SemaDeclCXX.cpp revision b8abff66a8d30356c82314c4734c692cdd479e5e
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "clang/AST/ASTConsumer.h" 21#include "clang/AST/ASTContext.h" 22#include "clang/AST/ASTMutationListener.h" 23#include "clang/AST/CharUnits.h" 24#include "clang/AST/CXXInheritance.h" 25#include "clang/AST/DeclVisitor.h" 26#include "clang/AST/EvaluatedExprVisitor.h" 27#include "clang/AST/ExprCXX.h" 28#include "clang/AST/RecordLayout.h" 29#include "clang/AST/RecursiveASTVisitor.h" 30#include "clang/AST/StmtVisitor.h" 31#include "clang/AST/TypeLoc.h" 32#include "clang/AST/TypeOrdering.h" 33#include "clang/Sema/DeclSpec.h" 34#include "clang/Sema/ParsedTemplate.h" 35#include "clang/Basic/PartialDiagnostic.h" 36#include "clang/Lex/Preprocessor.h" 37#include "llvm/ADT/SmallString.h" 38#include "llvm/ADT/STLExtras.h" 39#include <map> 40#include <set> 41 42using namespace clang; 43 44//===----------------------------------------------------------------------===// 45// CheckDefaultArgumentVisitor 46//===----------------------------------------------------------------------===// 47 48namespace { 49 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 50 /// the default argument of a parameter to determine whether it 51 /// contains any ill-formed subexpressions. For example, this will 52 /// diagnose the use of local variables or parameters within the 53 /// default argument expression. 54 class CheckDefaultArgumentVisitor 55 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 56 Expr *DefaultArg; 57 Sema *S; 58 59 public: 60 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 61 : DefaultArg(defarg), S(s) {} 62 63 bool VisitExpr(Expr *Node); 64 bool VisitDeclRefExpr(DeclRefExpr *DRE); 65 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 66 bool VisitLambdaExpr(LambdaExpr *Lambda); 67 }; 68 69 /// VisitExpr - Visit all of the children of this expression. 70 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 71 bool IsInvalid = false; 72 for (Stmt::child_range I = Node->children(); I; ++I) 73 IsInvalid |= Visit(*I); 74 return IsInvalid; 75 } 76 77 /// VisitDeclRefExpr - Visit a reference to a declaration, to 78 /// determine whether this declaration can be used in the default 79 /// argument expression. 80 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 81 NamedDecl *Decl = DRE->getDecl(); 82 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 83 // C++ [dcl.fct.default]p9 84 // Default arguments are evaluated each time the function is 85 // called. The order of evaluation of function arguments is 86 // unspecified. Consequently, parameters of a function shall not 87 // be used in default argument expressions, even if they are not 88 // evaluated. Parameters of a function declared before a default 89 // argument expression are in scope and can hide namespace and 90 // class member names. 91 return S->Diag(DRE->getLocStart(), 92 diag::err_param_default_argument_references_param) 93 << Param->getDeclName() << DefaultArg->getSourceRange(); 94 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 95 // C++ [dcl.fct.default]p7 96 // Local variables shall not be used in default argument 97 // expressions. 98 if (VDecl->isLocalVarDecl()) 99 return S->Diag(DRE->getLocStart(), 100 diag::err_param_default_argument_references_local) 101 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 102 } 103 104 return false; 105 } 106 107 /// VisitCXXThisExpr - Visit a C++ "this" expression. 108 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 109 // C++ [dcl.fct.default]p8: 110 // The keyword this shall not be used in a default argument of a 111 // member function. 112 return S->Diag(ThisE->getLocStart(), 113 diag::err_param_default_argument_references_this) 114 << ThisE->getSourceRange(); 115 } 116 117 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 118 // C++11 [expr.lambda.prim]p13: 119 // A lambda-expression appearing in a default argument shall not 120 // implicitly or explicitly capture any entity. 121 if (Lambda->capture_begin() == Lambda->capture_end()) 122 return false; 123 124 return S->Diag(Lambda->getLocStart(), 125 diag::err_lambda_capture_default_arg); 126 } 127} 128 129void Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, 130 CXXMethodDecl *Method) { 131 // If we have an MSAny spec already, don't bother. 132 if (!Method || ComputedEST == EST_MSAny) 133 return; 134 135 const FunctionProtoType *Proto 136 = Method->getType()->getAs<FunctionProtoType>(); 137 Proto = Self->ResolveExceptionSpec(CallLoc, Proto); 138 if (!Proto) 139 return; 140 141 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 142 143 // If this function can throw any exceptions, make a note of that. 144 if (EST == EST_MSAny || EST == EST_None) { 145 ClearExceptions(); 146 ComputedEST = EST; 147 return; 148 } 149 150 // FIXME: If the call to this decl is using any of its default arguments, we 151 // need to search them for potentially-throwing calls. 152 153 // If this function has a basic noexcept, it doesn't affect the outcome. 154 if (EST == EST_BasicNoexcept) 155 return; 156 157 // If we have a throw-all spec at this point, ignore the function. 158 if (ComputedEST == EST_None) 159 return; 160 161 // If we're still at noexcept(true) and there's a nothrow() callee, 162 // change to that specification. 163 if (EST == EST_DynamicNone) { 164 if (ComputedEST == EST_BasicNoexcept) 165 ComputedEST = EST_DynamicNone; 166 return; 167 } 168 169 // Check out noexcept specs. 170 if (EST == EST_ComputedNoexcept) { 171 FunctionProtoType::NoexceptResult NR = 172 Proto->getNoexceptSpec(Self->Context); 173 assert(NR != FunctionProtoType::NR_NoNoexcept && 174 "Must have noexcept result for EST_ComputedNoexcept."); 175 assert(NR != FunctionProtoType::NR_Dependent && 176 "Should not generate implicit declarations for dependent cases, " 177 "and don't know how to handle them anyway."); 178 179 // noexcept(false) -> no spec on the new function 180 if (NR == FunctionProtoType::NR_Throw) { 181 ClearExceptions(); 182 ComputedEST = EST_None; 183 } 184 // noexcept(true) won't change anything either. 185 return; 186 } 187 188 assert(EST == EST_Dynamic && "EST case not considered earlier."); 189 assert(ComputedEST != EST_None && 190 "Shouldn't collect exceptions when throw-all is guaranteed."); 191 ComputedEST = EST_Dynamic; 192 // Record the exceptions in this function's exception specification. 193 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 194 EEnd = Proto->exception_end(); 195 E != EEnd; ++E) 196 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E))) 197 Exceptions.push_back(*E); 198} 199 200void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 201 if (!E || ComputedEST == EST_MSAny) 202 return; 203 204 // FIXME: 205 // 206 // C++0x [except.spec]p14: 207 // [An] implicit exception-specification specifies the type-id T if and 208 // only if T is allowed by the exception-specification of a function directly 209 // invoked by f's implicit definition; f shall allow all exceptions if any 210 // function it directly invokes allows all exceptions, and f shall allow no 211 // exceptions if every function it directly invokes allows no exceptions. 212 // 213 // Note in particular that if an implicit exception-specification is generated 214 // for a function containing a throw-expression, that specification can still 215 // be noexcept(true). 216 // 217 // Note also that 'directly invoked' is not defined in the standard, and there 218 // is no indication that we should only consider potentially-evaluated calls. 219 // 220 // Ultimately we should implement the intent of the standard: the exception 221 // specification should be the set of exceptions which can be thrown by the 222 // implicit definition. For now, we assume that any non-nothrow expression can 223 // throw any exception. 224 225 if (Self->canThrow(E)) 226 ComputedEST = EST_None; 227} 228 229bool 230Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 231 SourceLocation EqualLoc) { 232 if (RequireCompleteType(Param->getLocation(), Param->getType(), 233 diag::err_typecheck_decl_incomplete_type)) { 234 Param->setInvalidDecl(); 235 return true; 236 } 237 238 // C++ [dcl.fct.default]p5 239 // A default argument expression is implicitly converted (clause 240 // 4) to the parameter type. The default argument expression has 241 // the same semantic constraints as the initializer expression in 242 // a declaration of a variable of the parameter type, using the 243 // copy-initialization semantics (8.5). 244 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 245 Param); 246 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 247 EqualLoc); 248 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 249 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg); 250 if (Result.isInvalid()) 251 return true; 252 Arg = Result.takeAs<Expr>(); 253 254 CheckImplicitConversions(Arg, EqualLoc); 255 Arg = MaybeCreateExprWithCleanups(Arg); 256 257 // Okay: add the default argument to the parameter 258 Param->setDefaultArg(Arg); 259 260 // We have already instantiated this parameter; provide each of the 261 // instantiations with the uninstantiated default argument. 262 UnparsedDefaultArgInstantiationsMap::iterator InstPos 263 = UnparsedDefaultArgInstantiations.find(Param); 264 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 265 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 266 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 267 268 // We're done tracking this parameter's instantiations. 269 UnparsedDefaultArgInstantiations.erase(InstPos); 270 } 271 272 return false; 273} 274 275/// ActOnParamDefaultArgument - Check whether the default argument 276/// provided for a function parameter is well-formed. If so, attach it 277/// to the parameter declaration. 278void 279Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 280 Expr *DefaultArg) { 281 if (!param || !DefaultArg) 282 return; 283 284 ParmVarDecl *Param = cast<ParmVarDecl>(param); 285 UnparsedDefaultArgLocs.erase(Param); 286 287 // Default arguments are only permitted in C++ 288 if (!getLangOpts().CPlusPlus) { 289 Diag(EqualLoc, diag::err_param_default_argument) 290 << DefaultArg->getSourceRange(); 291 Param->setInvalidDecl(); 292 return; 293 } 294 295 // Check for unexpanded parameter packs. 296 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 297 Param->setInvalidDecl(); 298 return; 299 } 300 301 // Check that the default argument is well-formed 302 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 303 if (DefaultArgChecker.Visit(DefaultArg)) { 304 Param->setInvalidDecl(); 305 return; 306 } 307 308 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 309} 310 311/// ActOnParamUnparsedDefaultArgument - We've seen a default 312/// argument for a function parameter, but we can't parse it yet 313/// because we're inside a class definition. Note that this default 314/// argument will be parsed later. 315void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 316 SourceLocation EqualLoc, 317 SourceLocation ArgLoc) { 318 if (!param) 319 return; 320 321 ParmVarDecl *Param = cast<ParmVarDecl>(param); 322 if (Param) 323 Param->setUnparsedDefaultArg(); 324 325 UnparsedDefaultArgLocs[Param] = ArgLoc; 326} 327 328/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 329/// the default argument for the parameter param failed. 330void Sema::ActOnParamDefaultArgumentError(Decl *param) { 331 if (!param) 332 return; 333 334 ParmVarDecl *Param = cast<ParmVarDecl>(param); 335 336 Param->setInvalidDecl(); 337 338 UnparsedDefaultArgLocs.erase(Param); 339} 340 341/// CheckExtraCXXDefaultArguments - Check for any extra default 342/// arguments in the declarator, which is not a function declaration 343/// or definition and therefore is not permitted to have default 344/// arguments. This routine should be invoked for every declarator 345/// that is not a function declaration or definition. 346void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 347 // C++ [dcl.fct.default]p3 348 // A default argument expression shall be specified only in the 349 // parameter-declaration-clause of a function declaration or in a 350 // template-parameter (14.1). It shall not be specified for a 351 // parameter pack. If it is specified in a 352 // parameter-declaration-clause, it shall not occur within a 353 // declarator or abstract-declarator of a parameter-declaration. 354 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 355 DeclaratorChunk &chunk = D.getTypeObject(i); 356 if (chunk.Kind == DeclaratorChunk::Function) { 357 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 358 ParmVarDecl *Param = 359 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 360 if (Param->hasUnparsedDefaultArg()) { 361 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 362 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 363 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 364 delete Toks; 365 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 366 } else if (Param->getDefaultArg()) { 367 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 368 << Param->getDefaultArg()->getSourceRange(); 369 Param->setDefaultArg(0); 370 } 371 } 372 } 373 } 374} 375 376/// MergeCXXFunctionDecl - Merge two declarations of the same C++ 377/// function, once we already know that they have the same 378/// type. Subroutine of MergeFunctionDecl. Returns true if there was an 379/// error, false otherwise. 380bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, 381 Scope *S) { 382 bool Invalid = false; 383 384 // C++ [dcl.fct.default]p4: 385 // For non-template functions, default arguments can be added in 386 // later declarations of a function in the same 387 // scope. Declarations in different scopes have completely 388 // distinct sets of default arguments. That is, declarations in 389 // inner scopes do not acquire default arguments from 390 // declarations in outer scopes, and vice versa. In a given 391 // function declaration, all parameters subsequent to a 392 // parameter with a default argument shall have default 393 // arguments supplied in this or previous declarations. A 394 // default argument shall not be redefined by a later 395 // declaration (not even to the same value). 396 // 397 // C++ [dcl.fct.default]p6: 398 // Except for member functions of class templates, the default arguments 399 // in a member function definition that appears outside of the class 400 // definition are added to the set of default arguments provided by the 401 // member function declaration in the class definition. 402 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 403 ParmVarDecl *OldParam = Old->getParamDecl(p); 404 ParmVarDecl *NewParam = New->getParamDecl(p); 405 406 bool OldParamHasDfl = OldParam->hasDefaultArg(); 407 bool NewParamHasDfl = NewParam->hasDefaultArg(); 408 409 NamedDecl *ND = Old; 410 if (S && !isDeclInScope(ND, New->getDeclContext(), S)) 411 // Ignore default parameters of old decl if they are not in 412 // the same scope. 413 OldParamHasDfl = false; 414 415 if (OldParamHasDfl && NewParamHasDfl) { 416 417 unsigned DiagDefaultParamID = 418 diag::err_param_default_argument_redefinition; 419 420 // MSVC accepts that default parameters be redefined for member functions 421 // of template class. The new default parameter's value is ignored. 422 Invalid = true; 423 if (getLangOpts().MicrosoftExt) { 424 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 425 if (MD && MD->getParent()->getDescribedClassTemplate()) { 426 // Merge the old default argument into the new parameter. 427 NewParam->setHasInheritedDefaultArg(); 428 if (OldParam->hasUninstantiatedDefaultArg()) 429 NewParam->setUninstantiatedDefaultArg( 430 OldParam->getUninstantiatedDefaultArg()); 431 else 432 NewParam->setDefaultArg(OldParam->getInit()); 433 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 434 Invalid = false; 435 } 436 } 437 438 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 439 // hint here. Alternatively, we could walk the type-source information 440 // for NewParam to find the last source location in the type... but it 441 // isn't worth the effort right now. This is the kind of test case that 442 // is hard to get right: 443 // int f(int); 444 // void g(int (*fp)(int) = f); 445 // void g(int (*fp)(int) = &f); 446 Diag(NewParam->getLocation(), DiagDefaultParamID) 447 << NewParam->getDefaultArgRange(); 448 449 // Look for the function declaration where the default argument was 450 // actually written, which may be a declaration prior to Old. 451 for (FunctionDecl *Older = Old->getPreviousDecl(); 452 Older; Older = Older->getPreviousDecl()) { 453 if (!Older->getParamDecl(p)->hasDefaultArg()) 454 break; 455 456 OldParam = Older->getParamDecl(p); 457 } 458 459 Diag(OldParam->getLocation(), diag::note_previous_definition) 460 << OldParam->getDefaultArgRange(); 461 } else if (OldParamHasDfl) { 462 // Merge the old default argument into the new parameter. 463 // It's important to use getInit() here; getDefaultArg() 464 // strips off any top-level ExprWithCleanups. 465 NewParam->setHasInheritedDefaultArg(); 466 if (OldParam->hasUninstantiatedDefaultArg()) 467 NewParam->setUninstantiatedDefaultArg( 468 OldParam->getUninstantiatedDefaultArg()); 469 else 470 NewParam->setDefaultArg(OldParam->getInit()); 471 } else if (NewParamHasDfl) { 472 if (New->getDescribedFunctionTemplate()) { 473 // Paragraph 4, quoted above, only applies to non-template functions. 474 Diag(NewParam->getLocation(), 475 diag::err_param_default_argument_template_redecl) 476 << NewParam->getDefaultArgRange(); 477 Diag(Old->getLocation(), diag::note_template_prev_declaration) 478 << false; 479 } else if (New->getTemplateSpecializationKind() 480 != TSK_ImplicitInstantiation && 481 New->getTemplateSpecializationKind() != TSK_Undeclared) { 482 // C++ [temp.expr.spec]p21: 483 // Default function arguments shall not be specified in a declaration 484 // or a definition for one of the following explicit specializations: 485 // - the explicit specialization of a function template; 486 // - the explicit specialization of a member function template; 487 // - the explicit specialization of a member function of a class 488 // template where the class template specialization to which the 489 // member function specialization belongs is implicitly 490 // instantiated. 491 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 492 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 493 << New->getDeclName() 494 << NewParam->getDefaultArgRange(); 495 } else if (New->getDeclContext()->isDependentContext()) { 496 // C++ [dcl.fct.default]p6 (DR217): 497 // Default arguments for a member function of a class template shall 498 // be specified on the initial declaration of the member function 499 // within the class template. 500 // 501 // Reading the tea leaves a bit in DR217 and its reference to DR205 502 // leads me to the conclusion that one cannot add default function 503 // arguments for an out-of-line definition of a member function of a 504 // dependent type. 505 int WhichKind = 2; 506 if (CXXRecordDecl *Record 507 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 508 if (Record->getDescribedClassTemplate()) 509 WhichKind = 0; 510 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 511 WhichKind = 1; 512 else 513 WhichKind = 2; 514 } 515 516 Diag(NewParam->getLocation(), 517 diag::err_param_default_argument_member_template_redecl) 518 << WhichKind 519 << NewParam->getDefaultArgRange(); 520 } 521 } 522 } 523 524 // DR1344: If a default argument is added outside a class definition and that 525 // default argument makes the function a special member function, the program 526 // is ill-formed. This can only happen for constructors. 527 if (isa<CXXConstructorDecl>(New) && 528 New->getMinRequiredArguments() < Old->getMinRequiredArguments()) { 529 CXXSpecialMember NewSM = getSpecialMember(cast<CXXMethodDecl>(New)), 530 OldSM = getSpecialMember(cast<CXXMethodDecl>(Old)); 531 if (NewSM != OldSM) { 532 ParmVarDecl *NewParam = New->getParamDecl(New->getMinRequiredArguments()); 533 assert(NewParam->hasDefaultArg()); 534 Diag(NewParam->getLocation(), diag::err_default_arg_makes_ctor_special) 535 << NewParam->getDefaultArgRange() << NewSM; 536 Diag(Old->getLocation(), diag::note_previous_declaration); 537 } 538 } 539 540 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 541 // template has a constexpr specifier then all its declarations shall 542 // contain the constexpr specifier. 543 if (New->isConstexpr() != Old->isConstexpr()) { 544 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 545 << New << New->isConstexpr(); 546 Diag(Old->getLocation(), diag::note_previous_declaration); 547 Invalid = true; 548 } 549 550 if (CheckEquivalentExceptionSpec(Old, New)) 551 Invalid = true; 552 553 return Invalid; 554} 555 556/// \brief Merge the exception specifications of two variable declarations. 557/// 558/// This is called when there's a redeclaration of a VarDecl. The function 559/// checks if the redeclaration might have an exception specification and 560/// validates compatibility and merges the specs if necessary. 561void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 562 // Shortcut if exceptions are disabled. 563 if (!getLangOpts().CXXExceptions) 564 return; 565 566 assert(Context.hasSameType(New->getType(), Old->getType()) && 567 "Should only be called if types are otherwise the same."); 568 569 QualType NewType = New->getType(); 570 QualType OldType = Old->getType(); 571 572 // We're only interested in pointers and references to functions, as well 573 // as pointers to member functions. 574 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 575 NewType = R->getPointeeType(); 576 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 577 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 578 NewType = P->getPointeeType(); 579 OldType = OldType->getAs<PointerType>()->getPointeeType(); 580 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 581 NewType = M->getPointeeType(); 582 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 583 } 584 585 if (!NewType->isFunctionProtoType()) 586 return; 587 588 // There's lots of special cases for functions. For function pointers, system 589 // libraries are hopefully not as broken so that we don't need these 590 // workarounds. 591 if (CheckEquivalentExceptionSpec( 592 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 593 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 594 New->setInvalidDecl(); 595 } 596} 597 598/// CheckCXXDefaultArguments - Verify that the default arguments for a 599/// function declaration are well-formed according to C++ 600/// [dcl.fct.default]. 601void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 602 unsigned NumParams = FD->getNumParams(); 603 unsigned p; 604 605 bool IsLambda = FD->getOverloadedOperator() == OO_Call && 606 isa<CXXMethodDecl>(FD) && 607 cast<CXXMethodDecl>(FD)->getParent()->isLambda(); 608 609 // Find first parameter with a default argument 610 for (p = 0; p < NumParams; ++p) { 611 ParmVarDecl *Param = FD->getParamDecl(p); 612 if (Param->hasDefaultArg()) { 613 // C++11 [expr.prim.lambda]p5: 614 // [...] Default arguments (8.3.6) shall not be specified in the 615 // parameter-declaration-clause of a lambda-declarator. 616 // 617 // FIXME: Core issue 974 strikes this sentence, we only provide an 618 // extension warning. 619 if (IsLambda) 620 Diag(Param->getLocation(), diag::ext_lambda_default_arguments) 621 << Param->getDefaultArgRange(); 622 break; 623 } 624 } 625 626 // C++ [dcl.fct.default]p4: 627 // In a given function declaration, all parameters 628 // subsequent to a parameter with a default argument shall 629 // have default arguments supplied in this or previous 630 // declarations. A default argument shall not be redefined 631 // by a later declaration (not even to the same value). 632 unsigned LastMissingDefaultArg = 0; 633 for (; p < NumParams; ++p) { 634 ParmVarDecl *Param = FD->getParamDecl(p); 635 if (!Param->hasDefaultArg()) { 636 if (Param->isInvalidDecl()) 637 /* We already complained about this parameter. */; 638 else if (Param->getIdentifier()) 639 Diag(Param->getLocation(), 640 diag::err_param_default_argument_missing_name) 641 << Param->getIdentifier(); 642 else 643 Diag(Param->getLocation(), 644 diag::err_param_default_argument_missing); 645 646 LastMissingDefaultArg = p; 647 } 648 } 649 650 if (LastMissingDefaultArg > 0) { 651 // Some default arguments were missing. Clear out all of the 652 // default arguments up to (and including) the last missing 653 // default argument, so that we leave the function parameters 654 // in a semantically valid state. 655 for (p = 0; p <= LastMissingDefaultArg; ++p) { 656 ParmVarDecl *Param = FD->getParamDecl(p); 657 if (Param->hasDefaultArg()) { 658 Param->setDefaultArg(0); 659 } 660 } 661 } 662} 663 664// CheckConstexprParameterTypes - Check whether a function's parameter types 665// are all literal types. If so, return true. If not, produce a suitable 666// diagnostic and return false. 667static bool CheckConstexprParameterTypes(Sema &SemaRef, 668 const FunctionDecl *FD) { 669 unsigned ArgIndex = 0; 670 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 671 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 672 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 673 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 674 SourceLocation ParamLoc = PD->getLocation(); 675 if (!(*i)->isDependentType() && 676 SemaRef.RequireLiteralType(ParamLoc, *i, 677 diag::err_constexpr_non_literal_param, 678 ArgIndex+1, PD->getSourceRange(), 679 isa<CXXConstructorDecl>(FD))) 680 return false; 681 } 682 return true; 683} 684 685/// \brief Get diagnostic %select index for tag kind for 686/// record diagnostic message. 687/// WARNING: Indexes apply to particular diagnostics only! 688/// 689/// \returns diagnostic %select index. 690static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) { 691 switch (Tag) { 692 case TTK_Struct: return 0; 693 case TTK_Interface: return 1; 694 case TTK_Class: return 2; 695 default: llvm_unreachable("Invalid tag kind for record diagnostic!"); 696 } 697} 698 699// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 700// the requirements of a constexpr function definition or a constexpr 701// constructor definition. If so, return true. If not, produce appropriate 702// diagnostics and return false. 703// 704// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 705bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 706 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 707 if (MD && MD->isInstance()) { 708 // C++11 [dcl.constexpr]p4: 709 // The definition of a constexpr constructor shall satisfy the following 710 // constraints: 711 // - the class shall not have any virtual base classes; 712 const CXXRecordDecl *RD = MD->getParent(); 713 if (RD->getNumVBases()) { 714 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 715 << isa<CXXConstructorDecl>(NewFD) 716 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 717 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 718 E = RD->vbases_end(); I != E; ++I) 719 Diag(I->getLocStart(), 720 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 721 return false; 722 } 723 } 724 725 if (!isa<CXXConstructorDecl>(NewFD)) { 726 // C++11 [dcl.constexpr]p3: 727 // The definition of a constexpr function shall satisfy the following 728 // constraints: 729 // - it shall not be virtual; 730 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 731 if (Method && Method->isVirtual()) { 732 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 733 734 // If it's not obvious why this function is virtual, find an overridden 735 // function which uses the 'virtual' keyword. 736 const CXXMethodDecl *WrittenVirtual = Method; 737 while (!WrittenVirtual->isVirtualAsWritten()) 738 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 739 if (WrittenVirtual != Method) 740 Diag(WrittenVirtual->getLocation(), 741 diag::note_overridden_virtual_function); 742 return false; 743 } 744 745 // - its return type shall be a literal type; 746 QualType RT = NewFD->getResultType(); 747 if (!RT->isDependentType() && 748 RequireLiteralType(NewFD->getLocation(), RT, 749 diag::err_constexpr_non_literal_return)) 750 return false; 751 } 752 753 // - each of its parameter types shall be a literal type; 754 if (!CheckConstexprParameterTypes(*this, NewFD)) 755 return false; 756 757 return true; 758} 759 760/// Check the given declaration statement is legal within a constexpr function 761/// body. C++0x [dcl.constexpr]p3,p4. 762/// 763/// \return true if the body is OK, false if we have diagnosed a problem. 764static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 765 DeclStmt *DS) { 766 // C++0x [dcl.constexpr]p3 and p4: 767 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 768 // contain only 769 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 770 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 771 switch ((*DclIt)->getKind()) { 772 case Decl::StaticAssert: 773 case Decl::Using: 774 case Decl::UsingShadow: 775 case Decl::UsingDirective: 776 case Decl::UnresolvedUsingTypename: 777 // - static_assert-declarations 778 // - using-declarations, 779 // - using-directives, 780 continue; 781 782 case Decl::Typedef: 783 case Decl::TypeAlias: { 784 // - typedef declarations and alias-declarations that do not define 785 // classes or enumerations, 786 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 787 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 788 // Don't allow variably-modified types in constexpr functions. 789 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 790 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 791 << TL.getSourceRange() << TL.getType() 792 << isa<CXXConstructorDecl>(Dcl); 793 return false; 794 } 795 continue; 796 } 797 798 case Decl::Enum: 799 case Decl::CXXRecord: 800 // As an extension, we allow the declaration (but not the definition) of 801 // classes and enumerations in all declarations, not just in typedef and 802 // alias declarations. 803 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 804 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 805 << isa<CXXConstructorDecl>(Dcl); 806 return false; 807 } 808 continue; 809 810 case Decl::Var: 811 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 812 << isa<CXXConstructorDecl>(Dcl); 813 return false; 814 815 default: 816 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 817 << isa<CXXConstructorDecl>(Dcl); 818 return false; 819 } 820 } 821 822 return true; 823} 824 825/// Check that the given field is initialized within a constexpr constructor. 826/// 827/// \param Dcl The constexpr constructor being checked. 828/// \param Field The field being checked. This may be a member of an anonymous 829/// struct or union nested within the class being checked. 830/// \param Inits All declarations, including anonymous struct/union members and 831/// indirect members, for which any initialization was provided. 832/// \param Diagnosed Set to true if an error is produced. 833static void CheckConstexprCtorInitializer(Sema &SemaRef, 834 const FunctionDecl *Dcl, 835 FieldDecl *Field, 836 llvm::SmallSet<Decl*, 16> &Inits, 837 bool &Diagnosed) { 838 if (Field->isUnnamedBitfield()) 839 return; 840 841 if (Field->isAnonymousStructOrUnion() && 842 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 843 return; 844 845 if (!Inits.count(Field)) { 846 if (!Diagnosed) { 847 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 848 Diagnosed = true; 849 } 850 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 851 } else if (Field->isAnonymousStructOrUnion()) { 852 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 853 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 854 I != E; ++I) 855 // If an anonymous union contains an anonymous struct of which any member 856 // is initialized, all members must be initialized. 857 if (!RD->isUnion() || Inits.count(*I)) 858 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 859 } 860} 861 862/// Check the body for the given constexpr function declaration only contains 863/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 864/// 865/// \return true if the body is OK, false if we have diagnosed a problem. 866bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 867 if (isa<CXXTryStmt>(Body)) { 868 // C++11 [dcl.constexpr]p3: 869 // The definition of a constexpr function shall satisfy the following 870 // constraints: [...] 871 // - its function-body shall be = delete, = default, or a 872 // compound-statement 873 // 874 // C++11 [dcl.constexpr]p4: 875 // In the definition of a constexpr constructor, [...] 876 // - its function-body shall not be a function-try-block; 877 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 878 << isa<CXXConstructorDecl>(Dcl); 879 return false; 880 } 881 882 // - its function-body shall be [...] a compound-statement that contains only 883 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 884 885 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 886 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 887 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 888 switch ((*BodyIt)->getStmtClass()) { 889 case Stmt::NullStmtClass: 890 // - null statements, 891 continue; 892 893 case Stmt::DeclStmtClass: 894 // - static_assert-declarations 895 // - using-declarations, 896 // - using-directives, 897 // - typedef declarations and alias-declarations that do not define 898 // classes or enumerations, 899 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 900 return false; 901 continue; 902 903 case Stmt::ReturnStmtClass: 904 // - and exactly one return statement; 905 if (isa<CXXConstructorDecl>(Dcl)) 906 break; 907 908 ReturnStmts.push_back((*BodyIt)->getLocStart()); 909 continue; 910 911 default: 912 break; 913 } 914 915 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 916 << isa<CXXConstructorDecl>(Dcl); 917 return false; 918 } 919 920 if (const CXXConstructorDecl *Constructor 921 = dyn_cast<CXXConstructorDecl>(Dcl)) { 922 const CXXRecordDecl *RD = Constructor->getParent(); 923 // DR1359: 924 // - every non-variant non-static data member and base class sub-object 925 // shall be initialized; 926 // - if the class is a non-empty union, or for each non-empty anonymous 927 // union member of a non-union class, exactly one non-static data member 928 // shall be initialized; 929 if (RD->isUnion()) { 930 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 931 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 932 return false; 933 } 934 } else if (!Constructor->isDependentContext() && 935 !Constructor->isDelegatingConstructor()) { 936 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 937 938 // Skip detailed checking if we have enough initializers, and we would 939 // allow at most one initializer per member. 940 bool AnyAnonStructUnionMembers = false; 941 unsigned Fields = 0; 942 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 943 E = RD->field_end(); I != E; ++I, ++Fields) { 944 if (I->isAnonymousStructOrUnion()) { 945 AnyAnonStructUnionMembers = true; 946 break; 947 } 948 } 949 if (AnyAnonStructUnionMembers || 950 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 951 // Check initialization of non-static data members. Base classes are 952 // always initialized so do not need to be checked. Dependent bases 953 // might not have initializers in the member initializer list. 954 llvm::SmallSet<Decl*, 16> Inits; 955 for (CXXConstructorDecl::init_const_iterator 956 I = Constructor->init_begin(), E = Constructor->init_end(); 957 I != E; ++I) { 958 if (FieldDecl *FD = (*I)->getMember()) 959 Inits.insert(FD); 960 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 961 Inits.insert(ID->chain_begin(), ID->chain_end()); 962 } 963 964 bool Diagnosed = false; 965 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 966 E = RD->field_end(); I != E; ++I) 967 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 968 if (Diagnosed) 969 return false; 970 } 971 } 972 } else { 973 if (ReturnStmts.empty()) { 974 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 975 return false; 976 } 977 if (ReturnStmts.size() > 1) { 978 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 979 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 980 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 981 return false; 982 } 983 } 984 985 // C++11 [dcl.constexpr]p5: 986 // if no function argument values exist such that the function invocation 987 // substitution would produce a constant expression, the program is 988 // ill-formed; no diagnostic required. 989 // C++11 [dcl.constexpr]p3: 990 // - every constructor call and implicit conversion used in initializing the 991 // return value shall be one of those allowed in a constant expression. 992 // C++11 [dcl.constexpr]p4: 993 // - every constructor involved in initializing non-static data members and 994 // base class sub-objects shall be a constexpr constructor. 995 llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 996 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 997 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr) 998 << isa<CXXConstructorDecl>(Dcl); 999 for (size_t I = 0, N = Diags.size(); I != N; ++I) 1000 Diag(Diags[I].first, Diags[I].second); 1001 return false; 1002 } 1003 1004 return true; 1005} 1006 1007/// isCurrentClassName - Determine whether the identifier II is the 1008/// name of the class type currently being defined. In the case of 1009/// nested classes, this will only return true if II is the name of 1010/// the innermost class. 1011bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 1012 const CXXScopeSpec *SS) { 1013 assert(getLangOpts().CPlusPlus && "No class names in C!"); 1014 1015 CXXRecordDecl *CurDecl; 1016 if (SS && SS->isSet() && !SS->isInvalid()) { 1017 DeclContext *DC = computeDeclContext(*SS, true); 1018 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 1019 } else 1020 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1021 1022 if (CurDecl && CurDecl->getIdentifier()) 1023 return &II == CurDecl->getIdentifier(); 1024 else 1025 return false; 1026} 1027 1028/// \brief Determine whether the given class is a base class of the given 1029/// class, including looking at dependent bases. 1030static bool findCircularInheritance(const CXXRecordDecl *Class, 1031 const CXXRecordDecl *Current) { 1032 SmallVector<const CXXRecordDecl*, 8> Queue; 1033 1034 Class = Class->getCanonicalDecl(); 1035 while (true) { 1036 for (CXXRecordDecl::base_class_const_iterator I = Current->bases_begin(), 1037 E = Current->bases_end(); 1038 I != E; ++I) { 1039 CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); 1040 if (!Base) 1041 continue; 1042 1043 Base = Base->getDefinition(); 1044 if (!Base) 1045 continue; 1046 1047 if (Base->getCanonicalDecl() == Class) 1048 return true; 1049 1050 Queue.push_back(Base); 1051 } 1052 1053 if (Queue.empty()) 1054 return false; 1055 1056 Current = Queue.back(); 1057 Queue.pop_back(); 1058 } 1059 1060 return false; 1061} 1062 1063/// \brief Check the validity of a C++ base class specifier. 1064/// 1065/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1066/// and returns NULL otherwise. 1067CXXBaseSpecifier * 1068Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1069 SourceRange SpecifierRange, 1070 bool Virtual, AccessSpecifier Access, 1071 TypeSourceInfo *TInfo, 1072 SourceLocation EllipsisLoc) { 1073 QualType BaseType = TInfo->getType(); 1074 1075 // C++ [class.union]p1: 1076 // A union shall not have base classes. 1077 if (Class->isUnion()) { 1078 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1079 << SpecifierRange; 1080 return 0; 1081 } 1082 1083 if (EllipsisLoc.isValid() && 1084 !TInfo->getType()->containsUnexpandedParameterPack()) { 1085 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1086 << TInfo->getTypeLoc().getSourceRange(); 1087 EllipsisLoc = SourceLocation(); 1088 } 1089 1090 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1091 1092 if (BaseType->isDependentType()) { 1093 // Make sure that we don't have circular inheritance among our dependent 1094 // bases. For non-dependent bases, the check for completeness below handles 1095 // this. 1096 if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) { 1097 if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() || 1098 ((BaseDecl = BaseDecl->getDefinition()) && 1099 findCircularInheritance(Class, BaseDecl))) { 1100 Diag(BaseLoc, diag::err_circular_inheritance) 1101 << BaseType << Context.getTypeDeclType(Class); 1102 1103 if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl()) 1104 Diag(BaseDecl->getLocation(), diag::note_previous_decl) 1105 << BaseType; 1106 1107 return 0; 1108 } 1109 } 1110 1111 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1112 Class->getTagKind() == TTK_Class, 1113 Access, TInfo, EllipsisLoc); 1114 } 1115 1116 // Base specifiers must be record types. 1117 if (!BaseType->isRecordType()) { 1118 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1119 return 0; 1120 } 1121 1122 // C++ [class.union]p1: 1123 // A union shall not be used as a base class. 1124 if (BaseType->isUnionType()) { 1125 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1126 return 0; 1127 } 1128 1129 // C++ [class.derived]p2: 1130 // The class-name in a base-specifier shall not be an incompletely 1131 // defined class. 1132 if (RequireCompleteType(BaseLoc, BaseType, 1133 diag::err_incomplete_base_class, SpecifierRange)) { 1134 Class->setInvalidDecl(); 1135 return 0; 1136 } 1137 1138 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1139 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1140 assert(BaseDecl && "Record type has no declaration"); 1141 BaseDecl = BaseDecl->getDefinition(); 1142 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1143 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1144 assert(CXXBaseDecl && "Base type is not a C++ type"); 1145 1146 // C++ [class]p3: 1147 // If a class is marked final and it appears as a base-type-specifier in 1148 // base-clause, the program is ill-formed. 1149 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1150 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1151 << CXXBaseDecl->getDeclName(); 1152 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1153 << CXXBaseDecl->getDeclName(); 1154 return 0; 1155 } 1156 1157 if (BaseDecl->isInvalidDecl()) 1158 Class->setInvalidDecl(); 1159 1160 // Create the base specifier. 1161 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1162 Class->getTagKind() == TTK_Class, 1163 Access, TInfo, EllipsisLoc); 1164} 1165 1166/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1167/// one entry in the base class list of a class specifier, for 1168/// example: 1169/// class foo : public bar, virtual private baz { 1170/// 'public bar' and 'virtual private baz' are each base-specifiers. 1171BaseResult 1172Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1173 bool Virtual, AccessSpecifier Access, 1174 ParsedType basetype, SourceLocation BaseLoc, 1175 SourceLocation EllipsisLoc) { 1176 if (!classdecl) 1177 return true; 1178 1179 AdjustDeclIfTemplate(classdecl); 1180 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1181 if (!Class) 1182 return true; 1183 1184 TypeSourceInfo *TInfo = 0; 1185 GetTypeFromParser(basetype, &TInfo); 1186 1187 if (EllipsisLoc.isInvalid() && 1188 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1189 UPPC_BaseType)) 1190 return true; 1191 1192 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1193 Virtual, Access, TInfo, 1194 EllipsisLoc)) 1195 return BaseSpec; 1196 else 1197 Class->setInvalidDecl(); 1198 1199 return true; 1200} 1201 1202/// \brief Performs the actual work of attaching the given base class 1203/// specifiers to a C++ class. 1204bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1205 unsigned NumBases) { 1206 if (NumBases == 0) 1207 return false; 1208 1209 // Used to keep track of which base types we have already seen, so 1210 // that we can properly diagnose redundant direct base types. Note 1211 // that the key is always the unqualified canonical type of the base 1212 // class. 1213 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1214 1215 // Copy non-redundant base specifiers into permanent storage. 1216 unsigned NumGoodBases = 0; 1217 bool Invalid = false; 1218 for (unsigned idx = 0; idx < NumBases; ++idx) { 1219 QualType NewBaseType 1220 = Context.getCanonicalType(Bases[idx]->getType()); 1221 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1222 1223 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1224 if (KnownBase) { 1225 // C++ [class.mi]p3: 1226 // A class shall not be specified as a direct base class of a 1227 // derived class more than once. 1228 Diag(Bases[idx]->getLocStart(), 1229 diag::err_duplicate_base_class) 1230 << KnownBase->getType() 1231 << Bases[idx]->getSourceRange(); 1232 1233 // Delete the duplicate base class specifier; we're going to 1234 // overwrite its pointer later. 1235 Context.Deallocate(Bases[idx]); 1236 1237 Invalid = true; 1238 } else { 1239 // Okay, add this new base class. 1240 KnownBase = Bases[idx]; 1241 Bases[NumGoodBases++] = Bases[idx]; 1242 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) { 1243 const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); 1244 if (Class->isInterface() && 1245 (!RD->isInterface() || 1246 KnownBase->getAccessSpecifier() != AS_public)) { 1247 // The Microsoft extension __interface does not permit bases that 1248 // are not themselves public interfaces. 1249 Diag(KnownBase->getLocStart(), diag::err_invalid_base_in_interface) 1250 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getName() 1251 << RD->getSourceRange(); 1252 Invalid = true; 1253 } 1254 if (RD->hasAttr<WeakAttr>()) 1255 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1256 } 1257 } 1258 } 1259 1260 // Attach the remaining base class specifiers to the derived class. 1261 Class->setBases(Bases, NumGoodBases); 1262 1263 // Delete the remaining (good) base class specifiers, since their 1264 // data has been copied into the CXXRecordDecl. 1265 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1266 Context.Deallocate(Bases[idx]); 1267 1268 return Invalid; 1269} 1270 1271/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1272/// class, after checking whether there are any duplicate base 1273/// classes. 1274void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1275 unsigned NumBases) { 1276 if (!ClassDecl || !Bases || !NumBases) 1277 return; 1278 1279 AdjustDeclIfTemplate(ClassDecl); 1280 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1281 (CXXBaseSpecifier**)(Bases), NumBases); 1282} 1283 1284static CXXRecordDecl *GetClassForType(QualType T) { 1285 if (const RecordType *RT = T->getAs<RecordType>()) 1286 return cast<CXXRecordDecl>(RT->getDecl()); 1287 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1288 return ICT->getDecl(); 1289 else 1290 return 0; 1291} 1292 1293/// \brief Determine whether the type \p Derived is a C++ class that is 1294/// derived from the type \p Base. 1295bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1296 if (!getLangOpts().CPlusPlus) 1297 return false; 1298 1299 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1300 if (!DerivedRD) 1301 return false; 1302 1303 CXXRecordDecl *BaseRD = GetClassForType(Base); 1304 if (!BaseRD) 1305 return false; 1306 1307 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1308 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1309} 1310 1311/// \brief Determine whether the type \p Derived is a C++ class that is 1312/// derived from the type \p Base. 1313bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1314 if (!getLangOpts().CPlusPlus) 1315 return false; 1316 1317 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1318 if (!DerivedRD) 1319 return false; 1320 1321 CXXRecordDecl *BaseRD = GetClassForType(Base); 1322 if (!BaseRD) 1323 return false; 1324 1325 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1326} 1327 1328void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1329 CXXCastPath &BasePathArray) { 1330 assert(BasePathArray.empty() && "Base path array must be empty!"); 1331 assert(Paths.isRecordingPaths() && "Must record paths!"); 1332 1333 const CXXBasePath &Path = Paths.front(); 1334 1335 // We first go backward and check if we have a virtual base. 1336 // FIXME: It would be better if CXXBasePath had the base specifier for 1337 // the nearest virtual base. 1338 unsigned Start = 0; 1339 for (unsigned I = Path.size(); I != 0; --I) { 1340 if (Path[I - 1].Base->isVirtual()) { 1341 Start = I - 1; 1342 break; 1343 } 1344 } 1345 1346 // Now add all bases. 1347 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1348 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1349} 1350 1351/// \brief Determine whether the given base path includes a virtual 1352/// base class. 1353bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1354 for (CXXCastPath::const_iterator B = BasePath.begin(), 1355 BEnd = BasePath.end(); 1356 B != BEnd; ++B) 1357 if ((*B)->isVirtual()) 1358 return true; 1359 1360 return false; 1361} 1362 1363/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1364/// conversion (where Derived and Base are class types) is 1365/// well-formed, meaning that the conversion is unambiguous (and 1366/// that all of the base classes are accessible). Returns true 1367/// and emits a diagnostic if the code is ill-formed, returns false 1368/// otherwise. Loc is the location where this routine should point to 1369/// if there is an error, and Range is the source range to highlight 1370/// if there is an error. 1371bool 1372Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1373 unsigned InaccessibleBaseID, 1374 unsigned AmbigiousBaseConvID, 1375 SourceLocation Loc, SourceRange Range, 1376 DeclarationName Name, 1377 CXXCastPath *BasePath) { 1378 // First, determine whether the path from Derived to Base is 1379 // ambiguous. This is slightly more expensive than checking whether 1380 // the Derived to Base conversion exists, because here we need to 1381 // explore multiple paths to determine if there is an ambiguity. 1382 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1383 /*DetectVirtual=*/false); 1384 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1385 assert(DerivationOkay && 1386 "Can only be used with a derived-to-base conversion"); 1387 (void)DerivationOkay; 1388 1389 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1390 if (InaccessibleBaseID) { 1391 // Check that the base class can be accessed. 1392 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1393 InaccessibleBaseID)) { 1394 case AR_inaccessible: 1395 return true; 1396 case AR_accessible: 1397 case AR_dependent: 1398 case AR_delayed: 1399 break; 1400 } 1401 } 1402 1403 // Build a base path if necessary. 1404 if (BasePath) 1405 BuildBasePathArray(Paths, *BasePath); 1406 return false; 1407 } 1408 1409 // We know that the derived-to-base conversion is ambiguous, and 1410 // we're going to produce a diagnostic. Perform the derived-to-base 1411 // search just one more time to compute all of the possible paths so 1412 // that we can print them out. This is more expensive than any of 1413 // the previous derived-to-base checks we've done, but at this point 1414 // performance isn't as much of an issue. 1415 Paths.clear(); 1416 Paths.setRecordingPaths(true); 1417 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1418 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1419 (void)StillOkay; 1420 1421 // Build up a textual representation of the ambiguous paths, e.g., 1422 // D -> B -> A, that will be used to illustrate the ambiguous 1423 // conversions in the diagnostic. We only print one of the paths 1424 // to each base class subobject. 1425 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1426 1427 Diag(Loc, AmbigiousBaseConvID) 1428 << Derived << Base << PathDisplayStr << Range << Name; 1429 return true; 1430} 1431 1432bool 1433Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1434 SourceLocation Loc, SourceRange Range, 1435 CXXCastPath *BasePath, 1436 bool IgnoreAccess) { 1437 return CheckDerivedToBaseConversion(Derived, Base, 1438 IgnoreAccess ? 0 1439 : diag::err_upcast_to_inaccessible_base, 1440 diag::err_ambiguous_derived_to_base_conv, 1441 Loc, Range, DeclarationName(), 1442 BasePath); 1443} 1444 1445 1446/// @brief Builds a string representing ambiguous paths from a 1447/// specific derived class to different subobjects of the same base 1448/// class. 1449/// 1450/// This function builds a string that can be used in error messages 1451/// to show the different paths that one can take through the 1452/// inheritance hierarchy to go from the derived class to different 1453/// subobjects of a base class. The result looks something like this: 1454/// @code 1455/// struct D -> struct B -> struct A 1456/// struct D -> struct C -> struct A 1457/// @endcode 1458std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1459 std::string PathDisplayStr; 1460 std::set<unsigned> DisplayedPaths; 1461 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1462 Path != Paths.end(); ++Path) { 1463 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1464 // We haven't displayed a path to this particular base 1465 // class subobject yet. 1466 PathDisplayStr += "\n "; 1467 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1468 for (CXXBasePath::const_iterator Element = Path->begin(); 1469 Element != Path->end(); ++Element) 1470 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1471 } 1472 } 1473 1474 return PathDisplayStr; 1475} 1476 1477//===----------------------------------------------------------------------===// 1478// C++ class member Handling 1479//===----------------------------------------------------------------------===// 1480 1481/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1482bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1483 SourceLocation ASLoc, 1484 SourceLocation ColonLoc, 1485 AttributeList *Attrs) { 1486 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1487 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1488 ASLoc, ColonLoc); 1489 CurContext->addHiddenDecl(ASDecl); 1490 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1491} 1492 1493/// CheckOverrideControl - Check C++11 override control semantics. 1494void Sema::CheckOverrideControl(Decl *D) { 1495 if (D->isInvalidDecl()) 1496 return; 1497 1498 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1499 1500 // Do we know which functions this declaration might be overriding? 1501 bool OverridesAreKnown = !MD || 1502 (!MD->getParent()->hasAnyDependentBases() && 1503 !MD->getType()->isDependentType()); 1504 1505 if (!MD || !MD->isVirtual()) { 1506 if (OverridesAreKnown) { 1507 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1508 Diag(OA->getLocation(), 1509 diag::override_keyword_only_allowed_on_virtual_member_functions) 1510 << "override" << FixItHint::CreateRemoval(OA->getLocation()); 1511 D->dropAttr<OverrideAttr>(); 1512 } 1513 if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1514 Diag(FA->getLocation(), 1515 diag::override_keyword_only_allowed_on_virtual_member_functions) 1516 << "final" << FixItHint::CreateRemoval(FA->getLocation()); 1517 D->dropAttr<FinalAttr>(); 1518 } 1519 } 1520 return; 1521 } 1522 1523 if (!OverridesAreKnown) 1524 return; 1525 1526 // C++11 [class.virtual]p5: 1527 // If a virtual function is marked with the virt-specifier override and 1528 // does not override a member function of a base class, the program is 1529 // ill-formed. 1530 bool HasOverriddenMethods = 1531 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1532 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) 1533 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) 1534 << MD->getDeclName(); 1535} 1536 1537/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1538/// function overrides a virtual member function marked 'final', according to 1539/// C++11 [class.virtual]p4. 1540bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1541 const CXXMethodDecl *Old) { 1542 if (!Old->hasAttr<FinalAttr>()) 1543 return false; 1544 1545 Diag(New->getLocation(), diag::err_final_function_overridden) 1546 << New->getDeclName(); 1547 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1548 return true; 1549} 1550 1551static bool InitializationHasSideEffects(const FieldDecl &FD) { 1552 const Type *T = FD.getType()->getBaseElementTypeUnsafe(); 1553 // FIXME: Destruction of ObjC lifetime types has side-effects. 1554 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) 1555 return !RD->isCompleteDefinition() || 1556 !RD->hasTrivialDefaultConstructor() || 1557 !RD->hasTrivialDestructor(); 1558 return false; 1559} 1560 1561/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1562/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1563/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1564/// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1565/// present (but parsing it has been deferred). 1566Decl * 1567Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1568 MultiTemplateParamsArg TemplateParameterLists, 1569 Expr *BW, const VirtSpecifiers &VS, 1570 InClassInitStyle InitStyle) { 1571 const DeclSpec &DS = D.getDeclSpec(); 1572 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1573 DeclarationName Name = NameInfo.getName(); 1574 SourceLocation Loc = NameInfo.getLoc(); 1575 1576 // For anonymous bitfields, the location should point to the type. 1577 if (Loc.isInvalid()) 1578 Loc = D.getLocStart(); 1579 1580 Expr *BitWidth = static_cast<Expr*>(BW); 1581 1582 assert(isa<CXXRecordDecl>(CurContext)); 1583 assert(!DS.isFriendSpecified()); 1584 1585 bool isFunc = D.isDeclarationOfFunction(); 1586 1587 if (cast<CXXRecordDecl>(CurContext)->isInterface()) { 1588 // The Microsoft extension __interface only permits public member functions 1589 // and prohibits constructors, destructors, operators, non-public member 1590 // functions, static methods and data members. 1591 unsigned InvalidDecl; 1592 bool ShowDeclName = true; 1593 if (!isFunc) 1594 InvalidDecl = (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) ? 0 : 1; 1595 else if (AS != AS_public) 1596 InvalidDecl = 2; 1597 else if (DS.getStorageClassSpec() == DeclSpec::SCS_static) 1598 InvalidDecl = 3; 1599 else switch (Name.getNameKind()) { 1600 case DeclarationName::CXXConstructorName: 1601 InvalidDecl = 4; 1602 ShowDeclName = false; 1603 break; 1604 1605 case DeclarationName::CXXDestructorName: 1606 InvalidDecl = 5; 1607 ShowDeclName = false; 1608 break; 1609 1610 case DeclarationName::CXXOperatorName: 1611 case DeclarationName::CXXConversionFunctionName: 1612 InvalidDecl = 6; 1613 break; 1614 1615 default: 1616 InvalidDecl = 0; 1617 break; 1618 } 1619 1620 if (InvalidDecl) { 1621 if (ShowDeclName) 1622 Diag(Loc, diag::err_invalid_member_in_interface) 1623 << (InvalidDecl-1) << Name; 1624 else 1625 Diag(Loc, diag::err_invalid_member_in_interface) 1626 << (InvalidDecl-1) << ""; 1627 return 0; 1628 } 1629 } 1630 1631 // C++ 9.2p6: A member shall not be declared to have automatic storage 1632 // duration (auto, register) or with the extern storage-class-specifier. 1633 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1634 // data members and cannot be applied to names declared const or static, 1635 // and cannot be applied to reference members. 1636 switch (DS.getStorageClassSpec()) { 1637 case DeclSpec::SCS_unspecified: 1638 case DeclSpec::SCS_typedef: 1639 case DeclSpec::SCS_static: 1640 // FALL THROUGH. 1641 break; 1642 case DeclSpec::SCS_mutable: 1643 if (isFunc) { 1644 if (DS.getStorageClassSpecLoc().isValid()) 1645 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1646 else 1647 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1648 1649 // FIXME: It would be nicer if the keyword was ignored only for this 1650 // declarator. Otherwise we could get follow-up errors. 1651 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1652 } 1653 break; 1654 default: 1655 if (DS.getStorageClassSpecLoc().isValid()) 1656 Diag(DS.getStorageClassSpecLoc(), 1657 diag::err_storageclass_invalid_for_member); 1658 else 1659 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1660 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1661 } 1662 1663 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1664 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1665 !isFunc); 1666 1667 Decl *Member; 1668 if (isInstField) { 1669 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1670 1671 // Data members must have identifiers for names. 1672 if (!Name.isIdentifier()) { 1673 Diag(Loc, diag::err_bad_variable_name) 1674 << Name; 1675 return 0; 1676 } 1677 1678 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1679 1680 // Member field could not be with "template" keyword. 1681 // So TemplateParameterLists should be empty in this case. 1682 if (TemplateParameterLists.size()) { 1683 TemplateParameterList* TemplateParams = TemplateParameterLists[0]; 1684 if (TemplateParams->size()) { 1685 // There is no such thing as a member field template. 1686 Diag(D.getIdentifierLoc(), diag::err_template_member) 1687 << II 1688 << SourceRange(TemplateParams->getTemplateLoc(), 1689 TemplateParams->getRAngleLoc()); 1690 } else { 1691 // There is an extraneous 'template<>' for this member. 1692 Diag(TemplateParams->getTemplateLoc(), 1693 diag::err_template_member_noparams) 1694 << II 1695 << SourceRange(TemplateParams->getTemplateLoc(), 1696 TemplateParams->getRAngleLoc()); 1697 } 1698 return 0; 1699 } 1700 1701 if (SS.isSet() && !SS.isInvalid()) { 1702 // The user provided a superfluous scope specifier inside a class 1703 // definition: 1704 // 1705 // class X { 1706 // int X::member; 1707 // }; 1708 if (DeclContext *DC = computeDeclContext(SS, false)) 1709 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1710 else 1711 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1712 << Name << SS.getRange(); 1713 1714 SS.clear(); 1715 } 1716 1717 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1718 InitStyle, AS); 1719 assert(Member && "HandleField never returns null"); 1720 } else { 1721 assert(InitStyle == ICIS_NoInit); 1722 1723 Member = HandleDeclarator(S, D, TemplateParameterLists); 1724 if (!Member) { 1725 return 0; 1726 } 1727 1728 // Non-instance-fields can't have a bitfield. 1729 if (BitWidth) { 1730 if (Member->isInvalidDecl()) { 1731 // don't emit another diagnostic. 1732 } else if (isa<VarDecl>(Member)) { 1733 // C++ 9.6p3: A bit-field shall not be a static member. 1734 // "static member 'A' cannot be a bit-field" 1735 Diag(Loc, diag::err_static_not_bitfield) 1736 << Name << BitWidth->getSourceRange(); 1737 } else if (isa<TypedefDecl>(Member)) { 1738 // "typedef member 'x' cannot be a bit-field" 1739 Diag(Loc, diag::err_typedef_not_bitfield) 1740 << Name << BitWidth->getSourceRange(); 1741 } else { 1742 // A function typedef ("typedef int f(); f a;"). 1743 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1744 Diag(Loc, diag::err_not_integral_type_bitfield) 1745 << Name << cast<ValueDecl>(Member)->getType() 1746 << BitWidth->getSourceRange(); 1747 } 1748 1749 BitWidth = 0; 1750 Member->setInvalidDecl(); 1751 } 1752 1753 Member->setAccess(AS); 1754 1755 // If we have declared a member function template, set the access of the 1756 // templated declaration as well. 1757 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1758 FunTmpl->getTemplatedDecl()->setAccess(AS); 1759 } 1760 1761 if (VS.isOverrideSpecified()) 1762 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1763 if (VS.isFinalSpecified()) 1764 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1765 1766 if (VS.getLastLocation().isValid()) { 1767 // Update the end location of a method that has a virt-specifiers. 1768 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1769 MD->setRangeEnd(VS.getLastLocation()); 1770 } 1771 1772 CheckOverrideControl(Member); 1773 1774 assert((Name || isInstField) && "No identifier for non-field ?"); 1775 1776 if (isInstField) { 1777 FieldDecl *FD = cast<FieldDecl>(Member); 1778 FieldCollector->Add(FD); 1779 1780 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 1781 FD->getLocation()) 1782 != DiagnosticsEngine::Ignored) { 1783 // Remember all explicit private FieldDecls that have a name, no side 1784 // effects and are not part of a dependent type declaration. 1785 if (!FD->isImplicit() && FD->getDeclName() && 1786 FD->getAccess() == AS_private && 1787 !FD->hasAttr<UnusedAttr>() && 1788 !FD->getParent()->isDependentContext() && 1789 !InitializationHasSideEffects(*FD)) 1790 UnusedPrivateFields.insert(FD); 1791 } 1792 } 1793 1794 return Member; 1795} 1796 1797namespace { 1798 class UninitializedFieldVisitor 1799 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 1800 Sema &S; 1801 ValueDecl *VD; 1802 public: 1803 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 1804 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context), 1805 S(S) { 1806 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(VD)) 1807 this->VD = IFD->getAnonField(); 1808 else 1809 this->VD = VD; 1810 } 1811 1812 void HandleExpr(Expr *E) { 1813 if (!E) return; 1814 1815 // Expressions like x(x) sometimes lack the surrounding expressions 1816 // but need to be checked anyways. 1817 HandleValue(E); 1818 Visit(E); 1819 } 1820 1821 void HandleValue(Expr *E) { 1822 E = E->IgnoreParens(); 1823 1824 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 1825 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 1826 return; 1827 1828 // FieldME is the inner-most MemberExpr that is not an anonymous struct 1829 // or union. 1830 MemberExpr *FieldME = ME; 1831 1832 Expr *Base = E; 1833 while (isa<MemberExpr>(Base)) { 1834 ME = cast<MemberExpr>(Base); 1835 1836 if (isa<VarDecl>(ME->getMemberDecl())) 1837 return; 1838 1839 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 1840 if (!FD->isAnonymousStructOrUnion()) 1841 FieldME = ME; 1842 1843 Base = ME->getBase(); 1844 } 1845 1846 if (VD == FieldME->getMemberDecl() && isa<CXXThisExpr>(Base)) { 1847 unsigned diag = VD->getType()->isReferenceType() 1848 ? diag::warn_reference_field_is_uninit 1849 : diag::warn_field_is_uninit; 1850 S.Diag(FieldME->getExprLoc(), diag) << VD; 1851 } 1852 return; 1853 } 1854 1855 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 1856 HandleValue(CO->getTrueExpr()); 1857 HandleValue(CO->getFalseExpr()); 1858 return; 1859 } 1860 1861 if (BinaryConditionalOperator *BCO = 1862 dyn_cast<BinaryConditionalOperator>(E)) { 1863 HandleValue(BCO->getCommon()); 1864 HandleValue(BCO->getFalseExpr()); 1865 return; 1866 } 1867 1868 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 1869 switch (BO->getOpcode()) { 1870 default: 1871 return; 1872 case(BO_PtrMemD): 1873 case(BO_PtrMemI): 1874 HandleValue(BO->getLHS()); 1875 return; 1876 case(BO_Comma): 1877 HandleValue(BO->getRHS()); 1878 return; 1879 } 1880 } 1881 } 1882 1883 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 1884 if (E->getCastKind() == CK_LValueToRValue) 1885 HandleValue(E->getSubExpr()); 1886 1887 Inherited::VisitImplicitCastExpr(E); 1888 } 1889 1890 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 1891 Expr *Callee = E->getCallee(); 1892 if (isa<MemberExpr>(Callee)) 1893 HandleValue(Callee); 1894 1895 Inherited::VisitCXXMemberCallExpr(E); 1896 } 1897 }; 1898 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E, 1899 ValueDecl *VD) { 1900 UninitializedFieldVisitor(S, VD).HandleExpr(E); 1901 } 1902} // namespace 1903 1904/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1905/// in-class initializer for a non-static C++ class member, and after 1906/// instantiating an in-class initializer in a class template. Such actions 1907/// are deferred until the class is complete. 1908void 1909Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 1910 Expr *InitExpr) { 1911 FieldDecl *FD = cast<FieldDecl>(D); 1912 assert(FD->getInClassInitStyle() != ICIS_NoInit && 1913 "must set init style when field is created"); 1914 1915 if (!InitExpr) { 1916 FD->setInvalidDecl(); 1917 FD->removeInClassInitializer(); 1918 return; 1919 } 1920 1921 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1922 FD->setInvalidDecl(); 1923 FD->removeInClassInitializer(); 1924 return; 1925 } 1926 1927 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, InitLoc) 1928 != DiagnosticsEngine::Ignored) { 1929 CheckInitExprContainsUninitializedFields(*this, InitExpr, FD); 1930 } 1931 1932 ExprResult Init = InitExpr; 1933 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent() && 1934 !FD->getDeclContext()->isDependentContext()) { 1935 // Note: We don't type-check when we're in a dependent context, because 1936 // the initialization-substitution code does not properly handle direct 1937 // list initialization. We have the same hackaround for ctor-initializers. 1938 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1939 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1940 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1941 } 1942 Expr **Inits = &InitExpr; 1943 unsigned NumInits = 1; 1944 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1945 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 1946 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1947 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 1948 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 1949 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 1950 if (Init.isInvalid()) { 1951 FD->setInvalidDecl(); 1952 return; 1953 } 1954 1955 CheckImplicitConversions(Init.get(), InitLoc); 1956 } 1957 1958 // C++0x [class.base.init]p7: 1959 // The initialization of each base and member constitutes a 1960 // full-expression. 1961 Init = MaybeCreateExprWithCleanups(Init); 1962 if (Init.isInvalid()) { 1963 FD->setInvalidDecl(); 1964 return; 1965 } 1966 1967 InitExpr = Init.release(); 1968 1969 FD->setInClassInitializer(InitExpr); 1970} 1971 1972/// \brief Find the direct and/or virtual base specifiers that 1973/// correspond to the given base type, for use in base initialization 1974/// within a constructor. 1975static bool FindBaseInitializer(Sema &SemaRef, 1976 CXXRecordDecl *ClassDecl, 1977 QualType BaseType, 1978 const CXXBaseSpecifier *&DirectBaseSpec, 1979 const CXXBaseSpecifier *&VirtualBaseSpec) { 1980 // First, check for a direct base class. 1981 DirectBaseSpec = 0; 1982 for (CXXRecordDecl::base_class_const_iterator Base 1983 = ClassDecl->bases_begin(); 1984 Base != ClassDecl->bases_end(); ++Base) { 1985 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1986 // We found a direct base of this type. That's what we're 1987 // initializing. 1988 DirectBaseSpec = &*Base; 1989 break; 1990 } 1991 } 1992 1993 // Check for a virtual base class. 1994 // FIXME: We might be able to short-circuit this if we know in advance that 1995 // there are no virtual bases. 1996 VirtualBaseSpec = 0; 1997 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1998 // We haven't found a base yet; search the class hierarchy for a 1999 // virtual base class. 2000 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 2001 /*DetectVirtual=*/false); 2002 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 2003 BaseType, Paths)) { 2004 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 2005 Path != Paths.end(); ++Path) { 2006 if (Path->back().Base->isVirtual()) { 2007 VirtualBaseSpec = Path->back().Base; 2008 break; 2009 } 2010 } 2011 } 2012 } 2013 2014 return DirectBaseSpec || VirtualBaseSpec; 2015} 2016 2017/// \brief Handle a C++ member initializer using braced-init-list syntax. 2018MemInitResult 2019Sema::ActOnMemInitializer(Decl *ConstructorD, 2020 Scope *S, 2021 CXXScopeSpec &SS, 2022 IdentifierInfo *MemberOrBase, 2023 ParsedType TemplateTypeTy, 2024 const DeclSpec &DS, 2025 SourceLocation IdLoc, 2026 Expr *InitList, 2027 SourceLocation EllipsisLoc) { 2028 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2029 DS, IdLoc, InitList, 2030 EllipsisLoc); 2031} 2032 2033/// \brief Handle a C++ member initializer using parentheses syntax. 2034MemInitResult 2035Sema::ActOnMemInitializer(Decl *ConstructorD, 2036 Scope *S, 2037 CXXScopeSpec &SS, 2038 IdentifierInfo *MemberOrBase, 2039 ParsedType TemplateTypeTy, 2040 const DeclSpec &DS, 2041 SourceLocation IdLoc, 2042 SourceLocation LParenLoc, 2043 Expr **Args, unsigned NumArgs, 2044 SourceLocation RParenLoc, 2045 SourceLocation EllipsisLoc) { 2046 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, 2047 llvm::makeArrayRef(Args, NumArgs), 2048 RParenLoc); 2049 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2050 DS, IdLoc, List, EllipsisLoc); 2051} 2052 2053namespace { 2054 2055// Callback to only accept typo corrections that can be a valid C++ member 2056// intializer: either a non-static field member or a base class. 2057class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 2058 public: 2059 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 2060 : ClassDecl(ClassDecl) {} 2061 2062 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 2063 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 2064 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 2065 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 2066 else 2067 return isa<TypeDecl>(ND); 2068 } 2069 return false; 2070 } 2071 2072 private: 2073 CXXRecordDecl *ClassDecl; 2074}; 2075 2076} 2077 2078/// \brief Handle a C++ member initializer. 2079MemInitResult 2080Sema::BuildMemInitializer(Decl *ConstructorD, 2081 Scope *S, 2082 CXXScopeSpec &SS, 2083 IdentifierInfo *MemberOrBase, 2084 ParsedType TemplateTypeTy, 2085 const DeclSpec &DS, 2086 SourceLocation IdLoc, 2087 Expr *Init, 2088 SourceLocation EllipsisLoc) { 2089 if (!ConstructorD) 2090 return true; 2091 2092 AdjustDeclIfTemplate(ConstructorD); 2093 2094 CXXConstructorDecl *Constructor 2095 = dyn_cast<CXXConstructorDecl>(ConstructorD); 2096 if (!Constructor) { 2097 // The user wrote a constructor initializer on a function that is 2098 // not a C++ constructor. Ignore the error for now, because we may 2099 // have more member initializers coming; we'll diagnose it just 2100 // once in ActOnMemInitializers. 2101 return true; 2102 } 2103 2104 CXXRecordDecl *ClassDecl = Constructor->getParent(); 2105 2106 // C++ [class.base.init]p2: 2107 // Names in a mem-initializer-id are looked up in the scope of the 2108 // constructor's class and, if not found in that scope, are looked 2109 // up in the scope containing the constructor's definition. 2110 // [Note: if the constructor's class contains a member with the 2111 // same name as a direct or virtual base class of the class, a 2112 // mem-initializer-id naming the member or base class and composed 2113 // of a single identifier refers to the class member. A 2114 // mem-initializer-id for the hidden base class may be specified 2115 // using a qualified name. ] 2116 if (!SS.getScopeRep() && !TemplateTypeTy) { 2117 // Look for a member, first. 2118 DeclContext::lookup_result Result 2119 = ClassDecl->lookup(MemberOrBase); 2120 if (Result.first != Result.second) { 2121 ValueDecl *Member; 2122 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 2123 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 2124 if (EllipsisLoc.isValid()) 2125 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 2126 << MemberOrBase 2127 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 2128 2129 return BuildMemberInitializer(Member, Init, IdLoc); 2130 } 2131 } 2132 } 2133 // It didn't name a member, so see if it names a class. 2134 QualType BaseType; 2135 TypeSourceInfo *TInfo = 0; 2136 2137 if (TemplateTypeTy) { 2138 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 2139 } else if (DS.getTypeSpecType() == TST_decltype) { 2140 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 2141 } else { 2142 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 2143 LookupParsedName(R, S, &SS); 2144 2145 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 2146 if (!TyD) { 2147 if (R.isAmbiguous()) return true; 2148 2149 // We don't want access-control diagnostics here. 2150 R.suppressDiagnostics(); 2151 2152 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 2153 bool NotUnknownSpecialization = false; 2154 DeclContext *DC = computeDeclContext(SS, false); 2155 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 2156 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 2157 2158 if (!NotUnknownSpecialization) { 2159 // When the scope specifier can refer to a member of an unknown 2160 // specialization, we take it as a type name. 2161 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 2162 SS.getWithLocInContext(Context), 2163 *MemberOrBase, IdLoc); 2164 if (BaseType.isNull()) 2165 return true; 2166 2167 R.clear(); 2168 R.setLookupName(MemberOrBase); 2169 } 2170 } 2171 2172 // If no results were found, try to correct typos. 2173 TypoCorrection Corr; 2174 MemInitializerValidatorCCC Validator(ClassDecl); 2175 if (R.empty() && BaseType.isNull() && 2176 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 2177 Validator, ClassDecl))) { 2178 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 2179 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 2180 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 2181 // We have found a non-static data member with a similar 2182 // name to what was typed; complain and initialize that 2183 // member. 2184 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2185 << MemberOrBase << true << CorrectedQuotedStr 2186 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2187 Diag(Member->getLocation(), diag::note_previous_decl) 2188 << CorrectedQuotedStr; 2189 2190 return BuildMemberInitializer(Member, Init, IdLoc); 2191 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 2192 const CXXBaseSpecifier *DirectBaseSpec; 2193 const CXXBaseSpecifier *VirtualBaseSpec; 2194 if (FindBaseInitializer(*this, ClassDecl, 2195 Context.getTypeDeclType(Type), 2196 DirectBaseSpec, VirtualBaseSpec)) { 2197 // We have found a direct or virtual base class with a 2198 // similar name to what was typed; complain and initialize 2199 // that base class. 2200 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2201 << MemberOrBase << false << CorrectedQuotedStr 2202 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2203 2204 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 2205 : VirtualBaseSpec; 2206 Diag(BaseSpec->getLocStart(), 2207 diag::note_base_class_specified_here) 2208 << BaseSpec->getType() 2209 << BaseSpec->getSourceRange(); 2210 2211 TyD = Type; 2212 } 2213 } 2214 } 2215 2216 if (!TyD && BaseType.isNull()) { 2217 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 2218 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 2219 return true; 2220 } 2221 } 2222 2223 if (BaseType.isNull()) { 2224 BaseType = Context.getTypeDeclType(TyD); 2225 if (SS.isSet()) { 2226 NestedNameSpecifier *Qualifier = 2227 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2228 2229 // FIXME: preserve source range information 2230 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 2231 } 2232 } 2233 } 2234 2235 if (!TInfo) 2236 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 2237 2238 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 2239} 2240 2241/// Checks a member initializer expression for cases where reference (or 2242/// pointer) members are bound to by-value parameters (or their addresses). 2243static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 2244 Expr *Init, 2245 SourceLocation IdLoc) { 2246 QualType MemberTy = Member->getType(); 2247 2248 // We only handle pointers and references currently. 2249 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 2250 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 2251 return; 2252 2253 const bool IsPointer = MemberTy->isPointerType(); 2254 if (IsPointer) { 2255 if (const UnaryOperator *Op 2256 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2257 // The only case we're worried about with pointers requires taking the 2258 // address. 2259 if (Op->getOpcode() != UO_AddrOf) 2260 return; 2261 2262 Init = Op->getSubExpr(); 2263 } else { 2264 // We only handle address-of expression initializers for pointers. 2265 return; 2266 } 2267 } 2268 2269 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 2270 // Taking the address of a temporary will be diagnosed as a hard error. 2271 if (IsPointer) 2272 return; 2273 2274 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 2275 << Member << Init->getSourceRange(); 2276 } else if (const DeclRefExpr *DRE 2277 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2278 // We only warn when referring to a non-reference parameter declaration. 2279 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2280 if (!Parameter || Parameter->getType()->isReferenceType()) 2281 return; 2282 2283 S.Diag(Init->getExprLoc(), 2284 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2285 : diag::warn_bind_ref_member_to_parameter) 2286 << Member << Parameter << Init->getSourceRange(); 2287 } else { 2288 // Other initializers are fine. 2289 return; 2290 } 2291 2292 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2293 << (unsigned)IsPointer; 2294} 2295 2296MemInitResult 2297Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2298 SourceLocation IdLoc) { 2299 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2300 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2301 assert((DirectMember || IndirectMember) && 2302 "Member must be a FieldDecl or IndirectFieldDecl"); 2303 2304 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2305 return true; 2306 2307 if (Member->isInvalidDecl()) 2308 return true; 2309 2310 // Diagnose value-uses of fields to initialize themselves, e.g. 2311 // foo(foo) 2312 // where foo is not also a parameter to the constructor. 2313 // TODO: implement -Wuninitialized and fold this into that framework. 2314 Expr **Args; 2315 unsigned NumArgs; 2316 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2317 Args = ParenList->getExprs(); 2318 NumArgs = ParenList->getNumExprs(); 2319 } else { 2320 InitListExpr *InitList = cast<InitListExpr>(Init); 2321 Args = InitList->getInits(); 2322 NumArgs = InitList->getNumInits(); 2323 } 2324 2325 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc) 2326 != DiagnosticsEngine::Ignored) 2327 for (unsigned i = 0; i < NumArgs; ++i) 2328 // FIXME: Warn about the case when other fields are used before being 2329 // initialized. For example, let this field be the i'th field. When 2330 // initializing the i'th field, throw a warning if any of the >= i'th 2331 // fields are used, as they are not yet initialized. 2332 // Right now we are only handling the case where the i'th field uses 2333 // itself in its initializer. 2334 // Also need to take into account that some fields may be initialized by 2335 // in-class initializers, see C++11 [class.base.init]p9. 2336 CheckInitExprContainsUninitializedFields(*this, Args[i], Member); 2337 2338 SourceRange InitRange = Init->getSourceRange(); 2339 2340 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2341 // Can't check initialization for a member of dependent type or when 2342 // any of the arguments are type-dependent expressions. 2343 DiscardCleanupsInEvaluationContext(); 2344 } else { 2345 bool InitList = false; 2346 if (isa<InitListExpr>(Init)) { 2347 InitList = true; 2348 Args = &Init; 2349 NumArgs = 1; 2350 2351 if (isStdInitializerList(Member->getType(), 0)) { 2352 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2353 << /*at end of ctor*/1 << InitRange; 2354 } 2355 } 2356 2357 // Initialize the member. 2358 InitializedEntity MemberEntity = 2359 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2360 : InitializedEntity::InitializeMember(IndirectMember, 0); 2361 InitializationKind Kind = 2362 InitList ? InitializationKind::CreateDirectList(IdLoc) 2363 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2364 InitRange.getEnd()); 2365 2366 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2367 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2368 MultiExprArg(Args, NumArgs), 2369 0); 2370 if (MemberInit.isInvalid()) 2371 return true; 2372 2373 CheckImplicitConversions(MemberInit.get(), 2374 InitRange.getBegin()); 2375 2376 // C++0x [class.base.init]p7: 2377 // The initialization of each base and member constitutes a 2378 // full-expression. 2379 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2380 if (MemberInit.isInvalid()) 2381 return true; 2382 2383 // If we are in a dependent context, template instantiation will 2384 // perform this type-checking again. Just save the arguments that we 2385 // received. 2386 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2387 // of the information that we have about the member 2388 // initializer. However, deconstructing the ASTs is a dicey process, 2389 // and this approach is far more likely to get the corner cases right. 2390 if (CurContext->isDependentContext()) { 2391 // The existing Init will do fine. 2392 } else { 2393 Init = MemberInit.get(); 2394 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2395 } 2396 } 2397 2398 if (DirectMember) { 2399 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2400 InitRange.getBegin(), Init, 2401 InitRange.getEnd()); 2402 } else { 2403 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2404 InitRange.getBegin(), Init, 2405 InitRange.getEnd()); 2406 } 2407} 2408 2409MemInitResult 2410Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2411 CXXRecordDecl *ClassDecl) { 2412 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2413 if (!LangOpts.CPlusPlus0x) 2414 return Diag(NameLoc, diag::err_delegating_ctor) 2415 << TInfo->getTypeLoc().getLocalSourceRange(); 2416 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2417 2418 bool InitList = true; 2419 Expr **Args = &Init; 2420 unsigned NumArgs = 1; 2421 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2422 InitList = false; 2423 Args = ParenList->getExprs(); 2424 NumArgs = ParenList->getNumExprs(); 2425 } 2426 2427 SourceRange InitRange = Init->getSourceRange(); 2428 // Initialize the object. 2429 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2430 QualType(ClassDecl->getTypeForDecl(), 0)); 2431 InitializationKind Kind = 2432 InitList ? InitializationKind::CreateDirectList(NameLoc) 2433 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2434 InitRange.getEnd()); 2435 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2436 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2437 MultiExprArg(Args, NumArgs), 2438 0); 2439 if (DelegationInit.isInvalid()) 2440 return true; 2441 2442 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2443 "Delegating constructor with no target?"); 2444 2445 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2446 2447 // C++0x [class.base.init]p7: 2448 // The initialization of each base and member constitutes a 2449 // full-expression. 2450 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2451 if (DelegationInit.isInvalid()) 2452 return true; 2453 2454 // If we are in a dependent context, template instantiation will 2455 // perform this type-checking again. Just save the arguments that we 2456 // received in a ParenListExpr. 2457 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2458 // of the information that we have about the base 2459 // initializer. However, deconstructing the ASTs is a dicey process, 2460 // and this approach is far more likely to get the corner cases right. 2461 if (CurContext->isDependentContext()) 2462 DelegationInit = Owned(Init); 2463 2464 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2465 DelegationInit.takeAs<Expr>(), 2466 InitRange.getEnd()); 2467} 2468 2469MemInitResult 2470Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2471 Expr *Init, CXXRecordDecl *ClassDecl, 2472 SourceLocation EllipsisLoc) { 2473 SourceLocation BaseLoc 2474 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2475 2476 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2477 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2478 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2479 2480 // C++ [class.base.init]p2: 2481 // [...] Unless the mem-initializer-id names a nonstatic data 2482 // member of the constructor's class or a direct or virtual base 2483 // of that class, the mem-initializer is ill-formed. A 2484 // mem-initializer-list can initialize a base class using any 2485 // name that denotes that base class type. 2486 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2487 2488 SourceRange InitRange = Init->getSourceRange(); 2489 if (EllipsisLoc.isValid()) { 2490 // This is a pack expansion. 2491 if (!BaseType->containsUnexpandedParameterPack()) { 2492 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2493 << SourceRange(BaseLoc, InitRange.getEnd()); 2494 2495 EllipsisLoc = SourceLocation(); 2496 } 2497 } else { 2498 // Check for any unexpanded parameter packs. 2499 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2500 return true; 2501 2502 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2503 return true; 2504 } 2505 2506 // Check for direct and virtual base classes. 2507 const CXXBaseSpecifier *DirectBaseSpec = 0; 2508 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2509 if (!Dependent) { 2510 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2511 BaseType)) 2512 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2513 2514 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2515 VirtualBaseSpec); 2516 2517 // C++ [base.class.init]p2: 2518 // Unless the mem-initializer-id names a nonstatic data member of the 2519 // constructor's class or a direct or virtual base of that class, the 2520 // mem-initializer is ill-formed. 2521 if (!DirectBaseSpec && !VirtualBaseSpec) { 2522 // If the class has any dependent bases, then it's possible that 2523 // one of those types will resolve to the same type as 2524 // BaseType. Therefore, just treat this as a dependent base 2525 // class initialization. FIXME: Should we try to check the 2526 // initialization anyway? It seems odd. 2527 if (ClassDecl->hasAnyDependentBases()) 2528 Dependent = true; 2529 else 2530 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2531 << BaseType << Context.getTypeDeclType(ClassDecl) 2532 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2533 } 2534 } 2535 2536 if (Dependent) { 2537 DiscardCleanupsInEvaluationContext(); 2538 2539 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2540 /*IsVirtual=*/false, 2541 InitRange.getBegin(), Init, 2542 InitRange.getEnd(), EllipsisLoc); 2543 } 2544 2545 // C++ [base.class.init]p2: 2546 // If a mem-initializer-id is ambiguous because it designates both 2547 // a direct non-virtual base class and an inherited virtual base 2548 // class, the mem-initializer is ill-formed. 2549 if (DirectBaseSpec && VirtualBaseSpec) 2550 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2551 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2552 2553 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2554 if (!BaseSpec) 2555 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2556 2557 // Initialize the base. 2558 bool InitList = true; 2559 Expr **Args = &Init; 2560 unsigned NumArgs = 1; 2561 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2562 InitList = false; 2563 Args = ParenList->getExprs(); 2564 NumArgs = ParenList->getNumExprs(); 2565 } 2566 2567 InitializedEntity BaseEntity = 2568 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2569 InitializationKind Kind = 2570 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2571 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2572 InitRange.getEnd()); 2573 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2574 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2575 MultiExprArg(Args, NumArgs), 0); 2576 if (BaseInit.isInvalid()) 2577 return true; 2578 2579 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2580 2581 // C++0x [class.base.init]p7: 2582 // The initialization of each base and member constitutes a 2583 // full-expression. 2584 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2585 if (BaseInit.isInvalid()) 2586 return true; 2587 2588 // If we are in a dependent context, template instantiation will 2589 // perform this type-checking again. Just save the arguments that we 2590 // received in a ParenListExpr. 2591 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2592 // of the information that we have about the base 2593 // initializer. However, deconstructing the ASTs is a dicey process, 2594 // and this approach is far more likely to get the corner cases right. 2595 if (CurContext->isDependentContext()) 2596 BaseInit = Owned(Init); 2597 2598 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2599 BaseSpec->isVirtual(), 2600 InitRange.getBegin(), 2601 BaseInit.takeAs<Expr>(), 2602 InitRange.getEnd(), EllipsisLoc); 2603} 2604 2605// Create a static_cast\<T&&>(expr). 2606static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2607 QualType ExprType = E->getType(); 2608 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2609 SourceLocation ExprLoc = E->getLocStart(); 2610 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2611 TargetType, ExprLoc); 2612 2613 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2614 SourceRange(ExprLoc, ExprLoc), 2615 E->getSourceRange()).take(); 2616} 2617 2618/// ImplicitInitializerKind - How an implicit base or member initializer should 2619/// initialize its base or member. 2620enum ImplicitInitializerKind { 2621 IIK_Default, 2622 IIK_Copy, 2623 IIK_Move 2624}; 2625 2626static bool 2627BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2628 ImplicitInitializerKind ImplicitInitKind, 2629 CXXBaseSpecifier *BaseSpec, 2630 bool IsInheritedVirtualBase, 2631 CXXCtorInitializer *&CXXBaseInit) { 2632 InitializedEntity InitEntity 2633 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2634 IsInheritedVirtualBase); 2635 2636 ExprResult BaseInit; 2637 2638 switch (ImplicitInitKind) { 2639 case IIK_Default: { 2640 InitializationKind InitKind 2641 = InitializationKind::CreateDefault(Constructor->getLocation()); 2642 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2643 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2644 break; 2645 } 2646 2647 case IIK_Move: 2648 case IIK_Copy: { 2649 bool Moving = ImplicitInitKind == IIK_Move; 2650 ParmVarDecl *Param = Constructor->getParamDecl(0); 2651 QualType ParamType = Param->getType().getNonReferenceType(); 2652 2653 Expr *CopyCtorArg = 2654 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2655 SourceLocation(), Param, false, 2656 Constructor->getLocation(), ParamType, 2657 VK_LValue, 0); 2658 2659 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2660 2661 // Cast to the base class to avoid ambiguities. 2662 QualType ArgTy = 2663 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2664 ParamType.getQualifiers()); 2665 2666 if (Moving) { 2667 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2668 } 2669 2670 CXXCastPath BasePath; 2671 BasePath.push_back(BaseSpec); 2672 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2673 CK_UncheckedDerivedToBase, 2674 Moving ? VK_XValue : VK_LValue, 2675 &BasePath).take(); 2676 2677 InitializationKind InitKind 2678 = InitializationKind::CreateDirect(Constructor->getLocation(), 2679 SourceLocation(), SourceLocation()); 2680 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2681 &CopyCtorArg, 1); 2682 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2683 MultiExprArg(&CopyCtorArg, 1)); 2684 break; 2685 } 2686 } 2687 2688 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2689 if (BaseInit.isInvalid()) 2690 return true; 2691 2692 CXXBaseInit = 2693 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2694 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2695 SourceLocation()), 2696 BaseSpec->isVirtual(), 2697 SourceLocation(), 2698 BaseInit.takeAs<Expr>(), 2699 SourceLocation(), 2700 SourceLocation()); 2701 2702 return false; 2703} 2704 2705static bool RefersToRValueRef(Expr *MemRef) { 2706 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2707 return Referenced->getType()->isRValueReferenceType(); 2708} 2709 2710static bool 2711BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2712 ImplicitInitializerKind ImplicitInitKind, 2713 FieldDecl *Field, IndirectFieldDecl *Indirect, 2714 CXXCtorInitializer *&CXXMemberInit) { 2715 if (Field->isInvalidDecl()) 2716 return true; 2717 2718 SourceLocation Loc = Constructor->getLocation(); 2719 2720 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2721 bool Moving = ImplicitInitKind == IIK_Move; 2722 ParmVarDecl *Param = Constructor->getParamDecl(0); 2723 QualType ParamType = Param->getType().getNonReferenceType(); 2724 2725 // Suppress copying zero-width bitfields. 2726 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2727 return false; 2728 2729 Expr *MemberExprBase = 2730 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2731 SourceLocation(), Param, false, 2732 Loc, ParamType, VK_LValue, 0); 2733 2734 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2735 2736 if (Moving) { 2737 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2738 } 2739 2740 // Build a reference to this field within the parameter. 2741 CXXScopeSpec SS; 2742 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2743 Sema::LookupMemberName); 2744 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2745 : cast<ValueDecl>(Field), AS_public); 2746 MemberLookup.resolveKind(); 2747 ExprResult CtorArg 2748 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2749 ParamType, Loc, 2750 /*IsArrow=*/false, 2751 SS, 2752 /*TemplateKWLoc=*/SourceLocation(), 2753 /*FirstQualifierInScope=*/0, 2754 MemberLookup, 2755 /*TemplateArgs=*/0); 2756 if (CtorArg.isInvalid()) 2757 return true; 2758 2759 // C++11 [class.copy]p15: 2760 // - if a member m has rvalue reference type T&&, it is direct-initialized 2761 // with static_cast<T&&>(x.m); 2762 if (RefersToRValueRef(CtorArg.get())) { 2763 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2764 } 2765 2766 // When the field we are copying is an array, create index variables for 2767 // each dimension of the array. We use these index variables to subscript 2768 // the source array, and other clients (e.g., CodeGen) will perform the 2769 // necessary iteration with these index variables. 2770 SmallVector<VarDecl *, 4> IndexVariables; 2771 QualType BaseType = Field->getType(); 2772 QualType SizeType = SemaRef.Context.getSizeType(); 2773 bool InitializingArray = false; 2774 while (const ConstantArrayType *Array 2775 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2776 InitializingArray = true; 2777 // Create the iteration variable for this array index. 2778 IdentifierInfo *IterationVarName = 0; 2779 { 2780 SmallString<8> Str; 2781 llvm::raw_svector_ostream OS(Str); 2782 OS << "__i" << IndexVariables.size(); 2783 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2784 } 2785 VarDecl *IterationVar 2786 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2787 IterationVarName, SizeType, 2788 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2789 SC_None, SC_None); 2790 IndexVariables.push_back(IterationVar); 2791 2792 // Create a reference to the iteration variable. 2793 ExprResult IterationVarRef 2794 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2795 assert(!IterationVarRef.isInvalid() && 2796 "Reference to invented variable cannot fail!"); 2797 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2798 assert(!IterationVarRef.isInvalid() && 2799 "Conversion of invented variable cannot fail!"); 2800 2801 // Subscript the array with this iteration variable. 2802 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2803 IterationVarRef.take(), 2804 Loc); 2805 if (CtorArg.isInvalid()) 2806 return true; 2807 2808 BaseType = Array->getElementType(); 2809 } 2810 2811 // The array subscript expression is an lvalue, which is wrong for moving. 2812 if (Moving && InitializingArray) 2813 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2814 2815 // Construct the entity that we will be initializing. For an array, this 2816 // will be first element in the array, which may require several levels 2817 // of array-subscript entities. 2818 SmallVector<InitializedEntity, 4> Entities; 2819 Entities.reserve(1 + IndexVariables.size()); 2820 if (Indirect) 2821 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2822 else 2823 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2824 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2825 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2826 0, 2827 Entities.back())); 2828 2829 // Direct-initialize to use the copy constructor. 2830 InitializationKind InitKind = 2831 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2832 2833 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2834 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2835 &CtorArgE, 1); 2836 2837 ExprResult MemberInit 2838 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2839 MultiExprArg(&CtorArgE, 1)); 2840 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2841 if (MemberInit.isInvalid()) 2842 return true; 2843 2844 if (Indirect) { 2845 assert(IndexVariables.size() == 0 && 2846 "Indirect field improperly initialized"); 2847 CXXMemberInit 2848 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2849 Loc, Loc, 2850 MemberInit.takeAs<Expr>(), 2851 Loc); 2852 } else 2853 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2854 Loc, MemberInit.takeAs<Expr>(), 2855 Loc, 2856 IndexVariables.data(), 2857 IndexVariables.size()); 2858 return false; 2859 } 2860 2861 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2862 2863 QualType FieldBaseElementType = 2864 SemaRef.Context.getBaseElementType(Field->getType()); 2865 2866 if (FieldBaseElementType->isRecordType()) { 2867 InitializedEntity InitEntity 2868 = Indirect? InitializedEntity::InitializeMember(Indirect) 2869 : InitializedEntity::InitializeMember(Field); 2870 InitializationKind InitKind = 2871 InitializationKind::CreateDefault(Loc); 2872 2873 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2874 ExprResult MemberInit = 2875 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2876 2877 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2878 if (MemberInit.isInvalid()) 2879 return true; 2880 2881 if (Indirect) 2882 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2883 Indirect, Loc, 2884 Loc, 2885 MemberInit.get(), 2886 Loc); 2887 else 2888 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2889 Field, Loc, Loc, 2890 MemberInit.get(), 2891 Loc); 2892 return false; 2893 } 2894 2895 if (!Field->getParent()->isUnion()) { 2896 if (FieldBaseElementType->isReferenceType()) { 2897 SemaRef.Diag(Constructor->getLocation(), 2898 diag::err_uninitialized_member_in_ctor) 2899 << (int)Constructor->isImplicit() 2900 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2901 << 0 << Field->getDeclName(); 2902 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2903 return true; 2904 } 2905 2906 if (FieldBaseElementType.isConstQualified()) { 2907 SemaRef.Diag(Constructor->getLocation(), 2908 diag::err_uninitialized_member_in_ctor) 2909 << (int)Constructor->isImplicit() 2910 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2911 << 1 << Field->getDeclName(); 2912 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2913 return true; 2914 } 2915 } 2916 2917 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2918 FieldBaseElementType->isObjCRetainableType() && 2919 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2920 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2921 // ARC: 2922 // Default-initialize Objective-C pointers to NULL. 2923 CXXMemberInit 2924 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2925 Loc, Loc, 2926 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2927 Loc); 2928 return false; 2929 } 2930 2931 // Nothing to initialize. 2932 CXXMemberInit = 0; 2933 return false; 2934} 2935 2936namespace { 2937struct BaseAndFieldInfo { 2938 Sema &S; 2939 CXXConstructorDecl *Ctor; 2940 bool AnyErrorsInInits; 2941 ImplicitInitializerKind IIK; 2942 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2943 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2944 2945 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2946 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2947 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2948 if (Generated && Ctor->isCopyConstructor()) 2949 IIK = IIK_Copy; 2950 else if (Generated && Ctor->isMoveConstructor()) 2951 IIK = IIK_Move; 2952 else 2953 IIK = IIK_Default; 2954 } 2955 2956 bool isImplicitCopyOrMove() const { 2957 switch (IIK) { 2958 case IIK_Copy: 2959 case IIK_Move: 2960 return true; 2961 2962 case IIK_Default: 2963 return false; 2964 } 2965 2966 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2967 } 2968 2969 bool addFieldInitializer(CXXCtorInitializer *Init) { 2970 AllToInit.push_back(Init); 2971 2972 // Check whether this initializer makes the field "used". 2973 if (Init->getInit() && Init->getInit()->HasSideEffects(S.Context)) 2974 S.UnusedPrivateFields.remove(Init->getAnyMember()); 2975 2976 return false; 2977 } 2978}; 2979} 2980 2981/// \brief Determine whether the given indirect field declaration is somewhere 2982/// within an anonymous union. 2983static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2984 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2985 CEnd = F->chain_end(); 2986 C != CEnd; ++C) 2987 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2988 if (Record->isUnion()) 2989 return true; 2990 2991 return false; 2992} 2993 2994/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2995/// array type. 2996static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2997 if (T->isIncompleteArrayType()) 2998 return true; 2999 3000 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 3001 if (!ArrayT->getSize()) 3002 return true; 3003 3004 T = ArrayT->getElementType(); 3005 } 3006 3007 return false; 3008} 3009 3010static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 3011 FieldDecl *Field, 3012 IndirectFieldDecl *Indirect = 0) { 3013 3014 // Overwhelmingly common case: we have a direct initializer for this field. 3015 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) 3016 return Info.addFieldInitializer(Init); 3017 3018 // C++11 [class.base.init]p8: if the entity is a non-static data member that 3019 // has a brace-or-equal-initializer, the entity is initialized as specified 3020 // in [dcl.init]. 3021 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 3022 CXXCtorInitializer *Init; 3023 if (Indirect) 3024 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 3025 SourceLocation(), 3026 SourceLocation(), 0, 3027 SourceLocation()); 3028 else 3029 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 3030 SourceLocation(), 3031 SourceLocation(), 0, 3032 SourceLocation()); 3033 return Info.addFieldInitializer(Init); 3034 } 3035 3036 // Don't build an implicit initializer for union members if none was 3037 // explicitly specified. 3038 if (Field->getParent()->isUnion() || 3039 (Indirect && isWithinAnonymousUnion(Indirect))) 3040 return false; 3041 3042 // Don't initialize incomplete or zero-length arrays. 3043 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 3044 return false; 3045 3046 // Don't try to build an implicit initializer if there were semantic 3047 // errors in any of the initializers (and therefore we might be 3048 // missing some that the user actually wrote). 3049 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 3050 return false; 3051 3052 CXXCtorInitializer *Init = 0; 3053 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 3054 Indirect, Init)) 3055 return true; 3056 3057 if (!Init) 3058 return false; 3059 3060 return Info.addFieldInitializer(Init); 3061} 3062 3063bool 3064Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 3065 CXXCtorInitializer *Initializer) { 3066 assert(Initializer->isDelegatingInitializer()); 3067 Constructor->setNumCtorInitializers(1); 3068 CXXCtorInitializer **initializer = 3069 new (Context) CXXCtorInitializer*[1]; 3070 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 3071 Constructor->setCtorInitializers(initializer); 3072 3073 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 3074 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 3075 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 3076 } 3077 3078 DelegatingCtorDecls.push_back(Constructor); 3079 3080 return false; 3081} 3082 3083bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 3084 CXXCtorInitializer **Initializers, 3085 unsigned NumInitializers, 3086 bool AnyErrors) { 3087 if (Constructor->isDependentContext()) { 3088 // Just store the initializers as written, they will be checked during 3089 // instantiation. 3090 if (NumInitializers > 0) { 3091 Constructor->setNumCtorInitializers(NumInitializers); 3092 CXXCtorInitializer **baseOrMemberInitializers = 3093 new (Context) CXXCtorInitializer*[NumInitializers]; 3094 memcpy(baseOrMemberInitializers, Initializers, 3095 NumInitializers * sizeof(CXXCtorInitializer*)); 3096 Constructor->setCtorInitializers(baseOrMemberInitializers); 3097 } 3098 3099 // Let template instantiation know whether we had errors. 3100 if (AnyErrors) 3101 Constructor->setInvalidDecl(); 3102 3103 return false; 3104 } 3105 3106 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 3107 3108 // We need to build the initializer AST according to order of construction 3109 // and not what user specified in the Initializers list. 3110 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 3111 if (!ClassDecl) 3112 return true; 3113 3114 bool HadError = false; 3115 3116 for (unsigned i = 0; i < NumInitializers; i++) { 3117 CXXCtorInitializer *Member = Initializers[i]; 3118 3119 if (Member->isBaseInitializer()) 3120 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 3121 else 3122 Info.AllBaseFields[Member->getAnyMember()] = Member; 3123 } 3124 3125 // Keep track of the direct virtual bases. 3126 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 3127 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 3128 E = ClassDecl->bases_end(); I != E; ++I) { 3129 if (I->isVirtual()) 3130 DirectVBases.insert(I); 3131 } 3132 3133 // Push virtual bases before others. 3134 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3135 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3136 3137 if (CXXCtorInitializer *Value 3138 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 3139 Info.AllToInit.push_back(Value); 3140 } else if (!AnyErrors) { 3141 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 3142 CXXCtorInitializer *CXXBaseInit; 3143 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3144 VBase, IsInheritedVirtualBase, 3145 CXXBaseInit)) { 3146 HadError = true; 3147 continue; 3148 } 3149 3150 Info.AllToInit.push_back(CXXBaseInit); 3151 } 3152 } 3153 3154 // Non-virtual bases. 3155 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3156 E = ClassDecl->bases_end(); Base != E; ++Base) { 3157 // Virtuals are in the virtual base list and already constructed. 3158 if (Base->isVirtual()) 3159 continue; 3160 3161 if (CXXCtorInitializer *Value 3162 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3163 Info.AllToInit.push_back(Value); 3164 } else if (!AnyErrors) { 3165 CXXCtorInitializer *CXXBaseInit; 3166 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3167 Base, /*IsInheritedVirtualBase=*/false, 3168 CXXBaseInit)) { 3169 HadError = true; 3170 continue; 3171 } 3172 3173 Info.AllToInit.push_back(CXXBaseInit); 3174 } 3175 } 3176 3177 // Fields. 3178 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3179 MemEnd = ClassDecl->decls_end(); 3180 Mem != MemEnd; ++Mem) { 3181 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3182 // C++ [class.bit]p2: 3183 // A declaration for a bit-field that omits the identifier declares an 3184 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3185 // initialized. 3186 if (F->isUnnamedBitfield()) 3187 continue; 3188 3189 // If we're not generating the implicit copy/move constructor, then we'll 3190 // handle anonymous struct/union fields based on their individual 3191 // indirect fields. 3192 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 3193 continue; 3194 3195 if (CollectFieldInitializer(*this, Info, F)) 3196 HadError = true; 3197 continue; 3198 } 3199 3200 // Beyond this point, we only consider default initialization. 3201 if (Info.IIK != IIK_Default) 3202 continue; 3203 3204 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3205 if (F->getType()->isIncompleteArrayType()) { 3206 assert(ClassDecl->hasFlexibleArrayMember() && 3207 "Incomplete array type is not valid"); 3208 continue; 3209 } 3210 3211 // Initialize each field of an anonymous struct individually. 3212 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3213 HadError = true; 3214 3215 continue; 3216 } 3217 } 3218 3219 NumInitializers = Info.AllToInit.size(); 3220 if (NumInitializers > 0) { 3221 Constructor->setNumCtorInitializers(NumInitializers); 3222 CXXCtorInitializer **baseOrMemberInitializers = 3223 new (Context) CXXCtorInitializer*[NumInitializers]; 3224 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3225 NumInitializers * sizeof(CXXCtorInitializer*)); 3226 Constructor->setCtorInitializers(baseOrMemberInitializers); 3227 3228 // Constructors implicitly reference the base and member 3229 // destructors. 3230 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3231 Constructor->getParent()); 3232 } 3233 3234 return HadError; 3235} 3236 3237static void *GetKeyForTopLevelField(FieldDecl *Field) { 3238 // For anonymous unions, use the class declaration as the key. 3239 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3240 if (RT->getDecl()->isAnonymousStructOrUnion()) 3241 return static_cast<void *>(RT->getDecl()); 3242 } 3243 return static_cast<void *>(Field); 3244} 3245 3246static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3247 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3248} 3249 3250static void *GetKeyForMember(ASTContext &Context, 3251 CXXCtorInitializer *Member) { 3252 if (!Member->isAnyMemberInitializer()) 3253 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3254 3255 // For fields injected into the class via declaration of an anonymous union, 3256 // use its anonymous union class declaration as the unique key. 3257 FieldDecl *Field = Member->getAnyMember(); 3258 3259 // If the field is a member of an anonymous struct or union, our key 3260 // is the anonymous record decl that's a direct child of the class. 3261 RecordDecl *RD = Field->getParent(); 3262 if (RD->isAnonymousStructOrUnion()) { 3263 while (true) { 3264 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3265 if (Parent->isAnonymousStructOrUnion()) 3266 RD = Parent; 3267 else 3268 break; 3269 } 3270 3271 return static_cast<void *>(RD); 3272 } 3273 3274 return static_cast<void *>(Field); 3275} 3276 3277static void 3278DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3279 const CXXConstructorDecl *Constructor, 3280 CXXCtorInitializer **Inits, 3281 unsigned NumInits) { 3282 if (Constructor->getDeclContext()->isDependentContext()) 3283 return; 3284 3285 // Don't check initializers order unless the warning is enabled at the 3286 // location of at least one initializer. 3287 bool ShouldCheckOrder = false; 3288 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3289 CXXCtorInitializer *Init = Inits[InitIndex]; 3290 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3291 Init->getSourceLocation()) 3292 != DiagnosticsEngine::Ignored) { 3293 ShouldCheckOrder = true; 3294 break; 3295 } 3296 } 3297 if (!ShouldCheckOrder) 3298 return; 3299 3300 // Build the list of bases and members in the order that they'll 3301 // actually be initialized. The explicit initializers should be in 3302 // this same order but may be missing things. 3303 SmallVector<const void*, 32> IdealInitKeys; 3304 3305 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3306 3307 // 1. Virtual bases. 3308 for (CXXRecordDecl::base_class_const_iterator VBase = 3309 ClassDecl->vbases_begin(), 3310 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3311 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3312 3313 // 2. Non-virtual bases. 3314 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3315 E = ClassDecl->bases_end(); Base != E; ++Base) { 3316 if (Base->isVirtual()) 3317 continue; 3318 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3319 } 3320 3321 // 3. Direct fields. 3322 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3323 E = ClassDecl->field_end(); Field != E; ++Field) { 3324 if (Field->isUnnamedBitfield()) 3325 continue; 3326 3327 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3328 } 3329 3330 unsigned NumIdealInits = IdealInitKeys.size(); 3331 unsigned IdealIndex = 0; 3332 3333 CXXCtorInitializer *PrevInit = 0; 3334 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3335 CXXCtorInitializer *Init = Inits[InitIndex]; 3336 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3337 3338 // Scan forward to try to find this initializer in the idealized 3339 // initializers list. 3340 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3341 if (InitKey == IdealInitKeys[IdealIndex]) 3342 break; 3343 3344 // If we didn't find this initializer, it must be because we 3345 // scanned past it on a previous iteration. That can only 3346 // happen if we're out of order; emit a warning. 3347 if (IdealIndex == NumIdealInits && PrevInit) { 3348 Sema::SemaDiagnosticBuilder D = 3349 SemaRef.Diag(PrevInit->getSourceLocation(), 3350 diag::warn_initializer_out_of_order); 3351 3352 if (PrevInit->isAnyMemberInitializer()) 3353 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3354 else 3355 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3356 3357 if (Init->isAnyMemberInitializer()) 3358 D << 0 << Init->getAnyMember()->getDeclName(); 3359 else 3360 D << 1 << Init->getTypeSourceInfo()->getType(); 3361 3362 // Move back to the initializer's location in the ideal list. 3363 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3364 if (InitKey == IdealInitKeys[IdealIndex]) 3365 break; 3366 3367 assert(IdealIndex != NumIdealInits && 3368 "initializer not found in initializer list"); 3369 } 3370 3371 PrevInit = Init; 3372 } 3373} 3374 3375namespace { 3376bool CheckRedundantInit(Sema &S, 3377 CXXCtorInitializer *Init, 3378 CXXCtorInitializer *&PrevInit) { 3379 if (!PrevInit) { 3380 PrevInit = Init; 3381 return false; 3382 } 3383 3384 if (FieldDecl *Field = Init->getMember()) 3385 S.Diag(Init->getSourceLocation(), 3386 diag::err_multiple_mem_initialization) 3387 << Field->getDeclName() 3388 << Init->getSourceRange(); 3389 else { 3390 const Type *BaseClass = Init->getBaseClass(); 3391 assert(BaseClass && "neither field nor base"); 3392 S.Diag(Init->getSourceLocation(), 3393 diag::err_multiple_base_initialization) 3394 << QualType(BaseClass, 0) 3395 << Init->getSourceRange(); 3396 } 3397 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3398 << 0 << PrevInit->getSourceRange(); 3399 3400 return true; 3401} 3402 3403typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3404typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3405 3406bool CheckRedundantUnionInit(Sema &S, 3407 CXXCtorInitializer *Init, 3408 RedundantUnionMap &Unions) { 3409 FieldDecl *Field = Init->getAnyMember(); 3410 RecordDecl *Parent = Field->getParent(); 3411 NamedDecl *Child = Field; 3412 3413 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3414 if (Parent->isUnion()) { 3415 UnionEntry &En = Unions[Parent]; 3416 if (En.first && En.first != Child) { 3417 S.Diag(Init->getSourceLocation(), 3418 diag::err_multiple_mem_union_initialization) 3419 << Field->getDeclName() 3420 << Init->getSourceRange(); 3421 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3422 << 0 << En.second->getSourceRange(); 3423 return true; 3424 } 3425 if (!En.first) { 3426 En.first = Child; 3427 En.second = Init; 3428 } 3429 if (!Parent->isAnonymousStructOrUnion()) 3430 return false; 3431 } 3432 3433 Child = Parent; 3434 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3435 } 3436 3437 return false; 3438} 3439} 3440 3441/// ActOnMemInitializers - Handle the member initializers for a constructor. 3442void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3443 SourceLocation ColonLoc, 3444 CXXCtorInitializer **meminits, 3445 unsigned NumMemInits, 3446 bool AnyErrors) { 3447 if (!ConstructorDecl) 3448 return; 3449 3450 AdjustDeclIfTemplate(ConstructorDecl); 3451 3452 CXXConstructorDecl *Constructor 3453 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3454 3455 if (!Constructor) { 3456 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3457 return; 3458 } 3459 3460 CXXCtorInitializer **MemInits = 3461 reinterpret_cast<CXXCtorInitializer **>(meminits); 3462 3463 // Mapping for the duplicate initializers check. 3464 // For member initializers, this is keyed with a FieldDecl*. 3465 // For base initializers, this is keyed with a Type*. 3466 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3467 3468 // Mapping for the inconsistent anonymous-union initializers check. 3469 RedundantUnionMap MemberUnions; 3470 3471 bool HadError = false; 3472 for (unsigned i = 0; i < NumMemInits; i++) { 3473 CXXCtorInitializer *Init = MemInits[i]; 3474 3475 // Set the source order index. 3476 Init->setSourceOrder(i); 3477 3478 if (Init->isAnyMemberInitializer()) { 3479 FieldDecl *Field = Init->getAnyMember(); 3480 if (CheckRedundantInit(*this, Init, Members[Field]) || 3481 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3482 HadError = true; 3483 } else if (Init->isBaseInitializer()) { 3484 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3485 if (CheckRedundantInit(*this, Init, Members[Key])) 3486 HadError = true; 3487 } else { 3488 assert(Init->isDelegatingInitializer()); 3489 // This must be the only initializer 3490 if (NumMemInits != 1) { 3491 Diag(Init->getSourceLocation(), 3492 diag::err_delegating_initializer_alone) 3493 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange(); 3494 // We will treat this as being the only initializer. 3495 } 3496 SetDelegatingInitializer(Constructor, MemInits[i]); 3497 // Return immediately as the initializer is set. 3498 return; 3499 } 3500 } 3501 3502 if (HadError) 3503 return; 3504 3505 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3506 3507 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3508} 3509 3510void 3511Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3512 CXXRecordDecl *ClassDecl) { 3513 // Ignore dependent contexts. Also ignore unions, since their members never 3514 // have destructors implicitly called. 3515 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3516 return; 3517 3518 // FIXME: all the access-control diagnostics are positioned on the 3519 // field/base declaration. That's probably good; that said, the 3520 // user might reasonably want to know why the destructor is being 3521 // emitted, and we currently don't say. 3522 3523 // Non-static data members. 3524 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3525 E = ClassDecl->field_end(); I != E; ++I) { 3526 FieldDecl *Field = *I; 3527 if (Field->isInvalidDecl()) 3528 continue; 3529 3530 // Don't destroy incomplete or zero-length arrays. 3531 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3532 continue; 3533 3534 QualType FieldType = Context.getBaseElementType(Field->getType()); 3535 3536 const RecordType* RT = FieldType->getAs<RecordType>(); 3537 if (!RT) 3538 continue; 3539 3540 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3541 if (FieldClassDecl->isInvalidDecl()) 3542 continue; 3543 if (FieldClassDecl->hasIrrelevantDestructor()) 3544 continue; 3545 // The destructor for an implicit anonymous union member is never invoked. 3546 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3547 continue; 3548 3549 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3550 assert(Dtor && "No dtor found for FieldClassDecl!"); 3551 CheckDestructorAccess(Field->getLocation(), Dtor, 3552 PDiag(diag::err_access_dtor_field) 3553 << Field->getDeclName() 3554 << FieldType); 3555 3556 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3557 DiagnoseUseOfDecl(Dtor, Location); 3558 } 3559 3560 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3561 3562 // Bases. 3563 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3564 E = ClassDecl->bases_end(); Base != E; ++Base) { 3565 // Bases are always records in a well-formed non-dependent class. 3566 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3567 3568 // Remember direct virtual bases. 3569 if (Base->isVirtual()) 3570 DirectVirtualBases.insert(RT); 3571 3572 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3573 // If our base class is invalid, we probably can't get its dtor anyway. 3574 if (BaseClassDecl->isInvalidDecl()) 3575 continue; 3576 if (BaseClassDecl->hasIrrelevantDestructor()) 3577 continue; 3578 3579 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3580 assert(Dtor && "No dtor found for BaseClassDecl!"); 3581 3582 // FIXME: caret should be on the start of the class name 3583 CheckDestructorAccess(Base->getLocStart(), Dtor, 3584 PDiag(diag::err_access_dtor_base) 3585 << Base->getType() 3586 << Base->getSourceRange(), 3587 Context.getTypeDeclType(ClassDecl)); 3588 3589 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3590 DiagnoseUseOfDecl(Dtor, Location); 3591 } 3592 3593 // Virtual bases. 3594 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3595 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3596 3597 // Bases are always records in a well-formed non-dependent class. 3598 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3599 3600 // Ignore direct virtual bases. 3601 if (DirectVirtualBases.count(RT)) 3602 continue; 3603 3604 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3605 // If our base class is invalid, we probably can't get its dtor anyway. 3606 if (BaseClassDecl->isInvalidDecl()) 3607 continue; 3608 if (BaseClassDecl->hasIrrelevantDestructor()) 3609 continue; 3610 3611 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3612 assert(Dtor && "No dtor found for BaseClassDecl!"); 3613 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3614 PDiag(diag::err_access_dtor_vbase) 3615 << VBase->getType(), 3616 Context.getTypeDeclType(ClassDecl)); 3617 3618 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3619 DiagnoseUseOfDecl(Dtor, Location); 3620 } 3621} 3622 3623void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3624 if (!CDtorDecl) 3625 return; 3626 3627 if (CXXConstructorDecl *Constructor 3628 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3629 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3630} 3631 3632bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3633 unsigned DiagID, AbstractDiagSelID SelID) { 3634 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3635 unsigned DiagID; 3636 AbstractDiagSelID SelID; 3637 3638 public: 3639 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3640 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3641 3642 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 3643 if (Suppressed) return; 3644 if (SelID == -1) 3645 S.Diag(Loc, DiagID) << T; 3646 else 3647 S.Diag(Loc, DiagID) << SelID << T; 3648 } 3649 } Diagnoser(DiagID, SelID); 3650 3651 return RequireNonAbstractType(Loc, T, Diagnoser); 3652} 3653 3654bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3655 TypeDiagnoser &Diagnoser) { 3656 if (!getLangOpts().CPlusPlus) 3657 return false; 3658 3659 if (const ArrayType *AT = Context.getAsArrayType(T)) 3660 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3661 3662 if (const PointerType *PT = T->getAs<PointerType>()) { 3663 // Find the innermost pointer type. 3664 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3665 PT = T; 3666 3667 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3668 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3669 } 3670 3671 const RecordType *RT = T->getAs<RecordType>(); 3672 if (!RT) 3673 return false; 3674 3675 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3676 3677 // We can't answer whether something is abstract until it has a 3678 // definition. If it's currently being defined, we'll walk back 3679 // over all the declarations when we have a full definition. 3680 const CXXRecordDecl *Def = RD->getDefinition(); 3681 if (!Def || Def->isBeingDefined()) 3682 return false; 3683 3684 if (!RD->isAbstract()) 3685 return false; 3686 3687 Diagnoser.diagnose(*this, Loc, T); 3688 DiagnoseAbstractType(RD); 3689 3690 return true; 3691} 3692 3693void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3694 // Check if we've already emitted the list of pure virtual functions 3695 // for this class. 3696 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3697 return; 3698 3699 CXXFinalOverriderMap FinalOverriders; 3700 RD->getFinalOverriders(FinalOverriders); 3701 3702 // Keep a set of seen pure methods so we won't diagnose the same method 3703 // more than once. 3704 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3705 3706 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3707 MEnd = FinalOverriders.end(); 3708 M != MEnd; 3709 ++M) { 3710 for (OverridingMethods::iterator SO = M->second.begin(), 3711 SOEnd = M->second.end(); 3712 SO != SOEnd; ++SO) { 3713 // C++ [class.abstract]p4: 3714 // A class is abstract if it contains or inherits at least one 3715 // pure virtual function for which the final overrider is pure 3716 // virtual. 3717 3718 // 3719 if (SO->second.size() != 1) 3720 continue; 3721 3722 if (!SO->second.front().Method->isPure()) 3723 continue; 3724 3725 if (!SeenPureMethods.insert(SO->second.front().Method)) 3726 continue; 3727 3728 Diag(SO->second.front().Method->getLocation(), 3729 diag::note_pure_virtual_function) 3730 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3731 } 3732 } 3733 3734 if (!PureVirtualClassDiagSet) 3735 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3736 PureVirtualClassDiagSet->insert(RD); 3737} 3738 3739namespace { 3740struct AbstractUsageInfo { 3741 Sema &S; 3742 CXXRecordDecl *Record; 3743 CanQualType AbstractType; 3744 bool Invalid; 3745 3746 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3747 : S(S), Record(Record), 3748 AbstractType(S.Context.getCanonicalType( 3749 S.Context.getTypeDeclType(Record))), 3750 Invalid(false) {} 3751 3752 void DiagnoseAbstractType() { 3753 if (Invalid) return; 3754 S.DiagnoseAbstractType(Record); 3755 Invalid = true; 3756 } 3757 3758 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3759}; 3760 3761struct CheckAbstractUsage { 3762 AbstractUsageInfo &Info; 3763 const NamedDecl *Ctx; 3764 3765 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3766 : Info(Info), Ctx(Ctx) {} 3767 3768 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3769 switch (TL.getTypeLocClass()) { 3770#define ABSTRACT_TYPELOC(CLASS, PARENT) 3771#define TYPELOC(CLASS, PARENT) \ 3772 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3773#include "clang/AST/TypeLocNodes.def" 3774 } 3775 } 3776 3777 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3778 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3779 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3780 if (!TL.getArg(I)) 3781 continue; 3782 3783 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3784 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3785 } 3786 } 3787 3788 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3789 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3790 } 3791 3792 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3793 // Visit the type parameters from a permissive context. 3794 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3795 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3796 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3797 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3798 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3799 // TODO: other template argument types? 3800 } 3801 } 3802 3803 // Visit pointee types from a permissive context. 3804#define CheckPolymorphic(Type) \ 3805 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3806 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3807 } 3808 CheckPolymorphic(PointerTypeLoc) 3809 CheckPolymorphic(ReferenceTypeLoc) 3810 CheckPolymorphic(MemberPointerTypeLoc) 3811 CheckPolymorphic(BlockPointerTypeLoc) 3812 CheckPolymorphic(AtomicTypeLoc) 3813 3814 /// Handle all the types we haven't given a more specific 3815 /// implementation for above. 3816 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3817 // Every other kind of type that we haven't called out already 3818 // that has an inner type is either (1) sugar or (2) contains that 3819 // inner type in some way as a subobject. 3820 if (TypeLoc Next = TL.getNextTypeLoc()) 3821 return Visit(Next, Sel); 3822 3823 // If there's no inner type and we're in a permissive context, 3824 // don't diagnose. 3825 if (Sel == Sema::AbstractNone) return; 3826 3827 // Check whether the type matches the abstract type. 3828 QualType T = TL.getType(); 3829 if (T->isArrayType()) { 3830 Sel = Sema::AbstractArrayType; 3831 T = Info.S.Context.getBaseElementType(T); 3832 } 3833 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3834 if (CT != Info.AbstractType) return; 3835 3836 // It matched; do some magic. 3837 if (Sel == Sema::AbstractArrayType) { 3838 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3839 << T << TL.getSourceRange(); 3840 } else { 3841 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3842 << Sel << T << TL.getSourceRange(); 3843 } 3844 Info.DiagnoseAbstractType(); 3845 } 3846}; 3847 3848void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3849 Sema::AbstractDiagSelID Sel) { 3850 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3851} 3852 3853} 3854 3855/// Check for invalid uses of an abstract type in a method declaration. 3856static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3857 CXXMethodDecl *MD) { 3858 // No need to do the check on definitions, which require that 3859 // the return/param types be complete. 3860 if (MD->doesThisDeclarationHaveABody()) 3861 return; 3862 3863 // For safety's sake, just ignore it if we don't have type source 3864 // information. This should never happen for non-implicit methods, 3865 // but... 3866 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3867 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3868} 3869 3870/// Check for invalid uses of an abstract type within a class definition. 3871static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3872 CXXRecordDecl *RD) { 3873 for (CXXRecordDecl::decl_iterator 3874 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3875 Decl *D = *I; 3876 if (D->isImplicit()) continue; 3877 3878 // Methods and method templates. 3879 if (isa<CXXMethodDecl>(D)) { 3880 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3881 } else if (isa<FunctionTemplateDecl>(D)) { 3882 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3883 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3884 3885 // Fields and static variables. 3886 } else if (isa<FieldDecl>(D)) { 3887 FieldDecl *FD = cast<FieldDecl>(D); 3888 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3889 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3890 } else if (isa<VarDecl>(D)) { 3891 VarDecl *VD = cast<VarDecl>(D); 3892 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3893 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3894 3895 // Nested classes and class templates. 3896 } else if (isa<CXXRecordDecl>(D)) { 3897 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3898 } else if (isa<ClassTemplateDecl>(D)) { 3899 CheckAbstractClassUsage(Info, 3900 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3901 } 3902 } 3903} 3904 3905/// \brief Perform semantic checks on a class definition that has been 3906/// completing, introducing implicitly-declared members, checking for 3907/// abstract types, etc. 3908void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3909 if (!Record) 3910 return; 3911 3912 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3913 AbstractUsageInfo Info(*this, Record); 3914 CheckAbstractClassUsage(Info, Record); 3915 } 3916 3917 // If this is not an aggregate type and has no user-declared constructor, 3918 // complain about any non-static data members of reference or const scalar 3919 // type, since they will never get initializers. 3920 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3921 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3922 !Record->isLambda()) { 3923 bool Complained = false; 3924 for (RecordDecl::field_iterator F = Record->field_begin(), 3925 FEnd = Record->field_end(); 3926 F != FEnd; ++F) { 3927 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3928 continue; 3929 3930 if (F->getType()->isReferenceType() || 3931 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3932 if (!Complained) { 3933 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3934 << Record->getTagKind() << Record; 3935 Complained = true; 3936 } 3937 3938 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3939 << F->getType()->isReferenceType() 3940 << F->getDeclName(); 3941 } 3942 } 3943 } 3944 3945 if (Record->isDynamicClass() && !Record->isDependentType()) 3946 DynamicClasses.push_back(Record); 3947 3948 if (Record->getIdentifier()) { 3949 // C++ [class.mem]p13: 3950 // If T is the name of a class, then each of the following shall have a 3951 // name different from T: 3952 // - every member of every anonymous union that is a member of class T. 3953 // 3954 // C++ [class.mem]p14: 3955 // In addition, if class T has a user-declared constructor (12.1), every 3956 // non-static data member of class T shall have a name different from T. 3957 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3958 R.first != R.second; ++R.first) { 3959 NamedDecl *D = *R.first; 3960 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3961 isa<IndirectFieldDecl>(D)) { 3962 Diag(D->getLocation(), diag::err_member_name_of_class) 3963 << D->getDeclName(); 3964 break; 3965 } 3966 } 3967 } 3968 3969 // Warn if the class has virtual methods but non-virtual public destructor. 3970 if (Record->isPolymorphic() && !Record->isDependentType()) { 3971 CXXDestructorDecl *dtor = Record->getDestructor(); 3972 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3973 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3974 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3975 } 3976 3977 if (Record->isAbstract() && Record->hasAttr<FinalAttr>()) { 3978 Diag(Record->getLocation(), diag::warn_abstract_final_class); 3979 DiagnoseAbstractType(Record); 3980 } 3981 3982 // See if a method overloads virtual methods in a base 3983 /// class without overriding any. 3984 if (!Record->isDependentType()) { 3985 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3986 MEnd = Record->method_end(); 3987 M != MEnd; ++M) { 3988 if (!M->isStatic()) 3989 DiagnoseHiddenVirtualMethods(Record, *M); 3990 } 3991 } 3992 3993 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3994 // function that is not a constructor declares that member function to be 3995 // const. [...] The class of which that function is a member shall be 3996 // a literal type. 3997 // 3998 // If the class has virtual bases, any constexpr members will already have 3999 // been diagnosed by the checks performed on the member declaration, so 4000 // suppress this (less useful) diagnostic. 4001 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 4002 !Record->isLiteral() && !Record->getNumVBases()) { 4003 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 4004 MEnd = Record->method_end(); 4005 M != MEnd; ++M) { 4006 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 4007 switch (Record->getTemplateSpecializationKind()) { 4008 case TSK_ImplicitInstantiation: 4009 case TSK_ExplicitInstantiationDeclaration: 4010 case TSK_ExplicitInstantiationDefinition: 4011 // If a template instantiates to a non-literal type, but its members 4012 // instantiate to constexpr functions, the template is technically 4013 // ill-formed, but we allow it for sanity. 4014 continue; 4015 4016 case TSK_Undeclared: 4017 case TSK_ExplicitSpecialization: 4018 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 4019 diag::err_constexpr_method_non_literal); 4020 break; 4021 } 4022 4023 // Only produce one error per class. 4024 break; 4025 } 4026 } 4027 } 4028 4029 // Declare inherited constructors. We do this eagerly here because: 4030 // - The standard requires an eager diagnostic for conflicting inherited 4031 // constructors from different classes. 4032 // - The lazy declaration of the other implicit constructors is so as to not 4033 // waste space and performance on classes that are not meant to be 4034 // instantiated (e.g. meta-functions). This doesn't apply to classes that 4035 // have inherited constructors. 4036 DeclareInheritedConstructors(Record); 4037} 4038 4039void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 4040 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 4041 ME = Record->method_end(); 4042 MI != ME; ++MI) 4043 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) 4044 CheckExplicitlyDefaultedSpecialMember(*MI); 4045} 4046 4047/// Is the special member function which would be selected to perform the 4048/// specified operation on the specified class type a constexpr constructor? 4049static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4050 Sema::CXXSpecialMember CSM, 4051 bool ConstArg) { 4052 Sema::SpecialMemberOverloadResult *SMOR = 4053 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 4054 false, false, false, false); 4055 if (!SMOR || !SMOR->getMethod()) 4056 // A constructor we wouldn't select can't be "involved in initializing" 4057 // anything. 4058 return true; 4059 return SMOR->getMethod()->isConstexpr(); 4060} 4061 4062/// Determine whether the specified special member function would be constexpr 4063/// if it were implicitly defined. 4064static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4065 Sema::CXXSpecialMember CSM, 4066 bool ConstArg) { 4067 if (!S.getLangOpts().CPlusPlus0x) 4068 return false; 4069 4070 // C++11 [dcl.constexpr]p4: 4071 // In the definition of a constexpr constructor [...] 4072 switch (CSM) { 4073 case Sema::CXXDefaultConstructor: 4074 // Since default constructor lookup is essentially trivial (and cannot 4075 // involve, for instance, template instantiation), we compute whether a 4076 // defaulted default constructor is constexpr directly within CXXRecordDecl. 4077 // 4078 // This is important for performance; we need to know whether the default 4079 // constructor is constexpr to determine whether the type is a literal type. 4080 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 4081 4082 case Sema::CXXCopyConstructor: 4083 case Sema::CXXMoveConstructor: 4084 // For copy or move constructors, we need to perform overload resolution. 4085 break; 4086 4087 case Sema::CXXCopyAssignment: 4088 case Sema::CXXMoveAssignment: 4089 case Sema::CXXDestructor: 4090 case Sema::CXXInvalid: 4091 return false; 4092 } 4093 4094 // -- if the class is a non-empty union, or for each non-empty anonymous 4095 // union member of a non-union class, exactly one non-static data member 4096 // shall be initialized; [DR1359] 4097 // 4098 // If we squint, this is guaranteed, since exactly one non-static data member 4099 // will be initialized (if the constructor isn't deleted), we just don't know 4100 // which one. 4101 if (ClassDecl->isUnion()) 4102 return true; 4103 4104 // -- the class shall not have any virtual base classes; 4105 if (ClassDecl->getNumVBases()) 4106 return false; 4107 4108 // -- every constructor involved in initializing [...] base class 4109 // sub-objects shall be a constexpr constructor; 4110 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4111 BEnd = ClassDecl->bases_end(); 4112 B != BEnd; ++B) { 4113 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 4114 if (!BaseType) continue; 4115 4116 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4117 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 4118 return false; 4119 } 4120 4121 // -- every constructor involved in initializing non-static data members 4122 // [...] shall be a constexpr constructor; 4123 // -- every non-static data member and base class sub-object shall be 4124 // initialized 4125 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4126 FEnd = ClassDecl->field_end(); 4127 F != FEnd; ++F) { 4128 if (F->isInvalidDecl()) 4129 continue; 4130 if (const RecordType *RecordTy = 4131 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4132 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4133 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 4134 return false; 4135 } 4136 } 4137 4138 // All OK, it's constexpr! 4139 return true; 4140} 4141 4142static Sema::ImplicitExceptionSpecification 4143computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 4144 switch (S.getSpecialMember(MD)) { 4145 case Sema::CXXDefaultConstructor: 4146 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 4147 case Sema::CXXCopyConstructor: 4148 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 4149 case Sema::CXXCopyAssignment: 4150 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 4151 case Sema::CXXMoveConstructor: 4152 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 4153 case Sema::CXXMoveAssignment: 4154 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 4155 case Sema::CXXDestructor: 4156 return S.ComputeDefaultedDtorExceptionSpec(MD); 4157 case Sema::CXXInvalid: 4158 break; 4159 } 4160 llvm_unreachable("only special members have implicit exception specs"); 4161} 4162 4163static void 4164updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4165 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4166 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4167 ExceptSpec.getEPI(EPI); 4168 const FunctionProtoType *NewFPT = cast<FunctionProtoType>( 4169 S.Context.getFunctionType(FPT->getResultType(), FPT->arg_type_begin(), 4170 FPT->getNumArgs(), EPI)); 4171 FD->setType(QualType(NewFPT, 0)); 4172} 4173 4174void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4175 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4176 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4177 return; 4178 4179 // Evaluate the exception specification. 4180 ImplicitExceptionSpecification ExceptSpec = 4181 computeImplicitExceptionSpec(*this, Loc, MD); 4182 4183 // Update the type of the special member to use it. 4184 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4185 4186 // A user-provided destructor can be defined outside the class. When that 4187 // happens, be sure to update the exception specification on both 4188 // declarations. 4189 const FunctionProtoType *CanonicalFPT = 4190 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4191 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4192 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4193 CanonicalFPT, ExceptSpec); 4194} 4195 4196static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl); 4197static bool isImplicitCopyAssignmentArgConst(Sema &S, CXXRecordDecl *ClassDecl); 4198 4199void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4200 CXXRecordDecl *RD = MD->getParent(); 4201 CXXSpecialMember CSM = getSpecialMember(MD); 4202 4203 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4204 "not an explicitly-defaulted special member"); 4205 4206 // Whether this was the first-declared instance of the constructor. 4207 // This affects whether we implicitly add an exception spec and constexpr. 4208 bool First = MD == MD->getCanonicalDecl(); 4209 4210 bool HadError = false; 4211 4212 // C++11 [dcl.fct.def.default]p1: 4213 // A function that is explicitly defaulted shall 4214 // -- be a special member function (checked elsewhere), 4215 // -- have the same type (except for ref-qualifiers, and except that a 4216 // copy operation can take a non-const reference) as an implicit 4217 // declaration, and 4218 // -- not have default arguments. 4219 unsigned ExpectedParams = 1; 4220 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4221 ExpectedParams = 0; 4222 if (MD->getNumParams() != ExpectedParams) { 4223 // This also checks for default arguments: a copy or move constructor with a 4224 // default argument is classified as a default constructor, and assignment 4225 // operations and destructors can't have default arguments. 4226 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4227 << CSM << MD->getSourceRange(); 4228 HadError = true; 4229 } 4230 4231 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4232 4233 // Compute argument constness, constexpr, and triviality. 4234 bool CanHaveConstParam = false; 4235 bool Trivial = false; 4236 switch (CSM) { 4237 case CXXDefaultConstructor: 4238 Trivial = RD->hasTrivialDefaultConstructor(); 4239 break; 4240 case CXXCopyConstructor: 4241 CanHaveConstParam = isImplicitCopyCtorArgConst(*this, RD); 4242 Trivial = RD->hasTrivialCopyConstructor(); 4243 break; 4244 case CXXCopyAssignment: 4245 CanHaveConstParam = isImplicitCopyAssignmentArgConst(*this, RD); 4246 Trivial = RD->hasTrivialCopyAssignment(); 4247 break; 4248 case CXXMoveConstructor: 4249 Trivial = RD->hasTrivialMoveConstructor(); 4250 break; 4251 case CXXMoveAssignment: 4252 Trivial = RD->hasTrivialMoveAssignment(); 4253 break; 4254 case CXXDestructor: 4255 Trivial = RD->hasTrivialDestructor(); 4256 break; 4257 case CXXInvalid: 4258 llvm_unreachable("non-special member explicitly defaulted!"); 4259 } 4260 4261 QualType ReturnType = Context.VoidTy; 4262 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4263 // Check for return type matching. 4264 ReturnType = Type->getResultType(); 4265 QualType ExpectedReturnType = 4266 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4267 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4268 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4269 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4270 HadError = true; 4271 } 4272 4273 // A defaulted special member cannot have cv-qualifiers. 4274 if (Type->getTypeQuals()) { 4275 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4276 << (CSM == CXXMoveAssignment); 4277 HadError = true; 4278 } 4279 } 4280 4281 // Check for parameter type matching. 4282 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4283 bool HasConstParam = false; 4284 if (ExpectedParams && ArgType->isReferenceType()) { 4285 // Argument must be reference to possibly-const T. 4286 QualType ReferentType = ArgType->getPointeeType(); 4287 HasConstParam = ReferentType.isConstQualified(); 4288 4289 if (ReferentType.isVolatileQualified()) { 4290 Diag(MD->getLocation(), 4291 diag::err_defaulted_special_member_volatile_param) << CSM; 4292 HadError = true; 4293 } 4294 4295 if (HasConstParam && !CanHaveConstParam) { 4296 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4297 Diag(MD->getLocation(), 4298 diag::err_defaulted_special_member_copy_const_param) 4299 << (CSM == CXXCopyAssignment); 4300 // FIXME: Explain why this special member can't be const. 4301 } else { 4302 Diag(MD->getLocation(), 4303 diag::err_defaulted_special_member_move_const_param) 4304 << (CSM == CXXMoveAssignment); 4305 } 4306 HadError = true; 4307 } 4308 4309 // If a function is explicitly defaulted on its first declaration, it shall 4310 // have the same parameter type as if it had been implicitly declared. 4311 // (Presumably this is to prevent it from being trivial?) 4312 if (!HasConstParam && CanHaveConstParam && First) 4313 Diag(MD->getLocation(), 4314 diag::err_defaulted_special_member_copy_non_const_param) 4315 << (CSM == CXXCopyAssignment); 4316 } else if (ExpectedParams) { 4317 // A copy assignment operator can take its argument by value, but a 4318 // defaulted one cannot. 4319 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4320 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4321 HadError = true; 4322 } 4323 4324 // Rebuild the type with the implicit exception specification added, if we 4325 // are going to need it. 4326 const FunctionProtoType *ImplicitType = 0; 4327 if (First || Type->hasExceptionSpec()) { 4328 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4329 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4330 ImplicitType = cast<FunctionProtoType>( 4331 Context.getFunctionType(ReturnType, &ArgType, ExpectedParams, EPI)); 4332 } 4333 4334 // C++11 [dcl.fct.def.default]p2: 4335 // An explicitly-defaulted function may be declared constexpr only if it 4336 // would have been implicitly declared as constexpr, 4337 // Do not apply this rule to members of class templates, since core issue 1358 4338 // makes such functions always instantiate to constexpr functions. For 4339 // non-constructors, this is checked elsewhere. 4340 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4341 HasConstParam); 4342 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr && 4343 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4344 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4345 // FIXME: Explain why the constructor can't be constexpr. 4346 HadError = true; 4347 } 4348 // and may have an explicit exception-specification only if it is compatible 4349 // with the exception-specification on the implicit declaration. 4350 if (Type->hasExceptionSpec() && 4351 CheckEquivalentExceptionSpec( 4352 PDiag(diag::err_incorrect_defaulted_exception_spec) << CSM, 4353 PDiag(), ImplicitType, SourceLocation(), Type, MD->getLocation())) 4354 HadError = true; 4355 4356 // If a function is explicitly defaulted on its first declaration, 4357 if (First) { 4358 // -- it is implicitly considered to be constexpr if the implicit 4359 // definition would be, 4360 MD->setConstexpr(Constexpr); 4361 4362 // -- it is implicitly considered to have the same exception-specification 4363 // as if it had been implicitly declared, 4364 MD->setType(QualType(ImplicitType, 0)); 4365 4366 // Such a function is also trivial if the implicitly-declared function 4367 // would have been. 4368 MD->setTrivial(Trivial); 4369 } 4370 4371 if (ShouldDeleteSpecialMember(MD, CSM)) { 4372 if (First) { 4373 MD->setDeletedAsWritten(); 4374 } else { 4375 // C++11 [dcl.fct.def.default]p4: 4376 // [For a] user-provided explicitly-defaulted function [...] if such a 4377 // function is implicitly defined as deleted, the program is ill-formed. 4378 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4379 HadError = true; 4380 } 4381 } 4382 4383 if (HadError) 4384 MD->setInvalidDecl(); 4385} 4386 4387namespace { 4388struct SpecialMemberDeletionInfo { 4389 Sema &S; 4390 CXXMethodDecl *MD; 4391 Sema::CXXSpecialMember CSM; 4392 bool Diagnose; 4393 4394 // Properties of the special member, computed for convenience. 4395 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4396 SourceLocation Loc; 4397 4398 bool AllFieldsAreConst; 4399 4400 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4401 Sema::CXXSpecialMember CSM, bool Diagnose) 4402 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4403 IsConstructor(false), IsAssignment(false), IsMove(false), 4404 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4405 AllFieldsAreConst(true) { 4406 switch (CSM) { 4407 case Sema::CXXDefaultConstructor: 4408 case Sema::CXXCopyConstructor: 4409 IsConstructor = true; 4410 break; 4411 case Sema::CXXMoveConstructor: 4412 IsConstructor = true; 4413 IsMove = true; 4414 break; 4415 case Sema::CXXCopyAssignment: 4416 IsAssignment = true; 4417 break; 4418 case Sema::CXXMoveAssignment: 4419 IsAssignment = true; 4420 IsMove = true; 4421 break; 4422 case Sema::CXXDestructor: 4423 break; 4424 case Sema::CXXInvalid: 4425 llvm_unreachable("invalid special member kind"); 4426 } 4427 4428 if (MD->getNumParams()) { 4429 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4430 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4431 } 4432 } 4433 4434 bool inUnion() const { return MD->getParent()->isUnion(); } 4435 4436 /// Look up the corresponding special member in the given class. 4437 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4438 unsigned Quals) { 4439 unsigned TQ = MD->getTypeQualifiers(); 4440 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4441 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4442 Quals = 0; 4443 return S.LookupSpecialMember(Class, CSM, 4444 ConstArg || (Quals & Qualifiers::Const), 4445 VolatileArg || (Quals & Qualifiers::Volatile), 4446 MD->getRefQualifier() == RQ_RValue, 4447 TQ & Qualifiers::Const, 4448 TQ & Qualifiers::Volatile); 4449 } 4450 4451 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4452 4453 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4454 bool shouldDeleteForField(FieldDecl *FD); 4455 bool shouldDeleteForAllConstMembers(); 4456 4457 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4458 unsigned Quals); 4459 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4460 Sema::SpecialMemberOverloadResult *SMOR, 4461 bool IsDtorCallInCtor); 4462 4463 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4464}; 4465} 4466 4467/// Is the given special member inaccessible when used on the given 4468/// sub-object. 4469bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4470 CXXMethodDecl *target) { 4471 /// If we're operating on a base class, the object type is the 4472 /// type of this special member. 4473 QualType objectTy; 4474 AccessSpecifier access = target->getAccess(); 4475 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4476 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4477 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4478 4479 // If we're operating on a field, the object type is the type of the field. 4480 } else { 4481 objectTy = S.Context.getTypeDeclType(target->getParent()); 4482 } 4483 4484 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4485} 4486 4487/// Check whether we should delete a special member due to the implicit 4488/// definition containing a call to a special member of a subobject. 4489bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4490 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4491 bool IsDtorCallInCtor) { 4492 CXXMethodDecl *Decl = SMOR->getMethod(); 4493 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4494 4495 int DiagKind = -1; 4496 4497 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4498 DiagKind = !Decl ? 0 : 1; 4499 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4500 DiagKind = 2; 4501 else if (!isAccessible(Subobj, Decl)) 4502 DiagKind = 3; 4503 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4504 !Decl->isTrivial()) { 4505 // A member of a union must have a trivial corresponding special member. 4506 // As a weird special case, a destructor call from a union's constructor 4507 // must be accessible and non-deleted, but need not be trivial. Such a 4508 // destructor is never actually called, but is semantically checked as 4509 // if it were. 4510 DiagKind = 4; 4511 } 4512 4513 if (DiagKind == -1) 4514 return false; 4515 4516 if (Diagnose) { 4517 if (Field) { 4518 S.Diag(Field->getLocation(), 4519 diag::note_deleted_special_member_class_subobject) 4520 << CSM << MD->getParent() << /*IsField*/true 4521 << Field << DiagKind << IsDtorCallInCtor; 4522 } else { 4523 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4524 S.Diag(Base->getLocStart(), 4525 diag::note_deleted_special_member_class_subobject) 4526 << CSM << MD->getParent() << /*IsField*/false 4527 << Base->getType() << DiagKind << IsDtorCallInCtor; 4528 } 4529 4530 if (DiagKind == 1) 4531 S.NoteDeletedFunction(Decl); 4532 // FIXME: Explain inaccessibility if DiagKind == 3. 4533 } 4534 4535 return true; 4536} 4537 4538/// Check whether we should delete a special member function due to having a 4539/// direct or virtual base class or non-static data member of class type M. 4540bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4541 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 4542 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4543 4544 // C++11 [class.ctor]p5: 4545 // -- any direct or virtual base class, or non-static data member with no 4546 // brace-or-equal-initializer, has class type M (or array thereof) and 4547 // either M has no default constructor or overload resolution as applied 4548 // to M's default constructor results in an ambiguity or in a function 4549 // that is deleted or inaccessible 4550 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4551 // -- a direct or virtual base class B that cannot be copied/moved because 4552 // overload resolution, as applied to B's corresponding special member, 4553 // results in an ambiguity or a function that is deleted or inaccessible 4554 // from the defaulted special member 4555 // C++11 [class.dtor]p5: 4556 // -- any direct or virtual base class [...] has a type with a destructor 4557 // that is deleted or inaccessible 4558 if (!(CSM == Sema::CXXDefaultConstructor && 4559 Field && Field->hasInClassInitializer()) && 4560 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 4561 return true; 4562 4563 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4564 // -- any direct or virtual base class or non-static data member has a 4565 // type with a destructor that is deleted or inaccessible 4566 if (IsConstructor) { 4567 Sema::SpecialMemberOverloadResult *SMOR = 4568 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4569 false, false, false, false, false); 4570 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4571 return true; 4572 } 4573 4574 return false; 4575} 4576 4577/// Check whether we should delete a special member function due to the class 4578/// having a particular direct or virtual base class. 4579bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4580 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4581 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 4582} 4583 4584/// Check whether we should delete a special member function due to the class 4585/// having a particular non-static data member. 4586bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4587 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4588 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4589 4590 if (CSM == Sema::CXXDefaultConstructor) { 4591 // For a default constructor, all references must be initialized in-class 4592 // and, if a union, it must have a non-const member. 4593 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4594 if (Diagnose) 4595 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4596 << MD->getParent() << FD << FieldType << /*Reference*/0; 4597 return true; 4598 } 4599 // C++11 [class.ctor]p5: any non-variant non-static data member of 4600 // const-qualified type (or array thereof) with no 4601 // brace-or-equal-initializer does not have a user-provided default 4602 // constructor. 4603 if (!inUnion() && FieldType.isConstQualified() && 4604 !FD->hasInClassInitializer() && 4605 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4606 if (Diagnose) 4607 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4608 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4609 return true; 4610 } 4611 4612 if (inUnion() && !FieldType.isConstQualified()) 4613 AllFieldsAreConst = false; 4614 } else if (CSM == Sema::CXXCopyConstructor) { 4615 // For a copy constructor, data members must not be of rvalue reference 4616 // type. 4617 if (FieldType->isRValueReferenceType()) { 4618 if (Diagnose) 4619 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4620 << MD->getParent() << FD << FieldType; 4621 return true; 4622 } 4623 } else if (IsAssignment) { 4624 // For an assignment operator, data members must not be of reference type. 4625 if (FieldType->isReferenceType()) { 4626 if (Diagnose) 4627 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4628 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4629 return true; 4630 } 4631 if (!FieldRecord && FieldType.isConstQualified()) { 4632 // C++11 [class.copy]p23: 4633 // -- a non-static data member of const non-class type (or array thereof) 4634 if (Diagnose) 4635 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4636 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4637 return true; 4638 } 4639 } 4640 4641 if (FieldRecord) { 4642 // Some additional restrictions exist on the variant members. 4643 if (!inUnion() && FieldRecord->isUnion() && 4644 FieldRecord->isAnonymousStructOrUnion()) { 4645 bool AllVariantFieldsAreConst = true; 4646 4647 // FIXME: Handle anonymous unions declared within anonymous unions. 4648 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4649 UE = FieldRecord->field_end(); 4650 UI != UE; ++UI) { 4651 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4652 4653 if (!UnionFieldType.isConstQualified()) 4654 AllVariantFieldsAreConst = false; 4655 4656 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4657 if (UnionFieldRecord && 4658 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 4659 UnionFieldType.getCVRQualifiers())) 4660 return true; 4661 } 4662 4663 // At least one member in each anonymous union must be non-const 4664 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4665 FieldRecord->field_begin() != FieldRecord->field_end()) { 4666 if (Diagnose) 4667 S.Diag(FieldRecord->getLocation(), 4668 diag::note_deleted_default_ctor_all_const) 4669 << MD->getParent() << /*anonymous union*/1; 4670 return true; 4671 } 4672 4673 // Don't check the implicit member of the anonymous union type. 4674 // This is technically non-conformant, but sanity demands it. 4675 return false; 4676 } 4677 4678 if (shouldDeleteForClassSubobject(FieldRecord, FD, 4679 FieldType.getCVRQualifiers())) 4680 return true; 4681 } 4682 4683 return false; 4684} 4685 4686/// C++11 [class.ctor] p5: 4687/// A defaulted default constructor for a class X is defined as deleted if 4688/// X is a union and all of its variant members are of const-qualified type. 4689bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4690 // This is a silly definition, because it gives an empty union a deleted 4691 // default constructor. Don't do that. 4692 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4693 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4694 if (Diagnose) 4695 S.Diag(MD->getParent()->getLocation(), 4696 diag::note_deleted_default_ctor_all_const) 4697 << MD->getParent() << /*not anonymous union*/0; 4698 return true; 4699 } 4700 return false; 4701} 4702 4703/// Determine whether a defaulted special member function should be defined as 4704/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4705/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4706bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4707 bool Diagnose) { 4708 if (MD->isInvalidDecl()) 4709 return false; 4710 CXXRecordDecl *RD = MD->getParent(); 4711 assert(!RD->isDependentType() && "do deletion after instantiation"); 4712 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4713 return false; 4714 4715 // C++11 [expr.lambda.prim]p19: 4716 // The closure type associated with a lambda-expression has a 4717 // deleted (8.4.3) default constructor and a deleted copy 4718 // assignment operator. 4719 if (RD->isLambda() && 4720 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4721 if (Diagnose) 4722 Diag(RD->getLocation(), diag::note_lambda_decl); 4723 return true; 4724 } 4725 4726 // For an anonymous struct or union, the copy and assignment special members 4727 // will never be used, so skip the check. For an anonymous union declared at 4728 // namespace scope, the constructor and destructor are used. 4729 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4730 RD->isAnonymousStructOrUnion()) 4731 return false; 4732 4733 // C++11 [class.copy]p7, p18: 4734 // If the class definition declares a move constructor or move assignment 4735 // operator, an implicitly declared copy constructor or copy assignment 4736 // operator is defined as deleted. 4737 if (MD->isImplicit() && 4738 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4739 CXXMethodDecl *UserDeclaredMove = 0; 4740 4741 // In Microsoft mode, a user-declared move only causes the deletion of the 4742 // corresponding copy operation, not both copy operations. 4743 if (RD->hasUserDeclaredMoveConstructor() && 4744 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4745 if (!Diagnose) return true; 4746 UserDeclaredMove = RD->getMoveConstructor(); 4747 assert(UserDeclaredMove); 4748 } else if (RD->hasUserDeclaredMoveAssignment() && 4749 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4750 if (!Diagnose) return true; 4751 UserDeclaredMove = RD->getMoveAssignmentOperator(); 4752 assert(UserDeclaredMove); 4753 } 4754 4755 if (UserDeclaredMove) { 4756 Diag(UserDeclaredMove->getLocation(), 4757 diag::note_deleted_copy_user_declared_move) 4758 << (CSM == CXXCopyAssignment) << RD 4759 << UserDeclaredMove->isMoveAssignmentOperator(); 4760 return true; 4761 } 4762 } 4763 4764 // Do access control from the special member function 4765 ContextRAII MethodContext(*this, MD); 4766 4767 // C++11 [class.dtor]p5: 4768 // -- for a virtual destructor, lookup of the non-array deallocation function 4769 // results in an ambiguity or in a function that is deleted or inaccessible 4770 if (CSM == CXXDestructor && MD->isVirtual()) { 4771 FunctionDecl *OperatorDelete = 0; 4772 DeclarationName Name = 4773 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4774 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4775 OperatorDelete, false)) { 4776 if (Diagnose) 4777 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4778 return true; 4779 } 4780 } 4781 4782 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4783 4784 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4785 BE = RD->bases_end(); BI != BE; ++BI) 4786 if (!BI->isVirtual() && 4787 SMI.shouldDeleteForBase(BI)) 4788 return true; 4789 4790 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4791 BE = RD->vbases_end(); BI != BE; ++BI) 4792 if (SMI.shouldDeleteForBase(BI)) 4793 return true; 4794 4795 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4796 FE = RD->field_end(); FI != FE; ++FI) 4797 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4798 SMI.shouldDeleteForField(*FI)) 4799 return true; 4800 4801 if (SMI.shouldDeleteForAllConstMembers()) 4802 return true; 4803 4804 return false; 4805} 4806 4807/// \brief Data used with FindHiddenVirtualMethod 4808namespace { 4809 struct FindHiddenVirtualMethodData { 4810 Sema *S; 4811 CXXMethodDecl *Method; 4812 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4813 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4814 }; 4815} 4816 4817/// \brief Check whether any most overriden method from MD in Methods 4818static bool CheckMostOverridenMethods(const CXXMethodDecl *MD, 4819 const llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 4820 if (MD->size_overridden_methods() == 0) 4821 return Methods.count(MD->getCanonicalDecl()); 4822 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4823 E = MD->end_overridden_methods(); 4824 I != E; ++I) 4825 if (CheckMostOverridenMethods(*I, Methods)) 4826 return true; 4827 return false; 4828} 4829 4830/// \brief Member lookup function that determines whether a given C++ 4831/// method overloads virtual methods in a base class without overriding any, 4832/// to be used with CXXRecordDecl::lookupInBases(). 4833static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4834 CXXBasePath &Path, 4835 void *UserData) { 4836 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4837 4838 FindHiddenVirtualMethodData &Data 4839 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4840 4841 DeclarationName Name = Data.Method->getDeclName(); 4842 assert(Name.getNameKind() == DeclarationName::Identifier); 4843 4844 bool foundSameNameMethod = false; 4845 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4846 for (Path.Decls = BaseRecord->lookup(Name); 4847 Path.Decls.first != Path.Decls.second; 4848 ++Path.Decls.first) { 4849 NamedDecl *D = *Path.Decls.first; 4850 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4851 MD = MD->getCanonicalDecl(); 4852 foundSameNameMethod = true; 4853 // Interested only in hidden virtual methods. 4854 if (!MD->isVirtual()) 4855 continue; 4856 // If the method we are checking overrides a method from its base 4857 // don't warn about the other overloaded methods. 4858 if (!Data.S->IsOverload(Data.Method, MD, false)) 4859 return true; 4860 // Collect the overload only if its hidden. 4861 if (!CheckMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods)) 4862 overloadedMethods.push_back(MD); 4863 } 4864 } 4865 4866 if (foundSameNameMethod) 4867 Data.OverloadedMethods.append(overloadedMethods.begin(), 4868 overloadedMethods.end()); 4869 return foundSameNameMethod; 4870} 4871 4872/// \brief Add the most overriden methods from MD to Methods 4873static void AddMostOverridenMethods(const CXXMethodDecl *MD, 4874 llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 4875 if (MD->size_overridden_methods() == 0) 4876 Methods.insert(MD->getCanonicalDecl()); 4877 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4878 E = MD->end_overridden_methods(); 4879 I != E; ++I) 4880 AddMostOverridenMethods(*I, Methods); 4881} 4882 4883/// \brief See if a method overloads virtual methods in a base class without 4884/// overriding any. 4885void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4886 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4887 MD->getLocation()) == DiagnosticsEngine::Ignored) 4888 return; 4889 if (!MD->getDeclName().isIdentifier()) 4890 return; 4891 4892 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4893 /*bool RecordPaths=*/false, 4894 /*bool DetectVirtual=*/false); 4895 FindHiddenVirtualMethodData Data; 4896 Data.Method = MD; 4897 Data.S = this; 4898 4899 // Keep the base methods that were overriden or introduced in the subclass 4900 // by 'using' in a set. A base method not in this set is hidden. 4901 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4902 res.first != res.second; ++res.first) { 4903 NamedDecl *ND = *res.first; 4904 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4905 ND = shad->getTargetDecl(); 4906 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND)) 4907 AddMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods); 4908 } 4909 4910 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4911 !Data.OverloadedMethods.empty()) { 4912 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4913 << MD << (Data.OverloadedMethods.size() > 1); 4914 4915 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4916 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4917 Diag(overloadedMD->getLocation(), 4918 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4919 } 4920 } 4921} 4922 4923void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4924 Decl *TagDecl, 4925 SourceLocation LBrac, 4926 SourceLocation RBrac, 4927 AttributeList *AttrList) { 4928 if (!TagDecl) 4929 return; 4930 4931 AdjustDeclIfTemplate(TagDecl); 4932 4933 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 4934 if (l->getKind() != AttributeList::AT_Visibility) 4935 continue; 4936 l->setInvalid(); 4937 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 4938 l->getName(); 4939 } 4940 4941 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4942 // strict aliasing violation! 4943 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4944 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4945 4946 CheckCompletedCXXClass( 4947 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4948} 4949 4950/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4951/// special functions, such as the default constructor, copy 4952/// constructor, or destructor, to the given C++ class (C++ 4953/// [special]p1). This routine can only be executed just before the 4954/// definition of the class is complete. 4955void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4956 if (!ClassDecl->hasUserDeclaredConstructor()) 4957 ++ASTContext::NumImplicitDefaultConstructors; 4958 4959 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4960 ++ASTContext::NumImplicitCopyConstructors; 4961 4962 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4963 ++ASTContext::NumImplicitMoveConstructors; 4964 4965 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4966 ++ASTContext::NumImplicitCopyAssignmentOperators; 4967 4968 // If we have a dynamic class, then the copy assignment operator may be 4969 // virtual, so we have to declare it immediately. This ensures that, e.g., 4970 // it shows up in the right place in the vtable and that we diagnose 4971 // problems with the implicit exception specification. 4972 if (ClassDecl->isDynamicClass()) 4973 DeclareImplicitCopyAssignment(ClassDecl); 4974 } 4975 4976 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()) { 4977 ++ASTContext::NumImplicitMoveAssignmentOperators; 4978 4979 // Likewise for the move assignment operator. 4980 if (ClassDecl->isDynamicClass()) 4981 DeclareImplicitMoveAssignment(ClassDecl); 4982 } 4983 4984 if (!ClassDecl->hasUserDeclaredDestructor()) { 4985 ++ASTContext::NumImplicitDestructors; 4986 4987 // If we have a dynamic class, then the destructor may be virtual, so we 4988 // have to declare the destructor immediately. This ensures that, e.g., it 4989 // shows up in the right place in the vtable and that we diagnose problems 4990 // with the implicit exception specification. 4991 if (ClassDecl->isDynamicClass()) 4992 DeclareImplicitDestructor(ClassDecl); 4993 } 4994} 4995 4996void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4997 if (!D) 4998 return; 4999 5000 int NumParamList = D->getNumTemplateParameterLists(); 5001 for (int i = 0; i < NumParamList; i++) { 5002 TemplateParameterList* Params = D->getTemplateParameterList(i); 5003 for (TemplateParameterList::iterator Param = Params->begin(), 5004 ParamEnd = Params->end(); 5005 Param != ParamEnd; ++Param) { 5006 NamedDecl *Named = cast<NamedDecl>(*Param); 5007 if (Named->getDeclName()) { 5008 S->AddDecl(Named); 5009 IdResolver.AddDecl(Named); 5010 } 5011 } 5012 } 5013} 5014 5015void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5016 if (!D) 5017 return; 5018 5019 TemplateParameterList *Params = 0; 5020 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5021 Params = Template->getTemplateParameters(); 5022 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5023 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5024 Params = PartialSpec->getTemplateParameters(); 5025 else 5026 return; 5027 5028 for (TemplateParameterList::iterator Param = Params->begin(), 5029 ParamEnd = Params->end(); 5030 Param != ParamEnd; ++Param) { 5031 NamedDecl *Named = cast<NamedDecl>(*Param); 5032 if (Named->getDeclName()) { 5033 S->AddDecl(Named); 5034 IdResolver.AddDecl(Named); 5035 } 5036 } 5037} 5038 5039void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5040 if (!RecordD) return; 5041 AdjustDeclIfTemplate(RecordD); 5042 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5043 PushDeclContext(S, Record); 5044} 5045 5046void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5047 if (!RecordD) return; 5048 PopDeclContext(); 5049} 5050 5051/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5052/// parsing a top-level (non-nested) C++ class, and we are now 5053/// parsing those parts of the given Method declaration that could 5054/// not be parsed earlier (C++ [class.mem]p2), such as default 5055/// arguments. This action should enter the scope of the given 5056/// Method declaration as if we had just parsed the qualified method 5057/// name. However, it should not bring the parameters into scope; 5058/// that will be performed by ActOnDelayedCXXMethodParameter. 5059void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5060} 5061 5062/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5063/// C++ method declaration. We're (re-)introducing the given 5064/// function parameter into scope for use in parsing later parts of 5065/// the method declaration. For example, we could see an 5066/// ActOnParamDefaultArgument event for this parameter. 5067void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5068 if (!ParamD) 5069 return; 5070 5071 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5072 5073 // If this parameter has an unparsed default argument, clear it out 5074 // to make way for the parsed default argument. 5075 if (Param->hasUnparsedDefaultArg()) 5076 Param->setDefaultArg(0); 5077 5078 S->AddDecl(Param); 5079 if (Param->getDeclName()) 5080 IdResolver.AddDecl(Param); 5081} 5082 5083/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5084/// processing the delayed method declaration for Method. The method 5085/// declaration is now considered finished. There may be a separate 5086/// ActOnStartOfFunctionDef action later (not necessarily 5087/// immediately!) for this method, if it was also defined inside the 5088/// class body. 5089void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5090 if (!MethodD) 5091 return; 5092 5093 AdjustDeclIfTemplate(MethodD); 5094 5095 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5096 5097 // Now that we have our default arguments, check the constructor 5098 // again. It could produce additional diagnostics or affect whether 5099 // the class has implicitly-declared destructors, among other 5100 // things. 5101 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5102 CheckConstructor(Constructor); 5103 5104 // Check the default arguments, which we may have added. 5105 if (!Method->isInvalidDecl()) 5106 CheckCXXDefaultArguments(Method); 5107} 5108 5109/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5110/// the well-formedness of the constructor declarator @p D with type @p 5111/// R. If there are any errors in the declarator, this routine will 5112/// emit diagnostics and set the invalid bit to true. In any case, the type 5113/// will be updated to reflect a well-formed type for the constructor and 5114/// returned. 5115QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5116 StorageClass &SC) { 5117 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5118 5119 // C++ [class.ctor]p3: 5120 // A constructor shall not be virtual (10.3) or static (9.4). A 5121 // constructor can be invoked for a const, volatile or const 5122 // volatile object. A constructor shall not be declared const, 5123 // volatile, or const volatile (9.3.2). 5124 if (isVirtual) { 5125 if (!D.isInvalidType()) 5126 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5127 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5128 << SourceRange(D.getIdentifierLoc()); 5129 D.setInvalidType(); 5130 } 5131 if (SC == SC_Static) { 5132 if (!D.isInvalidType()) 5133 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5134 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5135 << SourceRange(D.getIdentifierLoc()); 5136 D.setInvalidType(); 5137 SC = SC_None; 5138 } 5139 5140 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5141 if (FTI.TypeQuals != 0) { 5142 if (FTI.TypeQuals & Qualifiers::Const) 5143 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5144 << "const" << SourceRange(D.getIdentifierLoc()); 5145 if (FTI.TypeQuals & Qualifiers::Volatile) 5146 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5147 << "volatile" << SourceRange(D.getIdentifierLoc()); 5148 if (FTI.TypeQuals & Qualifiers::Restrict) 5149 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5150 << "restrict" << SourceRange(D.getIdentifierLoc()); 5151 D.setInvalidType(); 5152 } 5153 5154 // C++0x [class.ctor]p4: 5155 // A constructor shall not be declared with a ref-qualifier. 5156 if (FTI.hasRefQualifier()) { 5157 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5158 << FTI.RefQualifierIsLValueRef 5159 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5160 D.setInvalidType(); 5161 } 5162 5163 // Rebuild the function type "R" without any type qualifiers (in 5164 // case any of the errors above fired) and with "void" as the 5165 // return type, since constructors don't have return types. 5166 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5167 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5168 return R; 5169 5170 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5171 EPI.TypeQuals = 0; 5172 EPI.RefQualifier = RQ_None; 5173 5174 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5175 Proto->getNumArgs(), EPI); 5176} 5177 5178/// CheckConstructor - Checks a fully-formed constructor for 5179/// well-formedness, issuing any diagnostics required. Returns true if 5180/// the constructor declarator is invalid. 5181void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5182 CXXRecordDecl *ClassDecl 5183 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5184 if (!ClassDecl) 5185 return Constructor->setInvalidDecl(); 5186 5187 // C++ [class.copy]p3: 5188 // A declaration of a constructor for a class X is ill-formed if 5189 // its first parameter is of type (optionally cv-qualified) X and 5190 // either there are no other parameters or else all other 5191 // parameters have default arguments. 5192 if (!Constructor->isInvalidDecl() && 5193 ((Constructor->getNumParams() == 1) || 5194 (Constructor->getNumParams() > 1 && 5195 Constructor->getParamDecl(1)->hasDefaultArg())) && 5196 Constructor->getTemplateSpecializationKind() 5197 != TSK_ImplicitInstantiation) { 5198 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5199 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5200 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5201 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5202 const char *ConstRef 5203 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5204 : " const &"; 5205 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5206 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5207 5208 // FIXME: Rather that making the constructor invalid, we should endeavor 5209 // to fix the type. 5210 Constructor->setInvalidDecl(); 5211 } 5212 } 5213} 5214 5215/// CheckDestructor - Checks a fully-formed destructor definition for 5216/// well-formedness, issuing any diagnostics required. Returns true 5217/// on error. 5218bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5219 CXXRecordDecl *RD = Destructor->getParent(); 5220 5221 if (Destructor->isVirtual()) { 5222 SourceLocation Loc; 5223 5224 if (!Destructor->isImplicit()) 5225 Loc = Destructor->getLocation(); 5226 else 5227 Loc = RD->getLocation(); 5228 5229 // If we have a virtual destructor, look up the deallocation function 5230 FunctionDecl *OperatorDelete = 0; 5231 DeclarationName Name = 5232 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5233 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5234 return true; 5235 5236 MarkFunctionReferenced(Loc, OperatorDelete); 5237 5238 Destructor->setOperatorDelete(OperatorDelete); 5239 } 5240 5241 return false; 5242} 5243 5244static inline bool 5245FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5246 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5247 FTI.ArgInfo[0].Param && 5248 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5249} 5250 5251/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5252/// the well-formednes of the destructor declarator @p D with type @p 5253/// R. If there are any errors in the declarator, this routine will 5254/// emit diagnostics and set the declarator to invalid. Even if this happens, 5255/// will be updated to reflect a well-formed type for the destructor and 5256/// returned. 5257QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5258 StorageClass& SC) { 5259 // C++ [class.dtor]p1: 5260 // [...] A typedef-name that names a class is a class-name 5261 // (7.1.3); however, a typedef-name that names a class shall not 5262 // be used as the identifier in the declarator for a destructor 5263 // declaration. 5264 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5265 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5266 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5267 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5268 else if (const TemplateSpecializationType *TST = 5269 DeclaratorType->getAs<TemplateSpecializationType>()) 5270 if (TST->isTypeAlias()) 5271 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5272 << DeclaratorType << 1; 5273 5274 // C++ [class.dtor]p2: 5275 // A destructor is used to destroy objects of its class type. A 5276 // destructor takes no parameters, and no return type can be 5277 // specified for it (not even void). The address of a destructor 5278 // shall not be taken. A destructor shall not be static. A 5279 // destructor can be invoked for a const, volatile or const 5280 // volatile object. A destructor shall not be declared const, 5281 // volatile or const volatile (9.3.2). 5282 if (SC == SC_Static) { 5283 if (!D.isInvalidType()) 5284 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5285 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5286 << SourceRange(D.getIdentifierLoc()) 5287 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5288 5289 SC = SC_None; 5290 } 5291 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5292 // Destructors don't have return types, but the parser will 5293 // happily parse something like: 5294 // 5295 // class X { 5296 // float ~X(); 5297 // }; 5298 // 5299 // The return type will be eliminated later. 5300 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5301 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5302 << SourceRange(D.getIdentifierLoc()); 5303 } 5304 5305 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5306 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5307 if (FTI.TypeQuals & Qualifiers::Const) 5308 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5309 << "const" << SourceRange(D.getIdentifierLoc()); 5310 if (FTI.TypeQuals & Qualifiers::Volatile) 5311 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5312 << "volatile" << SourceRange(D.getIdentifierLoc()); 5313 if (FTI.TypeQuals & Qualifiers::Restrict) 5314 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5315 << "restrict" << SourceRange(D.getIdentifierLoc()); 5316 D.setInvalidType(); 5317 } 5318 5319 // C++0x [class.dtor]p2: 5320 // A destructor shall not be declared with a ref-qualifier. 5321 if (FTI.hasRefQualifier()) { 5322 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5323 << FTI.RefQualifierIsLValueRef 5324 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5325 D.setInvalidType(); 5326 } 5327 5328 // Make sure we don't have any parameters. 5329 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5330 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5331 5332 // Delete the parameters. 5333 FTI.freeArgs(); 5334 D.setInvalidType(); 5335 } 5336 5337 // Make sure the destructor isn't variadic. 5338 if (FTI.isVariadic) { 5339 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5340 D.setInvalidType(); 5341 } 5342 5343 // Rebuild the function type "R" without any type qualifiers or 5344 // parameters (in case any of the errors above fired) and with 5345 // "void" as the return type, since destructors don't have return 5346 // types. 5347 if (!D.isInvalidType()) 5348 return R; 5349 5350 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5351 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5352 EPI.Variadic = false; 5353 EPI.TypeQuals = 0; 5354 EPI.RefQualifier = RQ_None; 5355 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5356} 5357 5358/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5359/// well-formednes of the conversion function declarator @p D with 5360/// type @p R. If there are any errors in the declarator, this routine 5361/// will emit diagnostics and return true. Otherwise, it will return 5362/// false. Either way, the type @p R will be updated to reflect a 5363/// well-formed type for the conversion operator. 5364void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5365 StorageClass& SC) { 5366 // C++ [class.conv.fct]p1: 5367 // Neither parameter types nor return type can be specified. The 5368 // type of a conversion function (8.3.5) is "function taking no 5369 // parameter returning conversion-type-id." 5370 if (SC == SC_Static) { 5371 if (!D.isInvalidType()) 5372 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5373 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5374 << SourceRange(D.getIdentifierLoc()); 5375 D.setInvalidType(); 5376 SC = SC_None; 5377 } 5378 5379 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5380 5381 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5382 // Conversion functions don't have return types, but the parser will 5383 // happily parse something like: 5384 // 5385 // class X { 5386 // float operator bool(); 5387 // }; 5388 // 5389 // The return type will be changed later anyway. 5390 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5391 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5392 << SourceRange(D.getIdentifierLoc()); 5393 D.setInvalidType(); 5394 } 5395 5396 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5397 5398 // Make sure we don't have any parameters. 5399 if (Proto->getNumArgs() > 0) { 5400 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5401 5402 // Delete the parameters. 5403 D.getFunctionTypeInfo().freeArgs(); 5404 D.setInvalidType(); 5405 } else if (Proto->isVariadic()) { 5406 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5407 D.setInvalidType(); 5408 } 5409 5410 // Diagnose "&operator bool()" and other such nonsense. This 5411 // is actually a gcc extension which we don't support. 5412 if (Proto->getResultType() != ConvType) { 5413 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5414 << Proto->getResultType(); 5415 D.setInvalidType(); 5416 ConvType = Proto->getResultType(); 5417 } 5418 5419 // C++ [class.conv.fct]p4: 5420 // The conversion-type-id shall not represent a function type nor 5421 // an array type. 5422 if (ConvType->isArrayType()) { 5423 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5424 ConvType = Context.getPointerType(ConvType); 5425 D.setInvalidType(); 5426 } else if (ConvType->isFunctionType()) { 5427 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5428 ConvType = Context.getPointerType(ConvType); 5429 D.setInvalidType(); 5430 } 5431 5432 // Rebuild the function type "R" without any parameters (in case any 5433 // of the errors above fired) and with the conversion type as the 5434 // return type. 5435 if (D.isInvalidType()) 5436 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5437 5438 // C++0x explicit conversion operators. 5439 if (D.getDeclSpec().isExplicitSpecified()) 5440 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5441 getLangOpts().CPlusPlus0x ? 5442 diag::warn_cxx98_compat_explicit_conversion_functions : 5443 diag::ext_explicit_conversion_functions) 5444 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5445} 5446 5447/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5448/// the declaration of the given C++ conversion function. This routine 5449/// is responsible for recording the conversion function in the C++ 5450/// class, if possible. 5451Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5452 assert(Conversion && "Expected to receive a conversion function declaration"); 5453 5454 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5455 5456 // Make sure we aren't redeclaring the conversion function. 5457 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5458 5459 // C++ [class.conv.fct]p1: 5460 // [...] A conversion function is never used to convert a 5461 // (possibly cv-qualified) object to the (possibly cv-qualified) 5462 // same object type (or a reference to it), to a (possibly 5463 // cv-qualified) base class of that type (or a reference to it), 5464 // or to (possibly cv-qualified) void. 5465 // FIXME: Suppress this warning if the conversion function ends up being a 5466 // virtual function that overrides a virtual function in a base class. 5467 QualType ClassType 5468 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5469 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5470 ConvType = ConvTypeRef->getPointeeType(); 5471 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5472 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5473 /* Suppress diagnostics for instantiations. */; 5474 else if (ConvType->isRecordType()) { 5475 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5476 if (ConvType == ClassType) 5477 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5478 << ClassType; 5479 else if (IsDerivedFrom(ClassType, ConvType)) 5480 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5481 << ClassType << ConvType; 5482 } else if (ConvType->isVoidType()) { 5483 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5484 << ClassType << ConvType; 5485 } 5486 5487 if (FunctionTemplateDecl *ConversionTemplate 5488 = Conversion->getDescribedFunctionTemplate()) 5489 return ConversionTemplate; 5490 5491 return Conversion; 5492} 5493 5494//===----------------------------------------------------------------------===// 5495// Namespace Handling 5496//===----------------------------------------------------------------------===// 5497 5498/// \brief Diagnose a mismatch in 'inline' qualifiers when a namespace is 5499/// reopened. 5500static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc, 5501 SourceLocation Loc, 5502 IdentifierInfo *II, bool *IsInline, 5503 NamespaceDecl *PrevNS) { 5504 assert(*IsInline != PrevNS->isInline()); 5505 5506 // HACK: Work around a bug in libstdc++4.6's <atomic>, where 5507 // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as 5508 // inline namespaces, with the intention of bringing names into namespace std. 5509 // 5510 // We support this just well enough to get that case working; this is not 5511 // sufficient to support reopening namespaces as inline in general. 5512 if (*IsInline && II && II->getName().startswith("__atomic") && 5513 S.getSourceManager().isInSystemHeader(Loc)) { 5514 // Mark all prior declarations of the namespace as inline. 5515 for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS; 5516 NS = NS->getPreviousDecl()) 5517 NS->setInline(*IsInline); 5518 // Patch up the lookup table for the containing namespace. This isn't really 5519 // correct, but it's good enough for this particular case. 5520 for (DeclContext::decl_iterator I = PrevNS->decls_begin(), 5521 E = PrevNS->decls_end(); I != E; ++I) 5522 if (NamedDecl *ND = dyn_cast<NamedDecl>(*I)) 5523 PrevNS->getParent()->makeDeclVisibleInContext(ND); 5524 return; 5525 } 5526 5527 if (PrevNS->isInline()) 5528 // The user probably just forgot the 'inline', so suggest that it 5529 // be added back. 5530 S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5531 << FixItHint::CreateInsertion(KeywordLoc, "inline "); 5532 else 5533 S.Diag(Loc, diag::err_inline_namespace_mismatch) 5534 << IsInline; 5535 5536 S.Diag(PrevNS->getLocation(), diag::note_previous_definition); 5537 *IsInline = PrevNS->isInline(); 5538} 5539 5540/// ActOnStartNamespaceDef - This is called at the start of a namespace 5541/// definition. 5542Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5543 SourceLocation InlineLoc, 5544 SourceLocation NamespaceLoc, 5545 SourceLocation IdentLoc, 5546 IdentifierInfo *II, 5547 SourceLocation LBrace, 5548 AttributeList *AttrList) { 5549 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5550 // For anonymous namespace, take the location of the left brace. 5551 SourceLocation Loc = II ? IdentLoc : LBrace; 5552 bool IsInline = InlineLoc.isValid(); 5553 bool IsInvalid = false; 5554 bool IsStd = false; 5555 bool AddToKnown = false; 5556 Scope *DeclRegionScope = NamespcScope->getParent(); 5557 5558 NamespaceDecl *PrevNS = 0; 5559 if (II) { 5560 // C++ [namespace.def]p2: 5561 // The identifier in an original-namespace-definition shall not 5562 // have been previously defined in the declarative region in 5563 // which the original-namespace-definition appears. The 5564 // identifier in an original-namespace-definition is the name of 5565 // the namespace. Subsequently in that declarative region, it is 5566 // treated as an original-namespace-name. 5567 // 5568 // Since namespace names are unique in their scope, and we don't 5569 // look through using directives, just look for any ordinary names. 5570 5571 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5572 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5573 Decl::IDNS_Namespace; 5574 NamedDecl *PrevDecl = 0; 5575 for (DeclContext::lookup_result R 5576 = CurContext->getRedeclContext()->lookup(II); 5577 R.first != R.second; ++R.first) { 5578 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5579 PrevDecl = *R.first; 5580 break; 5581 } 5582 } 5583 5584 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5585 5586 if (PrevNS) { 5587 // This is an extended namespace definition. 5588 if (IsInline != PrevNS->isInline()) 5589 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II, 5590 &IsInline, PrevNS); 5591 } else if (PrevDecl) { 5592 // This is an invalid name redefinition. 5593 Diag(Loc, diag::err_redefinition_different_kind) 5594 << II; 5595 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5596 IsInvalid = true; 5597 // Continue on to push Namespc as current DeclContext and return it. 5598 } else if (II->isStr("std") && 5599 CurContext->getRedeclContext()->isTranslationUnit()) { 5600 // This is the first "real" definition of the namespace "std", so update 5601 // our cache of the "std" namespace to point at this definition. 5602 PrevNS = getStdNamespace(); 5603 IsStd = true; 5604 AddToKnown = !IsInline; 5605 } else { 5606 // We've seen this namespace for the first time. 5607 AddToKnown = !IsInline; 5608 } 5609 } else { 5610 // Anonymous namespaces. 5611 5612 // Determine whether the parent already has an anonymous namespace. 5613 DeclContext *Parent = CurContext->getRedeclContext(); 5614 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5615 PrevNS = TU->getAnonymousNamespace(); 5616 } else { 5617 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5618 PrevNS = ND->getAnonymousNamespace(); 5619 } 5620 5621 if (PrevNS && IsInline != PrevNS->isInline()) 5622 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II, 5623 &IsInline, PrevNS); 5624 } 5625 5626 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5627 StartLoc, Loc, II, PrevNS); 5628 if (IsInvalid) 5629 Namespc->setInvalidDecl(); 5630 5631 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5632 5633 // FIXME: Should we be merging attributes? 5634 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5635 PushNamespaceVisibilityAttr(Attr, Loc); 5636 5637 if (IsStd) 5638 StdNamespace = Namespc; 5639 if (AddToKnown) 5640 KnownNamespaces[Namespc] = false; 5641 5642 if (II) { 5643 PushOnScopeChains(Namespc, DeclRegionScope); 5644 } else { 5645 // Link the anonymous namespace into its parent. 5646 DeclContext *Parent = CurContext->getRedeclContext(); 5647 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5648 TU->setAnonymousNamespace(Namespc); 5649 } else { 5650 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5651 } 5652 5653 CurContext->addDecl(Namespc); 5654 5655 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5656 // behaves as if it were replaced by 5657 // namespace unique { /* empty body */ } 5658 // using namespace unique; 5659 // namespace unique { namespace-body } 5660 // where all occurrences of 'unique' in a translation unit are 5661 // replaced by the same identifier and this identifier differs 5662 // from all other identifiers in the entire program. 5663 5664 // We just create the namespace with an empty name and then add an 5665 // implicit using declaration, just like the standard suggests. 5666 // 5667 // CodeGen enforces the "universally unique" aspect by giving all 5668 // declarations semantically contained within an anonymous 5669 // namespace internal linkage. 5670 5671 if (!PrevNS) { 5672 UsingDirectiveDecl* UD 5673 = UsingDirectiveDecl::Create(Context, Parent, 5674 /* 'using' */ LBrace, 5675 /* 'namespace' */ SourceLocation(), 5676 /* qualifier */ NestedNameSpecifierLoc(), 5677 /* identifier */ SourceLocation(), 5678 Namespc, 5679 /* Ancestor */ Parent); 5680 UD->setImplicit(); 5681 Parent->addDecl(UD); 5682 } 5683 } 5684 5685 ActOnDocumentableDecl(Namespc); 5686 5687 // Although we could have an invalid decl (i.e. the namespace name is a 5688 // redefinition), push it as current DeclContext and try to continue parsing. 5689 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5690 // for the namespace has the declarations that showed up in that particular 5691 // namespace definition. 5692 PushDeclContext(NamespcScope, Namespc); 5693 return Namespc; 5694} 5695 5696/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5697/// is a namespace alias, returns the namespace it points to. 5698static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5699 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5700 return AD->getNamespace(); 5701 return dyn_cast_or_null<NamespaceDecl>(D); 5702} 5703 5704/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5705/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5706void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5707 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5708 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5709 Namespc->setRBraceLoc(RBrace); 5710 PopDeclContext(); 5711 if (Namespc->hasAttr<VisibilityAttr>()) 5712 PopPragmaVisibility(true, RBrace); 5713} 5714 5715CXXRecordDecl *Sema::getStdBadAlloc() const { 5716 return cast_or_null<CXXRecordDecl>( 5717 StdBadAlloc.get(Context.getExternalSource())); 5718} 5719 5720NamespaceDecl *Sema::getStdNamespace() const { 5721 return cast_or_null<NamespaceDecl>( 5722 StdNamespace.get(Context.getExternalSource())); 5723} 5724 5725/// \brief Retrieve the special "std" namespace, which may require us to 5726/// implicitly define the namespace. 5727NamespaceDecl *Sema::getOrCreateStdNamespace() { 5728 if (!StdNamespace) { 5729 // The "std" namespace has not yet been defined, so build one implicitly. 5730 StdNamespace = NamespaceDecl::Create(Context, 5731 Context.getTranslationUnitDecl(), 5732 /*Inline=*/false, 5733 SourceLocation(), SourceLocation(), 5734 &PP.getIdentifierTable().get("std"), 5735 /*PrevDecl=*/0); 5736 getStdNamespace()->setImplicit(true); 5737 } 5738 5739 return getStdNamespace(); 5740} 5741 5742bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5743 assert(getLangOpts().CPlusPlus && 5744 "Looking for std::initializer_list outside of C++."); 5745 5746 // We're looking for implicit instantiations of 5747 // template <typename E> class std::initializer_list. 5748 5749 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5750 return false; 5751 5752 ClassTemplateDecl *Template = 0; 5753 const TemplateArgument *Arguments = 0; 5754 5755 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5756 5757 ClassTemplateSpecializationDecl *Specialization = 5758 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5759 if (!Specialization) 5760 return false; 5761 5762 Template = Specialization->getSpecializedTemplate(); 5763 Arguments = Specialization->getTemplateArgs().data(); 5764 } else if (const TemplateSpecializationType *TST = 5765 Ty->getAs<TemplateSpecializationType>()) { 5766 Template = dyn_cast_or_null<ClassTemplateDecl>( 5767 TST->getTemplateName().getAsTemplateDecl()); 5768 Arguments = TST->getArgs(); 5769 } 5770 if (!Template) 5771 return false; 5772 5773 if (!StdInitializerList) { 5774 // Haven't recognized std::initializer_list yet, maybe this is it. 5775 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5776 if (TemplateClass->getIdentifier() != 5777 &PP.getIdentifierTable().get("initializer_list") || 5778 !getStdNamespace()->InEnclosingNamespaceSetOf( 5779 TemplateClass->getDeclContext())) 5780 return false; 5781 // This is a template called std::initializer_list, but is it the right 5782 // template? 5783 TemplateParameterList *Params = Template->getTemplateParameters(); 5784 if (Params->getMinRequiredArguments() != 1) 5785 return false; 5786 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5787 return false; 5788 5789 // It's the right template. 5790 StdInitializerList = Template; 5791 } 5792 5793 if (Template != StdInitializerList) 5794 return false; 5795 5796 // This is an instance of std::initializer_list. Find the argument type. 5797 if (Element) 5798 *Element = Arguments[0].getAsType(); 5799 return true; 5800} 5801 5802static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5803 NamespaceDecl *Std = S.getStdNamespace(); 5804 if (!Std) { 5805 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5806 return 0; 5807 } 5808 5809 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5810 Loc, Sema::LookupOrdinaryName); 5811 if (!S.LookupQualifiedName(Result, Std)) { 5812 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5813 return 0; 5814 } 5815 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5816 if (!Template) { 5817 Result.suppressDiagnostics(); 5818 // We found something weird. Complain about the first thing we found. 5819 NamedDecl *Found = *Result.begin(); 5820 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5821 return 0; 5822 } 5823 5824 // We found some template called std::initializer_list. Now verify that it's 5825 // correct. 5826 TemplateParameterList *Params = Template->getTemplateParameters(); 5827 if (Params->getMinRequiredArguments() != 1 || 5828 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5829 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5830 return 0; 5831 } 5832 5833 return Template; 5834} 5835 5836QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5837 if (!StdInitializerList) { 5838 StdInitializerList = LookupStdInitializerList(*this, Loc); 5839 if (!StdInitializerList) 5840 return QualType(); 5841 } 5842 5843 TemplateArgumentListInfo Args(Loc, Loc); 5844 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5845 Context.getTrivialTypeSourceInfo(Element, 5846 Loc))); 5847 return Context.getCanonicalType( 5848 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5849} 5850 5851bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5852 // C++ [dcl.init.list]p2: 5853 // A constructor is an initializer-list constructor if its first parameter 5854 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5855 // std::initializer_list<E> for some type E, and either there are no other 5856 // parameters or else all other parameters have default arguments. 5857 if (Ctor->getNumParams() < 1 || 5858 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5859 return false; 5860 5861 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5862 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5863 ArgType = RT->getPointeeType().getUnqualifiedType(); 5864 5865 return isStdInitializerList(ArgType, 0); 5866} 5867 5868/// \brief Determine whether a using statement is in a context where it will be 5869/// apply in all contexts. 5870static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5871 switch (CurContext->getDeclKind()) { 5872 case Decl::TranslationUnit: 5873 return true; 5874 case Decl::LinkageSpec: 5875 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5876 default: 5877 return false; 5878 } 5879} 5880 5881namespace { 5882 5883// Callback to only accept typo corrections that are namespaces. 5884class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5885 public: 5886 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5887 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5888 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5889 } 5890 return false; 5891 } 5892}; 5893 5894} 5895 5896static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5897 CXXScopeSpec &SS, 5898 SourceLocation IdentLoc, 5899 IdentifierInfo *Ident) { 5900 NamespaceValidatorCCC Validator; 5901 R.clear(); 5902 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5903 R.getLookupKind(), Sc, &SS, 5904 Validator)) { 5905 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 5906 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 5907 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5908 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5909 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5910 << FixItHint::CreateReplacement(Corrected.getCorrectionRange(), 5911 CorrectedStr); 5912 else 5913 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5914 << Ident << CorrectedQuotedStr 5915 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5916 5917 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5918 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5919 5920 R.addDecl(Corrected.getCorrectionDecl()); 5921 return true; 5922 } 5923 return false; 5924} 5925 5926Decl *Sema::ActOnUsingDirective(Scope *S, 5927 SourceLocation UsingLoc, 5928 SourceLocation NamespcLoc, 5929 CXXScopeSpec &SS, 5930 SourceLocation IdentLoc, 5931 IdentifierInfo *NamespcName, 5932 AttributeList *AttrList) { 5933 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5934 assert(NamespcName && "Invalid NamespcName."); 5935 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5936 5937 // This can only happen along a recovery path. 5938 while (S->getFlags() & Scope::TemplateParamScope) 5939 S = S->getParent(); 5940 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5941 5942 UsingDirectiveDecl *UDir = 0; 5943 NestedNameSpecifier *Qualifier = 0; 5944 if (SS.isSet()) 5945 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5946 5947 // Lookup namespace name. 5948 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5949 LookupParsedName(R, S, &SS); 5950 if (R.isAmbiguous()) 5951 return 0; 5952 5953 if (R.empty()) { 5954 R.clear(); 5955 // Allow "using namespace std;" or "using namespace ::std;" even if 5956 // "std" hasn't been defined yet, for GCC compatibility. 5957 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5958 NamespcName->isStr("std")) { 5959 Diag(IdentLoc, diag::ext_using_undefined_std); 5960 R.addDecl(getOrCreateStdNamespace()); 5961 R.resolveKind(); 5962 } 5963 // Otherwise, attempt typo correction. 5964 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5965 } 5966 5967 if (!R.empty()) { 5968 NamedDecl *Named = R.getFoundDecl(); 5969 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5970 && "expected namespace decl"); 5971 // C++ [namespace.udir]p1: 5972 // A using-directive specifies that the names in the nominated 5973 // namespace can be used in the scope in which the 5974 // using-directive appears after the using-directive. During 5975 // unqualified name lookup (3.4.1), the names appear as if they 5976 // were declared in the nearest enclosing namespace which 5977 // contains both the using-directive and the nominated 5978 // namespace. [Note: in this context, "contains" means "contains 5979 // directly or indirectly". ] 5980 5981 // Find enclosing context containing both using-directive and 5982 // nominated namespace. 5983 NamespaceDecl *NS = getNamespaceDecl(Named); 5984 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5985 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5986 CommonAncestor = CommonAncestor->getParent(); 5987 5988 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5989 SS.getWithLocInContext(Context), 5990 IdentLoc, Named, CommonAncestor); 5991 5992 if (IsUsingDirectiveInToplevelContext(CurContext) && 5993 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5994 Diag(IdentLoc, diag::warn_using_directive_in_header); 5995 } 5996 5997 PushUsingDirective(S, UDir); 5998 } else { 5999 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6000 } 6001 6002 // FIXME: We ignore attributes for now. 6003 return UDir; 6004} 6005 6006void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 6007 // If the scope has an associated entity and the using directive is at 6008 // namespace or translation unit scope, add the UsingDirectiveDecl into 6009 // its lookup structure so qualified name lookup can find it. 6010 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 6011 if (Ctx && !Ctx->isFunctionOrMethod()) 6012 Ctx->addDecl(UDir); 6013 else 6014 // Otherwise, it is at block sope. The using-directives will affect lookup 6015 // only to the end of the scope. 6016 S->PushUsingDirective(UDir); 6017} 6018 6019 6020Decl *Sema::ActOnUsingDeclaration(Scope *S, 6021 AccessSpecifier AS, 6022 bool HasUsingKeyword, 6023 SourceLocation UsingLoc, 6024 CXXScopeSpec &SS, 6025 UnqualifiedId &Name, 6026 AttributeList *AttrList, 6027 bool IsTypeName, 6028 SourceLocation TypenameLoc) { 6029 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6030 6031 switch (Name.getKind()) { 6032 case UnqualifiedId::IK_ImplicitSelfParam: 6033 case UnqualifiedId::IK_Identifier: 6034 case UnqualifiedId::IK_OperatorFunctionId: 6035 case UnqualifiedId::IK_LiteralOperatorId: 6036 case UnqualifiedId::IK_ConversionFunctionId: 6037 break; 6038 6039 case UnqualifiedId::IK_ConstructorName: 6040 case UnqualifiedId::IK_ConstructorTemplateId: 6041 // C++11 inheriting constructors. 6042 Diag(Name.getLocStart(), 6043 getLangOpts().CPlusPlus0x ? 6044 // FIXME: Produce warn_cxx98_compat_using_decl_constructor 6045 // instead once inheriting constructors work. 6046 diag::err_using_decl_constructor_unsupported : 6047 diag::err_using_decl_constructor) 6048 << SS.getRange(); 6049 6050 if (getLangOpts().CPlusPlus0x) break; 6051 6052 return 0; 6053 6054 case UnqualifiedId::IK_DestructorName: 6055 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 6056 << SS.getRange(); 6057 return 0; 6058 6059 case UnqualifiedId::IK_TemplateId: 6060 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 6061 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 6062 return 0; 6063 } 6064 6065 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 6066 DeclarationName TargetName = TargetNameInfo.getName(); 6067 if (!TargetName) 6068 return 0; 6069 6070 // Warn about using declarations. 6071 // TODO: store that the declaration was written without 'using' and 6072 // talk about access decls instead of using decls in the 6073 // diagnostics. 6074 if (!HasUsingKeyword) { 6075 UsingLoc = Name.getLocStart(); 6076 6077 Diag(UsingLoc, diag::warn_access_decl_deprecated) 6078 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 6079 } 6080 6081 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 6082 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 6083 return 0; 6084 6085 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 6086 TargetNameInfo, AttrList, 6087 /* IsInstantiation */ false, 6088 IsTypeName, TypenameLoc); 6089 if (UD) 6090 PushOnScopeChains(UD, S, /*AddToContext*/ false); 6091 6092 return UD; 6093} 6094 6095/// \brief Determine whether a using declaration considers the given 6096/// declarations as "equivalent", e.g., if they are redeclarations of 6097/// the same entity or are both typedefs of the same type. 6098static bool 6099IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 6100 bool &SuppressRedeclaration) { 6101 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 6102 SuppressRedeclaration = false; 6103 return true; 6104 } 6105 6106 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 6107 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6108 SuppressRedeclaration = true; 6109 return Context.hasSameType(TD1->getUnderlyingType(), 6110 TD2->getUnderlyingType()); 6111 } 6112 6113 return false; 6114} 6115 6116 6117/// Determines whether to create a using shadow decl for a particular 6118/// decl, given the set of decls existing prior to this using lookup. 6119bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6120 const LookupResult &Previous) { 6121 // Diagnose finding a decl which is not from a base class of the 6122 // current class. We do this now because there are cases where this 6123 // function will silently decide not to build a shadow decl, which 6124 // will pre-empt further diagnostics. 6125 // 6126 // We don't need to do this in C++0x because we do the check once on 6127 // the qualifier. 6128 // 6129 // FIXME: diagnose the following if we care enough: 6130 // struct A { int foo; }; 6131 // struct B : A { using A::foo; }; 6132 // template <class T> struct C : A {}; 6133 // template <class T> struct D : C<T> { using B::foo; } // <--- 6134 // This is invalid (during instantiation) in C++03 because B::foo 6135 // resolves to the using decl in B, which is not a base class of D<T>. 6136 // We can't diagnose it immediately because C<T> is an unknown 6137 // specialization. The UsingShadowDecl in D<T> then points directly 6138 // to A::foo, which will look well-formed when we instantiate. 6139 // The right solution is to not collapse the shadow-decl chain. 6140 if (!getLangOpts().CPlusPlus0x && CurContext->isRecord()) { 6141 DeclContext *OrigDC = Orig->getDeclContext(); 6142 6143 // Handle enums and anonymous structs. 6144 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6145 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6146 while (OrigRec->isAnonymousStructOrUnion()) 6147 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6148 6149 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6150 if (OrigDC == CurContext) { 6151 Diag(Using->getLocation(), 6152 diag::err_using_decl_nested_name_specifier_is_current_class) 6153 << Using->getQualifierLoc().getSourceRange(); 6154 Diag(Orig->getLocation(), diag::note_using_decl_target); 6155 return true; 6156 } 6157 6158 Diag(Using->getQualifierLoc().getBeginLoc(), 6159 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6160 << Using->getQualifier() 6161 << cast<CXXRecordDecl>(CurContext) 6162 << Using->getQualifierLoc().getSourceRange(); 6163 Diag(Orig->getLocation(), diag::note_using_decl_target); 6164 return true; 6165 } 6166 } 6167 6168 if (Previous.empty()) return false; 6169 6170 NamedDecl *Target = Orig; 6171 if (isa<UsingShadowDecl>(Target)) 6172 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6173 6174 // If the target happens to be one of the previous declarations, we 6175 // don't have a conflict. 6176 // 6177 // FIXME: but we might be increasing its access, in which case we 6178 // should redeclare it. 6179 NamedDecl *NonTag = 0, *Tag = 0; 6180 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6181 I != E; ++I) { 6182 NamedDecl *D = (*I)->getUnderlyingDecl(); 6183 bool Result; 6184 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6185 return Result; 6186 6187 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6188 } 6189 6190 if (Target->isFunctionOrFunctionTemplate()) { 6191 FunctionDecl *FD; 6192 if (isa<FunctionTemplateDecl>(Target)) 6193 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6194 else 6195 FD = cast<FunctionDecl>(Target); 6196 6197 NamedDecl *OldDecl = 0; 6198 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6199 case Ovl_Overload: 6200 return false; 6201 6202 case Ovl_NonFunction: 6203 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6204 break; 6205 6206 // We found a decl with the exact signature. 6207 case Ovl_Match: 6208 // If we're in a record, we want to hide the target, so we 6209 // return true (without a diagnostic) to tell the caller not to 6210 // build a shadow decl. 6211 if (CurContext->isRecord()) 6212 return true; 6213 6214 // If we're not in a record, this is an error. 6215 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6216 break; 6217 } 6218 6219 Diag(Target->getLocation(), diag::note_using_decl_target); 6220 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6221 return true; 6222 } 6223 6224 // Target is not a function. 6225 6226 if (isa<TagDecl>(Target)) { 6227 // No conflict between a tag and a non-tag. 6228 if (!Tag) return false; 6229 6230 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6231 Diag(Target->getLocation(), diag::note_using_decl_target); 6232 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6233 return true; 6234 } 6235 6236 // No conflict between a tag and a non-tag. 6237 if (!NonTag) return false; 6238 6239 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6240 Diag(Target->getLocation(), diag::note_using_decl_target); 6241 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6242 return true; 6243} 6244 6245/// Builds a shadow declaration corresponding to a 'using' declaration. 6246UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6247 UsingDecl *UD, 6248 NamedDecl *Orig) { 6249 6250 // If we resolved to another shadow declaration, just coalesce them. 6251 NamedDecl *Target = Orig; 6252 if (isa<UsingShadowDecl>(Target)) { 6253 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6254 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6255 } 6256 6257 UsingShadowDecl *Shadow 6258 = UsingShadowDecl::Create(Context, CurContext, 6259 UD->getLocation(), UD, Target); 6260 UD->addShadowDecl(Shadow); 6261 6262 Shadow->setAccess(UD->getAccess()); 6263 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6264 Shadow->setInvalidDecl(); 6265 6266 if (S) 6267 PushOnScopeChains(Shadow, S); 6268 else 6269 CurContext->addDecl(Shadow); 6270 6271 6272 return Shadow; 6273} 6274 6275/// Hides a using shadow declaration. This is required by the current 6276/// using-decl implementation when a resolvable using declaration in a 6277/// class is followed by a declaration which would hide or override 6278/// one or more of the using decl's targets; for example: 6279/// 6280/// struct Base { void foo(int); }; 6281/// struct Derived : Base { 6282/// using Base::foo; 6283/// void foo(int); 6284/// }; 6285/// 6286/// The governing language is C++03 [namespace.udecl]p12: 6287/// 6288/// When a using-declaration brings names from a base class into a 6289/// derived class scope, member functions in the derived class 6290/// override and/or hide member functions with the same name and 6291/// parameter types in a base class (rather than conflicting). 6292/// 6293/// There are two ways to implement this: 6294/// (1) optimistically create shadow decls when they're not hidden 6295/// by existing declarations, or 6296/// (2) don't create any shadow decls (or at least don't make them 6297/// visible) until we've fully parsed/instantiated the class. 6298/// The problem with (1) is that we might have to retroactively remove 6299/// a shadow decl, which requires several O(n) operations because the 6300/// decl structures are (very reasonably) not designed for removal. 6301/// (2) avoids this but is very fiddly and phase-dependent. 6302void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6303 if (Shadow->getDeclName().getNameKind() == 6304 DeclarationName::CXXConversionFunctionName) 6305 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6306 6307 // Remove it from the DeclContext... 6308 Shadow->getDeclContext()->removeDecl(Shadow); 6309 6310 // ...and the scope, if applicable... 6311 if (S) { 6312 S->RemoveDecl(Shadow); 6313 IdResolver.RemoveDecl(Shadow); 6314 } 6315 6316 // ...and the using decl. 6317 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6318 6319 // TODO: complain somehow if Shadow was used. It shouldn't 6320 // be possible for this to happen, because...? 6321} 6322 6323/// Builds a using declaration. 6324/// 6325/// \param IsInstantiation - Whether this call arises from an 6326/// instantiation of an unresolved using declaration. We treat 6327/// the lookup differently for these declarations. 6328NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6329 SourceLocation UsingLoc, 6330 CXXScopeSpec &SS, 6331 const DeclarationNameInfo &NameInfo, 6332 AttributeList *AttrList, 6333 bool IsInstantiation, 6334 bool IsTypeName, 6335 SourceLocation TypenameLoc) { 6336 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6337 SourceLocation IdentLoc = NameInfo.getLoc(); 6338 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6339 6340 // FIXME: We ignore attributes for now. 6341 6342 if (SS.isEmpty()) { 6343 Diag(IdentLoc, diag::err_using_requires_qualname); 6344 return 0; 6345 } 6346 6347 // Do the redeclaration lookup in the current scope. 6348 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6349 ForRedeclaration); 6350 Previous.setHideTags(false); 6351 if (S) { 6352 LookupName(Previous, S); 6353 6354 // It is really dumb that we have to do this. 6355 LookupResult::Filter F = Previous.makeFilter(); 6356 while (F.hasNext()) { 6357 NamedDecl *D = F.next(); 6358 if (!isDeclInScope(D, CurContext, S)) 6359 F.erase(); 6360 } 6361 F.done(); 6362 } else { 6363 assert(IsInstantiation && "no scope in non-instantiation"); 6364 assert(CurContext->isRecord() && "scope not record in instantiation"); 6365 LookupQualifiedName(Previous, CurContext); 6366 } 6367 6368 // Check for invalid redeclarations. 6369 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6370 return 0; 6371 6372 // Check for bad qualifiers. 6373 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6374 return 0; 6375 6376 DeclContext *LookupContext = computeDeclContext(SS); 6377 NamedDecl *D; 6378 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6379 if (!LookupContext) { 6380 if (IsTypeName) { 6381 // FIXME: not all declaration name kinds are legal here 6382 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6383 UsingLoc, TypenameLoc, 6384 QualifierLoc, 6385 IdentLoc, NameInfo.getName()); 6386 } else { 6387 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6388 QualifierLoc, NameInfo); 6389 } 6390 } else { 6391 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6392 NameInfo, IsTypeName); 6393 } 6394 D->setAccess(AS); 6395 CurContext->addDecl(D); 6396 6397 if (!LookupContext) return D; 6398 UsingDecl *UD = cast<UsingDecl>(D); 6399 6400 if (RequireCompleteDeclContext(SS, LookupContext)) { 6401 UD->setInvalidDecl(); 6402 return UD; 6403 } 6404 6405 // The normal rules do not apply to inheriting constructor declarations. 6406 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6407 if (CheckInheritingConstructorUsingDecl(UD)) 6408 UD->setInvalidDecl(); 6409 return UD; 6410 } 6411 6412 // Otherwise, look up the target name. 6413 6414 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6415 6416 // Unlike most lookups, we don't always want to hide tag 6417 // declarations: tag names are visible through the using declaration 6418 // even if hidden by ordinary names, *except* in a dependent context 6419 // where it's important for the sanity of two-phase lookup. 6420 if (!IsInstantiation) 6421 R.setHideTags(false); 6422 6423 // For the purposes of this lookup, we have a base object type 6424 // equal to that of the current context. 6425 if (CurContext->isRecord()) { 6426 R.setBaseObjectType( 6427 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6428 } 6429 6430 LookupQualifiedName(R, LookupContext); 6431 6432 if (R.empty()) { 6433 Diag(IdentLoc, diag::err_no_member) 6434 << NameInfo.getName() << LookupContext << SS.getRange(); 6435 UD->setInvalidDecl(); 6436 return UD; 6437 } 6438 6439 if (R.isAmbiguous()) { 6440 UD->setInvalidDecl(); 6441 return UD; 6442 } 6443 6444 if (IsTypeName) { 6445 // If we asked for a typename and got a non-type decl, error out. 6446 if (!R.getAsSingle<TypeDecl>()) { 6447 Diag(IdentLoc, diag::err_using_typename_non_type); 6448 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6449 Diag((*I)->getUnderlyingDecl()->getLocation(), 6450 diag::note_using_decl_target); 6451 UD->setInvalidDecl(); 6452 return UD; 6453 } 6454 } else { 6455 // If we asked for a non-typename and we got a type, error out, 6456 // but only if this is an instantiation of an unresolved using 6457 // decl. Otherwise just silently find the type name. 6458 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6459 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6460 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6461 UD->setInvalidDecl(); 6462 return UD; 6463 } 6464 } 6465 6466 // C++0x N2914 [namespace.udecl]p6: 6467 // A using-declaration shall not name a namespace. 6468 if (R.getAsSingle<NamespaceDecl>()) { 6469 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6470 << SS.getRange(); 6471 UD->setInvalidDecl(); 6472 return UD; 6473 } 6474 6475 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6476 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6477 BuildUsingShadowDecl(S, UD, *I); 6478 } 6479 6480 return UD; 6481} 6482 6483/// Additional checks for a using declaration referring to a constructor name. 6484bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6485 assert(!UD->isTypeName() && "expecting a constructor name"); 6486 6487 const Type *SourceType = UD->getQualifier()->getAsType(); 6488 assert(SourceType && 6489 "Using decl naming constructor doesn't have type in scope spec."); 6490 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6491 6492 // Check whether the named type is a direct base class. 6493 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6494 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6495 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6496 BaseIt != BaseE; ++BaseIt) { 6497 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6498 if (CanonicalSourceType == BaseType) 6499 break; 6500 if (BaseIt->getType()->isDependentType()) 6501 break; 6502 } 6503 6504 if (BaseIt == BaseE) { 6505 // Did not find SourceType in the bases. 6506 Diag(UD->getUsingLocation(), 6507 diag::err_using_decl_constructor_not_in_direct_base) 6508 << UD->getNameInfo().getSourceRange() 6509 << QualType(SourceType, 0) << TargetClass; 6510 return true; 6511 } 6512 6513 if (!CurContext->isDependentContext()) 6514 BaseIt->setInheritConstructors(); 6515 6516 return false; 6517} 6518 6519/// Checks that the given using declaration is not an invalid 6520/// redeclaration. Note that this is checking only for the using decl 6521/// itself, not for any ill-formedness among the UsingShadowDecls. 6522bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6523 bool isTypeName, 6524 const CXXScopeSpec &SS, 6525 SourceLocation NameLoc, 6526 const LookupResult &Prev) { 6527 // C++03 [namespace.udecl]p8: 6528 // C++0x [namespace.udecl]p10: 6529 // A using-declaration is a declaration and can therefore be used 6530 // repeatedly where (and only where) multiple declarations are 6531 // allowed. 6532 // 6533 // That's in non-member contexts. 6534 if (!CurContext->getRedeclContext()->isRecord()) 6535 return false; 6536 6537 NestedNameSpecifier *Qual 6538 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6539 6540 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6541 NamedDecl *D = *I; 6542 6543 bool DTypename; 6544 NestedNameSpecifier *DQual; 6545 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6546 DTypename = UD->isTypeName(); 6547 DQual = UD->getQualifier(); 6548 } else if (UnresolvedUsingValueDecl *UD 6549 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6550 DTypename = false; 6551 DQual = UD->getQualifier(); 6552 } else if (UnresolvedUsingTypenameDecl *UD 6553 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6554 DTypename = true; 6555 DQual = UD->getQualifier(); 6556 } else continue; 6557 6558 // using decls differ if one says 'typename' and the other doesn't. 6559 // FIXME: non-dependent using decls? 6560 if (isTypeName != DTypename) continue; 6561 6562 // using decls differ if they name different scopes (but note that 6563 // template instantiation can cause this check to trigger when it 6564 // didn't before instantiation). 6565 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6566 Context.getCanonicalNestedNameSpecifier(DQual)) 6567 continue; 6568 6569 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6570 Diag(D->getLocation(), diag::note_using_decl) << 1; 6571 return true; 6572 } 6573 6574 return false; 6575} 6576 6577 6578/// Checks that the given nested-name qualifier used in a using decl 6579/// in the current context is appropriately related to the current 6580/// scope. If an error is found, diagnoses it and returns true. 6581bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6582 const CXXScopeSpec &SS, 6583 SourceLocation NameLoc) { 6584 DeclContext *NamedContext = computeDeclContext(SS); 6585 6586 if (!CurContext->isRecord()) { 6587 // C++03 [namespace.udecl]p3: 6588 // C++0x [namespace.udecl]p8: 6589 // A using-declaration for a class member shall be a member-declaration. 6590 6591 // If we weren't able to compute a valid scope, it must be a 6592 // dependent class scope. 6593 if (!NamedContext || NamedContext->isRecord()) { 6594 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6595 << SS.getRange(); 6596 return true; 6597 } 6598 6599 // Otherwise, everything is known to be fine. 6600 return false; 6601 } 6602 6603 // The current scope is a record. 6604 6605 // If the named context is dependent, we can't decide much. 6606 if (!NamedContext) { 6607 // FIXME: in C++0x, we can diagnose if we can prove that the 6608 // nested-name-specifier does not refer to a base class, which is 6609 // still possible in some cases. 6610 6611 // Otherwise we have to conservatively report that things might be 6612 // okay. 6613 return false; 6614 } 6615 6616 if (!NamedContext->isRecord()) { 6617 // Ideally this would point at the last name in the specifier, 6618 // but we don't have that level of source info. 6619 Diag(SS.getRange().getBegin(), 6620 diag::err_using_decl_nested_name_specifier_is_not_class) 6621 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6622 return true; 6623 } 6624 6625 if (!NamedContext->isDependentContext() && 6626 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6627 return true; 6628 6629 if (getLangOpts().CPlusPlus0x) { 6630 // C++0x [namespace.udecl]p3: 6631 // In a using-declaration used as a member-declaration, the 6632 // nested-name-specifier shall name a base class of the class 6633 // being defined. 6634 6635 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6636 cast<CXXRecordDecl>(NamedContext))) { 6637 if (CurContext == NamedContext) { 6638 Diag(NameLoc, 6639 diag::err_using_decl_nested_name_specifier_is_current_class) 6640 << SS.getRange(); 6641 return true; 6642 } 6643 6644 Diag(SS.getRange().getBegin(), 6645 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6646 << (NestedNameSpecifier*) SS.getScopeRep() 6647 << cast<CXXRecordDecl>(CurContext) 6648 << SS.getRange(); 6649 return true; 6650 } 6651 6652 return false; 6653 } 6654 6655 // C++03 [namespace.udecl]p4: 6656 // A using-declaration used as a member-declaration shall refer 6657 // to a member of a base class of the class being defined [etc.]. 6658 6659 // Salient point: SS doesn't have to name a base class as long as 6660 // lookup only finds members from base classes. Therefore we can 6661 // diagnose here only if we can prove that that can't happen, 6662 // i.e. if the class hierarchies provably don't intersect. 6663 6664 // TODO: it would be nice if "definitely valid" results were cached 6665 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6666 // need to be repeated. 6667 6668 struct UserData { 6669 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 6670 6671 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6672 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6673 Data->Bases.insert(Base); 6674 return true; 6675 } 6676 6677 bool hasDependentBases(const CXXRecordDecl *Class) { 6678 return !Class->forallBases(collect, this); 6679 } 6680 6681 /// Returns true if the base is dependent or is one of the 6682 /// accumulated base classes. 6683 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6684 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6685 return !Data->Bases.count(Base); 6686 } 6687 6688 bool mightShareBases(const CXXRecordDecl *Class) { 6689 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6690 } 6691 }; 6692 6693 UserData Data; 6694 6695 // Returns false if we find a dependent base. 6696 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6697 return false; 6698 6699 // Returns false if the class has a dependent base or if it or one 6700 // of its bases is present in the base set of the current context. 6701 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6702 return false; 6703 6704 Diag(SS.getRange().getBegin(), 6705 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6706 << (NestedNameSpecifier*) SS.getScopeRep() 6707 << cast<CXXRecordDecl>(CurContext) 6708 << SS.getRange(); 6709 6710 return true; 6711} 6712 6713Decl *Sema::ActOnAliasDeclaration(Scope *S, 6714 AccessSpecifier AS, 6715 MultiTemplateParamsArg TemplateParamLists, 6716 SourceLocation UsingLoc, 6717 UnqualifiedId &Name, 6718 TypeResult Type) { 6719 // Skip up to the relevant declaration scope. 6720 while (S->getFlags() & Scope::TemplateParamScope) 6721 S = S->getParent(); 6722 assert((S->getFlags() & Scope::DeclScope) && 6723 "got alias-declaration outside of declaration scope"); 6724 6725 if (Type.isInvalid()) 6726 return 0; 6727 6728 bool Invalid = false; 6729 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6730 TypeSourceInfo *TInfo = 0; 6731 GetTypeFromParser(Type.get(), &TInfo); 6732 6733 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6734 return 0; 6735 6736 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6737 UPPC_DeclarationType)) { 6738 Invalid = true; 6739 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6740 TInfo->getTypeLoc().getBeginLoc()); 6741 } 6742 6743 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6744 LookupName(Previous, S); 6745 6746 // Warn about shadowing the name of a template parameter. 6747 if (Previous.isSingleResult() && 6748 Previous.getFoundDecl()->isTemplateParameter()) { 6749 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6750 Previous.clear(); 6751 } 6752 6753 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6754 "name in alias declaration must be an identifier"); 6755 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6756 Name.StartLocation, 6757 Name.Identifier, TInfo); 6758 6759 NewTD->setAccess(AS); 6760 6761 if (Invalid) 6762 NewTD->setInvalidDecl(); 6763 6764 CheckTypedefForVariablyModifiedType(S, NewTD); 6765 Invalid |= NewTD->isInvalidDecl(); 6766 6767 bool Redeclaration = false; 6768 6769 NamedDecl *NewND; 6770 if (TemplateParamLists.size()) { 6771 TypeAliasTemplateDecl *OldDecl = 0; 6772 TemplateParameterList *OldTemplateParams = 0; 6773 6774 if (TemplateParamLists.size() != 1) { 6775 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6776 << SourceRange(TemplateParamLists[1]->getTemplateLoc(), 6777 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); 6778 } 6779 TemplateParameterList *TemplateParams = TemplateParamLists[0]; 6780 6781 // Only consider previous declarations in the same scope. 6782 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6783 /*ExplicitInstantiationOrSpecialization*/false); 6784 if (!Previous.empty()) { 6785 Redeclaration = true; 6786 6787 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6788 if (!OldDecl && !Invalid) { 6789 Diag(UsingLoc, diag::err_redefinition_different_kind) 6790 << Name.Identifier; 6791 6792 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6793 if (OldD->getLocation().isValid()) 6794 Diag(OldD->getLocation(), diag::note_previous_definition); 6795 6796 Invalid = true; 6797 } 6798 6799 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6800 if (TemplateParameterListsAreEqual(TemplateParams, 6801 OldDecl->getTemplateParameters(), 6802 /*Complain=*/true, 6803 TPL_TemplateMatch)) 6804 OldTemplateParams = OldDecl->getTemplateParameters(); 6805 else 6806 Invalid = true; 6807 6808 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6809 if (!Invalid && 6810 !Context.hasSameType(OldTD->getUnderlyingType(), 6811 NewTD->getUnderlyingType())) { 6812 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6813 // but we can't reasonably accept it. 6814 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6815 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6816 if (OldTD->getLocation().isValid()) 6817 Diag(OldTD->getLocation(), diag::note_previous_definition); 6818 Invalid = true; 6819 } 6820 } 6821 } 6822 6823 // Merge any previous default template arguments into our parameters, 6824 // and check the parameter list. 6825 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6826 TPC_TypeAliasTemplate)) 6827 return 0; 6828 6829 TypeAliasTemplateDecl *NewDecl = 6830 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6831 Name.Identifier, TemplateParams, 6832 NewTD); 6833 6834 NewDecl->setAccess(AS); 6835 6836 if (Invalid) 6837 NewDecl->setInvalidDecl(); 6838 else if (OldDecl) 6839 NewDecl->setPreviousDeclaration(OldDecl); 6840 6841 NewND = NewDecl; 6842 } else { 6843 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6844 NewND = NewTD; 6845 } 6846 6847 if (!Redeclaration) 6848 PushOnScopeChains(NewND, S); 6849 6850 ActOnDocumentableDecl(NewND); 6851 return NewND; 6852} 6853 6854Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6855 SourceLocation NamespaceLoc, 6856 SourceLocation AliasLoc, 6857 IdentifierInfo *Alias, 6858 CXXScopeSpec &SS, 6859 SourceLocation IdentLoc, 6860 IdentifierInfo *Ident) { 6861 6862 // Lookup the namespace name. 6863 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6864 LookupParsedName(R, S, &SS); 6865 6866 // Check if we have a previous declaration with the same name. 6867 NamedDecl *PrevDecl 6868 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6869 ForRedeclaration); 6870 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6871 PrevDecl = 0; 6872 6873 if (PrevDecl) { 6874 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6875 // We already have an alias with the same name that points to the same 6876 // namespace, so don't create a new one. 6877 // FIXME: At some point, we'll want to create the (redundant) 6878 // declaration to maintain better source information. 6879 if (!R.isAmbiguous() && !R.empty() && 6880 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6881 return 0; 6882 } 6883 6884 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6885 diag::err_redefinition_different_kind; 6886 Diag(AliasLoc, DiagID) << Alias; 6887 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6888 return 0; 6889 } 6890 6891 if (R.isAmbiguous()) 6892 return 0; 6893 6894 if (R.empty()) { 6895 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6896 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6897 return 0; 6898 } 6899 } 6900 6901 NamespaceAliasDecl *AliasDecl = 6902 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6903 Alias, SS.getWithLocInContext(Context), 6904 IdentLoc, R.getFoundDecl()); 6905 6906 PushOnScopeChains(AliasDecl, S); 6907 return AliasDecl; 6908} 6909 6910Sema::ImplicitExceptionSpecification 6911Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 6912 CXXMethodDecl *MD) { 6913 CXXRecordDecl *ClassDecl = MD->getParent(); 6914 6915 // C++ [except.spec]p14: 6916 // An implicitly declared special member function (Clause 12) shall have an 6917 // exception-specification. [...] 6918 ImplicitExceptionSpecification ExceptSpec(*this); 6919 if (ClassDecl->isInvalidDecl()) 6920 return ExceptSpec; 6921 6922 // Direct base-class constructors. 6923 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6924 BEnd = ClassDecl->bases_end(); 6925 B != BEnd; ++B) { 6926 if (B->isVirtual()) // Handled below. 6927 continue; 6928 6929 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6930 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6931 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6932 // If this is a deleted function, add it anyway. This might be conformant 6933 // with the standard. This might not. I'm not sure. It might not matter. 6934 if (Constructor) 6935 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6936 } 6937 } 6938 6939 // Virtual base-class constructors. 6940 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6941 BEnd = ClassDecl->vbases_end(); 6942 B != BEnd; ++B) { 6943 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6944 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6945 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6946 // If this is a deleted function, add it anyway. This might be conformant 6947 // with the standard. This might not. I'm not sure. It might not matter. 6948 if (Constructor) 6949 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6950 } 6951 } 6952 6953 // Field constructors. 6954 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6955 FEnd = ClassDecl->field_end(); 6956 F != FEnd; ++F) { 6957 if (F->hasInClassInitializer()) { 6958 if (Expr *E = F->getInClassInitializer()) 6959 ExceptSpec.CalledExpr(E); 6960 else if (!F->isInvalidDecl()) 6961 // DR1351: 6962 // If the brace-or-equal-initializer of a non-static data member 6963 // invokes a defaulted default constructor of its class or of an 6964 // enclosing class in a potentially evaluated subexpression, the 6965 // program is ill-formed. 6966 // 6967 // This resolution is unworkable: the exception specification of the 6968 // default constructor can be needed in an unevaluated context, in 6969 // particular, in the operand of a noexcept-expression, and we can be 6970 // unable to compute an exception specification for an enclosed class. 6971 // 6972 // We do not allow an in-class initializer to require the evaluation 6973 // of the exception specification for any in-class initializer whose 6974 // definition is not lexically complete. 6975 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 6976 } else if (const RecordType *RecordTy 6977 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6978 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6979 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6980 // If this is a deleted function, add it anyway. This might be conformant 6981 // with the standard. This might not. I'm not sure. It might not matter. 6982 // In particular, the problem is that this function never gets called. It 6983 // might just be ill-formed because this function attempts to refer to 6984 // a deleted function here. 6985 if (Constructor) 6986 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 6987 } 6988 } 6989 6990 return ExceptSpec; 6991} 6992 6993CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6994 CXXRecordDecl *ClassDecl) { 6995 // C++ [class.ctor]p5: 6996 // A default constructor for a class X is a constructor of class X 6997 // that can be called without an argument. If there is no 6998 // user-declared constructor for class X, a default constructor is 6999 // implicitly declared. An implicitly-declared default constructor 7000 // is an inline public member of its class. 7001 assert(ClassDecl->needsImplicitDefaultConstructor() && 7002 "Should not build implicit default constructor!"); 7003 7004 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 7005 CXXDefaultConstructor, 7006 false); 7007 7008 // Create the actual constructor declaration. 7009 CanQualType ClassType 7010 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7011 SourceLocation ClassLoc = ClassDecl->getLocation(); 7012 DeclarationName Name 7013 = Context.DeclarationNames.getCXXConstructorName(ClassType); 7014 DeclarationNameInfo NameInfo(Name, ClassLoc); 7015 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 7016 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 7017 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 7018 Constexpr); 7019 DefaultCon->setAccess(AS_public); 7020 DefaultCon->setDefaulted(); 7021 DefaultCon->setImplicit(); 7022 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 7023 7024 // Build an exception specification pointing back at this constructor. 7025 FunctionProtoType::ExtProtoInfo EPI; 7026 EPI.ExceptionSpecType = EST_Unevaluated; 7027 EPI.ExceptionSpecDecl = DefaultCon; 7028 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7029 7030 // Note that we have declared this constructor. 7031 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 7032 7033 if (Scope *S = getScopeForContext(ClassDecl)) 7034 PushOnScopeChains(DefaultCon, S, false); 7035 ClassDecl->addDecl(DefaultCon); 7036 7037 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 7038 DefaultCon->setDeletedAsWritten(); 7039 7040 return DefaultCon; 7041} 7042 7043void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 7044 CXXConstructorDecl *Constructor) { 7045 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 7046 !Constructor->doesThisDeclarationHaveABody() && 7047 !Constructor->isDeleted()) && 7048 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 7049 7050 CXXRecordDecl *ClassDecl = Constructor->getParent(); 7051 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 7052 7053 SynthesizedFunctionScope Scope(*this, Constructor); 7054 DiagnosticErrorTrap Trap(Diags); 7055 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 7056 Trap.hasErrorOccurred()) { 7057 Diag(CurrentLocation, diag::note_member_synthesized_at) 7058 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 7059 Constructor->setInvalidDecl(); 7060 return; 7061 } 7062 7063 SourceLocation Loc = Constructor->getLocation(); 7064 Constructor->setBody(new (Context) CompoundStmt(Loc)); 7065 7066 Constructor->setUsed(); 7067 MarkVTableUsed(CurrentLocation, ClassDecl); 7068 7069 if (ASTMutationListener *L = getASTMutationListener()) { 7070 L->CompletedImplicitDefinition(Constructor); 7071 } 7072} 7073 7074void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 7075 if (!D) return; 7076 AdjustDeclIfTemplate(D); 7077 7078 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 7079 7080 if (!ClassDecl->isDependentType()) 7081 CheckExplicitlyDefaultedMethods(ClassDecl); 7082} 7083 7084void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 7085 // We start with an initial pass over the base classes to collect those that 7086 // inherit constructors from. If there are none, we can forgo all further 7087 // processing. 7088 typedef SmallVector<const RecordType *, 4> BasesVector; 7089 BasesVector BasesToInheritFrom; 7090 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 7091 BaseE = ClassDecl->bases_end(); 7092 BaseIt != BaseE; ++BaseIt) { 7093 if (BaseIt->getInheritConstructors()) { 7094 QualType Base = BaseIt->getType(); 7095 if (Base->isDependentType()) { 7096 // If we inherit constructors from anything that is dependent, just 7097 // abort processing altogether. We'll get another chance for the 7098 // instantiations. 7099 return; 7100 } 7101 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 7102 } 7103 } 7104 if (BasesToInheritFrom.empty()) 7105 return; 7106 7107 // Now collect the constructors that we already have in the current class. 7108 // Those take precedence over inherited constructors. 7109 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7110 // unless there is a user-declared constructor with the same signature in 7111 // the class where the using-declaration appears. 7112 llvm::SmallSet<const Type *, 8> ExistingConstructors; 7113 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 7114 CtorE = ClassDecl->ctor_end(); 7115 CtorIt != CtorE; ++CtorIt) { 7116 ExistingConstructors.insert( 7117 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 7118 } 7119 7120 DeclarationName CreatedCtorName = 7121 Context.DeclarationNames.getCXXConstructorName( 7122 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 7123 7124 // Now comes the true work. 7125 // First, we keep a map from constructor types to the base that introduced 7126 // them. Needed for finding conflicting constructors. We also keep the 7127 // actually inserted declarations in there, for pretty diagnostics. 7128 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 7129 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 7130 ConstructorToSourceMap InheritedConstructors; 7131 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 7132 BaseE = BasesToInheritFrom.end(); 7133 BaseIt != BaseE; ++BaseIt) { 7134 const RecordType *Base = *BaseIt; 7135 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 7136 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 7137 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 7138 CtorE = BaseDecl->ctor_end(); 7139 CtorIt != CtorE; ++CtorIt) { 7140 // Find the using declaration for inheriting this base's constructors. 7141 // FIXME: Don't perform name lookup just to obtain a source location! 7142 DeclarationName Name = 7143 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7144 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 7145 LookupQualifiedName(Result, CurContext); 7146 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 7147 SourceLocation UsingLoc = UD ? UD->getLocation() : 7148 ClassDecl->getLocation(); 7149 7150 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 7151 // from the class X named in the using-declaration consists of actual 7152 // constructors and notional constructors that result from the 7153 // transformation of defaulted parameters as follows: 7154 // - all non-template default constructors of X, and 7155 // - for each non-template constructor of X that has at least one 7156 // parameter with a default argument, the set of constructors that 7157 // results from omitting any ellipsis parameter specification and 7158 // successively omitting parameters with a default argument from the 7159 // end of the parameter-type-list. 7160 CXXConstructorDecl *BaseCtor = *CtorIt; 7161 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7162 const FunctionProtoType *BaseCtorType = 7163 BaseCtor->getType()->getAs<FunctionProtoType>(); 7164 7165 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7166 maxParams = BaseCtor->getNumParams(); 7167 params <= maxParams; ++params) { 7168 // Skip default constructors. They're never inherited. 7169 if (params == 0) 7170 continue; 7171 // Skip copy and move constructors for the same reason. 7172 if (CanBeCopyOrMove && params == 1) 7173 continue; 7174 7175 // Build up a function type for this particular constructor. 7176 // FIXME: The working paper does not consider that the exception spec 7177 // for the inheriting constructor might be larger than that of the 7178 // source. This code doesn't yet, either. When it does, this code will 7179 // need to be delayed until after exception specifications and in-class 7180 // member initializers are attached. 7181 const Type *NewCtorType; 7182 if (params == maxParams) 7183 NewCtorType = BaseCtorType; 7184 else { 7185 SmallVector<QualType, 16> Args; 7186 for (unsigned i = 0; i < params; ++i) { 7187 Args.push_back(BaseCtorType->getArgType(i)); 7188 } 7189 FunctionProtoType::ExtProtoInfo ExtInfo = 7190 BaseCtorType->getExtProtoInfo(); 7191 ExtInfo.Variadic = false; 7192 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7193 Args.data(), params, ExtInfo) 7194 .getTypePtr(); 7195 } 7196 const Type *CanonicalNewCtorType = 7197 Context.getCanonicalType(NewCtorType); 7198 7199 // Now that we have the type, first check if the class already has a 7200 // constructor with this signature. 7201 if (ExistingConstructors.count(CanonicalNewCtorType)) 7202 continue; 7203 7204 // Then we check if we have already declared an inherited constructor 7205 // with this signature. 7206 std::pair<ConstructorToSourceMap::iterator, bool> result = 7207 InheritedConstructors.insert(std::make_pair( 7208 CanonicalNewCtorType, 7209 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7210 if (!result.second) { 7211 // Already in the map. If it came from a different class, that's an 7212 // error. Not if it's from the same. 7213 CanQualType PreviousBase = result.first->second.first; 7214 if (CanonicalBase != PreviousBase) { 7215 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7216 const CXXConstructorDecl *PrevBaseCtor = 7217 PrevCtor->getInheritedConstructor(); 7218 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7219 7220 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7221 Diag(BaseCtor->getLocation(), 7222 diag::note_using_decl_constructor_conflict_current_ctor); 7223 Diag(PrevBaseCtor->getLocation(), 7224 diag::note_using_decl_constructor_conflict_previous_ctor); 7225 Diag(PrevCtor->getLocation(), 7226 diag::note_using_decl_constructor_conflict_previous_using); 7227 } 7228 continue; 7229 } 7230 7231 // OK, we're there, now add the constructor. 7232 // C++0x [class.inhctor]p8: [...] that would be performed by a 7233 // user-written inline constructor [...] 7234 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7235 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7236 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7237 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7238 /*ImplicitlyDeclared=*/true, 7239 // FIXME: Due to a defect in the standard, we treat inherited 7240 // constructors as constexpr even if that makes them ill-formed. 7241 /*Constexpr=*/BaseCtor->isConstexpr()); 7242 NewCtor->setAccess(BaseCtor->getAccess()); 7243 7244 // Build up the parameter decls and add them. 7245 SmallVector<ParmVarDecl *, 16> ParamDecls; 7246 for (unsigned i = 0; i < params; ++i) { 7247 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7248 UsingLoc, UsingLoc, 7249 /*IdentifierInfo=*/0, 7250 BaseCtorType->getArgType(i), 7251 /*TInfo=*/0, SC_None, 7252 SC_None, /*DefaultArg=*/0)); 7253 } 7254 NewCtor->setParams(ParamDecls); 7255 NewCtor->setInheritedConstructor(BaseCtor); 7256 7257 ClassDecl->addDecl(NewCtor); 7258 result.first->second.second = NewCtor; 7259 } 7260 } 7261 } 7262} 7263 7264Sema::ImplicitExceptionSpecification 7265Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 7266 CXXRecordDecl *ClassDecl = MD->getParent(); 7267 7268 // C++ [except.spec]p14: 7269 // An implicitly declared special member function (Clause 12) shall have 7270 // an exception-specification. 7271 ImplicitExceptionSpecification ExceptSpec(*this); 7272 if (ClassDecl->isInvalidDecl()) 7273 return ExceptSpec; 7274 7275 // Direct base-class destructors. 7276 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7277 BEnd = ClassDecl->bases_end(); 7278 B != BEnd; ++B) { 7279 if (B->isVirtual()) // Handled below. 7280 continue; 7281 7282 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7283 ExceptSpec.CalledDecl(B->getLocStart(), 7284 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7285 } 7286 7287 // Virtual base-class destructors. 7288 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7289 BEnd = ClassDecl->vbases_end(); 7290 B != BEnd; ++B) { 7291 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7292 ExceptSpec.CalledDecl(B->getLocStart(), 7293 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7294 } 7295 7296 // Field destructors. 7297 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7298 FEnd = ClassDecl->field_end(); 7299 F != FEnd; ++F) { 7300 if (const RecordType *RecordTy 7301 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7302 ExceptSpec.CalledDecl(F->getLocation(), 7303 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7304 } 7305 7306 return ExceptSpec; 7307} 7308 7309CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7310 // C++ [class.dtor]p2: 7311 // If a class has no user-declared destructor, a destructor is 7312 // declared implicitly. An implicitly-declared destructor is an 7313 // inline public member of its class. 7314 assert(!ClassDecl->hasDeclaredDestructor()); 7315 7316 // Create the actual destructor declaration. 7317 CanQualType ClassType 7318 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7319 SourceLocation ClassLoc = ClassDecl->getLocation(); 7320 DeclarationName Name 7321 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7322 DeclarationNameInfo NameInfo(Name, ClassLoc); 7323 CXXDestructorDecl *Destructor 7324 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7325 QualType(), 0, /*isInline=*/true, 7326 /*isImplicitlyDeclared=*/true); 7327 Destructor->setAccess(AS_public); 7328 Destructor->setDefaulted(); 7329 Destructor->setImplicit(); 7330 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7331 7332 // Build an exception specification pointing back at this destructor. 7333 FunctionProtoType::ExtProtoInfo EPI; 7334 EPI.ExceptionSpecType = EST_Unevaluated; 7335 EPI.ExceptionSpecDecl = Destructor; 7336 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7337 7338 // Note that we have declared this destructor. 7339 ++ASTContext::NumImplicitDestructorsDeclared; 7340 7341 // Introduce this destructor into its scope. 7342 if (Scope *S = getScopeForContext(ClassDecl)) 7343 PushOnScopeChains(Destructor, S, false); 7344 ClassDecl->addDecl(Destructor); 7345 7346 AddOverriddenMethods(ClassDecl, Destructor); 7347 7348 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7349 Destructor->setDeletedAsWritten(); 7350 7351 return Destructor; 7352} 7353 7354void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7355 CXXDestructorDecl *Destructor) { 7356 assert((Destructor->isDefaulted() && 7357 !Destructor->doesThisDeclarationHaveABody() && 7358 !Destructor->isDeleted()) && 7359 "DefineImplicitDestructor - call it for implicit default dtor"); 7360 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7361 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7362 7363 if (Destructor->isInvalidDecl()) 7364 return; 7365 7366 SynthesizedFunctionScope Scope(*this, Destructor); 7367 7368 DiagnosticErrorTrap Trap(Diags); 7369 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7370 Destructor->getParent()); 7371 7372 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7373 Diag(CurrentLocation, diag::note_member_synthesized_at) 7374 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7375 7376 Destructor->setInvalidDecl(); 7377 return; 7378 } 7379 7380 SourceLocation Loc = Destructor->getLocation(); 7381 Destructor->setBody(new (Context) CompoundStmt(Loc)); 7382 Destructor->setImplicitlyDefined(true); 7383 Destructor->setUsed(); 7384 MarkVTableUsed(CurrentLocation, ClassDecl); 7385 7386 if (ASTMutationListener *L = getASTMutationListener()) { 7387 L->CompletedImplicitDefinition(Destructor); 7388 } 7389} 7390 7391/// \brief Perform any semantic analysis which needs to be delayed until all 7392/// pending class member declarations have been parsed. 7393void Sema::ActOnFinishCXXMemberDecls() { 7394 // Perform any deferred checking of exception specifications for virtual 7395 // destructors. 7396 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 7397 i != e; ++i) { 7398 const CXXDestructorDecl *Dtor = 7399 DelayedDestructorExceptionSpecChecks[i].first; 7400 assert(!Dtor->getParent()->isDependentType() && 7401 "Should not ever add destructors of templates into the list."); 7402 CheckOverridingFunctionExceptionSpec(Dtor, 7403 DelayedDestructorExceptionSpecChecks[i].second); 7404 } 7405 DelayedDestructorExceptionSpecChecks.clear(); 7406} 7407 7408void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 7409 CXXDestructorDecl *Destructor) { 7410 assert(getLangOpts().CPlusPlus0x && 7411 "adjusting dtor exception specs was introduced in c++11"); 7412 7413 // C++11 [class.dtor]p3: 7414 // A declaration of a destructor that does not have an exception- 7415 // specification is implicitly considered to have the same exception- 7416 // specification as an implicit declaration. 7417 const FunctionProtoType *DtorType = Destructor->getType()-> 7418 getAs<FunctionProtoType>(); 7419 if (DtorType->hasExceptionSpec()) 7420 return; 7421 7422 // Replace the destructor's type, building off the existing one. Fortunately, 7423 // the only thing of interest in the destructor type is its extended info. 7424 // The return and arguments are fixed. 7425 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 7426 EPI.ExceptionSpecType = EST_Unevaluated; 7427 EPI.ExceptionSpecDecl = Destructor; 7428 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7429 7430 // FIXME: If the destructor has a body that could throw, and the newly created 7431 // spec doesn't allow exceptions, we should emit a warning, because this 7432 // change in behavior can break conforming C++03 programs at runtime. 7433 // However, we don't have a body or an exception specification yet, so it 7434 // needs to be done somewhere else. 7435} 7436 7437/// When generating a defaulted copy or move assignment operator, if a field 7438/// should be copied with __builtin_memcpy rather than via explicit assignments, 7439/// do so. This optimization only applies for arrays of scalars, and for arrays 7440/// of class type where the selected copy/move-assignment operator is trivial. 7441static StmtResult 7442buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T, 7443 Expr *To, Expr *From) { 7444 // Compute the size of the memory buffer to be copied. 7445 QualType SizeType = S.Context.getSizeType(); 7446 llvm::APInt Size(S.Context.getTypeSize(SizeType), 7447 S.Context.getTypeSizeInChars(T).getQuantity()); 7448 7449 // Take the address of the field references for "from" and "to". We 7450 // directly construct UnaryOperators here because semantic analysis 7451 // does not permit us to take the address of an xvalue. 7452 From = new (S.Context) UnaryOperator(From, UO_AddrOf, 7453 S.Context.getPointerType(From->getType()), 7454 VK_RValue, OK_Ordinary, Loc); 7455 To = new (S.Context) UnaryOperator(To, UO_AddrOf, 7456 S.Context.getPointerType(To->getType()), 7457 VK_RValue, OK_Ordinary, Loc); 7458 7459 const Type *E = T->getBaseElementTypeUnsafe(); 7460 bool NeedsCollectableMemCpy = 7461 E->isRecordType() && E->getAs<RecordType>()->getDecl()->hasObjectMember(); 7462 7463 // Create a reference to the __builtin_objc_memmove_collectable function 7464 StringRef MemCpyName = NeedsCollectableMemCpy ? 7465 "__builtin_objc_memmove_collectable" : 7466 "__builtin_memcpy"; 7467 LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc, 7468 Sema::LookupOrdinaryName); 7469 S.LookupName(R, S.TUScope, true); 7470 7471 FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>(); 7472 if (!MemCpy) 7473 // Something went horribly wrong earlier, and we will have complained 7474 // about it. 7475 return StmtError(); 7476 7477 ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy, 7478 VK_RValue, Loc, 0); 7479 assert(MemCpyRef.isUsable() && "Builtin reference cannot fail"); 7480 7481 Expr *CallArgs[] = { 7482 To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc) 7483 }; 7484 ExprResult Call = S.ActOnCallExpr(/*Scope=*/0, MemCpyRef.take(), 7485 Loc, CallArgs, Loc); 7486 7487 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7488 return S.Owned(Call.takeAs<Stmt>()); 7489} 7490 7491/// \brief Builds a statement that copies/moves the given entity from \p From to 7492/// \c To. 7493/// 7494/// This routine is used to copy/move the members of a class with an 7495/// implicitly-declared copy/move assignment operator. When the entities being 7496/// copied are arrays, this routine builds for loops to copy them. 7497/// 7498/// \param S The Sema object used for type-checking. 7499/// 7500/// \param Loc The location where the implicit copy/move is being generated. 7501/// 7502/// \param T The type of the expressions being copied/moved. Both expressions 7503/// must have this type. 7504/// 7505/// \param To The expression we are copying/moving to. 7506/// 7507/// \param From The expression we are copying/moving from. 7508/// 7509/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7510/// Otherwise, it's a non-static member subobject. 7511/// 7512/// \param Copying Whether we're copying or moving. 7513/// 7514/// \param Depth Internal parameter recording the depth of the recursion. 7515/// 7516/// \returns A statement or a loop that copies the expressions, or StmtResult(0) 7517/// if a memcpy should be used instead. 7518static StmtResult 7519buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T, 7520 Expr *To, Expr *From, 7521 bool CopyingBaseSubobject, bool Copying, 7522 unsigned Depth = 0) { 7523 // C++11 [class.copy]p28: 7524 // Each subobject is assigned in the manner appropriate to its type: 7525 // 7526 // - if the subobject is of class type, as if by a call to operator= with 7527 // the subobject as the object expression and the corresponding 7528 // subobject of x as a single function argument (as if by explicit 7529 // qualification; that is, ignoring any possible virtual overriding 7530 // functions in more derived classes); 7531 // 7532 // C++03 [class.copy]p13: 7533 // - if the subobject is of class type, the copy assignment operator for 7534 // the class is used (as if by explicit qualification; that is, 7535 // ignoring any possible virtual overriding functions in more derived 7536 // classes); 7537 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7538 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7539 7540 // Look for operator=. 7541 DeclarationName Name 7542 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7543 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7544 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7545 7546 // Prior to C++11, filter out any result that isn't a copy/move-assignment 7547 // operator. 7548 if (!S.getLangOpts().CPlusPlus0x) { 7549 LookupResult::Filter F = OpLookup.makeFilter(); 7550 while (F.hasNext()) { 7551 NamedDecl *D = F.next(); 7552 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7553 if (Method->isCopyAssignmentOperator() || 7554 (!Copying && Method->isMoveAssignmentOperator())) 7555 continue; 7556 7557 F.erase(); 7558 } 7559 F.done(); 7560 } 7561 7562 // Suppress the protected check (C++ [class.protected]) for each of the 7563 // assignment operators we found. This strange dance is required when 7564 // we're assigning via a base classes's copy-assignment operator. To 7565 // ensure that we're getting the right base class subobject (without 7566 // ambiguities), we need to cast "this" to that subobject type; to 7567 // ensure that we don't go through the virtual call mechanism, we need 7568 // to qualify the operator= name with the base class (see below). However, 7569 // this means that if the base class has a protected copy assignment 7570 // operator, the protected member access check will fail. So, we 7571 // rewrite "protected" access to "public" access in this case, since we 7572 // know by construction that we're calling from a derived class. 7573 if (CopyingBaseSubobject) { 7574 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7575 L != LEnd; ++L) { 7576 if (L.getAccess() == AS_protected) 7577 L.setAccess(AS_public); 7578 } 7579 } 7580 7581 // Create the nested-name-specifier that will be used to qualify the 7582 // reference to operator=; this is required to suppress the virtual 7583 // call mechanism. 7584 CXXScopeSpec SS; 7585 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7586 SS.MakeTrivial(S.Context, 7587 NestedNameSpecifier::Create(S.Context, 0, false, 7588 CanonicalT), 7589 Loc); 7590 7591 // Create the reference to operator=. 7592 ExprResult OpEqualRef 7593 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7594 /*TemplateKWLoc=*/SourceLocation(), 7595 /*FirstQualifierInScope=*/0, 7596 OpLookup, 7597 /*TemplateArgs=*/0, 7598 /*SuppressQualifierCheck=*/true); 7599 if (OpEqualRef.isInvalid()) 7600 return StmtError(); 7601 7602 // Build the call to the assignment operator. 7603 7604 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7605 OpEqualRef.takeAs<Expr>(), 7606 Loc, &From, 1, Loc); 7607 if (Call.isInvalid()) 7608 return StmtError(); 7609 7610 // If we built a call to a trivial 'operator=' while copying an array, 7611 // bail out. We'll replace the whole shebang with a memcpy. 7612 CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get()); 7613 if (CE && CE->getMethodDecl()->isTrivial() && Depth) 7614 return StmtResult((Stmt*)0); 7615 7616 // Convert to an expression-statement, and clean up any produced 7617 // temporaries. 7618 return S.ActOnExprStmt(S.MakeFullExpr(Call.take(), Loc)); 7619 } 7620 7621 // - if the subobject is of scalar type, the built-in assignment 7622 // operator is used. 7623 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7624 if (!ArrayTy) { 7625 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7626 if (Assignment.isInvalid()) 7627 return StmtError(); 7628 return S.ActOnExprStmt(S.MakeFullExpr(Assignment.take(), Loc)); 7629 } 7630 7631 // - if the subobject is an array, each element is assigned, in the 7632 // manner appropriate to the element type; 7633 7634 // Construct a loop over the array bounds, e.g., 7635 // 7636 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7637 // 7638 // that will copy each of the array elements. 7639 QualType SizeType = S.Context.getSizeType(); 7640 7641 // Create the iteration variable. 7642 IdentifierInfo *IterationVarName = 0; 7643 { 7644 SmallString<8> Str; 7645 llvm::raw_svector_ostream OS(Str); 7646 OS << "__i" << Depth; 7647 IterationVarName = &S.Context.Idents.get(OS.str()); 7648 } 7649 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7650 IterationVarName, SizeType, 7651 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7652 SC_None, SC_None); 7653 7654 // Initialize the iteration variable to zero. 7655 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7656 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7657 7658 // Create a reference to the iteration variable; we'll use this several 7659 // times throughout. 7660 Expr *IterationVarRef 7661 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7662 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7663 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7664 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7665 7666 // Create the DeclStmt that holds the iteration variable. 7667 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7668 7669 // Subscript the "from" and "to" expressions with the iteration variable. 7670 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7671 IterationVarRefRVal, 7672 Loc)); 7673 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7674 IterationVarRefRVal, 7675 Loc)); 7676 if (!Copying) // Cast to rvalue 7677 From = CastForMoving(S, From); 7678 7679 // Build the copy/move for an individual element of the array. 7680 StmtResult Copy = 7681 buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(), 7682 To, From, CopyingBaseSubobject, 7683 Copying, Depth + 1); 7684 // Bail out if copying fails or if we determined that we should use memcpy. 7685 if (Copy.isInvalid() || !Copy.get()) 7686 return Copy; 7687 7688 // Create the comparison against the array bound. 7689 llvm::APInt Upper 7690 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7691 Expr *Comparison 7692 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7693 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7694 BO_NE, S.Context.BoolTy, 7695 VK_RValue, OK_Ordinary, Loc, false); 7696 7697 // Create the pre-increment of the iteration variable. 7698 Expr *Increment 7699 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7700 VK_LValue, OK_Ordinary, Loc); 7701 7702 // Construct the loop that copies all elements of this array. 7703 return S.ActOnForStmt(Loc, Loc, InitStmt, 7704 S.MakeFullExpr(Comparison), 7705 0, S.MakeFullExpr(Increment), 7706 Loc, Copy.take()); 7707} 7708 7709static StmtResult 7710buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7711 Expr *To, Expr *From, 7712 bool CopyingBaseSubobject, bool Copying) { 7713 // Maybe we should use a memcpy? 7714 if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() && 7715 T.isTriviallyCopyableType(S.Context)) 7716 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 7717 7718 StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From, 7719 CopyingBaseSubobject, 7720 Copying, 0)); 7721 7722 // If we ended up picking a trivial assignment operator for an array of a 7723 // non-trivially-copyable class type, just emit a memcpy. 7724 if (!Result.isInvalid() && !Result.get()) 7725 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 7726 7727 return Result; 7728} 7729 7730/// Determine whether an implicit copy assignment operator for ClassDecl has a 7731/// const argument. 7732/// FIXME: It ought to be possible to store this on the record. 7733static bool isImplicitCopyAssignmentArgConst(Sema &S, 7734 CXXRecordDecl *ClassDecl) { 7735 if (ClassDecl->isInvalidDecl()) 7736 return true; 7737 7738 // C++ [class.copy]p10: 7739 // If the class definition does not explicitly declare a copy 7740 // assignment operator, one is declared implicitly. 7741 // The implicitly-defined copy assignment operator for a class X 7742 // will have the form 7743 // 7744 // X& X::operator=(const X&) 7745 // 7746 // if 7747 // -- each direct base class B of X has a copy assignment operator 7748 // whose parameter is of type const B&, const volatile B& or B, 7749 // and 7750 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7751 BaseEnd = ClassDecl->bases_end(); 7752 Base != BaseEnd; ++Base) { 7753 // We'll handle this below 7754 if (S.getLangOpts().CPlusPlus0x && Base->isVirtual()) 7755 continue; 7756 7757 assert(!Base->getType()->isDependentType() && 7758 "Cannot generate implicit members for class with dependent bases."); 7759 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7760 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0)) 7761 return false; 7762 } 7763 7764 // In C++11, the above citation has "or virtual" added 7765 if (S.getLangOpts().CPlusPlus0x) { 7766 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7767 BaseEnd = ClassDecl->vbases_end(); 7768 Base != BaseEnd; ++Base) { 7769 assert(!Base->getType()->isDependentType() && 7770 "Cannot generate implicit members for class with dependent bases."); 7771 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7772 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7773 false, 0)) 7774 return false; 7775 } 7776 } 7777 7778 // -- for all the nonstatic data members of X that are of a class 7779 // type M (or array thereof), each such class type has a copy 7780 // assignment operator whose parameter is of type const M&, 7781 // const volatile M& or M. 7782 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7783 FieldEnd = ClassDecl->field_end(); 7784 Field != FieldEnd; ++Field) { 7785 QualType FieldType = S.Context.getBaseElementType(Field->getType()); 7786 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) 7787 if (!S.LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, 7788 false, 0)) 7789 return false; 7790 } 7791 7792 // Otherwise, the implicitly declared copy assignment operator will 7793 // have the form 7794 // 7795 // X& X::operator=(X&) 7796 7797 return true; 7798} 7799 7800Sema::ImplicitExceptionSpecification 7801Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 7802 CXXRecordDecl *ClassDecl = MD->getParent(); 7803 7804 ImplicitExceptionSpecification ExceptSpec(*this); 7805 if (ClassDecl->isInvalidDecl()) 7806 return ExceptSpec; 7807 7808 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 7809 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 7810 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 7811 7812 // C++ [except.spec]p14: 7813 // An implicitly declared special member function (Clause 12) shall have an 7814 // exception-specification. [...] 7815 7816 // It is unspecified whether or not an implicit copy assignment operator 7817 // attempts to deduplicate calls to assignment operators of virtual bases are 7818 // made. As such, this exception specification is effectively unspecified. 7819 // Based on a similar decision made for constness in C++0x, we're erring on 7820 // the side of assuming such calls to be made regardless of whether they 7821 // actually happen. 7822 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7823 BaseEnd = ClassDecl->bases_end(); 7824 Base != BaseEnd; ++Base) { 7825 if (Base->isVirtual()) 7826 continue; 7827 7828 CXXRecordDecl *BaseClassDecl 7829 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7830 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7831 ArgQuals, false, 0)) 7832 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7833 } 7834 7835 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7836 BaseEnd = ClassDecl->vbases_end(); 7837 Base != BaseEnd; ++Base) { 7838 CXXRecordDecl *BaseClassDecl 7839 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7840 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7841 ArgQuals, false, 0)) 7842 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7843 } 7844 7845 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7846 FieldEnd = ClassDecl->field_end(); 7847 Field != FieldEnd; 7848 ++Field) { 7849 QualType FieldType = Context.getBaseElementType(Field->getType()); 7850 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7851 if (CXXMethodDecl *CopyAssign = 7852 LookupCopyingAssignment(FieldClassDecl, 7853 ArgQuals | FieldType.getCVRQualifiers(), 7854 false, 0)) 7855 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 7856 } 7857 } 7858 7859 return ExceptSpec; 7860} 7861 7862CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7863 // Note: The following rules are largely analoguous to the copy 7864 // constructor rules. Note that virtual bases are not taken into account 7865 // for determining the argument type of the operator. Note also that 7866 // operators taking an object instead of a reference are allowed. 7867 assert(!ClassDecl->hasDeclaredCopyAssignment()); 7868 7869 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7870 QualType RetType = Context.getLValueReferenceType(ArgType); 7871 if (isImplicitCopyAssignmentArgConst(*this, ClassDecl)) 7872 ArgType = ArgType.withConst(); 7873 ArgType = Context.getLValueReferenceType(ArgType); 7874 7875 // An implicitly-declared copy assignment operator is an inline public 7876 // member of its class. 7877 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7878 SourceLocation ClassLoc = ClassDecl->getLocation(); 7879 DeclarationNameInfo NameInfo(Name, ClassLoc); 7880 CXXMethodDecl *CopyAssignment 7881 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 7882 /*TInfo=*/0, /*isStatic=*/false, 7883 /*StorageClassAsWritten=*/SC_None, 7884 /*isInline=*/true, /*isConstexpr=*/false, 7885 SourceLocation()); 7886 CopyAssignment->setAccess(AS_public); 7887 CopyAssignment->setDefaulted(); 7888 CopyAssignment->setImplicit(); 7889 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7890 7891 // Build an exception specification pointing back at this member. 7892 FunctionProtoType::ExtProtoInfo EPI; 7893 EPI.ExceptionSpecType = EST_Unevaluated; 7894 EPI.ExceptionSpecDecl = CopyAssignment; 7895 CopyAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 7896 7897 // Add the parameter to the operator. 7898 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7899 ClassLoc, ClassLoc, /*Id=*/0, 7900 ArgType, /*TInfo=*/0, 7901 SC_None, 7902 SC_None, 0); 7903 CopyAssignment->setParams(FromParam); 7904 7905 // Note that we have added this copy-assignment operator. 7906 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7907 7908 if (Scope *S = getScopeForContext(ClassDecl)) 7909 PushOnScopeChains(CopyAssignment, S, false); 7910 ClassDecl->addDecl(CopyAssignment); 7911 7912 // C++0x [class.copy]p19: 7913 // .... If the class definition does not explicitly declare a copy 7914 // assignment operator, there is no user-declared move constructor, and 7915 // there is no user-declared move assignment operator, a copy assignment 7916 // operator is implicitly declared as defaulted. 7917 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7918 CopyAssignment->setDeletedAsWritten(); 7919 7920 AddOverriddenMethods(ClassDecl, CopyAssignment); 7921 return CopyAssignment; 7922} 7923 7924void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7925 CXXMethodDecl *CopyAssignOperator) { 7926 assert((CopyAssignOperator->isDefaulted() && 7927 CopyAssignOperator->isOverloadedOperator() && 7928 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7929 !CopyAssignOperator->doesThisDeclarationHaveABody() && 7930 !CopyAssignOperator->isDeleted()) && 7931 "DefineImplicitCopyAssignment called for wrong function"); 7932 7933 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7934 7935 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7936 CopyAssignOperator->setInvalidDecl(); 7937 return; 7938 } 7939 7940 CopyAssignOperator->setUsed(); 7941 7942 SynthesizedFunctionScope Scope(*this, CopyAssignOperator); 7943 DiagnosticErrorTrap Trap(Diags); 7944 7945 // C++0x [class.copy]p30: 7946 // The implicitly-defined or explicitly-defaulted copy assignment operator 7947 // for a non-union class X performs memberwise copy assignment of its 7948 // subobjects. The direct base classes of X are assigned first, in the 7949 // order of their declaration in the base-specifier-list, and then the 7950 // immediate non-static data members of X are assigned, in the order in 7951 // which they were declared in the class definition. 7952 7953 // The statements that form the synthesized function body. 7954 SmallVector<Stmt*, 8> Statements; 7955 7956 // The parameter for the "other" object, which we are copying from. 7957 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7958 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7959 QualType OtherRefType = Other->getType(); 7960 if (const LValueReferenceType *OtherRef 7961 = OtherRefType->getAs<LValueReferenceType>()) { 7962 OtherRefType = OtherRef->getPointeeType(); 7963 OtherQuals = OtherRefType.getQualifiers(); 7964 } 7965 7966 // Our location for everything implicitly-generated. 7967 SourceLocation Loc = CopyAssignOperator->getLocation(); 7968 7969 // Construct a reference to the "other" object. We'll be using this 7970 // throughout the generated ASTs. 7971 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7972 assert(OtherRef && "Reference to parameter cannot fail!"); 7973 7974 // Construct the "this" pointer. We'll be using this throughout the generated 7975 // ASTs. 7976 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7977 assert(This && "Reference to this cannot fail!"); 7978 7979 // Assign base classes. 7980 bool Invalid = false; 7981 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7982 E = ClassDecl->bases_end(); Base != E; ++Base) { 7983 // Form the assignment: 7984 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7985 QualType BaseType = Base->getType().getUnqualifiedType(); 7986 if (!BaseType->isRecordType()) { 7987 Invalid = true; 7988 continue; 7989 } 7990 7991 CXXCastPath BasePath; 7992 BasePath.push_back(Base); 7993 7994 // Construct the "from" expression, which is an implicit cast to the 7995 // appropriately-qualified base type. 7996 Expr *From = OtherRef; 7997 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7998 CK_UncheckedDerivedToBase, 7999 VK_LValue, &BasePath).take(); 8000 8001 // Dereference "this". 8002 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8003 8004 // Implicitly cast "this" to the appropriately-qualified base type. 8005 To = ImpCastExprToType(To.take(), 8006 Context.getCVRQualifiedType(BaseType, 8007 CopyAssignOperator->getTypeQualifiers()), 8008 CK_UncheckedDerivedToBase, 8009 VK_LValue, &BasePath); 8010 8011 // Build the copy. 8012 StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType, 8013 To.get(), From, 8014 /*CopyingBaseSubobject=*/true, 8015 /*Copying=*/true); 8016 if (Copy.isInvalid()) { 8017 Diag(CurrentLocation, diag::note_member_synthesized_at) 8018 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8019 CopyAssignOperator->setInvalidDecl(); 8020 return; 8021 } 8022 8023 // Success! Record the copy. 8024 Statements.push_back(Copy.takeAs<Expr>()); 8025 } 8026 8027 // Assign non-static members. 8028 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8029 FieldEnd = ClassDecl->field_end(); 8030 Field != FieldEnd; ++Field) { 8031 if (Field->isUnnamedBitfield()) 8032 continue; 8033 8034 // Check for members of reference type; we can't copy those. 8035 if (Field->getType()->isReferenceType()) { 8036 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8037 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8038 Diag(Field->getLocation(), diag::note_declared_at); 8039 Diag(CurrentLocation, diag::note_member_synthesized_at) 8040 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8041 Invalid = true; 8042 continue; 8043 } 8044 8045 // Check for members of const-qualified, non-class type. 8046 QualType BaseType = Context.getBaseElementType(Field->getType()); 8047 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8048 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8049 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8050 Diag(Field->getLocation(), diag::note_declared_at); 8051 Diag(CurrentLocation, diag::note_member_synthesized_at) 8052 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8053 Invalid = true; 8054 continue; 8055 } 8056 8057 // Suppress assigning zero-width bitfields. 8058 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8059 continue; 8060 8061 QualType FieldType = Field->getType().getNonReferenceType(); 8062 if (FieldType->isIncompleteArrayType()) { 8063 assert(ClassDecl->hasFlexibleArrayMember() && 8064 "Incomplete array type is not valid"); 8065 continue; 8066 } 8067 8068 // Build references to the field in the object we're copying from and to. 8069 CXXScopeSpec SS; // Intentionally empty 8070 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8071 LookupMemberName); 8072 MemberLookup.addDecl(*Field); 8073 MemberLookup.resolveKind(); 8074 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8075 Loc, /*IsArrow=*/false, 8076 SS, SourceLocation(), 0, 8077 MemberLookup, 0); 8078 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8079 Loc, /*IsArrow=*/true, 8080 SS, SourceLocation(), 0, 8081 MemberLookup, 0); 8082 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8083 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8084 8085 // Build the copy of this field. 8086 StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType, 8087 To.get(), From.get(), 8088 /*CopyingBaseSubobject=*/false, 8089 /*Copying=*/true); 8090 if (Copy.isInvalid()) { 8091 Diag(CurrentLocation, diag::note_member_synthesized_at) 8092 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8093 CopyAssignOperator->setInvalidDecl(); 8094 return; 8095 } 8096 8097 // Success! Record the copy. 8098 Statements.push_back(Copy.takeAs<Stmt>()); 8099 } 8100 8101 if (!Invalid) { 8102 // Add a "return *this;" 8103 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8104 8105 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8106 if (Return.isInvalid()) 8107 Invalid = true; 8108 else { 8109 Statements.push_back(Return.takeAs<Stmt>()); 8110 8111 if (Trap.hasErrorOccurred()) { 8112 Diag(CurrentLocation, diag::note_member_synthesized_at) 8113 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8114 Invalid = true; 8115 } 8116 } 8117 } 8118 8119 if (Invalid) { 8120 CopyAssignOperator->setInvalidDecl(); 8121 return; 8122 } 8123 8124 StmtResult Body; 8125 { 8126 CompoundScopeRAII CompoundScope(*this); 8127 Body = ActOnCompoundStmt(Loc, Loc, Statements, 8128 /*isStmtExpr=*/false); 8129 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8130 } 8131 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 8132 8133 if (ASTMutationListener *L = getASTMutationListener()) { 8134 L->CompletedImplicitDefinition(CopyAssignOperator); 8135 } 8136} 8137 8138Sema::ImplicitExceptionSpecification 8139Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 8140 CXXRecordDecl *ClassDecl = MD->getParent(); 8141 8142 ImplicitExceptionSpecification ExceptSpec(*this); 8143 if (ClassDecl->isInvalidDecl()) 8144 return ExceptSpec; 8145 8146 // C++0x [except.spec]p14: 8147 // An implicitly declared special member function (Clause 12) shall have an 8148 // exception-specification. [...] 8149 8150 // It is unspecified whether or not an implicit move assignment operator 8151 // attempts to deduplicate calls to assignment operators of virtual bases are 8152 // made. As such, this exception specification is effectively unspecified. 8153 // Based on a similar decision made for constness in C++0x, we're erring on 8154 // the side of assuming such calls to be made regardless of whether they 8155 // actually happen. 8156 // Note that a move constructor is not implicitly declared when there are 8157 // virtual bases, but it can still be user-declared and explicitly defaulted. 8158 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8159 BaseEnd = ClassDecl->bases_end(); 8160 Base != BaseEnd; ++Base) { 8161 if (Base->isVirtual()) 8162 continue; 8163 8164 CXXRecordDecl *BaseClassDecl 8165 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8166 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8167 0, false, 0)) 8168 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8169 } 8170 8171 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8172 BaseEnd = ClassDecl->vbases_end(); 8173 Base != BaseEnd; ++Base) { 8174 CXXRecordDecl *BaseClassDecl 8175 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8176 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8177 0, false, 0)) 8178 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8179 } 8180 8181 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8182 FieldEnd = ClassDecl->field_end(); 8183 Field != FieldEnd; 8184 ++Field) { 8185 QualType FieldType = Context.getBaseElementType(Field->getType()); 8186 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8187 if (CXXMethodDecl *MoveAssign = 8188 LookupMovingAssignment(FieldClassDecl, 8189 FieldType.getCVRQualifiers(), 8190 false, 0)) 8191 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 8192 } 8193 } 8194 8195 return ExceptSpec; 8196} 8197 8198/// Determine whether the class type has any direct or indirect virtual base 8199/// classes which have a non-trivial move assignment operator. 8200static bool 8201hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 8202 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8203 BaseEnd = ClassDecl->vbases_end(); 8204 Base != BaseEnd; ++Base) { 8205 CXXRecordDecl *BaseClass = 8206 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8207 8208 // Try to declare the move assignment. If it would be deleted, then the 8209 // class does not have a non-trivial move assignment. 8210 if (BaseClass->needsImplicitMoveAssignment()) 8211 S.DeclareImplicitMoveAssignment(BaseClass); 8212 8213 if (BaseClass->hasNonTrivialMoveAssignment()) 8214 return true; 8215 } 8216 8217 return false; 8218} 8219 8220/// Determine whether the given type either has a move constructor or is 8221/// trivially copyable. 8222static bool 8223hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8224 Type = S.Context.getBaseElementType(Type); 8225 8226 // FIXME: Technically, non-trivially-copyable non-class types, such as 8227 // reference types, are supposed to return false here, but that appears 8228 // to be a standard defect. 8229 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8230 if (!ClassDecl || !ClassDecl->getDefinition() || ClassDecl->isInvalidDecl()) 8231 return true; 8232 8233 if (Type.isTriviallyCopyableType(S.Context)) 8234 return true; 8235 8236 if (IsConstructor) { 8237 if (ClassDecl->needsImplicitMoveConstructor()) 8238 S.DeclareImplicitMoveConstructor(ClassDecl); 8239 return ClassDecl->hasDeclaredMoveConstructor(); 8240 } 8241 8242 if (ClassDecl->needsImplicitMoveAssignment()) 8243 S.DeclareImplicitMoveAssignment(ClassDecl); 8244 return ClassDecl->hasDeclaredMoveAssignment(); 8245} 8246 8247/// Determine whether all non-static data members and direct or virtual bases 8248/// of class \p ClassDecl have either a move operation, or are trivially 8249/// copyable. 8250static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8251 bool IsConstructor) { 8252 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8253 BaseEnd = ClassDecl->bases_end(); 8254 Base != BaseEnd; ++Base) { 8255 if (Base->isVirtual()) 8256 continue; 8257 8258 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8259 return false; 8260 } 8261 8262 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8263 BaseEnd = ClassDecl->vbases_end(); 8264 Base != BaseEnd; ++Base) { 8265 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8266 return false; 8267 } 8268 8269 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8270 FieldEnd = ClassDecl->field_end(); 8271 Field != FieldEnd; ++Field) { 8272 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 8273 return false; 8274 } 8275 8276 return true; 8277} 8278 8279CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8280 // C++11 [class.copy]p20: 8281 // If the definition of a class X does not explicitly declare a move 8282 // assignment operator, one will be implicitly declared as defaulted 8283 // if and only if: 8284 // 8285 // - [first 4 bullets] 8286 assert(ClassDecl->needsImplicitMoveAssignment()); 8287 8288 // [Checked after we build the declaration] 8289 // - the move assignment operator would not be implicitly defined as 8290 // deleted, 8291 8292 // [DR1402]: 8293 // - X has no direct or indirect virtual base class with a non-trivial 8294 // move assignment operator, and 8295 // - each of X's non-static data members and direct or virtual base classes 8296 // has a type that either has a move assignment operator or is trivially 8297 // copyable. 8298 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8299 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8300 ClassDecl->setFailedImplicitMoveAssignment(); 8301 return 0; 8302 } 8303 8304 // Note: The following rules are largely analoguous to the move 8305 // constructor rules. 8306 8307 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8308 QualType RetType = Context.getLValueReferenceType(ArgType); 8309 ArgType = Context.getRValueReferenceType(ArgType); 8310 8311 // An implicitly-declared move assignment operator is an inline public 8312 // member of its class. 8313 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8314 SourceLocation ClassLoc = ClassDecl->getLocation(); 8315 DeclarationNameInfo NameInfo(Name, ClassLoc); 8316 CXXMethodDecl *MoveAssignment 8317 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8318 /*TInfo=*/0, /*isStatic=*/false, 8319 /*StorageClassAsWritten=*/SC_None, 8320 /*isInline=*/true, 8321 /*isConstexpr=*/false, 8322 SourceLocation()); 8323 MoveAssignment->setAccess(AS_public); 8324 MoveAssignment->setDefaulted(); 8325 MoveAssignment->setImplicit(); 8326 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8327 8328 // Build an exception specification pointing back at this member. 8329 FunctionProtoType::ExtProtoInfo EPI; 8330 EPI.ExceptionSpecType = EST_Unevaluated; 8331 EPI.ExceptionSpecDecl = MoveAssignment; 8332 MoveAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 8333 8334 // Add the parameter to the operator. 8335 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8336 ClassLoc, ClassLoc, /*Id=*/0, 8337 ArgType, /*TInfo=*/0, 8338 SC_None, 8339 SC_None, 0); 8340 MoveAssignment->setParams(FromParam); 8341 8342 // Note that we have added this copy-assignment operator. 8343 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8344 8345 // C++0x [class.copy]p9: 8346 // If the definition of a class X does not explicitly declare a move 8347 // assignment operator, one will be implicitly declared as defaulted if and 8348 // only if: 8349 // [...] 8350 // - the move assignment operator would not be implicitly defined as 8351 // deleted. 8352 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8353 // Cache this result so that we don't try to generate this over and over 8354 // on every lookup, leaking memory and wasting time. 8355 ClassDecl->setFailedImplicitMoveAssignment(); 8356 return 0; 8357 } 8358 8359 if (Scope *S = getScopeForContext(ClassDecl)) 8360 PushOnScopeChains(MoveAssignment, S, false); 8361 ClassDecl->addDecl(MoveAssignment); 8362 8363 AddOverriddenMethods(ClassDecl, MoveAssignment); 8364 return MoveAssignment; 8365} 8366 8367void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8368 CXXMethodDecl *MoveAssignOperator) { 8369 assert((MoveAssignOperator->isDefaulted() && 8370 MoveAssignOperator->isOverloadedOperator() && 8371 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8372 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8373 !MoveAssignOperator->isDeleted()) && 8374 "DefineImplicitMoveAssignment called for wrong function"); 8375 8376 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8377 8378 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8379 MoveAssignOperator->setInvalidDecl(); 8380 return; 8381 } 8382 8383 MoveAssignOperator->setUsed(); 8384 8385 SynthesizedFunctionScope Scope(*this, MoveAssignOperator); 8386 DiagnosticErrorTrap Trap(Diags); 8387 8388 // C++0x [class.copy]p28: 8389 // The implicitly-defined or move assignment operator for a non-union class 8390 // X performs memberwise move assignment of its subobjects. The direct base 8391 // classes of X are assigned first, in the order of their declaration in the 8392 // base-specifier-list, and then the immediate non-static data members of X 8393 // are assigned, in the order in which they were declared in the class 8394 // definition. 8395 8396 // The statements that form the synthesized function body. 8397 SmallVector<Stmt*, 8> Statements; 8398 8399 // The parameter for the "other" object, which we are move from. 8400 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8401 QualType OtherRefType = Other->getType()-> 8402 getAs<RValueReferenceType>()->getPointeeType(); 8403 assert(OtherRefType.getQualifiers() == 0 && 8404 "Bad argument type of defaulted move assignment"); 8405 8406 // Our location for everything implicitly-generated. 8407 SourceLocation Loc = MoveAssignOperator->getLocation(); 8408 8409 // Construct a reference to the "other" object. We'll be using this 8410 // throughout the generated ASTs. 8411 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8412 assert(OtherRef && "Reference to parameter cannot fail!"); 8413 // Cast to rvalue. 8414 OtherRef = CastForMoving(*this, OtherRef); 8415 8416 // Construct the "this" pointer. We'll be using this throughout the generated 8417 // ASTs. 8418 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8419 assert(This && "Reference to this cannot fail!"); 8420 8421 // Assign base classes. 8422 bool Invalid = false; 8423 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8424 E = ClassDecl->bases_end(); Base != E; ++Base) { 8425 // Form the assignment: 8426 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8427 QualType BaseType = Base->getType().getUnqualifiedType(); 8428 if (!BaseType->isRecordType()) { 8429 Invalid = true; 8430 continue; 8431 } 8432 8433 CXXCastPath BasePath; 8434 BasePath.push_back(Base); 8435 8436 // Construct the "from" expression, which is an implicit cast to the 8437 // appropriately-qualified base type. 8438 Expr *From = OtherRef; 8439 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8440 VK_XValue, &BasePath).take(); 8441 8442 // Dereference "this". 8443 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8444 8445 // Implicitly cast "this" to the appropriately-qualified base type. 8446 To = ImpCastExprToType(To.take(), 8447 Context.getCVRQualifiedType(BaseType, 8448 MoveAssignOperator->getTypeQualifiers()), 8449 CK_UncheckedDerivedToBase, 8450 VK_LValue, &BasePath); 8451 8452 // Build the move. 8453 StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType, 8454 To.get(), From, 8455 /*CopyingBaseSubobject=*/true, 8456 /*Copying=*/false); 8457 if (Move.isInvalid()) { 8458 Diag(CurrentLocation, diag::note_member_synthesized_at) 8459 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8460 MoveAssignOperator->setInvalidDecl(); 8461 return; 8462 } 8463 8464 // Success! Record the move. 8465 Statements.push_back(Move.takeAs<Expr>()); 8466 } 8467 8468 // Assign non-static members. 8469 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8470 FieldEnd = ClassDecl->field_end(); 8471 Field != FieldEnd; ++Field) { 8472 if (Field->isUnnamedBitfield()) 8473 continue; 8474 8475 // Check for members of reference type; we can't move those. 8476 if (Field->getType()->isReferenceType()) { 8477 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8478 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8479 Diag(Field->getLocation(), diag::note_declared_at); 8480 Diag(CurrentLocation, diag::note_member_synthesized_at) 8481 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8482 Invalid = true; 8483 continue; 8484 } 8485 8486 // Check for members of const-qualified, non-class type. 8487 QualType BaseType = Context.getBaseElementType(Field->getType()); 8488 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8489 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8490 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8491 Diag(Field->getLocation(), diag::note_declared_at); 8492 Diag(CurrentLocation, diag::note_member_synthesized_at) 8493 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8494 Invalid = true; 8495 continue; 8496 } 8497 8498 // Suppress assigning zero-width bitfields. 8499 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8500 continue; 8501 8502 QualType FieldType = Field->getType().getNonReferenceType(); 8503 if (FieldType->isIncompleteArrayType()) { 8504 assert(ClassDecl->hasFlexibleArrayMember() && 8505 "Incomplete array type is not valid"); 8506 continue; 8507 } 8508 8509 // Build references to the field in the object we're copying from and to. 8510 CXXScopeSpec SS; // Intentionally empty 8511 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8512 LookupMemberName); 8513 MemberLookup.addDecl(*Field); 8514 MemberLookup.resolveKind(); 8515 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8516 Loc, /*IsArrow=*/false, 8517 SS, SourceLocation(), 0, 8518 MemberLookup, 0); 8519 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8520 Loc, /*IsArrow=*/true, 8521 SS, SourceLocation(), 0, 8522 MemberLookup, 0); 8523 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8524 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8525 8526 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8527 "Member reference with rvalue base must be rvalue except for reference " 8528 "members, which aren't allowed for move assignment."); 8529 8530 // Build the move of this field. 8531 StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType, 8532 To.get(), From.get(), 8533 /*CopyingBaseSubobject=*/false, 8534 /*Copying=*/false); 8535 if (Move.isInvalid()) { 8536 Diag(CurrentLocation, diag::note_member_synthesized_at) 8537 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8538 MoveAssignOperator->setInvalidDecl(); 8539 return; 8540 } 8541 8542 // Success! Record the copy. 8543 Statements.push_back(Move.takeAs<Stmt>()); 8544 } 8545 8546 if (!Invalid) { 8547 // Add a "return *this;" 8548 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8549 8550 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8551 if (Return.isInvalid()) 8552 Invalid = true; 8553 else { 8554 Statements.push_back(Return.takeAs<Stmt>()); 8555 8556 if (Trap.hasErrorOccurred()) { 8557 Diag(CurrentLocation, diag::note_member_synthesized_at) 8558 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8559 Invalid = true; 8560 } 8561 } 8562 } 8563 8564 if (Invalid) { 8565 MoveAssignOperator->setInvalidDecl(); 8566 return; 8567 } 8568 8569 StmtResult Body; 8570 { 8571 CompoundScopeRAII CompoundScope(*this); 8572 Body = ActOnCompoundStmt(Loc, Loc, Statements, 8573 /*isStmtExpr=*/false); 8574 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8575 } 8576 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8577 8578 if (ASTMutationListener *L = getASTMutationListener()) { 8579 L->CompletedImplicitDefinition(MoveAssignOperator); 8580 } 8581} 8582 8583/// Determine whether an implicit copy constructor for ClassDecl has a const 8584/// argument. 8585/// FIXME: It ought to be possible to store this on the record. 8586static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl) { 8587 if (ClassDecl->isInvalidDecl()) 8588 return true; 8589 8590 // C++ [class.copy]p5: 8591 // The implicitly-declared copy constructor for a class X will 8592 // have the form 8593 // 8594 // X::X(const X&) 8595 // 8596 // if 8597 // -- each direct or virtual base class B of X has a copy 8598 // constructor whose first parameter is of type const B& or 8599 // const volatile B&, and 8600 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8601 BaseEnd = ClassDecl->bases_end(); 8602 Base != BaseEnd; ++Base) { 8603 // Virtual bases are handled below. 8604 if (Base->isVirtual()) 8605 continue; 8606 8607 CXXRecordDecl *BaseClassDecl 8608 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8609 // FIXME: This lookup is wrong. If the copy ctor for a member or base is 8610 // ambiguous, we should still produce a constructor with a const-qualified 8611 // parameter. 8612 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const)) 8613 return false; 8614 } 8615 8616 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8617 BaseEnd = ClassDecl->vbases_end(); 8618 Base != BaseEnd; ++Base) { 8619 CXXRecordDecl *BaseClassDecl 8620 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8621 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const)) 8622 return false; 8623 } 8624 8625 // -- for all the nonstatic data members of X that are of a 8626 // class type M (or array thereof), each such class type 8627 // has a copy constructor whose first parameter is of type 8628 // const M& or const volatile M&. 8629 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8630 FieldEnd = ClassDecl->field_end(); 8631 Field != FieldEnd; ++Field) { 8632 QualType FieldType = S.Context.getBaseElementType(Field->getType()); 8633 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8634 if (!S.LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const)) 8635 return false; 8636 } 8637 } 8638 8639 // Otherwise, the implicitly declared copy constructor will have 8640 // the form 8641 // 8642 // X::X(X&) 8643 8644 return true; 8645} 8646 8647Sema::ImplicitExceptionSpecification 8648Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 8649 CXXRecordDecl *ClassDecl = MD->getParent(); 8650 8651 ImplicitExceptionSpecification ExceptSpec(*this); 8652 if (ClassDecl->isInvalidDecl()) 8653 return ExceptSpec; 8654 8655 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 8656 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 8657 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 8658 8659 // C++ [except.spec]p14: 8660 // An implicitly declared special member function (Clause 12) shall have an 8661 // exception-specification. [...] 8662 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8663 BaseEnd = ClassDecl->bases_end(); 8664 Base != BaseEnd; 8665 ++Base) { 8666 // Virtual bases are handled below. 8667 if (Base->isVirtual()) 8668 continue; 8669 8670 CXXRecordDecl *BaseClassDecl 8671 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8672 if (CXXConstructorDecl *CopyConstructor = 8673 LookupCopyingConstructor(BaseClassDecl, Quals)) 8674 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8675 } 8676 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8677 BaseEnd = ClassDecl->vbases_end(); 8678 Base != BaseEnd; 8679 ++Base) { 8680 CXXRecordDecl *BaseClassDecl 8681 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8682 if (CXXConstructorDecl *CopyConstructor = 8683 LookupCopyingConstructor(BaseClassDecl, Quals)) 8684 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8685 } 8686 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8687 FieldEnd = ClassDecl->field_end(); 8688 Field != FieldEnd; 8689 ++Field) { 8690 QualType FieldType = Context.getBaseElementType(Field->getType()); 8691 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8692 if (CXXConstructorDecl *CopyConstructor = 8693 LookupCopyingConstructor(FieldClassDecl, 8694 Quals | FieldType.getCVRQualifiers())) 8695 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 8696 } 8697 } 8698 8699 return ExceptSpec; 8700} 8701 8702CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8703 CXXRecordDecl *ClassDecl) { 8704 // C++ [class.copy]p4: 8705 // If the class definition does not explicitly declare a copy 8706 // constructor, one is declared implicitly. 8707 assert(!ClassDecl->hasDeclaredCopyConstructor()); 8708 8709 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8710 QualType ArgType = ClassType; 8711 bool Const = isImplicitCopyCtorArgConst(*this, ClassDecl); 8712 if (Const) 8713 ArgType = ArgType.withConst(); 8714 ArgType = Context.getLValueReferenceType(ArgType); 8715 8716 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8717 CXXCopyConstructor, 8718 Const); 8719 8720 DeclarationName Name 8721 = Context.DeclarationNames.getCXXConstructorName( 8722 Context.getCanonicalType(ClassType)); 8723 SourceLocation ClassLoc = ClassDecl->getLocation(); 8724 DeclarationNameInfo NameInfo(Name, ClassLoc); 8725 8726 // An implicitly-declared copy constructor is an inline public 8727 // member of its class. 8728 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8729 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 8730 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8731 Constexpr); 8732 CopyConstructor->setAccess(AS_public); 8733 CopyConstructor->setDefaulted(); 8734 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8735 8736 // Build an exception specification pointing back at this member. 8737 FunctionProtoType::ExtProtoInfo EPI; 8738 EPI.ExceptionSpecType = EST_Unevaluated; 8739 EPI.ExceptionSpecDecl = CopyConstructor; 8740 CopyConstructor->setType( 8741 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 8742 8743 // Note that we have declared this constructor. 8744 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8745 8746 // Add the parameter to the constructor. 8747 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8748 ClassLoc, ClassLoc, 8749 /*IdentifierInfo=*/0, 8750 ArgType, /*TInfo=*/0, 8751 SC_None, 8752 SC_None, 0); 8753 CopyConstructor->setParams(FromParam); 8754 8755 if (Scope *S = getScopeForContext(ClassDecl)) 8756 PushOnScopeChains(CopyConstructor, S, false); 8757 ClassDecl->addDecl(CopyConstructor); 8758 8759 // C++11 [class.copy]p8: 8760 // ... If the class definition does not explicitly declare a copy 8761 // constructor, there is no user-declared move constructor, and there is no 8762 // user-declared move assignment operator, a copy constructor is implicitly 8763 // declared as defaulted. 8764 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8765 CopyConstructor->setDeletedAsWritten(); 8766 8767 return CopyConstructor; 8768} 8769 8770void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8771 CXXConstructorDecl *CopyConstructor) { 8772 assert((CopyConstructor->isDefaulted() && 8773 CopyConstructor->isCopyConstructor() && 8774 !CopyConstructor->doesThisDeclarationHaveABody() && 8775 !CopyConstructor->isDeleted()) && 8776 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8777 8778 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8779 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8780 8781 SynthesizedFunctionScope Scope(*this, CopyConstructor); 8782 DiagnosticErrorTrap Trap(Diags); 8783 8784 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8785 Trap.hasErrorOccurred()) { 8786 Diag(CurrentLocation, diag::note_member_synthesized_at) 8787 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8788 CopyConstructor->setInvalidDecl(); 8789 } else { 8790 Sema::CompoundScopeRAII CompoundScope(*this); 8791 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8792 CopyConstructor->getLocation(), 8793 MultiStmtArg(), 8794 /*isStmtExpr=*/false) 8795 .takeAs<Stmt>()); 8796 CopyConstructor->setImplicitlyDefined(true); 8797 } 8798 8799 CopyConstructor->setUsed(); 8800 if (ASTMutationListener *L = getASTMutationListener()) { 8801 L->CompletedImplicitDefinition(CopyConstructor); 8802 } 8803} 8804 8805Sema::ImplicitExceptionSpecification 8806Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 8807 CXXRecordDecl *ClassDecl = MD->getParent(); 8808 8809 // C++ [except.spec]p14: 8810 // An implicitly declared special member function (Clause 12) shall have an 8811 // exception-specification. [...] 8812 ImplicitExceptionSpecification ExceptSpec(*this); 8813 if (ClassDecl->isInvalidDecl()) 8814 return ExceptSpec; 8815 8816 // Direct base-class constructors. 8817 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8818 BEnd = ClassDecl->bases_end(); 8819 B != BEnd; ++B) { 8820 if (B->isVirtual()) // Handled below. 8821 continue; 8822 8823 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8824 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8825 CXXConstructorDecl *Constructor = 8826 LookupMovingConstructor(BaseClassDecl, 0); 8827 // If this is a deleted function, add it anyway. This might be conformant 8828 // with the standard. This might not. I'm not sure. It might not matter. 8829 if (Constructor) 8830 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8831 } 8832 } 8833 8834 // Virtual base-class constructors. 8835 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8836 BEnd = ClassDecl->vbases_end(); 8837 B != BEnd; ++B) { 8838 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8839 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8840 CXXConstructorDecl *Constructor = 8841 LookupMovingConstructor(BaseClassDecl, 0); 8842 // If this is a deleted function, add it anyway. This might be conformant 8843 // with the standard. This might not. I'm not sure. It might not matter. 8844 if (Constructor) 8845 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8846 } 8847 } 8848 8849 // Field constructors. 8850 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8851 FEnd = ClassDecl->field_end(); 8852 F != FEnd; ++F) { 8853 QualType FieldType = Context.getBaseElementType(F->getType()); 8854 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 8855 CXXConstructorDecl *Constructor = 8856 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 8857 // If this is a deleted function, add it anyway. This might be conformant 8858 // with the standard. This might not. I'm not sure. It might not matter. 8859 // In particular, the problem is that this function never gets called. It 8860 // might just be ill-formed because this function attempts to refer to 8861 // a deleted function here. 8862 if (Constructor) 8863 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 8864 } 8865 } 8866 8867 return ExceptSpec; 8868} 8869 8870CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8871 CXXRecordDecl *ClassDecl) { 8872 // C++11 [class.copy]p9: 8873 // If the definition of a class X does not explicitly declare a move 8874 // constructor, one will be implicitly declared as defaulted if and only if: 8875 // 8876 // - [first 4 bullets] 8877 assert(ClassDecl->needsImplicitMoveConstructor()); 8878 8879 // [Checked after we build the declaration] 8880 // - the move assignment operator would not be implicitly defined as 8881 // deleted, 8882 8883 // [DR1402]: 8884 // - each of X's non-static data members and direct or virtual base classes 8885 // has a type that either has a move constructor or is trivially copyable. 8886 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 8887 ClassDecl->setFailedImplicitMoveConstructor(); 8888 return 0; 8889 } 8890 8891 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8892 QualType ArgType = Context.getRValueReferenceType(ClassType); 8893 8894 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8895 CXXMoveConstructor, 8896 false); 8897 8898 DeclarationName Name 8899 = Context.DeclarationNames.getCXXConstructorName( 8900 Context.getCanonicalType(ClassType)); 8901 SourceLocation ClassLoc = ClassDecl->getLocation(); 8902 DeclarationNameInfo NameInfo(Name, ClassLoc); 8903 8904 // C++0x [class.copy]p11: 8905 // An implicitly-declared copy/move constructor is an inline public 8906 // member of its class. 8907 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8908 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 8909 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8910 Constexpr); 8911 MoveConstructor->setAccess(AS_public); 8912 MoveConstructor->setDefaulted(); 8913 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8914 8915 // Build an exception specification pointing back at this member. 8916 FunctionProtoType::ExtProtoInfo EPI; 8917 EPI.ExceptionSpecType = EST_Unevaluated; 8918 EPI.ExceptionSpecDecl = MoveConstructor; 8919 MoveConstructor->setType( 8920 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 8921 8922 // Add the parameter to the constructor. 8923 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8924 ClassLoc, ClassLoc, 8925 /*IdentifierInfo=*/0, 8926 ArgType, /*TInfo=*/0, 8927 SC_None, 8928 SC_None, 0); 8929 MoveConstructor->setParams(FromParam); 8930 8931 // C++0x [class.copy]p9: 8932 // If the definition of a class X does not explicitly declare a move 8933 // constructor, one will be implicitly declared as defaulted if and only if: 8934 // [...] 8935 // - the move constructor would not be implicitly defined as deleted. 8936 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8937 // Cache this result so that we don't try to generate this over and over 8938 // on every lookup, leaking memory and wasting time. 8939 ClassDecl->setFailedImplicitMoveConstructor(); 8940 return 0; 8941 } 8942 8943 // Note that we have declared this constructor. 8944 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8945 8946 if (Scope *S = getScopeForContext(ClassDecl)) 8947 PushOnScopeChains(MoveConstructor, S, false); 8948 ClassDecl->addDecl(MoveConstructor); 8949 8950 return MoveConstructor; 8951} 8952 8953void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8954 CXXConstructorDecl *MoveConstructor) { 8955 assert((MoveConstructor->isDefaulted() && 8956 MoveConstructor->isMoveConstructor() && 8957 !MoveConstructor->doesThisDeclarationHaveABody() && 8958 !MoveConstructor->isDeleted()) && 8959 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8960 8961 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8962 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8963 8964 SynthesizedFunctionScope Scope(*this, MoveConstructor); 8965 DiagnosticErrorTrap Trap(Diags); 8966 8967 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8968 Trap.hasErrorOccurred()) { 8969 Diag(CurrentLocation, diag::note_member_synthesized_at) 8970 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8971 MoveConstructor->setInvalidDecl(); 8972 } else { 8973 Sema::CompoundScopeRAII CompoundScope(*this); 8974 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8975 MoveConstructor->getLocation(), 8976 MultiStmtArg(), 8977 /*isStmtExpr=*/false) 8978 .takeAs<Stmt>()); 8979 MoveConstructor->setImplicitlyDefined(true); 8980 } 8981 8982 MoveConstructor->setUsed(); 8983 8984 if (ASTMutationListener *L = getASTMutationListener()) { 8985 L->CompletedImplicitDefinition(MoveConstructor); 8986 } 8987} 8988 8989bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 8990 return FD->isDeleted() && 8991 (FD->isDefaulted() || FD->isImplicit()) && 8992 isa<CXXMethodDecl>(FD); 8993} 8994 8995/// \brief Mark the call operator of the given lambda closure type as "used". 8996static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 8997 CXXMethodDecl *CallOperator 8998 = cast<CXXMethodDecl>( 8999 *Lambda->lookup( 9000 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 9001 CallOperator->setReferenced(); 9002 CallOperator->setUsed(); 9003} 9004 9005void Sema::DefineImplicitLambdaToFunctionPointerConversion( 9006 SourceLocation CurrentLocation, 9007 CXXConversionDecl *Conv) 9008{ 9009 CXXRecordDecl *Lambda = Conv->getParent(); 9010 9011 // Make sure that the lambda call operator is marked used. 9012 markLambdaCallOperatorUsed(*this, Lambda); 9013 9014 Conv->setUsed(); 9015 9016 SynthesizedFunctionScope Scope(*this, Conv); 9017 DiagnosticErrorTrap Trap(Diags); 9018 9019 // Return the address of the __invoke function. 9020 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 9021 CXXMethodDecl *Invoke 9022 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 9023 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 9024 VK_LValue, Conv->getLocation()).take(); 9025 assert(FunctionRef && "Can't refer to __invoke function?"); 9026 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 9027 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 9028 Conv->getLocation(), 9029 Conv->getLocation())); 9030 9031 // Fill in the __invoke function with a dummy implementation. IR generation 9032 // will fill in the actual details. 9033 Invoke->setUsed(); 9034 Invoke->setReferenced(); 9035 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation())); 9036 9037 if (ASTMutationListener *L = getASTMutationListener()) { 9038 L->CompletedImplicitDefinition(Conv); 9039 L->CompletedImplicitDefinition(Invoke); 9040 } 9041} 9042 9043void Sema::DefineImplicitLambdaToBlockPointerConversion( 9044 SourceLocation CurrentLocation, 9045 CXXConversionDecl *Conv) 9046{ 9047 Conv->setUsed(); 9048 9049 SynthesizedFunctionScope Scope(*this, Conv); 9050 DiagnosticErrorTrap Trap(Diags); 9051 9052 // Copy-initialize the lambda object as needed to capture it. 9053 Expr *This = ActOnCXXThis(CurrentLocation).take(); 9054 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 9055 9056 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 9057 Conv->getLocation(), 9058 Conv, DerefThis); 9059 9060 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 9061 // behavior. Note that only the general conversion function does this 9062 // (since it's unusable otherwise); in the case where we inline the 9063 // block literal, it has block literal lifetime semantics. 9064 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 9065 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 9066 CK_CopyAndAutoreleaseBlockObject, 9067 BuildBlock.get(), 0, VK_RValue); 9068 9069 if (BuildBlock.isInvalid()) { 9070 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9071 Conv->setInvalidDecl(); 9072 return; 9073 } 9074 9075 // Create the return statement that returns the block from the conversion 9076 // function. 9077 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 9078 if (Return.isInvalid()) { 9079 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9080 Conv->setInvalidDecl(); 9081 return; 9082 } 9083 9084 // Set the body of the conversion function. 9085 Stmt *ReturnS = Return.take(); 9086 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 9087 Conv->getLocation(), 9088 Conv->getLocation())); 9089 9090 // We're done; notify the mutation listener, if any. 9091 if (ASTMutationListener *L = getASTMutationListener()) { 9092 L->CompletedImplicitDefinition(Conv); 9093 } 9094} 9095 9096/// \brief Determine whether the given list arguments contains exactly one 9097/// "real" (non-default) argument. 9098static bool hasOneRealArgument(MultiExprArg Args) { 9099 switch (Args.size()) { 9100 case 0: 9101 return false; 9102 9103 default: 9104 if (!Args[1]->isDefaultArgument()) 9105 return false; 9106 9107 // fall through 9108 case 1: 9109 return !Args[0]->isDefaultArgument(); 9110 } 9111 9112 return false; 9113} 9114 9115ExprResult 9116Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9117 CXXConstructorDecl *Constructor, 9118 MultiExprArg ExprArgs, 9119 bool HadMultipleCandidates, 9120 bool RequiresZeroInit, 9121 unsigned ConstructKind, 9122 SourceRange ParenRange) { 9123 bool Elidable = false; 9124 9125 // C++0x [class.copy]p34: 9126 // When certain criteria are met, an implementation is allowed to 9127 // omit the copy/move construction of a class object, even if the 9128 // copy/move constructor and/or destructor for the object have 9129 // side effects. [...] 9130 // - when a temporary class object that has not been bound to a 9131 // reference (12.2) would be copied/moved to a class object 9132 // with the same cv-unqualified type, the copy/move operation 9133 // can be omitted by constructing the temporary object 9134 // directly into the target of the omitted copy/move 9135 if (ConstructKind == CXXConstructExpr::CK_Complete && 9136 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9137 Expr *SubExpr = ExprArgs[0]; 9138 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9139 } 9140 9141 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9142 Elidable, ExprArgs, HadMultipleCandidates, 9143 RequiresZeroInit, ConstructKind, ParenRange); 9144} 9145 9146/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9147/// including handling of its default argument expressions. 9148ExprResult 9149Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9150 CXXConstructorDecl *Constructor, bool Elidable, 9151 MultiExprArg ExprArgs, 9152 bool HadMultipleCandidates, 9153 bool RequiresZeroInit, 9154 unsigned ConstructKind, 9155 SourceRange ParenRange) { 9156 MarkFunctionReferenced(ConstructLoc, Constructor); 9157 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9158 Constructor, Elidable, ExprArgs, 9159 HadMultipleCandidates, /*FIXME*/false, 9160 RequiresZeroInit, 9161 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9162 ParenRange)); 9163} 9164 9165bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9166 CXXConstructorDecl *Constructor, 9167 MultiExprArg Exprs, 9168 bool HadMultipleCandidates) { 9169 // FIXME: Provide the correct paren SourceRange when available. 9170 ExprResult TempResult = 9171 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9172 Exprs, HadMultipleCandidates, false, 9173 CXXConstructExpr::CK_Complete, SourceRange()); 9174 if (TempResult.isInvalid()) 9175 return true; 9176 9177 Expr *Temp = TempResult.takeAs<Expr>(); 9178 CheckImplicitConversions(Temp, VD->getLocation()); 9179 MarkFunctionReferenced(VD->getLocation(), Constructor); 9180 Temp = MaybeCreateExprWithCleanups(Temp); 9181 VD->setInit(Temp); 9182 9183 return false; 9184} 9185 9186void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9187 if (VD->isInvalidDecl()) return; 9188 9189 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9190 if (ClassDecl->isInvalidDecl()) return; 9191 if (ClassDecl->hasIrrelevantDestructor()) return; 9192 if (ClassDecl->isDependentContext()) return; 9193 9194 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9195 MarkFunctionReferenced(VD->getLocation(), Destructor); 9196 CheckDestructorAccess(VD->getLocation(), Destructor, 9197 PDiag(diag::err_access_dtor_var) 9198 << VD->getDeclName() 9199 << VD->getType()); 9200 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9201 9202 if (!VD->hasGlobalStorage()) return; 9203 9204 // Emit warning for non-trivial dtor in global scope (a real global, 9205 // class-static, function-static). 9206 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9207 9208 // TODO: this should be re-enabled for static locals by !CXAAtExit 9209 if (!VD->isStaticLocal()) 9210 Diag(VD->getLocation(), diag::warn_global_destructor); 9211} 9212 9213/// \brief Given a constructor and the set of arguments provided for the 9214/// constructor, convert the arguments and add any required default arguments 9215/// to form a proper call to this constructor. 9216/// 9217/// \returns true if an error occurred, false otherwise. 9218bool 9219Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9220 MultiExprArg ArgsPtr, 9221 SourceLocation Loc, 9222 SmallVectorImpl<Expr*> &ConvertedArgs, 9223 bool AllowExplicit) { 9224 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9225 unsigned NumArgs = ArgsPtr.size(); 9226 Expr **Args = ArgsPtr.data(); 9227 9228 const FunctionProtoType *Proto 9229 = Constructor->getType()->getAs<FunctionProtoType>(); 9230 assert(Proto && "Constructor without a prototype?"); 9231 unsigned NumArgsInProto = Proto->getNumArgs(); 9232 9233 // If too few arguments are available, we'll fill in the rest with defaults. 9234 if (NumArgs < NumArgsInProto) 9235 ConvertedArgs.reserve(NumArgsInProto); 9236 else 9237 ConvertedArgs.reserve(NumArgs); 9238 9239 VariadicCallType CallType = 9240 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9241 SmallVector<Expr *, 8> AllArgs; 9242 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9243 Proto, 0, Args, NumArgs, AllArgs, 9244 CallType, AllowExplicit); 9245 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9246 9247 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9248 9249 CheckConstructorCall(Constructor, AllArgs.data(), AllArgs.size(), 9250 Proto, Loc); 9251 9252 return Invalid; 9253} 9254 9255static inline bool 9256CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9257 const FunctionDecl *FnDecl) { 9258 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9259 if (isa<NamespaceDecl>(DC)) { 9260 return SemaRef.Diag(FnDecl->getLocation(), 9261 diag::err_operator_new_delete_declared_in_namespace) 9262 << FnDecl->getDeclName(); 9263 } 9264 9265 if (isa<TranslationUnitDecl>(DC) && 9266 FnDecl->getStorageClass() == SC_Static) { 9267 return SemaRef.Diag(FnDecl->getLocation(), 9268 diag::err_operator_new_delete_declared_static) 9269 << FnDecl->getDeclName(); 9270 } 9271 9272 return false; 9273} 9274 9275static inline bool 9276CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9277 CanQualType ExpectedResultType, 9278 CanQualType ExpectedFirstParamType, 9279 unsigned DependentParamTypeDiag, 9280 unsigned InvalidParamTypeDiag) { 9281 QualType ResultType = 9282 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9283 9284 // Check that the result type is not dependent. 9285 if (ResultType->isDependentType()) 9286 return SemaRef.Diag(FnDecl->getLocation(), 9287 diag::err_operator_new_delete_dependent_result_type) 9288 << FnDecl->getDeclName() << ExpectedResultType; 9289 9290 // Check that the result type is what we expect. 9291 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9292 return SemaRef.Diag(FnDecl->getLocation(), 9293 diag::err_operator_new_delete_invalid_result_type) 9294 << FnDecl->getDeclName() << ExpectedResultType; 9295 9296 // A function template must have at least 2 parameters. 9297 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9298 return SemaRef.Diag(FnDecl->getLocation(), 9299 diag::err_operator_new_delete_template_too_few_parameters) 9300 << FnDecl->getDeclName(); 9301 9302 // The function decl must have at least 1 parameter. 9303 if (FnDecl->getNumParams() == 0) 9304 return SemaRef.Diag(FnDecl->getLocation(), 9305 diag::err_operator_new_delete_too_few_parameters) 9306 << FnDecl->getDeclName(); 9307 9308 // Check the first parameter type is not dependent. 9309 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9310 if (FirstParamType->isDependentType()) 9311 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9312 << FnDecl->getDeclName() << ExpectedFirstParamType; 9313 9314 // Check that the first parameter type is what we expect. 9315 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9316 ExpectedFirstParamType) 9317 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9318 << FnDecl->getDeclName() << ExpectedFirstParamType; 9319 9320 return false; 9321} 9322 9323static bool 9324CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9325 // C++ [basic.stc.dynamic.allocation]p1: 9326 // A program is ill-formed if an allocation function is declared in a 9327 // namespace scope other than global scope or declared static in global 9328 // scope. 9329 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9330 return true; 9331 9332 CanQualType SizeTy = 9333 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9334 9335 // C++ [basic.stc.dynamic.allocation]p1: 9336 // The return type shall be void*. The first parameter shall have type 9337 // std::size_t. 9338 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9339 SizeTy, 9340 diag::err_operator_new_dependent_param_type, 9341 diag::err_operator_new_param_type)) 9342 return true; 9343 9344 // C++ [basic.stc.dynamic.allocation]p1: 9345 // The first parameter shall not have an associated default argument. 9346 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9347 return SemaRef.Diag(FnDecl->getLocation(), 9348 diag::err_operator_new_default_arg) 9349 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9350 9351 return false; 9352} 9353 9354static bool 9355CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) { 9356 // C++ [basic.stc.dynamic.deallocation]p1: 9357 // A program is ill-formed if deallocation functions are declared in a 9358 // namespace scope other than global scope or declared static in global 9359 // scope. 9360 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9361 return true; 9362 9363 // C++ [basic.stc.dynamic.deallocation]p2: 9364 // Each deallocation function shall return void and its first parameter 9365 // shall be void*. 9366 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9367 SemaRef.Context.VoidPtrTy, 9368 diag::err_operator_delete_dependent_param_type, 9369 diag::err_operator_delete_param_type)) 9370 return true; 9371 9372 return false; 9373} 9374 9375/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9376/// of this overloaded operator is well-formed. If so, returns false; 9377/// otherwise, emits appropriate diagnostics and returns true. 9378bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9379 assert(FnDecl && FnDecl->isOverloadedOperator() && 9380 "Expected an overloaded operator declaration"); 9381 9382 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9383 9384 // C++ [over.oper]p5: 9385 // The allocation and deallocation functions, operator new, 9386 // operator new[], operator delete and operator delete[], are 9387 // described completely in 3.7.3. The attributes and restrictions 9388 // found in the rest of this subclause do not apply to them unless 9389 // explicitly stated in 3.7.3. 9390 if (Op == OO_Delete || Op == OO_Array_Delete) 9391 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9392 9393 if (Op == OO_New || Op == OO_Array_New) 9394 return CheckOperatorNewDeclaration(*this, FnDecl); 9395 9396 // C++ [over.oper]p6: 9397 // An operator function shall either be a non-static member 9398 // function or be a non-member function and have at least one 9399 // parameter whose type is a class, a reference to a class, an 9400 // enumeration, or a reference to an enumeration. 9401 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9402 if (MethodDecl->isStatic()) 9403 return Diag(FnDecl->getLocation(), 9404 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9405 } else { 9406 bool ClassOrEnumParam = false; 9407 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9408 ParamEnd = FnDecl->param_end(); 9409 Param != ParamEnd; ++Param) { 9410 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9411 if (ParamType->isDependentType() || ParamType->isRecordType() || 9412 ParamType->isEnumeralType()) { 9413 ClassOrEnumParam = true; 9414 break; 9415 } 9416 } 9417 9418 if (!ClassOrEnumParam) 9419 return Diag(FnDecl->getLocation(), 9420 diag::err_operator_overload_needs_class_or_enum) 9421 << FnDecl->getDeclName(); 9422 } 9423 9424 // C++ [over.oper]p8: 9425 // An operator function cannot have default arguments (8.3.6), 9426 // except where explicitly stated below. 9427 // 9428 // Only the function-call operator allows default arguments 9429 // (C++ [over.call]p1). 9430 if (Op != OO_Call) { 9431 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9432 Param != FnDecl->param_end(); ++Param) { 9433 if ((*Param)->hasDefaultArg()) 9434 return Diag((*Param)->getLocation(), 9435 diag::err_operator_overload_default_arg) 9436 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9437 } 9438 } 9439 9440 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9441 { false, false, false } 9442#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9443 , { Unary, Binary, MemberOnly } 9444#include "clang/Basic/OperatorKinds.def" 9445 }; 9446 9447 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9448 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9449 bool MustBeMemberOperator = OperatorUses[Op][2]; 9450 9451 // C++ [over.oper]p8: 9452 // [...] Operator functions cannot have more or fewer parameters 9453 // than the number required for the corresponding operator, as 9454 // described in the rest of this subclause. 9455 unsigned NumParams = FnDecl->getNumParams() 9456 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9457 if (Op != OO_Call && 9458 ((NumParams == 1 && !CanBeUnaryOperator) || 9459 (NumParams == 2 && !CanBeBinaryOperator) || 9460 (NumParams < 1) || (NumParams > 2))) { 9461 // We have the wrong number of parameters. 9462 unsigned ErrorKind; 9463 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9464 ErrorKind = 2; // 2 -> unary or binary. 9465 } else if (CanBeUnaryOperator) { 9466 ErrorKind = 0; // 0 -> unary 9467 } else { 9468 assert(CanBeBinaryOperator && 9469 "All non-call overloaded operators are unary or binary!"); 9470 ErrorKind = 1; // 1 -> binary 9471 } 9472 9473 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9474 << FnDecl->getDeclName() << NumParams << ErrorKind; 9475 } 9476 9477 // Overloaded operators other than operator() cannot be variadic. 9478 if (Op != OO_Call && 9479 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9480 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9481 << FnDecl->getDeclName(); 9482 } 9483 9484 // Some operators must be non-static member functions. 9485 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9486 return Diag(FnDecl->getLocation(), 9487 diag::err_operator_overload_must_be_member) 9488 << FnDecl->getDeclName(); 9489 } 9490 9491 // C++ [over.inc]p1: 9492 // The user-defined function called operator++ implements the 9493 // prefix and postfix ++ operator. If this function is a member 9494 // function with no parameters, or a non-member function with one 9495 // parameter of class or enumeration type, it defines the prefix 9496 // increment operator ++ for objects of that type. If the function 9497 // is a member function with one parameter (which shall be of type 9498 // int) or a non-member function with two parameters (the second 9499 // of which shall be of type int), it defines the postfix 9500 // increment operator ++ for objects of that type. 9501 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9502 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9503 bool ParamIsInt = false; 9504 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9505 ParamIsInt = BT->getKind() == BuiltinType::Int; 9506 9507 if (!ParamIsInt) 9508 return Diag(LastParam->getLocation(), 9509 diag::err_operator_overload_post_incdec_must_be_int) 9510 << LastParam->getType() << (Op == OO_MinusMinus); 9511 } 9512 9513 return false; 9514} 9515 9516/// CheckLiteralOperatorDeclaration - Check whether the declaration 9517/// of this literal operator function is well-formed. If so, returns 9518/// false; otherwise, emits appropriate diagnostics and returns true. 9519bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9520 if (isa<CXXMethodDecl>(FnDecl)) { 9521 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9522 << FnDecl->getDeclName(); 9523 return true; 9524 } 9525 9526 if (FnDecl->isExternC()) { 9527 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 9528 return true; 9529 } 9530 9531 bool Valid = false; 9532 9533 // This might be the definition of a literal operator template. 9534 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 9535 // This might be a specialization of a literal operator template. 9536 if (!TpDecl) 9537 TpDecl = FnDecl->getPrimaryTemplate(); 9538 9539 // template <char...> type operator "" name() is the only valid template 9540 // signature, and the only valid signature with no parameters. 9541 if (TpDecl) { 9542 if (FnDecl->param_size() == 0) { 9543 // Must have only one template parameter 9544 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9545 if (Params->size() == 1) { 9546 NonTypeTemplateParmDecl *PmDecl = 9547 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9548 9549 // The template parameter must be a char parameter pack. 9550 if (PmDecl && PmDecl->isTemplateParameterPack() && 9551 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9552 Valid = true; 9553 } 9554 } 9555 } else if (FnDecl->param_size()) { 9556 // Check the first parameter 9557 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9558 9559 QualType T = (*Param)->getType().getUnqualifiedType(); 9560 9561 // unsigned long long int, long double, and any character type are allowed 9562 // as the only parameters. 9563 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9564 Context.hasSameType(T, Context.LongDoubleTy) || 9565 Context.hasSameType(T, Context.CharTy) || 9566 Context.hasSameType(T, Context.WCharTy) || 9567 Context.hasSameType(T, Context.Char16Ty) || 9568 Context.hasSameType(T, Context.Char32Ty)) { 9569 if (++Param == FnDecl->param_end()) 9570 Valid = true; 9571 goto FinishedParams; 9572 } 9573 9574 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9575 const PointerType *PT = T->getAs<PointerType>(); 9576 if (!PT) 9577 goto FinishedParams; 9578 T = PT->getPointeeType(); 9579 if (!T.isConstQualified() || T.isVolatileQualified()) 9580 goto FinishedParams; 9581 T = T.getUnqualifiedType(); 9582 9583 // Move on to the second parameter; 9584 ++Param; 9585 9586 // If there is no second parameter, the first must be a const char * 9587 if (Param == FnDecl->param_end()) { 9588 if (Context.hasSameType(T, Context.CharTy)) 9589 Valid = true; 9590 goto FinishedParams; 9591 } 9592 9593 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9594 // are allowed as the first parameter to a two-parameter function 9595 if (!(Context.hasSameType(T, Context.CharTy) || 9596 Context.hasSameType(T, Context.WCharTy) || 9597 Context.hasSameType(T, Context.Char16Ty) || 9598 Context.hasSameType(T, Context.Char32Ty))) 9599 goto FinishedParams; 9600 9601 // The second and final parameter must be an std::size_t 9602 T = (*Param)->getType().getUnqualifiedType(); 9603 if (Context.hasSameType(T, Context.getSizeType()) && 9604 ++Param == FnDecl->param_end()) 9605 Valid = true; 9606 } 9607 9608 // FIXME: This diagnostic is absolutely terrible. 9609FinishedParams: 9610 if (!Valid) { 9611 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9612 << FnDecl->getDeclName(); 9613 return true; 9614 } 9615 9616 // A parameter-declaration-clause containing a default argument is not 9617 // equivalent to any of the permitted forms. 9618 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9619 ParamEnd = FnDecl->param_end(); 9620 Param != ParamEnd; ++Param) { 9621 if ((*Param)->hasDefaultArg()) { 9622 Diag((*Param)->getDefaultArgRange().getBegin(), 9623 diag::err_literal_operator_default_argument) 9624 << (*Param)->getDefaultArgRange(); 9625 break; 9626 } 9627 } 9628 9629 StringRef LiteralName 9630 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9631 if (LiteralName[0] != '_') { 9632 // C++11 [usrlit.suffix]p1: 9633 // Literal suffix identifiers that do not start with an underscore 9634 // are reserved for future standardization. 9635 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9636 } 9637 9638 return false; 9639} 9640 9641/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9642/// linkage specification, including the language and (if present) 9643/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9644/// the location of the language string literal, which is provided 9645/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9646/// the '{' brace. Otherwise, this linkage specification does not 9647/// have any braces. 9648Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9649 SourceLocation LangLoc, 9650 StringRef Lang, 9651 SourceLocation LBraceLoc) { 9652 LinkageSpecDecl::LanguageIDs Language; 9653 if (Lang == "\"C\"") 9654 Language = LinkageSpecDecl::lang_c; 9655 else if (Lang == "\"C++\"") 9656 Language = LinkageSpecDecl::lang_cxx; 9657 else { 9658 Diag(LangLoc, diag::err_bad_language); 9659 return 0; 9660 } 9661 9662 // FIXME: Add all the various semantics of linkage specifications 9663 9664 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9665 ExternLoc, LangLoc, Language); 9666 CurContext->addDecl(D); 9667 PushDeclContext(S, D); 9668 return D; 9669} 9670 9671/// ActOnFinishLinkageSpecification - Complete the definition of 9672/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9673/// valid, it's the position of the closing '}' brace in a linkage 9674/// specification that uses braces. 9675Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9676 Decl *LinkageSpec, 9677 SourceLocation RBraceLoc) { 9678 if (LinkageSpec) { 9679 if (RBraceLoc.isValid()) { 9680 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9681 LSDecl->setRBraceLoc(RBraceLoc); 9682 } 9683 PopDeclContext(); 9684 } 9685 return LinkageSpec; 9686} 9687 9688/// \brief Perform semantic analysis for the variable declaration that 9689/// occurs within a C++ catch clause, returning the newly-created 9690/// variable. 9691VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9692 TypeSourceInfo *TInfo, 9693 SourceLocation StartLoc, 9694 SourceLocation Loc, 9695 IdentifierInfo *Name) { 9696 bool Invalid = false; 9697 QualType ExDeclType = TInfo->getType(); 9698 9699 // Arrays and functions decay. 9700 if (ExDeclType->isArrayType()) 9701 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9702 else if (ExDeclType->isFunctionType()) 9703 ExDeclType = Context.getPointerType(ExDeclType); 9704 9705 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9706 // The exception-declaration shall not denote a pointer or reference to an 9707 // incomplete type, other than [cv] void*. 9708 // N2844 forbids rvalue references. 9709 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9710 Diag(Loc, diag::err_catch_rvalue_ref); 9711 Invalid = true; 9712 } 9713 9714 QualType BaseType = ExDeclType; 9715 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9716 unsigned DK = diag::err_catch_incomplete; 9717 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9718 BaseType = Ptr->getPointeeType(); 9719 Mode = 1; 9720 DK = diag::err_catch_incomplete_ptr; 9721 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9722 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9723 BaseType = Ref->getPointeeType(); 9724 Mode = 2; 9725 DK = diag::err_catch_incomplete_ref; 9726 } 9727 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9728 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9729 Invalid = true; 9730 9731 if (!Invalid && !ExDeclType->isDependentType() && 9732 RequireNonAbstractType(Loc, ExDeclType, 9733 diag::err_abstract_type_in_decl, 9734 AbstractVariableType)) 9735 Invalid = true; 9736 9737 // Only the non-fragile NeXT runtime currently supports C++ catches 9738 // of ObjC types, and no runtime supports catching ObjC types by value. 9739 if (!Invalid && getLangOpts().ObjC1) { 9740 QualType T = ExDeclType; 9741 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9742 T = RT->getPointeeType(); 9743 9744 if (T->isObjCObjectType()) { 9745 Diag(Loc, diag::err_objc_object_catch); 9746 Invalid = true; 9747 } else if (T->isObjCObjectPointerType()) { 9748 // FIXME: should this be a test for macosx-fragile specifically? 9749 if (getLangOpts().ObjCRuntime.isFragile()) 9750 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9751 } 9752 } 9753 9754 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9755 ExDeclType, TInfo, SC_None, SC_None); 9756 ExDecl->setExceptionVariable(true); 9757 9758 // In ARC, infer 'retaining' for variables of retainable type. 9759 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9760 Invalid = true; 9761 9762 if (!Invalid && !ExDeclType->isDependentType()) { 9763 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9764 // C++ [except.handle]p16: 9765 // The object declared in an exception-declaration or, if the 9766 // exception-declaration does not specify a name, a temporary (12.2) is 9767 // copy-initialized (8.5) from the exception object. [...] 9768 // The object is destroyed when the handler exits, after the destruction 9769 // of any automatic objects initialized within the handler. 9770 // 9771 // We just pretend to initialize the object with itself, then make sure 9772 // it can be destroyed later. 9773 QualType initType = ExDeclType; 9774 9775 InitializedEntity entity = 9776 InitializedEntity::InitializeVariable(ExDecl); 9777 InitializationKind initKind = 9778 InitializationKind::CreateCopy(Loc, SourceLocation()); 9779 9780 Expr *opaqueValue = 9781 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9782 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9783 ExprResult result = sequence.Perform(*this, entity, initKind, 9784 MultiExprArg(&opaqueValue, 1)); 9785 if (result.isInvalid()) 9786 Invalid = true; 9787 else { 9788 // If the constructor used was non-trivial, set this as the 9789 // "initializer". 9790 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9791 if (!construct->getConstructor()->isTrivial()) { 9792 Expr *init = MaybeCreateExprWithCleanups(construct); 9793 ExDecl->setInit(init); 9794 } 9795 9796 // And make sure it's destructable. 9797 FinalizeVarWithDestructor(ExDecl, recordType); 9798 } 9799 } 9800 } 9801 9802 if (Invalid) 9803 ExDecl->setInvalidDecl(); 9804 9805 return ExDecl; 9806} 9807 9808/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9809/// handler. 9810Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9811 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9812 bool Invalid = D.isInvalidType(); 9813 9814 // Check for unexpanded parameter packs. 9815 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9816 UPPC_ExceptionType)) { 9817 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9818 D.getIdentifierLoc()); 9819 Invalid = true; 9820 } 9821 9822 IdentifierInfo *II = D.getIdentifier(); 9823 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9824 LookupOrdinaryName, 9825 ForRedeclaration)) { 9826 // The scope should be freshly made just for us. There is just no way 9827 // it contains any previous declaration. 9828 assert(!S->isDeclScope(PrevDecl)); 9829 if (PrevDecl->isTemplateParameter()) { 9830 // Maybe we will complain about the shadowed template parameter. 9831 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9832 PrevDecl = 0; 9833 } 9834 } 9835 9836 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9837 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9838 << D.getCXXScopeSpec().getRange(); 9839 Invalid = true; 9840 } 9841 9842 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9843 D.getLocStart(), 9844 D.getIdentifierLoc(), 9845 D.getIdentifier()); 9846 if (Invalid) 9847 ExDecl->setInvalidDecl(); 9848 9849 // Add the exception declaration into this scope. 9850 if (II) 9851 PushOnScopeChains(ExDecl, S); 9852 else 9853 CurContext->addDecl(ExDecl); 9854 9855 ProcessDeclAttributes(S, ExDecl, D); 9856 return ExDecl; 9857} 9858 9859Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9860 Expr *AssertExpr, 9861 Expr *AssertMessageExpr, 9862 SourceLocation RParenLoc) { 9863 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 9864 9865 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9866 return 0; 9867 9868 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 9869 AssertMessage, RParenLoc, false); 9870} 9871 9872Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9873 Expr *AssertExpr, 9874 StringLiteral *AssertMessage, 9875 SourceLocation RParenLoc, 9876 bool Failed) { 9877 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 9878 !Failed) { 9879 // In a static_assert-declaration, the constant-expression shall be a 9880 // constant expression that can be contextually converted to bool. 9881 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9882 if (Converted.isInvalid()) 9883 Failed = true; 9884 9885 llvm::APSInt Cond; 9886 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 9887 diag::err_static_assert_expression_is_not_constant, 9888 /*AllowFold=*/false).isInvalid()) 9889 Failed = true; 9890 9891 if (!Failed && !Cond) { 9892 llvm::SmallString<256> MsgBuffer; 9893 llvm::raw_svector_ostream Msg(MsgBuffer); 9894 AssertMessage->printPretty(Msg, 0, getPrintingPolicy()); 9895 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9896 << Msg.str() << AssertExpr->getSourceRange(); 9897 Failed = true; 9898 } 9899 } 9900 9901 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9902 AssertExpr, AssertMessage, RParenLoc, 9903 Failed); 9904 9905 CurContext->addDecl(Decl); 9906 return Decl; 9907} 9908 9909/// \brief Perform semantic analysis of the given friend type declaration. 9910/// 9911/// \returns A friend declaration that. 9912FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart, 9913 SourceLocation FriendLoc, 9914 TypeSourceInfo *TSInfo) { 9915 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9916 9917 QualType T = TSInfo->getType(); 9918 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9919 9920 // C++03 [class.friend]p2: 9921 // An elaborated-type-specifier shall be used in a friend declaration 9922 // for a class.* 9923 // 9924 // * The class-key of the elaborated-type-specifier is required. 9925 if (!ActiveTemplateInstantiations.empty()) { 9926 // Do not complain about the form of friend template types during 9927 // template instantiation; we will already have complained when the 9928 // template was declared. 9929 } else if (!T->isElaboratedTypeSpecifier()) { 9930 // If we evaluated the type to a record type, suggest putting 9931 // a tag in front. 9932 if (const RecordType *RT = T->getAs<RecordType>()) { 9933 RecordDecl *RD = RT->getDecl(); 9934 9935 std::string InsertionText = std::string(" ") + RD->getKindName(); 9936 9937 Diag(TypeRange.getBegin(), 9938 getLangOpts().CPlusPlus0x ? 9939 diag::warn_cxx98_compat_unelaborated_friend_type : 9940 diag::ext_unelaborated_friend_type) 9941 << (unsigned) RD->getTagKind() 9942 << T 9943 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9944 InsertionText); 9945 } else { 9946 Diag(FriendLoc, 9947 getLangOpts().CPlusPlus0x ? 9948 diag::warn_cxx98_compat_nonclass_type_friend : 9949 diag::ext_nonclass_type_friend) 9950 << T 9951 << TypeRange; 9952 } 9953 } else if (T->getAs<EnumType>()) { 9954 Diag(FriendLoc, 9955 getLangOpts().CPlusPlus0x ? 9956 diag::warn_cxx98_compat_enum_friend : 9957 diag::ext_enum_friend) 9958 << T 9959 << TypeRange; 9960 } 9961 9962 // C++11 [class.friend]p3: 9963 // A friend declaration that does not declare a function shall have one 9964 // of the following forms: 9965 // friend elaborated-type-specifier ; 9966 // friend simple-type-specifier ; 9967 // friend typename-specifier ; 9968 if (getLangOpts().CPlusPlus0x && LocStart != FriendLoc) 9969 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T; 9970 9971 // If the type specifier in a friend declaration designates a (possibly 9972 // cv-qualified) class type, that class is declared as a friend; otherwise, 9973 // the friend declaration is ignored. 9974 return FriendDecl::Create(Context, CurContext, LocStart, TSInfo, FriendLoc); 9975} 9976 9977/// Handle a friend tag declaration where the scope specifier was 9978/// templated. 9979Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9980 unsigned TagSpec, SourceLocation TagLoc, 9981 CXXScopeSpec &SS, 9982 IdentifierInfo *Name, SourceLocation NameLoc, 9983 AttributeList *Attr, 9984 MultiTemplateParamsArg TempParamLists) { 9985 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9986 9987 bool isExplicitSpecialization = false; 9988 bool Invalid = false; 9989 9990 if (TemplateParameterList *TemplateParams 9991 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9992 TempParamLists.data(), 9993 TempParamLists.size(), 9994 /*friend*/ true, 9995 isExplicitSpecialization, 9996 Invalid)) { 9997 if (TemplateParams->size() > 0) { 9998 // This is a declaration of a class template. 9999 if (Invalid) 10000 return 0; 10001 10002 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 10003 SS, Name, NameLoc, Attr, 10004 TemplateParams, AS_public, 10005 /*ModulePrivateLoc=*/SourceLocation(), 10006 TempParamLists.size() - 1, 10007 TempParamLists.data()).take(); 10008 } else { 10009 // The "template<>" header is extraneous. 10010 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 10011 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 10012 isExplicitSpecialization = true; 10013 } 10014 } 10015 10016 if (Invalid) return 0; 10017 10018 bool isAllExplicitSpecializations = true; 10019 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 10020 if (TempParamLists[I]->size()) { 10021 isAllExplicitSpecializations = false; 10022 break; 10023 } 10024 } 10025 10026 // FIXME: don't ignore attributes. 10027 10028 // If it's explicit specializations all the way down, just forget 10029 // about the template header and build an appropriate non-templated 10030 // friend. TODO: for source fidelity, remember the headers. 10031 if (isAllExplicitSpecializations) { 10032 if (SS.isEmpty()) { 10033 bool Owned = false; 10034 bool IsDependent = false; 10035 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 10036 Attr, AS_public, 10037 /*ModulePrivateLoc=*/SourceLocation(), 10038 MultiTemplateParamsArg(), Owned, IsDependent, 10039 /*ScopedEnumKWLoc=*/SourceLocation(), 10040 /*ScopedEnumUsesClassTag=*/false, 10041 /*UnderlyingType=*/TypeResult()); 10042 } 10043 10044 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 10045 ElaboratedTypeKeyword Keyword 10046 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10047 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 10048 *Name, NameLoc); 10049 if (T.isNull()) 10050 return 0; 10051 10052 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10053 if (isa<DependentNameType>(T)) { 10054 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10055 TL.setElaboratedKeywordLoc(TagLoc); 10056 TL.setQualifierLoc(QualifierLoc); 10057 TL.setNameLoc(NameLoc); 10058 } else { 10059 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 10060 TL.setElaboratedKeywordLoc(TagLoc); 10061 TL.setQualifierLoc(QualifierLoc); 10062 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 10063 } 10064 10065 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10066 TSI, FriendLoc); 10067 Friend->setAccess(AS_public); 10068 CurContext->addDecl(Friend); 10069 return Friend; 10070 } 10071 10072 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 10073 10074 10075 10076 // Handle the case of a templated-scope friend class. e.g. 10077 // template <class T> class A<T>::B; 10078 // FIXME: we don't support these right now. 10079 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10080 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10081 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10082 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10083 TL.setElaboratedKeywordLoc(TagLoc); 10084 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10085 TL.setNameLoc(NameLoc); 10086 10087 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10088 TSI, FriendLoc); 10089 Friend->setAccess(AS_public); 10090 Friend->setUnsupportedFriend(true); 10091 CurContext->addDecl(Friend); 10092 return Friend; 10093} 10094 10095 10096/// Handle a friend type declaration. This works in tandem with 10097/// ActOnTag. 10098/// 10099/// Notes on friend class templates: 10100/// 10101/// We generally treat friend class declarations as if they were 10102/// declaring a class. So, for example, the elaborated type specifier 10103/// in a friend declaration is required to obey the restrictions of a 10104/// class-head (i.e. no typedefs in the scope chain), template 10105/// parameters are required to match up with simple template-ids, &c. 10106/// However, unlike when declaring a template specialization, it's 10107/// okay to refer to a template specialization without an empty 10108/// template parameter declaration, e.g. 10109/// friend class A<T>::B<unsigned>; 10110/// We permit this as a special case; if there are any template 10111/// parameters present at all, require proper matching, i.e. 10112/// template <> template \<class T> friend class A<int>::B; 10113Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10114 MultiTemplateParamsArg TempParams) { 10115 SourceLocation Loc = DS.getLocStart(); 10116 10117 assert(DS.isFriendSpecified()); 10118 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10119 10120 // Try to convert the decl specifier to a type. This works for 10121 // friend templates because ActOnTag never produces a ClassTemplateDecl 10122 // for a TUK_Friend. 10123 Declarator TheDeclarator(DS, Declarator::MemberContext); 10124 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10125 QualType T = TSI->getType(); 10126 if (TheDeclarator.isInvalidType()) 10127 return 0; 10128 10129 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10130 return 0; 10131 10132 // This is definitely an error in C++98. It's probably meant to 10133 // be forbidden in C++0x, too, but the specification is just 10134 // poorly written. 10135 // 10136 // The problem is with declarations like the following: 10137 // template <T> friend A<T>::foo; 10138 // where deciding whether a class C is a friend or not now hinges 10139 // on whether there exists an instantiation of A that causes 10140 // 'foo' to equal C. There are restrictions on class-heads 10141 // (which we declare (by fiat) elaborated friend declarations to 10142 // be) that makes this tractable. 10143 // 10144 // FIXME: handle "template <> friend class A<T>;", which 10145 // is possibly well-formed? Who even knows? 10146 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10147 Diag(Loc, diag::err_tagless_friend_type_template) 10148 << DS.getSourceRange(); 10149 return 0; 10150 } 10151 10152 // C++98 [class.friend]p1: A friend of a class is a function 10153 // or class that is not a member of the class . . . 10154 // This is fixed in DR77, which just barely didn't make the C++03 10155 // deadline. It's also a very silly restriction that seriously 10156 // affects inner classes and which nobody else seems to implement; 10157 // thus we never diagnose it, not even in -pedantic. 10158 // 10159 // But note that we could warn about it: it's always useless to 10160 // friend one of your own members (it's not, however, worthless to 10161 // friend a member of an arbitrary specialization of your template). 10162 10163 Decl *D; 10164 if (unsigned NumTempParamLists = TempParams.size()) 10165 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10166 NumTempParamLists, 10167 TempParams.data(), 10168 TSI, 10169 DS.getFriendSpecLoc()); 10170 else 10171 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10172 10173 if (!D) 10174 return 0; 10175 10176 D->setAccess(AS_public); 10177 CurContext->addDecl(D); 10178 10179 return D; 10180} 10181 10182Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10183 MultiTemplateParamsArg TemplateParams) { 10184 const DeclSpec &DS = D.getDeclSpec(); 10185 10186 assert(DS.isFriendSpecified()); 10187 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10188 10189 SourceLocation Loc = D.getIdentifierLoc(); 10190 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10191 10192 // C++ [class.friend]p1 10193 // A friend of a class is a function or class.... 10194 // Note that this sees through typedefs, which is intended. 10195 // It *doesn't* see through dependent types, which is correct 10196 // according to [temp.arg.type]p3: 10197 // If a declaration acquires a function type through a 10198 // type dependent on a template-parameter and this causes 10199 // a declaration that does not use the syntactic form of a 10200 // function declarator to have a function type, the program 10201 // is ill-formed. 10202 if (!TInfo->getType()->isFunctionType()) { 10203 Diag(Loc, diag::err_unexpected_friend); 10204 10205 // It might be worthwhile to try to recover by creating an 10206 // appropriate declaration. 10207 return 0; 10208 } 10209 10210 // C++ [namespace.memdef]p3 10211 // - If a friend declaration in a non-local class first declares a 10212 // class or function, the friend class or function is a member 10213 // of the innermost enclosing namespace. 10214 // - The name of the friend is not found by simple name lookup 10215 // until a matching declaration is provided in that namespace 10216 // scope (either before or after the class declaration granting 10217 // friendship). 10218 // - If a friend function is called, its name may be found by the 10219 // name lookup that considers functions from namespaces and 10220 // classes associated with the types of the function arguments. 10221 // - When looking for a prior declaration of a class or a function 10222 // declared as a friend, scopes outside the innermost enclosing 10223 // namespace scope are not considered. 10224 10225 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10226 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10227 DeclarationName Name = NameInfo.getName(); 10228 assert(Name); 10229 10230 // Check for unexpanded parameter packs. 10231 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10232 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10233 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10234 return 0; 10235 10236 // The context we found the declaration in, or in which we should 10237 // create the declaration. 10238 DeclContext *DC; 10239 Scope *DCScope = S; 10240 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10241 ForRedeclaration); 10242 10243 // FIXME: there are different rules in local classes 10244 10245 // There are four cases here. 10246 // - There's no scope specifier, in which case we just go to the 10247 // appropriate scope and look for a function or function template 10248 // there as appropriate. 10249 // Recover from invalid scope qualifiers as if they just weren't there. 10250 if (SS.isInvalid() || !SS.isSet()) { 10251 // C++0x [namespace.memdef]p3: 10252 // If the name in a friend declaration is neither qualified nor 10253 // a template-id and the declaration is a function or an 10254 // elaborated-type-specifier, the lookup to determine whether 10255 // the entity has been previously declared shall not consider 10256 // any scopes outside the innermost enclosing namespace. 10257 // C++0x [class.friend]p11: 10258 // If a friend declaration appears in a local class and the name 10259 // specified is an unqualified name, a prior declaration is 10260 // looked up without considering scopes that are outside the 10261 // innermost enclosing non-class scope. For a friend function 10262 // declaration, if there is no prior declaration, the program is 10263 // ill-formed. 10264 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10265 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10266 10267 // Find the appropriate context according to the above. 10268 DC = CurContext; 10269 while (true) { 10270 // Skip class contexts. If someone can cite chapter and verse 10271 // for this behavior, that would be nice --- it's what GCC and 10272 // EDG do, and it seems like a reasonable intent, but the spec 10273 // really only says that checks for unqualified existing 10274 // declarations should stop at the nearest enclosing namespace, 10275 // not that they should only consider the nearest enclosing 10276 // namespace. 10277 while (DC->isRecord() || DC->isTransparentContext()) 10278 DC = DC->getParent(); 10279 10280 LookupQualifiedName(Previous, DC); 10281 10282 // TODO: decide what we think about using declarations. 10283 if (isLocal || !Previous.empty()) 10284 break; 10285 10286 if (isTemplateId) { 10287 if (isa<TranslationUnitDecl>(DC)) break; 10288 } else { 10289 if (DC->isFileContext()) break; 10290 } 10291 DC = DC->getParent(); 10292 } 10293 10294 // C++ [class.friend]p1: A friend of a class is a function or 10295 // class that is not a member of the class . . . 10296 // C++11 changes this for both friend types and functions. 10297 // Most C++ 98 compilers do seem to give an error here, so 10298 // we do, too. 10299 if (!Previous.empty() && DC->Equals(CurContext)) 10300 Diag(DS.getFriendSpecLoc(), 10301 getLangOpts().CPlusPlus0x ? 10302 diag::warn_cxx98_compat_friend_is_member : 10303 diag::err_friend_is_member); 10304 10305 DCScope = getScopeForDeclContext(S, DC); 10306 10307 // C++ [class.friend]p6: 10308 // A function can be defined in a friend declaration of a class if and 10309 // only if the class is a non-local class (9.8), the function name is 10310 // unqualified, and the function has namespace scope. 10311 if (isLocal && D.isFunctionDefinition()) { 10312 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10313 } 10314 10315 // - There's a non-dependent scope specifier, in which case we 10316 // compute it and do a previous lookup there for a function 10317 // or function template. 10318 } else if (!SS.getScopeRep()->isDependent()) { 10319 DC = computeDeclContext(SS); 10320 if (!DC) return 0; 10321 10322 if (RequireCompleteDeclContext(SS, DC)) return 0; 10323 10324 LookupQualifiedName(Previous, DC); 10325 10326 // Ignore things found implicitly in the wrong scope. 10327 // TODO: better diagnostics for this case. Suggesting the right 10328 // qualified scope would be nice... 10329 LookupResult::Filter F = Previous.makeFilter(); 10330 while (F.hasNext()) { 10331 NamedDecl *D = F.next(); 10332 if (!DC->InEnclosingNamespaceSetOf( 10333 D->getDeclContext()->getRedeclContext())) 10334 F.erase(); 10335 } 10336 F.done(); 10337 10338 if (Previous.empty()) { 10339 D.setInvalidType(); 10340 Diag(Loc, diag::err_qualified_friend_not_found) 10341 << Name << TInfo->getType(); 10342 return 0; 10343 } 10344 10345 // C++ [class.friend]p1: A friend of a class is a function or 10346 // class that is not a member of the class . . . 10347 if (DC->Equals(CurContext)) 10348 Diag(DS.getFriendSpecLoc(), 10349 getLangOpts().CPlusPlus0x ? 10350 diag::warn_cxx98_compat_friend_is_member : 10351 diag::err_friend_is_member); 10352 10353 if (D.isFunctionDefinition()) { 10354 // C++ [class.friend]p6: 10355 // A function can be defined in a friend declaration of a class if and 10356 // only if the class is a non-local class (9.8), the function name is 10357 // unqualified, and the function has namespace scope. 10358 SemaDiagnosticBuilder DB 10359 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10360 10361 DB << SS.getScopeRep(); 10362 if (DC->isFileContext()) 10363 DB << FixItHint::CreateRemoval(SS.getRange()); 10364 SS.clear(); 10365 } 10366 10367 // - There's a scope specifier that does not match any template 10368 // parameter lists, in which case we use some arbitrary context, 10369 // create a method or method template, and wait for instantiation. 10370 // - There's a scope specifier that does match some template 10371 // parameter lists, which we don't handle right now. 10372 } else { 10373 if (D.isFunctionDefinition()) { 10374 // C++ [class.friend]p6: 10375 // A function can be defined in a friend declaration of a class if and 10376 // only if the class is a non-local class (9.8), the function name is 10377 // unqualified, and the function has namespace scope. 10378 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10379 << SS.getScopeRep(); 10380 } 10381 10382 DC = CurContext; 10383 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10384 } 10385 10386 if (!DC->isRecord()) { 10387 // This implies that it has to be an operator or function. 10388 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10389 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10390 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10391 Diag(Loc, diag::err_introducing_special_friend) << 10392 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10393 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10394 return 0; 10395 } 10396 } 10397 10398 // FIXME: This is an egregious hack to cope with cases where the scope stack 10399 // does not contain the declaration context, i.e., in an out-of-line 10400 // definition of a class. 10401 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10402 if (!DCScope) { 10403 FakeDCScope.setEntity(DC); 10404 DCScope = &FakeDCScope; 10405 } 10406 10407 bool AddToScope = true; 10408 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10409 TemplateParams, AddToScope); 10410 if (!ND) return 0; 10411 10412 assert(ND->getDeclContext() == DC); 10413 assert(ND->getLexicalDeclContext() == CurContext); 10414 10415 // Add the function declaration to the appropriate lookup tables, 10416 // adjusting the redeclarations list as necessary. We don't 10417 // want to do this yet if the friending class is dependent. 10418 // 10419 // Also update the scope-based lookup if the target context's 10420 // lookup context is in lexical scope. 10421 if (!CurContext->isDependentContext()) { 10422 DC = DC->getRedeclContext(); 10423 DC->makeDeclVisibleInContext(ND); 10424 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10425 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10426 } 10427 10428 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10429 D.getIdentifierLoc(), ND, 10430 DS.getFriendSpecLoc()); 10431 FrD->setAccess(AS_public); 10432 CurContext->addDecl(FrD); 10433 10434 if (ND->isInvalidDecl()) { 10435 FrD->setInvalidDecl(); 10436 } else { 10437 if (DC->isRecord()) CheckFriendAccess(ND); 10438 10439 FunctionDecl *FD; 10440 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10441 FD = FTD->getTemplatedDecl(); 10442 else 10443 FD = cast<FunctionDecl>(ND); 10444 10445 // Mark templated-scope function declarations as unsupported. 10446 if (FD->getNumTemplateParameterLists()) 10447 FrD->setUnsupportedFriend(true); 10448 } 10449 10450 return ND; 10451} 10452 10453void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10454 AdjustDeclIfTemplate(Dcl); 10455 10456 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10457 if (!Fn) { 10458 Diag(DelLoc, diag::err_deleted_non_function); 10459 return; 10460 } 10461 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10462 // Don't consider the implicit declaration we generate for explicit 10463 // specializations. FIXME: Do not generate these implicit declarations. 10464 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 10465 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 10466 Diag(DelLoc, diag::err_deleted_decl_not_first); 10467 Diag(Prev->getLocation(), diag::note_previous_declaration); 10468 } 10469 // If the declaration wasn't the first, we delete the function anyway for 10470 // recovery. 10471 } 10472 Fn->setDeletedAsWritten(); 10473 10474 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10475 if (!MD) 10476 return; 10477 10478 // A deleted special member function is trivial if the corresponding 10479 // implicitly-declared function would have been. 10480 switch (getSpecialMember(MD)) { 10481 case CXXInvalid: 10482 break; 10483 case CXXDefaultConstructor: 10484 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor()); 10485 break; 10486 case CXXCopyConstructor: 10487 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor()); 10488 break; 10489 case CXXMoveConstructor: 10490 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor()); 10491 break; 10492 case CXXCopyAssignment: 10493 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 10494 break; 10495 case CXXMoveAssignment: 10496 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 10497 break; 10498 case CXXDestructor: 10499 MD->setTrivial(MD->getParent()->hasTrivialDestructor()); 10500 break; 10501 } 10502} 10503 10504void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10505 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10506 10507 if (MD) { 10508 if (MD->getParent()->isDependentType()) { 10509 MD->setDefaulted(); 10510 MD->setExplicitlyDefaulted(); 10511 return; 10512 } 10513 10514 CXXSpecialMember Member = getSpecialMember(MD); 10515 if (Member == CXXInvalid) { 10516 Diag(DefaultLoc, diag::err_default_special_members); 10517 return; 10518 } 10519 10520 MD->setDefaulted(); 10521 MD->setExplicitlyDefaulted(); 10522 10523 // If this definition appears within the record, do the checking when 10524 // the record is complete. 10525 const FunctionDecl *Primary = MD; 10526 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern()) 10527 // Find the uninstantiated declaration that actually had the '= default' 10528 // on it. 10529 Pattern->isDefined(Primary); 10530 10531 if (Primary == Primary->getCanonicalDecl()) 10532 return; 10533 10534 CheckExplicitlyDefaultedSpecialMember(MD); 10535 10536 switch (Member) { 10537 case CXXDefaultConstructor: { 10538 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10539 if (!CD->isInvalidDecl()) 10540 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10541 break; 10542 } 10543 10544 case CXXCopyConstructor: { 10545 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10546 if (!CD->isInvalidDecl()) 10547 DefineImplicitCopyConstructor(DefaultLoc, CD); 10548 break; 10549 } 10550 10551 case CXXCopyAssignment: { 10552 if (!MD->isInvalidDecl()) 10553 DefineImplicitCopyAssignment(DefaultLoc, MD); 10554 break; 10555 } 10556 10557 case CXXDestructor: { 10558 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10559 if (!DD->isInvalidDecl()) 10560 DefineImplicitDestructor(DefaultLoc, DD); 10561 break; 10562 } 10563 10564 case CXXMoveConstructor: { 10565 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10566 if (!CD->isInvalidDecl()) 10567 DefineImplicitMoveConstructor(DefaultLoc, CD); 10568 break; 10569 } 10570 10571 case CXXMoveAssignment: { 10572 if (!MD->isInvalidDecl()) 10573 DefineImplicitMoveAssignment(DefaultLoc, MD); 10574 break; 10575 } 10576 10577 case CXXInvalid: 10578 llvm_unreachable("Invalid special member."); 10579 } 10580 } else { 10581 Diag(DefaultLoc, diag::err_default_special_members); 10582 } 10583} 10584 10585static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10586 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10587 Stmt *SubStmt = *CI; 10588 if (!SubStmt) 10589 continue; 10590 if (isa<ReturnStmt>(SubStmt)) 10591 Self.Diag(SubStmt->getLocStart(), 10592 diag::err_return_in_constructor_handler); 10593 if (!isa<Expr>(SubStmt)) 10594 SearchForReturnInStmt(Self, SubStmt); 10595 } 10596} 10597 10598void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10599 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10600 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10601 SearchForReturnInStmt(*this, Handler); 10602 } 10603} 10604 10605bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10606 const CXXMethodDecl *Old) { 10607 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10608 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10609 10610 if (Context.hasSameType(NewTy, OldTy) || 10611 NewTy->isDependentType() || OldTy->isDependentType()) 10612 return false; 10613 10614 // Check if the return types are covariant 10615 QualType NewClassTy, OldClassTy; 10616 10617 /// Both types must be pointers or references to classes. 10618 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10619 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10620 NewClassTy = NewPT->getPointeeType(); 10621 OldClassTy = OldPT->getPointeeType(); 10622 } 10623 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10624 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10625 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10626 NewClassTy = NewRT->getPointeeType(); 10627 OldClassTy = OldRT->getPointeeType(); 10628 } 10629 } 10630 } 10631 10632 // The return types aren't either both pointers or references to a class type. 10633 if (NewClassTy.isNull()) { 10634 Diag(New->getLocation(), 10635 diag::err_different_return_type_for_overriding_virtual_function) 10636 << New->getDeclName() << NewTy << OldTy; 10637 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10638 10639 return true; 10640 } 10641 10642 // C++ [class.virtual]p6: 10643 // If the return type of D::f differs from the return type of B::f, the 10644 // class type in the return type of D::f shall be complete at the point of 10645 // declaration of D::f or shall be the class type D. 10646 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10647 if (!RT->isBeingDefined() && 10648 RequireCompleteType(New->getLocation(), NewClassTy, 10649 diag::err_covariant_return_incomplete, 10650 New->getDeclName())) 10651 return true; 10652 } 10653 10654 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10655 // Check if the new class derives from the old class. 10656 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10657 Diag(New->getLocation(), 10658 diag::err_covariant_return_not_derived) 10659 << New->getDeclName() << NewTy << OldTy; 10660 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10661 return true; 10662 } 10663 10664 // Check if we the conversion from derived to base is valid. 10665 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10666 diag::err_covariant_return_inaccessible_base, 10667 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10668 // FIXME: Should this point to the return type? 10669 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10670 // FIXME: this note won't trigger for delayed access control 10671 // diagnostics, and it's impossible to get an undelayed error 10672 // here from access control during the original parse because 10673 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10674 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10675 return true; 10676 } 10677 } 10678 10679 // The qualifiers of the return types must be the same. 10680 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10681 Diag(New->getLocation(), 10682 diag::err_covariant_return_type_different_qualifications) 10683 << New->getDeclName() << NewTy << OldTy; 10684 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10685 return true; 10686 }; 10687 10688 10689 // The new class type must have the same or less qualifiers as the old type. 10690 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10691 Diag(New->getLocation(), 10692 diag::err_covariant_return_type_class_type_more_qualified) 10693 << New->getDeclName() << NewTy << OldTy; 10694 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10695 return true; 10696 }; 10697 10698 return false; 10699} 10700 10701/// \brief Mark the given method pure. 10702/// 10703/// \param Method the method to be marked pure. 10704/// 10705/// \param InitRange the source range that covers the "0" initializer. 10706bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10707 SourceLocation EndLoc = InitRange.getEnd(); 10708 if (EndLoc.isValid()) 10709 Method->setRangeEnd(EndLoc); 10710 10711 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10712 Method->setPure(); 10713 return false; 10714 } 10715 10716 if (!Method->isInvalidDecl()) 10717 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10718 << Method->getDeclName() << InitRange; 10719 return true; 10720} 10721 10722/// \brief Determine whether the given declaration is a static data member. 10723static bool isStaticDataMember(Decl *D) { 10724 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10725 if (!Var) 10726 return false; 10727 10728 return Var->isStaticDataMember(); 10729} 10730/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10731/// an initializer for the out-of-line declaration 'Dcl'. The scope 10732/// is a fresh scope pushed for just this purpose. 10733/// 10734/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10735/// static data member of class X, names should be looked up in the scope of 10736/// class X. 10737void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10738 // If there is no declaration, there was an error parsing it. 10739 if (D == 0 || D->isInvalidDecl()) return; 10740 10741 // We should only get called for declarations with scope specifiers, like: 10742 // int foo::bar; 10743 assert(D->isOutOfLine()); 10744 EnterDeclaratorContext(S, D->getDeclContext()); 10745 10746 // If we are parsing the initializer for a static data member, push a 10747 // new expression evaluation context that is associated with this static 10748 // data member. 10749 if (isStaticDataMember(D)) 10750 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10751} 10752 10753/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10754/// initializer for the out-of-line declaration 'D'. 10755void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10756 // If there is no declaration, there was an error parsing it. 10757 if (D == 0 || D->isInvalidDecl()) return; 10758 10759 if (isStaticDataMember(D)) 10760 PopExpressionEvaluationContext(); 10761 10762 assert(D->isOutOfLine()); 10763 ExitDeclaratorContext(S); 10764} 10765 10766/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10767/// C++ if/switch/while/for statement. 10768/// e.g: "if (int x = f()) {...}" 10769DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10770 // C++ 6.4p2: 10771 // The declarator shall not specify a function or an array. 10772 // The type-specifier-seq shall not contain typedef and shall not declare a 10773 // new class or enumeration. 10774 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10775 "Parser allowed 'typedef' as storage class of condition decl."); 10776 10777 Decl *Dcl = ActOnDeclarator(S, D); 10778 if (!Dcl) 10779 return true; 10780 10781 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10782 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10783 << D.getSourceRange(); 10784 return true; 10785 } 10786 10787 return Dcl; 10788} 10789 10790void Sema::LoadExternalVTableUses() { 10791 if (!ExternalSource) 10792 return; 10793 10794 SmallVector<ExternalVTableUse, 4> VTables; 10795 ExternalSource->ReadUsedVTables(VTables); 10796 SmallVector<VTableUse, 4> NewUses; 10797 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10798 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10799 = VTablesUsed.find(VTables[I].Record); 10800 // Even if a definition wasn't required before, it may be required now. 10801 if (Pos != VTablesUsed.end()) { 10802 if (!Pos->second && VTables[I].DefinitionRequired) 10803 Pos->second = true; 10804 continue; 10805 } 10806 10807 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10808 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10809 } 10810 10811 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10812} 10813 10814void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10815 bool DefinitionRequired) { 10816 // Ignore any vtable uses in unevaluated operands or for classes that do 10817 // not have a vtable. 10818 if (!Class->isDynamicClass() || Class->isDependentContext() || 10819 CurContext->isDependentContext() || 10820 ExprEvalContexts.back().Context == Unevaluated) 10821 return; 10822 10823 // Try to insert this class into the map. 10824 LoadExternalVTableUses(); 10825 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10826 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10827 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10828 if (!Pos.second) { 10829 // If we already had an entry, check to see if we are promoting this vtable 10830 // to required a definition. If so, we need to reappend to the VTableUses 10831 // list, since we may have already processed the first entry. 10832 if (DefinitionRequired && !Pos.first->second) { 10833 Pos.first->second = true; 10834 } else { 10835 // Otherwise, we can early exit. 10836 return; 10837 } 10838 } 10839 10840 // Local classes need to have their virtual members marked 10841 // immediately. For all other classes, we mark their virtual members 10842 // at the end of the translation unit. 10843 if (Class->isLocalClass()) 10844 MarkVirtualMembersReferenced(Loc, Class); 10845 else 10846 VTableUses.push_back(std::make_pair(Class, Loc)); 10847} 10848 10849bool Sema::DefineUsedVTables() { 10850 LoadExternalVTableUses(); 10851 if (VTableUses.empty()) 10852 return false; 10853 10854 // Note: The VTableUses vector could grow as a result of marking 10855 // the members of a class as "used", so we check the size each 10856 // time through the loop and prefer indices (which are stable) to 10857 // iterators (which are not). 10858 bool DefinedAnything = false; 10859 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10860 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10861 if (!Class) 10862 continue; 10863 10864 SourceLocation Loc = VTableUses[I].second; 10865 10866 bool DefineVTable = true; 10867 10868 // If this class has a key function, but that key function is 10869 // defined in another translation unit, we don't need to emit the 10870 // vtable even though we're using it. 10871 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10872 if (KeyFunction && !KeyFunction->hasBody()) { 10873 switch (KeyFunction->getTemplateSpecializationKind()) { 10874 case TSK_Undeclared: 10875 case TSK_ExplicitSpecialization: 10876 case TSK_ExplicitInstantiationDeclaration: 10877 // The key function is in another translation unit. 10878 DefineVTable = false; 10879 break; 10880 10881 case TSK_ExplicitInstantiationDefinition: 10882 case TSK_ImplicitInstantiation: 10883 // We will be instantiating the key function. 10884 break; 10885 } 10886 } else if (!KeyFunction) { 10887 // If we have a class with no key function that is the subject 10888 // of an explicit instantiation declaration, suppress the 10889 // vtable; it will live with the explicit instantiation 10890 // definition. 10891 bool IsExplicitInstantiationDeclaration 10892 = Class->getTemplateSpecializationKind() 10893 == TSK_ExplicitInstantiationDeclaration; 10894 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10895 REnd = Class->redecls_end(); 10896 R != REnd; ++R) { 10897 TemplateSpecializationKind TSK 10898 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10899 if (TSK == TSK_ExplicitInstantiationDeclaration) 10900 IsExplicitInstantiationDeclaration = true; 10901 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10902 IsExplicitInstantiationDeclaration = false; 10903 break; 10904 } 10905 } 10906 10907 if (IsExplicitInstantiationDeclaration) 10908 DefineVTable = false; 10909 } 10910 10911 // The exception specifications for all virtual members may be needed even 10912 // if we are not providing an authoritative form of the vtable in this TU. 10913 // We may choose to emit it available_externally anyway. 10914 if (!DefineVTable) { 10915 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 10916 continue; 10917 } 10918 10919 // Mark all of the virtual members of this class as referenced, so 10920 // that we can build a vtable. Then, tell the AST consumer that a 10921 // vtable for this class is required. 10922 DefinedAnything = true; 10923 MarkVirtualMembersReferenced(Loc, Class); 10924 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10925 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10926 10927 // Optionally warn if we're emitting a weak vtable. 10928 if (Class->getLinkage() == ExternalLinkage && 10929 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10930 const FunctionDecl *KeyFunctionDef = 0; 10931 if (!KeyFunction || 10932 (KeyFunction->hasBody(KeyFunctionDef) && 10933 KeyFunctionDef->isInlined())) 10934 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10935 TSK_ExplicitInstantiationDefinition 10936 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10937 << Class; 10938 } 10939 } 10940 VTableUses.clear(); 10941 10942 return DefinedAnything; 10943} 10944 10945void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 10946 const CXXRecordDecl *RD) { 10947 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 10948 E = RD->method_end(); I != E; ++I) 10949 if ((*I)->isVirtual() && !(*I)->isPure()) 10950 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 10951} 10952 10953void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10954 const CXXRecordDecl *RD) { 10955 // Mark all functions which will appear in RD's vtable as used. 10956 CXXFinalOverriderMap FinalOverriders; 10957 RD->getFinalOverriders(FinalOverriders); 10958 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 10959 E = FinalOverriders.end(); 10960 I != E; ++I) { 10961 for (OverridingMethods::const_iterator OI = I->second.begin(), 10962 OE = I->second.end(); 10963 OI != OE; ++OI) { 10964 assert(OI->second.size() > 0 && "no final overrider"); 10965 CXXMethodDecl *Overrider = OI->second.front().Method; 10966 10967 // C++ [basic.def.odr]p2: 10968 // [...] A virtual member function is used if it is not pure. [...] 10969 if (!Overrider->isPure()) 10970 MarkFunctionReferenced(Loc, Overrider); 10971 } 10972 } 10973 10974 // Only classes that have virtual bases need a VTT. 10975 if (RD->getNumVBases() == 0) 10976 return; 10977 10978 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10979 e = RD->bases_end(); i != e; ++i) { 10980 const CXXRecordDecl *Base = 10981 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10982 if (Base->getNumVBases() == 0) 10983 continue; 10984 MarkVirtualMembersReferenced(Loc, Base); 10985 } 10986} 10987 10988/// SetIvarInitializers - This routine builds initialization ASTs for the 10989/// Objective-C implementation whose ivars need be initialized. 10990void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10991 if (!getLangOpts().CPlusPlus) 10992 return; 10993 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10994 SmallVector<ObjCIvarDecl*, 8> ivars; 10995 CollectIvarsToConstructOrDestruct(OID, ivars); 10996 if (ivars.empty()) 10997 return; 10998 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10999 for (unsigned i = 0; i < ivars.size(); i++) { 11000 FieldDecl *Field = ivars[i]; 11001 if (Field->isInvalidDecl()) 11002 continue; 11003 11004 CXXCtorInitializer *Member; 11005 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 11006 InitializationKind InitKind = 11007 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 11008 11009 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 11010 ExprResult MemberInit = 11011 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 11012 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 11013 // Note, MemberInit could actually come back empty if no initialization 11014 // is required (e.g., because it would call a trivial default constructor) 11015 if (!MemberInit.get() || MemberInit.isInvalid()) 11016 continue; 11017 11018 Member = 11019 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 11020 SourceLocation(), 11021 MemberInit.takeAs<Expr>(), 11022 SourceLocation()); 11023 AllToInit.push_back(Member); 11024 11025 // Be sure that the destructor is accessible and is marked as referenced. 11026 if (const RecordType *RecordTy 11027 = Context.getBaseElementType(Field->getType()) 11028 ->getAs<RecordType>()) { 11029 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 11030 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 11031 MarkFunctionReferenced(Field->getLocation(), Destructor); 11032 CheckDestructorAccess(Field->getLocation(), Destructor, 11033 PDiag(diag::err_access_dtor_ivar) 11034 << Context.getBaseElementType(Field->getType())); 11035 } 11036 } 11037 } 11038 ObjCImplementation->setIvarInitializers(Context, 11039 AllToInit.data(), AllToInit.size()); 11040 } 11041} 11042 11043static 11044void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 11045 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 11046 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 11047 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 11048 Sema &S) { 11049 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11050 CE = Current.end(); 11051 if (Ctor->isInvalidDecl()) 11052 return; 11053 11054 CXXConstructorDecl *Target = Ctor->getTargetConstructor(); 11055 11056 // Target may not be determinable yet, for instance if this is a dependent 11057 // call in an uninstantiated template. 11058 if (Target) { 11059 const FunctionDecl *FNTarget = 0; 11060 (void)Target->hasBody(FNTarget); 11061 Target = const_cast<CXXConstructorDecl*>( 11062 cast_or_null<CXXConstructorDecl>(FNTarget)); 11063 } 11064 11065 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 11066 // Avoid dereferencing a null pointer here. 11067 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 11068 11069 if (!Current.insert(Canonical)) 11070 return; 11071 11072 // We know that beyond here, we aren't chaining into a cycle. 11073 if (!Target || !Target->isDelegatingConstructor() || 11074 Target->isInvalidDecl() || Valid.count(TCanonical)) { 11075 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11076 Valid.insert(*CI); 11077 Current.clear(); 11078 // We've hit a cycle. 11079 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 11080 Current.count(TCanonical)) { 11081 // If we haven't diagnosed this cycle yet, do so now. 11082 if (!Invalid.count(TCanonical)) { 11083 S.Diag((*Ctor->init_begin())->getSourceLocation(), 11084 diag::warn_delegating_ctor_cycle) 11085 << Ctor; 11086 11087 // Don't add a note for a function delegating directly to itself. 11088 if (TCanonical != Canonical) 11089 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11090 11091 CXXConstructorDecl *C = Target; 11092 while (C->getCanonicalDecl() != Canonical) { 11093 const FunctionDecl *FNTarget = 0; 11094 (void)C->getTargetConstructor()->hasBody(FNTarget); 11095 assert(FNTarget && "Ctor cycle through bodiless function"); 11096 11097 C = const_cast<CXXConstructorDecl*>( 11098 cast<CXXConstructorDecl>(FNTarget)); 11099 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11100 } 11101 } 11102 11103 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11104 Invalid.insert(*CI); 11105 Current.clear(); 11106 } else { 11107 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11108 } 11109} 11110 11111 11112void Sema::CheckDelegatingCtorCycles() { 11113 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11114 11115 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11116 CE = Current.end(); 11117 11118 for (DelegatingCtorDeclsType::iterator 11119 I = DelegatingCtorDecls.begin(ExternalSource), 11120 E = DelegatingCtorDecls.end(); 11121 I != E; ++I) 11122 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11123 11124 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11125 (*CI)->setInvalidDecl(); 11126} 11127 11128namespace { 11129 /// \brief AST visitor that finds references to the 'this' expression. 11130 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 11131 Sema &S; 11132 11133 public: 11134 explicit FindCXXThisExpr(Sema &S) : S(S) { } 11135 11136 bool VisitCXXThisExpr(CXXThisExpr *E) { 11137 S.Diag(E->getLocation(), diag::err_this_static_member_func) 11138 << E->isImplicit(); 11139 return false; 11140 } 11141 }; 11142} 11143 11144bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 11145 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11146 if (!TSInfo) 11147 return false; 11148 11149 TypeLoc TL = TSInfo->getTypeLoc(); 11150 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11151 if (!ProtoTL) 11152 return false; 11153 11154 // C++11 [expr.prim.general]p3: 11155 // [The expression this] shall not appear before the optional 11156 // cv-qualifier-seq and it shall not appear within the declaration of a 11157 // static member function (although its type and value category are defined 11158 // within a static member function as they are within a non-static member 11159 // function). [ Note: this is because declaration matching does not occur 11160 // until the complete declarator is known. - end note ] 11161 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11162 FindCXXThisExpr Finder(*this); 11163 11164 // If the return type came after the cv-qualifier-seq, check it now. 11165 if (Proto->hasTrailingReturn() && 11166 !Finder.TraverseTypeLoc(ProtoTL->getResultLoc())) 11167 return true; 11168 11169 // Check the exception specification. 11170 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 11171 return true; 11172 11173 return checkThisInStaticMemberFunctionAttributes(Method); 11174} 11175 11176bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 11177 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11178 if (!TSInfo) 11179 return false; 11180 11181 TypeLoc TL = TSInfo->getTypeLoc(); 11182 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11183 if (!ProtoTL) 11184 return false; 11185 11186 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11187 FindCXXThisExpr Finder(*this); 11188 11189 switch (Proto->getExceptionSpecType()) { 11190 case EST_Uninstantiated: 11191 case EST_Unevaluated: 11192 case EST_BasicNoexcept: 11193 case EST_DynamicNone: 11194 case EST_MSAny: 11195 case EST_None: 11196 break; 11197 11198 case EST_ComputedNoexcept: 11199 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11200 return true; 11201 11202 case EST_Dynamic: 11203 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11204 EEnd = Proto->exception_end(); 11205 E != EEnd; ++E) { 11206 if (!Finder.TraverseType(*E)) 11207 return true; 11208 } 11209 break; 11210 } 11211 11212 return false; 11213} 11214 11215bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11216 FindCXXThisExpr Finder(*this); 11217 11218 // Check attributes. 11219 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11220 A != AEnd; ++A) { 11221 // FIXME: This should be emitted by tblgen. 11222 Expr *Arg = 0; 11223 ArrayRef<Expr *> Args; 11224 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11225 Arg = G->getArg(); 11226 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11227 Arg = G->getArg(); 11228 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11229 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11230 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11231 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11232 else if (ExclusiveLockFunctionAttr *ELF 11233 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11234 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11235 else if (SharedLockFunctionAttr *SLF 11236 = dyn_cast<SharedLockFunctionAttr>(*A)) 11237 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11238 else if (ExclusiveTrylockFunctionAttr *ETLF 11239 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11240 Arg = ETLF->getSuccessValue(); 11241 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11242 } else if (SharedTrylockFunctionAttr *STLF 11243 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11244 Arg = STLF->getSuccessValue(); 11245 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11246 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11247 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11248 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11249 Arg = LR->getArg(); 11250 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11251 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11252 else if (ExclusiveLocksRequiredAttr *ELR 11253 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11254 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11255 else if (SharedLocksRequiredAttr *SLR 11256 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11257 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11258 11259 if (Arg && !Finder.TraverseStmt(Arg)) 11260 return true; 11261 11262 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11263 if (!Finder.TraverseStmt(Args[I])) 11264 return true; 11265 } 11266 } 11267 11268 return false; 11269} 11270 11271void 11272Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 11273 ArrayRef<ParsedType> DynamicExceptions, 11274 ArrayRef<SourceRange> DynamicExceptionRanges, 11275 Expr *NoexceptExpr, 11276 llvm::SmallVectorImpl<QualType> &Exceptions, 11277 FunctionProtoType::ExtProtoInfo &EPI) { 11278 Exceptions.clear(); 11279 EPI.ExceptionSpecType = EST; 11280 if (EST == EST_Dynamic) { 11281 Exceptions.reserve(DynamicExceptions.size()); 11282 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 11283 // FIXME: Preserve type source info. 11284 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 11285 11286 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 11287 collectUnexpandedParameterPacks(ET, Unexpanded); 11288 if (!Unexpanded.empty()) { 11289 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 11290 UPPC_ExceptionType, 11291 Unexpanded); 11292 continue; 11293 } 11294 11295 // Check that the type is valid for an exception spec, and 11296 // drop it if not. 11297 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 11298 Exceptions.push_back(ET); 11299 } 11300 EPI.NumExceptions = Exceptions.size(); 11301 EPI.Exceptions = Exceptions.data(); 11302 return; 11303 } 11304 11305 if (EST == EST_ComputedNoexcept) { 11306 // If an error occurred, there's no expression here. 11307 if (NoexceptExpr) { 11308 assert((NoexceptExpr->isTypeDependent() || 11309 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 11310 Context.BoolTy) && 11311 "Parser should have made sure that the expression is boolean"); 11312 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 11313 EPI.ExceptionSpecType = EST_BasicNoexcept; 11314 return; 11315 } 11316 11317 if (!NoexceptExpr->isValueDependent()) 11318 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 11319 diag::err_noexcept_needs_constant_expression, 11320 /*AllowFold*/ false).take(); 11321 EPI.NoexceptExpr = NoexceptExpr; 11322 } 11323 return; 11324 } 11325} 11326 11327/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11328Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11329 // Implicitly declared functions (e.g. copy constructors) are 11330 // __host__ __device__ 11331 if (D->isImplicit()) 11332 return CFT_HostDevice; 11333 11334 if (D->hasAttr<CUDAGlobalAttr>()) 11335 return CFT_Global; 11336 11337 if (D->hasAttr<CUDADeviceAttr>()) { 11338 if (D->hasAttr<CUDAHostAttr>()) 11339 return CFT_HostDevice; 11340 else 11341 return CFT_Device; 11342 } 11343 11344 return CFT_Host; 11345} 11346 11347bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11348 CUDAFunctionTarget CalleeTarget) { 11349 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11350 // Callable from the device only." 11351 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11352 return true; 11353 11354 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11355 // Callable from the host only." 11356 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11357 // Callable from the host only." 11358 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11359 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11360 return true; 11361 11362 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11363 return true; 11364 11365 return false; 11366} 11367