->bases_end(); 8581 Base != BaseEnd; ++Base) { 8582 if (Base->isVirtual()) 8583 continue; 8584 8585 CXXRecordDecl *BaseClassDecl 8586 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8587 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8588 0, false, 0)) 8589 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8590 } 8591 8592 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8593 BaseEnd = ClassDecl->vbases_end(); 8594 Base != BaseEnd; ++Base) { 8595 CXXRecordDecl *BaseClassDecl 8596 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8597 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8598 0, false, 0)) 8599 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8600 } 8601 8602 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8603 FieldEnd = ClassDecl->field_end(); 8604 Field != FieldEnd; 8605 ++Field) { 8606 QualType FieldType = Context.getBaseElementType(Field->getType()); 8607 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8608 if (CXXMethodDecl *MoveAssign = 8609 LookupMovingAssignment(FieldClassDecl, 8610 FieldType.getCVRQualifiers(), 8611 false, 0)) 8612 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 8613 } 8614 } 8615 8616 return ExceptSpec; 8617} 8618 8619/// Determine whether the class type has any direct or indirect virtual base 8620/// classes which have a non-trivial move assignment operator. 8621static bool 8622hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 8623 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8624 BaseEnd = ClassDecl->vbases_end(); 8625 Base != BaseEnd; ++Base) { 8626 CXXRecordDecl *BaseClass = 8627 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8628 8629 // Try to declare the move assignment. If it would be deleted, then the 8630 // class does not have a non-trivial move assignment. 8631 if (BaseClass->needsImplicitMoveAssignment()) 8632 S.DeclareImplicitMoveAssignment(BaseClass); 8633 8634 if (BaseClass->hasNonTrivialMoveAssignment()) 8635 return true; 8636 } 8637 8638 return false; 8639} 8640 8641/// Determine whether the given type either has a move constructor or is 8642/// trivially copyable. 8643static bool 8644hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8645 Type = S.Context.getBaseElementType(Type); 8646 8647 // FIXME: Technically, non-trivially-copyable non-class types, such as 8648 // reference types, are supposed to return false here, but that appears 8649 // to be a standard defect. 8650 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8651 if (!ClassDecl || !ClassDecl->getDefinition() || ClassDecl->isInvalidDecl()) 8652 return true; 8653 8654 if (Type.isTriviallyCopyableType(S.Context)) 8655 return true; 8656 8657 if (IsConstructor) { 8658 // FIXME: Need this because otherwise hasMoveConstructor isn't guaranteed to 8659 // give the right answer. 8660 if (ClassDecl->needsImplicitMoveConstructor()) 8661 S.DeclareImplicitMoveConstructor(ClassDecl); 8662 return ClassDecl->hasMoveConstructor(); 8663 } 8664 8665 // FIXME: Need this because otherwise hasMoveAssignment isn't guaranteed to 8666 // give the right answer. 8667 if (ClassDecl->needsImplicitMoveAssignment()) 8668 S.DeclareImplicitMoveAssignment(ClassDecl); 8669 return ClassDecl->hasMoveAssignment(); 8670} 8671 8672/// Determine whether all non-static data members and direct or virtual bases 8673/// of class \p ClassDecl have either a move operation, or are trivially 8674/// copyable. 8675static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8676 bool IsConstructor) { 8677 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8678 BaseEnd = ClassDecl->bases_end(); 8679 Base != BaseEnd; ++Base) { 8680 if (Base->isVirtual()) 8681 continue; 8682 8683 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8684 return false; 8685 } 8686 8687 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8688 BaseEnd = ClassDecl->vbases_end(); 8689 Base != BaseEnd; ++Base) { 8690 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8691 return false; 8692 } 8693 8694 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8695 FieldEnd = ClassDecl->field_end(); 8696 Field != FieldEnd; ++Field) { 8697 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 8698 return false; 8699 } 8700 8701 return true; 8702} 8703 8704CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8705 // C++11 [class.copy]p20: 8706 // If the definition of a class X does not explicitly declare a move 8707 // assignment operator, one will be implicitly declared as defaulted 8708 // if and only if: 8709 // 8710 // - [first 4 bullets] 8711 assert(ClassDecl->needsImplicitMoveAssignment()); 8712 8713 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveAssignment); 8714 if (DSM.isAlreadyBeingDeclared()) 8715 return 0; 8716 8717 // [Checked after we build the declaration] 8718 // - the move assignment operator would not be implicitly defined as 8719 // deleted, 8720 8721 // [DR1402]: 8722 // - X has no direct or indirect virtual base class with a non-trivial 8723 // move assignment operator, and 8724 // - each of X's non-static data members and direct or virtual base classes 8725 // has a type that either has a move assignment operator or is trivially 8726 // copyable. 8727 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8728 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8729 ClassDecl->setFailedImplicitMoveAssignment(); 8730 return 0; 8731 } 8732 8733 // Note: The following rules are largely analoguous to the move 8734 // constructor rules. 8735 8736 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8737 QualType RetType = Context.getLValueReferenceType(ArgType); 8738 ArgType = Context.getRValueReferenceType(ArgType); 8739 8740 // An implicitly-declared move assignment operator is an inline public 8741 // member of its class. 8742 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8743 SourceLocation ClassLoc = ClassDecl->getLocation(); 8744 DeclarationNameInfo NameInfo(Name, ClassLoc); 8745 CXXMethodDecl *MoveAssignment 8746 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8747 /*TInfo=*/0, /*isStatic=*/false, 8748 /*StorageClassAsWritten=*/SC_None, 8749 /*isInline=*/true, 8750 /*isConstexpr=*/false, 8751 SourceLocation()); 8752 MoveAssignment->setAccess(AS_public); 8753 MoveAssignment->setDefaulted(); 8754 MoveAssignment->setImplicit(); 8755 8756 // Build an exception specification pointing back at this member. 8757 FunctionProtoType::ExtProtoInfo EPI; 8758 EPI.ExceptionSpecType = EST_Unevaluated; 8759 EPI.ExceptionSpecDecl = MoveAssignment; 8760 MoveAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 8761 8762 // Add the parameter to the operator. 8763 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8764 ClassLoc, ClassLoc, /*Id=*/0, 8765 ArgType, /*TInfo=*/0, 8766 SC_None, 8767 SC_None, 0); 8768 MoveAssignment->setParams(FromParam); 8769 8770 AddOverriddenMethods(ClassDecl, MoveAssignment); 8771 8772 MoveAssignment->setTrivial( 8773 ClassDecl->needsOverloadResolutionForMoveAssignment() 8774 ? SpecialMemberIsTrivial(MoveAssignment, CXXMoveAssignment) 8775 : ClassDecl->hasTrivialMoveAssignment()); 8776 8777 // C++0x [class.copy]p9: 8778 // If the definition of a class X does not explicitly declare a move 8779 // assignment operator, one will be implicitly declared as defaulted if and 8780 // only if: 8781 // [...] 8782 // - the move assignment operator would not be implicitly defined as 8783 // deleted. 8784 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8785 // Cache this result so that we don't try to generate this over and over 8786 // on every lookup, leaking memory and wasting time. 8787 ClassDecl->setFailedImplicitMoveAssignment(); 8788 return 0; 8789 } 8790 8791 // Note that we have added this copy-assignment operator. 8792 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8793 8794 if (Scope *S = getScopeForContext(ClassDecl)) 8795 PushOnScopeChains(MoveAssignment, S, false); 8796 ClassDecl->addDecl(MoveAssignment); 8797 8798 return MoveAssignment; 8799} 8800 8801void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8802 CXXMethodDecl *MoveAssignOperator) { 8803 assert((MoveAssignOperator->isDefaulted() && 8804 MoveAssignOperator->isOverloadedOperator() && 8805 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8806 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8807 !MoveAssignOperator->isDeleted()) && 8808 "DefineImplicitMoveAssignment called for wrong function"); 8809 8810 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8811 8812 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8813 MoveAssignOperator->setInvalidDecl(); 8814 return; 8815 } 8816 8817 MoveAssignOperator->setUsed(); 8818 8819 SynthesizedFunctionScope Scope(*this, MoveAssignOperator); 8820 DiagnosticErrorTrap Trap(Diags); 8821 8822 // C++0x [class.copy]p28: 8823 // The implicitly-defined or move assignment operator for a non-union class 8824 // X performs memberwise move assignment of its subobjects. The direct base 8825 // classes of X are assigned first, in the order of their declaration in the 8826 // base-specifier-list, and then the immediate non-static data members of X 8827 // are assigned, in the order in which they were declared in the class 8828 // definition. 8829 8830 // The statements that form the synthesized function body. 8831 SmallVector<Stmt*, 8> Statements; 8832 8833 // The parameter for the "other" object, which we are move from. 8834 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8835 QualType OtherRefType = Other->getType()-> 8836 getAs<RValueReferenceType>()->getPointeeType(); 8837 assert(OtherRefType.getQualifiers() == 0 && 8838 "Bad argument type of defaulted move assignment"); 8839 8840 // Our location for everything implicitly-generated. 8841 SourceLocation Loc = MoveAssignOperator->getLocation(); 8842 8843 // Construct a reference to the "other" object. We'll be using this 8844 // throughout the generated ASTs. 8845 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8846 assert(OtherRef && "Reference to parameter cannot fail!"); 8847 // Cast to rvalue. 8848 OtherRef = CastForMoving(*this, OtherRef); 8849 8850 // Construct the "this" pointer. We'll be using this throughout the generated 8851 // ASTs. 8852 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8853 assert(This && "Reference to this cannot fail!"); 8854 8855 // Assign base classes. 8856 bool Invalid = false; 8857 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8858 E = ClassDecl->bases_end(); Base != E; ++Base) { 8859 // Form the assignment: 8860 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8861 QualType BaseType = Base->getType().getUnqualifiedType(); 8862 if (!BaseType->isRecordType()) { 8863 Invalid = true; 8864 continue; 8865 } 8866 8867 CXXCastPath BasePath; 8868 BasePath.push_back(Base); 8869 8870 // Construct the "from" expression, which is an implicit cast to the 8871 // appropriately-qualified base type. 8872 Expr *From = OtherRef; 8873 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8874 VK_XValue, &BasePath).take(); 8875 8876 // Dereference "this". 8877 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8878 8879 // Implicitly cast "this" to the appropriately-qualified base type. 8880 To = ImpCastExprToType(To.take(), 8881 Context.getCVRQualifiedType(BaseType, 8882 MoveAssignOperator->getTypeQualifiers()), 8883 CK_UncheckedDerivedToBase, 8884 VK_LValue, &BasePath); 8885 8886 // Build the move. 8887 StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType, 8888 To.get(), From, 8889 /*CopyingBaseSubobject=*/true, 8890 /*Copying=*/false); 8891 if (Move.isInvalid()) { 8892 Diag(CurrentLocation, diag::note_member_synthesized_at) 8893 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8894 MoveAssignOperator->setInvalidDecl(); 8895 return; 8896 } 8897 8898 // Success! Record the move. 8899 Statements.push_back(Move.takeAs<Expr>()); 8900 } 8901 8902 // Assign non-static members. 8903 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8904 FieldEnd = ClassDecl->field_end(); 8905 Field != FieldEnd; ++Field) { 8906 if (Field->isUnnamedBitfield()) 8907 continue; 8908 8909 // Check for members of reference type; we can't move those. 8910 if (Field->getType()->isReferenceType()) { 8911 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8912 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8913 Diag(Field->getLocation(), diag::note_declared_at); 8914 Diag(CurrentLocation, diag::note_member_synthesized_at) 8915 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8916 Invalid = true; 8917 continue; 8918 } 8919 8920 // Check for members of const-qualified, non-class type. 8921 QualType BaseType = Context.getBaseElementType(Field->getType()); 8922 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8923 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8924 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8925 Diag(Field->getLocation(), diag::note_declared_at); 8926 Diag(CurrentLocation, diag::note_member_synthesized_at) 8927 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8928 Invalid = true; 8929 continue; 8930 } 8931 8932 // Suppress assigning zero-width bitfields. 8933 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8934 continue; 8935 8936 QualType FieldType = Field->getType().getNonReferenceType(); 8937 if (FieldType->isIncompleteArrayType()) { 8938 assert(ClassDecl->hasFlexibleArrayMember() && 8939 "Incomplete array type is not valid"); 8940 continue; 8941 } 8942 8943 // Build references to the field in the object we're copying from and to. 8944 CXXScopeSpec SS; // Intentionally empty 8945 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8946 LookupMemberName); 8947 MemberLookup.addDecl(*Field); 8948 MemberLookup.resolveKind(); 8949 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8950 Loc, /*IsArrow=*/false, 8951 SS, SourceLocation(), 0, 8952 MemberLookup, 0); 8953 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8954 Loc, /*IsArrow=*/true, 8955 SS, SourceLocation(), 0, 8956 MemberLookup, 0); 8957 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8958 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8959 8960 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8961 "Member reference with rvalue base must be rvalue except for reference " 8962 "members, which aren't allowed for move assignment."); 8963 8964 // Build the move of this field. 8965 StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType, 8966 To.get(), From.get(), 8967 /*CopyingBaseSubobject=*/false, 8968 /*Copying=*/false); 8969 if (Move.isInvalid()) { 8970 Diag(CurrentLocation, diag::note_member_synthesized_at) 8971 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8972 MoveAssignOperator->setInvalidDecl(); 8973 return; 8974 } 8975 8976 // Success! Record the copy. 8977 Statements.push_back(Move.takeAs<Stmt>()); 8978 } 8979 8980 if (!Invalid) { 8981 // Add a "return *this;" 8982 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8983 8984 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8985 if (Return.isInvalid()) 8986 Invalid = true; 8987 else { 8988 Statements.push_back(Return.takeAs<Stmt>()); 8989 8990 if (Trap.hasErrorOccurred()) { 8991 Diag(CurrentLocation, diag::note_member_synthesized_at) 8992 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8993 Invalid = true; 8994 } 8995 } 8996 } 8997 8998 if (Invalid) { 8999 MoveAssignOperator->setInvalidDecl(); 9000 return; 9001 } 9002 9003 StmtResult Body; 9004 { 9005 CompoundScopeRAII CompoundScope(*this); 9006 Body = ActOnCompoundStmt(Loc, Loc, Statements, 9007 /*isStmtExpr=*/false); 9008 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 9009 } 9010 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 9011 9012 if (ASTMutationListener *L = getASTMutationListener()) { 9013 L->CompletedImplicitDefinition(MoveAssignOperator); 9014 } 9015} 9016 9017Sema::ImplicitExceptionSpecification 9018Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 9019 CXXRecordDecl *ClassDecl = MD->getParent(); 9020 9021 ImplicitExceptionSpecification ExceptSpec(*this); 9022 if (ClassDecl->isInvalidDecl()) 9023 return ExceptSpec; 9024 9025 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 9026 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 9027 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 9028 9029 // C++ [except.spec]p14: 9030 // An implicitly declared special member function (Clause 12) shall have an 9031 // exception-specification. [...] 9032 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9033 BaseEnd = ClassDecl->bases_end(); 9034 Base != BaseEnd; 9035 ++Base) { 9036 // Virtual bases are handled below. 9037 if (Base->isVirtual()) 9038 continue; 9039 9040 CXXRecordDecl *BaseClassDecl 9041 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9042 if (CXXConstructorDecl *CopyConstructor = 9043 LookupCopyingConstructor(BaseClassDecl, Quals)) 9044 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 9045 } 9046 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9047 BaseEnd = ClassDecl->vbases_end(); 9048 Base != BaseEnd; 9049 ++Base) { 9050 CXXRecordDecl *BaseClassDecl 9051 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9052 if (CXXConstructorDecl *CopyConstructor = 9053 LookupCopyingConstructor(BaseClassDecl, Quals)) 9054 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 9055 } 9056 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9057 FieldEnd = ClassDecl->field_end(); 9058 Field != FieldEnd; 9059 ++Field) { 9060 QualType FieldType = Context.getBaseElementType(Field->getType()); 9061 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 9062 if (CXXConstructorDecl *CopyConstructor = 9063 LookupCopyingConstructor(FieldClassDecl, 9064 Quals | FieldType.getCVRQualifiers())) 9065 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 9066 } 9067 } 9068 9069 return ExceptSpec; 9070} 9071 9072CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 9073 CXXRecordDecl *ClassDecl) { 9074 // C++ [class.copy]p4: 9075 // If the class definition does not explicitly declare a copy 9076 // constructor, one is declared implicitly. 9077 assert(ClassDecl->needsImplicitCopyConstructor()); 9078 9079 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyConstructor); 9080 if (DSM.isAlreadyBeingDeclared()) 9081 return 0; 9082 9083 QualType ClassType = Context.getTypeDeclType(ClassDecl); 9084 QualType ArgType = ClassType; 9085 bool Const = ClassDecl->implicitCopyConstructorHasConstParam(); 9086 if (Const) 9087 ArgType = ArgType.withConst(); 9088 ArgType = Context.getLValueReferenceType(ArgType); 9089 9090 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9091 CXXCopyConstructor, 9092 Const); 9093 9094 DeclarationName Name 9095 = Context.DeclarationNames.getCXXConstructorName( 9096 Context.getCanonicalType(ClassType)); 9097 SourceLocation ClassLoc = ClassDecl->getLocation(); 9098 DeclarationNameInfo NameInfo(Name, ClassLoc); 9099 9100 // An implicitly-declared copy constructor is an inline public 9101 // member of its class. 9102 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 9103 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 9104 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 9105 Constexpr); 9106 CopyConstructor->setAccess(AS_public); 9107 CopyConstructor->setDefaulted(); 9108 9109 // Build an exception specification pointing back at this member. 9110 FunctionProtoType::ExtProtoInfo EPI; 9111 EPI.ExceptionSpecType = EST_Unevaluated; 9112 EPI.ExceptionSpecDecl = CopyConstructor; 9113 CopyConstructor->setType( 9114 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 9115 9116 // Add the parameter to the constructor. 9117 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 9118 ClassLoc, ClassLoc, 9119 /*IdentifierInfo=*/0, 9120 ArgType, /*TInfo=*/0, 9121 SC_None, 9122 SC_None, 0); 9123 CopyConstructor->setParams(FromParam); 9124 9125 CopyConstructor->setTrivial( 9126 ClassDecl->needsOverloadResolutionForCopyConstructor() 9127 ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor) 9128 : ClassDecl->hasTrivialCopyConstructor()); 9129 9130 // C++11 [class.copy]p8: 9131 // ... If the class definition does not explicitly declare a copy 9132 // constructor, there is no user-declared move constructor, and there is no 9133 // user-declared move assignment operator, a copy constructor is implicitly 9134 // declared as defaulted. 9135 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 9136 CopyConstructor->setDeletedAsWritten(); 9137 9138 // Note that we have declared this constructor. 9139 ++ASTContext::NumImplicitCopyConstructorsDeclared; 9140 9141 if (Scope *S = getScopeForContext(ClassDecl)) 9142 PushOnScopeChains(CopyConstructor, S, false); 9143 ClassDecl->addDecl(CopyConstructor); 9144 9145 return CopyConstructor; 9146} 9147 9148void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 9149 CXXConstructorDecl *CopyConstructor) { 9150 assert((CopyConstructor->isDefaulted() && 9151 CopyConstructor->isCopyConstructor() && 9152 !CopyConstructor->doesThisDeclarationHaveABody() && 9153 !CopyConstructor->isDeleted()) && 9154 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 9155 9156 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 9157 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 9158 9159 SynthesizedFunctionScope Scope(*this, CopyConstructor); 9160 DiagnosticErrorTrap Trap(Diags); 9161 9162 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 9163 Trap.hasErrorOccurred()) { 9164 Diag(CurrentLocation, diag::note_member_synthesized_at) 9165 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 9166 CopyConstructor->setInvalidDecl(); 9167 } else { 9168 Sema::CompoundScopeRAII CompoundScope(*this); 9169 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 9170 CopyConstructor->getLocation(), 9171 MultiStmtArg(), 9172 /*isStmtExpr=*/false) 9173 .takeAs<Stmt>()); 9174 CopyConstructor->setImplicitlyDefined(true); 9175 } 9176 9177 CopyConstructor->setUsed(); 9178 if (ASTMutationListener *L = getASTMutationListener()) { 9179 L->CompletedImplicitDefinition(CopyConstructor); 9180 } 9181} 9182 9183Sema::ImplicitExceptionSpecification 9184Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 9185 CXXRecordDecl *ClassDecl = MD->getParent(); 9186 9187 // C++ [except.spec]p14: 9188 // An implicitly declared special member function (Clause 12) shall have an 9189 // exception-specification. [...] 9190 ImplicitExceptionSpecification ExceptSpec(*this); 9191 if (ClassDecl->isInvalidDecl()) 9192 return ExceptSpec; 9193 9194 // Direct base-class constructors. 9195 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 9196 BEnd = ClassDecl->bases_end(); 9197 B != BEnd; ++B) { 9198 if (B->isVirtual()) // Handled below. 9199 continue; 9200 9201 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 9202 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 9203 CXXConstructorDecl *Constructor = 9204 LookupMovingConstructor(BaseClassDecl, 0); 9205 // If this is a deleted function, add it anyway. This might be conformant 9206 // with the standard. This might not. I'm not sure. It might not matter. 9207 if (Constructor) 9208 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 9209 } 9210 } 9211 9212 // Virtual base-class constructors. 9213 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 9214 BEnd = ClassDecl->vbases_end(); 9215 B != BEnd; ++B) { 9216 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 9217 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 9218 CXXConstructorDecl *Constructor = 9219 LookupMovingConstructor(BaseClassDecl, 0); 9220 // If this is a deleted function, add it anyway. This might be conformant 9221 // with the standard. This might not. I'm not sure. It might not matter. 9222 if (Constructor) 9223 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 9224 } 9225 } 9226 9227 // Field constructors. 9228 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 9229 FEnd = ClassDecl->field_end(); 9230 F != FEnd; ++F) { 9231 QualType FieldType = Context.getBaseElementType(F->getType()); 9232 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 9233 CXXConstructorDecl *Constructor = 9234 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 9235 // If this is a deleted function, add it anyway. This might be conformant 9236 // with the standard. This might not. I'm not sure. It might not matter. 9237 // In particular, the problem is that this function never gets called. It 9238 // might just be ill-formed because this function attempts to refer to 9239 // a deleted function here. 9240 if (Constructor) 9241 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 9242 } 9243 } 9244 9245 return ExceptSpec; 9246} 9247 9248CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 9249 CXXRecordDecl *ClassDecl) { 9250 // C++11 [class.copy]p9: 9251 // If the definition of a class X does not explicitly declare a move 9252 // constructor, one will be implicitly declared as defaulted if and only if: 9253 // 9254 // - [first 4 bullets] 9255 assert(ClassDecl->needsImplicitMoveConstructor()); 9256 9257 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveConstructor); 9258 if (DSM.isAlreadyBeingDeclared()) 9259 return 0; 9260 9261 // [Checked after we build the declaration] 9262 // - the move assignment operator would not be implicitly defined as 9263 // deleted, 9264 9265 // [DR1402]: 9266 // - each of X's non-static data members and direct or virtual base classes 9267 // has a type that either has a move constructor or is trivially copyable. 9268 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 9269 ClassDecl->setFailedImplicitMoveConstructor(); 9270 return 0; 9271 } 9272 9273 QualType ClassType = Context.getTypeDeclType(ClassDecl); 9274 QualType ArgType = Context.getRValueReferenceType(ClassType); 9275 9276 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9277 CXXMoveConstructor, 9278 false); 9279 9280 DeclarationName Name 9281 = Context.DeclarationNames.getCXXConstructorName( 9282 Context.getCanonicalType(ClassType)); 9283 SourceLocation ClassLoc = ClassDecl->getLocation(); 9284 DeclarationNameInfo NameInfo(Name, ClassLoc); 9285 9286 // C++0x [class.copy]p11: 9287 // An implicitly-declared copy/move constructor is an inline public 9288 // member of its class. 9289 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 9290 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 9291 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 9292 Constexpr); 9293 MoveConstructor->setAccess(AS_public); 9294 MoveConstructor->setDefaulted(); 9295 9296 // Build an exception specification pointing back at this member. 9297 FunctionProtoType::ExtProtoInfo EPI; 9298 EPI.ExceptionSpecType = EST_Unevaluated; 9299 EPI.ExceptionSpecDecl = MoveConstructor; 9300 MoveConstructor->setType( 9301 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 9302 9303 // Add the parameter to the constructor. 9304 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 9305 ClassLoc, ClassLoc, 9306 /*IdentifierInfo=*/0, 9307 ArgType, /*TInfo=*/0, 9308 SC_None, 9309 SC_None, 0); 9310 MoveConstructor->setParams(FromParam); 9311 9312 MoveConstructor->setTrivial( 9313 ClassDecl->needsOverloadResolutionForMoveConstructor() 9314 ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor) 9315 : ClassDecl->hasTrivialMoveConstructor()); 9316 9317 // C++0x [class.copy]p9: 9318 // If the definition of a class X does not explicitly declare a move 9319 // constructor, one will be implicitly declared as defaulted if and only if: 9320 // [...] 9321 // - the move constructor would not be implicitly defined as deleted. 9322 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 9323 // Cache this result so that we don't try to generate this over and over 9324 // on every lookup, leaking memory and wasting time. 9325 ClassDecl->setFailedImplicitMoveConstructor(); 9326 return 0; 9327 } 9328 9329 // Note that we have declared this constructor. 9330 ++ASTContext::NumImplicitMoveConstructorsDeclared; 9331 9332 if (Scope *S = getScopeForContext(ClassDecl)) 9333 PushOnScopeChains(MoveConstructor, S, false); 9334 ClassDecl->addDecl(MoveConstructor); 9335 9336 return MoveConstructor; 9337} 9338 9339void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 9340 CXXConstructorDecl *MoveConstructor) { 9341 assert((MoveConstructor->isDefaulted() && 9342 MoveConstructor->isMoveConstructor() && 9343 !MoveConstructor->doesThisDeclarationHaveABody() && 9344 !MoveConstructor->isDeleted()) && 9345 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 9346 9347 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 9348 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 9349 9350 SynthesizedFunctionScope Scope(*this, MoveConstructor); 9351 DiagnosticErrorTrap Trap(Diags); 9352 9353 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 9354 Trap.hasErrorOccurred()) { 9355 Diag(CurrentLocation, diag::note_member_synthesized_at) 9356 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 9357 MoveConstructor->setInvalidDecl(); 9358 } else { 9359 Sema::CompoundScopeRAII CompoundScope(*this); 9360 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 9361 MoveConstructor->getLocation(), 9362 MultiStmtArg(), 9363 /*isStmtExpr=*/false) 9364 .takeAs<Stmt>()); 9365 MoveConstructor->setImplicitlyDefined(true); 9366 } 9367 9368 MoveConstructor->setUsed(); 9369 9370 if (ASTMutationListener *L = getASTMutationListener()) { 9371 L->CompletedImplicitDefinition(MoveConstructor); 9372 } 9373} 9374 9375bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 9376 return FD->isDeleted() && 9377 (FD->isDefaulted() || FD->isImplicit()) && 9378 isa<CXXMethodDecl>(FD); 9379} 9380 9381/// \brief Mark the call operator of the given lambda closure type as "used". 9382static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 9383 CXXMethodDecl *CallOperator 9384 = cast<CXXMethodDecl>( 9385 Lambda->lookup( 9386 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).front()); 9387 CallOperator->setReferenced(); 9388 CallOperator->setUsed(); 9389} 9390 9391void Sema::DefineImplicitLambdaToFunctionPointerConversion( 9392 SourceLocation CurrentLocation, 9393 CXXConversionDecl *Conv) 9394{ 9395 CXXRecordDecl *Lambda = Conv->getParent(); 9396 9397 // Make sure that the lambda call operator is marked used. 9398 markLambdaCallOperatorUsed(*this, Lambda); 9399 9400 Conv->setUsed(); 9401 9402 SynthesizedFunctionScope Scope(*this, Conv); 9403 DiagnosticErrorTrap Trap(Diags); 9404 9405 // Return the address of the __invoke function. 9406 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 9407 CXXMethodDecl *Invoke 9408 = cast<CXXMethodDecl>(Lambda->lookup(InvokeName).front()); 9409 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 9410 VK_LValue, Conv->getLocation()).take(); 9411 assert(FunctionRef && "Can't refer to __invoke function?"); 9412 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 9413 Conv->setBody(new (Context) CompoundStmt(Context, Return, 9414 Conv->getLocation(), 9415 Conv->getLocation())); 9416 9417 // Fill in the __invoke function with a dummy implementation. IR generation 9418 // will fill in the actual details. 9419 Invoke->setUsed(); 9420 Invoke->setReferenced(); 9421 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation())); 9422 9423 if (ASTMutationListener *L = getASTMutationListener()) { 9424 L->CompletedImplicitDefinition(Conv); 9425 L->CompletedImplicitDefinition(Invoke); 9426 } 9427} 9428 9429void Sema::DefineImplicitLambdaToBlockPointerConversion( 9430 SourceLocation CurrentLocation, 9431 CXXConversionDecl *Conv) 9432{ 9433 Conv->setUsed(); 9434 9435 SynthesizedFunctionScope Scope(*this, Conv); 9436 DiagnosticErrorTrap Trap(Diags); 9437 9438 // Copy-initialize the lambda object as needed to capture it. 9439 Expr *This = ActOnCXXThis(CurrentLocation).take(); 9440 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 9441 9442 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 9443 Conv->getLocation(), 9444 Conv, DerefThis); 9445 9446 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 9447 // behavior. Note that only the general conversion function does this 9448 // (since it's unusable otherwise); in the case where we inline the 9449 // block literal, it has block literal lifetime semantics. 9450 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 9451 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 9452 CK_CopyAndAutoreleaseBlockObject, 9453 BuildBlock.get(), 0, VK_RValue); 9454 9455 if (BuildBlock.isInvalid()) { 9456 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9457 Conv->setInvalidDecl(); 9458 return; 9459 } 9460 9461 // Create the return statement that returns the block from the conversion 9462 // function. 9463 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 9464 if (Return.isInvalid()) { 9465 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9466 Conv->setInvalidDecl(); 9467 return; 9468 } 9469 9470 // Set the body of the conversion function. 9471 Stmt *ReturnS = Return.take(); 9472 Conv->setBody(new (Context) CompoundStmt(Context, ReturnS, 9473 Conv->getLocation(), 9474 Conv->getLocation())); 9475 9476 // We're done; notify the mutation listener, if any. 9477 if (ASTMutationListener *L = getASTMutationListener()) { 9478 L->CompletedImplicitDefinition(Conv); 9479 } 9480} 9481 9482/// \brief Determine whether the given list arguments contains exactly one 9483/// "real" (non-default) argument. 9484static bool hasOneRealArgument(MultiExprArg Args) { 9485 switch (Args.size()) { 9486 case 0: 9487 return false; 9488 9489 default: 9490 if (!Args[1]->isDefaultArgument()) 9491 return false; 9492 9493 // fall through 9494 case 1: 9495 return !Args[0]->isDefaultArgument(); 9496 } 9497 9498 return false; 9499} 9500 9501ExprResult 9502Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9503 CXXConstructorDecl *Constructor, 9504 MultiExprArg ExprArgs, 9505 bool HadMultipleCandidates, 9506 bool IsListInitialization, 9507 bool RequiresZeroInit, 9508 unsigned ConstructKind, 9509 SourceRange ParenRange) { 9510 bool Elidable = false; 9511 9512 // C++0x [class.copy]p34: 9513 // When certain criteria are met, an implementation is allowed to 9514 // omit the copy/move construction of a class object, even if the 9515 // copy/move constructor and/or destructor for the object have 9516 // side effects. [...] 9517 // - when a temporary class object that has not been bound to a 9518 // reference (12.2) would be copied/moved to a class object 9519 // with the same cv-unqualified type, the copy/move operation 9520 // can be omitted by constructing the temporary object 9521 // directly into the target of the omitted copy/move 9522 if (ConstructKind == CXXConstructExpr::CK_Complete && 9523 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9524 Expr *SubExpr = ExprArgs[0]; 9525 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9526 } 9527 9528 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9529 Elidable, ExprArgs, HadMultipleCandidates, 9530 IsListInitialization, RequiresZeroInit, 9531 ConstructKind, ParenRange); 9532} 9533 9534/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9535/// including handling of its default argument expressions. 9536ExprResult 9537Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9538 CXXConstructorDecl *Constructor, bool Elidable, 9539 MultiExprArg ExprArgs, 9540 bool HadMultipleCandidates, 9541 bool IsListInitialization, 9542 bool RequiresZeroInit, 9543 unsigned ConstructKind, 9544 SourceRange ParenRange) { 9545 MarkFunctionReferenced(ConstructLoc, Constructor); 9546 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9547 Constructor, Elidable, ExprArgs, 9548 HadMultipleCandidates, 9549 IsListInitialization, RequiresZeroInit, 9550 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9551 ParenRange)); 9552} 9553 9554void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9555 if (VD->isInvalidDecl()) return; 9556 9557 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9558 if (ClassDecl->isInvalidDecl()) return; 9559 if (ClassDecl->hasIrrelevantDestructor()) return; 9560 if (ClassDecl->isDependentContext()) return; 9561 9562 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9563 MarkFunctionReferenced(VD->getLocation(), Destructor); 9564 CheckDestructorAccess(VD->getLocation(), Destructor, 9565 PDiag(diag::err_access_dtor_var) 9566 << VD->getDeclName() 9567 << VD->getType()); 9568 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9569 9570 if (!VD->hasGlobalStorage()) return; 9571 9572 // Emit warning for non-trivial dtor in global scope (a real global, 9573 // class-static, function-static). 9574 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9575 9576 // TODO: this should be re-enabled for static locals by !CXAAtExit 9577 if (!VD->isStaticLocal()) 9578 Diag(VD->getLocation(), diag::warn_global_destructor); 9579} 9580 9581/// \brief Given a constructor and the set of arguments provided for the 9582/// constructor, convert the arguments and add any required default arguments 9583/// to form a proper call to this constructor. 9584/// 9585/// \returns true if an error occurred, false otherwise. 9586bool 9587Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9588 MultiExprArg ArgsPtr, 9589 SourceLocation Loc, 9590 SmallVectorImpl<Expr*> &ConvertedArgs, 9591 bool AllowExplicit) { 9592 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9593 unsigned NumArgs = ArgsPtr.size(); 9594 Expr **Args = ArgsPtr.data(); 9595 9596 const FunctionProtoType *Proto 9597 = Constructor->getType()->getAs<FunctionProtoType>(); 9598 assert(Proto && "Constructor without a prototype?"); 9599 unsigned NumArgsInProto = Proto->getNumArgs(); 9600 9601 // If too few arguments are available, we'll fill in the rest with defaults. 9602 if (NumArgs < NumArgsInProto) 9603 ConvertedArgs.reserve(NumArgsInProto); 9604 else 9605 ConvertedArgs.reserve(NumArgs); 9606 9607 VariadicCallType CallType = 9608 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9609 SmallVector<Expr *, 8> AllArgs; 9610 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9611 Proto, 0, Args, NumArgs, AllArgs, 9612 CallType, AllowExplicit); 9613 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9614 9615 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9616 9617 CheckConstructorCall(Constructor, 9618 llvm::makeArrayRef<const Expr *>(AllArgs.data(), 9619 AllArgs.size()), 9620 Proto, Loc); 9621 9622 return Invalid; 9623} 9624 9625static inline bool 9626CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9627 const FunctionDecl *FnDecl) { 9628 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9629 if (isa<NamespaceDecl>(DC)) { 9630 return SemaRef.Diag(FnDecl->getLocation(), 9631 diag::err_operator_new_delete_declared_in_namespace) 9632 << FnDecl->getDeclName(); 9633 } 9634 9635 if (isa<TranslationUnitDecl>(DC) && 9636 FnDecl->getStorageClass() == SC_Static) { 9637 return SemaRef.Diag(FnDecl->getLocation(), 9638 diag::err_operator_new_delete_declared_static) 9639 << FnDecl->getDeclName(); 9640 } 9641 9642 return false; 9643} 9644 9645static inline bool 9646CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9647 CanQualType ExpectedResultType, 9648 CanQualType ExpectedFirstParamType, 9649 unsigned DependentParamTypeDiag, 9650 unsigned InvalidParamTypeDiag) { 9651 QualType ResultType = 9652 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9653 9654 // Check that the result type is not dependent. 9655 if (ResultType->isDependentType()) 9656 return SemaRef.Diag(FnDecl->getLocation(), 9657 diag::err_operator_new_delete_dependent_result_type) 9658 << FnDecl->getDeclName() << ExpectedResultType; 9659 9660 // Check that the result type is what we expect. 9661 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9662 return SemaRef.Diag(FnDecl->getLocation(), 9663 diag::err_operator_new_delete_invalid_result_type) 9664 << FnDecl->getDeclName() << ExpectedResultType; 9665 9666 // A function template must have at least 2 parameters. 9667 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9668 return SemaRef.Diag(FnDecl->getLocation(), 9669 diag::err_operator_new_delete_template_too_few_parameters) 9670 << FnDecl->getDeclName(); 9671 9672 // The function decl must have at least 1 parameter. 9673 if (FnDecl->getNumParams() == 0) 9674 return SemaRef.Diag(FnDecl->getLocation(), 9675 diag::err_operator_new_delete_too_few_parameters) 9676 << FnDecl->getDeclName(); 9677 9678 // Check the first parameter type is not dependent. 9679 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9680 if (FirstParamType->isDependentType()) 9681 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9682 << FnDecl->getDeclName() << ExpectedFirstParamType; 9683 9684 // Check that the first parameter type is what we expect. 9685 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9686 ExpectedFirstParamType) 9687 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9688 << FnDecl->getDeclName() << ExpectedFirstParamType; 9689 9690 return false; 9691} 9692 9693static bool 9694CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9695 // C++ [basic.stc.dynamic.allocation]p1: 9696 // A program is ill-formed if an allocation function is declared in a 9697 // namespace scope other than global scope or declared static in global 9698 // scope. 9699 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9700 return true; 9701 9702 CanQualType SizeTy = 9703 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9704 9705 // C++ [basic.stc.dynamic.allocation]p1: 9706 // The return type shall be void*. The first parameter shall have type 9707 // std::size_t. 9708 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9709 SizeTy, 9710 diag::err_operator_new_dependent_param_type, 9711 diag::err_operator_new_param_type)) 9712 return true; 9713 9714 // C++ [basic.stc.dynamic.allocation]p1: 9715 // The first parameter shall not have an associated default argument. 9716 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9717 return SemaRef.Diag(FnDecl->getLocation(), 9718 diag::err_operator_new_default_arg) 9719 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9720 9721 return false; 9722} 9723 9724static bool 9725CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) { 9726 // C++ [basic.stc.dynamic.deallocation]p1: 9727 // A program is ill-formed if deallocation functions are declared in a 9728 // namespace scope other than global scope or declared static in global 9729 // scope. 9730 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9731 return true; 9732 9733 // C++ [basic.stc.dynamic.deallocation]p2: 9734 // Each deallocation function shall return void and its first parameter 9735 // shall be void*. 9736 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9737 SemaRef.Context.VoidPtrTy, 9738 diag::err_operator_delete_dependent_param_type, 9739 diag::err_operator_delete_param_type)) 9740 return true; 9741 9742 return false; 9743} 9744 9745/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9746/// of this overloaded operator is well-formed. If so, returns false; 9747/// otherwise, emits appropriate diagnostics and returns true. 9748bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9749 assert(FnDecl && FnDecl->isOverloadedOperator() && 9750 "Expected an overloaded operator declaration"); 9751 9752 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9753 9754 // C++ [over.oper]p5: 9755 // The allocation and deallocation functions, operator new, 9756 // operator new[], operator delete and operator delete[], are 9757 // described completely in 3.7.3. The attributes and restrictions 9758 // found in the rest of this subclause do not apply to them unless 9759 // explicitly stated in 3.7.3. 9760 if (Op == OO_Delete || Op == OO_Array_Delete) 9761 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9762 9763 if (Op == OO_New || Op == OO_Array_New) 9764 return CheckOperatorNewDeclaration(*this, FnDecl); 9765 9766 // C++ [over.oper]p6: 9767 // An operator function shall either be a non-static member 9768 // function or be a non-member function and have at least one 9769 // parameter whose type is a class, a reference to a class, an 9770 // enumeration, or a reference to an enumeration. 9771 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9772 if (MethodDecl->isStatic()) 9773 return Diag(FnDecl->getLocation(), 9774 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9775 } else { 9776 bool ClassOrEnumParam = false; 9777 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9778 ParamEnd = FnDecl->param_end(); 9779 Param != ParamEnd; ++Param) { 9780 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9781 if (ParamType->isDependentType() || ParamType->isRecordType() || 9782 ParamType->isEnumeralType()) { 9783 ClassOrEnumParam = true; 9784 break; 9785 } 9786 } 9787 9788 if (!ClassOrEnumParam) 9789 return Diag(FnDecl->getLocation(), 9790 diag::err_operator_overload_needs_class_or_enum) 9791 << FnDecl->getDeclName(); 9792 } 9793 9794 // C++ [over.oper]p8: 9795 // An operator function cannot have default arguments (8.3.6), 9796 // except where explicitly stated below. 9797 // 9798 // Only the function-call operator allows default arguments 9799 // (C++ [over.call]p1). 9800 if (Op != OO_Call) { 9801 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9802 Param != FnDecl->param_end(); ++Param) { 9803 if ((*Param)->hasDefaultArg()) 9804 return Diag((*Param)->getLocation(), 9805 diag::err_operator_overload_default_arg) 9806 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9807 } 9808 } 9809 9810 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9811 { false, false, false } 9812#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9813 , { Unary, Binary, MemberOnly } 9814#include "clang/Basic/OperatorKinds.def" 9815 }; 9816 9817 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9818 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9819 bool MustBeMemberOperator = OperatorUses[Op][2]; 9820 9821 // C++ [over.oper]p8: 9822 // [...] Operator functions cannot have more or fewer parameters 9823 // than the number required for the corresponding operator, as 9824 // described in the rest of this subclause. 9825 unsigned NumParams = FnDecl->getNumParams() 9826 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9827 if (Op != OO_Call && 9828 ((NumParams == 1 && !CanBeUnaryOperator) || 9829 (NumParams == 2 && !CanBeBinaryOperator) || 9830 (NumParams < 1) || (NumParams > 2))) { 9831 // We have the wrong number of parameters. 9832 unsigned ErrorKind; 9833 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9834 ErrorKind = 2; // 2 -> unary or binary. 9835 } else if (CanBeUnaryOperator) { 9836 ErrorKind = 0; // 0 -> unary 9837 } else { 9838 assert(CanBeBinaryOperator && 9839 "All non-call overloaded operators are unary or binary!"); 9840 ErrorKind = 1; // 1 -> binary 9841 } 9842 9843 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9844 << FnDecl->getDeclName() << NumParams << ErrorKind; 9845 } 9846 9847 // Overloaded operators other than operator() cannot be variadic. 9848 if (Op != OO_Call && 9849 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9850 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9851 << FnDecl->getDeclName(); 9852 } 9853 9854 // Some operators must be non-static member functions. 9855 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9856 return Diag(FnDecl->getLocation(), 9857 diag::err_operator_overload_must_be_member) 9858 << FnDecl->getDeclName(); 9859 } 9860 9861 // C++ [over.inc]p1: 9862 // The user-defined function called operator++ implements the 9863 // prefix and postfix ++ operator. If this function is a member 9864 // function with no parameters, or a non-member function with one 9865 // parameter of class or enumeration type, it defines the prefix 9866 // increment operator ++ for objects of that type. If the function 9867 // is a member function with one parameter (which shall be of type 9868 // int) or a non-member function with two parameters (the second 9869 // of which shall be of type int), it defines the postfix 9870 // increment operator ++ for objects of that type. 9871 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9872 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9873 bool ParamIsInt = false; 9874 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9875 ParamIsInt = BT->getKind() == BuiltinType::Int; 9876 9877 if (!ParamIsInt) 9878 return Diag(LastParam->getLocation(), 9879 diag::err_operator_overload_post_incdec_must_be_int) 9880 << LastParam->getType() << (Op == OO_MinusMinus); 9881 } 9882 9883 return false; 9884} 9885 9886/// CheckLiteralOperatorDeclaration - Check whether the declaration 9887/// of this literal operator function is well-formed. If so, returns 9888/// false; otherwise, emits appropriate diagnostics and returns true. 9889bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9890 if (isa<CXXMethodDecl>(FnDecl)) { 9891 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9892 << FnDecl->getDeclName(); 9893 return true; 9894 } 9895 9896 if (FnDecl->isExternC()) { 9897 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 9898 return true; 9899 } 9900 9901 bool Valid = false; 9902 9903 // This might be the definition of a literal operator template. 9904 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 9905 // This might be a specialization of a literal operator template. 9906 if (!TpDecl) 9907 TpDecl = FnDecl->getPrimaryTemplate(); 9908 9909 // template <char...> type operator "" name() is the only valid template 9910 // signature, and the only valid signature with no parameters. 9911 if (TpDecl) { 9912 if (FnDecl->param_size() == 0) { 9913 // Must have only one template parameter 9914 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9915 if (Params->size() == 1) { 9916 NonTypeTemplateParmDecl *PmDecl = 9917 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9918 9919 // The template parameter must be a char parameter pack. 9920 if (PmDecl && PmDecl->isTemplateParameterPack() && 9921 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9922 Valid = true; 9923 } 9924 } 9925 } else if (FnDecl->param_size()) { 9926 // Check the first parameter 9927 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9928 9929 QualType T = (*Param)->getType().getUnqualifiedType(); 9930 9931 // unsigned long long int, long double, and any character type are allowed 9932 // as the only parameters. 9933 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9934 Context.hasSameType(T, Context.LongDoubleTy) || 9935 Context.hasSameType(T, Context.CharTy) || 9936 Context.hasSameType(T, Context.WCharTy) || 9937 Context.hasSameType(T, Context.Char16Ty) || 9938 Context.hasSameType(T, Context.Char32Ty)) { 9939 if (++Param == FnDecl->param_end()) 9940 Valid = true; 9941 goto FinishedParams; 9942 } 9943 9944 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9945 const PointerType *PT = T->getAs<PointerType>(); 9946 if (!PT) 9947 goto FinishedParams; 9948 T = PT->getPointeeType(); 9949 if (!T.isConstQualified() || T.isVolatileQualified()) 9950 goto FinishedParams; 9951 T = T.getUnqualifiedType(); 9952 9953 // Move on to the second parameter; 9954 ++Param; 9955 9956 // If there is no second parameter, the first must be a const char * 9957 if (Param == FnDecl->param_end()) { 9958 if (Context.hasSameType(T, Context.CharTy)) 9959 Valid = true; 9960 goto FinishedParams; 9961 } 9962 9963 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9964 // are allowed as the first parameter to a two-parameter function 9965 if (!(Context.hasSameType(T, Context.CharTy) || 9966 Context.hasSameType(T, Context.WCharTy) || 9967 Context.hasSameType(T, Context.Char16Ty) || 9968 Context.hasSameType(T, Context.Char32Ty))) 9969 goto FinishedParams; 9970 9971 // The second and final parameter must be an std::size_t 9972 T = (*Param)->getType().getUnqualifiedType(); 9973 if (Context.hasSameType(T, Context.getSizeType()) && 9974 ++Param == FnDecl->param_end()) 9975 Valid = true; 9976 } 9977 9978 // FIXME: This diagnostic is absolutely terrible. 9979FinishedParams: 9980 if (!Valid) { 9981 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9982 << FnDecl->getDeclName(); 9983 return true; 9984 } 9985 9986 // A parameter-declaration-clause containing a default argument is not 9987 // equivalent to any of the permitted forms. 9988 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9989 ParamEnd = FnDecl->param_end(); 9990 Param != ParamEnd; ++Param) { 9991 if ((*Param)->hasDefaultArg()) { 9992 Diag((*Param)->getDefaultArgRange().getBegin(), 9993 diag::err_literal_operator_default_argument) 9994 << (*Param)->getDefaultArgRange(); 9995 break; 9996 } 9997 } 9998 9999 StringRef LiteralName 10000 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 10001 if (LiteralName[0] != '_') { 10002 // C++11 [usrlit.suffix]p1: 10003 // Literal suffix identifiers that do not start with an underscore 10004 // are reserved for future standardization. 10005 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 10006 } 10007 10008 return false; 10009} 10010 10011/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 10012/// linkage specification, including the language and (if present) 10013/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 10014/// the location of the language string literal, which is provided 10015/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 10016/// the '{' brace. Otherwise, this linkage specification does not 10017/// have any braces. 10018Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 10019 SourceLocation LangLoc, 10020 StringRef Lang, 10021 SourceLocation LBraceLoc) { 10022 LinkageSpecDecl::LanguageIDs Language; 10023 if (Lang == "\"C\"") 10024 Language = LinkageSpecDecl::lang_c; 10025 else if (Lang == "\"C++\"") 10026 Language = LinkageSpecDecl::lang_cxx; 10027 else { 10028 Diag(LangLoc, diag::err_bad_language); 10029 return 0; 10030 } 10031 10032 // FIXME: Add all the various semantics of linkage specifications 10033 10034 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 10035 ExternLoc, LangLoc, Language); 10036 CurContext->addDecl(D); 10037 PushDeclContext(S, D); 10038 return D; 10039} 10040 10041/// ActOnFinishLinkageSpecification - Complete the definition of 10042/// the C++ linkage specification LinkageSpec. If RBraceLoc is 10043/// valid, it's the position of the closing '}' brace in a linkage 10044/// specification that uses braces. 10045Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 10046 Decl *LinkageSpec, 10047 SourceLocation RBraceLoc) { 10048 if (LinkageSpec) { 10049 if (RBraceLoc.isValid()) { 10050 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 10051 LSDecl->setRBraceLoc(RBraceLoc); 10052 } 10053 PopDeclContext(); 10054 } 10055 return LinkageSpec; 10056} 10057 10058/// \brief Perform semantic analysis for the variable declaration that 10059/// occurs within a C++ catch clause, returning the newly-created 10060/// variable. 10061VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 10062 TypeSourceInfo *TInfo, 10063 SourceLocation StartLoc, 10064 SourceLocation Loc, 10065 IdentifierInfo *Name) { 10066 bool Invalid = false; 10067 QualType ExDeclType = TInfo->getType(); 10068 10069 // Arrays and functions decay. 10070 if (ExDeclType->isArrayType()) 10071 ExDeclType = Context.getArrayDecayedType(ExDeclType); 10072 else if (ExDeclType->isFunctionType()) 10073 ExDeclType = Context.getPointerType(ExDeclType); 10074 10075 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 10076 // The exception-declaration shall not denote a pointer or reference to an 10077 // incomplete type, other than [cv] void*. 10078 // N2844 forbids rvalue references. 10079 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 10080 Diag(Loc, diag::err_catch_rvalue_ref); 10081 Invalid = true; 10082 } 10083 10084 QualType BaseType = ExDeclType; 10085 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 10086 unsigned DK = diag::err_catch_incomplete; 10087 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 10088 BaseType = Ptr->getPointeeType(); 10089 Mode = 1; 10090 DK = diag::err_catch_incomplete_ptr; 10091 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 10092 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 10093 BaseType = Ref->getPointeeType(); 10094 Mode = 2; 10095 DK = diag::err_catch_incomplete_ref; 10096 } 10097 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 10098 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 10099 Invalid = true; 10100 10101 if (!Invalid && !ExDeclType->isDependentType() && 10102 RequireNonAbstractType(Loc, ExDeclType, 10103 diag::err_abstract_type_in_decl, 10104 AbstractVariableType)) 10105 Invalid = true; 10106 10107 // Only the non-fragile NeXT runtime currently supports C++ catches 10108 // of ObjC types, and no runtime supports catching ObjC types by value. 10109 if (!Invalid && getLangOpts().ObjC1) { 10110 QualType T = ExDeclType; 10111 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 10112 T = RT->getPointeeType(); 10113 10114 if (T->isObjCObjectType()) { 10115 Diag(Loc, diag::err_objc_object_catch); 10116 Invalid = true; 10117 } else if (T->isObjCObjectPointerType()) { 10118 // FIXME: should this be a test for macosx-fragile specifically? 10119 if (getLangOpts().ObjCRuntime.isFragile()) 10120 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 10121 } 10122 } 10123 10124 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 10125 ExDeclType, TInfo, SC_None, SC_None); 10126 ExDecl->setExceptionVariable(true); 10127 10128 // In ARC, infer 'retaining' for variables of retainable type. 10129 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 10130 Invalid = true; 10131 10132 if (!Invalid && !ExDeclType->isDependentType()) { 10133 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 10134 // C++ [except.handle]p16: 10135 // The object declared in an exception-declaration or, if the 10136 // exception-declaration does not specify a name, a temporary (12.2) is 10137 // copy-initialized (8.5) from the exception object. [...] 10138 // The object is destroyed when the handler exits, after the destruction 10139 // of any automatic objects initialized within the handler. 10140 // 10141 // We just pretend to initialize the object with itself, then make sure 10142 // it can be destroyed later. 10143 QualType initType = ExDeclType; 10144 10145 InitializedEntity entity = 10146 InitializedEntity::InitializeVariable(ExDecl); 10147 InitializationKind initKind = 10148 InitializationKind::CreateCopy(Loc, SourceLocation()); 10149 10150 Expr *opaqueValue = 10151 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 10152 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 10153 ExprResult result = sequence.Perform(*this, entity, initKind, 10154 MultiExprArg(&opaqueValue, 1)); 10155 if (result.isInvalid()) 10156 Invalid = true; 10157 else { 10158 // If the constructor used was non-trivial, set this as the 10159 // "initializer". 10160 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 10161 if (!construct->getConstructor()->isTrivial()) { 10162 Expr *init = MaybeCreateExprWithCleanups(construct); 10163 ExDecl->setInit(init); 10164 } 10165 10166 // And make sure it's destructable. 10167 FinalizeVarWithDestructor(ExDecl, recordType); 10168 } 10169 } 10170 } 10171 10172 if (Invalid) 10173 ExDecl->setInvalidDecl(); 10174 10175 return ExDecl; 10176} 10177 10178/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 10179/// handler. 10180Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 10181 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10182 bool Invalid = D.isInvalidType(); 10183 10184 // Check for unexpanded parameter packs. 10185 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 10186 UPPC_ExceptionType)) { 10187 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 10188 D.getIdentifierLoc()); 10189 Invalid = true; 10190 } 10191 10192 IdentifierInfo *II = D.getIdentifier(); 10193 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 10194 LookupOrdinaryName, 10195 ForRedeclaration)) { 10196 // The scope should be freshly made just for us. There is just no way 10197 // it contains any previous declaration. 10198 assert(!S->isDeclScope(PrevDecl)); 10199 if (PrevDecl->isTemplateParameter()) { 10200 // Maybe we will complain about the shadowed template parameter. 10201 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 10202 PrevDecl = 0; 10203 } 10204 } 10205 10206 if (D.getCXXScopeSpec().isSet() && !Invalid) { 10207 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 10208 << D.getCXXScopeSpec().getRange(); 10209 Invalid = true; 10210 } 10211 10212 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 10213 D.getLocStart(), 10214 D.getIdentifierLoc(), 10215 D.getIdentifier()); 10216 if (Invalid) 10217 ExDecl->setInvalidDecl(); 10218 10219 // Add the exception declaration into this scope. 10220 if (II) 10221 PushOnScopeChains(ExDecl, S); 10222 else 10223 CurContext->addDecl(ExDecl); 10224 10225 ProcessDeclAttributes(S, ExDecl, D); 10226 return ExDecl; 10227} 10228 10229Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 10230 Expr *AssertExpr, 10231 Expr *AssertMessageExpr, 10232 SourceLocation RParenLoc) { 10233 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 10234 10235 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 10236 return 0; 10237 10238 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 10239 AssertMessage, RParenLoc, false); 10240} 10241 10242Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 10243 Expr *AssertExpr, 10244 StringLiteral *AssertMessage, 10245 SourceLocation RParenLoc, 10246 bool Failed) { 10247 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 10248 !Failed) { 10249 // In a static_assert-declaration, the constant-expression shall be a 10250 // constant expression that can be contextually converted to bool. 10251 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 10252 if (Converted.isInvalid()) 10253 Failed = true; 10254 10255 llvm::APSInt Cond; 10256 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 10257 diag::err_static_assert_expression_is_not_constant, 10258 /*AllowFold=*/false).isInvalid()) 10259 Failed = true; 10260 10261 if (!Failed && !Cond) { 10262 SmallString<256> MsgBuffer; 10263 llvm::raw_svector_ostream Msg(MsgBuffer); 10264 AssertMessage->printPretty(Msg, 0, getPrintingPolicy()); 10265 Diag(StaticAssertLoc, diag::err_static_assert_failed) 10266 << Msg.str() << AssertExpr->getSourceRange(); 10267 Failed = true; 10268 } 10269 } 10270 10271 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 10272 AssertExpr, AssertMessage, RParenLoc, 10273 Failed); 10274 10275 CurContext->addDecl(Decl); 10276 return Decl; 10277} 10278 10279/// \brief Perform semantic analysis of the given friend type declaration. 10280/// 10281/// \returns A friend declaration that. 10282FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart, 10283 SourceLocation FriendLoc, 10284 TypeSourceInfo *TSInfo) { 10285 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 10286 10287 QualType T = TSInfo->getType(); 10288 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 10289 10290 // C++03 [class.friend]p2: 10291 // An elaborated-type-specifier shall be used in a friend declaration 10292 // for a class.* 10293 // 10294 // * The class-key of the elaborated-type-specifier is required. 10295 if (!ActiveTemplateInstantiations.empty()) { 10296 // Do not complain about the form of friend template types during 10297 // template instantiation; we will already have complained when the 10298 // template was declared. 10299 } else if (!T->isElaboratedTypeSpecifier()) { 10300 // If we evaluated the type to a record type, suggest putting 10301 // a tag in front. 10302 if (const RecordType *RT = T->getAs<RecordType>()) { 10303 RecordDecl *RD = RT->getDecl(); 10304 10305 std::string InsertionText = std::string(" ") + RD->getKindName(); 10306 10307 Diag(TypeRange.getBegin(), 10308 getLangOpts().CPlusPlus11 ? 10309 diag::warn_cxx98_compat_unelaborated_friend_type : 10310 diag::ext_unelaborated_friend_type) 10311 << (unsigned) RD->getTagKind() 10312 << T 10313 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 10314 InsertionText); 10315 } else { 10316 Diag(FriendLoc, 10317 getLangOpts().CPlusPlus11 ? 10318 diag::warn_cxx98_compat_nonclass_type_friend : 10319 diag::ext_nonclass_type_friend) 10320 << T 10321 << TypeRange; 10322 } 10323 } else if (T->getAs<EnumType>()) { 10324 Diag(FriendLoc, 10325 getLangOpts().CPlusPlus11 ? 10326 diag::warn_cxx98_compat_enum_friend : 10327 diag::ext_enum_friend) 10328 << T 10329 << TypeRange; 10330 } 10331 10332 // C++11 [class.friend]p3: 10333 // A friend declaration that does not declare a function shall have one 10334 // of the following forms: 10335 // friend elaborated-type-specifier ; 10336 // friend simple-type-specifier ; 10337 // friend typename-specifier ; 10338 if (getLangOpts().CPlusPlus11 && LocStart != FriendLoc) 10339 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T; 10340 10341 // If the type specifier in a friend declaration designates a (possibly 10342 // cv-qualified) class type, that class is declared as a friend; otherwise, 10343 // the friend declaration is ignored. 10344 return FriendDecl::Create(Context, CurContext, LocStart, TSInfo, FriendLoc); 10345} 10346 10347/// Handle a friend tag declaration where the scope specifier was 10348/// templated. 10349Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 10350 unsigned TagSpec, SourceLocation TagLoc, 10351 CXXScopeSpec &SS, 10352 IdentifierInfo *Name, SourceLocation NameLoc, 10353 AttributeList *Attr, 10354 MultiTemplateParamsArg TempParamLists) { 10355 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 10356 10357 bool isExplicitSpecialization = false; 10358 bool Invalid = false; 10359 10360 if (TemplateParameterList *TemplateParams 10361 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 10362 TempParamLists.data(), 10363 TempParamLists.size(), 10364 /*friend*/ true, 10365 isExplicitSpecialization, 10366 Invalid)) { 10367 if (TemplateParams->size() > 0) { 10368 // This is a declaration of a class template. 10369 if (Invalid) 10370 return 0; 10371 10372 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 10373 SS, Name, NameLoc, Attr, 10374 TemplateParams, AS_public, 10375 /*ModulePrivateLoc=*/SourceLocation(), 10376 TempParamLists.size() - 1, 10377 TempParamLists.data()).take(); 10378 } else { 10379 // The "template<>" header is extraneous. 10380 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 10381 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 10382 isExplicitSpecialization = true; 10383 } 10384 } 10385 10386 if (Invalid) return 0; 10387 10388 bool isAllExplicitSpecializations = true; 10389 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 10390 if (TempParamLists[I]->size()) { 10391 isAllExplicitSpecializations = false; 10392 break; 10393 } 10394 } 10395 10396 // FIXME: don't ignore attributes. 10397 10398 // If it's explicit specializations all the way down, just forget 10399 // about the template header and build an appropriate non-templated 10400 // friend. TODO: for source fidelity, remember the headers. 10401 if (isAllExplicitSpecializations) { 10402 if (SS.isEmpty()) { 10403 bool Owned = false; 10404 bool IsDependent = false; 10405 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 10406 Attr, AS_public, 10407 /*ModulePrivateLoc=*/SourceLocation(), 10408 MultiTemplateParamsArg(), Owned, IsDependent, 10409 /*ScopedEnumKWLoc=*/SourceLocation(), 10410 /*ScopedEnumUsesClassTag=*/false, 10411 /*UnderlyingType=*/TypeResult()); 10412 } 10413 10414 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 10415 ElaboratedTypeKeyword Keyword 10416 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10417 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 10418 *Name, NameLoc); 10419 if (T.isNull()) 10420 return 0; 10421 10422 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10423 if (isa<DependentNameType>(T)) { 10424 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10425 TL.setElaboratedKeywordLoc(TagLoc); 10426 TL.setQualifierLoc(QualifierLoc); 10427 TL.setNameLoc(NameLoc); 10428 } else { 10429 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 10430 TL.setElaboratedKeywordLoc(TagLoc); 10431 TL.setQualifierLoc(QualifierLoc); 10432 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 10433 } 10434 10435 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10436 TSI, FriendLoc); 10437 Friend->setAccess(AS_public); 10438 CurContext->addDecl(Friend); 10439 return Friend; 10440 } 10441 10442 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 10443 10444 10445 10446 // Handle the case of a templated-scope friend class. e.g. 10447 // template <class T> class A<T>::B; 10448 // FIXME: we don't support these right now. 10449 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10450 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10451 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10452 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10453 TL.setElaboratedKeywordLoc(TagLoc); 10454 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10455 TL.setNameLoc(NameLoc); 10456 10457 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10458 TSI, FriendLoc); 10459 Friend->setAccess(AS_public); 10460 Friend->setUnsupportedFriend(true); 10461 CurContext->addDecl(Friend); 10462 return Friend; 10463} 10464 10465 10466/// Handle a friend type declaration. This works in tandem with 10467/// ActOnTag. 10468/// 10469/// Notes on friend class templates: 10470/// 10471/// We generally treat friend class declarations as if they were 10472/// declaring a class. So, for example, the elaborated type specifier 10473/// in a friend declaration is required to obey the restrictions of a 10474/// class-head (i.e. no typedefs in the scope chain), template 10475/// parameters are required to match up with simple template-ids, &c. 10476/// However, unlike when declaring a template specialization, it's 10477/// okay to refer to a template specialization without an empty 10478/// template parameter declaration, e.g. 10479/// friend class A<T>::B<unsigned>; 10480/// We permit this as a special case; if there are any template 10481/// parameters present at all, require proper matching, i.e. 10482/// template <> template \<class T> friend class A<int>::B; 10483Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10484 MultiTemplateParamsArg TempParams) { 10485 SourceLocation Loc = DS.getLocStart(); 10486 10487 assert(DS.isFriendSpecified()); 10488 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10489 10490 // Try to convert the decl specifier to a type. This works for 10491 // friend templates because ActOnTag never produces a ClassTemplateDecl 10492 // for a TUK_Friend. 10493 Declarator TheDeclarator(DS, Declarator::MemberContext); 10494 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10495 QualType T = TSI->getType(); 10496 if (TheDeclarator.isInvalidType()) 10497 return 0; 10498 10499 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10500 return 0; 10501 10502 // This is definitely an error in C++98. It's probably meant to 10503 // be forbidden in C++0x, too, but the specification is just 10504 // poorly written. 10505 // 10506 // The problem is with declarations like the following: 10507 // template <T> friend A<T>::foo; 10508 // where deciding whether a class C is a friend or not now hinges 10509 // on whether there exists an instantiation of A that causes 10510 // 'foo' to equal C. There are restrictions on class-heads 10511 // (which we declare (by fiat) elaborated friend declarations to 10512 // be) that makes this tractable. 10513 // 10514 // FIXME: handle "template <> friend class A<T>;", which 10515 // is possibly well-formed? Who even knows? 10516 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10517 Diag(Loc, diag::err_tagless_friend_type_template) 10518 << DS.getSourceRange(); 10519 return 0; 10520 } 10521 10522 // C++98 [class.friend]p1: A friend of a class is a function 10523 // or class that is not a member of the class . . . 10524 // This is fixed in DR77, which just barely didn't make the C++03 10525 // deadline. It's also a very silly restriction that seriously 10526 // affects inner classes and which nobody else seems to implement; 10527 // thus we never diagnose it, not even in -pedantic. 10528 // 10529 // But note that we could warn about it: it's always useless to 10530 // friend one of your own members (it's not, however, worthless to 10531 // friend a member of an arbitrary specialization of your template). 10532 10533 Decl *D; 10534 if (unsigned NumTempParamLists = TempParams.size()) 10535 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10536 NumTempParamLists, 10537 TempParams.data(), 10538 TSI, 10539 DS.getFriendSpecLoc()); 10540 else 10541 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10542 10543 if (!D) 10544 return 0; 10545 10546 D->setAccess(AS_public); 10547 CurContext->addDecl(D); 10548 10549 return D; 10550} 10551 10552NamedDecl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10553 MultiTemplateParamsArg TemplateParams) { 10554 const DeclSpec &DS = D.getDeclSpec(); 10555 10556 assert(DS.isFriendSpecified()); 10557 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10558 10559 SourceLocation Loc = D.getIdentifierLoc(); 10560 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10561 10562 // C++ [class.friend]p1 10563 // A friend of a class is a function or class.... 10564 // Note that this sees through typedefs, which is intended. 10565 // It *doesn't* see through dependent types, which is correct 10566 // according to [temp.arg.type]p3: 10567 // If a declaration acquires a function type through a 10568 // type dependent on a template-parameter and this causes 10569 // a declaration that does not use the syntactic form of a 10570 // function declarator to have a function type, the program 10571 // is ill-formed. 10572 if (!TInfo->getType()->isFunctionType()) { 10573 Diag(Loc, diag::err_unexpected_friend); 10574 10575 // It might be worthwhile to try to recover by creating an 10576 // appropriate declaration. 10577 return 0; 10578 } 10579 10580 // C++ [namespace.memdef]p3 10581 // - If a friend declaration in a non-local class first declares a 10582 // class or function, the friend class or function is a member 10583 // of the innermost enclosing namespace. 10584 // - The name of the friend is not found by simple name lookup 10585 // until a matching declaration is provided in that namespace 10586 // scope (either before or after the class declaration granting 10587 // friendship). 10588 // - If a friend function is called, its name may be found by the 10589 // name lookup that considers functions from namespaces and 10590 // classes associated with the types of the function arguments. 10591 // - When looking for a prior declaration of a class or a function 10592 // declared as a friend, scopes outside the innermost enclosing 10593 // namespace scope are not considered. 10594 10595 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10596 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10597 DeclarationName Name = NameInfo.getName(); 10598 assert(Name); 10599 10600 // Check for unexpanded parameter packs. 10601 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10602 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10603 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10604 return 0; 10605 10606 // The context we found the declaration in, or in which we should 10607 // create the declaration. 10608 DeclContext *DC; 10609 Scope *DCScope = S; 10610 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10611 ForRedeclaration); 10612 10613 // FIXME: there are different rules in local classes 10614 10615 // There are four cases here. 10616 // - There's no scope specifier, in which case we just go to the 10617 // appropriate scope and look for a function or function template 10618 // there as appropriate. 10619 // Recover from invalid scope qualifiers as if they just weren't there. 10620 if (SS.isInvalid() || !SS.isSet()) { 10621 // C++0x [namespace.memdef]p3: 10622 // If the name in a friend declaration is neither qualified nor 10623 // a template-id and the declaration is a function or an 10624 // elaborated-type-specifier, the lookup to determine whether 10625 // the entity has been previously declared shall not consider 10626 // any scopes outside the innermost enclosing namespace. 10627 // C++0x [class.friend]p11: 10628 // If a friend declaration appears in a local class and the name 10629 // specified is an unqualified name, a prior declaration is 10630 // looked up without considering scopes that are outside the 10631 // innermost enclosing non-class scope. For a friend function 10632 // declaration, if there is no prior declaration, the program is 10633 // ill-formed. 10634 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10635 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10636 10637 // Find the appropriate context according to the above. 10638 DC = CurContext; 10639 while (true) { 10640 // Skip class contexts. If someone can cite chapter and verse 10641 // for this behavior, that would be nice --- it's what GCC and 10642 // EDG do, and it seems like a reasonable intent, but the spec 10643 // really only says that checks for unqualified existing 10644 // declarations should stop at the nearest enclosing namespace, 10645 // not that they should only consider the nearest enclosing 10646 // namespace. 10647 while (DC->isRecord() || DC->isTransparentContext()) 10648 DC = DC->getParent(); 10649 10650 LookupQualifiedName(Previous, DC); 10651 10652 // TODO: decide what we think about using declarations. 10653 if (isLocal || !Previous.empty()) 10654 break; 10655 10656 if (isTemplateId) { 10657 if (isa<TranslationUnitDecl>(DC)) break; 10658 } else { 10659 if (DC->isFileContext()) break; 10660 } 10661 DC = DC->getParent(); 10662 } 10663 10664 // C++ [class.friend]p1: A friend of a class is a function or 10665 // class that is not a member of the class . . . 10666 // C++11 changes this for both friend types and functions. 10667 // Most C++ 98 compilers do seem to give an error here, so 10668 // we do, too. 10669 if (!Previous.empty() && DC->Equals(CurContext)) 10670 Diag(DS.getFriendSpecLoc(), 10671 getLangOpts().CPlusPlus11 ? 10672 diag::warn_cxx98_compat_friend_is_member : 10673 diag::err_friend_is_member); 10674 10675 DCScope = getScopeForDeclContext(S, DC); 10676 10677 // C++ [class.friend]p6: 10678 // A function can be defined in a friend declaration of a class if and 10679 // only if the class is a non-local class (9.8), the function name is 10680 // unqualified, and the function has namespace scope. 10681 if (isLocal && D.isFunctionDefinition()) { 10682 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10683 } 10684 10685 // - There's a non-dependent scope specifier, in which case we 10686 // compute it and do a previous lookup there for a function 10687 // or function template. 10688 } else if (!SS.getScopeRep()->isDependent()) { 10689 DC = computeDeclContext(SS); 10690 if (!DC) return 0; 10691 10692 if (RequireCompleteDeclContext(SS, DC)) return 0; 10693 10694 LookupQualifiedName(Previous, DC); 10695 10696 // Ignore things found implicitly in the wrong scope. 10697 // TODO: better diagnostics for this case. Suggesting the right 10698 // qualified scope would be nice... 10699 LookupResult::Filter F = Previous.makeFilter(); 10700 while (F.hasNext()) { 10701 NamedDecl *D = F.next(); 10702 if (!DC->InEnclosingNamespaceSetOf( 10703 D->getDeclContext()->getRedeclContext())) 10704 F.erase(); 10705 } 10706 F.done(); 10707 10708 if (Previous.empty()) { 10709 D.setInvalidType(); 10710 Diag(Loc, diag::err_qualified_friend_not_found) 10711 << Name << TInfo->getType(); 10712 return 0; 10713 } 10714 10715 // C++ [class.friend]p1: A friend of a class is a function or 10716 // class that is not a member of the class . . . 10717 if (DC->Equals(CurContext)) 10718 Diag(DS.getFriendSpecLoc(), 10719 getLangOpts().CPlusPlus11 ? 10720 diag::warn_cxx98_compat_friend_is_member : 10721 diag::err_friend_is_member); 10722 10723 if (D.isFunctionDefinition()) { 10724 // C++ [class.friend]p6: 10725 // A function can be defined in a friend declaration of a class if and 10726 // only if the class is a non-local class (9.8), the function name is 10727 // unqualified, and the function has namespace scope. 10728 SemaDiagnosticBuilder DB 10729 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10730 10731 DB << SS.getScopeRep(); 10732 if (DC->isFileContext()) 10733 DB << FixItHint::CreateRemoval(SS.getRange()); 10734 SS.clear(); 10735 } 10736 10737 // - There's a scope specifier that does not match any template 10738 // parameter lists, in which case we use some arbitrary context, 10739 // create a method or method template, and wait for instantiation. 10740 // - There's a scope specifier that does match some template 10741 // parameter lists, which we don't handle right now. 10742 } else { 10743 if (D.isFunctionDefinition()) { 10744 // C++ [class.friend]p6: 10745 // A function can be defined in a friend declaration of a class if and 10746 // only if the class is a non-local class (9.8), the function name is 10747 // unqualified, and the function has namespace scope. 10748 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10749 << SS.getScopeRep(); 10750 } 10751 10752 DC = CurContext; 10753 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10754 } 10755 10756 if (!DC->isRecord()) { 10757 // This implies that it has to be an operator or function. 10758 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10759 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10760 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10761 Diag(Loc, diag::err_introducing_special_friend) << 10762 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10763 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10764 return 0; 10765 } 10766 } 10767 10768 // FIXME: This is an egregious hack to cope with cases where the scope stack 10769 // does not contain the declaration context, i.e., in an out-of-line 10770 // definition of a class. 10771 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10772 if (!DCScope) { 10773 FakeDCScope.setEntity(DC); 10774 DCScope = &FakeDCScope; 10775 } 10776 10777 bool AddToScope = true; 10778 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10779 TemplateParams, AddToScope); 10780 if (!ND) return 0; 10781 10782 assert(ND->getDeclContext() == DC); 10783 assert(ND->getLexicalDeclContext() == CurContext); 10784 10785 // Add the function declaration to the appropriate lookup tables, 10786 // adjusting the redeclarations list as necessary. We don't 10787 // want to do this yet if the friending class is dependent. 10788 // 10789 // Also update the scope-based lookup if the target context's 10790 // lookup context is in lexical scope. 10791 if (!CurContext->isDependentContext()) { 10792 DC = DC->getRedeclContext(); 10793 DC->makeDeclVisibleInContext(ND); 10794 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10795 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10796 } 10797 10798 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10799 D.getIdentifierLoc(), ND, 10800 DS.getFriendSpecLoc()); 10801 FrD->setAccess(AS_public); 10802 CurContext->addDecl(FrD); 10803 10804 if (ND->isInvalidDecl()) { 10805 FrD->setInvalidDecl(); 10806 } else { 10807 if (DC->isRecord()) CheckFriendAccess(ND); 10808 10809 FunctionDecl *FD; 10810 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10811 FD = FTD->getTemplatedDecl(); 10812 else 10813 FD = cast<FunctionDecl>(ND); 10814 10815 // Mark templated-scope function declarations as unsupported. 10816 if (FD->getNumTemplateParameterLists()) 10817 FrD->setUnsupportedFriend(true); 10818 } 10819 10820 return ND; 10821} 10822 10823void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10824 AdjustDeclIfTemplate(Dcl); 10825 10826 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10827 if (!Fn) { 10828 Diag(DelLoc, diag::err_deleted_non_function); 10829 return; 10830 } 10831 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10832 // Don't consider the implicit declaration we generate for explicit 10833 // specializations. FIXME: Do not generate these implicit declarations. 10834 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 10835 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 10836 Diag(DelLoc, diag::err_deleted_decl_not_first); 10837 Diag(Prev->getLocation(), diag::note_previous_declaration); 10838 } 10839 // If the declaration wasn't the first, we delete the function anyway for 10840 // recovery. 10841 } 10842 Fn->setDeletedAsWritten(); 10843} 10844 10845void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10846 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10847 10848 if (MD) { 10849 if (MD->getParent()->isDependentType()) { 10850 MD->setDefaulted(); 10851 MD->setExplicitlyDefaulted(); 10852 return; 10853 } 10854 10855 CXXSpecialMember Member = getSpecialMember(MD); 10856 if (Member == CXXInvalid) { 10857 Diag(DefaultLoc, diag::err_default_special_members); 10858 return; 10859 } 10860 10861 MD->setDefaulted(); 10862 MD->setExplicitlyDefaulted(); 10863 10864 // If this definition appears within the record, do the checking when 10865 // the record is complete. 10866 const FunctionDecl *Primary = MD; 10867 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern()) 10868 // Find the uninstantiated declaration that actually had the '= default' 10869 // on it. 10870 Pattern->isDefined(Primary); 10871 10872 if (Primary == Primary->getCanonicalDecl()) 10873 return; 10874 10875 CheckExplicitlyDefaultedSpecialMember(MD); 10876 10877 // The exception specification is needed because we are defining the 10878 // function. 10879 ResolveExceptionSpec(DefaultLoc, 10880 MD->getType()->castAs<FunctionProtoType>()); 10881 10882 switch (Member) { 10883 case CXXDefaultConstructor: { 10884 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10885 if (!CD->isInvalidDecl()) 10886 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10887 break; 10888 } 10889 10890 case CXXCopyConstructor: { 10891 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10892 if (!CD->isInvalidDecl()) 10893 DefineImplicitCopyConstructor(DefaultLoc, CD); 10894 break; 10895 } 10896 10897 case CXXCopyAssignment: { 10898 if (!MD->isInvalidDecl()) 10899 DefineImplicitCopyAssignment(DefaultLoc, MD); 10900 break; 10901 } 10902 10903 case CXXDestructor: { 10904 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10905 if (!DD->isInvalidDecl()) 10906 DefineImplicitDestructor(DefaultLoc, DD); 10907 break; 10908 } 10909 10910 case CXXMoveConstructor: { 10911 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10912 if (!CD->isInvalidDecl()) 10913 DefineImplicitMoveConstructor(DefaultLoc, CD); 10914 break; 10915 } 10916 10917 case CXXMoveAssignment: { 10918 if (!MD->isInvalidDecl()) 10919 DefineImplicitMoveAssignment(DefaultLoc, MD); 10920 break; 10921 } 10922 10923 case CXXInvalid: 10924 llvm_unreachable("Invalid special member."); 10925 } 10926 } else { 10927 Diag(DefaultLoc, diag::err_default_special_members); 10928 } 10929} 10930 10931static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10932 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10933 Stmt *SubStmt = *CI; 10934 if (!SubStmt) 10935 continue; 10936 if (isa<ReturnStmt>(SubStmt)) 10937 Self.Diag(SubStmt->getLocStart(), 10938 diag::err_return_in_constructor_handler); 10939 if (!isa<Expr>(SubStmt)) 10940 SearchForReturnInStmt(Self, SubStmt); 10941 } 10942} 10943 10944void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10945 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10946 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10947 SearchForReturnInStmt(*this, Handler); 10948 } 10949} 10950 10951bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 10952 const CXXMethodDecl *Old) { 10953 const FunctionType *NewFT = New->getType()->getAs<FunctionType>(); 10954 const FunctionType *OldFT = Old->getType()->getAs<FunctionType>(); 10955 10956 CallingConv NewCC = NewFT->getCallConv(), OldCC = OldFT->getCallConv(); 10957 10958 // If the calling conventions match, everything is fine 10959 if (NewCC == OldCC) 10960 return false; 10961 10962 // If either of the calling conventions are set to "default", we need to pick 10963 // something more sensible based on the target. This supports code where the 10964 // one method explicitly sets thiscall, and another has no explicit calling 10965 // convention. 10966 CallingConv Default = 10967 Context.getTargetInfo().getDefaultCallingConv(TargetInfo::CCMT_Member); 10968 if (NewCC == CC_Default) 10969 NewCC = Default; 10970 if (OldCC == CC_Default) 10971 OldCC = Default; 10972 10973 // If the calling conventions still don't match, then report the error 10974 if (NewCC != OldCC) { 10975 Diag(New->getLocation(), 10976 diag::err_conflicting_overriding_cc_attributes) 10977 << New->getDeclName() << New->getType() << Old->getType(); 10978 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10979 return true; 10980 } 10981 10982 return false; 10983} 10984 10985bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10986 const CXXMethodDecl *Old) { 10987 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10988 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10989 10990 if (Context.hasSameType(NewTy, OldTy) || 10991 NewTy->isDependentType() || OldTy->isDependentType()) 10992 return false; 10993 10994 // Check if the return types are covariant 10995 QualType NewClassTy, OldClassTy; 10996 10997 /// Both types must be pointers or references to classes. 10998 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10999 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 11000 NewClassTy = NewPT->getPointeeType(); 11001 OldClassTy = OldPT->getPointeeType(); 11002 } 11003 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 11004 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 11005 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 11006 NewClassTy = NewRT->getPointeeType(); 11007 OldClassTy = OldRT->getPointeeType(); 11008 } 11009 } 11010 } 11011 11012 // The return types aren't either both pointers or references to a class type. 11013 if (NewClassTy.isNull()) { 11014 Diag(New->getLocation(), 11015 diag::err_different_return_type_for_overriding_virtual_function) 11016 << New->getDeclName() << NewTy << OldTy; 11017 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11018 11019 return true; 11020 } 11021 11022 // C++ [class.virtual]p6: 11023 // If the return type of D::f differs from the return type of B::f, the 11024 // class type in the return type of D::f shall be complete at the point of 11025 // declaration of D::f or shall be the class type D. 11026 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 11027 if (!RT->isBeingDefined() && 11028 RequireCompleteType(New->getLocation(), NewClassTy, 11029 diag::err_covariant_return_incomplete, 11030 New->getDeclName())) 11031 return true; 11032 } 11033 11034 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 11035 // Check if the new class derives from the old class. 11036 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 11037 Diag(New->getLocation(), 11038 diag::err_covariant_return_not_derived) 11039 << New->getDeclName() << NewTy << OldTy; 11040 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11041 return true; 11042 } 11043 11044 // Check if we the conversion from derived to base is valid. 11045 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 11046 diag::err_covariant_return_inaccessible_base, 11047 diag::err_covariant_return_ambiguous_derived_to_base_conv, 11048 // FIXME: Should this point to the return type? 11049 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 11050 // FIXME: this note won't trigger for delayed access control 11051 // diagnostics, and it's impossible to get an undelayed error 11052 // here from access control during the original parse because 11053 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 11054 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11055 return true; 11056 } 11057 } 11058 11059 // The qualifiers of the return types must be the same. 11060 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 11061 Diag(New->getLocation(), 11062 diag::err_covariant_return_type_different_qualifications) 11063 << New->getDeclName() << NewTy << OldTy; 11064 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11065 return true; 11066 }; 11067 11068 11069 // The new class type must have the same or less qualifiers as the old type. 11070 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 11071 Diag(New->getLocation(), 11072 diag::err_covariant_return_type_class_type_more_qualified) 11073 << New->getDeclName() << NewTy << OldTy; 11074 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11075 return true; 11076 }; 11077 11078 return false; 11079} 11080 11081/// \brief Mark the given method pure. 11082/// 11083/// \param Method the method to be marked pure. 11084/// 11085/// \param InitRange the source range that covers the "0" initializer. 11086bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 11087 SourceLocation EndLoc = InitRange.getEnd(); 11088 if (EndLoc.isValid()) 11089 Method->setRangeEnd(EndLoc); 11090 11091 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 11092 Method->setPure(); 11093 return false; 11094 } 11095 11096 if (!Method->isInvalidDecl()) 11097 Diag(Method->getLocation(), diag::err_non_virtual_pure) 11098 << Method->getDeclName() << InitRange; 11099 return true; 11100} 11101 11102/// \brief Determine whether the given declaration is a static data member. 11103static bool isStaticDataMember(Decl *D) { 11104 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 11105 if (!Var) 11106 return false; 11107 11108 return Var->isStaticDataMember(); 11109} 11110/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 11111/// an initializer for the out-of-line declaration 'Dcl'. The scope 11112/// is a fresh scope pushed for just this purpose. 11113/// 11114/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 11115/// static data member of class X, names should be looked up in the scope of 11116/// class X. 11117void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 11118 // If there is no declaration, there was an error parsing it. 11119 if (D == 0 || D->isInvalidDecl()) return; 11120 11121 // We should only get called for declarations with scope specifiers, like: 11122 // int foo::bar; 11123 assert(D->isOutOfLine()); 11124 EnterDeclaratorContext(S, D->getDeclContext()); 11125 11126 // If we are parsing the initializer for a static data member, push a 11127 // new expression evaluation context that is associated with this static 11128 // data member. 11129 if (isStaticDataMember(D)) 11130 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 11131} 11132 11133/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 11134/// initializer for the out-of-line declaration 'D'. 11135void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 11136 // If there is no declaration, there was an error parsing it. 11137 if (D == 0 || D->isInvalidDecl()) return; 11138 11139 if (isStaticDataMember(D)) 11140 PopExpressionEvaluationContext(); 11141 11142 assert(D->isOutOfLine()); 11143 ExitDeclaratorContext(S); 11144} 11145 11146/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 11147/// C++ if/switch/while/for statement. 11148/// e.g: "if (int x = f()) {...}" 11149DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 11150 // C++ 6.4p2: 11151 // The declarator shall not specify a function or an array. 11152 // The type-specifier-seq shall not contain typedef and shall not declare a 11153 // new class or enumeration. 11154 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 11155 "Parser allowed 'typedef' as storage class of condition decl."); 11156 11157 Decl *Dcl = ActOnDeclarator(S, D); 11158 if (!Dcl) 11159 return true; 11160 11161 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 11162 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 11163 << D.getSourceRange(); 11164 return true; 11165 } 11166 11167 return Dcl; 11168} 11169 11170void Sema::LoadExternalVTableUses() { 11171 if (!ExternalSource) 11172 return; 11173 11174 SmallVector<ExternalVTableUse, 4> VTables; 11175 ExternalSource->ReadUsedVTables(VTables); 11176 SmallVector<VTableUse, 4> NewUses; 11177 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 11178 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 11179 = VTablesUsed.find(VTables[I].Record); 11180 // Even if a definition wasn't required before, it may be required now. 11181 if (Pos != VTablesUsed.end()) { 11182 if (!Pos->second && VTables[I].DefinitionRequired) 11183 Pos->second = true; 11184 continue; 11185 } 11186 11187 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 11188 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 11189 } 11190 11191 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 11192} 11193 11194void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 11195 bool DefinitionRequired) { 11196 // Ignore any vtable uses in unevaluated operands or for classes that do 11197 // not have a vtable. 11198 if (!Class->isDynamicClass() || Class->isDependentContext() || 11199 CurContext->isDependentContext() || 11200 ExprEvalContexts.back().Context == Unevaluated) 11201 return; 11202 11203 // Try to insert this class into the map. 11204 LoadExternalVTableUses(); 11205 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 11206 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 11207 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 11208 if (!Pos.second) { 11209 // If we already had an entry, check to see if we are promoting this vtable 11210 // to required a definition. If so, we need to reappend to the VTableUses 11211 // list, since we may have already processed the first entry. 11212 if (DefinitionRequired && !Pos.first->second) { 11213 Pos.first->second = true; 11214 } else { 11215 // Otherwise, we can early exit. 11216 return; 11217 } 11218 } 11219 11220 // Local classes need to have their virtual members marked 11221 // immediately. For all other classes, we mark their virtual members 11222 // at the end of the translation unit. 11223 if (Class->isLocalClass()) 11224 MarkVirtualMembersReferenced(Loc, Class); 11225 else 11226 VTableUses.push_back(std::make_pair(Class, Loc)); 11227} 11228 11229bool Sema::DefineUsedVTables() { 11230 LoadExternalVTableUses(); 11231 if (VTableUses.empty()) 11232 return false; 11233 11234 // Note: The VTableUses vector could grow as a result of marking 11235 // the members of a class as "used", so we check the size each 11236 // time through the loop and prefer indices (which are stable) to 11237 // iterators (which are not). 11238 bool DefinedAnything = false; 11239 for (unsigned I = 0; I != VTableUses.size(); ++I) { 11240 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 11241 if (!Class) 11242 continue; 11243 11244 SourceLocation Loc = VTableUses[I].second; 11245 11246 bool DefineVTable = true; 11247 11248 // If this class has a key function, but that key function is 11249 // defined in another translation unit, we don't need to emit the 11250 // vtable even though we're using it. 11251 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 11252 if (KeyFunction && !KeyFunction->hasBody()) { 11253 switch (KeyFunction->getTemplateSpecializationKind()) { 11254 case TSK_Undeclared: 11255 case TSK_ExplicitSpecialization: 11256 case TSK_ExplicitInstantiationDeclaration: 11257 // The key function is in another translation unit. 11258 DefineVTable = false; 11259 break; 11260 11261 case TSK_ExplicitInstantiationDefinition: 11262 case TSK_ImplicitInstantiation: 11263 // We will be instantiating the key function. 11264 break; 11265 } 11266 } else if (!KeyFunction) { 11267 // If we have a class with no key function that is the subject 11268 // of an explicit instantiation declaration, suppress the 11269 // vtable; it will live with the explicit instantiation 11270 // definition. 11271 bool IsExplicitInstantiationDeclaration 11272 = Class->getTemplateSpecializationKind() 11273 == TSK_ExplicitInstantiationDeclaration; 11274 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 11275 REnd = Class->redecls_end(); 11276 R != REnd; ++R) { 11277 TemplateSpecializationKind TSK 11278 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 11279 if (TSK == TSK_ExplicitInstantiationDeclaration) 11280 IsExplicitInstantiationDeclaration = true; 11281 else if (TSK == TSK_ExplicitInstantiationDefinition) { 11282 IsExplicitInstantiationDeclaration = false; 11283 break; 11284 } 11285 } 11286 11287 if (IsExplicitInstantiationDeclaration) 11288 DefineVTable = false; 11289 } 11290 11291 // The exception specifications for all virtual members may be needed even 11292 // if we are not providing an authoritative form of the vtable in this TU. 11293 // We may choose to emit it available_externally anyway. 11294 if (!DefineVTable) { 11295 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 11296 continue; 11297 } 11298 11299 // Mark all of the virtual members of this class as referenced, so 11300 // that we can build a vtable. Then, tell the AST consumer that a 11301 // vtable for this class is required. 11302 DefinedAnything = true; 11303 MarkVirtualMembersReferenced(Loc, Class); 11304 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 11305 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 11306 11307 // Optionally warn if we're emitting a weak vtable. 11308 if (Class->getLinkage() == ExternalLinkage && 11309 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 11310 const FunctionDecl *KeyFunctionDef = 0; 11311 if (!KeyFunction || 11312 (KeyFunction->hasBody(KeyFunctionDef) && 11313 KeyFunctionDef->isInlined())) 11314 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 11315 TSK_ExplicitInstantiationDefinition 11316 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 11317 << Class; 11318 } 11319 } 11320 VTableUses.clear(); 11321 11322 return DefinedAnything; 11323} 11324 11325void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 11326 const CXXRecordDecl *RD) { 11327 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 11328 E = RD->method_end(); I != E; ++I) 11329 if ((*I)->isVirtual() && !(*I)->isPure()) 11330 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 11331} 11332 11333void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 11334 const CXXRecordDecl *RD) { 11335 // Mark all functions which will appear in RD's vtable as used. 11336 CXXFinalOverriderMap FinalOverriders; 11337 RD->getFinalOverriders(FinalOverriders); 11338 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 11339 E = FinalOverriders.end(); 11340 I != E; ++I) { 11341 for (OverridingMethods::const_iterator OI = I->second.begin(), 11342 OE = I->second.end(); 11343 OI != OE; ++OI) { 11344 assert(OI->second.size() > 0 && "no final overrider"); 11345 CXXMethodDecl *Overrider = OI->second.front().Method; 11346 11347 // C++ [basic.def.odr]p2: 11348 // [...] A virtual member function is used if it is not pure. [...] 11349 if (!Overrider->isPure()) 11350 MarkFunctionReferenced(Loc, Overrider); 11351 } 11352 } 11353 11354 // Only classes that have virtual bases need a VTT. 11355 if (RD->getNumVBases() == 0) 11356 return; 11357 11358 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 11359 e = RD->bases_end(); i != e; ++i) { 11360 const CXXRecordDecl *Base = 11361 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 11362 if (Base->getNumVBases() == 0) 11363 continue; 11364 MarkVirtualMembersReferenced(Loc, Base); 11365 } 11366} 11367 11368/// SetIvarInitializers - This routine builds initialization ASTs for the 11369/// Objective-C implementation whose ivars need be initialized. 11370void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 11371 if (!getLangOpts().CPlusPlus) 11372 return; 11373 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 11374 SmallVector<ObjCIvarDecl*, 8> ivars; 11375 CollectIvarsToConstructOrDestruct(OID, ivars); 11376 if (ivars.empty()) 11377 return; 11378 SmallVector<CXXCtorInitializer*, 32> AllToInit; 11379 for (unsigned i = 0; i < ivars.size(); i++) { 11380 FieldDecl *Field = ivars[i]; 11381 if (Field->isInvalidDecl()) 11382 continue; 11383 11384 CXXCtorInitializer *Member; 11385 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 11386 InitializationKind InitKind = 11387 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 11388 11389 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 11390 ExprResult MemberInit = 11391 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 11392 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 11393 // Note, MemberInit could actually come back empty if no initialization 11394 // is required (e.g., because it would call a trivial default constructor) 11395 if (!MemberInit.get() || MemberInit.isInvalid()) 11396 continue; 11397 11398 Member = 11399 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 11400 SourceLocation(), 11401 MemberInit.takeAs<Expr>(), 11402 SourceLocation()); 11403 AllToInit.push_back(Member); 11404 11405 // Be sure that the destructor is accessible and is marked as referenced. 11406 if (const RecordType *RecordTy 11407 = Context.getBaseElementType(Field->getType()) 11408 ->getAs<RecordType>()) { 11409 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 11410 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 11411 MarkFunctionReferenced(Field->getLocation(), Destructor); 11412 CheckDestructorAccess(Field->getLocation(), Destructor, 11413 PDiag(diag::err_access_dtor_ivar) 11414 << Context.getBaseElementType(Field->getType())); 11415 } 11416 } 11417 } 11418 ObjCImplementation->setIvarInitializers(Context, 11419 AllToInit.data(), AllToInit.size()); 11420 } 11421} 11422 11423static 11424void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 11425 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 11426 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 11427 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 11428 Sema &S) { 11429 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11430 CE = Current.end(); 11431 if (Ctor->isInvalidDecl()) 11432 return; 11433 11434 CXXConstructorDecl *Target = Ctor->getTargetConstructor(); 11435 11436 // Target may not be determinable yet, for instance if this is a dependent 11437 // call in an uninstantiated template. 11438 if (Target) { 11439 const FunctionDecl *FNTarget = 0; 11440 (void)Target->hasBody(FNTarget); 11441 Target = const_cast<CXXConstructorDecl*>( 11442 cast_or_null<CXXConstructorDecl>(FNTarget)); 11443 } 11444 11445 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 11446 // Avoid dereferencing a null pointer here. 11447 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 11448 11449 if (!Current.insert(Canonical)) 11450 return; 11451 11452 // We know that beyond here, we aren't chaining into a cycle. 11453 if (!Target || !Target->isDelegatingConstructor() || 11454 Target->isInvalidDecl() || Valid.count(TCanonical)) { 11455 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11456 Valid.insert(*CI); 11457 Current.clear(); 11458 // We've hit a cycle. 11459 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 11460 Current.count(TCanonical)) { 11461 // If we haven't diagnosed this cycle yet, do so now. 11462 if (!Invalid.count(TCanonical)) { 11463 S.Diag((*Ctor->init_begin())->getSourceLocation(), 11464 diag::warn_delegating_ctor_cycle) 11465 << Ctor; 11466 11467 // Don't add a note for a function delegating directly to itself. 11468 if (TCanonical != Canonical) 11469 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11470 11471 CXXConstructorDecl *C = Target; 11472 while (C->getCanonicalDecl() != Canonical) { 11473 const FunctionDecl *FNTarget = 0; 11474 (void)C->getTargetConstructor()->hasBody(FNTarget); 11475 assert(FNTarget && "Ctor cycle through bodiless function"); 11476 11477 C = const_cast<CXXConstructorDecl*>( 11478 cast<CXXConstructorDecl>(FNTarget)); 11479 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11480 } 11481 } 11482 11483 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11484 Invalid.insert(*CI); 11485 Current.clear(); 11486 } else { 11487 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11488 } 11489} 11490 11491 11492void Sema::CheckDelegatingCtorCycles() { 11493 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11494 11495 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11496 CE = Current.end(); 11497 11498 for (DelegatingCtorDeclsType::iterator 11499 I = DelegatingCtorDecls.begin(ExternalSource), 11500 E = DelegatingCtorDecls.end(); 11501 I != E; ++I) 11502 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11503 11504 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11505 (*CI)->setInvalidDecl(); 11506} 11507 11508namespace { 11509 /// \brief AST visitor that finds references to the 'this' expression. 11510 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 11511 Sema &S; 11512 11513 public: 11514 explicit FindCXXThisExpr(Sema &S) : S(S) { } 11515 11516 bool VisitCXXThisExpr(CXXThisExpr *E) { 11517 S.Diag(E->getLocation(), diag::err_this_static_member_func) 11518 << E->isImplicit(); 11519 return false; 11520 } 11521 }; 11522} 11523 11524bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 11525 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11526 if (!TSInfo) 11527 return false; 11528 11529 TypeLoc TL = TSInfo->getTypeLoc(); 11530 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11531 if (!ProtoTL) 11532 return false; 11533 11534 // C++11 [expr.prim.general]p3: 11535 // [The expression this] shall not appear before the optional 11536 // cv-qualifier-seq and it shall not appear within the declaration of a 11537 // static member function (although its type and value category are defined 11538 // within a static member function as they are within a non-static member 11539 // function). [ Note: this is because declaration matching does not occur 11540 // until the complete declarator is known. - end note ] 11541 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11542 FindCXXThisExpr Finder(*this); 11543 11544 // If the return type came after the cv-qualifier-seq, check it now. 11545 if (Proto->hasTrailingReturn() && 11546 !Finder.TraverseTypeLoc(ProtoTL->getResultLoc())) 11547 return true; 11548 11549 // Check the exception specification. 11550 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 11551 return true; 11552 11553 return checkThisInStaticMemberFunctionAttributes(Method); 11554} 11555 11556bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 11557 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11558 if (!TSInfo) 11559 return false; 11560 11561 TypeLoc TL = TSInfo->getTypeLoc(); 11562 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11563 if (!ProtoTL) 11564 return false; 11565 11566 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11567 FindCXXThisExpr Finder(*this); 11568 11569 switch (Proto->getExceptionSpecType()) { 11570 case EST_Uninstantiated: 11571 case EST_Unevaluated: 11572 case EST_BasicNoexcept: 11573 case EST_DynamicNone: 11574 case EST_MSAny: 11575 case EST_None: 11576 break; 11577 11578 case EST_ComputedNoexcept: 11579 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11580 return true; 11581 11582 case EST_Dynamic: 11583 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11584 EEnd = Proto->exception_end(); 11585 E != EEnd; ++E) { 11586 if (!Finder.TraverseType(*E)) 11587 return true; 11588 } 11589 break; 11590 } 11591 11592 return false; 11593} 11594 11595bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11596 FindCXXThisExpr Finder(*this); 11597 11598 // Check attributes. 11599 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11600 A != AEnd; ++A) { 11601 // FIXME: This should be emitted by tblgen. 11602 Expr *Arg = 0; 11603 ArrayRef<Expr *> Args; 11604 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11605 Arg = G->getArg(); 11606 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11607 Arg = G->getArg(); 11608 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11609 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11610 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11611 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11612 else if (ExclusiveLockFunctionAttr *ELF 11613 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11614 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11615 else if (SharedLockFunctionAttr *SLF 11616 = dyn_cast<SharedLockFunctionAttr>(*A)) 11617 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11618 else if (ExclusiveTrylockFunctionAttr *ETLF 11619 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11620 Arg = ETLF->getSuccessValue(); 11621 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11622 } else if (SharedTrylockFunctionAttr *STLF 11623 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11624 Arg = STLF->getSuccessValue(); 11625 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11626 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11627 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11628 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11629 Arg = LR->getArg(); 11630 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11631 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11632 else if (ExclusiveLocksRequiredAttr *ELR 11633 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11634 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11635 else if (SharedLocksRequiredAttr *SLR 11636 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11637 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11638 11639 if (Arg && !Finder.TraverseStmt(Arg)) 11640 return true; 11641 11642 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11643 if (!Finder.TraverseStmt(Args[I])) 11644 return true; 11645 } 11646 } 11647 11648 return false; 11649} 11650 11651void 11652Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 11653 ArrayRef<ParsedType> DynamicExceptions, 11654 ArrayRef<SourceRange> DynamicExceptionRanges, 11655 Expr *NoexceptExpr, 11656 SmallVectorImpl<QualType> &Exceptions, 11657 FunctionProtoType::ExtProtoInfo &EPI) { 11658 Exceptions.clear(); 11659 EPI.ExceptionSpecType = EST; 11660 if (EST == EST_Dynamic) { 11661 Exceptions.reserve(DynamicExceptions.size()); 11662 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 11663 // FIXME: Preserve type source info. 11664 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 11665 11666 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 11667 collectUnexpandedParameterPacks(ET, Unexpanded); 11668 if (!Unexpanded.empty()) { 11669 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 11670 UPPC_ExceptionType, 11671 Unexpanded); 11672 continue; 11673 } 11674 11675 // Check that the type is valid for an exception spec, and 11676 // drop it if not. 11677 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 11678 Exceptions.push_back(ET); 11679 } 11680 EPI.NumExceptions = Exceptions.size(); 11681 EPI.Exceptions = Exceptions.data(); 11682 return; 11683 } 11684 11685 if (EST == EST_ComputedNoexcept) { 11686 // If an error occurred, there's no expression here. 11687 if (NoexceptExpr) { 11688 assert((NoexceptExpr->isTypeDependent() || 11689 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 11690 Context.BoolTy) && 11691 "Parser should have made sure that the expression is boolean"); 11692 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 11693 EPI.ExceptionSpecType = EST_BasicNoexcept; 11694 return; 11695 } 11696 11697 if (!NoexceptExpr->isValueDependent()) 11698 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 11699 diag::err_noexcept_needs_constant_expression, 11700 /*AllowFold*/ false).take(); 11701 EPI.NoexceptExpr = NoexceptExpr; 11702 } 11703 return; 11704 } 11705} 11706 11707/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11708Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11709 // Implicitly declared functions (e.g. copy constructors) are 11710 // __host__ __device__ 11711 if (D->isImplicit()) 11712 return CFT_HostDevice; 11713 11714 if (D->hasAttr<CUDAGlobalAttr>()) 11715 return CFT_Global; 11716 11717 if (D->hasAttr<CUDADeviceAttr>()) { 11718 if (D->hasAttr<CUDAHostAttr>()) 11719 return CFT_HostDevice; 11720 else 11721 return CFT_Device; 11722 } 11723 11724 return CFT_Host; 11725} 11726 11727bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11728 CUDAFunctionTarget CalleeTarget) { 11729 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11730 // Callable from the device only." 11731 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11732 return true; 11733 11734 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11735 // Callable from the host only." 11736 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11737 // Callable from the host only." 11738 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11739 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11740 return true; 11741 11742 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11743 return true; 11744 11745 return false; 11746} 11747