SemaDeclCXX.cpp revision 72190da43924db7d0238fe5c696ecab2bb5bf196
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/AST/ASTConsumer.h" 16#include "clang/AST/ASTContext.h" 17#include "clang/AST/ASTMutationListener.h" 18#include "clang/AST/CXXInheritance.h" 19#include "clang/AST/CharUnits.h" 20#include "clang/AST/DeclVisitor.h" 21#include "clang/AST/EvaluatedExprVisitor.h" 22#include "clang/AST/ExprCXX.h" 23#include "clang/AST/RecordLayout.h" 24#include "clang/AST/RecursiveASTVisitor.h" 25#include "clang/AST/StmtVisitor.h" 26#include "clang/AST/TypeLoc.h" 27#include "clang/AST/TypeOrdering.h" 28#include "clang/Basic/PartialDiagnostic.h" 29#include "clang/Basic/TargetInfo.h" 30#include "clang/Lex/Preprocessor.h" 31#include "clang/Sema/CXXFieldCollector.h" 32#include "clang/Sema/DeclSpec.h" 33#include "clang/Sema/Initialization.h" 34#include "clang/Sema/Lookup.h" 35#include "clang/Sema/ParsedTemplate.h" 36#include "clang/Sema/Scope.h" 37#include "clang/Sema/ScopeInfo.h" 38#include "llvm/ADT/STLExtras.h" 39#include "llvm/ADT/SmallString.h" 40#include <map> 41#include <set> 42 43using namespace clang; 44 45//===----------------------------------------------------------------------===// 46// CheckDefaultArgumentVisitor 47//===----------------------------------------------------------------------===// 48 49namespace { 50 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 51 /// the default argument of a parameter to determine whether it 52 /// contains any ill-formed subexpressions. For example, this will 53 /// diagnose the use of local variables or parameters within the 54 /// default argument expression. 55 class CheckDefaultArgumentVisitor 56 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 57 Expr *DefaultArg; 58 Sema *S; 59 60 public: 61 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 62 : DefaultArg(defarg), S(s) {} 63 64 bool VisitExpr(Expr *Node); 65 bool VisitDeclRefExpr(DeclRefExpr *DRE); 66 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 67 bool VisitLambdaExpr(LambdaExpr *Lambda); 68 }; 69 70 /// VisitExpr - Visit all of the children of this expression. 71 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 72 bool IsInvalid = false; 73 for (Stmt::child_range I = Node->children(); I; ++I) 74 IsInvalid |= Visit(*I); 75 return IsInvalid; 76 } 77 78 /// VisitDeclRefExpr - Visit a reference to a declaration, to 79 /// determine whether this declaration can be used in the default 80 /// argument expression. 81 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 82 NamedDecl *Decl = DRE->getDecl(); 83 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 84 // C++ [dcl.fct.default]p9 85 // Default arguments are evaluated each time the function is 86 // called. The order of evaluation of function arguments is 87 // unspecified. Consequently, parameters of a function shall not 88 // be used in default argument expressions, even if they are not 89 // evaluated. Parameters of a function declared before a default 90 // argument expression are in scope and can hide namespace and 91 // class member names. 92 return S->Diag(DRE->getLocStart(), 93 diag::err_param_default_argument_references_param) 94 << Param->getDeclName() << DefaultArg->getSourceRange(); 95 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 96 // C++ [dcl.fct.default]p7 97 // Local variables shall not be used in default argument 98 // expressions. 99 if (VDecl->isLocalVarDecl()) 100 return S->Diag(DRE->getLocStart(), 101 diag::err_param_default_argument_references_local) 102 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 103 } 104 105 return false; 106 } 107 108 /// VisitCXXThisExpr - Visit a C++ "this" expression. 109 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 110 // C++ [dcl.fct.default]p8: 111 // The keyword this shall not be used in a default argument of a 112 // member function. 113 return S->Diag(ThisE->getLocStart(), 114 diag::err_param_default_argument_references_this) 115 << ThisE->getSourceRange(); 116 } 117 118 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 119 // C++11 [expr.lambda.prim]p13: 120 // A lambda-expression appearing in a default argument shall not 121 // implicitly or explicitly capture any entity. 122 if (Lambda->capture_begin() == Lambda->capture_end()) 123 return false; 124 125 return S->Diag(Lambda->getLocStart(), 126 diag::err_lambda_capture_default_arg); 127 } 128} 129 130void Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, 131 CXXMethodDecl *Method) { 132 // If we have an MSAny spec already, don't bother. 133 if (!Method || ComputedEST == EST_MSAny) 134 return; 135 136 const FunctionProtoType *Proto 137 = Method->getType()->getAs<FunctionProtoType>(); 138 Proto = Self->ResolveExceptionSpec(CallLoc, Proto); 139 if (!Proto) 140 return; 141 142 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 143 144 // If this function can throw any exceptions, make a note of that. 145 if (EST == EST_MSAny || EST == EST_None) { 146 ClearExceptions(); 147 ComputedEST = EST; 148 return; 149 } 150 151 // FIXME: If the call to this decl is using any of its default arguments, we 152 // need to search them for potentially-throwing calls. 153 154 // If this function has a basic noexcept, it doesn't affect the outcome. 155 if (EST == EST_BasicNoexcept) 156 return; 157 158 // If we have a throw-all spec at this point, ignore the function. 159 if (ComputedEST == EST_None) 160 return; 161 162 // If we're still at noexcept(true) and there's a nothrow() callee, 163 // change to that specification. 164 if (EST == EST_DynamicNone) { 165 if (ComputedEST == EST_BasicNoexcept) 166 ComputedEST = EST_DynamicNone; 167 return; 168 } 169 170 // Check out noexcept specs. 171 if (EST == EST_ComputedNoexcept) { 172 FunctionProtoType::NoexceptResult NR = 173 Proto->getNoexceptSpec(Self->Context); 174 assert(NR != FunctionProtoType::NR_NoNoexcept && 175 "Must have noexcept result for EST_ComputedNoexcept."); 176 assert(NR != FunctionProtoType::NR_Dependent && 177 "Should not generate implicit declarations for dependent cases, " 178 "and don't know how to handle them anyway."); 179 180 // noexcept(false) -> no spec on the new function 181 if (NR == FunctionProtoType::NR_Throw) { 182 ClearExceptions(); 183 ComputedEST = EST_None; 184 } 185 // noexcept(true) won't change anything either. 186 return; 187 } 188 189 assert(EST == EST_Dynamic && "EST case not considered earlier."); 190 assert(ComputedEST != EST_None && 191 "Shouldn't collect exceptions when throw-all is guaranteed."); 192 ComputedEST = EST_Dynamic; 193 // Record the exceptions in this function's exception specification. 194 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 195 EEnd = Proto->exception_end(); 196 E != EEnd; ++E) 197 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E))) 198 Exceptions.push_back(*E); 199} 200 201void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 202 if (!E || ComputedEST == EST_MSAny) 203 return; 204 205 // FIXME: 206 // 207 // C++0x [except.spec]p14: 208 // [An] implicit exception-specification specifies the type-id T if and 209 // only if T is allowed by the exception-specification of a function directly 210 // invoked by f's implicit definition; f shall allow all exceptions if any 211 // function it directly invokes allows all exceptions, and f shall allow no 212 // exceptions if every function it directly invokes allows no exceptions. 213 // 214 // Note in particular that if an implicit exception-specification is generated 215 // for a function containing a throw-expression, that specification can still 216 // be noexcept(true). 217 // 218 // Note also that 'directly invoked' is not defined in the standard, and there 219 // is no indication that we should only consider potentially-evaluated calls. 220 // 221 // Ultimately we should implement the intent of the standard: the exception 222 // specification should be the set of exceptions which can be thrown by the 223 // implicit definition. For now, we assume that any non-nothrow expression can 224 // throw any exception. 225 226 if (Self->canThrow(E)) 227 ComputedEST = EST_None; 228} 229 230bool 231Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 232 SourceLocation EqualLoc) { 233 if (RequireCompleteType(Param->getLocation(), Param->getType(), 234 diag::err_typecheck_decl_incomplete_type)) { 235 Param->setInvalidDecl(); 236 return true; 237 } 238 239 // C++ [dcl.fct.default]p5 240 // A default argument expression is implicitly converted (clause 241 // 4) to the parameter type. The default argument expression has 242 // the same semantic constraints as the initializer expression in 243 // a declaration of a variable of the parameter type, using the 244 // copy-initialization semantics (8.5). 245 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 246 Param); 247 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 248 EqualLoc); 249 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 250 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg); 251 if (Result.isInvalid()) 252 return true; 253 Arg = Result.takeAs<Expr>(); 254 255 CheckCompletedExpr(Arg, EqualLoc); 256 Arg = MaybeCreateExprWithCleanups(Arg); 257 258 // Okay: add the default argument to the parameter 259 Param->setDefaultArg(Arg); 260 261 // We have already instantiated this parameter; provide each of the 262 // instantiations with the uninstantiated default argument. 263 UnparsedDefaultArgInstantiationsMap::iterator InstPos 264 = UnparsedDefaultArgInstantiations.find(Param); 265 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 266 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 267 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 268 269 // We're done tracking this parameter's instantiations. 270 UnparsedDefaultArgInstantiations.erase(InstPos); 271 } 272 273 return false; 274} 275 276/// ActOnParamDefaultArgument - Check whether the default argument 277/// provided for a function parameter is well-formed. If so, attach it 278/// to the parameter declaration. 279void 280Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 281 Expr *DefaultArg) { 282 if (!param || !DefaultArg) 283 return; 284 285 ParmVarDecl *Param = cast<ParmVarDecl>(param); 286 UnparsedDefaultArgLocs.erase(Param); 287 288 // Default arguments are only permitted in C++ 289 if (!getLangOpts().CPlusPlus) { 290 Diag(EqualLoc, diag::err_param_default_argument) 291 << DefaultArg->getSourceRange(); 292 Param->setInvalidDecl(); 293 return; 294 } 295 296 // Check for unexpanded parameter packs. 297 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 298 Param->setInvalidDecl(); 299 return; 300 } 301 302 // Check that the default argument is well-formed 303 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 304 if (DefaultArgChecker.Visit(DefaultArg)) { 305 Param->setInvalidDecl(); 306 return; 307 } 308 309 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 310} 311 312/// ActOnParamUnparsedDefaultArgument - We've seen a default 313/// argument for a function parameter, but we can't parse it yet 314/// because we're inside a class definition. Note that this default 315/// argument will be parsed later. 316void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 317 SourceLocation EqualLoc, 318 SourceLocation ArgLoc) { 319 if (!param) 320 return; 321 322 ParmVarDecl *Param = cast<ParmVarDecl>(param); 323 if (Param) 324 Param->setUnparsedDefaultArg(); 325 326 UnparsedDefaultArgLocs[Param] = ArgLoc; 327} 328 329/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 330/// the default argument for the parameter param failed. 331void Sema::ActOnParamDefaultArgumentError(Decl *param) { 332 if (!param) 333 return; 334 335 ParmVarDecl *Param = cast<ParmVarDecl>(param); 336 337 Param->setInvalidDecl(); 338 339 UnparsedDefaultArgLocs.erase(Param); 340} 341 342/// CheckExtraCXXDefaultArguments - Check for any extra default 343/// arguments in the declarator, which is not a function declaration 344/// or definition and therefore is not permitted to have default 345/// arguments. This routine should be invoked for every declarator 346/// that is not a function declaration or definition. 347void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 348 // C++ [dcl.fct.default]p3 349 // A default argument expression shall be specified only in the 350 // parameter-declaration-clause of a function declaration or in a 351 // template-parameter (14.1). It shall not be specified for a 352 // parameter pack. If it is specified in a 353 // parameter-declaration-clause, it shall not occur within a 354 // declarator or abstract-declarator of a parameter-declaration. 355 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 356 DeclaratorChunk &chunk = D.getTypeObject(i); 357 if (chunk.Kind == DeclaratorChunk::Function) { 358 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 359 ParmVarDecl *Param = 360 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 361 if (Param->hasUnparsedDefaultArg()) { 362 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 363 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 364 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 365 delete Toks; 366 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 367 } else if (Param->getDefaultArg()) { 368 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 369 << Param->getDefaultArg()->getSourceRange(); 370 Param->setDefaultArg(0); 371 } 372 } 373 } 374 } 375} 376 377/// MergeCXXFunctionDecl - Merge two declarations of the same C++ 378/// function, once we already know that they have the same 379/// type. Subroutine of MergeFunctionDecl. Returns true if there was an 380/// error, false otherwise. 381bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, 382 Scope *S) { 383 bool Invalid = false; 384 385 // C++ [dcl.fct.default]p4: 386 // For non-template functions, default arguments can be added in 387 // later declarations of a function in the same 388 // scope. Declarations in different scopes have completely 389 // distinct sets of default arguments. That is, declarations in 390 // inner scopes do not acquire default arguments from 391 // declarations in outer scopes, and vice versa. In a given 392 // function declaration, all parameters subsequent to a 393 // parameter with a default argument shall have default 394 // arguments supplied in this or previous declarations. A 395 // default argument shall not be redefined by a later 396 // declaration (not even to the same value). 397 // 398 // C++ [dcl.fct.default]p6: 399 // Except for member functions of class templates, the default arguments 400 // in a member function definition that appears outside of the class 401 // definition are added to the set of default arguments provided by the 402 // member function declaration in the class definition. 403 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 404 ParmVarDecl *OldParam = Old->getParamDecl(p); 405 ParmVarDecl *NewParam = New->getParamDecl(p); 406 407 bool OldParamHasDfl = OldParam->hasDefaultArg(); 408 bool NewParamHasDfl = NewParam->hasDefaultArg(); 409 410 NamedDecl *ND = Old; 411 if (S && !isDeclInScope(ND, New->getDeclContext(), S)) 412 // Ignore default parameters of old decl if they are not in 413 // the same scope. 414 OldParamHasDfl = false; 415 416 if (OldParamHasDfl && NewParamHasDfl) { 417 418 unsigned DiagDefaultParamID = 419 diag::err_param_default_argument_redefinition; 420 421 // MSVC accepts that default parameters be redefined for member functions 422 // of template class. The new default parameter's value is ignored. 423 Invalid = true; 424 if (getLangOpts().MicrosoftExt) { 425 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 426 if (MD && MD->getParent()->getDescribedClassTemplate()) { 427 // Merge the old default argument into the new parameter. 428 NewParam->setHasInheritedDefaultArg(); 429 if (OldParam->hasUninstantiatedDefaultArg()) 430 NewParam->setUninstantiatedDefaultArg( 431 OldParam->getUninstantiatedDefaultArg()); 432 else 433 NewParam->setDefaultArg(OldParam->getInit()); 434 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 435 Invalid = false; 436 } 437 } 438 439 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 440 // hint here. Alternatively, we could walk the type-source information 441 // for NewParam to find the last source location in the type... but it 442 // isn't worth the effort right now. This is the kind of test case that 443 // is hard to get right: 444 // int f(int); 445 // void g(int (*fp)(int) = f); 446 // void g(int (*fp)(int) = &f); 447 Diag(NewParam->getLocation(), DiagDefaultParamID) 448 << NewParam->getDefaultArgRange(); 449 450 // Look for the function declaration where the default argument was 451 // actually written, which may be a declaration prior to Old. 452 for (FunctionDecl *Older = Old->getPreviousDecl(); 453 Older; Older = Older->getPreviousDecl()) { 454 if (!Older->getParamDecl(p)->hasDefaultArg()) 455 break; 456 457 OldParam = Older->getParamDecl(p); 458 } 459 460 Diag(OldParam->getLocation(), diag::note_previous_definition) 461 << OldParam->getDefaultArgRange(); 462 } else if (OldParamHasDfl) { 463 // Merge the old default argument into the new parameter. 464 // It's important to use getInit() here; getDefaultArg() 465 // strips off any top-level ExprWithCleanups. 466 NewParam->setHasInheritedDefaultArg(); 467 if (OldParam->hasUninstantiatedDefaultArg()) 468 NewParam->setUninstantiatedDefaultArg( 469 OldParam->getUninstantiatedDefaultArg()); 470 else 471 NewParam->setDefaultArg(OldParam->getInit()); 472 } else if (NewParamHasDfl) { 473 if (New->getDescribedFunctionTemplate()) { 474 // Paragraph 4, quoted above, only applies to non-template functions. 475 Diag(NewParam->getLocation(), 476 diag::err_param_default_argument_template_redecl) 477 << NewParam->getDefaultArgRange(); 478 Diag(Old->getLocation(), diag::note_template_prev_declaration) 479 << false; 480 } else if (New->getTemplateSpecializationKind() 481 != TSK_ImplicitInstantiation && 482 New->getTemplateSpecializationKind() != TSK_Undeclared) { 483 // C++ [temp.expr.spec]p21: 484 // Default function arguments shall not be specified in a declaration 485 // or a definition for one of the following explicit specializations: 486 // - the explicit specialization of a function template; 487 // - the explicit specialization of a member function template; 488 // - the explicit specialization of a member function of a class 489 // template where the class template specialization to which the 490 // member function specialization belongs is implicitly 491 // instantiated. 492 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 493 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 494 << New->getDeclName() 495 << NewParam->getDefaultArgRange(); 496 } else if (New->getDeclContext()->isDependentContext()) { 497 // C++ [dcl.fct.default]p6 (DR217): 498 // Default arguments for a member function of a class template shall 499 // be specified on the initial declaration of the member function 500 // within the class template. 501 // 502 // Reading the tea leaves a bit in DR217 and its reference to DR205 503 // leads me to the conclusion that one cannot add default function 504 // arguments for an out-of-line definition of a member function of a 505 // dependent type. 506 int WhichKind = 2; 507 if (CXXRecordDecl *Record 508 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 509 if (Record->getDescribedClassTemplate()) 510 WhichKind = 0; 511 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 512 WhichKind = 1; 513 else 514 WhichKind = 2; 515 } 516 517 Diag(NewParam->getLocation(), 518 diag::err_param_default_argument_member_template_redecl) 519 << WhichKind 520 << NewParam->getDefaultArgRange(); 521 } 522 } 523 } 524 525 // DR1344: If a default argument is added outside a class definition and that 526 // default argument makes the function a special member function, the program 527 // is ill-formed. This can only happen for constructors. 528 if (isa<CXXConstructorDecl>(New) && 529 New->getMinRequiredArguments() < Old->getMinRequiredArguments()) { 530 CXXSpecialMember NewSM = getSpecialMember(cast<CXXMethodDecl>(New)), 531 OldSM = getSpecialMember(cast<CXXMethodDecl>(Old)); 532 if (NewSM != OldSM) { 533 ParmVarDecl *NewParam = New->getParamDecl(New->getMinRequiredArguments()); 534 assert(NewParam->hasDefaultArg()); 535 Diag(NewParam->getLocation(), diag::err_default_arg_makes_ctor_special) 536 << NewParam->getDefaultArgRange() << NewSM; 537 Diag(Old->getLocation(), diag::note_previous_declaration); 538 } 539 } 540 541 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 542 // template has a constexpr specifier then all its declarations shall 543 // contain the constexpr specifier. 544 if (New->isConstexpr() != Old->isConstexpr()) { 545 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 546 << New << New->isConstexpr(); 547 Diag(Old->getLocation(), diag::note_previous_declaration); 548 Invalid = true; 549 } 550 551 if (CheckEquivalentExceptionSpec(Old, New)) 552 Invalid = true; 553 554 return Invalid; 555} 556 557/// \brief Merge the exception specifications of two variable declarations. 558/// 559/// This is called when there's a redeclaration of a VarDecl. The function 560/// checks if the redeclaration might have an exception specification and 561/// validates compatibility and merges the specs if necessary. 562void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 563 // Shortcut if exceptions are disabled. 564 if (!getLangOpts().CXXExceptions) 565 return; 566 567 assert(Context.hasSameType(New->getType(), Old->getType()) && 568 "Should only be called if types are otherwise the same."); 569 570 QualType NewType = New->getType(); 571 QualType OldType = Old->getType(); 572 573 // We're only interested in pointers and references to functions, as well 574 // as pointers to member functions. 575 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 576 NewType = R->getPointeeType(); 577 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 578 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 579 NewType = P->getPointeeType(); 580 OldType = OldType->getAs<PointerType>()->getPointeeType(); 581 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 582 NewType = M->getPointeeType(); 583 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 584 } 585 586 if (!NewType->isFunctionProtoType()) 587 return; 588 589 // There's lots of special cases for functions. For function pointers, system 590 // libraries are hopefully not as broken so that we don't need these 591 // workarounds. 592 if (CheckEquivalentExceptionSpec( 593 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 594 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 595 New->setInvalidDecl(); 596 } 597} 598 599/// CheckCXXDefaultArguments - Verify that the default arguments for a 600/// function declaration are well-formed according to C++ 601/// [dcl.fct.default]. 602void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 603 unsigned NumParams = FD->getNumParams(); 604 unsigned p; 605 606 bool IsLambda = FD->getOverloadedOperator() == OO_Call && 607 isa<CXXMethodDecl>(FD) && 608 cast<CXXMethodDecl>(FD)->getParent()->isLambda(); 609 610 // Find first parameter with a default argument 611 for (p = 0; p < NumParams; ++p) { 612 ParmVarDecl *Param = FD->getParamDecl(p); 613 if (Param->hasDefaultArg()) { 614 // C++11 [expr.prim.lambda]p5: 615 // [...] Default arguments (8.3.6) shall not be specified in the 616 // parameter-declaration-clause of a lambda-declarator. 617 // 618 // FIXME: Core issue 974 strikes this sentence, we only provide an 619 // extension warning. 620 if (IsLambda) 621 Diag(Param->getLocation(), diag::ext_lambda_default_arguments) 622 << Param->getDefaultArgRange(); 623 break; 624 } 625 } 626 627 // C++ [dcl.fct.default]p4: 628 // In a given function declaration, all parameters 629 // subsequent to a parameter with a default argument shall 630 // have default arguments supplied in this or previous 631 // declarations. A default argument shall not be redefined 632 // by a later declaration (not even to the same value). 633 unsigned LastMissingDefaultArg = 0; 634 for (; p < NumParams; ++p) { 635 ParmVarDecl *Param = FD->getParamDecl(p); 636 if (!Param->hasDefaultArg()) { 637 if (Param->isInvalidDecl()) 638 /* We already complained about this parameter. */; 639 else if (Param->getIdentifier()) 640 Diag(Param->getLocation(), 641 diag::err_param_default_argument_missing_name) 642 << Param->getIdentifier(); 643 else 644 Diag(Param->getLocation(), 645 diag::err_param_default_argument_missing); 646 647 LastMissingDefaultArg = p; 648 } 649 } 650 651 if (LastMissingDefaultArg > 0) { 652 // Some default arguments were missing. Clear out all of the 653 // default arguments up to (and including) the last missing 654 // default argument, so that we leave the function parameters 655 // in a semantically valid state. 656 for (p = 0; p <= LastMissingDefaultArg; ++p) { 657 ParmVarDecl *Param = FD->getParamDecl(p); 658 if (Param->hasDefaultArg()) { 659 Param->setDefaultArg(0); 660 } 661 } 662 } 663} 664 665// CheckConstexprParameterTypes - Check whether a function's parameter types 666// are all literal types. If so, return true. If not, produce a suitable 667// diagnostic and return false. 668static bool CheckConstexprParameterTypes(Sema &SemaRef, 669 const FunctionDecl *FD) { 670 unsigned ArgIndex = 0; 671 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 672 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 673 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 674 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 675 SourceLocation ParamLoc = PD->getLocation(); 676 if (!(*i)->isDependentType() && 677 SemaRef.RequireLiteralType(ParamLoc, *i, 678 diag::err_constexpr_non_literal_param, 679 ArgIndex+1, PD->getSourceRange(), 680 isa<CXXConstructorDecl>(FD))) 681 return false; 682 } 683 return true; 684} 685 686/// \brief Get diagnostic %select index for tag kind for 687/// record diagnostic message. 688/// WARNING: Indexes apply to particular diagnostics only! 689/// 690/// \returns diagnostic %select index. 691static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) { 692 switch (Tag) { 693 case TTK_Struct: return 0; 694 case TTK_Interface: return 1; 695 case TTK_Class: return 2; 696 default: llvm_unreachable("Invalid tag kind for record diagnostic!"); 697 } 698} 699 700// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 701// the requirements of a constexpr function definition or a constexpr 702// constructor definition. If so, return true. If not, produce appropriate 703// diagnostics and return false. 704// 705// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 706bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 707 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 708 if (MD && MD->isInstance()) { 709 // C++11 [dcl.constexpr]p4: 710 // The definition of a constexpr constructor shall satisfy the following 711 // constraints: 712 // - the class shall not have any virtual base classes; 713 const CXXRecordDecl *RD = MD->getParent(); 714 if (RD->getNumVBases()) { 715 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 716 << isa<CXXConstructorDecl>(NewFD) 717 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 718 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 719 E = RD->vbases_end(); I != E; ++I) 720 Diag(I->getLocStart(), 721 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 722 return false; 723 } 724 } 725 726 if (!isa<CXXConstructorDecl>(NewFD)) { 727 // C++11 [dcl.constexpr]p3: 728 // The definition of a constexpr function shall satisfy the following 729 // constraints: 730 // - it shall not be virtual; 731 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 732 if (Method && Method->isVirtual()) { 733 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 734 735 // If it's not obvious why this function is virtual, find an overridden 736 // function which uses the 'virtual' keyword. 737 const CXXMethodDecl *WrittenVirtual = Method; 738 while (!WrittenVirtual->isVirtualAsWritten()) 739 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 740 if (WrittenVirtual != Method) 741 Diag(WrittenVirtual->getLocation(), 742 diag::note_overridden_virtual_function); 743 return false; 744 } 745 746 // - its return type shall be a literal type; 747 QualType RT = NewFD->getResultType(); 748 if (!RT->isDependentType() && 749 RequireLiteralType(NewFD->getLocation(), RT, 750 diag::err_constexpr_non_literal_return)) 751 return false; 752 } 753 754 // - each of its parameter types shall be a literal type; 755 if (!CheckConstexprParameterTypes(*this, NewFD)) 756 return false; 757 758 return true; 759} 760 761/// Check the given declaration statement is legal within a constexpr function 762/// body. C++0x [dcl.constexpr]p3,p4. 763/// 764/// \return true if the body is OK, false if we have diagnosed a problem. 765static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 766 DeclStmt *DS) { 767 // C++0x [dcl.constexpr]p3 and p4: 768 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 769 // contain only 770 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 771 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 772 switch ((*DclIt)->getKind()) { 773 case Decl::StaticAssert: 774 case Decl::Using: 775 case Decl::UsingShadow: 776 case Decl::UsingDirective: 777 case Decl::UnresolvedUsingTypename: 778 // - static_assert-declarations 779 // - using-declarations, 780 // - using-directives, 781 continue; 782 783 case Decl::Typedef: 784 case Decl::TypeAlias: { 785 // - typedef declarations and alias-declarations that do not define 786 // classes or enumerations, 787 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 788 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 789 // Don't allow variably-modified types in constexpr functions. 790 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 791 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 792 << TL.getSourceRange() << TL.getType() 793 << isa<CXXConstructorDecl>(Dcl); 794 return false; 795 } 796 continue; 797 } 798 799 case Decl::Enum: 800 case Decl::CXXRecord: 801 // As an extension, we allow the declaration (but not the definition) of 802 // classes and enumerations in all declarations, not just in typedef and 803 // alias declarations. 804 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 805 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 806 << isa<CXXConstructorDecl>(Dcl); 807 return false; 808 } 809 continue; 810 811 case Decl::Var: 812 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 813 << isa<CXXConstructorDecl>(Dcl); 814 return false; 815 816 default: 817 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 818 << isa<CXXConstructorDecl>(Dcl); 819 return false; 820 } 821 } 822 823 return true; 824} 825 826/// Check that the given field is initialized within a constexpr constructor. 827/// 828/// \param Dcl The constexpr constructor being checked. 829/// \param Field The field being checked. This may be a member of an anonymous 830/// struct or union nested within the class being checked. 831/// \param Inits All declarations, including anonymous struct/union members and 832/// indirect members, for which any initialization was provided. 833/// \param Diagnosed Set to true if an error is produced. 834static void CheckConstexprCtorInitializer(Sema &SemaRef, 835 const FunctionDecl *Dcl, 836 FieldDecl *Field, 837 llvm::SmallSet<Decl*, 16> &Inits, 838 bool &Diagnosed) { 839 if (Field->isUnnamedBitfield()) 840 return; 841 842 if (Field->isAnonymousStructOrUnion() && 843 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 844 return; 845 846 if (!Inits.count(Field)) { 847 if (!Diagnosed) { 848 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 849 Diagnosed = true; 850 } 851 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 852 } else if (Field->isAnonymousStructOrUnion()) { 853 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 854 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 855 I != E; ++I) 856 // If an anonymous union contains an anonymous struct of which any member 857 // is initialized, all members must be initialized. 858 if (!RD->isUnion() || Inits.count(*I)) 859 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 860 } 861} 862 863/// Check the body for the given constexpr function declaration only contains 864/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 865/// 866/// \return true if the body is OK, false if we have diagnosed a problem. 867bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 868 if (isa<CXXTryStmt>(Body)) { 869 // C++11 [dcl.constexpr]p3: 870 // The definition of a constexpr function shall satisfy the following 871 // constraints: [...] 872 // - its function-body shall be = delete, = default, or a 873 // compound-statement 874 // 875 // C++11 [dcl.constexpr]p4: 876 // In the definition of a constexpr constructor, [...] 877 // - its function-body shall not be a function-try-block; 878 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 879 << isa<CXXConstructorDecl>(Dcl); 880 return false; 881 } 882 883 // - its function-body shall be [...] a compound-statement that contains only 884 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 885 886 SmallVector<SourceLocation, 4> ReturnStmts; 887 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 888 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 889 switch ((*BodyIt)->getStmtClass()) { 890 case Stmt::NullStmtClass: 891 // - null statements, 892 continue; 893 894 case Stmt::DeclStmtClass: 895 // - static_assert-declarations 896 // - using-declarations, 897 // - using-directives, 898 // - typedef declarations and alias-declarations that do not define 899 // classes or enumerations, 900 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 901 return false; 902 continue; 903 904 case Stmt::ReturnStmtClass: 905 // - and exactly one return statement; 906 if (isa<CXXConstructorDecl>(Dcl)) 907 break; 908 909 ReturnStmts.push_back((*BodyIt)->getLocStart()); 910 continue; 911 912 default: 913 break; 914 } 915 916 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 917 << isa<CXXConstructorDecl>(Dcl); 918 return false; 919 } 920 921 if (const CXXConstructorDecl *Constructor 922 = dyn_cast<CXXConstructorDecl>(Dcl)) { 923 const CXXRecordDecl *RD = Constructor->getParent(); 924 // DR1359: 925 // - every non-variant non-static data member and base class sub-object 926 // shall be initialized; 927 // - if the class is a non-empty union, or for each non-empty anonymous 928 // union member of a non-union class, exactly one non-static data member 929 // shall be initialized; 930 if (RD->isUnion()) { 931 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 932 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 933 return false; 934 } 935 } else if (!Constructor->isDependentContext() && 936 !Constructor->isDelegatingConstructor()) { 937 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 938 939 // Skip detailed checking if we have enough initializers, and we would 940 // allow at most one initializer per member. 941 bool AnyAnonStructUnionMembers = false; 942 unsigned Fields = 0; 943 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 944 E = RD->field_end(); I != E; ++I, ++Fields) { 945 if (I->isAnonymousStructOrUnion()) { 946 AnyAnonStructUnionMembers = true; 947 break; 948 } 949 } 950 if (AnyAnonStructUnionMembers || 951 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 952 // Check initialization of non-static data members. Base classes are 953 // always initialized so do not need to be checked. Dependent bases 954 // might not have initializers in the member initializer list. 955 llvm::SmallSet<Decl*, 16> Inits; 956 for (CXXConstructorDecl::init_const_iterator 957 I = Constructor->init_begin(), E = Constructor->init_end(); 958 I != E; ++I) { 959 if (FieldDecl *FD = (*I)->getMember()) 960 Inits.insert(FD); 961 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 962 Inits.insert(ID->chain_begin(), ID->chain_end()); 963 } 964 965 bool Diagnosed = false; 966 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 967 E = RD->field_end(); I != E; ++I) 968 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 969 if (Diagnosed) 970 return false; 971 } 972 } 973 } else { 974 if (ReturnStmts.empty()) { 975 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 976 return false; 977 } 978 if (ReturnStmts.size() > 1) { 979 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 980 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 981 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 982 return false; 983 } 984 } 985 986 // C++11 [dcl.constexpr]p5: 987 // if no function argument values exist such that the function invocation 988 // substitution would produce a constant expression, the program is 989 // ill-formed; no diagnostic required. 990 // C++11 [dcl.constexpr]p3: 991 // - every constructor call and implicit conversion used in initializing the 992 // return value shall be one of those allowed in a constant expression. 993 // C++11 [dcl.constexpr]p4: 994 // - every constructor involved in initializing non-static data members and 995 // base class sub-objects shall be a constexpr constructor. 996 SmallVector<PartialDiagnosticAt, 8> Diags; 997 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 998 Diag(Dcl->getLocation(), diag::ext_constexpr_function_never_constant_expr) 999 << isa<CXXConstructorDecl>(Dcl); 1000 for (size_t I = 0, N = Diags.size(); I != N; ++I) 1001 Diag(Diags[I].first, Diags[I].second); 1002 // Don't return false here: we allow this for compatibility in 1003 // system headers. 1004 } 1005 1006 return true; 1007} 1008 1009/// isCurrentClassName - Determine whether the identifier II is the 1010/// name of the class type currently being defined. In the case of 1011/// nested classes, this will only return true if II is the name of 1012/// the innermost class. 1013bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 1014 const CXXScopeSpec *SS) { 1015 assert(getLangOpts().CPlusPlus && "No class names in C!"); 1016 1017 CXXRecordDecl *CurDecl; 1018 if (SS && SS->isSet() && !SS->isInvalid()) { 1019 DeclContext *DC = computeDeclContext(*SS, true); 1020 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 1021 } else 1022 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1023 1024 if (CurDecl && CurDecl->getIdentifier()) 1025 return &II == CurDecl->getIdentifier(); 1026 else 1027 return false; 1028} 1029 1030/// \brief Determine whether the given class is a base class of the given 1031/// class, including looking at dependent bases. 1032static bool findCircularInheritance(const CXXRecordDecl *Class, 1033 const CXXRecordDecl *Current) { 1034 SmallVector<const CXXRecordDecl*, 8> Queue; 1035 1036 Class = Class->getCanonicalDecl(); 1037 while (true) { 1038 for (CXXRecordDecl::base_class_const_iterator I = Current->bases_begin(), 1039 E = Current->bases_end(); 1040 I != E; ++I) { 1041 CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); 1042 if (!Base) 1043 continue; 1044 1045 Base = Base->getDefinition(); 1046 if (!Base) 1047 continue; 1048 1049 if (Base->getCanonicalDecl() == Class) 1050 return true; 1051 1052 Queue.push_back(Base); 1053 } 1054 1055 if (Queue.empty()) 1056 return false; 1057 1058 Current = Queue.back(); 1059 Queue.pop_back(); 1060 } 1061 1062 return false; 1063} 1064 1065/// \brief Check the validity of a C++ base class specifier. 1066/// 1067/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1068/// and returns NULL otherwise. 1069CXXBaseSpecifier * 1070Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1071 SourceRange SpecifierRange, 1072 bool Virtual, AccessSpecifier Access, 1073 TypeSourceInfo *TInfo, 1074 SourceLocation EllipsisLoc) { 1075 QualType BaseType = TInfo->getType(); 1076 1077 // C++ [class.union]p1: 1078 // A union shall not have base classes. 1079 if (Class->isUnion()) { 1080 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1081 << SpecifierRange; 1082 return 0; 1083 } 1084 1085 if (EllipsisLoc.isValid() && 1086 !TInfo->getType()->containsUnexpandedParameterPack()) { 1087 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1088 << TInfo->getTypeLoc().getSourceRange(); 1089 EllipsisLoc = SourceLocation(); 1090 } 1091 1092 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1093 1094 if (BaseType->isDependentType()) { 1095 // Make sure that we don't have circular inheritance among our dependent 1096 // bases. For non-dependent bases, the check for completeness below handles 1097 // this. 1098 if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) { 1099 if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() || 1100 ((BaseDecl = BaseDecl->getDefinition()) && 1101 findCircularInheritance(Class, BaseDecl))) { 1102 Diag(BaseLoc, diag::err_circular_inheritance) 1103 << BaseType << Context.getTypeDeclType(Class); 1104 1105 if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl()) 1106 Diag(BaseDecl->getLocation(), diag::note_previous_decl) 1107 << BaseType; 1108 1109 return 0; 1110 } 1111 } 1112 1113 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1114 Class->getTagKind() == TTK_Class, 1115 Access, TInfo, EllipsisLoc); 1116 } 1117 1118 // Base specifiers must be record types. 1119 if (!BaseType->isRecordType()) { 1120 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1121 return 0; 1122 } 1123 1124 // C++ [class.union]p1: 1125 // A union shall not be used as a base class. 1126 if (BaseType->isUnionType()) { 1127 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1128 return 0; 1129 } 1130 1131 // C++ [class.derived]p2: 1132 // The class-name in a base-specifier shall not be an incompletely 1133 // defined class. 1134 if (RequireCompleteType(BaseLoc, BaseType, 1135 diag::err_incomplete_base_class, SpecifierRange)) { 1136 Class->setInvalidDecl(); 1137 return 0; 1138 } 1139 1140 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1141 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1142 assert(BaseDecl && "Record type has no declaration"); 1143 BaseDecl = BaseDecl->getDefinition(); 1144 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1145 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1146 assert(CXXBaseDecl && "Base type is not a C++ type"); 1147 1148 // C++ [class]p3: 1149 // If a class is marked final and it appears as a base-type-specifier in 1150 // base-clause, the program is ill-formed. 1151 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1152 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1153 << CXXBaseDecl->getDeclName(); 1154 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1155 << CXXBaseDecl->getDeclName(); 1156 return 0; 1157 } 1158 1159 if (BaseDecl->isInvalidDecl()) 1160 Class->setInvalidDecl(); 1161 1162 // Create the base specifier. 1163 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1164 Class->getTagKind() == TTK_Class, 1165 Access, TInfo, EllipsisLoc); 1166} 1167 1168/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1169/// one entry in the base class list of a class specifier, for 1170/// example: 1171/// class foo : public bar, virtual private baz { 1172/// 'public bar' and 'virtual private baz' are each base-specifiers. 1173BaseResult 1174Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1175 bool Virtual, AccessSpecifier Access, 1176 ParsedType basetype, SourceLocation BaseLoc, 1177 SourceLocation EllipsisLoc) { 1178 if (!classdecl) 1179 return true; 1180 1181 AdjustDeclIfTemplate(classdecl); 1182 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1183 if (!Class) 1184 return true; 1185 1186 TypeSourceInfo *TInfo = 0; 1187 GetTypeFromParser(basetype, &TInfo); 1188 1189 if (EllipsisLoc.isInvalid() && 1190 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1191 UPPC_BaseType)) 1192 return true; 1193 1194 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1195 Virtual, Access, TInfo, 1196 EllipsisLoc)) 1197 return BaseSpec; 1198 else 1199 Class->setInvalidDecl(); 1200 1201 return true; 1202} 1203 1204/// \brief Performs the actual work of attaching the given base class 1205/// specifiers to a C++ class. 1206bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1207 unsigned NumBases) { 1208 if (NumBases == 0) 1209 return false; 1210 1211 // Used to keep track of which base types we have already seen, so 1212 // that we can properly diagnose redundant direct base types. Note 1213 // that the key is always the unqualified canonical type of the base 1214 // class. 1215 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1216 1217 // Copy non-redundant base specifiers into permanent storage. 1218 unsigned NumGoodBases = 0; 1219 bool Invalid = false; 1220 for (unsigned idx = 0; idx < NumBases; ++idx) { 1221 QualType NewBaseType 1222 = Context.getCanonicalType(Bases[idx]->getType()); 1223 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1224 1225 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1226 if (KnownBase) { 1227 // C++ [class.mi]p3: 1228 // A class shall not be specified as a direct base class of a 1229 // derived class more than once. 1230 Diag(Bases[idx]->getLocStart(), 1231 diag::err_duplicate_base_class) 1232 << KnownBase->getType() 1233 << Bases[idx]->getSourceRange(); 1234 1235 // Delete the duplicate base class specifier; we're going to 1236 // overwrite its pointer later. 1237 Context.Deallocate(Bases[idx]); 1238 1239 Invalid = true; 1240 } else { 1241 // Okay, add this new base class. 1242 KnownBase = Bases[idx]; 1243 Bases[NumGoodBases++] = Bases[idx]; 1244 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) { 1245 const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); 1246 if (Class->isInterface() && 1247 (!RD->isInterface() || 1248 KnownBase->getAccessSpecifier() != AS_public)) { 1249 // The Microsoft extension __interface does not permit bases that 1250 // are not themselves public interfaces. 1251 Diag(KnownBase->getLocStart(), diag::err_invalid_base_in_interface) 1252 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getName() 1253 << RD->getSourceRange(); 1254 Invalid = true; 1255 } 1256 if (RD->hasAttr<WeakAttr>()) 1257 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1258 } 1259 } 1260 } 1261 1262 // Attach the remaining base class specifiers to the derived class. 1263 Class->setBases(Bases, NumGoodBases); 1264 1265 // Delete the remaining (good) base class specifiers, since their 1266 // data has been copied into the CXXRecordDecl. 1267 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1268 Context.Deallocate(Bases[idx]); 1269 1270 return Invalid; 1271} 1272 1273/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1274/// class, after checking whether there are any duplicate base 1275/// classes. 1276void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1277 unsigned NumBases) { 1278 if (!ClassDecl || !Bases || !NumBases) 1279 return; 1280 1281 AdjustDeclIfTemplate(ClassDecl); 1282 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1283 (CXXBaseSpecifier**)(Bases), NumBases); 1284} 1285 1286static CXXRecordDecl *GetClassForType(QualType T) { 1287 if (const RecordType *RT = T->getAs<RecordType>()) 1288 return cast<CXXRecordDecl>(RT->getDecl()); 1289 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1290 return ICT->getDecl(); 1291 else 1292 return 0; 1293} 1294 1295/// \brief Determine whether the type \p Derived is a C++ class that is 1296/// derived from the type \p Base. 1297bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1298 if (!getLangOpts().CPlusPlus) 1299 return false; 1300 1301 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1302 if (!DerivedRD) 1303 return false; 1304 1305 CXXRecordDecl *BaseRD = GetClassForType(Base); 1306 if (!BaseRD) 1307 return false; 1308 1309 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1310 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1311} 1312 1313/// \brief Determine whether the type \p Derived is a C++ class that is 1314/// derived from the type \p Base. 1315bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1316 if (!getLangOpts().CPlusPlus) 1317 return false; 1318 1319 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1320 if (!DerivedRD) 1321 return false; 1322 1323 CXXRecordDecl *BaseRD = GetClassForType(Base); 1324 if (!BaseRD) 1325 return false; 1326 1327 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1328} 1329 1330void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1331 CXXCastPath &BasePathArray) { 1332 assert(BasePathArray.empty() && "Base path array must be empty!"); 1333 assert(Paths.isRecordingPaths() && "Must record paths!"); 1334 1335 const CXXBasePath &Path = Paths.front(); 1336 1337 // We first go backward and check if we have a virtual base. 1338 // FIXME: It would be better if CXXBasePath had the base specifier for 1339 // the nearest virtual base. 1340 unsigned Start = 0; 1341 for (unsigned I = Path.size(); I != 0; --I) { 1342 if (Path[I - 1].Base->isVirtual()) { 1343 Start = I - 1; 1344 break; 1345 } 1346 } 1347 1348 // Now add all bases. 1349 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1350 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1351} 1352 1353/// \brief Determine whether the given base path includes a virtual 1354/// base class. 1355bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1356 for (CXXCastPath::const_iterator B = BasePath.begin(), 1357 BEnd = BasePath.end(); 1358 B != BEnd; ++B) 1359 if ((*B)->isVirtual()) 1360 return true; 1361 1362 return false; 1363} 1364 1365/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1366/// conversion (where Derived and Base are class types) is 1367/// well-formed, meaning that the conversion is unambiguous (and 1368/// that all of the base classes are accessible). Returns true 1369/// and emits a diagnostic if the code is ill-formed, returns false 1370/// otherwise. Loc is the location where this routine should point to 1371/// if there is an error, and Range is the source range to highlight 1372/// if there is an error. 1373bool 1374Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1375 unsigned InaccessibleBaseID, 1376 unsigned AmbigiousBaseConvID, 1377 SourceLocation Loc, SourceRange Range, 1378 DeclarationName Name, 1379 CXXCastPath *BasePath) { 1380 // First, determine whether the path from Derived to Base is 1381 // ambiguous. This is slightly more expensive than checking whether 1382 // the Derived to Base conversion exists, because here we need to 1383 // explore multiple paths to determine if there is an ambiguity. 1384 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1385 /*DetectVirtual=*/false); 1386 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1387 assert(DerivationOkay && 1388 "Can only be used with a derived-to-base conversion"); 1389 (void)DerivationOkay; 1390 1391 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1392 if (InaccessibleBaseID) { 1393 // Check that the base class can be accessed. 1394 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1395 InaccessibleBaseID)) { 1396 case AR_inaccessible: 1397 return true; 1398 case AR_accessible: 1399 case AR_dependent: 1400 case AR_delayed: 1401 break; 1402 } 1403 } 1404 1405 // Build a base path if necessary. 1406 if (BasePath) 1407 BuildBasePathArray(Paths, *BasePath); 1408 return false; 1409 } 1410 1411 // We know that the derived-to-base conversion is ambiguous, and 1412 // we're going to produce a diagnostic. Perform the derived-to-base 1413 // search just one more time to compute all of the possible paths so 1414 // that we can print them out. This is more expensive than any of 1415 // the previous derived-to-base checks we've done, but at this point 1416 // performance isn't as much of an issue. 1417 Paths.clear(); 1418 Paths.setRecordingPaths(true); 1419 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1420 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1421 (void)StillOkay; 1422 1423 // Build up a textual representation of the ambiguous paths, e.g., 1424 // D -> B -> A, that will be used to illustrate the ambiguous 1425 // conversions in the diagnostic. We only print one of the paths 1426 // to each base class subobject. 1427 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1428 1429 Diag(Loc, AmbigiousBaseConvID) 1430 << Derived << Base << PathDisplayStr << Range << Name; 1431 return true; 1432} 1433 1434bool 1435Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1436 SourceLocation Loc, SourceRange Range, 1437 CXXCastPath *BasePath, 1438 bool IgnoreAccess) { 1439 return CheckDerivedToBaseConversion(Derived, Base, 1440 IgnoreAccess ? 0 1441 : diag::err_upcast_to_inaccessible_base, 1442 diag::err_ambiguous_derived_to_base_conv, 1443 Loc, Range, DeclarationName(), 1444 BasePath); 1445} 1446 1447 1448/// @brief Builds a string representing ambiguous paths from a 1449/// specific derived class to different subobjects of the same base 1450/// class. 1451/// 1452/// This function builds a string that can be used in error messages 1453/// to show the different paths that one can take through the 1454/// inheritance hierarchy to go from the derived class to different 1455/// subobjects of a base class. The result looks something like this: 1456/// @code 1457/// struct D -> struct B -> struct A 1458/// struct D -> struct C -> struct A 1459/// @endcode 1460std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1461 std::string PathDisplayStr; 1462 std::set<unsigned> DisplayedPaths; 1463 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1464 Path != Paths.end(); ++Path) { 1465 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1466 // We haven't displayed a path to this particular base 1467 // class subobject yet. 1468 PathDisplayStr += "\n "; 1469 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1470 for (CXXBasePath::const_iterator Element = Path->begin(); 1471 Element != Path->end(); ++Element) 1472 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1473 } 1474 } 1475 1476 return PathDisplayStr; 1477} 1478 1479//===----------------------------------------------------------------------===// 1480// C++ class member Handling 1481//===----------------------------------------------------------------------===// 1482 1483/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1484bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1485 SourceLocation ASLoc, 1486 SourceLocation ColonLoc, 1487 AttributeList *Attrs) { 1488 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1489 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1490 ASLoc, ColonLoc); 1491 CurContext->addHiddenDecl(ASDecl); 1492 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1493} 1494 1495/// CheckOverrideControl - Check C++11 override control semantics. 1496void Sema::CheckOverrideControl(Decl *D) { 1497 if (D->isInvalidDecl()) 1498 return; 1499 1500 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1501 1502 // Do we know which functions this declaration might be overriding? 1503 bool OverridesAreKnown = !MD || 1504 (!MD->getParent()->hasAnyDependentBases() && 1505 !MD->getType()->isDependentType()); 1506 1507 if (!MD || !MD->isVirtual()) { 1508 if (OverridesAreKnown) { 1509 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1510 Diag(OA->getLocation(), 1511 diag::override_keyword_only_allowed_on_virtual_member_functions) 1512 << "override" << FixItHint::CreateRemoval(OA->getLocation()); 1513 D->dropAttr<OverrideAttr>(); 1514 } 1515 if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1516 Diag(FA->getLocation(), 1517 diag::override_keyword_only_allowed_on_virtual_member_functions) 1518 << "final" << FixItHint::CreateRemoval(FA->getLocation()); 1519 D->dropAttr<FinalAttr>(); 1520 } 1521 } 1522 return; 1523 } 1524 1525 if (!OverridesAreKnown) 1526 return; 1527 1528 // C++11 [class.virtual]p5: 1529 // If a virtual function is marked with the virt-specifier override and 1530 // does not override a member function of a base class, the program is 1531 // ill-formed. 1532 bool HasOverriddenMethods = 1533 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1534 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) 1535 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) 1536 << MD->getDeclName(); 1537} 1538 1539/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1540/// function overrides a virtual member function marked 'final', according to 1541/// C++11 [class.virtual]p4. 1542bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1543 const CXXMethodDecl *Old) { 1544 if (!Old->hasAttr<FinalAttr>()) 1545 return false; 1546 1547 Diag(New->getLocation(), diag::err_final_function_overridden) 1548 << New->getDeclName(); 1549 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1550 return true; 1551} 1552 1553static bool InitializationHasSideEffects(const FieldDecl &FD) { 1554 const Type *T = FD.getType()->getBaseElementTypeUnsafe(); 1555 // FIXME: Destruction of ObjC lifetime types has side-effects. 1556 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) 1557 return !RD->isCompleteDefinition() || 1558 !RD->hasTrivialDefaultConstructor() || 1559 !RD->hasTrivialDestructor(); 1560 return false; 1561} 1562 1563/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1564/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1565/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1566/// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1567/// present (but parsing it has been deferred). 1568NamedDecl * 1569Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1570 MultiTemplateParamsArg TemplateParameterLists, 1571 Expr *BW, const VirtSpecifiers &VS, 1572 InClassInitStyle InitStyle) { 1573 const DeclSpec &DS = D.getDeclSpec(); 1574 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1575 DeclarationName Name = NameInfo.getName(); 1576 SourceLocation Loc = NameInfo.getLoc(); 1577 1578 // For anonymous bitfields, the location should point to the type. 1579 if (Loc.isInvalid()) 1580 Loc = D.getLocStart(); 1581 1582 Expr *BitWidth = static_cast<Expr*>(BW); 1583 1584 assert(isa<CXXRecordDecl>(CurContext)); 1585 assert(!DS.isFriendSpecified()); 1586 1587 bool isFunc = D.isDeclarationOfFunction(); 1588 1589 if (cast<CXXRecordDecl>(CurContext)->isInterface()) { 1590 // The Microsoft extension __interface only permits public member functions 1591 // and prohibits constructors, destructors, operators, non-public member 1592 // functions, static methods and data members. 1593 unsigned InvalidDecl; 1594 bool ShowDeclName = true; 1595 if (!isFunc) 1596 InvalidDecl = (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) ? 0 : 1; 1597 else if (AS != AS_public) 1598 InvalidDecl = 2; 1599 else if (DS.getStorageClassSpec() == DeclSpec::SCS_static) 1600 InvalidDecl = 3; 1601 else switch (Name.getNameKind()) { 1602 case DeclarationName::CXXConstructorName: 1603 InvalidDecl = 4; 1604 ShowDeclName = false; 1605 break; 1606 1607 case DeclarationName::CXXDestructorName: 1608 InvalidDecl = 5; 1609 ShowDeclName = false; 1610 break; 1611 1612 case DeclarationName::CXXOperatorName: 1613 case DeclarationName::CXXConversionFunctionName: 1614 InvalidDecl = 6; 1615 break; 1616 1617 default: 1618 InvalidDecl = 0; 1619 break; 1620 } 1621 1622 if (InvalidDecl) { 1623 if (ShowDeclName) 1624 Diag(Loc, diag::err_invalid_member_in_interface) 1625 << (InvalidDecl-1) << Name; 1626 else 1627 Diag(Loc, diag::err_invalid_member_in_interface) 1628 << (InvalidDecl-1) << ""; 1629 return 0; 1630 } 1631 } 1632 1633 // C++ 9.2p6: A member shall not be declared to have automatic storage 1634 // duration (auto, register) or with the extern storage-class-specifier. 1635 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1636 // data members and cannot be applied to names declared const or static, 1637 // and cannot be applied to reference members. 1638 switch (DS.getStorageClassSpec()) { 1639 case DeclSpec::SCS_unspecified: 1640 case DeclSpec::SCS_typedef: 1641 case DeclSpec::SCS_static: 1642 // FALL THROUGH. 1643 break; 1644 case DeclSpec::SCS_mutable: 1645 if (isFunc) { 1646 if (DS.getStorageClassSpecLoc().isValid()) 1647 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1648 else 1649 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1650 1651 // FIXME: It would be nicer if the keyword was ignored only for this 1652 // declarator. Otherwise we could get follow-up errors. 1653 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1654 } 1655 break; 1656 default: 1657 if (DS.getStorageClassSpecLoc().isValid()) 1658 Diag(DS.getStorageClassSpecLoc(), 1659 diag::err_storageclass_invalid_for_member); 1660 else 1661 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1662 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1663 } 1664 1665 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1666 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1667 !isFunc); 1668 1669 NamedDecl *Member; 1670 if (isInstField) { 1671 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1672 1673 // Data members must have identifiers for names. 1674 if (!Name.isIdentifier()) { 1675 Diag(Loc, diag::err_bad_variable_name) 1676 << Name; 1677 return 0; 1678 } 1679 1680 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1681 1682 // Member field could not be with "template" keyword. 1683 // So TemplateParameterLists should be empty in this case. 1684 if (TemplateParameterLists.size()) { 1685 TemplateParameterList* TemplateParams = TemplateParameterLists[0]; 1686 if (TemplateParams->size()) { 1687 // There is no such thing as a member field template. 1688 Diag(D.getIdentifierLoc(), diag::err_template_member) 1689 << II 1690 << SourceRange(TemplateParams->getTemplateLoc(), 1691 TemplateParams->getRAngleLoc()); 1692 } else { 1693 // There is an extraneous 'template<>' for this member. 1694 Diag(TemplateParams->getTemplateLoc(), 1695 diag::err_template_member_noparams) 1696 << II 1697 << SourceRange(TemplateParams->getTemplateLoc(), 1698 TemplateParams->getRAngleLoc()); 1699 } 1700 return 0; 1701 } 1702 1703 if (SS.isSet() && !SS.isInvalid()) { 1704 // The user provided a superfluous scope specifier inside a class 1705 // definition: 1706 // 1707 // class X { 1708 // int X::member; 1709 // }; 1710 if (DeclContext *DC = computeDeclContext(SS, false)) 1711 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1712 else 1713 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1714 << Name << SS.getRange(); 1715 1716 SS.clear(); 1717 } 1718 1719 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1720 InitStyle, AS); 1721 assert(Member && "HandleField never returns null"); 1722 } else { 1723 assert(InitStyle == ICIS_NoInit); 1724 1725 Member = HandleDeclarator(S, D, TemplateParameterLists); 1726 if (!Member) { 1727 return 0; 1728 } 1729 1730 // Non-instance-fields can't have a bitfield. 1731 if (BitWidth) { 1732 if (Member->isInvalidDecl()) { 1733 // don't emit another diagnostic. 1734 } else if (isa<VarDecl>(Member)) { 1735 // C++ 9.6p3: A bit-field shall not be a static member. 1736 // "static member 'A' cannot be a bit-field" 1737 Diag(Loc, diag::err_static_not_bitfield) 1738 << Name << BitWidth->getSourceRange(); 1739 } else if (isa<TypedefDecl>(Member)) { 1740 // "typedef member 'x' cannot be a bit-field" 1741 Diag(Loc, diag::err_typedef_not_bitfield) 1742 << Name << BitWidth->getSourceRange(); 1743 } else { 1744 // A function typedef ("typedef int f(); f a;"). 1745 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1746 Diag(Loc, diag::err_not_integral_type_bitfield) 1747 << Name << cast<ValueDecl>(Member)->getType() 1748 << BitWidth->getSourceRange(); 1749 } 1750 1751 BitWidth = 0; 1752 Member->setInvalidDecl(); 1753 } 1754 1755 Member->setAccess(AS); 1756 1757 // If we have declared a member function template, set the access of the 1758 // templated declaration as well. 1759 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1760 FunTmpl->getTemplatedDecl()->setAccess(AS); 1761 } 1762 1763 if (VS.isOverrideSpecified()) 1764 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1765 if (VS.isFinalSpecified()) 1766 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1767 1768 if (VS.getLastLocation().isValid()) { 1769 // Update the end location of a method that has a virt-specifiers. 1770 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1771 MD->setRangeEnd(VS.getLastLocation()); 1772 } 1773 1774 CheckOverrideControl(Member); 1775 1776 assert((Name || isInstField) && "No identifier for non-field ?"); 1777 1778 if (isInstField) { 1779 FieldDecl *FD = cast<FieldDecl>(Member); 1780 FieldCollector->Add(FD); 1781 1782 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 1783 FD->getLocation()) 1784 != DiagnosticsEngine::Ignored) { 1785 // Remember all explicit private FieldDecls that have a name, no side 1786 // effects and are not part of a dependent type declaration. 1787 if (!FD->isImplicit() && FD->getDeclName() && 1788 FD->getAccess() == AS_private && 1789 !FD->hasAttr<UnusedAttr>() && 1790 !FD->getParent()->isDependentContext() && 1791 !InitializationHasSideEffects(*FD)) 1792 UnusedPrivateFields.insert(FD); 1793 } 1794 } 1795 1796 return Member; 1797} 1798 1799namespace { 1800 class UninitializedFieldVisitor 1801 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 1802 Sema &S; 1803 ValueDecl *VD; 1804 public: 1805 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 1806 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context), 1807 S(S) { 1808 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(VD)) 1809 this->VD = IFD->getAnonField(); 1810 else 1811 this->VD = VD; 1812 } 1813 1814 void HandleExpr(Expr *E) { 1815 if (!E) return; 1816 1817 // Expressions like x(x) sometimes lack the surrounding expressions 1818 // but need to be checked anyways. 1819 HandleValue(E); 1820 Visit(E); 1821 } 1822 1823 void HandleValue(Expr *E) { 1824 E = E->IgnoreParens(); 1825 1826 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 1827 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 1828 return; 1829 1830 // FieldME is the inner-most MemberExpr that is not an anonymous struct 1831 // or union. 1832 MemberExpr *FieldME = ME; 1833 1834 Expr *Base = E; 1835 while (isa<MemberExpr>(Base)) { 1836 ME = cast<MemberExpr>(Base); 1837 1838 if (isa<VarDecl>(ME->getMemberDecl())) 1839 return; 1840 1841 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 1842 if (!FD->isAnonymousStructOrUnion()) 1843 FieldME = ME; 1844 1845 Base = ME->getBase(); 1846 } 1847 1848 if (VD == FieldME->getMemberDecl() && isa<CXXThisExpr>(Base)) { 1849 unsigned diag = VD->getType()->isReferenceType() 1850 ? diag::warn_reference_field_is_uninit 1851 : diag::warn_field_is_uninit; 1852 S.Diag(FieldME->getExprLoc(), diag) << VD; 1853 } 1854 return; 1855 } 1856 1857 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 1858 HandleValue(CO->getTrueExpr()); 1859 HandleValue(CO->getFalseExpr()); 1860 return; 1861 } 1862 1863 if (BinaryConditionalOperator *BCO = 1864 dyn_cast<BinaryConditionalOperator>(E)) { 1865 HandleValue(BCO->getCommon()); 1866 HandleValue(BCO->getFalseExpr()); 1867 return; 1868 } 1869 1870 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 1871 switch (BO->getOpcode()) { 1872 default: 1873 return; 1874 case(BO_PtrMemD): 1875 case(BO_PtrMemI): 1876 HandleValue(BO->getLHS()); 1877 return; 1878 case(BO_Comma): 1879 HandleValue(BO->getRHS()); 1880 return; 1881 } 1882 } 1883 } 1884 1885 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 1886 if (E->getCastKind() == CK_LValueToRValue) 1887 HandleValue(E->getSubExpr()); 1888 1889 Inherited::VisitImplicitCastExpr(E); 1890 } 1891 1892 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 1893 Expr *Callee = E->getCallee(); 1894 if (isa<MemberExpr>(Callee)) 1895 HandleValue(Callee); 1896 1897 Inherited::VisitCXXMemberCallExpr(E); 1898 } 1899 }; 1900 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E, 1901 ValueDecl *VD) { 1902 UninitializedFieldVisitor(S, VD).HandleExpr(E); 1903 } 1904} // namespace 1905 1906/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1907/// in-class initializer for a non-static C++ class member, and after 1908/// instantiating an in-class initializer in a class template. Such actions 1909/// are deferred until the class is complete. 1910void 1911Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 1912 Expr *InitExpr) { 1913 FieldDecl *FD = cast<FieldDecl>(D); 1914 assert(FD->getInClassInitStyle() != ICIS_NoInit && 1915 "must set init style when field is created"); 1916 1917 if (!InitExpr) { 1918 FD->setInvalidDecl(); 1919 FD->removeInClassInitializer(); 1920 return; 1921 } 1922 1923 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1924 FD->setInvalidDecl(); 1925 FD->removeInClassInitializer(); 1926 return; 1927 } 1928 1929 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, InitLoc) 1930 != DiagnosticsEngine::Ignored) { 1931 CheckInitExprContainsUninitializedFields(*this, InitExpr, FD); 1932 } 1933 1934 ExprResult Init = InitExpr; 1935 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1936 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1937 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1938 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1939 } 1940 Expr **Inits = &InitExpr; 1941 unsigned NumInits = 1; 1942 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1943 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 1944 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1945 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 1946 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 1947 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 1948 if (Init.isInvalid()) { 1949 FD->setInvalidDecl(); 1950 return; 1951 } 1952 } 1953 1954 // C++11 [class.base.init]p7: 1955 // The initialization of each base and member constitutes a 1956 // full-expression. 1957 Init = ActOnFinishFullExpr(Init.take(), InitLoc); 1958 if (Init.isInvalid()) { 1959 FD->setInvalidDecl(); 1960 return; 1961 } 1962 1963 InitExpr = Init.release(); 1964 1965 FD->setInClassInitializer(InitExpr); 1966} 1967 1968/// \brief Find the direct and/or virtual base specifiers that 1969/// correspond to the given base type, for use in base initialization 1970/// within a constructor. 1971static bool FindBaseInitializer(Sema &SemaRef, 1972 CXXRecordDecl *ClassDecl, 1973 QualType BaseType, 1974 const CXXBaseSpecifier *&DirectBaseSpec, 1975 const CXXBaseSpecifier *&VirtualBaseSpec) { 1976 // First, check for a direct base class. 1977 DirectBaseSpec = 0; 1978 for (CXXRecordDecl::base_class_const_iterator Base 1979 = ClassDecl->bases_begin(); 1980 Base != ClassDecl->bases_end(); ++Base) { 1981 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1982 // We found a direct base of this type. That's what we're 1983 // initializing. 1984 DirectBaseSpec = &*Base; 1985 break; 1986 } 1987 } 1988 1989 // Check for a virtual base class. 1990 // FIXME: We might be able to short-circuit this if we know in advance that 1991 // there are no virtual bases. 1992 VirtualBaseSpec = 0; 1993 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1994 // We haven't found a base yet; search the class hierarchy for a 1995 // virtual base class. 1996 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1997 /*DetectVirtual=*/false); 1998 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1999 BaseType, Paths)) { 2000 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 2001 Path != Paths.end(); ++Path) { 2002 if (Path->back().Base->isVirtual()) { 2003 VirtualBaseSpec = Path->back().Base; 2004 break; 2005 } 2006 } 2007 } 2008 } 2009 2010 return DirectBaseSpec || VirtualBaseSpec; 2011} 2012 2013/// \brief Handle a C++ member initializer using braced-init-list syntax. 2014MemInitResult 2015Sema::ActOnMemInitializer(Decl *ConstructorD, 2016 Scope *S, 2017 CXXScopeSpec &SS, 2018 IdentifierInfo *MemberOrBase, 2019 ParsedType TemplateTypeTy, 2020 const DeclSpec &DS, 2021 SourceLocation IdLoc, 2022 Expr *InitList, 2023 SourceLocation EllipsisLoc) { 2024 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2025 DS, IdLoc, InitList, 2026 EllipsisLoc); 2027} 2028 2029/// \brief Handle a C++ member initializer using parentheses syntax. 2030MemInitResult 2031Sema::ActOnMemInitializer(Decl *ConstructorD, 2032 Scope *S, 2033 CXXScopeSpec &SS, 2034 IdentifierInfo *MemberOrBase, 2035 ParsedType TemplateTypeTy, 2036 const DeclSpec &DS, 2037 SourceLocation IdLoc, 2038 SourceLocation LParenLoc, 2039 Expr **Args, unsigned NumArgs, 2040 SourceLocation RParenLoc, 2041 SourceLocation EllipsisLoc) { 2042 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, 2043 llvm::makeArrayRef(Args, NumArgs), 2044 RParenLoc); 2045 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2046 DS, IdLoc, List, EllipsisLoc); 2047} 2048 2049namespace { 2050 2051// Callback to only accept typo corrections that can be a valid C++ member 2052// intializer: either a non-static field member or a base class. 2053class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 2054 public: 2055 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 2056 : ClassDecl(ClassDecl) {} 2057 2058 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 2059 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 2060 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 2061 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 2062 else 2063 return isa<TypeDecl>(ND); 2064 } 2065 return false; 2066 } 2067 2068 private: 2069 CXXRecordDecl *ClassDecl; 2070}; 2071 2072} 2073 2074/// \brief Handle a C++ member initializer. 2075MemInitResult 2076Sema::BuildMemInitializer(Decl *ConstructorD, 2077 Scope *S, 2078 CXXScopeSpec &SS, 2079 IdentifierInfo *MemberOrBase, 2080 ParsedType TemplateTypeTy, 2081 const DeclSpec &DS, 2082 SourceLocation IdLoc, 2083 Expr *Init, 2084 SourceLocation EllipsisLoc) { 2085 if (!ConstructorD) 2086 return true; 2087 2088 AdjustDeclIfTemplate(ConstructorD); 2089 2090 CXXConstructorDecl *Constructor 2091 = dyn_cast<CXXConstructorDecl>(ConstructorD); 2092 if (!Constructor) { 2093 // The user wrote a constructor initializer on a function that is 2094 // not a C++ constructor. Ignore the error for now, because we may 2095 // have more member initializers coming; we'll diagnose it just 2096 // once in ActOnMemInitializers. 2097 return true; 2098 } 2099 2100 CXXRecordDecl *ClassDecl = Constructor->getParent(); 2101 2102 // C++ [class.base.init]p2: 2103 // Names in a mem-initializer-id are looked up in the scope of the 2104 // constructor's class and, if not found in that scope, are looked 2105 // up in the scope containing the constructor's definition. 2106 // [Note: if the constructor's class contains a member with the 2107 // same name as a direct or virtual base class of the class, a 2108 // mem-initializer-id naming the member or base class and composed 2109 // of a single identifier refers to the class member. A 2110 // mem-initializer-id for the hidden base class may be specified 2111 // using a qualified name. ] 2112 if (!SS.getScopeRep() && !TemplateTypeTy) { 2113 // Look for a member, first. 2114 DeclContext::lookup_result Result 2115 = ClassDecl->lookup(MemberOrBase); 2116 if (!Result.empty()) { 2117 ValueDecl *Member; 2118 if ((Member = dyn_cast<FieldDecl>(Result.front())) || 2119 (Member = dyn_cast<IndirectFieldDecl>(Result.front()))) { 2120 if (EllipsisLoc.isValid()) 2121 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 2122 << MemberOrBase 2123 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 2124 2125 return BuildMemberInitializer(Member, Init, IdLoc); 2126 } 2127 } 2128 } 2129 // It didn't name a member, so see if it names a class. 2130 QualType BaseType; 2131 TypeSourceInfo *TInfo = 0; 2132 2133 if (TemplateTypeTy) { 2134 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 2135 } else if (DS.getTypeSpecType() == TST_decltype) { 2136 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 2137 } else { 2138 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 2139 LookupParsedName(R, S, &SS); 2140 2141 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 2142 if (!TyD) { 2143 if (R.isAmbiguous()) return true; 2144 2145 // We don't want access-control diagnostics here. 2146 R.suppressDiagnostics(); 2147 2148 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 2149 bool NotUnknownSpecialization = false; 2150 DeclContext *DC = computeDeclContext(SS, false); 2151 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 2152 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 2153 2154 if (!NotUnknownSpecialization) { 2155 // When the scope specifier can refer to a member of an unknown 2156 // specialization, we take it as a type name. 2157 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 2158 SS.getWithLocInContext(Context), 2159 *MemberOrBase, IdLoc); 2160 if (BaseType.isNull()) 2161 return true; 2162 2163 R.clear(); 2164 R.setLookupName(MemberOrBase); 2165 } 2166 } 2167 2168 // If no results were found, try to correct typos. 2169 TypoCorrection Corr; 2170 MemInitializerValidatorCCC Validator(ClassDecl); 2171 if (R.empty() && BaseType.isNull() && 2172 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 2173 Validator, ClassDecl))) { 2174 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 2175 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 2176 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 2177 // We have found a non-static data member with a similar 2178 // name to what was typed; complain and initialize that 2179 // member. 2180 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2181 << MemberOrBase << true << CorrectedQuotedStr 2182 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2183 Diag(Member->getLocation(), diag::note_previous_decl) 2184 << CorrectedQuotedStr; 2185 2186 return BuildMemberInitializer(Member, Init, IdLoc); 2187 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 2188 const CXXBaseSpecifier *DirectBaseSpec; 2189 const CXXBaseSpecifier *VirtualBaseSpec; 2190 if (FindBaseInitializer(*this, ClassDecl, 2191 Context.getTypeDeclType(Type), 2192 DirectBaseSpec, VirtualBaseSpec)) { 2193 // We have found a direct or virtual base class with a 2194 // similar name to what was typed; complain and initialize 2195 // that base class. 2196 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2197 << MemberOrBase << false << CorrectedQuotedStr 2198 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2199 2200 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 2201 : VirtualBaseSpec; 2202 Diag(BaseSpec->getLocStart(), 2203 diag::note_base_class_specified_here) 2204 << BaseSpec->getType() 2205 << BaseSpec->getSourceRange(); 2206 2207 TyD = Type; 2208 } 2209 } 2210 } 2211 2212 if (!TyD && BaseType.isNull()) { 2213 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 2214 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 2215 return true; 2216 } 2217 } 2218 2219 if (BaseType.isNull()) { 2220 BaseType = Context.getTypeDeclType(TyD); 2221 if (SS.isSet()) { 2222 NestedNameSpecifier *Qualifier = 2223 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2224 2225 // FIXME: preserve source range information 2226 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 2227 } 2228 } 2229 } 2230 2231 if (!TInfo) 2232 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 2233 2234 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 2235} 2236 2237/// Checks a member initializer expression for cases where reference (or 2238/// pointer) members are bound to by-value parameters (or their addresses). 2239static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 2240 Expr *Init, 2241 SourceLocation IdLoc) { 2242 QualType MemberTy = Member->getType(); 2243 2244 // We only handle pointers and references currently. 2245 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 2246 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 2247 return; 2248 2249 const bool IsPointer = MemberTy->isPointerType(); 2250 if (IsPointer) { 2251 if (const UnaryOperator *Op 2252 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2253 // The only case we're worried about with pointers requires taking the 2254 // address. 2255 if (Op->getOpcode() != UO_AddrOf) 2256 return; 2257 2258 Init = Op->getSubExpr(); 2259 } else { 2260 // We only handle address-of expression initializers for pointers. 2261 return; 2262 } 2263 } 2264 2265 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 2266 // Taking the address of a temporary will be diagnosed as a hard error. 2267 if (IsPointer) 2268 return; 2269 2270 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 2271 << Member << Init->getSourceRange(); 2272 } else if (const DeclRefExpr *DRE 2273 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2274 // We only warn when referring to a non-reference parameter declaration. 2275 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2276 if (!Parameter || Parameter->getType()->isReferenceType()) 2277 return; 2278 2279 S.Diag(Init->getExprLoc(), 2280 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2281 : diag::warn_bind_ref_member_to_parameter) 2282 << Member << Parameter << Init->getSourceRange(); 2283 } else { 2284 // Other initializers are fine. 2285 return; 2286 } 2287 2288 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2289 << (unsigned)IsPointer; 2290} 2291 2292MemInitResult 2293Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2294 SourceLocation IdLoc) { 2295 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2296 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2297 assert((DirectMember || IndirectMember) && 2298 "Member must be a FieldDecl or IndirectFieldDecl"); 2299 2300 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2301 return true; 2302 2303 if (Member->isInvalidDecl()) 2304 return true; 2305 2306 // Diagnose value-uses of fields to initialize themselves, e.g. 2307 // foo(foo) 2308 // where foo is not also a parameter to the constructor. 2309 // TODO: implement -Wuninitialized and fold this into that framework. 2310 Expr **Args; 2311 unsigned NumArgs; 2312 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2313 Args = ParenList->getExprs(); 2314 NumArgs = ParenList->getNumExprs(); 2315 } else if (InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) { 2316 Args = InitList->getInits(); 2317 NumArgs = InitList->getNumInits(); 2318 } else { 2319 // Template instantiation doesn't reconstruct ParenListExprs for us. 2320 Args = &Init; 2321 NumArgs = 1; 2322 } 2323 2324 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc) 2325 != DiagnosticsEngine::Ignored) 2326 for (unsigned i = 0; i < NumArgs; ++i) 2327 // FIXME: Warn about the case when other fields are used before being 2328 // initialized. For example, let this field be the i'th field. When 2329 // initializing the i'th field, throw a warning if any of the >= i'th 2330 // fields are used, as they are not yet initialized. 2331 // Right now we are only handling the case where the i'th field uses 2332 // itself in its initializer. 2333 // Also need to take into account that some fields may be initialized by 2334 // in-class initializers, see C++11 [class.base.init]p9. 2335 CheckInitExprContainsUninitializedFields(*this, Args[i], Member); 2336 2337 SourceRange InitRange = Init->getSourceRange(); 2338 2339 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2340 // Can't check initialization for a member of dependent type or when 2341 // any of the arguments are type-dependent expressions. 2342 DiscardCleanupsInEvaluationContext(); 2343 } else { 2344 bool InitList = false; 2345 if (isa<InitListExpr>(Init)) { 2346 InitList = true; 2347 Args = &Init; 2348 NumArgs = 1; 2349 2350 if (isStdInitializerList(Member->getType(), 0)) { 2351 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2352 << /*at end of ctor*/1 << InitRange; 2353 } 2354 } 2355 2356 // Initialize the member. 2357 InitializedEntity MemberEntity = 2358 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2359 : InitializedEntity::InitializeMember(IndirectMember, 0); 2360 InitializationKind Kind = 2361 InitList ? InitializationKind::CreateDirectList(IdLoc) 2362 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2363 InitRange.getEnd()); 2364 2365 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2366 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2367 MultiExprArg(Args, NumArgs), 2368 0); 2369 if (MemberInit.isInvalid()) 2370 return true; 2371 2372 // C++11 [class.base.init]p7: 2373 // The initialization of each base and member constitutes a 2374 // full-expression. 2375 MemberInit = ActOnFinishFullExpr(MemberInit.get(), InitRange.getBegin()); 2376 if (MemberInit.isInvalid()) 2377 return true; 2378 2379 Init = MemberInit.get(); 2380 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2381 } 2382 2383 if (DirectMember) { 2384 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2385 InitRange.getBegin(), Init, 2386 InitRange.getEnd()); 2387 } else { 2388 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2389 InitRange.getBegin(), Init, 2390 InitRange.getEnd()); 2391 } 2392} 2393 2394MemInitResult 2395Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2396 CXXRecordDecl *ClassDecl) { 2397 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2398 if (!LangOpts.CPlusPlus11) 2399 return Diag(NameLoc, diag::err_delegating_ctor) 2400 << TInfo->getTypeLoc().getLocalSourceRange(); 2401 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2402 2403 bool InitList = true; 2404 Expr **Args = &Init; 2405 unsigned NumArgs = 1; 2406 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2407 InitList = false; 2408 Args = ParenList->getExprs(); 2409 NumArgs = ParenList->getNumExprs(); 2410 } 2411 2412 SourceRange InitRange = Init->getSourceRange(); 2413 // Initialize the object. 2414 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2415 QualType(ClassDecl->getTypeForDecl(), 0)); 2416 InitializationKind Kind = 2417 InitList ? InitializationKind::CreateDirectList(NameLoc) 2418 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2419 InitRange.getEnd()); 2420 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2421 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2422 MultiExprArg(Args, NumArgs), 2423 0); 2424 if (DelegationInit.isInvalid()) 2425 return true; 2426 2427 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2428 "Delegating constructor with no target?"); 2429 2430 // C++11 [class.base.init]p7: 2431 // The initialization of each base and member constitutes a 2432 // full-expression. 2433 DelegationInit = ActOnFinishFullExpr(DelegationInit.get(), 2434 InitRange.getBegin()); 2435 if (DelegationInit.isInvalid()) 2436 return true; 2437 2438 // If we are in a dependent context, template instantiation will 2439 // perform this type-checking again. Just save the arguments that we 2440 // received in a ParenListExpr. 2441 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2442 // of the information that we have about the base 2443 // initializer. However, deconstructing the ASTs is a dicey process, 2444 // and this approach is far more likely to get the corner cases right. 2445 if (CurContext->isDependentContext()) 2446 DelegationInit = Owned(Init); 2447 2448 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2449 DelegationInit.takeAs<Expr>(), 2450 InitRange.getEnd()); 2451} 2452 2453MemInitResult 2454Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2455 Expr *Init, CXXRecordDecl *ClassDecl, 2456 SourceLocation EllipsisLoc) { 2457 SourceLocation BaseLoc 2458 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2459 2460 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2461 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2462 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2463 2464 // C++ [class.base.init]p2: 2465 // [...] Unless the mem-initializer-id names a nonstatic data 2466 // member of the constructor's class or a direct or virtual base 2467 // of that class, the mem-initializer is ill-formed. A 2468 // mem-initializer-list can initialize a base class using any 2469 // name that denotes that base class type. 2470 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2471 2472 SourceRange InitRange = Init->getSourceRange(); 2473 if (EllipsisLoc.isValid()) { 2474 // This is a pack expansion. 2475 if (!BaseType->containsUnexpandedParameterPack()) { 2476 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2477 << SourceRange(BaseLoc, InitRange.getEnd()); 2478 2479 EllipsisLoc = SourceLocation(); 2480 } 2481 } else { 2482 // Check for any unexpanded parameter packs. 2483 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2484 return true; 2485 2486 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2487 return true; 2488 } 2489 2490 // Check for direct and virtual base classes. 2491 const CXXBaseSpecifier *DirectBaseSpec = 0; 2492 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2493 if (!Dependent) { 2494 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2495 BaseType)) 2496 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2497 2498 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2499 VirtualBaseSpec); 2500 2501 // C++ [base.class.init]p2: 2502 // Unless the mem-initializer-id names a nonstatic data member of the 2503 // constructor's class or a direct or virtual base of that class, the 2504 // mem-initializer is ill-formed. 2505 if (!DirectBaseSpec && !VirtualBaseSpec) { 2506 // If the class has any dependent bases, then it's possible that 2507 // one of those types will resolve to the same type as 2508 // BaseType. Therefore, just treat this as a dependent base 2509 // class initialization. FIXME: Should we try to check the 2510 // initialization anyway? It seems odd. 2511 if (ClassDecl->hasAnyDependentBases()) 2512 Dependent = true; 2513 else 2514 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2515 << BaseType << Context.getTypeDeclType(ClassDecl) 2516 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2517 } 2518 } 2519 2520 if (Dependent) { 2521 DiscardCleanupsInEvaluationContext(); 2522 2523 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2524 /*IsVirtual=*/false, 2525 InitRange.getBegin(), Init, 2526 InitRange.getEnd(), EllipsisLoc); 2527 } 2528 2529 // C++ [base.class.init]p2: 2530 // If a mem-initializer-id is ambiguous because it designates both 2531 // a direct non-virtual base class and an inherited virtual base 2532 // class, the mem-initializer is ill-formed. 2533 if (DirectBaseSpec && VirtualBaseSpec) 2534 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2535 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2536 2537 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2538 if (!BaseSpec) 2539 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2540 2541 // Initialize the base. 2542 bool InitList = true; 2543 Expr **Args = &Init; 2544 unsigned NumArgs = 1; 2545 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2546 InitList = false; 2547 Args = ParenList->getExprs(); 2548 NumArgs = ParenList->getNumExprs(); 2549 } 2550 2551 InitializedEntity BaseEntity = 2552 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2553 InitializationKind Kind = 2554 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2555 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2556 InitRange.getEnd()); 2557 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2558 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2559 MultiExprArg(Args, NumArgs), 0); 2560 if (BaseInit.isInvalid()) 2561 return true; 2562 2563 // C++11 [class.base.init]p7: 2564 // The initialization of each base and member constitutes a 2565 // full-expression. 2566 BaseInit = ActOnFinishFullExpr(BaseInit.get(), InitRange.getBegin()); 2567 if (BaseInit.isInvalid()) 2568 return true; 2569 2570 // If we are in a dependent context, template instantiation will 2571 // perform this type-checking again. Just save the arguments that we 2572 // received in a ParenListExpr. 2573 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2574 // of the information that we have about the base 2575 // initializer. However, deconstructing the ASTs is a dicey process, 2576 // and this approach is far more likely to get the corner cases right. 2577 if (CurContext->isDependentContext()) 2578 BaseInit = Owned(Init); 2579 2580 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2581 BaseSpec->isVirtual(), 2582 InitRange.getBegin(), 2583 BaseInit.takeAs<Expr>(), 2584 InitRange.getEnd(), EllipsisLoc); 2585} 2586 2587// Create a static_cast\<T&&>(expr). 2588static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2589 QualType ExprType = E->getType(); 2590 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2591 SourceLocation ExprLoc = E->getLocStart(); 2592 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2593 TargetType, ExprLoc); 2594 2595 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2596 SourceRange(ExprLoc, ExprLoc), 2597 E->getSourceRange()).take(); 2598} 2599 2600/// ImplicitInitializerKind - How an implicit base or member initializer should 2601/// initialize its base or member. 2602enum ImplicitInitializerKind { 2603 IIK_Default, 2604 IIK_Copy, 2605 IIK_Move 2606}; 2607 2608static bool 2609BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2610 ImplicitInitializerKind ImplicitInitKind, 2611 CXXBaseSpecifier *BaseSpec, 2612 bool IsInheritedVirtualBase, 2613 CXXCtorInitializer *&CXXBaseInit) { 2614 InitializedEntity InitEntity 2615 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2616 IsInheritedVirtualBase); 2617 2618 ExprResult BaseInit; 2619 2620 switch (ImplicitInitKind) { 2621 case IIK_Default: { 2622 InitializationKind InitKind 2623 = InitializationKind::CreateDefault(Constructor->getLocation()); 2624 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2625 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2626 break; 2627 } 2628 2629 case IIK_Move: 2630 case IIK_Copy: { 2631 bool Moving = ImplicitInitKind == IIK_Move; 2632 ParmVarDecl *Param = Constructor->getParamDecl(0); 2633 QualType ParamType = Param->getType().getNonReferenceType(); 2634 2635 Expr *CopyCtorArg = 2636 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2637 SourceLocation(), Param, false, 2638 Constructor->getLocation(), ParamType, 2639 VK_LValue, 0); 2640 2641 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2642 2643 // Cast to the base class to avoid ambiguities. 2644 QualType ArgTy = 2645 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2646 ParamType.getQualifiers()); 2647 2648 if (Moving) { 2649 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2650 } 2651 2652 CXXCastPath BasePath; 2653 BasePath.push_back(BaseSpec); 2654 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2655 CK_UncheckedDerivedToBase, 2656 Moving ? VK_XValue : VK_LValue, 2657 &BasePath).take(); 2658 2659 InitializationKind InitKind 2660 = InitializationKind::CreateDirect(Constructor->getLocation(), 2661 SourceLocation(), SourceLocation()); 2662 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2663 &CopyCtorArg, 1); 2664 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2665 MultiExprArg(&CopyCtorArg, 1)); 2666 break; 2667 } 2668 } 2669 2670 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2671 if (BaseInit.isInvalid()) 2672 return true; 2673 2674 CXXBaseInit = 2675 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2676 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2677 SourceLocation()), 2678 BaseSpec->isVirtual(), 2679 SourceLocation(), 2680 BaseInit.takeAs<Expr>(), 2681 SourceLocation(), 2682 SourceLocation()); 2683 2684 return false; 2685} 2686 2687static bool RefersToRValueRef(Expr *MemRef) { 2688 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2689 return Referenced->getType()->isRValueReferenceType(); 2690} 2691 2692static bool 2693BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2694 ImplicitInitializerKind ImplicitInitKind, 2695 FieldDecl *Field, IndirectFieldDecl *Indirect, 2696 CXXCtorInitializer *&CXXMemberInit) { 2697 if (Field->isInvalidDecl()) 2698 return true; 2699 2700 SourceLocation Loc = Constructor->getLocation(); 2701 2702 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2703 bool Moving = ImplicitInitKind == IIK_Move; 2704 ParmVarDecl *Param = Constructor->getParamDecl(0); 2705 QualType ParamType = Param->getType().getNonReferenceType(); 2706 2707 // Suppress copying zero-width bitfields. 2708 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2709 return false; 2710 2711 Expr *MemberExprBase = 2712 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2713 SourceLocation(), Param, false, 2714 Loc, ParamType, VK_LValue, 0); 2715 2716 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2717 2718 if (Moving) { 2719 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2720 } 2721 2722 // Build a reference to this field within the parameter. 2723 CXXScopeSpec SS; 2724 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2725 Sema::LookupMemberName); 2726 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2727 : cast<ValueDecl>(Field), AS_public); 2728 MemberLookup.resolveKind(); 2729 ExprResult CtorArg 2730 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2731 ParamType, Loc, 2732 /*IsArrow=*/false, 2733 SS, 2734 /*TemplateKWLoc=*/SourceLocation(), 2735 /*FirstQualifierInScope=*/0, 2736 MemberLookup, 2737 /*TemplateArgs=*/0); 2738 if (CtorArg.isInvalid()) 2739 return true; 2740 2741 // C++11 [class.copy]p15: 2742 // - if a member m has rvalue reference type T&&, it is direct-initialized 2743 // with static_cast<T&&>(x.m); 2744 if (RefersToRValueRef(CtorArg.get())) { 2745 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2746 } 2747 2748 // When the field we are copying is an array, create index variables for 2749 // each dimension of the array. We use these index variables to subscript 2750 // the source array, and other clients (e.g., CodeGen) will perform the 2751 // necessary iteration with these index variables. 2752 SmallVector<VarDecl *, 4> IndexVariables; 2753 QualType BaseType = Field->getType(); 2754 QualType SizeType = SemaRef.Context.getSizeType(); 2755 bool InitializingArray = false; 2756 while (const ConstantArrayType *Array 2757 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2758 InitializingArray = true; 2759 // Create the iteration variable for this array index. 2760 IdentifierInfo *IterationVarName = 0; 2761 { 2762 SmallString<8> Str; 2763 llvm::raw_svector_ostream OS(Str); 2764 OS << "__i" << IndexVariables.size(); 2765 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2766 } 2767 VarDecl *IterationVar 2768 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2769 IterationVarName, SizeType, 2770 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2771 SC_None, SC_None); 2772 IndexVariables.push_back(IterationVar); 2773 2774 // Create a reference to the iteration variable. 2775 ExprResult IterationVarRef 2776 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2777 assert(!IterationVarRef.isInvalid() && 2778 "Reference to invented variable cannot fail!"); 2779 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2780 assert(!IterationVarRef.isInvalid() && 2781 "Conversion of invented variable cannot fail!"); 2782 2783 // Subscript the array with this iteration variable. 2784 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2785 IterationVarRef.take(), 2786 Loc); 2787 if (CtorArg.isInvalid()) 2788 return true; 2789 2790 BaseType = Array->getElementType(); 2791 } 2792 2793 // The array subscript expression is an lvalue, which is wrong for moving. 2794 if (Moving && InitializingArray) 2795 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2796 2797 // Construct the entity that we will be initializing. For an array, this 2798 // will be first element in the array, which may require several levels 2799 // of array-subscript entities. 2800 SmallVector<InitializedEntity, 4> Entities; 2801 Entities.reserve(1 + IndexVariables.size()); 2802 if (Indirect) 2803 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2804 else 2805 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2806 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2807 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2808 0, 2809 Entities.back())); 2810 2811 // Direct-initialize to use the copy constructor. 2812 InitializationKind InitKind = 2813 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2814 2815 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2816 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2817 &CtorArgE, 1); 2818 2819 ExprResult MemberInit 2820 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2821 MultiExprArg(&CtorArgE, 1)); 2822 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2823 if (MemberInit.isInvalid()) 2824 return true; 2825 2826 if (Indirect) { 2827 assert(IndexVariables.size() == 0 && 2828 "Indirect field improperly initialized"); 2829 CXXMemberInit 2830 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2831 Loc, Loc, 2832 MemberInit.takeAs<Expr>(), 2833 Loc); 2834 } else 2835 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2836 Loc, MemberInit.takeAs<Expr>(), 2837 Loc, 2838 IndexVariables.data(), 2839 IndexVariables.size()); 2840 return false; 2841 } 2842 2843 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2844 2845 QualType FieldBaseElementType = 2846 SemaRef.Context.getBaseElementType(Field->getType()); 2847 2848 if (FieldBaseElementType->isRecordType()) { 2849 InitializedEntity InitEntity 2850 = Indirect? InitializedEntity::InitializeMember(Indirect) 2851 : InitializedEntity::InitializeMember(Field); 2852 InitializationKind InitKind = 2853 InitializationKind::CreateDefault(Loc); 2854 2855 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2856 ExprResult MemberInit = 2857 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2858 2859 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2860 if (MemberInit.isInvalid()) 2861 return true; 2862 2863 if (Indirect) 2864 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2865 Indirect, Loc, 2866 Loc, 2867 MemberInit.get(), 2868 Loc); 2869 else 2870 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2871 Field, Loc, Loc, 2872 MemberInit.get(), 2873 Loc); 2874 return false; 2875 } 2876 2877 if (!Field->getParent()->isUnion()) { 2878 if (FieldBaseElementType->isReferenceType()) { 2879 SemaRef.Diag(Constructor->getLocation(), 2880 diag::err_uninitialized_member_in_ctor) 2881 << (int)Constructor->isImplicit() 2882 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2883 << 0 << Field->getDeclName(); 2884 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2885 return true; 2886 } 2887 2888 if (FieldBaseElementType.isConstQualified()) { 2889 SemaRef.Diag(Constructor->getLocation(), 2890 diag::err_uninitialized_member_in_ctor) 2891 << (int)Constructor->isImplicit() 2892 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2893 << 1 << Field->getDeclName(); 2894 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2895 return true; 2896 } 2897 } 2898 2899 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2900 FieldBaseElementType->isObjCRetainableType() && 2901 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2902 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2903 // ARC: 2904 // Default-initialize Objective-C pointers to NULL. 2905 CXXMemberInit 2906 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2907 Loc, Loc, 2908 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2909 Loc); 2910 return false; 2911 } 2912 2913 // Nothing to initialize. 2914 CXXMemberInit = 0; 2915 return false; 2916} 2917 2918namespace { 2919struct BaseAndFieldInfo { 2920 Sema &S; 2921 CXXConstructorDecl *Ctor; 2922 bool AnyErrorsInInits; 2923 ImplicitInitializerKind IIK; 2924 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2925 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2926 2927 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2928 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2929 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2930 if (Generated && Ctor->isCopyConstructor()) 2931 IIK = IIK_Copy; 2932 else if (Generated && Ctor->isMoveConstructor()) 2933 IIK = IIK_Move; 2934 else 2935 IIK = IIK_Default; 2936 } 2937 2938 bool isImplicitCopyOrMove() const { 2939 switch (IIK) { 2940 case IIK_Copy: 2941 case IIK_Move: 2942 return true; 2943 2944 case IIK_Default: 2945 return false; 2946 } 2947 2948 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2949 } 2950 2951 bool addFieldInitializer(CXXCtorInitializer *Init) { 2952 AllToInit.push_back(Init); 2953 2954 // Check whether this initializer makes the field "used". 2955 if (Init->getInit() && Init->getInit()->HasSideEffects(S.Context)) 2956 S.UnusedPrivateFields.remove(Init->getAnyMember()); 2957 2958 return false; 2959 } 2960}; 2961} 2962 2963/// \brief Determine whether the given indirect field declaration is somewhere 2964/// within an anonymous union. 2965static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2966 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2967 CEnd = F->chain_end(); 2968 C != CEnd; ++C) 2969 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2970 if (Record->isUnion()) 2971 return true; 2972 2973 return false; 2974} 2975 2976/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2977/// array type. 2978static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2979 if (T->isIncompleteArrayType()) 2980 return true; 2981 2982 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2983 if (!ArrayT->getSize()) 2984 return true; 2985 2986 T = ArrayT->getElementType(); 2987 } 2988 2989 return false; 2990} 2991 2992static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2993 FieldDecl *Field, 2994 IndirectFieldDecl *Indirect = 0) { 2995 2996 // Overwhelmingly common case: we have a direct initializer for this field. 2997 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) 2998 return Info.addFieldInitializer(Init); 2999 3000 // C++11 [class.base.init]p8: if the entity is a non-static data member that 3001 // has a brace-or-equal-initializer, the entity is initialized as specified 3002 // in [dcl.init]. 3003 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 3004 CXXCtorInitializer *Init; 3005 if (Indirect) 3006 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 3007 SourceLocation(), 3008 SourceLocation(), 0, 3009 SourceLocation()); 3010 else 3011 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 3012 SourceLocation(), 3013 SourceLocation(), 0, 3014 SourceLocation()); 3015 return Info.addFieldInitializer(Init); 3016 } 3017 3018 // Don't build an implicit initializer for union members if none was 3019 // explicitly specified. 3020 if (Field->getParent()->isUnion() || 3021 (Indirect && isWithinAnonymousUnion(Indirect))) 3022 return false; 3023 3024 // Don't initialize incomplete or zero-length arrays. 3025 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 3026 return false; 3027 3028 // Don't try to build an implicit initializer if there were semantic 3029 // errors in any of the initializers (and therefore we might be 3030 // missing some that the user actually wrote). 3031 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 3032 return false; 3033 3034 CXXCtorInitializer *Init = 0; 3035 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 3036 Indirect, Init)) 3037 return true; 3038 3039 if (!Init) 3040 return false; 3041 3042 return Info.addFieldInitializer(Init); 3043} 3044 3045bool 3046Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 3047 CXXCtorInitializer *Initializer) { 3048 assert(Initializer->isDelegatingInitializer()); 3049 Constructor->setNumCtorInitializers(1); 3050 CXXCtorInitializer **initializer = 3051 new (Context) CXXCtorInitializer*[1]; 3052 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 3053 Constructor->setCtorInitializers(initializer); 3054 3055 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 3056 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 3057 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 3058 } 3059 3060 DelegatingCtorDecls.push_back(Constructor); 3061 3062 return false; 3063} 3064 3065bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 3066 CXXCtorInitializer **Initializers, 3067 unsigned NumInitializers, 3068 bool AnyErrors) { 3069 if (Constructor->isDependentContext()) { 3070 // Just store the initializers as written, they will be checked during 3071 // instantiation. 3072 if (NumInitializers > 0) { 3073 Constructor->setNumCtorInitializers(NumInitializers); 3074 CXXCtorInitializer **baseOrMemberInitializers = 3075 new (Context) CXXCtorInitializer*[NumInitializers]; 3076 memcpy(baseOrMemberInitializers, Initializers, 3077 NumInitializers * sizeof(CXXCtorInitializer*)); 3078 Constructor->setCtorInitializers(baseOrMemberInitializers); 3079 } 3080 3081 // Let template instantiation know whether we had errors. 3082 if (AnyErrors) 3083 Constructor->setInvalidDecl(); 3084 3085 return false; 3086 } 3087 3088 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 3089 3090 // We need to build the initializer AST according to order of construction 3091 // and not what user specified in the Initializers list. 3092 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 3093 if (!ClassDecl) 3094 return true; 3095 3096 bool HadError = false; 3097 3098 for (unsigned i = 0; i < NumInitializers; i++) { 3099 CXXCtorInitializer *Member = Initializers[i]; 3100 3101 if (Member->isBaseInitializer()) 3102 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 3103 else 3104 Info.AllBaseFields[Member->getAnyMember()] = Member; 3105 } 3106 3107 // Keep track of the direct virtual bases. 3108 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 3109 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 3110 E = ClassDecl->bases_end(); I != E; ++I) { 3111 if (I->isVirtual()) 3112 DirectVBases.insert(I); 3113 } 3114 3115 // Push virtual bases before others. 3116 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3117 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3118 3119 if (CXXCtorInitializer *Value 3120 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 3121 Info.AllToInit.push_back(Value); 3122 } else if (!AnyErrors) { 3123 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 3124 CXXCtorInitializer *CXXBaseInit; 3125 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3126 VBase, IsInheritedVirtualBase, 3127 CXXBaseInit)) { 3128 HadError = true; 3129 continue; 3130 } 3131 3132 Info.AllToInit.push_back(CXXBaseInit); 3133 } 3134 } 3135 3136 // Non-virtual bases. 3137 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3138 E = ClassDecl->bases_end(); Base != E; ++Base) { 3139 // Virtuals are in the virtual base list and already constructed. 3140 if (Base->isVirtual()) 3141 continue; 3142 3143 if (CXXCtorInitializer *Value 3144 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3145 Info.AllToInit.push_back(Value); 3146 } else if (!AnyErrors) { 3147 CXXCtorInitializer *CXXBaseInit; 3148 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3149 Base, /*IsInheritedVirtualBase=*/false, 3150 CXXBaseInit)) { 3151 HadError = true; 3152 continue; 3153 } 3154 3155 Info.AllToInit.push_back(CXXBaseInit); 3156 } 3157 } 3158 3159 // Fields. 3160 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3161 MemEnd = ClassDecl->decls_end(); 3162 Mem != MemEnd; ++Mem) { 3163 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3164 // C++ [class.bit]p2: 3165 // A declaration for a bit-field that omits the identifier declares an 3166 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3167 // initialized. 3168 if (F->isUnnamedBitfield()) 3169 continue; 3170 3171 // If we're not generating the implicit copy/move constructor, then we'll 3172 // handle anonymous struct/union fields based on their individual 3173 // indirect fields. 3174 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 3175 continue; 3176 3177 if (CollectFieldInitializer(*this, Info, F)) 3178 HadError = true; 3179 continue; 3180 } 3181 3182 // Beyond this point, we only consider default initialization. 3183 if (Info.IIK != IIK_Default) 3184 continue; 3185 3186 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3187 if (F->getType()->isIncompleteArrayType()) { 3188 assert(ClassDecl->hasFlexibleArrayMember() && 3189 "Incomplete array type is not valid"); 3190 continue; 3191 } 3192 3193 // Initialize each field of an anonymous struct individually. 3194 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3195 HadError = true; 3196 3197 continue; 3198 } 3199 } 3200 3201 NumInitializers = Info.AllToInit.size(); 3202 if (NumInitializers > 0) { 3203 Constructor->setNumCtorInitializers(NumInitializers); 3204 CXXCtorInitializer **baseOrMemberInitializers = 3205 new (Context) CXXCtorInitializer*[NumInitializers]; 3206 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3207 NumInitializers * sizeof(CXXCtorInitializer*)); 3208 Constructor->setCtorInitializers(baseOrMemberInitializers); 3209 3210 // Constructors implicitly reference the base and member 3211 // destructors. 3212 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3213 Constructor->getParent()); 3214 } 3215 3216 return HadError; 3217} 3218 3219static void *GetKeyForTopLevelField(FieldDecl *Field) { 3220 // For anonymous unions, use the class declaration as the key. 3221 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3222 if (RT->getDecl()->isAnonymousStructOrUnion()) 3223 return RT->getDecl(); 3224 } 3225 return Field; 3226} 3227 3228static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3229 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3230} 3231 3232static void *GetKeyForMember(ASTContext &Context, 3233 CXXCtorInitializer *Member) { 3234 if (!Member->isAnyMemberInitializer()) 3235 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3236 3237 // For fields injected into the class via declaration of an anonymous union, 3238 // use its anonymous union class declaration as the unique key. 3239 FieldDecl *Field = Member->getAnyMember(); 3240 3241 // If the field is a member of an anonymous struct or union, our key 3242 // is the anonymous record decl that's a direct child of the class. 3243 RecordDecl *RD = Field->getParent(); 3244 if (RD->isAnonymousStructOrUnion()) { 3245 while (true) { 3246 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3247 if (Parent->isAnonymousStructOrUnion()) 3248 RD = Parent; 3249 else 3250 break; 3251 } 3252 3253 return RD; 3254 } 3255 3256 return Field; 3257} 3258 3259static void 3260DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3261 const CXXConstructorDecl *Constructor, 3262 CXXCtorInitializer **Inits, 3263 unsigned NumInits) { 3264 if (Constructor->getDeclContext()->isDependentContext()) 3265 return; 3266 3267 // Don't check initializers order unless the warning is enabled at the 3268 // location of at least one initializer. 3269 bool ShouldCheckOrder = false; 3270 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3271 CXXCtorInitializer *Init = Inits[InitIndex]; 3272 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3273 Init->getSourceLocation()) 3274 != DiagnosticsEngine::Ignored) { 3275 ShouldCheckOrder = true; 3276 break; 3277 } 3278 } 3279 if (!ShouldCheckOrder) 3280 return; 3281 3282 // Build the list of bases and members in the order that they'll 3283 // actually be initialized. The explicit initializers should be in 3284 // this same order but may be missing things. 3285 SmallVector<const void*, 32> IdealInitKeys; 3286 3287 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3288 3289 // 1. Virtual bases. 3290 for (CXXRecordDecl::base_class_const_iterator VBase = 3291 ClassDecl->vbases_begin(), 3292 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3293 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3294 3295 // 2. Non-virtual bases. 3296 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3297 E = ClassDecl->bases_end(); Base != E; ++Base) { 3298 if (Base->isVirtual()) 3299 continue; 3300 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3301 } 3302 3303 // 3. Direct fields. 3304 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3305 E = ClassDecl->field_end(); Field != E; ++Field) { 3306 if (Field->isUnnamedBitfield()) 3307 continue; 3308 3309 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3310 } 3311 3312 unsigned NumIdealInits = IdealInitKeys.size(); 3313 unsigned IdealIndex = 0; 3314 3315 CXXCtorInitializer *PrevInit = 0; 3316 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3317 CXXCtorInitializer *Init = Inits[InitIndex]; 3318 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3319 3320 // Scan forward to try to find this initializer in the idealized 3321 // initializers list. 3322 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3323 if (InitKey == IdealInitKeys[IdealIndex]) 3324 break; 3325 3326 // If we didn't find this initializer, it must be because we 3327 // scanned past it on a previous iteration. That can only 3328 // happen if we're out of order; emit a warning. 3329 if (IdealIndex == NumIdealInits && PrevInit) { 3330 Sema::SemaDiagnosticBuilder D = 3331 SemaRef.Diag(PrevInit->getSourceLocation(), 3332 diag::warn_initializer_out_of_order); 3333 3334 if (PrevInit->isAnyMemberInitializer()) 3335 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3336 else 3337 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3338 3339 if (Init->isAnyMemberInitializer()) 3340 D << 0 << Init->getAnyMember()->getDeclName(); 3341 else 3342 D << 1 << Init->getTypeSourceInfo()->getType(); 3343 3344 // Move back to the initializer's location in the ideal list. 3345 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3346 if (InitKey == IdealInitKeys[IdealIndex]) 3347 break; 3348 3349 assert(IdealIndex != NumIdealInits && 3350 "initializer not found in initializer list"); 3351 } 3352 3353 PrevInit = Init; 3354 } 3355} 3356 3357namespace { 3358bool CheckRedundantInit(Sema &S, 3359 CXXCtorInitializer *Init, 3360 CXXCtorInitializer *&PrevInit) { 3361 if (!PrevInit) { 3362 PrevInit = Init; 3363 return false; 3364 } 3365 3366 if (FieldDecl *Field = Init->getMember()) 3367 S.Diag(Init->getSourceLocation(), 3368 diag::err_multiple_mem_initialization) 3369 << Field->getDeclName() 3370 << Init->getSourceRange(); 3371 else { 3372 const Type *BaseClass = Init->getBaseClass(); 3373 assert(BaseClass && "neither field nor base"); 3374 S.Diag(Init->getSourceLocation(), 3375 diag::err_multiple_base_initialization) 3376 << QualType(BaseClass, 0) 3377 << Init->getSourceRange(); 3378 } 3379 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3380 << 0 << PrevInit->getSourceRange(); 3381 3382 return true; 3383} 3384 3385typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3386typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3387 3388bool CheckRedundantUnionInit(Sema &S, 3389 CXXCtorInitializer *Init, 3390 RedundantUnionMap &Unions) { 3391 FieldDecl *Field = Init->getAnyMember(); 3392 RecordDecl *Parent = Field->getParent(); 3393 NamedDecl *Child = Field; 3394 3395 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3396 if (Parent->isUnion()) { 3397 UnionEntry &En = Unions[Parent]; 3398 if (En.first && En.first != Child) { 3399 S.Diag(Init->getSourceLocation(), 3400 diag::err_multiple_mem_union_initialization) 3401 << Field->getDeclName() 3402 << Init->getSourceRange(); 3403 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3404 << 0 << En.second->getSourceRange(); 3405 return true; 3406 } 3407 if (!En.first) { 3408 En.first = Child; 3409 En.second = Init; 3410 } 3411 if (!Parent->isAnonymousStructOrUnion()) 3412 return false; 3413 } 3414 3415 Child = Parent; 3416 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3417 } 3418 3419 return false; 3420} 3421} 3422 3423/// ActOnMemInitializers - Handle the member initializers for a constructor. 3424void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3425 SourceLocation ColonLoc, 3426 CXXCtorInitializer **meminits, 3427 unsigned NumMemInits, 3428 bool AnyErrors) { 3429 if (!ConstructorDecl) 3430 return; 3431 3432 AdjustDeclIfTemplate(ConstructorDecl); 3433 3434 CXXConstructorDecl *Constructor 3435 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3436 3437 if (!Constructor) { 3438 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3439 return; 3440 } 3441 3442 CXXCtorInitializer **MemInits = 3443 reinterpret_cast<CXXCtorInitializer **>(meminits); 3444 3445 // Mapping for the duplicate initializers check. 3446 // For member initializers, this is keyed with a FieldDecl*. 3447 // For base initializers, this is keyed with a Type*. 3448 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3449 3450 // Mapping for the inconsistent anonymous-union initializers check. 3451 RedundantUnionMap MemberUnions; 3452 3453 bool HadError = false; 3454 for (unsigned i = 0; i < NumMemInits; i++) { 3455 CXXCtorInitializer *Init = MemInits[i]; 3456 3457 // Set the source order index. 3458 Init->setSourceOrder(i); 3459 3460 if (Init->isAnyMemberInitializer()) { 3461 FieldDecl *Field = Init->getAnyMember(); 3462 if (CheckRedundantInit(*this, Init, Members[Field]) || 3463 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3464 HadError = true; 3465 } else if (Init->isBaseInitializer()) { 3466 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3467 if (CheckRedundantInit(*this, Init, Members[Key])) 3468 HadError = true; 3469 } else { 3470 assert(Init->isDelegatingInitializer()); 3471 // This must be the only initializer 3472 if (NumMemInits != 1) { 3473 Diag(Init->getSourceLocation(), 3474 diag::err_delegating_initializer_alone) 3475 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange(); 3476 // We will treat this as being the only initializer. 3477 } 3478 SetDelegatingInitializer(Constructor, MemInits[i]); 3479 // Return immediately as the initializer is set. 3480 return; 3481 } 3482 } 3483 3484 if (HadError) 3485 return; 3486 3487 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3488 3489 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3490} 3491 3492void 3493Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3494 CXXRecordDecl *ClassDecl) { 3495 // Ignore dependent contexts. Also ignore unions, since their members never 3496 // have destructors implicitly called. 3497 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3498 return; 3499 3500 // FIXME: all the access-control diagnostics are positioned on the 3501 // field/base declaration. That's probably good; that said, the 3502 // user might reasonably want to know why the destructor is being 3503 // emitted, and we currently don't say. 3504 3505 // Non-static data members. 3506 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3507 E = ClassDecl->field_end(); I != E; ++I) { 3508 FieldDecl *Field = *I; 3509 if (Field->isInvalidDecl()) 3510 continue; 3511 3512 // Don't destroy incomplete or zero-length arrays. 3513 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3514 continue; 3515 3516 QualType FieldType = Context.getBaseElementType(Field->getType()); 3517 3518 const RecordType* RT = FieldType->getAs<RecordType>(); 3519 if (!RT) 3520 continue; 3521 3522 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3523 if (FieldClassDecl->isInvalidDecl()) 3524 continue; 3525 if (FieldClassDecl->hasIrrelevantDestructor()) 3526 continue; 3527 // The destructor for an implicit anonymous union member is never invoked. 3528 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3529 continue; 3530 3531 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3532 assert(Dtor && "No dtor found for FieldClassDecl!"); 3533 CheckDestructorAccess(Field->getLocation(), Dtor, 3534 PDiag(diag::err_access_dtor_field) 3535 << Field->getDeclName() 3536 << FieldType); 3537 3538 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3539 DiagnoseUseOfDecl(Dtor, Location); 3540 } 3541 3542 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3543 3544 // Bases. 3545 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3546 E = ClassDecl->bases_end(); Base != E; ++Base) { 3547 // Bases are always records in a well-formed non-dependent class. 3548 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3549 3550 // Remember direct virtual bases. 3551 if (Base->isVirtual()) 3552 DirectVirtualBases.insert(RT); 3553 3554 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3555 // If our base class is invalid, we probably can't get its dtor anyway. 3556 if (BaseClassDecl->isInvalidDecl()) 3557 continue; 3558 if (BaseClassDecl->hasIrrelevantDestructor()) 3559 continue; 3560 3561 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3562 assert(Dtor && "No dtor found for BaseClassDecl!"); 3563 3564 // FIXME: caret should be on the start of the class name 3565 CheckDestructorAccess(Base->getLocStart(), Dtor, 3566 PDiag(diag::err_access_dtor_base) 3567 << Base->getType() 3568 << Base->getSourceRange(), 3569 Context.getTypeDeclType(ClassDecl)); 3570 3571 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3572 DiagnoseUseOfDecl(Dtor, Location); 3573 } 3574 3575 // Virtual bases. 3576 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3577 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3578 3579 // Bases are always records in a well-formed non-dependent class. 3580 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3581 3582 // Ignore direct virtual bases. 3583 if (DirectVirtualBases.count(RT)) 3584 continue; 3585 3586 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3587 // If our base class is invalid, we probably can't get its dtor anyway. 3588 if (BaseClassDecl->isInvalidDecl()) 3589 continue; 3590 if (BaseClassDecl->hasIrrelevantDestructor()) 3591 continue; 3592 3593 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3594 assert(Dtor && "No dtor found for BaseClassDecl!"); 3595 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3596 PDiag(diag::err_access_dtor_vbase) 3597 << VBase->getType(), 3598 Context.getTypeDeclType(ClassDecl)); 3599 3600 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3601 DiagnoseUseOfDecl(Dtor, Location); 3602 } 3603} 3604 3605void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3606 if (!CDtorDecl) 3607 return; 3608 3609 if (CXXConstructorDecl *Constructor 3610 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3611 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3612} 3613 3614bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3615 unsigned DiagID, AbstractDiagSelID SelID) { 3616 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3617 unsigned DiagID; 3618 AbstractDiagSelID SelID; 3619 3620 public: 3621 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3622 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3623 3624 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 3625 if (Suppressed) return; 3626 if (SelID == -1) 3627 S.Diag(Loc, DiagID) << T; 3628 else 3629 S.Diag(Loc, DiagID) << SelID << T; 3630 } 3631 } Diagnoser(DiagID, SelID); 3632 3633 return RequireNonAbstractType(Loc, T, Diagnoser); 3634} 3635 3636bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3637 TypeDiagnoser &Diagnoser) { 3638 if (!getLangOpts().CPlusPlus) 3639 return false; 3640 3641 if (const ArrayType *AT = Context.getAsArrayType(T)) 3642 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3643 3644 if (const PointerType *PT = T->getAs<PointerType>()) { 3645 // Find the innermost pointer type. 3646 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3647 PT = T; 3648 3649 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3650 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3651 } 3652 3653 const RecordType *RT = T->getAs<RecordType>(); 3654 if (!RT) 3655 return false; 3656 3657 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3658 3659 // We can't answer whether something is abstract until it has a 3660 // definition. If it's currently being defined, we'll walk back 3661 // over all the declarations when we have a full definition. 3662 const CXXRecordDecl *Def = RD->getDefinition(); 3663 if (!Def || Def->isBeingDefined()) 3664 return false; 3665 3666 if (!RD->isAbstract()) 3667 return false; 3668 3669 Diagnoser.diagnose(*this, Loc, T); 3670 DiagnoseAbstractType(RD); 3671 3672 return true; 3673} 3674 3675void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3676 // Check if we've already emitted the list of pure virtual functions 3677 // for this class. 3678 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3679 return; 3680 3681 CXXFinalOverriderMap FinalOverriders; 3682 RD->getFinalOverriders(FinalOverriders); 3683 3684 // Keep a set of seen pure methods so we won't diagnose the same method 3685 // more than once. 3686 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3687 3688 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3689 MEnd = FinalOverriders.end(); 3690 M != MEnd; 3691 ++M) { 3692 for (OverridingMethods::iterator SO = M->second.begin(), 3693 SOEnd = M->second.end(); 3694 SO != SOEnd; ++SO) { 3695 // C++ [class.abstract]p4: 3696 // A class is abstract if it contains or inherits at least one 3697 // pure virtual function for which the final overrider is pure 3698 // virtual. 3699 3700 // 3701 if (SO->second.size() != 1) 3702 continue; 3703 3704 if (!SO->second.front().Method->isPure()) 3705 continue; 3706 3707 if (!SeenPureMethods.insert(SO->second.front().Method)) 3708 continue; 3709 3710 Diag(SO->second.front().Method->getLocation(), 3711 diag::note_pure_virtual_function) 3712 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3713 } 3714 } 3715 3716 if (!PureVirtualClassDiagSet) 3717 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3718 PureVirtualClassDiagSet->insert(RD); 3719} 3720 3721namespace { 3722struct AbstractUsageInfo { 3723 Sema &S; 3724 CXXRecordDecl *Record; 3725 CanQualType AbstractType; 3726 bool Invalid; 3727 3728 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3729 : S(S), Record(Record), 3730 AbstractType(S.Context.getCanonicalType( 3731 S.Context.getTypeDeclType(Record))), 3732 Invalid(false) {} 3733 3734 void DiagnoseAbstractType() { 3735 if (Invalid) return; 3736 S.DiagnoseAbstractType(Record); 3737 Invalid = true; 3738 } 3739 3740 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3741}; 3742 3743struct CheckAbstractUsage { 3744 AbstractUsageInfo &Info; 3745 const NamedDecl *Ctx; 3746 3747 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3748 : Info(Info), Ctx(Ctx) {} 3749 3750 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3751 switch (TL.getTypeLocClass()) { 3752#define ABSTRACT_TYPELOC(CLASS, PARENT) 3753#define TYPELOC(CLASS, PARENT) \ 3754 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3755#include "clang/AST/TypeLocNodes.def" 3756 } 3757 } 3758 3759 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3760 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3761 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3762 if (!TL.getArg(I)) 3763 continue; 3764 3765 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3766 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3767 } 3768 } 3769 3770 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3771 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3772 } 3773 3774 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3775 // Visit the type parameters from a permissive context. 3776 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3777 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3778 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3779 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3780 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3781 // TODO: other template argument types? 3782 } 3783 } 3784 3785 // Visit pointee types from a permissive context. 3786#define CheckPolymorphic(Type) \ 3787 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3788 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3789 } 3790 CheckPolymorphic(PointerTypeLoc) 3791 CheckPolymorphic(ReferenceTypeLoc) 3792 CheckPolymorphic(MemberPointerTypeLoc) 3793 CheckPolymorphic(BlockPointerTypeLoc) 3794 CheckPolymorphic(AtomicTypeLoc) 3795 3796 /// Handle all the types we haven't given a more specific 3797 /// implementation for above. 3798 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3799 // Every other kind of type that we haven't called out already 3800 // that has an inner type is either (1) sugar or (2) contains that 3801 // inner type in some way as a subobject. 3802 if (TypeLoc Next = TL.getNextTypeLoc()) 3803 return Visit(Next, Sel); 3804 3805 // If there's no inner type and we're in a permissive context, 3806 // don't diagnose. 3807 if (Sel == Sema::AbstractNone) return; 3808 3809 // Check whether the type matches the abstract type. 3810 QualType T = TL.getType(); 3811 if (T->isArrayType()) { 3812 Sel = Sema::AbstractArrayType; 3813 T = Info.S.Context.getBaseElementType(T); 3814 } 3815 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3816 if (CT != Info.AbstractType) return; 3817 3818 // It matched; do some magic. 3819 if (Sel == Sema::AbstractArrayType) { 3820 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3821 << T << TL.getSourceRange(); 3822 } else { 3823 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3824 << Sel << T << TL.getSourceRange(); 3825 } 3826 Info.DiagnoseAbstractType(); 3827 } 3828}; 3829 3830void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3831 Sema::AbstractDiagSelID Sel) { 3832 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3833} 3834 3835} 3836 3837/// Check for invalid uses of an abstract type in a method declaration. 3838static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3839 CXXMethodDecl *MD) { 3840 // No need to do the check on definitions, which require that 3841 // the return/param types be complete. 3842 if (MD->doesThisDeclarationHaveABody()) 3843 return; 3844 3845 // For safety's sake, just ignore it if we don't have type source 3846 // information. This should never happen for non-implicit methods, 3847 // but... 3848 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3849 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3850} 3851 3852/// Check for invalid uses of an abstract type within a class definition. 3853static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3854 CXXRecordDecl *RD) { 3855 for (CXXRecordDecl::decl_iterator 3856 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3857 Decl *D = *I; 3858 if (D->isImplicit()) continue; 3859 3860 // Methods and method templates. 3861 if (isa<CXXMethodDecl>(D)) { 3862 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3863 } else if (isa<FunctionTemplateDecl>(D)) { 3864 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3865 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3866 3867 // Fields and static variables. 3868 } else if (isa<FieldDecl>(D)) { 3869 FieldDecl *FD = cast<FieldDecl>(D); 3870 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3871 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3872 } else if (isa<VarDecl>(D)) { 3873 VarDecl *VD = cast<VarDecl>(D); 3874 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3875 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3876 3877 // Nested classes and class templates. 3878 } else if (isa<CXXRecordDecl>(D)) { 3879 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3880 } else if (isa<ClassTemplateDecl>(D)) { 3881 CheckAbstractClassUsage(Info, 3882 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3883 } 3884 } 3885} 3886 3887/// \brief Perform semantic checks on a class definition that has been 3888/// completing, introducing implicitly-declared members, checking for 3889/// abstract types, etc. 3890void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3891 if (!Record) 3892 return; 3893 3894 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3895 AbstractUsageInfo Info(*this, Record); 3896 CheckAbstractClassUsage(Info, Record); 3897 } 3898 3899 // If this is not an aggregate type and has no user-declared constructor, 3900 // complain about any non-static data members of reference or const scalar 3901 // type, since they will never get initializers. 3902 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3903 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3904 !Record->isLambda()) { 3905 bool Complained = false; 3906 for (RecordDecl::field_iterator F = Record->field_begin(), 3907 FEnd = Record->field_end(); 3908 F != FEnd; ++F) { 3909 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3910 continue; 3911 3912 if (F->getType()->isReferenceType() || 3913 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3914 if (!Complained) { 3915 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3916 << Record->getTagKind() << Record; 3917 Complained = true; 3918 } 3919 3920 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3921 << F->getType()->isReferenceType() 3922 << F->getDeclName(); 3923 } 3924 } 3925 } 3926 3927 if (Record->isDynamicClass() && !Record->isDependentType()) 3928 DynamicClasses.push_back(Record); 3929 3930 if (Record->getIdentifier()) { 3931 // C++ [class.mem]p13: 3932 // If T is the name of a class, then each of the following shall have a 3933 // name different from T: 3934 // - every member of every anonymous union that is a member of class T. 3935 // 3936 // C++ [class.mem]p14: 3937 // In addition, if class T has a user-declared constructor (12.1), every 3938 // non-static data member of class T shall have a name different from T. 3939 DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3940 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 3941 ++I) { 3942 NamedDecl *D = *I; 3943 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3944 isa<IndirectFieldDecl>(D)) { 3945 Diag(D->getLocation(), diag::err_member_name_of_class) 3946 << D->getDeclName(); 3947 break; 3948 } 3949 } 3950 } 3951 3952 // Warn if the class has virtual methods but non-virtual public destructor. 3953 if (Record->isPolymorphic() && !Record->isDependentType()) { 3954 CXXDestructorDecl *dtor = Record->getDestructor(); 3955 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3956 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3957 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3958 } 3959 3960 if (Record->isAbstract() && Record->hasAttr<FinalAttr>()) { 3961 Diag(Record->getLocation(), diag::warn_abstract_final_class); 3962 DiagnoseAbstractType(Record); 3963 } 3964 3965 if (!Record->isDependentType()) { 3966 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3967 MEnd = Record->method_end(); 3968 M != MEnd; ++M) { 3969 // See if a method overloads virtual methods in a base 3970 // class without overriding any. 3971 if (!M->isStatic()) 3972 DiagnoseHiddenVirtualMethods(Record, *M); 3973 3974 // Check whether the explicitly-defaulted special members are valid. 3975 if (!M->isInvalidDecl() && M->isExplicitlyDefaulted()) 3976 CheckExplicitlyDefaultedSpecialMember(*M); 3977 3978 // For an explicitly defaulted or deleted special member, we defer 3979 // determining triviality until the class is complete. That time is now! 3980 if (!M->isImplicit() && !M->isUserProvided()) { 3981 CXXSpecialMember CSM = getSpecialMember(*M); 3982 if (CSM != CXXInvalid) { 3983 M->setTrivial(SpecialMemberIsTrivial(*M, CSM)); 3984 3985 // Inform the class that we've finished declaring this member. 3986 Record->finishedDefaultedOrDeletedMember(*M); 3987 } 3988 } 3989 } 3990 } 3991 3992 // C++11 [dcl.constexpr]p8: A constexpr specifier for a non-static member 3993 // function that is not a constructor declares that member function to be 3994 // const. [...] The class of which that function is a member shall be 3995 // a literal type. 3996 // 3997 // If the class has virtual bases, any constexpr members will already have 3998 // been diagnosed by the checks performed on the member declaration, so 3999 // suppress this (less useful) diagnostic. 4000 // 4001 // We delay this until we know whether an explicitly-defaulted (or deleted) 4002 // destructor for the class is trivial. 4003 if (LangOpts.CPlusPlus11 && !Record->isDependentType() && 4004 !Record->isLiteral() && !Record->getNumVBases()) { 4005 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 4006 MEnd = Record->method_end(); 4007 M != MEnd; ++M) { 4008 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 4009 switch (Record->getTemplateSpecializationKind()) { 4010 case TSK_ImplicitInstantiation: 4011 case TSK_ExplicitInstantiationDeclaration: 4012 case TSK_ExplicitInstantiationDefinition: 4013 // If a template instantiates to a non-literal type, but its members 4014 // instantiate to constexpr functions, the template is technically 4015 // ill-formed, but we allow it for sanity. 4016 continue; 4017 4018 case TSK_Undeclared: 4019 case TSK_ExplicitSpecialization: 4020 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 4021 diag::err_constexpr_method_non_literal); 4022 break; 4023 } 4024 4025 // Only produce one error per class. 4026 break; 4027 } 4028 } 4029 } 4030 4031 // Declare inherited constructors. We do this eagerly here because: 4032 // - The standard requires an eager diagnostic for conflicting inherited 4033 // constructors from different classes. 4034 // - The lazy declaration of the other implicit constructors is so as to not 4035 // waste space and performance on classes that are not meant to be 4036 // instantiated (e.g. meta-functions). This doesn't apply to classes that 4037 // have inherited constructors. 4038 DeclareInheritedConstructors(Record); 4039} 4040 4041/// Is the special member function which would be selected to perform the 4042/// specified operation on the specified class type a constexpr constructor? 4043static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4044 Sema::CXXSpecialMember CSM, 4045 bool ConstArg) { 4046 Sema::SpecialMemberOverloadResult *SMOR = 4047 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 4048 false, false, false, false); 4049 if (!SMOR || !SMOR->getMethod()) 4050 // A constructor we wouldn't select can't be "involved in initializing" 4051 // anything. 4052 return true; 4053 return SMOR->getMethod()->isConstexpr(); 4054} 4055 4056/// Determine whether the specified special member function would be constexpr 4057/// if it were implicitly defined. 4058static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4059 Sema::CXXSpecialMember CSM, 4060 bool ConstArg) { 4061 if (!S.getLangOpts().CPlusPlus11) 4062 return false; 4063 4064 // C++11 [dcl.constexpr]p4: 4065 // In the definition of a constexpr constructor [...] 4066 switch (CSM) { 4067 case Sema::CXXDefaultConstructor: 4068 // Since default constructor lookup is essentially trivial (and cannot 4069 // involve, for instance, template instantiation), we compute whether a 4070 // defaulted default constructor is constexpr directly within CXXRecordDecl. 4071 // 4072 // This is important for performance; we need to know whether the default 4073 // constructor is constexpr to determine whether the type is a literal type. 4074 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 4075 4076 case Sema::CXXCopyConstructor: 4077 case Sema::CXXMoveConstructor: 4078 // For copy or move constructors, we need to perform overload resolution. 4079 break; 4080 4081 case Sema::CXXCopyAssignment: 4082 case Sema::CXXMoveAssignment: 4083 case Sema::CXXDestructor: 4084 case Sema::CXXInvalid: 4085 return false; 4086 } 4087 4088 // -- if the class is a non-empty union, or for each non-empty anonymous 4089 // union member of a non-union class, exactly one non-static data member 4090 // shall be initialized; [DR1359] 4091 // 4092 // If we squint, this is guaranteed, since exactly one non-static data member 4093 // will be initialized (if the constructor isn't deleted), we just don't know 4094 // which one. 4095 if (ClassDecl->isUnion()) 4096 return true; 4097 4098 // -- the class shall not have any virtual base classes; 4099 if (ClassDecl->getNumVBases()) 4100 return false; 4101 4102 // -- every constructor involved in initializing [...] base class 4103 // sub-objects shall be a constexpr constructor; 4104 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4105 BEnd = ClassDecl->bases_end(); 4106 B != BEnd; ++B) { 4107 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 4108 if (!BaseType) continue; 4109 4110 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4111 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 4112 return false; 4113 } 4114 4115 // -- every constructor involved in initializing non-static data members 4116 // [...] shall be a constexpr constructor; 4117 // -- every non-static data member and base class sub-object shall be 4118 // initialized 4119 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4120 FEnd = ClassDecl->field_end(); 4121 F != FEnd; ++F) { 4122 if (F->isInvalidDecl()) 4123 continue; 4124 if (const RecordType *RecordTy = 4125 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4126 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4127 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 4128 return false; 4129 } 4130 } 4131 4132 // All OK, it's constexpr! 4133 return true; 4134} 4135 4136static Sema::ImplicitExceptionSpecification 4137computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 4138 switch (S.getSpecialMember(MD)) { 4139 case Sema::CXXDefaultConstructor: 4140 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 4141 case Sema::CXXCopyConstructor: 4142 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 4143 case Sema::CXXCopyAssignment: 4144 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 4145 case Sema::CXXMoveConstructor: 4146 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 4147 case Sema::CXXMoveAssignment: 4148 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 4149 case Sema::CXXDestructor: 4150 return S.ComputeDefaultedDtorExceptionSpec(MD); 4151 case Sema::CXXInvalid: 4152 break; 4153 } 4154 llvm_unreachable("only special members have implicit exception specs"); 4155} 4156 4157static void 4158updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4159 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4160 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4161 ExceptSpec.getEPI(EPI); 4162 const FunctionProtoType *NewFPT = cast<FunctionProtoType>( 4163 S.Context.getFunctionType(FPT->getResultType(), FPT->arg_type_begin(), 4164 FPT->getNumArgs(), EPI)); 4165 FD->setType(QualType(NewFPT, 0)); 4166} 4167 4168void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4169 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4170 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4171 return; 4172 4173 // Evaluate the exception specification. 4174 ImplicitExceptionSpecification ExceptSpec = 4175 computeImplicitExceptionSpec(*this, Loc, MD); 4176 4177 // Update the type of the special member to use it. 4178 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4179 4180 // A user-provided destructor can be defined outside the class. When that 4181 // happens, be sure to update the exception specification on both 4182 // declarations. 4183 const FunctionProtoType *CanonicalFPT = 4184 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4185 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4186 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4187 CanonicalFPT, ExceptSpec); 4188} 4189 4190void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4191 CXXRecordDecl *RD = MD->getParent(); 4192 CXXSpecialMember CSM = getSpecialMember(MD); 4193 4194 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4195 "not an explicitly-defaulted special member"); 4196 4197 // Whether this was the first-declared instance of the constructor. 4198 // This affects whether we implicitly add an exception spec and constexpr. 4199 bool First = MD == MD->getCanonicalDecl(); 4200 4201 bool HadError = false; 4202 4203 // C++11 [dcl.fct.def.default]p1: 4204 // A function that is explicitly defaulted shall 4205 // -- be a special member function (checked elsewhere), 4206 // -- have the same type (except for ref-qualifiers, and except that a 4207 // copy operation can take a non-const reference) as an implicit 4208 // declaration, and 4209 // -- not have default arguments. 4210 unsigned ExpectedParams = 1; 4211 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4212 ExpectedParams = 0; 4213 if (MD->getNumParams() != ExpectedParams) { 4214 // This also checks for default arguments: a copy or move constructor with a 4215 // default argument is classified as a default constructor, and assignment 4216 // operations and destructors can't have default arguments. 4217 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4218 << CSM << MD->getSourceRange(); 4219 HadError = true; 4220 } else if (MD->isVariadic()) { 4221 Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic) 4222 << CSM << MD->getSourceRange(); 4223 HadError = true; 4224 } 4225 4226 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4227 4228 bool CanHaveConstParam = false; 4229 if (CSM == CXXCopyConstructor) 4230 CanHaveConstParam = RD->implicitCopyConstructorHasConstParam(); 4231 else if (CSM == CXXCopyAssignment) 4232 CanHaveConstParam = RD->implicitCopyAssignmentHasConstParam(); 4233 4234 QualType ReturnType = Context.VoidTy; 4235 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4236 // Check for return type matching. 4237 ReturnType = Type->getResultType(); 4238 QualType ExpectedReturnType = 4239 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4240 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4241 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4242 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4243 HadError = true; 4244 } 4245 4246 // A defaulted special member cannot have cv-qualifiers. 4247 if (Type->getTypeQuals()) { 4248 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4249 << (CSM == CXXMoveAssignment); 4250 HadError = true; 4251 } 4252 } 4253 4254 // Check for parameter type matching. 4255 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4256 bool HasConstParam = false; 4257 if (ExpectedParams && ArgType->isReferenceType()) { 4258 // Argument must be reference to possibly-const T. 4259 QualType ReferentType = ArgType->getPointeeType(); 4260 HasConstParam = ReferentType.isConstQualified(); 4261 4262 if (ReferentType.isVolatileQualified()) { 4263 Diag(MD->getLocation(), 4264 diag::err_defaulted_special_member_volatile_param) << CSM; 4265 HadError = true; 4266 } 4267 4268 if (HasConstParam && !CanHaveConstParam) { 4269 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4270 Diag(MD->getLocation(), 4271 diag::err_defaulted_special_member_copy_const_param) 4272 << (CSM == CXXCopyAssignment); 4273 // FIXME: Explain why this special member can't be const. 4274 } else { 4275 Diag(MD->getLocation(), 4276 diag::err_defaulted_special_member_move_const_param) 4277 << (CSM == CXXMoveAssignment); 4278 } 4279 HadError = true; 4280 } 4281 } else if (ExpectedParams) { 4282 // A copy assignment operator can take its argument by value, but a 4283 // defaulted one cannot. 4284 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4285 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4286 HadError = true; 4287 } 4288 4289 // C++11 [dcl.fct.def.default]p2: 4290 // An explicitly-defaulted function may be declared constexpr only if it 4291 // would have been implicitly declared as constexpr, 4292 // Do not apply this rule to members of class templates, since core issue 1358 4293 // makes such functions always instantiate to constexpr functions. For 4294 // non-constructors, this is checked elsewhere. 4295 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4296 HasConstParam); 4297 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr && 4298 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4299 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4300 // FIXME: Explain why the constructor can't be constexpr. 4301 HadError = true; 4302 } 4303 4304 // and may have an explicit exception-specification only if it is compatible 4305 // with the exception-specification on the implicit declaration. 4306 if (Type->hasExceptionSpec()) { 4307 // Delay the check if this is the first declaration of the special member, 4308 // since we may not have parsed some necessary in-class initializers yet. 4309 if (First) 4310 DelayedDefaultedMemberExceptionSpecs.push_back(std::make_pair(MD, Type)); 4311 else 4312 CheckExplicitlyDefaultedMemberExceptionSpec(MD, Type); 4313 } 4314 4315 // If a function is explicitly defaulted on its first declaration, 4316 if (First) { 4317 // -- it is implicitly considered to be constexpr if the implicit 4318 // definition would be, 4319 MD->setConstexpr(Constexpr); 4320 4321 // -- it is implicitly considered to have the same exception-specification 4322 // as if it had been implicitly declared, 4323 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4324 EPI.ExceptionSpecType = EST_Unevaluated; 4325 EPI.ExceptionSpecDecl = MD; 4326 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 4327 ExpectedParams, EPI)); 4328 } 4329 4330 if (ShouldDeleteSpecialMember(MD, CSM)) { 4331 if (First) { 4332 MD->setDeletedAsWritten(); 4333 } else { 4334 // C++11 [dcl.fct.def.default]p4: 4335 // [For a] user-provided explicitly-defaulted function [...] if such a 4336 // function is implicitly defined as deleted, the program is ill-formed. 4337 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4338 HadError = true; 4339 } 4340 } 4341 4342 if (HadError) 4343 MD->setInvalidDecl(); 4344} 4345 4346/// Check whether the exception specification provided for an 4347/// explicitly-defaulted special member matches the exception specification 4348/// that would have been generated for an implicit special member, per 4349/// C++11 [dcl.fct.def.default]p2. 4350void Sema::CheckExplicitlyDefaultedMemberExceptionSpec( 4351 CXXMethodDecl *MD, const FunctionProtoType *SpecifiedType) { 4352 // Compute the implicit exception specification. 4353 FunctionProtoType::ExtProtoInfo EPI; 4354 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4355 const FunctionProtoType *ImplicitType = cast<FunctionProtoType>( 4356 Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4357 4358 // Ensure that it matches. 4359 CheckEquivalentExceptionSpec( 4360 PDiag(diag::err_incorrect_defaulted_exception_spec) 4361 << getSpecialMember(MD), PDiag(), 4362 ImplicitType, SourceLocation(), 4363 SpecifiedType, MD->getLocation()); 4364} 4365 4366void Sema::CheckDelayedExplicitlyDefaultedMemberExceptionSpecs() { 4367 for (unsigned I = 0, N = DelayedDefaultedMemberExceptionSpecs.size(); 4368 I != N; ++I) 4369 CheckExplicitlyDefaultedMemberExceptionSpec( 4370 DelayedDefaultedMemberExceptionSpecs[I].first, 4371 DelayedDefaultedMemberExceptionSpecs[I].second); 4372 4373 DelayedDefaultedMemberExceptionSpecs.clear(); 4374} 4375 4376namespace { 4377struct SpecialMemberDeletionInfo { 4378 Sema &S; 4379 CXXMethodDecl *MD; 4380 Sema::CXXSpecialMember CSM; 4381 bool Diagnose; 4382 4383 // Properties of the special member, computed for convenience. 4384 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4385 SourceLocation Loc; 4386 4387 bool AllFieldsAreConst; 4388 4389 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4390 Sema::CXXSpecialMember CSM, bool Diagnose) 4391 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4392 IsConstructor(false), IsAssignment(false), IsMove(false), 4393 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4394 AllFieldsAreConst(true) { 4395 switch (CSM) { 4396 case Sema::CXXDefaultConstructor: 4397 case Sema::CXXCopyConstructor: 4398 IsConstructor = true; 4399 break; 4400 case Sema::CXXMoveConstructor: 4401 IsConstructor = true; 4402 IsMove = true; 4403 break; 4404 case Sema::CXXCopyAssignment: 4405 IsAssignment = true; 4406 break; 4407 case Sema::CXXMoveAssignment: 4408 IsAssignment = true; 4409 IsMove = true; 4410 break; 4411 case Sema::CXXDestructor: 4412 break; 4413 case Sema::CXXInvalid: 4414 llvm_unreachable("invalid special member kind"); 4415 } 4416 4417 if (MD->getNumParams()) { 4418 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4419 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4420 } 4421 } 4422 4423 bool inUnion() const { return MD->getParent()->isUnion(); } 4424 4425 /// Look up the corresponding special member in the given class. 4426 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4427 unsigned Quals) { 4428 unsigned TQ = MD->getTypeQualifiers(); 4429 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4430 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4431 Quals = 0; 4432 return S.LookupSpecialMember(Class, CSM, 4433 ConstArg || (Quals & Qualifiers::Const), 4434 VolatileArg || (Quals & Qualifiers::Volatile), 4435 MD->getRefQualifier() == RQ_RValue, 4436 TQ & Qualifiers::Const, 4437 TQ & Qualifiers::Volatile); 4438 } 4439 4440 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4441 4442 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4443 bool shouldDeleteForField(FieldDecl *FD); 4444 bool shouldDeleteForAllConstMembers(); 4445 4446 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4447 unsigned Quals); 4448 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4449 Sema::SpecialMemberOverloadResult *SMOR, 4450 bool IsDtorCallInCtor); 4451 4452 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4453}; 4454} 4455 4456/// Is the given special member inaccessible when used on the given 4457/// sub-object. 4458bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4459 CXXMethodDecl *target) { 4460 /// If we're operating on a base class, the object type is the 4461 /// type of this special member. 4462 QualType objectTy; 4463 AccessSpecifier access = target->getAccess(); 4464 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4465 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4466 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4467 4468 // If we're operating on a field, the object type is the type of the field. 4469 } else { 4470 objectTy = S.Context.getTypeDeclType(target->getParent()); 4471 } 4472 4473 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4474} 4475 4476/// Check whether we should delete a special member due to the implicit 4477/// definition containing a call to a special member of a subobject. 4478bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4479 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4480 bool IsDtorCallInCtor) { 4481 CXXMethodDecl *Decl = SMOR->getMethod(); 4482 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4483 4484 int DiagKind = -1; 4485 4486 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4487 DiagKind = !Decl ? 0 : 1; 4488 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4489 DiagKind = 2; 4490 else if (!isAccessible(Subobj, Decl)) 4491 DiagKind = 3; 4492 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4493 !Decl->isTrivial()) { 4494 // A member of a union must have a trivial corresponding special member. 4495 // As a weird special case, a destructor call from a union's constructor 4496 // must be accessible and non-deleted, but need not be trivial. Such a 4497 // destructor is never actually called, but is semantically checked as 4498 // if it were. 4499 DiagKind = 4; 4500 } 4501 4502 if (DiagKind == -1) 4503 return false; 4504 4505 if (Diagnose) { 4506 if (Field) { 4507 S.Diag(Field->getLocation(), 4508 diag::note_deleted_special_member_class_subobject) 4509 << CSM << MD->getParent() << /*IsField*/true 4510 << Field << DiagKind << IsDtorCallInCtor; 4511 } else { 4512 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4513 S.Diag(Base->getLocStart(), 4514 diag::note_deleted_special_member_class_subobject) 4515 << CSM << MD->getParent() << /*IsField*/false 4516 << Base->getType() << DiagKind << IsDtorCallInCtor; 4517 } 4518 4519 if (DiagKind == 1) 4520 S.NoteDeletedFunction(Decl); 4521 // FIXME: Explain inaccessibility if DiagKind == 3. 4522 } 4523 4524 return true; 4525} 4526 4527/// Check whether we should delete a special member function due to having a 4528/// direct or virtual base class or non-static data member of class type M. 4529bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4530 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 4531 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4532 4533 // C++11 [class.ctor]p5: 4534 // -- any direct or virtual base class, or non-static data member with no 4535 // brace-or-equal-initializer, has class type M (or array thereof) and 4536 // either M has no default constructor or overload resolution as applied 4537 // to M's default constructor results in an ambiguity or in a function 4538 // that is deleted or inaccessible 4539 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4540 // -- a direct or virtual base class B that cannot be copied/moved because 4541 // overload resolution, as applied to B's corresponding special member, 4542 // results in an ambiguity or a function that is deleted or inaccessible 4543 // from the defaulted special member 4544 // C++11 [class.dtor]p5: 4545 // -- any direct or virtual base class [...] has a type with a destructor 4546 // that is deleted or inaccessible 4547 if (!(CSM == Sema::CXXDefaultConstructor && 4548 Field && Field->hasInClassInitializer()) && 4549 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 4550 return true; 4551 4552 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4553 // -- any direct or virtual base class or non-static data member has a 4554 // type with a destructor that is deleted or inaccessible 4555 if (IsConstructor) { 4556 Sema::SpecialMemberOverloadResult *SMOR = 4557 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4558 false, false, false, false, false); 4559 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4560 return true; 4561 } 4562 4563 return false; 4564} 4565 4566/// Check whether we should delete a special member function due to the class 4567/// having a particular direct or virtual base class. 4568bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4569 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4570 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 4571} 4572 4573/// Check whether we should delete a special member function due to the class 4574/// having a particular non-static data member. 4575bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4576 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4577 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4578 4579 if (CSM == Sema::CXXDefaultConstructor) { 4580 // For a default constructor, all references must be initialized in-class 4581 // and, if a union, it must have a non-const member. 4582 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4583 if (Diagnose) 4584 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4585 << MD->getParent() << FD << FieldType << /*Reference*/0; 4586 return true; 4587 } 4588 // C++11 [class.ctor]p5: any non-variant non-static data member of 4589 // const-qualified type (or array thereof) with no 4590 // brace-or-equal-initializer does not have a user-provided default 4591 // constructor. 4592 if (!inUnion() && FieldType.isConstQualified() && 4593 !FD->hasInClassInitializer() && 4594 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4595 if (Diagnose) 4596 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4597 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4598 return true; 4599 } 4600 4601 if (inUnion() && !FieldType.isConstQualified()) 4602 AllFieldsAreConst = false; 4603 } else if (CSM == Sema::CXXCopyConstructor) { 4604 // For a copy constructor, data members must not be of rvalue reference 4605 // type. 4606 if (FieldType->isRValueReferenceType()) { 4607 if (Diagnose) 4608 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4609 << MD->getParent() << FD << FieldType; 4610 return true; 4611 } 4612 } else if (IsAssignment) { 4613 // For an assignment operator, data members must not be of reference type. 4614 if (FieldType->isReferenceType()) { 4615 if (Diagnose) 4616 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4617 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4618 return true; 4619 } 4620 if (!FieldRecord && FieldType.isConstQualified()) { 4621 // C++11 [class.copy]p23: 4622 // -- a non-static data member of const non-class type (or array thereof) 4623 if (Diagnose) 4624 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4625 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4626 return true; 4627 } 4628 } 4629 4630 if (FieldRecord) { 4631 // Some additional restrictions exist on the variant members. 4632 if (!inUnion() && FieldRecord->isUnion() && 4633 FieldRecord->isAnonymousStructOrUnion()) { 4634 bool AllVariantFieldsAreConst = true; 4635 4636 // FIXME: Handle anonymous unions declared within anonymous unions. 4637 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4638 UE = FieldRecord->field_end(); 4639 UI != UE; ++UI) { 4640 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4641 4642 if (!UnionFieldType.isConstQualified()) 4643 AllVariantFieldsAreConst = false; 4644 4645 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4646 if (UnionFieldRecord && 4647 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 4648 UnionFieldType.getCVRQualifiers())) 4649 return true; 4650 } 4651 4652 // At least one member in each anonymous union must be non-const 4653 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4654 FieldRecord->field_begin() != FieldRecord->field_end()) { 4655 if (Diagnose) 4656 S.Diag(FieldRecord->getLocation(), 4657 diag::note_deleted_default_ctor_all_const) 4658 << MD->getParent() << /*anonymous union*/1; 4659 return true; 4660 } 4661 4662 // Don't check the implicit member of the anonymous union type. 4663 // This is technically non-conformant, but sanity demands it. 4664 return false; 4665 } 4666 4667 if (shouldDeleteForClassSubobject(FieldRecord, FD, 4668 FieldType.getCVRQualifiers())) 4669 return true; 4670 } 4671 4672 return false; 4673} 4674 4675/// C++11 [class.ctor] p5: 4676/// A defaulted default constructor for a class X is defined as deleted if 4677/// X is a union and all of its variant members are of const-qualified type. 4678bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4679 // This is a silly definition, because it gives an empty union a deleted 4680 // default constructor. Don't do that. 4681 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4682 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4683 if (Diagnose) 4684 S.Diag(MD->getParent()->getLocation(), 4685 diag::note_deleted_default_ctor_all_const) 4686 << MD->getParent() << /*not anonymous union*/0; 4687 return true; 4688 } 4689 return false; 4690} 4691 4692/// Determine whether a defaulted special member function should be defined as 4693/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4694/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4695bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4696 bool Diagnose) { 4697 if (MD->isInvalidDecl()) 4698 return false; 4699 CXXRecordDecl *RD = MD->getParent(); 4700 assert(!RD->isDependentType() && "do deletion after instantiation"); 4701 if (!LangOpts.CPlusPlus11 || RD->isInvalidDecl()) 4702 return false; 4703 4704 // C++11 [expr.lambda.prim]p19: 4705 // The closure type associated with a lambda-expression has a 4706 // deleted (8.4.3) default constructor and a deleted copy 4707 // assignment operator. 4708 if (RD->isLambda() && 4709 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4710 if (Diagnose) 4711 Diag(RD->getLocation(), diag::note_lambda_decl); 4712 return true; 4713 } 4714 4715 // For an anonymous struct or union, the copy and assignment special members 4716 // will never be used, so skip the check. For an anonymous union declared at 4717 // namespace scope, the constructor and destructor are used. 4718 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4719 RD->isAnonymousStructOrUnion()) 4720 return false; 4721 4722 // C++11 [class.copy]p7, p18: 4723 // If the class definition declares a move constructor or move assignment 4724 // operator, an implicitly declared copy constructor or copy assignment 4725 // operator is defined as deleted. 4726 if (MD->isImplicit() && 4727 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4728 CXXMethodDecl *UserDeclaredMove = 0; 4729 4730 // In Microsoft mode, a user-declared move only causes the deletion of the 4731 // corresponding copy operation, not both copy operations. 4732 if (RD->hasUserDeclaredMoveConstructor() && 4733 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4734 if (!Diagnose) return true; 4735 4736 // Find any user-declared move constructor. 4737 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(), 4738 E = RD->ctor_end(); I != E; ++I) { 4739 if (I->isMoveConstructor()) { 4740 UserDeclaredMove = *I; 4741 break; 4742 } 4743 } 4744 assert(UserDeclaredMove); 4745 } else if (RD->hasUserDeclaredMoveAssignment() && 4746 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4747 if (!Diagnose) return true; 4748 4749 // Find any user-declared move assignment operator. 4750 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 4751 E = RD->method_end(); I != E; ++I) { 4752 if (I->isMoveAssignmentOperator()) { 4753 UserDeclaredMove = *I; 4754 break; 4755 } 4756 } 4757 assert(UserDeclaredMove); 4758 } 4759 4760 if (UserDeclaredMove) { 4761 Diag(UserDeclaredMove->getLocation(), 4762 diag::note_deleted_copy_user_declared_move) 4763 << (CSM == CXXCopyAssignment) << RD 4764 << UserDeclaredMove->isMoveAssignmentOperator(); 4765 return true; 4766 } 4767 } 4768 4769 // Do access control from the special member function 4770 ContextRAII MethodContext(*this, MD); 4771 4772 // C++11 [class.dtor]p5: 4773 // -- for a virtual destructor, lookup of the non-array deallocation function 4774 // results in an ambiguity or in a function that is deleted or inaccessible 4775 if (CSM == CXXDestructor && MD->isVirtual()) { 4776 FunctionDecl *OperatorDelete = 0; 4777 DeclarationName Name = 4778 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4779 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4780 OperatorDelete, false)) { 4781 if (Diagnose) 4782 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4783 return true; 4784 } 4785 } 4786 4787 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4788 4789 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4790 BE = RD->bases_end(); BI != BE; ++BI) 4791 if (!BI->isVirtual() && 4792 SMI.shouldDeleteForBase(BI)) 4793 return true; 4794 4795 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4796 BE = RD->vbases_end(); BI != BE; ++BI) 4797 if (SMI.shouldDeleteForBase(BI)) 4798 return true; 4799 4800 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4801 FE = RD->field_end(); FI != FE; ++FI) 4802 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4803 SMI.shouldDeleteForField(*FI)) 4804 return true; 4805 4806 if (SMI.shouldDeleteForAllConstMembers()) 4807 return true; 4808 4809 return false; 4810} 4811 4812/// Perform lookup for a special member of the specified kind, and determine 4813/// whether it is trivial. If the triviality can be determined without the 4814/// lookup, skip it. This is intended for use when determining whether a 4815/// special member of a containing object is trivial, and thus does not ever 4816/// perform overload resolution for default constructors. 4817/// 4818/// If \p Selected is not \c NULL, \c *Selected will be filled in with the 4819/// member that was most likely to be intended to be trivial, if any. 4820static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD, 4821 Sema::CXXSpecialMember CSM, unsigned Quals, 4822 CXXMethodDecl **Selected) { 4823 if (Selected) 4824 *Selected = 0; 4825 4826 switch (CSM) { 4827 case Sema::CXXInvalid: 4828 llvm_unreachable("not a special member"); 4829 4830 case Sema::CXXDefaultConstructor: 4831 // C++11 [class.ctor]p5: 4832 // A default constructor is trivial if: 4833 // - all the [direct subobjects] have trivial default constructors 4834 // 4835 // Note, no overload resolution is performed in this case. 4836 if (RD->hasTrivialDefaultConstructor()) 4837 return true; 4838 4839 if (Selected) { 4840 // If there's a default constructor which could have been trivial, dig it 4841 // out. Otherwise, if there's any user-provided default constructor, point 4842 // to that as an example of why there's not a trivial one. 4843 CXXConstructorDecl *DefCtor = 0; 4844 if (RD->needsImplicitDefaultConstructor()) 4845 S.DeclareImplicitDefaultConstructor(RD); 4846 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), 4847 CE = RD->ctor_end(); CI != CE; ++CI) { 4848 if (!CI->isDefaultConstructor()) 4849 continue; 4850 DefCtor = *CI; 4851 if (!DefCtor->isUserProvided()) 4852 break; 4853 } 4854 4855 *Selected = DefCtor; 4856 } 4857 4858 return false; 4859 4860 case Sema::CXXDestructor: 4861 // C++11 [class.dtor]p5: 4862 // A destructor is trivial if: 4863 // - all the direct [subobjects] have trivial destructors 4864 if (RD->hasTrivialDestructor()) 4865 return true; 4866 4867 if (Selected) { 4868 if (RD->needsImplicitDestructor()) 4869 S.DeclareImplicitDestructor(RD); 4870 *Selected = RD->getDestructor(); 4871 } 4872 4873 return false; 4874 4875 case Sema::CXXCopyConstructor: 4876 // C++11 [class.copy]p12: 4877 // A copy constructor is trivial if: 4878 // - the constructor selected to copy each direct [subobject] is trivial 4879 if (RD->hasTrivialCopyConstructor()) { 4880 if (Quals == Qualifiers::Const) 4881 // We must either select the trivial copy constructor or reach an 4882 // ambiguity; no need to actually perform overload resolution. 4883 return true; 4884 } else if (!Selected) { 4885 return false; 4886 } 4887 // In C++98, we are not supposed to perform overload resolution here, but we 4888 // treat that as a language defect, as suggested on cxx-abi-dev, to treat 4889 // cases like B as having a non-trivial copy constructor: 4890 // struct A { template<typename T> A(T&); }; 4891 // struct B { mutable A a; }; 4892 goto NeedOverloadResolution; 4893 4894 case Sema::CXXCopyAssignment: 4895 // C++11 [class.copy]p25: 4896 // A copy assignment operator is trivial if: 4897 // - the assignment operator selected to copy each direct [subobject] is 4898 // trivial 4899 if (RD->hasTrivialCopyAssignment()) { 4900 if (Quals == Qualifiers::Const) 4901 return true; 4902 } else if (!Selected) { 4903 return false; 4904 } 4905 // In C++98, we are not supposed to perform overload resolution here, but we 4906 // treat that as a language defect. 4907 goto NeedOverloadResolution; 4908 4909 case Sema::CXXMoveConstructor: 4910 case Sema::CXXMoveAssignment: 4911 NeedOverloadResolution: 4912 Sema::SpecialMemberOverloadResult *SMOR = 4913 S.LookupSpecialMember(RD, CSM, 4914 Quals & Qualifiers::Const, 4915 Quals & Qualifiers::Volatile, 4916 /*RValueThis*/false, /*ConstThis*/false, 4917 /*VolatileThis*/false); 4918 4919 // The standard doesn't describe how to behave if the lookup is ambiguous. 4920 // We treat it as not making the member non-trivial, just like the standard 4921 // mandates for the default constructor. This should rarely matter, because 4922 // the member will also be deleted. 4923 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4924 return true; 4925 4926 if (!SMOR->getMethod()) { 4927 assert(SMOR->getKind() == 4928 Sema::SpecialMemberOverloadResult::NoMemberOrDeleted); 4929 return false; 4930 } 4931 4932 // We deliberately don't check if we found a deleted special member. We're 4933 // not supposed to! 4934 if (Selected) 4935 *Selected = SMOR->getMethod(); 4936 return SMOR->getMethod()->isTrivial(); 4937 } 4938 4939 llvm_unreachable("unknown special method kind"); 4940} 4941 4942CXXConstructorDecl *findUserDeclaredCtor(CXXRecordDecl *RD) { 4943 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), CE = RD->ctor_end(); 4944 CI != CE; ++CI) 4945 if (!CI->isImplicit()) 4946 return *CI; 4947 4948 // Look for constructor templates. 4949 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> tmpl_iter; 4950 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); TI != TE; ++TI) { 4951 if (CXXConstructorDecl *CD = 4952 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl())) 4953 return CD; 4954 } 4955 4956 return 0; 4957} 4958 4959/// The kind of subobject we are checking for triviality. The values of this 4960/// enumeration are used in diagnostics. 4961enum TrivialSubobjectKind { 4962 /// The subobject is a base class. 4963 TSK_BaseClass, 4964 /// The subobject is a non-static data member. 4965 TSK_Field, 4966 /// The object is actually the complete object. 4967 TSK_CompleteObject 4968}; 4969 4970/// Check whether the special member selected for a given type would be trivial. 4971static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc, 4972 QualType SubType, 4973 Sema::CXXSpecialMember CSM, 4974 TrivialSubobjectKind Kind, 4975 bool Diagnose) { 4976 CXXRecordDecl *SubRD = SubType->getAsCXXRecordDecl(); 4977 if (!SubRD) 4978 return true; 4979 4980 CXXMethodDecl *Selected; 4981 if (findTrivialSpecialMember(S, SubRD, CSM, SubType.getCVRQualifiers(), 4982 Diagnose ? &Selected : 0)) 4983 return true; 4984 4985 if (Diagnose) { 4986 if (!Selected && CSM == Sema::CXXDefaultConstructor) { 4987 S.Diag(SubobjLoc, diag::note_nontrivial_no_def_ctor) 4988 << Kind << SubType.getUnqualifiedType(); 4989 if (CXXConstructorDecl *CD = findUserDeclaredCtor(SubRD)) 4990 S.Diag(CD->getLocation(), diag::note_user_declared_ctor); 4991 } else if (!Selected) 4992 S.Diag(SubobjLoc, diag::note_nontrivial_no_copy) 4993 << Kind << SubType.getUnqualifiedType() << CSM << SubType; 4994 else if (Selected->isUserProvided()) { 4995 if (Kind == TSK_CompleteObject) 4996 S.Diag(Selected->getLocation(), diag::note_nontrivial_user_provided) 4997 << Kind << SubType.getUnqualifiedType() << CSM; 4998 else { 4999 S.Diag(SubobjLoc, diag::note_nontrivial_user_provided) 5000 << Kind << SubType.getUnqualifiedType() << CSM; 5001 S.Diag(Selected->getLocation(), diag::note_declared_at); 5002 } 5003 } else { 5004 if (Kind != TSK_CompleteObject) 5005 S.Diag(SubobjLoc, diag::note_nontrivial_subobject) 5006 << Kind << SubType.getUnqualifiedType() << CSM; 5007 5008 // Explain why the defaulted or deleted special member isn't trivial. 5009 S.SpecialMemberIsTrivial(Selected, CSM, Diagnose); 5010 } 5011 } 5012 5013 return false; 5014} 5015 5016/// Check whether the members of a class type allow a special member to be 5017/// trivial. 5018static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD, 5019 Sema::CXXSpecialMember CSM, 5020 bool ConstArg, bool Diagnose) { 5021 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 5022 FE = RD->field_end(); FI != FE; ++FI) { 5023 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 5024 continue; 5025 5026 QualType FieldType = S.Context.getBaseElementType(FI->getType()); 5027 5028 // Pretend anonymous struct or union members are members of this class. 5029 if (FI->isAnonymousStructOrUnion()) { 5030 if (!checkTrivialClassMembers(S, FieldType->getAsCXXRecordDecl(), 5031 CSM, ConstArg, Diagnose)) 5032 return false; 5033 continue; 5034 } 5035 5036 // C++11 [class.ctor]p5: 5037 // A default constructor is trivial if [...] 5038 // -- no non-static data member of its class has a 5039 // brace-or-equal-initializer 5040 if (CSM == Sema::CXXDefaultConstructor && FI->hasInClassInitializer()) { 5041 if (Diagnose) 5042 S.Diag(FI->getLocation(), diag::note_nontrivial_in_class_init) << *FI; 5043 return false; 5044 } 5045 5046 // Objective C ARC 4.3.5: 5047 // [...] nontrivally ownership-qualified types are [...] not trivially 5048 // default constructible, copy constructible, move constructible, copy 5049 // assignable, move assignable, or destructible [...] 5050 if (S.getLangOpts().ObjCAutoRefCount && 5051 FieldType.hasNonTrivialObjCLifetime()) { 5052 if (Diagnose) 5053 S.Diag(FI->getLocation(), diag::note_nontrivial_objc_ownership) 5054 << RD << FieldType.getObjCLifetime(); 5055 return false; 5056 } 5057 5058 if (ConstArg && !FI->isMutable()) 5059 FieldType.addConst(); 5060 if (!checkTrivialSubobjectCall(S, FI->getLocation(), FieldType, CSM, 5061 TSK_Field, Diagnose)) 5062 return false; 5063 } 5064 5065 return true; 5066} 5067 5068/// Diagnose why the specified class does not have a trivial special member of 5069/// the given kind. 5070void Sema::DiagnoseNontrivial(const CXXRecordDecl *RD, CXXSpecialMember CSM) { 5071 QualType Ty = Context.getRecordType(RD); 5072 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) 5073 Ty.addConst(); 5074 5075 checkTrivialSubobjectCall(*this, RD->getLocation(), Ty, CSM, 5076 TSK_CompleteObject, /*Diagnose*/true); 5077} 5078 5079/// Determine whether a defaulted or deleted special member function is trivial, 5080/// as specified in C++11 [class.ctor]p5, C++11 [class.copy]p12, 5081/// C++11 [class.copy]p25, and C++11 [class.dtor]p5. 5082bool Sema::SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM, 5083 bool Diagnose) { 5084 assert(!MD->isUserProvided() && CSM != CXXInvalid && "not special enough"); 5085 5086 CXXRecordDecl *RD = MD->getParent(); 5087 5088 bool ConstArg = false; 5089 ParmVarDecl *Param0 = MD->getNumParams() ? MD->getParamDecl(0) : 0; 5090 5091 // C++11 [class.copy]p12, p25: 5092 // A [special member] is trivial if its declared parameter type is the same 5093 // as if it had been implicitly declared [...] 5094 switch (CSM) { 5095 case CXXDefaultConstructor: 5096 case CXXDestructor: 5097 // Trivial default constructors and destructors cannot have parameters. 5098 break; 5099 5100 case CXXCopyConstructor: 5101 case CXXCopyAssignment: { 5102 // Trivial copy operations always have const, non-volatile parameter types. 5103 ConstArg = true; 5104 const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>(); 5105 if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) { 5106 if (Diagnose) 5107 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5108 << Param0->getSourceRange() << Param0->getType() 5109 << Context.getLValueReferenceType( 5110 Context.getRecordType(RD).withConst()); 5111 return false; 5112 } 5113 break; 5114 } 5115 5116 case CXXMoveConstructor: 5117 case CXXMoveAssignment: { 5118 // Trivial move operations always have non-cv-qualified parameters. 5119 const RValueReferenceType *RT = 5120 Param0->getType()->getAs<RValueReferenceType>(); 5121 if (!RT || RT->getPointeeType().getCVRQualifiers()) { 5122 if (Diagnose) 5123 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5124 << Param0->getSourceRange() << Param0->getType() 5125 << Context.getRValueReferenceType(Context.getRecordType(RD)); 5126 return false; 5127 } 5128 break; 5129 } 5130 5131 case CXXInvalid: 5132 llvm_unreachable("not a special member"); 5133 } 5134 5135 // FIXME: We require that the parameter-declaration-clause is equivalent to 5136 // that of an implicit declaration, not just that the declared parameter type 5137 // matches, in order to prevent absuridities like a function simultaneously 5138 // being a trivial copy constructor and a non-trivial default constructor. 5139 // This issue has not yet been assigned a core issue number. 5140 if (MD->getMinRequiredArguments() < MD->getNumParams()) { 5141 if (Diagnose) 5142 Diag(MD->getParamDecl(MD->getMinRequiredArguments())->getLocation(), 5143 diag::note_nontrivial_default_arg) 5144 << MD->getParamDecl(MD->getMinRequiredArguments())->getSourceRange(); 5145 return false; 5146 } 5147 if (MD->isVariadic()) { 5148 if (Diagnose) 5149 Diag(MD->getLocation(), diag::note_nontrivial_variadic); 5150 return false; 5151 } 5152 5153 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5154 // A copy/move [constructor or assignment operator] is trivial if 5155 // -- the [member] selected to copy/move each direct base class subobject 5156 // is trivial 5157 // 5158 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5159 // A [default constructor or destructor] is trivial if 5160 // -- all the direct base classes have trivial [default constructors or 5161 // destructors] 5162 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 5163 BE = RD->bases_end(); BI != BE; ++BI) 5164 if (!checkTrivialSubobjectCall(*this, BI->getLocStart(), 5165 ConstArg ? BI->getType().withConst() 5166 : BI->getType(), 5167 CSM, TSK_BaseClass, Diagnose)) 5168 return false; 5169 5170 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5171 // A copy/move [constructor or assignment operator] for a class X is 5172 // trivial if 5173 // -- for each non-static data member of X that is of class type (or array 5174 // thereof), the constructor selected to copy/move that member is 5175 // trivial 5176 // 5177 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5178 // A [default constructor or destructor] is trivial if 5179 // -- for all of the non-static data members of its class that are of class 5180 // type (or array thereof), each such class has a trivial [default 5181 // constructor or destructor] 5182 if (!checkTrivialClassMembers(*this, RD, CSM, ConstArg, Diagnose)) 5183 return false; 5184 5185 // C++11 [class.dtor]p5: 5186 // A destructor is trivial if [...] 5187 // -- the destructor is not virtual 5188 if (CSM == CXXDestructor && MD->isVirtual()) { 5189 if (Diagnose) 5190 Diag(MD->getLocation(), diag::note_nontrivial_virtual_dtor) << RD; 5191 return false; 5192 } 5193 5194 // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25: 5195 // A [special member] for class X is trivial if [...] 5196 // -- class X has no virtual functions and no virtual base classes 5197 if (CSM != CXXDestructor && MD->getParent()->isDynamicClass()) { 5198 if (!Diagnose) 5199 return false; 5200 5201 if (RD->getNumVBases()) { 5202 // Check for virtual bases. We already know that the corresponding 5203 // member in all bases is trivial, so vbases must all be direct. 5204 CXXBaseSpecifier &BS = *RD->vbases_begin(); 5205 assert(BS.isVirtual()); 5206 Diag(BS.getLocStart(), diag::note_nontrivial_has_virtual) << RD << 1; 5207 return false; 5208 } 5209 5210 // Must have a virtual method. 5211 for (CXXRecordDecl::method_iterator MI = RD->method_begin(), 5212 ME = RD->method_end(); MI != ME; ++MI) { 5213 if (MI->isVirtual()) { 5214 SourceLocation MLoc = MI->getLocStart(); 5215 Diag(MLoc, diag::note_nontrivial_has_virtual) << RD << 0; 5216 return false; 5217 } 5218 } 5219 5220 llvm_unreachable("dynamic class with no vbases and no virtual functions"); 5221 } 5222 5223 // Looks like it's trivial! 5224 return true; 5225} 5226 5227/// \brief Data used with FindHiddenVirtualMethod 5228namespace { 5229 struct FindHiddenVirtualMethodData { 5230 Sema *S; 5231 CXXMethodDecl *Method; 5232 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 5233 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 5234 }; 5235} 5236 5237/// \brief Check whether any most overriden method from MD in Methods 5238static bool CheckMostOverridenMethods(const CXXMethodDecl *MD, 5239 const llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5240 if (MD->size_overridden_methods() == 0) 5241 return Methods.count(MD->getCanonicalDecl()); 5242 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5243 E = MD->end_overridden_methods(); 5244 I != E; ++I) 5245 if (CheckMostOverridenMethods(*I, Methods)) 5246 return true; 5247 return false; 5248} 5249 5250/// \brief Member lookup function that determines whether a given C++ 5251/// method overloads virtual methods in a base class without overriding any, 5252/// to be used with CXXRecordDecl::lookupInBases(). 5253static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 5254 CXXBasePath &Path, 5255 void *UserData) { 5256 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 5257 5258 FindHiddenVirtualMethodData &Data 5259 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 5260 5261 DeclarationName Name = Data.Method->getDeclName(); 5262 assert(Name.getNameKind() == DeclarationName::Identifier); 5263 5264 bool foundSameNameMethod = false; 5265 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 5266 for (Path.Decls = BaseRecord->lookup(Name); 5267 !Path.Decls.empty(); 5268 Path.Decls = Path.Decls.slice(1)) { 5269 NamedDecl *D = Path.Decls.front(); 5270 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 5271 MD = MD->getCanonicalDecl(); 5272 foundSameNameMethod = true; 5273 // Interested only in hidden virtual methods. 5274 if (!MD->isVirtual()) 5275 continue; 5276 // If the method we are checking overrides a method from its base 5277 // don't warn about the other overloaded methods. 5278 if (!Data.S->IsOverload(Data.Method, MD, false)) 5279 return true; 5280 // Collect the overload only if its hidden. 5281 if (!CheckMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods)) 5282 overloadedMethods.push_back(MD); 5283 } 5284 } 5285 5286 if (foundSameNameMethod) 5287 Data.OverloadedMethods.append(overloadedMethods.begin(), 5288 overloadedMethods.end()); 5289 return foundSameNameMethod; 5290} 5291 5292/// \brief Add the most overriden methods from MD to Methods 5293static void AddMostOverridenMethods(const CXXMethodDecl *MD, 5294 llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5295 if (MD->size_overridden_methods() == 0) 5296 Methods.insert(MD->getCanonicalDecl()); 5297 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5298 E = MD->end_overridden_methods(); 5299 I != E; ++I) 5300 AddMostOverridenMethods(*I, Methods); 5301} 5302 5303/// \brief See if a method overloads virtual methods in a base class without 5304/// overriding any. 5305void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 5306 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 5307 MD->getLocation()) == DiagnosticsEngine::Ignored) 5308 return; 5309 if (!MD->getDeclName().isIdentifier()) 5310 return; 5311 5312 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 5313 /*bool RecordPaths=*/false, 5314 /*bool DetectVirtual=*/false); 5315 FindHiddenVirtualMethodData Data; 5316 Data.Method = MD; 5317 Data.S = this; 5318 5319 // Keep the base methods that were overriden or introduced in the subclass 5320 // by 'using' in a set. A base method not in this set is hidden. 5321 DeclContext::lookup_result R = DC->lookup(MD->getDeclName()); 5322 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) { 5323 NamedDecl *ND = *I; 5324 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*I)) 5325 ND = shad->getTargetDecl(); 5326 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND)) 5327 AddMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods); 5328 } 5329 5330 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 5331 !Data.OverloadedMethods.empty()) { 5332 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 5333 << MD << (Data.OverloadedMethods.size() > 1); 5334 5335 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 5336 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 5337 Diag(overloadedMD->getLocation(), 5338 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 5339 } 5340 } 5341} 5342 5343void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 5344 Decl *TagDecl, 5345 SourceLocation LBrac, 5346 SourceLocation RBrac, 5347 AttributeList *AttrList) { 5348 if (!TagDecl) 5349 return; 5350 5351 AdjustDeclIfTemplate(TagDecl); 5352 5353 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 5354 if (l->getKind() != AttributeList::AT_Visibility) 5355 continue; 5356 l->setInvalid(); 5357 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 5358 l->getName(); 5359 } 5360 5361 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 5362 // strict aliasing violation! 5363 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 5364 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 5365 5366 CheckCompletedCXXClass( 5367 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 5368} 5369 5370/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 5371/// special functions, such as the default constructor, copy 5372/// constructor, or destructor, to the given C++ class (C++ 5373/// [special]p1). This routine can only be executed just before the 5374/// definition of the class is complete. 5375void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 5376 if (!ClassDecl->hasUserDeclaredConstructor()) 5377 ++ASTContext::NumImplicitDefaultConstructors; 5378 5379 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 5380 ++ASTContext::NumImplicitCopyConstructors; 5381 5382 // If the properties or semantics of the copy constructor couldn't be 5383 // determined while the class was being declared, force a declaration 5384 // of it now. 5385 if (ClassDecl->needsOverloadResolutionForCopyConstructor()) 5386 DeclareImplicitCopyConstructor(ClassDecl); 5387 } 5388 5389 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveConstructor()) { 5390 ++ASTContext::NumImplicitMoveConstructors; 5391 5392 if (ClassDecl->needsOverloadResolutionForMoveConstructor()) 5393 DeclareImplicitMoveConstructor(ClassDecl); 5394 } 5395 5396 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 5397 ++ASTContext::NumImplicitCopyAssignmentOperators; 5398 5399 // If we have a dynamic class, then the copy assignment operator may be 5400 // virtual, so we have to declare it immediately. This ensures that, e.g., 5401 // it shows up in the right place in the vtable and that we diagnose 5402 // problems with the implicit exception specification. 5403 if (ClassDecl->isDynamicClass() || 5404 ClassDecl->needsOverloadResolutionForCopyAssignment()) 5405 DeclareImplicitCopyAssignment(ClassDecl); 5406 } 5407 5408 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveAssignment()) { 5409 ++ASTContext::NumImplicitMoveAssignmentOperators; 5410 5411 // Likewise for the move assignment operator. 5412 if (ClassDecl->isDynamicClass() || 5413 ClassDecl->needsOverloadResolutionForMoveAssignment()) 5414 DeclareImplicitMoveAssignment(ClassDecl); 5415 } 5416 5417 if (!ClassDecl->hasUserDeclaredDestructor()) { 5418 ++ASTContext::NumImplicitDestructors; 5419 5420 // If we have a dynamic class, then the destructor may be virtual, so we 5421 // have to declare the destructor immediately. This ensures that, e.g., it 5422 // shows up in the right place in the vtable and that we diagnose problems 5423 // with the implicit exception specification. 5424 if (ClassDecl->isDynamicClass() || 5425 ClassDecl->needsOverloadResolutionForDestructor()) 5426 DeclareImplicitDestructor(ClassDecl); 5427 } 5428} 5429 5430void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 5431 if (!D) 5432 return; 5433 5434 int NumParamList = D->getNumTemplateParameterLists(); 5435 for (int i = 0; i < NumParamList; i++) { 5436 TemplateParameterList* Params = D->getTemplateParameterList(i); 5437 for (TemplateParameterList::iterator Param = Params->begin(), 5438 ParamEnd = Params->end(); 5439 Param != ParamEnd; ++Param) { 5440 NamedDecl *Named = cast<NamedDecl>(*Param); 5441 if (Named->getDeclName()) { 5442 S->AddDecl(Named); 5443 IdResolver.AddDecl(Named); 5444 } 5445 } 5446 } 5447} 5448 5449void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5450 if (!D) 5451 return; 5452 5453 TemplateParameterList *Params = 0; 5454 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5455 Params = Template->getTemplateParameters(); 5456 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5457 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5458 Params = PartialSpec->getTemplateParameters(); 5459 else 5460 return; 5461 5462 for (TemplateParameterList::iterator Param = Params->begin(), 5463 ParamEnd = Params->end(); 5464 Param != ParamEnd; ++Param) { 5465 NamedDecl *Named = cast<NamedDecl>(*Param); 5466 if (Named->getDeclName()) { 5467 S->AddDecl(Named); 5468 IdResolver.AddDecl(Named); 5469 } 5470 } 5471} 5472 5473void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5474 if (!RecordD) return; 5475 AdjustDeclIfTemplate(RecordD); 5476 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5477 PushDeclContext(S, Record); 5478} 5479 5480void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5481 if (!RecordD) return; 5482 PopDeclContext(); 5483} 5484 5485/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5486/// parsing a top-level (non-nested) C++ class, and we are now 5487/// parsing those parts of the given Method declaration that could 5488/// not be parsed earlier (C++ [class.mem]p2), such as default 5489/// arguments. This action should enter the scope of the given 5490/// Method declaration as if we had just parsed the qualified method 5491/// name. However, it should not bring the parameters into scope; 5492/// that will be performed by ActOnDelayedCXXMethodParameter. 5493void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5494} 5495 5496/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5497/// C++ method declaration. We're (re-)introducing the given 5498/// function parameter into scope for use in parsing later parts of 5499/// the method declaration. For example, we could see an 5500/// ActOnParamDefaultArgument event for this parameter. 5501void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5502 if (!ParamD) 5503 return; 5504 5505 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5506 5507 // If this parameter has an unparsed default argument, clear it out 5508 // to make way for the parsed default argument. 5509 if (Param->hasUnparsedDefaultArg()) 5510 Param->setDefaultArg(0); 5511 5512 S->AddDecl(Param); 5513 if (Param->getDeclName()) 5514 IdResolver.AddDecl(Param); 5515} 5516 5517/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5518/// processing the delayed method declaration for Method. The method 5519/// declaration is now considered finished. There may be a separate 5520/// ActOnStartOfFunctionDef action later (not necessarily 5521/// immediately!) for this method, if it was also defined inside the 5522/// class body. 5523void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5524 if (!MethodD) 5525 return; 5526 5527 AdjustDeclIfTemplate(MethodD); 5528 5529 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5530 5531 // Now that we have our default arguments, check the constructor 5532 // again. It could produce additional diagnostics or affect whether 5533 // the class has implicitly-declared destructors, among other 5534 // things. 5535 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5536 CheckConstructor(Constructor); 5537 5538 // Check the default arguments, which we may have added. 5539 if (!Method->isInvalidDecl()) 5540 CheckCXXDefaultArguments(Method); 5541} 5542 5543/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5544/// the well-formedness of the constructor declarator @p D with type @p 5545/// R. If there are any errors in the declarator, this routine will 5546/// emit diagnostics and set the invalid bit to true. In any case, the type 5547/// will be updated to reflect a well-formed type for the constructor and 5548/// returned. 5549QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5550 StorageClass &SC) { 5551 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5552 5553 // C++ [class.ctor]p3: 5554 // A constructor shall not be virtual (10.3) or static (9.4). A 5555 // constructor can be invoked for a const, volatile or const 5556 // volatile object. A constructor shall not be declared const, 5557 // volatile, or const volatile (9.3.2). 5558 if (isVirtual) { 5559 if (!D.isInvalidType()) 5560 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5561 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5562 << SourceRange(D.getIdentifierLoc()); 5563 D.setInvalidType(); 5564 } 5565 if (SC == SC_Static) { 5566 if (!D.isInvalidType()) 5567 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5568 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5569 << SourceRange(D.getIdentifierLoc()); 5570 D.setInvalidType(); 5571 SC = SC_None; 5572 } 5573 5574 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5575 if (FTI.TypeQuals != 0) { 5576 if (FTI.TypeQuals & Qualifiers::Const) 5577 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5578 << "const" << SourceRange(D.getIdentifierLoc()); 5579 if (FTI.TypeQuals & Qualifiers::Volatile) 5580 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5581 << "volatile" << SourceRange(D.getIdentifierLoc()); 5582 if (FTI.TypeQuals & Qualifiers::Restrict) 5583 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5584 << "restrict" << SourceRange(D.getIdentifierLoc()); 5585 D.setInvalidType(); 5586 } 5587 5588 // C++0x [class.ctor]p4: 5589 // A constructor shall not be declared with a ref-qualifier. 5590 if (FTI.hasRefQualifier()) { 5591 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5592 << FTI.RefQualifierIsLValueRef 5593 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5594 D.setInvalidType(); 5595 } 5596 5597 // Rebuild the function type "R" without any type qualifiers (in 5598 // case any of the errors above fired) and with "void" as the 5599 // return type, since constructors don't have return types. 5600 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5601 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5602 return R; 5603 5604 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5605 EPI.TypeQuals = 0; 5606 EPI.RefQualifier = RQ_None; 5607 5608 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5609 Proto->getNumArgs(), EPI); 5610} 5611 5612/// CheckConstructor - Checks a fully-formed constructor for 5613/// well-formedness, issuing any diagnostics required. Returns true if 5614/// the constructor declarator is invalid. 5615void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5616 CXXRecordDecl *ClassDecl 5617 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5618 if (!ClassDecl) 5619 return Constructor->setInvalidDecl(); 5620 5621 // C++ [class.copy]p3: 5622 // A declaration of a constructor for a class X is ill-formed if 5623 // its first parameter is of type (optionally cv-qualified) X and 5624 // either there are no other parameters or else all other 5625 // parameters have default arguments. 5626 if (!Constructor->isInvalidDecl() && 5627 ((Constructor->getNumParams() == 1) || 5628 (Constructor->getNumParams() > 1 && 5629 Constructor->getParamDecl(1)->hasDefaultArg())) && 5630 Constructor->getTemplateSpecializationKind() 5631 != TSK_ImplicitInstantiation) { 5632 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5633 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5634 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5635 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5636 const char *ConstRef 5637 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5638 : " const &"; 5639 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5640 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5641 5642 // FIXME: Rather that making the constructor invalid, we should endeavor 5643 // to fix the type. 5644 Constructor->setInvalidDecl(); 5645 } 5646 } 5647} 5648 5649/// CheckDestructor - Checks a fully-formed destructor definition for 5650/// well-formedness, issuing any diagnostics required. Returns true 5651/// on error. 5652bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5653 CXXRecordDecl *RD = Destructor->getParent(); 5654 5655 if (Destructor->isVirtual()) { 5656 SourceLocation Loc; 5657 5658 if (!Destructor->isImplicit()) 5659 Loc = Destructor->getLocation(); 5660 else 5661 Loc = RD->getLocation(); 5662 5663 // If we have a virtual destructor, look up the deallocation function 5664 FunctionDecl *OperatorDelete = 0; 5665 DeclarationName Name = 5666 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5667 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5668 return true; 5669 5670 MarkFunctionReferenced(Loc, OperatorDelete); 5671 5672 Destructor->setOperatorDelete(OperatorDelete); 5673 } 5674 5675 return false; 5676} 5677 5678static inline bool 5679FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5680 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5681 FTI.ArgInfo[0].Param && 5682 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5683} 5684 5685/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5686/// the well-formednes of the destructor declarator @p D with type @p 5687/// R. If there are any errors in the declarator, this routine will 5688/// emit diagnostics and set the declarator to invalid. Even if this happens, 5689/// will be updated to reflect a well-formed type for the destructor and 5690/// returned. 5691QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5692 StorageClass& SC) { 5693 // C++ [class.dtor]p1: 5694 // [...] A typedef-name that names a class is a class-name 5695 // (7.1.3); however, a typedef-name that names a class shall not 5696 // be used as the identifier in the declarator for a destructor 5697 // declaration. 5698 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5699 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5700 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5701 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5702 else if (const TemplateSpecializationType *TST = 5703 DeclaratorType->getAs<TemplateSpecializationType>()) 5704 if (TST->isTypeAlias()) 5705 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5706 << DeclaratorType << 1; 5707 5708 // C++ [class.dtor]p2: 5709 // A destructor is used to destroy objects of its class type. A 5710 // destructor takes no parameters, and no return type can be 5711 // specified for it (not even void). The address of a destructor 5712 // shall not be taken. A destructor shall not be static. A 5713 // destructor can be invoked for a const, volatile or const 5714 // volatile object. A destructor shall not be declared const, 5715 // volatile or const volatile (9.3.2). 5716 if (SC == SC_Static) { 5717 if (!D.isInvalidType()) 5718 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5719 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5720 << SourceRange(D.getIdentifierLoc()) 5721 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5722 5723 SC = SC_None; 5724 } 5725 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5726 // Destructors don't have return types, but the parser will 5727 // happily parse something like: 5728 // 5729 // class X { 5730 // float ~X(); 5731 // }; 5732 // 5733 // The return type will be eliminated later. 5734 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5735 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5736 << SourceRange(D.getIdentifierLoc()); 5737 } 5738 5739 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5740 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5741 if (FTI.TypeQuals & Qualifiers::Const) 5742 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5743 << "const" << SourceRange(D.getIdentifierLoc()); 5744 if (FTI.TypeQuals & Qualifiers::Volatile) 5745 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5746 << "volatile" << SourceRange(D.getIdentifierLoc()); 5747 if (FTI.TypeQuals & Qualifiers::Restrict) 5748 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5749 << "restrict" << SourceRange(D.getIdentifierLoc()); 5750 D.setInvalidType(); 5751 } 5752 5753 // C++0x [class.dtor]p2: 5754 // A destructor shall not be declared with a ref-qualifier. 5755 if (FTI.hasRefQualifier()) { 5756 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5757 << FTI.RefQualifierIsLValueRef 5758 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5759 D.setInvalidType(); 5760 } 5761 5762 // Make sure we don't have any parameters. 5763 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5764 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5765 5766 // Delete the parameters. 5767 FTI.freeArgs(); 5768 D.setInvalidType(); 5769 } 5770 5771 // Make sure the destructor isn't variadic. 5772 if (FTI.isVariadic) { 5773 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5774 D.setInvalidType(); 5775 } 5776 5777 // Rebuild the function type "R" without any type qualifiers or 5778 // parameters (in case any of the errors above fired) and with 5779 // "void" as the return type, since destructors don't have return 5780 // types. 5781 if (!D.isInvalidType()) 5782 return R; 5783 5784 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5785 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5786 EPI.Variadic = false; 5787 EPI.TypeQuals = 0; 5788 EPI.RefQualifier = RQ_None; 5789 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5790} 5791 5792/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5793/// well-formednes of the conversion function declarator @p D with 5794/// type @p R. If there are any errors in the declarator, this routine 5795/// will emit diagnostics and return true. Otherwise, it will return 5796/// false. Either way, the type @p R will be updated to reflect a 5797/// well-formed type for the conversion operator. 5798void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5799 StorageClass& SC) { 5800 // C++ [class.conv.fct]p1: 5801 // Neither parameter types nor return type can be specified. The 5802 // type of a conversion function (8.3.5) is "function taking no 5803 // parameter returning conversion-type-id." 5804 if (SC == SC_Static) { 5805 if (!D.isInvalidType()) 5806 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5807 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5808 << SourceRange(D.getIdentifierLoc()); 5809 D.setInvalidType(); 5810 SC = SC_None; 5811 } 5812 5813 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5814 5815 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5816 // Conversion functions don't have return types, but the parser will 5817 // happily parse something like: 5818 // 5819 // class X { 5820 // float operator bool(); 5821 // }; 5822 // 5823 // The return type will be changed later anyway. 5824 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5825 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5826 << SourceRange(D.getIdentifierLoc()); 5827 D.setInvalidType(); 5828 } 5829 5830 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5831 5832 // Make sure we don't have any parameters. 5833 if (Proto->getNumArgs() > 0) { 5834 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5835 5836 // Delete the parameters. 5837 D.getFunctionTypeInfo().freeArgs(); 5838 D.setInvalidType(); 5839 } else if (Proto->isVariadic()) { 5840 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5841 D.setInvalidType(); 5842 } 5843 5844 // Diagnose "&operator bool()" and other such nonsense. This 5845 // is actually a gcc extension which we don't support. 5846 if (Proto->getResultType() != ConvType) { 5847 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5848 << Proto->getResultType(); 5849 D.setInvalidType(); 5850 ConvType = Proto->getResultType(); 5851 } 5852 5853 // C++ [class.conv.fct]p4: 5854 // The conversion-type-id shall not represent a function type nor 5855 // an array type. 5856 if (ConvType->isArrayType()) { 5857 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5858 ConvType = Context.getPointerType(ConvType); 5859 D.setInvalidType(); 5860 } else if (ConvType->isFunctionType()) { 5861 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5862 ConvType = Context.getPointerType(ConvType); 5863 D.setInvalidType(); 5864 } 5865 5866 // Rebuild the function type "R" without any parameters (in case any 5867 // of the errors above fired) and with the conversion type as the 5868 // return type. 5869 if (D.isInvalidType()) 5870 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5871 5872 // C++0x explicit conversion operators. 5873 if (D.getDeclSpec().isExplicitSpecified()) 5874 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5875 getLangOpts().CPlusPlus11 ? 5876 diag::warn_cxx98_compat_explicit_conversion_functions : 5877 diag::ext_explicit_conversion_functions) 5878 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5879} 5880 5881/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5882/// the declaration of the given C++ conversion function. This routine 5883/// is responsible for recording the conversion function in the C++ 5884/// class, if possible. 5885Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5886 assert(Conversion && "Expected to receive a conversion function declaration"); 5887 5888 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5889 5890 // Make sure we aren't redeclaring the conversion function. 5891 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5892 5893 // C++ [class.conv.fct]p1: 5894 // [...] A conversion function is never used to convert a 5895 // (possibly cv-qualified) object to the (possibly cv-qualified) 5896 // same object type (or a reference to it), to a (possibly 5897 // cv-qualified) base class of that type (or a reference to it), 5898 // or to (possibly cv-qualified) void. 5899 // FIXME: Suppress this warning if the conversion function ends up being a 5900 // virtual function that overrides a virtual function in a base class. 5901 QualType ClassType 5902 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5903 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5904 ConvType = ConvTypeRef->getPointeeType(); 5905 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5906 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5907 /* Suppress diagnostics for instantiations. */; 5908 else if (ConvType->isRecordType()) { 5909 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5910 if (ConvType == ClassType) 5911 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5912 << ClassType; 5913 else if (IsDerivedFrom(ClassType, ConvType)) 5914 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5915 << ClassType << ConvType; 5916 } else if (ConvType->isVoidType()) { 5917 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5918 << ClassType << ConvType; 5919 } 5920 5921 if (FunctionTemplateDecl *ConversionTemplate 5922 = Conversion->getDescribedFunctionTemplate()) 5923 return ConversionTemplate; 5924 5925 return Conversion; 5926} 5927 5928//===----------------------------------------------------------------------===// 5929// Namespace Handling 5930//===----------------------------------------------------------------------===// 5931 5932/// \brief Diagnose a mismatch in 'inline' qualifiers when a namespace is 5933/// reopened. 5934static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc, 5935 SourceLocation Loc, 5936 IdentifierInfo *II, bool *IsInline, 5937 NamespaceDecl *PrevNS) { 5938 assert(*IsInline != PrevNS->isInline()); 5939 5940 // HACK: Work around a bug in libstdc++4.6's <atomic>, where 5941 // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as 5942 // inline namespaces, with the intention of bringing names into namespace std. 5943 // 5944 // We support this just well enough to get that case working; this is not 5945 // sufficient to support reopening namespaces as inline in general. 5946 if (*IsInline && II && II->getName().startswith("__atomic") && 5947 S.getSourceManager().isInSystemHeader(Loc)) { 5948 // Mark all prior declarations of the namespace as inline. 5949 for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS; 5950 NS = NS->getPreviousDecl()) 5951 NS->setInline(*IsInline); 5952 // Patch up the lookup table for the containing namespace. This isn't really 5953 // correct, but it's good enough for this particular case. 5954 for (DeclContext::decl_iterator I = PrevNS->decls_begin(), 5955 E = PrevNS->decls_end(); I != E; ++I) 5956 if (NamedDecl *ND = dyn_cast<NamedDecl>(*I)) 5957 PrevNS->getParent()->makeDeclVisibleInContext(ND); 5958 return; 5959 } 5960 5961 if (PrevNS->isInline()) 5962 // The user probably just forgot the 'inline', so suggest that it 5963 // be added back. 5964 S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5965 << FixItHint::CreateInsertion(KeywordLoc, "inline "); 5966 else 5967 S.Diag(Loc, diag::err_inline_namespace_mismatch) 5968 << IsInline; 5969 5970 S.Diag(PrevNS->getLocation(), diag::note_previous_definition); 5971 *IsInline = PrevNS->isInline(); 5972} 5973 5974/// ActOnStartNamespaceDef - This is called at the start of a namespace 5975/// definition. 5976Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5977 SourceLocation InlineLoc, 5978 SourceLocation NamespaceLoc, 5979 SourceLocation IdentLoc, 5980 IdentifierInfo *II, 5981 SourceLocation LBrace, 5982 AttributeList *AttrList) { 5983 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5984 // For anonymous namespace, take the location of the left brace. 5985 SourceLocation Loc = II ? IdentLoc : LBrace; 5986 bool IsInline = InlineLoc.isValid(); 5987 bool IsInvalid = false; 5988 bool IsStd = false; 5989 bool AddToKnown = false; 5990 Scope *DeclRegionScope = NamespcScope->getParent(); 5991 5992 NamespaceDecl *PrevNS = 0; 5993 if (II) { 5994 // C++ [namespace.def]p2: 5995 // The identifier in an original-namespace-definition shall not 5996 // have been previously defined in the declarative region in 5997 // which the original-namespace-definition appears. The 5998 // identifier in an original-namespace-definition is the name of 5999 // the namespace. Subsequently in that declarative region, it is 6000 // treated as an original-namespace-name. 6001 // 6002 // Since namespace names are unique in their scope, and we don't 6003 // look through using directives, just look for any ordinary names. 6004 6005 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 6006 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 6007 Decl::IDNS_Namespace; 6008 NamedDecl *PrevDecl = 0; 6009 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 6010 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 6011 ++I) { 6012 if ((*I)->getIdentifierNamespace() & IDNS) { 6013 PrevDecl = *I; 6014 break; 6015 } 6016 } 6017 6018 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 6019 6020 if (PrevNS) { 6021 // This is an extended namespace definition. 6022 if (IsInline != PrevNS->isInline()) 6023 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II, 6024 &IsInline, PrevNS); 6025 } else if (PrevDecl) { 6026 // This is an invalid name redefinition. 6027 Diag(Loc, diag::err_redefinition_different_kind) 6028 << II; 6029 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6030 IsInvalid = true; 6031 // Continue on to push Namespc as current DeclContext and return it. 6032 } else if (II->isStr("std") && 6033 CurContext->getRedeclContext()->isTranslationUnit()) { 6034 // This is the first "real" definition of the namespace "std", so update 6035 // our cache of the "std" namespace to point at this definition. 6036 PrevNS = getStdNamespace(); 6037 IsStd = true; 6038 AddToKnown = !IsInline; 6039 } else { 6040 // We've seen this namespace for the first time. 6041 AddToKnown = !IsInline; 6042 } 6043 } else { 6044 // Anonymous namespaces. 6045 6046 // Determine whether the parent already has an anonymous namespace. 6047 DeclContext *Parent = CurContext->getRedeclContext(); 6048 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6049 PrevNS = TU->getAnonymousNamespace(); 6050 } else { 6051 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 6052 PrevNS = ND->getAnonymousNamespace(); 6053 } 6054 6055 if (PrevNS && IsInline != PrevNS->isInline()) 6056 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II, 6057 &IsInline, PrevNS); 6058 } 6059 6060 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 6061 StartLoc, Loc, II, PrevNS); 6062 if (IsInvalid) 6063 Namespc->setInvalidDecl(); 6064 6065 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 6066 6067 // FIXME: Should we be merging attributes? 6068 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 6069 PushNamespaceVisibilityAttr(Attr, Loc); 6070 6071 if (IsStd) 6072 StdNamespace = Namespc; 6073 if (AddToKnown) 6074 KnownNamespaces[Namespc] = false; 6075 6076 if (II) { 6077 PushOnScopeChains(Namespc, DeclRegionScope); 6078 } else { 6079 // Link the anonymous namespace into its parent. 6080 DeclContext *Parent = CurContext->getRedeclContext(); 6081 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6082 TU->setAnonymousNamespace(Namespc); 6083 } else { 6084 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 6085 } 6086 6087 CurContext->addDecl(Namespc); 6088 6089 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 6090 // behaves as if it were replaced by 6091 // namespace unique { /* empty body */ } 6092 // using namespace unique; 6093 // namespace unique { namespace-body } 6094 // where all occurrences of 'unique' in a translation unit are 6095 // replaced by the same identifier and this identifier differs 6096 // from all other identifiers in the entire program. 6097 6098 // We just create the namespace with an empty name and then add an 6099 // implicit using declaration, just like the standard suggests. 6100 // 6101 // CodeGen enforces the "universally unique" aspect by giving all 6102 // declarations semantically contained within an anonymous 6103 // namespace internal linkage. 6104 6105 if (!PrevNS) { 6106 UsingDirectiveDecl* UD 6107 = UsingDirectiveDecl::Create(Context, Parent, 6108 /* 'using' */ LBrace, 6109 /* 'namespace' */ SourceLocation(), 6110 /* qualifier */ NestedNameSpecifierLoc(), 6111 /* identifier */ SourceLocation(), 6112 Namespc, 6113 /* Ancestor */ Parent); 6114 UD->setImplicit(); 6115 Parent->addDecl(UD); 6116 } 6117 } 6118 6119 ActOnDocumentableDecl(Namespc); 6120 6121 // Although we could have an invalid decl (i.e. the namespace name is a 6122 // redefinition), push it as current DeclContext and try to continue parsing. 6123 // FIXME: We should be able to push Namespc here, so that the each DeclContext 6124 // for the namespace has the declarations that showed up in that particular 6125 // namespace definition. 6126 PushDeclContext(NamespcScope, Namespc); 6127 return Namespc; 6128} 6129 6130/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 6131/// is a namespace alias, returns the namespace it points to. 6132static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 6133 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 6134 return AD->getNamespace(); 6135 return dyn_cast_or_null<NamespaceDecl>(D); 6136} 6137 6138/// ActOnFinishNamespaceDef - This callback is called after a namespace is 6139/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 6140void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 6141 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 6142 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 6143 Namespc->setRBraceLoc(RBrace); 6144 PopDeclContext(); 6145 if (Namespc->hasAttr<VisibilityAttr>()) 6146 PopPragmaVisibility(true, RBrace); 6147} 6148 6149CXXRecordDecl *Sema::getStdBadAlloc() const { 6150 return cast_or_null<CXXRecordDecl>( 6151 StdBadAlloc.get(Context.getExternalSource())); 6152} 6153 6154NamespaceDecl *Sema::getStdNamespace() const { 6155 return cast_or_null<NamespaceDecl>( 6156 StdNamespace.get(Context.getExternalSource())); 6157} 6158 6159/// \brief Retrieve the special "std" namespace, which may require us to 6160/// implicitly define the namespace. 6161NamespaceDecl *Sema::getOrCreateStdNamespace() { 6162 if (!StdNamespace) { 6163 // The "std" namespace has not yet been defined, so build one implicitly. 6164 StdNamespace = NamespaceDecl::Create(Context, 6165 Context.getTranslationUnitDecl(), 6166 /*Inline=*/false, 6167 SourceLocation(), SourceLocation(), 6168 &PP.getIdentifierTable().get("std"), 6169 /*PrevDecl=*/0); 6170 getStdNamespace()->setImplicit(true); 6171 } 6172 6173 return getStdNamespace(); 6174} 6175 6176bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 6177 assert(getLangOpts().CPlusPlus && 6178 "Looking for std::initializer_list outside of C++."); 6179 6180 // We're looking for implicit instantiations of 6181 // template <typename E> class std::initializer_list. 6182 6183 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 6184 return false; 6185 6186 ClassTemplateDecl *Template = 0; 6187 const TemplateArgument *Arguments = 0; 6188 6189 if (const RecordType *RT = Ty->getAs<RecordType>()) { 6190 6191 ClassTemplateSpecializationDecl *Specialization = 6192 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 6193 if (!Specialization) 6194 return false; 6195 6196 Template = Specialization->getSpecializedTemplate(); 6197 Arguments = Specialization->getTemplateArgs().data(); 6198 } else if (const TemplateSpecializationType *TST = 6199 Ty->getAs<TemplateSpecializationType>()) { 6200 Template = dyn_cast_or_null<ClassTemplateDecl>( 6201 TST->getTemplateName().getAsTemplateDecl()); 6202 Arguments = TST->getArgs(); 6203 } 6204 if (!Template) 6205 return false; 6206 6207 if (!StdInitializerList) { 6208 // Haven't recognized std::initializer_list yet, maybe this is it. 6209 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 6210 if (TemplateClass->getIdentifier() != 6211 &PP.getIdentifierTable().get("initializer_list") || 6212 !getStdNamespace()->InEnclosingNamespaceSetOf( 6213 TemplateClass->getDeclContext())) 6214 return false; 6215 // This is a template called std::initializer_list, but is it the right 6216 // template? 6217 TemplateParameterList *Params = Template->getTemplateParameters(); 6218 if (Params->getMinRequiredArguments() != 1) 6219 return false; 6220 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 6221 return false; 6222 6223 // It's the right template. 6224 StdInitializerList = Template; 6225 } 6226 6227 if (Template != StdInitializerList) 6228 return false; 6229 6230 // This is an instance of std::initializer_list. Find the argument type. 6231 if (Element) 6232 *Element = Arguments[0].getAsType(); 6233 return true; 6234} 6235 6236static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 6237 NamespaceDecl *Std = S.getStdNamespace(); 6238 if (!Std) { 6239 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6240 return 0; 6241 } 6242 6243 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 6244 Loc, Sema::LookupOrdinaryName); 6245 if (!S.LookupQualifiedName(Result, Std)) { 6246 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6247 return 0; 6248 } 6249 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 6250 if (!Template) { 6251 Result.suppressDiagnostics(); 6252 // We found something weird. Complain about the first thing we found. 6253 NamedDecl *Found = *Result.begin(); 6254 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 6255 return 0; 6256 } 6257 6258 // We found some template called std::initializer_list. Now verify that it's 6259 // correct. 6260 TemplateParameterList *Params = Template->getTemplateParameters(); 6261 if (Params->getMinRequiredArguments() != 1 || 6262 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 6263 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 6264 return 0; 6265 } 6266 6267 return Template; 6268} 6269 6270QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 6271 if (!StdInitializerList) { 6272 StdInitializerList = LookupStdInitializerList(*this, Loc); 6273 if (!StdInitializerList) 6274 return QualType(); 6275 } 6276 6277 TemplateArgumentListInfo Args(Loc, Loc); 6278 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 6279 Context.getTrivialTypeSourceInfo(Element, 6280 Loc))); 6281 return Context.getCanonicalType( 6282 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 6283} 6284 6285bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 6286 // C++ [dcl.init.list]p2: 6287 // A constructor is an initializer-list constructor if its first parameter 6288 // is of type std::initializer_list<E> or reference to possibly cv-qualified 6289 // std::initializer_list<E> for some type E, and either there are no other 6290 // parameters or else all other parameters have default arguments. 6291 if (Ctor->getNumParams() < 1 || 6292 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 6293 return false; 6294 6295 QualType ArgType = Ctor->getParamDecl(0)->getType(); 6296 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 6297 ArgType = RT->getPointeeType().getUnqualifiedType(); 6298 6299 return isStdInitializerList(ArgType, 0); 6300} 6301 6302/// \brief Determine whether a using statement is in a context where it will be 6303/// apply in all contexts. 6304static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 6305 switch (CurContext->getDeclKind()) { 6306 case Decl::TranslationUnit: 6307 return true; 6308 case Decl::LinkageSpec: 6309 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 6310 default: 6311 return false; 6312 } 6313} 6314 6315namespace { 6316 6317// Callback to only accept typo corrections that are namespaces. 6318class NamespaceValidatorCCC : public CorrectionCandidateCallback { 6319 public: 6320 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 6321 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 6322 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 6323 } 6324 return false; 6325 } 6326}; 6327 6328} 6329 6330static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 6331 CXXScopeSpec &SS, 6332 SourceLocation IdentLoc, 6333 IdentifierInfo *Ident) { 6334 NamespaceValidatorCCC Validator; 6335 R.clear(); 6336 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 6337 R.getLookupKind(), Sc, &SS, 6338 Validator)) { 6339 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 6340 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 6341 if (DeclContext *DC = S.computeDeclContext(SS, false)) 6342 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 6343 << Ident << DC << CorrectedQuotedStr << SS.getRange() 6344 << FixItHint::CreateReplacement(Corrected.getCorrectionRange(), 6345 CorrectedStr); 6346 else 6347 S.Diag(IdentLoc, diag::err_using_directive_suggest) 6348 << Ident << CorrectedQuotedStr 6349 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 6350 6351 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 6352 diag::note_namespace_defined_here) << CorrectedQuotedStr; 6353 6354 R.addDecl(Corrected.getCorrectionDecl()); 6355 return true; 6356 } 6357 return false; 6358} 6359 6360Decl *Sema::ActOnUsingDirective(Scope *S, 6361 SourceLocation UsingLoc, 6362 SourceLocation NamespcLoc, 6363 CXXScopeSpec &SS, 6364 SourceLocation IdentLoc, 6365 IdentifierInfo *NamespcName, 6366 AttributeList *AttrList) { 6367 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6368 assert(NamespcName && "Invalid NamespcName."); 6369 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 6370 6371 // This can only happen along a recovery path. 6372 while (S->getFlags() & Scope::TemplateParamScope) 6373 S = S->getParent(); 6374 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6375 6376 UsingDirectiveDecl *UDir = 0; 6377 NestedNameSpecifier *Qualifier = 0; 6378 if (SS.isSet()) 6379 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 6380 6381 // Lookup namespace name. 6382 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 6383 LookupParsedName(R, S, &SS); 6384 if (R.isAmbiguous()) 6385 return 0; 6386 6387 if (R.empty()) { 6388 R.clear(); 6389 // Allow "using namespace std;" or "using namespace ::std;" even if 6390 // "std" hasn't been defined yet, for GCC compatibility. 6391 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 6392 NamespcName->isStr("std")) { 6393 Diag(IdentLoc, diag::ext_using_undefined_std); 6394 R.addDecl(getOrCreateStdNamespace()); 6395 R.resolveKind(); 6396 } 6397 // Otherwise, attempt typo correction. 6398 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 6399 } 6400 6401 if (!R.empty()) { 6402 NamedDecl *Named = R.getFoundDecl(); 6403 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 6404 && "expected namespace decl"); 6405 // C++ [namespace.udir]p1: 6406 // A using-directive specifies that the names in the nominated 6407 // namespace can be used in the scope in which the 6408 // using-directive appears after the using-directive. During 6409 // unqualified name lookup (3.4.1), the names appear as if they 6410 // were declared in the nearest enclosing namespace which 6411 // contains both the using-directive and the nominated 6412 // namespace. [Note: in this context, "contains" means "contains 6413 // directly or indirectly". ] 6414 6415 // Find enclosing context containing both using-directive and 6416 // nominated namespace. 6417 NamespaceDecl *NS = getNamespaceDecl(Named); 6418 DeclContext *CommonAncestor = cast<DeclContext>(NS); 6419 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 6420 CommonAncestor = CommonAncestor->getParent(); 6421 6422 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 6423 SS.getWithLocInContext(Context), 6424 IdentLoc, Named, CommonAncestor); 6425 6426 if (IsUsingDirectiveInToplevelContext(CurContext) && 6427 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 6428 Diag(IdentLoc, diag::warn_using_directive_in_header); 6429 } 6430 6431 PushUsingDirective(S, UDir); 6432 } else { 6433 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6434 } 6435 6436 // FIXME: We ignore attributes for now. 6437 return UDir; 6438} 6439 6440void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 6441 // If the scope has an associated entity and the using directive is at 6442 // namespace or translation unit scope, add the UsingDirectiveDecl into 6443 // its lookup structure so qualified name lookup can find it. 6444 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 6445 if (Ctx && !Ctx->isFunctionOrMethod()) 6446 Ctx->addDecl(UDir); 6447 else 6448 // Otherwise, it is at block sope. The using-directives will affect lookup 6449 // only to the end of the scope. 6450 S->PushUsingDirective(UDir); 6451} 6452 6453 6454Decl *Sema::ActOnUsingDeclaration(Scope *S, 6455 AccessSpecifier AS, 6456 bool HasUsingKeyword, 6457 SourceLocation UsingLoc, 6458 CXXScopeSpec &SS, 6459 UnqualifiedId &Name, 6460 AttributeList *AttrList, 6461 bool IsTypeName, 6462 SourceLocation TypenameLoc) { 6463 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6464 6465 switch (Name.getKind()) { 6466 case UnqualifiedId::IK_ImplicitSelfParam: 6467 case UnqualifiedId::IK_Identifier: 6468 case UnqualifiedId::IK_OperatorFunctionId: 6469 case UnqualifiedId::IK_LiteralOperatorId: 6470 case UnqualifiedId::IK_ConversionFunctionId: 6471 break; 6472 6473 case UnqualifiedId::IK_ConstructorName: 6474 case UnqualifiedId::IK_ConstructorTemplateId: 6475 // C++11 inheriting constructors. 6476 Diag(Name.getLocStart(), 6477 getLangOpts().CPlusPlus11 ? 6478 // FIXME: Produce warn_cxx98_compat_using_decl_constructor 6479 // instead once inheriting constructors work. 6480 diag::err_using_decl_constructor_unsupported : 6481 diag::err_using_decl_constructor) 6482 << SS.getRange(); 6483 6484 if (getLangOpts().CPlusPlus11) break; 6485 6486 return 0; 6487 6488 case UnqualifiedId::IK_DestructorName: 6489 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 6490 << SS.getRange(); 6491 return 0; 6492 6493 case UnqualifiedId::IK_TemplateId: 6494 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 6495 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 6496 return 0; 6497 } 6498 6499 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 6500 DeclarationName TargetName = TargetNameInfo.getName(); 6501 if (!TargetName) 6502 return 0; 6503 6504 // Warn about using declarations. 6505 // TODO: store that the declaration was written without 'using' and 6506 // talk about access decls instead of using decls in the 6507 // diagnostics. 6508 if (!HasUsingKeyword) { 6509 UsingLoc = Name.getLocStart(); 6510 6511 Diag(UsingLoc, diag::warn_access_decl_deprecated) 6512 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 6513 } 6514 6515 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 6516 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 6517 return 0; 6518 6519 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 6520 TargetNameInfo, AttrList, 6521 /* IsInstantiation */ false, 6522 IsTypeName, TypenameLoc); 6523 if (UD) 6524 PushOnScopeChains(UD, S, /*AddToContext*/ false); 6525 6526 return UD; 6527} 6528 6529/// \brief Determine whether a using declaration considers the given 6530/// declarations as "equivalent", e.g., if they are redeclarations of 6531/// the same entity or are both typedefs of the same type. 6532static bool 6533IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 6534 bool &SuppressRedeclaration) { 6535 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 6536 SuppressRedeclaration = false; 6537 return true; 6538 } 6539 6540 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 6541 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6542 SuppressRedeclaration = true; 6543 return Context.hasSameType(TD1->getUnderlyingType(), 6544 TD2->getUnderlyingType()); 6545 } 6546 6547 return false; 6548} 6549 6550 6551/// Determines whether to create a using shadow decl for a particular 6552/// decl, given the set of decls existing prior to this using lookup. 6553bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6554 const LookupResult &Previous) { 6555 // Diagnose finding a decl which is not from a base class of the 6556 // current class. We do this now because there are cases where this 6557 // function will silently decide not to build a shadow decl, which 6558 // will pre-empt further diagnostics. 6559 // 6560 // We don't need to do this in C++0x because we do the check once on 6561 // the qualifier. 6562 // 6563 // FIXME: diagnose the following if we care enough: 6564 // struct A { int foo; }; 6565 // struct B : A { using A::foo; }; 6566 // template <class T> struct C : A {}; 6567 // template <class T> struct D : C<T> { using B::foo; } // <--- 6568 // This is invalid (during instantiation) in C++03 because B::foo 6569 // resolves to the using decl in B, which is not a base class of D<T>. 6570 // We can't diagnose it immediately because C<T> is an unknown 6571 // specialization. The UsingShadowDecl in D<T> then points directly 6572 // to A::foo, which will look well-formed when we instantiate. 6573 // The right solution is to not collapse the shadow-decl chain. 6574 if (!getLangOpts().CPlusPlus11 && CurContext->isRecord()) { 6575 DeclContext *OrigDC = Orig->getDeclContext(); 6576 6577 // Handle enums and anonymous structs. 6578 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6579 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6580 while (OrigRec->isAnonymousStructOrUnion()) 6581 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6582 6583 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6584 if (OrigDC == CurContext) { 6585 Diag(Using->getLocation(), 6586 diag::err_using_decl_nested_name_specifier_is_current_class) 6587 << Using->getQualifierLoc().getSourceRange(); 6588 Diag(Orig->getLocation(), diag::note_using_decl_target); 6589 return true; 6590 } 6591 6592 Diag(Using->getQualifierLoc().getBeginLoc(), 6593 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6594 << Using->getQualifier() 6595 << cast<CXXRecordDecl>(CurContext) 6596 << Using->getQualifierLoc().getSourceRange(); 6597 Diag(Orig->getLocation(), diag::note_using_decl_target); 6598 return true; 6599 } 6600 } 6601 6602 if (Previous.empty()) return false; 6603 6604 NamedDecl *Target = Orig; 6605 if (isa<UsingShadowDecl>(Target)) 6606 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6607 6608 // If the target happens to be one of the previous declarations, we 6609 // don't have a conflict. 6610 // 6611 // FIXME: but we might be increasing its access, in which case we 6612 // should redeclare it. 6613 NamedDecl *NonTag = 0, *Tag = 0; 6614 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6615 I != E; ++I) { 6616 NamedDecl *D = (*I)->getUnderlyingDecl(); 6617 bool Result; 6618 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6619 return Result; 6620 6621 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6622 } 6623 6624 if (Target->isFunctionOrFunctionTemplate()) { 6625 FunctionDecl *FD; 6626 if (isa<FunctionTemplateDecl>(Target)) 6627 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6628 else 6629 FD = cast<FunctionDecl>(Target); 6630 6631 NamedDecl *OldDecl = 0; 6632 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6633 case Ovl_Overload: 6634 return false; 6635 6636 case Ovl_NonFunction: 6637 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6638 break; 6639 6640 // We found a decl with the exact signature. 6641 case Ovl_Match: 6642 // If we're in a record, we want to hide the target, so we 6643 // return true (without a diagnostic) to tell the caller not to 6644 // build a shadow decl. 6645 if (CurContext->isRecord()) 6646 return true; 6647 6648 // If we're not in a record, this is an error. 6649 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6650 break; 6651 } 6652 6653 Diag(Target->getLocation(), diag::note_using_decl_target); 6654 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6655 return true; 6656 } 6657 6658 // Target is not a function. 6659 6660 if (isa<TagDecl>(Target)) { 6661 // No conflict between a tag and a non-tag. 6662 if (!Tag) return false; 6663 6664 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6665 Diag(Target->getLocation(), diag::note_using_decl_target); 6666 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6667 return true; 6668 } 6669 6670 // No conflict between a tag and a non-tag. 6671 if (!NonTag) return false; 6672 6673 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6674 Diag(Target->getLocation(), diag::note_using_decl_target); 6675 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6676 return true; 6677} 6678 6679/// Builds a shadow declaration corresponding to a 'using' declaration. 6680UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6681 UsingDecl *UD, 6682 NamedDecl *Orig) { 6683 6684 // If we resolved to another shadow declaration, just coalesce them. 6685 NamedDecl *Target = Orig; 6686 if (isa<UsingShadowDecl>(Target)) { 6687 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6688 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6689 } 6690 6691 UsingShadowDecl *Shadow 6692 = UsingShadowDecl::Create(Context, CurContext, 6693 UD->getLocation(), UD, Target); 6694 UD->addShadowDecl(Shadow); 6695 6696 Shadow->setAccess(UD->getAccess()); 6697 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6698 Shadow->setInvalidDecl(); 6699 6700 if (S) 6701 PushOnScopeChains(Shadow, S); 6702 else 6703 CurContext->addDecl(Shadow); 6704 6705 6706 return Shadow; 6707} 6708 6709/// Hides a using shadow declaration. This is required by the current 6710/// using-decl implementation when a resolvable using declaration in a 6711/// class is followed by a declaration which would hide or override 6712/// one or more of the using decl's targets; for example: 6713/// 6714/// struct Base { void foo(int); }; 6715/// struct Derived : Base { 6716/// using Base::foo; 6717/// void foo(int); 6718/// }; 6719/// 6720/// The governing language is C++03 [namespace.udecl]p12: 6721/// 6722/// When a using-declaration brings names from a base class into a 6723/// derived class scope, member functions in the derived class 6724/// override and/or hide member functions with the same name and 6725/// parameter types in a base class (rather than conflicting). 6726/// 6727/// There are two ways to implement this: 6728/// (1) optimistically create shadow decls when they're not hidden 6729/// by existing declarations, or 6730/// (2) don't create any shadow decls (or at least don't make them 6731/// visible) until we've fully parsed/instantiated the class. 6732/// The problem with (1) is that we might have to retroactively remove 6733/// a shadow decl, which requires several O(n) operations because the 6734/// decl structures are (very reasonably) not designed for removal. 6735/// (2) avoids this but is very fiddly and phase-dependent. 6736void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6737 if (Shadow->getDeclName().getNameKind() == 6738 DeclarationName::CXXConversionFunctionName) 6739 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6740 6741 // Remove it from the DeclContext... 6742 Shadow->getDeclContext()->removeDecl(Shadow); 6743 6744 // ...and the scope, if applicable... 6745 if (S) { 6746 S->RemoveDecl(Shadow); 6747 IdResolver.RemoveDecl(Shadow); 6748 } 6749 6750 // ...and the using decl. 6751 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6752 6753 // TODO: complain somehow if Shadow was used. It shouldn't 6754 // be possible for this to happen, because...? 6755} 6756 6757/// Builds a using declaration. 6758/// 6759/// \param IsInstantiation - Whether this call arises from an 6760/// instantiation of an unresolved using declaration. We treat 6761/// the lookup differently for these declarations. 6762NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6763 SourceLocation UsingLoc, 6764 CXXScopeSpec &SS, 6765 const DeclarationNameInfo &NameInfo, 6766 AttributeList *AttrList, 6767 bool IsInstantiation, 6768 bool IsTypeName, 6769 SourceLocation TypenameLoc) { 6770 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6771 SourceLocation IdentLoc = NameInfo.getLoc(); 6772 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6773 6774 // FIXME: We ignore attributes for now. 6775 6776 if (SS.isEmpty()) { 6777 Diag(IdentLoc, diag::err_using_requires_qualname); 6778 return 0; 6779 } 6780 6781 // Do the redeclaration lookup in the current scope. 6782 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6783 ForRedeclaration); 6784 Previous.setHideTags(false); 6785 if (S) { 6786 LookupName(Previous, S); 6787 6788 // It is really dumb that we have to do this. 6789 LookupResult::Filter F = Previous.makeFilter(); 6790 while (F.hasNext()) { 6791 NamedDecl *D = F.next(); 6792 if (!isDeclInScope(D, CurContext, S)) 6793 F.erase(); 6794 } 6795 F.done(); 6796 } else { 6797 assert(IsInstantiation && "no scope in non-instantiation"); 6798 assert(CurContext->isRecord() && "scope not record in instantiation"); 6799 LookupQualifiedName(Previous, CurContext); 6800 } 6801 6802 // Check for invalid redeclarations. 6803 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6804 return 0; 6805 6806 // Check for bad qualifiers. 6807 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6808 return 0; 6809 6810 DeclContext *LookupContext = computeDeclContext(SS); 6811 NamedDecl *D; 6812 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6813 if (!LookupContext) { 6814 if (IsTypeName) { 6815 // FIXME: not all declaration name kinds are legal here 6816 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6817 UsingLoc, TypenameLoc, 6818 QualifierLoc, 6819 IdentLoc, NameInfo.getName()); 6820 } else { 6821 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6822 QualifierLoc, NameInfo); 6823 } 6824 } else { 6825 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6826 NameInfo, IsTypeName); 6827 } 6828 D->setAccess(AS); 6829 CurContext->addDecl(D); 6830 6831 if (!LookupContext) return D; 6832 UsingDecl *UD = cast<UsingDecl>(D); 6833 6834 if (RequireCompleteDeclContext(SS, LookupContext)) { 6835 UD->setInvalidDecl(); 6836 return UD; 6837 } 6838 6839 // The normal rules do not apply to inheriting constructor declarations. 6840 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6841 if (CheckInheritingConstructorUsingDecl(UD)) 6842 UD->setInvalidDecl(); 6843 return UD; 6844 } 6845 6846 // Otherwise, look up the target name. 6847 6848 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6849 6850 // Unlike most lookups, we don't always want to hide tag 6851 // declarations: tag names are visible through the using declaration 6852 // even if hidden by ordinary names, *except* in a dependent context 6853 // where it's important for the sanity of two-phase lookup. 6854 if (!IsInstantiation) 6855 R.setHideTags(false); 6856 6857 // For the purposes of this lookup, we have a base object type 6858 // equal to that of the current context. 6859 if (CurContext->isRecord()) { 6860 R.setBaseObjectType( 6861 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6862 } 6863 6864 LookupQualifiedName(R, LookupContext); 6865 6866 if (R.empty()) { 6867 Diag(IdentLoc, diag::err_no_member) 6868 << NameInfo.getName() << LookupContext << SS.getRange(); 6869 UD->setInvalidDecl(); 6870 return UD; 6871 } 6872 6873 if (R.isAmbiguous()) { 6874 UD->setInvalidDecl(); 6875 return UD; 6876 } 6877 6878 if (IsTypeName) { 6879 // If we asked for a typename and got a non-type decl, error out. 6880 if (!R.getAsSingle<TypeDecl>()) { 6881 Diag(IdentLoc, diag::err_using_typename_non_type); 6882 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6883 Diag((*I)->getUnderlyingDecl()->getLocation(), 6884 diag::note_using_decl_target); 6885 UD->setInvalidDecl(); 6886 return UD; 6887 } 6888 } else { 6889 // If we asked for a non-typename and we got a type, error out, 6890 // but only if this is an instantiation of an unresolved using 6891 // decl. Otherwise just silently find the type name. 6892 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6893 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6894 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6895 UD->setInvalidDecl(); 6896 return UD; 6897 } 6898 } 6899 6900 // C++0x N2914 [namespace.udecl]p6: 6901 // A using-declaration shall not name a namespace. 6902 if (R.getAsSingle<NamespaceDecl>()) { 6903 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6904 << SS.getRange(); 6905 UD->setInvalidDecl(); 6906 return UD; 6907 } 6908 6909 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6910 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6911 BuildUsingShadowDecl(S, UD, *I); 6912 } 6913 6914 return UD; 6915} 6916 6917/// Additional checks for a using declaration referring to a constructor name. 6918bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6919 assert(!UD->isTypeName() && "expecting a constructor name"); 6920 6921 const Type *SourceType = UD->getQualifier()->getAsType(); 6922 assert(SourceType && 6923 "Using decl naming constructor doesn't have type in scope spec."); 6924 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6925 6926 // Check whether the named type is a direct base class. 6927 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6928 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6929 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6930 BaseIt != BaseE; ++BaseIt) { 6931 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6932 if (CanonicalSourceType == BaseType) 6933 break; 6934 if (BaseIt->getType()->isDependentType()) 6935 break; 6936 } 6937 6938 if (BaseIt == BaseE) { 6939 // Did not find SourceType in the bases. 6940 Diag(UD->getUsingLocation(), 6941 diag::err_using_decl_constructor_not_in_direct_base) 6942 << UD->getNameInfo().getSourceRange() 6943 << QualType(SourceType, 0) << TargetClass; 6944 return true; 6945 } 6946 6947 if (!CurContext->isDependentContext()) 6948 BaseIt->setInheritConstructors(); 6949 6950 return false; 6951} 6952 6953/// Checks that the given using declaration is not an invalid 6954/// redeclaration. Note that this is checking only for the using decl 6955/// itself, not for any ill-formedness among the UsingShadowDecls. 6956bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6957 bool isTypeName, 6958 const CXXScopeSpec &SS, 6959 SourceLocation NameLoc, 6960 const LookupResult &Prev) { 6961 // C++03 [namespace.udecl]p8: 6962 // C++0x [namespace.udecl]p10: 6963 // A using-declaration is a declaration and can therefore be used 6964 // repeatedly where (and only where) multiple declarations are 6965 // allowed. 6966 // 6967 // That's in non-member contexts. 6968 if (!CurContext->getRedeclContext()->isRecord()) 6969 return false; 6970 6971 NestedNameSpecifier *Qual 6972 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6973 6974 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6975 NamedDecl *D = *I; 6976 6977 bool DTypename; 6978 NestedNameSpecifier *DQual; 6979 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6980 DTypename = UD->isTypeName(); 6981 DQual = UD->getQualifier(); 6982 } else if (UnresolvedUsingValueDecl *UD 6983 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6984 DTypename = false; 6985 DQual = UD->getQualifier(); 6986 } else if (UnresolvedUsingTypenameDecl *UD 6987 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6988 DTypename = true; 6989 DQual = UD->getQualifier(); 6990 } else continue; 6991 6992 // using decls differ if one says 'typename' and the other doesn't. 6993 // FIXME: non-dependent using decls? 6994 if (isTypeName != DTypename) continue; 6995 6996 // using decls differ if they name different scopes (but note that 6997 // template instantiation can cause this check to trigger when it 6998 // didn't before instantiation). 6999 if (Context.getCanonicalNestedNameSpecifier(Qual) != 7000 Context.getCanonicalNestedNameSpecifier(DQual)) 7001 continue; 7002 7003 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 7004 Diag(D->getLocation(), diag::note_using_decl) << 1; 7005 return true; 7006 } 7007 7008 return false; 7009} 7010 7011 7012/// Checks that the given nested-name qualifier used in a using decl 7013/// in the current context is appropriately related to the current 7014/// scope. If an error is found, diagnoses it and returns true. 7015bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 7016 const CXXScopeSpec &SS, 7017 SourceLocation NameLoc) { 7018 DeclContext *NamedContext = computeDeclContext(SS); 7019 7020 if (!CurContext->isRecord()) { 7021 // C++03 [namespace.udecl]p3: 7022 // C++0x [namespace.udecl]p8: 7023 // A using-declaration for a class member shall be a member-declaration. 7024 7025 // If we weren't able to compute a valid scope, it must be a 7026 // dependent class scope. 7027 if (!NamedContext || NamedContext->isRecord()) { 7028 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 7029 << SS.getRange(); 7030 return true; 7031 } 7032 7033 // Otherwise, everything is known to be fine. 7034 return false; 7035 } 7036 7037 // The current scope is a record. 7038 7039 // If the named context is dependent, we can't decide much. 7040 if (!NamedContext) { 7041 // FIXME: in C++0x, we can diagnose if we can prove that the 7042 // nested-name-specifier does not refer to a base class, which is 7043 // still possible in some cases. 7044 7045 // Otherwise we have to conservatively report that things might be 7046 // okay. 7047 return false; 7048 } 7049 7050 if (!NamedContext->isRecord()) { 7051 // Ideally this would point at the last name in the specifier, 7052 // but we don't have that level of source info. 7053 Diag(SS.getRange().getBegin(), 7054 diag::err_using_decl_nested_name_specifier_is_not_class) 7055 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 7056 return true; 7057 } 7058 7059 if (!NamedContext->isDependentContext() && 7060 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 7061 return true; 7062 7063 if (getLangOpts().CPlusPlus11) { 7064 // C++0x [namespace.udecl]p3: 7065 // In a using-declaration used as a member-declaration, the 7066 // nested-name-specifier shall name a base class of the class 7067 // being defined. 7068 7069 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 7070 cast<CXXRecordDecl>(NamedContext))) { 7071 if (CurContext == NamedContext) { 7072 Diag(NameLoc, 7073 diag::err_using_decl_nested_name_specifier_is_current_class) 7074 << SS.getRange(); 7075 return true; 7076 } 7077 7078 Diag(SS.getRange().getBegin(), 7079 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7080 << (NestedNameSpecifier*) SS.getScopeRep() 7081 << cast<CXXRecordDecl>(CurContext) 7082 << SS.getRange(); 7083 return true; 7084 } 7085 7086 return false; 7087 } 7088 7089 // C++03 [namespace.udecl]p4: 7090 // A using-declaration used as a member-declaration shall refer 7091 // to a member of a base class of the class being defined [etc.]. 7092 7093 // Salient point: SS doesn't have to name a base class as long as 7094 // lookup only finds members from base classes. Therefore we can 7095 // diagnose here only if we can prove that that can't happen, 7096 // i.e. if the class hierarchies provably don't intersect. 7097 7098 // TODO: it would be nice if "definitely valid" results were cached 7099 // in the UsingDecl and UsingShadowDecl so that these checks didn't 7100 // need to be repeated. 7101 7102 struct UserData { 7103 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 7104 7105 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 7106 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7107 Data->Bases.insert(Base); 7108 return true; 7109 } 7110 7111 bool hasDependentBases(const CXXRecordDecl *Class) { 7112 return !Class->forallBases(collect, this); 7113 } 7114 7115 /// Returns true if the base is dependent or is one of the 7116 /// accumulated base classes. 7117 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 7118 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7119 return !Data->Bases.count(Base); 7120 } 7121 7122 bool mightShareBases(const CXXRecordDecl *Class) { 7123 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 7124 } 7125 }; 7126 7127 UserData Data; 7128 7129 // Returns false if we find a dependent base. 7130 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 7131 return false; 7132 7133 // Returns false if the class has a dependent base or if it or one 7134 // of its bases is present in the base set of the current context. 7135 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 7136 return false; 7137 7138 Diag(SS.getRange().getBegin(), 7139 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7140 << (NestedNameSpecifier*) SS.getScopeRep() 7141 << cast<CXXRecordDecl>(CurContext) 7142 << SS.getRange(); 7143 7144 return true; 7145} 7146 7147Decl *Sema::ActOnAliasDeclaration(Scope *S, 7148 AccessSpecifier AS, 7149 MultiTemplateParamsArg TemplateParamLists, 7150 SourceLocation UsingLoc, 7151 UnqualifiedId &Name, 7152 TypeResult Type) { 7153 // Skip up to the relevant declaration scope. 7154 while (S->getFlags() & Scope::TemplateParamScope) 7155 S = S->getParent(); 7156 assert((S->getFlags() & Scope::DeclScope) && 7157 "got alias-declaration outside of declaration scope"); 7158 7159 if (Type.isInvalid()) 7160 return 0; 7161 7162 bool Invalid = false; 7163 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 7164 TypeSourceInfo *TInfo = 0; 7165 GetTypeFromParser(Type.get(), &TInfo); 7166 7167 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 7168 return 0; 7169 7170 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 7171 UPPC_DeclarationType)) { 7172 Invalid = true; 7173 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 7174 TInfo->getTypeLoc().getBeginLoc()); 7175 } 7176 7177 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 7178 LookupName(Previous, S); 7179 7180 // Warn about shadowing the name of a template parameter. 7181 if (Previous.isSingleResult() && 7182 Previous.getFoundDecl()->isTemplateParameter()) { 7183 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 7184 Previous.clear(); 7185 } 7186 7187 assert(Name.Kind == UnqualifiedId::IK_Identifier && 7188 "name in alias declaration must be an identifier"); 7189 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 7190 Name.StartLocation, 7191 Name.Identifier, TInfo); 7192 7193 NewTD->setAccess(AS); 7194 7195 if (Invalid) 7196 NewTD->setInvalidDecl(); 7197 7198 CheckTypedefForVariablyModifiedType(S, NewTD); 7199 Invalid |= NewTD->isInvalidDecl(); 7200 7201 bool Redeclaration = false; 7202 7203 NamedDecl *NewND; 7204 if (TemplateParamLists.size()) { 7205 TypeAliasTemplateDecl *OldDecl = 0; 7206 TemplateParameterList *OldTemplateParams = 0; 7207 7208 if (TemplateParamLists.size() != 1) { 7209 Diag(UsingLoc, diag::err_alias_template_extra_headers) 7210 << SourceRange(TemplateParamLists[1]->getTemplateLoc(), 7211 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); 7212 } 7213 TemplateParameterList *TemplateParams = TemplateParamLists[0]; 7214 7215 // Only consider previous declarations in the same scope. 7216 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 7217 /*ExplicitInstantiationOrSpecialization*/false); 7218 if (!Previous.empty()) { 7219 Redeclaration = true; 7220 7221 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 7222 if (!OldDecl && !Invalid) { 7223 Diag(UsingLoc, diag::err_redefinition_different_kind) 7224 << Name.Identifier; 7225 7226 NamedDecl *OldD = Previous.getRepresentativeDecl(); 7227 if (OldD->getLocation().isValid()) 7228 Diag(OldD->getLocation(), diag::note_previous_definition); 7229 7230 Invalid = true; 7231 } 7232 7233 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 7234 if (TemplateParameterListsAreEqual(TemplateParams, 7235 OldDecl->getTemplateParameters(), 7236 /*Complain=*/true, 7237 TPL_TemplateMatch)) 7238 OldTemplateParams = OldDecl->getTemplateParameters(); 7239 else 7240 Invalid = true; 7241 7242 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 7243 if (!Invalid && 7244 !Context.hasSameType(OldTD->getUnderlyingType(), 7245 NewTD->getUnderlyingType())) { 7246 // FIXME: The C++0x standard does not clearly say this is ill-formed, 7247 // but we can't reasonably accept it. 7248 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 7249 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 7250 if (OldTD->getLocation().isValid()) 7251 Diag(OldTD->getLocation(), diag::note_previous_definition); 7252 Invalid = true; 7253 } 7254 } 7255 } 7256 7257 // Merge any previous default template arguments into our parameters, 7258 // and check the parameter list. 7259 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 7260 TPC_TypeAliasTemplate)) 7261 return 0; 7262 7263 TypeAliasTemplateDecl *NewDecl = 7264 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 7265 Name.Identifier, TemplateParams, 7266 NewTD); 7267 7268 NewDecl->setAccess(AS); 7269 7270 if (Invalid) 7271 NewDecl->setInvalidDecl(); 7272 else if (OldDecl) 7273 NewDecl->setPreviousDeclaration(OldDecl); 7274 7275 NewND = NewDecl; 7276 } else { 7277 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 7278 NewND = NewTD; 7279 } 7280 7281 if (!Redeclaration) 7282 PushOnScopeChains(NewND, S); 7283 7284 ActOnDocumentableDecl(NewND); 7285 return NewND; 7286} 7287 7288Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 7289 SourceLocation NamespaceLoc, 7290 SourceLocation AliasLoc, 7291 IdentifierInfo *Alias, 7292 CXXScopeSpec &SS, 7293 SourceLocation IdentLoc, 7294 IdentifierInfo *Ident) { 7295 7296 // Lookup the namespace name. 7297 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 7298 LookupParsedName(R, S, &SS); 7299 7300 // Check if we have a previous declaration with the same name. 7301 NamedDecl *PrevDecl 7302 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 7303 ForRedeclaration); 7304 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 7305 PrevDecl = 0; 7306 7307 if (PrevDecl) { 7308 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 7309 // We already have an alias with the same name that points to the same 7310 // namespace, so don't create a new one. 7311 // FIXME: At some point, we'll want to create the (redundant) 7312 // declaration to maintain better source information. 7313 if (!R.isAmbiguous() && !R.empty() && 7314 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 7315 return 0; 7316 } 7317 7318 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 7319 diag::err_redefinition_different_kind; 7320 Diag(AliasLoc, DiagID) << Alias; 7321 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7322 return 0; 7323 } 7324 7325 if (R.isAmbiguous()) 7326 return 0; 7327 7328 if (R.empty()) { 7329 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 7330 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 7331 return 0; 7332 } 7333 } 7334 7335 NamespaceAliasDecl *AliasDecl = 7336 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 7337 Alias, SS.getWithLocInContext(Context), 7338 IdentLoc, R.getFoundDecl()); 7339 7340 PushOnScopeChains(AliasDecl, S); 7341 return AliasDecl; 7342} 7343 7344Sema::ImplicitExceptionSpecification 7345Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 7346 CXXMethodDecl *MD) { 7347 CXXRecordDecl *ClassDecl = MD->getParent(); 7348 7349 // C++ [except.spec]p14: 7350 // An implicitly declared special member function (Clause 12) shall have an 7351 // exception-specification. [...] 7352 ImplicitExceptionSpecification ExceptSpec(*this); 7353 if (ClassDecl->isInvalidDecl()) 7354 return ExceptSpec; 7355 7356 // Direct base-class constructors. 7357 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7358 BEnd = ClassDecl->bases_end(); 7359 B != BEnd; ++B) { 7360 if (B->isVirtual()) // Handled below. 7361 continue; 7362 7363 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7364 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7365 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7366 // If this is a deleted function, add it anyway. This might be conformant 7367 // with the standard. This might not. I'm not sure. It might not matter. 7368 if (Constructor) 7369 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7370 } 7371 } 7372 7373 // Virtual base-class constructors. 7374 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7375 BEnd = ClassDecl->vbases_end(); 7376 B != BEnd; ++B) { 7377 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7378 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7379 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7380 // If this is a deleted function, add it anyway. This might be conformant 7381 // with the standard. This might not. I'm not sure. It might not matter. 7382 if (Constructor) 7383 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7384 } 7385 } 7386 7387 // Field constructors. 7388 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7389 FEnd = ClassDecl->field_end(); 7390 F != FEnd; ++F) { 7391 if (F->hasInClassInitializer()) { 7392 if (Expr *E = F->getInClassInitializer()) 7393 ExceptSpec.CalledExpr(E); 7394 else if (!F->isInvalidDecl()) 7395 // DR1351: 7396 // If the brace-or-equal-initializer of a non-static data member 7397 // invokes a defaulted default constructor of its class or of an 7398 // enclosing class in a potentially evaluated subexpression, the 7399 // program is ill-formed. 7400 // 7401 // This resolution is unworkable: the exception specification of the 7402 // default constructor can be needed in an unevaluated context, in 7403 // particular, in the operand of a noexcept-expression, and we can be 7404 // unable to compute an exception specification for an enclosed class. 7405 // 7406 // We do not allow an in-class initializer to require the evaluation 7407 // of the exception specification for any in-class initializer whose 7408 // definition is not lexically complete. 7409 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 7410 } else if (const RecordType *RecordTy 7411 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 7412 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7413 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 7414 // If this is a deleted function, add it anyway. This might be conformant 7415 // with the standard. This might not. I'm not sure. It might not matter. 7416 // In particular, the problem is that this function never gets called. It 7417 // might just be ill-formed because this function attempts to refer to 7418 // a deleted function here. 7419 if (Constructor) 7420 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 7421 } 7422 } 7423 7424 return ExceptSpec; 7425} 7426 7427namespace { 7428/// RAII object to register a special member as being currently declared. 7429struct DeclaringSpecialMember { 7430 Sema &S; 7431 Sema::SpecialMemberDecl D; 7432 bool WasAlreadyBeingDeclared; 7433 7434 DeclaringSpecialMember(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM) 7435 : S(S), D(RD, CSM) { 7436 WasAlreadyBeingDeclared = !S.SpecialMembersBeingDeclared.insert(D); 7437 if (WasAlreadyBeingDeclared) 7438 // This almost never happens, but if it does, ensure that our cache 7439 // doesn't contain a stale result. 7440 S.SpecialMemberCache.clear(); 7441 7442 // FIXME: Register a note to be produced if we encounter an error while 7443 // declaring the special member. 7444 } 7445 ~DeclaringSpecialMember() { 7446 if (!WasAlreadyBeingDeclared) 7447 S.SpecialMembersBeingDeclared.erase(D); 7448 } 7449 7450 /// \brief Are we already trying to declare this special member? 7451 bool isAlreadyBeingDeclared() const { 7452 return WasAlreadyBeingDeclared; 7453 } 7454}; 7455} 7456 7457CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 7458 CXXRecordDecl *ClassDecl) { 7459 // C++ [class.ctor]p5: 7460 // A default constructor for a class X is a constructor of class X 7461 // that can be called without an argument. If there is no 7462 // user-declared constructor for class X, a default constructor is 7463 // implicitly declared. An implicitly-declared default constructor 7464 // is an inline public member of its class. 7465 assert(ClassDecl->needsImplicitDefaultConstructor() && 7466 "Should not build implicit default constructor!"); 7467 7468 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDefaultConstructor); 7469 if (DSM.isAlreadyBeingDeclared()) 7470 return 0; 7471 7472 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 7473 CXXDefaultConstructor, 7474 false); 7475 7476 // Create the actual constructor declaration. 7477 CanQualType ClassType 7478 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7479 SourceLocation ClassLoc = ClassDecl->getLocation(); 7480 DeclarationName Name 7481 = Context.DeclarationNames.getCXXConstructorName(ClassType); 7482 DeclarationNameInfo NameInfo(Name, ClassLoc); 7483 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 7484 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 7485 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 7486 Constexpr); 7487 DefaultCon->setAccess(AS_public); 7488 DefaultCon->setDefaulted(); 7489 DefaultCon->setImplicit(); 7490 7491 // Build an exception specification pointing back at this constructor. 7492 FunctionProtoType::ExtProtoInfo EPI; 7493 EPI.ExceptionSpecType = EST_Unevaluated; 7494 EPI.ExceptionSpecDecl = DefaultCon; 7495 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7496 7497 // We don't need to use SpecialMemberIsTrivial here; triviality for default 7498 // constructors is easy to compute. 7499 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 7500 7501 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 7502 DefaultCon->setDeletedAsWritten(); 7503 7504 // Note that we have declared this constructor. 7505 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 7506 7507 if (Scope *S = getScopeForContext(ClassDecl)) 7508 PushOnScopeChains(DefaultCon, S, false); 7509 ClassDecl->addDecl(DefaultCon); 7510 7511 return DefaultCon; 7512} 7513 7514void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 7515 CXXConstructorDecl *Constructor) { 7516 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 7517 !Constructor->doesThisDeclarationHaveABody() && 7518 !Constructor->isDeleted()) && 7519 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 7520 7521 CXXRecordDecl *ClassDecl = Constructor->getParent(); 7522 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 7523 7524 SynthesizedFunctionScope Scope(*this, Constructor); 7525 DiagnosticErrorTrap Trap(Diags); 7526 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 7527 Trap.hasErrorOccurred()) { 7528 Diag(CurrentLocation, diag::note_member_synthesized_at) 7529 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 7530 Constructor->setInvalidDecl(); 7531 return; 7532 } 7533 7534 SourceLocation Loc = Constructor->getLocation(); 7535 Constructor->setBody(new (Context) CompoundStmt(Loc)); 7536 7537 Constructor->setUsed(); 7538 MarkVTableUsed(CurrentLocation, ClassDecl); 7539 7540 if (ASTMutationListener *L = getASTMutationListener()) { 7541 L->CompletedImplicitDefinition(Constructor); 7542 } 7543} 7544 7545void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 7546 // Check that any explicitly-defaulted methods have exception specifications 7547 // compatible with their implicit exception specifications. 7548 CheckDelayedExplicitlyDefaultedMemberExceptionSpecs(); 7549} 7550 7551void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 7552 // We start with an initial pass over the base classes to collect those that 7553 // inherit constructors from. If there are none, we can forgo all further 7554 // processing. 7555 typedef SmallVector<const RecordType *, 4> BasesVector; 7556 BasesVector BasesToInheritFrom; 7557 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 7558 BaseE = ClassDecl->bases_end(); 7559 BaseIt != BaseE; ++BaseIt) { 7560 if (BaseIt->getInheritConstructors()) { 7561 QualType Base = BaseIt->getType(); 7562 if (Base->isDependentType()) { 7563 // If we inherit constructors from anything that is dependent, just 7564 // abort processing altogether. We'll get another chance for the 7565 // instantiations. 7566 return; 7567 } 7568 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 7569 } 7570 } 7571 if (BasesToInheritFrom.empty()) 7572 return; 7573 7574 // Now collect the constructors that we already have in the current class. 7575 // Those take precedence over inherited constructors. 7576 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7577 // unless there is a user-declared constructor with the same signature in 7578 // the class where the using-declaration appears. 7579 llvm::SmallSet<const Type *, 8> ExistingConstructors; 7580 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 7581 CtorE = ClassDecl->ctor_end(); 7582 CtorIt != CtorE; ++CtorIt) { 7583 ExistingConstructors.insert( 7584 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 7585 } 7586 7587 DeclarationName CreatedCtorName = 7588 Context.DeclarationNames.getCXXConstructorName( 7589 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 7590 7591 // Now comes the true work. 7592 // First, we keep a map from constructor types to the base that introduced 7593 // them. Needed for finding conflicting constructors. We also keep the 7594 // actually inserted declarations in there, for pretty diagnostics. 7595 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 7596 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 7597 ConstructorToSourceMap InheritedConstructors; 7598 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 7599 BaseE = BasesToInheritFrom.end(); 7600 BaseIt != BaseE; ++BaseIt) { 7601 const RecordType *Base = *BaseIt; 7602 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 7603 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 7604 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 7605 CtorE = BaseDecl->ctor_end(); 7606 CtorIt != CtorE; ++CtorIt) { 7607 // Find the using declaration for inheriting this base's constructors. 7608 // FIXME: Don't perform name lookup just to obtain a source location! 7609 DeclarationName Name = 7610 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7611 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 7612 LookupQualifiedName(Result, CurContext); 7613 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 7614 SourceLocation UsingLoc = UD ? UD->getLocation() : 7615 ClassDecl->getLocation(); 7616 7617 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 7618 // from the class X named in the using-declaration consists of actual 7619 // constructors and notional constructors that result from the 7620 // transformation of defaulted parameters as follows: 7621 // - all non-template default constructors of X, and 7622 // - for each non-template constructor of X that has at least one 7623 // parameter with a default argument, the set of constructors that 7624 // results from omitting any ellipsis parameter specification and 7625 // successively omitting parameters with a default argument from the 7626 // end of the parameter-type-list. 7627 CXXConstructorDecl *BaseCtor = *CtorIt; 7628 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7629 const FunctionProtoType *BaseCtorType = 7630 BaseCtor->getType()->getAs<FunctionProtoType>(); 7631 7632 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7633 maxParams = BaseCtor->getNumParams(); 7634 params <= maxParams; ++params) { 7635 // Skip default constructors. They're never inherited. 7636 if (params == 0) 7637 continue; 7638 // Skip copy and move constructors for the same reason. 7639 if (CanBeCopyOrMove && params == 1) 7640 continue; 7641 7642 // Build up a function type for this particular constructor. 7643 // FIXME: The working paper does not consider that the exception spec 7644 // for the inheriting constructor might be larger than that of the 7645 // source. This code doesn't yet, either. When it does, this code will 7646 // need to be delayed until after exception specifications and in-class 7647 // member initializers are attached. 7648 const Type *NewCtorType; 7649 if (params == maxParams) 7650 NewCtorType = BaseCtorType; 7651 else { 7652 SmallVector<QualType, 16> Args; 7653 for (unsigned i = 0; i < params; ++i) { 7654 Args.push_back(BaseCtorType->getArgType(i)); 7655 } 7656 FunctionProtoType::ExtProtoInfo ExtInfo = 7657 BaseCtorType->getExtProtoInfo(); 7658 ExtInfo.Variadic = false; 7659 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7660 Args.data(), params, ExtInfo) 7661 .getTypePtr(); 7662 } 7663 const Type *CanonicalNewCtorType = 7664 Context.getCanonicalType(NewCtorType); 7665 7666 // Now that we have the type, first check if the class already has a 7667 // constructor with this signature. 7668 if (ExistingConstructors.count(CanonicalNewCtorType)) 7669 continue; 7670 7671 // Then we check if we have already declared an inherited constructor 7672 // with this signature. 7673 std::pair<ConstructorToSourceMap::iterator, bool> result = 7674 InheritedConstructors.insert(std::make_pair( 7675 CanonicalNewCtorType, 7676 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7677 if (!result.second) { 7678 // Already in the map. If it came from a different class, that's an 7679 // error. Not if it's from the same. 7680 CanQualType PreviousBase = result.first->second.first; 7681 if (CanonicalBase != PreviousBase) { 7682 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7683 const CXXConstructorDecl *PrevBaseCtor = 7684 PrevCtor->getInheritedConstructor(); 7685 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7686 7687 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7688 Diag(BaseCtor->getLocation(), 7689 diag::note_using_decl_constructor_conflict_current_ctor); 7690 Diag(PrevBaseCtor->getLocation(), 7691 diag::note_using_decl_constructor_conflict_previous_ctor); 7692 Diag(PrevCtor->getLocation(), 7693 diag::note_using_decl_constructor_conflict_previous_using); 7694 } 7695 continue; 7696 } 7697 7698 // OK, we're there, now add the constructor. 7699 // C++0x [class.inhctor]p8: [...] that would be performed by a 7700 // user-written inline constructor [...] 7701 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7702 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7703 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7704 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7705 /*ImplicitlyDeclared=*/true, 7706 // FIXME: Due to a defect in the standard, we treat inherited 7707 // constructors as constexpr even if that makes them ill-formed. 7708 /*Constexpr=*/BaseCtor->isConstexpr()); 7709 NewCtor->setAccess(BaseCtor->getAccess()); 7710 7711 // Build up the parameter decls and add them. 7712 SmallVector<ParmVarDecl *, 16> ParamDecls; 7713 for (unsigned i = 0; i < params; ++i) { 7714 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7715 UsingLoc, UsingLoc, 7716 /*IdentifierInfo=*/0, 7717 BaseCtorType->getArgType(i), 7718 /*TInfo=*/0, SC_None, 7719 SC_None, /*DefaultArg=*/0)); 7720 } 7721 NewCtor->setParams(ParamDecls); 7722 NewCtor->setInheritedConstructor(BaseCtor); 7723 7724 ClassDecl->addDecl(NewCtor); 7725 result.first->second.second = NewCtor; 7726 } 7727 } 7728 } 7729} 7730 7731Sema::ImplicitExceptionSpecification 7732Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 7733 CXXRecordDecl *ClassDecl = MD->getParent(); 7734 7735 // C++ [except.spec]p14: 7736 // An implicitly declared special member function (Clause 12) shall have 7737 // an exception-specification. 7738 ImplicitExceptionSpecification ExceptSpec(*this); 7739 if (ClassDecl->isInvalidDecl()) 7740 return ExceptSpec; 7741 7742 // Direct base-class destructors. 7743 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7744 BEnd = ClassDecl->bases_end(); 7745 B != BEnd; ++B) { 7746 if (B->isVirtual()) // Handled below. 7747 continue; 7748 7749 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7750 ExceptSpec.CalledDecl(B->getLocStart(), 7751 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7752 } 7753 7754 // Virtual base-class destructors. 7755 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7756 BEnd = ClassDecl->vbases_end(); 7757 B != BEnd; ++B) { 7758 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7759 ExceptSpec.CalledDecl(B->getLocStart(), 7760 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7761 } 7762 7763 // Field destructors. 7764 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7765 FEnd = ClassDecl->field_end(); 7766 F != FEnd; ++F) { 7767 if (const RecordType *RecordTy 7768 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7769 ExceptSpec.CalledDecl(F->getLocation(), 7770 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7771 } 7772 7773 return ExceptSpec; 7774} 7775 7776CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7777 // C++ [class.dtor]p2: 7778 // If a class has no user-declared destructor, a destructor is 7779 // declared implicitly. An implicitly-declared destructor is an 7780 // inline public member of its class. 7781 assert(ClassDecl->needsImplicitDestructor()); 7782 7783 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDestructor); 7784 if (DSM.isAlreadyBeingDeclared()) 7785 return 0; 7786 7787 // Create the actual destructor declaration. 7788 CanQualType ClassType 7789 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7790 SourceLocation ClassLoc = ClassDecl->getLocation(); 7791 DeclarationName Name 7792 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7793 DeclarationNameInfo NameInfo(Name, ClassLoc); 7794 CXXDestructorDecl *Destructor 7795 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7796 QualType(), 0, /*isInline=*/true, 7797 /*isImplicitlyDeclared=*/true); 7798 Destructor->setAccess(AS_public); 7799 Destructor->setDefaulted(); 7800 Destructor->setImplicit(); 7801 7802 // Build an exception specification pointing back at this destructor. 7803 FunctionProtoType::ExtProtoInfo EPI; 7804 EPI.ExceptionSpecType = EST_Unevaluated; 7805 EPI.ExceptionSpecDecl = Destructor; 7806 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7807 7808 AddOverriddenMethods(ClassDecl, Destructor); 7809 7810 // We don't need to use SpecialMemberIsTrivial here; triviality for 7811 // destructors is easy to compute. 7812 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7813 7814 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7815 Destructor->setDeletedAsWritten(); 7816 7817 // Note that we have declared this destructor. 7818 ++ASTContext::NumImplicitDestructorsDeclared; 7819 7820 // Introduce this destructor into its scope. 7821 if (Scope *S = getScopeForContext(ClassDecl)) 7822 PushOnScopeChains(Destructor, S, false); 7823 ClassDecl->addDecl(Destructor); 7824 7825 return Destructor; 7826} 7827 7828void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7829 CXXDestructorDecl *Destructor) { 7830 assert((Destructor->isDefaulted() && 7831 !Destructor->doesThisDeclarationHaveABody() && 7832 !Destructor->isDeleted()) && 7833 "DefineImplicitDestructor - call it for implicit default dtor"); 7834 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7835 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7836 7837 if (Destructor->isInvalidDecl()) 7838 return; 7839 7840 SynthesizedFunctionScope Scope(*this, Destructor); 7841 7842 DiagnosticErrorTrap Trap(Diags); 7843 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7844 Destructor->getParent()); 7845 7846 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7847 Diag(CurrentLocation, diag::note_member_synthesized_at) 7848 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7849 7850 Destructor->setInvalidDecl(); 7851 return; 7852 } 7853 7854 SourceLocation Loc = Destructor->getLocation(); 7855 Destructor->setBody(new (Context) CompoundStmt(Loc)); 7856 Destructor->setImplicitlyDefined(true); 7857 Destructor->setUsed(); 7858 MarkVTableUsed(CurrentLocation, ClassDecl); 7859 7860 if (ASTMutationListener *L = getASTMutationListener()) { 7861 L->CompletedImplicitDefinition(Destructor); 7862 } 7863} 7864 7865/// \brief Perform any semantic analysis which needs to be delayed until all 7866/// pending class member declarations have been parsed. 7867void Sema::ActOnFinishCXXMemberDecls() { 7868 // Perform any deferred checking of exception specifications for virtual 7869 // destructors. 7870 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 7871 i != e; ++i) { 7872 const CXXDestructorDecl *Dtor = 7873 DelayedDestructorExceptionSpecChecks[i].first; 7874 assert(!Dtor->getParent()->isDependentType() && 7875 "Should not ever add destructors of templates into the list."); 7876 CheckOverridingFunctionExceptionSpec(Dtor, 7877 DelayedDestructorExceptionSpecChecks[i].second); 7878 } 7879 DelayedDestructorExceptionSpecChecks.clear(); 7880} 7881 7882void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 7883 CXXDestructorDecl *Destructor) { 7884 assert(getLangOpts().CPlusPlus11 && 7885 "adjusting dtor exception specs was introduced in c++11"); 7886 7887 // C++11 [class.dtor]p3: 7888 // A declaration of a destructor that does not have an exception- 7889 // specification is implicitly considered to have the same exception- 7890 // specification as an implicit declaration. 7891 const FunctionProtoType *DtorType = Destructor->getType()-> 7892 getAs<FunctionProtoType>(); 7893 if (DtorType->hasExceptionSpec()) 7894 return; 7895 7896 // Replace the destructor's type, building off the existing one. Fortunately, 7897 // the only thing of interest in the destructor type is its extended info. 7898 // The return and arguments are fixed. 7899 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 7900 EPI.ExceptionSpecType = EST_Unevaluated; 7901 EPI.ExceptionSpecDecl = Destructor; 7902 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7903 7904 // FIXME: If the destructor has a body that could throw, and the newly created 7905 // spec doesn't allow exceptions, we should emit a warning, because this 7906 // change in behavior can break conforming C++03 programs at runtime. 7907 // However, we don't have a body or an exception specification yet, so it 7908 // needs to be done somewhere else. 7909} 7910 7911/// When generating a defaulted copy or move assignment operator, if a field 7912/// should be copied with __builtin_memcpy rather than via explicit assignments, 7913/// do so. This optimization only applies for arrays of scalars, and for arrays 7914/// of class type where the selected copy/move-assignment operator is trivial. 7915static StmtResult 7916buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T, 7917 Expr *To, Expr *From) { 7918 // Compute the size of the memory buffer to be copied. 7919 QualType SizeType = S.Context.getSizeType(); 7920 llvm::APInt Size(S.Context.getTypeSize(SizeType), 7921 S.Context.getTypeSizeInChars(T).getQuantity()); 7922 7923 // Take the address of the field references for "from" and "to". We 7924 // directly construct UnaryOperators here because semantic analysis 7925 // does not permit us to take the address of an xvalue. 7926 From = new (S.Context) UnaryOperator(From, UO_AddrOf, 7927 S.Context.getPointerType(From->getType()), 7928 VK_RValue, OK_Ordinary, Loc); 7929 To = new (S.Context) UnaryOperator(To, UO_AddrOf, 7930 S.Context.getPointerType(To->getType()), 7931 VK_RValue, OK_Ordinary, Loc); 7932 7933 const Type *E = T->getBaseElementTypeUnsafe(); 7934 bool NeedsCollectableMemCpy = 7935 E->isRecordType() && E->getAs<RecordType>()->getDecl()->hasObjectMember(); 7936 7937 // Create a reference to the __builtin_objc_memmove_collectable function 7938 StringRef MemCpyName = NeedsCollectableMemCpy ? 7939 "__builtin_objc_memmove_collectable" : 7940 "__builtin_memcpy"; 7941 LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc, 7942 Sema::LookupOrdinaryName); 7943 S.LookupName(R, S.TUScope, true); 7944 7945 FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>(); 7946 if (!MemCpy) 7947 // Something went horribly wrong earlier, and we will have complained 7948 // about it. 7949 return StmtError(); 7950 7951 ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy, 7952 VK_RValue, Loc, 0); 7953 assert(MemCpyRef.isUsable() && "Builtin reference cannot fail"); 7954 7955 Expr *CallArgs[] = { 7956 To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc) 7957 }; 7958 ExprResult Call = S.ActOnCallExpr(/*Scope=*/0, MemCpyRef.take(), 7959 Loc, CallArgs, Loc); 7960 7961 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7962 return S.Owned(Call.takeAs<Stmt>()); 7963} 7964 7965/// \brief Builds a statement that copies/moves the given entity from \p From to 7966/// \c To. 7967/// 7968/// This routine is used to copy/move the members of a class with an 7969/// implicitly-declared copy/move assignment operator. When the entities being 7970/// copied are arrays, this routine builds for loops to copy them. 7971/// 7972/// \param S The Sema object used for type-checking. 7973/// 7974/// \param Loc The location where the implicit copy/move is being generated. 7975/// 7976/// \param T The type of the expressions being copied/moved. Both expressions 7977/// must have this type. 7978/// 7979/// \param To The expression we are copying/moving to. 7980/// 7981/// \param From The expression we are copying/moving from. 7982/// 7983/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7984/// Otherwise, it's a non-static member subobject. 7985/// 7986/// \param Copying Whether we're copying or moving. 7987/// 7988/// \param Depth Internal parameter recording the depth of the recursion. 7989/// 7990/// \returns A statement or a loop that copies the expressions, or StmtResult(0) 7991/// if a memcpy should be used instead. 7992static StmtResult 7993buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T, 7994 Expr *To, Expr *From, 7995 bool CopyingBaseSubobject, bool Copying, 7996 unsigned Depth = 0) { 7997 // C++11 [class.copy]p28: 7998 // Each subobject is assigned in the manner appropriate to its type: 7999 // 8000 // - if the subobject is of class type, as if by a call to operator= with 8001 // the subobject as the object expression and the corresponding 8002 // subobject of x as a single function argument (as if by explicit 8003 // qualification; that is, ignoring any possible virtual overriding 8004 // functions in more derived classes); 8005 // 8006 // C++03 [class.copy]p13: 8007 // - if the subobject is of class type, the copy assignment operator for 8008 // the class is used (as if by explicit qualification; that is, 8009 // ignoring any possible virtual overriding functions in more derived 8010 // classes); 8011 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 8012 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8013 8014 // Look for operator=. 8015 DeclarationName Name 8016 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8017 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 8018 S.LookupQualifiedName(OpLookup, ClassDecl, false); 8019 8020 // Prior to C++11, filter out any result that isn't a copy/move-assignment 8021 // operator. 8022 if (!S.getLangOpts().CPlusPlus11) { 8023 LookupResult::Filter F = OpLookup.makeFilter(); 8024 while (F.hasNext()) { 8025 NamedDecl *D = F.next(); 8026 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 8027 if (Method->isCopyAssignmentOperator() || 8028 (!Copying && Method->isMoveAssignmentOperator())) 8029 continue; 8030 8031 F.erase(); 8032 } 8033 F.done(); 8034 } 8035 8036 // Suppress the protected check (C++ [class.protected]) for each of the 8037 // assignment operators we found. This strange dance is required when 8038 // we're assigning via a base classes's copy-assignment operator. To 8039 // ensure that we're getting the right base class subobject (without 8040 // ambiguities), we need to cast "this" to that subobject type; to 8041 // ensure that we don't go through the virtual call mechanism, we need 8042 // to qualify the operator= name with the base class (see below). However, 8043 // this means that if the base class has a protected copy assignment 8044 // operator, the protected member access check will fail. So, we 8045 // rewrite "protected" access to "public" access in this case, since we 8046 // know by construction that we're calling from a derived class. 8047 if (CopyingBaseSubobject) { 8048 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 8049 L != LEnd; ++L) { 8050 if (L.getAccess() == AS_protected) 8051 L.setAccess(AS_public); 8052 } 8053 } 8054 8055 // Create the nested-name-specifier that will be used to qualify the 8056 // reference to operator=; this is required to suppress the virtual 8057 // call mechanism. 8058 CXXScopeSpec SS; 8059 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 8060 SS.MakeTrivial(S.Context, 8061 NestedNameSpecifier::Create(S.Context, 0, false, 8062 CanonicalT), 8063 Loc); 8064 8065 // Create the reference to operator=. 8066 ExprResult OpEqualRef 8067 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 8068 /*TemplateKWLoc=*/SourceLocation(), 8069 /*FirstQualifierInScope=*/0, 8070 OpLookup, 8071 /*TemplateArgs=*/0, 8072 /*SuppressQualifierCheck=*/true); 8073 if (OpEqualRef.isInvalid()) 8074 return StmtError(); 8075 8076 // Build the call to the assignment operator. 8077 8078 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 8079 OpEqualRef.takeAs<Expr>(), 8080 Loc, &From, 1, Loc); 8081 if (Call.isInvalid()) 8082 return StmtError(); 8083 8084 // If we built a call to a trivial 'operator=' while copying an array, 8085 // bail out. We'll replace the whole shebang with a memcpy. 8086 CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get()); 8087 if (CE && CE->getMethodDecl()->isTrivial() && Depth) 8088 return StmtResult((Stmt*)0); 8089 8090 // Convert to an expression-statement, and clean up any produced 8091 // temporaries. 8092 return S.ActOnExprStmt(Call); 8093 } 8094 8095 // - if the subobject is of scalar type, the built-in assignment 8096 // operator is used. 8097 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 8098 if (!ArrayTy) { 8099 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 8100 if (Assignment.isInvalid()) 8101 return StmtError(); 8102 return S.ActOnExprStmt(Assignment); 8103 } 8104 8105 // - if the subobject is an array, each element is assigned, in the 8106 // manner appropriate to the element type; 8107 8108 // Construct a loop over the array bounds, e.g., 8109 // 8110 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 8111 // 8112 // that will copy each of the array elements. 8113 QualType SizeType = S.Context.getSizeType(); 8114 8115 // Create the iteration variable. 8116 IdentifierInfo *IterationVarName = 0; 8117 { 8118 SmallString<8> Str; 8119 llvm::raw_svector_ostream OS(Str); 8120 OS << "__i" << Depth; 8121 IterationVarName = &S.Context.Idents.get(OS.str()); 8122 } 8123 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 8124 IterationVarName, SizeType, 8125 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 8126 SC_None, SC_None); 8127 8128 // Initialize the iteration variable to zero. 8129 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 8130 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 8131 8132 // Create a reference to the iteration variable; we'll use this several 8133 // times throughout. 8134 Expr *IterationVarRef 8135 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 8136 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 8137 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 8138 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 8139 8140 // Create the DeclStmt that holds the iteration variable. 8141 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 8142 8143 // Subscript the "from" and "to" expressions with the iteration variable. 8144 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 8145 IterationVarRefRVal, 8146 Loc)); 8147 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 8148 IterationVarRefRVal, 8149 Loc)); 8150 if (!Copying) // Cast to rvalue 8151 From = CastForMoving(S, From); 8152 8153 // Build the copy/move for an individual element of the array. 8154 StmtResult Copy = 8155 buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(), 8156 To, From, CopyingBaseSubobject, 8157 Copying, Depth + 1); 8158 // Bail out if copying fails or if we determined that we should use memcpy. 8159 if (Copy.isInvalid() || !Copy.get()) 8160 return Copy; 8161 8162 // Create the comparison against the array bound. 8163 llvm::APInt Upper 8164 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 8165 Expr *Comparison 8166 = new (S.Context) BinaryOperator(IterationVarRefRVal, 8167 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 8168 BO_NE, S.Context.BoolTy, 8169 VK_RValue, OK_Ordinary, Loc, false); 8170 8171 // Create the pre-increment of the iteration variable. 8172 Expr *Increment 8173 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 8174 VK_LValue, OK_Ordinary, Loc); 8175 8176 // Construct the loop that copies all elements of this array. 8177 return S.ActOnForStmt(Loc, Loc, InitStmt, 8178 S.MakeFullExpr(Comparison), 8179 0, S.MakeFullDiscardedValueExpr(Increment), 8180 Loc, Copy.take()); 8181} 8182 8183static StmtResult 8184buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 8185 Expr *To, Expr *From, 8186 bool CopyingBaseSubobject, bool Copying) { 8187 // Maybe we should use a memcpy? 8188 if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() && 8189 T.isTriviallyCopyableType(S.Context)) 8190 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 8191 8192 StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From, 8193 CopyingBaseSubobject, 8194 Copying, 0)); 8195 8196 // If we ended up picking a trivial assignment operator for an array of a 8197 // non-trivially-copyable class type, just emit a memcpy. 8198 if (!Result.isInvalid() && !Result.get()) 8199 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 8200 8201 return Result; 8202} 8203 8204Sema::ImplicitExceptionSpecification 8205Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 8206 CXXRecordDecl *ClassDecl = MD->getParent(); 8207 8208 ImplicitExceptionSpecification ExceptSpec(*this); 8209 if (ClassDecl->isInvalidDecl()) 8210 return ExceptSpec; 8211 8212 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 8213 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 8214 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 8215 8216 // C++ [except.spec]p14: 8217 // An implicitly declared special member function (Clause 12) shall have an 8218 // exception-specification. [...] 8219 8220 // It is unspecified whether or not an implicit copy assignment operator 8221 // attempts to deduplicate calls to assignment operators of virtual bases are 8222 // made. As such, this exception specification is effectively unspecified. 8223 // Based on a similar decision made for constness in C++0x, we're erring on 8224 // the side of assuming such calls to be made regardless of whether they 8225 // actually happen. 8226 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8227 BaseEnd = ClassDecl->bases_end(); 8228 Base != BaseEnd; ++Base) { 8229 if (Base->isVirtual()) 8230 continue; 8231 8232 CXXRecordDecl *BaseClassDecl 8233 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8234 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 8235 ArgQuals, false, 0)) 8236 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 8237 } 8238 8239 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8240 BaseEnd = ClassDecl->vbases_end(); 8241 Base != BaseEnd; ++Base) { 8242 CXXRecordDecl *BaseClassDecl 8243 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8244 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 8245 ArgQuals, false, 0)) 8246 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 8247 } 8248 8249 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8250 FieldEnd = ClassDecl->field_end(); 8251 Field != FieldEnd; 8252 ++Field) { 8253 QualType FieldType = Context.getBaseElementType(Field->getType()); 8254 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8255 if (CXXMethodDecl *CopyAssign = 8256 LookupCopyingAssignment(FieldClassDecl, 8257 ArgQuals | FieldType.getCVRQualifiers(), 8258 false, 0)) 8259 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 8260 } 8261 } 8262 8263 return ExceptSpec; 8264} 8265 8266CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 8267 // Note: The following rules are largely analoguous to the copy 8268 // constructor rules. Note that virtual bases are not taken into account 8269 // for determining the argument type of the operator. Note also that 8270 // operators taking an object instead of a reference are allowed. 8271 assert(ClassDecl->needsImplicitCopyAssignment()); 8272 8273 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyAssignment); 8274 if (DSM.isAlreadyBeingDeclared()) 8275 return 0; 8276 8277 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8278 QualType RetType = Context.getLValueReferenceType(ArgType); 8279 if (ClassDecl->implicitCopyAssignmentHasConstParam()) 8280 ArgType = ArgType.withConst(); 8281 ArgType = Context.getLValueReferenceType(ArgType); 8282 8283 // An implicitly-declared copy assignment operator is an inline public 8284 // member of its class. 8285 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8286 SourceLocation ClassLoc = ClassDecl->getLocation(); 8287 DeclarationNameInfo NameInfo(Name, ClassLoc); 8288 CXXMethodDecl *CopyAssignment 8289 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8290 /*TInfo=*/0, /*isStatic=*/false, 8291 /*StorageClassAsWritten=*/SC_None, 8292 /*isInline=*/true, /*isConstexpr=*/false, 8293 SourceLocation()); 8294 CopyAssignment->setAccess(AS_public); 8295 CopyAssignment->setDefaulted(); 8296 CopyAssignment->setImplicit(); 8297 8298 // Build an exception specification pointing back at this member. 8299 FunctionProtoType::ExtProtoInfo EPI; 8300 EPI.ExceptionSpecType = EST_Unevaluated; 8301 EPI.ExceptionSpecDecl = CopyAssignment; 8302 CopyAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 8303 8304 // Add the parameter to the operator. 8305 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 8306 ClassLoc, ClassLoc, /*Id=*/0, 8307 ArgType, /*TInfo=*/0, 8308 SC_None, 8309 SC_None, 0); 8310 CopyAssignment->setParams(FromParam); 8311 8312 AddOverriddenMethods(ClassDecl, CopyAssignment); 8313 8314 CopyAssignment->setTrivial( 8315 ClassDecl->needsOverloadResolutionForCopyAssignment() 8316 ? SpecialMemberIsTrivial(CopyAssignment, CXXCopyAssignment) 8317 : ClassDecl->hasTrivialCopyAssignment()); 8318 8319 // C++0x [class.copy]p19: 8320 // .... If the class definition does not explicitly declare a copy 8321 // assignment operator, there is no user-declared move constructor, and 8322 // there is no user-declared move assignment operator, a copy assignment 8323 // operator is implicitly declared as defaulted. 8324 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 8325 CopyAssignment->setDeletedAsWritten(); 8326 8327 // Note that we have added this copy-assignment operator. 8328 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 8329 8330 if (Scope *S = getScopeForContext(ClassDecl)) 8331 PushOnScopeChains(CopyAssignment, S, false); 8332 ClassDecl->addDecl(CopyAssignment); 8333 8334 return CopyAssignment; 8335} 8336 8337void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 8338 CXXMethodDecl *CopyAssignOperator) { 8339 assert((CopyAssignOperator->isDefaulted() && 8340 CopyAssignOperator->isOverloadedOperator() && 8341 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 8342 !CopyAssignOperator->doesThisDeclarationHaveABody() && 8343 !CopyAssignOperator->isDeleted()) && 8344 "DefineImplicitCopyAssignment called for wrong function"); 8345 8346 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 8347 8348 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 8349 CopyAssignOperator->setInvalidDecl(); 8350 return; 8351 } 8352 8353 CopyAssignOperator->setUsed(); 8354 8355 SynthesizedFunctionScope Scope(*this, CopyAssignOperator); 8356 DiagnosticErrorTrap Trap(Diags); 8357 8358 // C++0x [class.copy]p30: 8359 // The implicitly-defined or explicitly-defaulted copy assignment operator 8360 // for a non-union class X performs memberwise copy assignment of its 8361 // subobjects. The direct base classes of X are assigned first, in the 8362 // order of their declaration in the base-specifier-list, and then the 8363 // immediate non-static data members of X are assigned, in the order in 8364 // which they were declared in the class definition. 8365 8366 // The statements that form the synthesized function body. 8367 SmallVector<Stmt*, 8> Statements; 8368 8369 // The parameter for the "other" object, which we are copying from. 8370 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 8371 Qualifiers OtherQuals = Other->getType().getQualifiers(); 8372 QualType OtherRefType = Other->getType(); 8373 if (const LValueReferenceType *OtherRef 8374 = OtherRefType->getAs<LValueReferenceType>()) { 8375 OtherRefType = OtherRef->getPointeeType(); 8376 OtherQuals = OtherRefType.getQualifiers(); 8377 } 8378 8379 // Our location for everything implicitly-generated. 8380 SourceLocation Loc = CopyAssignOperator->getLocation(); 8381 8382 // Construct a reference to the "other" object. We'll be using this 8383 // throughout the generated ASTs. 8384 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8385 assert(OtherRef && "Reference to parameter cannot fail!"); 8386 8387 // Construct the "this" pointer. We'll be using this throughout the generated 8388 // ASTs. 8389 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8390 assert(This && "Reference to this cannot fail!"); 8391 8392 // Assign base classes. 8393 bool Invalid = false; 8394 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8395 E = ClassDecl->bases_end(); Base != E; ++Base) { 8396 // Form the assignment: 8397 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 8398 QualType BaseType = Base->getType().getUnqualifiedType(); 8399 if (!BaseType->isRecordType()) { 8400 Invalid = true; 8401 continue; 8402 } 8403 8404 CXXCastPath BasePath; 8405 BasePath.push_back(Base); 8406 8407 // Construct the "from" expression, which is an implicit cast to the 8408 // appropriately-qualified base type. 8409 Expr *From = OtherRef; 8410 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 8411 CK_UncheckedDerivedToBase, 8412 VK_LValue, &BasePath).take(); 8413 8414 // Dereference "this". 8415 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8416 8417 // Implicitly cast "this" to the appropriately-qualified base type. 8418 To = ImpCastExprToType(To.take(), 8419 Context.getCVRQualifiedType(BaseType, 8420 CopyAssignOperator->getTypeQualifiers()), 8421 CK_UncheckedDerivedToBase, 8422 VK_LValue, &BasePath); 8423 8424 // Build the copy. 8425 StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType, 8426 To.get(), From, 8427 /*CopyingBaseSubobject=*/true, 8428 /*Copying=*/true); 8429 if (Copy.isInvalid()) { 8430 Diag(CurrentLocation, diag::note_member_synthesized_at) 8431 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8432 CopyAssignOperator->setInvalidDecl(); 8433 return; 8434 } 8435 8436 // Success! Record the copy. 8437 Statements.push_back(Copy.takeAs<Expr>()); 8438 } 8439 8440 // Assign non-static members. 8441 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8442 FieldEnd = ClassDecl->field_end(); 8443 Field != FieldEnd; ++Field) { 8444 if (Field->isUnnamedBitfield()) 8445 continue; 8446 8447 // Check for members of reference type; we can't copy those. 8448 if (Field->getType()->isReferenceType()) { 8449 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8450 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8451 Diag(Field->getLocation(), diag::note_declared_at); 8452 Diag(CurrentLocation, diag::note_member_synthesized_at) 8453 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8454 Invalid = true; 8455 continue; 8456 } 8457 8458 // Check for members of const-qualified, non-class type. 8459 QualType BaseType = Context.getBaseElementType(Field->getType()); 8460 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8461 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8462 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8463 Diag(Field->getLocation(), diag::note_declared_at); 8464 Diag(CurrentLocation, diag::note_member_synthesized_at) 8465 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8466 Invalid = true; 8467 continue; 8468 } 8469 8470 // Suppress assigning zero-width bitfields. 8471 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8472 continue; 8473 8474 QualType FieldType = Field->getType().getNonReferenceType(); 8475 if (FieldType->isIncompleteArrayType()) { 8476 assert(ClassDecl->hasFlexibleArrayMember() && 8477 "Incomplete array type is not valid"); 8478 continue; 8479 } 8480 8481 // Build references to the field in the object we're copying from and to. 8482 CXXScopeSpec SS; // Intentionally empty 8483 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8484 LookupMemberName); 8485 MemberLookup.addDecl(*Field); 8486 MemberLookup.resolveKind(); 8487 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8488 Loc, /*IsArrow=*/false, 8489 SS, SourceLocation(), 0, 8490 MemberLookup, 0); 8491 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8492 Loc, /*IsArrow=*/true, 8493 SS, SourceLocation(), 0, 8494 MemberLookup, 0); 8495 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8496 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8497 8498 // Build the copy of this field. 8499 StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType, 8500 To.get(), From.get(), 8501 /*CopyingBaseSubobject=*/false, 8502 /*Copying=*/true); 8503 if (Copy.isInvalid()) { 8504 Diag(CurrentLocation, diag::note_member_synthesized_at) 8505 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8506 CopyAssignOperator->setInvalidDecl(); 8507 return; 8508 } 8509 8510 // Success! Record the copy. 8511 Statements.push_back(Copy.takeAs<Stmt>()); 8512 } 8513 8514 if (!Invalid) { 8515 // Add a "return *this;" 8516 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8517 8518 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8519 if (Return.isInvalid()) 8520 Invalid = true; 8521 else { 8522 Statements.push_back(Return.takeAs<Stmt>()); 8523 8524 if (Trap.hasErrorOccurred()) { 8525 Diag(CurrentLocation, diag::note_member_synthesized_at) 8526 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8527 Invalid = true; 8528 } 8529 } 8530 } 8531 8532 if (Invalid) { 8533 CopyAssignOperator->setInvalidDecl(); 8534 return; 8535 } 8536 8537 StmtResult Body; 8538 { 8539 CompoundScopeRAII CompoundScope(*this); 8540 Body = ActOnCompoundStmt(Loc, Loc, Statements, 8541 /*isStmtExpr=*/false); 8542 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8543 } 8544 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 8545 8546 if (ASTMutationListener *L = getASTMutationListener()) { 8547 L->CompletedImplicitDefinition(CopyAssignOperator); 8548 } 8549} 8550 8551Sema::ImplicitExceptionSpecification 8552Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 8553 CXXRecordDecl *ClassDecl = MD->getParent(); 8554 8555 ImplicitExceptionSpecification ExceptSpec(*this); 8556 if (ClassDecl->isInvalidDecl()) 8557 return ExceptSpec; 8558 8559 // C++0x [except.spec]p14: 8560 // An implicitly declared special member function (Clause 12) shall have an 8561 // exception-specification. [...] 8562 8563 // It is unspecified whether or not an implicit move assignment operator 8564 // attempts to deduplicate calls to assignment operators of virtual bases are 8565 // made. As such, this exception specification is effectively unspecified. 8566 // Based on a similar decision made for constness in C++0x, we're erring on 8567 // the side of assuming such calls to be made regardless of whether they 8568 // actually happen. 8569 // Note that a move constructor is not implicitly declared when there are 8570 // virtual bases, but it can still be user-declared and explicitly defaulted. 8571 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8572 BaseEnd = ClassDecl->bases_end(); 8573 Base != BaseEnd; ++Base) { 8574 if (Base->isVirtual()) 8575 continue; 8576 8577 CXXRecordDecl *BaseClassDecl 8578 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8579 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8580 0, false, 0)) 8581 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8582 } 8583 8584 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8585 BaseEnd = ClassDecl->vbases_end(); 8586 Base != BaseEnd; ++Base) { 8587 CXXRecordDecl *BaseClassDecl 8588 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8589 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8590 0, false, 0)) 8591 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8592 } 8593 8594 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8595 FieldEnd = ClassDecl->field_end(); 8596 Field != FieldEnd; 8597 ++Field) { 8598 QualType FieldType = Context.getBaseElementType(Field->getType()); 8599 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8600 if (CXXMethodDecl *MoveAssign = 8601 LookupMovingAssignment(FieldClassDecl, 8602 FieldType.getCVRQualifiers(), 8603 false, 0)) 8604 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 8605 } 8606 } 8607 8608 return ExceptSpec; 8609} 8610 8611/// Determine whether the class type has any direct or indirect virtual base 8612/// classes which have a non-trivial move assignment operator. 8613static bool 8614hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 8615 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8616 BaseEnd = ClassDecl->vbases_end(); 8617 Base != BaseEnd; ++Base) { 8618 CXXRecordDecl *BaseClass = 8619 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8620 8621 // Try to declare the move assignment. If it would be deleted, then the 8622 // class does not have a non-trivial move assignment. 8623 if (BaseClass->needsImplicitMoveAssignment()) 8624 S.DeclareImplicitMoveAssignment(BaseClass); 8625 8626 if (BaseClass->hasNonTrivialMoveAssignment()) 8627 return true; 8628 } 8629 8630 return false; 8631} 8632 8633/// Determine whether the given type either has a move constructor or is 8634/// trivially copyable. 8635static bool 8636hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8637 Type = S.Context.getBaseElementType(Type); 8638 8639 // FIXME: Technically, non-trivially-copyable non-class types, such as 8640 // reference types, are supposed to return false here, but that appears 8641 // to be a standard defect. 8642 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8643 if (!ClassDecl || !ClassDecl->getDefinition() || ClassDecl->isInvalidDecl()) 8644 return true; 8645 8646 if (Type.isTriviallyCopyableType(S.Context)) 8647 return true; 8648 8649 if (IsConstructor) { 8650 // FIXME: Need this because otherwise hasMoveConstructor isn't guaranteed to 8651 // give the right answer. 8652 if (ClassDecl->needsImplicitMoveConstructor()) 8653 S.DeclareImplicitMoveConstructor(ClassDecl); 8654 return ClassDecl->hasMoveConstructor(); 8655 } 8656 8657 // FIXME: Need this because otherwise hasMoveAssignment isn't guaranteed to 8658 // give the right answer. 8659 if (ClassDecl->needsImplicitMoveAssignment()) 8660 S.DeclareImplicitMoveAssignment(ClassDecl); 8661 return ClassDecl->hasMoveAssignment(); 8662} 8663 8664/// Determine whether all non-static data members and direct or virtual bases 8665/// of class \p ClassDecl have either a move operation, or are trivially 8666/// copyable. 8667static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8668 bool IsConstructor) { 8669 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8670 BaseEnd = ClassDecl->bases_end(); 8671 Base != BaseEnd; ++Base) { 8672 if (Base->isVirtual()) 8673 continue; 8674 8675 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8676 return false; 8677 } 8678 8679 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8680 BaseEnd = ClassDecl->vbases_end(); 8681 Base != BaseEnd; ++Base) { 8682 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8683 return false; 8684 } 8685 8686 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8687 FieldEnd = ClassDecl->field_end(); 8688 Field != FieldEnd; ++Field) { 8689 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 8690 return false; 8691 } 8692 8693 return true; 8694} 8695 8696CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8697 // C++11 [class.copy]p20: 8698 // If the definition of a class X does not explicitly declare a move 8699 // assignment operator, one will be implicitly declared as defaulted 8700 // if and only if: 8701 // 8702 // - [first 4 bullets] 8703 assert(ClassDecl->needsImplicitMoveAssignment()); 8704 8705 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveAssignment); 8706 if (DSM.isAlreadyBeingDeclared()) 8707 return 0; 8708 8709 // [Checked after we build the declaration] 8710 // - the move assignment operator would not be implicitly defined as 8711 // deleted, 8712 8713 // [DR1402]: 8714 // - X has no direct or indirect virtual base class with a non-trivial 8715 // move assignment operator, and 8716 // - each of X's non-static data members and direct or virtual base classes 8717 // has a type that either has a move assignment operator or is trivially 8718 // copyable. 8719 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8720 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8721 ClassDecl->setFailedImplicitMoveAssignment(); 8722 return 0; 8723 } 8724 8725 // Note: The following rules are largely analoguous to the move 8726 // constructor rules. 8727 8728 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8729 QualType RetType = Context.getLValueReferenceType(ArgType); 8730 ArgType = Context.getRValueReferenceType(ArgType); 8731 8732 // An implicitly-declared move assignment operator is an inline public 8733 // member of its class. 8734 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8735 SourceLocation ClassLoc = ClassDecl->getLocation(); 8736 DeclarationNameInfo NameInfo(Name, ClassLoc); 8737 CXXMethodDecl *MoveAssignment 8738 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8739 /*TInfo=*/0, /*isStatic=*/false, 8740 /*StorageClassAsWritten=*/SC_None, 8741 /*isInline=*/true, 8742 /*isConstexpr=*/false, 8743 SourceLocation()); 8744 MoveAssignment->setAccess(AS_public); 8745 MoveAssignment->setDefaulted(); 8746 MoveAssignment->setImplicit(); 8747 8748 // Build an exception specification pointing back at this member. 8749 FunctionProtoType::ExtProtoInfo EPI; 8750 EPI.ExceptionSpecType = EST_Unevaluated; 8751 EPI.ExceptionSpecDecl = MoveAssignment; 8752 MoveAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 8753 8754 // Add the parameter to the operator. 8755 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8756 ClassLoc, ClassLoc, /*Id=*/0, 8757 ArgType, /*TInfo=*/0, 8758 SC_None, 8759 SC_None, 0); 8760 MoveAssignment->setParams(FromParam); 8761 8762 AddOverriddenMethods(ClassDecl, MoveAssignment); 8763 8764 MoveAssignment->setTrivial( 8765 ClassDecl->needsOverloadResolutionForMoveAssignment() 8766 ? SpecialMemberIsTrivial(MoveAssignment, CXXMoveAssignment) 8767 : ClassDecl->hasTrivialMoveAssignment()); 8768 8769 // C++0x [class.copy]p9: 8770 // If the definition of a class X does not explicitly declare a move 8771 // assignment operator, one will be implicitly declared as defaulted if and 8772 // only if: 8773 // [...] 8774 // - the move assignment operator would not be implicitly defined as 8775 // deleted. 8776 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8777 // Cache this result so that we don't try to generate this over and over 8778 // on every lookup, leaking memory and wasting time. 8779 ClassDecl->setFailedImplicitMoveAssignment(); 8780 return 0; 8781 } 8782 8783 // Note that we have added this copy-assignment operator. 8784 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8785 8786 if (Scope *S = getScopeForContext(ClassDecl)) 8787 PushOnScopeChains(MoveAssignment, S, false); 8788 ClassDecl->addDecl(MoveAssignment); 8789 8790 return MoveAssignment; 8791} 8792 8793void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8794 CXXMethodDecl *MoveAssignOperator) { 8795 assert((MoveAssignOperator->isDefaulted() && 8796 MoveAssignOperator->isOverloadedOperator() && 8797 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8798 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8799 !MoveAssignOperator->isDeleted()) && 8800 "DefineImplicitMoveAssignment called for wrong function"); 8801 8802 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8803 8804 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8805 MoveAssignOperator->setInvalidDecl(); 8806 return; 8807 } 8808 8809 MoveAssignOperator->setUsed(); 8810 8811 SynthesizedFunctionScope Scope(*this, MoveAssignOperator); 8812 DiagnosticErrorTrap Trap(Diags); 8813 8814 // C++0x [class.copy]p28: 8815 // The implicitly-defined or move assignment operator for a non-union class 8816 // X performs memberwise move assignment of its subobjects. The direct base 8817 // classes of X are assigned first, in the order of their declaration in the 8818 // base-specifier-list, and then the immediate non-static data members of X 8819 // are assigned, in the order in which they were declared in the class 8820 // definition. 8821 8822 // The statements that form the synthesized function body. 8823 SmallVector<Stmt*, 8> Statements; 8824 8825 // The parameter for the "other" object, which we are move from. 8826 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8827 QualType OtherRefType = Other->getType()-> 8828 getAs<RValueReferenceType>()->getPointeeType(); 8829 assert(OtherRefType.getQualifiers() == 0 && 8830 "Bad argument type of defaulted move assignment"); 8831 8832 // Our location for everything implicitly-generated. 8833 SourceLocation Loc = MoveAssignOperator->getLocation(); 8834 8835 // Construct a reference to the "other" object. We'll be using this 8836 // throughout the generated ASTs. 8837 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8838 assert(OtherRef && "Reference to parameter cannot fail!"); 8839 // Cast to rvalue. 8840 OtherRef = CastForMoving(*this, OtherRef); 8841 8842 // Construct the "this" pointer. We'll be using this throughout the generated 8843 // ASTs. 8844 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8845 assert(This && "Reference to this cannot fail!"); 8846 8847 // Assign base classes. 8848 bool Invalid = false; 8849 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8850 E = ClassDecl->bases_end(); Base != E; ++Base) { 8851 // Form the assignment: 8852 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8853 QualType BaseType = Base->getType().getUnqualifiedType(); 8854 if (!BaseType->isRecordType()) { 8855 Invalid = true; 8856 continue; 8857 } 8858 8859 CXXCastPath BasePath; 8860 BasePath.push_back(Base); 8861 8862 // Construct the "from" expression, which is an implicit cast to the 8863 // appropriately-qualified base type. 8864 Expr *From = OtherRef; 8865 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8866 VK_XValue, &BasePath).take(); 8867 8868 // Dereference "this". 8869 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8870 8871 // Implicitly cast "this" to the appropriately-qualified base type. 8872 To = ImpCastExprToType(To.take(), 8873 Context.getCVRQualifiedType(BaseType, 8874 MoveAssignOperator->getTypeQualifiers()), 8875 CK_UncheckedDerivedToBase, 8876 VK_LValue, &BasePath); 8877 8878 // Build the move. 8879 StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType, 8880 To.get(), From, 8881 /*CopyingBaseSubobject=*/true, 8882 /*Copying=*/false); 8883 if (Move.isInvalid()) { 8884 Diag(CurrentLocation, diag::note_member_synthesized_at) 8885 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8886 MoveAssignOperator->setInvalidDecl(); 8887 return; 8888 } 8889 8890 // Success! Record the move. 8891 Statements.push_back(Move.takeAs<Expr>()); 8892 } 8893 8894 // Assign non-static members. 8895 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8896 FieldEnd = ClassDecl->field_end(); 8897 Field != FieldEnd; ++Field) { 8898 if (Field->isUnnamedBitfield()) 8899 continue; 8900 8901 // Check for members of reference type; we can't move those. 8902 if (Field->getType()->isReferenceType()) { 8903 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8904 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8905 Diag(Field->getLocation(), diag::note_declared_at); 8906 Diag(CurrentLocation, diag::note_member_synthesized_at) 8907 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8908 Invalid = true; 8909 continue; 8910 } 8911 8912 // Check for members of const-qualified, non-class type. 8913 QualType BaseType = Context.getBaseElementType(Field->getType()); 8914 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8915 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8916 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8917 Diag(Field->getLocation(), diag::note_declared_at); 8918 Diag(CurrentLocation, diag::note_member_synthesized_at) 8919 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8920 Invalid = true; 8921 continue; 8922 } 8923 8924 // Suppress assigning zero-width bitfields. 8925 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8926 continue; 8927 8928 QualType FieldType = Field->getType().getNonReferenceType(); 8929 if (FieldType->isIncompleteArrayType()) { 8930 assert(ClassDecl->hasFlexibleArrayMember() && 8931 "Incomplete array type is not valid"); 8932 continue; 8933 } 8934 8935 // Build references to the field in the object we're copying from and to. 8936 CXXScopeSpec SS; // Intentionally empty 8937 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8938 LookupMemberName); 8939 MemberLookup.addDecl(*Field); 8940 MemberLookup.resolveKind(); 8941 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8942 Loc, /*IsArrow=*/false, 8943 SS, SourceLocation(), 0, 8944 MemberLookup, 0); 8945 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8946 Loc, /*IsArrow=*/true, 8947 SS, SourceLocation(), 0, 8948 MemberLookup, 0); 8949 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8950 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8951 8952 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8953 "Member reference with rvalue base must be rvalue except for reference " 8954 "members, which aren't allowed for move assignment."); 8955 8956 // Build the move of this field. 8957 StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType, 8958 To.get(), From.get(), 8959 /*CopyingBaseSubobject=*/false, 8960 /*Copying=*/false); 8961 if (Move.isInvalid()) { 8962 Diag(CurrentLocation, diag::note_member_synthesized_at) 8963 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8964 MoveAssignOperator->setInvalidDecl(); 8965 return; 8966 } 8967 8968 // Success! Record the copy. 8969 Statements.push_back(Move.takeAs<Stmt>()); 8970 } 8971 8972 if (!Invalid) { 8973 // Add a "return *this;" 8974 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8975 8976 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8977 if (Return.isInvalid()) 8978 Invalid = true; 8979 else { 8980 Statements.push_back(Return.takeAs<Stmt>()); 8981 8982 if (Trap.hasErrorOccurred()) { 8983 Diag(CurrentLocation, diag::note_member_synthesized_at) 8984 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8985 Invalid = true; 8986 } 8987 } 8988 } 8989 8990 if (Invalid) { 8991 MoveAssignOperator->setInvalidDecl(); 8992 return; 8993 } 8994 8995 StmtResult Body; 8996 { 8997 CompoundScopeRAII CompoundScope(*this); 8998 Body = ActOnCompoundStmt(Loc, Loc, Statements, 8999 /*isStmtExpr=*/false); 9000 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 9001 } 9002 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 9003 9004 if (ASTMutationListener *L = getASTMutationListener()) { 9005 L->CompletedImplicitDefinition(MoveAssignOperator); 9006 } 9007} 9008 9009Sema::ImplicitExceptionSpecification 9010Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 9011 CXXRecordDecl *ClassDecl = MD->getParent(); 9012 9013 ImplicitExceptionSpecification ExceptSpec(*this); 9014 if (ClassDecl->isInvalidDecl()) 9015 return ExceptSpec; 9016 9017 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 9018 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 9019 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 9020 9021 // C++ [except.spec]p14: 9022 // An implicitly declared special member function (Clause 12) shall have an 9023 // exception-specification. [...] 9024 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9025 BaseEnd = ClassDecl->bases_end(); 9026 Base != BaseEnd; 9027 ++Base) { 9028 // Virtual bases are handled below. 9029 if (Base->isVirtual()) 9030 continue; 9031 9032 CXXRecordDecl *BaseClassDecl 9033 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9034 if (CXXConstructorDecl *CopyConstructor = 9035 LookupCopyingConstructor(BaseClassDecl, Quals)) 9036 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 9037 } 9038 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9039 BaseEnd = ClassDecl->vbases_end(); 9040 Base != BaseEnd; 9041 ++Base) { 9042 CXXRecordDecl *BaseClassDecl 9043 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9044 if (CXXConstructorDecl *CopyConstructor = 9045 LookupCopyingConstructor(BaseClassDecl, Quals)) 9046 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 9047 } 9048 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9049 FieldEnd = ClassDecl->field_end(); 9050 Field != FieldEnd; 9051 ++Field) { 9052 QualType FieldType = Context.getBaseElementType(Field->getType()); 9053 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 9054 if (CXXConstructorDecl *CopyConstructor = 9055 LookupCopyingConstructor(FieldClassDecl, 9056 Quals | FieldType.getCVRQualifiers())) 9057 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 9058 } 9059 } 9060 9061 return ExceptSpec; 9062} 9063 9064CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 9065 CXXRecordDecl *ClassDecl) { 9066 // C++ [class.copy]p4: 9067 // If the class definition does not explicitly declare a copy 9068 // constructor, one is declared implicitly. 9069 assert(ClassDecl->needsImplicitCopyConstructor()); 9070 9071 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyConstructor); 9072 if (DSM.isAlreadyBeingDeclared()) 9073 return 0; 9074 9075 QualType ClassType = Context.getTypeDeclType(ClassDecl); 9076 QualType ArgType = ClassType; 9077 bool Const = ClassDecl->implicitCopyConstructorHasConstParam(); 9078 if (Const) 9079 ArgType = ArgType.withConst(); 9080 ArgType = Context.getLValueReferenceType(ArgType); 9081 9082 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9083 CXXCopyConstructor, 9084 Const); 9085 9086 DeclarationName Name 9087 = Context.DeclarationNames.getCXXConstructorName( 9088 Context.getCanonicalType(ClassType)); 9089 SourceLocation ClassLoc = ClassDecl->getLocation(); 9090 DeclarationNameInfo NameInfo(Name, ClassLoc); 9091 9092 // An implicitly-declared copy constructor is an inline public 9093 // member of its class. 9094 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 9095 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 9096 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 9097 Constexpr); 9098 CopyConstructor->setAccess(AS_public); 9099 CopyConstructor->setDefaulted(); 9100 9101 // Build an exception specification pointing back at this member. 9102 FunctionProtoType::ExtProtoInfo EPI; 9103 EPI.ExceptionSpecType = EST_Unevaluated; 9104 EPI.ExceptionSpecDecl = CopyConstructor; 9105 CopyConstructor->setType( 9106 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 9107 9108 // Add the parameter to the constructor. 9109 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 9110 ClassLoc, ClassLoc, 9111 /*IdentifierInfo=*/0, 9112 ArgType, /*TInfo=*/0, 9113 SC_None, 9114 SC_None, 0); 9115 CopyConstructor->setParams(FromParam); 9116 9117 CopyConstructor->setTrivial( 9118 ClassDecl->needsOverloadResolutionForCopyConstructor() 9119 ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor) 9120 : ClassDecl->hasTrivialCopyConstructor()); 9121 9122 // C++11 [class.copy]p8: 9123 // ... If the class definition does not explicitly declare a copy 9124 // constructor, there is no user-declared move constructor, and there is no 9125 // user-declared move assignment operator, a copy constructor is implicitly 9126 // declared as defaulted. 9127 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 9128 CopyConstructor->setDeletedAsWritten(); 9129 9130 // Note that we have declared this constructor. 9131 ++ASTContext::NumImplicitCopyConstructorsDeclared; 9132 9133 if (Scope *S = getScopeForContext(ClassDecl)) 9134 PushOnScopeChains(CopyConstructor, S, false); 9135 ClassDecl->addDecl(CopyConstructor); 9136 9137 return CopyConstructor; 9138} 9139 9140void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 9141 CXXConstructorDecl *CopyConstructor) { 9142 assert((CopyConstructor->isDefaulted() && 9143 CopyConstructor->isCopyConstructor() && 9144 !CopyConstructor->doesThisDeclarationHaveABody() && 9145 !CopyConstructor->isDeleted()) && 9146 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 9147 9148 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 9149 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 9150 9151 SynthesizedFunctionScope Scope(*this, CopyConstructor); 9152 DiagnosticErrorTrap Trap(Diags); 9153 9154 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 9155 Trap.hasErrorOccurred()) { 9156 Diag(CurrentLocation, diag::note_member_synthesized_at) 9157 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 9158 CopyConstructor->setInvalidDecl(); 9159 } else { 9160 Sema::CompoundScopeRAII CompoundScope(*this); 9161 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 9162 CopyConstructor->getLocation(), 9163 MultiStmtArg(), 9164 /*isStmtExpr=*/false) 9165 .takeAs<Stmt>()); 9166 CopyConstructor->setImplicitlyDefined(true); 9167 } 9168 9169 CopyConstructor->setUsed(); 9170 if (ASTMutationListener *L = getASTMutationListener()) { 9171 L->CompletedImplicitDefinition(CopyConstructor); 9172 } 9173} 9174 9175Sema::ImplicitExceptionSpecification 9176Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 9177 CXXRecordDecl *ClassDecl = MD->getParent(); 9178 9179 // C++ [except.spec]p14: 9180 // An implicitly declared special member function (Clause 12) shall have an 9181 // exception-specification. [...] 9182 ImplicitExceptionSpecification ExceptSpec(*this); 9183 if (ClassDecl->isInvalidDecl()) 9184 return ExceptSpec; 9185 9186 // Direct base-class constructors. 9187 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 9188 BEnd = ClassDecl->bases_end(); 9189 B != BEnd; ++B) { 9190 if (B->isVirtual()) // Handled below. 9191 continue; 9192 9193 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 9194 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 9195 CXXConstructorDecl *Constructor = 9196 LookupMovingConstructor(BaseClassDecl, 0); 9197 // If this is a deleted function, add it anyway. This might be conformant 9198 // with the standard. This might not. I'm not sure. It might not matter. 9199 if (Constructor) 9200 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 9201 } 9202 } 9203 9204 // Virtual base-class constructors. 9205 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 9206 BEnd = ClassDecl->vbases_end(); 9207 B != BEnd; ++B) { 9208 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 9209 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 9210 CXXConstructorDecl *Constructor = 9211 LookupMovingConstructor(BaseClassDecl, 0); 9212 // If this is a deleted function, add it anyway. This might be conformant 9213 // with the standard. This might not. I'm not sure. It might not matter. 9214 if (Constructor) 9215 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 9216 } 9217 } 9218 9219 // Field constructors. 9220 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 9221 FEnd = ClassDecl->field_end(); 9222 F != FEnd; ++F) { 9223 QualType FieldType = Context.getBaseElementType(F->getType()); 9224 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 9225 CXXConstructorDecl *Constructor = 9226 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 9227 // If this is a deleted function, add it anyway. This might be conformant 9228 // with the standard. This might not. I'm not sure. It might not matter. 9229 // In particular, the problem is that this function never gets called. It 9230 // might just be ill-formed because this function attempts to refer to 9231 // a deleted function here. 9232 if (Constructor) 9233 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 9234 } 9235 } 9236 9237 return ExceptSpec; 9238} 9239 9240CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 9241 CXXRecordDecl *ClassDecl) { 9242 // C++11 [class.copy]p9: 9243 // If the definition of a class X does not explicitly declare a move 9244 // constructor, one will be implicitly declared as defaulted if and only if: 9245 // 9246 // - [first 4 bullets] 9247 assert(ClassDecl->needsImplicitMoveConstructor()); 9248 9249 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveConstructor); 9250 if (DSM.isAlreadyBeingDeclared()) 9251 return 0; 9252 9253 // [Checked after we build the declaration] 9254 // - the move assignment operator would not be implicitly defined as 9255 // deleted, 9256 9257 // [DR1402]: 9258 // - each of X's non-static data members and direct or virtual base classes 9259 // has a type that either has a move constructor or is trivially copyable. 9260 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 9261 ClassDecl->setFailedImplicitMoveConstructor(); 9262 return 0; 9263 } 9264 9265 QualType ClassType = Context.getTypeDeclType(ClassDecl); 9266 QualType ArgType = Context.getRValueReferenceType(ClassType); 9267 9268 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9269 CXXMoveConstructor, 9270 false); 9271 9272 DeclarationName Name 9273 = Context.DeclarationNames.getCXXConstructorName( 9274 Context.getCanonicalType(ClassType)); 9275 SourceLocation ClassLoc = ClassDecl->getLocation(); 9276 DeclarationNameInfo NameInfo(Name, ClassLoc); 9277 9278 // C++0x [class.copy]p11: 9279 // An implicitly-declared copy/move constructor is an inline public 9280 // member of its class. 9281 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 9282 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 9283 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 9284 Constexpr); 9285 MoveConstructor->setAccess(AS_public); 9286 MoveConstructor->setDefaulted(); 9287 9288 // Build an exception specification pointing back at this member. 9289 FunctionProtoType::ExtProtoInfo EPI; 9290 EPI.ExceptionSpecType = EST_Unevaluated; 9291 EPI.ExceptionSpecDecl = MoveConstructor; 9292 MoveConstructor->setType( 9293 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 9294 9295 // Add the parameter to the constructor. 9296 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 9297 ClassLoc, ClassLoc, 9298 /*IdentifierInfo=*/0, 9299 ArgType, /*TInfo=*/0, 9300 SC_None, 9301 SC_None, 0); 9302 MoveConstructor->setParams(FromParam); 9303 9304 MoveConstructor->setTrivial( 9305 ClassDecl->needsOverloadResolutionForMoveConstructor() 9306 ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor) 9307 : ClassDecl->hasTrivialMoveConstructor()); 9308 9309 // C++0x [class.copy]p9: 9310 // If the definition of a class X does not explicitly declare a move 9311 // constructor, one will be implicitly declared as defaulted if and only if: 9312 // [...] 9313 // - the move constructor would not be implicitly defined as deleted. 9314 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 9315 // Cache this result so that we don't try to generate this over and over 9316 // on every lookup, leaking memory and wasting time. 9317 ClassDecl->setFailedImplicitMoveConstructor(); 9318 return 0; 9319 } 9320 9321 // Note that we have declared this constructor. 9322 ++ASTContext::NumImplicitMoveConstructorsDeclared; 9323 9324 if (Scope *S = getScopeForContext(ClassDecl)) 9325 PushOnScopeChains(MoveConstructor, S, false); 9326 ClassDecl->addDecl(MoveConstructor); 9327 9328 return MoveConstructor; 9329} 9330 9331void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 9332 CXXConstructorDecl *MoveConstructor) { 9333 assert((MoveConstructor->isDefaulted() && 9334 MoveConstructor->isMoveConstructor() && 9335 !MoveConstructor->doesThisDeclarationHaveABody() && 9336 !MoveConstructor->isDeleted()) && 9337 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 9338 9339 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 9340 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 9341 9342 SynthesizedFunctionScope Scope(*this, MoveConstructor); 9343 DiagnosticErrorTrap Trap(Diags); 9344 9345 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 9346 Trap.hasErrorOccurred()) { 9347 Diag(CurrentLocation, diag::note_member_synthesized_at) 9348 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 9349 MoveConstructor->setInvalidDecl(); 9350 } else { 9351 Sema::CompoundScopeRAII CompoundScope(*this); 9352 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 9353 MoveConstructor->getLocation(), 9354 MultiStmtArg(), 9355 /*isStmtExpr=*/false) 9356 .takeAs<Stmt>()); 9357 MoveConstructor->setImplicitlyDefined(true); 9358 } 9359 9360 MoveConstructor->setUsed(); 9361 9362 if (ASTMutationListener *L = getASTMutationListener()) { 9363 L->CompletedImplicitDefinition(MoveConstructor); 9364 } 9365} 9366 9367bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 9368 return FD->isDeleted() && 9369 (FD->isDefaulted() || FD->isImplicit()) && 9370 isa<CXXMethodDecl>(FD); 9371} 9372 9373/// \brief Mark the call operator of the given lambda closure type as "used". 9374static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 9375 CXXMethodDecl *CallOperator 9376 = cast<CXXMethodDecl>( 9377 Lambda->lookup( 9378 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).front()); 9379 CallOperator->setReferenced(); 9380 CallOperator->setUsed(); 9381} 9382 9383void Sema::DefineImplicitLambdaToFunctionPointerConversion( 9384 SourceLocation CurrentLocation, 9385 CXXConversionDecl *Conv) 9386{ 9387 CXXRecordDecl *Lambda = Conv->getParent(); 9388 9389 // Make sure that the lambda call operator is marked used. 9390 markLambdaCallOperatorUsed(*this, Lambda); 9391 9392 Conv->setUsed(); 9393 9394 SynthesizedFunctionScope Scope(*this, Conv); 9395 DiagnosticErrorTrap Trap(Diags); 9396 9397 // Return the address of the __invoke function. 9398 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 9399 CXXMethodDecl *Invoke 9400 = cast<CXXMethodDecl>(Lambda->lookup(InvokeName).front()); 9401 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 9402 VK_LValue, Conv->getLocation()).take(); 9403 assert(FunctionRef && "Can't refer to __invoke function?"); 9404 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 9405 Conv->setBody(new (Context) CompoundStmt(Context, Return, 9406 Conv->getLocation(), 9407 Conv->getLocation())); 9408 9409 // Fill in the __invoke function with a dummy implementation. IR generation 9410 // will fill in the actual details. 9411 Invoke->setUsed(); 9412 Invoke->setReferenced(); 9413 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation())); 9414 9415 if (ASTMutationListener *L = getASTMutationListener()) { 9416 L->CompletedImplicitDefinition(Conv); 9417 L->CompletedImplicitDefinition(Invoke); 9418 } 9419} 9420 9421void Sema::DefineImplicitLambdaToBlockPointerConversion( 9422 SourceLocation CurrentLocation, 9423 CXXConversionDecl *Conv) 9424{ 9425 Conv->setUsed(); 9426 9427 SynthesizedFunctionScope Scope(*this, Conv); 9428 DiagnosticErrorTrap Trap(Diags); 9429 9430 // Copy-initialize the lambda object as needed to capture it. 9431 Expr *This = ActOnCXXThis(CurrentLocation).take(); 9432 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 9433 9434 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 9435 Conv->getLocation(), 9436 Conv, DerefThis); 9437 9438 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 9439 // behavior. Note that only the general conversion function does this 9440 // (since it's unusable otherwise); in the case where we inline the 9441 // block literal, it has block literal lifetime semantics. 9442 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 9443 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 9444 CK_CopyAndAutoreleaseBlockObject, 9445 BuildBlock.get(), 0, VK_RValue); 9446 9447 if (BuildBlock.isInvalid()) { 9448 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9449 Conv->setInvalidDecl(); 9450 return; 9451 } 9452 9453 // Create the return statement that returns the block from the conversion 9454 // function. 9455 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 9456 if (Return.isInvalid()) { 9457 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9458 Conv->setInvalidDecl(); 9459 return; 9460 } 9461 9462 // Set the body of the conversion function. 9463 Stmt *ReturnS = Return.take(); 9464 Conv->setBody(new (Context) CompoundStmt(Context, ReturnS, 9465 Conv->getLocation(), 9466 Conv->getLocation())); 9467 9468 // We're done; notify the mutation listener, if any. 9469 if (ASTMutationListener *L = getASTMutationListener()) { 9470 L->CompletedImplicitDefinition(Conv); 9471 } 9472} 9473 9474/// \brief Determine whether the given list arguments contains exactly one 9475/// "real" (non-default) argument. 9476static bool hasOneRealArgument(MultiExprArg Args) { 9477 switch (Args.size()) { 9478 case 0: 9479 return false; 9480 9481 default: 9482 if (!Args[1]->isDefaultArgument()) 9483 return false; 9484 9485 // fall through 9486 case 1: 9487 return !Args[0]->isDefaultArgument(); 9488 } 9489 9490 return false; 9491} 9492 9493ExprResult 9494Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9495 CXXConstructorDecl *Constructor, 9496 MultiExprArg ExprArgs, 9497 bool HadMultipleCandidates, 9498 bool IsListInitialization, 9499 bool RequiresZeroInit, 9500 unsigned ConstructKind, 9501 SourceRange ParenRange) { 9502 bool Elidable = false; 9503 9504 // C++0x [class.copy]p34: 9505 // When certain criteria are met, an implementation is allowed to 9506 // omit the copy/move construction of a class object, even if the 9507 // copy/move constructor and/or destructor for the object have 9508 // side effects. [...] 9509 // - when a temporary class object that has not been bound to a 9510 // reference (12.2) would be copied/moved to a class object 9511 // with the same cv-unqualified type, the copy/move operation 9512 // can be omitted by constructing the temporary object 9513 // directly into the target of the omitted copy/move 9514 if (ConstructKind == CXXConstructExpr::CK_Complete && 9515 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9516 Expr *SubExpr = ExprArgs[0]; 9517 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9518 } 9519 9520 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9521 Elidable, ExprArgs, HadMultipleCandidates, 9522 IsListInitialization, RequiresZeroInit, 9523 ConstructKind, ParenRange); 9524} 9525 9526/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9527/// including handling of its default argument expressions. 9528ExprResult 9529Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9530 CXXConstructorDecl *Constructor, bool Elidable, 9531 MultiExprArg ExprArgs, 9532 bool HadMultipleCandidates, 9533 bool IsListInitialization, 9534 bool RequiresZeroInit, 9535 unsigned ConstructKind, 9536 SourceRange ParenRange) { 9537 MarkFunctionReferenced(ConstructLoc, Constructor); 9538 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9539 Constructor, Elidable, ExprArgs, 9540 HadMultipleCandidates, 9541 IsListInitialization, RequiresZeroInit, 9542 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9543 ParenRange)); 9544} 9545 9546void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9547 if (VD->isInvalidDecl()) return; 9548 9549 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9550 if (ClassDecl->isInvalidDecl()) return; 9551 if (ClassDecl->hasIrrelevantDestructor()) return; 9552 if (ClassDecl->isDependentContext()) return; 9553 9554 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9555 MarkFunctionReferenced(VD->getLocation(), Destructor); 9556 CheckDestructorAccess(VD->getLocation(), Destructor, 9557 PDiag(diag::err_access_dtor_var) 9558 << VD->getDeclName() 9559 << VD->getType()); 9560 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9561 9562 if (!VD->hasGlobalStorage()) return; 9563 9564 // Emit warning for non-trivial dtor in global scope (a real global, 9565 // class-static, function-static). 9566 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9567 9568 // TODO: this should be re-enabled for static locals by !CXAAtExit 9569 if (!VD->isStaticLocal()) 9570 Diag(VD->getLocation(), diag::warn_global_destructor); 9571} 9572 9573/// \brief Given a constructor and the set of arguments provided for the 9574/// constructor, convert the arguments and add any required default arguments 9575/// to form a proper call to this constructor. 9576/// 9577/// \returns true if an error occurred, false otherwise. 9578bool 9579Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9580 MultiExprArg ArgsPtr, 9581 SourceLocation Loc, 9582 SmallVectorImpl<Expr*> &ConvertedArgs, 9583 bool AllowExplicit) { 9584 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9585 unsigned NumArgs = ArgsPtr.size(); 9586 Expr **Args = ArgsPtr.data(); 9587 9588 const FunctionProtoType *Proto 9589 = Constructor->getType()->getAs<FunctionProtoType>(); 9590 assert(Proto && "Constructor without a prototype?"); 9591 unsigned NumArgsInProto = Proto->getNumArgs(); 9592 9593 // If too few arguments are available, we'll fill in the rest with defaults. 9594 if (NumArgs < NumArgsInProto) 9595 ConvertedArgs.reserve(NumArgsInProto); 9596 else 9597 ConvertedArgs.reserve(NumArgs); 9598 9599 VariadicCallType CallType = 9600 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9601 SmallVector<Expr *, 8> AllArgs; 9602 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9603 Proto, 0, Args, NumArgs, AllArgs, 9604 CallType, AllowExplicit); 9605 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9606 9607 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9608 9609 CheckConstructorCall(Constructor, 9610 llvm::makeArrayRef<const Expr *>(AllArgs.data(), 9611 AllArgs.size()), 9612 Proto, Loc); 9613 9614 return Invalid; 9615} 9616 9617static inline bool 9618CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9619 const FunctionDecl *FnDecl) { 9620 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9621 if (isa<NamespaceDecl>(DC)) { 9622 return SemaRef.Diag(FnDecl->getLocation(), 9623 diag::err_operator_new_delete_declared_in_namespace) 9624 << FnDecl->getDeclName(); 9625 } 9626 9627 if (isa<TranslationUnitDecl>(DC) && 9628 FnDecl->getStorageClass() == SC_Static) { 9629 return SemaRef.Diag(FnDecl->getLocation(), 9630 diag::err_operator_new_delete_declared_static) 9631 << FnDecl->getDeclName(); 9632 } 9633 9634 return false; 9635} 9636 9637static inline bool 9638CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9639 CanQualType ExpectedResultType, 9640 CanQualType ExpectedFirstParamType, 9641 unsigned DependentParamTypeDiag, 9642 unsigned InvalidParamTypeDiag) { 9643 QualType ResultType = 9644 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9645 9646 // Check that the result type is not dependent. 9647 if (ResultType->isDependentType()) 9648 return SemaRef.Diag(FnDecl->getLocation(), 9649 diag::err_operator_new_delete_dependent_result_type) 9650 << FnDecl->getDeclName() << ExpectedResultType; 9651 9652 // Check that the result type is what we expect. 9653 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9654 return SemaRef.Diag(FnDecl->getLocation(), 9655 diag::err_operator_new_delete_invalid_result_type) 9656 << FnDecl->getDeclName() << ExpectedResultType; 9657 9658 // A function template must have at least 2 parameters. 9659 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9660 return SemaRef.Diag(FnDecl->getLocation(), 9661 diag::err_operator_new_delete_template_too_few_parameters) 9662 << FnDecl->getDeclName(); 9663 9664 // The function decl must have at least 1 parameter. 9665 if (FnDecl->getNumParams() == 0) 9666 return SemaRef.Diag(FnDecl->getLocation(), 9667 diag::err_operator_new_delete_too_few_parameters) 9668 << FnDecl->getDeclName(); 9669 9670 // Check the first parameter type is not dependent. 9671 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9672 if (FirstParamType->isDependentType()) 9673 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9674 << FnDecl->getDeclName() << ExpectedFirstParamType; 9675 9676 // Check that the first parameter type is what we expect. 9677 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9678 ExpectedFirstParamType) 9679 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9680 << FnDecl->getDeclName() << ExpectedFirstParamType; 9681 9682 return false; 9683} 9684 9685static bool 9686CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9687 // C++ [basic.stc.dynamic.allocation]p1: 9688 // A program is ill-formed if an allocation function is declared in a 9689 // namespace scope other than global scope or declared static in global 9690 // scope. 9691 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9692 return true; 9693 9694 CanQualType SizeTy = 9695 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9696 9697 // C++ [basic.stc.dynamic.allocation]p1: 9698 // The return type shall be void*. The first parameter shall have type 9699 // std::size_t. 9700 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9701 SizeTy, 9702 diag::err_operator_new_dependent_param_type, 9703 diag::err_operator_new_param_type)) 9704 return true; 9705 9706 // C++ [basic.stc.dynamic.allocation]p1: 9707 // The first parameter shall not have an associated default argument. 9708 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9709 return SemaRef.Diag(FnDecl->getLocation(), 9710 diag::err_operator_new_default_arg) 9711 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9712 9713 return false; 9714} 9715 9716static bool 9717CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) { 9718 // C++ [basic.stc.dynamic.deallocation]p1: 9719 // A program is ill-formed if deallocation functions are declared in a 9720 // namespace scope other than global scope or declared static in global 9721 // scope. 9722 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9723 return true; 9724 9725 // C++ [basic.stc.dynamic.deallocation]p2: 9726 // Each deallocation function shall return void and its first parameter 9727 // shall be void*. 9728 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9729 SemaRef.Context.VoidPtrTy, 9730 diag::err_operator_delete_dependent_param_type, 9731 diag::err_operator_delete_param_type)) 9732 return true; 9733 9734 return false; 9735} 9736 9737/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9738/// of this overloaded operator is well-formed. If so, returns false; 9739/// otherwise, emits appropriate diagnostics and returns true. 9740bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9741 assert(FnDecl && FnDecl->isOverloadedOperator() && 9742 "Expected an overloaded operator declaration"); 9743 9744 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9745 9746 // C++ [over.oper]p5: 9747 // The allocation and deallocation functions, operator new, 9748 // operator new[], operator delete and operator delete[], are 9749 // described completely in 3.7.3. The attributes and restrictions 9750 // found in the rest of this subclause do not apply to them unless 9751 // explicitly stated in 3.7.3. 9752 if (Op == OO_Delete || Op == OO_Array_Delete) 9753 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9754 9755 if (Op == OO_New || Op == OO_Array_New) 9756 return CheckOperatorNewDeclaration(*this, FnDecl); 9757 9758 // C++ [over.oper]p6: 9759 // An operator function shall either be a non-static member 9760 // function or be a non-member function and have at least one 9761 // parameter whose type is a class, a reference to a class, an 9762 // enumeration, or a reference to an enumeration. 9763 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9764 if (MethodDecl->isStatic()) 9765 return Diag(FnDecl->getLocation(), 9766 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9767 } else { 9768 bool ClassOrEnumParam = false; 9769 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9770 ParamEnd = FnDecl->param_end(); 9771 Param != ParamEnd; ++Param) { 9772 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9773 if (ParamType->isDependentType() || ParamType->isRecordType() || 9774 ParamType->isEnumeralType()) { 9775 ClassOrEnumParam = true; 9776 break; 9777 } 9778 } 9779 9780 if (!ClassOrEnumParam) 9781 return Diag(FnDecl->getLocation(), 9782 diag::err_operator_overload_needs_class_or_enum) 9783 << FnDecl->getDeclName(); 9784 } 9785 9786 // C++ [over.oper]p8: 9787 // An operator function cannot have default arguments (8.3.6), 9788 // except where explicitly stated below. 9789 // 9790 // Only the function-call operator allows default arguments 9791 // (C++ [over.call]p1). 9792 if (Op != OO_Call) { 9793 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9794 Param != FnDecl->param_end(); ++Param) { 9795 if ((*Param)->hasDefaultArg()) 9796 return Diag((*Param)->getLocation(), 9797 diag::err_operator_overload_default_arg) 9798 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9799 } 9800 } 9801 9802 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9803 { false, false, false } 9804#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9805 , { Unary, Binary, MemberOnly } 9806#include "clang/Basic/OperatorKinds.def" 9807 }; 9808 9809 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9810 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9811 bool MustBeMemberOperator = OperatorUses[Op][2]; 9812 9813 // C++ [over.oper]p8: 9814 // [...] Operator functions cannot have more or fewer parameters 9815 // than the number required for the corresponding operator, as 9816 // described in the rest of this subclause. 9817 unsigned NumParams = FnDecl->getNumParams() 9818 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9819 if (Op != OO_Call && 9820 ((NumParams == 1 && !CanBeUnaryOperator) || 9821 (NumParams == 2 && !CanBeBinaryOperator) || 9822 (NumParams < 1) || (NumParams > 2))) { 9823 // We have the wrong number of parameters. 9824 unsigned ErrorKind; 9825 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9826 ErrorKind = 2; // 2 -> unary or binary. 9827 } else if (CanBeUnaryOperator) { 9828 ErrorKind = 0; // 0 -> unary 9829 } else { 9830 assert(CanBeBinaryOperator && 9831 "All non-call overloaded operators are unary or binary!"); 9832 ErrorKind = 1; // 1 -> binary 9833 } 9834 9835 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9836 << FnDecl->getDeclName() << NumParams << ErrorKind; 9837 } 9838 9839 // Overloaded operators other than operator() cannot be variadic. 9840 if (Op != OO_Call && 9841 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9842 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9843 << FnDecl->getDeclName(); 9844 } 9845 9846 // Some operators must be non-static member functions. 9847 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9848 return Diag(FnDecl->getLocation(), 9849 diag::err_operator_overload_must_be_member) 9850 << FnDecl->getDeclName(); 9851 } 9852 9853 // C++ [over.inc]p1: 9854 // The user-defined function called operator++ implements the 9855 // prefix and postfix ++ operator. If this function is a member 9856 // function with no parameters, or a non-member function with one 9857 // parameter of class or enumeration type, it defines the prefix 9858 // increment operator ++ for objects of that type. If the function 9859 // is a member function with one parameter (which shall be of type 9860 // int) or a non-member function with two parameters (the second 9861 // of which shall be of type int), it defines the postfix 9862 // increment operator ++ for objects of that type. 9863 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9864 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9865 bool ParamIsInt = false; 9866 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9867 ParamIsInt = BT->getKind() == BuiltinType::Int; 9868 9869 if (!ParamIsInt) 9870 return Diag(LastParam->getLocation(), 9871 diag::err_operator_overload_post_incdec_must_be_int) 9872 << LastParam->getType() << (Op == OO_MinusMinus); 9873 } 9874 9875 return false; 9876} 9877 9878/// CheckLiteralOperatorDeclaration - Check whether the declaration 9879/// of this literal operator function is well-formed. If so, returns 9880/// false; otherwise, emits appropriate diagnostics and returns true. 9881bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9882 if (isa<CXXMethodDecl>(FnDecl)) { 9883 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9884 << FnDecl->getDeclName(); 9885 return true; 9886 } 9887 9888 if (FnDecl->isExternC()) { 9889 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 9890 return true; 9891 } 9892 9893 bool Valid = false; 9894 9895 // This might be the definition of a literal operator template. 9896 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 9897 // This might be a specialization of a literal operator template. 9898 if (!TpDecl) 9899 TpDecl = FnDecl->getPrimaryTemplate(); 9900 9901 // template <char...> type operator "" name() is the only valid template 9902 // signature, and the only valid signature with no parameters. 9903 if (TpDecl) { 9904 if (FnDecl->param_size() == 0) { 9905 // Must have only one template parameter 9906 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9907 if (Params->size() == 1) { 9908 NonTypeTemplateParmDecl *PmDecl = 9909 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9910 9911 // The template parameter must be a char parameter pack. 9912 if (PmDecl && PmDecl->isTemplateParameterPack() && 9913 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9914 Valid = true; 9915 } 9916 } 9917 } else if (FnDecl->param_size()) { 9918 // Check the first parameter 9919 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9920 9921 QualType T = (*Param)->getType().getUnqualifiedType(); 9922 9923 // unsigned long long int, long double, and any character type are allowed 9924 // as the only parameters. 9925 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9926 Context.hasSameType(T, Context.LongDoubleTy) || 9927 Context.hasSameType(T, Context.CharTy) || 9928 Context.hasSameType(T, Context.WCharTy) || 9929 Context.hasSameType(T, Context.Char16Ty) || 9930 Context.hasSameType(T, Context.Char32Ty)) { 9931 if (++Param == FnDecl->param_end()) 9932 Valid = true; 9933 goto FinishedParams; 9934 } 9935 9936 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9937 const PointerType *PT = T->getAs<PointerType>(); 9938 if (!PT) 9939 goto FinishedParams; 9940 T = PT->getPointeeType(); 9941 if (!T.isConstQualified() || T.isVolatileQualified()) 9942 goto FinishedParams; 9943 T = T.getUnqualifiedType(); 9944 9945 // Move on to the second parameter; 9946 ++Param; 9947 9948 // If there is no second parameter, the first must be a const char * 9949 if (Param == FnDecl->param_end()) { 9950 if (Context.hasSameType(T, Context.CharTy)) 9951 Valid = true; 9952 goto FinishedParams; 9953 } 9954 9955 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9956 // are allowed as the first parameter to a two-parameter function 9957 if (!(Context.hasSameType(T, Context.CharTy) || 9958 Context.hasSameType(T, Context.WCharTy) || 9959 Context.hasSameType(T, Context.Char16Ty) || 9960 Context.hasSameType(T, Context.Char32Ty))) 9961 goto FinishedParams; 9962 9963 // The second and final parameter must be an std::size_t 9964 T = (*Param)->getType().getUnqualifiedType(); 9965 if (Context.hasSameType(T, Context.getSizeType()) && 9966 ++Param == FnDecl->param_end()) 9967 Valid = true; 9968 } 9969 9970 // FIXME: This diagnostic is absolutely terrible. 9971FinishedParams: 9972 if (!Valid) { 9973 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9974 << FnDecl->getDeclName(); 9975 return true; 9976 } 9977 9978 // A parameter-declaration-clause containing a default argument is not 9979 // equivalent to any of the permitted forms. 9980 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9981 ParamEnd = FnDecl->param_end(); 9982 Param != ParamEnd; ++Param) { 9983 if ((*Param)->hasDefaultArg()) { 9984 Diag((*Param)->getDefaultArgRange().getBegin(), 9985 diag::err_literal_operator_default_argument) 9986 << (*Param)->getDefaultArgRange(); 9987 break; 9988 } 9989 } 9990 9991 StringRef LiteralName 9992 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9993 if (LiteralName[0] != '_') { 9994 // C++11 [usrlit.suffix]p1: 9995 // Literal suffix identifiers that do not start with an underscore 9996 // are reserved for future standardization. 9997 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9998 } 9999 10000 return false; 10001} 10002 10003/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 10004/// linkage specification, including the language and (if present) 10005/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 10006/// the location of the language string literal, which is provided 10007/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 10008/// the '{' brace. Otherwise, this linkage specification does not 10009/// have any braces. 10010Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 10011 SourceLocation LangLoc, 10012 StringRef Lang, 10013 SourceLocation LBraceLoc) { 10014 LinkageSpecDecl::LanguageIDs Language; 10015 if (Lang == "\"C\"") 10016 Language = LinkageSpecDecl::lang_c; 10017 else if (Lang == "\"C++\"") 10018 Language = LinkageSpecDecl::lang_cxx; 10019 else { 10020 Diag(LangLoc, diag::err_bad_language); 10021 return 0; 10022 } 10023 10024 // FIXME: Add all the various semantics of linkage specifications 10025 10026 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 10027 ExternLoc, LangLoc, Language); 10028 CurContext->addDecl(D); 10029 PushDeclContext(S, D); 10030 return D; 10031} 10032 10033/// ActOnFinishLinkageSpecification - Complete the definition of 10034/// the C++ linkage specification LinkageSpec. If RBraceLoc is 10035/// valid, it's the position of the closing '}' brace in a linkage 10036/// specification that uses braces. 10037Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 10038 Decl *LinkageSpec, 10039 SourceLocation RBraceLoc) { 10040 if (LinkageSpec) { 10041 if (RBraceLoc.isValid()) { 10042 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 10043 LSDecl->setRBraceLoc(RBraceLoc); 10044 } 10045 PopDeclContext(); 10046 } 10047 return LinkageSpec; 10048} 10049 10050/// \brief Perform semantic analysis for the variable declaration that 10051/// occurs within a C++ catch clause, returning the newly-created 10052/// variable. 10053VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 10054 TypeSourceInfo *TInfo, 10055 SourceLocation StartLoc, 10056 SourceLocation Loc, 10057 IdentifierInfo *Name) { 10058 bool Invalid = false; 10059 QualType ExDeclType = TInfo->getType(); 10060 10061 // Arrays and functions decay. 10062 if (ExDeclType->isArrayType()) 10063 ExDeclType = Context.getArrayDecayedType(ExDeclType); 10064 else if (ExDeclType->isFunctionType()) 10065 ExDeclType = Context.getPointerType(ExDeclType); 10066 10067 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 10068 // The exception-declaration shall not denote a pointer or reference to an 10069 // incomplete type, other than [cv] void*. 10070 // N2844 forbids rvalue references. 10071 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 10072 Diag(Loc, diag::err_catch_rvalue_ref); 10073 Invalid = true; 10074 } 10075 10076 QualType BaseType = ExDeclType; 10077 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 10078 unsigned DK = diag::err_catch_incomplete; 10079 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 10080 BaseType = Ptr->getPointeeType(); 10081 Mode = 1; 10082 DK = diag::err_catch_incomplete_ptr; 10083 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 10084 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 10085 BaseType = Ref->getPointeeType(); 10086 Mode = 2; 10087 DK = diag::err_catch_incomplete_ref; 10088 } 10089 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 10090 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 10091 Invalid = true; 10092 10093 if (!Invalid && !ExDeclType->isDependentType() && 10094 RequireNonAbstractType(Loc, ExDeclType, 10095 diag::err_abstract_type_in_decl, 10096 AbstractVariableType)) 10097 Invalid = true; 10098 10099 // Only the non-fragile NeXT runtime currently supports C++ catches 10100 // of ObjC types, and no runtime supports catching ObjC types by value. 10101 if (!Invalid && getLangOpts().ObjC1) { 10102 QualType T = ExDeclType; 10103 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 10104 T = RT->getPointeeType(); 10105 10106 if (T->isObjCObjectType()) { 10107 Diag(Loc, diag::err_objc_object_catch); 10108 Invalid = true; 10109 } else if (T->isObjCObjectPointerType()) { 10110 // FIXME: should this be a test for macosx-fragile specifically? 10111 if (getLangOpts().ObjCRuntime.isFragile()) 10112 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 10113 } 10114 } 10115 10116 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 10117 ExDeclType, TInfo, SC_None, SC_None); 10118 ExDecl->setExceptionVariable(true); 10119 10120 // In ARC, infer 'retaining' for variables of retainable type. 10121 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 10122 Invalid = true; 10123 10124 if (!Invalid && !ExDeclType->isDependentType()) { 10125 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 10126 // C++ [except.handle]p16: 10127 // The object declared in an exception-declaration or, if the 10128 // exception-declaration does not specify a name, a temporary (12.2) is 10129 // copy-initialized (8.5) from the exception object. [...] 10130 // The object is destroyed when the handler exits, after the destruction 10131 // of any automatic objects initialized within the handler. 10132 // 10133 // We just pretend to initialize the object with itself, then make sure 10134 // it can be destroyed later. 10135 QualType initType = ExDeclType; 10136 10137 InitializedEntity entity = 10138 InitializedEntity::InitializeVariable(ExDecl); 10139 InitializationKind initKind = 10140 InitializationKind::CreateCopy(Loc, SourceLocation()); 10141 10142 Expr *opaqueValue = 10143 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 10144 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 10145 ExprResult result = sequence.Perform(*this, entity, initKind, 10146 MultiExprArg(&opaqueValue, 1)); 10147 if (result.isInvalid()) 10148 Invalid = true; 10149 else { 10150 // If the constructor used was non-trivial, set this as the 10151 // "initializer". 10152 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 10153 if (!construct->getConstructor()->isTrivial()) { 10154 Expr *init = MaybeCreateExprWithCleanups(construct); 10155 ExDecl->setInit(init); 10156 } 10157 10158 // And make sure it's destructable. 10159 FinalizeVarWithDestructor(ExDecl, recordType); 10160 } 10161 } 10162 } 10163 10164 if (Invalid) 10165 ExDecl->setInvalidDecl(); 10166 10167 return ExDecl; 10168} 10169 10170/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 10171/// handler. 10172Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 10173 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10174 bool Invalid = D.isInvalidType(); 10175 10176 // Check for unexpanded parameter packs. 10177 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 10178 UPPC_ExceptionType)) { 10179 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 10180 D.getIdentifierLoc()); 10181 Invalid = true; 10182 } 10183 10184 IdentifierInfo *II = D.getIdentifier(); 10185 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 10186 LookupOrdinaryName, 10187 ForRedeclaration)) { 10188 // The scope should be freshly made just for us. There is just no way 10189 // it contains any previous declaration. 10190 assert(!S->isDeclScope(PrevDecl)); 10191 if (PrevDecl->isTemplateParameter()) { 10192 // Maybe we will complain about the shadowed template parameter. 10193 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 10194 PrevDecl = 0; 10195 } 10196 } 10197 10198 if (D.getCXXScopeSpec().isSet() && !Invalid) { 10199 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 10200 << D.getCXXScopeSpec().getRange(); 10201 Invalid = true; 10202 } 10203 10204 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 10205 D.getLocStart(), 10206 D.getIdentifierLoc(), 10207 D.getIdentifier()); 10208 if (Invalid) 10209 ExDecl->setInvalidDecl(); 10210 10211 // Add the exception declaration into this scope. 10212 if (II) 10213 PushOnScopeChains(ExDecl, S); 10214 else 10215 CurContext->addDecl(ExDecl); 10216 10217 ProcessDeclAttributes(S, ExDecl, D); 10218 return ExDecl; 10219} 10220 10221Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 10222 Expr *AssertExpr, 10223 Expr *AssertMessageExpr, 10224 SourceLocation RParenLoc) { 10225 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 10226 10227 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 10228 return 0; 10229 10230 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 10231 AssertMessage, RParenLoc, false); 10232} 10233 10234Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 10235 Expr *AssertExpr, 10236 StringLiteral *AssertMessage, 10237 SourceLocation RParenLoc, 10238 bool Failed) { 10239 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 10240 !Failed) { 10241 // In a static_assert-declaration, the constant-expression shall be a 10242 // constant expression that can be contextually converted to bool. 10243 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 10244 if (Converted.isInvalid()) 10245 Failed = true; 10246 10247 llvm::APSInt Cond; 10248 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 10249 diag::err_static_assert_expression_is_not_constant, 10250 /*AllowFold=*/false).isInvalid()) 10251 Failed = true; 10252 10253 if (!Failed && !Cond) { 10254 SmallString<256> MsgBuffer; 10255 llvm::raw_svector_ostream Msg(MsgBuffer); 10256 AssertMessage->printPretty(Msg, 0, getPrintingPolicy()); 10257 Diag(StaticAssertLoc, diag::err_static_assert_failed) 10258 << Msg.str() << AssertExpr->getSourceRange(); 10259 Failed = true; 10260 } 10261 } 10262 10263 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 10264 AssertExpr, AssertMessage, RParenLoc, 10265 Failed); 10266 10267 CurContext->addDecl(Decl); 10268 return Decl; 10269} 10270 10271/// \brief Perform semantic analysis of the given friend type declaration. 10272/// 10273/// \returns A friend declaration that. 10274FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart, 10275 SourceLocation FriendLoc, 10276 TypeSourceInfo *TSInfo) { 10277 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 10278 10279 QualType T = TSInfo->getType(); 10280 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 10281 10282 // C++03 [class.friend]p2: 10283 // An elaborated-type-specifier shall be used in a friend declaration 10284 // for a class.* 10285 // 10286 // * The class-key of the elaborated-type-specifier is required. 10287 if (!ActiveTemplateInstantiations.empty()) { 10288 // Do not complain about the form of friend template types during 10289 // template instantiation; we will already have complained when the 10290 // template was declared. 10291 } else if (!T->isElaboratedTypeSpecifier()) { 10292 // If we evaluated the type to a record type, suggest putting 10293 // a tag in front. 10294 if (const RecordType *RT = T->getAs<RecordType>()) { 10295 RecordDecl *RD = RT->getDecl(); 10296 10297 std::string InsertionText = std::string(" ") + RD->getKindName(); 10298 10299 Diag(TypeRange.getBegin(), 10300 getLangOpts().CPlusPlus11 ? 10301 diag::warn_cxx98_compat_unelaborated_friend_type : 10302 diag::ext_unelaborated_friend_type) 10303 << (unsigned) RD->getTagKind() 10304 << T 10305 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 10306 InsertionText); 10307 } else { 10308 Diag(FriendLoc, 10309 getLangOpts().CPlusPlus11 ? 10310 diag::warn_cxx98_compat_nonclass_type_friend : 10311 diag::ext_nonclass_type_friend) 10312 << T 10313 << TypeRange; 10314 } 10315 } else if (T->getAs<EnumType>()) { 10316 Diag(FriendLoc, 10317 getLangOpts().CPlusPlus11 ? 10318 diag::warn_cxx98_compat_enum_friend : 10319 diag::ext_enum_friend) 10320 << T 10321 << TypeRange; 10322 } 10323 10324 // C++11 [class.friend]p3: 10325 // A friend declaration that does not declare a function shall have one 10326 // of the following forms: 10327 // friend elaborated-type-specifier ; 10328 // friend simple-type-specifier ; 10329 // friend typename-specifier ; 10330 if (getLangOpts().CPlusPlus11 && LocStart != FriendLoc) 10331 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T; 10332 10333 // If the type specifier in a friend declaration designates a (possibly 10334 // cv-qualified) class type, that class is declared as a friend; otherwise, 10335 // the friend declaration is ignored. 10336 return FriendDecl::Create(Context, CurContext, LocStart, TSInfo, FriendLoc); 10337} 10338 10339/// Handle a friend tag declaration where the scope specifier was 10340/// templated. 10341Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 10342 unsigned TagSpec, SourceLocation TagLoc, 10343 CXXScopeSpec &SS, 10344 IdentifierInfo *Name, SourceLocation NameLoc, 10345 AttributeList *Attr, 10346 MultiTemplateParamsArg TempParamLists) { 10347 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 10348 10349 bool isExplicitSpecialization = false; 10350 bool Invalid = false; 10351 10352 if (TemplateParameterList *TemplateParams 10353 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 10354 TempParamLists.data(), 10355 TempParamLists.size(), 10356 /*friend*/ true, 10357 isExplicitSpecialization, 10358 Invalid)) { 10359 if (TemplateParams->size() > 0) { 10360 // This is a declaration of a class template. 10361 if (Invalid) 10362 return 0; 10363 10364 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 10365 SS, Name, NameLoc, Attr, 10366 TemplateParams, AS_public, 10367 /*ModulePrivateLoc=*/SourceLocation(), 10368 TempParamLists.size() - 1, 10369 TempParamLists.data()).take(); 10370 } else { 10371 // The "template<>" header is extraneous. 10372 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 10373 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 10374 isExplicitSpecialization = true; 10375 } 10376 } 10377 10378 if (Invalid) return 0; 10379 10380 bool isAllExplicitSpecializations = true; 10381 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 10382 if (TempParamLists[I]->size()) { 10383 isAllExplicitSpecializations = false; 10384 break; 10385 } 10386 } 10387 10388 // FIXME: don't ignore attributes. 10389 10390 // If it's explicit specializations all the way down, just forget 10391 // about the template header and build an appropriate non-templated 10392 // friend. TODO: for source fidelity, remember the headers. 10393 if (isAllExplicitSpecializations) { 10394 if (SS.isEmpty()) { 10395 bool Owned = false; 10396 bool IsDependent = false; 10397 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 10398 Attr, AS_public, 10399 /*ModulePrivateLoc=*/SourceLocation(), 10400 MultiTemplateParamsArg(), Owned, IsDependent, 10401 /*ScopedEnumKWLoc=*/SourceLocation(), 10402 /*ScopedEnumUsesClassTag=*/false, 10403 /*UnderlyingType=*/TypeResult()); 10404 } 10405 10406 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 10407 ElaboratedTypeKeyword Keyword 10408 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10409 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 10410 *Name, NameLoc); 10411 if (T.isNull()) 10412 return 0; 10413 10414 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10415 if (isa<DependentNameType>(T)) { 10416 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10417 TL.setElaboratedKeywordLoc(TagLoc); 10418 TL.setQualifierLoc(QualifierLoc); 10419 TL.setNameLoc(NameLoc); 10420 } else { 10421 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 10422 TL.setElaboratedKeywordLoc(TagLoc); 10423 TL.setQualifierLoc(QualifierLoc); 10424 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 10425 } 10426 10427 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10428 TSI, FriendLoc); 10429 Friend->setAccess(AS_public); 10430 CurContext->addDecl(Friend); 10431 return Friend; 10432 } 10433 10434 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 10435 10436 10437 10438 // Handle the case of a templated-scope friend class. e.g. 10439 // template <class T> class A<T>::B; 10440 // FIXME: we don't support these right now. 10441 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10442 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10443 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10444 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10445 TL.setElaboratedKeywordLoc(TagLoc); 10446 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10447 TL.setNameLoc(NameLoc); 10448 10449 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10450 TSI, FriendLoc); 10451 Friend->setAccess(AS_public); 10452 Friend->setUnsupportedFriend(true); 10453 CurContext->addDecl(Friend); 10454 return Friend; 10455} 10456 10457 10458/// Handle a friend type declaration. This works in tandem with 10459/// ActOnTag. 10460/// 10461/// Notes on friend class templates: 10462/// 10463/// We generally treat friend class declarations as if they were 10464/// declaring a class. So, for example, the elaborated type specifier 10465/// in a friend declaration is required to obey the restrictions of a 10466/// class-head (i.e. no typedefs in the scope chain), template 10467/// parameters are required to match up with simple template-ids, &c. 10468/// However, unlike when declaring a template specialization, it's 10469/// okay to refer to a template specialization without an empty 10470/// template parameter declaration, e.g. 10471/// friend class A<T>::B<unsigned>; 10472/// We permit this as a special case; if there are any template 10473/// parameters present at all, require proper matching, i.e. 10474/// template <> template \<class T> friend class A<int>::B; 10475Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10476 MultiTemplateParamsArg TempParams) { 10477 SourceLocation Loc = DS.getLocStart(); 10478 10479 assert(DS.isFriendSpecified()); 10480 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10481 10482 // Try to convert the decl specifier to a type. This works for 10483 // friend templates because ActOnTag never produces a ClassTemplateDecl 10484 // for a TUK_Friend. 10485 Declarator TheDeclarator(DS, Declarator::MemberContext); 10486 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10487 QualType T = TSI->getType(); 10488 if (TheDeclarator.isInvalidType()) 10489 return 0; 10490 10491 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10492 return 0; 10493 10494 // This is definitely an error in C++98. It's probably meant to 10495 // be forbidden in C++0x, too, but the specification is just 10496 // poorly written. 10497 // 10498 // The problem is with declarations like the following: 10499 // template <T> friend A<T>::foo; 10500 // where deciding whether a class C is a friend or not now hinges 10501 // on whether there exists an instantiation of A that causes 10502 // 'foo' to equal C. There are restrictions on class-heads 10503 // (which we declare (by fiat) elaborated friend declarations to 10504 // be) that makes this tractable. 10505 // 10506 // FIXME: handle "template <> friend class A<T>;", which 10507 // is possibly well-formed? Who even knows? 10508 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10509 Diag(Loc, diag::err_tagless_friend_type_template) 10510 << DS.getSourceRange(); 10511 return 0; 10512 } 10513 10514 // C++98 [class.friend]p1: A friend of a class is a function 10515 // or class that is not a member of the class . . . 10516 // This is fixed in DR77, which just barely didn't make the C++03 10517 // deadline. It's also a very silly restriction that seriously 10518 // affects inner classes and which nobody else seems to implement; 10519 // thus we never diagnose it, not even in -pedantic. 10520 // 10521 // But note that we could warn about it: it's always useless to 10522 // friend one of your own members (it's not, however, worthless to 10523 // friend a member of an arbitrary specialization of your template). 10524 10525 Decl *D; 10526 if (unsigned NumTempParamLists = TempParams.size()) 10527 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10528 NumTempParamLists, 10529 TempParams.data(), 10530 TSI, 10531 DS.getFriendSpecLoc()); 10532 else 10533 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10534 10535 if (!D) 10536 return 0; 10537 10538 D->setAccess(AS_public); 10539 CurContext->addDecl(D); 10540 10541 return D; 10542} 10543 10544NamedDecl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10545 MultiTemplateParamsArg TemplateParams) { 10546 const DeclSpec &DS = D.getDeclSpec(); 10547 10548 assert(DS.isFriendSpecified()); 10549 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10550 10551 SourceLocation Loc = D.getIdentifierLoc(); 10552 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10553 10554 // C++ [class.friend]p1 10555 // A friend of a class is a function or class.... 10556 // Note that this sees through typedefs, which is intended. 10557 // It *doesn't* see through dependent types, which is correct 10558 // according to [temp.arg.type]p3: 10559 // If a declaration acquires a function type through a 10560 // type dependent on a template-parameter and this causes 10561 // a declaration that does not use the syntactic form of a 10562 // function declarator to have a function type, the program 10563 // is ill-formed. 10564 if (!TInfo->getType()->isFunctionType()) { 10565 Diag(Loc, diag::err_unexpected_friend); 10566 10567 // It might be worthwhile to try to recover by creating an 10568 // appropriate declaration. 10569 return 0; 10570 } 10571 10572 // C++ [namespace.memdef]p3 10573 // - If a friend declaration in a non-local class first declares a 10574 // class or function, the friend class or function is a member 10575 // of the innermost enclosing namespace. 10576 // - The name of the friend is not found by simple name lookup 10577 // until a matching declaration is provided in that namespace 10578 // scope (either before or after the class declaration granting 10579 // friendship). 10580 // - If a friend function is called, its name may be found by the 10581 // name lookup that considers functions from namespaces and 10582 // classes associated with the types of the function arguments. 10583 // - When looking for a prior declaration of a class or a function 10584 // declared as a friend, scopes outside the innermost enclosing 10585 // namespace scope are not considered. 10586 10587 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10588 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10589 DeclarationName Name = NameInfo.getName(); 10590 assert(Name); 10591 10592 // Check for unexpanded parameter packs. 10593 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10594 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10595 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10596 return 0; 10597 10598 // The context we found the declaration in, or in which we should 10599 // create the declaration. 10600 DeclContext *DC; 10601 Scope *DCScope = S; 10602 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10603 ForRedeclaration); 10604 10605 // FIXME: there are different rules in local classes 10606 10607 // There are four cases here. 10608 // - There's no scope specifier, in which case we just go to the 10609 // appropriate scope and look for a function or function template 10610 // there as appropriate. 10611 // Recover from invalid scope qualifiers as if they just weren't there. 10612 if (SS.isInvalid() || !SS.isSet()) { 10613 // C++0x [namespace.memdef]p3: 10614 // If the name in a friend declaration is neither qualified nor 10615 // a template-id and the declaration is a function or an 10616 // elaborated-type-specifier, the lookup to determine whether 10617 // the entity has been previously declared shall not consider 10618 // any scopes outside the innermost enclosing namespace. 10619 // C++0x [class.friend]p11: 10620 // If a friend declaration appears in a local class and the name 10621 // specified is an unqualified name, a prior declaration is 10622 // looked up without considering scopes that are outside the 10623 // innermost enclosing non-class scope. For a friend function 10624 // declaration, if there is no prior declaration, the program is 10625 // ill-formed. 10626 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10627 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10628 10629 // Find the appropriate context according to the above. 10630 DC = CurContext; 10631 while (true) { 10632 // Skip class contexts. If someone can cite chapter and verse 10633 // for this behavior, that would be nice --- it's what GCC and 10634 // EDG do, and it seems like a reasonable intent, but the spec 10635 // really only says that checks for unqualified existing 10636 // declarations should stop at the nearest enclosing namespace, 10637 // not that they should only consider the nearest enclosing 10638 // namespace. 10639 while (DC->isRecord() || DC->isTransparentContext()) 10640 DC = DC->getParent(); 10641 10642 LookupQualifiedName(Previous, DC); 10643 10644 // TODO: decide what we think about using declarations. 10645 if (isLocal || !Previous.empty()) 10646 break; 10647 10648 if (isTemplateId) { 10649 if (isa<TranslationUnitDecl>(DC)) break; 10650 } else { 10651 if (DC->isFileContext()) break; 10652 } 10653 DC = DC->getParent(); 10654 } 10655 10656 // C++ [class.friend]p1: A friend of a class is a function or 10657 // class that is not a member of the class . . . 10658 // C++11 changes this for both friend types and functions. 10659 // Most C++ 98 compilers do seem to give an error here, so 10660 // we do, too. 10661 if (!Previous.empty() && DC->Equals(CurContext)) 10662 Diag(DS.getFriendSpecLoc(), 10663 getLangOpts().CPlusPlus11 ? 10664 diag::warn_cxx98_compat_friend_is_member : 10665 diag::err_friend_is_member); 10666 10667 DCScope = getScopeForDeclContext(S, DC); 10668 10669 // C++ [class.friend]p6: 10670 // A function can be defined in a friend declaration of a class if and 10671 // only if the class is a non-local class (9.8), the function name is 10672 // unqualified, and the function has namespace scope. 10673 if (isLocal && D.isFunctionDefinition()) { 10674 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10675 } 10676 10677 // - There's a non-dependent scope specifier, in which case we 10678 // compute it and do a previous lookup there for a function 10679 // or function template. 10680 } else if (!SS.getScopeRep()->isDependent()) { 10681 DC = computeDeclContext(SS); 10682 if (!DC) return 0; 10683 10684 if (RequireCompleteDeclContext(SS, DC)) return 0; 10685 10686 LookupQualifiedName(Previous, DC); 10687 10688 // Ignore things found implicitly in the wrong scope. 10689 // TODO: better diagnostics for this case. Suggesting the right 10690 // qualified scope would be nice... 10691 LookupResult::Filter F = Previous.makeFilter(); 10692 while (F.hasNext()) { 10693 NamedDecl *D = F.next(); 10694 if (!DC->InEnclosingNamespaceSetOf( 10695 D->getDeclContext()->getRedeclContext())) 10696 F.erase(); 10697 } 10698 F.done(); 10699 10700 if (Previous.empty()) { 10701 D.setInvalidType(); 10702 Diag(Loc, diag::err_qualified_friend_not_found) 10703 << Name << TInfo->getType(); 10704 return 0; 10705 } 10706 10707 // C++ [class.friend]p1: A friend of a class is a function or 10708 // class that is not a member of the class . . . 10709 if (DC->Equals(CurContext)) 10710 Diag(DS.getFriendSpecLoc(), 10711 getLangOpts().CPlusPlus11 ? 10712 diag::warn_cxx98_compat_friend_is_member : 10713 diag::err_friend_is_member); 10714 10715 if (D.isFunctionDefinition()) { 10716 // C++ [class.friend]p6: 10717 // A function can be defined in a friend declaration of a class if and 10718 // only if the class is a non-local class (9.8), the function name is 10719 // unqualified, and the function has namespace scope. 10720 SemaDiagnosticBuilder DB 10721 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10722 10723 DB << SS.getScopeRep(); 10724 if (DC->isFileContext()) 10725 DB << FixItHint::CreateRemoval(SS.getRange()); 10726 SS.clear(); 10727 } 10728 10729 // - There's a scope specifier that does not match any template 10730 // parameter lists, in which case we use some arbitrary context, 10731 // create a method or method template, and wait for instantiation. 10732 // - There's a scope specifier that does match some template 10733 // parameter lists, which we don't handle right now. 10734 } else { 10735 if (D.isFunctionDefinition()) { 10736 // C++ [class.friend]p6: 10737 // A function can be defined in a friend declaration of a class if and 10738 // only if the class is a non-local class (9.8), the function name is 10739 // unqualified, and the function has namespace scope. 10740 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10741 << SS.getScopeRep(); 10742 } 10743 10744 DC = CurContext; 10745 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10746 } 10747 10748 if (!DC->isRecord()) { 10749 // This implies that it has to be an operator or function. 10750 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10751 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10752 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10753 Diag(Loc, diag::err_introducing_special_friend) << 10754 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10755 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10756 return 0; 10757 } 10758 } 10759 10760 // FIXME: This is an egregious hack to cope with cases where the scope stack 10761 // does not contain the declaration context, i.e., in an out-of-line 10762 // definition of a class. 10763 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10764 if (!DCScope) { 10765 FakeDCScope.setEntity(DC); 10766 DCScope = &FakeDCScope; 10767 } 10768 10769 bool AddToScope = true; 10770 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10771 TemplateParams, AddToScope); 10772 if (!ND) return 0; 10773 10774 assert(ND->getDeclContext() == DC); 10775 assert(ND->getLexicalDeclContext() == CurContext); 10776 10777 // Add the function declaration to the appropriate lookup tables, 10778 // adjusting the redeclarations list as necessary. We don't 10779 // want to do this yet if the friending class is dependent. 10780 // 10781 // Also update the scope-based lookup if the target context's 10782 // lookup context is in lexical scope. 10783 if (!CurContext->isDependentContext()) { 10784 DC = DC->getRedeclContext(); 10785 DC->makeDeclVisibleInContext(ND); 10786 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10787 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10788 } 10789 10790 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10791 D.getIdentifierLoc(), ND, 10792 DS.getFriendSpecLoc()); 10793 FrD->setAccess(AS_public); 10794 CurContext->addDecl(FrD); 10795 10796 if (ND->isInvalidDecl()) { 10797 FrD->setInvalidDecl(); 10798 } else { 10799 if (DC->isRecord()) CheckFriendAccess(ND); 10800 10801 FunctionDecl *FD; 10802 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10803 FD = FTD->getTemplatedDecl(); 10804 else 10805 FD = cast<FunctionDecl>(ND); 10806 10807 // Mark templated-scope function declarations as unsupported. 10808 if (FD->getNumTemplateParameterLists()) 10809 FrD->setUnsupportedFriend(true); 10810 } 10811 10812 return ND; 10813} 10814 10815void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10816 AdjustDeclIfTemplate(Dcl); 10817 10818 FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(Dcl); 10819 if (!Fn) { 10820 Diag(DelLoc, diag::err_deleted_non_function); 10821 return; 10822 } 10823 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10824 // Don't consider the implicit declaration we generate for explicit 10825 // specializations. FIXME: Do not generate these implicit declarations. 10826 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 10827 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 10828 Diag(DelLoc, diag::err_deleted_decl_not_first); 10829 Diag(Prev->getLocation(), diag::note_previous_declaration); 10830 } 10831 // If the declaration wasn't the first, we delete the function anyway for 10832 // recovery. 10833 } 10834 Fn->setDeletedAsWritten(); 10835} 10836 10837void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10838 CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Dcl); 10839 10840 if (MD) { 10841 if (MD->getParent()->isDependentType()) { 10842 MD->setDefaulted(); 10843 MD->setExplicitlyDefaulted(); 10844 return; 10845 } 10846 10847 CXXSpecialMember Member = getSpecialMember(MD); 10848 if (Member == CXXInvalid) { 10849 Diag(DefaultLoc, diag::err_default_special_members); 10850 return; 10851 } 10852 10853 MD->setDefaulted(); 10854 MD->setExplicitlyDefaulted(); 10855 10856 // If this definition appears within the record, do the checking when 10857 // the record is complete. 10858 const FunctionDecl *Primary = MD; 10859 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern()) 10860 // Find the uninstantiated declaration that actually had the '= default' 10861 // on it. 10862 Pattern->isDefined(Primary); 10863 10864 if (Primary == Primary->getCanonicalDecl()) 10865 return; 10866 10867 CheckExplicitlyDefaultedSpecialMember(MD); 10868 10869 // The exception specification is needed because we are defining the 10870 // function. 10871 ResolveExceptionSpec(DefaultLoc, 10872 MD->getType()->castAs<FunctionProtoType>()); 10873 10874 switch (Member) { 10875 case CXXDefaultConstructor: { 10876 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10877 if (!CD->isInvalidDecl()) 10878 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10879 break; 10880 } 10881 10882 case CXXCopyConstructor: { 10883 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10884 if (!CD->isInvalidDecl()) 10885 DefineImplicitCopyConstructor(DefaultLoc, CD); 10886 break; 10887 } 10888 10889 case CXXCopyAssignment: { 10890 if (!MD->isInvalidDecl()) 10891 DefineImplicitCopyAssignment(DefaultLoc, MD); 10892 break; 10893 } 10894 10895 case CXXDestructor: { 10896 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10897 if (!DD->isInvalidDecl()) 10898 DefineImplicitDestructor(DefaultLoc, DD); 10899 break; 10900 } 10901 10902 case CXXMoveConstructor: { 10903 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10904 if (!CD->isInvalidDecl()) 10905 DefineImplicitMoveConstructor(DefaultLoc, CD); 10906 break; 10907 } 10908 10909 case CXXMoveAssignment: { 10910 if (!MD->isInvalidDecl()) 10911 DefineImplicitMoveAssignment(DefaultLoc, MD); 10912 break; 10913 } 10914 10915 case CXXInvalid: 10916 llvm_unreachable("Invalid special member."); 10917 } 10918 } else { 10919 Diag(DefaultLoc, diag::err_default_special_members); 10920 } 10921} 10922 10923static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10924 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10925 Stmt *SubStmt = *CI; 10926 if (!SubStmt) 10927 continue; 10928 if (isa<ReturnStmt>(SubStmt)) 10929 Self.Diag(SubStmt->getLocStart(), 10930 diag::err_return_in_constructor_handler); 10931 if (!isa<Expr>(SubStmt)) 10932 SearchForReturnInStmt(Self, SubStmt); 10933 } 10934} 10935 10936void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10937 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10938 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10939 SearchForReturnInStmt(*this, Handler); 10940 } 10941} 10942 10943bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 10944 const CXXMethodDecl *Old) { 10945 const FunctionType *NewFT = New->getType()->getAs<FunctionType>(); 10946 const FunctionType *OldFT = Old->getType()->getAs<FunctionType>(); 10947 10948 CallingConv NewCC = NewFT->getCallConv(), OldCC = OldFT->getCallConv(); 10949 10950 // If the calling conventions match, everything is fine 10951 if (NewCC == OldCC) 10952 return false; 10953 10954 // If either of the calling conventions are set to "default", we need to pick 10955 // something more sensible based on the target. This supports code where the 10956 // one method explicitly sets thiscall, and another has no explicit calling 10957 // convention. 10958 CallingConv Default = 10959 Context.getTargetInfo().getDefaultCallingConv(TargetInfo::CCMT_Member); 10960 if (NewCC == CC_Default) 10961 NewCC = Default; 10962 if (OldCC == CC_Default) 10963 OldCC = Default; 10964 10965 // If the calling conventions still don't match, then report the error 10966 if (NewCC != OldCC) { 10967 Diag(New->getLocation(), 10968 diag::err_conflicting_overriding_cc_attributes) 10969 << New->getDeclName() << New->getType() << Old->getType(); 10970 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10971 return true; 10972 } 10973 10974 return false; 10975} 10976 10977bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10978 const CXXMethodDecl *Old) { 10979 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10980 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10981 10982 if (Context.hasSameType(NewTy, OldTy) || 10983 NewTy->isDependentType() || OldTy->isDependentType()) 10984 return false; 10985 10986 // Check if the return types are covariant 10987 QualType NewClassTy, OldClassTy; 10988 10989 /// Both types must be pointers or references to classes. 10990 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10991 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10992 NewClassTy = NewPT->getPointeeType(); 10993 OldClassTy = OldPT->getPointeeType(); 10994 } 10995 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10996 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10997 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10998 NewClassTy = NewRT->getPointeeType(); 10999 OldClassTy = OldRT->getPointeeType(); 11000 } 11001 } 11002 } 11003 11004 // The return types aren't either both pointers or references to a class type. 11005 if (NewClassTy.isNull()) { 11006 Diag(New->getLocation(), 11007 diag::err_different_return_type_for_overriding_virtual_function) 11008 << New->getDeclName() << NewTy << OldTy; 11009 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11010 11011 return true; 11012 } 11013 11014 // C++ [class.virtual]p6: 11015 // If the return type of D::f differs from the return type of B::f, the 11016 // class type in the return type of D::f shall be complete at the point of 11017 // declaration of D::f or shall be the class type D. 11018 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 11019 if (!RT->isBeingDefined() && 11020 RequireCompleteType(New->getLocation(), NewClassTy, 11021 diag::err_covariant_return_incomplete, 11022 New->getDeclName())) 11023 return true; 11024 } 11025 11026 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 11027 // Check if the new class derives from the old class. 11028 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 11029 Diag(New->getLocation(), 11030 diag::err_covariant_return_not_derived) 11031 << New->getDeclName() << NewTy << OldTy; 11032 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11033 return true; 11034 } 11035 11036 // Check if we the conversion from derived to base is valid. 11037 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 11038 diag::err_covariant_return_inaccessible_base, 11039 diag::err_covariant_return_ambiguous_derived_to_base_conv, 11040 // FIXME: Should this point to the return type? 11041 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 11042 // FIXME: this note won't trigger for delayed access control 11043 // diagnostics, and it's impossible to get an undelayed error 11044 // here from access control during the original parse because 11045 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 11046 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11047 return true; 11048 } 11049 } 11050 11051 // The qualifiers of the return types must be the same. 11052 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 11053 Diag(New->getLocation(), 11054 diag::err_covariant_return_type_different_qualifications) 11055 << New->getDeclName() << NewTy << OldTy; 11056 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11057 return true; 11058 }; 11059 11060 11061 // The new class type must have the same or less qualifiers as the old type. 11062 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 11063 Diag(New->getLocation(), 11064 diag::err_covariant_return_type_class_type_more_qualified) 11065 << New->getDeclName() << NewTy << OldTy; 11066 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11067 return true; 11068 }; 11069 11070 return false; 11071} 11072 11073/// \brief Mark the given method pure. 11074/// 11075/// \param Method the method to be marked pure. 11076/// 11077/// \param InitRange the source range that covers the "0" initializer. 11078bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 11079 SourceLocation EndLoc = InitRange.getEnd(); 11080 if (EndLoc.isValid()) 11081 Method->setRangeEnd(EndLoc); 11082 11083 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 11084 Method->setPure(); 11085 return false; 11086 } 11087 11088 if (!Method->isInvalidDecl()) 11089 Diag(Method->getLocation(), diag::err_non_virtual_pure) 11090 << Method->getDeclName() << InitRange; 11091 return true; 11092} 11093 11094/// \brief Determine whether the given declaration is a static data member. 11095static bool isStaticDataMember(Decl *D) { 11096 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 11097 if (!Var) 11098 return false; 11099 11100 return Var->isStaticDataMember(); 11101} 11102/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 11103/// an initializer for the out-of-line declaration 'Dcl'. The scope 11104/// is a fresh scope pushed for just this purpose. 11105/// 11106/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 11107/// static data member of class X, names should be looked up in the scope of 11108/// class X. 11109void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 11110 // If there is no declaration, there was an error parsing it. 11111 if (D == 0 || D->isInvalidDecl()) return; 11112 11113 // We should only get called for declarations with scope specifiers, like: 11114 // int foo::bar; 11115 assert(D->isOutOfLine()); 11116 EnterDeclaratorContext(S, D->getDeclContext()); 11117 11118 // If we are parsing the initializer for a static data member, push a 11119 // new expression evaluation context that is associated with this static 11120 // data member. 11121 if (isStaticDataMember(D)) 11122 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 11123} 11124 11125/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 11126/// initializer for the out-of-line declaration 'D'. 11127void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 11128 // If there is no declaration, there was an error parsing it. 11129 if (D == 0 || D->isInvalidDecl()) return; 11130 11131 if (isStaticDataMember(D)) 11132 PopExpressionEvaluationContext(); 11133 11134 assert(D->isOutOfLine()); 11135 ExitDeclaratorContext(S); 11136} 11137 11138/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 11139/// C++ if/switch/while/for statement. 11140/// e.g: "if (int x = f()) {...}" 11141DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 11142 // C++ 6.4p2: 11143 // The declarator shall not specify a function or an array. 11144 // The type-specifier-seq shall not contain typedef and shall not declare a 11145 // new class or enumeration. 11146 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 11147 "Parser allowed 'typedef' as storage class of condition decl."); 11148 11149 Decl *Dcl = ActOnDeclarator(S, D); 11150 if (!Dcl) 11151 return true; 11152 11153 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 11154 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 11155 << D.getSourceRange(); 11156 return true; 11157 } 11158 11159 return Dcl; 11160} 11161 11162void Sema::LoadExternalVTableUses() { 11163 if (!ExternalSource) 11164 return; 11165 11166 SmallVector<ExternalVTableUse, 4> VTables; 11167 ExternalSource->ReadUsedVTables(VTables); 11168 SmallVector<VTableUse, 4> NewUses; 11169 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 11170 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 11171 = VTablesUsed.find(VTables[I].Record); 11172 // Even if a definition wasn't required before, it may be required now. 11173 if (Pos != VTablesUsed.end()) { 11174 if (!Pos->second && VTables[I].DefinitionRequired) 11175 Pos->second = true; 11176 continue; 11177 } 11178 11179 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 11180 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 11181 } 11182 11183 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 11184} 11185 11186void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 11187 bool DefinitionRequired) { 11188 // Ignore any vtable uses in unevaluated operands or for classes that do 11189 // not have a vtable. 11190 if (!Class->isDynamicClass() || Class->isDependentContext() || 11191 CurContext->isDependentContext() || 11192 ExprEvalContexts.back().Context == Unevaluated) 11193 return; 11194 11195 // Try to insert this class into the map. 11196 LoadExternalVTableUses(); 11197 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 11198 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 11199 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 11200 if (!Pos.second) { 11201 // If we already had an entry, check to see if we are promoting this vtable 11202 // to required a definition. If so, we need to reappend to the VTableUses 11203 // list, since we may have already processed the first entry. 11204 if (DefinitionRequired && !Pos.first->second) { 11205 Pos.first->second = true; 11206 } else { 11207 // Otherwise, we can early exit. 11208 return; 11209 } 11210 } 11211 11212 // Local classes need to have their virtual members marked 11213 // immediately. For all other classes, we mark their virtual members 11214 // at the end of the translation unit. 11215 if (Class->isLocalClass()) 11216 MarkVirtualMembersReferenced(Loc, Class); 11217 else 11218 VTableUses.push_back(std::make_pair(Class, Loc)); 11219} 11220 11221bool Sema::DefineUsedVTables() { 11222 LoadExternalVTableUses(); 11223 if (VTableUses.empty()) 11224 return false; 11225 11226 // Note: The VTableUses vector could grow as a result of marking 11227 // the members of a class as "used", so we check the size each 11228 // time through the loop and prefer indices (which are stable) to 11229 // iterators (which are not). 11230 bool DefinedAnything = false; 11231 for (unsigned I = 0; I != VTableUses.size(); ++I) { 11232 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 11233 if (!Class) 11234 continue; 11235 11236 SourceLocation Loc = VTableUses[I].second; 11237 11238 bool DefineVTable = true; 11239 11240 // If this class has a key function, but that key function is 11241 // defined in another translation unit, we don't need to emit the 11242 // vtable even though we're using it. 11243 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 11244 if (KeyFunction && !KeyFunction->hasBody()) { 11245 switch (KeyFunction->getTemplateSpecializationKind()) { 11246 case TSK_Undeclared: 11247 case TSK_ExplicitSpecialization: 11248 case TSK_ExplicitInstantiationDeclaration: 11249 // The key function is in another translation unit. 11250 DefineVTable = false; 11251 break; 11252 11253 case TSK_ExplicitInstantiationDefinition: 11254 case TSK_ImplicitInstantiation: 11255 // We will be instantiating the key function. 11256 break; 11257 } 11258 } else if (!KeyFunction) { 11259 // If we have a class with no key function that is the subject 11260 // of an explicit instantiation declaration, suppress the 11261 // vtable; it will live with the explicit instantiation 11262 // definition. 11263 bool IsExplicitInstantiationDeclaration 11264 = Class->getTemplateSpecializationKind() 11265 == TSK_ExplicitInstantiationDeclaration; 11266 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 11267 REnd = Class->redecls_end(); 11268 R != REnd; ++R) { 11269 TemplateSpecializationKind TSK 11270 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 11271 if (TSK == TSK_ExplicitInstantiationDeclaration) 11272 IsExplicitInstantiationDeclaration = true; 11273 else if (TSK == TSK_ExplicitInstantiationDefinition) { 11274 IsExplicitInstantiationDeclaration = false; 11275 break; 11276 } 11277 } 11278 11279 if (IsExplicitInstantiationDeclaration) 11280 DefineVTable = false; 11281 } 11282 11283 // The exception specifications for all virtual members may be needed even 11284 // if we are not providing an authoritative form of the vtable in this TU. 11285 // We may choose to emit it available_externally anyway. 11286 if (!DefineVTable) { 11287 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 11288 continue; 11289 } 11290 11291 // Mark all of the virtual members of this class as referenced, so 11292 // that we can build a vtable. Then, tell the AST consumer that a 11293 // vtable for this class is required. 11294 DefinedAnything = true; 11295 MarkVirtualMembersReferenced(Loc, Class); 11296 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 11297 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 11298 11299 // Optionally warn if we're emitting a weak vtable. 11300 if (Class->getLinkage() == ExternalLinkage && 11301 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 11302 const FunctionDecl *KeyFunctionDef = 0; 11303 if (!KeyFunction || 11304 (KeyFunction->hasBody(KeyFunctionDef) && 11305 KeyFunctionDef->isInlined())) 11306 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 11307 TSK_ExplicitInstantiationDefinition 11308 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 11309 << Class; 11310 } 11311 } 11312 VTableUses.clear(); 11313 11314 return DefinedAnything; 11315} 11316 11317void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 11318 const CXXRecordDecl *RD) { 11319 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 11320 E = RD->method_end(); I != E; ++I) 11321 if ((*I)->isVirtual() && !(*I)->isPure()) 11322 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 11323} 11324 11325void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 11326 const CXXRecordDecl *RD) { 11327 // Mark all functions which will appear in RD's vtable as used. 11328 CXXFinalOverriderMap FinalOverriders; 11329 RD->getFinalOverriders(FinalOverriders); 11330 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 11331 E = FinalOverriders.end(); 11332 I != E; ++I) { 11333 for (OverridingMethods::const_iterator OI = I->second.begin(), 11334 OE = I->second.end(); 11335 OI != OE; ++OI) { 11336 assert(OI->second.size() > 0 && "no final overrider"); 11337 CXXMethodDecl *Overrider = OI->second.front().Method; 11338 11339 // C++ [basic.def.odr]p2: 11340 // [...] A virtual member function is used if it is not pure. [...] 11341 if (!Overrider->isPure()) 11342 MarkFunctionReferenced(Loc, Overrider); 11343 } 11344 } 11345 11346 // Only classes that have virtual bases need a VTT. 11347 if (RD->getNumVBases() == 0) 11348 return; 11349 11350 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 11351 e = RD->bases_end(); i != e; ++i) { 11352 const CXXRecordDecl *Base = 11353 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 11354 if (Base->getNumVBases() == 0) 11355 continue; 11356 MarkVirtualMembersReferenced(Loc, Base); 11357 } 11358} 11359 11360/// SetIvarInitializers - This routine builds initialization ASTs for the 11361/// Objective-C implementation whose ivars need be initialized. 11362void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 11363 if (!getLangOpts().CPlusPlus) 11364 return; 11365 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 11366 SmallVector<ObjCIvarDecl*, 8> ivars; 11367 CollectIvarsToConstructOrDestruct(OID, ivars); 11368 if (ivars.empty()) 11369 return; 11370 SmallVector<CXXCtorInitializer*, 32> AllToInit; 11371 for (unsigned i = 0; i < ivars.size(); i++) { 11372 FieldDecl *Field = ivars[i]; 11373 if (Field->isInvalidDecl()) 11374 continue; 11375 11376 CXXCtorInitializer *Member; 11377 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 11378 InitializationKind InitKind = 11379 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 11380 11381 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 11382 ExprResult MemberInit = 11383 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 11384 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 11385 // Note, MemberInit could actually come back empty if no initialization 11386 // is required (e.g., because it would call a trivial default constructor) 11387 if (!MemberInit.get() || MemberInit.isInvalid()) 11388 continue; 11389 11390 Member = 11391 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 11392 SourceLocation(), 11393 MemberInit.takeAs<Expr>(), 11394 SourceLocation()); 11395 AllToInit.push_back(Member); 11396 11397 // Be sure that the destructor is accessible and is marked as referenced. 11398 if (const RecordType *RecordTy 11399 = Context.getBaseElementType(Field->getType()) 11400 ->getAs<RecordType>()) { 11401 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 11402 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 11403 MarkFunctionReferenced(Field->getLocation(), Destructor); 11404 CheckDestructorAccess(Field->getLocation(), Destructor, 11405 PDiag(diag::err_access_dtor_ivar) 11406 << Context.getBaseElementType(Field->getType())); 11407 } 11408 } 11409 } 11410 ObjCImplementation->setIvarInitializers(Context, 11411 AllToInit.data(), AllToInit.size()); 11412 } 11413} 11414 11415static 11416void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 11417 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 11418 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 11419 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 11420 Sema &S) { 11421 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11422 CE = Current.end(); 11423 if (Ctor->isInvalidDecl()) 11424 return; 11425 11426 CXXConstructorDecl *Target = Ctor->getTargetConstructor(); 11427 11428 // Target may not be determinable yet, for instance if this is a dependent 11429 // call in an uninstantiated template. 11430 if (Target) { 11431 const FunctionDecl *FNTarget = 0; 11432 (void)Target->hasBody(FNTarget); 11433 Target = const_cast<CXXConstructorDecl*>( 11434 cast_or_null<CXXConstructorDecl>(FNTarget)); 11435 } 11436 11437 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 11438 // Avoid dereferencing a null pointer here. 11439 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 11440 11441 if (!Current.insert(Canonical)) 11442 return; 11443 11444 // We know that beyond here, we aren't chaining into a cycle. 11445 if (!Target || !Target->isDelegatingConstructor() || 11446 Target->isInvalidDecl() || Valid.count(TCanonical)) { 11447 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11448 Valid.insert(*CI); 11449 Current.clear(); 11450 // We've hit a cycle. 11451 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 11452 Current.count(TCanonical)) { 11453 // If we haven't diagnosed this cycle yet, do so now. 11454 if (!Invalid.count(TCanonical)) { 11455 S.Diag((*Ctor->init_begin())->getSourceLocation(), 11456 diag::warn_delegating_ctor_cycle) 11457 << Ctor; 11458 11459 // Don't add a note for a function delegating directly to itself. 11460 if (TCanonical != Canonical) 11461 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11462 11463 CXXConstructorDecl *C = Target; 11464 while (C->getCanonicalDecl() != Canonical) { 11465 const FunctionDecl *FNTarget = 0; 11466 (void)C->getTargetConstructor()->hasBody(FNTarget); 11467 assert(FNTarget && "Ctor cycle through bodiless function"); 11468 11469 C = const_cast<CXXConstructorDecl*>( 11470 cast<CXXConstructorDecl>(FNTarget)); 11471 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11472 } 11473 } 11474 11475 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11476 Invalid.insert(*CI); 11477 Current.clear(); 11478 } else { 11479 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11480 } 11481} 11482 11483 11484void Sema::CheckDelegatingCtorCycles() { 11485 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11486 11487 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11488 CE = Current.end(); 11489 11490 for (DelegatingCtorDeclsType::iterator 11491 I = DelegatingCtorDecls.begin(ExternalSource), 11492 E = DelegatingCtorDecls.end(); 11493 I != E; ++I) 11494 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11495 11496 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11497 (*CI)->setInvalidDecl(); 11498} 11499 11500namespace { 11501 /// \brief AST visitor that finds references to the 'this' expression. 11502 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 11503 Sema &S; 11504 11505 public: 11506 explicit FindCXXThisExpr(Sema &S) : S(S) { } 11507 11508 bool VisitCXXThisExpr(CXXThisExpr *E) { 11509 S.Diag(E->getLocation(), diag::err_this_static_member_func) 11510 << E->isImplicit(); 11511 return false; 11512 } 11513 }; 11514} 11515 11516bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 11517 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11518 if (!TSInfo) 11519 return false; 11520 11521 TypeLoc TL = TSInfo->getTypeLoc(); 11522 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11523 if (!ProtoTL) 11524 return false; 11525 11526 // C++11 [expr.prim.general]p3: 11527 // [The expression this] shall not appear before the optional 11528 // cv-qualifier-seq and it shall not appear within the declaration of a 11529 // static member function (although its type and value category are defined 11530 // within a static member function as they are within a non-static member 11531 // function). [ Note: this is because declaration matching does not occur 11532 // until the complete declarator is known. - end note ] 11533 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11534 FindCXXThisExpr Finder(*this); 11535 11536 // If the return type came after the cv-qualifier-seq, check it now. 11537 if (Proto->hasTrailingReturn() && 11538 !Finder.TraverseTypeLoc(ProtoTL->getResultLoc())) 11539 return true; 11540 11541 // Check the exception specification. 11542 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 11543 return true; 11544 11545 return checkThisInStaticMemberFunctionAttributes(Method); 11546} 11547 11548bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 11549 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11550 if (!TSInfo) 11551 return false; 11552 11553 TypeLoc TL = TSInfo->getTypeLoc(); 11554 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11555 if (!ProtoTL) 11556 return false; 11557 11558 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11559 FindCXXThisExpr Finder(*this); 11560 11561 switch (Proto->getExceptionSpecType()) { 11562 case EST_Uninstantiated: 11563 case EST_Unevaluated: 11564 case EST_BasicNoexcept: 11565 case EST_DynamicNone: 11566 case EST_MSAny: 11567 case EST_None: 11568 break; 11569 11570 case EST_ComputedNoexcept: 11571 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11572 return true; 11573 11574 case EST_Dynamic: 11575 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11576 EEnd = Proto->exception_end(); 11577 E != EEnd; ++E) { 11578 if (!Finder.TraverseType(*E)) 11579 return true; 11580 } 11581 break; 11582 } 11583 11584 return false; 11585} 11586 11587bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11588 FindCXXThisExpr Finder(*this); 11589 11590 // Check attributes. 11591 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11592 A != AEnd; ++A) { 11593 // FIXME: This should be emitted by tblgen. 11594 Expr *Arg = 0; 11595 ArrayRef<Expr *> Args; 11596 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11597 Arg = G->getArg(); 11598 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11599 Arg = G->getArg(); 11600 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11601 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11602 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11603 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11604 else if (ExclusiveLockFunctionAttr *ELF 11605 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11606 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11607 else if (SharedLockFunctionAttr *SLF 11608 = dyn_cast<SharedLockFunctionAttr>(*A)) 11609 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11610 else if (ExclusiveTrylockFunctionAttr *ETLF 11611 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11612 Arg = ETLF->getSuccessValue(); 11613 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11614 } else if (SharedTrylockFunctionAttr *STLF 11615 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11616 Arg = STLF->getSuccessValue(); 11617 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11618 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11619 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11620 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11621 Arg = LR->getArg(); 11622 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11623 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11624 else if (ExclusiveLocksRequiredAttr *ELR 11625 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11626 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11627 else if (SharedLocksRequiredAttr *SLR 11628 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11629 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11630 11631 if (Arg && !Finder.TraverseStmt(Arg)) 11632 return true; 11633 11634 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11635 if (!Finder.TraverseStmt(Args[I])) 11636 return true; 11637 } 11638 } 11639 11640 return false; 11641} 11642 11643void 11644Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 11645 ArrayRef<ParsedType> DynamicExceptions, 11646 ArrayRef<SourceRange> DynamicExceptionRanges, 11647 Expr *NoexceptExpr, 11648 SmallVectorImpl<QualType> &Exceptions, 11649 FunctionProtoType::ExtProtoInfo &EPI) { 11650 Exceptions.clear(); 11651 EPI.ExceptionSpecType = EST; 11652 if (EST == EST_Dynamic) { 11653 Exceptions.reserve(DynamicExceptions.size()); 11654 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 11655 // FIXME: Preserve type source info. 11656 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 11657 11658 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 11659 collectUnexpandedParameterPacks(ET, Unexpanded); 11660 if (!Unexpanded.empty()) { 11661 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 11662 UPPC_ExceptionType, 11663 Unexpanded); 11664 continue; 11665 } 11666 11667 // Check that the type is valid for an exception spec, and 11668 // drop it if not. 11669 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 11670 Exceptions.push_back(ET); 11671 } 11672 EPI.NumExceptions = Exceptions.size(); 11673 EPI.Exceptions = Exceptions.data(); 11674 return; 11675 } 11676 11677 if (EST == EST_ComputedNoexcept) { 11678 // If an error occurred, there's no expression here. 11679 if (NoexceptExpr) { 11680 assert((NoexceptExpr->isTypeDependent() || 11681 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 11682 Context.BoolTy) && 11683 "Parser should have made sure that the expression is boolean"); 11684 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 11685 EPI.ExceptionSpecType = EST_BasicNoexcept; 11686 return; 11687 } 11688 11689 if (!NoexceptExpr->isValueDependent()) 11690 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 11691 diag::err_noexcept_needs_constant_expression, 11692 /*AllowFold*/ false).take(); 11693 EPI.NoexceptExpr = NoexceptExpr; 11694 } 11695 return; 11696 } 11697} 11698 11699/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11700Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11701 // Implicitly declared functions (e.g. copy constructors) are 11702 // __host__ __device__ 11703 if (D->isImplicit()) 11704 return CFT_HostDevice; 11705 11706 if (D->hasAttr<CUDAGlobalAttr>()) 11707 return CFT_Global; 11708 11709 if (D->hasAttr<CUDADeviceAttr>()) { 11710 if (D->hasAttr<CUDAHostAttr>()) 11711 return CFT_HostDevice; 11712 else 11713 return CFT_Device; 11714 } 11715 11716 return CFT_Host; 11717} 11718 11719bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11720 CUDAFunctionTarget CalleeTarget) { 11721 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11722 // Callable from the device only." 11723 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11724 return true; 11725 11726 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11727 // Callable from the host only." 11728 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11729 // Callable from the host only." 11730 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11731 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11732 return true; 11733 11734 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11735 return true; 11736 11737 return false; 11738} 11739