SemaDeclCXX.cpp revision 76398e5ad39ae719dcc650c7cddeb25379c02c34
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "clang/AST/ASTConsumer.h" 21#include "clang/AST/ASTContext.h" 22#include "clang/AST/ASTMutationListener.h" 23#include "clang/AST/CharUnits.h" 24#include "clang/AST/CXXInheritance.h" 25#include "clang/AST/DeclVisitor.h" 26#include "clang/AST/EvaluatedExprVisitor.h" 27#include "clang/AST/ExprCXX.h" 28#include "clang/AST/RecordLayout.h" 29#include "clang/AST/RecursiveASTVisitor.h" 30#include "clang/AST/StmtVisitor.h" 31#include "clang/AST/TypeLoc.h" 32#include "clang/AST/TypeOrdering.h" 33#include "clang/Sema/DeclSpec.h" 34#include "clang/Sema/ParsedTemplate.h" 35#include "clang/Basic/PartialDiagnostic.h" 36#include "clang/Lex/Preprocessor.h" 37#include "llvm/ADT/SmallString.h" 38#include "llvm/ADT/STLExtras.h" 39#include <map> 40#include <set> 41 42using namespace clang; 43 44//===----------------------------------------------------------------------===// 45// CheckDefaultArgumentVisitor 46//===----------------------------------------------------------------------===// 47 48namespace { 49 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 50 /// the default argument of a parameter to determine whether it 51 /// contains any ill-formed subexpressions. For example, this will 52 /// diagnose the use of local variables or parameters within the 53 /// default argument expression. 54 class CheckDefaultArgumentVisitor 55 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 56 Expr *DefaultArg; 57 Sema *S; 58 59 public: 60 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 61 : DefaultArg(defarg), S(s) {} 62 63 bool VisitExpr(Expr *Node); 64 bool VisitDeclRefExpr(DeclRefExpr *DRE); 65 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 66 bool VisitLambdaExpr(LambdaExpr *Lambda); 67 }; 68 69 /// VisitExpr - Visit all of the children of this expression. 70 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 71 bool IsInvalid = false; 72 for (Stmt::child_range I = Node->children(); I; ++I) 73 IsInvalid |= Visit(*I); 74 return IsInvalid; 75 } 76 77 /// VisitDeclRefExpr - Visit a reference to a declaration, to 78 /// determine whether this declaration can be used in the default 79 /// argument expression. 80 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 81 NamedDecl *Decl = DRE->getDecl(); 82 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 83 // C++ [dcl.fct.default]p9 84 // Default arguments are evaluated each time the function is 85 // called. The order of evaluation of function arguments is 86 // unspecified. Consequently, parameters of a function shall not 87 // be used in default argument expressions, even if they are not 88 // evaluated. Parameters of a function declared before a default 89 // argument expression are in scope and can hide namespace and 90 // class member names. 91 return S->Diag(DRE->getLocStart(), 92 diag::err_param_default_argument_references_param) 93 << Param->getDeclName() << DefaultArg->getSourceRange(); 94 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 95 // C++ [dcl.fct.default]p7 96 // Local variables shall not be used in default argument 97 // expressions. 98 if (VDecl->isLocalVarDecl()) 99 return S->Diag(DRE->getLocStart(), 100 diag::err_param_default_argument_references_local) 101 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 102 } 103 104 return false; 105 } 106 107 /// VisitCXXThisExpr - Visit a C++ "this" expression. 108 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 109 // C++ [dcl.fct.default]p8: 110 // The keyword this shall not be used in a default argument of a 111 // member function. 112 return S->Diag(ThisE->getLocStart(), 113 diag::err_param_default_argument_references_this) 114 << ThisE->getSourceRange(); 115 } 116 117 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 118 // C++11 [expr.lambda.prim]p13: 119 // A lambda-expression appearing in a default argument shall not 120 // implicitly or explicitly capture any entity. 121 if (Lambda->capture_begin() == Lambda->capture_end()) 122 return false; 123 124 return S->Diag(Lambda->getLocStart(), 125 diag::err_lambda_capture_default_arg); 126 } 127} 128 129void Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, 130 CXXMethodDecl *Method) { 131 // If we have an MSAny spec already, don't bother. 132 if (!Method || ComputedEST == EST_MSAny) 133 return; 134 135 const FunctionProtoType *Proto 136 = Method->getType()->getAs<FunctionProtoType>(); 137 Proto = Self->ResolveExceptionSpec(CallLoc, Proto); 138 if (!Proto) 139 return; 140 141 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 142 143 // If this function can throw any exceptions, make a note of that. 144 if (EST == EST_MSAny || EST == EST_None) { 145 ClearExceptions(); 146 ComputedEST = EST; 147 return; 148 } 149 150 // FIXME: If the call to this decl is using any of its default arguments, we 151 // need to search them for potentially-throwing calls. 152 153 // If this function has a basic noexcept, it doesn't affect the outcome. 154 if (EST == EST_BasicNoexcept) 155 return; 156 157 // If we have a throw-all spec at this point, ignore the function. 158 if (ComputedEST == EST_None) 159 return; 160 161 // If we're still at noexcept(true) and there's a nothrow() callee, 162 // change to that specification. 163 if (EST == EST_DynamicNone) { 164 if (ComputedEST == EST_BasicNoexcept) 165 ComputedEST = EST_DynamicNone; 166 return; 167 } 168 169 // Check out noexcept specs. 170 if (EST == EST_ComputedNoexcept) { 171 FunctionProtoType::NoexceptResult NR = 172 Proto->getNoexceptSpec(Self->Context); 173 assert(NR != FunctionProtoType::NR_NoNoexcept && 174 "Must have noexcept result for EST_ComputedNoexcept."); 175 assert(NR != FunctionProtoType::NR_Dependent && 176 "Should not generate implicit declarations for dependent cases, " 177 "and don't know how to handle them anyway."); 178 179 // noexcept(false) -> no spec on the new function 180 if (NR == FunctionProtoType::NR_Throw) { 181 ClearExceptions(); 182 ComputedEST = EST_None; 183 } 184 // noexcept(true) won't change anything either. 185 return; 186 } 187 188 assert(EST == EST_Dynamic && "EST case not considered earlier."); 189 assert(ComputedEST != EST_None && 190 "Shouldn't collect exceptions when throw-all is guaranteed."); 191 ComputedEST = EST_Dynamic; 192 // Record the exceptions in this function's exception specification. 193 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 194 EEnd = Proto->exception_end(); 195 E != EEnd; ++E) 196 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E))) 197 Exceptions.push_back(*E); 198} 199 200void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 201 if (!E || ComputedEST == EST_MSAny) 202 return; 203 204 // FIXME: 205 // 206 // C++0x [except.spec]p14: 207 // [An] implicit exception-specification specifies the type-id T if and 208 // only if T is allowed by the exception-specification of a function directly 209 // invoked by f's implicit definition; f shall allow all exceptions if any 210 // function it directly invokes allows all exceptions, and f shall allow no 211 // exceptions if every function it directly invokes allows no exceptions. 212 // 213 // Note in particular that if an implicit exception-specification is generated 214 // for a function containing a throw-expression, that specification can still 215 // be noexcept(true). 216 // 217 // Note also that 'directly invoked' is not defined in the standard, and there 218 // is no indication that we should only consider potentially-evaluated calls. 219 // 220 // Ultimately we should implement the intent of the standard: the exception 221 // specification should be the set of exceptions which can be thrown by the 222 // implicit definition. For now, we assume that any non-nothrow expression can 223 // throw any exception. 224 225 if (Self->canThrow(E)) 226 ComputedEST = EST_None; 227} 228 229bool 230Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 231 SourceLocation EqualLoc) { 232 if (RequireCompleteType(Param->getLocation(), Param->getType(), 233 diag::err_typecheck_decl_incomplete_type)) { 234 Param->setInvalidDecl(); 235 return true; 236 } 237 238 // C++ [dcl.fct.default]p5 239 // A default argument expression is implicitly converted (clause 240 // 4) to the parameter type. The default argument expression has 241 // the same semantic constraints as the initializer expression in 242 // a declaration of a variable of the parameter type, using the 243 // copy-initialization semantics (8.5). 244 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 245 Param); 246 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 247 EqualLoc); 248 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 249 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg); 250 if (Result.isInvalid()) 251 return true; 252 Arg = Result.takeAs<Expr>(); 253 254 CheckImplicitConversions(Arg, EqualLoc); 255 Arg = MaybeCreateExprWithCleanups(Arg); 256 257 // Okay: add the default argument to the parameter 258 Param->setDefaultArg(Arg); 259 260 // We have already instantiated this parameter; provide each of the 261 // instantiations with the uninstantiated default argument. 262 UnparsedDefaultArgInstantiationsMap::iterator InstPos 263 = UnparsedDefaultArgInstantiations.find(Param); 264 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 265 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 266 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 267 268 // We're done tracking this parameter's instantiations. 269 UnparsedDefaultArgInstantiations.erase(InstPos); 270 } 271 272 return false; 273} 274 275/// ActOnParamDefaultArgument - Check whether the default argument 276/// provided for a function parameter is well-formed. If so, attach it 277/// to the parameter declaration. 278void 279Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 280 Expr *DefaultArg) { 281 if (!param || !DefaultArg) 282 return; 283 284 ParmVarDecl *Param = cast<ParmVarDecl>(param); 285 UnparsedDefaultArgLocs.erase(Param); 286 287 // Default arguments are only permitted in C++ 288 if (!getLangOpts().CPlusPlus) { 289 Diag(EqualLoc, diag::err_param_default_argument) 290 << DefaultArg->getSourceRange(); 291 Param->setInvalidDecl(); 292 return; 293 } 294 295 // Check for unexpanded parameter packs. 296 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 297 Param->setInvalidDecl(); 298 return; 299 } 300 301 // Check that the default argument is well-formed 302 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 303 if (DefaultArgChecker.Visit(DefaultArg)) { 304 Param->setInvalidDecl(); 305 return; 306 } 307 308 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 309} 310 311/// ActOnParamUnparsedDefaultArgument - We've seen a default 312/// argument for a function parameter, but we can't parse it yet 313/// because we're inside a class definition. Note that this default 314/// argument will be parsed later. 315void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 316 SourceLocation EqualLoc, 317 SourceLocation ArgLoc) { 318 if (!param) 319 return; 320 321 ParmVarDecl *Param = cast<ParmVarDecl>(param); 322 if (Param) 323 Param->setUnparsedDefaultArg(); 324 325 UnparsedDefaultArgLocs[Param] = ArgLoc; 326} 327 328/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 329/// the default argument for the parameter param failed. 330void Sema::ActOnParamDefaultArgumentError(Decl *param) { 331 if (!param) 332 return; 333 334 ParmVarDecl *Param = cast<ParmVarDecl>(param); 335 336 Param->setInvalidDecl(); 337 338 UnparsedDefaultArgLocs.erase(Param); 339} 340 341/// CheckExtraCXXDefaultArguments - Check for any extra default 342/// arguments in the declarator, which is not a function declaration 343/// or definition and therefore is not permitted to have default 344/// arguments. This routine should be invoked for every declarator 345/// that is not a function declaration or definition. 346void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 347 // C++ [dcl.fct.default]p3 348 // A default argument expression shall be specified only in the 349 // parameter-declaration-clause of a function declaration or in a 350 // template-parameter (14.1). It shall not be specified for a 351 // parameter pack. If it is specified in a 352 // parameter-declaration-clause, it shall not occur within a 353 // declarator or abstract-declarator of a parameter-declaration. 354 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 355 DeclaratorChunk &chunk = D.getTypeObject(i); 356 if (chunk.Kind == DeclaratorChunk::Function) { 357 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 358 ParmVarDecl *Param = 359 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 360 if (Param->hasUnparsedDefaultArg()) { 361 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 362 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 363 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 364 delete Toks; 365 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 366 } else if (Param->getDefaultArg()) { 367 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 368 << Param->getDefaultArg()->getSourceRange(); 369 Param->setDefaultArg(0); 370 } 371 } 372 } 373 } 374} 375 376/// MergeCXXFunctionDecl - Merge two declarations of the same C++ 377/// function, once we already know that they have the same 378/// type. Subroutine of MergeFunctionDecl. Returns true if there was an 379/// error, false otherwise. 380bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, 381 Scope *S) { 382 bool Invalid = false; 383 384 // C++ [dcl.fct.default]p4: 385 // For non-template functions, default arguments can be added in 386 // later declarations of a function in the same 387 // scope. Declarations in different scopes have completely 388 // distinct sets of default arguments. That is, declarations in 389 // inner scopes do not acquire default arguments from 390 // declarations in outer scopes, and vice versa. In a given 391 // function declaration, all parameters subsequent to a 392 // parameter with a default argument shall have default 393 // arguments supplied in this or previous declarations. A 394 // default argument shall not be redefined by a later 395 // declaration (not even to the same value). 396 // 397 // C++ [dcl.fct.default]p6: 398 // Except for member functions of class templates, the default arguments 399 // in a member function definition that appears outside of the class 400 // definition are added to the set of default arguments provided by the 401 // member function declaration in the class definition. 402 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 403 ParmVarDecl *OldParam = Old->getParamDecl(p); 404 ParmVarDecl *NewParam = New->getParamDecl(p); 405 406 bool OldParamHasDfl = OldParam->hasDefaultArg(); 407 bool NewParamHasDfl = NewParam->hasDefaultArg(); 408 409 NamedDecl *ND = Old; 410 if (S && !isDeclInScope(ND, New->getDeclContext(), S)) 411 // Ignore default parameters of old decl if they are not in 412 // the same scope. 413 OldParamHasDfl = false; 414 415 if (OldParamHasDfl && NewParamHasDfl) { 416 417 unsigned DiagDefaultParamID = 418 diag::err_param_default_argument_redefinition; 419 420 // MSVC accepts that default parameters be redefined for member functions 421 // of template class. The new default parameter's value is ignored. 422 Invalid = true; 423 if (getLangOpts().MicrosoftExt) { 424 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 425 if (MD && MD->getParent()->getDescribedClassTemplate()) { 426 // Merge the old default argument into the new parameter. 427 NewParam->setHasInheritedDefaultArg(); 428 if (OldParam->hasUninstantiatedDefaultArg()) 429 NewParam->setUninstantiatedDefaultArg( 430 OldParam->getUninstantiatedDefaultArg()); 431 else 432 NewParam->setDefaultArg(OldParam->getInit()); 433 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 434 Invalid = false; 435 } 436 } 437 438 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 439 // hint here. Alternatively, we could walk the type-source information 440 // for NewParam to find the last source location in the type... but it 441 // isn't worth the effort right now. This is the kind of test case that 442 // is hard to get right: 443 // int f(int); 444 // void g(int (*fp)(int) = f); 445 // void g(int (*fp)(int) = &f); 446 Diag(NewParam->getLocation(), DiagDefaultParamID) 447 << NewParam->getDefaultArgRange(); 448 449 // Look for the function declaration where the default argument was 450 // actually written, which may be a declaration prior to Old. 451 for (FunctionDecl *Older = Old->getPreviousDecl(); 452 Older; Older = Older->getPreviousDecl()) { 453 if (!Older->getParamDecl(p)->hasDefaultArg()) 454 break; 455 456 OldParam = Older->getParamDecl(p); 457 } 458 459 Diag(OldParam->getLocation(), diag::note_previous_definition) 460 << OldParam->getDefaultArgRange(); 461 } else if (OldParamHasDfl) { 462 // Merge the old default argument into the new parameter. 463 // It's important to use getInit() here; getDefaultArg() 464 // strips off any top-level ExprWithCleanups. 465 NewParam->setHasInheritedDefaultArg(); 466 if (OldParam->hasUninstantiatedDefaultArg()) 467 NewParam->setUninstantiatedDefaultArg( 468 OldParam->getUninstantiatedDefaultArg()); 469 else 470 NewParam->setDefaultArg(OldParam->getInit()); 471 } else if (NewParamHasDfl) { 472 if (New->getDescribedFunctionTemplate()) { 473 // Paragraph 4, quoted above, only applies to non-template functions. 474 Diag(NewParam->getLocation(), 475 diag::err_param_default_argument_template_redecl) 476 << NewParam->getDefaultArgRange(); 477 Diag(Old->getLocation(), diag::note_template_prev_declaration) 478 << false; 479 } else if (New->getTemplateSpecializationKind() 480 != TSK_ImplicitInstantiation && 481 New->getTemplateSpecializationKind() != TSK_Undeclared) { 482 // C++ [temp.expr.spec]p21: 483 // Default function arguments shall not be specified in a declaration 484 // or a definition for one of the following explicit specializations: 485 // - the explicit specialization of a function template; 486 // - the explicit specialization of a member function template; 487 // - the explicit specialization of a member function of a class 488 // template where the class template specialization to which the 489 // member function specialization belongs is implicitly 490 // instantiated. 491 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 492 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 493 << New->getDeclName() 494 << NewParam->getDefaultArgRange(); 495 } else if (New->getDeclContext()->isDependentContext()) { 496 // C++ [dcl.fct.default]p6 (DR217): 497 // Default arguments for a member function of a class template shall 498 // be specified on the initial declaration of the member function 499 // within the class template. 500 // 501 // Reading the tea leaves a bit in DR217 and its reference to DR205 502 // leads me to the conclusion that one cannot add default function 503 // arguments for an out-of-line definition of a member function of a 504 // dependent type. 505 int WhichKind = 2; 506 if (CXXRecordDecl *Record 507 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 508 if (Record->getDescribedClassTemplate()) 509 WhichKind = 0; 510 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 511 WhichKind = 1; 512 else 513 WhichKind = 2; 514 } 515 516 Diag(NewParam->getLocation(), 517 diag::err_param_default_argument_member_template_redecl) 518 << WhichKind 519 << NewParam->getDefaultArgRange(); 520 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 521 CXXSpecialMember NewSM = getSpecialMember(Ctor), 522 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 523 if (NewSM != OldSM) { 524 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 525 << NewParam->getDefaultArgRange() << NewSM; 526 Diag(Old->getLocation(), diag::note_previous_declaration_special) 527 << OldSM; 528 } 529 } 530 } 531 } 532 533 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 534 // template has a constexpr specifier then all its declarations shall 535 // contain the constexpr specifier. 536 if (New->isConstexpr() != Old->isConstexpr()) { 537 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 538 << New << New->isConstexpr(); 539 Diag(Old->getLocation(), diag::note_previous_declaration); 540 Invalid = true; 541 } 542 543 if (CheckEquivalentExceptionSpec(Old, New)) 544 Invalid = true; 545 546 return Invalid; 547} 548 549/// \brief Merge the exception specifications of two variable declarations. 550/// 551/// This is called when there's a redeclaration of a VarDecl. The function 552/// checks if the redeclaration might have an exception specification and 553/// validates compatibility and merges the specs if necessary. 554void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 555 // Shortcut if exceptions are disabled. 556 if (!getLangOpts().CXXExceptions) 557 return; 558 559 assert(Context.hasSameType(New->getType(), Old->getType()) && 560 "Should only be called if types are otherwise the same."); 561 562 QualType NewType = New->getType(); 563 QualType OldType = Old->getType(); 564 565 // We're only interested in pointers and references to functions, as well 566 // as pointers to member functions. 567 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 568 NewType = R->getPointeeType(); 569 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 570 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 571 NewType = P->getPointeeType(); 572 OldType = OldType->getAs<PointerType>()->getPointeeType(); 573 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 574 NewType = M->getPointeeType(); 575 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 576 } 577 578 if (!NewType->isFunctionProtoType()) 579 return; 580 581 // There's lots of special cases for functions. For function pointers, system 582 // libraries are hopefully not as broken so that we don't need these 583 // workarounds. 584 if (CheckEquivalentExceptionSpec( 585 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 586 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 587 New->setInvalidDecl(); 588 } 589} 590 591/// CheckCXXDefaultArguments - Verify that the default arguments for a 592/// function declaration are well-formed according to C++ 593/// [dcl.fct.default]. 594void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 595 unsigned NumParams = FD->getNumParams(); 596 unsigned p; 597 598 bool IsLambda = FD->getOverloadedOperator() == OO_Call && 599 isa<CXXMethodDecl>(FD) && 600 cast<CXXMethodDecl>(FD)->getParent()->isLambda(); 601 602 // Find first parameter with a default argument 603 for (p = 0; p < NumParams; ++p) { 604 ParmVarDecl *Param = FD->getParamDecl(p); 605 if (Param->hasDefaultArg()) { 606 // C++11 [expr.prim.lambda]p5: 607 // [...] Default arguments (8.3.6) shall not be specified in the 608 // parameter-declaration-clause of a lambda-declarator. 609 // 610 // FIXME: Core issue 974 strikes this sentence, we only provide an 611 // extension warning. 612 if (IsLambda) 613 Diag(Param->getLocation(), diag::ext_lambda_default_arguments) 614 << Param->getDefaultArgRange(); 615 break; 616 } 617 } 618 619 // C++ [dcl.fct.default]p4: 620 // In a given function declaration, all parameters 621 // subsequent to a parameter with a default argument shall 622 // have default arguments supplied in this or previous 623 // declarations. A default argument shall not be redefined 624 // by a later declaration (not even to the same value). 625 unsigned LastMissingDefaultArg = 0; 626 for (; p < NumParams; ++p) { 627 ParmVarDecl *Param = FD->getParamDecl(p); 628 if (!Param->hasDefaultArg()) { 629 if (Param->isInvalidDecl()) 630 /* We already complained about this parameter. */; 631 else if (Param->getIdentifier()) 632 Diag(Param->getLocation(), 633 diag::err_param_default_argument_missing_name) 634 << Param->getIdentifier(); 635 else 636 Diag(Param->getLocation(), 637 diag::err_param_default_argument_missing); 638 639 LastMissingDefaultArg = p; 640 } 641 } 642 643 if (LastMissingDefaultArg > 0) { 644 // Some default arguments were missing. Clear out all of the 645 // default arguments up to (and including) the last missing 646 // default argument, so that we leave the function parameters 647 // in a semantically valid state. 648 for (p = 0; p <= LastMissingDefaultArg; ++p) { 649 ParmVarDecl *Param = FD->getParamDecl(p); 650 if (Param->hasDefaultArg()) { 651 Param->setDefaultArg(0); 652 } 653 } 654 } 655} 656 657// CheckConstexprParameterTypes - Check whether a function's parameter types 658// are all literal types. If so, return true. If not, produce a suitable 659// diagnostic and return false. 660static bool CheckConstexprParameterTypes(Sema &SemaRef, 661 const FunctionDecl *FD) { 662 unsigned ArgIndex = 0; 663 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 664 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 665 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 666 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 667 SourceLocation ParamLoc = PD->getLocation(); 668 if (!(*i)->isDependentType() && 669 SemaRef.RequireLiteralType(ParamLoc, *i, 670 diag::err_constexpr_non_literal_param, 671 ArgIndex+1, PD->getSourceRange(), 672 isa<CXXConstructorDecl>(FD))) 673 return false; 674 } 675 return true; 676} 677 678/// \brief Get diagnostic %select index for tag kind for 679/// record diagnostic message. 680/// WARNING: Indexes apply to particular diagnostics only! 681/// 682/// \returns diagnostic %select index. 683static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) { 684 switch (Tag) { 685 case TTK_Struct: return 0; 686 case TTK_Interface: return 1; 687 case TTK_Class: return 2; 688 default: llvm_unreachable("Invalid tag kind for record diagnostic!"); 689 } 690} 691 692// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 693// the requirements of a constexpr function definition or a constexpr 694// constructor definition. If so, return true. If not, produce appropriate 695// diagnostics and return false. 696// 697// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 698bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 699 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 700 if (MD && MD->isInstance()) { 701 // C++11 [dcl.constexpr]p4: 702 // The definition of a constexpr constructor shall satisfy the following 703 // constraints: 704 // - the class shall not have any virtual base classes; 705 const CXXRecordDecl *RD = MD->getParent(); 706 if (RD->getNumVBases()) { 707 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 708 << isa<CXXConstructorDecl>(NewFD) 709 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 710 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 711 E = RD->vbases_end(); I != E; ++I) 712 Diag(I->getLocStart(), 713 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 714 return false; 715 } 716 } 717 718 if (!isa<CXXConstructorDecl>(NewFD)) { 719 // C++11 [dcl.constexpr]p3: 720 // The definition of a constexpr function shall satisfy the following 721 // constraints: 722 // - it shall not be virtual; 723 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 724 if (Method && Method->isVirtual()) { 725 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 726 727 // If it's not obvious why this function is virtual, find an overridden 728 // function which uses the 'virtual' keyword. 729 const CXXMethodDecl *WrittenVirtual = Method; 730 while (!WrittenVirtual->isVirtualAsWritten()) 731 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 732 if (WrittenVirtual != Method) 733 Diag(WrittenVirtual->getLocation(), 734 diag::note_overridden_virtual_function); 735 return false; 736 } 737 738 // - its return type shall be a literal type; 739 QualType RT = NewFD->getResultType(); 740 if (!RT->isDependentType() && 741 RequireLiteralType(NewFD->getLocation(), RT, 742 diag::err_constexpr_non_literal_return)) 743 return false; 744 } 745 746 // - each of its parameter types shall be a literal type; 747 if (!CheckConstexprParameterTypes(*this, NewFD)) 748 return false; 749 750 return true; 751} 752 753/// Check the given declaration statement is legal within a constexpr function 754/// body. C++0x [dcl.constexpr]p3,p4. 755/// 756/// \return true if the body is OK, false if we have diagnosed a problem. 757static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 758 DeclStmt *DS) { 759 // C++0x [dcl.constexpr]p3 and p4: 760 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 761 // contain only 762 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 763 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 764 switch ((*DclIt)->getKind()) { 765 case Decl::StaticAssert: 766 case Decl::Using: 767 case Decl::UsingShadow: 768 case Decl::UsingDirective: 769 case Decl::UnresolvedUsingTypename: 770 // - static_assert-declarations 771 // - using-declarations, 772 // - using-directives, 773 continue; 774 775 case Decl::Typedef: 776 case Decl::TypeAlias: { 777 // - typedef declarations and alias-declarations that do not define 778 // classes or enumerations, 779 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 780 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 781 // Don't allow variably-modified types in constexpr functions. 782 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 783 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 784 << TL.getSourceRange() << TL.getType() 785 << isa<CXXConstructorDecl>(Dcl); 786 return false; 787 } 788 continue; 789 } 790 791 case Decl::Enum: 792 case Decl::CXXRecord: 793 // As an extension, we allow the declaration (but not the definition) of 794 // classes and enumerations in all declarations, not just in typedef and 795 // alias declarations. 796 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 797 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 798 << isa<CXXConstructorDecl>(Dcl); 799 return false; 800 } 801 continue; 802 803 case Decl::Var: 804 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 805 << isa<CXXConstructorDecl>(Dcl); 806 return false; 807 808 default: 809 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 810 << isa<CXXConstructorDecl>(Dcl); 811 return false; 812 } 813 } 814 815 return true; 816} 817 818/// Check that the given field is initialized within a constexpr constructor. 819/// 820/// \param Dcl The constexpr constructor being checked. 821/// \param Field The field being checked. This may be a member of an anonymous 822/// struct or union nested within the class being checked. 823/// \param Inits All declarations, including anonymous struct/union members and 824/// indirect members, for which any initialization was provided. 825/// \param Diagnosed Set to true if an error is produced. 826static void CheckConstexprCtorInitializer(Sema &SemaRef, 827 const FunctionDecl *Dcl, 828 FieldDecl *Field, 829 llvm::SmallSet<Decl*, 16> &Inits, 830 bool &Diagnosed) { 831 if (Field->isUnnamedBitfield()) 832 return; 833 834 if (Field->isAnonymousStructOrUnion() && 835 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 836 return; 837 838 if (!Inits.count(Field)) { 839 if (!Diagnosed) { 840 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 841 Diagnosed = true; 842 } 843 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 844 } else if (Field->isAnonymousStructOrUnion()) { 845 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 846 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 847 I != E; ++I) 848 // If an anonymous union contains an anonymous struct of which any member 849 // is initialized, all members must be initialized. 850 if (!RD->isUnion() || Inits.count(*I)) 851 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 852 } 853} 854 855/// Check the body for the given constexpr function declaration only contains 856/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 857/// 858/// \return true if the body is OK, false if we have diagnosed a problem. 859bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 860 if (isa<CXXTryStmt>(Body)) { 861 // C++11 [dcl.constexpr]p3: 862 // The definition of a constexpr function shall satisfy the following 863 // constraints: [...] 864 // - its function-body shall be = delete, = default, or a 865 // compound-statement 866 // 867 // C++11 [dcl.constexpr]p4: 868 // In the definition of a constexpr constructor, [...] 869 // - its function-body shall not be a function-try-block; 870 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 871 << isa<CXXConstructorDecl>(Dcl); 872 return false; 873 } 874 875 // - its function-body shall be [...] a compound-statement that contains only 876 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 877 878 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 879 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 880 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 881 switch ((*BodyIt)->getStmtClass()) { 882 case Stmt::NullStmtClass: 883 // - null statements, 884 continue; 885 886 case Stmt::DeclStmtClass: 887 // - static_assert-declarations 888 // - using-declarations, 889 // - using-directives, 890 // - typedef declarations and alias-declarations that do not define 891 // classes or enumerations, 892 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 893 return false; 894 continue; 895 896 case Stmt::ReturnStmtClass: 897 // - and exactly one return statement; 898 if (isa<CXXConstructorDecl>(Dcl)) 899 break; 900 901 ReturnStmts.push_back((*BodyIt)->getLocStart()); 902 continue; 903 904 default: 905 break; 906 } 907 908 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 909 << isa<CXXConstructorDecl>(Dcl); 910 return false; 911 } 912 913 if (const CXXConstructorDecl *Constructor 914 = dyn_cast<CXXConstructorDecl>(Dcl)) { 915 const CXXRecordDecl *RD = Constructor->getParent(); 916 // DR1359: 917 // - every non-variant non-static data member and base class sub-object 918 // shall be initialized; 919 // - if the class is a non-empty union, or for each non-empty anonymous 920 // union member of a non-union class, exactly one non-static data member 921 // shall be initialized; 922 if (RD->isUnion()) { 923 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 924 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 925 return false; 926 } 927 } else if (!Constructor->isDependentContext() && 928 !Constructor->isDelegatingConstructor()) { 929 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 930 931 // Skip detailed checking if we have enough initializers, and we would 932 // allow at most one initializer per member. 933 bool AnyAnonStructUnionMembers = false; 934 unsigned Fields = 0; 935 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 936 E = RD->field_end(); I != E; ++I, ++Fields) { 937 if (I->isAnonymousStructOrUnion()) { 938 AnyAnonStructUnionMembers = true; 939 break; 940 } 941 } 942 if (AnyAnonStructUnionMembers || 943 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 944 // Check initialization of non-static data members. Base classes are 945 // always initialized so do not need to be checked. Dependent bases 946 // might not have initializers in the member initializer list. 947 llvm::SmallSet<Decl*, 16> Inits; 948 for (CXXConstructorDecl::init_const_iterator 949 I = Constructor->init_begin(), E = Constructor->init_end(); 950 I != E; ++I) { 951 if (FieldDecl *FD = (*I)->getMember()) 952 Inits.insert(FD); 953 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 954 Inits.insert(ID->chain_begin(), ID->chain_end()); 955 } 956 957 bool Diagnosed = false; 958 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 959 E = RD->field_end(); I != E; ++I) 960 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 961 if (Diagnosed) 962 return false; 963 } 964 } 965 } else { 966 if (ReturnStmts.empty()) { 967 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 968 return false; 969 } 970 if (ReturnStmts.size() > 1) { 971 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 972 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 973 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 974 return false; 975 } 976 } 977 978 // C++11 [dcl.constexpr]p5: 979 // if no function argument values exist such that the function invocation 980 // substitution would produce a constant expression, the program is 981 // ill-formed; no diagnostic required. 982 // C++11 [dcl.constexpr]p3: 983 // - every constructor call and implicit conversion used in initializing the 984 // return value shall be one of those allowed in a constant expression. 985 // C++11 [dcl.constexpr]p4: 986 // - every constructor involved in initializing non-static data members and 987 // base class sub-objects shall be a constexpr constructor. 988 llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 989 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 990 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr) 991 << isa<CXXConstructorDecl>(Dcl); 992 for (size_t I = 0, N = Diags.size(); I != N; ++I) 993 Diag(Diags[I].first, Diags[I].second); 994 return false; 995 } 996 997 return true; 998} 999 1000/// isCurrentClassName - Determine whether the identifier II is the 1001/// name of the class type currently being defined. In the case of 1002/// nested classes, this will only return true if II is the name of 1003/// the innermost class. 1004bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 1005 const CXXScopeSpec *SS) { 1006 assert(getLangOpts().CPlusPlus && "No class names in C!"); 1007 1008 CXXRecordDecl *CurDecl; 1009 if (SS && SS->isSet() && !SS->isInvalid()) { 1010 DeclContext *DC = computeDeclContext(*SS, true); 1011 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 1012 } else 1013 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1014 1015 if (CurDecl && CurDecl->getIdentifier()) 1016 return &II == CurDecl->getIdentifier(); 1017 else 1018 return false; 1019} 1020 1021/// \brief Check the validity of a C++ base class specifier. 1022/// 1023/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1024/// and returns NULL otherwise. 1025CXXBaseSpecifier * 1026Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1027 SourceRange SpecifierRange, 1028 bool Virtual, AccessSpecifier Access, 1029 TypeSourceInfo *TInfo, 1030 SourceLocation EllipsisLoc) { 1031 QualType BaseType = TInfo->getType(); 1032 1033 // C++ [class.union]p1: 1034 // A union shall not have base classes. 1035 if (Class->isUnion()) { 1036 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1037 << SpecifierRange; 1038 return 0; 1039 } 1040 1041 if (EllipsisLoc.isValid() && 1042 !TInfo->getType()->containsUnexpandedParameterPack()) { 1043 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1044 << TInfo->getTypeLoc().getSourceRange(); 1045 EllipsisLoc = SourceLocation(); 1046 } 1047 1048 if (BaseType->isDependentType()) 1049 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1050 Class->getTagKind() == TTK_Class, 1051 Access, TInfo, EllipsisLoc); 1052 1053 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1054 1055 // Base specifiers must be record types. 1056 if (!BaseType->isRecordType()) { 1057 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1058 return 0; 1059 } 1060 1061 // C++ [class.union]p1: 1062 // A union shall not be used as a base class. 1063 if (BaseType->isUnionType()) { 1064 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1065 return 0; 1066 } 1067 1068 // C++ [class.derived]p2: 1069 // The class-name in a base-specifier shall not be an incompletely 1070 // defined class. 1071 if (RequireCompleteType(BaseLoc, BaseType, 1072 diag::err_incomplete_base_class, SpecifierRange)) { 1073 Class->setInvalidDecl(); 1074 return 0; 1075 } 1076 1077 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1078 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1079 assert(BaseDecl && "Record type has no declaration"); 1080 BaseDecl = BaseDecl->getDefinition(); 1081 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1082 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1083 assert(CXXBaseDecl && "Base type is not a C++ type"); 1084 1085 // C++ [class]p3: 1086 // If a class is marked final and it appears as a base-type-specifier in 1087 // base-clause, the program is ill-formed. 1088 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1089 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1090 << CXXBaseDecl->getDeclName(); 1091 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1092 << CXXBaseDecl->getDeclName(); 1093 return 0; 1094 } 1095 1096 if (BaseDecl->isInvalidDecl()) 1097 Class->setInvalidDecl(); 1098 1099 // Create the base specifier. 1100 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1101 Class->getTagKind() == TTK_Class, 1102 Access, TInfo, EllipsisLoc); 1103} 1104 1105/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1106/// one entry in the base class list of a class specifier, for 1107/// example: 1108/// class foo : public bar, virtual private baz { 1109/// 'public bar' and 'virtual private baz' are each base-specifiers. 1110BaseResult 1111Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1112 bool Virtual, AccessSpecifier Access, 1113 ParsedType basetype, SourceLocation BaseLoc, 1114 SourceLocation EllipsisLoc) { 1115 if (!classdecl) 1116 return true; 1117 1118 AdjustDeclIfTemplate(classdecl); 1119 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1120 if (!Class) 1121 return true; 1122 1123 TypeSourceInfo *TInfo = 0; 1124 GetTypeFromParser(basetype, &TInfo); 1125 1126 if (EllipsisLoc.isInvalid() && 1127 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1128 UPPC_BaseType)) 1129 return true; 1130 1131 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1132 Virtual, Access, TInfo, 1133 EllipsisLoc)) 1134 return BaseSpec; 1135 else 1136 Class->setInvalidDecl(); 1137 1138 return true; 1139} 1140 1141/// \brief Performs the actual work of attaching the given base class 1142/// specifiers to a C++ class. 1143bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1144 unsigned NumBases) { 1145 if (NumBases == 0) 1146 return false; 1147 1148 // Used to keep track of which base types we have already seen, so 1149 // that we can properly diagnose redundant direct base types. Note 1150 // that the key is always the unqualified canonical type of the base 1151 // class. 1152 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1153 1154 // Copy non-redundant base specifiers into permanent storage. 1155 unsigned NumGoodBases = 0; 1156 bool Invalid = false; 1157 for (unsigned idx = 0; idx < NumBases; ++idx) { 1158 QualType NewBaseType 1159 = Context.getCanonicalType(Bases[idx]->getType()); 1160 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1161 1162 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1163 if (KnownBase) { 1164 // C++ [class.mi]p3: 1165 // A class shall not be specified as a direct base class of a 1166 // derived class more than once. 1167 Diag(Bases[idx]->getLocStart(), 1168 diag::err_duplicate_base_class) 1169 << KnownBase->getType() 1170 << Bases[idx]->getSourceRange(); 1171 1172 // Delete the duplicate base class specifier; we're going to 1173 // overwrite its pointer later. 1174 Context.Deallocate(Bases[idx]); 1175 1176 Invalid = true; 1177 } else { 1178 // Okay, add this new base class. 1179 KnownBase = Bases[idx]; 1180 Bases[NumGoodBases++] = Bases[idx]; 1181 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) { 1182 const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); 1183 if (Class->isInterface() && 1184 (!RD->isInterface() || 1185 KnownBase->getAccessSpecifier() != AS_public)) { 1186 // The Microsoft extension __interface does not permit bases that 1187 // are not themselves public interfaces. 1188 Diag(KnownBase->getLocStart(), diag::err_invalid_base_in_interface) 1189 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getName() 1190 << RD->getSourceRange(); 1191 Invalid = true; 1192 } 1193 if (RD->hasAttr<WeakAttr>()) 1194 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1195 } 1196 } 1197 } 1198 1199 // Attach the remaining base class specifiers to the derived class. 1200 Class->setBases(Bases, NumGoodBases); 1201 1202 // Delete the remaining (good) base class specifiers, since their 1203 // data has been copied into the CXXRecordDecl. 1204 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1205 Context.Deallocate(Bases[idx]); 1206 1207 return Invalid; 1208} 1209 1210/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1211/// class, after checking whether there are any duplicate base 1212/// classes. 1213void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1214 unsigned NumBases) { 1215 if (!ClassDecl || !Bases || !NumBases) 1216 return; 1217 1218 AdjustDeclIfTemplate(ClassDecl); 1219 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1220 (CXXBaseSpecifier**)(Bases), NumBases); 1221} 1222 1223static CXXRecordDecl *GetClassForType(QualType T) { 1224 if (const RecordType *RT = T->getAs<RecordType>()) 1225 return cast<CXXRecordDecl>(RT->getDecl()); 1226 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1227 return ICT->getDecl(); 1228 else 1229 return 0; 1230} 1231 1232/// \brief Determine whether the type \p Derived is a C++ class that is 1233/// derived from the type \p Base. 1234bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1235 if (!getLangOpts().CPlusPlus) 1236 return false; 1237 1238 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1239 if (!DerivedRD) 1240 return false; 1241 1242 CXXRecordDecl *BaseRD = GetClassForType(Base); 1243 if (!BaseRD) 1244 return false; 1245 1246 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1247 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1248} 1249 1250/// \brief Determine whether the type \p Derived is a C++ class that is 1251/// derived from the type \p Base. 1252bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1253 if (!getLangOpts().CPlusPlus) 1254 return false; 1255 1256 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1257 if (!DerivedRD) 1258 return false; 1259 1260 CXXRecordDecl *BaseRD = GetClassForType(Base); 1261 if (!BaseRD) 1262 return false; 1263 1264 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1265} 1266 1267void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1268 CXXCastPath &BasePathArray) { 1269 assert(BasePathArray.empty() && "Base path array must be empty!"); 1270 assert(Paths.isRecordingPaths() && "Must record paths!"); 1271 1272 const CXXBasePath &Path = Paths.front(); 1273 1274 // We first go backward and check if we have a virtual base. 1275 // FIXME: It would be better if CXXBasePath had the base specifier for 1276 // the nearest virtual base. 1277 unsigned Start = 0; 1278 for (unsigned I = Path.size(); I != 0; --I) { 1279 if (Path[I - 1].Base->isVirtual()) { 1280 Start = I - 1; 1281 break; 1282 } 1283 } 1284 1285 // Now add all bases. 1286 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1287 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1288} 1289 1290/// \brief Determine whether the given base path includes a virtual 1291/// base class. 1292bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1293 for (CXXCastPath::const_iterator B = BasePath.begin(), 1294 BEnd = BasePath.end(); 1295 B != BEnd; ++B) 1296 if ((*B)->isVirtual()) 1297 return true; 1298 1299 return false; 1300} 1301 1302/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1303/// conversion (where Derived and Base are class types) is 1304/// well-formed, meaning that the conversion is unambiguous (and 1305/// that all of the base classes are accessible). Returns true 1306/// and emits a diagnostic if the code is ill-formed, returns false 1307/// otherwise. Loc is the location where this routine should point to 1308/// if there is an error, and Range is the source range to highlight 1309/// if there is an error. 1310bool 1311Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1312 unsigned InaccessibleBaseID, 1313 unsigned AmbigiousBaseConvID, 1314 SourceLocation Loc, SourceRange Range, 1315 DeclarationName Name, 1316 CXXCastPath *BasePath) { 1317 // First, determine whether the path from Derived to Base is 1318 // ambiguous. This is slightly more expensive than checking whether 1319 // the Derived to Base conversion exists, because here we need to 1320 // explore multiple paths to determine if there is an ambiguity. 1321 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1322 /*DetectVirtual=*/false); 1323 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1324 assert(DerivationOkay && 1325 "Can only be used with a derived-to-base conversion"); 1326 (void)DerivationOkay; 1327 1328 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1329 if (InaccessibleBaseID) { 1330 // Check that the base class can be accessed. 1331 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1332 InaccessibleBaseID)) { 1333 case AR_inaccessible: 1334 return true; 1335 case AR_accessible: 1336 case AR_dependent: 1337 case AR_delayed: 1338 break; 1339 } 1340 } 1341 1342 // Build a base path if necessary. 1343 if (BasePath) 1344 BuildBasePathArray(Paths, *BasePath); 1345 return false; 1346 } 1347 1348 // We know that the derived-to-base conversion is ambiguous, and 1349 // we're going to produce a diagnostic. Perform the derived-to-base 1350 // search just one more time to compute all of the possible paths so 1351 // that we can print them out. This is more expensive than any of 1352 // the previous derived-to-base checks we've done, but at this point 1353 // performance isn't as much of an issue. 1354 Paths.clear(); 1355 Paths.setRecordingPaths(true); 1356 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1357 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1358 (void)StillOkay; 1359 1360 // Build up a textual representation of the ambiguous paths, e.g., 1361 // D -> B -> A, that will be used to illustrate the ambiguous 1362 // conversions in the diagnostic. We only print one of the paths 1363 // to each base class subobject. 1364 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1365 1366 Diag(Loc, AmbigiousBaseConvID) 1367 << Derived << Base << PathDisplayStr << Range << Name; 1368 return true; 1369} 1370 1371bool 1372Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1373 SourceLocation Loc, SourceRange Range, 1374 CXXCastPath *BasePath, 1375 bool IgnoreAccess) { 1376 return CheckDerivedToBaseConversion(Derived, Base, 1377 IgnoreAccess ? 0 1378 : diag::err_upcast_to_inaccessible_base, 1379 diag::err_ambiguous_derived_to_base_conv, 1380 Loc, Range, DeclarationName(), 1381 BasePath); 1382} 1383 1384 1385/// @brief Builds a string representing ambiguous paths from a 1386/// specific derived class to different subobjects of the same base 1387/// class. 1388/// 1389/// This function builds a string that can be used in error messages 1390/// to show the different paths that one can take through the 1391/// inheritance hierarchy to go from the derived class to different 1392/// subobjects of a base class. The result looks something like this: 1393/// @code 1394/// struct D -> struct B -> struct A 1395/// struct D -> struct C -> struct A 1396/// @endcode 1397std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1398 std::string PathDisplayStr; 1399 std::set<unsigned> DisplayedPaths; 1400 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1401 Path != Paths.end(); ++Path) { 1402 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1403 // We haven't displayed a path to this particular base 1404 // class subobject yet. 1405 PathDisplayStr += "\n "; 1406 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1407 for (CXXBasePath::const_iterator Element = Path->begin(); 1408 Element != Path->end(); ++Element) 1409 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1410 } 1411 } 1412 1413 return PathDisplayStr; 1414} 1415 1416//===----------------------------------------------------------------------===// 1417// C++ class member Handling 1418//===----------------------------------------------------------------------===// 1419 1420/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1421bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1422 SourceLocation ASLoc, 1423 SourceLocation ColonLoc, 1424 AttributeList *Attrs) { 1425 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1426 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1427 ASLoc, ColonLoc); 1428 CurContext->addHiddenDecl(ASDecl); 1429 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1430} 1431 1432/// CheckOverrideControl - Check C++11 override control semantics. 1433void Sema::CheckOverrideControl(Decl *D) { 1434 if (D->isInvalidDecl()) 1435 return; 1436 1437 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1438 1439 // Do we know which functions this declaration might be overriding? 1440 bool OverridesAreKnown = !MD || 1441 (!MD->getParent()->hasAnyDependentBases() && 1442 !MD->getType()->isDependentType()); 1443 1444 if (!MD || !MD->isVirtual()) { 1445 if (OverridesAreKnown) { 1446 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1447 Diag(OA->getLocation(), 1448 diag::override_keyword_only_allowed_on_virtual_member_functions) 1449 << "override" << FixItHint::CreateRemoval(OA->getLocation()); 1450 D->dropAttr<OverrideAttr>(); 1451 } 1452 if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1453 Diag(FA->getLocation(), 1454 diag::override_keyword_only_allowed_on_virtual_member_functions) 1455 << "final" << FixItHint::CreateRemoval(FA->getLocation()); 1456 D->dropAttr<FinalAttr>(); 1457 } 1458 } 1459 return; 1460 } 1461 1462 if (!OverridesAreKnown) 1463 return; 1464 1465 // C++11 [class.virtual]p5: 1466 // If a virtual function is marked with the virt-specifier override and 1467 // does not override a member function of a base class, the program is 1468 // ill-formed. 1469 bool HasOverriddenMethods = 1470 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1471 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) 1472 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) 1473 << MD->getDeclName(); 1474} 1475 1476/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1477/// function overrides a virtual member function marked 'final', according to 1478/// C++11 [class.virtual]p4. 1479bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1480 const CXXMethodDecl *Old) { 1481 if (!Old->hasAttr<FinalAttr>()) 1482 return false; 1483 1484 Diag(New->getLocation(), diag::err_final_function_overridden) 1485 << New->getDeclName(); 1486 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1487 return true; 1488} 1489 1490static bool InitializationHasSideEffects(const FieldDecl &FD) { 1491 const Type *T = FD.getType()->getBaseElementTypeUnsafe(); 1492 // FIXME: Destruction of ObjC lifetime types has side-effects. 1493 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) 1494 return !RD->isCompleteDefinition() || 1495 !RD->hasTrivialDefaultConstructor() || 1496 !RD->hasTrivialDestructor(); 1497 return false; 1498} 1499 1500/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1501/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1502/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1503/// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1504/// present (but parsing it has been deferred). 1505Decl * 1506Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1507 MultiTemplateParamsArg TemplateParameterLists, 1508 Expr *BW, const VirtSpecifiers &VS, 1509 InClassInitStyle InitStyle) { 1510 const DeclSpec &DS = D.getDeclSpec(); 1511 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1512 DeclarationName Name = NameInfo.getName(); 1513 SourceLocation Loc = NameInfo.getLoc(); 1514 1515 // For anonymous bitfields, the location should point to the type. 1516 if (Loc.isInvalid()) 1517 Loc = D.getLocStart(); 1518 1519 Expr *BitWidth = static_cast<Expr*>(BW); 1520 1521 assert(isa<CXXRecordDecl>(CurContext)); 1522 assert(!DS.isFriendSpecified()); 1523 1524 bool isFunc = D.isDeclarationOfFunction(); 1525 1526 if (cast<CXXRecordDecl>(CurContext)->isInterface()) { 1527 // The Microsoft extension __interface only permits public member functions 1528 // and prohibits constructors, destructors, operators, non-public member 1529 // functions, static methods and data members. 1530 unsigned InvalidDecl; 1531 bool ShowDeclName = true; 1532 if (!isFunc) 1533 InvalidDecl = (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) ? 0 : 1; 1534 else if (AS != AS_public) 1535 InvalidDecl = 2; 1536 else if (DS.getStorageClassSpec() == DeclSpec::SCS_static) 1537 InvalidDecl = 3; 1538 else switch (Name.getNameKind()) { 1539 case DeclarationName::CXXConstructorName: 1540 InvalidDecl = 4; 1541 ShowDeclName = false; 1542 break; 1543 1544 case DeclarationName::CXXDestructorName: 1545 InvalidDecl = 5; 1546 ShowDeclName = false; 1547 break; 1548 1549 case DeclarationName::CXXOperatorName: 1550 case DeclarationName::CXXConversionFunctionName: 1551 InvalidDecl = 6; 1552 break; 1553 1554 default: 1555 InvalidDecl = 0; 1556 break; 1557 } 1558 1559 if (InvalidDecl) { 1560 if (ShowDeclName) 1561 Diag(Loc, diag::err_invalid_member_in_interface) 1562 << (InvalidDecl-1) << Name; 1563 else 1564 Diag(Loc, diag::err_invalid_member_in_interface) 1565 << (InvalidDecl-1) << ""; 1566 return 0; 1567 } 1568 } 1569 1570 // C++ 9.2p6: A member shall not be declared to have automatic storage 1571 // duration (auto, register) or with the extern storage-class-specifier. 1572 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1573 // data members and cannot be applied to names declared const or static, 1574 // and cannot be applied to reference members. 1575 switch (DS.getStorageClassSpec()) { 1576 case DeclSpec::SCS_unspecified: 1577 case DeclSpec::SCS_typedef: 1578 case DeclSpec::SCS_static: 1579 // FALL THROUGH. 1580 break; 1581 case DeclSpec::SCS_mutable: 1582 if (isFunc) { 1583 if (DS.getStorageClassSpecLoc().isValid()) 1584 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1585 else 1586 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1587 1588 // FIXME: It would be nicer if the keyword was ignored only for this 1589 // declarator. Otherwise we could get follow-up errors. 1590 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1591 } 1592 break; 1593 default: 1594 if (DS.getStorageClassSpecLoc().isValid()) 1595 Diag(DS.getStorageClassSpecLoc(), 1596 diag::err_storageclass_invalid_for_member); 1597 else 1598 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1599 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1600 } 1601 1602 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1603 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1604 !isFunc); 1605 1606 Decl *Member; 1607 if (isInstField) { 1608 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1609 1610 // Data members must have identifiers for names. 1611 if (!Name.isIdentifier()) { 1612 Diag(Loc, diag::err_bad_variable_name) 1613 << Name; 1614 return 0; 1615 } 1616 1617 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1618 1619 // Member field could not be with "template" keyword. 1620 // So TemplateParameterLists should be empty in this case. 1621 if (TemplateParameterLists.size()) { 1622 TemplateParameterList* TemplateParams = TemplateParameterLists[0]; 1623 if (TemplateParams->size()) { 1624 // There is no such thing as a member field template. 1625 Diag(D.getIdentifierLoc(), diag::err_template_member) 1626 << II 1627 << SourceRange(TemplateParams->getTemplateLoc(), 1628 TemplateParams->getRAngleLoc()); 1629 } else { 1630 // There is an extraneous 'template<>' for this member. 1631 Diag(TemplateParams->getTemplateLoc(), 1632 diag::err_template_member_noparams) 1633 << II 1634 << SourceRange(TemplateParams->getTemplateLoc(), 1635 TemplateParams->getRAngleLoc()); 1636 } 1637 return 0; 1638 } 1639 1640 if (SS.isSet() && !SS.isInvalid()) { 1641 // The user provided a superfluous scope specifier inside a class 1642 // definition: 1643 // 1644 // class X { 1645 // int X::member; 1646 // }; 1647 if (DeclContext *DC = computeDeclContext(SS, false)) 1648 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1649 else 1650 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1651 << Name << SS.getRange(); 1652 1653 SS.clear(); 1654 } 1655 1656 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1657 InitStyle, AS); 1658 assert(Member && "HandleField never returns null"); 1659 } else { 1660 assert(InitStyle == ICIS_NoInit); 1661 1662 Member = HandleDeclarator(S, D, TemplateParameterLists); 1663 if (!Member) { 1664 return 0; 1665 } 1666 1667 // Non-instance-fields can't have a bitfield. 1668 if (BitWidth) { 1669 if (Member->isInvalidDecl()) { 1670 // don't emit another diagnostic. 1671 } else if (isa<VarDecl>(Member)) { 1672 // C++ 9.6p3: A bit-field shall not be a static member. 1673 // "static member 'A' cannot be a bit-field" 1674 Diag(Loc, diag::err_static_not_bitfield) 1675 << Name << BitWidth->getSourceRange(); 1676 } else if (isa<TypedefDecl>(Member)) { 1677 // "typedef member 'x' cannot be a bit-field" 1678 Diag(Loc, diag::err_typedef_not_bitfield) 1679 << Name << BitWidth->getSourceRange(); 1680 } else { 1681 // A function typedef ("typedef int f(); f a;"). 1682 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1683 Diag(Loc, diag::err_not_integral_type_bitfield) 1684 << Name << cast<ValueDecl>(Member)->getType() 1685 << BitWidth->getSourceRange(); 1686 } 1687 1688 BitWidth = 0; 1689 Member->setInvalidDecl(); 1690 } 1691 1692 Member->setAccess(AS); 1693 1694 // If we have declared a member function template, set the access of the 1695 // templated declaration as well. 1696 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1697 FunTmpl->getTemplatedDecl()->setAccess(AS); 1698 } 1699 1700 if (VS.isOverrideSpecified()) 1701 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1702 if (VS.isFinalSpecified()) 1703 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1704 1705 if (VS.getLastLocation().isValid()) { 1706 // Update the end location of a method that has a virt-specifiers. 1707 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1708 MD->setRangeEnd(VS.getLastLocation()); 1709 } 1710 1711 CheckOverrideControl(Member); 1712 1713 assert((Name || isInstField) && "No identifier for non-field ?"); 1714 1715 if (isInstField) { 1716 FieldDecl *FD = cast<FieldDecl>(Member); 1717 FieldCollector->Add(FD); 1718 1719 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 1720 FD->getLocation()) 1721 != DiagnosticsEngine::Ignored) { 1722 // Remember all explicit private FieldDecls that have a name, no side 1723 // effects and are not part of a dependent type declaration. 1724 if (!FD->isImplicit() && FD->getDeclName() && 1725 FD->getAccess() == AS_private && 1726 !FD->hasAttr<UnusedAttr>() && 1727 !FD->getParent()->isDependentContext() && 1728 !InitializationHasSideEffects(*FD)) 1729 UnusedPrivateFields.insert(FD); 1730 } 1731 } 1732 1733 return Member; 1734} 1735 1736namespace { 1737 class UninitializedFieldVisitor 1738 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 1739 Sema &S; 1740 ValueDecl *VD; 1741 public: 1742 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 1743 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context), 1744 S(S), VD(VD) { 1745 } 1746 1747 void HandleExpr(Expr *E) { 1748 if (!E) return; 1749 1750 // Expressions like x(x) sometimes lack the surrounding expressions 1751 // but need to be checked anyways. 1752 HandleValue(E); 1753 Visit(E); 1754 } 1755 1756 void HandleValue(Expr *E) { 1757 E = E->IgnoreParens(); 1758 1759 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 1760 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 1761 return; 1762 Expr *Base = E; 1763 while (isa<MemberExpr>(Base)) { 1764 ME = dyn_cast<MemberExpr>(Base); 1765 if (VarDecl *VarD = dyn_cast<VarDecl>(ME->getMemberDecl())) 1766 if (VarD->hasGlobalStorage()) 1767 return; 1768 Base = ME->getBase(); 1769 } 1770 1771 if (VD == ME->getMemberDecl() && isa<CXXThisExpr>(Base)) { 1772 unsigned diag = VD->getType()->isReferenceType() 1773 ? diag::warn_reference_field_is_uninit 1774 : diag::warn_field_is_uninit; 1775 S.Diag(ME->getExprLoc(), diag) << ME->getMemberNameInfo().getName(); 1776 return; 1777 } 1778 } 1779 1780 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 1781 HandleValue(CO->getTrueExpr()); 1782 HandleValue(CO->getFalseExpr()); 1783 return; 1784 } 1785 1786 if (BinaryConditionalOperator *BCO = 1787 dyn_cast<BinaryConditionalOperator>(E)) { 1788 HandleValue(BCO->getCommon()); 1789 HandleValue(BCO->getFalseExpr()); 1790 return; 1791 } 1792 1793 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 1794 switch (BO->getOpcode()) { 1795 default: 1796 return; 1797 case(BO_PtrMemD): 1798 case(BO_PtrMemI): 1799 HandleValue(BO->getLHS()); 1800 return; 1801 case(BO_Comma): 1802 HandleValue(BO->getRHS()); 1803 return; 1804 } 1805 } 1806 } 1807 1808 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 1809 if (E->getCastKind() == CK_LValueToRValue) 1810 HandleValue(E->getSubExpr()); 1811 1812 Inherited::VisitImplicitCastExpr(E); 1813 } 1814 1815 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 1816 Expr *Callee = E->getCallee(); 1817 if (isa<MemberExpr>(Callee)) 1818 HandleValue(Callee); 1819 1820 Inherited::VisitCXXMemberCallExpr(E); 1821 } 1822 }; 1823 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E, 1824 ValueDecl *VD) { 1825 UninitializedFieldVisitor(S, VD).HandleExpr(E); 1826 } 1827} // namespace 1828 1829/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1830/// in-class initializer for a non-static C++ class member, and after 1831/// instantiating an in-class initializer in a class template. Such actions 1832/// are deferred until the class is complete. 1833void 1834Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 1835 Expr *InitExpr) { 1836 FieldDecl *FD = cast<FieldDecl>(D); 1837 assert(FD->getInClassInitStyle() != ICIS_NoInit && 1838 "must set init style when field is created"); 1839 1840 if (!InitExpr) { 1841 FD->setInvalidDecl(); 1842 FD->removeInClassInitializer(); 1843 return; 1844 } 1845 1846 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1847 FD->setInvalidDecl(); 1848 FD->removeInClassInitializer(); 1849 return; 1850 } 1851 1852 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, InitLoc) 1853 != DiagnosticsEngine::Ignored) { 1854 CheckInitExprContainsUninitializedFields(*this, InitExpr, FD); 1855 } 1856 1857 ExprResult Init = InitExpr; 1858 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent() && 1859 !FD->getDeclContext()->isDependentContext()) { 1860 // Note: We don't type-check when we're in a dependent context, because 1861 // the initialization-substitution code does not properly handle direct 1862 // list initialization. We have the same hackaround for ctor-initializers. 1863 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1864 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1865 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1866 } 1867 Expr **Inits = &InitExpr; 1868 unsigned NumInits = 1; 1869 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1870 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 1871 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1872 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 1873 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 1874 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 1875 if (Init.isInvalid()) { 1876 FD->setInvalidDecl(); 1877 return; 1878 } 1879 1880 CheckImplicitConversions(Init.get(), InitLoc); 1881 } 1882 1883 // C++0x [class.base.init]p7: 1884 // The initialization of each base and member constitutes a 1885 // full-expression. 1886 Init = MaybeCreateExprWithCleanups(Init); 1887 if (Init.isInvalid()) { 1888 FD->setInvalidDecl(); 1889 return; 1890 } 1891 1892 InitExpr = Init.release(); 1893 1894 FD->setInClassInitializer(InitExpr); 1895} 1896 1897/// \brief Find the direct and/or virtual base specifiers that 1898/// correspond to the given base type, for use in base initialization 1899/// within a constructor. 1900static bool FindBaseInitializer(Sema &SemaRef, 1901 CXXRecordDecl *ClassDecl, 1902 QualType BaseType, 1903 const CXXBaseSpecifier *&DirectBaseSpec, 1904 const CXXBaseSpecifier *&VirtualBaseSpec) { 1905 // First, check for a direct base class. 1906 DirectBaseSpec = 0; 1907 for (CXXRecordDecl::base_class_const_iterator Base 1908 = ClassDecl->bases_begin(); 1909 Base != ClassDecl->bases_end(); ++Base) { 1910 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1911 // We found a direct base of this type. That's what we're 1912 // initializing. 1913 DirectBaseSpec = &*Base; 1914 break; 1915 } 1916 } 1917 1918 // Check for a virtual base class. 1919 // FIXME: We might be able to short-circuit this if we know in advance that 1920 // there are no virtual bases. 1921 VirtualBaseSpec = 0; 1922 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1923 // We haven't found a base yet; search the class hierarchy for a 1924 // virtual base class. 1925 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1926 /*DetectVirtual=*/false); 1927 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1928 BaseType, Paths)) { 1929 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1930 Path != Paths.end(); ++Path) { 1931 if (Path->back().Base->isVirtual()) { 1932 VirtualBaseSpec = Path->back().Base; 1933 break; 1934 } 1935 } 1936 } 1937 } 1938 1939 return DirectBaseSpec || VirtualBaseSpec; 1940} 1941 1942/// \brief Handle a C++ member initializer using braced-init-list syntax. 1943MemInitResult 1944Sema::ActOnMemInitializer(Decl *ConstructorD, 1945 Scope *S, 1946 CXXScopeSpec &SS, 1947 IdentifierInfo *MemberOrBase, 1948 ParsedType TemplateTypeTy, 1949 const DeclSpec &DS, 1950 SourceLocation IdLoc, 1951 Expr *InitList, 1952 SourceLocation EllipsisLoc) { 1953 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1954 DS, IdLoc, InitList, 1955 EllipsisLoc); 1956} 1957 1958/// \brief Handle a C++ member initializer using parentheses syntax. 1959MemInitResult 1960Sema::ActOnMemInitializer(Decl *ConstructorD, 1961 Scope *S, 1962 CXXScopeSpec &SS, 1963 IdentifierInfo *MemberOrBase, 1964 ParsedType TemplateTypeTy, 1965 const DeclSpec &DS, 1966 SourceLocation IdLoc, 1967 SourceLocation LParenLoc, 1968 Expr **Args, unsigned NumArgs, 1969 SourceLocation RParenLoc, 1970 SourceLocation EllipsisLoc) { 1971 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, 1972 llvm::makeArrayRef(Args, NumArgs), 1973 RParenLoc); 1974 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1975 DS, IdLoc, List, EllipsisLoc); 1976} 1977 1978namespace { 1979 1980// Callback to only accept typo corrections that can be a valid C++ member 1981// intializer: either a non-static field member or a base class. 1982class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1983 public: 1984 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1985 : ClassDecl(ClassDecl) {} 1986 1987 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1988 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1989 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1990 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1991 else 1992 return isa<TypeDecl>(ND); 1993 } 1994 return false; 1995 } 1996 1997 private: 1998 CXXRecordDecl *ClassDecl; 1999}; 2000 2001} 2002 2003/// \brief Handle a C++ member initializer. 2004MemInitResult 2005Sema::BuildMemInitializer(Decl *ConstructorD, 2006 Scope *S, 2007 CXXScopeSpec &SS, 2008 IdentifierInfo *MemberOrBase, 2009 ParsedType TemplateTypeTy, 2010 const DeclSpec &DS, 2011 SourceLocation IdLoc, 2012 Expr *Init, 2013 SourceLocation EllipsisLoc) { 2014 if (!ConstructorD) 2015 return true; 2016 2017 AdjustDeclIfTemplate(ConstructorD); 2018 2019 CXXConstructorDecl *Constructor 2020 = dyn_cast<CXXConstructorDecl>(ConstructorD); 2021 if (!Constructor) { 2022 // The user wrote a constructor initializer on a function that is 2023 // not a C++ constructor. Ignore the error for now, because we may 2024 // have more member initializers coming; we'll diagnose it just 2025 // once in ActOnMemInitializers. 2026 return true; 2027 } 2028 2029 CXXRecordDecl *ClassDecl = Constructor->getParent(); 2030 2031 // C++ [class.base.init]p2: 2032 // Names in a mem-initializer-id are looked up in the scope of the 2033 // constructor's class and, if not found in that scope, are looked 2034 // up in the scope containing the constructor's definition. 2035 // [Note: if the constructor's class contains a member with the 2036 // same name as a direct or virtual base class of the class, a 2037 // mem-initializer-id naming the member or base class and composed 2038 // of a single identifier refers to the class member. A 2039 // mem-initializer-id for the hidden base class may be specified 2040 // using a qualified name. ] 2041 if (!SS.getScopeRep() && !TemplateTypeTy) { 2042 // Look for a member, first. 2043 DeclContext::lookup_result Result 2044 = ClassDecl->lookup(MemberOrBase); 2045 if (Result.first != Result.second) { 2046 ValueDecl *Member; 2047 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 2048 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 2049 if (EllipsisLoc.isValid()) 2050 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 2051 << MemberOrBase 2052 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 2053 2054 return BuildMemberInitializer(Member, Init, IdLoc); 2055 } 2056 } 2057 } 2058 // It didn't name a member, so see if it names a class. 2059 QualType BaseType; 2060 TypeSourceInfo *TInfo = 0; 2061 2062 if (TemplateTypeTy) { 2063 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 2064 } else if (DS.getTypeSpecType() == TST_decltype) { 2065 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 2066 } else { 2067 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 2068 LookupParsedName(R, S, &SS); 2069 2070 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 2071 if (!TyD) { 2072 if (R.isAmbiguous()) return true; 2073 2074 // We don't want access-control diagnostics here. 2075 R.suppressDiagnostics(); 2076 2077 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 2078 bool NotUnknownSpecialization = false; 2079 DeclContext *DC = computeDeclContext(SS, false); 2080 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 2081 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 2082 2083 if (!NotUnknownSpecialization) { 2084 // When the scope specifier can refer to a member of an unknown 2085 // specialization, we take it as a type name. 2086 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 2087 SS.getWithLocInContext(Context), 2088 *MemberOrBase, IdLoc); 2089 if (BaseType.isNull()) 2090 return true; 2091 2092 R.clear(); 2093 R.setLookupName(MemberOrBase); 2094 } 2095 } 2096 2097 // If no results were found, try to correct typos. 2098 TypoCorrection Corr; 2099 MemInitializerValidatorCCC Validator(ClassDecl); 2100 if (R.empty() && BaseType.isNull() && 2101 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 2102 Validator, ClassDecl))) { 2103 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 2104 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 2105 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 2106 // We have found a non-static data member with a similar 2107 // name to what was typed; complain and initialize that 2108 // member. 2109 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2110 << MemberOrBase << true << CorrectedQuotedStr 2111 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2112 Diag(Member->getLocation(), diag::note_previous_decl) 2113 << CorrectedQuotedStr; 2114 2115 return BuildMemberInitializer(Member, Init, IdLoc); 2116 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 2117 const CXXBaseSpecifier *DirectBaseSpec; 2118 const CXXBaseSpecifier *VirtualBaseSpec; 2119 if (FindBaseInitializer(*this, ClassDecl, 2120 Context.getTypeDeclType(Type), 2121 DirectBaseSpec, VirtualBaseSpec)) { 2122 // We have found a direct or virtual base class with a 2123 // similar name to what was typed; complain and initialize 2124 // that base class. 2125 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2126 << MemberOrBase << false << CorrectedQuotedStr 2127 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2128 2129 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 2130 : VirtualBaseSpec; 2131 Diag(BaseSpec->getLocStart(), 2132 diag::note_base_class_specified_here) 2133 << BaseSpec->getType() 2134 << BaseSpec->getSourceRange(); 2135 2136 TyD = Type; 2137 } 2138 } 2139 } 2140 2141 if (!TyD && BaseType.isNull()) { 2142 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 2143 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 2144 return true; 2145 } 2146 } 2147 2148 if (BaseType.isNull()) { 2149 BaseType = Context.getTypeDeclType(TyD); 2150 if (SS.isSet()) { 2151 NestedNameSpecifier *Qualifier = 2152 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2153 2154 // FIXME: preserve source range information 2155 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 2156 } 2157 } 2158 } 2159 2160 if (!TInfo) 2161 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 2162 2163 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 2164} 2165 2166/// Checks a member initializer expression for cases where reference (or 2167/// pointer) members are bound to by-value parameters (or their addresses). 2168static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 2169 Expr *Init, 2170 SourceLocation IdLoc) { 2171 QualType MemberTy = Member->getType(); 2172 2173 // We only handle pointers and references currently. 2174 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 2175 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 2176 return; 2177 2178 const bool IsPointer = MemberTy->isPointerType(); 2179 if (IsPointer) { 2180 if (const UnaryOperator *Op 2181 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2182 // The only case we're worried about with pointers requires taking the 2183 // address. 2184 if (Op->getOpcode() != UO_AddrOf) 2185 return; 2186 2187 Init = Op->getSubExpr(); 2188 } else { 2189 // We only handle address-of expression initializers for pointers. 2190 return; 2191 } 2192 } 2193 2194 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 2195 // Taking the address of a temporary will be diagnosed as a hard error. 2196 if (IsPointer) 2197 return; 2198 2199 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 2200 << Member << Init->getSourceRange(); 2201 } else if (const DeclRefExpr *DRE 2202 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2203 // We only warn when referring to a non-reference parameter declaration. 2204 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2205 if (!Parameter || Parameter->getType()->isReferenceType()) 2206 return; 2207 2208 S.Diag(Init->getExprLoc(), 2209 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2210 : diag::warn_bind_ref_member_to_parameter) 2211 << Member << Parameter << Init->getSourceRange(); 2212 } else { 2213 // Other initializers are fine. 2214 return; 2215 } 2216 2217 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2218 << (unsigned)IsPointer; 2219} 2220 2221MemInitResult 2222Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2223 SourceLocation IdLoc) { 2224 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2225 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2226 assert((DirectMember || IndirectMember) && 2227 "Member must be a FieldDecl or IndirectFieldDecl"); 2228 2229 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2230 return true; 2231 2232 if (Member->isInvalidDecl()) 2233 return true; 2234 2235 // Diagnose value-uses of fields to initialize themselves, e.g. 2236 // foo(foo) 2237 // where foo is not also a parameter to the constructor. 2238 // TODO: implement -Wuninitialized and fold this into that framework. 2239 Expr **Args; 2240 unsigned NumArgs; 2241 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2242 Args = ParenList->getExprs(); 2243 NumArgs = ParenList->getNumExprs(); 2244 } else { 2245 InitListExpr *InitList = cast<InitListExpr>(Init); 2246 Args = InitList->getInits(); 2247 NumArgs = InitList->getNumInits(); 2248 } 2249 2250 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc) 2251 != DiagnosticsEngine::Ignored) 2252 for (unsigned i = 0; i < NumArgs; ++i) 2253 // FIXME: Warn about the case when other fields are used before being 2254 // initialized. For example, let this field be the i'th field. When 2255 // initializing the i'th field, throw a warning if any of the >= i'th 2256 // fields are used, as they are not yet initialized. 2257 // Right now we are only handling the case where the i'th field uses 2258 // itself in its initializer. 2259 // Also need to take into account that some fields may be initialized by 2260 // in-class initializers, see C++11 [class.base.init]p9. 2261 CheckInitExprContainsUninitializedFields(*this, Args[i], Member); 2262 2263 SourceRange InitRange = Init->getSourceRange(); 2264 2265 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2266 // Can't check initialization for a member of dependent type or when 2267 // any of the arguments are type-dependent expressions. 2268 DiscardCleanupsInEvaluationContext(); 2269 } else { 2270 bool InitList = false; 2271 if (isa<InitListExpr>(Init)) { 2272 InitList = true; 2273 Args = &Init; 2274 NumArgs = 1; 2275 2276 if (isStdInitializerList(Member->getType(), 0)) { 2277 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2278 << /*at end of ctor*/1 << InitRange; 2279 } 2280 } 2281 2282 // Initialize the member. 2283 InitializedEntity MemberEntity = 2284 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2285 : InitializedEntity::InitializeMember(IndirectMember, 0); 2286 InitializationKind Kind = 2287 InitList ? InitializationKind::CreateDirectList(IdLoc) 2288 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2289 InitRange.getEnd()); 2290 2291 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2292 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2293 MultiExprArg(Args, NumArgs), 2294 0); 2295 if (MemberInit.isInvalid()) 2296 return true; 2297 2298 CheckImplicitConversions(MemberInit.get(), 2299 InitRange.getBegin()); 2300 2301 // C++0x [class.base.init]p7: 2302 // The initialization of each base and member constitutes a 2303 // full-expression. 2304 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2305 if (MemberInit.isInvalid()) 2306 return true; 2307 2308 // If we are in a dependent context, template instantiation will 2309 // perform this type-checking again. Just save the arguments that we 2310 // received. 2311 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2312 // of the information that we have about the member 2313 // initializer. However, deconstructing the ASTs is a dicey process, 2314 // and this approach is far more likely to get the corner cases right. 2315 if (CurContext->isDependentContext()) { 2316 // The existing Init will do fine. 2317 } else { 2318 Init = MemberInit.get(); 2319 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2320 } 2321 } 2322 2323 if (DirectMember) { 2324 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2325 InitRange.getBegin(), Init, 2326 InitRange.getEnd()); 2327 } else { 2328 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2329 InitRange.getBegin(), Init, 2330 InitRange.getEnd()); 2331 } 2332} 2333 2334MemInitResult 2335Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2336 CXXRecordDecl *ClassDecl) { 2337 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2338 if (!LangOpts.CPlusPlus0x) 2339 return Diag(NameLoc, diag::err_delegating_ctor) 2340 << TInfo->getTypeLoc().getLocalSourceRange(); 2341 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2342 2343 bool InitList = true; 2344 Expr **Args = &Init; 2345 unsigned NumArgs = 1; 2346 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2347 InitList = false; 2348 Args = ParenList->getExprs(); 2349 NumArgs = ParenList->getNumExprs(); 2350 } 2351 2352 SourceRange InitRange = Init->getSourceRange(); 2353 // Initialize the object. 2354 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2355 QualType(ClassDecl->getTypeForDecl(), 0)); 2356 InitializationKind Kind = 2357 InitList ? InitializationKind::CreateDirectList(NameLoc) 2358 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2359 InitRange.getEnd()); 2360 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2361 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2362 MultiExprArg(Args, NumArgs), 2363 0); 2364 if (DelegationInit.isInvalid()) 2365 return true; 2366 2367 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2368 "Delegating constructor with no target?"); 2369 2370 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2371 2372 // C++0x [class.base.init]p7: 2373 // The initialization of each base and member constitutes a 2374 // full-expression. 2375 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2376 if (DelegationInit.isInvalid()) 2377 return true; 2378 2379 // If we are in a dependent context, template instantiation will 2380 // perform this type-checking again. Just save the arguments that we 2381 // received in a ParenListExpr. 2382 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2383 // of the information that we have about the base 2384 // initializer. However, deconstructing the ASTs is a dicey process, 2385 // and this approach is far more likely to get the corner cases right. 2386 if (CurContext->isDependentContext()) 2387 DelegationInit = Owned(Init); 2388 2389 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2390 DelegationInit.takeAs<Expr>(), 2391 InitRange.getEnd()); 2392} 2393 2394MemInitResult 2395Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2396 Expr *Init, CXXRecordDecl *ClassDecl, 2397 SourceLocation EllipsisLoc) { 2398 SourceLocation BaseLoc 2399 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2400 2401 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2402 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2403 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2404 2405 // C++ [class.base.init]p2: 2406 // [...] Unless the mem-initializer-id names a nonstatic data 2407 // member of the constructor's class or a direct or virtual base 2408 // of that class, the mem-initializer is ill-formed. A 2409 // mem-initializer-list can initialize a base class using any 2410 // name that denotes that base class type. 2411 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2412 2413 SourceRange InitRange = Init->getSourceRange(); 2414 if (EllipsisLoc.isValid()) { 2415 // This is a pack expansion. 2416 if (!BaseType->containsUnexpandedParameterPack()) { 2417 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2418 << SourceRange(BaseLoc, InitRange.getEnd()); 2419 2420 EllipsisLoc = SourceLocation(); 2421 } 2422 } else { 2423 // Check for any unexpanded parameter packs. 2424 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2425 return true; 2426 2427 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2428 return true; 2429 } 2430 2431 // Check for direct and virtual base classes. 2432 const CXXBaseSpecifier *DirectBaseSpec = 0; 2433 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2434 if (!Dependent) { 2435 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2436 BaseType)) 2437 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2438 2439 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2440 VirtualBaseSpec); 2441 2442 // C++ [base.class.init]p2: 2443 // Unless the mem-initializer-id names a nonstatic data member of the 2444 // constructor's class or a direct or virtual base of that class, the 2445 // mem-initializer is ill-formed. 2446 if (!DirectBaseSpec && !VirtualBaseSpec) { 2447 // If the class has any dependent bases, then it's possible that 2448 // one of those types will resolve to the same type as 2449 // BaseType. Therefore, just treat this as a dependent base 2450 // class initialization. FIXME: Should we try to check the 2451 // initialization anyway? It seems odd. 2452 if (ClassDecl->hasAnyDependentBases()) 2453 Dependent = true; 2454 else 2455 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2456 << BaseType << Context.getTypeDeclType(ClassDecl) 2457 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2458 } 2459 } 2460 2461 if (Dependent) { 2462 DiscardCleanupsInEvaluationContext(); 2463 2464 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2465 /*IsVirtual=*/false, 2466 InitRange.getBegin(), Init, 2467 InitRange.getEnd(), EllipsisLoc); 2468 } 2469 2470 // C++ [base.class.init]p2: 2471 // If a mem-initializer-id is ambiguous because it designates both 2472 // a direct non-virtual base class and an inherited virtual base 2473 // class, the mem-initializer is ill-formed. 2474 if (DirectBaseSpec && VirtualBaseSpec) 2475 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2476 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2477 2478 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2479 if (!BaseSpec) 2480 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2481 2482 // Initialize the base. 2483 bool InitList = true; 2484 Expr **Args = &Init; 2485 unsigned NumArgs = 1; 2486 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2487 InitList = false; 2488 Args = ParenList->getExprs(); 2489 NumArgs = ParenList->getNumExprs(); 2490 } 2491 2492 InitializedEntity BaseEntity = 2493 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2494 InitializationKind Kind = 2495 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2496 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2497 InitRange.getEnd()); 2498 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2499 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2500 MultiExprArg(Args, NumArgs), 0); 2501 if (BaseInit.isInvalid()) 2502 return true; 2503 2504 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2505 2506 // C++0x [class.base.init]p7: 2507 // The initialization of each base and member constitutes a 2508 // full-expression. 2509 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2510 if (BaseInit.isInvalid()) 2511 return true; 2512 2513 // If we are in a dependent context, template instantiation will 2514 // perform this type-checking again. Just save the arguments that we 2515 // received in a ParenListExpr. 2516 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2517 // of the information that we have about the base 2518 // initializer. However, deconstructing the ASTs is a dicey process, 2519 // and this approach is far more likely to get the corner cases right. 2520 if (CurContext->isDependentContext()) 2521 BaseInit = Owned(Init); 2522 2523 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2524 BaseSpec->isVirtual(), 2525 InitRange.getBegin(), 2526 BaseInit.takeAs<Expr>(), 2527 InitRange.getEnd(), EllipsisLoc); 2528} 2529 2530// Create a static_cast\<T&&>(expr). 2531static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2532 QualType ExprType = E->getType(); 2533 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2534 SourceLocation ExprLoc = E->getLocStart(); 2535 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2536 TargetType, ExprLoc); 2537 2538 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2539 SourceRange(ExprLoc, ExprLoc), 2540 E->getSourceRange()).take(); 2541} 2542 2543/// ImplicitInitializerKind - How an implicit base or member initializer should 2544/// initialize its base or member. 2545enum ImplicitInitializerKind { 2546 IIK_Default, 2547 IIK_Copy, 2548 IIK_Move 2549}; 2550 2551static bool 2552BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2553 ImplicitInitializerKind ImplicitInitKind, 2554 CXXBaseSpecifier *BaseSpec, 2555 bool IsInheritedVirtualBase, 2556 CXXCtorInitializer *&CXXBaseInit) { 2557 InitializedEntity InitEntity 2558 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2559 IsInheritedVirtualBase); 2560 2561 ExprResult BaseInit; 2562 2563 switch (ImplicitInitKind) { 2564 case IIK_Default: { 2565 InitializationKind InitKind 2566 = InitializationKind::CreateDefault(Constructor->getLocation()); 2567 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2568 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2569 break; 2570 } 2571 2572 case IIK_Move: 2573 case IIK_Copy: { 2574 bool Moving = ImplicitInitKind == IIK_Move; 2575 ParmVarDecl *Param = Constructor->getParamDecl(0); 2576 QualType ParamType = Param->getType().getNonReferenceType(); 2577 2578 Expr *CopyCtorArg = 2579 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2580 SourceLocation(), Param, false, 2581 Constructor->getLocation(), ParamType, 2582 VK_LValue, 0); 2583 2584 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2585 2586 // Cast to the base class to avoid ambiguities. 2587 QualType ArgTy = 2588 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2589 ParamType.getQualifiers()); 2590 2591 if (Moving) { 2592 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2593 } 2594 2595 CXXCastPath BasePath; 2596 BasePath.push_back(BaseSpec); 2597 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2598 CK_UncheckedDerivedToBase, 2599 Moving ? VK_XValue : VK_LValue, 2600 &BasePath).take(); 2601 2602 InitializationKind InitKind 2603 = InitializationKind::CreateDirect(Constructor->getLocation(), 2604 SourceLocation(), SourceLocation()); 2605 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2606 &CopyCtorArg, 1); 2607 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2608 MultiExprArg(&CopyCtorArg, 1)); 2609 break; 2610 } 2611 } 2612 2613 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2614 if (BaseInit.isInvalid()) 2615 return true; 2616 2617 CXXBaseInit = 2618 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2619 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2620 SourceLocation()), 2621 BaseSpec->isVirtual(), 2622 SourceLocation(), 2623 BaseInit.takeAs<Expr>(), 2624 SourceLocation(), 2625 SourceLocation()); 2626 2627 return false; 2628} 2629 2630static bool RefersToRValueRef(Expr *MemRef) { 2631 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2632 return Referenced->getType()->isRValueReferenceType(); 2633} 2634 2635static bool 2636BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2637 ImplicitInitializerKind ImplicitInitKind, 2638 FieldDecl *Field, IndirectFieldDecl *Indirect, 2639 CXXCtorInitializer *&CXXMemberInit) { 2640 if (Field->isInvalidDecl()) 2641 return true; 2642 2643 SourceLocation Loc = Constructor->getLocation(); 2644 2645 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2646 bool Moving = ImplicitInitKind == IIK_Move; 2647 ParmVarDecl *Param = Constructor->getParamDecl(0); 2648 QualType ParamType = Param->getType().getNonReferenceType(); 2649 2650 // Suppress copying zero-width bitfields. 2651 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2652 return false; 2653 2654 Expr *MemberExprBase = 2655 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2656 SourceLocation(), Param, false, 2657 Loc, ParamType, VK_LValue, 0); 2658 2659 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2660 2661 if (Moving) { 2662 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2663 } 2664 2665 // Build a reference to this field within the parameter. 2666 CXXScopeSpec SS; 2667 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2668 Sema::LookupMemberName); 2669 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2670 : cast<ValueDecl>(Field), AS_public); 2671 MemberLookup.resolveKind(); 2672 ExprResult CtorArg 2673 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2674 ParamType, Loc, 2675 /*IsArrow=*/false, 2676 SS, 2677 /*TemplateKWLoc=*/SourceLocation(), 2678 /*FirstQualifierInScope=*/0, 2679 MemberLookup, 2680 /*TemplateArgs=*/0); 2681 if (CtorArg.isInvalid()) 2682 return true; 2683 2684 // C++11 [class.copy]p15: 2685 // - if a member m has rvalue reference type T&&, it is direct-initialized 2686 // with static_cast<T&&>(x.m); 2687 if (RefersToRValueRef(CtorArg.get())) { 2688 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2689 } 2690 2691 // When the field we are copying is an array, create index variables for 2692 // each dimension of the array. We use these index variables to subscript 2693 // the source array, and other clients (e.g., CodeGen) will perform the 2694 // necessary iteration with these index variables. 2695 SmallVector<VarDecl *, 4> IndexVariables; 2696 QualType BaseType = Field->getType(); 2697 QualType SizeType = SemaRef.Context.getSizeType(); 2698 bool InitializingArray = false; 2699 while (const ConstantArrayType *Array 2700 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2701 InitializingArray = true; 2702 // Create the iteration variable for this array index. 2703 IdentifierInfo *IterationVarName = 0; 2704 { 2705 SmallString<8> Str; 2706 llvm::raw_svector_ostream OS(Str); 2707 OS << "__i" << IndexVariables.size(); 2708 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2709 } 2710 VarDecl *IterationVar 2711 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2712 IterationVarName, SizeType, 2713 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2714 SC_None, SC_None); 2715 IndexVariables.push_back(IterationVar); 2716 2717 // Create a reference to the iteration variable. 2718 ExprResult IterationVarRef 2719 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2720 assert(!IterationVarRef.isInvalid() && 2721 "Reference to invented variable cannot fail!"); 2722 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2723 assert(!IterationVarRef.isInvalid() && 2724 "Conversion of invented variable cannot fail!"); 2725 2726 // Subscript the array with this iteration variable. 2727 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2728 IterationVarRef.take(), 2729 Loc); 2730 if (CtorArg.isInvalid()) 2731 return true; 2732 2733 BaseType = Array->getElementType(); 2734 } 2735 2736 // The array subscript expression is an lvalue, which is wrong for moving. 2737 if (Moving && InitializingArray) 2738 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2739 2740 // Construct the entity that we will be initializing. For an array, this 2741 // will be first element in the array, which may require several levels 2742 // of array-subscript entities. 2743 SmallVector<InitializedEntity, 4> Entities; 2744 Entities.reserve(1 + IndexVariables.size()); 2745 if (Indirect) 2746 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2747 else 2748 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2749 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2750 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2751 0, 2752 Entities.back())); 2753 2754 // Direct-initialize to use the copy constructor. 2755 InitializationKind InitKind = 2756 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2757 2758 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2759 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2760 &CtorArgE, 1); 2761 2762 ExprResult MemberInit 2763 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2764 MultiExprArg(&CtorArgE, 1)); 2765 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2766 if (MemberInit.isInvalid()) 2767 return true; 2768 2769 if (Indirect) { 2770 assert(IndexVariables.size() == 0 && 2771 "Indirect field improperly initialized"); 2772 CXXMemberInit 2773 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2774 Loc, Loc, 2775 MemberInit.takeAs<Expr>(), 2776 Loc); 2777 } else 2778 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2779 Loc, MemberInit.takeAs<Expr>(), 2780 Loc, 2781 IndexVariables.data(), 2782 IndexVariables.size()); 2783 return false; 2784 } 2785 2786 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2787 2788 QualType FieldBaseElementType = 2789 SemaRef.Context.getBaseElementType(Field->getType()); 2790 2791 if (FieldBaseElementType->isRecordType()) { 2792 InitializedEntity InitEntity 2793 = Indirect? InitializedEntity::InitializeMember(Indirect) 2794 : InitializedEntity::InitializeMember(Field); 2795 InitializationKind InitKind = 2796 InitializationKind::CreateDefault(Loc); 2797 2798 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2799 ExprResult MemberInit = 2800 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2801 2802 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2803 if (MemberInit.isInvalid()) 2804 return true; 2805 2806 if (Indirect) 2807 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2808 Indirect, Loc, 2809 Loc, 2810 MemberInit.get(), 2811 Loc); 2812 else 2813 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2814 Field, Loc, Loc, 2815 MemberInit.get(), 2816 Loc); 2817 return false; 2818 } 2819 2820 if (!Field->getParent()->isUnion()) { 2821 if (FieldBaseElementType->isReferenceType()) { 2822 SemaRef.Diag(Constructor->getLocation(), 2823 diag::err_uninitialized_member_in_ctor) 2824 << (int)Constructor->isImplicit() 2825 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2826 << 0 << Field->getDeclName(); 2827 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2828 return true; 2829 } 2830 2831 if (FieldBaseElementType.isConstQualified()) { 2832 SemaRef.Diag(Constructor->getLocation(), 2833 diag::err_uninitialized_member_in_ctor) 2834 << (int)Constructor->isImplicit() 2835 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2836 << 1 << Field->getDeclName(); 2837 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2838 return true; 2839 } 2840 } 2841 2842 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2843 FieldBaseElementType->isObjCRetainableType() && 2844 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2845 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2846 // ARC: 2847 // Default-initialize Objective-C pointers to NULL. 2848 CXXMemberInit 2849 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2850 Loc, Loc, 2851 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2852 Loc); 2853 return false; 2854 } 2855 2856 // Nothing to initialize. 2857 CXXMemberInit = 0; 2858 return false; 2859} 2860 2861namespace { 2862struct BaseAndFieldInfo { 2863 Sema &S; 2864 CXXConstructorDecl *Ctor; 2865 bool AnyErrorsInInits; 2866 ImplicitInitializerKind IIK; 2867 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2868 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2869 2870 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2871 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2872 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2873 if (Generated && Ctor->isCopyConstructor()) 2874 IIK = IIK_Copy; 2875 else if (Generated && Ctor->isMoveConstructor()) 2876 IIK = IIK_Move; 2877 else 2878 IIK = IIK_Default; 2879 } 2880 2881 bool isImplicitCopyOrMove() const { 2882 switch (IIK) { 2883 case IIK_Copy: 2884 case IIK_Move: 2885 return true; 2886 2887 case IIK_Default: 2888 return false; 2889 } 2890 2891 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2892 } 2893 2894 bool addFieldInitializer(CXXCtorInitializer *Init) { 2895 AllToInit.push_back(Init); 2896 2897 // Check whether this initializer makes the field "used". 2898 if (Init->getInit() && Init->getInit()->HasSideEffects(S.Context)) 2899 S.UnusedPrivateFields.remove(Init->getAnyMember()); 2900 2901 return false; 2902 } 2903}; 2904} 2905 2906/// \brief Determine whether the given indirect field declaration is somewhere 2907/// within an anonymous union. 2908static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2909 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2910 CEnd = F->chain_end(); 2911 C != CEnd; ++C) 2912 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2913 if (Record->isUnion()) 2914 return true; 2915 2916 return false; 2917} 2918 2919/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2920/// array type. 2921static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2922 if (T->isIncompleteArrayType()) 2923 return true; 2924 2925 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2926 if (!ArrayT->getSize()) 2927 return true; 2928 2929 T = ArrayT->getElementType(); 2930 } 2931 2932 return false; 2933} 2934 2935static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2936 FieldDecl *Field, 2937 IndirectFieldDecl *Indirect = 0) { 2938 2939 // Overwhelmingly common case: we have a direct initializer for this field. 2940 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) 2941 return Info.addFieldInitializer(Init); 2942 2943 // C++11 [class.base.init]p8: if the entity is a non-static data member that 2944 // has a brace-or-equal-initializer, the entity is initialized as specified 2945 // in [dcl.init]. 2946 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2947 CXXCtorInitializer *Init; 2948 if (Indirect) 2949 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2950 SourceLocation(), 2951 SourceLocation(), 0, 2952 SourceLocation()); 2953 else 2954 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2955 SourceLocation(), 2956 SourceLocation(), 0, 2957 SourceLocation()); 2958 return Info.addFieldInitializer(Init); 2959 } 2960 2961 // Don't build an implicit initializer for union members if none was 2962 // explicitly specified. 2963 if (Field->getParent()->isUnion() || 2964 (Indirect && isWithinAnonymousUnion(Indirect))) 2965 return false; 2966 2967 // Don't initialize incomplete or zero-length arrays. 2968 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2969 return false; 2970 2971 // Don't try to build an implicit initializer if there were semantic 2972 // errors in any of the initializers (and therefore we might be 2973 // missing some that the user actually wrote). 2974 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2975 return false; 2976 2977 CXXCtorInitializer *Init = 0; 2978 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2979 Indirect, Init)) 2980 return true; 2981 2982 if (!Init) 2983 return false; 2984 2985 return Info.addFieldInitializer(Init); 2986} 2987 2988bool 2989Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2990 CXXCtorInitializer *Initializer) { 2991 assert(Initializer->isDelegatingInitializer()); 2992 Constructor->setNumCtorInitializers(1); 2993 CXXCtorInitializer **initializer = 2994 new (Context) CXXCtorInitializer*[1]; 2995 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2996 Constructor->setCtorInitializers(initializer); 2997 2998 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2999 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 3000 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 3001 } 3002 3003 DelegatingCtorDecls.push_back(Constructor); 3004 3005 return false; 3006} 3007 3008bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 3009 CXXCtorInitializer **Initializers, 3010 unsigned NumInitializers, 3011 bool AnyErrors) { 3012 if (Constructor->isDependentContext()) { 3013 // Just store the initializers as written, they will be checked during 3014 // instantiation. 3015 if (NumInitializers > 0) { 3016 Constructor->setNumCtorInitializers(NumInitializers); 3017 CXXCtorInitializer **baseOrMemberInitializers = 3018 new (Context) CXXCtorInitializer*[NumInitializers]; 3019 memcpy(baseOrMemberInitializers, Initializers, 3020 NumInitializers * sizeof(CXXCtorInitializer*)); 3021 Constructor->setCtorInitializers(baseOrMemberInitializers); 3022 } 3023 3024 // Let template instantiation know whether we had errors. 3025 if (AnyErrors) 3026 Constructor->setInvalidDecl(); 3027 3028 return false; 3029 } 3030 3031 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 3032 3033 // We need to build the initializer AST according to order of construction 3034 // and not what user specified in the Initializers list. 3035 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 3036 if (!ClassDecl) 3037 return true; 3038 3039 bool HadError = false; 3040 3041 for (unsigned i = 0; i < NumInitializers; i++) { 3042 CXXCtorInitializer *Member = Initializers[i]; 3043 3044 if (Member->isBaseInitializer()) 3045 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 3046 else 3047 Info.AllBaseFields[Member->getAnyMember()] = Member; 3048 } 3049 3050 // Keep track of the direct virtual bases. 3051 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 3052 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 3053 E = ClassDecl->bases_end(); I != E; ++I) { 3054 if (I->isVirtual()) 3055 DirectVBases.insert(I); 3056 } 3057 3058 // Push virtual bases before others. 3059 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3060 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3061 3062 if (CXXCtorInitializer *Value 3063 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 3064 Info.AllToInit.push_back(Value); 3065 } else if (!AnyErrors) { 3066 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 3067 CXXCtorInitializer *CXXBaseInit; 3068 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3069 VBase, IsInheritedVirtualBase, 3070 CXXBaseInit)) { 3071 HadError = true; 3072 continue; 3073 } 3074 3075 Info.AllToInit.push_back(CXXBaseInit); 3076 } 3077 } 3078 3079 // Non-virtual bases. 3080 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3081 E = ClassDecl->bases_end(); Base != E; ++Base) { 3082 // Virtuals are in the virtual base list and already constructed. 3083 if (Base->isVirtual()) 3084 continue; 3085 3086 if (CXXCtorInitializer *Value 3087 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3088 Info.AllToInit.push_back(Value); 3089 } else if (!AnyErrors) { 3090 CXXCtorInitializer *CXXBaseInit; 3091 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3092 Base, /*IsInheritedVirtualBase=*/false, 3093 CXXBaseInit)) { 3094 HadError = true; 3095 continue; 3096 } 3097 3098 Info.AllToInit.push_back(CXXBaseInit); 3099 } 3100 } 3101 3102 // Fields. 3103 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3104 MemEnd = ClassDecl->decls_end(); 3105 Mem != MemEnd; ++Mem) { 3106 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3107 // C++ [class.bit]p2: 3108 // A declaration for a bit-field that omits the identifier declares an 3109 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3110 // initialized. 3111 if (F->isUnnamedBitfield()) 3112 continue; 3113 3114 // If we're not generating the implicit copy/move constructor, then we'll 3115 // handle anonymous struct/union fields based on their individual 3116 // indirect fields. 3117 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 3118 continue; 3119 3120 if (CollectFieldInitializer(*this, Info, F)) 3121 HadError = true; 3122 continue; 3123 } 3124 3125 // Beyond this point, we only consider default initialization. 3126 if (Info.IIK != IIK_Default) 3127 continue; 3128 3129 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3130 if (F->getType()->isIncompleteArrayType()) { 3131 assert(ClassDecl->hasFlexibleArrayMember() && 3132 "Incomplete array type is not valid"); 3133 continue; 3134 } 3135 3136 // Initialize each field of an anonymous struct individually. 3137 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3138 HadError = true; 3139 3140 continue; 3141 } 3142 } 3143 3144 NumInitializers = Info.AllToInit.size(); 3145 if (NumInitializers > 0) { 3146 Constructor->setNumCtorInitializers(NumInitializers); 3147 CXXCtorInitializer **baseOrMemberInitializers = 3148 new (Context) CXXCtorInitializer*[NumInitializers]; 3149 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3150 NumInitializers * sizeof(CXXCtorInitializer*)); 3151 Constructor->setCtorInitializers(baseOrMemberInitializers); 3152 3153 // Constructors implicitly reference the base and member 3154 // destructors. 3155 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3156 Constructor->getParent()); 3157 } 3158 3159 return HadError; 3160} 3161 3162static void *GetKeyForTopLevelField(FieldDecl *Field) { 3163 // For anonymous unions, use the class declaration as the key. 3164 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3165 if (RT->getDecl()->isAnonymousStructOrUnion()) 3166 return static_cast<void *>(RT->getDecl()); 3167 } 3168 return static_cast<void *>(Field); 3169} 3170 3171static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3172 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3173} 3174 3175static void *GetKeyForMember(ASTContext &Context, 3176 CXXCtorInitializer *Member) { 3177 if (!Member->isAnyMemberInitializer()) 3178 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3179 3180 // For fields injected into the class via declaration of an anonymous union, 3181 // use its anonymous union class declaration as the unique key. 3182 FieldDecl *Field = Member->getAnyMember(); 3183 3184 // If the field is a member of an anonymous struct or union, our key 3185 // is the anonymous record decl that's a direct child of the class. 3186 RecordDecl *RD = Field->getParent(); 3187 if (RD->isAnonymousStructOrUnion()) { 3188 while (true) { 3189 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3190 if (Parent->isAnonymousStructOrUnion()) 3191 RD = Parent; 3192 else 3193 break; 3194 } 3195 3196 return static_cast<void *>(RD); 3197 } 3198 3199 return static_cast<void *>(Field); 3200} 3201 3202static void 3203DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3204 const CXXConstructorDecl *Constructor, 3205 CXXCtorInitializer **Inits, 3206 unsigned NumInits) { 3207 if (Constructor->getDeclContext()->isDependentContext()) 3208 return; 3209 3210 // Don't check initializers order unless the warning is enabled at the 3211 // location of at least one initializer. 3212 bool ShouldCheckOrder = false; 3213 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3214 CXXCtorInitializer *Init = Inits[InitIndex]; 3215 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3216 Init->getSourceLocation()) 3217 != DiagnosticsEngine::Ignored) { 3218 ShouldCheckOrder = true; 3219 break; 3220 } 3221 } 3222 if (!ShouldCheckOrder) 3223 return; 3224 3225 // Build the list of bases and members in the order that they'll 3226 // actually be initialized. The explicit initializers should be in 3227 // this same order but may be missing things. 3228 SmallVector<const void*, 32> IdealInitKeys; 3229 3230 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3231 3232 // 1. Virtual bases. 3233 for (CXXRecordDecl::base_class_const_iterator VBase = 3234 ClassDecl->vbases_begin(), 3235 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3236 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3237 3238 // 2. Non-virtual bases. 3239 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3240 E = ClassDecl->bases_end(); Base != E; ++Base) { 3241 if (Base->isVirtual()) 3242 continue; 3243 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3244 } 3245 3246 // 3. Direct fields. 3247 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3248 E = ClassDecl->field_end(); Field != E; ++Field) { 3249 if (Field->isUnnamedBitfield()) 3250 continue; 3251 3252 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3253 } 3254 3255 unsigned NumIdealInits = IdealInitKeys.size(); 3256 unsigned IdealIndex = 0; 3257 3258 CXXCtorInitializer *PrevInit = 0; 3259 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3260 CXXCtorInitializer *Init = Inits[InitIndex]; 3261 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3262 3263 // Scan forward to try to find this initializer in the idealized 3264 // initializers list. 3265 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3266 if (InitKey == IdealInitKeys[IdealIndex]) 3267 break; 3268 3269 // If we didn't find this initializer, it must be because we 3270 // scanned past it on a previous iteration. That can only 3271 // happen if we're out of order; emit a warning. 3272 if (IdealIndex == NumIdealInits && PrevInit) { 3273 Sema::SemaDiagnosticBuilder D = 3274 SemaRef.Diag(PrevInit->getSourceLocation(), 3275 diag::warn_initializer_out_of_order); 3276 3277 if (PrevInit->isAnyMemberInitializer()) 3278 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3279 else 3280 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3281 3282 if (Init->isAnyMemberInitializer()) 3283 D << 0 << Init->getAnyMember()->getDeclName(); 3284 else 3285 D << 1 << Init->getTypeSourceInfo()->getType(); 3286 3287 // Move back to the initializer's location in the ideal list. 3288 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3289 if (InitKey == IdealInitKeys[IdealIndex]) 3290 break; 3291 3292 assert(IdealIndex != NumIdealInits && 3293 "initializer not found in initializer list"); 3294 } 3295 3296 PrevInit = Init; 3297 } 3298} 3299 3300namespace { 3301bool CheckRedundantInit(Sema &S, 3302 CXXCtorInitializer *Init, 3303 CXXCtorInitializer *&PrevInit) { 3304 if (!PrevInit) { 3305 PrevInit = Init; 3306 return false; 3307 } 3308 3309 if (FieldDecl *Field = Init->getMember()) 3310 S.Diag(Init->getSourceLocation(), 3311 diag::err_multiple_mem_initialization) 3312 << Field->getDeclName() 3313 << Init->getSourceRange(); 3314 else { 3315 const Type *BaseClass = Init->getBaseClass(); 3316 assert(BaseClass && "neither field nor base"); 3317 S.Diag(Init->getSourceLocation(), 3318 diag::err_multiple_base_initialization) 3319 << QualType(BaseClass, 0) 3320 << Init->getSourceRange(); 3321 } 3322 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3323 << 0 << PrevInit->getSourceRange(); 3324 3325 return true; 3326} 3327 3328typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3329typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3330 3331bool CheckRedundantUnionInit(Sema &S, 3332 CXXCtorInitializer *Init, 3333 RedundantUnionMap &Unions) { 3334 FieldDecl *Field = Init->getAnyMember(); 3335 RecordDecl *Parent = Field->getParent(); 3336 NamedDecl *Child = Field; 3337 3338 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3339 if (Parent->isUnion()) { 3340 UnionEntry &En = Unions[Parent]; 3341 if (En.first && En.first != Child) { 3342 S.Diag(Init->getSourceLocation(), 3343 diag::err_multiple_mem_union_initialization) 3344 << Field->getDeclName() 3345 << Init->getSourceRange(); 3346 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3347 << 0 << En.second->getSourceRange(); 3348 return true; 3349 } 3350 if (!En.first) { 3351 En.first = Child; 3352 En.second = Init; 3353 } 3354 if (!Parent->isAnonymousStructOrUnion()) 3355 return false; 3356 } 3357 3358 Child = Parent; 3359 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3360 } 3361 3362 return false; 3363} 3364} 3365 3366/// ActOnMemInitializers - Handle the member initializers for a constructor. 3367void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3368 SourceLocation ColonLoc, 3369 CXXCtorInitializer **meminits, 3370 unsigned NumMemInits, 3371 bool AnyErrors) { 3372 if (!ConstructorDecl) 3373 return; 3374 3375 AdjustDeclIfTemplate(ConstructorDecl); 3376 3377 CXXConstructorDecl *Constructor 3378 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3379 3380 if (!Constructor) { 3381 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3382 return; 3383 } 3384 3385 CXXCtorInitializer **MemInits = 3386 reinterpret_cast<CXXCtorInitializer **>(meminits); 3387 3388 // Mapping for the duplicate initializers check. 3389 // For member initializers, this is keyed with a FieldDecl*. 3390 // For base initializers, this is keyed with a Type*. 3391 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3392 3393 // Mapping for the inconsistent anonymous-union initializers check. 3394 RedundantUnionMap MemberUnions; 3395 3396 bool HadError = false; 3397 for (unsigned i = 0; i < NumMemInits; i++) { 3398 CXXCtorInitializer *Init = MemInits[i]; 3399 3400 // Set the source order index. 3401 Init->setSourceOrder(i); 3402 3403 if (Init->isAnyMemberInitializer()) { 3404 FieldDecl *Field = Init->getAnyMember(); 3405 if (CheckRedundantInit(*this, Init, Members[Field]) || 3406 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3407 HadError = true; 3408 } else if (Init->isBaseInitializer()) { 3409 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3410 if (CheckRedundantInit(*this, Init, Members[Key])) 3411 HadError = true; 3412 } else { 3413 assert(Init->isDelegatingInitializer()); 3414 // This must be the only initializer 3415 if (NumMemInits != 1) { 3416 Diag(Init->getSourceLocation(), 3417 diag::err_delegating_initializer_alone) 3418 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange(); 3419 // We will treat this as being the only initializer. 3420 } 3421 SetDelegatingInitializer(Constructor, MemInits[i]); 3422 // Return immediately as the initializer is set. 3423 return; 3424 } 3425 } 3426 3427 if (HadError) 3428 return; 3429 3430 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3431 3432 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3433} 3434 3435void 3436Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3437 CXXRecordDecl *ClassDecl) { 3438 // Ignore dependent contexts. Also ignore unions, since their members never 3439 // have destructors implicitly called. 3440 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3441 return; 3442 3443 // FIXME: all the access-control diagnostics are positioned on the 3444 // field/base declaration. That's probably good; that said, the 3445 // user might reasonably want to know why the destructor is being 3446 // emitted, and we currently don't say. 3447 3448 // Non-static data members. 3449 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3450 E = ClassDecl->field_end(); I != E; ++I) { 3451 FieldDecl *Field = *I; 3452 if (Field->isInvalidDecl()) 3453 continue; 3454 3455 // Don't destroy incomplete or zero-length arrays. 3456 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3457 continue; 3458 3459 QualType FieldType = Context.getBaseElementType(Field->getType()); 3460 3461 const RecordType* RT = FieldType->getAs<RecordType>(); 3462 if (!RT) 3463 continue; 3464 3465 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3466 if (FieldClassDecl->isInvalidDecl()) 3467 continue; 3468 if (FieldClassDecl->hasIrrelevantDestructor()) 3469 continue; 3470 // The destructor for an implicit anonymous union member is never invoked. 3471 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3472 continue; 3473 3474 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3475 assert(Dtor && "No dtor found for FieldClassDecl!"); 3476 CheckDestructorAccess(Field->getLocation(), Dtor, 3477 PDiag(diag::err_access_dtor_field) 3478 << Field->getDeclName() 3479 << FieldType); 3480 3481 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3482 DiagnoseUseOfDecl(Dtor, Location); 3483 } 3484 3485 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3486 3487 // Bases. 3488 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3489 E = ClassDecl->bases_end(); Base != E; ++Base) { 3490 // Bases are always records in a well-formed non-dependent class. 3491 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3492 3493 // Remember direct virtual bases. 3494 if (Base->isVirtual()) 3495 DirectVirtualBases.insert(RT); 3496 3497 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3498 // If our base class is invalid, we probably can't get its dtor anyway. 3499 if (BaseClassDecl->isInvalidDecl()) 3500 continue; 3501 if (BaseClassDecl->hasIrrelevantDestructor()) 3502 continue; 3503 3504 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3505 assert(Dtor && "No dtor found for BaseClassDecl!"); 3506 3507 // FIXME: caret should be on the start of the class name 3508 CheckDestructorAccess(Base->getLocStart(), Dtor, 3509 PDiag(diag::err_access_dtor_base) 3510 << Base->getType() 3511 << Base->getSourceRange(), 3512 Context.getTypeDeclType(ClassDecl)); 3513 3514 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3515 DiagnoseUseOfDecl(Dtor, Location); 3516 } 3517 3518 // Virtual bases. 3519 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3520 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3521 3522 // Bases are always records in a well-formed non-dependent class. 3523 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3524 3525 // Ignore direct virtual bases. 3526 if (DirectVirtualBases.count(RT)) 3527 continue; 3528 3529 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3530 // If our base class is invalid, we probably can't get its dtor anyway. 3531 if (BaseClassDecl->isInvalidDecl()) 3532 continue; 3533 if (BaseClassDecl->hasIrrelevantDestructor()) 3534 continue; 3535 3536 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3537 assert(Dtor && "No dtor found for BaseClassDecl!"); 3538 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3539 PDiag(diag::err_access_dtor_vbase) 3540 << VBase->getType(), 3541 Context.getTypeDeclType(ClassDecl)); 3542 3543 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3544 DiagnoseUseOfDecl(Dtor, Location); 3545 } 3546} 3547 3548void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3549 if (!CDtorDecl) 3550 return; 3551 3552 if (CXXConstructorDecl *Constructor 3553 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3554 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3555} 3556 3557bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3558 unsigned DiagID, AbstractDiagSelID SelID) { 3559 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3560 unsigned DiagID; 3561 AbstractDiagSelID SelID; 3562 3563 public: 3564 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3565 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3566 3567 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 3568 if (Suppressed) return; 3569 if (SelID == -1) 3570 S.Diag(Loc, DiagID) << T; 3571 else 3572 S.Diag(Loc, DiagID) << SelID << T; 3573 } 3574 } Diagnoser(DiagID, SelID); 3575 3576 return RequireNonAbstractType(Loc, T, Diagnoser); 3577} 3578 3579bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3580 TypeDiagnoser &Diagnoser) { 3581 if (!getLangOpts().CPlusPlus) 3582 return false; 3583 3584 if (const ArrayType *AT = Context.getAsArrayType(T)) 3585 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3586 3587 if (const PointerType *PT = T->getAs<PointerType>()) { 3588 // Find the innermost pointer type. 3589 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3590 PT = T; 3591 3592 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3593 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3594 } 3595 3596 const RecordType *RT = T->getAs<RecordType>(); 3597 if (!RT) 3598 return false; 3599 3600 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3601 3602 // We can't answer whether something is abstract until it has a 3603 // definition. If it's currently being defined, we'll walk back 3604 // over all the declarations when we have a full definition. 3605 const CXXRecordDecl *Def = RD->getDefinition(); 3606 if (!Def || Def->isBeingDefined()) 3607 return false; 3608 3609 if (!RD->isAbstract()) 3610 return false; 3611 3612 Diagnoser.diagnose(*this, Loc, T); 3613 DiagnoseAbstractType(RD); 3614 3615 return true; 3616} 3617 3618void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3619 // Check if we've already emitted the list of pure virtual functions 3620 // for this class. 3621 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3622 return; 3623 3624 CXXFinalOverriderMap FinalOverriders; 3625 RD->getFinalOverriders(FinalOverriders); 3626 3627 // Keep a set of seen pure methods so we won't diagnose the same method 3628 // more than once. 3629 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3630 3631 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3632 MEnd = FinalOverriders.end(); 3633 M != MEnd; 3634 ++M) { 3635 for (OverridingMethods::iterator SO = M->second.begin(), 3636 SOEnd = M->second.end(); 3637 SO != SOEnd; ++SO) { 3638 // C++ [class.abstract]p4: 3639 // A class is abstract if it contains or inherits at least one 3640 // pure virtual function for which the final overrider is pure 3641 // virtual. 3642 3643 // 3644 if (SO->second.size() != 1) 3645 continue; 3646 3647 if (!SO->second.front().Method->isPure()) 3648 continue; 3649 3650 if (!SeenPureMethods.insert(SO->second.front().Method)) 3651 continue; 3652 3653 Diag(SO->second.front().Method->getLocation(), 3654 diag::note_pure_virtual_function) 3655 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3656 } 3657 } 3658 3659 if (!PureVirtualClassDiagSet) 3660 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3661 PureVirtualClassDiagSet->insert(RD); 3662} 3663 3664namespace { 3665struct AbstractUsageInfo { 3666 Sema &S; 3667 CXXRecordDecl *Record; 3668 CanQualType AbstractType; 3669 bool Invalid; 3670 3671 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3672 : S(S), Record(Record), 3673 AbstractType(S.Context.getCanonicalType( 3674 S.Context.getTypeDeclType(Record))), 3675 Invalid(false) {} 3676 3677 void DiagnoseAbstractType() { 3678 if (Invalid) return; 3679 S.DiagnoseAbstractType(Record); 3680 Invalid = true; 3681 } 3682 3683 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3684}; 3685 3686struct CheckAbstractUsage { 3687 AbstractUsageInfo &Info; 3688 const NamedDecl *Ctx; 3689 3690 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3691 : Info(Info), Ctx(Ctx) {} 3692 3693 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3694 switch (TL.getTypeLocClass()) { 3695#define ABSTRACT_TYPELOC(CLASS, PARENT) 3696#define TYPELOC(CLASS, PARENT) \ 3697 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3698#include "clang/AST/TypeLocNodes.def" 3699 } 3700 } 3701 3702 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3703 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3704 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3705 if (!TL.getArg(I)) 3706 continue; 3707 3708 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3709 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3710 } 3711 } 3712 3713 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3714 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3715 } 3716 3717 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3718 // Visit the type parameters from a permissive context. 3719 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3720 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3721 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3722 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3723 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3724 // TODO: other template argument types? 3725 } 3726 } 3727 3728 // Visit pointee types from a permissive context. 3729#define CheckPolymorphic(Type) \ 3730 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3731 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3732 } 3733 CheckPolymorphic(PointerTypeLoc) 3734 CheckPolymorphic(ReferenceTypeLoc) 3735 CheckPolymorphic(MemberPointerTypeLoc) 3736 CheckPolymorphic(BlockPointerTypeLoc) 3737 CheckPolymorphic(AtomicTypeLoc) 3738 3739 /// Handle all the types we haven't given a more specific 3740 /// implementation for above. 3741 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3742 // Every other kind of type that we haven't called out already 3743 // that has an inner type is either (1) sugar or (2) contains that 3744 // inner type in some way as a subobject. 3745 if (TypeLoc Next = TL.getNextTypeLoc()) 3746 return Visit(Next, Sel); 3747 3748 // If there's no inner type and we're in a permissive context, 3749 // don't diagnose. 3750 if (Sel == Sema::AbstractNone) return; 3751 3752 // Check whether the type matches the abstract type. 3753 QualType T = TL.getType(); 3754 if (T->isArrayType()) { 3755 Sel = Sema::AbstractArrayType; 3756 T = Info.S.Context.getBaseElementType(T); 3757 } 3758 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3759 if (CT != Info.AbstractType) return; 3760 3761 // It matched; do some magic. 3762 if (Sel == Sema::AbstractArrayType) { 3763 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3764 << T << TL.getSourceRange(); 3765 } else { 3766 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3767 << Sel << T << TL.getSourceRange(); 3768 } 3769 Info.DiagnoseAbstractType(); 3770 } 3771}; 3772 3773void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3774 Sema::AbstractDiagSelID Sel) { 3775 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3776} 3777 3778} 3779 3780/// Check for invalid uses of an abstract type in a method declaration. 3781static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3782 CXXMethodDecl *MD) { 3783 // No need to do the check on definitions, which require that 3784 // the return/param types be complete. 3785 if (MD->doesThisDeclarationHaveABody()) 3786 return; 3787 3788 // For safety's sake, just ignore it if we don't have type source 3789 // information. This should never happen for non-implicit methods, 3790 // but... 3791 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3792 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3793} 3794 3795/// Check for invalid uses of an abstract type within a class definition. 3796static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3797 CXXRecordDecl *RD) { 3798 for (CXXRecordDecl::decl_iterator 3799 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3800 Decl *D = *I; 3801 if (D->isImplicit()) continue; 3802 3803 // Methods and method templates. 3804 if (isa<CXXMethodDecl>(D)) { 3805 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3806 } else if (isa<FunctionTemplateDecl>(D)) { 3807 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3808 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3809 3810 // Fields and static variables. 3811 } else if (isa<FieldDecl>(D)) { 3812 FieldDecl *FD = cast<FieldDecl>(D); 3813 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3814 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3815 } else if (isa<VarDecl>(D)) { 3816 VarDecl *VD = cast<VarDecl>(D); 3817 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3818 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3819 3820 // Nested classes and class templates. 3821 } else if (isa<CXXRecordDecl>(D)) { 3822 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3823 } else if (isa<ClassTemplateDecl>(D)) { 3824 CheckAbstractClassUsage(Info, 3825 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3826 } 3827 } 3828} 3829 3830/// \brief Perform semantic checks on a class definition that has been 3831/// completing, introducing implicitly-declared members, checking for 3832/// abstract types, etc. 3833void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3834 if (!Record) 3835 return; 3836 3837 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3838 AbstractUsageInfo Info(*this, Record); 3839 CheckAbstractClassUsage(Info, Record); 3840 } 3841 3842 // If this is not an aggregate type and has no user-declared constructor, 3843 // complain about any non-static data members of reference or const scalar 3844 // type, since they will never get initializers. 3845 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3846 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3847 !Record->isLambda()) { 3848 bool Complained = false; 3849 for (RecordDecl::field_iterator F = Record->field_begin(), 3850 FEnd = Record->field_end(); 3851 F != FEnd; ++F) { 3852 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3853 continue; 3854 3855 if (F->getType()->isReferenceType() || 3856 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3857 if (!Complained) { 3858 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3859 << Record->getTagKind() << Record; 3860 Complained = true; 3861 } 3862 3863 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3864 << F->getType()->isReferenceType() 3865 << F->getDeclName(); 3866 } 3867 } 3868 } 3869 3870 if (Record->isDynamicClass() && !Record->isDependentType()) 3871 DynamicClasses.push_back(Record); 3872 3873 if (Record->getIdentifier()) { 3874 // C++ [class.mem]p13: 3875 // If T is the name of a class, then each of the following shall have a 3876 // name different from T: 3877 // - every member of every anonymous union that is a member of class T. 3878 // 3879 // C++ [class.mem]p14: 3880 // In addition, if class T has a user-declared constructor (12.1), every 3881 // non-static data member of class T shall have a name different from T. 3882 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3883 R.first != R.second; ++R.first) { 3884 NamedDecl *D = *R.first; 3885 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3886 isa<IndirectFieldDecl>(D)) { 3887 Diag(D->getLocation(), diag::err_member_name_of_class) 3888 << D->getDeclName(); 3889 break; 3890 } 3891 } 3892 } 3893 3894 // Warn if the class has virtual methods but non-virtual public destructor. 3895 if (Record->isPolymorphic() && !Record->isDependentType()) { 3896 CXXDestructorDecl *dtor = Record->getDestructor(); 3897 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3898 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3899 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3900 } 3901 3902 if (Record->isAbstract() && Record->hasAttr<FinalAttr>()) { 3903 Diag(Record->getLocation(), diag::warn_abstract_final_class); 3904 DiagnoseAbstractType(Record); 3905 } 3906 3907 // See if a method overloads virtual methods in a base 3908 /// class without overriding any. 3909 if (!Record->isDependentType()) { 3910 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3911 MEnd = Record->method_end(); 3912 M != MEnd; ++M) { 3913 if (!M->isStatic()) 3914 DiagnoseHiddenVirtualMethods(Record, *M); 3915 } 3916 } 3917 3918 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3919 // function that is not a constructor declares that member function to be 3920 // const. [...] The class of which that function is a member shall be 3921 // a literal type. 3922 // 3923 // If the class has virtual bases, any constexpr members will already have 3924 // been diagnosed by the checks performed on the member declaration, so 3925 // suppress this (less useful) diagnostic. 3926 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3927 !Record->isLiteral() && !Record->getNumVBases()) { 3928 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3929 MEnd = Record->method_end(); 3930 M != MEnd; ++M) { 3931 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3932 switch (Record->getTemplateSpecializationKind()) { 3933 case TSK_ImplicitInstantiation: 3934 case TSK_ExplicitInstantiationDeclaration: 3935 case TSK_ExplicitInstantiationDefinition: 3936 // If a template instantiates to a non-literal type, but its members 3937 // instantiate to constexpr functions, the template is technically 3938 // ill-formed, but we allow it for sanity. 3939 continue; 3940 3941 case TSK_Undeclared: 3942 case TSK_ExplicitSpecialization: 3943 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 3944 diag::err_constexpr_method_non_literal); 3945 break; 3946 } 3947 3948 // Only produce one error per class. 3949 break; 3950 } 3951 } 3952 } 3953 3954 // Declare inherited constructors. We do this eagerly here because: 3955 // - The standard requires an eager diagnostic for conflicting inherited 3956 // constructors from different classes. 3957 // - The lazy declaration of the other implicit constructors is so as to not 3958 // waste space and performance on classes that are not meant to be 3959 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3960 // have inherited constructors. 3961 DeclareInheritedConstructors(Record); 3962} 3963 3964void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3965 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3966 ME = Record->method_end(); 3967 MI != ME; ++MI) 3968 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) 3969 CheckExplicitlyDefaultedSpecialMember(*MI); 3970} 3971 3972/// Is the special member function which would be selected to perform the 3973/// specified operation on the specified class type a constexpr constructor? 3974static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3975 Sema::CXXSpecialMember CSM, 3976 bool ConstArg) { 3977 Sema::SpecialMemberOverloadResult *SMOR = 3978 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 3979 false, false, false, false); 3980 if (!SMOR || !SMOR->getMethod()) 3981 // A constructor we wouldn't select can't be "involved in initializing" 3982 // anything. 3983 return true; 3984 return SMOR->getMethod()->isConstexpr(); 3985} 3986 3987/// Determine whether the specified special member function would be constexpr 3988/// if it were implicitly defined. 3989static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3990 Sema::CXXSpecialMember CSM, 3991 bool ConstArg) { 3992 if (!S.getLangOpts().CPlusPlus0x) 3993 return false; 3994 3995 // C++11 [dcl.constexpr]p4: 3996 // In the definition of a constexpr constructor [...] 3997 switch (CSM) { 3998 case Sema::CXXDefaultConstructor: 3999 // Since default constructor lookup is essentially trivial (and cannot 4000 // involve, for instance, template instantiation), we compute whether a 4001 // defaulted default constructor is constexpr directly within CXXRecordDecl. 4002 // 4003 // This is important for performance; we need to know whether the default 4004 // constructor is constexpr to determine whether the type is a literal type. 4005 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 4006 4007 case Sema::CXXCopyConstructor: 4008 case Sema::CXXMoveConstructor: 4009 // For copy or move constructors, we need to perform overload resolution. 4010 break; 4011 4012 case Sema::CXXCopyAssignment: 4013 case Sema::CXXMoveAssignment: 4014 case Sema::CXXDestructor: 4015 case Sema::CXXInvalid: 4016 return false; 4017 } 4018 4019 // -- if the class is a non-empty union, or for each non-empty anonymous 4020 // union member of a non-union class, exactly one non-static data member 4021 // shall be initialized; [DR1359] 4022 // 4023 // If we squint, this is guaranteed, since exactly one non-static data member 4024 // will be initialized (if the constructor isn't deleted), we just don't know 4025 // which one. 4026 if (ClassDecl->isUnion()) 4027 return true; 4028 4029 // -- the class shall not have any virtual base classes; 4030 if (ClassDecl->getNumVBases()) 4031 return false; 4032 4033 // -- every constructor involved in initializing [...] base class 4034 // sub-objects shall be a constexpr constructor; 4035 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4036 BEnd = ClassDecl->bases_end(); 4037 B != BEnd; ++B) { 4038 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 4039 if (!BaseType) continue; 4040 4041 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4042 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 4043 return false; 4044 } 4045 4046 // -- every constructor involved in initializing non-static data members 4047 // [...] shall be a constexpr constructor; 4048 // -- every non-static data member and base class sub-object shall be 4049 // initialized 4050 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4051 FEnd = ClassDecl->field_end(); 4052 F != FEnd; ++F) { 4053 if (F->isInvalidDecl()) 4054 continue; 4055 if (const RecordType *RecordTy = 4056 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4057 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4058 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 4059 return false; 4060 } 4061 } 4062 4063 // All OK, it's constexpr! 4064 return true; 4065} 4066 4067static Sema::ImplicitExceptionSpecification 4068computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 4069 switch (S.getSpecialMember(MD)) { 4070 case Sema::CXXDefaultConstructor: 4071 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 4072 case Sema::CXXCopyConstructor: 4073 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 4074 case Sema::CXXCopyAssignment: 4075 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 4076 case Sema::CXXMoveConstructor: 4077 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 4078 case Sema::CXXMoveAssignment: 4079 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 4080 case Sema::CXXDestructor: 4081 return S.ComputeDefaultedDtorExceptionSpec(MD); 4082 case Sema::CXXInvalid: 4083 break; 4084 } 4085 llvm_unreachable("only special members have implicit exception specs"); 4086} 4087 4088static void 4089updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4090 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4091 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4092 ExceptSpec.getEPI(EPI); 4093 const FunctionProtoType *NewFPT = cast<FunctionProtoType>( 4094 S.Context.getFunctionType(FPT->getResultType(), FPT->arg_type_begin(), 4095 FPT->getNumArgs(), EPI)); 4096 FD->setType(QualType(NewFPT, 0)); 4097} 4098 4099void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4100 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4101 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4102 return; 4103 4104 // Evaluate the exception specification. 4105 ImplicitExceptionSpecification ExceptSpec = 4106 computeImplicitExceptionSpec(*this, Loc, MD); 4107 4108 // Update the type of the special member to use it. 4109 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4110 4111 // A user-provided destructor can be defined outside the class. When that 4112 // happens, be sure to update the exception specification on both 4113 // declarations. 4114 const FunctionProtoType *CanonicalFPT = 4115 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4116 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4117 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4118 CanonicalFPT, ExceptSpec); 4119} 4120 4121static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl); 4122static bool isImplicitCopyAssignmentArgConst(Sema &S, CXXRecordDecl *ClassDecl); 4123 4124void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4125 CXXRecordDecl *RD = MD->getParent(); 4126 CXXSpecialMember CSM = getSpecialMember(MD); 4127 4128 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4129 "not an explicitly-defaulted special member"); 4130 4131 // Whether this was the first-declared instance of the constructor. 4132 // This affects whether we implicitly add an exception spec and constexpr. 4133 bool First = MD == MD->getCanonicalDecl(); 4134 4135 bool HadError = false; 4136 4137 // C++11 [dcl.fct.def.default]p1: 4138 // A function that is explicitly defaulted shall 4139 // -- be a special member function (checked elsewhere), 4140 // -- have the same type (except for ref-qualifiers, and except that a 4141 // copy operation can take a non-const reference) as an implicit 4142 // declaration, and 4143 // -- not have default arguments. 4144 unsigned ExpectedParams = 1; 4145 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4146 ExpectedParams = 0; 4147 if (MD->getNumParams() != ExpectedParams) { 4148 // This also checks for default arguments: a copy or move constructor with a 4149 // default argument is classified as a default constructor, and assignment 4150 // operations and destructors can't have default arguments. 4151 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4152 << CSM << MD->getSourceRange(); 4153 HadError = true; 4154 } 4155 4156 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4157 4158 // Compute argument constness, constexpr, and triviality. 4159 bool CanHaveConstParam = false; 4160 bool Trivial = false; 4161 switch (CSM) { 4162 case CXXDefaultConstructor: 4163 Trivial = RD->hasTrivialDefaultConstructor(); 4164 break; 4165 case CXXCopyConstructor: 4166 CanHaveConstParam = isImplicitCopyCtorArgConst(*this, RD); 4167 Trivial = RD->hasTrivialCopyConstructor(); 4168 break; 4169 case CXXCopyAssignment: 4170 CanHaveConstParam = isImplicitCopyAssignmentArgConst(*this, RD); 4171 Trivial = RD->hasTrivialCopyAssignment(); 4172 break; 4173 case CXXMoveConstructor: 4174 Trivial = RD->hasTrivialMoveConstructor(); 4175 break; 4176 case CXXMoveAssignment: 4177 Trivial = RD->hasTrivialMoveAssignment(); 4178 break; 4179 case CXXDestructor: 4180 Trivial = RD->hasTrivialDestructor(); 4181 break; 4182 case CXXInvalid: 4183 llvm_unreachable("non-special member explicitly defaulted!"); 4184 } 4185 4186 QualType ReturnType = Context.VoidTy; 4187 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4188 // Check for return type matching. 4189 ReturnType = Type->getResultType(); 4190 QualType ExpectedReturnType = 4191 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4192 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4193 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4194 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4195 HadError = true; 4196 } 4197 4198 // A defaulted special member cannot have cv-qualifiers. 4199 if (Type->getTypeQuals()) { 4200 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4201 << (CSM == CXXMoveAssignment); 4202 HadError = true; 4203 } 4204 } 4205 4206 // Check for parameter type matching. 4207 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4208 bool HasConstParam = false; 4209 if (ExpectedParams && ArgType->isReferenceType()) { 4210 // Argument must be reference to possibly-const T. 4211 QualType ReferentType = ArgType->getPointeeType(); 4212 HasConstParam = ReferentType.isConstQualified(); 4213 4214 if (ReferentType.isVolatileQualified()) { 4215 Diag(MD->getLocation(), 4216 diag::err_defaulted_special_member_volatile_param) << CSM; 4217 HadError = true; 4218 } 4219 4220 if (HasConstParam && !CanHaveConstParam) { 4221 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4222 Diag(MD->getLocation(), 4223 diag::err_defaulted_special_member_copy_const_param) 4224 << (CSM == CXXCopyAssignment); 4225 // FIXME: Explain why this special member can't be const. 4226 } else { 4227 Diag(MD->getLocation(), 4228 diag::err_defaulted_special_member_move_const_param) 4229 << (CSM == CXXMoveAssignment); 4230 } 4231 HadError = true; 4232 } 4233 4234 // If a function is explicitly defaulted on its first declaration, it shall 4235 // have the same parameter type as if it had been implicitly declared. 4236 // (Presumably this is to prevent it from being trivial?) 4237 if (!HasConstParam && CanHaveConstParam && First) 4238 Diag(MD->getLocation(), 4239 diag::err_defaulted_special_member_copy_non_const_param) 4240 << (CSM == CXXCopyAssignment); 4241 } else if (ExpectedParams) { 4242 // A copy assignment operator can take its argument by value, but a 4243 // defaulted one cannot. 4244 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4245 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4246 HadError = true; 4247 } 4248 4249 // Rebuild the type with the implicit exception specification added, if we 4250 // are going to need it. 4251 const FunctionProtoType *ImplicitType = 0; 4252 if (First || Type->hasExceptionSpec()) { 4253 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4254 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4255 ImplicitType = cast<FunctionProtoType>( 4256 Context.getFunctionType(ReturnType, &ArgType, ExpectedParams, EPI)); 4257 } 4258 4259 // C++11 [dcl.fct.def.default]p2: 4260 // An explicitly-defaulted function may be declared constexpr only if it 4261 // would have been implicitly declared as constexpr, 4262 // Do not apply this rule to members of class templates, since core issue 1358 4263 // makes such functions always instantiate to constexpr functions. For 4264 // non-constructors, this is checked elsewhere. 4265 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4266 HasConstParam); 4267 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr && 4268 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4269 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4270 // FIXME: Explain why the constructor can't be constexpr. 4271 HadError = true; 4272 } 4273 // and may have an explicit exception-specification only if it is compatible 4274 // with the exception-specification on the implicit declaration. 4275 if (Type->hasExceptionSpec() && 4276 CheckEquivalentExceptionSpec( 4277 PDiag(diag::err_incorrect_defaulted_exception_spec) << CSM, 4278 PDiag(), ImplicitType, SourceLocation(), Type, MD->getLocation())) 4279 HadError = true; 4280 4281 // If a function is explicitly defaulted on its first declaration, 4282 if (First) { 4283 // -- it is implicitly considered to be constexpr if the implicit 4284 // definition would be, 4285 MD->setConstexpr(Constexpr); 4286 4287 // -- it is implicitly considered to have the same exception-specification 4288 // as if it had been implicitly declared, 4289 MD->setType(QualType(ImplicitType, 0)); 4290 4291 // Such a function is also trivial if the implicitly-declared function 4292 // would have been. 4293 MD->setTrivial(Trivial); 4294 } 4295 4296 if (ShouldDeleteSpecialMember(MD, CSM)) { 4297 if (First) { 4298 MD->setDeletedAsWritten(); 4299 } else { 4300 // C++11 [dcl.fct.def.default]p4: 4301 // [For a] user-provided explicitly-defaulted function [...] if such a 4302 // function is implicitly defined as deleted, the program is ill-formed. 4303 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4304 HadError = true; 4305 } 4306 } 4307 4308 if (HadError) 4309 MD->setInvalidDecl(); 4310} 4311 4312namespace { 4313struct SpecialMemberDeletionInfo { 4314 Sema &S; 4315 CXXMethodDecl *MD; 4316 Sema::CXXSpecialMember CSM; 4317 bool Diagnose; 4318 4319 // Properties of the special member, computed for convenience. 4320 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4321 SourceLocation Loc; 4322 4323 bool AllFieldsAreConst; 4324 4325 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4326 Sema::CXXSpecialMember CSM, bool Diagnose) 4327 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4328 IsConstructor(false), IsAssignment(false), IsMove(false), 4329 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4330 AllFieldsAreConst(true) { 4331 switch (CSM) { 4332 case Sema::CXXDefaultConstructor: 4333 case Sema::CXXCopyConstructor: 4334 IsConstructor = true; 4335 break; 4336 case Sema::CXXMoveConstructor: 4337 IsConstructor = true; 4338 IsMove = true; 4339 break; 4340 case Sema::CXXCopyAssignment: 4341 IsAssignment = true; 4342 break; 4343 case Sema::CXXMoveAssignment: 4344 IsAssignment = true; 4345 IsMove = true; 4346 break; 4347 case Sema::CXXDestructor: 4348 break; 4349 case Sema::CXXInvalid: 4350 llvm_unreachable("invalid special member kind"); 4351 } 4352 4353 if (MD->getNumParams()) { 4354 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4355 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4356 } 4357 } 4358 4359 bool inUnion() const { return MD->getParent()->isUnion(); } 4360 4361 /// Look up the corresponding special member in the given class. 4362 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4363 unsigned Quals) { 4364 unsigned TQ = MD->getTypeQualifiers(); 4365 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4366 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4367 Quals = 0; 4368 return S.LookupSpecialMember(Class, CSM, 4369 ConstArg || (Quals & Qualifiers::Const), 4370 VolatileArg || (Quals & Qualifiers::Volatile), 4371 MD->getRefQualifier() == RQ_RValue, 4372 TQ & Qualifiers::Const, 4373 TQ & Qualifiers::Volatile); 4374 } 4375 4376 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4377 4378 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4379 bool shouldDeleteForField(FieldDecl *FD); 4380 bool shouldDeleteForAllConstMembers(); 4381 4382 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4383 unsigned Quals); 4384 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4385 Sema::SpecialMemberOverloadResult *SMOR, 4386 bool IsDtorCallInCtor); 4387 4388 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4389}; 4390} 4391 4392/// Is the given special member inaccessible when used on the given 4393/// sub-object. 4394bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4395 CXXMethodDecl *target) { 4396 /// If we're operating on a base class, the object type is the 4397 /// type of this special member. 4398 QualType objectTy; 4399 AccessSpecifier access = target->getAccess(); 4400 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4401 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4402 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4403 4404 // If we're operating on a field, the object type is the type of the field. 4405 } else { 4406 objectTy = S.Context.getTypeDeclType(target->getParent()); 4407 } 4408 4409 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4410} 4411 4412/// Check whether we should delete a special member due to the implicit 4413/// definition containing a call to a special member of a subobject. 4414bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4415 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4416 bool IsDtorCallInCtor) { 4417 CXXMethodDecl *Decl = SMOR->getMethod(); 4418 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4419 4420 int DiagKind = -1; 4421 4422 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4423 DiagKind = !Decl ? 0 : 1; 4424 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4425 DiagKind = 2; 4426 else if (!isAccessible(Subobj, Decl)) 4427 DiagKind = 3; 4428 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4429 !Decl->isTrivial()) { 4430 // A member of a union must have a trivial corresponding special member. 4431 // As a weird special case, a destructor call from a union's constructor 4432 // must be accessible and non-deleted, but need not be trivial. Such a 4433 // destructor is never actually called, but is semantically checked as 4434 // if it were. 4435 DiagKind = 4; 4436 } 4437 4438 if (DiagKind == -1) 4439 return false; 4440 4441 if (Diagnose) { 4442 if (Field) { 4443 S.Diag(Field->getLocation(), 4444 diag::note_deleted_special_member_class_subobject) 4445 << CSM << MD->getParent() << /*IsField*/true 4446 << Field << DiagKind << IsDtorCallInCtor; 4447 } else { 4448 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4449 S.Diag(Base->getLocStart(), 4450 diag::note_deleted_special_member_class_subobject) 4451 << CSM << MD->getParent() << /*IsField*/false 4452 << Base->getType() << DiagKind << IsDtorCallInCtor; 4453 } 4454 4455 if (DiagKind == 1) 4456 S.NoteDeletedFunction(Decl); 4457 // FIXME: Explain inaccessibility if DiagKind == 3. 4458 } 4459 4460 return true; 4461} 4462 4463/// Check whether we should delete a special member function due to having a 4464/// direct or virtual base class or non-static data member of class type M. 4465bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4466 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 4467 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4468 4469 // C++11 [class.ctor]p5: 4470 // -- any direct or virtual base class, or non-static data member with no 4471 // brace-or-equal-initializer, has class type M (or array thereof) and 4472 // either M has no default constructor or overload resolution as applied 4473 // to M's default constructor results in an ambiguity or in a function 4474 // that is deleted or inaccessible 4475 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4476 // -- a direct or virtual base class B that cannot be copied/moved because 4477 // overload resolution, as applied to B's corresponding special member, 4478 // results in an ambiguity or a function that is deleted or inaccessible 4479 // from the defaulted special member 4480 // C++11 [class.dtor]p5: 4481 // -- any direct or virtual base class [...] has a type with a destructor 4482 // that is deleted or inaccessible 4483 if (!(CSM == Sema::CXXDefaultConstructor && 4484 Field && Field->hasInClassInitializer()) && 4485 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 4486 return true; 4487 4488 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4489 // -- any direct or virtual base class or non-static data member has a 4490 // type with a destructor that is deleted or inaccessible 4491 if (IsConstructor) { 4492 Sema::SpecialMemberOverloadResult *SMOR = 4493 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4494 false, false, false, false, false); 4495 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4496 return true; 4497 } 4498 4499 return false; 4500} 4501 4502/// Check whether we should delete a special member function due to the class 4503/// having a particular direct or virtual base class. 4504bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4505 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4506 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 4507} 4508 4509/// Check whether we should delete a special member function due to the class 4510/// having a particular non-static data member. 4511bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4512 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4513 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4514 4515 if (CSM == Sema::CXXDefaultConstructor) { 4516 // For a default constructor, all references must be initialized in-class 4517 // and, if a union, it must have a non-const member. 4518 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4519 if (Diagnose) 4520 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4521 << MD->getParent() << FD << FieldType << /*Reference*/0; 4522 return true; 4523 } 4524 // C++11 [class.ctor]p5: any non-variant non-static data member of 4525 // const-qualified type (or array thereof) with no 4526 // brace-or-equal-initializer does not have a user-provided default 4527 // constructor. 4528 if (!inUnion() && FieldType.isConstQualified() && 4529 !FD->hasInClassInitializer() && 4530 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4531 if (Diagnose) 4532 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4533 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4534 return true; 4535 } 4536 4537 if (inUnion() && !FieldType.isConstQualified()) 4538 AllFieldsAreConst = false; 4539 } else if (CSM == Sema::CXXCopyConstructor) { 4540 // For a copy constructor, data members must not be of rvalue reference 4541 // type. 4542 if (FieldType->isRValueReferenceType()) { 4543 if (Diagnose) 4544 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4545 << MD->getParent() << FD << FieldType; 4546 return true; 4547 } 4548 } else if (IsAssignment) { 4549 // For an assignment operator, data members must not be of reference type. 4550 if (FieldType->isReferenceType()) { 4551 if (Diagnose) 4552 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4553 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4554 return true; 4555 } 4556 if (!FieldRecord && FieldType.isConstQualified()) { 4557 // C++11 [class.copy]p23: 4558 // -- a non-static data member of const non-class type (or array thereof) 4559 if (Diagnose) 4560 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4561 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4562 return true; 4563 } 4564 } 4565 4566 if (FieldRecord) { 4567 // Some additional restrictions exist on the variant members. 4568 if (!inUnion() && FieldRecord->isUnion() && 4569 FieldRecord->isAnonymousStructOrUnion()) { 4570 bool AllVariantFieldsAreConst = true; 4571 4572 // FIXME: Handle anonymous unions declared within anonymous unions. 4573 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4574 UE = FieldRecord->field_end(); 4575 UI != UE; ++UI) { 4576 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4577 4578 if (!UnionFieldType.isConstQualified()) 4579 AllVariantFieldsAreConst = false; 4580 4581 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4582 if (UnionFieldRecord && 4583 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 4584 UnionFieldType.getCVRQualifiers())) 4585 return true; 4586 } 4587 4588 // At least one member in each anonymous union must be non-const 4589 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4590 FieldRecord->field_begin() != FieldRecord->field_end()) { 4591 if (Diagnose) 4592 S.Diag(FieldRecord->getLocation(), 4593 diag::note_deleted_default_ctor_all_const) 4594 << MD->getParent() << /*anonymous union*/1; 4595 return true; 4596 } 4597 4598 // Don't check the implicit member of the anonymous union type. 4599 // This is technically non-conformant, but sanity demands it. 4600 return false; 4601 } 4602 4603 if (shouldDeleteForClassSubobject(FieldRecord, FD, 4604 FieldType.getCVRQualifiers())) 4605 return true; 4606 } 4607 4608 return false; 4609} 4610 4611/// C++11 [class.ctor] p5: 4612/// A defaulted default constructor for a class X is defined as deleted if 4613/// X is a union and all of its variant members are of const-qualified type. 4614bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4615 // This is a silly definition, because it gives an empty union a deleted 4616 // default constructor. Don't do that. 4617 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4618 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4619 if (Diagnose) 4620 S.Diag(MD->getParent()->getLocation(), 4621 diag::note_deleted_default_ctor_all_const) 4622 << MD->getParent() << /*not anonymous union*/0; 4623 return true; 4624 } 4625 return false; 4626} 4627 4628/// Determine whether a defaulted special member function should be defined as 4629/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4630/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4631bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4632 bool Diagnose) { 4633 if (MD->isInvalidDecl()) 4634 return false; 4635 CXXRecordDecl *RD = MD->getParent(); 4636 assert(!RD->isDependentType() && "do deletion after instantiation"); 4637 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4638 return false; 4639 4640 // C++11 [expr.lambda.prim]p19: 4641 // The closure type associated with a lambda-expression has a 4642 // deleted (8.4.3) default constructor and a deleted copy 4643 // assignment operator. 4644 if (RD->isLambda() && 4645 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4646 if (Diagnose) 4647 Diag(RD->getLocation(), diag::note_lambda_decl); 4648 return true; 4649 } 4650 4651 // For an anonymous struct or union, the copy and assignment special members 4652 // will never be used, so skip the check. For an anonymous union declared at 4653 // namespace scope, the constructor and destructor are used. 4654 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4655 RD->isAnonymousStructOrUnion()) 4656 return false; 4657 4658 // C++11 [class.copy]p7, p18: 4659 // If the class definition declares a move constructor or move assignment 4660 // operator, an implicitly declared copy constructor or copy assignment 4661 // operator is defined as deleted. 4662 if (MD->isImplicit() && 4663 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4664 CXXMethodDecl *UserDeclaredMove = 0; 4665 4666 // In Microsoft mode, a user-declared move only causes the deletion of the 4667 // corresponding copy operation, not both copy operations. 4668 if (RD->hasUserDeclaredMoveConstructor() && 4669 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4670 if (!Diagnose) return true; 4671 UserDeclaredMove = RD->getMoveConstructor(); 4672 assert(UserDeclaredMove); 4673 } else if (RD->hasUserDeclaredMoveAssignment() && 4674 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4675 if (!Diagnose) return true; 4676 UserDeclaredMove = RD->getMoveAssignmentOperator(); 4677 assert(UserDeclaredMove); 4678 } 4679 4680 if (UserDeclaredMove) { 4681 Diag(UserDeclaredMove->getLocation(), 4682 diag::note_deleted_copy_user_declared_move) 4683 << (CSM == CXXCopyAssignment) << RD 4684 << UserDeclaredMove->isMoveAssignmentOperator(); 4685 return true; 4686 } 4687 } 4688 4689 // Do access control from the special member function 4690 ContextRAII MethodContext(*this, MD); 4691 4692 // C++11 [class.dtor]p5: 4693 // -- for a virtual destructor, lookup of the non-array deallocation function 4694 // results in an ambiguity or in a function that is deleted or inaccessible 4695 if (CSM == CXXDestructor && MD->isVirtual()) { 4696 FunctionDecl *OperatorDelete = 0; 4697 DeclarationName Name = 4698 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4699 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4700 OperatorDelete, false)) { 4701 if (Diagnose) 4702 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4703 return true; 4704 } 4705 } 4706 4707 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4708 4709 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4710 BE = RD->bases_end(); BI != BE; ++BI) 4711 if (!BI->isVirtual() && 4712 SMI.shouldDeleteForBase(BI)) 4713 return true; 4714 4715 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4716 BE = RD->vbases_end(); BI != BE; ++BI) 4717 if (SMI.shouldDeleteForBase(BI)) 4718 return true; 4719 4720 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4721 FE = RD->field_end(); FI != FE; ++FI) 4722 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4723 SMI.shouldDeleteForField(*FI)) 4724 return true; 4725 4726 if (SMI.shouldDeleteForAllConstMembers()) 4727 return true; 4728 4729 return false; 4730} 4731 4732/// \brief Data used with FindHiddenVirtualMethod 4733namespace { 4734 struct FindHiddenVirtualMethodData { 4735 Sema *S; 4736 CXXMethodDecl *Method; 4737 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4738 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4739 }; 4740} 4741 4742/// \brief Member lookup function that determines whether a given C++ 4743/// method overloads virtual methods in a base class without overriding any, 4744/// to be used with CXXRecordDecl::lookupInBases(). 4745static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4746 CXXBasePath &Path, 4747 void *UserData) { 4748 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4749 4750 FindHiddenVirtualMethodData &Data 4751 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4752 4753 DeclarationName Name = Data.Method->getDeclName(); 4754 assert(Name.getNameKind() == DeclarationName::Identifier); 4755 4756 bool foundSameNameMethod = false; 4757 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4758 for (Path.Decls = BaseRecord->lookup(Name); 4759 Path.Decls.first != Path.Decls.second; 4760 ++Path.Decls.first) { 4761 NamedDecl *D = *Path.Decls.first; 4762 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4763 MD = MD->getCanonicalDecl(); 4764 foundSameNameMethod = true; 4765 // Interested only in hidden virtual methods. 4766 if (!MD->isVirtual()) 4767 continue; 4768 // If the method we are checking overrides a method from its base 4769 // don't warn about the other overloaded methods. 4770 if (!Data.S->IsOverload(Data.Method, MD, false)) 4771 return true; 4772 // Collect the overload only if its hidden. 4773 bool Using = Data.OverridenAndUsingBaseMethods.count(MD); 4774 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4775 E = MD->end_overridden_methods(); 4776 I != E && !Using; ++I) 4777 Using = Data.OverridenAndUsingBaseMethods.count(*I); 4778 if (!Using) 4779 overloadedMethods.push_back(MD); 4780 } 4781 } 4782 4783 if (foundSameNameMethod) 4784 Data.OverloadedMethods.append(overloadedMethods.begin(), 4785 overloadedMethods.end()); 4786 return foundSameNameMethod; 4787} 4788 4789/// \brief See if a method overloads virtual methods in a base class without 4790/// overriding any. 4791void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4792 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4793 MD->getLocation()) == DiagnosticsEngine::Ignored) 4794 return; 4795 if (!MD->getDeclName().isIdentifier()) 4796 return; 4797 4798 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4799 /*bool RecordPaths=*/false, 4800 /*bool DetectVirtual=*/false); 4801 FindHiddenVirtualMethodData Data; 4802 Data.Method = MD; 4803 Data.S = this; 4804 4805 // Keep the base methods that were overriden or introduced in the subclass 4806 // by 'using' in a set. A base method not in this set is hidden. 4807 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4808 res.first != res.second; ++res.first) { 4809 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4810 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4811 E = MD->end_overridden_methods(); 4812 I != E; ++I) 4813 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4814 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4815 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4816 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4817 } 4818 4819 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4820 !Data.OverloadedMethods.empty()) { 4821 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4822 << MD << (Data.OverloadedMethods.size() > 1); 4823 4824 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4825 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4826 Diag(overloadedMD->getLocation(), 4827 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4828 } 4829 } 4830} 4831 4832void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4833 Decl *TagDecl, 4834 SourceLocation LBrac, 4835 SourceLocation RBrac, 4836 AttributeList *AttrList) { 4837 if (!TagDecl) 4838 return; 4839 4840 AdjustDeclIfTemplate(TagDecl); 4841 4842 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 4843 if (l->getKind() != AttributeList::AT_Visibility) 4844 continue; 4845 l->setInvalid(); 4846 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 4847 l->getName(); 4848 } 4849 4850 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4851 // strict aliasing violation! 4852 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4853 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4854 4855 CheckCompletedCXXClass( 4856 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4857} 4858 4859/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4860/// special functions, such as the default constructor, copy 4861/// constructor, or destructor, to the given C++ class (C++ 4862/// [special]p1). This routine can only be executed just before the 4863/// definition of the class is complete. 4864void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4865 if (!ClassDecl->hasUserDeclaredConstructor()) 4866 ++ASTContext::NumImplicitDefaultConstructors; 4867 4868 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4869 ++ASTContext::NumImplicitCopyConstructors; 4870 4871 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4872 ++ASTContext::NumImplicitMoveConstructors; 4873 4874 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4875 ++ASTContext::NumImplicitCopyAssignmentOperators; 4876 4877 // If we have a dynamic class, then the copy assignment operator may be 4878 // virtual, so we have to declare it immediately. This ensures that, e.g., 4879 // it shows up in the right place in the vtable and that we diagnose 4880 // problems with the implicit exception specification. 4881 if (ClassDecl->isDynamicClass()) 4882 DeclareImplicitCopyAssignment(ClassDecl); 4883 } 4884 4885 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()) { 4886 ++ASTContext::NumImplicitMoveAssignmentOperators; 4887 4888 // Likewise for the move assignment operator. 4889 if (ClassDecl->isDynamicClass()) 4890 DeclareImplicitMoveAssignment(ClassDecl); 4891 } 4892 4893 if (!ClassDecl->hasUserDeclaredDestructor()) { 4894 ++ASTContext::NumImplicitDestructors; 4895 4896 // If we have a dynamic class, then the destructor may be virtual, so we 4897 // have to declare the destructor immediately. This ensures that, e.g., it 4898 // shows up in the right place in the vtable and that we diagnose problems 4899 // with the implicit exception specification. 4900 if (ClassDecl->isDynamicClass()) 4901 DeclareImplicitDestructor(ClassDecl); 4902 } 4903} 4904 4905void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4906 if (!D) 4907 return; 4908 4909 int NumParamList = D->getNumTemplateParameterLists(); 4910 for (int i = 0; i < NumParamList; i++) { 4911 TemplateParameterList* Params = D->getTemplateParameterList(i); 4912 for (TemplateParameterList::iterator Param = Params->begin(), 4913 ParamEnd = Params->end(); 4914 Param != ParamEnd; ++Param) { 4915 NamedDecl *Named = cast<NamedDecl>(*Param); 4916 if (Named->getDeclName()) { 4917 S->AddDecl(Named); 4918 IdResolver.AddDecl(Named); 4919 } 4920 } 4921 } 4922} 4923 4924void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4925 if (!D) 4926 return; 4927 4928 TemplateParameterList *Params = 0; 4929 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4930 Params = Template->getTemplateParameters(); 4931 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4932 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4933 Params = PartialSpec->getTemplateParameters(); 4934 else 4935 return; 4936 4937 for (TemplateParameterList::iterator Param = Params->begin(), 4938 ParamEnd = Params->end(); 4939 Param != ParamEnd; ++Param) { 4940 NamedDecl *Named = cast<NamedDecl>(*Param); 4941 if (Named->getDeclName()) { 4942 S->AddDecl(Named); 4943 IdResolver.AddDecl(Named); 4944 } 4945 } 4946} 4947 4948void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4949 if (!RecordD) return; 4950 AdjustDeclIfTemplate(RecordD); 4951 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4952 PushDeclContext(S, Record); 4953} 4954 4955void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4956 if (!RecordD) return; 4957 PopDeclContext(); 4958} 4959 4960/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4961/// parsing a top-level (non-nested) C++ class, and we are now 4962/// parsing those parts of the given Method declaration that could 4963/// not be parsed earlier (C++ [class.mem]p2), such as default 4964/// arguments. This action should enter the scope of the given 4965/// Method declaration as if we had just parsed the qualified method 4966/// name. However, it should not bring the parameters into scope; 4967/// that will be performed by ActOnDelayedCXXMethodParameter. 4968void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4969} 4970 4971/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4972/// C++ method declaration. We're (re-)introducing the given 4973/// function parameter into scope for use in parsing later parts of 4974/// the method declaration. For example, we could see an 4975/// ActOnParamDefaultArgument event for this parameter. 4976void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4977 if (!ParamD) 4978 return; 4979 4980 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4981 4982 // If this parameter has an unparsed default argument, clear it out 4983 // to make way for the parsed default argument. 4984 if (Param->hasUnparsedDefaultArg()) 4985 Param->setDefaultArg(0); 4986 4987 S->AddDecl(Param); 4988 if (Param->getDeclName()) 4989 IdResolver.AddDecl(Param); 4990} 4991 4992/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4993/// processing the delayed method declaration for Method. The method 4994/// declaration is now considered finished. There may be a separate 4995/// ActOnStartOfFunctionDef action later (not necessarily 4996/// immediately!) for this method, if it was also defined inside the 4997/// class body. 4998void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4999 if (!MethodD) 5000 return; 5001 5002 AdjustDeclIfTemplate(MethodD); 5003 5004 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5005 5006 // Now that we have our default arguments, check the constructor 5007 // again. It could produce additional diagnostics or affect whether 5008 // the class has implicitly-declared destructors, among other 5009 // things. 5010 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5011 CheckConstructor(Constructor); 5012 5013 // Check the default arguments, which we may have added. 5014 if (!Method->isInvalidDecl()) 5015 CheckCXXDefaultArguments(Method); 5016} 5017 5018/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5019/// the well-formedness of the constructor declarator @p D with type @p 5020/// R. If there are any errors in the declarator, this routine will 5021/// emit diagnostics and set the invalid bit to true. In any case, the type 5022/// will be updated to reflect a well-formed type for the constructor and 5023/// returned. 5024QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5025 StorageClass &SC) { 5026 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5027 5028 // C++ [class.ctor]p3: 5029 // A constructor shall not be virtual (10.3) or static (9.4). A 5030 // constructor can be invoked for a const, volatile or const 5031 // volatile object. A constructor shall not be declared const, 5032 // volatile, or const volatile (9.3.2). 5033 if (isVirtual) { 5034 if (!D.isInvalidType()) 5035 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5036 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5037 << SourceRange(D.getIdentifierLoc()); 5038 D.setInvalidType(); 5039 } 5040 if (SC == SC_Static) { 5041 if (!D.isInvalidType()) 5042 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5043 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5044 << SourceRange(D.getIdentifierLoc()); 5045 D.setInvalidType(); 5046 SC = SC_None; 5047 } 5048 5049 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5050 if (FTI.TypeQuals != 0) { 5051 if (FTI.TypeQuals & Qualifiers::Const) 5052 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5053 << "const" << SourceRange(D.getIdentifierLoc()); 5054 if (FTI.TypeQuals & Qualifiers::Volatile) 5055 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5056 << "volatile" << SourceRange(D.getIdentifierLoc()); 5057 if (FTI.TypeQuals & Qualifiers::Restrict) 5058 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5059 << "restrict" << SourceRange(D.getIdentifierLoc()); 5060 D.setInvalidType(); 5061 } 5062 5063 // C++0x [class.ctor]p4: 5064 // A constructor shall not be declared with a ref-qualifier. 5065 if (FTI.hasRefQualifier()) { 5066 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5067 << FTI.RefQualifierIsLValueRef 5068 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5069 D.setInvalidType(); 5070 } 5071 5072 // Rebuild the function type "R" without any type qualifiers (in 5073 // case any of the errors above fired) and with "void" as the 5074 // return type, since constructors don't have return types. 5075 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5076 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5077 return R; 5078 5079 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5080 EPI.TypeQuals = 0; 5081 EPI.RefQualifier = RQ_None; 5082 5083 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5084 Proto->getNumArgs(), EPI); 5085} 5086 5087/// CheckConstructor - Checks a fully-formed constructor for 5088/// well-formedness, issuing any diagnostics required. Returns true if 5089/// the constructor declarator is invalid. 5090void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5091 CXXRecordDecl *ClassDecl 5092 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5093 if (!ClassDecl) 5094 return Constructor->setInvalidDecl(); 5095 5096 // C++ [class.copy]p3: 5097 // A declaration of a constructor for a class X is ill-formed if 5098 // its first parameter is of type (optionally cv-qualified) X and 5099 // either there are no other parameters or else all other 5100 // parameters have default arguments. 5101 if (!Constructor->isInvalidDecl() && 5102 ((Constructor->getNumParams() == 1) || 5103 (Constructor->getNumParams() > 1 && 5104 Constructor->getParamDecl(1)->hasDefaultArg())) && 5105 Constructor->getTemplateSpecializationKind() 5106 != TSK_ImplicitInstantiation) { 5107 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5108 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5109 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5110 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5111 const char *ConstRef 5112 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5113 : " const &"; 5114 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5115 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5116 5117 // FIXME: Rather that making the constructor invalid, we should endeavor 5118 // to fix the type. 5119 Constructor->setInvalidDecl(); 5120 } 5121 } 5122} 5123 5124/// CheckDestructor - Checks a fully-formed destructor definition for 5125/// well-formedness, issuing any diagnostics required. Returns true 5126/// on error. 5127bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5128 CXXRecordDecl *RD = Destructor->getParent(); 5129 5130 if (Destructor->isVirtual()) { 5131 SourceLocation Loc; 5132 5133 if (!Destructor->isImplicit()) 5134 Loc = Destructor->getLocation(); 5135 else 5136 Loc = RD->getLocation(); 5137 5138 // If we have a virtual destructor, look up the deallocation function 5139 FunctionDecl *OperatorDelete = 0; 5140 DeclarationName Name = 5141 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5142 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5143 return true; 5144 5145 MarkFunctionReferenced(Loc, OperatorDelete); 5146 5147 Destructor->setOperatorDelete(OperatorDelete); 5148 } 5149 5150 return false; 5151} 5152 5153static inline bool 5154FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5155 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5156 FTI.ArgInfo[0].Param && 5157 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5158} 5159 5160/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5161/// the well-formednes of the destructor declarator @p D with type @p 5162/// R. If there are any errors in the declarator, this routine will 5163/// emit diagnostics and set the declarator to invalid. Even if this happens, 5164/// will be updated to reflect a well-formed type for the destructor and 5165/// returned. 5166QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5167 StorageClass& SC) { 5168 // C++ [class.dtor]p1: 5169 // [...] A typedef-name that names a class is a class-name 5170 // (7.1.3); however, a typedef-name that names a class shall not 5171 // be used as the identifier in the declarator for a destructor 5172 // declaration. 5173 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5174 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5175 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5176 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5177 else if (const TemplateSpecializationType *TST = 5178 DeclaratorType->getAs<TemplateSpecializationType>()) 5179 if (TST->isTypeAlias()) 5180 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5181 << DeclaratorType << 1; 5182 5183 // C++ [class.dtor]p2: 5184 // A destructor is used to destroy objects of its class type. A 5185 // destructor takes no parameters, and no return type can be 5186 // specified for it (not even void). The address of a destructor 5187 // shall not be taken. A destructor shall not be static. A 5188 // destructor can be invoked for a const, volatile or const 5189 // volatile object. A destructor shall not be declared const, 5190 // volatile or const volatile (9.3.2). 5191 if (SC == SC_Static) { 5192 if (!D.isInvalidType()) 5193 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5194 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5195 << SourceRange(D.getIdentifierLoc()) 5196 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5197 5198 SC = SC_None; 5199 } 5200 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5201 // Destructors don't have return types, but the parser will 5202 // happily parse something like: 5203 // 5204 // class X { 5205 // float ~X(); 5206 // }; 5207 // 5208 // The return type will be eliminated later. 5209 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5210 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5211 << SourceRange(D.getIdentifierLoc()); 5212 } 5213 5214 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5215 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5216 if (FTI.TypeQuals & Qualifiers::Const) 5217 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5218 << "const" << SourceRange(D.getIdentifierLoc()); 5219 if (FTI.TypeQuals & Qualifiers::Volatile) 5220 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5221 << "volatile" << SourceRange(D.getIdentifierLoc()); 5222 if (FTI.TypeQuals & Qualifiers::Restrict) 5223 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5224 << "restrict" << SourceRange(D.getIdentifierLoc()); 5225 D.setInvalidType(); 5226 } 5227 5228 // C++0x [class.dtor]p2: 5229 // A destructor shall not be declared with a ref-qualifier. 5230 if (FTI.hasRefQualifier()) { 5231 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5232 << FTI.RefQualifierIsLValueRef 5233 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5234 D.setInvalidType(); 5235 } 5236 5237 // Make sure we don't have any parameters. 5238 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5239 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5240 5241 // Delete the parameters. 5242 FTI.freeArgs(); 5243 D.setInvalidType(); 5244 } 5245 5246 // Make sure the destructor isn't variadic. 5247 if (FTI.isVariadic) { 5248 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5249 D.setInvalidType(); 5250 } 5251 5252 // Rebuild the function type "R" without any type qualifiers or 5253 // parameters (in case any of the errors above fired) and with 5254 // "void" as the return type, since destructors don't have return 5255 // types. 5256 if (!D.isInvalidType()) 5257 return R; 5258 5259 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5260 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5261 EPI.Variadic = false; 5262 EPI.TypeQuals = 0; 5263 EPI.RefQualifier = RQ_None; 5264 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5265} 5266 5267/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5268/// well-formednes of the conversion function declarator @p D with 5269/// type @p R. If there are any errors in the declarator, this routine 5270/// will emit diagnostics and return true. Otherwise, it will return 5271/// false. Either way, the type @p R will be updated to reflect a 5272/// well-formed type for the conversion operator. 5273void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5274 StorageClass& SC) { 5275 // C++ [class.conv.fct]p1: 5276 // Neither parameter types nor return type can be specified. The 5277 // type of a conversion function (8.3.5) is "function taking no 5278 // parameter returning conversion-type-id." 5279 if (SC == SC_Static) { 5280 if (!D.isInvalidType()) 5281 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5282 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5283 << SourceRange(D.getIdentifierLoc()); 5284 D.setInvalidType(); 5285 SC = SC_None; 5286 } 5287 5288 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5289 5290 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5291 // Conversion functions don't have return types, but the parser will 5292 // happily parse something like: 5293 // 5294 // class X { 5295 // float operator bool(); 5296 // }; 5297 // 5298 // The return type will be changed later anyway. 5299 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5300 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5301 << SourceRange(D.getIdentifierLoc()); 5302 D.setInvalidType(); 5303 } 5304 5305 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5306 5307 // Make sure we don't have any parameters. 5308 if (Proto->getNumArgs() > 0) { 5309 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5310 5311 // Delete the parameters. 5312 D.getFunctionTypeInfo().freeArgs(); 5313 D.setInvalidType(); 5314 } else if (Proto->isVariadic()) { 5315 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5316 D.setInvalidType(); 5317 } 5318 5319 // Diagnose "&operator bool()" and other such nonsense. This 5320 // is actually a gcc extension which we don't support. 5321 if (Proto->getResultType() != ConvType) { 5322 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5323 << Proto->getResultType(); 5324 D.setInvalidType(); 5325 ConvType = Proto->getResultType(); 5326 } 5327 5328 // C++ [class.conv.fct]p4: 5329 // The conversion-type-id shall not represent a function type nor 5330 // an array type. 5331 if (ConvType->isArrayType()) { 5332 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5333 ConvType = Context.getPointerType(ConvType); 5334 D.setInvalidType(); 5335 } else if (ConvType->isFunctionType()) { 5336 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5337 ConvType = Context.getPointerType(ConvType); 5338 D.setInvalidType(); 5339 } 5340 5341 // Rebuild the function type "R" without any parameters (in case any 5342 // of the errors above fired) and with the conversion type as the 5343 // return type. 5344 if (D.isInvalidType()) 5345 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5346 5347 // C++0x explicit conversion operators. 5348 if (D.getDeclSpec().isExplicitSpecified()) 5349 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5350 getLangOpts().CPlusPlus0x ? 5351 diag::warn_cxx98_compat_explicit_conversion_functions : 5352 diag::ext_explicit_conversion_functions) 5353 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5354} 5355 5356/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5357/// the declaration of the given C++ conversion function. This routine 5358/// is responsible for recording the conversion function in the C++ 5359/// class, if possible. 5360Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5361 assert(Conversion && "Expected to receive a conversion function declaration"); 5362 5363 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5364 5365 // Make sure we aren't redeclaring the conversion function. 5366 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5367 5368 // C++ [class.conv.fct]p1: 5369 // [...] A conversion function is never used to convert a 5370 // (possibly cv-qualified) object to the (possibly cv-qualified) 5371 // same object type (or a reference to it), to a (possibly 5372 // cv-qualified) base class of that type (or a reference to it), 5373 // or to (possibly cv-qualified) void. 5374 // FIXME: Suppress this warning if the conversion function ends up being a 5375 // virtual function that overrides a virtual function in a base class. 5376 QualType ClassType 5377 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5378 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5379 ConvType = ConvTypeRef->getPointeeType(); 5380 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5381 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5382 /* Suppress diagnostics for instantiations. */; 5383 else if (ConvType->isRecordType()) { 5384 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5385 if (ConvType == ClassType) 5386 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5387 << ClassType; 5388 else if (IsDerivedFrom(ClassType, ConvType)) 5389 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5390 << ClassType << ConvType; 5391 } else if (ConvType->isVoidType()) { 5392 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5393 << ClassType << ConvType; 5394 } 5395 5396 if (FunctionTemplateDecl *ConversionTemplate 5397 = Conversion->getDescribedFunctionTemplate()) 5398 return ConversionTemplate; 5399 5400 return Conversion; 5401} 5402 5403//===----------------------------------------------------------------------===// 5404// Namespace Handling 5405//===----------------------------------------------------------------------===// 5406 5407/// \brief Diagnose a mismatch in 'inline' qualifiers when a namespace is 5408/// reopened. 5409static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc, 5410 SourceLocation Loc, 5411 IdentifierInfo *II, bool *IsInline, 5412 NamespaceDecl *PrevNS) { 5413 assert(*IsInline != PrevNS->isInline()); 5414 5415 // HACK: Work around a bug in libstdc++4.6's <atomic>, where 5416 // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as 5417 // inline namespaces, with the intention of bringing names into namespace std. 5418 // 5419 // We support this just well enough to get that case working; this is not 5420 // sufficient to support reopening namespaces as inline in general. 5421 if (*IsInline && II && II->getName().startswith("__atomic") && 5422 S.getSourceManager().isInSystemHeader(Loc)) { 5423 // Mark all prior declarations of the namespace as inline. 5424 for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS; 5425 NS = NS->getPreviousDecl()) 5426 NS->setInline(*IsInline); 5427 // Patch up the lookup table for the containing namespace. This isn't really 5428 // correct, but it's good enough for this particular case. 5429 for (DeclContext::decl_iterator I = PrevNS->decls_begin(), 5430 E = PrevNS->decls_end(); I != E; ++I) 5431 if (NamedDecl *ND = dyn_cast<NamedDecl>(*I)) 5432 PrevNS->getParent()->makeDeclVisibleInContext(ND); 5433 return; 5434 } 5435 5436 if (PrevNS->isInline()) 5437 // The user probably just forgot the 'inline', so suggest that it 5438 // be added back. 5439 S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5440 << FixItHint::CreateInsertion(KeywordLoc, "inline "); 5441 else 5442 S.Diag(Loc, diag::err_inline_namespace_mismatch) 5443 << IsInline; 5444 5445 S.Diag(PrevNS->getLocation(), diag::note_previous_definition); 5446 *IsInline = PrevNS->isInline(); 5447} 5448 5449/// ActOnStartNamespaceDef - This is called at the start of a namespace 5450/// definition. 5451Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5452 SourceLocation InlineLoc, 5453 SourceLocation NamespaceLoc, 5454 SourceLocation IdentLoc, 5455 IdentifierInfo *II, 5456 SourceLocation LBrace, 5457 AttributeList *AttrList) { 5458 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5459 // For anonymous namespace, take the location of the left brace. 5460 SourceLocation Loc = II ? IdentLoc : LBrace; 5461 bool IsInline = InlineLoc.isValid(); 5462 bool IsInvalid = false; 5463 bool IsStd = false; 5464 bool AddToKnown = false; 5465 Scope *DeclRegionScope = NamespcScope->getParent(); 5466 5467 NamespaceDecl *PrevNS = 0; 5468 if (II) { 5469 // C++ [namespace.def]p2: 5470 // The identifier in an original-namespace-definition shall not 5471 // have been previously defined in the declarative region in 5472 // which the original-namespace-definition appears. The 5473 // identifier in an original-namespace-definition is the name of 5474 // the namespace. Subsequently in that declarative region, it is 5475 // treated as an original-namespace-name. 5476 // 5477 // Since namespace names are unique in their scope, and we don't 5478 // look through using directives, just look for any ordinary names. 5479 5480 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5481 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5482 Decl::IDNS_Namespace; 5483 NamedDecl *PrevDecl = 0; 5484 for (DeclContext::lookup_result R 5485 = CurContext->getRedeclContext()->lookup(II); 5486 R.first != R.second; ++R.first) { 5487 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5488 PrevDecl = *R.first; 5489 break; 5490 } 5491 } 5492 5493 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5494 5495 if (PrevNS) { 5496 // This is an extended namespace definition. 5497 if (IsInline != PrevNS->isInline()) 5498 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II, 5499 &IsInline, PrevNS); 5500 } else if (PrevDecl) { 5501 // This is an invalid name redefinition. 5502 Diag(Loc, diag::err_redefinition_different_kind) 5503 << II; 5504 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5505 IsInvalid = true; 5506 // Continue on to push Namespc as current DeclContext and return it. 5507 } else if (II->isStr("std") && 5508 CurContext->getRedeclContext()->isTranslationUnit()) { 5509 // This is the first "real" definition of the namespace "std", so update 5510 // our cache of the "std" namespace to point at this definition. 5511 PrevNS = getStdNamespace(); 5512 IsStd = true; 5513 AddToKnown = !IsInline; 5514 } else { 5515 // We've seen this namespace for the first time. 5516 AddToKnown = !IsInline; 5517 } 5518 } else { 5519 // Anonymous namespaces. 5520 5521 // Determine whether the parent already has an anonymous namespace. 5522 DeclContext *Parent = CurContext->getRedeclContext(); 5523 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5524 PrevNS = TU->getAnonymousNamespace(); 5525 } else { 5526 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5527 PrevNS = ND->getAnonymousNamespace(); 5528 } 5529 5530 if (PrevNS && IsInline != PrevNS->isInline()) 5531 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II, 5532 &IsInline, PrevNS); 5533 } 5534 5535 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5536 StartLoc, Loc, II, PrevNS); 5537 if (IsInvalid) 5538 Namespc->setInvalidDecl(); 5539 5540 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5541 5542 // FIXME: Should we be merging attributes? 5543 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5544 PushNamespaceVisibilityAttr(Attr, Loc); 5545 5546 if (IsStd) 5547 StdNamespace = Namespc; 5548 if (AddToKnown) 5549 KnownNamespaces[Namespc] = false; 5550 5551 if (II) { 5552 PushOnScopeChains(Namespc, DeclRegionScope); 5553 } else { 5554 // Link the anonymous namespace into its parent. 5555 DeclContext *Parent = CurContext->getRedeclContext(); 5556 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5557 TU->setAnonymousNamespace(Namespc); 5558 } else { 5559 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5560 } 5561 5562 CurContext->addDecl(Namespc); 5563 5564 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5565 // behaves as if it were replaced by 5566 // namespace unique { /* empty body */ } 5567 // using namespace unique; 5568 // namespace unique { namespace-body } 5569 // where all occurrences of 'unique' in a translation unit are 5570 // replaced by the same identifier and this identifier differs 5571 // from all other identifiers in the entire program. 5572 5573 // We just create the namespace with an empty name and then add an 5574 // implicit using declaration, just like the standard suggests. 5575 // 5576 // CodeGen enforces the "universally unique" aspect by giving all 5577 // declarations semantically contained within an anonymous 5578 // namespace internal linkage. 5579 5580 if (!PrevNS) { 5581 UsingDirectiveDecl* UD 5582 = UsingDirectiveDecl::Create(Context, CurContext, 5583 /* 'using' */ LBrace, 5584 /* 'namespace' */ SourceLocation(), 5585 /* qualifier */ NestedNameSpecifierLoc(), 5586 /* identifier */ SourceLocation(), 5587 Namespc, 5588 /* Ancestor */ CurContext); 5589 UD->setImplicit(); 5590 CurContext->addDecl(UD); 5591 } 5592 } 5593 5594 ActOnDocumentableDecl(Namespc); 5595 5596 // Although we could have an invalid decl (i.e. the namespace name is a 5597 // redefinition), push it as current DeclContext and try to continue parsing. 5598 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5599 // for the namespace has the declarations that showed up in that particular 5600 // namespace definition. 5601 PushDeclContext(NamespcScope, Namespc); 5602 return Namespc; 5603} 5604 5605/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5606/// is a namespace alias, returns the namespace it points to. 5607static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5608 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5609 return AD->getNamespace(); 5610 return dyn_cast_or_null<NamespaceDecl>(D); 5611} 5612 5613/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5614/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5615void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5616 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5617 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5618 Namespc->setRBraceLoc(RBrace); 5619 PopDeclContext(); 5620 if (Namespc->hasAttr<VisibilityAttr>()) 5621 PopPragmaVisibility(true, RBrace); 5622} 5623 5624CXXRecordDecl *Sema::getStdBadAlloc() const { 5625 return cast_or_null<CXXRecordDecl>( 5626 StdBadAlloc.get(Context.getExternalSource())); 5627} 5628 5629NamespaceDecl *Sema::getStdNamespace() const { 5630 return cast_or_null<NamespaceDecl>( 5631 StdNamespace.get(Context.getExternalSource())); 5632} 5633 5634/// \brief Retrieve the special "std" namespace, which may require us to 5635/// implicitly define the namespace. 5636NamespaceDecl *Sema::getOrCreateStdNamespace() { 5637 if (!StdNamespace) { 5638 // The "std" namespace has not yet been defined, so build one implicitly. 5639 StdNamespace = NamespaceDecl::Create(Context, 5640 Context.getTranslationUnitDecl(), 5641 /*Inline=*/false, 5642 SourceLocation(), SourceLocation(), 5643 &PP.getIdentifierTable().get("std"), 5644 /*PrevDecl=*/0); 5645 getStdNamespace()->setImplicit(true); 5646 } 5647 5648 return getStdNamespace(); 5649} 5650 5651bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5652 assert(getLangOpts().CPlusPlus && 5653 "Looking for std::initializer_list outside of C++."); 5654 5655 // We're looking for implicit instantiations of 5656 // template <typename E> class std::initializer_list. 5657 5658 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5659 return false; 5660 5661 ClassTemplateDecl *Template = 0; 5662 const TemplateArgument *Arguments = 0; 5663 5664 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5665 5666 ClassTemplateSpecializationDecl *Specialization = 5667 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5668 if (!Specialization) 5669 return false; 5670 5671 Template = Specialization->getSpecializedTemplate(); 5672 Arguments = Specialization->getTemplateArgs().data(); 5673 } else if (const TemplateSpecializationType *TST = 5674 Ty->getAs<TemplateSpecializationType>()) { 5675 Template = dyn_cast_or_null<ClassTemplateDecl>( 5676 TST->getTemplateName().getAsTemplateDecl()); 5677 Arguments = TST->getArgs(); 5678 } 5679 if (!Template) 5680 return false; 5681 5682 if (!StdInitializerList) { 5683 // Haven't recognized std::initializer_list yet, maybe this is it. 5684 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5685 if (TemplateClass->getIdentifier() != 5686 &PP.getIdentifierTable().get("initializer_list") || 5687 !getStdNamespace()->InEnclosingNamespaceSetOf( 5688 TemplateClass->getDeclContext())) 5689 return false; 5690 // This is a template called std::initializer_list, but is it the right 5691 // template? 5692 TemplateParameterList *Params = Template->getTemplateParameters(); 5693 if (Params->getMinRequiredArguments() != 1) 5694 return false; 5695 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5696 return false; 5697 5698 // It's the right template. 5699 StdInitializerList = Template; 5700 } 5701 5702 if (Template != StdInitializerList) 5703 return false; 5704 5705 // This is an instance of std::initializer_list. Find the argument type. 5706 if (Element) 5707 *Element = Arguments[0].getAsType(); 5708 return true; 5709} 5710 5711static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5712 NamespaceDecl *Std = S.getStdNamespace(); 5713 if (!Std) { 5714 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5715 return 0; 5716 } 5717 5718 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5719 Loc, Sema::LookupOrdinaryName); 5720 if (!S.LookupQualifiedName(Result, Std)) { 5721 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5722 return 0; 5723 } 5724 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5725 if (!Template) { 5726 Result.suppressDiagnostics(); 5727 // We found something weird. Complain about the first thing we found. 5728 NamedDecl *Found = *Result.begin(); 5729 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5730 return 0; 5731 } 5732 5733 // We found some template called std::initializer_list. Now verify that it's 5734 // correct. 5735 TemplateParameterList *Params = Template->getTemplateParameters(); 5736 if (Params->getMinRequiredArguments() != 1 || 5737 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5738 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5739 return 0; 5740 } 5741 5742 return Template; 5743} 5744 5745QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5746 if (!StdInitializerList) { 5747 StdInitializerList = LookupStdInitializerList(*this, Loc); 5748 if (!StdInitializerList) 5749 return QualType(); 5750 } 5751 5752 TemplateArgumentListInfo Args(Loc, Loc); 5753 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5754 Context.getTrivialTypeSourceInfo(Element, 5755 Loc))); 5756 return Context.getCanonicalType( 5757 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5758} 5759 5760bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5761 // C++ [dcl.init.list]p2: 5762 // A constructor is an initializer-list constructor if its first parameter 5763 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5764 // std::initializer_list<E> for some type E, and either there are no other 5765 // parameters or else all other parameters have default arguments. 5766 if (Ctor->getNumParams() < 1 || 5767 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5768 return false; 5769 5770 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5771 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5772 ArgType = RT->getPointeeType().getUnqualifiedType(); 5773 5774 return isStdInitializerList(ArgType, 0); 5775} 5776 5777/// \brief Determine whether a using statement is in a context where it will be 5778/// apply in all contexts. 5779static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5780 switch (CurContext->getDeclKind()) { 5781 case Decl::TranslationUnit: 5782 return true; 5783 case Decl::LinkageSpec: 5784 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5785 default: 5786 return false; 5787 } 5788} 5789 5790namespace { 5791 5792// Callback to only accept typo corrections that are namespaces. 5793class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5794 public: 5795 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5796 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5797 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5798 } 5799 return false; 5800 } 5801}; 5802 5803} 5804 5805static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5806 CXXScopeSpec &SS, 5807 SourceLocation IdentLoc, 5808 IdentifierInfo *Ident) { 5809 NamespaceValidatorCCC Validator; 5810 R.clear(); 5811 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5812 R.getLookupKind(), Sc, &SS, 5813 Validator)) { 5814 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 5815 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 5816 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5817 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5818 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5819 << FixItHint::CreateReplacement(Corrected.getCorrectionRange(), 5820 CorrectedStr); 5821 else 5822 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5823 << Ident << CorrectedQuotedStr 5824 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5825 5826 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5827 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5828 5829 R.addDecl(Corrected.getCorrectionDecl()); 5830 return true; 5831 } 5832 return false; 5833} 5834 5835Decl *Sema::ActOnUsingDirective(Scope *S, 5836 SourceLocation UsingLoc, 5837 SourceLocation NamespcLoc, 5838 CXXScopeSpec &SS, 5839 SourceLocation IdentLoc, 5840 IdentifierInfo *NamespcName, 5841 AttributeList *AttrList) { 5842 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5843 assert(NamespcName && "Invalid NamespcName."); 5844 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5845 5846 // This can only happen along a recovery path. 5847 while (S->getFlags() & Scope::TemplateParamScope) 5848 S = S->getParent(); 5849 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5850 5851 UsingDirectiveDecl *UDir = 0; 5852 NestedNameSpecifier *Qualifier = 0; 5853 if (SS.isSet()) 5854 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5855 5856 // Lookup namespace name. 5857 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5858 LookupParsedName(R, S, &SS); 5859 if (R.isAmbiguous()) 5860 return 0; 5861 5862 if (R.empty()) { 5863 R.clear(); 5864 // Allow "using namespace std;" or "using namespace ::std;" even if 5865 // "std" hasn't been defined yet, for GCC compatibility. 5866 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5867 NamespcName->isStr("std")) { 5868 Diag(IdentLoc, diag::ext_using_undefined_std); 5869 R.addDecl(getOrCreateStdNamespace()); 5870 R.resolveKind(); 5871 } 5872 // Otherwise, attempt typo correction. 5873 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5874 } 5875 5876 if (!R.empty()) { 5877 NamedDecl *Named = R.getFoundDecl(); 5878 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5879 && "expected namespace decl"); 5880 // C++ [namespace.udir]p1: 5881 // A using-directive specifies that the names in the nominated 5882 // namespace can be used in the scope in which the 5883 // using-directive appears after the using-directive. During 5884 // unqualified name lookup (3.4.1), the names appear as if they 5885 // were declared in the nearest enclosing namespace which 5886 // contains both the using-directive and the nominated 5887 // namespace. [Note: in this context, "contains" means "contains 5888 // directly or indirectly". ] 5889 5890 // Find enclosing context containing both using-directive and 5891 // nominated namespace. 5892 NamespaceDecl *NS = getNamespaceDecl(Named); 5893 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5894 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5895 CommonAncestor = CommonAncestor->getParent(); 5896 5897 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5898 SS.getWithLocInContext(Context), 5899 IdentLoc, Named, CommonAncestor); 5900 5901 if (IsUsingDirectiveInToplevelContext(CurContext) && 5902 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5903 Diag(IdentLoc, diag::warn_using_directive_in_header); 5904 } 5905 5906 PushUsingDirective(S, UDir); 5907 } else { 5908 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5909 } 5910 5911 // FIXME: We ignore attributes for now. 5912 return UDir; 5913} 5914 5915void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5916 // If the scope has an associated entity and the using directive is at 5917 // namespace or translation unit scope, add the UsingDirectiveDecl into 5918 // its lookup structure so qualified name lookup can find it. 5919 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 5920 if (Ctx && !Ctx->isFunctionOrMethod()) 5921 Ctx->addDecl(UDir); 5922 else 5923 // Otherwise, it is at block sope. The using-directives will affect lookup 5924 // only to the end of the scope. 5925 S->PushUsingDirective(UDir); 5926} 5927 5928 5929Decl *Sema::ActOnUsingDeclaration(Scope *S, 5930 AccessSpecifier AS, 5931 bool HasUsingKeyword, 5932 SourceLocation UsingLoc, 5933 CXXScopeSpec &SS, 5934 UnqualifiedId &Name, 5935 AttributeList *AttrList, 5936 bool IsTypeName, 5937 SourceLocation TypenameLoc) { 5938 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5939 5940 switch (Name.getKind()) { 5941 case UnqualifiedId::IK_ImplicitSelfParam: 5942 case UnqualifiedId::IK_Identifier: 5943 case UnqualifiedId::IK_OperatorFunctionId: 5944 case UnqualifiedId::IK_LiteralOperatorId: 5945 case UnqualifiedId::IK_ConversionFunctionId: 5946 break; 5947 5948 case UnqualifiedId::IK_ConstructorName: 5949 case UnqualifiedId::IK_ConstructorTemplateId: 5950 // C++11 inheriting constructors. 5951 Diag(Name.getLocStart(), 5952 getLangOpts().CPlusPlus0x ? 5953 // FIXME: Produce warn_cxx98_compat_using_decl_constructor 5954 // instead once inheriting constructors work. 5955 diag::err_using_decl_constructor_unsupported : 5956 diag::err_using_decl_constructor) 5957 << SS.getRange(); 5958 5959 if (getLangOpts().CPlusPlus0x) break; 5960 5961 return 0; 5962 5963 case UnqualifiedId::IK_DestructorName: 5964 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 5965 << SS.getRange(); 5966 return 0; 5967 5968 case UnqualifiedId::IK_TemplateId: 5969 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 5970 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5971 return 0; 5972 } 5973 5974 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5975 DeclarationName TargetName = TargetNameInfo.getName(); 5976 if (!TargetName) 5977 return 0; 5978 5979 // Warn about using declarations. 5980 // TODO: store that the declaration was written without 'using' and 5981 // talk about access decls instead of using decls in the 5982 // diagnostics. 5983 if (!HasUsingKeyword) { 5984 UsingLoc = Name.getLocStart(); 5985 5986 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5987 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5988 } 5989 5990 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5991 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5992 return 0; 5993 5994 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5995 TargetNameInfo, AttrList, 5996 /* IsInstantiation */ false, 5997 IsTypeName, TypenameLoc); 5998 if (UD) 5999 PushOnScopeChains(UD, S, /*AddToContext*/ false); 6000 6001 return UD; 6002} 6003 6004/// \brief Determine whether a using declaration considers the given 6005/// declarations as "equivalent", e.g., if they are redeclarations of 6006/// the same entity or are both typedefs of the same type. 6007static bool 6008IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 6009 bool &SuppressRedeclaration) { 6010 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 6011 SuppressRedeclaration = false; 6012 return true; 6013 } 6014 6015 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 6016 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6017 SuppressRedeclaration = true; 6018 return Context.hasSameType(TD1->getUnderlyingType(), 6019 TD2->getUnderlyingType()); 6020 } 6021 6022 return false; 6023} 6024 6025 6026/// Determines whether to create a using shadow decl for a particular 6027/// decl, given the set of decls existing prior to this using lookup. 6028bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6029 const LookupResult &Previous) { 6030 // Diagnose finding a decl which is not from a base class of the 6031 // current class. We do this now because there are cases where this 6032 // function will silently decide not to build a shadow decl, which 6033 // will pre-empt further diagnostics. 6034 // 6035 // We don't need to do this in C++0x because we do the check once on 6036 // the qualifier. 6037 // 6038 // FIXME: diagnose the following if we care enough: 6039 // struct A { int foo; }; 6040 // struct B : A { using A::foo; }; 6041 // template <class T> struct C : A {}; 6042 // template <class T> struct D : C<T> { using B::foo; } // <--- 6043 // This is invalid (during instantiation) in C++03 because B::foo 6044 // resolves to the using decl in B, which is not a base class of D<T>. 6045 // We can't diagnose it immediately because C<T> is an unknown 6046 // specialization. The UsingShadowDecl in D<T> then points directly 6047 // to A::foo, which will look well-formed when we instantiate. 6048 // The right solution is to not collapse the shadow-decl chain. 6049 if (!getLangOpts().CPlusPlus0x && CurContext->isRecord()) { 6050 DeclContext *OrigDC = Orig->getDeclContext(); 6051 6052 // Handle enums and anonymous structs. 6053 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6054 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6055 while (OrigRec->isAnonymousStructOrUnion()) 6056 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6057 6058 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6059 if (OrigDC == CurContext) { 6060 Diag(Using->getLocation(), 6061 diag::err_using_decl_nested_name_specifier_is_current_class) 6062 << Using->getQualifierLoc().getSourceRange(); 6063 Diag(Orig->getLocation(), diag::note_using_decl_target); 6064 return true; 6065 } 6066 6067 Diag(Using->getQualifierLoc().getBeginLoc(), 6068 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6069 << Using->getQualifier() 6070 << cast<CXXRecordDecl>(CurContext) 6071 << Using->getQualifierLoc().getSourceRange(); 6072 Diag(Orig->getLocation(), diag::note_using_decl_target); 6073 return true; 6074 } 6075 } 6076 6077 if (Previous.empty()) return false; 6078 6079 NamedDecl *Target = Orig; 6080 if (isa<UsingShadowDecl>(Target)) 6081 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6082 6083 // If the target happens to be one of the previous declarations, we 6084 // don't have a conflict. 6085 // 6086 // FIXME: but we might be increasing its access, in which case we 6087 // should redeclare it. 6088 NamedDecl *NonTag = 0, *Tag = 0; 6089 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6090 I != E; ++I) { 6091 NamedDecl *D = (*I)->getUnderlyingDecl(); 6092 bool Result; 6093 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6094 return Result; 6095 6096 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6097 } 6098 6099 if (Target->isFunctionOrFunctionTemplate()) { 6100 FunctionDecl *FD; 6101 if (isa<FunctionTemplateDecl>(Target)) 6102 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6103 else 6104 FD = cast<FunctionDecl>(Target); 6105 6106 NamedDecl *OldDecl = 0; 6107 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6108 case Ovl_Overload: 6109 return false; 6110 6111 case Ovl_NonFunction: 6112 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6113 break; 6114 6115 // We found a decl with the exact signature. 6116 case Ovl_Match: 6117 // If we're in a record, we want to hide the target, so we 6118 // return true (without a diagnostic) to tell the caller not to 6119 // build a shadow decl. 6120 if (CurContext->isRecord()) 6121 return true; 6122 6123 // If we're not in a record, this is an error. 6124 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6125 break; 6126 } 6127 6128 Diag(Target->getLocation(), diag::note_using_decl_target); 6129 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6130 return true; 6131 } 6132 6133 // Target is not a function. 6134 6135 if (isa<TagDecl>(Target)) { 6136 // No conflict between a tag and a non-tag. 6137 if (!Tag) return false; 6138 6139 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6140 Diag(Target->getLocation(), diag::note_using_decl_target); 6141 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6142 return true; 6143 } 6144 6145 // No conflict between a tag and a non-tag. 6146 if (!NonTag) return false; 6147 6148 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6149 Diag(Target->getLocation(), diag::note_using_decl_target); 6150 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6151 return true; 6152} 6153 6154/// Builds a shadow declaration corresponding to a 'using' declaration. 6155UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6156 UsingDecl *UD, 6157 NamedDecl *Orig) { 6158 6159 // If we resolved to another shadow declaration, just coalesce them. 6160 NamedDecl *Target = Orig; 6161 if (isa<UsingShadowDecl>(Target)) { 6162 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6163 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6164 } 6165 6166 UsingShadowDecl *Shadow 6167 = UsingShadowDecl::Create(Context, CurContext, 6168 UD->getLocation(), UD, Target); 6169 UD->addShadowDecl(Shadow); 6170 6171 Shadow->setAccess(UD->getAccess()); 6172 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6173 Shadow->setInvalidDecl(); 6174 6175 if (S) 6176 PushOnScopeChains(Shadow, S); 6177 else 6178 CurContext->addDecl(Shadow); 6179 6180 6181 return Shadow; 6182} 6183 6184/// Hides a using shadow declaration. This is required by the current 6185/// using-decl implementation when a resolvable using declaration in a 6186/// class is followed by a declaration which would hide or override 6187/// one or more of the using decl's targets; for example: 6188/// 6189/// struct Base { void foo(int); }; 6190/// struct Derived : Base { 6191/// using Base::foo; 6192/// void foo(int); 6193/// }; 6194/// 6195/// The governing language is C++03 [namespace.udecl]p12: 6196/// 6197/// When a using-declaration brings names from a base class into a 6198/// derived class scope, member functions in the derived class 6199/// override and/or hide member functions with the same name and 6200/// parameter types in a base class (rather than conflicting). 6201/// 6202/// There are two ways to implement this: 6203/// (1) optimistically create shadow decls when they're not hidden 6204/// by existing declarations, or 6205/// (2) don't create any shadow decls (or at least don't make them 6206/// visible) until we've fully parsed/instantiated the class. 6207/// The problem with (1) is that we might have to retroactively remove 6208/// a shadow decl, which requires several O(n) operations because the 6209/// decl structures are (very reasonably) not designed for removal. 6210/// (2) avoids this but is very fiddly and phase-dependent. 6211void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6212 if (Shadow->getDeclName().getNameKind() == 6213 DeclarationName::CXXConversionFunctionName) 6214 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6215 6216 // Remove it from the DeclContext... 6217 Shadow->getDeclContext()->removeDecl(Shadow); 6218 6219 // ...and the scope, if applicable... 6220 if (S) { 6221 S->RemoveDecl(Shadow); 6222 IdResolver.RemoveDecl(Shadow); 6223 } 6224 6225 // ...and the using decl. 6226 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6227 6228 // TODO: complain somehow if Shadow was used. It shouldn't 6229 // be possible for this to happen, because...? 6230} 6231 6232/// Builds a using declaration. 6233/// 6234/// \param IsInstantiation - Whether this call arises from an 6235/// instantiation of an unresolved using declaration. We treat 6236/// the lookup differently for these declarations. 6237NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6238 SourceLocation UsingLoc, 6239 CXXScopeSpec &SS, 6240 const DeclarationNameInfo &NameInfo, 6241 AttributeList *AttrList, 6242 bool IsInstantiation, 6243 bool IsTypeName, 6244 SourceLocation TypenameLoc) { 6245 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6246 SourceLocation IdentLoc = NameInfo.getLoc(); 6247 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6248 6249 // FIXME: We ignore attributes for now. 6250 6251 if (SS.isEmpty()) { 6252 Diag(IdentLoc, diag::err_using_requires_qualname); 6253 return 0; 6254 } 6255 6256 // Do the redeclaration lookup in the current scope. 6257 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6258 ForRedeclaration); 6259 Previous.setHideTags(false); 6260 if (S) { 6261 LookupName(Previous, S); 6262 6263 // It is really dumb that we have to do this. 6264 LookupResult::Filter F = Previous.makeFilter(); 6265 while (F.hasNext()) { 6266 NamedDecl *D = F.next(); 6267 if (!isDeclInScope(D, CurContext, S)) 6268 F.erase(); 6269 } 6270 F.done(); 6271 } else { 6272 assert(IsInstantiation && "no scope in non-instantiation"); 6273 assert(CurContext->isRecord() && "scope not record in instantiation"); 6274 LookupQualifiedName(Previous, CurContext); 6275 } 6276 6277 // Check for invalid redeclarations. 6278 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6279 return 0; 6280 6281 // Check for bad qualifiers. 6282 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6283 return 0; 6284 6285 DeclContext *LookupContext = computeDeclContext(SS); 6286 NamedDecl *D; 6287 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6288 if (!LookupContext) { 6289 if (IsTypeName) { 6290 // FIXME: not all declaration name kinds are legal here 6291 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6292 UsingLoc, TypenameLoc, 6293 QualifierLoc, 6294 IdentLoc, NameInfo.getName()); 6295 } else { 6296 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6297 QualifierLoc, NameInfo); 6298 } 6299 } else { 6300 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6301 NameInfo, IsTypeName); 6302 } 6303 D->setAccess(AS); 6304 CurContext->addDecl(D); 6305 6306 if (!LookupContext) return D; 6307 UsingDecl *UD = cast<UsingDecl>(D); 6308 6309 if (RequireCompleteDeclContext(SS, LookupContext)) { 6310 UD->setInvalidDecl(); 6311 return UD; 6312 } 6313 6314 // The normal rules do not apply to inheriting constructor declarations. 6315 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6316 if (CheckInheritingConstructorUsingDecl(UD)) 6317 UD->setInvalidDecl(); 6318 return UD; 6319 } 6320 6321 // Otherwise, look up the target name. 6322 6323 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6324 6325 // Unlike most lookups, we don't always want to hide tag 6326 // declarations: tag names are visible through the using declaration 6327 // even if hidden by ordinary names, *except* in a dependent context 6328 // where it's important for the sanity of two-phase lookup. 6329 if (!IsInstantiation) 6330 R.setHideTags(false); 6331 6332 // For the purposes of this lookup, we have a base object type 6333 // equal to that of the current context. 6334 if (CurContext->isRecord()) { 6335 R.setBaseObjectType( 6336 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6337 } 6338 6339 LookupQualifiedName(R, LookupContext); 6340 6341 if (R.empty()) { 6342 Diag(IdentLoc, diag::err_no_member) 6343 << NameInfo.getName() << LookupContext << SS.getRange(); 6344 UD->setInvalidDecl(); 6345 return UD; 6346 } 6347 6348 if (R.isAmbiguous()) { 6349 UD->setInvalidDecl(); 6350 return UD; 6351 } 6352 6353 if (IsTypeName) { 6354 // If we asked for a typename and got a non-type decl, error out. 6355 if (!R.getAsSingle<TypeDecl>()) { 6356 Diag(IdentLoc, diag::err_using_typename_non_type); 6357 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6358 Diag((*I)->getUnderlyingDecl()->getLocation(), 6359 diag::note_using_decl_target); 6360 UD->setInvalidDecl(); 6361 return UD; 6362 } 6363 } else { 6364 // If we asked for a non-typename and we got a type, error out, 6365 // but only if this is an instantiation of an unresolved using 6366 // decl. Otherwise just silently find the type name. 6367 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6368 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6369 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6370 UD->setInvalidDecl(); 6371 return UD; 6372 } 6373 } 6374 6375 // C++0x N2914 [namespace.udecl]p6: 6376 // A using-declaration shall not name a namespace. 6377 if (R.getAsSingle<NamespaceDecl>()) { 6378 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6379 << SS.getRange(); 6380 UD->setInvalidDecl(); 6381 return UD; 6382 } 6383 6384 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6385 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6386 BuildUsingShadowDecl(S, UD, *I); 6387 } 6388 6389 return UD; 6390} 6391 6392/// Additional checks for a using declaration referring to a constructor name. 6393bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6394 assert(!UD->isTypeName() && "expecting a constructor name"); 6395 6396 const Type *SourceType = UD->getQualifier()->getAsType(); 6397 assert(SourceType && 6398 "Using decl naming constructor doesn't have type in scope spec."); 6399 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6400 6401 // Check whether the named type is a direct base class. 6402 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6403 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6404 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6405 BaseIt != BaseE; ++BaseIt) { 6406 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6407 if (CanonicalSourceType == BaseType) 6408 break; 6409 if (BaseIt->getType()->isDependentType()) 6410 break; 6411 } 6412 6413 if (BaseIt == BaseE) { 6414 // Did not find SourceType in the bases. 6415 Diag(UD->getUsingLocation(), 6416 diag::err_using_decl_constructor_not_in_direct_base) 6417 << UD->getNameInfo().getSourceRange() 6418 << QualType(SourceType, 0) << TargetClass; 6419 return true; 6420 } 6421 6422 if (!CurContext->isDependentContext()) 6423 BaseIt->setInheritConstructors(); 6424 6425 return false; 6426} 6427 6428/// Checks that the given using declaration is not an invalid 6429/// redeclaration. Note that this is checking only for the using decl 6430/// itself, not for any ill-formedness among the UsingShadowDecls. 6431bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6432 bool isTypeName, 6433 const CXXScopeSpec &SS, 6434 SourceLocation NameLoc, 6435 const LookupResult &Prev) { 6436 // C++03 [namespace.udecl]p8: 6437 // C++0x [namespace.udecl]p10: 6438 // A using-declaration is a declaration and can therefore be used 6439 // repeatedly where (and only where) multiple declarations are 6440 // allowed. 6441 // 6442 // That's in non-member contexts. 6443 if (!CurContext->getRedeclContext()->isRecord()) 6444 return false; 6445 6446 NestedNameSpecifier *Qual 6447 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6448 6449 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6450 NamedDecl *D = *I; 6451 6452 bool DTypename; 6453 NestedNameSpecifier *DQual; 6454 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6455 DTypename = UD->isTypeName(); 6456 DQual = UD->getQualifier(); 6457 } else if (UnresolvedUsingValueDecl *UD 6458 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6459 DTypename = false; 6460 DQual = UD->getQualifier(); 6461 } else if (UnresolvedUsingTypenameDecl *UD 6462 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6463 DTypename = true; 6464 DQual = UD->getQualifier(); 6465 } else continue; 6466 6467 // using decls differ if one says 'typename' and the other doesn't. 6468 // FIXME: non-dependent using decls? 6469 if (isTypeName != DTypename) continue; 6470 6471 // using decls differ if they name different scopes (but note that 6472 // template instantiation can cause this check to trigger when it 6473 // didn't before instantiation). 6474 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6475 Context.getCanonicalNestedNameSpecifier(DQual)) 6476 continue; 6477 6478 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6479 Diag(D->getLocation(), diag::note_using_decl) << 1; 6480 return true; 6481 } 6482 6483 return false; 6484} 6485 6486 6487/// Checks that the given nested-name qualifier used in a using decl 6488/// in the current context is appropriately related to the current 6489/// scope. If an error is found, diagnoses it and returns true. 6490bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6491 const CXXScopeSpec &SS, 6492 SourceLocation NameLoc) { 6493 DeclContext *NamedContext = computeDeclContext(SS); 6494 6495 if (!CurContext->isRecord()) { 6496 // C++03 [namespace.udecl]p3: 6497 // C++0x [namespace.udecl]p8: 6498 // A using-declaration for a class member shall be a member-declaration. 6499 6500 // If we weren't able to compute a valid scope, it must be a 6501 // dependent class scope. 6502 if (!NamedContext || NamedContext->isRecord()) { 6503 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6504 << SS.getRange(); 6505 return true; 6506 } 6507 6508 // Otherwise, everything is known to be fine. 6509 return false; 6510 } 6511 6512 // The current scope is a record. 6513 6514 // If the named context is dependent, we can't decide much. 6515 if (!NamedContext) { 6516 // FIXME: in C++0x, we can diagnose if we can prove that the 6517 // nested-name-specifier does not refer to a base class, which is 6518 // still possible in some cases. 6519 6520 // Otherwise we have to conservatively report that things might be 6521 // okay. 6522 return false; 6523 } 6524 6525 if (!NamedContext->isRecord()) { 6526 // Ideally this would point at the last name in the specifier, 6527 // but we don't have that level of source info. 6528 Diag(SS.getRange().getBegin(), 6529 diag::err_using_decl_nested_name_specifier_is_not_class) 6530 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6531 return true; 6532 } 6533 6534 if (!NamedContext->isDependentContext() && 6535 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6536 return true; 6537 6538 if (getLangOpts().CPlusPlus0x) { 6539 // C++0x [namespace.udecl]p3: 6540 // In a using-declaration used as a member-declaration, the 6541 // nested-name-specifier shall name a base class of the class 6542 // being defined. 6543 6544 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6545 cast<CXXRecordDecl>(NamedContext))) { 6546 if (CurContext == NamedContext) { 6547 Diag(NameLoc, 6548 diag::err_using_decl_nested_name_specifier_is_current_class) 6549 << SS.getRange(); 6550 return true; 6551 } 6552 6553 Diag(SS.getRange().getBegin(), 6554 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6555 << (NestedNameSpecifier*) SS.getScopeRep() 6556 << cast<CXXRecordDecl>(CurContext) 6557 << SS.getRange(); 6558 return true; 6559 } 6560 6561 return false; 6562 } 6563 6564 // C++03 [namespace.udecl]p4: 6565 // A using-declaration used as a member-declaration shall refer 6566 // to a member of a base class of the class being defined [etc.]. 6567 6568 // Salient point: SS doesn't have to name a base class as long as 6569 // lookup only finds members from base classes. Therefore we can 6570 // diagnose here only if we can prove that that can't happen, 6571 // i.e. if the class hierarchies provably don't intersect. 6572 6573 // TODO: it would be nice if "definitely valid" results were cached 6574 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6575 // need to be repeated. 6576 6577 struct UserData { 6578 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 6579 6580 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6581 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6582 Data->Bases.insert(Base); 6583 return true; 6584 } 6585 6586 bool hasDependentBases(const CXXRecordDecl *Class) { 6587 return !Class->forallBases(collect, this); 6588 } 6589 6590 /// Returns true if the base is dependent or is one of the 6591 /// accumulated base classes. 6592 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6593 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6594 return !Data->Bases.count(Base); 6595 } 6596 6597 bool mightShareBases(const CXXRecordDecl *Class) { 6598 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6599 } 6600 }; 6601 6602 UserData Data; 6603 6604 // Returns false if we find a dependent base. 6605 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6606 return false; 6607 6608 // Returns false if the class has a dependent base or if it or one 6609 // of its bases is present in the base set of the current context. 6610 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6611 return false; 6612 6613 Diag(SS.getRange().getBegin(), 6614 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6615 << (NestedNameSpecifier*) SS.getScopeRep() 6616 << cast<CXXRecordDecl>(CurContext) 6617 << SS.getRange(); 6618 6619 return true; 6620} 6621 6622Decl *Sema::ActOnAliasDeclaration(Scope *S, 6623 AccessSpecifier AS, 6624 MultiTemplateParamsArg TemplateParamLists, 6625 SourceLocation UsingLoc, 6626 UnqualifiedId &Name, 6627 TypeResult Type) { 6628 // Skip up to the relevant declaration scope. 6629 while (S->getFlags() & Scope::TemplateParamScope) 6630 S = S->getParent(); 6631 assert((S->getFlags() & Scope::DeclScope) && 6632 "got alias-declaration outside of declaration scope"); 6633 6634 if (Type.isInvalid()) 6635 return 0; 6636 6637 bool Invalid = false; 6638 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6639 TypeSourceInfo *TInfo = 0; 6640 GetTypeFromParser(Type.get(), &TInfo); 6641 6642 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6643 return 0; 6644 6645 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6646 UPPC_DeclarationType)) { 6647 Invalid = true; 6648 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6649 TInfo->getTypeLoc().getBeginLoc()); 6650 } 6651 6652 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6653 LookupName(Previous, S); 6654 6655 // Warn about shadowing the name of a template parameter. 6656 if (Previous.isSingleResult() && 6657 Previous.getFoundDecl()->isTemplateParameter()) { 6658 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6659 Previous.clear(); 6660 } 6661 6662 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6663 "name in alias declaration must be an identifier"); 6664 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6665 Name.StartLocation, 6666 Name.Identifier, TInfo); 6667 6668 NewTD->setAccess(AS); 6669 6670 if (Invalid) 6671 NewTD->setInvalidDecl(); 6672 6673 CheckTypedefForVariablyModifiedType(S, NewTD); 6674 Invalid |= NewTD->isInvalidDecl(); 6675 6676 bool Redeclaration = false; 6677 6678 NamedDecl *NewND; 6679 if (TemplateParamLists.size()) { 6680 TypeAliasTemplateDecl *OldDecl = 0; 6681 TemplateParameterList *OldTemplateParams = 0; 6682 6683 if (TemplateParamLists.size() != 1) { 6684 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6685 << SourceRange(TemplateParamLists[1]->getTemplateLoc(), 6686 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); 6687 } 6688 TemplateParameterList *TemplateParams = TemplateParamLists[0]; 6689 6690 // Only consider previous declarations in the same scope. 6691 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6692 /*ExplicitInstantiationOrSpecialization*/false); 6693 if (!Previous.empty()) { 6694 Redeclaration = true; 6695 6696 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6697 if (!OldDecl && !Invalid) { 6698 Diag(UsingLoc, diag::err_redefinition_different_kind) 6699 << Name.Identifier; 6700 6701 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6702 if (OldD->getLocation().isValid()) 6703 Diag(OldD->getLocation(), diag::note_previous_definition); 6704 6705 Invalid = true; 6706 } 6707 6708 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6709 if (TemplateParameterListsAreEqual(TemplateParams, 6710 OldDecl->getTemplateParameters(), 6711 /*Complain=*/true, 6712 TPL_TemplateMatch)) 6713 OldTemplateParams = OldDecl->getTemplateParameters(); 6714 else 6715 Invalid = true; 6716 6717 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6718 if (!Invalid && 6719 !Context.hasSameType(OldTD->getUnderlyingType(), 6720 NewTD->getUnderlyingType())) { 6721 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6722 // but we can't reasonably accept it. 6723 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6724 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6725 if (OldTD->getLocation().isValid()) 6726 Diag(OldTD->getLocation(), diag::note_previous_definition); 6727 Invalid = true; 6728 } 6729 } 6730 } 6731 6732 // Merge any previous default template arguments into our parameters, 6733 // and check the parameter list. 6734 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6735 TPC_TypeAliasTemplate)) 6736 return 0; 6737 6738 TypeAliasTemplateDecl *NewDecl = 6739 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6740 Name.Identifier, TemplateParams, 6741 NewTD); 6742 6743 NewDecl->setAccess(AS); 6744 6745 if (Invalid) 6746 NewDecl->setInvalidDecl(); 6747 else if (OldDecl) 6748 NewDecl->setPreviousDeclaration(OldDecl); 6749 6750 NewND = NewDecl; 6751 } else { 6752 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6753 NewND = NewTD; 6754 } 6755 6756 if (!Redeclaration) 6757 PushOnScopeChains(NewND, S); 6758 6759 ActOnDocumentableDecl(NewND); 6760 return NewND; 6761} 6762 6763Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6764 SourceLocation NamespaceLoc, 6765 SourceLocation AliasLoc, 6766 IdentifierInfo *Alias, 6767 CXXScopeSpec &SS, 6768 SourceLocation IdentLoc, 6769 IdentifierInfo *Ident) { 6770 6771 // Lookup the namespace name. 6772 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6773 LookupParsedName(R, S, &SS); 6774 6775 // Check if we have a previous declaration with the same name. 6776 NamedDecl *PrevDecl 6777 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6778 ForRedeclaration); 6779 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6780 PrevDecl = 0; 6781 6782 if (PrevDecl) { 6783 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6784 // We already have an alias with the same name that points to the same 6785 // namespace, so don't create a new one. 6786 // FIXME: At some point, we'll want to create the (redundant) 6787 // declaration to maintain better source information. 6788 if (!R.isAmbiguous() && !R.empty() && 6789 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6790 return 0; 6791 } 6792 6793 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6794 diag::err_redefinition_different_kind; 6795 Diag(AliasLoc, DiagID) << Alias; 6796 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6797 return 0; 6798 } 6799 6800 if (R.isAmbiguous()) 6801 return 0; 6802 6803 if (R.empty()) { 6804 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6805 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6806 return 0; 6807 } 6808 } 6809 6810 NamespaceAliasDecl *AliasDecl = 6811 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6812 Alias, SS.getWithLocInContext(Context), 6813 IdentLoc, R.getFoundDecl()); 6814 6815 PushOnScopeChains(AliasDecl, S); 6816 return AliasDecl; 6817} 6818 6819namespace { 6820 /// \brief Scoped object used to handle the state changes required in Sema 6821 /// to implicitly define the body of a C++ member function; 6822 class ImplicitlyDefinedFunctionScope { 6823 Sema &S; 6824 Sema::ContextRAII SavedContext; 6825 6826 public: 6827 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6828 : S(S), SavedContext(S, Method) 6829 { 6830 S.PushFunctionScope(); 6831 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6832 } 6833 6834 ~ImplicitlyDefinedFunctionScope() { 6835 S.PopExpressionEvaluationContext(); 6836 S.PopFunctionScopeInfo(); 6837 } 6838 }; 6839} 6840 6841Sema::ImplicitExceptionSpecification 6842Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 6843 CXXMethodDecl *MD) { 6844 CXXRecordDecl *ClassDecl = MD->getParent(); 6845 6846 // C++ [except.spec]p14: 6847 // An implicitly declared special member function (Clause 12) shall have an 6848 // exception-specification. [...] 6849 ImplicitExceptionSpecification ExceptSpec(*this); 6850 if (ClassDecl->isInvalidDecl()) 6851 return ExceptSpec; 6852 6853 // Direct base-class constructors. 6854 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6855 BEnd = ClassDecl->bases_end(); 6856 B != BEnd; ++B) { 6857 if (B->isVirtual()) // Handled below. 6858 continue; 6859 6860 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6861 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6862 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6863 // If this is a deleted function, add it anyway. This might be conformant 6864 // with the standard. This might not. I'm not sure. It might not matter. 6865 if (Constructor) 6866 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6867 } 6868 } 6869 6870 // Virtual base-class constructors. 6871 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6872 BEnd = ClassDecl->vbases_end(); 6873 B != BEnd; ++B) { 6874 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6875 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6876 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6877 // If this is a deleted function, add it anyway. This might be conformant 6878 // with the standard. This might not. I'm not sure. It might not matter. 6879 if (Constructor) 6880 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6881 } 6882 } 6883 6884 // Field constructors. 6885 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6886 FEnd = ClassDecl->field_end(); 6887 F != FEnd; ++F) { 6888 if (F->hasInClassInitializer()) { 6889 if (Expr *E = F->getInClassInitializer()) 6890 ExceptSpec.CalledExpr(E); 6891 else if (!F->isInvalidDecl()) 6892 // DR1351: 6893 // If the brace-or-equal-initializer of a non-static data member 6894 // invokes a defaulted default constructor of its class or of an 6895 // enclosing class in a potentially evaluated subexpression, the 6896 // program is ill-formed. 6897 // 6898 // This resolution is unworkable: the exception specification of the 6899 // default constructor can be needed in an unevaluated context, in 6900 // particular, in the operand of a noexcept-expression, and we can be 6901 // unable to compute an exception specification for an enclosed class. 6902 // 6903 // We do not allow an in-class initializer to require the evaluation 6904 // of the exception specification for any in-class initializer whose 6905 // definition is not lexically complete. 6906 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 6907 } else if (const RecordType *RecordTy 6908 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6909 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6910 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6911 // If this is a deleted function, add it anyway. This might be conformant 6912 // with the standard. This might not. I'm not sure. It might not matter. 6913 // In particular, the problem is that this function never gets called. It 6914 // might just be ill-formed because this function attempts to refer to 6915 // a deleted function here. 6916 if (Constructor) 6917 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 6918 } 6919 } 6920 6921 return ExceptSpec; 6922} 6923 6924CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6925 CXXRecordDecl *ClassDecl) { 6926 // C++ [class.ctor]p5: 6927 // A default constructor for a class X is a constructor of class X 6928 // that can be called without an argument. If there is no 6929 // user-declared constructor for class X, a default constructor is 6930 // implicitly declared. An implicitly-declared default constructor 6931 // is an inline public member of its class. 6932 assert(!ClassDecl->hasUserDeclaredConstructor() && 6933 "Should not build implicit default constructor!"); 6934 6935 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 6936 CXXDefaultConstructor, 6937 false); 6938 6939 // Create the actual constructor declaration. 6940 CanQualType ClassType 6941 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6942 SourceLocation ClassLoc = ClassDecl->getLocation(); 6943 DeclarationName Name 6944 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6945 DeclarationNameInfo NameInfo(Name, ClassLoc); 6946 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6947 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 6948 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6949 Constexpr); 6950 DefaultCon->setAccess(AS_public); 6951 DefaultCon->setDefaulted(); 6952 DefaultCon->setImplicit(); 6953 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6954 6955 // Build an exception specification pointing back at this constructor. 6956 FunctionProtoType::ExtProtoInfo EPI; 6957 EPI.ExceptionSpecType = EST_Unevaluated; 6958 EPI.ExceptionSpecDecl = DefaultCon; 6959 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6960 6961 // Note that we have declared this constructor. 6962 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6963 6964 if (Scope *S = getScopeForContext(ClassDecl)) 6965 PushOnScopeChains(DefaultCon, S, false); 6966 ClassDecl->addDecl(DefaultCon); 6967 6968 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6969 DefaultCon->setDeletedAsWritten(); 6970 6971 return DefaultCon; 6972} 6973 6974void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6975 CXXConstructorDecl *Constructor) { 6976 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6977 !Constructor->doesThisDeclarationHaveABody() && 6978 !Constructor->isDeleted()) && 6979 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6980 6981 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6982 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6983 6984 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6985 DiagnosticErrorTrap Trap(Diags); 6986 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6987 Trap.hasErrorOccurred()) { 6988 Diag(CurrentLocation, diag::note_member_synthesized_at) 6989 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6990 Constructor->setInvalidDecl(); 6991 return; 6992 } 6993 6994 SourceLocation Loc = Constructor->getLocation(); 6995 Constructor->setBody(new (Context) CompoundStmt(Loc)); 6996 6997 Constructor->setUsed(); 6998 MarkVTableUsed(CurrentLocation, ClassDecl); 6999 7000 if (ASTMutationListener *L = getASTMutationListener()) { 7001 L->CompletedImplicitDefinition(Constructor); 7002 } 7003} 7004 7005void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 7006 if (!D) return; 7007 AdjustDeclIfTemplate(D); 7008 7009 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 7010 7011 if (!ClassDecl->isDependentType()) 7012 CheckExplicitlyDefaultedMethods(ClassDecl); 7013} 7014 7015void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 7016 // We start with an initial pass over the base classes to collect those that 7017 // inherit constructors from. If there are none, we can forgo all further 7018 // processing. 7019 typedef SmallVector<const RecordType *, 4> BasesVector; 7020 BasesVector BasesToInheritFrom; 7021 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 7022 BaseE = ClassDecl->bases_end(); 7023 BaseIt != BaseE; ++BaseIt) { 7024 if (BaseIt->getInheritConstructors()) { 7025 QualType Base = BaseIt->getType(); 7026 if (Base->isDependentType()) { 7027 // If we inherit constructors from anything that is dependent, just 7028 // abort processing altogether. We'll get another chance for the 7029 // instantiations. 7030 return; 7031 } 7032 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 7033 } 7034 } 7035 if (BasesToInheritFrom.empty()) 7036 return; 7037 7038 // Now collect the constructors that we already have in the current class. 7039 // Those take precedence over inherited constructors. 7040 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7041 // unless there is a user-declared constructor with the same signature in 7042 // the class where the using-declaration appears. 7043 llvm::SmallSet<const Type *, 8> ExistingConstructors; 7044 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 7045 CtorE = ClassDecl->ctor_end(); 7046 CtorIt != CtorE; ++CtorIt) { 7047 ExistingConstructors.insert( 7048 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 7049 } 7050 7051 DeclarationName CreatedCtorName = 7052 Context.DeclarationNames.getCXXConstructorName( 7053 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 7054 7055 // Now comes the true work. 7056 // First, we keep a map from constructor types to the base that introduced 7057 // them. Needed for finding conflicting constructors. We also keep the 7058 // actually inserted declarations in there, for pretty diagnostics. 7059 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 7060 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 7061 ConstructorToSourceMap InheritedConstructors; 7062 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 7063 BaseE = BasesToInheritFrom.end(); 7064 BaseIt != BaseE; ++BaseIt) { 7065 const RecordType *Base = *BaseIt; 7066 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 7067 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 7068 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 7069 CtorE = BaseDecl->ctor_end(); 7070 CtorIt != CtorE; ++CtorIt) { 7071 // Find the using declaration for inheriting this base's constructors. 7072 // FIXME: Don't perform name lookup just to obtain a source location! 7073 DeclarationName Name = 7074 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7075 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 7076 LookupQualifiedName(Result, CurContext); 7077 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 7078 SourceLocation UsingLoc = UD ? UD->getLocation() : 7079 ClassDecl->getLocation(); 7080 7081 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 7082 // from the class X named in the using-declaration consists of actual 7083 // constructors and notional constructors that result from the 7084 // transformation of defaulted parameters as follows: 7085 // - all non-template default constructors of X, and 7086 // - for each non-template constructor of X that has at least one 7087 // parameter with a default argument, the set of constructors that 7088 // results from omitting any ellipsis parameter specification and 7089 // successively omitting parameters with a default argument from the 7090 // end of the parameter-type-list. 7091 CXXConstructorDecl *BaseCtor = *CtorIt; 7092 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7093 const FunctionProtoType *BaseCtorType = 7094 BaseCtor->getType()->getAs<FunctionProtoType>(); 7095 7096 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7097 maxParams = BaseCtor->getNumParams(); 7098 params <= maxParams; ++params) { 7099 // Skip default constructors. They're never inherited. 7100 if (params == 0) 7101 continue; 7102 // Skip copy and move constructors for the same reason. 7103 if (CanBeCopyOrMove && params == 1) 7104 continue; 7105 7106 // Build up a function type for this particular constructor. 7107 // FIXME: The working paper does not consider that the exception spec 7108 // for the inheriting constructor might be larger than that of the 7109 // source. This code doesn't yet, either. When it does, this code will 7110 // need to be delayed until after exception specifications and in-class 7111 // member initializers are attached. 7112 const Type *NewCtorType; 7113 if (params == maxParams) 7114 NewCtorType = BaseCtorType; 7115 else { 7116 SmallVector<QualType, 16> Args; 7117 for (unsigned i = 0; i < params; ++i) { 7118 Args.push_back(BaseCtorType->getArgType(i)); 7119 } 7120 FunctionProtoType::ExtProtoInfo ExtInfo = 7121 BaseCtorType->getExtProtoInfo(); 7122 ExtInfo.Variadic = false; 7123 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7124 Args.data(), params, ExtInfo) 7125 .getTypePtr(); 7126 } 7127 const Type *CanonicalNewCtorType = 7128 Context.getCanonicalType(NewCtorType); 7129 7130 // Now that we have the type, first check if the class already has a 7131 // constructor with this signature. 7132 if (ExistingConstructors.count(CanonicalNewCtorType)) 7133 continue; 7134 7135 // Then we check if we have already declared an inherited constructor 7136 // with this signature. 7137 std::pair<ConstructorToSourceMap::iterator, bool> result = 7138 InheritedConstructors.insert(std::make_pair( 7139 CanonicalNewCtorType, 7140 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7141 if (!result.second) { 7142 // Already in the map. If it came from a different class, that's an 7143 // error. Not if it's from the same. 7144 CanQualType PreviousBase = result.first->second.first; 7145 if (CanonicalBase != PreviousBase) { 7146 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7147 const CXXConstructorDecl *PrevBaseCtor = 7148 PrevCtor->getInheritedConstructor(); 7149 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7150 7151 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7152 Diag(BaseCtor->getLocation(), 7153 diag::note_using_decl_constructor_conflict_current_ctor); 7154 Diag(PrevBaseCtor->getLocation(), 7155 diag::note_using_decl_constructor_conflict_previous_ctor); 7156 Diag(PrevCtor->getLocation(), 7157 diag::note_using_decl_constructor_conflict_previous_using); 7158 } 7159 continue; 7160 } 7161 7162 // OK, we're there, now add the constructor. 7163 // C++0x [class.inhctor]p8: [...] that would be performed by a 7164 // user-written inline constructor [...] 7165 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7166 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7167 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7168 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7169 /*ImplicitlyDeclared=*/true, 7170 // FIXME: Due to a defect in the standard, we treat inherited 7171 // constructors as constexpr even if that makes them ill-formed. 7172 /*Constexpr=*/BaseCtor->isConstexpr()); 7173 NewCtor->setAccess(BaseCtor->getAccess()); 7174 7175 // Build up the parameter decls and add them. 7176 SmallVector<ParmVarDecl *, 16> ParamDecls; 7177 for (unsigned i = 0; i < params; ++i) { 7178 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7179 UsingLoc, UsingLoc, 7180 /*IdentifierInfo=*/0, 7181 BaseCtorType->getArgType(i), 7182 /*TInfo=*/0, SC_None, 7183 SC_None, /*DefaultArg=*/0)); 7184 } 7185 NewCtor->setParams(ParamDecls); 7186 NewCtor->setInheritedConstructor(BaseCtor); 7187 7188 ClassDecl->addDecl(NewCtor); 7189 result.first->second.second = NewCtor; 7190 } 7191 } 7192 } 7193} 7194 7195Sema::ImplicitExceptionSpecification 7196Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 7197 CXXRecordDecl *ClassDecl = MD->getParent(); 7198 7199 // C++ [except.spec]p14: 7200 // An implicitly declared special member function (Clause 12) shall have 7201 // an exception-specification. 7202 ImplicitExceptionSpecification ExceptSpec(*this); 7203 if (ClassDecl->isInvalidDecl()) 7204 return ExceptSpec; 7205 7206 // Direct base-class destructors. 7207 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7208 BEnd = ClassDecl->bases_end(); 7209 B != BEnd; ++B) { 7210 if (B->isVirtual()) // Handled below. 7211 continue; 7212 7213 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7214 ExceptSpec.CalledDecl(B->getLocStart(), 7215 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7216 } 7217 7218 // Virtual base-class destructors. 7219 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7220 BEnd = ClassDecl->vbases_end(); 7221 B != BEnd; ++B) { 7222 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7223 ExceptSpec.CalledDecl(B->getLocStart(), 7224 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7225 } 7226 7227 // Field destructors. 7228 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7229 FEnd = ClassDecl->field_end(); 7230 F != FEnd; ++F) { 7231 if (const RecordType *RecordTy 7232 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7233 ExceptSpec.CalledDecl(F->getLocation(), 7234 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7235 } 7236 7237 return ExceptSpec; 7238} 7239 7240CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7241 // C++ [class.dtor]p2: 7242 // If a class has no user-declared destructor, a destructor is 7243 // declared implicitly. An implicitly-declared destructor is an 7244 // inline public member of its class. 7245 7246 // Create the actual destructor declaration. 7247 CanQualType ClassType 7248 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7249 SourceLocation ClassLoc = ClassDecl->getLocation(); 7250 DeclarationName Name 7251 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7252 DeclarationNameInfo NameInfo(Name, ClassLoc); 7253 CXXDestructorDecl *Destructor 7254 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7255 QualType(), 0, /*isInline=*/true, 7256 /*isImplicitlyDeclared=*/true); 7257 Destructor->setAccess(AS_public); 7258 Destructor->setDefaulted(); 7259 Destructor->setImplicit(); 7260 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7261 7262 // Build an exception specification pointing back at this destructor. 7263 FunctionProtoType::ExtProtoInfo EPI; 7264 EPI.ExceptionSpecType = EST_Unevaluated; 7265 EPI.ExceptionSpecDecl = Destructor; 7266 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7267 7268 // Note that we have declared this destructor. 7269 ++ASTContext::NumImplicitDestructorsDeclared; 7270 7271 // Introduce this destructor into its scope. 7272 if (Scope *S = getScopeForContext(ClassDecl)) 7273 PushOnScopeChains(Destructor, S, false); 7274 ClassDecl->addDecl(Destructor); 7275 7276 AddOverriddenMethods(ClassDecl, Destructor); 7277 7278 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7279 Destructor->setDeletedAsWritten(); 7280 7281 return Destructor; 7282} 7283 7284void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7285 CXXDestructorDecl *Destructor) { 7286 assert((Destructor->isDefaulted() && 7287 !Destructor->doesThisDeclarationHaveABody() && 7288 !Destructor->isDeleted()) && 7289 "DefineImplicitDestructor - call it for implicit default dtor"); 7290 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7291 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7292 7293 if (Destructor->isInvalidDecl()) 7294 return; 7295 7296 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7297 7298 DiagnosticErrorTrap Trap(Diags); 7299 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7300 Destructor->getParent()); 7301 7302 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7303 Diag(CurrentLocation, diag::note_member_synthesized_at) 7304 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7305 7306 Destructor->setInvalidDecl(); 7307 return; 7308 } 7309 7310 SourceLocation Loc = Destructor->getLocation(); 7311 Destructor->setBody(new (Context) CompoundStmt(Loc)); 7312 Destructor->setImplicitlyDefined(true); 7313 Destructor->setUsed(); 7314 MarkVTableUsed(CurrentLocation, ClassDecl); 7315 7316 if (ASTMutationListener *L = getASTMutationListener()) { 7317 L->CompletedImplicitDefinition(Destructor); 7318 } 7319} 7320 7321/// \brief Perform any semantic analysis which needs to be delayed until all 7322/// pending class member declarations have been parsed. 7323void Sema::ActOnFinishCXXMemberDecls() { 7324 // Perform any deferred checking of exception specifications for virtual 7325 // destructors. 7326 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 7327 i != e; ++i) { 7328 const CXXDestructorDecl *Dtor = 7329 DelayedDestructorExceptionSpecChecks[i].first; 7330 assert(!Dtor->getParent()->isDependentType() && 7331 "Should not ever add destructors of templates into the list."); 7332 CheckOverridingFunctionExceptionSpec(Dtor, 7333 DelayedDestructorExceptionSpecChecks[i].second); 7334 } 7335 DelayedDestructorExceptionSpecChecks.clear(); 7336} 7337 7338void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 7339 CXXDestructorDecl *Destructor) { 7340 assert(getLangOpts().CPlusPlus0x && 7341 "adjusting dtor exception specs was introduced in c++11"); 7342 7343 // C++11 [class.dtor]p3: 7344 // A declaration of a destructor that does not have an exception- 7345 // specification is implicitly considered to have the same exception- 7346 // specification as an implicit declaration. 7347 const FunctionProtoType *DtorType = Destructor->getType()-> 7348 getAs<FunctionProtoType>(); 7349 if (DtorType->hasExceptionSpec()) 7350 return; 7351 7352 // Replace the destructor's type, building off the existing one. Fortunately, 7353 // the only thing of interest in the destructor type is its extended info. 7354 // The return and arguments are fixed. 7355 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 7356 EPI.ExceptionSpecType = EST_Unevaluated; 7357 EPI.ExceptionSpecDecl = Destructor; 7358 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7359 7360 // FIXME: If the destructor has a body that could throw, and the newly created 7361 // spec doesn't allow exceptions, we should emit a warning, because this 7362 // change in behavior can break conforming C++03 programs at runtime. 7363 // However, we don't have a body or an exception specification yet, so it 7364 // needs to be done somewhere else. 7365} 7366 7367/// \brief Builds a statement that copies/moves the given entity from \p From to 7368/// \c To. 7369/// 7370/// This routine is used to copy/move the members of a class with an 7371/// implicitly-declared copy/move assignment operator. When the entities being 7372/// copied are arrays, this routine builds for loops to copy them. 7373/// 7374/// \param S The Sema object used for type-checking. 7375/// 7376/// \param Loc The location where the implicit copy/move is being generated. 7377/// 7378/// \param T The type of the expressions being copied/moved. Both expressions 7379/// must have this type. 7380/// 7381/// \param To The expression we are copying/moving to. 7382/// 7383/// \param From The expression we are copying/moving from. 7384/// 7385/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7386/// Otherwise, it's a non-static member subobject. 7387/// 7388/// \param Copying Whether we're copying or moving. 7389/// 7390/// \param Depth Internal parameter recording the depth of the recursion. 7391/// 7392/// \returns A statement or a loop that copies the expressions. 7393static StmtResult 7394BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7395 Expr *To, Expr *From, 7396 bool CopyingBaseSubobject, bool Copying, 7397 unsigned Depth = 0) { 7398 // C++0x [class.copy]p28: 7399 // Each subobject is assigned in the manner appropriate to its type: 7400 // 7401 // - if the subobject is of class type, as if by a call to operator= with 7402 // the subobject as the object expression and the corresponding 7403 // subobject of x as a single function argument (as if by explicit 7404 // qualification; that is, ignoring any possible virtual overriding 7405 // functions in more derived classes); 7406 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7407 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7408 7409 // Look for operator=. 7410 DeclarationName Name 7411 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7412 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7413 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7414 7415 // Filter out any result that isn't a copy/move-assignment operator. 7416 LookupResult::Filter F = OpLookup.makeFilter(); 7417 while (F.hasNext()) { 7418 NamedDecl *D = F.next(); 7419 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7420 if (Method->isCopyAssignmentOperator() || 7421 (!Copying && Method->isMoveAssignmentOperator())) 7422 continue; 7423 7424 F.erase(); 7425 } 7426 F.done(); 7427 7428 // Suppress the protected check (C++ [class.protected]) for each of the 7429 // assignment operators we found. This strange dance is required when 7430 // we're assigning via a base classes's copy-assignment operator. To 7431 // ensure that we're getting the right base class subobject (without 7432 // ambiguities), we need to cast "this" to that subobject type; to 7433 // ensure that we don't go through the virtual call mechanism, we need 7434 // to qualify the operator= name with the base class (see below). However, 7435 // this means that if the base class has a protected copy assignment 7436 // operator, the protected member access check will fail. So, we 7437 // rewrite "protected" access to "public" access in this case, since we 7438 // know by construction that we're calling from a derived class. 7439 if (CopyingBaseSubobject) { 7440 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7441 L != LEnd; ++L) { 7442 if (L.getAccess() == AS_protected) 7443 L.setAccess(AS_public); 7444 } 7445 } 7446 7447 // Create the nested-name-specifier that will be used to qualify the 7448 // reference to operator=; this is required to suppress the virtual 7449 // call mechanism. 7450 CXXScopeSpec SS; 7451 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7452 SS.MakeTrivial(S.Context, 7453 NestedNameSpecifier::Create(S.Context, 0, false, 7454 CanonicalT), 7455 Loc); 7456 7457 // Create the reference to operator=. 7458 ExprResult OpEqualRef 7459 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7460 /*TemplateKWLoc=*/SourceLocation(), 7461 /*FirstQualifierInScope=*/0, 7462 OpLookup, 7463 /*TemplateArgs=*/0, 7464 /*SuppressQualifierCheck=*/true); 7465 if (OpEqualRef.isInvalid()) 7466 return StmtError(); 7467 7468 // Build the call to the assignment operator. 7469 7470 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7471 OpEqualRef.takeAs<Expr>(), 7472 Loc, &From, 1, Loc); 7473 if (Call.isInvalid()) 7474 return StmtError(); 7475 7476 return S.Owned(Call.takeAs<Stmt>()); 7477 } 7478 7479 // - if the subobject is of scalar type, the built-in assignment 7480 // operator is used. 7481 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7482 if (!ArrayTy) { 7483 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7484 if (Assignment.isInvalid()) 7485 return StmtError(); 7486 7487 return S.Owned(Assignment.takeAs<Stmt>()); 7488 } 7489 7490 // - if the subobject is an array, each element is assigned, in the 7491 // manner appropriate to the element type; 7492 7493 // Construct a loop over the array bounds, e.g., 7494 // 7495 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7496 // 7497 // that will copy each of the array elements. 7498 QualType SizeType = S.Context.getSizeType(); 7499 7500 // Create the iteration variable. 7501 IdentifierInfo *IterationVarName = 0; 7502 { 7503 SmallString<8> Str; 7504 llvm::raw_svector_ostream OS(Str); 7505 OS << "__i" << Depth; 7506 IterationVarName = &S.Context.Idents.get(OS.str()); 7507 } 7508 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7509 IterationVarName, SizeType, 7510 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7511 SC_None, SC_None); 7512 7513 // Initialize the iteration variable to zero. 7514 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7515 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7516 7517 // Create a reference to the iteration variable; we'll use this several 7518 // times throughout. 7519 Expr *IterationVarRef 7520 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7521 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7522 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7523 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7524 7525 // Create the DeclStmt that holds the iteration variable. 7526 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7527 7528 // Create the comparison against the array bound. 7529 llvm::APInt Upper 7530 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7531 Expr *Comparison 7532 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7533 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7534 BO_NE, S.Context.BoolTy, 7535 VK_RValue, OK_Ordinary, Loc, false); 7536 7537 // Create the pre-increment of the iteration variable. 7538 Expr *Increment 7539 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7540 VK_LValue, OK_Ordinary, Loc); 7541 7542 // Subscript the "from" and "to" expressions with the iteration variable. 7543 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7544 IterationVarRefRVal, 7545 Loc)); 7546 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7547 IterationVarRefRVal, 7548 Loc)); 7549 if (!Copying) // Cast to rvalue 7550 From = CastForMoving(S, From); 7551 7552 // Build the copy/move for an individual element of the array. 7553 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7554 To, From, CopyingBaseSubobject, 7555 Copying, Depth + 1); 7556 if (Copy.isInvalid()) 7557 return StmtError(); 7558 7559 // Construct the loop that copies all elements of this array. 7560 return S.ActOnForStmt(Loc, Loc, InitStmt, 7561 S.MakeFullExpr(Comparison), 7562 0, S.MakeFullExpr(Increment), 7563 Loc, Copy.take()); 7564} 7565 7566/// Determine whether an implicit copy assignment operator for ClassDecl has a 7567/// const argument. 7568/// FIXME: It ought to be possible to store this on the record. 7569static bool isImplicitCopyAssignmentArgConst(Sema &S, 7570 CXXRecordDecl *ClassDecl) { 7571 if (ClassDecl->isInvalidDecl()) 7572 return true; 7573 7574 // C++ [class.copy]p10: 7575 // If the class definition does not explicitly declare a copy 7576 // assignment operator, one is declared implicitly. 7577 // The implicitly-defined copy assignment operator for a class X 7578 // will have the form 7579 // 7580 // X& X::operator=(const X&) 7581 // 7582 // if 7583 // -- each direct base class B of X has a copy assignment operator 7584 // whose parameter is of type const B&, const volatile B& or B, 7585 // and 7586 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7587 BaseEnd = ClassDecl->bases_end(); 7588 Base != BaseEnd; ++Base) { 7589 // We'll handle this below 7590 if (S.getLangOpts().CPlusPlus0x && Base->isVirtual()) 7591 continue; 7592 7593 assert(!Base->getType()->isDependentType() && 7594 "Cannot generate implicit members for class with dependent bases."); 7595 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7596 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0)) 7597 return false; 7598 } 7599 7600 // In C++11, the above citation has "or virtual" added 7601 if (S.getLangOpts().CPlusPlus0x) { 7602 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7603 BaseEnd = ClassDecl->vbases_end(); 7604 Base != BaseEnd; ++Base) { 7605 assert(!Base->getType()->isDependentType() && 7606 "Cannot generate implicit members for class with dependent bases."); 7607 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7608 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7609 false, 0)) 7610 return false; 7611 } 7612 } 7613 7614 // -- for all the nonstatic data members of X that are of a class 7615 // type M (or array thereof), each such class type has a copy 7616 // assignment operator whose parameter is of type const M&, 7617 // const volatile M& or M. 7618 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7619 FieldEnd = ClassDecl->field_end(); 7620 Field != FieldEnd; ++Field) { 7621 QualType FieldType = S.Context.getBaseElementType(Field->getType()); 7622 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) 7623 if (!S.LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, 7624 false, 0)) 7625 return false; 7626 } 7627 7628 // Otherwise, the implicitly declared copy assignment operator will 7629 // have the form 7630 // 7631 // X& X::operator=(X&) 7632 7633 return true; 7634} 7635 7636Sema::ImplicitExceptionSpecification 7637Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 7638 CXXRecordDecl *ClassDecl = MD->getParent(); 7639 7640 ImplicitExceptionSpecification ExceptSpec(*this); 7641 if (ClassDecl->isInvalidDecl()) 7642 return ExceptSpec; 7643 7644 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 7645 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 7646 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 7647 7648 // C++ [except.spec]p14: 7649 // An implicitly declared special member function (Clause 12) shall have an 7650 // exception-specification. [...] 7651 7652 // It is unspecified whether or not an implicit copy assignment operator 7653 // attempts to deduplicate calls to assignment operators of virtual bases are 7654 // made. As such, this exception specification is effectively unspecified. 7655 // Based on a similar decision made for constness in C++0x, we're erring on 7656 // the side of assuming such calls to be made regardless of whether they 7657 // actually happen. 7658 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7659 BaseEnd = ClassDecl->bases_end(); 7660 Base != BaseEnd; ++Base) { 7661 if (Base->isVirtual()) 7662 continue; 7663 7664 CXXRecordDecl *BaseClassDecl 7665 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7666 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7667 ArgQuals, false, 0)) 7668 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7669 } 7670 7671 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7672 BaseEnd = ClassDecl->vbases_end(); 7673 Base != BaseEnd; ++Base) { 7674 CXXRecordDecl *BaseClassDecl 7675 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7676 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7677 ArgQuals, false, 0)) 7678 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7679 } 7680 7681 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7682 FieldEnd = ClassDecl->field_end(); 7683 Field != FieldEnd; 7684 ++Field) { 7685 QualType FieldType = Context.getBaseElementType(Field->getType()); 7686 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7687 if (CXXMethodDecl *CopyAssign = 7688 LookupCopyingAssignment(FieldClassDecl, 7689 ArgQuals | FieldType.getCVRQualifiers(), 7690 false, 0)) 7691 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 7692 } 7693 } 7694 7695 return ExceptSpec; 7696} 7697 7698CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7699 // Note: The following rules are largely analoguous to the copy 7700 // constructor rules. Note that virtual bases are not taken into account 7701 // for determining the argument type of the operator. Note also that 7702 // operators taking an object instead of a reference are allowed. 7703 7704 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7705 QualType RetType = Context.getLValueReferenceType(ArgType); 7706 if (isImplicitCopyAssignmentArgConst(*this, ClassDecl)) 7707 ArgType = ArgType.withConst(); 7708 ArgType = Context.getLValueReferenceType(ArgType); 7709 7710 // An implicitly-declared copy assignment operator is an inline public 7711 // member of its class. 7712 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7713 SourceLocation ClassLoc = ClassDecl->getLocation(); 7714 DeclarationNameInfo NameInfo(Name, ClassLoc); 7715 CXXMethodDecl *CopyAssignment 7716 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 7717 /*TInfo=*/0, /*isStatic=*/false, 7718 /*StorageClassAsWritten=*/SC_None, 7719 /*isInline=*/true, /*isConstexpr=*/false, 7720 SourceLocation()); 7721 CopyAssignment->setAccess(AS_public); 7722 CopyAssignment->setDefaulted(); 7723 CopyAssignment->setImplicit(); 7724 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7725 7726 // Build an exception specification pointing back at this member. 7727 FunctionProtoType::ExtProtoInfo EPI; 7728 EPI.ExceptionSpecType = EST_Unevaluated; 7729 EPI.ExceptionSpecDecl = CopyAssignment; 7730 CopyAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 7731 7732 // Add the parameter to the operator. 7733 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7734 ClassLoc, ClassLoc, /*Id=*/0, 7735 ArgType, /*TInfo=*/0, 7736 SC_None, 7737 SC_None, 0); 7738 CopyAssignment->setParams(FromParam); 7739 7740 // Note that we have added this copy-assignment operator. 7741 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7742 7743 if (Scope *S = getScopeForContext(ClassDecl)) 7744 PushOnScopeChains(CopyAssignment, S, false); 7745 ClassDecl->addDecl(CopyAssignment); 7746 7747 // C++0x [class.copy]p19: 7748 // .... If the class definition does not explicitly declare a copy 7749 // assignment operator, there is no user-declared move constructor, and 7750 // there is no user-declared move assignment operator, a copy assignment 7751 // operator is implicitly declared as defaulted. 7752 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7753 CopyAssignment->setDeletedAsWritten(); 7754 7755 AddOverriddenMethods(ClassDecl, CopyAssignment); 7756 return CopyAssignment; 7757} 7758 7759void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7760 CXXMethodDecl *CopyAssignOperator) { 7761 assert((CopyAssignOperator->isDefaulted() && 7762 CopyAssignOperator->isOverloadedOperator() && 7763 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7764 !CopyAssignOperator->doesThisDeclarationHaveABody() && 7765 !CopyAssignOperator->isDeleted()) && 7766 "DefineImplicitCopyAssignment called for wrong function"); 7767 7768 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7769 7770 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7771 CopyAssignOperator->setInvalidDecl(); 7772 return; 7773 } 7774 7775 CopyAssignOperator->setUsed(); 7776 7777 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7778 DiagnosticErrorTrap Trap(Diags); 7779 7780 // C++0x [class.copy]p30: 7781 // The implicitly-defined or explicitly-defaulted copy assignment operator 7782 // for a non-union class X performs memberwise copy assignment of its 7783 // subobjects. The direct base classes of X are assigned first, in the 7784 // order of their declaration in the base-specifier-list, and then the 7785 // immediate non-static data members of X are assigned, in the order in 7786 // which they were declared in the class definition. 7787 7788 // The statements that form the synthesized function body. 7789 SmallVector<Stmt*, 8> Statements; 7790 7791 // The parameter for the "other" object, which we are copying from. 7792 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7793 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7794 QualType OtherRefType = Other->getType(); 7795 if (const LValueReferenceType *OtherRef 7796 = OtherRefType->getAs<LValueReferenceType>()) { 7797 OtherRefType = OtherRef->getPointeeType(); 7798 OtherQuals = OtherRefType.getQualifiers(); 7799 } 7800 7801 // Our location for everything implicitly-generated. 7802 SourceLocation Loc = CopyAssignOperator->getLocation(); 7803 7804 // Construct a reference to the "other" object. We'll be using this 7805 // throughout the generated ASTs. 7806 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7807 assert(OtherRef && "Reference to parameter cannot fail!"); 7808 7809 // Construct the "this" pointer. We'll be using this throughout the generated 7810 // ASTs. 7811 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7812 assert(This && "Reference to this cannot fail!"); 7813 7814 // Assign base classes. 7815 bool Invalid = false; 7816 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7817 E = ClassDecl->bases_end(); Base != E; ++Base) { 7818 // Form the assignment: 7819 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7820 QualType BaseType = Base->getType().getUnqualifiedType(); 7821 if (!BaseType->isRecordType()) { 7822 Invalid = true; 7823 continue; 7824 } 7825 7826 CXXCastPath BasePath; 7827 BasePath.push_back(Base); 7828 7829 // Construct the "from" expression, which is an implicit cast to the 7830 // appropriately-qualified base type. 7831 Expr *From = OtherRef; 7832 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7833 CK_UncheckedDerivedToBase, 7834 VK_LValue, &BasePath).take(); 7835 7836 // Dereference "this". 7837 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7838 7839 // Implicitly cast "this" to the appropriately-qualified base type. 7840 To = ImpCastExprToType(To.take(), 7841 Context.getCVRQualifiedType(BaseType, 7842 CopyAssignOperator->getTypeQualifiers()), 7843 CK_UncheckedDerivedToBase, 7844 VK_LValue, &BasePath); 7845 7846 // Build the copy. 7847 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7848 To.get(), From, 7849 /*CopyingBaseSubobject=*/true, 7850 /*Copying=*/true); 7851 if (Copy.isInvalid()) { 7852 Diag(CurrentLocation, diag::note_member_synthesized_at) 7853 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7854 CopyAssignOperator->setInvalidDecl(); 7855 return; 7856 } 7857 7858 // Success! Record the copy. 7859 Statements.push_back(Copy.takeAs<Expr>()); 7860 } 7861 7862 // \brief Reference to the __builtin_memcpy function. 7863 Expr *BuiltinMemCpyRef = 0; 7864 // \brief Reference to the __builtin_objc_memmove_collectable function. 7865 Expr *CollectableMemCpyRef = 0; 7866 7867 // Assign non-static members. 7868 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7869 FieldEnd = ClassDecl->field_end(); 7870 Field != FieldEnd; ++Field) { 7871 if (Field->isUnnamedBitfield()) 7872 continue; 7873 7874 // Check for members of reference type; we can't copy those. 7875 if (Field->getType()->isReferenceType()) { 7876 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7877 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7878 Diag(Field->getLocation(), diag::note_declared_at); 7879 Diag(CurrentLocation, diag::note_member_synthesized_at) 7880 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7881 Invalid = true; 7882 continue; 7883 } 7884 7885 // Check for members of const-qualified, non-class type. 7886 QualType BaseType = Context.getBaseElementType(Field->getType()); 7887 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7888 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7889 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7890 Diag(Field->getLocation(), diag::note_declared_at); 7891 Diag(CurrentLocation, diag::note_member_synthesized_at) 7892 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7893 Invalid = true; 7894 continue; 7895 } 7896 7897 // Suppress assigning zero-width bitfields. 7898 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7899 continue; 7900 7901 QualType FieldType = Field->getType().getNonReferenceType(); 7902 if (FieldType->isIncompleteArrayType()) { 7903 assert(ClassDecl->hasFlexibleArrayMember() && 7904 "Incomplete array type is not valid"); 7905 continue; 7906 } 7907 7908 // Build references to the field in the object we're copying from and to. 7909 CXXScopeSpec SS; // Intentionally empty 7910 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7911 LookupMemberName); 7912 MemberLookup.addDecl(*Field); 7913 MemberLookup.resolveKind(); 7914 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7915 Loc, /*IsArrow=*/false, 7916 SS, SourceLocation(), 0, 7917 MemberLookup, 0); 7918 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7919 Loc, /*IsArrow=*/true, 7920 SS, SourceLocation(), 0, 7921 MemberLookup, 0); 7922 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7923 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7924 7925 // If the field should be copied with __builtin_memcpy rather than via 7926 // explicit assignments, do so. This optimization only applies for arrays 7927 // of scalars and arrays of class type with trivial copy-assignment 7928 // operators. 7929 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7930 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7931 // Compute the size of the memory buffer to be copied. 7932 QualType SizeType = Context.getSizeType(); 7933 llvm::APInt Size(Context.getTypeSize(SizeType), 7934 Context.getTypeSizeInChars(BaseType).getQuantity()); 7935 for (const ConstantArrayType *Array 7936 = Context.getAsConstantArrayType(FieldType); 7937 Array; 7938 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7939 llvm::APInt ArraySize 7940 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7941 Size *= ArraySize; 7942 } 7943 7944 // Take the address of the field references for "from" and "to". 7945 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7946 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7947 7948 bool NeedsCollectableMemCpy = 7949 (BaseType->isRecordType() && 7950 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7951 7952 if (NeedsCollectableMemCpy) { 7953 if (!CollectableMemCpyRef) { 7954 // Create a reference to the __builtin_objc_memmove_collectable function. 7955 LookupResult R(*this, 7956 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7957 Loc, LookupOrdinaryName); 7958 LookupName(R, TUScope, true); 7959 7960 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7961 if (!CollectableMemCpy) { 7962 // Something went horribly wrong earlier, and we will have 7963 // complained about it. 7964 Invalid = true; 7965 continue; 7966 } 7967 7968 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7969 Context.BuiltinFnTy, 7970 VK_RValue, Loc, 0).take(); 7971 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7972 } 7973 } 7974 // Create a reference to the __builtin_memcpy builtin function. 7975 else if (!BuiltinMemCpyRef) { 7976 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7977 LookupOrdinaryName); 7978 LookupName(R, TUScope, true); 7979 7980 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7981 if (!BuiltinMemCpy) { 7982 // Something went horribly wrong earlier, and we will have complained 7983 // about it. 7984 Invalid = true; 7985 continue; 7986 } 7987 7988 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7989 Context.BuiltinFnTy, 7990 VK_RValue, Loc, 0).take(); 7991 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7992 } 7993 7994 SmallVector<Expr*, 8> CallArgs; 7995 CallArgs.push_back(To.takeAs<Expr>()); 7996 CallArgs.push_back(From.takeAs<Expr>()); 7997 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7998 ExprResult Call = ExprError(); 7999 if (NeedsCollectableMemCpy) 8000 Call = ActOnCallExpr(/*Scope=*/0, 8001 CollectableMemCpyRef, 8002 Loc, CallArgs, 8003 Loc); 8004 else 8005 Call = ActOnCallExpr(/*Scope=*/0, 8006 BuiltinMemCpyRef, 8007 Loc, CallArgs, 8008 Loc); 8009 8010 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8011 Statements.push_back(Call.takeAs<Expr>()); 8012 continue; 8013 } 8014 8015 // Build the copy of this field. 8016 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 8017 To.get(), From.get(), 8018 /*CopyingBaseSubobject=*/false, 8019 /*Copying=*/true); 8020 if (Copy.isInvalid()) { 8021 Diag(CurrentLocation, diag::note_member_synthesized_at) 8022 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8023 CopyAssignOperator->setInvalidDecl(); 8024 return; 8025 } 8026 8027 // Success! Record the copy. 8028 Statements.push_back(Copy.takeAs<Stmt>()); 8029 } 8030 8031 if (!Invalid) { 8032 // Add a "return *this;" 8033 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8034 8035 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8036 if (Return.isInvalid()) 8037 Invalid = true; 8038 else { 8039 Statements.push_back(Return.takeAs<Stmt>()); 8040 8041 if (Trap.hasErrorOccurred()) { 8042 Diag(CurrentLocation, diag::note_member_synthesized_at) 8043 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8044 Invalid = true; 8045 } 8046 } 8047 } 8048 8049 if (Invalid) { 8050 CopyAssignOperator->setInvalidDecl(); 8051 return; 8052 } 8053 8054 StmtResult Body; 8055 { 8056 CompoundScopeRAII CompoundScope(*this); 8057 Body = ActOnCompoundStmt(Loc, Loc, Statements, 8058 /*isStmtExpr=*/false); 8059 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8060 } 8061 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 8062 8063 if (ASTMutationListener *L = getASTMutationListener()) { 8064 L->CompletedImplicitDefinition(CopyAssignOperator); 8065 } 8066} 8067 8068Sema::ImplicitExceptionSpecification 8069Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 8070 CXXRecordDecl *ClassDecl = MD->getParent(); 8071 8072 ImplicitExceptionSpecification ExceptSpec(*this); 8073 if (ClassDecl->isInvalidDecl()) 8074 return ExceptSpec; 8075 8076 // C++0x [except.spec]p14: 8077 // An implicitly declared special member function (Clause 12) shall have an 8078 // exception-specification. [...] 8079 8080 // It is unspecified whether or not an implicit move assignment operator 8081 // attempts to deduplicate calls to assignment operators of virtual bases are 8082 // made. As such, this exception specification is effectively unspecified. 8083 // Based on a similar decision made for constness in C++0x, we're erring on 8084 // the side of assuming such calls to be made regardless of whether they 8085 // actually happen. 8086 // Note that a move constructor is not implicitly declared when there are 8087 // virtual bases, but it can still be user-declared and explicitly defaulted. 8088 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8089 BaseEnd = ClassDecl->bases_end(); 8090 Base != BaseEnd; ++Base) { 8091 if (Base->isVirtual()) 8092 continue; 8093 8094 CXXRecordDecl *BaseClassDecl 8095 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8096 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8097 0, false, 0)) 8098 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8099 } 8100 8101 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8102 BaseEnd = ClassDecl->vbases_end(); 8103 Base != BaseEnd; ++Base) { 8104 CXXRecordDecl *BaseClassDecl 8105 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8106 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8107 0, false, 0)) 8108 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8109 } 8110 8111 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8112 FieldEnd = ClassDecl->field_end(); 8113 Field != FieldEnd; 8114 ++Field) { 8115 QualType FieldType = Context.getBaseElementType(Field->getType()); 8116 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8117 if (CXXMethodDecl *MoveAssign = 8118 LookupMovingAssignment(FieldClassDecl, 8119 FieldType.getCVRQualifiers(), 8120 false, 0)) 8121 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 8122 } 8123 } 8124 8125 return ExceptSpec; 8126} 8127 8128/// Determine whether the class type has any direct or indirect virtual base 8129/// classes which have a non-trivial move assignment operator. 8130static bool 8131hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 8132 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8133 BaseEnd = ClassDecl->vbases_end(); 8134 Base != BaseEnd; ++Base) { 8135 CXXRecordDecl *BaseClass = 8136 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8137 8138 // Try to declare the move assignment. If it would be deleted, then the 8139 // class does not have a non-trivial move assignment. 8140 if (BaseClass->needsImplicitMoveAssignment()) 8141 S.DeclareImplicitMoveAssignment(BaseClass); 8142 8143 // If the class has both a trivial move assignment and a non-trivial move 8144 // assignment, hasTrivialMoveAssignment() is false. 8145 if (BaseClass->hasDeclaredMoveAssignment() && 8146 !BaseClass->hasTrivialMoveAssignment()) 8147 return true; 8148 } 8149 8150 return false; 8151} 8152 8153/// Determine whether the given type either has a move constructor or is 8154/// trivially copyable. 8155static bool 8156hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8157 Type = S.Context.getBaseElementType(Type); 8158 8159 // FIXME: Technically, non-trivially-copyable non-class types, such as 8160 // reference types, are supposed to return false here, but that appears 8161 // to be a standard defect. 8162 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8163 if (!ClassDecl || !ClassDecl->getDefinition() || ClassDecl->isInvalidDecl()) 8164 return true; 8165 8166 if (Type.isTriviallyCopyableType(S.Context)) 8167 return true; 8168 8169 if (IsConstructor) { 8170 if (ClassDecl->needsImplicitMoveConstructor()) 8171 S.DeclareImplicitMoveConstructor(ClassDecl); 8172 return ClassDecl->hasDeclaredMoveConstructor(); 8173 } 8174 8175 if (ClassDecl->needsImplicitMoveAssignment()) 8176 S.DeclareImplicitMoveAssignment(ClassDecl); 8177 return ClassDecl->hasDeclaredMoveAssignment(); 8178} 8179 8180/// Determine whether all non-static data members and direct or virtual bases 8181/// of class \p ClassDecl have either a move operation, or are trivially 8182/// copyable. 8183static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8184 bool IsConstructor) { 8185 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8186 BaseEnd = ClassDecl->bases_end(); 8187 Base != BaseEnd; ++Base) { 8188 if (Base->isVirtual()) 8189 continue; 8190 8191 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8192 return false; 8193 } 8194 8195 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8196 BaseEnd = ClassDecl->vbases_end(); 8197 Base != BaseEnd; ++Base) { 8198 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8199 return false; 8200 } 8201 8202 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8203 FieldEnd = ClassDecl->field_end(); 8204 Field != FieldEnd; ++Field) { 8205 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 8206 return false; 8207 } 8208 8209 return true; 8210} 8211 8212CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8213 // C++11 [class.copy]p20: 8214 // If the definition of a class X does not explicitly declare a move 8215 // assignment operator, one will be implicitly declared as defaulted 8216 // if and only if: 8217 // 8218 // - [first 4 bullets] 8219 assert(ClassDecl->needsImplicitMoveAssignment()); 8220 8221 // [Checked after we build the declaration] 8222 // - the move assignment operator would not be implicitly defined as 8223 // deleted, 8224 8225 // [DR1402]: 8226 // - X has no direct or indirect virtual base class with a non-trivial 8227 // move assignment operator, and 8228 // - each of X's non-static data members and direct or virtual base classes 8229 // has a type that either has a move assignment operator or is trivially 8230 // copyable. 8231 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8232 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8233 ClassDecl->setFailedImplicitMoveAssignment(); 8234 return 0; 8235 } 8236 8237 // Note: The following rules are largely analoguous to the move 8238 // constructor rules. 8239 8240 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8241 QualType RetType = Context.getLValueReferenceType(ArgType); 8242 ArgType = Context.getRValueReferenceType(ArgType); 8243 8244 // An implicitly-declared move assignment operator is an inline public 8245 // member of its class. 8246 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8247 SourceLocation ClassLoc = ClassDecl->getLocation(); 8248 DeclarationNameInfo NameInfo(Name, ClassLoc); 8249 CXXMethodDecl *MoveAssignment 8250 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8251 /*TInfo=*/0, /*isStatic=*/false, 8252 /*StorageClassAsWritten=*/SC_None, 8253 /*isInline=*/true, 8254 /*isConstexpr=*/false, 8255 SourceLocation()); 8256 MoveAssignment->setAccess(AS_public); 8257 MoveAssignment->setDefaulted(); 8258 MoveAssignment->setImplicit(); 8259 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8260 8261 // Build an exception specification pointing back at this member. 8262 FunctionProtoType::ExtProtoInfo EPI; 8263 EPI.ExceptionSpecType = EST_Unevaluated; 8264 EPI.ExceptionSpecDecl = MoveAssignment; 8265 MoveAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 8266 8267 // Add the parameter to the operator. 8268 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8269 ClassLoc, ClassLoc, /*Id=*/0, 8270 ArgType, /*TInfo=*/0, 8271 SC_None, 8272 SC_None, 0); 8273 MoveAssignment->setParams(FromParam); 8274 8275 // Note that we have added this copy-assignment operator. 8276 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8277 8278 // C++0x [class.copy]p9: 8279 // If the definition of a class X does not explicitly declare a move 8280 // assignment operator, one will be implicitly declared as defaulted if and 8281 // only if: 8282 // [...] 8283 // - the move assignment operator would not be implicitly defined as 8284 // deleted. 8285 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8286 // Cache this result so that we don't try to generate this over and over 8287 // on every lookup, leaking memory and wasting time. 8288 ClassDecl->setFailedImplicitMoveAssignment(); 8289 return 0; 8290 } 8291 8292 if (Scope *S = getScopeForContext(ClassDecl)) 8293 PushOnScopeChains(MoveAssignment, S, false); 8294 ClassDecl->addDecl(MoveAssignment); 8295 8296 AddOverriddenMethods(ClassDecl, MoveAssignment); 8297 return MoveAssignment; 8298} 8299 8300void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8301 CXXMethodDecl *MoveAssignOperator) { 8302 assert((MoveAssignOperator->isDefaulted() && 8303 MoveAssignOperator->isOverloadedOperator() && 8304 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8305 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8306 !MoveAssignOperator->isDeleted()) && 8307 "DefineImplicitMoveAssignment called for wrong function"); 8308 8309 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8310 8311 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8312 MoveAssignOperator->setInvalidDecl(); 8313 return; 8314 } 8315 8316 MoveAssignOperator->setUsed(); 8317 8318 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8319 DiagnosticErrorTrap Trap(Diags); 8320 8321 // C++0x [class.copy]p28: 8322 // The implicitly-defined or move assignment operator for a non-union class 8323 // X performs memberwise move assignment of its subobjects. The direct base 8324 // classes of X are assigned first, in the order of their declaration in the 8325 // base-specifier-list, and then the immediate non-static data members of X 8326 // are assigned, in the order in which they were declared in the class 8327 // definition. 8328 8329 // The statements that form the synthesized function body. 8330 SmallVector<Stmt*, 8> Statements; 8331 8332 // The parameter for the "other" object, which we are move from. 8333 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8334 QualType OtherRefType = Other->getType()-> 8335 getAs<RValueReferenceType>()->getPointeeType(); 8336 assert(OtherRefType.getQualifiers() == 0 && 8337 "Bad argument type of defaulted move assignment"); 8338 8339 // Our location for everything implicitly-generated. 8340 SourceLocation Loc = MoveAssignOperator->getLocation(); 8341 8342 // Construct a reference to the "other" object. We'll be using this 8343 // throughout the generated ASTs. 8344 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8345 assert(OtherRef && "Reference to parameter cannot fail!"); 8346 // Cast to rvalue. 8347 OtherRef = CastForMoving(*this, OtherRef); 8348 8349 // Construct the "this" pointer. We'll be using this throughout the generated 8350 // ASTs. 8351 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8352 assert(This && "Reference to this cannot fail!"); 8353 8354 // Assign base classes. 8355 bool Invalid = false; 8356 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8357 E = ClassDecl->bases_end(); Base != E; ++Base) { 8358 // Form the assignment: 8359 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8360 QualType BaseType = Base->getType().getUnqualifiedType(); 8361 if (!BaseType->isRecordType()) { 8362 Invalid = true; 8363 continue; 8364 } 8365 8366 CXXCastPath BasePath; 8367 BasePath.push_back(Base); 8368 8369 // Construct the "from" expression, which is an implicit cast to the 8370 // appropriately-qualified base type. 8371 Expr *From = OtherRef; 8372 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8373 VK_XValue, &BasePath).take(); 8374 8375 // Dereference "this". 8376 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8377 8378 // Implicitly cast "this" to the appropriately-qualified base type. 8379 To = ImpCastExprToType(To.take(), 8380 Context.getCVRQualifiedType(BaseType, 8381 MoveAssignOperator->getTypeQualifiers()), 8382 CK_UncheckedDerivedToBase, 8383 VK_LValue, &BasePath); 8384 8385 // Build the move. 8386 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8387 To.get(), From, 8388 /*CopyingBaseSubobject=*/true, 8389 /*Copying=*/false); 8390 if (Move.isInvalid()) { 8391 Diag(CurrentLocation, diag::note_member_synthesized_at) 8392 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8393 MoveAssignOperator->setInvalidDecl(); 8394 return; 8395 } 8396 8397 // Success! Record the move. 8398 Statements.push_back(Move.takeAs<Expr>()); 8399 } 8400 8401 // \brief Reference to the __builtin_memcpy function. 8402 Expr *BuiltinMemCpyRef = 0; 8403 // \brief Reference to the __builtin_objc_memmove_collectable function. 8404 Expr *CollectableMemCpyRef = 0; 8405 8406 // Assign non-static members. 8407 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8408 FieldEnd = ClassDecl->field_end(); 8409 Field != FieldEnd; ++Field) { 8410 if (Field->isUnnamedBitfield()) 8411 continue; 8412 8413 // Check for members of reference type; we can't move those. 8414 if (Field->getType()->isReferenceType()) { 8415 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8416 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8417 Diag(Field->getLocation(), diag::note_declared_at); 8418 Diag(CurrentLocation, diag::note_member_synthesized_at) 8419 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8420 Invalid = true; 8421 continue; 8422 } 8423 8424 // Check for members of const-qualified, non-class type. 8425 QualType BaseType = Context.getBaseElementType(Field->getType()); 8426 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8427 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8428 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8429 Diag(Field->getLocation(), diag::note_declared_at); 8430 Diag(CurrentLocation, diag::note_member_synthesized_at) 8431 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8432 Invalid = true; 8433 continue; 8434 } 8435 8436 // Suppress assigning zero-width bitfields. 8437 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8438 continue; 8439 8440 QualType FieldType = Field->getType().getNonReferenceType(); 8441 if (FieldType->isIncompleteArrayType()) { 8442 assert(ClassDecl->hasFlexibleArrayMember() && 8443 "Incomplete array type is not valid"); 8444 continue; 8445 } 8446 8447 // Build references to the field in the object we're copying from and to. 8448 CXXScopeSpec SS; // Intentionally empty 8449 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8450 LookupMemberName); 8451 MemberLookup.addDecl(*Field); 8452 MemberLookup.resolveKind(); 8453 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8454 Loc, /*IsArrow=*/false, 8455 SS, SourceLocation(), 0, 8456 MemberLookup, 0); 8457 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8458 Loc, /*IsArrow=*/true, 8459 SS, SourceLocation(), 0, 8460 MemberLookup, 0); 8461 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8462 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8463 8464 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8465 "Member reference with rvalue base must be rvalue except for reference " 8466 "members, which aren't allowed for move assignment."); 8467 8468 // If the field should be copied with __builtin_memcpy rather than via 8469 // explicit assignments, do so. This optimization only applies for arrays 8470 // of scalars and arrays of class type with trivial move-assignment 8471 // operators. 8472 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8473 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8474 // Compute the size of the memory buffer to be copied. 8475 QualType SizeType = Context.getSizeType(); 8476 llvm::APInt Size(Context.getTypeSize(SizeType), 8477 Context.getTypeSizeInChars(BaseType).getQuantity()); 8478 for (const ConstantArrayType *Array 8479 = Context.getAsConstantArrayType(FieldType); 8480 Array; 8481 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8482 llvm::APInt ArraySize 8483 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8484 Size *= ArraySize; 8485 } 8486 8487 // Take the address of the field references for "from" and "to". We 8488 // directly construct UnaryOperators here because semantic analysis 8489 // does not permit us to take the address of an xvalue. 8490 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8491 Context.getPointerType(From.get()->getType()), 8492 VK_RValue, OK_Ordinary, Loc); 8493 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8494 Context.getPointerType(To.get()->getType()), 8495 VK_RValue, OK_Ordinary, Loc); 8496 8497 bool NeedsCollectableMemCpy = 8498 (BaseType->isRecordType() && 8499 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8500 8501 if (NeedsCollectableMemCpy) { 8502 if (!CollectableMemCpyRef) { 8503 // Create a reference to the __builtin_objc_memmove_collectable function. 8504 LookupResult R(*this, 8505 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8506 Loc, LookupOrdinaryName); 8507 LookupName(R, TUScope, true); 8508 8509 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8510 if (!CollectableMemCpy) { 8511 // Something went horribly wrong earlier, and we will have 8512 // complained about it. 8513 Invalid = true; 8514 continue; 8515 } 8516 8517 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8518 Context.BuiltinFnTy, 8519 VK_RValue, Loc, 0).take(); 8520 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8521 } 8522 } 8523 // Create a reference to the __builtin_memcpy builtin function. 8524 else if (!BuiltinMemCpyRef) { 8525 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8526 LookupOrdinaryName); 8527 LookupName(R, TUScope, true); 8528 8529 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8530 if (!BuiltinMemCpy) { 8531 // Something went horribly wrong earlier, and we will have complained 8532 // about it. 8533 Invalid = true; 8534 continue; 8535 } 8536 8537 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8538 Context.BuiltinFnTy, 8539 VK_RValue, Loc, 0).take(); 8540 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8541 } 8542 8543 SmallVector<Expr*, 8> CallArgs; 8544 CallArgs.push_back(To.takeAs<Expr>()); 8545 CallArgs.push_back(From.takeAs<Expr>()); 8546 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8547 ExprResult Call = ExprError(); 8548 if (NeedsCollectableMemCpy) 8549 Call = ActOnCallExpr(/*Scope=*/0, 8550 CollectableMemCpyRef, 8551 Loc, CallArgs, 8552 Loc); 8553 else 8554 Call = ActOnCallExpr(/*Scope=*/0, 8555 BuiltinMemCpyRef, 8556 Loc, CallArgs, 8557 Loc); 8558 8559 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8560 Statements.push_back(Call.takeAs<Expr>()); 8561 continue; 8562 } 8563 8564 // Build the move of this field. 8565 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8566 To.get(), From.get(), 8567 /*CopyingBaseSubobject=*/false, 8568 /*Copying=*/false); 8569 if (Move.isInvalid()) { 8570 Diag(CurrentLocation, diag::note_member_synthesized_at) 8571 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8572 MoveAssignOperator->setInvalidDecl(); 8573 return; 8574 } 8575 8576 // Success! Record the copy. 8577 Statements.push_back(Move.takeAs<Stmt>()); 8578 } 8579 8580 if (!Invalid) { 8581 // Add a "return *this;" 8582 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8583 8584 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8585 if (Return.isInvalid()) 8586 Invalid = true; 8587 else { 8588 Statements.push_back(Return.takeAs<Stmt>()); 8589 8590 if (Trap.hasErrorOccurred()) { 8591 Diag(CurrentLocation, diag::note_member_synthesized_at) 8592 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8593 Invalid = true; 8594 } 8595 } 8596 } 8597 8598 if (Invalid) { 8599 MoveAssignOperator->setInvalidDecl(); 8600 return; 8601 } 8602 8603 StmtResult Body; 8604 { 8605 CompoundScopeRAII CompoundScope(*this); 8606 Body = ActOnCompoundStmt(Loc, Loc, Statements, 8607 /*isStmtExpr=*/false); 8608 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8609 } 8610 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8611 8612 if (ASTMutationListener *L = getASTMutationListener()) { 8613 L->CompletedImplicitDefinition(MoveAssignOperator); 8614 } 8615} 8616 8617/// Determine whether an implicit copy constructor for ClassDecl has a const 8618/// argument. 8619/// FIXME: It ought to be possible to store this on the record. 8620static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl) { 8621 if (ClassDecl->isInvalidDecl()) 8622 return true; 8623 8624 // C++ [class.copy]p5: 8625 // The implicitly-declared copy constructor for a class X will 8626 // have the form 8627 // 8628 // X::X(const X&) 8629 // 8630 // if 8631 // -- each direct or virtual base class B of X has a copy 8632 // constructor whose first parameter is of type const B& or 8633 // const volatile B&, and 8634 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8635 BaseEnd = ClassDecl->bases_end(); 8636 Base != BaseEnd; ++Base) { 8637 // Virtual bases are handled below. 8638 if (Base->isVirtual()) 8639 continue; 8640 8641 CXXRecordDecl *BaseClassDecl 8642 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8643 // FIXME: This lookup is wrong. If the copy ctor for a member or base is 8644 // ambiguous, we should still produce a constructor with a const-qualified 8645 // parameter. 8646 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const)) 8647 return false; 8648 } 8649 8650 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8651 BaseEnd = ClassDecl->vbases_end(); 8652 Base != BaseEnd; ++Base) { 8653 CXXRecordDecl *BaseClassDecl 8654 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8655 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const)) 8656 return false; 8657 } 8658 8659 // -- for all the nonstatic data members of X that are of a 8660 // class type M (or array thereof), each such class type 8661 // has a copy constructor whose first parameter is of type 8662 // const M& or const volatile M&. 8663 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8664 FieldEnd = ClassDecl->field_end(); 8665 Field != FieldEnd; ++Field) { 8666 QualType FieldType = S.Context.getBaseElementType(Field->getType()); 8667 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8668 if (!S.LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const)) 8669 return false; 8670 } 8671 } 8672 8673 // Otherwise, the implicitly declared copy constructor will have 8674 // the form 8675 // 8676 // X::X(X&) 8677 8678 return true; 8679} 8680 8681Sema::ImplicitExceptionSpecification 8682Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 8683 CXXRecordDecl *ClassDecl = MD->getParent(); 8684 8685 ImplicitExceptionSpecification ExceptSpec(*this); 8686 if (ClassDecl->isInvalidDecl()) 8687 return ExceptSpec; 8688 8689 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 8690 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 8691 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 8692 8693 // C++ [except.spec]p14: 8694 // An implicitly declared special member function (Clause 12) shall have an 8695 // exception-specification. [...] 8696 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8697 BaseEnd = ClassDecl->bases_end(); 8698 Base != BaseEnd; 8699 ++Base) { 8700 // Virtual bases are handled below. 8701 if (Base->isVirtual()) 8702 continue; 8703 8704 CXXRecordDecl *BaseClassDecl 8705 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8706 if (CXXConstructorDecl *CopyConstructor = 8707 LookupCopyingConstructor(BaseClassDecl, Quals)) 8708 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8709 } 8710 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8711 BaseEnd = ClassDecl->vbases_end(); 8712 Base != BaseEnd; 8713 ++Base) { 8714 CXXRecordDecl *BaseClassDecl 8715 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8716 if (CXXConstructorDecl *CopyConstructor = 8717 LookupCopyingConstructor(BaseClassDecl, Quals)) 8718 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8719 } 8720 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8721 FieldEnd = ClassDecl->field_end(); 8722 Field != FieldEnd; 8723 ++Field) { 8724 QualType FieldType = Context.getBaseElementType(Field->getType()); 8725 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8726 if (CXXConstructorDecl *CopyConstructor = 8727 LookupCopyingConstructor(FieldClassDecl, 8728 Quals | FieldType.getCVRQualifiers())) 8729 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 8730 } 8731 } 8732 8733 return ExceptSpec; 8734} 8735 8736CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8737 CXXRecordDecl *ClassDecl) { 8738 // C++ [class.copy]p4: 8739 // If the class definition does not explicitly declare a copy 8740 // constructor, one is declared implicitly. 8741 8742 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8743 QualType ArgType = ClassType; 8744 bool Const = isImplicitCopyCtorArgConst(*this, ClassDecl); 8745 if (Const) 8746 ArgType = ArgType.withConst(); 8747 ArgType = Context.getLValueReferenceType(ArgType); 8748 8749 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8750 CXXCopyConstructor, 8751 Const); 8752 8753 DeclarationName Name 8754 = Context.DeclarationNames.getCXXConstructorName( 8755 Context.getCanonicalType(ClassType)); 8756 SourceLocation ClassLoc = ClassDecl->getLocation(); 8757 DeclarationNameInfo NameInfo(Name, ClassLoc); 8758 8759 // An implicitly-declared copy constructor is an inline public 8760 // member of its class. 8761 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8762 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 8763 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8764 Constexpr); 8765 CopyConstructor->setAccess(AS_public); 8766 CopyConstructor->setDefaulted(); 8767 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8768 8769 // Build an exception specification pointing back at this member. 8770 FunctionProtoType::ExtProtoInfo EPI; 8771 EPI.ExceptionSpecType = EST_Unevaluated; 8772 EPI.ExceptionSpecDecl = CopyConstructor; 8773 CopyConstructor->setType( 8774 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 8775 8776 // Note that we have declared this constructor. 8777 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8778 8779 // Add the parameter to the constructor. 8780 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8781 ClassLoc, ClassLoc, 8782 /*IdentifierInfo=*/0, 8783 ArgType, /*TInfo=*/0, 8784 SC_None, 8785 SC_None, 0); 8786 CopyConstructor->setParams(FromParam); 8787 8788 if (Scope *S = getScopeForContext(ClassDecl)) 8789 PushOnScopeChains(CopyConstructor, S, false); 8790 ClassDecl->addDecl(CopyConstructor); 8791 8792 // C++11 [class.copy]p8: 8793 // ... If the class definition does not explicitly declare a copy 8794 // constructor, there is no user-declared move constructor, and there is no 8795 // user-declared move assignment operator, a copy constructor is implicitly 8796 // declared as defaulted. 8797 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8798 CopyConstructor->setDeletedAsWritten(); 8799 8800 return CopyConstructor; 8801} 8802 8803void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8804 CXXConstructorDecl *CopyConstructor) { 8805 assert((CopyConstructor->isDefaulted() && 8806 CopyConstructor->isCopyConstructor() && 8807 !CopyConstructor->doesThisDeclarationHaveABody() && 8808 !CopyConstructor->isDeleted()) && 8809 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8810 8811 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8812 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8813 8814 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8815 DiagnosticErrorTrap Trap(Diags); 8816 8817 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8818 Trap.hasErrorOccurred()) { 8819 Diag(CurrentLocation, diag::note_member_synthesized_at) 8820 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8821 CopyConstructor->setInvalidDecl(); 8822 } else { 8823 Sema::CompoundScopeRAII CompoundScope(*this); 8824 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8825 CopyConstructor->getLocation(), 8826 MultiStmtArg(), 8827 /*isStmtExpr=*/false) 8828 .takeAs<Stmt>()); 8829 CopyConstructor->setImplicitlyDefined(true); 8830 } 8831 8832 CopyConstructor->setUsed(); 8833 if (ASTMutationListener *L = getASTMutationListener()) { 8834 L->CompletedImplicitDefinition(CopyConstructor); 8835 } 8836} 8837 8838Sema::ImplicitExceptionSpecification 8839Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 8840 CXXRecordDecl *ClassDecl = MD->getParent(); 8841 8842 // C++ [except.spec]p14: 8843 // An implicitly declared special member function (Clause 12) shall have an 8844 // exception-specification. [...] 8845 ImplicitExceptionSpecification ExceptSpec(*this); 8846 if (ClassDecl->isInvalidDecl()) 8847 return ExceptSpec; 8848 8849 // Direct base-class constructors. 8850 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8851 BEnd = ClassDecl->bases_end(); 8852 B != BEnd; ++B) { 8853 if (B->isVirtual()) // Handled below. 8854 continue; 8855 8856 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8857 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8858 CXXConstructorDecl *Constructor = 8859 LookupMovingConstructor(BaseClassDecl, 0); 8860 // If this is a deleted function, add it anyway. This might be conformant 8861 // with the standard. This might not. I'm not sure. It might not matter. 8862 if (Constructor) 8863 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8864 } 8865 } 8866 8867 // Virtual base-class constructors. 8868 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8869 BEnd = ClassDecl->vbases_end(); 8870 B != BEnd; ++B) { 8871 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8872 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8873 CXXConstructorDecl *Constructor = 8874 LookupMovingConstructor(BaseClassDecl, 0); 8875 // If this is a deleted function, add it anyway. This might be conformant 8876 // with the standard. This might not. I'm not sure. It might not matter. 8877 if (Constructor) 8878 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8879 } 8880 } 8881 8882 // Field constructors. 8883 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8884 FEnd = ClassDecl->field_end(); 8885 F != FEnd; ++F) { 8886 QualType FieldType = Context.getBaseElementType(F->getType()); 8887 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 8888 CXXConstructorDecl *Constructor = 8889 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 8890 // If this is a deleted function, add it anyway. This might be conformant 8891 // with the standard. This might not. I'm not sure. It might not matter. 8892 // In particular, the problem is that this function never gets called. It 8893 // might just be ill-formed because this function attempts to refer to 8894 // a deleted function here. 8895 if (Constructor) 8896 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 8897 } 8898 } 8899 8900 return ExceptSpec; 8901} 8902 8903CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8904 CXXRecordDecl *ClassDecl) { 8905 // C++11 [class.copy]p9: 8906 // If the definition of a class X does not explicitly declare a move 8907 // constructor, one will be implicitly declared as defaulted if and only if: 8908 // 8909 // - [first 4 bullets] 8910 assert(ClassDecl->needsImplicitMoveConstructor()); 8911 8912 // [Checked after we build the declaration] 8913 // - the move assignment operator would not be implicitly defined as 8914 // deleted, 8915 8916 // [DR1402]: 8917 // - each of X's non-static data members and direct or virtual base classes 8918 // has a type that either has a move constructor or is trivially copyable. 8919 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 8920 ClassDecl->setFailedImplicitMoveConstructor(); 8921 return 0; 8922 } 8923 8924 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8925 QualType ArgType = Context.getRValueReferenceType(ClassType); 8926 8927 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8928 CXXMoveConstructor, 8929 false); 8930 8931 DeclarationName Name 8932 = Context.DeclarationNames.getCXXConstructorName( 8933 Context.getCanonicalType(ClassType)); 8934 SourceLocation ClassLoc = ClassDecl->getLocation(); 8935 DeclarationNameInfo NameInfo(Name, ClassLoc); 8936 8937 // C++0x [class.copy]p11: 8938 // An implicitly-declared copy/move constructor is an inline public 8939 // member of its class. 8940 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8941 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 8942 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8943 Constexpr); 8944 MoveConstructor->setAccess(AS_public); 8945 MoveConstructor->setDefaulted(); 8946 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8947 8948 // Build an exception specification pointing back at this member. 8949 FunctionProtoType::ExtProtoInfo EPI; 8950 EPI.ExceptionSpecType = EST_Unevaluated; 8951 EPI.ExceptionSpecDecl = MoveConstructor; 8952 MoveConstructor->setType( 8953 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 8954 8955 // Add the parameter to the constructor. 8956 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8957 ClassLoc, ClassLoc, 8958 /*IdentifierInfo=*/0, 8959 ArgType, /*TInfo=*/0, 8960 SC_None, 8961 SC_None, 0); 8962 MoveConstructor->setParams(FromParam); 8963 8964 // C++0x [class.copy]p9: 8965 // If the definition of a class X does not explicitly declare a move 8966 // constructor, one will be implicitly declared as defaulted if and only if: 8967 // [...] 8968 // - the move constructor would not be implicitly defined as deleted. 8969 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8970 // Cache this result so that we don't try to generate this over and over 8971 // on every lookup, leaking memory and wasting time. 8972 ClassDecl->setFailedImplicitMoveConstructor(); 8973 return 0; 8974 } 8975 8976 // Note that we have declared this constructor. 8977 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8978 8979 if (Scope *S = getScopeForContext(ClassDecl)) 8980 PushOnScopeChains(MoveConstructor, S, false); 8981 ClassDecl->addDecl(MoveConstructor); 8982 8983 return MoveConstructor; 8984} 8985 8986void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8987 CXXConstructorDecl *MoveConstructor) { 8988 assert((MoveConstructor->isDefaulted() && 8989 MoveConstructor->isMoveConstructor() && 8990 !MoveConstructor->doesThisDeclarationHaveABody() && 8991 !MoveConstructor->isDeleted()) && 8992 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8993 8994 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8995 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8996 8997 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8998 DiagnosticErrorTrap Trap(Diags); 8999 9000 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 9001 Trap.hasErrorOccurred()) { 9002 Diag(CurrentLocation, diag::note_member_synthesized_at) 9003 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 9004 MoveConstructor->setInvalidDecl(); 9005 } else { 9006 Sema::CompoundScopeRAII CompoundScope(*this); 9007 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 9008 MoveConstructor->getLocation(), 9009 MultiStmtArg(), 9010 /*isStmtExpr=*/false) 9011 .takeAs<Stmt>()); 9012 MoveConstructor->setImplicitlyDefined(true); 9013 } 9014 9015 MoveConstructor->setUsed(); 9016 9017 if (ASTMutationListener *L = getASTMutationListener()) { 9018 L->CompletedImplicitDefinition(MoveConstructor); 9019 } 9020} 9021 9022bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 9023 return FD->isDeleted() && 9024 (FD->isDefaulted() || FD->isImplicit()) && 9025 isa<CXXMethodDecl>(FD); 9026} 9027 9028/// \brief Mark the call operator of the given lambda closure type as "used". 9029static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 9030 CXXMethodDecl *CallOperator 9031 = cast<CXXMethodDecl>( 9032 *Lambda->lookup( 9033 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 9034 CallOperator->setReferenced(); 9035 CallOperator->setUsed(); 9036} 9037 9038void Sema::DefineImplicitLambdaToFunctionPointerConversion( 9039 SourceLocation CurrentLocation, 9040 CXXConversionDecl *Conv) 9041{ 9042 CXXRecordDecl *Lambda = Conv->getParent(); 9043 9044 // Make sure that the lambda call operator is marked used. 9045 markLambdaCallOperatorUsed(*this, Lambda); 9046 9047 Conv->setUsed(); 9048 9049 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 9050 DiagnosticErrorTrap Trap(Diags); 9051 9052 // Return the address of the __invoke function. 9053 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 9054 CXXMethodDecl *Invoke 9055 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 9056 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 9057 VK_LValue, Conv->getLocation()).take(); 9058 assert(FunctionRef && "Can't refer to __invoke function?"); 9059 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 9060 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 9061 Conv->getLocation(), 9062 Conv->getLocation())); 9063 9064 // Fill in the __invoke function with a dummy implementation. IR generation 9065 // will fill in the actual details. 9066 Invoke->setUsed(); 9067 Invoke->setReferenced(); 9068 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation())); 9069 9070 if (ASTMutationListener *L = getASTMutationListener()) { 9071 L->CompletedImplicitDefinition(Conv); 9072 L->CompletedImplicitDefinition(Invoke); 9073 } 9074} 9075 9076void Sema::DefineImplicitLambdaToBlockPointerConversion( 9077 SourceLocation CurrentLocation, 9078 CXXConversionDecl *Conv) 9079{ 9080 Conv->setUsed(); 9081 9082 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 9083 DiagnosticErrorTrap Trap(Diags); 9084 9085 // Copy-initialize the lambda object as needed to capture it. 9086 Expr *This = ActOnCXXThis(CurrentLocation).take(); 9087 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 9088 9089 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 9090 Conv->getLocation(), 9091 Conv, DerefThis); 9092 9093 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 9094 // behavior. Note that only the general conversion function does this 9095 // (since it's unusable otherwise); in the case where we inline the 9096 // block literal, it has block literal lifetime semantics. 9097 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 9098 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 9099 CK_CopyAndAutoreleaseBlockObject, 9100 BuildBlock.get(), 0, VK_RValue); 9101 9102 if (BuildBlock.isInvalid()) { 9103 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9104 Conv->setInvalidDecl(); 9105 return; 9106 } 9107 9108 // Create the return statement that returns the block from the conversion 9109 // function. 9110 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 9111 if (Return.isInvalid()) { 9112 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9113 Conv->setInvalidDecl(); 9114 return; 9115 } 9116 9117 // Set the body of the conversion function. 9118 Stmt *ReturnS = Return.take(); 9119 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 9120 Conv->getLocation(), 9121 Conv->getLocation())); 9122 9123 // We're done; notify the mutation listener, if any. 9124 if (ASTMutationListener *L = getASTMutationListener()) { 9125 L->CompletedImplicitDefinition(Conv); 9126 } 9127} 9128 9129/// \brief Determine whether the given list arguments contains exactly one 9130/// "real" (non-default) argument. 9131static bool hasOneRealArgument(MultiExprArg Args) { 9132 switch (Args.size()) { 9133 case 0: 9134 return false; 9135 9136 default: 9137 if (!Args[1]->isDefaultArgument()) 9138 return false; 9139 9140 // fall through 9141 case 1: 9142 return !Args[0]->isDefaultArgument(); 9143 } 9144 9145 return false; 9146} 9147 9148ExprResult 9149Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9150 CXXConstructorDecl *Constructor, 9151 MultiExprArg ExprArgs, 9152 bool HadMultipleCandidates, 9153 bool RequiresZeroInit, 9154 unsigned ConstructKind, 9155 SourceRange ParenRange) { 9156 bool Elidable = false; 9157 9158 // C++0x [class.copy]p34: 9159 // When certain criteria are met, an implementation is allowed to 9160 // omit the copy/move construction of a class object, even if the 9161 // copy/move constructor and/or destructor for the object have 9162 // side effects. [...] 9163 // - when a temporary class object that has not been bound to a 9164 // reference (12.2) would be copied/moved to a class object 9165 // with the same cv-unqualified type, the copy/move operation 9166 // can be omitted by constructing the temporary object 9167 // directly into the target of the omitted copy/move 9168 if (ConstructKind == CXXConstructExpr::CK_Complete && 9169 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9170 Expr *SubExpr = ExprArgs[0]; 9171 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9172 } 9173 9174 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9175 Elidable, ExprArgs, HadMultipleCandidates, 9176 RequiresZeroInit, ConstructKind, ParenRange); 9177} 9178 9179/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9180/// including handling of its default argument expressions. 9181ExprResult 9182Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9183 CXXConstructorDecl *Constructor, bool Elidable, 9184 MultiExprArg ExprArgs, 9185 bool HadMultipleCandidates, 9186 bool RequiresZeroInit, 9187 unsigned ConstructKind, 9188 SourceRange ParenRange) { 9189 MarkFunctionReferenced(ConstructLoc, Constructor); 9190 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9191 Constructor, Elidable, ExprArgs, 9192 HadMultipleCandidates, /*FIXME*/false, 9193 RequiresZeroInit, 9194 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9195 ParenRange)); 9196} 9197 9198bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9199 CXXConstructorDecl *Constructor, 9200 MultiExprArg Exprs, 9201 bool HadMultipleCandidates) { 9202 // FIXME: Provide the correct paren SourceRange when available. 9203 ExprResult TempResult = 9204 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9205 Exprs, HadMultipleCandidates, false, 9206 CXXConstructExpr::CK_Complete, SourceRange()); 9207 if (TempResult.isInvalid()) 9208 return true; 9209 9210 Expr *Temp = TempResult.takeAs<Expr>(); 9211 CheckImplicitConversions(Temp, VD->getLocation()); 9212 MarkFunctionReferenced(VD->getLocation(), Constructor); 9213 Temp = MaybeCreateExprWithCleanups(Temp); 9214 VD->setInit(Temp); 9215 9216 return false; 9217} 9218 9219void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9220 if (VD->isInvalidDecl()) return; 9221 9222 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9223 if (ClassDecl->isInvalidDecl()) return; 9224 if (ClassDecl->hasIrrelevantDestructor()) return; 9225 if (ClassDecl->isDependentContext()) return; 9226 9227 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9228 MarkFunctionReferenced(VD->getLocation(), Destructor); 9229 CheckDestructorAccess(VD->getLocation(), Destructor, 9230 PDiag(diag::err_access_dtor_var) 9231 << VD->getDeclName() 9232 << VD->getType()); 9233 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9234 9235 if (!VD->hasGlobalStorage()) return; 9236 9237 // Emit warning for non-trivial dtor in global scope (a real global, 9238 // class-static, function-static). 9239 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9240 9241 // TODO: this should be re-enabled for static locals by !CXAAtExit 9242 if (!VD->isStaticLocal()) 9243 Diag(VD->getLocation(), diag::warn_global_destructor); 9244} 9245 9246/// \brief Given a constructor and the set of arguments provided for the 9247/// constructor, convert the arguments and add any required default arguments 9248/// to form a proper call to this constructor. 9249/// 9250/// \returns true if an error occurred, false otherwise. 9251bool 9252Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9253 MultiExprArg ArgsPtr, 9254 SourceLocation Loc, 9255 SmallVectorImpl<Expr*> &ConvertedArgs, 9256 bool AllowExplicit) { 9257 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9258 unsigned NumArgs = ArgsPtr.size(); 9259 Expr **Args = ArgsPtr.data(); 9260 9261 const FunctionProtoType *Proto 9262 = Constructor->getType()->getAs<FunctionProtoType>(); 9263 assert(Proto && "Constructor without a prototype?"); 9264 unsigned NumArgsInProto = Proto->getNumArgs(); 9265 9266 // If too few arguments are available, we'll fill in the rest with defaults. 9267 if (NumArgs < NumArgsInProto) 9268 ConvertedArgs.reserve(NumArgsInProto); 9269 else 9270 ConvertedArgs.reserve(NumArgs); 9271 9272 VariadicCallType CallType = 9273 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9274 SmallVector<Expr *, 8> AllArgs; 9275 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9276 Proto, 0, Args, NumArgs, AllArgs, 9277 CallType, AllowExplicit); 9278 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9279 9280 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9281 9282 CheckConstructorCall(Constructor, AllArgs.data(), AllArgs.size(), 9283 Proto, Loc); 9284 9285 return Invalid; 9286} 9287 9288static inline bool 9289CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9290 const FunctionDecl *FnDecl) { 9291 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9292 if (isa<NamespaceDecl>(DC)) { 9293 return SemaRef.Diag(FnDecl->getLocation(), 9294 diag::err_operator_new_delete_declared_in_namespace) 9295 << FnDecl->getDeclName(); 9296 } 9297 9298 if (isa<TranslationUnitDecl>(DC) && 9299 FnDecl->getStorageClass() == SC_Static) { 9300 return SemaRef.Diag(FnDecl->getLocation(), 9301 diag::err_operator_new_delete_declared_static) 9302 << FnDecl->getDeclName(); 9303 } 9304 9305 return false; 9306} 9307 9308static inline bool 9309CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9310 CanQualType ExpectedResultType, 9311 CanQualType ExpectedFirstParamType, 9312 unsigned DependentParamTypeDiag, 9313 unsigned InvalidParamTypeDiag) { 9314 QualType ResultType = 9315 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9316 9317 // Check that the result type is not dependent. 9318 if (ResultType->isDependentType()) 9319 return SemaRef.Diag(FnDecl->getLocation(), 9320 diag::err_operator_new_delete_dependent_result_type) 9321 << FnDecl->getDeclName() << ExpectedResultType; 9322 9323 // Check that the result type is what we expect. 9324 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9325 return SemaRef.Diag(FnDecl->getLocation(), 9326 diag::err_operator_new_delete_invalid_result_type) 9327 << FnDecl->getDeclName() << ExpectedResultType; 9328 9329 // A function template must have at least 2 parameters. 9330 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9331 return SemaRef.Diag(FnDecl->getLocation(), 9332 diag::err_operator_new_delete_template_too_few_parameters) 9333 << FnDecl->getDeclName(); 9334 9335 // The function decl must have at least 1 parameter. 9336 if (FnDecl->getNumParams() == 0) 9337 return SemaRef.Diag(FnDecl->getLocation(), 9338 diag::err_operator_new_delete_too_few_parameters) 9339 << FnDecl->getDeclName(); 9340 9341 // Check the first parameter type is not dependent. 9342 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9343 if (FirstParamType->isDependentType()) 9344 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9345 << FnDecl->getDeclName() << ExpectedFirstParamType; 9346 9347 // Check that the first parameter type is what we expect. 9348 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9349 ExpectedFirstParamType) 9350 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9351 << FnDecl->getDeclName() << ExpectedFirstParamType; 9352 9353 return false; 9354} 9355 9356static bool 9357CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9358 // C++ [basic.stc.dynamic.allocation]p1: 9359 // A program is ill-formed if an allocation function is declared in a 9360 // namespace scope other than global scope or declared static in global 9361 // scope. 9362 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9363 return true; 9364 9365 CanQualType SizeTy = 9366 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9367 9368 // C++ [basic.stc.dynamic.allocation]p1: 9369 // The return type shall be void*. The first parameter shall have type 9370 // std::size_t. 9371 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9372 SizeTy, 9373 diag::err_operator_new_dependent_param_type, 9374 diag::err_operator_new_param_type)) 9375 return true; 9376 9377 // C++ [basic.stc.dynamic.allocation]p1: 9378 // The first parameter shall not have an associated default argument. 9379 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9380 return SemaRef.Diag(FnDecl->getLocation(), 9381 diag::err_operator_new_default_arg) 9382 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9383 9384 return false; 9385} 9386 9387static bool 9388CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9389 // C++ [basic.stc.dynamic.deallocation]p1: 9390 // A program is ill-formed if deallocation functions are declared in a 9391 // namespace scope other than global scope or declared static in global 9392 // scope. 9393 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9394 return true; 9395 9396 // C++ [basic.stc.dynamic.deallocation]p2: 9397 // Each deallocation function shall return void and its first parameter 9398 // shall be void*. 9399 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9400 SemaRef.Context.VoidPtrTy, 9401 diag::err_operator_delete_dependent_param_type, 9402 diag::err_operator_delete_param_type)) 9403 return true; 9404 9405 return false; 9406} 9407 9408/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9409/// of this overloaded operator is well-formed. If so, returns false; 9410/// otherwise, emits appropriate diagnostics and returns true. 9411bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9412 assert(FnDecl && FnDecl->isOverloadedOperator() && 9413 "Expected an overloaded operator declaration"); 9414 9415 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9416 9417 // C++ [over.oper]p5: 9418 // The allocation and deallocation functions, operator new, 9419 // operator new[], operator delete and operator delete[], are 9420 // described completely in 3.7.3. The attributes and restrictions 9421 // found in the rest of this subclause do not apply to them unless 9422 // explicitly stated in 3.7.3. 9423 if (Op == OO_Delete || Op == OO_Array_Delete) 9424 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9425 9426 if (Op == OO_New || Op == OO_Array_New) 9427 return CheckOperatorNewDeclaration(*this, FnDecl); 9428 9429 // C++ [over.oper]p6: 9430 // An operator function shall either be a non-static member 9431 // function or be a non-member function and have at least one 9432 // parameter whose type is a class, a reference to a class, an 9433 // enumeration, or a reference to an enumeration. 9434 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9435 if (MethodDecl->isStatic()) 9436 return Diag(FnDecl->getLocation(), 9437 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9438 } else { 9439 bool ClassOrEnumParam = false; 9440 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9441 ParamEnd = FnDecl->param_end(); 9442 Param != ParamEnd; ++Param) { 9443 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9444 if (ParamType->isDependentType() || ParamType->isRecordType() || 9445 ParamType->isEnumeralType()) { 9446 ClassOrEnumParam = true; 9447 break; 9448 } 9449 } 9450 9451 if (!ClassOrEnumParam) 9452 return Diag(FnDecl->getLocation(), 9453 diag::err_operator_overload_needs_class_or_enum) 9454 << FnDecl->getDeclName(); 9455 } 9456 9457 // C++ [over.oper]p8: 9458 // An operator function cannot have default arguments (8.3.6), 9459 // except where explicitly stated below. 9460 // 9461 // Only the function-call operator allows default arguments 9462 // (C++ [over.call]p1). 9463 if (Op != OO_Call) { 9464 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9465 Param != FnDecl->param_end(); ++Param) { 9466 if ((*Param)->hasDefaultArg()) 9467 return Diag((*Param)->getLocation(), 9468 diag::err_operator_overload_default_arg) 9469 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9470 } 9471 } 9472 9473 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9474 { false, false, false } 9475#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9476 , { Unary, Binary, MemberOnly } 9477#include "clang/Basic/OperatorKinds.def" 9478 }; 9479 9480 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9481 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9482 bool MustBeMemberOperator = OperatorUses[Op][2]; 9483 9484 // C++ [over.oper]p8: 9485 // [...] Operator functions cannot have more or fewer parameters 9486 // than the number required for the corresponding operator, as 9487 // described in the rest of this subclause. 9488 unsigned NumParams = FnDecl->getNumParams() 9489 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9490 if (Op != OO_Call && 9491 ((NumParams == 1 && !CanBeUnaryOperator) || 9492 (NumParams == 2 && !CanBeBinaryOperator) || 9493 (NumParams < 1) || (NumParams > 2))) { 9494 // We have the wrong number of parameters. 9495 unsigned ErrorKind; 9496 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9497 ErrorKind = 2; // 2 -> unary or binary. 9498 } else if (CanBeUnaryOperator) { 9499 ErrorKind = 0; // 0 -> unary 9500 } else { 9501 assert(CanBeBinaryOperator && 9502 "All non-call overloaded operators are unary or binary!"); 9503 ErrorKind = 1; // 1 -> binary 9504 } 9505 9506 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9507 << FnDecl->getDeclName() << NumParams << ErrorKind; 9508 } 9509 9510 // Overloaded operators other than operator() cannot be variadic. 9511 if (Op != OO_Call && 9512 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9513 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9514 << FnDecl->getDeclName(); 9515 } 9516 9517 // Some operators must be non-static member functions. 9518 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9519 return Diag(FnDecl->getLocation(), 9520 diag::err_operator_overload_must_be_member) 9521 << FnDecl->getDeclName(); 9522 } 9523 9524 // C++ [over.inc]p1: 9525 // The user-defined function called operator++ implements the 9526 // prefix and postfix ++ operator. If this function is a member 9527 // function with no parameters, or a non-member function with one 9528 // parameter of class or enumeration type, it defines the prefix 9529 // increment operator ++ for objects of that type. If the function 9530 // is a member function with one parameter (which shall be of type 9531 // int) or a non-member function with two parameters (the second 9532 // of which shall be of type int), it defines the postfix 9533 // increment operator ++ for objects of that type. 9534 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9535 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9536 bool ParamIsInt = false; 9537 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9538 ParamIsInt = BT->getKind() == BuiltinType::Int; 9539 9540 if (!ParamIsInt) 9541 return Diag(LastParam->getLocation(), 9542 diag::err_operator_overload_post_incdec_must_be_int) 9543 << LastParam->getType() << (Op == OO_MinusMinus); 9544 } 9545 9546 return false; 9547} 9548 9549/// CheckLiteralOperatorDeclaration - Check whether the declaration 9550/// of this literal operator function is well-formed. If so, returns 9551/// false; otherwise, emits appropriate diagnostics and returns true. 9552bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9553 if (isa<CXXMethodDecl>(FnDecl)) { 9554 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9555 << FnDecl->getDeclName(); 9556 return true; 9557 } 9558 9559 if (FnDecl->isExternC()) { 9560 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 9561 return true; 9562 } 9563 9564 bool Valid = false; 9565 9566 // This might be the definition of a literal operator template. 9567 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 9568 // This might be a specialization of a literal operator template. 9569 if (!TpDecl) 9570 TpDecl = FnDecl->getPrimaryTemplate(); 9571 9572 // template <char...> type operator "" name() is the only valid template 9573 // signature, and the only valid signature with no parameters. 9574 if (TpDecl) { 9575 if (FnDecl->param_size() == 0) { 9576 // Must have only one template parameter 9577 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9578 if (Params->size() == 1) { 9579 NonTypeTemplateParmDecl *PmDecl = 9580 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9581 9582 // The template parameter must be a char parameter pack. 9583 if (PmDecl && PmDecl->isTemplateParameterPack() && 9584 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9585 Valid = true; 9586 } 9587 } 9588 } else if (FnDecl->param_size()) { 9589 // Check the first parameter 9590 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9591 9592 QualType T = (*Param)->getType().getUnqualifiedType(); 9593 9594 // unsigned long long int, long double, and any character type are allowed 9595 // as the only parameters. 9596 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9597 Context.hasSameType(T, Context.LongDoubleTy) || 9598 Context.hasSameType(T, Context.CharTy) || 9599 Context.hasSameType(T, Context.WCharTy) || 9600 Context.hasSameType(T, Context.Char16Ty) || 9601 Context.hasSameType(T, Context.Char32Ty)) { 9602 if (++Param == FnDecl->param_end()) 9603 Valid = true; 9604 goto FinishedParams; 9605 } 9606 9607 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9608 const PointerType *PT = T->getAs<PointerType>(); 9609 if (!PT) 9610 goto FinishedParams; 9611 T = PT->getPointeeType(); 9612 if (!T.isConstQualified() || T.isVolatileQualified()) 9613 goto FinishedParams; 9614 T = T.getUnqualifiedType(); 9615 9616 // Move on to the second parameter; 9617 ++Param; 9618 9619 // If there is no second parameter, the first must be a const char * 9620 if (Param == FnDecl->param_end()) { 9621 if (Context.hasSameType(T, Context.CharTy)) 9622 Valid = true; 9623 goto FinishedParams; 9624 } 9625 9626 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9627 // are allowed as the first parameter to a two-parameter function 9628 if (!(Context.hasSameType(T, Context.CharTy) || 9629 Context.hasSameType(T, Context.WCharTy) || 9630 Context.hasSameType(T, Context.Char16Ty) || 9631 Context.hasSameType(T, Context.Char32Ty))) 9632 goto FinishedParams; 9633 9634 // The second and final parameter must be an std::size_t 9635 T = (*Param)->getType().getUnqualifiedType(); 9636 if (Context.hasSameType(T, Context.getSizeType()) && 9637 ++Param == FnDecl->param_end()) 9638 Valid = true; 9639 } 9640 9641 // FIXME: This diagnostic is absolutely terrible. 9642FinishedParams: 9643 if (!Valid) { 9644 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9645 << FnDecl->getDeclName(); 9646 return true; 9647 } 9648 9649 // A parameter-declaration-clause containing a default argument is not 9650 // equivalent to any of the permitted forms. 9651 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9652 ParamEnd = FnDecl->param_end(); 9653 Param != ParamEnd; ++Param) { 9654 if ((*Param)->hasDefaultArg()) { 9655 Diag((*Param)->getDefaultArgRange().getBegin(), 9656 diag::err_literal_operator_default_argument) 9657 << (*Param)->getDefaultArgRange(); 9658 break; 9659 } 9660 } 9661 9662 StringRef LiteralName 9663 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9664 if (LiteralName[0] != '_') { 9665 // C++11 [usrlit.suffix]p1: 9666 // Literal suffix identifiers that do not start with an underscore 9667 // are reserved for future standardization. 9668 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9669 } 9670 9671 return false; 9672} 9673 9674/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9675/// linkage specification, including the language and (if present) 9676/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9677/// the location of the language string literal, which is provided 9678/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9679/// the '{' brace. Otherwise, this linkage specification does not 9680/// have any braces. 9681Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9682 SourceLocation LangLoc, 9683 StringRef Lang, 9684 SourceLocation LBraceLoc) { 9685 LinkageSpecDecl::LanguageIDs Language; 9686 if (Lang == "\"C\"") 9687 Language = LinkageSpecDecl::lang_c; 9688 else if (Lang == "\"C++\"") 9689 Language = LinkageSpecDecl::lang_cxx; 9690 else { 9691 Diag(LangLoc, diag::err_bad_language); 9692 return 0; 9693 } 9694 9695 // FIXME: Add all the various semantics of linkage specifications 9696 9697 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9698 ExternLoc, LangLoc, Language); 9699 CurContext->addDecl(D); 9700 PushDeclContext(S, D); 9701 return D; 9702} 9703 9704/// ActOnFinishLinkageSpecification - Complete the definition of 9705/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9706/// valid, it's the position of the closing '}' brace in a linkage 9707/// specification that uses braces. 9708Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9709 Decl *LinkageSpec, 9710 SourceLocation RBraceLoc) { 9711 if (LinkageSpec) { 9712 if (RBraceLoc.isValid()) { 9713 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9714 LSDecl->setRBraceLoc(RBraceLoc); 9715 } 9716 PopDeclContext(); 9717 } 9718 return LinkageSpec; 9719} 9720 9721/// \brief Perform semantic analysis for the variable declaration that 9722/// occurs within a C++ catch clause, returning the newly-created 9723/// variable. 9724VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9725 TypeSourceInfo *TInfo, 9726 SourceLocation StartLoc, 9727 SourceLocation Loc, 9728 IdentifierInfo *Name) { 9729 bool Invalid = false; 9730 QualType ExDeclType = TInfo->getType(); 9731 9732 // Arrays and functions decay. 9733 if (ExDeclType->isArrayType()) 9734 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9735 else if (ExDeclType->isFunctionType()) 9736 ExDeclType = Context.getPointerType(ExDeclType); 9737 9738 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9739 // The exception-declaration shall not denote a pointer or reference to an 9740 // incomplete type, other than [cv] void*. 9741 // N2844 forbids rvalue references. 9742 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9743 Diag(Loc, diag::err_catch_rvalue_ref); 9744 Invalid = true; 9745 } 9746 9747 QualType BaseType = ExDeclType; 9748 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9749 unsigned DK = diag::err_catch_incomplete; 9750 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9751 BaseType = Ptr->getPointeeType(); 9752 Mode = 1; 9753 DK = diag::err_catch_incomplete_ptr; 9754 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9755 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9756 BaseType = Ref->getPointeeType(); 9757 Mode = 2; 9758 DK = diag::err_catch_incomplete_ref; 9759 } 9760 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9761 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9762 Invalid = true; 9763 9764 if (!Invalid && !ExDeclType->isDependentType() && 9765 RequireNonAbstractType(Loc, ExDeclType, 9766 diag::err_abstract_type_in_decl, 9767 AbstractVariableType)) 9768 Invalid = true; 9769 9770 // Only the non-fragile NeXT runtime currently supports C++ catches 9771 // of ObjC types, and no runtime supports catching ObjC types by value. 9772 if (!Invalid && getLangOpts().ObjC1) { 9773 QualType T = ExDeclType; 9774 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9775 T = RT->getPointeeType(); 9776 9777 if (T->isObjCObjectType()) { 9778 Diag(Loc, diag::err_objc_object_catch); 9779 Invalid = true; 9780 } else if (T->isObjCObjectPointerType()) { 9781 // FIXME: should this be a test for macosx-fragile specifically? 9782 if (getLangOpts().ObjCRuntime.isFragile()) 9783 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9784 } 9785 } 9786 9787 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9788 ExDeclType, TInfo, SC_None, SC_None); 9789 ExDecl->setExceptionVariable(true); 9790 9791 // In ARC, infer 'retaining' for variables of retainable type. 9792 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9793 Invalid = true; 9794 9795 if (!Invalid && !ExDeclType->isDependentType()) { 9796 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9797 // C++ [except.handle]p16: 9798 // The object declared in an exception-declaration or, if the 9799 // exception-declaration does not specify a name, a temporary (12.2) is 9800 // copy-initialized (8.5) from the exception object. [...] 9801 // The object is destroyed when the handler exits, after the destruction 9802 // of any automatic objects initialized within the handler. 9803 // 9804 // We just pretend to initialize the object with itself, then make sure 9805 // it can be destroyed later. 9806 QualType initType = ExDeclType; 9807 9808 InitializedEntity entity = 9809 InitializedEntity::InitializeVariable(ExDecl); 9810 InitializationKind initKind = 9811 InitializationKind::CreateCopy(Loc, SourceLocation()); 9812 9813 Expr *opaqueValue = 9814 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9815 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9816 ExprResult result = sequence.Perform(*this, entity, initKind, 9817 MultiExprArg(&opaqueValue, 1)); 9818 if (result.isInvalid()) 9819 Invalid = true; 9820 else { 9821 // If the constructor used was non-trivial, set this as the 9822 // "initializer". 9823 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9824 if (!construct->getConstructor()->isTrivial()) { 9825 Expr *init = MaybeCreateExprWithCleanups(construct); 9826 ExDecl->setInit(init); 9827 } 9828 9829 // And make sure it's destructable. 9830 FinalizeVarWithDestructor(ExDecl, recordType); 9831 } 9832 } 9833 } 9834 9835 if (Invalid) 9836 ExDecl->setInvalidDecl(); 9837 9838 return ExDecl; 9839} 9840 9841/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9842/// handler. 9843Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9844 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9845 bool Invalid = D.isInvalidType(); 9846 9847 // Check for unexpanded parameter packs. 9848 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9849 UPPC_ExceptionType)) { 9850 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9851 D.getIdentifierLoc()); 9852 Invalid = true; 9853 } 9854 9855 IdentifierInfo *II = D.getIdentifier(); 9856 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9857 LookupOrdinaryName, 9858 ForRedeclaration)) { 9859 // The scope should be freshly made just for us. There is just no way 9860 // it contains any previous declaration. 9861 assert(!S->isDeclScope(PrevDecl)); 9862 if (PrevDecl->isTemplateParameter()) { 9863 // Maybe we will complain about the shadowed template parameter. 9864 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9865 PrevDecl = 0; 9866 } 9867 } 9868 9869 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9870 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9871 << D.getCXXScopeSpec().getRange(); 9872 Invalid = true; 9873 } 9874 9875 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9876 D.getLocStart(), 9877 D.getIdentifierLoc(), 9878 D.getIdentifier()); 9879 if (Invalid) 9880 ExDecl->setInvalidDecl(); 9881 9882 // Add the exception declaration into this scope. 9883 if (II) 9884 PushOnScopeChains(ExDecl, S); 9885 else 9886 CurContext->addDecl(ExDecl); 9887 9888 ProcessDeclAttributes(S, ExDecl, D); 9889 return ExDecl; 9890} 9891 9892Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9893 Expr *AssertExpr, 9894 Expr *AssertMessageExpr, 9895 SourceLocation RParenLoc) { 9896 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 9897 9898 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9899 return 0; 9900 9901 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 9902 AssertMessage, RParenLoc, false); 9903} 9904 9905Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9906 Expr *AssertExpr, 9907 StringLiteral *AssertMessage, 9908 SourceLocation RParenLoc, 9909 bool Failed) { 9910 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 9911 !Failed) { 9912 // In a static_assert-declaration, the constant-expression shall be a 9913 // constant expression that can be contextually converted to bool. 9914 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9915 if (Converted.isInvalid()) 9916 Failed = true; 9917 9918 llvm::APSInt Cond; 9919 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 9920 diag::err_static_assert_expression_is_not_constant, 9921 /*AllowFold=*/false).isInvalid()) 9922 Failed = true; 9923 9924 if (!Failed && !Cond) { 9925 llvm::SmallString<256> MsgBuffer; 9926 llvm::raw_svector_ostream Msg(MsgBuffer); 9927 AssertMessage->printPretty(Msg, 0, getPrintingPolicy()); 9928 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9929 << Msg.str() << AssertExpr->getSourceRange(); 9930 Failed = true; 9931 } 9932 } 9933 9934 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9935 AssertExpr, AssertMessage, RParenLoc, 9936 Failed); 9937 9938 CurContext->addDecl(Decl); 9939 return Decl; 9940} 9941 9942/// \brief Perform semantic analysis of the given friend type declaration. 9943/// 9944/// \returns A friend declaration that. 9945FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart, 9946 SourceLocation FriendLoc, 9947 TypeSourceInfo *TSInfo) { 9948 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9949 9950 QualType T = TSInfo->getType(); 9951 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9952 9953 // C++03 [class.friend]p2: 9954 // An elaborated-type-specifier shall be used in a friend declaration 9955 // for a class.* 9956 // 9957 // * The class-key of the elaborated-type-specifier is required. 9958 if (!ActiveTemplateInstantiations.empty()) { 9959 // Do not complain about the form of friend template types during 9960 // template instantiation; we will already have complained when the 9961 // template was declared. 9962 } else if (!T->isElaboratedTypeSpecifier()) { 9963 // If we evaluated the type to a record type, suggest putting 9964 // a tag in front. 9965 if (const RecordType *RT = T->getAs<RecordType>()) { 9966 RecordDecl *RD = RT->getDecl(); 9967 9968 std::string InsertionText = std::string(" ") + RD->getKindName(); 9969 9970 Diag(TypeRange.getBegin(), 9971 getLangOpts().CPlusPlus0x ? 9972 diag::warn_cxx98_compat_unelaborated_friend_type : 9973 diag::ext_unelaborated_friend_type) 9974 << (unsigned) RD->getTagKind() 9975 << T 9976 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9977 InsertionText); 9978 } else { 9979 Diag(FriendLoc, 9980 getLangOpts().CPlusPlus0x ? 9981 diag::warn_cxx98_compat_nonclass_type_friend : 9982 diag::ext_nonclass_type_friend) 9983 << T 9984 << TypeRange; 9985 } 9986 } else if (T->getAs<EnumType>()) { 9987 Diag(FriendLoc, 9988 getLangOpts().CPlusPlus0x ? 9989 diag::warn_cxx98_compat_enum_friend : 9990 diag::ext_enum_friend) 9991 << T 9992 << TypeRange; 9993 } 9994 9995 // C++11 [class.friend]p3: 9996 // A friend declaration that does not declare a function shall have one 9997 // of the following forms: 9998 // friend elaborated-type-specifier ; 9999 // friend simple-type-specifier ; 10000 // friend typename-specifier ; 10001 if (getLangOpts().CPlusPlus0x && LocStart != FriendLoc) 10002 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T; 10003 10004 // If the type specifier in a friend declaration designates a (possibly 10005 // cv-qualified) class type, that class is declared as a friend; otherwise, 10006 // the friend declaration is ignored. 10007 return FriendDecl::Create(Context, CurContext, LocStart, TSInfo, FriendLoc); 10008} 10009 10010/// Handle a friend tag declaration where the scope specifier was 10011/// templated. 10012Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 10013 unsigned TagSpec, SourceLocation TagLoc, 10014 CXXScopeSpec &SS, 10015 IdentifierInfo *Name, SourceLocation NameLoc, 10016 AttributeList *Attr, 10017 MultiTemplateParamsArg TempParamLists) { 10018 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 10019 10020 bool isExplicitSpecialization = false; 10021 bool Invalid = false; 10022 10023 if (TemplateParameterList *TemplateParams 10024 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 10025 TempParamLists.data(), 10026 TempParamLists.size(), 10027 /*friend*/ true, 10028 isExplicitSpecialization, 10029 Invalid)) { 10030 if (TemplateParams->size() > 0) { 10031 // This is a declaration of a class template. 10032 if (Invalid) 10033 return 0; 10034 10035 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 10036 SS, Name, NameLoc, Attr, 10037 TemplateParams, AS_public, 10038 /*ModulePrivateLoc=*/SourceLocation(), 10039 TempParamLists.size() - 1, 10040 TempParamLists.data()).take(); 10041 } else { 10042 // The "template<>" header is extraneous. 10043 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 10044 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 10045 isExplicitSpecialization = true; 10046 } 10047 } 10048 10049 if (Invalid) return 0; 10050 10051 bool isAllExplicitSpecializations = true; 10052 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 10053 if (TempParamLists[I]->size()) { 10054 isAllExplicitSpecializations = false; 10055 break; 10056 } 10057 } 10058 10059 // FIXME: don't ignore attributes. 10060 10061 // If it's explicit specializations all the way down, just forget 10062 // about the template header and build an appropriate non-templated 10063 // friend. TODO: for source fidelity, remember the headers. 10064 if (isAllExplicitSpecializations) { 10065 if (SS.isEmpty()) { 10066 bool Owned = false; 10067 bool IsDependent = false; 10068 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 10069 Attr, AS_public, 10070 /*ModulePrivateLoc=*/SourceLocation(), 10071 MultiTemplateParamsArg(), Owned, IsDependent, 10072 /*ScopedEnumKWLoc=*/SourceLocation(), 10073 /*ScopedEnumUsesClassTag=*/false, 10074 /*UnderlyingType=*/TypeResult()); 10075 } 10076 10077 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 10078 ElaboratedTypeKeyword Keyword 10079 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10080 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 10081 *Name, NameLoc); 10082 if (T.isNull()) 10083 return 0; 10084 10085 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10086 if (isa<DependentNameType>(T)) { 10087 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10088 TL.setElaboratedKeywordLoc(TagLoc); 10089 TL.setQualifierLoc(QualifierLoc); 10090 TL.setNameLoc(NameLoc); 10091 } else { 10092 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 10093 TL.setElaboratedKeywordLoc(TagLoc); 10094 TL.setQualifierLoc(QualifierLoc); 10095 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 10096 } 10097 10098 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10099 TSI, FriendLoc); 10100 Friend->setAccess(AS_public); 10101 CurContext->addDecl(Friend); 10102 return Friend; 10103 } 10104 10105 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 10106 10107 10108 10109 // Handle the case of a templated-scope friend class. e.g. 10110 // template <class T> class A<T>::B; 10111 // FIXME: we don't support these right now. 10112 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10113 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10114 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10115 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10116 TL.setElaboratedKeywordLoc(TagLoc); 10117 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10118 TL.setNameLoc(NameLoc); 10119 10120 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10121 TSI, FriendLoc); 10122 Friend->setAccess(AS_public); 10123 Friend->setUnsupportedFriend(true); 10124 CurContext->addDecl(Friend); 10125 return Friend; 10126} 10127 10128 10129/// Handle a friend type declaration. This works in tandem with 10130/// ActOnTag. 10131/// 10132/// Notes on friend class templates: 10133/// 10134/// We generally treat friend class declarations as if they were 10135/// declaring a class. So, for example, the elaborated type specifier 10136/// in a friend declaration is required to obey the restrictions of a 10137/// class-head (i.e. no typedefs in the scope chain), template 10138/// parameters are required to match up with simple template-ids, &c. 10139/// However, unlike when declaring a template specialization, it's 10140/// okay to refer to a template specialization without an empty 10141/// template parameter declaration, e.g. 10142/// friend class A<T>::B<unsigned>; 10143/// We permit this as a special case; if there are any template 10144/// parameters present at all, require proper matching, i.e. 10145/// template <> template \<class T> friend class A<int>::B; 10146Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10147 MultiTemplateParamsArg TempParams) { 10148 SourceLocation Loc = DS.getLocStart(); 10149 10150 assert(DS.isFriendSpecified()); 10151 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10152 10153 // Try to convert the decl specifier to a type. This works for 10154 // friend templates because ActOnTag never produces a ClassTemplateDecl 10155 // for a TUK_Friend. 10156 Declarator TheDeclarator(DS, Declarator::MemberContext); 10157 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10158 QualType T = TSI->getType(); 10159 if (TheDeclarator.isInvalidType()) 10160 return 0; 10161 10162 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10163 return 0; 10164 10165 // This is definitely an error in C++98. It's probably meant to 10166 // be forbidden in C++0x, too, but the specification is just 10167 // poorly written. 10168 // 10169 // The problem is with declarations like the following: 10170 // template <T> friend A<T>::foo; 10171 // where deciding whether a class C is a friend or not now hinges 10172 // on whether there exists an instantiation of A that causes 10173 // 'foo' to equal C. There are restrictions on class-heads 10174 // (which we declare (by fiat) elaborated friend declarations to 10175 // be) that makes this tractable. 10176 // 10177 // FIXME: handle "template <> friend class A<T>;", which 10178 // is possibly well-formed? Who even knows? 10179 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10180 Diag(Loc, diag::err_tagless_friend_type_template) 10181 << DS.getSourceRange(); 10182 return 0; 10183 } 10184 10185 // C++98 [class.friend]p1: A friend of a class is a function 10186 // or class that is not a member of the class . . . 10187 // This is fixed in DR77, which just barely didn't make the C++03 10188 // deadline. It's also a very silly restriction that seriously 10189 // affects inner classes and which nobody else seems to implement; 10190 // thus we never diagnose it, not even in -pedantic. 10191 // 10192 // But note that we could warn about it: it's always useless to 10193 // friend one of your own members (it's not, however, worthless to 10194 // friend a member of an arbitrary specialization of your template). 10195 10196 Decl *D; 10197 if (unsigned NumTempParamLists = TempParams.size()) 10198 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10199 NumTempParamLists, 10200 TempParams.data(), 10201 TSI, 10202 DS.getFriendSpecLoc()); 10203 else 10204 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10205 10206 if (!D) 10207 return 0; 10208 10209 D->setAccess(AS_public); 10210 CurContext->addDecl(D); 10211 10212 return D; 10213} 10214 10215Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10216 MultiTemplateParamsArg TemplateParams) { 10217 const DeclSpec &DS = D.getDeclSpec(); 10218 10219 assert(DS.isFriendSpecified()); 10220 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10221 10222 SourceLocation Loc = D.getIdentifierLoc(); 10223 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10224 10225 // C++ [class.friend]p1 10226 // A friend of a class is a function or class.... 10227 // Note that this sees through typedefs, which is intended. 10228 // It *doesn't* see through dependent types, which is correct 10229 // according to [temp.arg.type]p3: 10230 // If a declaration acquires a function type through a 10231 // type dependent on a template-parameter and this causes 10232 // a declaration that does not use the syntactic form of a 10233 // function declarator to have a function type, the program 10234 // is ill-formed. 10235 if (!TInfo->getType()->isFunctionType()) { 10236 Diag(Loc, diag::err_unexpected_friend); 10237 10238 // It might be worthwhile to try to recover by creating an 10239 // appropriate declaration. 10240 return 0; 10241 } 10242 10243 // C++ [namespace.memdef]p3 10244 // - If a friend declaration in a non-local class first declares a 10245 // class or function, the friend class or function is a member 10246 // of the innermost enclosing namespace. 10247 // - The name of the friend is not found by simple name lookup 10248 // until a matching declaration is provided in that namespace 10249 // scope (either before or after the class declaration granting 10250 // friendship). 10251 // - If a friend function is called, its name may be found by the 10252 // name lookup that considers functions from namespaces and 10253 // classes associated with the types of the function arguments. 10254 // - When looking for a prior declaration of a class or a function 10255 // declared as a friend, scopes outside the innermost enclosing 10256 // namespace scope are not considered. 10257 10258 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10259 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10260 DeclarationName Name = NameInfo.getName(); 10261 assert(Name); 10262 10263 // Check for unexpanded parameter packs. 10264 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10265 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10266 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10267 return 0; 10268 10269 // The context we found the declaration in, or in which we should 10270 // create the declaration. 10271 DeclContext *DC; 10272 Scope *DCScope = S; 10273 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10274 ForRedeclaration); 10275 10276 // FIXME: there are different rules in local classes 10277 10278 // There are four cases here. 10279 // - There's no scope specifier, in which case we just go to the 10280 // appropriate scope and look for a function or function template 10281 // there as appropriate. 10282 // Recover from invalid scope qualifiers as if they just weren't there. 10283 if (SS.isInvalid() || !SS.isSet()) { 10284 // C++0x [namespace.memdef]p3: 10285 // If the name in a friend declaration is neither qualified nor 10286 // a template-id and the declaration is a function or an 10287 // elaborated-type-specifier, the lookup to determine whether 10288 // the entity has been previously declared shall not consider 10289 // any scopes outside the innermost enclosing namespace. 10290 // C++0x [class.friend]p11: 10291 // If a friend declaration appears in a local class and the name 10292 // specified is an unqualified name, a prior declaration is 10293 // looked up without considering scopes that are outside the 10294 // innermost enclosing non-class scope. For a friend function 10295 // declaration, if there is no prior declaration, the program is 10296 // ill-formed. 10297 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10298 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10299 10300 // Find the appropriate context according to the above. 10301 DC = CurContext; 10302 while (true) { 10303 // Skip class contexts. If someone can cite chapter and verse 10304 // for this behavior, that would be nice --- it's what GCC and 10305 // EDG do, and it seems like a reasonable intent, but the spec 10306 // really only says that checks for unqualified existing 10307 // declarations should stop at the nearest enclosing namespace, 10308 // not that they should only consider the nearest enclosing 10309 // namespace. 10310 while (DC->isRecord() || DC->isTransparentContext()) 10311 DC = DC->getParent(); 10312 10313 LookupQualifiedName(Previous, DC); 10314 10315 // TODO: decide what we think about using declarations. 10316 if (isLocal || !Previous.empty()) 10317 break; 10318 10319 if (isTemplateId) { 10320 if (isa<TranslationUnitDecl>(DC)) break; 10321 } else { 10322 if (DC->isFileContext()) break; 10323 } 10324 DC = DC->getParent(); 10325 } 10326 10327 // C++ [class.friend]p1: A friend of a class is a function or 10328 // class that is not a member of the class . . . 10329 // C++11 changes this for both friend types and functions. 10330 // Most C++ 98 compilers do seem to give an error here, so 10331 // we do, too. 10332 if (!Previous.empty() && DC->Equals(CurContext)) 10333 Diag(DS.getFriendSpecLoc(), 10334 getLangOpts().CPlusPlus0x ? 10335 diag::warn_cxx98_compat_friend_is_member : 10336 diag::err_friend_is_member); 10337 10338 DCScope = getScopeForDeclContext(S, DC); 10339 10340 // C++ [class.friend]p6: 10341 // A function can be defined in a friend declaration of a class if and 10342 // only if the class is a non-local class (9.8), the function name is 10343 // unqualified, and the function has namespace scope. 10344 if (isLocal && D.isFunctionDefinition()) { 10345 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10346 } 10347 10348 // - There's a non-dependent scope specifier, in which case we 10349 // compute it and do a previous lookup there for a function 10350 // or function template. 10351 } else if (!SS.getScopeRep()->isDependent()) { 10352 DC = computeDeclContext(SS); 10353 if (!DC) return 0; 10354 10355 if (RequireCompleteDeclContext(SS, DC)) return 0; 10356 10357 LookupQualifiedName(Previous, DC); 10358 10359 // Ignore things found implicitly in the wrong scope. 10360 // TODO: better diagnostics for this case. Suggesting the right 10361 // qualified scope would be nice... 10362 LookupResult::Filter F = Previous.makeFilter(); 10363 while (F.hasNext()) { 10364 NamedDecl *D = F.next(); 10365 if (!DC->InEnclosingNamespaceSetOf( 10366 D->getDeclContext()->getRedeclContext())) 10367 F.erase(); 10368 } 10369 F.done(); 10370 10371 if (Previous.empty()) { 10372 D.setInvalidType(); 10373 Diag(Loc, diag::err_qualified_friend_not_found) 10374 << Name << TInfo->getType(); 10375 return 0; 10376 } 10377 10378 // C++ [class.friend]p1: A friend of a class is a function or 10379 // class that is not a member of the class . . . 10380 if (DC->Equals(CurContext)) 10381 Diag(DS.getFriendSpecLoc(), 10382 getLangOpts().CPlusPlus0x ? 10383 diag::warn_cxx98_compat_friend_is_member : 10384 diag::err_friend_is_member); 10385 10386 if (D.isFunctionDefinition()) { 10387 // C++ [class.friend]p6: 10388 // A function can be defined in a friend declaration of a class if and 10389 // only if the class is a non-local class (9.8), the function name is 10390 // unqualified, and the function has namespace scope. 10391 SemaDiagnosticBuilder DB 10392 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10393 10394 DB << SS.getScopeRep(); 10395 if (DC->isFileContext()) 10396 DB << FixItHint::CreateRemoval(SS.getRange()); 10397 SS.clear(); 10398 } 10399 10400 // - There's a scope specifier that does not match any template 10401 // parameter lists, in which case we use some arbitrary context, 10402 // create a method or method template, and wait for instantiation. 10403 // - There's a scope specifier that does match some template 10404 // parameter lists, which we don't handle right now. 10405 } else { 10406 if (D.isFunctionDefinition()) { 10407 // C++ [class.friend]p6: 10408 // A function can be defined in a friend declaration of a class if and 10409 // only if the class is a non-local class (9.8), the function name is 10410 // unqualified, and the function has namespace scope. 10411 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10412 << SS.getScopeRep(); 10413 } 10414 10415 DC = CurContext; 10416 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10417 } 10418 10419 if (!DC->isRecord()) { 10420 // This implies that it has to be an operator or function. 10421 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10422 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10423 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10424 Diag(Loc, diag::err_introducing_special_friend) << 10425 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10426 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10427 return 0; 10428 } 10429 } 10430 10431 // FIXME: This is an egregious hack to cope with cases where the scope stack 10432 // does not contain the declaration context, i.e., in an out-of-line 10433 // definition of a class. 10434 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10435 if (!DCScope) { 10436 FakeDCScope.setEntity(DC); 10437 DCScope = &FakeDCScope; 10438 } 10439 10440 bool AddToScope = true; 10441 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10442 TemplateParams, AddToScope); 10443 if (!ND) return 0; 10444 10445 assert(ND->getDeclContext() == DC); 10446 assert(ND->getLexicalDeclContext() == CurContext); 10447 10448 // Add the function declaration to the appropriate lookup tables, 10449 // adjusting the redeclarations list as necessary. We don't 10450 // want to do this yet if the friending class is dependent. 10451 // 10452 // Also update the scope-based lookup if the target context's 10453 // lookup context is in lexical scope. 10454 if (!CurContext->isDependentContext()) { 10455 DC = DC->getRedeclContext(); 10456 DC->makeDeclVisibleInContext(ND); 10457 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10458 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10459 } 10460 10461 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10462 D.getIdentifierLoc(), ND, 10463 DS.getFriendSpecLoc()); 10464 FrD->setAccess(AS_public); 10465 CurContext->addDecl(FrD); 10466 10467 if (ND->isInvalidDecl()) { 10468 FrD->setInvalidDecl(); 10469 } else { 10470 if (DC->isRecord()) CheckFriendAccess(ND); 10471 10472 FunctionDecl *FD; 10473 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10474 FD = FTD->getTemplatedDecl(); 10475 else 10476 FD = cast<FunctionDecl>(ND); 10477 10478 // Mark templated-scope function declarations as unsupported. 10479 if (FD->getNumTemplateParameterLists()) 10480 FrD->setUnsupportedFriend(true); 10481 } 10482 10483 return ND; 10484} 10485 10486void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10487 AdjustDeclIfTemplate(Dcl); 10488 10489 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10490 if (!Fn) { 10491 Diag(DelLoc, diag::err_deleted_non_function); 10492 return; 10493 } 10494 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10495 // Don't consider the implicit declaration we generate for explicit 10496 // specializations. FIXME: Do not generate these implicit declarations. 10497 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 10498 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 10499 Diag(DelLoc, diag::err_deleted_decl_not_first); 10500 Diag(Prev->getLocation(), diag::note_previous_declaration); 10501 } 10502 // If the declaration wasn't the first, we delete the function anyway for 10503 // recovery. 10504 } 10505 Fn->setDeletedAsWritten(); 10506 10507 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10508 if (!MD) 10509 return; 10510 10511 // A deleted special member function is trivial if the corresponding 10512 // implicitly-declared function would have been. 10513 switch (getSpecialMember(MD)) { 10514 case CXXInvalid: 10515 break; 10516 case CXXDefaultConstructor: 10517 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor()); 10518 break; 10519 case CXXCopyConstructor: 10520 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor()); 10521 break; 10522 case CXXMoveConstructor: 10523 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor()); 10524 break; 10525 case CXXCopyAssignment: 10526 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 10527 break; 10528 case CXXMoveAssignment: 10529 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 10530 break; 10531 case CXXDestructor: 10532 MD->setTrivial(MD->getParent()->hasTrivialDestructor()); 10533 break; 10534 } 10535} 10536 10537void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10538 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10539 10540 if (MD) { 10541 if (MD->getParent()->isDependentType()) { 10542 MD->setDefaulted(); 10543 MD->setExplicitlyDefaulted(); 10544 return; 10545 } 10546 10547 CXXSpecialMember Member = getSpecialMember(MD); 10548 if (Member == CXXInvalid) { 10549 Diag(DefaultLoc, diag::err_default_special_members); 10550 return; 10551 } 10552 10553 MD->setDefaulted(); 10554 MD->setExplicitlyDefaulted(); 10555 10556 // If this definition appears within the record, do the checking when 10557 // the record is complete. 10558 const FunctionDecl *Primary = MD; 10559 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern()) 10560 // Find the uninstantiated declaration that actually had the '= default' 10561 // on it. 10562 Pattern->isDefined(Primary); 10563 10564 if (Primary == Primary->getCanonicalDecl()) 10565 return; 10566 10567 CheckExplicitlyDefaultedSpecialMember(MD); 10568 10569 switch (Member) { 10570 case CXXDefaultConstructor: { 10571 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10572 if (!CD->isInvalidDecl()) 10573 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10574 break; 10575 } 10576 10577 case CXXCopyConstructor: { 10578 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10579 if (!CD->isInvalidDecl()) 10580 DefineImplicitCopyConstructor(DefaultLoc, CD); 10581 break; 10582 } 10583 10584 case CXXCopyAssignment: { 10585 if (!MD->isInvalidDecl()) 10586 DefineImplicitCopyAssignment(DefaultLoc, MD); 10587 break; 10588 } 10589 10590 case CXXDestructor: { 10591 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10592 if (!DD->isInvalidDecl()) 10593 DefineImplicitDestructor(DefaultLoc, DD); 10594 break; 10595 } 10596 10597 case CXXMoveConstructor: { 10598 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10599 if (!CD->isInvalidDecl()) 10600 DefineImplicitMoveConstructor(DefaultLoc, CD); 10601 break; 10602 } 10603 10604 case CXXMoveAssignment: { 10605 if (!MD->isInvalidDecl()) 10606 DefineImplicitMoveAssignment(DefaultLoc, MD); 10607 break; 10608 } 10609 10610 case CXXInvalid: 10611 llvm_unreachable("Invalid special member."); 10612 } 10613 } else { 10614 Diag(DefaultLoc, diag::err_default_special_members); 10615 } 10616} 10617 10618static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10619 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10620 Stmt *SubStmt = *CI; 10621 if (!SubStmt) 10622 continue; 10623 if (isa<ReturnStmt>(SubStmt)) 10624 Self.Diag(SubStmt->getLocStart(), 10625 diag::err_return_in_constructor_handler); 10626 if (!isa<Expr>(SubStmt)) 10627 SearchForReturnInStmt(Self, SubStmt); 10628 } 10629} 10630 10631void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10632 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10633 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10634 SearchForReturnInStmt(*this, Handler); 10635 } 10636} 10637 10638bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10639 const CXXMethodDecl *Old) { 10640 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10641 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10642 10643 if (Context.hasSameType(NewTy, OldTy) || 10644 NewTy->isDependentType() || OldTy->isDependentType()) 10645 return false; 10646 10647 // Check if the return types are covariant 10648 QualType NewClassTy, OldClassTy; 10649 10650 /// Both types must be pointers or references to classes. 10651 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10652 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10653 NewClassTy = NewPT->getPointeeType(); 10654 OldClassTy = OldPT->getPointeeType(); 10655 } 10656 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10657 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10658 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10659 NewClassTy = NewRT->getPointeeType(); 10660 OldClassTy = OldRT->getPointeeType(); 10661 } 10662 } 10663 } 10664 10665 // The return types aren't either both pointers or references to a class type. 10666 if (NewClassTy.isNull()) { 10667 Diag(New->getLocation(), 10668 diag::err_different_return_type_for_overriding_virtual_function) 10669 << New->getDeclName() << NewTy << OldTy; 10670 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10671 10672 return true; 10673 } 10674 10675 // C++ [class.virtual]p6: 10676 // If the return type of D::f differs from the return type of B::f, the 10677 // class type in the return type of D::f shall be complete at the point of 10678 // declaration of D::f or shall be the class type D. 10679 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10680 if (!RT->isBeingDefined() && 10681 RequireCompleteType(New->getLocation(), NewClassTy, 10682 diag::err_covariant_return_incomplete, 10683 New->getDeclName())) 10684 return true; 10685 } 10686 10687 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10688 // Check if the new class derives from the old class. 10689 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10690 Diag(New->getLocation(), 10691 diag::err_covariant_return_not_derived) 10692 << New->getDeclName() << NewTy << OldTy; 10693 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10694 return true; 10695 } 10696 10697 // Check if we the conversion from derived to base is valid. 10698 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10699 diag::err_covariant_return_inaccessible_base, 10700 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10701 // FIXME: Should this point to the return type? 10702 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10703 // FIXME: this note won't trigger for delayed access control 10704 // diagnostics, and it's impossible to get an undelayed error 10705 // here from access control during the original parse because 10706 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10707 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10708 return true; 10709 } 10710 } 10711 10712 // The qualifiers of the return types must be the same. 10713 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10714 Diag(New->getLocation(), 10715 diag::err_covariant_return_type_different_qualifications) 10716 << New->getDeclName() << NewTy << OldTy; 10717 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10718 return true; 10719 }; 10720 10721 10722 // The new class type must have the same or less qualifiers as the old type. 10723 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10724 Diag(New->getLocation(), 10725 diag::err_covariant_return_type_class_type_more_qualified) 10726 << New->getDeclName() << NewTy << OldTy; 10727 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10728 return true; 10729 }; 10730 10731 return false; 10732} 10733 10734/// \brief Mark the given method pure. 10735/// 10736/// \param Method the method to be marked pure. 10737/// 10738/// \param InitRange the source range that covers the "0" initializer. 10739bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10740 SourceLocation EndLoc = InitRange.getEnd(); 10741 if (EndLoc.isValid()) 10742 Method->setRangeEnd(EndLoc); 10743 10744 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10745 Method->setPure(); 10746 return false; 10747 } 10748 10749 if (!Method->isInvalidDecl()) 10750 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10751 << Method->getDeclName() << InitRange; 10752 return true; 10753} 10754 10755/// \brief Determine whether the given declaration is a static data member. 10756static bool isStaticDataMember(Decl *D) { 10757 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10758 if (!Var) 10759 return false; 10760 10761 return Var->isStaticDataMember(); 10762} 10763/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10764/// an initializer for the out-of-line declaration 'Dcl'. The scope 10765/// is a fresh scope pushed for just this purpose. 10766/// 10767/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10768/// static data member of class X, names should be looked up in the scope of 10769/// class X. 10770void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10771 // If there is no declaration, there was an error parsing it. 10772 if (D == 0 || D->isInvalidDecl()) return; 10773 10774 // We should only get called for declarations with scope specifiers, like: 10775 // int foo::bar; 10776 assert(D->isOutOfLine()); 10777 EnterDeclaratorContext(S, D->getDeclContext()); 10778 10779 // If we are parsing the initializer for a static data member, push a 10780 // new expression evaluation context that is associated with this static 10781 // data member. 10782 if (isStaticDataMember(D)) 10783 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10784} 10785 10786/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10787/// initializer for the out-of-line declaration 'D'. 10788void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10789 // If there is no declaration, there was an error parsing it. 10790 if (D == 0 || D->isInvalidDecl()) return; 10791 10792 if (isStaticDataMember(D)) 10793 PopExpressionEvaluationContext(); 10794 10795 assert(D->isOutOfLine()); 10796 ExitDeclaratorContext(S); 10797} 10798 10799/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10800/// C++ if/switch/while/for statement. 10801/// e.g: "if (int x = f()) {...}" 10802DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10803 // C++ 6.4p2: 10804 // The declarator shall not specify a function or an array. 10805 // The type-specifier-seq shall not contain typedef and shall not declare a 10806 // new class or enumeration. 10807 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10808 "Parser allowed 'typedef' as storage class of condition decl."); 10809 10810 Decl *Dcl = ActOnDeclarator(S, D); 10811 if (!Dcl) 10812 return true; 10813 10814 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10815 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10816 << D.getSourceRange(); 10817 return true; 10818 } 10819 10820 return Dcl; 10821} 10822 10823void Sema::LoadExternalVTableUses() { 10824 if (!ExternalSource) 10825 return; 10826 10827 SmallVector<ExternalVTableUse, 4> VTables; 10828 ExternalSource->ReadUsedVTables(VTables); 10829 SmallVector<VTableUse, 4> NewUses; 10830 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10831 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10832 = VTablesUsed.find(VTables[I].Record); 10833 // Even if a definition wasn't required before, it may be required now. 10834 if (Pos != VTablesUsed.end()) { 10835 if (!Pos->second && VTables[I].DefinitionRequired) 10836 Pos->second = true; 10837 continue; 10838 } 10839 10840 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10841 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10842 } 10843 10844 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10845} 10846 10847void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10848 bool DefinitionRequired) { 10849 // Ignore any vtable uses in unevaluated operands or for classes that do 10850 // not have a vtable. 10851 if (!Class->isDynamicClass() || Class->isDependentContext() || 10852 CurContext->isDependentContext() || 10853 ExprEvalContexts.back().Context == Unevaluated) 10854 return; 10855 10856 // Try to insert this class into the map. 10857 LoadExternalVTableUses(); 10858 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10859 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10860 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10861 if (!Pos.second) { 10862 // If we already had an entry, check to see if we are promoting this vtable 10863 // to required a definition. If so, we need to reappend to the VTableUses 10864 // list, since we may have already processed the first entry. 10865 if (DefinitionRequired && !Pos.first->second) { 10866 Pos.first->second = true; 10867 } else { 10868 // Otherwise, we can early exit. 10869 return; 10870 } 10871 } 10872 10873 // Local classes need to have their virtual members marked 10874 // immediately. For all other classes, we mark their virtual members 10875 // at the end of the translation unit. 10876 if (Class->isLocalClass()) 10877 MarkVirtualMembersReferenced(Loc, Class); 10878 else 10879 VTableUses.push_back(std::make_pair(Class, Loc)); 10880} 10881 10882bool Sema::DefineUsedVTables() { 10883 LoadExternalVTableUses(); 10884 if (VTableUses.empty()) 10885 return false; 10886 10887 // Note: The VTableUses vector could grow as a result of marking 10888 // the members of a class as "used", so we check the size each 10889 // time through the loop and prefer indices (which are stable) to 10890 // iterators (which are not). 10891 bool DefinedAnything = false; 10892 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10893 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10894 if (!Class) 10895 continue; 10896 10897 SourceLocation Loc = VTableUses[I].second; 10898 10899 bool DefineVTable = true; 10900 10901 // If this class has a key function, but that key function is 10902 // defined in another translation unit, we don't need to emit the 10903 // vtable even though we're using it. 10904 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10905 if (KeyFunction && !KeyFunction->hasBody()) { 10906 switch (KeyFunction->getTemplateSpecializationKind()) { 10907 case TSK_Undeclared: 10908 case TSK_ExplicitSpecialization: 10909 case TSK_ExplicitInstantiationDeclaration: 10910 // The key function is in another translation unit. 10911 DefineVTable = false; 10912 break; 10913 10914 case TSK_ExplicitInstantiationDefinition: 10915 case TSK_ImplicitInstantiation: 10916 // We will be instantiating the key function. 10917 break; 10918 } 10919 } else if (!KeyFunction) { 10920 // If we have a class with no key function that is the subject 10921 // of an explicit instantiation declaration, suppress the 10922 // vtable; it will live with the explicit instantiation 10923 // definition. 10924 bool IsExplicitInstantiationDeclaration 10925 = Class->getTemplateSpecializationKind() 10926 == TSK_ExplicitInstantiationDeclaration; 10927 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10928 REnd = Class->redecls_end(); 10929 R != REnd; ++R) { 10930 TemplateSpecializationKind TSK 10931 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10932 if (TSK == TSK_ExplicitInstantiationDeclaration) 10933 IsExplicitInstantiationDeclaration = true; 10934 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10935 IsExplicitInstantiationDeclaration = false; 10936 break; 10937 } 10938 } 10939 10940 if (IsExplicitInstantiationDeclaration) 10941 DefineVTable = false; 10942 } 10943 10944 // The exception specifications for all virtual members may be needed even 10945 // if we are not providing an authoritative form of the vtable in this TU. 10946 // We may choose to emit it available_externally anyway. 10947 if (!DefineVTable) { 10948 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 10949 continue; 10950 } 10951 10952 // Mark all of the virtual members of this class as referenced, so 10953 // that we can build a vtable. Then, tell the AST consumer that a 10954 // vtable for this class is required. 10955 DefinedAnything = true; 10956 MarkVirtualMembersReferenced(Loc, Class); 10957 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10958 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10959 10960 // Optionally warn if we're emitting a weak vtable. 10961 if (Class->getLinkage() == ExternalLinkage && 10962 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10963 const FunctionDecl *KeyFunctionDef = 0; 10964 if (!KeyFunction || 10965 (KeyFunction->hasBody(KeyFunctionDef) && 10966 KeyFunctionDef->isInlined())) 10967 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10968 TSK_ExplicitInstantiationDefinition 10969 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10970 << Class; 10971 } 10972 } 10973 VTableUses.clear(); 10974 10975 return DefinedAnything; 10976} 10977 10978void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 10979 const CXXRecordDecl *RD) { 10980 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 10981 E = RD->method_end(); I != E; ++I) 10982 if ((*I)->isVirtual() && !(*I)->isPure()) 10983 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 10984} 10985 10986void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10987 const CXXRecordDecl *RD) { 10988 // Mark all functions which will appear in RD's vtable as used. 10989 CXXFinalOverriderMap FinalOverriders; 10990 RD->getFinalOverriders(FinalOverriders); 10991 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 10992 E = FinalOverriders.end(); 10993 I != E; ++I) { 10994 for (OverridingMethods::const_iterator OI = I->second.begin(), 10995 OE = I->second.end(); 10996 OI != OE; ++OI) { 10997 assert(OI->second.size() > 0 && "no final overrider"); 10998 CXXMethodDecl *Overrider = OI->second.front().Method; 10999 11000 // C++ [basic.def.odr]p2: 11001 // [...] A virtual member function is used if it is not pure. [...] 11002 if (!Overrider->isPure()) 11003 MarkFunctionReferenced(Loc, Overrider); 11004 } 11005 } 11006 11007 // Only classes that have virtual bases need a VTT. 11008 if (RD->getNumVBases() == 0) 11009 return; 11010 11011 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 11012 e = RD->bases_end(); i != e; ++i) { 11013 const CXXRecordDecl *Base = 11014 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 11015 if (Base->getNumVBases() == 0) 11016 continue; 11017 MarkVirtualMembersReferenced(Loc, Base); 11018 } 11019} 11020 11021/// SetIvarInitializers - This routine builds initialization ASTs for the 11022/// Objective-C implementation whose ivars need be initialized. 11023void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 11024 if (!getLangOpts().CPlusPlus) 11025 return; 11026 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 11027 SmallVector<ObjCIvarDecl*, 8> ivars; 11028 CollectIvarsToConstructOrDestruct(OID, ivars); 11029 if (ivars.empty()) 11030 return; 11031 SmallVector<CXXCtorInitializer*, 32> AllToInit; 11032 for (unsigned i = 0; i < ivars.size(); i++) { 11033 FieldDecl *Field = ivars[i]; 11034 if (Field->isInvalidDecl()) 11035 continue; 11036 11037 CXXCtorInitializer *Member; 11038 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 11039 InitializationKind InitKind = 11040 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 11041 11042 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 11043 ExprResult MemberInit = 11044 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 11045 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 11046 // Note, MemberInit could actually come back empty if no initialization 11047 // is required (e.g., because it would call a trivial default constructor) 11048 if (!MemberInit.get() || MemberInit.isInvalid()) 11049 continue; 11050 11051 Member = 11052 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 11053 SourceLocation(), 11054 MemberInit.takeAs<Expr>(), 11055 SourceLocation()); 11056 AllToInit.push_back(Member); 11057 11058 // Be sure that the destructor is accessible and is marked as referenced. 11059 if (const RecordType *RecordTy 11060 = Context.getBaseElementType(Field->getType()) 11061 ->getAs<RecordType>()) { 11062 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 11063 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 11064 MarkFunctionReferenced(Field->getLocation(), Destructor); 11065 CheckDestructorAccess(Field->getLocation(), Destructor, 11066 PDiag(diag::err_access_dtor_ivar) 11067 << Context.getBaseElementType(Field->getType())); 11068 } 11069 } 11070 } 11071 ObjCImplementation->setIvarInitializers(Context, 11072 AllToInit.data(), AllToInit.size()); 11073 } 11074} 11075 11076static 11077void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 11078 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 11079 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 11080 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 11081 Sema &S) { 11082 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11083 CE = Current.end(); 11084 if (Ctor->isInvalidDecl()) 11085 return; 11086 11087 CXXConstructorDecl *Target = Ctor->getTargetConstructor(); 11088 11089 // Target may not be determinable yet, for instance if this is a dependent 11090 // call in an uninstantiated template. 11091 if (Target) { 11092 const FunctionDecl *FNTarget = 0; 11093 (void)Target->hasBody(FNTarget); 11094 Target = const_cast<CXXConstructorDecl*>( 11095 cast_or_null<CXXConstructorDecl>(FNTarget)); 11096 } 11097 11098 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 11099 // Avoid dereferencing a null pointer here. 11100 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 11101 11102 if (!Current.insert(Canonical)) 11103 return; 11104 11105 // We know that beyond here, we aren't chaining into a cycle. 11106 if (!Target || !Target->isDelegatingConstructor() || 11107 Target->isInvalidDecl() || Valid.count(TCanonical)) { 11108 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11109 Valid.insert(*CI); 11110 Current.clear(); 11111 // We've hit a cycle. 11112 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 11113 Current.count(TCanonical)) { 11114 // If we haven't diagnosed this cycle yet, do so now. 11115 if (!Invalid.count(TCanonical)) { 11116 S.Diag((*Ctor->init_begin())->getSourceLocation(), 11117 diag::warn_delegating_ctor_cycle) 11118 << Ctor; 11119 11120 // Don't add a note for a function delegating directly to itself. 11121 if (TCanonical != Canonical) 11122 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11123 11124 CXXConstructorDecl *C = Target; 11125 while (C->getCanonicalDecl() != Canonical) { 11126 const FunctionDecl *FNTarget = 0; 11127 (void)C->getTargetConstructor()->hasBody(FNTarget); 11128 assert(FNTarget && "Ctor cycle through bodiless function"); 11129 11130 C = const_cast<CXXConstructorDecl*>( 11131 cast<CXXConstructorDecl>(FNTarget)); 11132 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11133 } 11134 } 11135 11136 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11137 Invalid.insert(*CI); 11138 Current.clear(); 11139 } else { 11140 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11141 } 11142} 11143 11144 11145void Sema::CheckDelegatingCtorCycles() { 11146 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11147 11148 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11149 CE = Current.end(); 11150 11151 for (DelegatingCtorDeclsType::iterator 11152 I = DelegatingCtorDecls.begin(ExternalSource), 11153 E = DelegatingCtorDecls.end(); 11154 I != E; ++I) 11155 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11156 11157 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11158 (*CI)->setInvalidDecl(); 11159} 11160 11161namespace { 11162 /// \brief AST visitor that finds references to the 'this' expression. 11163 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 11164 Sema &S; 11165 11166 public: 11167 explicit FindCXXThisExpr(Sema &S) : S(S) { } 11168 11169 bool VisitCXXThisExpr(CXXThisExpr *E) { 11170 S.Diag(E->getLocation(), diag::err_this_static_member_func) 11171 << E->isImplicit(); 11172 return false; 11173 } 11174 }; 11175} 11176 11177bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 11178 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11179 if (!TSInfo) 11180 return false; 11181 11182 TypeLoc TL = TSInfo->getTypeLoc(); 11183 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11184 if (!ProtoTL) 11185 return false; 11186 11187 // C++11 [expr.prim.general]p3: 11188 // [The expression this] shall not appear before the optional 11189 // cv-qualifier-seq and it shall not appear within the declaration of a 11190 // static member function (although its type and value category are defined 11191 // within a static member function as they are within a non-static member 11192 // function). [ Note: this is because declaration matching does not occur 11193 // until the complete declarator is known. - end note ] 11194 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11195 FindCXXThisExpr Finder(*this); 11196 11197 // If the return type came after the cv-qualifier-seq, check it now. 11198 if (Proto->hasTrailingReturn() && 11199 !Finder.TraverseTypeLoc(ProtoTL->getResultLoc())) 11200 return true; 11201 11202 // Check the exception specification. 11203 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 11204 return true; 11205 11206 return checkThisInStaticMemberFunctionAttributes(Method); 11207} 11208 11209bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 11210 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11211 if (!TSInfo) 11212 return false; 11213 11214 TypeLoc TL = TSInfo->getTypeLoc(); 11215 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11216 if (!ProtoTL) 11217 return false; 11218 11219 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11220 FindCXXThisExpr Finder(*this); 11221 11222 switch (Proto->getExceptionSpecType()) { 11223 case EST_Uninstantiated: 11224 case EST_Unevaluated: 11225 case EST_BasicNoexcept: 11226 case EST_DynamicNone: 11227 case EST_MSAny: 11228 case EST_None: 11229 break; 11230 11231 case EST_ComputedNoexcept: 11232 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11233 return true; 11234 11235 case EST_Dynamic: 11236 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11237 EEnd = Proto->exception_end(); 11238 E != EEnd; ++E) { 11239 if (!Finder.TraverseType(*E)) 11240 return true; 11241 } 11242 break; 11243 } 11244 11245 return false; 11246} 11247 11248bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11249 FindCXXThisExpr Finder(*this); 11250 11251 // Check attributes. 11252 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11253 A != AEnd; ++A) { 11254 // FIXME: This should be emitted by tblgen. 11255 Expr *Arg = 0; 11256 ArrayRef<Expr *> Args; 11257 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11258 Arg = G->getArg(); 11259 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11260 Arg = G->getArg(); 11261 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11262 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11263 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11264 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11265 else if (ExclusiveLockFunctionAttr *ELF 11266 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11267 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11268 else if (SharedLockFunctionAttr *SLF 11269 = dyn_cast<SharedLockFunctionAttr>(*A)) 11270 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11271 else if (ExclusiveTrylockFunctionAttr *ETLF 11272 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11273 Arg = ETLF->getSuccessValue(); 11274 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11275 } else if (SharedTrylockFunctionAttr *STLF 11276 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11277 Arg = STLF->getSuccessValue(); 11278 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11279 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11280 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11281 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11282 Arg = LR->getArg(); 11283 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11284 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11285 else if (ExclusiveLocksRequiredAttr *ELR 11286 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11287 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11288 else if (SharedLocksRequiredAttr *SLR 11289 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11290 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11291 11292 if (Arg && !Finder.TraverseStmt(Arg)) 11293 return true; 11294 11295 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11296 if (!Finder.TraverseStmt(Args[I])) 11297 return true; 11298 } 11299 } 11300 11301 return false; 11302} 11303 11304void 11305Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 11306 ArrayRef<ParsedType> DynamicExceptions, 11307 ArrayRef<SourceRange> DynamicExceptionRanges, 11308 Expr *NoexceptExpr, 11309 llvm::SmallVectorImpl<QualType> &Exceptions, 11310 FunctionProtoType::ExtProtoInfo &EPI) { 11311 Exceptions.clear(); 11312 EPI.ExceptionSpecType = EST; 11313 if (EST == EST_Dynamic) { 11314 Exceptions.reserve(DynamicExceptions.size()); 11315 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 11316 // FIXME: Preserve type source info. 11317 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 11318 11319 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 11320 collectUnexpandedParameterPacks(ET, Unexpanded); 11321 if (!Unexpanded.empty()) { 11322 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 11323 UPPC_ExceptionType, 11324 Unexpanded); 11325 continue; 11326 } 11327 11328 // Check that the type is valid for an exception spec, and 11329 // drop it if not. 11330 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 11331 Exceptions.push_back(ET); 11332 } 11333 EPI.NumExceptions = Exceptions.size(); 11334 EPI.Exceptions = Exceptions.data(); 11335 return; 11336 } 11337 11338 if (EST == EST_ComputedNoexcept) { 11339 // If an error occurred, there's no expression here. 11340 if (NoexceptExpr) { 11341 assert((NoexceptExpr->isTypeDependent() || 11342 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 11343 Context.BoolTy) && 11344 "Parser should have made sure that the expression is boolean"); 11345 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 11346 EPI.ExceptionSpecType = EST_BasicNoexcept; 11347 return; 11348 } 11349 11350 if (!NoexceptExpr->isValueDependent()) 11351 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 11352 diag::err_noexcept_needs_constant_expression, 11353 /*AllowFold*/ false).take(); 11354 EPI.NoexceptExpr = NoexceptExpr; 11355 } 11356 return; 11357 } 11358} 11359 11360/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11361Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11362 // Implicitly declared functions (e.g. copy constructors) are 11363 // __host__ __device__ 11364 if (D->isImplicit()) 11365 return CFT_HostDevice; 11366 11367 if (D->hasAttr<CUDAGlobalAttr>()) 11368 return CFT_Global; 11369 11370 if (D->hasAttr<CUDADeviceAttr>()) { 11371 if (D->hasAttr<CUDAHostAttr>()) 11372 return CFT_HostDevice; 11373 else 11374 return CFT_Device; 11375 } 11376 11377 return CFT_Host; 11378} 11379 11380bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11381 CUDAFunctionTarget CalleeTarget) { 11382 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11383 // Callable from the device only." 11384 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11385 return true; 11386 11387 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11388 // Callable from the host only." 11389 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11390 // Callable from the host only." 11391 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11392 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11393 return true; 11394 11395 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11396 return true; 11397 11398 return false; 11399} 11400