SemaDeclCXX.cpp revision d777e2845110469182809e4efc577899395805f7
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 Determine whether we have the same C++ record definition. 1022/// 1023/// Used as a helper function in Sema::CheckBaseSpecifier, below. 1024static bool sameCXXRecordDef(const CXXRecordDecl *BaseDefinition, 1025 void *UserData) { 1026 return (CXXRecordDecl *)UserData != BaseDefinition; 1027} 1028 1029/// \brief Check the validity of a C++ base class specifier. 1030/// 1031/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1032/// and returns NULL otherwise. 1033CXXBaseSpecifier * 1034Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1035 SourceRange SpecifierRange, 1036 bool Virtual, AccessSpecifier Access, 1037 TypeSourceInfo *TInfo, 1038 SourceLocation EllipsisLoc) { 1039 QualType BaseType = TInfo->getType(); 1040 1041 // C++ [class.union]p1: 1042 // A union shall not have base classes. 1043 if (Class->isUnion()) { 1044 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1045 << SpecifierRange; 1046 return 0; 1047 } 1048 1049 if (EllipsisLoc.isValid() && 1050 !TInfo->getType()->containsUnexpandedParameterPack()) { 1051 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1052 << TInfo->getTypeLoc().getSourceRange(); 1053 EllipsisLoc = SourceLocation(); 1054 } 1055 1056 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1057 1058 if (BaseType->isDependentType()) { 1059 // Make sure that we don't have circular inheritance among our dependent 1060 // bases. For non-dependent bases, the check for completeness below handles 1061 // this. 1062 if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) { 1063 if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() || 1064 ((BaseDecl = BaseDecl->getDefinition()) && 1065 !BaseDecl->forallBases(&sameCXXRecordDef, Class))) { 1066 Diag(BaseLoc, diag::err_circular_inheritance) 1067 << BaseType << Context.getTypeDeclType(Class); 1068 1069 if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl()) 1070 Diag(BaseDecl->getLocation(), diag::note_previous_decl) 1071 << BaseType; 1072 1073 return 0; 1074 } 1075 } 1076 1077 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1078 Class->getTagKind() == TTK_Class, 1079 Access, TInfo, EllipsisLoc); 1080 } 1081 1082 // Base specifiers must be record types. 1083 if (!BaseType->isRecordType()) { 1084 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1085 return 0; 1086 } 1087 1088 // C++ [class.union]p1: 1089 // A union shall not be used as a base class. 1090 if (BaseType->isUnionType()) { 1091 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1092 return 0; 1093 } 1094 1095 // C++ [class.derived]p2: 1096 // The class-name in a base-specifier shall not be an incompletely 1097 // defined class. 1098 if (RequireCompleteType(BaseLoc, BaseType, 1099 diag::err_incomplete_base_class, SpecifierRange)) { 1100 Class->setInvalidDecl(); 1101 return 0; 1102 } 1103 1104 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1105 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1106 assert(BaseDecl && "Record type has no declaration"); 1107 BaseDecl = BaseDecl->getDefinition(); 1108 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1109 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1110 assert(CXXBaseDecl && "Base type is not a C++ type"); 1111 1112 // C++ [class]p3: 1113 // If a class is marked final and it appears as a base-type-specifier in 1114 // base-clause, the program is ill-formed. 1115 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1116 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1117 << CXXBaseDecl->getDeclName(); 1118 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1119 << CXXBaseDecl->getDeclName(); 1120 return 0; 1121 } 1122 1123 if (BaseDecl->isInvalidDecl()) 1124 Class->setInvalidDecl(); 1125 1126 // Create the base specifier. 1127 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1128 Class->getTagKind() == TTK_Class, 1129 Access, TInfo, EllipsisLoc); 1130} 1131 1132/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1133/// one entry in the base class list of a class specifier, for 1134/// example: 1135/// class foo : public bar, virtual private baz { 1136/// 'public bar' and 'virtual private baz' are each base-specifiers. 1137BaseResult 1138Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1139 bool Virtual, AccessSpecifier Access, 1140 ParsedType basetype, SourceLocation BaseLoc, 1141 SourceLocation EllipsisLoc) { 1142 if (!classdecl) 1143 return true; 1144 1145 AdjustDeclIfTemplate(classdecl); 1146 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1147 if (!Class) 1148 return true; 1149 1150 TypeSourceInfo *TInfo = 0; 1151 GetTypeFromParser(basetype, &TInfo); 1152 1153 if (EllipsisLoc.isInvalid() && 1154 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1155 UPPC_BaseType)) 1156 return true; 1157 1158 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1159 Virtual, Access, TInfo, 1160 EllipsisLoc)) 1161 return BaseSpec; 1162 else 1163 Class->setInvalidDecl(); 1164 1165 return true; 1166} 1167 1168/// \brief Performs the actual work of attaching the given base class 1169/// specifiers to a C++ class. 1170bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1171 unsigned NumBases) { 1172 if (NumBases == 0) 1173 return false; 1174 1175 // Used to keep track of which base types we have already seen, so 1176 // that we can properly diagnose redundant direct base types. Note 1177 // that the key is always the unqualified canonical type of the base 1178 // class. 1179 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1180 1181 // Copy non-redundant base specifiers into permanent storage. 1182 unsigned NumGoodBases = 0; 1183 bool Invalid = false; 1184 for (unsigned idx = 0; idx < NumBases; ++idx) { 1185 QualType NewBaseType 1186 = Context.getCanonicalType(Bases[idx]->getType()); 1187 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1188 1189 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1190 if (KnownBase) { 1191 // C++ [class.mi]p3: 1192 // A class shall not be specified as a direct base class of a 1193 // derived class more than once. 1194 Diag(Bases[idx]->getLocStart(), 1195 diag::err_duplicate_base_class) 1196 << KnownBase->getType() 1197 << Bases[idx]->getSourceRange(); 1198 1199 // Delete the duplicate base class specifier; we're going to 1200 // overwrite its pointer later. 1201 Context.Deallocate(Bases[idx]); 1202 1203 Invalid = true; 1204 } else { 1205 // Okay, add this new base class. 1206 KnownBase = Bases[idx]; 1207 Bases[NumGoodBases++] = Bases[idx]; 1208 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) { 1209 const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); 1210 if (Class->isInterface() && 1211 (!RD->isInterface() || 1212 KnownBase->getAccessSpecifier() != AS_public)) { 1213 // The Microsoft extension __interface does not permit bases that 1214 // are not themselves public interfaces. 1215 Diag(KnownBase->getLocStart(), diag::err_invalid_base_in_interface) 1216 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getName() 1217 << RD->getSourceRange(); 1218 Invalid = true; 1219 } 1220 if (RD->hasAttr<WeakAttr>()) 1221 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1222 } 1223 } 1224 } 1225 1226 // Attach the remaining base class specifiers to the derived class. 1227 Class->setBases(Bases, NumGoodBases); 1228 1229 // Delete the remaining (good) base class specifiers, since their 1230 // data has been copied into the CXXRecordDecl. 1231 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1232 Context.Deallocate(Bases[idx]); 1233 1234 return Invalid; 1235} 1236 1237/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1238/// class, after checking whether there are any duplicate base 1239/// classes. 1240void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1241 unsigned NumBases) { 1242 if (!ClassDecl || !Bases || !NumBases) 1243 return; 1244 1245 AdjustDeclIfTemplate(ClassDecl); 1246 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1247 (CXXBaseSpecifier**)(Bases), NumBases); 1248} 1249 1250static CXXRecordDecl *GetClassForType(QualType T) { 1251 if (const RecordType *RT = T->getAs<RecordType>()) 1252 return cast<CXXRecordDecl>(RT->getDecl()); 1253 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1254 return ICT->getDecl(); 1255 else 1256 return 0; 1257} 1258 1259/// \brief Determine whether the type \p Derived is a C++ class that is 1260/// derived from the type \p Base. 1261bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1262 if (!getLangOpts().CPlusPlus) 1263 return false; 1264 1265 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1266 if (!DerivedRD) 1267 return false; 1268 1269 CXXRecordDecl *BaseRD = GetClassForType(Base); 1270 if (!BaseRD) 1271 return false; 1272 1273 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1274 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1275} 1276 1277/// \brief Determine whether the type \p Derived is a C++ class that is 1278/// derived from the type \p Base. 1279bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1280 if (!getLangOpts().CPlusPlus) 1281 return false; 1282 1283 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1284 if (!DerivedRD) 1285 return false; 1286 1287 CXXRecordDecl *BaseRD = GetClassForType(Base); 1288 if (!BaseRD) 1289 return false; 1290 1291 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1292} 1293 1294void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1295 CXXCastPath &BasePathArray) { 1296 assert(BasePathArray.empty() && "Base path array must be empty!"); 1297 assert(Paths.isRecordingPaths() && "Must record paths!"); 1298 1299 const CXXBasePath &Path = Paths.front(); 1300 1301 // We first go backward and check if we have a virtual base. 1302 // FIXME: It would be better if CXXBasePath had the base specifier for 1303 // the nearest virtual base. 1304 unsigned Start = 0; 1305 for (unsigned I = Path.size(); I != 0; --I) { 1306 if (Path[I - 1].Base->isVirtual()) { 1307 Start = I - 1; 1308 break; 1309 } 1310 } 1311 1312 // Now add all bases. 1313 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1314 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1315} 1316 1317/// \brief Determine whether the given base path includes a virtual 1318/// base class. 1319bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1320 for (CXXCastPath::const_iterator B = BasePath.begin(), 1321 BEnd = BasePath.end(); 1322 B != BEnd; ++B) 1323 if ((*B)->isVirtual()) 1324 return true; 1325 1326 return false; 1327} 1328 1329/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1330/// conversion (where Derived and Base are class types) is 1331/// well-formed, meaning that the conversion is unambiguous (and 1332/// that all of the base classes are accessible). Returns true 1333/// and emits a diagnostic if the code is ill-formed, returns false 1334/// otherwise. Loc is the location where this routine should point to 1335/// if there is an error, and Range is the source range to highlight 1336/// if there is an error. 1337bool 1338Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1339 unsigned InaccessibleBaseID, 1340 unsigned AmbigiousBaseConvID, 1341 SourceLocation Loc, SourceRange Range, 1342 DeclarationName Name, 1343 CXXCastPath *BasePath) { 1344 // First, determine whether the path from Derived to Base is 1345 // ambiguous. This is slightly more expensive than checking whether 1346 // the Derived to Base conversion exists, because here we need to 1347 // explore multiple paths to determine if there is an ambiguity. 1348 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1349 /*DetectVirtual=*/false); 1350 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1351 assert(DerivationOkay && 1352 "Can only be used with a derived-to-base conversion"); 1353 (void)DerivationOkay; 1354 1355 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1356 if (InaccessibleBaseID) { 1357 // Check that the base class can be accessed. 1358 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1359 InaccessibleBaseID)) { 1360 case AR_inaccessible: 1361 return true; 1362 case AR_accessible: 1363 case AR_dependent: 1364 case AR_delayed: 1365 break; 1366 } 1367 } 1368 1369 // Build a base path if necessary. 1370 if (BasePath) 1371 BuildBasePathArray(Paths, *BasePath); 1372 return false; 1373 } 1374 1375 // We know that the derived-to-base conversion is ambiguous, and 1376 // we're going to produce a diagnostic. Perform the derived-to-base 1377 // search just one more time to compute all of the possible paths so 1378 // that we can print them out. This is more expensive than any of 1379 // the previous derived-to-base checks we've done, but at this point 1380 // performance isn't as much of an issue. 1381 Paths.clear(); 1382 Paths.setRecordingPaths(true); 1383 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1384 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1385 (void)StillOkay; 1386 1387 // Build up a textual representation of the ambiguous paths, e.g., 1388 // D -> B -> A, that will be used to illustrate the ambiguous 1389 // conversions in the diagnostic. We only print one of the paths 1390 // to each base class subobject. 1391 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1392 1393 Diag(Loc, AmbigiousBaseConvID) 1394 << Derived << Base << PathDisplayStr << Range << Name; 1395 return true; 1396} 1397 1398bool 1399Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1400 SourceLocation Loc, SourceRange Range, 1401 CXXCastPath *BasePath, 1402 bool IgnoreAccess) { 1403 return CheckDerivedToBaseConversion(Derived, Base, 1404 IgnoreAccess ? 0 1405 : diag::err_upcast_to_inaccessible_base, 1406 diag::err_ambiguous_derived_to_base_conv, 1407 Loc, Range, DeclarationName(), 1408 BasePath); 1409} 1410 1411 1412/// @brief Builds a string representing ambiguous paths from a 1413/// specific derived class to different subobjects of the same base 1414/// class. 1415/// 1416/// This function builds a string that can be used in error messages 1417/// to show the different paths that one can take through the 1418/// inheritance hierarchy to go from the derived class to different 1419/// subobjects of a base class. The result looks something like this: 1420/// @code 1421/// struct D -> struct B -> struct A 1422/// struct D -> struct C -> struct A 1423/// @endcode 1424std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1425 std::string PathDisplayStr; 1426 std::set<unsigned> DisplayedPaths; 1427 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1428 Path != Paths.end(); ++Path) { 1429 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1430 // We haven't displayed a path to this particular base 1431 // class subobject yet. 1432 PathDisplayStr += "\n "; 1433 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1434 for (CXXBasePath::const_iterator Element = Path->begin(); 1435 Element != Path->end(); ++Element) 1436 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1437 } 1438 } 1439 1440 return PathDisplayStr; 1441} 1442 1443//===----------------------------------------------------------------------===// 1444// C++ class member Handling 1445//===----------------------------------------------------------------------===// 1446 1447/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1448bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1449 SourceLocation ASLoc, 1450 SourceLocation ColonLoc, 1451 AttributeList *Attrs) { 1452 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1453 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1454 ASLoc, ColonLoc); 1455 CurContext->addHiddenDecl(ASDecl); 1456 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1457} 1458 1459/// CheckOverrideControl - Check C++11 override control semantics. 1460void Sema::CheckOverrideControl(Decl *D) { 1461 if (D->isInvalidDecl()) 1462 return; 1463 1464 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1465 1466 // Do we know which functions this declaration might be overriding? 1467 bool OverridesAreKnown = !MD || 1468 (!MD->getParent()->hasAnyDependentBases() && 1469 !MD->getType()->isDependentType()); 1470 1471 if (!MD || !MD->isVirtual()) { 1472 if (OverridesAreKnown) { 1473 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1474 Diag(OA->getLocation(), 1475 diag::override_keyword_only_allowed_on_virtual_member_functions) 1476 << "override" << FixItHint::CreateRemoval(OA->getLocation()); 1477 D->dropAttr<OverrideAttr>(); 1478 } 1479 if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1480 Diag(FA->getLocation(), 1481 diag::override_keyword_only_allowed_on_virtual_member_functions) 1482 << "final" << FixItHint::CreateRemoval(FA->getLocation()); 1483 D->dropAttr<FinalAttr>(); 1484 } 1485 } 1486 return; 1487 } 1488 1489 if (!OverridesAreKnown) 1490 return; 1491 1492 // C++11 [class.virtual]p5: 1493 // If a virtual function is marked with the virt-specifier override and 1494 // does not override a member function of a base class, the program is 1495 // ill-formed. 1496 bool HasOverriddenMethods = 1497 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1498 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) 1499 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) 1500 << MD->getDeclName(); 1501} 1502 1503/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1504/// function overrides a virtual member function marked 'final', according to 1505/// C++11 [class.virtual]p4. 1506bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1507 const CXXMethodDecl *Old) { 1508 if (!Old->hasAttr<FinalAttr>()) 1509 return false; 1510 1511 Diag(New->getLocation(), diag::err_final_function_overridden) 1512 << New->getDeclName(); 1513 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1514 return true; 1515} 1516 1517static bool InitializationHasSideEffects(const FieldDecl &FD) { 1518 const Type *T = FD.getType()->getBaseElementTypeUnsafe(); 1519 // FIXME: Destruction of ObjC lifetime types has side-effects. 1520 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) 1521 return !RD->isCompleteDefinition() || 1522 !RD->hasTrivialDefaultConstructor() || 1523 !RD->hasTrivialDestructor(); 1524 return false; 1525} 1526 1527/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1528/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1529/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1530/// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1531/// present (but parsing it has been deferred). 1532Decl * 1533Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1534 MultiTemplateParamsArg TemplateParameterLists, 1535 Expr *BW, const VirtSpecifiers &VS, 1536 InClassInitStyle InitStyle) { 1537 const DeclSpec &DS = D.getDeclSpec(); 1538 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1539 DeclarationName Name = NameInfo.getName(); 1540 SourceLocation Loc = NameInfo.getLoc(); 1541 1542 // For anonymous bitfields, the location should point to the type. 1543 if (Loc.isInvalid()) 1544 Loc = D.getLocStart(); 1545 1546 Expr *BitWidth = static_cast<Expr*>(BW); 1547 1548 assert(isa<CXXRecordDecl>(CurContext)); 1549 assert(!DS.isFriendSpecified()); 1550 1551 bool isFunc = D.isDeclarationOfFunction(); 1552 1553 if (cast<CXXRecordDecl>(CurContext)->isInterface()) { 1554 // The Microsoft extension __interface only permits public member functions 1555 // and prohibits constructors, destructors, operators, non-public member 1556 // functions, static methods and data members. 1557 unsigned InvalidDecl; 1558 bool ShowDeclName = true; 1559 if (!isFunc) 1560 InvalidDecl = (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) ? 0 : 1; 1561 else if (AS != AS_public) 1562 InvalidDecl = 2; 1563 else if (DS.getStorageClassSpec() == DeclSpec::SCS_static) 1564 InvalidDecl = 3; 1565 else switch (Name.getNameKind()) { 1566 case DeclarationName::CXXConstructorName: 1567 InvalidDecl = 4; 1568 ShowDeclName = false; 1569 break; 1570 1571 case DeclarationName::CXXDestructorName: 1572 InvalidDecl = 5; 1573 ShowDeclName = false; 1574 break; 1575 1576 case DeclarationName::CXXOperatorName: 1577 case DeclarationName::CXXConversionFunctionName: 1578 InvalidDecl = 6; 1579 break; 1580 1581 default: 1582 InvalidDecl = 0; 1583 break; 1584 } 1585 1586 if (InvalidDecl) { 1587 if (ShowDeclName) 1588 Diag(Loc, diag::err_invalid_member_in_interface) 1589 << (InvalidDecl-1) << Name; 1590 else 1591 Diag(Loc, diag::err_invalid_member_in_interface) 1592 << (InvalidDecl-1) << ""; 1593 return 0; 1594 } 1595 } 1596 1597 // C++ 9.2p6: A member shall not be declared to have automatic storage 1598 // duration (auto, register) or with the extern storage-class-specifier. 1599 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1600 // data members and cannot be applied to names declared const or static, 1601 // and cannot be applied to reference members. 1602 switch (DS.getStorageClassSpec()) { 1603 case DeclSpec::SCS_unspecified: 1604 case DeclSpec::SCS_typedef: 1605 case DeclSpec::SCS_static: 1606 // FALL THROUGH. 1607 break; 1608 case DeclSpec::SCS_mutable: 1609 if (isFunc) { 1610 if (DS.getStorageClassSpecLoc().isValid()) 1611 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1612 else 1613 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1614 1615 // FIXME: It would be nicer if the keyword was ignored only for this 1616 // declarator. Otherwise we could get follow-up errors. 1617 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1618 } 1619 break; 1620 default: 1621 if (DS.getStorageClassSpecLoc().isValid()) 1622 Diag(DS.getStorageClassSpecLoc(), 1623 diag::err_storageclass_invalid_for_member); 1624 else 1625 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1626 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1627 } 1628 1629 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1630 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1631 !isFunc); 1632 1633 Decl *Member; 1634 if (isInstField) { 1635 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1636 1637 // Data members must have identifiers for names. 1638 if (!Name.isIdentifier()) { 1639 Diag(Loc, diag::err_bad_variable_name) 1640 << Name; 1641 return 0; 1642 } 1643 1644 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1645 1646 // Member field could not be with "template" keyword. 1647 // So TemplateParameterLists should be empty in this case. 1648 if (TemplateParameterLists.size()) { 1649 TemplateParameterList* TemplateParams = TemplateParameterLists[0]; 1650 if (TemplateParams->size()) { 1651 // There is no such thing as a member field template. 1652 Diag(D.getIdentifierLoc(), diag::err_template_member) 1653 << II 1654 << SourceRange(TemplateParams->getTemplateLoc(), 1655 TemplateParams->getRAngleLoc()); 1656 } else { 1657 // There is an extraneous 'template<>' for this member. 1658 Diag(TemplateParams->getTemplateLoc(), 1659 diag::err_template_member_noparams) 1660 << II 1661 << SourceRange(TemplateParams->getTemplateLoc(), 1662 TemplateParams->getRAngleLoc()); 1663 } 1664 return 0; 1665 } 1666 1667 if (SS.isSet() && !SS.isInvalid()) { 1668 // The user provided a superfluous scope specifier inside a class 1669 // definition: 1670 // 1671 // class X { 1672 // int X::member; 1673 // }; 1674 if (DeclContext *DC = computeDeclContext(SS, false)) 1675 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1676 else 1677 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1678 << Name << SS.getRange(); 1679 1680 SS.clear(); 1681 } 1682 1683 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1684 InitStyle, AS); 1685 assert(Member && "HandleField never returns null"); 1686 } else { 1687 assert(InitStyle == ICIS_NoInit); 1688 1689 Member = HandleDeclarator(S, D, TemplateParameterLists); 1690 if (!Member) { 1691 return 0; 1692 } 1693 1694 // Non-instance-fields can't have a bitfield. 1695 if (BitWidth) { 1696 if (Member->isInvalidDecl()) { 1697 // don't emit another diagnostic. 1698 } else if (isa<VarDecl>(Member)) { 1699 // C++ 9.6p3: A bit-field shall not be a static member. 1700 // "static member 'A' cannot be a bit-field" 1701 Diag(Loc, diag::err_static_not_bitfield) 1702 << Name << BitWidth->getSourceRange(); 1703 } else if (isa<TypedefDecl>(Member)) { 1704 // "typedef member 'x' cannot be a bit-field" 1705 Diag(Loc, diag::err_typedef_not_bitfield) 1706 << Name << BitWidth->getSourceRange(); 1707 } else { 1708 // A function typedef ("typedef int f(); f a;"). 1709 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1710 Diag(Loc, diag::err_not_integral_type_bitfield) 1711 << Name << cast<ValueDecl>(Member)->getType() 1712 << BitWidth->getSourceRange(); 1713 } 1714 1715 BitWidth = 0; 1716 Member->setInvalidDecl(); 1717 } 1718 1719 Member->setAccess(AS); 1720 1721 // If we have declared a member function template, set the access of the 1722 // templated declaration as well. 1723 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1724 FunTmpl->getTemplatedDecl()->setAccess(AS); 1725 } 1726 1727 if (VS.isOverrideSpecified()) 1728 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1729 if (VS.isFinalSpecified()) 1730 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1731 1732 if (VS.getLastLocation().isValid()) { 1733 // Update the end location of a method that has a virt-specifiers. 1734 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1735 MD->setRangeEnd(VS.getLastLocation()); 1736 } 1737 1738 CheckOverrideControl(Member); 1739 1740 assert((Name || isInstField) && "No identifier for non-field ?"); 1741 1742 if (isInstField) { 1743 FieldDecl *FD = cast<FieldDecl>(Member); 1744 FieldCollector->Add(FD); 1745 1746 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 1747 FD->getLocation()) 1748 != DiagnosticsEngine::Ignored) { 1749 // Remember all explicit private FieldDecls that have a name, no side 1750 // effects and are not part of a dependent type declaration. 1751 if (!FD->isImplicit() && FD->getDeclName() && 1752 FD->getAccess() == AS_private && 1753 !FD->hasAttr<UnusedAttr>() && 1754 !FD->getParent()->isDependentContext() && 1755 !InitializationHasSideEffects(*FD)) 1756 UnusedPrivateFields.insert(FD); 1757 } 1758 } 1759 1760 return Member; 1761} 1762 1763namespace { 1764 class UninitializedFieldVisitor 1765 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 1766 Sema &S; 1767 ValueDecl *VD; 1768 public: 1769 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 1770 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context), 1771 S(S), VD(VD) { 1772 } 1773 1774 void HandleExpr(Expr *E) { 1775 if (!E) return; 1776 1777 // Expressions like x(x) sometimes lack the surrounding expressions 1778 // but need to be checked anyways. 1779 HandleValue(E); 1780 Visit(E); 1781 } 1782 1783 void HandleValue(Expr *E) { 1784 E = E->IgnoreParens(); 1785 1786 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 1787 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 1788 return; 1789 Expr *Base = E; 1790 while (isa<MemberExpr>(Base)) { 1791 ME = dyn_cast<MemberExpr>(Base); 1792 if (VarDecl *VarD = dyn_cast<VarDecl>(ME->getMemberDecl())) 1793 if (VarD->hasGlobalStorage()) 1794 return; 1795 Base = ME->getBase(); 1796 } 1797 1798 if (VD == ME->getMemberDecl() && isa<CXXThisExpr>(Base)) { 1799 unsigned diag = VD->getType()->isReferenceType() 1800 ? diag::warn_reference_field_is_uninit 1801 : diag::warn_field_is_uninit; 1802 S.Diag(ME->getExprLoc(), diag) << ME->getMemberNameInfo().getName(); 1803 return; 1804 } 1805 } 1806 1807 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 1808 HandleValue(CO->getTrueExpr()); 1809 HandleValue(CO->getFalseExpr()); 1810 return; 1811 } 1812 1813 if (BinaryConditionalOperator *BCO = 1814 dyn_cast<BinaryConditionalOperator>(E)) { 1815 HandleValue(BCO->getCommon()); 1816 HandleValue(BCO->getFalseExpr()); 1817 return; 1818 } 1819 1820 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 1821 switch (BO->getOpcode()) { 1822 default: 1823 return; 1824 case(BO_PtrMemD): 1825 case(BO_PtrMemI): 1826 HandleValue(BO->getLHS()); 1827 return; 1828 case(BO_Comma): 1829 HandleValue(BO->getRHS()); 1830 return; 1831 } 1832 } 1833 } 1834 1835 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 1836 if (E->getCastKind() == CK_LValueToRValue) 1837 HandleValue(E->getSubExpr()); 1838 1839 Inherited::VisitImplicitCastExpr(E); 1840 } 1841 1842 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 1843 Expr *Callee = E->getCallee(); 1844 if (isa<MemberExpr>(Callee)) 1845 HandleValue(Callee); 1846 1847 Inherited::VisitCXXMemberCallExpr(E); 1848 } 1849 }; 1850 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E, 1851 ValueDecl *VD) { 1852 UninitializedFieldVisitor(S, VD).HandleExpr(E); 1853 } 1854} // namespace 1855 1856/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1857/// in-class initializer for a non-static C++ class member, and after 1858/// instantiating an in-class initializer in a class template. Such actions 1859/// are deferred until the class is complete. 1860void 1861Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 1862 Expr *InitExpr) { 1863 FieldDecl *FD = cast<FieldDecl>(D); 1864 assert(FD->getInClassInitStyle() != ICIS_NoInit && 1865 "must set init style when field is created"); 1866 1867 if (!InitExpr) { 1868 FD->setInvalidDecl(); 1869 FD->removeInClassInitializer(); 1870 return; 1871 } 1872 1873 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1874 FD->setInvalidDecl(); 1875 FD->removeInClassInitializer(); 1876 return; 1877 } 1878 1879 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, InitLoc) 1880 != DiagnosticsEngine::Ignored) { 1881 CheckInitExprContainsUninitializedFields(*this, InitExpr, FD); 1882 } 1883 1884 ExprResult Init = InitExpr; 1885 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent() && 1886 !FD->getDeclContext()->isDependentContext()) { 1887 // Note: We don't type-check when we're in a dependent context, because 1888 // the initialization-substitution code does not properly handle direct 1889 // list initialization. We have the same hackaround for ctor-initializers. 1890 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1891 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1892 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1893 } 1894 Expr **Inits = &InitExpr; 1895 unsigned NumInits = 1; 1896 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1897 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 1898 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1899 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 1900 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 1901 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 1902 if (Init.isInvalid()) { 1903 FD->setInvalidDecl(); 1904 return; 1905 } 1906 1907 CheckImplicitConversions(Init.get(), InitLoc); 1908 } 1909 1910 // C++0x [class.base.init]p7: 1911 // The initialization of each base and member constitutes a 1912 // full-expression. 1913 Init = MaybeCreateExprWithCleanups(Init); 1914 if (Init.isInvalid()) { 1915 FD->setInvalidDecl(); 1916 return; 1917 } 1918 1919 InitExpr = Init.release(); 1920 1921 FD->setInClassInitializer(InitExpr); 1922} 1923 1924/// \brief Find the direct and/or virtual base specifiers that 1925/// correspond to the given base type, for use in base initialization 1926/// within a constructor. 1927static bool FindBaseInitializer(Sema &SemaRef, 1928 CXXRecordDecl *ClassDecl, 1929 QualType BaseType, 1930 const CXXBaseSpecifier *&DirectBaseSpec, 1931 const CXXBaseSpecifier *&VirtualBaseSpec) { 1932 // First, check for a direct base class. 1933 DirectBaseSpec = 0; 1934 for (CXXRecordDecl::base_class_const_iterator Base 1935 = ClassDecl->bases_begin(); 1936 Base != ClassDecl->bases_end(); ++Base) { 1937 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1938 // We found a direct base of this type. That's what we're 1939 // initializing. 1940 DirectBaseSpec = &*Base; 1941 break; 1942 } 1943 } 1944 1945 // Check for a virtual base class. 1946 // FIXME: We might be able to short-circuit this if we know in advance that 1947 // there are no virtual bases. 1948 VirtualBaseSpec = 0; 1949 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1950 // We haven't found a base yet; search the class hierarchy for a 1951 // virtual base class. 1952 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1953 /*DetectVirtual=*/false); 1954 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1955 BaseType, Paths)) { 1956 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1957 Path != Paths.end(); ++Path) { 1958 if (Path->back().Base->isVirtual()) { 1959 VirtualBaseSpec = Path->back().Base; 1960 break; 1961 } 1962 } 1963 } 1964 } 1965 1966 return DirectBaseSpec || VirtualBaseSpec; 1967} 1968 1969/// \brief Handle a C++ member initializer using braced-init-list syntax. 1970MemInitResult 1971Sema::ActOnMemInitializer(Decl *ConstructorD, 1972 Scope *S, 1973 CXXScopeSpec &SS, 1974 IdentifierInfo *MemberOrBase, 1975 ParsedType TemplateTypeTy, 1976 const DeclSpec &DS, 1977 SourceLocation IdLoc, 1978 Expr *InitList, 1979 SourceLocation EllipsisLoc) { 1980 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1981 DS, IdLoc, InitList, 1982 EllipsisLoc); 1983} 1984 1985/// \brief Handle a C++ member initializer using parentheses syntax. 1986MemInitResult 1987Sema::ActOnMemInitializer(Decl *ConstructorD, 1988 Scope *S, 1989 CXXScopeSpec &SS, 1990 IdentifierInfo *MemberOrBase, 1991 ParsedType TemplateTypeTy, 1992 const DeclSpec &DS, 1993 SourceLocation IdLoc, 1994 SourceLocation LParenLoc, 1995 Expr **Args, unsigned NumArgs, 1996 SourceLocation RParenLoc, 1997 SourceLocation EllipsisLoc) { 1998 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, 1999 llvm::makeArrayRef(Args, NumArgs), 2000 RParenLoc); 2001 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2002 DS, IdLoc, List, EllipsisLoc); 2003} 2004 2005namespace { 2006 2007// Callback to only accept typo corrections that can be a valid C++ member 2008// intializer: either a non-static field member or a base class. 2009class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 2010 public: 2011 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 2012 : ClassDecl(ClassDecl) {} 2013 2014 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 2015 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 2016 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 2017 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 2018 else 2019 return isa<TypeDecl>(ND); 2020 } 2021 return false; 2022 } 2023 2024 private: 2025 CXXRecordDecl *ClassDecl; 2026}; 2027 2028} 2029 2030/// \brief Handle a C++ member initializer. 2031MemInitResult 2032Sema::BuildMemInitializer(Decl *ConstructorD, 2033 Scope *S, 2034 CXXScopeSpec &SS, 2035 IdentifierInfo *MemberOrBase, 2036 ParsedType TemplateTypeTy, 2037 const DeclSpec &DS, 2038 SourceLocation IdLoc, 2039 Expr *Init, 2040 SourceLocation EllipsisLoc) { 2041 if (!ConstructorD) 2042 return true; 2043 2044 AdjustDeclIfTemplate(ConstructorD); 2045 2046 CXXConstructorDecl *Constructor 2047 = dyn_cast<CXXConstructorDecl>(ConstructorD); 2048 if (!Constructor) { 2049 // The user wrote a constructor initializer on a function that is 2050 // not a C++ constructor. Ignore the error for now, because we may 2051 // have more member initializers coming; we'll diagnose it just 2052 // once in ActOnMemInitializers. 2053 return true; 2054 } 2055 2056 CXXRecordDecl *ClassDecl = Constructor->getParent(); 2057 2058 // C++ [class.base.init]p2: 2059 // Names in a mem-initializer-id are looked up in the scope of the 2060 // constructor's class and, if not found in that scope, are looked 2061 // up in the scope containing the constructor's definition. 2062 // [Note: if the constructor's class contains a member with the 2063 // same name as a direct or virtual base class of the class, a 2064 // mem-initializer-id naming the member or base class and composed 2065 // of a single identifier refers to the class member. A 2066 // mem-initializer-id for the hidden base class may be specified 2067 // using a qualified name. ] 2068 if (!SS.getScopeRep() && !TemplateTypeTy) { 2069 // Look for a member, first. 2070 DeclContext::lookup_result Result 2071 = ClassDecl->lookup(MemberOrBase); 2072 if (Result.first != Result.second) { 2073 ValueDecl *Member; 2074 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 2075 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 2076 if (EllipsisLoc.isValid()) 2077 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 2078 << MemberOrBase 2079 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 2080 2081 return BuildMemberInitializer(Member, Init, IdLoc); 2082 } 2083 } 2084 } 2085 // It didn't name a member, so see if it names a class. 2086 QualType BaseType; 2087 TypeSourceInfo *TInfo = 0; 2088 2089 if (TemplateTypeTy) { 2090 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 2091 } else if (DS.getTypeSpecType() == TST_decltype) { 2092 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 2093 } else { 2094 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 2095 LookupParsedName(R, S, &SS); 2096 2097 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 2098 if (!TyD) { 2099 if (R.isAmbiguous()) return true; 2100 2101 // We don't want access-control diagnostics here. 2102 R.suppressDiagnostics(); 2103 2104 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 2105 bool NotUnknownSpecialization = false; 2106 DeclContext *DC = computeDeclContext(SS, false); 2107 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 2108 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 2109 2110 if (!NotUnknownSpecialization) { 2111 // When the scope specifier can refer to a member of an unknown 2112 // specialization, we take it as a type name. 2113 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 2114 SS.getWithLocInContext(Context), 2115 *MemberOrBase, IdLoc); 2116 if (BaseType.isNull()) 2117 return true; 2118 2119 R.clear(); 2120 R.setLookupName(MemberOrBase); 2121 } 2122 } 2123 2124 // If no results were found, try to correct typos. 2125 TypoCorrection Corr; 2126 MemInitializerValidatorCCC Validator(ClassDecl); 2127 if (R.empty() && BaseType.isNull() && 2128 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 2129 Validator, ClassDecl))) { 2130 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 2131 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 2132 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 2133 // We have found a non-static data member with a similar 2134 // name to what was typed; complain and initialize that 2135 // member. 2136 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2137 << MemberOrBase << true << CorrectedQuotedStr 2138 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2139 Diag(Member->getLocation(), diag::note_previous_decl) 2140 << CorrectedQuotedStr; 2141 2142 return BuildMemberInitializer(Member, Init, IdLoc); 2143 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 2144 const CXXBaseSpecifier *DirectBaseSpec; 2145 const CXXBaseSpecifier *VirtualBaseSpec; 2146 if (FindBaseInitializer(*this, ClassDecl, 2147 Context.getTypeDeclType(Type), 2148 DirectBaseSpec, VirtualBaseSpec)) { 2149 // We have found a direct or virtual base class with a 2150 // similar name to what was typed; complain and initialize 2151 // that base class. 2152 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2153 << MemberOrBase << false << CorrectedQuotedStr 2154 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2155 2156 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 2157 : VirtualBaseSpec; 2158 Diag(BaseSpec->getLocStart(), 2159 diag::note_base_class_specified_here) 2160 << BaseSpec->getType() 2161 << BaseSpec->getSourceRange(); 2162 2163 TyD = Type; 2164 } 2165 } 2166 } 2167 2168 if (!TyD && BaseType.isNull()) { 2169 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 2170 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 2171 return true; 2172 } 2173 } 2174 2175 if (BaseType.isNull()) { 2176 BaseType = Context.getTypeDeclType(TyD); 2177 if (SS.isSet()) { 2178 NestedNameSpecifier *Qualifier = 2179 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2180 2181 // FIXME: preserve source range information 2182 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 2183 } 2184 } 2185 } 2186 2187 if (!TInfo) 2188 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 2189 2190 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 2191} 2192 2193/// Checks a member initializer expression for cases where reference (or 2194/// pointer) members are bound to by-value parameters (or their addresses). 2195static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 2196 Expr *Init, 2197 SourceLocation IdLoc) { 2198 QualType MemberTy = Member->getType(); 2199 2200 // We only handle pointers and references currently. 2201 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 2202 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 2203 return; 2204 2205 const bool IsPointer = MemberTy->isPointerType(); 2206 if (IsPointer) { 2207 if (const UnaryOperator *Op 2208 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2209 // The only case we're worried about with pointers requires taking the 2210 // address. 2211 if (Op->getOpcode() != UO_AddrOf) 2212 return; 2213 2214 Init = Op->getSubExpr(); 2215 } else { 2216 // We only handle address-of expression initializers for pointers. 2217 return; 2218 } 2219 } 2220 2221 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 2222 // Taking the address of a temporary will be diagnosed as a hard error. 2223 if (IsPointer) 2224 return; 2225 2226 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 2227 << Member << Init->getSourceRange(); 2228 } else if (const DeclRefExpr *DRE 2229 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2230 // We only warn when referring to a non-reference parameter declaration. 2231 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2232 if (!Parameter || Parameter->getType()->isReferenceType()) 2233 return; 2234 2235 S.Diag(Init->getExprLoc(), 2236 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2237 : diag::warn_bind_ref_member_to_parameter) 2238 << Member << Parameter << Init->getSourceRange(); 2239 } else { 2240 // Other initializers are fine. 2241 return; 2242 } 2243 2244 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2245 << (unsigned)IsPointer; 2246} 2247 2248MemInitResult 2249Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2250 SourceLocation IdLoc) { 2251 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2252 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2253 assert((DirectMember || IndirectMember) && 2254 "Member must be a FieldDecl or IndirectFieldDecl"); 2255 2256 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2257 return true; 2258 2259 if (Member->isInvalidDecl()) 2260 return true; 2261 2262 // Diagnose value-uses of fields to initialize themselves, e.g. 2263 // foo(foo) 2264 // where foo is not also a parameter to the constructor. 2265 // TODO: implement -Wuninitialized and fold this into that framework. 2266 Expr **Args; 2267 unsigned NumArgs; 2268 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2269 Args = ParenList->getExprs(); 2270 NumArgs = ParenList->getNumExprs(); 2271 } else { 2272 InitListExpr *InitList = cast<InitListExpr>(Init); 2273 Args = InitList->getInits(); 2274 NumArgs = InitList->getNumInits(); 2275 } 2276 2277 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc) 2278 != DiagnosticsEngine::Ignored) 2279 for (unsigned i = 0; i < NumArgs; ++i) 2280 // FIXME: Warn about the case when other fields are used before being 2281 // initialized. For example, let this field be the i'th field. When 2282 // initializing the i'th field, throw a warning if any of the >= i'th 2283 // fields are used, as they are not yet initialized. 2284 // Right now we are only handling the case where the i'th field uses 2285 // itself in its initializer. 2286 // Also need to take into account that some fields may be initialized by 2287 // in-class initializers, see C++11 [class.base.init]p9. 2288 CheckInitExprContainsUninitializedFields(*this, Args[i], Member); 2289 2290 SourceRange InitRange = Init->getSourceRange(); 2291 2292 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2293 // Can't check initialization for a member of dependent type or when 2294 // any of the arguments are type-dependent expressions. 2295 DiscardCleanupsInEvaluationContext(); 2296 } else { 2297 bool InitList = false; 2298 if (isa<InitListExpr>(Init)) { 2299 InitList = true; 2300 Args = &Init; 2301 NumArgs = 1; 2302 2303 if (isStdInitializerList(Member->getType(), 0)) { 2304 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2305 << /*at end of ctor*/1 << InitRange; 2306 } 2307 } 2308 2309 // Initialize the member. 2310 InitializedEntity MemberEntity = 2311 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2312 : InitializedEntity::InitializeMember(IndirectMember, 0); 2313 InitializationKind Kind = 2314 InitList ? InitializationKind::CreateDirectList(IdLoc) 2315 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2316 InitRange.getEnd()); 2317 2318 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2319 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2320 MultiExprArg(Args, NumArgs), 2321 0); 2322 if (MemberInit.isInvalid()) 2323 return true; 2324 2325 CheckImplicitConversions(MemberInit.get(), 2326 InitRange.getBegin()); 2327 2328 // C++0x [class.base.init]p7: 2329 // The initialization of each base and member constitutes a 2330 // full-expression. 2331 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2332 if (MemberInit.isInvalid()) 2333 return true; 2334 2335 // If we are in a dependent context, template instantiation will 2336 // perform this type-checking again. Just save the arguments that we 2337 // received. 2338 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2339 // of the information that we have about the member 2340 // initializer. However, deconstructing the ASTs is a dicey process, 2341 // and this approach is far more likely to get the corner cases right. 2342 if (CurContext->isDependentContext()) { 2343 // The existing Init will do fine. 2344 } else { 2345 Init = MemberInit.get(); 2346 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2347 } 2348 } 2349 2350 if (DirectMember) { 2351 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2352 InitRange.getBegin(), Init, 2353 InitRange.getEnd()); 2354 } else { 2355 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2356 InitRange.getBegin(), Init, 2357 InitRange.getEnd()); 2358 } 2359} 2360 2361MemInitResult 2362Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2363 CXXRecordDecl *ClassDecl) { 2364 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2365 if (!LangOpts.CPlusPlus0x) 2366 return Diag(NameLoc, diag::err_delegating_ctor) 2367 << TInfo->getTypeLoc().getLocalSourceRange(); 2368 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2369 2370 bool InitList = true; 2371 Expr **Args = &Init; 2372 unsigned NumArgs = 1; 2373 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2374 InitList = false; 2375 Args = ParenList->getExprs(); 2376 NumArgs = ParenList->getNumExprs(); 2377 } 2378 2379 SourceRange InitRange = Init->getSourceRange(); 2380 // Initialize the object. 2381 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2382 QualType(ClassDecl->getTypeForDecl(), 0)); 2383 InitializationKind Kind = 2384 InitList ? InitializationKind::CreateDirectList(NameLoc) 2385 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2386 InitRange.getEnd()); 2387 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2388 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2389 MultiExprArg(Args, NumArgs), 2390 0); 2391 if (DelegationInit.isInvalid()) 2392 return true; 2393 2394 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2395 "Delegating constructor with no target?"); 2396 2397 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2398 2399 // C++0x [class.base.init]p7: 2400 // The initialization of each base and member constitutes a 2401 // full-expression. 2402 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2403 if (DelegationInit.isInvalid()) 2404 return true; 2405 2406 // If we are in a dependent context, template instantiation will 2407 // perform this type-checking again. Just save the arguments that we 2408 // received in a ParenListExpr. 2409 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2410 // of the information that we have about the base 2411 // initializer. However, deconstructing the ASTs is a dicey process, 2412 // and this approach is far more likely to get the corner cases right. 2413 if (CurContext->isDependentContext()) 2414 DelegationInit = Owned(Init); 2415 2416 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2417 DelegationInit.takeAs<Expr>(), 2418 InitRange.getEnd()); 2419} 2420 2421MemInitResult 2422Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2423 Expr *Init, CXXRecordDecl *ClassDecl, 2424 SourceLocation EllipsisLoc) { 2425 SourceLocation BaseLoc 2426 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2427 2428 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2429 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2430 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2431 2432 // C++ [class.base.init]p2: 2433 // [...] Unless the mem-initializer-id names a nonstatic data 2434 // member of the constructor's class or a direct or virtual base 2435 // of that class, the mem-initializer is ill-formed. A 2436 // mem-initializer-list can initialize a base class using any 2437 // name that denotes that base class type. 2438 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2439 2440 SourceRange InitRange = Init->getSourceRange(); 2441 if (EllipsisLoc.isValid()) { 2442 // This is a pack expansion. 2443 if (!BaseType->containsUnexpandedParameterPack()) { 2444 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2445 << SourceRange(BaseLoc, InitRange.getEnd()); 2446 2447 EllipsisLoc = SourceLocation(); 2448 } 2449 } else { 2450 // Check for any unexpanded parameter packs. 2451 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2452 return true; 2453 2454 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2455 return true; 2456 } 2457 2458 // Check for direct and virtual base classes. 2459 const CXXBaseSpecifier *DirectBaseSpec = 0; 2460 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2461 if (!Dependent) { 2462 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2463 BaseType)) 2464 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2465 2466 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2467 VirtualBaseSpec); 2468 2469 // C++ [base.class.init]p2: 2470 // Unless the mem-initializer-id names a nonstatic data member of the 2471 // constructor's class or a direct or virtual base of that class, the 2472 // mem-initializer is ill-formed. 2473 if (!DirectBaseSpec && !VirtualBaseSpec) { 2474 // If the class has any dependent bases, then it's possible that 2475 // one of those types will resolve to the same type as 2476 // BaseType. Therefore, just treat this as a dependent base 2477 // class initialization. FIXME: Should we try to check the 2478 // initialization anyway? It seems odd. 2479 if (ClassDecl->hasAnyDependentBases()) 2480 Dependent = true; 2481 else 2482 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2483 << BaseType << Context.getTypeDeclType(ClassDecl) 2484 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2485 } 2486 } 2487 2488 if (Dependent) { 2489 DiscardCleanupsInEvaluationContext(); 2490 2491 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2492 /*IsVirtual=*/false, 2493 InitRange.getBegin(), Init, 2494 InitRange.getEnd(), EllipsisLoc); 2495 } 2496 2497 // C++ [base.class.init]p2: 2498 // If a mem-initializer-id is ambiguous because it designates both 2499 // a direct non-virtual base class and an inherited virtual base 2500 // class, the mem-initializer is ill-formed. 2501 if (DirectBaseSpec && VirtualBaseSpec) 2502 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2503 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2504 2505 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2506 if (!BaseSpec) 2507 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2508 2509 // Initialize the base. 2510 bool InitList = true; 2511 Expr **Args = &Init; 2512 unsigned NumArgs = 1; 2513 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2514 InitList = false; 2515 Args = ParenList->getExprs(); 2516 NumArgs = ParenList->getNumExprs(); 2517 } 2518 2519 InitializedEntity BaseEntity = 2520 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2521 InitializationKind Kind = 2522 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2523 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2524 InitRange.getEnd()); 2525 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2526 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2527 MultiExprArg(Args, NumArgs), 0); 2528 if (BaseInit.isInvalid()) 2529 return true; 2530 2531 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2532 2533 // C++0x [class.base.init]p7: 2534 // The initialization of each base and member constitutes a 2535 // full-expression. 2536 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2537 if (BaseInit.isInvalid()) 2538 return true; 2539 2540 // If we are in a dependent context, template instantiation will 2541 // perform this type-checking again. Just save the arguments that we 2542 // received in a ParenListExpr. 2543 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2544 // of the information that we have about the base 2545 // initializer. However, deconstructing the ASTs is a dicey process, 2546 // and this approach is far more likely to get the corner cases right. 2547 if (CurContext->isDependentContext()) 2548 BaseInit = Owned(Init); 2549 2550 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2551 BaseSpec->isVirtual(), 2552 InitRange.getBegin(), 2553 BaseInit.takeAs<Expr>(), 2554 InitRange.getEnd(), EllipsisLoc); 2555} 2556 2557// Create a static_cast\<T&&>(expr). 2558static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2559 QualType ExprType = E->getType(); 2560 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2561 SourceLocation ExprLoc = E->getLocStart(); 2562 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2563 TargetType, ExprLoc); 2564 2565 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2566 SourceRange(ExprLoc, ExprLoc), 2567 E->getSourceRange()).take(); 2568} 2569 2570/// ImplicitInitializerKind - How an implicit base or member initializer should 2571/// initialize its base or member. 2572enum ImplicitInitializerKind { 2573 IIK_Default, 2574 IIK_Copy, 2575 IIK_Move 2576}; 2577 2578static bool 2579BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2580 ImplicitInitializerKind ImplicitInitKind, 2581 CXXBaseSpecifier *BaseSpec, 2582 bool IsInheritedVirtualBase, 2583 CXXCtorInitializer *&CXXBaseInit) { 2584 InitializedEntity InitEntity 2585 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2586 IsInheritedVirtualBase); 2587 2588 ExprResult BaseInit; 2589 2590 switch (ImplicitInitKind) { 2591 case IIK_Default: { 2592 InitializationKind InitKind 2593 = InitializationKind::CreateDefault(Constructor->getLocation()); 2594 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2595 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2596 break; 2597 } 2598 2599 case IIK_Move: 2600 case IIK_Copy: { 2601 bool Moving = ImplicitInitKind == IIK_Move; 2602 ParmVarDecl *Param = Constructor->getParamDecl(0); 2603 QualType ParamType = Param->getType().getNonReferenceType(); 2604 2605 Expr *CopyCtorArg = 2606 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2607 SourceLocation(), Param, false, 2608 Constructor->getLocation(), ParamType, 2609 VK_LValue, 0); 2610 2611 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2612 2613 // Cast to the base class to avoid ambiguities. 2614 QualType ArgTy = 2615 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2616 ParamType.getQualifiers()); 2617 2618 if (Moving) { 2619 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2620 } 2621 2622 CXXCastPath BasePath; 2623 BasePath.push_back(BaseSpec); 2624 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2625 CK_UncheckedDerivedToBase, 2626 Moving ? VK_XValue : VK_LValue, 2627 &BasePath).take(); 2628 2629 InitializationKind InitKind 2630 = InitializationKind::CreateDirect(Constructor->getLocation(), 2631 SourceLocation(), SourceLocation()); 2632 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2633 &CopyCtorArg, 1); 2634 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2635 MultiExprArg(&CopyCtorArg, 1)); 2636 break; 2637 } 2638 } 2639 2640 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2641 if (BaseInit.isInvalid()) 2642 return true; 2643 2644 CXXBaseInit = 2645 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2646 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2647 SourceLocation()), 2648 BaseSpec->isVirtual(), 2649 SourceLocation(), 2650 BaseInit.takeAs<Expr>(), 2651 SourceLocation(), 2652 SourceLocation()); 2653 2654 return false; 2655} 2656 2657static bool RefersToRValueRef(Expr *MemRef) { 2658 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2659 return Referenced->getType()->isRValueReferenceType(); 2660} 2661 2662static bool 2663BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2664 ImplicitInitializerKind ImplicitInitKind, 2665 FieldDecl *Field, IndirectFieldDecl *Indirect, 2666 CXXCtorInitializer *&CXXMemberInit) { 2667 if (Field->isInvalidDecl()) 2668 return true; 2669 2670 SourceLocation Loc = Constructor->getLocation(); 2671 2672 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2673 bool Moving = ImplicitInitKind == IIK_Move; 2674 ParmVarDecl *Param = Constructor->getParamDecl(0); 2675 QualType ParamType = Param->getType().getNonReferenceType(); 2676 2677 // Suppress copying zero-width bitfields. 2678 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2679 return false; 2680 2681 Expr *MemberExprBase = 2682 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2683 SourceLocation(), Param, false, 2684 Loc, ParamType, VK_LValue, 0); 2685 2686 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2687 2688 if (Moving) { 2689 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2690 } 2691 2692 // Build a reference to this field within the parameter. 2693 CXXScopeSpec SS; 2694 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2695 Sema::LookupMemberName); 2696 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2697 : cast<ValueDecl>(Field), AS_public); 2698 MemberLookup.resolveKind(); 2699 ExprResult CtorArg 2700 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2701 ParamType, Loc, 2702 /*IsArrow=*/false, 2703 SS, 2704 /*TemplateKWLoc=*/SourceLocation(), 2705 /*FirstQualifierInScope=*/0, 2706 MemberLookup, 2707 /*TemplateArgs=*/0); 2708 if (CtorArg.isInvalid()) 2709 return true; 2710 2711 // C++11 [class.copy]p15: 2712 // - if a member m has rvalue reference type T&&, it is direct-initialized 2713 // with static_cast<T&&>(x.m); 2714 if (RefersToRValueRef(CtorArg.get())) { 2715 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2716 } 2717 2718 // When the field we are copying is an array, create index variables for 2719 // each dimension of the array. We use these index variables to subscript 2720 // the source array, and other clients (e.g., CodeGen) will perform the 2721 // necessary iteration with these index variables. 2722 SmallVector<VarDecl *, 4> IndexVariables; 2723 QualType BaseType = Field->getType(); 2724 QualType SizeType = SemaRef.Context.getSizeType(); 2725 bool InitializingArray = false; 2726 while (const ConstantArrayType *Array 2727 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2728 InitializingArray = true; 2729 // Create the iteration variable for this array index. 2730 IdentifierInfo *IterationVarName = 0; 2731 { 2732 SmallString<8> Str; 2733 llvm::raw_svector_ostream OS(Str); 2734 OS << "__i" << IndexVariables.size(); 2735 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2736 } 2737 VarDecl *IterationVar 2738 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2739 IterationVarName, SizeType, 2740 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2741 SC_None, SC_None); 2742 IndexVariables.push_back(IterationVar); 2743 2744 // Create a reference to the iteration variable. 2745 ExprResult IterationVarRef 2746 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2747 assert(!IterationVarRef.isInvalid() && 2748 "Reference to invented variable cannot fail!"); 2749 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2750 assert(!IterationVarRef.isInvalid() && 2751 "Conversion of invented variable cannot fail!"); 2752 2753 // Subscript the array with this iteration variable. 2754 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2755 IterationVarRef.take(), 2756 Loc); 2757 if (CtorArg.isInvalid()) 2758 return true; 2759 2760 BaseType = Array->getElementType(); 2761 } 2762 2763 // The array subscript expression is an lvalue, which is wrong for moving. 2764 if (Moving && InitializingArray) 2765 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2766 2767 // Construct the entity that we will be initializing. For an array, this 2768 // will be first element in the array, which may require several levels 2769 // of array-subscript entities. 2770 SmallVector<InitializedEntity, 4> Entities; 2771 Entities.reserve(1 + IndexVariables.size()); 2772 if (Indirect) 2773 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2774 else 2775 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2776 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2777 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2778 0, 2779 Entities.back())); 2780 2781 // Direct-initialize to use the copy constructor. 2782 InitializationKind InitKind = 2783 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2784 2785 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2786 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2787 &CtorArgE, 1); 2788 2789 ExprResult MemberInit 2790 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2791 MultiExprArg(&CtorArgE, 1)); 2792 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2793 if (MemberInit.isInvalid()) 2794 return true; 2795 2796 if (Indirect) { 2797 assert(IndexVariables.size() == 0 && 2798 "Indirect field improperly initialized"); 2799 CXXMemberInit 2800 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2801 Loc, Loc, 2802 MemberInit.takeAs<Expr>(), 2803 Loc); 2804 } else 2805 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2806 Loc, MemberInit.takeAs<Expr>(), 2807 Loc, 2808 IndexVariables.data(), 2809 IndexVariables.size()); 2810 return false; 2811 } 2812 2813 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2814 2815 QualType FieldBaseElementType = 2816 SemaRef.Context.getBaseElementType(Field->getType()); 2817 2818 if (FieldBaseElementType->isRecordType()) { 2819 InitializedEntity InitEntity 2820 = Indirect? InitializedEntity::InitializeMember(Indirect) 2821 : InitializedEntity::InitializeMember(Field); 2822 InitializationKind InitKind = 2823 InitializationKind::CreateDefault(Loc); 2824 2825 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2826 ExprResult MemberInit = 2827 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2828 2829 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2830 if (MemberInit.isInvalid()) 2831 return true; 2832 2833 if (Indirect) 2834 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2835 Indirect, Loc, 2836 Loc, 2837 MemberInit.get(), 2838 Loc); 2839 else 2840 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2841 Field, Loc, Loc, 2842 MemberInit.get(), 2843 Loc); 2844 return false; 2845 } 2846 2847 if (!Field->getParent()->isUnion()) { 2848 if (FieldBaseElementType->isReferenceType()) { 2849 SemaRef.Diag(Constructor->getLocation(), 2850 diag::err_uninitialized_member_in_ctor) 2851 << (int)Constructor->isImplicit() 2852 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2853 << 0 << Field->getDeclName(); 2854 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2855 return true; 2856 } 2857 2858 if (FieldBaseElementType.isConstQualified()) { 2859 SemaRef.Diag(Constructor->getLocation(), 2860 diag::err_uninitialized_member_in_ctor) 2861 << (int)Constructor->isImplicit() 2862 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2863 << 1 << Field->getDeclName(); 2864 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2865 return true; 2866 } 2867 } 2868 2869 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2870 FieldBaseElementType->isObjCRetainableType() && 2871 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2872 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2873 // ARC: 2874 // Default-initialize Objective-C pointers to NULL. 2875 CXXMemberInit 2876 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2877 Loc, Loc, 2878 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2879 Loc); 2880 return false; 2881 } 2882 2883 // Nothing to initialize. 2884 CXXMemberInit = 0; 2885 return false; 2886} 2887 2888namespace { 2889struct BaseAndFieldInfo { 2890 Sema &S; 2891 CXXConstructorDecl *Ctor; 2892 bool AnyErrorsInInits; 2893 ImplicitInitializerKind IIK; 2894 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2895 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2896 2897 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2898 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2899 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2900 if (Generated && Ctor->isCopyConstructor()) 2901 IIK = IIK_Copy; 2902 else if (Generated && Ctor->isMoveConstructor()) 2903 IIK = IIK_Move; 2904 else 2905 IIK = IIK_Default; 2906 } 2907 2908 bool isImplicitCopyOrMove() const { 2909 switch (IIK) { 2910 case IIK_Copy: 2911 case IIK_Move: 2912 return true; 2913 2914 case IIK_Default: 2915 return false; 2916 } 2917 2918 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2919 } 2920 2921 bool addFieldInitializer(CXXCtorInitializer *Init) { 2922 AllToInit.push_back(Init); 2923 2924 // Check whether this initializer makes the field "used". 2925 if (Init->getInit() && Init->getInit()->HasSideEffects(S.Context)) 2926 S.UnusedPrivateFields.remove(Init->getAnyMember()); 2927 2928 return false; 2929 } 2930}; 2931} 2932 2933/// \brief Determine whether the given indirect field declaration is somewhere 2934/// within an anonymous union. 2935static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2936 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2937 CEnd = F->chain_end(); 2938 C != CEnd; ++C) 2939 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2940 if (Record->isUnion()) 2941 return true; 2942 2943 return false; 2944} 2945 2946/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2947/// array type. 2948static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2949 if (T->isIncompleteArrayType()) 2950 return true; 2951 2952 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2953 if (!ArrayT->getSize()) 2954 return true; 2955 2956 T = ArrayT->getElementType(); 2957 } 2958 2959 return false; 2960} 2961 2962static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2963 FieldDecl *Field, 2964 IndirectFieldDecl *Indirect = 0) { 2965 2966 // Overwhelmingly common case: we have a direct initializer for this field. 2967 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) 2968 return Info.addFieldInitializer(Init); 2969 2970 // C++11 [class.base.init]p8: if the entity is a non-static data member that 2971 // has a brace-or-equal-initializer, the entity is initialized as specified 2972 // in [dcl.init]. 2973 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2974 CXXCtorInitializer *Init; 2975 if (Indirect) 2976 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2977 SourceLocation(), 2978 SourceLocation(), 0, 2979 SourceLocation()); 2980 else 2981 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2982 SourceLocation(), 2983 SourceLocation(), 0, 2984 SourceLocation()); 2985 return Info.addFieldInitializer(Init); 2986 } 2987 2988 // Don't build an implicit initializer for union members if none was 2989 // explicitly specified. 2990 if (Field->getParent()->isUnion() || 2991 (Indirect && isWithinAnonymousUnion(Indirect))) 2992 return false; 2993 2994 // Don't initialize incomplete or zero-length arrays. 2995 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2996 return false; 2997 2998 // Don't try to build an implicit initializer if there were semantic 2999 // errors in any of the initializers (and therefore we might be 3000 // missing some that the user actually wrote). 3001 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 3002 return false; 3003 3004 CXXCtorInitializer *Init = 0; 3005 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 3006 Indirect, Init)) 3007 return true; 3008 3009 if (!Init) 3010 return false; 3011 3012 return Info.addFieldInitializer(Init); 3013} 3014 3015bool 3016Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 3017 CXXCtorInitializer *Initializer) { 3018 assert(Initializer->isDelegatingInitializer()); 3019 Constructor->setNumCtorInitializers(1); 3020 CXXCtorInitializer **initializer = 3021 new (Context) CXXCtorInitializer*[1]; 3022 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 3023 Constructor->setCtorInitializers(initializer); 3024 3025 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 3026 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 3027 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 3028 } 3029 3030 DelegatingCtorDecls.push_back(Constructor); 3031 3032 return false; 3033} 3034 3035bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 3036 CXXCtorInitializer **Initializers, 3037 unsigned NumInitializers, 3038 bool AnyErrors) { 3039 if (Constructor->isDependentContext()) { 3040 // Just store the initializers as written, they will be checked during 3041 // instantiation. 3042 if (NumInitializers > 0) { 3043 Constructor->setNumCtorInitializers(NumInitializers); 3044 CXXCtorInitializer **baseOrMemberInitializers = 3045 new (Context) CXXCtorInitializer*[NumInitializers]; 3046 memcpy(baseOrMemberInitializers, Initializers, 3047 NumInitializers * sizeof(CXXCtorInitializer*)); 3048 Constructor->setCtorInitializers(baseOrMemberInitializers); 3049 } 3050 3051 // Let template instantiation know whether we had errors. 3052 if (AnyErrors) 3053 Constructor->setInvalidDecl(); 3054 3055 return false; 3056 } 3057 3058 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 3059 3060 // We need to build the initializer AST according to order of construction 3061 // and not what user specified in the Initializers list. 3062 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 3063 if (!ClassDecl) 3064 return true; 3065 3066 bool HadError = false; 3067 3068 for (unsigned i = 0; i < NumInitializers; i++) { 3069 CXXCtorInitializer *Member = Initializers[i]; 3070 3071 if (Member->isBaseInitializer()) 3072 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 3073 else 3074 Info.AllBaseFields[Member->getAnyMember()] = Member; 3075 } 3076 3077 // Keep track of the direct virtual bases. 3078 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 3079 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 3080 E = ClassDecl->bases_end(); I != E; ++I) { 3081 if (I->isVirtual()) 3082 DirectVBases.insert(I); 3083 } 3084 3085 // Push virtual bases before others. 3086 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3087 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3088 3089 if (CXXCtorInitializer *Value 3090 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 3091 Info.AllToInit.push_back(Value); 3092 } else if (!AnyErrors) { 3093 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 3094 CXXCtorInitializer *CXXBaseInit; 3095 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3096 VBase, IsInheritedVirtualBase, 3097 CXXBaseInit)) { 3098 HadError = true; 3099 continue; 3100 } 3101 3102 Info.AllToInit.push_back(CXXBaseInit); 3103 } 3104 } 3105 3106 // Non-virtual bases. 3107 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3108 E = ClassDecl->bases_end(); Base != E; ++Base) { 3109 // Virtuals are in the virtual base list and already constructed. 3110 if (Base->isVirtual()) 3111 continue; 3112 3113 if (CXXCtorInitializer *Value 3114 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3115 Info.AllToInit.push_back(Value); 3116 } else if (!AnyErrors) { 3117 CXXCtorInitializer *CXXBaseInit; 3118 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3119 Base, /*IsInheritedVirtualBase=*/false, 3120 CXXBaseInit)) { 3121 HadError = true; 3122 continue; 3123 } 3124 3125 Info.AllToInit.push_back(CXXBaseInit); 3126 } 3127 } 3128 3129 // Fields. 3130 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3131 MemEnd = ClassDecl->decls_end(); 3132 Mem != MemEnd; ++Mem) { 3133 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3134 // C++ [class.bit]p2: 3135 // A declaration for a bit-field that omits the identifier declares an 3136 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3137 // initialized. 3138 if (F->isUnnamedBitfield()) 3139 continue; 3140 3141 // If we're not generating the implicit copy/move constructor, then we'll 3142 // handle anonymous struct/union fields based on their individual 3143 // indirect fields. 3144 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 3145 continue; 3146 3147 if (CollectFieldInitializer(*this, Info, F)) 3148 HadError = true; 3149 continue; 3150 } 3151 3152 // Beyond this point, we only consider default initialization. 3153 if (Info.IIK != IIK_Default) 3154 continue; 3155 3156 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3157 if (F->getType()->isIncompleteArrayType()) { 3158 assert(ClassDecl->hasFlexibleArrayMember() && 3159 "Incomplete array type is not valid"); 3160 continue; 3161 } 3162 3163 // Initialize each field of an anonymous struct individually. 3164 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3165 HadError = true; 3166 3167 continue; 3168 } 3169 } 3170 3171 NumInitializers = Info.AllToInit.size(); 3172 if (NumInitializers > 0) { 3173 Constructor->setNumCtorInitializers(NumInitializers); 3174 CXXCtorInitializer **baseOrMemberInitializers = 3175 new (Context) CXXCtorInitializer*[NumInitializers]; 3176 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3177 NumInitializers * sizeof(CXXCtorInitializer*)); 3178 Constructor->setCtorInitializers(baseOrMemberInitializers); 3179 3180 // Constructors implicitly reference the base and member 3181 // destructors. 3182 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3183 Constructor->getParent()); 3184 } 3185 3186 return HadError; 3187} 3188 3189static void *GetKeyForTopLevelField(FieldDecl *Field) { 3190 // For anonymous unions, use the class declaration as the key. 3191 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3192 if (RT->getDecl()->isAnonymousStructOrUnion()) 3193 return static_cast<void *>(RT->getDecl()); 3194 } 3195 return static_cast<void *>(Field); 3196} 3197 3198static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3199 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3200} 3201 3202static void *GetKeyForMember(ASTContext &Context, 3203 CXXCtorInitializer *Member) { 3204 if (!Member->isAnyMemberInitializer()) 3205 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3206 3207 // For fields injected into the class via declaration of an anonymous union, 3208 // use its anonymous union class declaration as the unique key. 3209 FieldDecl *Field = Member->getAnyMember(); 3210 3211 // If the field is a member of an anonymous struct or union, our key 3212 // is the anonymous record decl that's a direct child of the class. 3213 RecordDecl *RD = Field->getParent(); 3214 if (RD->isAnonymousStructOrUnion()) { 3215 while (true) { 3216 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3217 if (Parent->isAnonymousStructOrUnion()) 3218 RD = Parent; 3219 else 3220 break; 3221 } 3222 3223 return static_cast<void *>(RD); 3224 } 3225 3226 return static_cast<void *>(Field); 3227} 3228 3229static void 3230DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3231 const CXXConstructorDecl *Constructor, 3232 CXXCtorInitializer **Inits, 3233 unsigned NumInits) { 3234 if (Constructor->getDeclContext()->isDependentContext()) 3235 return; 3236 3237 // Don't check initializers order unless the warning is enabled at the 3238 // location of at least one initializer. 3239 bool ShouldCheckOrder = false; 3240 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3241 CXXCtorInitializer *Init = Inits[InitIndex]; 3242 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3243 Init->getSourceLocation()) 3244 != DiagnosticsEngine::Ignored) { 3245 ShouldCheckOrder = true; 3246 break; 3247 } 3248 } 3249 if (!ShouldCheckOrder) 3250 return; 3251 3252 // Build the list of bases and members in the order that they'll 3253 // actually be initialized. The explicit initializers should be in 3254 // this same order but may be missing things. 3255 SmallVector<const void*, 32> IdealInitKeys; 3256 3257 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3258 3259 // 1. Virtual bases. 3260 for (CXXRecordDecl::base_class_const_iterator VBase = 3261 ClassDecl->vbases_begin(), 3262 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3263 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3264 3265 // 2. Non-virtual bases. 3266 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3267 E = ClassDecl->bases_end(); Base != E; ++Base) { 3268 if (Base->isVirtual()) 3269 continue; 3270 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3271 } 3272 3273 // 3. Direct fields. 3274 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3275 E = ClassDecl->field_end(); Field != E; ++Field) { 3276 if (Field->isUnnamedBitfield()) 3277 continue; 3278 3279 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3280 } 3281 3282 unsigned NumIdealInits = IdealInitKeys.size(); 3283 unsigned IdealIndex = 0; 3284 3285 CXXCtorInitializer *PrevInit = 0; 3286 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3287 CXXCtorInitializer *Init = Inits[InitIndex]; 3288 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3289 3290 // Scan forward to try to find this initializer in the idealized 3291 // initializers list. 3292 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3293 if (InitKey == IdealInitKeys[IdealIndex]) 3294 break; 3295 3296 // If we didn't find this initializer, it must be because we 3297 // scanned past it on a previous iteration. That can only 3298 // happen if we're out of order; emit a warning. 3299 if (IdealIndex == NumIdealInits && PrevInit) { 3300 Sema::SemaDiagnosticBuilder D = 3301 SemaRef.Diag(PrevInit->getSourceLocation(), 3302 diag::warn_initializer_out_of_order); 3303 3304 if (PrevInit->isAnyMemberInitializer()) 3305 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3306 else 3307 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3308 3309 if (Init->isAnyMemberInitializer()) 3310 D << 0 << Init->getAnyMember()->getDeclName(); 3311 else 3312 D << 1 << Init->getTypeSourceInfo()->getType(); 3313 3314 // Move back to the initializer's location in the ideal list. 3315 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3316 if (InitKey == IdealInitKeys[IdealIndex]) 3317 break; 3318 3319 assert(IdealIndex != NumIdealInits && 3320 "initializer not found in initializer list"); 3321 } 3322 3323 PrevInit = Init; 3324 } 3325} 3326 3327namespace { 3328bool CheckRedundantInit(Sema &S, 3329 CXXCtorInitializer *Init, 3330 CXXCtorInitializer *&PrevInit) { 3331 if (!PrevInit) { 3332 PrevInit = Init; 3333 return false; 3334 } 3335 3336 if (FieldDecl *Field = Init->getMember()) 3337 S.Diag(Init->getSourceLocation(), 3338 diag::err_multiple_mem_initialization) 3339 << Field->getDeclName() 3340 << Init->getSourceRange(); 3341 else { 3342 const Type *BaseClass = Init->getBaseClass(); 3343 assert(BaseClass && "neither field nor base"); 3344 S.Diag(Init->getSourceLocation(), 3345 diag::err_multiple_base_initialization) 3346 << QualType(BaseClass, 0) 3347 << Init->getSourceRange(); 3348 } 3349 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3350 << 0 << PrevInit->getSourceRange(); 3351 3352 return true; 3353} 3354 3355typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3356typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3357 3358bool CheckRedundantUnionInit(Sema &S, 3359 CXXCtorInitializer *Init, 3360 RedundantUnionMap &Unions) { 3361 FieldDecl *Field = Init->getAnyMember(); 3362 RecordDecl *Parent = Field->getParent(); 3363 NamedDecl *Child = Field; 3364 3365 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3366 if (Parent->isUnion()) { 3367 UnionEntry &En = Unions[Parent]; 3368 if (En.first && En.first != Child) { 3369 S.Diag(Init->getSourceLocation(), 3370 diag::err_multiple_mem_union_initialization) 3371 << Field->getDeclName() 3372 << Init->getSourceRange(); 3373 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3374 << 0 << En.second->getSourceRange(); 3375 return true; 3376 } 3377 if (!En.first) { 3378 En.first = Child; 3379 En.second = Init; 3380 } 3381 if (!Parent->isAnonymousStructOrUnion()) 3382 return false; 3383 } 3384 3385 Child = Parent; 3386 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3387 } 3388 3389 return false; 3390} 3391} 3392 3393/// ActOnMemInitializers - Handle the member initializers for a constructor. 3394void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3395 SourceLocation ColonLoc, 3396 CXXCtorInitializer **meminits, 3397 unsigned NumMemInits, 3398 bool AnyErrors) { 3399 if (!ConstructorDecl) 3400 return; 3401 3402 AdjustDeclIfTemplate(ConstructorDecl); 3403 3404 CXXConstructorDecl *Constructor 3405 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3406 3407 if (!Constructor) { 3408 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3409 return; 3410 } 3411 3412 CXXCtorInitializer **MemInits = 3413 reinterpret_cast<CXXCtorInitializer **>(meminits); 3414 3415 // Mapping for the duplicate initializers check. 3416 // For member initializers, this is keyed with a FieldDecl*. 3417 // For base initializers, this is keyed with a Type*. 3418 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3419 3420 // Mapping for the inconsistent anonymous-union initializers check. 3421 RedundantUnionMap MemberUnions; 3422 3423 bool HadError = false; 3424 for (unsigned i = 0; i < NumMemInits; i++) { 3425 CXXCtorInitializer *Init = MemInits[i]; 3426 3427 // Set the source order index. 3428 Init->setSourceOrder(i); 3429 3430 if (Init->isAnyMemberInitializer()) { 3431 FieldDecl *Field = Init->getAnyMember(); 3432 if (CheckRedundantInit(*this, Init, Members[Field]) || 3433 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3434 HadError = true; 3435 } else if (Init->isBaseInitializer()) { 3436 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3437 if (CheckRedundantInit(*this, Init, Members[Key])) 3438 HadError = true; 3439 } else { 3440 assert(Init->isDelegatingInitializer()); 3441 // This must be the only initializer 3442 if (NumMemInits != 1) { 3443 Diag(Init->getSourceLocation(), 3444 diag::err_delegating_initializer_alone) 3445 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange(); 3446 // We will treat this as being the only initializer. 3447 } 3448 SetDelegatingInitializer(Constructor, MemInits[i]); 3449 // Return immediately as the initializer is set. 3450 return; 3451 } 3452 } 3453 3454 if (HadError) 3455 return; 3456 3457 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3458 3459 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3460} 3461 3462void 3463Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3464 CXXRecordDecl *ClassDecl) { 3465 // Ignore dependent contexts. Also ignore unions, since their members never 3466 // have destructors implicitly called. 3467 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3468 return; 3469 3470 // FIXME: all the access-control diagnostics are positioned on the 3471 // field/base declaration. That's probably good; that said, the 3472 // user might reasonably want to know why the destructor is being 3473 // emitted, and we currently don't say. 3474 3475 // Non-static data members. 3476 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3477 E = ClassDecl->field_end(); I != E; ++I) { 3478 FieldDecl *Field = *I; 3479 if (Field->isInvalidDecl()) 3480 continue; 3481 3482 // Don't destroy incomplete or zero-length arrays. 3483 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3484 continue; 3485 3486 QualType FieldType = Context.getBaseElementType(Field->getType()); 3487 3488 const RecordType* RT = FieldType->getAs<RecordType>(); 3489 if (!RT) 3490 continue; 3491 3492 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3493 if (FieldClassDecl->isInvalidDecl()) 3494 continue; 3495 if (FieldClassDecl->hasIrrelevantDestructor()) 3496 continue; 3497 // The destructor for an implicit anonymous union member is never invoked. 3498 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3499 continue; 3500 3501 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3502 assert(Dtor && "No dtor found for FieldClassDecl!"); 3503 CheckDestructorAccess(Field->getLocation(), Dtor, 3504 PDiag(diag::err_access_dtor_field) 3505 << Field->getDeclName() 3506 << FieldType); 3507 3508 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3509 DiagnoseUseOfDecl(Dtor, Location); 3510 } 3511 3512 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3513 3514 // Bases. 3515 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3516 E = ClassDecl->bases_end(); Base != E; ++Base) { 3517 // Bases are always records in a well-formed non-dependent class. 3518 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3519 3520 // Remember direct virtual bases. 3521 if (Base->isVirtual()) 3522 DirectVirtualBases.insert(RT); 3523 3524 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3525 // If our base class is invalid, we probably can't get its dtor anyway. 3526 if (BaseClassDecl->isInvalidDecl()) 3527 continue; 3528 if (BaseClassDecl->hasIrrelevantDestructor()) 3529 continue; 3530 3531 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3532 assert(Dtor && "No dtor found for BaseClassDecl!"); 3533 3534 // FIXME: caret should be on the start of the class name 3535 CheckDestructorAccess(Base->getLocStart(), Dtor, 3536 PDiag(diag::err_access_dtor_base) 3537 << Base->getType() 3538 << Base->getSourceRange(), 3539 Context.getTypeDeclType(ClassDecl)); 3540 3541 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3542 DiagnoseUseOfDecl(Dtor, Location); 3543 } 3544 3545 // Virtual bases. 3546 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3547 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3548 3549 // Bases are always records in a well-formed non-dependent class. 3550 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3551 3552 // Ignore direct virtual bases. 3553 if (DirectVirtualBases.count(RT)) 3554 continue; 3555 3556 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3557 // If our base class is invalid, we probably can't get its dtor anyway. 3558 if (BaseClassDecl->isInvalidDecl()) 3559 continue; 3560 if (BaseClassDecl->hasIrrelevantDestructor()) 3561 continue; 3562 3563 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3564 assert(Dtor && "No dtor found for BaseClassDecl!"); 3565 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3566 PDiag(diag::err_access_dtor_vbase) 3567 << VBase->getType(), 3568 Context.getTypeDeclType(ClassDecl)); 3569 3570 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3571 DiagnoseUseOfDecl(Dtor, Location); 3572 } 3573} 3574 3575void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3576 if (!CDtorDecl) 3577 return; 3578 3579 if (CXXConstructorDecl *Constructor 3580 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3581 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3582} 3583 3584bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3585 unsigned DiagID, AbstractDiagSelID SelID) { 3586 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3587 unsigned DiagID; 3588 AbstractDiagSelID SelID; 3589 3590 public: 3591 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3592 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3593 3594 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 3595 if (Suppressed) return; 3596 if (SelID == -1) 3597 S.Diag(Loc, DiagID) << T; 3598 else 3599 S.Diag(Loc, DiagID) << SelID << T; 3600 } 3601 } Diagnoser(DiagID, SelID); 3602 3603 return RequireNonAbstractType(Loc, T, Diagnoser); 3604} 3605 3606bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3607 TypeDiagnoser &Diagnoser) { 3608 if (!getLangOpts().CPlusPlus) 3609 return false; 3610 3611 if (const ArrayType *AT = Context.getAsArrayType(T)) 3612 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3613 3614 if (const PointerType *PT = T->getAs<PointerType>()) { 3615 // Find the innermost pointer type. 3616 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3617 PT = T; 3618 3619 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3620 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3621 } 3622 3623 const RecordType *RT = T->getAs<RecordType>(); 3624 if (!RT) 3625 return false; 3626 3627 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3628 3629 // We can't answer whether something is abstract until it has a 3630 // definition. If it's currently being defined, we'll walk back 3631 // over all the declarations when we have a full definition. 3632 const CXXRecordDecl *Def = RD->getDefinition(); 3633 if (!Def || Def->isBeingDefined()) 3634 return false; 3635 3636 if (!RD->isAbstract()) 3637 return false; 3638 3639 Diagnoser.diagnose(*this, Loc, T); 3640 DiagnoseAbstractType(RD); 3641 3642 return true; 3643} 3644 3645void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3646 // Check if we've already emitted the list of pure virtual functions 3647 // for this class. 3648 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3649 return; 3650 3651 CXXFinalOverriderMap FinalOverriders; 3652 RD->getFinalOverriders(FinalOverriders); 3653 3654 // Keep a set of seen pure methods so we won't diagnose the same method 3655 // more than once. 3656 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3657 3658 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3659 MEnd = FinalOverriders.end(); 3660 M != MEnd; 3661 ++M) { 3662 for (OverridingMethods::iterator SO = M->second.begin(), 3663 SOEnd = M->second.end(); 3664 SO != SOEnd; ++SO) { 3665 // C++ [class.abstract]p4: 3666 // A class is abstract if it contains or inherits at least one 3667 // pure virtual function for which the final overrider is pure 3668 // virtual. 3669 3670 // 3671 if (SO->second.size() != 1) 3672 continue; 3673 3674 if (!SO->second.front().Method->isPure()) 3675 continue; 3676 3677 if (!SeenPureMethods.insert(SO->second.front().Method)) 3678 continue; 3679 3680 Diag(SO->second.front().Method->getLocation(), 3681 diag::note_pure_virtual_function) 3682 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3683 } 3684 } 3685 3686 if (!PureVirtualClassDiagSet) 3687 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3688 PureVirtualClassDiagSet->insert(RD); 3689} 3690 3691namespace { 3692struct AbstractUsageInfo { 3693 Sema &S; 3694 CXXRecordDecl *Record; 3695 CanQualType AbstractType; 3696 bool Invalid; 3697 3698 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3699 : S(S), Record(Record), 3700 AbstractType(S.Context.getCanonicalType( 3701 S.Context.getTypeDeclType(Record))), 3702 Invalid(false) {} 3703 3704 void DiagnoseAbstractType() { 3705 if (Invalid) return; 3706 S.DiagnoseAbstractType(Record); 3707 Invalid = true; 3708 } 3709 3710 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3711}; 3712 3713struct CheckAbstractUsage { 3714 AbstractUsageInfo &Info; 3715 const NamedDecl *Ctx; 3716 3717 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3718 : Info(Info), Ctx(Ctx) {} 3719 3720 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3721 switch (TL.getTypeLocClass()) { 3722#define ABSTRACT_TYPELOC(CLASS, PARENT) 3723#define TYPELOC(CLASS, PARENT) \ 3724 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3725#include "clang/AST/TypeLocNodes.def" 3726 } 3727 } 3728 3729 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3730 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3731 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3732 if (!TL.getArg(I)) 3733 continue; 3734 3735 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3736 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3737 } 3738 } 3739 3740 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3741 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3742 } 3743 3744 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3745 // Visit the type parameters from a permissive context. 3746 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3747 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3748 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3749 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3750 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3751 // TODO: other template argument types? 3752 } 3753 } 3754 3755 // Visit pointee types from a permissive context. 3756#define CheckPolymorphic(Type) \ 3757 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3758 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3759 } 3760 CheckPolymorphic(PointerTypeLoc) 3761 CheckPolymorphic(ReferenceTypeLoc) 3762 CheckPolymorphic(MemberPointerTypeLoc) 3763 CheckPolymorphic(BlockPointerTypeLoc) 3764 CheckPolymorphic(AtomicTypeLoc) 3765 3766 /// Handle all the types we haven't given a more specific 3767 /// implementation for above. 3768 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3769 // Every other kind of type that we haven't called out already 3770 // that has an inner type is either (1) sugar or (2) contains that 3771 // inner type in some way as a subobject. 3772 if (TypeLoc Next = TL.getNextTypeLoc()) 3773 return Visit(Next, Sel); 3774 3775 // If there's no inner type and we're in a permissive context, 3776 // don't diagnose. 3777 if (Sel == Sema::AbstractNone) return; 3778 3779 // Check whether the type matches the abstract type. 3780 QualType T = TL.getType(); 3781 if (T->isArrayType()) { 3782 Sel = Sema::AbstractArrayType; 3783 T = Info.S.Context.getBaseElementType(T); 3784 } 3785 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3786 if (CT != Info.AbstractType) return; 3787 3788 // It matched; do some magic. 3789 if (Sel == Sema::AbstractArrayType) { 3790 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3791 << T << TL.getSourceRange(); 3792 } else { 3793 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3794 << Sel << T << TL.getSourceRange(); 3795 } 3796 Info.DiagnoseAbstractType(); 3797 } 3798}; 3799 3800void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3801 Sema::AbstractDiagSelID Sel) { 3802 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3803} 3804 3805} 3806 3807/// Check for invalid uses of an abstract type in a method declaration. 3808static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3809 CXXMethodDecl *MD) { 3810 // No need to do the check on definitions, which require that 3811 // the return/param types be complete. 3812 if (MD->doesThisDeclarationHaveABody()) 3813 return; 3814 3815 // For safety's sake, just ignore it if we don't have type source 3816 // information. This should never happen for non-implicit methods, 3817 // but... 3818 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3819 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3820} 3821 3822/// Check for invalid uses of an abstract type within a class definition. 3823static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3824 CXXRecordDecl *RD) { 3825 for (CXXRecordDecl::decl_iterator 3826 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3827 Decl *D = *I; 3828 if (D->isImplicit()) continue; 3829 3830 // Methods and method templates. 3831 if (isa<CXXMethodDecl>(D)) { 3832 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3833 } else if (isa<FunctionTemplateDecl>(D)) { 3834 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3835 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3836 3837 // Fields and static variables. 3838 } else if (isa<FieldDecl>(D)) { 3839 FieldDecl *FD = cast<FieldDecl>(D); 3840 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3841 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3842 } else if (isa<VarDecl>(D)) { 3843 VarDecl *VD = cast<VarDecl>(D); 3844 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3845 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3846 3847 // Nested classes and class templates. 3848 } else if (isa<CXXRecordDecl>(D)) { 3849 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3850 } else if (isa<ClassTemplateDecl>(D)) { 3851 CheckAbstractClassUsage(Info, 3852 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3853 } 3854 } 3855} 3856 3857/// \brief Perform semantic checks on a class definition that has been 3858/// completing, introducing implicitly-declared members, checking for 3859/// abstract types, etc. 3860void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3861 if (!Record) 3862 return; 3863 3864 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3865 AbstractUsageInfo Info(*this, Record); 3866 CheckAbstractClassUsage(Info, Record); 3867 } 3868 3869 // If this is not an aggregate type and has no user-declared constructor, 3870 // complain about any non-static data members of reference or const scalar 3871 // type, since they will never get initializers. 3872 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3873 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3874 !Record->isLambda()) { 3875 bool Complained = false; 3876 for (RecordDecl::field_iterator F = Record->field_begin(), 3877 FEnd = Record->field_end(); 3878 F != FEnd; ++F) { 3879 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3880 continue; 3881 3882 if (F->getType()->isReferenceType() || 3883 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3884 if (!Complained) { 3885 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3886 << Record->getTagKind() << Record; 3887 Complained = true; 3888 } 3889 3890 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3891 << F->getType()->isReferenceType() 3892 << F->getDeclName(); 3893 } 3894 } 3895 } 3896 3897 if (Record->isDynamicClass() && !Record->isDependentType()) 3898 DynamicClasses.push_back(Record); 3899 3900 if (Record->getIdentifier()) { 3901 // C++ [class.mem]p13: 3902 // If T is the name of a class, then each of the following shall have a 3903 // name different from T: 3904 // - every member of every anonymous union that is a member of class T. 3905 // 3906 // C++ [class.mem]p14: 3907 // In addition, if class T has a user-declared constructor (12.1), every 3908 // non-static data member of class T shall have a name different from T. 3909 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3910 R.first != R.second; ++R.first) { 3911 NamedDecl *D = *R.first; 3912 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3913 isa<IndirectFieldDecl>(D)) { 3914 Diag(D->getLocation(), diag::err_member_name_of_class) 3915 << D->getDeclName(); 3916 break; 3917 } 3918 } 3919 } 3920 3921 // Warn if the class has virtual methods but non-virtual public destructor. 3922 if (Record->isPolymorphic() && !Record->isDependentType()) { 3923 CXXDestructorDecl *dtor = Record->getDestructor(); 3924 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3925 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3926 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3927 } 3928 3929 if (Record->isAbstract() && Record->hasAttr<FinalAttr>()) { 3930 Diag(Record->getLocation(), diag::warn_abstract_final_class); 3931 DiagnoseAbstractType(Record); 3932 } 3933 3934 // See if a method overloads virtual methods in a base 3935 /// class without overriding any. 3936 if (!Record->isDependentType()) { 3937 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3938 MEnd = Record->method_end(); 3939 M != MEnd; ++M) { 3940 if (!M->isStatic()) 3941 DiagnoseHiddenVirtualMethods(Record, *M); 3942 } 3943 } 3944 3945 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3946 // function that is not a constructor declares that member function to be 3947 // const. [...] The class of which that function is a member shall be 3948 // a literal type. 3949 // 3950 // If the class has virtual bases, any constexpr members will already have 3951 // been diagnosed by the checks performed on the member declaration, so 3952 // suppress this (less useful) diagnostic. 3953 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3954 !Record->isLiteral() && !Record->getNumVBases()) { 3955 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3956 MEnd = Record->method_end(); 3957 M != MEnd; ++M) { 3958 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3959 switch (Record->getTemplateSpecializationKind()) { 3960 case TSK_ImplicitInstantiation: 3961 case TSK_ExplicitInstantiationDeclaration: 3962 case TSK_ExplicitInstantiationDefinition: 3963 // If a template instantiates to a non-literal type, but its members 3964 // instantiate to constexpr functions, the template is technically 3965 // ill-formed, but we allow it for sanity. 3966 continue; 3967 3968 case TSK_Undeclared: 3969 case TSK_ExplicitSpecialization: 3970 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 3971 diag::err_constexpr_method_non_literal); 3972 break; 3973 } 3974 3975 // Only produce one error per class. 3976 break; 3977 } 3978 } 3979 } 3980 3981 // Declare inherited constructors. We do this eagerly here because: 3982 // - The standard requires an eager diagnostic for conflicting inherited 3983 // constructors from different classes. 3984 // - The lazy declaration of the other implicit constructors is so as to not 3985 // waste space and performance on classes that are not meant to be 3986 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3987 // have inherited constructors. 3988 DeclareInheritedConstructors(Record); 3989} 3990 3991void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3992 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3993 ME = Record->method_end(); 3994 MI != ME; ++MI) 3995 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) 3996 CheckExplicitlyDefaultedSpecialMember(*MI); 3997} 3998 3999/// Is the special member function which would be selected to perform the 4000/// specified operation on the specified class type a constexpr constructor? 4001static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4002 Sema::CXXSpecialMember CSM, 4003 bool ConstArg) { 4004 Sema::SpecialMemberOverloadResult *SMOR = 4005 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 4006 false, false, false, false); 4007 if (!SMOR || !SMOR->getMethod()) 4008 // A constructor we wouldn't select can't be "involved in initializing" 4009 // anything. 4010 return true; 4011 return SMOR->getMethod()->isConstexpr(); 4012} 4013 4014/// Determine whether the specified special member function would be constexpr 4015/// if it were implicitly defined. 4016static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4017 Sema::CXXSpecialMember CSM, 4018 bool ConstArg) { 4019 if (!S.getLangOpts().CPlusPlus0x) 4020 return false; 4021 4022 // C++11 [dcl.constexpr]p4: 4023 // In the definition of a constexpr constructor [...] 4024 switch (CSM) { 4025 case Sema::CXXDefaultConstructor: 4026 // Since default constructor lookup is essentially trivial (and cannot 4027 // involve, for instance, template instantiation), we compute whether a 4028 // defaulted default constructor is constexpr directly within CXXRecordDecl. 4029 // 4030 // This is important for performance; we need to know whether the default 4031 // constructor is constexpr to determine whether the type is a literal type. 4032 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 4033 4034 case Sema::CXXCopyConstructor: 4035 case Sema::CXXMoveConstructor: 4036 // For copy or move constructors, we need to perform overload resolution. 4037 break; 4038 4039 case Sema::CXXCopyAssignment: 4040 case Sema::CXXMoveAssignment: 4041 case Sema::CXXDestructor: 4042 case Sema::CXXInvalid: 4043 return false; 4044 } 4045 4046 // -- if the class is a non-empty union, or for each non-empty anonymous 4047 // union member of a non-union class, exactly one non-static data member 4048 // shall be initialized; [DR1359] 4049 // 4050 // If we squint, this is guaranteed, since exactly one non-static data member 4051 // will be initialized (if the constructor isn't deleted), we just don't know 4052 // which one. 4053 if (ClassDecl->isUnion()) 4054 return true; 4055 4056 // -- the class shall not have any virtual base classes; 4057 if (ClassDecl->getNumVBases()) 4058 return false; 4059 4060 // -- every constructor involved in initializing [...] base class 4061 // sub-objects shall be a constexpr constructor; 4062 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4063 BEnd = ClassDecl->bases_end(); 4064 B != BEnd; ++B) { 4065 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 4066 if (!BaseType) continue; 4067 4068 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4069 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 4070 return false; 4071 } 4072 4073 // -- every constructor involved in initializing non-static data members 4074 // [...] shall be a constexpr constructor; 4075 // -- every non-static data member and base class sub-object shall be 4076 // initialized 4077 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4078 FEnd = ClassDecl->field_end(); 4079 F != FEnd; ++F) { 4080 if (F->isInvalidDecl()) 4081 continue; 4082 if (const RecordType *RecordTy = 4083 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4084 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4085 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 4086 return false; 4087 } 4088 } 4089 4090 // All OK, it's constexpr! 4091 return true; 4092} 4093 4094static Sema::ImplicitExceptionSpecification 4095computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 4096 switch (S.getSpecialMember(MD)) { 4097 case Sema::CXXDefaultConstructor: 4098 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 4099 case Sema::CXXCopyConstructor: 4100 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 4101 case Sema::CXXCopyAssignment: 4102 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 4103 case Sema::CXXMoveConstructor: 4104 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 4105 case Sema::CXXMoveAssignment: 4106 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 4107 case Sema::CXXDestructor: 4108 return S.ComputeDefaultedDtorExceptionSpec(MD); 4109 case Sema::CXXInvalid: 4110 break; 4111 } 4112 llvm_unreachable("only special members have implicit exception specs"); 4113} 4114 4115static void 4116updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4117 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4118 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4119 ExceptSpec.getEPI(EPI); 4120 const FunctionProtoType *NewFPT = cast<FunctionProtoType>( 4121 S.Context.getFunctionType(FPT->getResultType(), FPT->arg_type_begin(), 4122 FPT->getNumArgs(), EPI)); 4123 FD->setType(QualType(NewFPT, 0)); 4124} 4125 4126void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4127 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4128 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4129 return; 4130 4131 // Evaluate the exception specification. 4132 ImplicitExceptionSpecification ExceptSpec = 4133 computeImplicitExceptionSpec(*this, Loc, MD); 4134 4135 // Update the type of the special member to use it. 4136 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4137 4138 // A user-provided destructor can be defined outside the class. When that 4139 // happens, be sure to update the exception specification on both 4140 // declarations. 4141 const FunctionProtoType *CanonicalFPT = 4142 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4143 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4144 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4145 CanonicalFPT, ExceptSpec); 4146} 4147 4148static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl); 4149static bool isImplicitCopyAssignmentArgConst(Sema &S, CXXRecordDecl *ClassDecl); 4150 4151void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4152 CXXRecordDecl *RD = MD->getParent(); 4153 CXXSpecialMember CSM = getSpecialMember(MD); 4154 4155 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4156 "not an explicitly-defaulted special member"); 4157 4158 // Whether this was the first-declared instance of the constructor. 4159 // This affects whether we implicitly add an exception spec and constexpr. 4160 bool First = MD == MD->getCanonicalDecl(); 4161 4162 bool HadError = false; 4163 4164 // C++11 [dcl.fct.def.default]p1: 4165 // A function that is explicitly defaulted shall 4166 // -- be a special member function (checked elsewhere), 4167 // -- have the same type (except for ref-qualifiers, and except that a 4168 // copy operation can take a non-const reference) as an implicit 4169 // declaration, and 4170 // -- not have default arguments. 4171 unsigned ExpectedParams = 1; 4172 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4173 ExpectedParams = 0; 4174 if (MD->getNumParams() != ExpectedParams) { 4175 // This also checks for default arguments: a copy or move constructor with a 4176 // default argument is classified as a default constructor, and assignment 4177 // operations and destructors can't have default arguments. 4178 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4179 << CSM << MD->getSourceRange(); 4180 HadError = true; 4181 } 4182 4183 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4184 4185 // Compute argument constness, constexpr, and triviality. 4186 bool CanHaveConstParam = false; 4187 bool Trivial = false; 4188 switch (CSM) { 4189 case CXXDefaultConstructor: 4190 Trivial = RD->hasTrivialDefaultConstructor(); 4191 break; 4192 case CXXCopyConstructor: 4193 CanHaveConstParam = isImplicitCopyCtorArgConst(*this, RD); 4194 Trivial = RD->hasTrivialCopyConstructor(); 4195 break; 4196 case CXXCopyAssignment: 4197 CanHaveConstParam = isImplicitCopyAssignmentArgConst(*this, RD); 4198 Trivial = RD->hasTrivialCopyAssignment(); 4199 break; 4200 case CXXMoveConstructor: 4201 Trivial = RD->hasTrivialMoveConstructor(); 4202 break; 4203 case CXXMoveAssignment: 4204 Trivial = RD->hasTrivialMoveAssignment(); 4205 break; 4206 case CXXDestructor: 4207 Trivial = RD->hasTrivialDestructor(); 4208 break; 4209 case CXXInvalid: 4210 llvm_unreachable("non-special member explicitly defaulted!"); 4211 } 4212 4213 QualType ReturnType = Context.VoidTy; 4214 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4215 // Check for return type matching. 4216 ReturnType = Type->getResultType(); 4217 QualType ExpectedReturnType = 4218 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4219 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4220 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4221 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4222 HadError = true; 4223 } 4224 4225 // A defaulted special member cannot have cv-qualifiers. 4226 if (Type->getTypeQuals()) { 4227 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4228 << (CSM == CXXMoveAssignment); 4229 HadError = true; 4230 } 4231 } 4232 4233 // Check for parameter type matching. 4234 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4235 bool HasConstParam = false; 4236 if (ExpectedParams && ArgType->isReferenceType()) { 4237 // Argument must be reference to possibly-const T. 4238 QualType ReferentType = ArgType->getPointeeType(); 4239 HasConstParam = ReferentType.isConstQualified(); 4240 4241 if (ReferentType.isVolatileQualified()) { 4242 Diag(MD->getLocation(), 4243 diag::err_defaulted_special_member_volatile_param) << CSM; 4244 HadError = true; 4245 } 4246 4247 if (HasConstParam && !CanHaveConstParam) { 4248 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4249 Diag(MD->getLocation(), 4250 diag::err_defaulted_special_member_copy_const_param) 4251 << (CSM == CXXCopyAssignment); 4252 // FIXME: Explain why this special member can't be const. 4253 } else { 4254 Diag(MD->getLocation(), 4255 diag::err_defaulted_special_member_move_const_param) 4256 << (CSM == CXXMoveAssignment); 4257 } 4258 HadError = true; 4259 } 4260 4261 // If a function is explicitly defaulted on its first declaration, it shall 4262 // have the same parameter type as if it had been implicitly declared. 4263 // (Presumably this is to prevent it from being trivial?) 4264 if (!HasConstParam && CanHaveConstParam && First) 4265 Diag(MD->getLocation(), 4266 diag::err_defaulted_special_member_copy_non_const_param) 4267 << (CSM == CXXCopyAssignment); 4268 } else if (ExpectedParams) { 4269 // A copy assignment operator can take its argument by value, but a 4270 // defaulted one cannot. 4271 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4272 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4273 HadError = true; 4274 } 4275 4276 // Rebuild the type with the implicit exception specification added, if we 4277 // are going to need it. 4278 const FunctionProtoType *ImplicitType = 0; 4279 if (First || Type->hasExceptionSpec()) { 4280 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4281 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4282 ImplicitType = cast<FunctionProtoType>( 4283 Context.getFunctionType(ReturnType, &ArgType, ExpectedParams, EPI)); 4284 } 4285 4286 // C++11 [dcl.fct.def.default]p2: 4287 // An explicitly-defaulted function may be declared constexpr only if it 4288 // would have been implicitly declared as constexpr, 4289 // Do not apply this rule to members of class templates, since core issue 1358 4290 // makes such functions always instantiate to constexpr functions. For 4291 // non-constructors, this is checked elsewhere. 4292 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4293 HasConstParam); 4294 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr && 4295 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4296 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4297 // FIXME: Explain why the constructor can't be constexpr. 4298 HadError = true; 4299 } 4300 // and may have an explicit exception-specification only if it is compatible 4301 // with the exception-specification on the implicit declaration. 4302 if (Type->hasExceptionSpec() && 4303 CheckEquivalentExceptionSpec( 4304 PDiag(diag::err_incorrect_defaulted_exception_spec) << CSM, 4305 PDiag(), ImplicitType, SourceLocation(), Type, MD->getLocation())) 4306 HadError = true; 4307 4308 // If a function is explicitly defaulted on its first declaration, 4309 if (First) { 4310 // -- it is implicitly considered to be constexpr if the implicit 4311 // definition would be, 4312 MD->setConstexpr(Constexpr); 4313 4314 // -- it is implicitly considered to have the same exception-specification 4315 // as if it had been implicitly declared, 4316 MD->setType(QualType(ImplicitType, 0)); 4317 4318 // Such a function is also trivial if the implicitly-declared function 4319 // would have been. 4320 MD->setTrivial(Trivial); 4321 } 4322 4323 if (ShouldDeleteSpecialMember(MD, CSM)) { 4324 if (First) { 4325 MD->setDeletedAsWritten(); 4326 } else { 4327 // C++11 [dcl.fct.def.default]p4: 4328 // [For a] user-provided explicitly-defaulted function [...] if such a 4329 // function is implicitly defined as deleted, the program is ill-formed. 4330 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4331 HadError = true; 4332 } 4333 } 4334 4335 if (HadError) 4336 MD->setInvalidDecl(); 4337} 4338 4339namespace { 4340struct SpecialMemberDeletionInfo { 4341 Sema &S; 4342 CXXMethodDecl *MD; 4343 Sema::CXXSpecialMember CSM; 4344 bool Diagnose; 4345 4346 // Properties of the special member, computed for convenience. 4347 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4348 SourceLocation Loc; 4349 4350 bool AllFieldsAreConst; 4351 4352 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4353 Sema::CXXSpecialMember CSM, bool Diagnose) 4354 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4355 IsConstructor(false), IsAssignment(false), IsMove(false), 4356 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4357 AllFieldsAreConst(true) { 4358 switch (CSM) { 4359 case Sema::CXXDefaultConstructor: 4360 case Sema::CXXCopyConstructor: 4361 IsConstructor = true; 4362 break; 4363 case Sema::CXXMoveConstructor: 4364 IsConstructor = true; 4365 IsMove = true; 4366 break; 4367 case Sema::CXXCopyAssignment: 4368 IsAssignment = true; 4369 break; 4370 case Sema::CXXMoveAssignment: 4371 IsAssignment = true; 4372 IsMove = true; 4373 break; 4374 case Sema::CXXDestructor: 4375 break; 4376 case Sema::CXXInvalid: 4377 llvm_unreachable("invalid special member kind"); 4378 } 4379 4380 if (MD->getNumParams()) { 4381 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4382 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4383 } 4384 } 4385 4386 bool inUnion() const { return MD->getParent()->isUnion(); } 4387 4388 /// Look up the corresponding special member in the given class. 4389 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4390 unsigned Quals) { 4391 unsigned TQ = MD->getTypeQualifiers(); 4392 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4393 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4394 Quals = 0; 4395 return S.LookupSpecialMember(Class, CSM, 4396 ConstArg || (Quals & Qualifiers::Const), 4397 VolatileArg || (Quals & Qualifiers::Volatile), 4398 MD->getRefQualifier() == RQ_RValue, 4399 TQ & Qualifiers::Const, 4400 TQ & Qualifiers::Volatile); 4401 } 4402 4403 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4404 4405 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4406 bool shouldDeleteForField(FieldDecl *FD); 4407 bool shouldDeleteForAllConstMembers(); 4408 4409 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4410 unsigned Quals); 4411 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4412 Sema::SpecialMemberOverloadResult *SMOR, 4413 bool IsDtorCallInCtor); 4414 4415 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4416}; 4417} 4418 4419/// Is the given special member inaccessible when used on the given 4420/// sub-object. 4421bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4422 CXXMethodDecl *target) { 4423 /// If we're operating on a base class, the object type is the 4424 /// type of this special member. 4425 QualType objectTy; 4426 AccessSpecifier access = target->getAccess(); 4427 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4428 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4429 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4430 4431 // If we're operating on a field, the object type is the type of the field. 4432 } else { 4433 objectTy = S.Context.getTypeDeclType(target->getParent()); 4434 } 4435 4436 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4437} 4438 4439/// Check whether we should delete a special member due to the implicit 4440/// definition containing a call to a special member of a subobject. 4441bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4442 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4443 bool IsDtorCallInCtor) { 4444 CXXMethodDecl *Decl = SMOR->getMethod(); 4445 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4446 4447 int DiagKind = -1; 4448 4449 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4450 DiagKind = !Decl ? 0 : 1; 4451 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4452 DiagKind = 2; 4453 else if (!isAccessible(Subobj, Decl)) 4454 DiagKind = 3; 4455 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4456 !Decl->isTrivial()) { 4457 // A member of a union must have a trivial corresponding special member. 4458 // As a weird special case, a destructor call from a union's constructor 4459 // must be accessible and non-deleted, but need not be trivial. Such a 4460 // destructor is never actually called, but is semantically checked as 4461 // if it were. 4462 DiagKind = 4; 4463 } 4464 4465 if (DiagKind == -1) 4466 return false; 4467 4468 if (Diagnose) { 4469 if (Field) { 4470 S.Diag(Field->getLocation(), 4471 diag::note_deleted_special_member_class_subobject) 4472 << CSM << MD->getParent() << /*IsField*/true 4473 << Field << DiagKind << IsDtorCallInCtor; 4474 } else { 4475 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4476 S.Diag(Base->getLocStart(), 4477 diag::note_deleted_special_member_class_subobject) 4478 << CSM << MD->getParent() << /*IsField*/false 4479 << Base->getType() << DiagKind << IsDtorCallInCtor; 4480 } 4481 4482 if (DiagKind == 1) 4483 S.NoteDeletedFunction(Decl); 4484 // FIXME: Explain inaccessibility if DiagKind == 3. 4485 } 4486 4487 return true; 4488} 4489 4490/// Check whether we should delete a special member function due to having a 4491/// direct or virtual base class or non-static data member of class type M. 4492bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4493 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 4494 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4495 4496 // C++11 [class.ctor]p5: 4497 // -- any direct or virtual base class, or non-static data member with no 4498 // brace-or-equal-initializer, has class type M (or array thereof) and 4499 // either M has no default constructor or overload resolution as applied 4500 // to M's default constructor results in an ambiguity or in a function 4501 // that is deleted or inaccessible 4502 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4503 // -- a direct or virtual base class B that cannot be copied/moved because 4504 // overload resolution, as applied to B's corresponding special member, 4505 // results in an ambiguity or a function that is deleted or inaccessible 4506 // from the defaulted special member 4507 // C++11 [class.dtor]p5: 4508 // -- any direct or virtual base class [...] has a type with a destructor 4509 // that is deleted or inaccessible 4510 if (!(CSM == Sema::CXXDefaultConstructor && 4511 Field && Field->hasInClassInitializer()) && 4512 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 4513 return true; 4514 4515 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4516 // -- any direct or virtual base class or non-static data member has a 4517 // type with a destructor that is deleted or inaccessible 4518 if (IsConstructor) { 4519 Sema::SpecialMemberOverloadResult *SMOR = 4520 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4521 false, false, false, false, false); 4522 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4523 return true; 4524 } 4525 4526 return false; 4527} 4528 4529/// Check whether we should delete a special member function due to the class 4530/// having a particular direct or virtual base class. 4531bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4532 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4533 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 4534} 4535 4536/// Check whether we should delete a special member function due to the class 4537/// having a particular non-static data member. 4538bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4539 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4540 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4541 4542 if (CSM == Sema::CXXDefaultConstructor) { 4543 // For a default constructor, all references must be initialized in-class 4544 // and, if a union, it must have a non-const member. 4545 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4546 if (Diagnose) 4547 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4548 << MD->getParent() << FD << FieldType << /*Reference*/0; 4549 return true; 4550 } 4551 // C++11 [class.ctor]p5: any non-variant non-static data member of 4552 // const-qualified type (or array thereof) with no 4553 // brace-or-equal-initializer does not have a user-provided default 4554 // constructor. 4555 if (!inUnion() && FieldType.isConstQualified() && 4556 !FD->hasInClassInitializer() && 4557 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4558 if (Diagnose) 4559 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4560 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4561 return true; 4562 } 4563 4564 if (inUnion() && !FieldType.isConstQualified()) 4565 AllFieldsAreConst = false; 4566 } else if (CSM == Sema::CXXCopyConstructor) { 4567 // For a copy constructor, data members must not be of rvalue reference 4568 // type. 4569 if (FieldType->isRValueReferenceType()) { 4570 if (Diagnose) 4571 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4572 << MD->getParent() << FD << FieldType; 4573 return true; 4574 } 4575 } else if (IsAssignment) { 4576 // For an assignment operator, data members must not be of reference type. 4577 if (FieldType->isReferenceType()) { 4578 if (Diagnose) 4579 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4580 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4581 return true; 4582 } 4583 if (!FieldRecord && FieldType.isConstQualified()) { 4584 // C++11 [class.copy]p23: 4585 // -- a non-static data member of const non-class type (or array thereof) 4586 if (Diagnose) 4587 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4588 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4589 return true; 4590 } 4591 } 4592 4593 if (FieldRecord) { 4594 // Some additional restrictions exist on the variant members. 4595 if (!inUnion() && FieldRecord->isUnion() && 4596 FieldRecord->isAnonymousStructOrUnion()) { 4597 bool AllVariantFieldsAreConst = true; 4598 4599 // FIXME: Handle anonymous unions declared within anonymous unions. 4600 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4601 UE = FieldRecord->field_end(); 4602 UI != UE; ++UI) { 4603 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4604 4605 if (!UnionFieldType.isConstQualified()) 4606 AllVariantFieldsAreConst = false; 4607 4608 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4609 if (UnionFieldRecord && 4610 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 4611 UnionFieldType.getCVRQualifiers())) 4612 return true; 4613 } 4614 4615 // At least one member in each anonymous union must be non-const 4616 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4617 FieldRecord->field_begin() != FieldRecord->field_end()) { 4618 if (Diagnose) 4619 S.Diag(FieldRecord->getLocation(), 4620 diag::note_deleted_default_ctor_all_const) 4621 << MD->getParent() << /*anonymous union*/1; 4622 return true; 4623 } 4624 4625 // Don't check the implicit member of the anonymous union type. 4626 // This is technically non-conformant, but sanity demands it. 4627 return false; 4628 } 4629 4630 if (shouldDeleteForClassSubobject(FieldRecord, FD, 4631 FieldType.getCVRQualifiers())) 4632 return true; 4633 } 4634 4635 return false; 4636} 4637 4638/// C++11 [class.ctor] p5: 4639/// A defaulted default constructor for a class X is defined as deleted if 4640/// X is a union and all of its variant members are of const-qualified type. 4641bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4642 // This is a silly definition, because it gives an empty union a deleted 4643 // default constructor. Don't do that. 4644 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4645 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4646 if (Diagnose) 4647 S.Diag(MD->getParent()->getLocation(), 4648 diag::note_deleted_default_ctor_all_const) 4649 << MD->getParent() << /*not anonymous union*/0; 4650 return true; 4651 } 4652 return false; 4653} 4654 4655/// Determine whether a defaulted special member function should be defined as 4656/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4657/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4658bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4659 bool Diagnose) { 4660 if (MD->isInvalidDecl()) 4661 return false; 4662 CXXRecordDecl *RD = MD->getParent(); 4663 assert(!RD->isDependentType() && "do deletion after instantiation"); 4664 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4665 return false; 4666 4667 // C++11 [expr.lambda.prim]p19: 4668 // The closure type associated with a lambda-expression has a 4669 // deleted (8.4.3) default constructor and a deleted copy 4670 // assignment operator. 4671 if (RD->isLambda() && 4672 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4673 if (Diagnose) 4674 Diag(RD->getLocation(), diag::note_lambda_decl); 4675 return true; 4676 } 4677 4678 // For an anonymous struct or union, the copy and assignment special members 4679 // will never be used, so skip the check. For an anonymous union declared at 4680 // namespace scope, the constructor and destructor are used. 4681 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4682 RD->isAnonymousStructOrUnion()) 4683 return false; 4684 4685 // C++11 [class.copy]p7, p18: 4686 // If the class definition declares a move constructor or move assignment 4687 // operator, an implicitly declared copy constructor or copy assignment 4688 // operator is defined as deleted. 4689 if (MD->isImplicit() && 4690 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4691 CXXMethodDecl *UserDeclaredMove = 0; 4692 4693 // In Microsoft mode, a user-declared move only causes the deletion of the 4694 // corresponding copy operation, not both copy operations. 4695 if (RD->hasUserDeclaredMoveConstructor() && 4696 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4697 if (!Diagnose) return true; 4698 UserDeclaredMove = RD->getMoveConstructor(); 4699 assert(UserDeclaredMove); 4700 } else if (RD->hasUserDeclaredMoveAssignment() && 4701 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4702 if (!Diagnose) return true; 4703 UserDeclaredMove = RD->getMoveAssignmentOperator(); 4704 assert(UserDeclaredMove); 4705 } 4706 4707 if (UserDeclaredMove) { 4708 Diag(UserDeclaredMove->getLocation(), 4709 diag::note_deleted_copy_user_declared_move) 4710 << (CSM == CXXCopyAssignment) << RD 4711 << UserDeclaredMove->isMoveAssignmentOperator(); 4712 return true; 4713 } 4714 } 4715 4716 // Do access control from the special member function 4717 ContextRAII MethodContext(*this, MD); 4718 4719 // C++11 [class.dtor]p5: 4720 // -- for a virtual destructor, lookup of the non-array deallocation function 4721 // results in an ambiguity or in a function that is deleted or inaccessible 4722 if (CSM == CXXDestructor && MD->isVirtual()) { 4723 FunctionDecl *OperatorDelete = 0; 4724 DeclarationName Name = 4725 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4726 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4727 OperatorDelete, false)) { 4728 if (Diagnose) 4729 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4730 return true; 4731 } 4732 } 4733 4734 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4735 4736 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4737 BE = RD->bases_end(); BI != BE; ++BI) 4738 if (!BI->isVirtual() && 4739 SMI.shouldDeleteForBase(BI)) 4740 return true; 4741 4742 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4743 BE = RD->vbases_end(); BI != BE; ++BI) 4744 if (SMI.shouldDeleteForBase(BI)) 4745 return true; 4746 4747 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4748 FE = RD->field_end(); FI != FE; ++FI) 4749 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4750 SMI.shouldDeleteForField(*FI)) 4751 return true; 4752 4753 if (SMI.shouldDeleteForAllConstMembers()) 4754 return true; 4755 4756 return false; 4757} 4758 4759/// \brief Data used with FindHiddenVirtualMethod 4760namespace { 4761 struct FindHiddenVirtualMethodData { 4762 Sema *S; 4763 CXXMethodDecl *Method; 4764 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4765 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4766 }; 4767} 4768 4769/// \brief Check whether any most overriden method from MD in Methods 4770static bool CheckMostOverridenMethods(const CXXMethodDecl *MD, 4771 const llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 4772 if (MD->size_overridden_methods() == 0) 4773 return Methods.count(MD->getCanonicalDecl()); 4774 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4775 E = MD->end_overridden_methods(); 4776 I != E; ++I) 4777 if (CheckMostOverridenMethods(*I, Methods)) 4778 return true; 4779 return false; 4780} 4781 4782/// \brief Member lookup function that determines whether a given C++ 4783/// method overloads virtual methods in a base class without overriding any, 4784/// to be used with CXXRecordDecl::lookupInBases(). 4785static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4786 CXXBasePath &Path, 4787 void *UserData) { 4788 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4789 4790 FindHiddenVirtualMethodData &Data 4791 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4792 4793 DeclarationName Name = Data.Method->getDeclName(); 4794 assert(Name.getNameKind() == DeclarationName::Identifier); 4795 4796 bool foundSameNameMethod = false; 4797 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4798 for (Path.Decls = BaseRecord->lookup(Name); 4799 Path.Decls.first != Path.Decls.second; 4800 ++Path.Decls.first) { 4801 NamedDecl *D = *Path.Decls.first; 4802 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4803 MD = MD->getCanonicalDecl(); 4804 foundSameNameMethod = true; 4805 // Interested only in hidden virtual methods. 4806 if (!MD->isVirtual()) 4807 continue; 4808 // If the method we are checking overrides a method from its base 4809 // don't warn about the other overloaded methods. 4810 if (!Data.S->IsOverload(Data.Method, MD, false)) 4811 return true; 4812 // Collect the overload only if its hidden. 4813 if (!CheckMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods)) 4814 overloadedMethods.push_back(MD); 4815 } 4816 } 4817 4818 if (foundSameNameMethod) 4819 Data.OverloadedMethods.append(overloadedMethods.begin(), 4820 overloadedMethods.end()); 4821 return foundSameNameMethod; 4822} 4823 4824/// \brief Add the most overriden methods from MD to Methods 4825static void AddMostOverridenMethods(const CXXMethodDecl *MD, 4826 llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 4827 if (MD->size_overridden_methods() == 0) 4828 Methods.insert(MD->getCanonicalDecl()); 4829 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4830 E = MD->end_overridden_methods(); 4831 I != E; ++I) 4832 AddMostOverridenMethods(*I, Methods); 4833} 4834 4835/// \brief See if a method overloads virtual methods in a base class without 4836/// overriding any. 4837void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4838 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4839 MD->getLocation()) == DiagnosticsEngine::Ignored) 4840 return; 4841 if (!MD->getDeclName().isIdentifier()) 4842 return; 4843 4844 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4845 /*bool RecordPaths=*/false, 4846 /*bool DetectVirtual=*/false); 4847 FindHiddenVirtualMethodData Data; 4848 Data.Method = MD; 4849 Data.S = this; 4850 4851 // Keep the base methods that were overriden or introduced in the subclass 4852 // by 'using' in a set. A base method not in this set is hidden. 4853 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4854 res.first != res.second; ++res.first) { 4855 NamedDecl *ND = *res.first; 4856 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4857 ND = shad->getTargetDecl(); 4858 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND)) 4859 AddMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods); 4860 } 4861 4862 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4863 !Data.OverloadedMethods.empty()) { 4864 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4865 << MD << (Data.OverloadedMethods.size() > 1); 4866 4867 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4868 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4869 Diag(overloadedMD->getLocation(), 4870 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4871 } 4872 } 4873} 4874 4875void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4876 Decl *TagDecl, 4877 SourceLocation LBrac, 4878 SourceLocation RBrac, 4879 AttributeList *AttrList) { 4880 if (!TagDecl) 4881 return; 4882 4883 AdjustDeclIfTemplate(TagDecl); 4884 4885 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 4886 if (l->getKind() != AttributeList::AT_Visibility) 4887 continue; 4888 l->setInvalid(); 4889 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 4890 l->getName(); 4891 } 4892 4893 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4894 // strict aliasing violation! 4895 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4896 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4897 4898 CheckCompletedCXXClass( 4899 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4900} 4901 4902/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4903/// special functions, such as the default constructor, copy 4904/// constructor, or destructor, to the given C++ class (C++ 4905/// [special]p1). This routine can only be executed just before the 4906/// definition of the class is complete. 4907void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4908 if (!ClassDecl->hasUserDeclaredConstructor()) 4909 ++ASTContext::NumImplicitDefaultConstructors; 4910 4911 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4912 ++ASTContext::NumImplicitCopyConstructors; 4913 4914 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4915 ++ASTContext::NumImplicitMoveConstructors; 4916 4917 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4918 ++ASTContext::NumImplicitCopyAssignmentOperators; 4919 4920 // If we have a dynamic class, then the copy assignment operator may be 4921 // virtual, so we have to declare it immediately. This ensures that, e.g., 4922 // it shows up in the right place in the vtable and that we diagnose 4923 // problems with the implicit exception specification. 4924 if (ClassDecl->isDynamicClass()) 4925 DeclareImplicitCopyAssignment(ClassDecl); 4926 } 4927 4928 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()) { 4929 ++ASTContext::NumImplicitMoveAssignmentOperators; 4930 4931 // Likewise for the move assignment operator. 4932 if (ClassDecl->isDynamicClass()) 4933 DeclareImplicitMoveAssignment(ClassDecl); 4934 } 4935 4936 if (!ClassDecl->hasUserDeclaredDestructor()) { 4937 ++ASTContext::NumImplicitDestructors; 4938 4939 // If we have a dynamic class, then the destructor may be virtual, so we 4940 // have to declare the destructor immediately. This ensures that, e.g., it 4941 // shows up in the right place in the vtable and that we diagnose problems 4942 // with the implicit exception specification. 4943 if (ClassDecl->isDynamicClass()) 4944 DeclareImplicitDestructor(ClassDecl); 4945 } 4946} 4947 4948void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4949 if (!D) 4950 return; 4951 4952 int NumParamList = D->getNumTemplateParameterLists(); 4953 for (int i = 0; i < NumParamList; i++) { 4954 TemplateParameterList* Params = D->getTemplateParameterList(i); 4955 for (TemplateParameterList::iterator Param = Params->begin(), 4956 ParamEnd = Params->end(); 4957 Param != ParamEnd; ++Param) { 4958 NamedDecl *Named = cast<NamedDecl>(*Param); 4959 if (Named->getDeclName()) { 4960 S->AddDecl(Named); 4961 IdResolver.AddDecl(Named); 4962 } 4963 } 4964 } 4965} 4966 4967void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4968 if (!D) 4969 return; 4970 4971 TemplateParameterList *Params = 0; 4972 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4973 Params = Template->getTemplateParameters(); 4974 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4975 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4976 Params = PartialSpec->getTemplateParameters(); 4977 else 4978 return; 4979 4980 for (TemplateParameterList::iterator Param = Params->begin(), 4981 ParamEnd = Params->end(); 4982 Param != ParamEnd; ++Param) { 4983 NamedDecl *Named = cast<NamedDecl>(*Param); 4984 if (Named->getDeclName()) { 4985 S->AddDecl(Named); 4986 IdResolver.AddDecl(Named); 4987 } 4988 } 4989} 4990 4991void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4992 if (!RecordD) return; 4993 AdjustDeclIfTemplate(RecordD); 4994 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4995 PushDeclContext(S, Record); 4996} 4997 4998void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4999 if (!RecordD) return; 5000 PopDeclContext(); 5001} 5002 5003/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5004/// parsing a top-level (non-nested) C++ class, and we are now 5005/// parsing those parts of the given Method declaration that could 5006/// not be parsed earlier (C++ [class.mem]p2), such as default 5007/// arguments. This action should enter the scope of the given 5008/// Method declaration as if we had just parsed the qualified method 5009/// name. However, it should not bring the parameters into scope; 5010/// that will be performed by ActOnDelayedCXXMethodParameter. 5011void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5012} 5013 5014/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5015/// C++ method declaration. We're (re-)introducing the given 5016/// function parameter into scope for use in parsing later parts of 5017/// the method declaration. For example, we could see an 5018/// ActOnParamDefaultArgument event for this parameter. 5019void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5020 if (!ParamD) 5021 return; 5022 5023 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5024 5025 // If this parameter has an unparsed default argument, clear it out 5026 // to make way for the parsed default argument. 5027 if (Param->hasUnparsedDefaultArg()) 5028 Param->setDefaultArg(0); 5029 5030 S->AddDecl(Param); 5031 if (Param->getDeclName()) 5032 IdResolver.AddDecl(Param); 5033} 5034 5035/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5036/// processing the delayed method declaration for Method. The method 5037/// declaration is now considered finished. There may be a separate 5038/// ActOnStartOfFunctionDef action later (not necessarily 5039/// immediately!) for this method, if it was also defined inside the 5040/// class body. 5041void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5042 if (!MethodD) 5043 return; 5044 5045 AdjustDeclIfTemplate(MethodD); 5046 5047 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5048 5049 // Now that we have our default arguments, check the constructor 5050 // again. It could produce additional diagnostics or affect whether 5051 // the class has implicitly-declared destructors, among other 5052 // things. 5053 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5054 CheckConstructor(Constructor); 5055 5056 // Check the default arguments, which we may have added. 5057 if (!Method->isInvalidDecl()) 5058 CheckCXXDefaultArguments(Method); 5059} 5060 5061/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5062/// the well-formedness of the constructor declarator @p D with type @p 5063/// R. If there are any errors in the declarator, this routine will 5064/// emit diagnostics and set the invalid bit to true. In any case, the type 5065/// will be updated to reflect a well-formed type for the constructor and 5066/// returned. 5067QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5068 StorageClass &SC) { 5069 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5070 5071 // C++ [class.ctor]p3: 5072 // A constructor shall not be virtual (10.3) or static (9.4). A 5073 // constructor can be invoked for a const, volatile or const 5074 // volatile object. A constructor shall not be declared const, 5075 // volatile, or const volatile (9.3.2). 5076 if (isVirtual) { 5077 if (!D.isInvalidType()) 5078 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5079 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5080 << SourceRange(D.getIdentifierLoc()); 5081 D.setInvalidType(); 5082 } 5083 if (SC == SC_Static) { 5084 if (!D.isInvalidType()) 5085 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5086 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5087 << SourceRange(D.getIdentifierLoc()); 5088 D.setInvalidType(); 5089 SC = SC_None; 5090 } 5091 5092 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5093 if (FTI.TypeQuals != 0) { 5094 if (FTI.TypeQuals & Qualifiers::Const) 5095 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5096 << "const" << SourceRange(D.getIdentifierLoc()); 5097 if (FTI.TypeQuals & Qualifiers::Volatile) 5098 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5099 << "volatile" << SourceRange(D.getIdentifierLoc()); 5100 if (FTI.TypeQuals & Qualifiers::Restrict) 5101 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5102 << "restrict" << SourceRange(D.getIdentifierLoc()); 5103 D.setInvalidType(); 5104 } 5105 5106 // C++0x [class.ctor]p4: 5107 // A constructor shall not be declared with a ref-qualifier. 5108 if (FTI.hasRefQualifier()) { 5109 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5110 << FTI.RefQualifierIsLValueRef 5111 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5112 D.setInvalidType(); 5113 } 5114 5115 // Rebuild the function type "R" without any type qualifiers (in 5116 // case any of the errors above fired) and with "void" as the 5117 // return type, since constructors don't have return types. 5118 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5119 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5120 return R; 5121 5122 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5123 EPI.TypeQuals = 0; 5124 EPI.RefQualifier = RQ_None; 5125 5126 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5127 Proto->getNumArgs(), EPI); 5128} 5129 5130/// CheckConstructor - Checks a fully-formed constructor for 5131/// well-formedness, issuing any diagnostics required. Returns true if 5132/// the constructor declarator is invalid. 5133void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5134 CXXRecordDecl *ClassDecl 5135 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5136 if (!ClassDecl) 5137 return Constructor->setInvalidDecl(); 5138 5139 // C++ [class.copy]p3: 5140 // A declaration of a constructor for a class X is ill-formed if 5141 // its first parameter is of type (optionally cv-qualified) X and 5142 // either there are no other parameters or else all other 5143 // parameters have default arguments. 5144 if (!Constructor->isInvalidDecl() && 5145 ((Constructor->getNumParams() == 1) || 5146 (Constructor->getNumParams() > 1 && 5147 Constructor->getParamDecl(1)->hasDefaultArg())) && 5148 Constructor->getTemplateSpecializationKind() 5149 != TSK_ImplicitInstantiation) { 5150 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5151 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5152 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5153 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5154 const char *ConstRef 5155 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5156 : " const &"; 5157 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5158 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5159 5160 // FIXME: Rather that making the constructor invalid, we should endeavor 5161 // to fix the type. 5162 Constructor->setInvalidDecl(); 5163 } 5164 } 5165} 5166 5167/// CheckDestructor - Checks a fully-formed destructor definition for 5168/// well-formedness, issuing any diagnostics required. Returns true 5169/// on error. 5170bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5171 CXXRecordDecl *RD = Destructor->getParent(); 5172 5173 if (Destructor->isVirtual()) { 5174 SourceLocation Loc; 5175 5176 if (!Destructor->isImplicit()) 5177 Loc = Destructor->getLocation(); 5178 else 5179 Loc = RD->getLocation(); 5180 5181 // If we have a virtual destructor, look up the deallocation function 5182 FunctionDecl *OperatorDelete = 0; 5183 DeclarationName Name = 5184 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5185 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5186 return true; 5187 5188 MarkFunctionReferenced(Loc, OperatorDelete); 5189 5190 Destructor->setOperatorDelete(OperatorDelete); 5191 } 5192 5193 return false; 5194} 5195 5196static inline bool 5197FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5198 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5199 FTI.ArgInfo[0].Param && 5200 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5201} 5202 5203/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5204/// the well-formednes of the destructor declarator @p D with type @p 5205/// R. If there are any errors in the declarator, this routine will 5206/// emit diagnostics and set the declarator to invalid. Even if this happens, 5207/// will be updated to reflect a well-formed type for the destructor and 5208/// returned. 5209QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5210 StorageClass& SC) { 5211 // C++ [class.dtor]p1: 5212 // [...] A typedef-name that names a class is a class-name 5213 // (7.1.3); however, a typedef-name that names a class shall not 5214 // be used as the identifier in the declarator for a destructor 5215 // declaration. 5216 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5217 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5218 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5219 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5220 else if (const TemplateSpecializationType *TST = 5221 DeclaratorType->getAs<TemplateSpecializationType>()) 5222 if (TST->isTypeAlias()) 5223 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5224 << DeclaratorType << 1; 5225 5226 // C++ [class.dtor]p2: 5227 // A destructor is used to destroy objects of its class type. A 5228 // destructor takes no parameters, and no return type can be 5229 // specified for it (not even void). The address of a destructor 5230 // shall not be taken. A destructor shall not be static. A 5231 // destructor can be invoked for a const, volatile or const 5232 // volatile object. A destructor shall not be declared const, 5233 // volatile or const volatile (9.3.2). 5234 if (SC == SC_Static) { 5235 if (!D.isInvalidType()) 5236 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5237 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5238 << SourceRange(D.getIdentifierLoc()) 5239 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5240 5241 SC = SC_None; 5242 } 5243 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5244 // Destructors don't have return types, but the parser will 5245 // happily parse something like: 5246 // 5247 // class X { 5248 // float ~X(); 5249 // }; 5250 // 5251 // The return type will be eliminated later. 5252 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5253 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5254 << SourceRange(D.getIdentifierLoc()); 5255 } 5256 5257 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5258 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5259 if (FTI.TypeQuals & Qualifiers::Const) 5260 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5261 << "const" << SourceRange(D.getIdentifierLoc()); 5262 if (FTI.TypeQuals & Qualifiers::Volatile) 5263 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5264 << "volatile" << SourceRange(D.getIdentifierLoc()); 5265 if (FTI.TypeQuals & Qualifiers::Restrict) 5266 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5267 << "restrict" << SourceRange(D.getIdentifierLoc()); 5268 D.setInvalidType(); 5269 } 5270 5271 // C++0x [class.dtor]p2: 5272 // A destructor shall not be declared with a ref-qualifier. 5273 if (FTI.hasRefQualifier()) { 5274 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5275 << FTI.RefQualifierIsLValueRef 5276 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5277 D.setInvalidType(); 5278 } 5279 5280 // Make sure we don't have any parameters. 5281 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5282 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5283 5284 // Delete the parameters. 5285 FTI.freeArgs(); 5286 D.setInvalidType(); 5287 } 5288 5289 // Make sure the destructor isn't variadic. 5290 if (FTI.isVariadic) { 5291 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5292 D.setInvalidType(); 5293 } 5294 5295 // Rebuild the function type "R" without any type qualifiers or 5296 // parameters (in case any of the errors above fired) and with 5297 // "void" as the return type, since destructors don't have return 5298 // types. 5299 if (!D.isInvalidType()) 5300 return R; 5301 5302 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5303 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5304 EPI.Variadic = false; 5305 EPI.TypeQuals = 0; 5306 EPI.RefQualifier = RQ_None; 5307 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5308} 5309 5310/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5311/// well-formednes of the conversion function declarator @p D with 5312/// type @p R. If there are any errors in the declarator, this routine 5313/// will emit diagnostics and return true. Otherwise, it will return 5314/// false. Either way, the type @p R will be updated to reflect a 5315/// well-formed type for the conversion operator. 5316void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5317 StorageClass& SC) { 5318 // C++ [class.conv.fct]p1: 5319 // Neither parameter types nor return type can be specified. The 5320 // type of a conversion function (8.3.5) is "function taking no 5321 // parameter returning conversion-type-id." 5322 if (SC == SC_Static) { 5323 if (!D.isInvalidType()) 5324 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5325 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5326 << SourceRange(D.getIdentifierLoc()); 5327 D.setInvalidType(); 5328 SC = SC_None; 5329 } 5330 5331 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5332 5333 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5334 // Conversion functions don't have return types, but the parser will 5335 // happily parse something like: 5336 // 5337 // class X { 5338 // float operator bool(); 5339 // }; 5340 // 5341 // The return type will be changed later anyway. 5342 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5343 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5344 << SourceRange(D.getIdentifierLoc()); 5345 D.setInvalidType(); 5346 } 5347 5348 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5349 5350 // Make sure we don't have any parameters. 5351 if (Proto->getNumArgs() > 0) { 5352 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5353 5354 // Delete the parameters. 5355 D.getFunctionTypeInfo().freeArgs(); 5356 D.setInvalidType(); 5357 } else if (Proto->isVariadic()) { 5358 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5359 D.setInvalidType(); 5360 } 5361 5362 // Diagnose "&operator bool()" and other such nonsense. This 5363 // is actually a gcc extension which we don't support. 5364 if (Proto->getResultType() != ConvType) { 5365 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5366 << Proto->getResultType(); 5367 D.setInvalidType(); 5368 ConvType = Proto->getResultType(); 5369 } 5370 5371 // C++ [class.conv.fct]p4: 5372 // The conversion-type-id shall not represent a function type nor 5373 // an array type. 5374 if (ConvType->isArrayType()) { 5375 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5376 ConvType = Context.getPointerType(ConvType); 5377 D.setInvalidType(); 5378 } else if (ConvType->isFunctionType()) { 5379 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5380 ConvType = Context.getPointerType(ConvType); 5381 D.setInvalidType(); 5382 } 5383 5384 // Rebuild the function type "R" without any parameters (in case any 5385 // of the errors above fired) and with the conversion type as the 5386 // return type. 5387 if (D.isInvalidType()) 5388 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5389 5390 // C++0x explicit conversion operators. 5391 if (D.getDeclSpec().isExplicitSpecified()) 5392 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5393 getLangOpts().CPlusPlus0x ? 5394 diag::warn_cxx98_compat_explicit_conversion_functions : 5395 diag::ext_explicit_conversion_functions) 5396 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5397} 5398 5399/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5400/// the declaration of the given C++ conversion function. This routine 5401/// is responsible for recording the conversion function in the C++ 5402/// class, if possible. 5403Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5404 assert(Conversion && "Expected to receive a conversion function declaration"); 5405 5406 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5407 5408 // Make sure we aren't redeclaring the conversion function. 5409 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5410 5411 // C++ [class.conv.fct]p1: 5412 // [...] A conversion function is never used to convert a 5413 // (possibly cv-qualified) object to the (possibly cv-qualified) 5414 // same object type (or a reference to it), to a (possibly 5415 // cv-qualified) base class of that type (or a reference to it), 5416 // or to (possibly cv-qualified) void. 5417 // FIXME: Suppress this warning if the conversion function ends up being a 5418 // virtual function that overrides a virtual function in a base class. 5419 QualType ClassType 5420 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5421 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5422 ConvType = ConvTypeRef->getPointeeType(); 5423 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5424 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5425 /* Suppress diagnostics for instantiations. */; 5426 else if (ConvType->isRecordType()) { 5427 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5428 if (ConvType == ClassType) 5429 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5430 << ClassType; 5431 else if (IsDerivedFrom(ClassType, ConvType)) 5432 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5433 << ClassType << ConvType; 5434 } else if (ConvType->isVoidType()) { 5435 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5436 << ClassType << ConvType; 5437 } 5438 5439 if (FunctionTemplateDecl *ConversionTemplate 5440 = Conversion->getDescribedFunctionTemplate()) 5441 return ConversionTemplate; 5442 5443 return Conversion; 5444} 5445 5446//===----------------------------------------------------------------------===// 5447// Namespace Handling 5448//===----------------------------------------------------------------------===// 5449 5450/// \brief Diagnose a mismatch in 'inline' qualifiers when a namespace is 5451/// reopened. 5452static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc, 5453 SourceLocation Loc, 5454 IdentifierInfo *II, bool *IsInline, 5455 NamespaceDecl *PrevNS) { 5456 assert(*IsInline != PrevNS->isInline()); 5457 5458 // HACK: Work around a bug in libstdc++4.6's <atomic>, where 5459 // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as 5460 // inline namespaces, with the intention of bringing names into namespace std. 5461 // 5462 // We support this just well enough to get that case working; this is not 5463 // sufficient to support reopening namespaces as inline in general. 5464 if (*IsInline && II && II->getName().startswith("__atomic") && 5465 S.getSourceManager().isInSystemHeader(Loc)) { 5466 // Mark all prior declarations of the namespace as inline. 5467 for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS; 5468 NS = NS->getPreviousDecl()) 5469 NS->setInline(*IsInline); 5470 // Patch up the lookup table for the containing namespace. This isn't really 5471 // correct, but it's good enough for this particular case. 5472 for (DeclContext::decl_iterator I = PrevNS->decls_begin(), 5473 E = PrevNS->decls_end(); I != E; ++I) 5474 if (NamedDecl *ND = dyn_cast<NamedDecl>(*I)) 5475 PrevNS->getParent()->makeDeclVisibleInContext(ND); 5476 return; 5477 } 5478 5479 if (PrevNS->isInline()) 5480 // The user probably just forgot the 'inline', so suggest that it 5481 // be added back. 5482 S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5483 << FixItHint::CreateInsertion(KeywordLoc, "inline "); 5484 else 5485 S.Diag(Loc, diag::err_inline_namespace_mismatch) 5486 << IsInline; 5487 5488 S.Diag(PrevNS->getLocation(), diag::note_previous_definition); 5489 *IsInline = PrevNS->isInline(); 5490} 5491 5492/// ActOnStartNamespaceDef - This is called at the start of a namespace 5493/// definition. 5494Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5495 SourceLocation InlineLoc, 5496 SourceLocation NamespaceLoc, 5497 SourceLocation IdentLoc, 5498 IdentifierInfo *II, 5499 SourceLocation LBrace, 5500 AttributeList *AttrList) { 5501 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5502 // For anonymous namespace, take the location of the left brace. 5503 SourceLocation Loc = II ? IdentLoc : LBrace; 5504 bool IsInline = InlineLoc.isValid(); 5505 bool IsInvalid = false; 5506 bool IsStd = false; 5507 bool AddToKnown = false; 5508 Scope *DeclRegionScope = NamespcScope->getParent(); 5509 5510 NamespaceDecl *PrevNS = 0; 5511 if (II) { 5512 // C++ [namespace.def]p2: 5513 // The identifier in an original-namespace-definition shall not 5514 // have been previously defined in the declarative region in 5515 // which the original-namespace-definition appears. The 5516 // identifier in an original-namespace-definition is the name of 5517 // the namespace. Subsequently in that declarative region, it is 5518 // treated as an original-namespace-name. 5519 // 5520 // Since namespace names are unique in their scope, and we don't 5521 // look through using directives, just look for any ordinary names. 5522 5523 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5524 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5525 Decl::IDNS_Namespace; 5526 NamedDecl *PrevDecl = 0; 5527 for (DeclContext::lookup_result R 5528 = CurContext->getRedeclContext()->lookup(II); 5529 R.first != R.second; ++R.first) { 5530 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5531 PrevDecl = *R.first; 5532 break; 5533 } 5534 } 5535 5536 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5537 5538 if (PrevNS) { 5539 // This is an extended namespace definition. 5540 if (IsInline != PrevNS->isInline()) 5541 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II, 5542 &IsInline, PrevNS); 5543 } else if (PrevDecl) { 5544 // This is an invalid name redefinition. 5545 Diag(Loc, diag::err_redefinition_different_kind) 5546 << II; 5547 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5548 IsInvalid = true; 5549 // Continue on to push Namespc as current DeclContext and return it. 5550 } else if (II->isStr("std") && 5551 CurContext->getRedeclContext()->isTranslationUnit()) { 5552 // This is the first "real" definition of the namespace "std", so update 5553 // our cache of the "std" namespace to point at this definition. 5554 PrevNS = getStdNamespace(); 5555 IsStd = true; 5556 AddToKnown = !IsInline; 5557 } else { 5558 // We've seen this namespace for the first time. 5559 AddToKnown = !IsInline; 5560 } 5561 } else { 5562 // Anonymous namespaces. 5563 5564 // Determine whether the parent already has an anonymous namespace. 5565 DeclContext *Parent = CurContext->getRedeclContext(); 5566 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5567 PrevNS = TU->getAnonymousNamespace(); 5568 } else { 5569 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5570 PrevNS = ND->getAnonymousNamespace(); 5571 } 5572 5573 if (PrevNS && IsInline != PrevNS->isInline()) 5574 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II, 5575 &IsInline, PrevNS); 5576 } 5577 5578 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5579 StartLoc, Loc, II, PrevNS); 5580 if (IsInvalid) 5581 Namespc->setInvalidDecl(); 5582 5583 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5584 5585 // FIXME: Should we be merging attributes? 5586 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5587 PushNamespaceVisibilityAttr(Attr, Loc); 5588 5589 if (IsStd) 5590 StdNamespace = Namespc; 5591 if (AddToKnown) 5592 KnownNamespaces[Namespc] = false; 5593 5594 if (II) { 5595 PushOnScopeChains(Namespc, DeclRegionScope); 5596 } else { 5597 // Link the anonymous namespace into its parent. 5598 DeclContext *Parent = CurContext->getRedeclContext(); 5599 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5600 TU->setAnonymousNamespace(Namespc); 5601 } else { 5602 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5603 } 5604 5605 CurContext->addDecl(Namespc); 5606 5607 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5608 // behaves as if it were replaced by 5609 // namespace unique { /* empty body */ } 5610 // using namespace unique; 5611 // namespace unique { namespace-body } 5612 // where all occurrences of 'unique' in a translation unit are 5613 // replaced by the same identifier and this identifier differs 5614 // from all other identifiers in the entire program. 5615 5616 // We just create the namespace with an empty name and then add an 5617 // implicit using declaration, just like the standard suggests. 5618 // 5619 // CodeGen enforces the "universally unique" aspect by giving all 5620 // declarations semantically contained within an anonymous 5621 // namespace internal linkage. 5622 5623 if (!PrevNS) { 5624 UsingDirectiveDecl* UD 5625 = UsingDirectiveDecl::Create(Context, Parent, 5626 /* 'using' */ LBrace, 5627 /* 'namespace' */ SourceLocation(), 5628 /* qualifier */ NestedNameSpecifierLoc(), 5629 /* identifier */ SourceLocation(), 5630 Namespc, 5631 /* Ancestor */ Parent); 5632 UD->setImplicit(); 5633 Parent->addDecl(UD); 5634 } 5635 } 5636 5637 ActOnDocumentableDecl(Namespc); 5638 5639 // Although we could have an invalid decl (i.e. the namespace name is a 5640 // redefinition), push it as current DeclContext and try to continue parsing. 5641 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5642 // for the namespace has the declarations that showed up in that particular 5643 // namespace definition. 5644 PushDeclContext(NamespcScope, Namespc); 5645 return Namespc; 5646} 5647 5648/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5649/// is a namespace alias, returns the namespace it points to. 5650static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5651 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5652 return AD->getNamespace(); 5653 return dyn_cast_or_null<NamespaceDecl>(D); 5654} 5655 5656/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5657/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5658void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5659 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5660 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5661 Namespc->setRBraceLoc(RBrace); 5662 PopDeclContext(); 5663 if (Namespc->hasAttr<VisibilityAttr>()) 5664 PopPragmaVisibility(true, RBrace); 5665} 5666 5667CXXRecordDecl *Sema::getStdBadAlloc() const { 5668 return cast_or_null<CXXRecordDecl>( 5669 StdBadAlloc.get(Context.getExternalSource())); 5670} 5671 5672NamespaceDecl *Sema::getStdNamespace() const { 5673 return cast_or_null<NamespaceDecl>( 5674 StdNamespace.get(Context.getExternalSource())); 5675} 5676 5677/// \brief Retrieve the special "std" namespace, which may require us to 5678/// implicitly define the namespace. 5679NamespaceDecl *Sema::getOrCreateStdNamespace() { 5680 if (!StdNamespace) { 5681 // The "std" namespace has not yet been defined, so build one implicitly. 5682 StdNamespace = NamespaceDecl::Create(Context, 5683 Context.getTranslationUnitDecl(), 5684 /*Inline=*/false, 5685 SourceLocation(), SourceLocation(), 5686 &PP.getIdentifierTable().get("std"), 5687 /*PrevDecl=*/0); 5688 getStdNamespace()->setImplicit(true); 5689 } 5690 5691 return getStdNamespace(); 5692} 5693 5694bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5695 assert(getLangOpts().CPlusPlus && 5696 "Looking for std::initializer_list outside of C++."); 5697 5698 // We're looking for implicit instantiations of 5699 // template <typename E> class std::initializer_list. 5700 5701 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5702 return false; 5703 5704 ClassTemplateDecl *Template = 0; 5705 const TemplateArgument *Arguments = 0; 5706 5707 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5708 5709 ClassTemplateSpecializationDecl *Specialization = 5710 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5711 if (!Specialization) 5712 return false; 5713 5714 Template = Specialization->getSpecializedTemplate(); 5715 Arguments = Specialization->getTemplateArgs().data(); 5716 } else if (const TemplateSpecializationType *TST = 5717 Ty->getAs<TemplateSpecializationType>()) { 5718 Template = dyn_cast_or_null<ClassTemplateDecl>( 5719 TST->getTemplateName().getAsTemplateDecl()); 5720 Arguments = TST->getArgs(); 5721 } 5722 if (!Template) 5723 return false; 5724 5725 if (!StdInitializerList) { 5726 // Haven't recognized std::initializer_list yet, maybe this is it. 5727 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5728 if (TemplateClass->getIdentifier() != 5729 &PP.getIdentifierTable().get("initializer_list") || 5730 !getStdNamespace()->InEnclosingNamespaceSetOf( 5731 TemplateClass->getDeclContext())) 5732 return false; 5733 // This is a template called std::initializer_list, but is it the right 5734 // template? 5735 TemplateParameterList *Params = Template->getTemplateParameters(); 5736 if (Params->getMinRequiredArguments() != 1) 5737 return false; 5738 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5739 return false; 5740 5741 // It's the right template. 5742 StdInitializerList = Template; 5743 } 5744 5745 if (Template != StdInitializerList) 5746 return false; 5747 5748 // This is an instance of std::initializer_list. Find the argument type. 5749 if (Element) 5750 *Element = Arguments[0].getAsType(); 5751 return true; 5752} 5753 5754static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5755 NamespaceDecl *Std = S.getStdNamespace(); 5756 if (!Std) { 5757 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5758 return 0; 5759 } 5760 5761 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5762 Loc, Sema::LookupOrdinaryName); 5763 if (!S.LookupQualifiedName(Result, Std)) { 5764 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5765 return 0; 5766 } 5767 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5768 if (!Template) { 5769 Result.suppressDiagnostics(); 5770 // We found something weird. Complain about the first thing we found. 5771 NamedDecl *Found = *Result.begin(); 5772 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5773 return 0; 5774 } 5775 5776 // We found some template called std::initializer_list. Now verify that it's 5777 // correct. 5778 TemplateParameterList *Params = Template->getTemplateParameters(); 5779 if (Params->getMinRequiredArguments() != 1 || 5780 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5781 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5782 return 0; 5783 } 5784 5785 return Template; 5786} 5787 5788QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5789 if (!StdInitializerList) { 5790 StdInitializerList = LookupStdInitializerList(*this, Loc); 5791 if (!StdInitializerList) 5792 return QualType(); 5793 } 5794 5795 TemplateArgumentListInfo Args(Loc, Loc); 5796 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5797 Context.getTrivialTypeSourceInfo(Element, 5798 Loc))); 5799 return Context.getCanonicalType( 5800 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5801} 5802 5803bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5804 // C++ [dcl.init.list]p2: 5805 // A constructor is an initializer-list constructor if its first parameter 5806 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5807 // std::initializer_list<E> for some type E, and either there are no other 5808 // parameters or else all other parameters have default arguments. 5809 if (Ctor->getNumParams() < 1 || 5810 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5811 return false; 5812 5813 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5814 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5815 ArgType = RT->getPointeeType().getUnqualifiedType(); 5816 5817 return isStdInitializerList(ArgType, 0); 5818} 5819 5820/// \brief Determine whether a using statement is in a context where it will be 5821/// apply in all contexts. 5822static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5823 switch (CurContext->getDeclKind()) { 5824 case Decl::TranslationUnit: 5825 return true; 5826 case Decl::LinkageSpec: 5827 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5828 default: 5829 return false; 5830 } 5831} 5832 5833namespace { 5834 5835// Callback to only accept typo corrections that are namespaces. 5836class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5837 public: 5838 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5839 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5840 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5841 } 5842 return false; 5843 } 5844}; 5845 5846} 5847 5848static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5849 CXXScopeSpec &SS, 5850 SourceLocation IdentLoc, 5851 IdentifierInfo *Ident) { 5852 NamespaceValidatorCCC Validator; 5853 R.clear(); 5854 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5855 R.getLookupKind(), Sc, &SS, 5856 Validator)) { 5857 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 5858 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 5859 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5860 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5861 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5862 << FixItHint::CreateReplacement(Corrected.getCorrectionRange(), 5863 CorrectedStr); 5864 else 5865 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5866 << Ident << CorrectedQuotedStr 5867 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5868 5869 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5870 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5871 5872 R.addDecl(Corrected.getCorrectionDecl()); 5873 return true; 5874 } 5875 return false; 5876} 5877 5878Decl *Sema::ActOnUsingDirective(Scope *S, 5879 SourceLocation UsingLoc, 5880 SourceLocation NamespcLoc, 5881 CXXScopeSpec &SS, 5882 SourceLocation IdentLoc, 5883 IdentifierInfo *NamespcName, 5884 AttributeList *AttrList) { 5885 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5886 assert(NamespcName && "Invalid NamespcName."); 5887 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5888 5889 // This can only happen along a recovery path. 5890 while (S->getFlags() & Scope::TemplateParamScope) 5891 S = S->getParent(); 5892 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5893 5894 UsingDirectiveDecl *UDir = 0; 5895 NestedNameSpecifier *Qualifier = 0; 5896 if (SS.isSet()) 5897 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5898 5899 // Lookup namespace name. 5900 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5901 LookupParsedName(R, S, &SS); 5902 if (R.isAmbiguous()) 5903 return 0; 5904 5905 if (R.empty()) { 5906 R.clear(); 5907 // Allow "using namespace std;" or "using namespace ::std;" even if 5908 // "std" hasn't been defined yet, for GCC compatibility. 5909 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5910 NamespcName->isStr("std")) { 5911 Diag(IdentLoc, diag::ext_using_undefined_std); 5912 R.addDecl(getOrCreateStdNamespace()); 5913 R.resolveKind(); 5914 } 5915 // Otherwise, attempt typo correction. 5916 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5917 } 5918 5919 if (!R.empty()) { 5920 NamedDecl *Named = R.getFoundDecl(); 5921 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5922 && "expected namespace decl"); 5923 // C++ [namespace.udir]p1: 5924 // A using-directive specifies that the names in the nominated 5925 // namespace can be used in the scope in which the 5926 // using-directive appears after the using-directive. During 5927 // unqualified name lookup (3.4.1), the names appear as if they 5928 // were declared in the nearest enclosing namespace which 5929 // contains both the using-directive and the nominated 5930 // namespace. [Note: in this context, "contains" means "contains 5931 // directly or indirectly". ] 5932 5933 // Find enclosing context containing both using-directive and 5934 // nominated namespace. 5935 NamespaceDecl *NS = getNamespaceDecl(Named); 5936 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5937 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5938 CommonAncestor = CommonAncestor->getParent(); 5939 5940 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5941 SS.getWithLocInContext(Context), 5942 IdentLoc, Named, CommonAncestor); 5943 5944 if (IsUsingDirectiveInToplevelContext(CurContext) && 5945 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5946 Diag(IdentLoc, diag::warn_using_directive_in_header); 5947 } 5948 5949 PushUsingDirective(S, UDir); 5950 } else { 5951 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5952 } 5953 5954 // FIXME: We ignore attributes for now. 5955 return UDir; 5956} 5957 5958void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5959 // If the scope has an associated entity and the using directive is at 5960 // namespace or translation unit scope, add the UsingDirectiveDecl into 5961 // its lookup structure so qualified name lookup can find it. 5962 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 5963 if (Ctx && !Ctx->isFunctionOrMethod()) 5964 Ctx->addDecl(UDir); 5965 else 5966 // Otherwise, it is at block sope. The using-directives will affect lookup 5967 // only to the end of the scope. 5968 S->PushUsingDirective(UDir); 5969} 5970 5971 5972Decl *Sema::ActOnUsingDeclaration(Scope *S, 5973 AccessSpecifier AS, 5974 bool HasUsingKeyword, 5975 SourceLocation UsingLoc, 5976 CXXScopeSpec &SS, 5977 UnqualifiedId &Name, 5978 AttributeList *AttrList, 5979 bool IsTypeName, 5980 SourceLocation TypenameLoc) { 5981 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5982 5983 switch (Name.getKind()) { 5984 case UnqualifiedId::IK_ImplicitSelfParam: 5985 case UnqualifiedId::IK_Identifier: 5986 case UnqualifiedId::IK_OperatorFunctionId: 5987 case UnqualifiedId::IK_LiteralOperatorId: 5988 case UnqualifiedId::IK_ConversionFunctionId: 5989 break; 5990 5991 case UnqualifiedId::IK_ConstructorName: 5992 case UnqualifiedId::IK_ConstructorTemplateId: 5993 // C++11 inheriting constructors. 5994 Diag(Name.getLocStart(), 5995 getLangOpts().CPlusPlus0x ? 5996 // FIXME: Produce warn_cxx98_compat_using_decl_constructor 5997 // instead once inheriting constructors work. 5998 diag::err_using_decl_constructor_unsupported : 5999 diag::err_using_decl_constructor) 6000 << SS.getRange(); 6001 6002 if (getLangOpts().CPlusPlus0x) break; 6003 6004 return 0; 6005 6006 case UnqualifiedId::IK_DestructorName: 6007 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 6008 << SS.getRange(); 6009 return 0; 6010 6011 case UnqualifiedId::IK_TemplateId: 6012 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 6013 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 6014 return 0; 6015 } 6016 6017 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 6018 DeclarationName TargetName = TargetNameInfo.getName(); 6019 if (!TargetName) 6020 return 0; 6021 6022 // Warn about using declarations. 6023 // TODO: store that the declaration was written without 'using' and 6024 // talk about access decls instead of using decls in the 6025 // diagnostics. 6026 if (!HasUsingKeyword) { 6027 UsingLoc = Name.getLocStart(); 6028 6029 Diag(UsingLoc, diag::warn_access_decl_deprecated) 6030 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 6031 } 6032 6033 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 6034 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 6035 return 0; 6036 6037 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 6038 TargetNameInfo, AttrList, 6039 /* IsInstantiation */ false, 6040 IsTypeName, TypenameLoc); 6041 if (UD) 6042 PushOnScopeChains(UD, S, /*AddToContext*/ false); 6043 6044 return UD; 6045} 6046 6047/// \brief Determine whether a using declaration considers the given 6048/// declarations as "equivalent", e.g., if they are redeclarations of 6049/// the same entity or are both typedefs of the same type. 6050static bool 6051IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 6052 bool &SuppressRedeclaration) { 6053 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 6054 SuppressRedeclaration = false; 6055 return true; 6056 } 6057 6058 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 6059 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6060 SuppressRedeclaration = true; 6061 return Context.hasSameType(TD1->getUnderlyingType(), 6062 TD2->getUnderlyingType()); 6063 } 6064 6065 return false; 6066} 6067 6068 6069/// Determines whether to create a using shadow decl for a particular 6070/// decl, given the set of decls existing prior to this using lookup. 6071bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6072 const LookupResult &Previous) { 6073 // Diagnose finding a decl which is not from a base class of the 6074 // current class. We do this now because there are cases where this 6075 // function will silently decide not to build a shadow decl, which 6076 // will pre-empt further diagnostics. 6077 // 6078 // We don't need to do this in C++0x because we do the check once on 6079 // the qualifier. 6080 // 6081 // FIXME: diagnose the following if we care enough: 6082 // struct A { int foo; }; 6083 // struct B : A { using A::foo; }; 6084 // template <class T> struct C : A {}; 6085 // template <class T> struct D : C<T> { using B::foo; } // <--- 6086 // This is invalid (during instantiation) in C++03 because B::foo 6087 // resolves to the using decl in B, which is not a base class of D<T>. 6088 // We can't diagnose it immediately because C<T> is an unknown 6089 // specialization. The UsingShadowDecl in D<T> then points directly 6090 // to A::foo, which will look well-formed when we instantiate. 6091 // The right solution is to not collapse the shadow-decl chain. 6092 if (!getLangOpts().CPlusPlus0x && CurContext->isRecord()) { 6093 DeclContext *OrigDC = Orig->getDeclContext(); 6094 6095 // Handle enums and anonymous structs. 6096 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6097 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6098 while (OrigRec->isAnonymousStructOrUnion()) 6099 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6100 6101 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6102 if (OrigDC == CurContext) { 6103 Diag(Using->getLocation(), 6104 diag::err_using_decl_nested_name_specifier_is_current_class) 6105 << Using->getQualifierLoc().getSourceRange(); 6106 Diag(Orig->getLocation(), diag::note_using_decl_target); 6107 return true; 6108 } 6109 6110 Diag(Using->getQualifierLoc().getBeginLoc(), 6111 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6112 << Using->getQualifier() 6113 << cast<CXXRecordDecl>(CurContext) 6114 << Using->getQualifierLoc().getSourceRange(); 6115 Diag(Orig->getLocation(), diag::note_using_decl_target); 6116 return true; 6117 } 6118 } 6119 6120 if (Previous.empty()) return false; 6121 6122 NamedDecl *Target = Orig; 6123 if (isa<UsingShadowDecl>(Target)) 6124 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6125 6126 // If the target happens to be one of the previous declarations, we 6127 // don't have a conflict. 6128 // 6129 // FIXME: but we might be increasing its access, in which case we 6130 // should redeclare it. 6131 NamedDecl *NonTag = 0, *Tag = 0; 6132 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6133 I != E; ++I) { 6134 NamedDecl *D = (*I)->getUnderlyingDecl(); 6135 bool Result; 6136 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6137 return Result; 6138 6139 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6140 } 6141 6142 if (Target->isFunctionOrFunctionTemplate()) { 6143 FunctionDecl *FD; 6144 if (isa<FunctionTemplateDecl>(Target)) 6145 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6146 else 6147 FD = cast<FunctionDecl>(Target); 6148 6149 NamedDecl *OldDecl = 0; 6150 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6151 case Ovl_Overload: 6152 return false; 6153 6154 case Ovl_NonFunction: 6155 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6156 break; 6157 6158 // We found a decl with the exact signature. 6159 case Ovl_Match: 6160 // If we're in a record, we want to hide the target, so we 6161 // return true (without a diagnostic) to tell the caller not to 6162 // build a shadow decl. 6163 if (CurContext->isRecord()) 6164 return true; 6165 6166 // If we're not in a record, this is an error. 6167 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6168 break; 6169 } 6170 6171 Diag(Target->getLocation(), diag::note_using_decl_target); 6172 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6173 return true; 6174 } 6175 6176 // Target is not a function. 6177 6178 if (isa<TagDecl>(Target)) { 6179 // No conflict between a tag and a non-tag. 6180 if (!Tag) return false; 6181 6182 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6183 Diag(Target->getLocation(), diag::note_using_decl_target); 6184 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6185 return true; 6186 } 6187 6188 // No conflict between a tag and a non-tag. 6189 if (!NonTag) return false; 6190 6191 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6192 Diag(Target->getLocation(), diag::note_using_decl_target); 6193 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6194 return true; 6195} 6196 6197/// Builds a shadow declaration corresponding to a 'using' declaration. 6198UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6199 UsingDecl *UD, 6200 NamedDecl *Orig) { 6201 6202 // If we resolved to another shadow declaration, just coalesce them. 6203 NamedDecl *Target = Orig; 6204 if (isa<UsingShadowDecl>(Target)) { 6205 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6206 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6207 } 6208 6209 UsingShadowDecl *Shadow 6210 = UsingShadowDecl::Create(Context, CurContext, 6211 UD->getLocation(), UD, Target); 6212 UD->addShadowDecl(Shadow); 6213 6214 Shadow->setAccess(UD->getAccess()); 6215 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6216 Shadow->setInvalidDecl(); 6217 6218 if (S) 6219 PushOnScopeChains(Shadow, S); 6220 else 6221 CurContext->addDecl(Shadow); 6222 6223 6224 return Shadow; 6225} 6226 6227/// Hides a using shadow declaration. This is required by the current 6228/// using-decl implementation when a resolvable using declaration in a 6229/// class is followed by a declaration which would hide or override 6230/// one or more of the using decl's targets; for example: 6231/// 6232/// struct Base { void foo(int); }; 6233/// struct Derived : Base { 6234/// using Base::foo; 6235/// void foo(int); 6236/// }; 6237/// 6238/// The governing language is C++03 [namespace.udecl]p12: 6239/// 6240/// When a using-declaration brings names from a base class into a 6241/// derived class scope, member functions in the derived class 6242/// override and/or hide member functions with the same name and 6243/// parameter types in a base class (rather than conflicting). 6244/// 6245/// There are two ways to implement this: 6246/// (1) optimistically create shadow decls when they're not hidden 6247/// by existing declarations, or 6248/// (2) don't create any shadow decls (or at least don't make them 6249/// visible) until we've fully parsed/instantiated the class. 6250/// The problem with (1) is that we might have to retroactively remove 6251/// a shadow decl, which requires several O(n) operations because the 6252/// decl structures are (very reasonably) not designed for removal. 6253/// (2) avoids this but is very fiddly and phase-dependent. 6254void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6255 if (Shadow->getDeclName().getNameKind() == 6256 DeclarationName::CXXConversionFunctionName) 6257 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6258 6259 // Remove it from the DeclContext... 6260 Shadow->getDeclContext()->removeDecl(Shadow); 6261 6262 // ...and the scope, if applicable... 6263 if (S) { 6264 S->RemoveDecl(Shadow); 6265 IdResolver.RemoveDecl(Shadow); 6266 } 6267 6268 // ...and the using decl. 6269 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6270 6271 // TODO: complain somehow if Shadow was used. It shouldn't 6272 // be possible for this to happen, because...? 6273} 6274 6275/// Builds a using declaration. 6276/// 6277/// \param IsInstantiation - Whether this call arises from an 6278/// instantiation of an unresolved using declaration. We treat 6279/// the lookup differently for these declarations. 6280NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6281 SourceLocation UsingLoc, 6282 CXXScopeSpec &SS, 6283 const DeclarationNameInfo &NameInfo, 6284 AttributeList *AttrList, 6285 bool IsInstantiation, 6286 bool IsTypeName, 6287 SourceLocation TypenameLoc) { 6288 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6289 SourceLocation IdentLoc = NameInfo.getLoc(); 6290 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6291 6292 // FIXME: We ignore attributes for now. 6293 6294 if (SS.isEmpty()) { 6295 Diag(IdentLoc, diag::err_using_requires_qualname); 6296 return 0; 6297 } 6298 6299 // Do the redeclaration lookup in the current scope. 6300 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6301 ForRedeclaration); 6302 Previous.setHideTags(false); 6303 if (S) { 6304 LookupName(Previous, S); 6305 6306 // It is really dumb that we have to do this. 6307 LookupResult::Filter F = Previous.makeFilter(); 6308 while (F.hasNext()) { 6309 NamedDecl *D = F.next(); 6310 if (!isDeclInScope(D, CurContext, S)) 6311 F.erase(); 6312 } 6313 F.done(); 6314 } else { 6315 assert(IsInstantiation && "no scope in non-instantiation"); 6316 assert(CurContext->isRecord() && "scope not record in instantiation"); 6317 LookupQualifiedName(Previous, CurContext); 6318 } 6319 6320 // Check for invalid redeclarations. 6321 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6322 return 0; 6323 6324 // Check for bad qualifiers. 6325 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6326 return 0; 6327 6328 DeclContext *LookupContext = computeDeclContext(SS); 6329 NamedDecl *D; 6330 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6331 if (!LookupContext) { 6332 if (IsTypeName) { 6333 // FIXME: not all declaration name kinds are legal here 6334 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6335 UsingLoc, TypenameLoc, 6336 QualifierLoc, 6337 IdentLoc, NameInfo.getName()); 6338 } else { 6339 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6340 QualifierLoc, NameInfo); 6341 } 6342 } else { 6343 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6344 NameInfo, IsTypeName); 6345 } 6346 D->setAccess(AS); 6347 CurContext->addDecl(D); 6348 6349 if (!LookupContext) return D; 6350 UsingDecl *UD = cast<UsingDecl>(D); 6351 6352 if (RequireCompleteDeclContext(SS, LookupContext)) { 6353 UD->setInvalidDecl(); 6354 return UD; 6355 } 6356 6357 // The normal rules do not apply to inheriting constructor declarations. 6358 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6359 if (CheckInheritingConstructorUsingDecl(UD)) 6360 UD->setInvalidDecl(); 6361 return UD; 6362 } 6363 6364 // Otherwise, look up the target name. 6365 6366 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6367 6368 // Unlike most lookups, we don't always want to hide tag 6369 // declarations: tag names are visible through the using declaration 6370 // even if hidden by ordinary names, *except* in a dependent context 6371 // where it's important for the sanity of two-phase lookup. 6372 if (!IsInstantiation) 6373 R.setHideTags(false); 6374 6375 // For the purposes of this lookup, we have a base object type 6376 // equal to that of the current context. 6377 if (CurContext->isRecord()) { 6378 R.setBaseObjectType( 6379 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6380 } 6381 6382 LookupQualifiedName(R, LookupContext); 6383 6384 if (R.empty()) { 6385 Diag(IdentLoc, diag::err_no_member) 6386 << NameInfo.getName() << LookupContext << SS.getRange(); 6387 UD->setInvalidDecl(); 6388 return UD; 6389 } 6390 6391 if (R.isAmbiguous()) { 6392 UD->setInvalidDecl(); 6393 return UD; 6394 } 6395 6396 if (IsTypeName) { 6397 // If we asked for a typename and got a non-type decl, error out. 6398 if (!R.getAsSingle<TypeDecl>()) { 6399 Diag(IdentLoc, diag::err_using_typename_non_type); 6400 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6401 Diag((*I)->getUnderlyingDecl()->getLocation(), 6402 diag::note_using_decl_target); 6403 UD->setInvalidDecl(); 6404 return UD; 6405 } 6406 } else { 6407 // If we asked for a non-typename and we got a type, error out, 6408 // but only if this is an instantiation of an unresolved using 6409 // decl. Otherwise just silently find the type name. 6410 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6411 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6412 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6413 UD->setInvalidDecl(); 6414 return UD; 6415 } 6416 } 6417 6418 // C++0x N2914 [namespace.udecl]p6: 6419 // A using-declaration shall not name a namespace. 6420 if (R.getAsSingle<NamespaceDecl>()) { 6421 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6422 << SS.getRange(); 6423 UD->setInvalidDecl(); 6424 return UD; 6425 } 6426 6427 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6428 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6429 BuildUsingShadowDecl(S, UD, *I); 6430 } 6431 6432 return UD; 6433} 6434 6435/// Additional checks for a using declaration referring to a constructor name. 6436bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6437 assert(!UD->isTypeName() && "expecting a constructor name"); 6438 6439 const Type *SourceType = UD->getQualifier()->getAsType(); 6440 assert(SourceType && 6441 "Using decl naming constructor doesn't have type in scope spec."); 6442 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6443 6444 // Check whether the named type is a direct base class. 6445 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6446 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6447 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6448 BaseIt != BaseE; ++BaseIt) { 6449 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6450 if (CanonicalSourceType == BaseType) 6451 break; 6452 if (BaseIt->getType()->isDependentType()) 6453 break; 6454 } 6455 6456 if (BaseIt == BaseE) { 6457 // Did not find SourceType in the bases. 6458 Diag(UD->getUsingLocation(), 6459 diag::err_using_decl_constructor_not_in_direct_base) 6460 << UD->getNameInfo().getSourceRange() 6461 << QualType(SourceType, 0) << TargetClass; 6462 return true; 6463 } 6464 6465 if (!CurContext->isDependentContext()) 6466 BaseIt->setInheritConstructors(); 6467 6468 return false; 6469} 6470 6471/// Checks that the given using declaration is not an invalid 6472/// redeclaration. Note that this is checking only for the using decl 6473/// itself, not for any ill-formedness among the UsingShadowDecls. 6474bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6475 bool isTypeName, 6476 const CXXScopeSpec &SS, 6477 SourceLocation NameLoc, 6478 const LookupResult &Prev) { 6479 // C++03 [namespace.udecl]p8: 6480 // C++0x [namespace.udecl]p10: 6481 // A using-declaration is a declaration and can therefore be used 6482 // repeatedly where (and only where) multiple declarations are 6483 // allowed. 6484 // 6485 // That's in non-member contexts. 6486 if (!CurContext->getRedeclContext()->isRecord()) 6487 return false; 6488 6489 NestedNameSpecifier *Qual 6490 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6491 6492 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6493 NamedDecl *D = *I; 6494 6495 bool DTypename; 6496 NestedNameSpecifier *DQual; 6497 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6498 DTypename = UD->isTypeName(); 6499 DQual = UD->getQualifier(); 6500 } else if (UnresolvedUsingValueDecl *UD 6501 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6502 DTypename = false; 6503 DQual = UD->getQualifier(); 6504 } else if (UnresolvedUsingTypenameDecl *UD 6505 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6506 DTypename = true; 6507 DQual = UD->getQualifier(); 6508 } else continue; 6509 6510 // using decls differ if one says 'typename' and the other doesn't. 6511 // FIXME: non-dependent using decls? 6512 if (isTypeName != DTypename) continue; 6513 6514 // using decls differ if they name different scopes (but note that 6515 // template instantiation can cause this check to trigger when it 6516 // didn't before instantiation). 6517 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6518 Context.getCanonicalNestedNameSpecifier(DQual)) 6519 continue; 6520 6521 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6522 Diag(D->getLocation(), diag::note_using_decl) << 1; 6523 return true; 6524 } 6525 6526 return false; 6527} 6528 6529 6530/// Checks that the given nested-name qualifier used in a using decl 6531/// in the current context is appropriately related to the current 6532/// scope. If an error is found, diagnoses it and returns true. 6533bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6534 const CXXScopeSpec &SS, 6535 SourceLocation NameLoc) { 6536 DeclContext *NamedContext = computeDeclContext(SS); 6537 6538 if (!CurContext->isRecord()) { 6539 // C++03 [namespace.udecl]p3: 6540 // C++0x [namespace.udecl]p8: 6541 // A using-declaration for a class member shall be a member-declaration. 6542 6543 // If we weren't able to compute a valid scope, it must be a 6544 // dependent class scope. 6545 if (!NamedContext || NamedContext->isRecord()) { 6546 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6547 << SS.getRange(); 6548 return true; 6549 } 6550 6551 // Otherwise, everything is known to be fine. 6552 return false; 6553 } 6554 6555 // The current scope is a record. 6556 6557 // If the named context is dependent, we can't decide much. 6558 if (!NamedContext) { 6559 // FIXME: in C++0x, we can diagnose if we can prove that the 6560 // nested-name-specifier does not refer to a base class, which is 6561 // still possible in some cases. 6562 6563 // Otherwise we have to conservatively report that things might be 6564 // okay. 6565 return false; 6566 } 6567 6568 if (!NamedContext->isRecord()) { 6569 // Ideally this would point at the last name in the specifier, 6570 // but we don't have that level of source info. 6571 Diag(SS.getRange().getBegin(), 6572 diag::err_using_decl_nested_name_specifier_is_not_class) 6573 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6574 return true; 6575 } 6576 6577 if (!NamedContext->isDependentContext() && 6578 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6579 return true; 6580 6581 if (getLangOpts().CPlusPlus0x) { 6582 // C++0x [namespace.udecl]p3: 6583 // In a using-declaration used as a member-declaration, the 6584 // nested-name-specifier shall name a base class of the class 6585 // being defined. 6586 6587 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6588 cast<CXXRecordDecl>(NamedContext))) { 6589 if (CurContext == NamedContext) { 6590 Diag(NameLoc, 6591 diag::err_using_decl_nested_name_specifier_is_current_class) 6592 << SS.getRange(); 6593 return true; 6594 } 6595 6596 Diag(SS.getRange().getBegin(), 6597 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6598 << (NestedNameSpecifier*) SS.getScopeRep() 6599 << cast<CXXRecordDecl>(CurContext) 6600 << SS.getRange(); 6601 return true; 6602 } 6603 6604 return false; 6605 } 6606 6607 // C++03 [namespace.udecl]p4: 6608 // A using-declaration used as a member-declaration shall refer 6609 // to a member of a base class of the class being defined [etc.]. 6610 6611 // Salient point: SS doesn't have to name a base class as long as 6612 // lookup only finds members from base classes. Therefore we can 6613 // diagnose here only if we can prove that that can't happen, 6614 // i.e. if the class hierarchies provably don't intersect. 6615 6616 // TODO: it would be nice if "definitely valid" results were cached 6617 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6618 // need to be repeated. 6619 6620 struct UserData { 6621 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 6622 6623 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6624 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6625 Data->Bases.insert(Base); 6626 return true; 6627 } 6628 6629 bool hasDependentBases(const CXXRecordDecl *Class) { 6630 return !Class->forallBases(collect, this); 6631 } 6632 6633 /// Returns true if the base is dependent or is one of the 6634 /// accumulated base classes. 6635 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6636 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6637 return !Data->Bases.count(Base); 6638 } 6639 6640 bool mightShareBases(const CXXRecordDecl *Class) { 6641 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6642 } 6643 }; 6644 6645 UserData Data; 6646 6647 // Returns false if we find a dependent base. 6648 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6649 return false; 6650 6651 // Returns false if the class has a dependent base or if it or one 6652 // of its bases is present in the base set of the current context. 6653 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6654 return false; 6655 6656 Diag(SS.getRange().getBegin(), 6657 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6658 << (NestedNameSpecifier*) SS.getScopeRep() 6659 << cast<CXXRecordDecl>(CurContext) 6660 << SS.getRange(); 6661 6662 return true; 6663} 6664 6665Decl *Sema::ActOnAliasDeclaration(Scope *S, 6666 AccessSpecifier AS, 6667 MultiTemplateParamsArg TemplateParamLists, 6668 SourceLocation UsingLoc, 6669 UnqualifiedId &Name, 6670 TypeResult Type) { 6671 // Skip up to the relevant declaration scope. 6672 while (S->getFlags() & Scope::TemplateParamScope) 6673 S = S->getParent(); 6674 assert((S->getFlags() & Scope::DeclScope) && 6675 "got alias-declaration outside of declaration scope"); 6676 6677 if (Type.isInvalid()) 6678 return 0; 6679 6680 bool Invalid = false; 6681 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6682 TypeSourceInfo *TInfo = 0; 6683 GetTypeFromParser(Type.get(), &TInfo); 6684 6685 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6686 return 0; 6687 6688 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6689 UPPC_DeclarationType)) { 6690 Invalid = true; 6691 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6692 TInfo->getTypeLoc().getBeginLoc()); 6693 } 6694 6695 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6696 LookupName(Previous, S); 6697 6698 // Warn about shadowing the name of a template parameter. 6699 if (Previous.isSingleResult() && 6700 Previous.getFoundDecl()->isTemplateParameter()) { 6701 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6702 Previous.clear(); 6703 } 6704 6705 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6706 "name in alias declaration must be an identifier"); 6707 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6708 Name.StartLocation, 6709 Name.Identifier, TInfo); 6710 6711 NewTD->setAccess(AS); 6712 6713 if (Invalid) 6714 NewTD->setInvalidDecl(); 6715 6716 CheckTypedefForVariablyModifiedType(S, NewTD); 6717 Invalid |= NewTD->isInvalidDecl(); 6718 6719 bool Redeclaration = false; 6720 6721 NamedDecl *NewND; 6722 if (TemplateParamLists.size()) { 6723 TypeAliasTemplateDecl *OldDecl = 0; 6724 TemplateParameterList *OldTemplateParams = 0; 6725 6726 if (TemplateParamLists.size() != 1) { 6727 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6728 << SourceRange(TemplateParamLists[1]->getTemplateLoc(), 6729 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); 6730 } 6731 TemplateParameterList *TemplateParams = TemplateParamLists[0]; 6732 6733 // Only consider previous declarations in the same scope. 6734 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6735 /*ExplicitInstantiationOrSpecialization*/false); 6736 if (!Previous.empty()) { 6737 Redeclaration = true; 6738 6739 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6740 if (!OldDecl && !Invalid) { 6741 Diag(UsingLoc, diag::err_redefinition_different_kind) 6742 << Name.Identifier; 6743 6744 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6745 if (OldD->getLocation().isValid()) 6746 Diag(OldD->getLocation(), diag::note_previous_definition); 6747 6748 Invalid = true; 6749 } 6750 6751 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6752 if (TemplateParameterListsAreEqual(TemplateParams, 6753 OldDecl->getTemplateParameters(), 6754 /*Complain=*/true, 6755 TPL_TemplateMatch)) 6756 OldTemplateParams = OldDecl->getTemplateParameters(); 6757 else 6758 Invalid = true; 6759 6760 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6761 if (!Invalid && 6762 !Context.hasSameType(OldTD->getUnderlyingType(), 6763 NewTD->getUnderlyingType())) { 6764 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6765 // but we can't reasonably accept it. 6766 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6767 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6768 if (OldTD->getLocation().isValid()) 6769 Diag(OldTD->getLocation(), diag::note_previous_definition); 6770 Invalid = true; 6771 } 6772 } 6773 } 6774 6775 // Merge any previous default template arguments into our parameters, 6776 // and check the parameter list. 6777 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6778 TPC_TypeAliasTemplate)) 6779 return 0; 6780 6781 TypeAliasTemplateDecl *NewDecl = 6782 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6783 Name.Identifier, TemplateParams, 6784 NewTD); 6785 6786 NewDecl->setAccess(AS); 6787 6788 if (Invalid) 6789 NewDecl->setInvalidDecl(); 6790 else if (OldDecl) 6791 NewDecl->setPreviousDeclaration(OldDecl); 6792 6793 NewND = NewDecl; 6794 } else { 6795 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6796 NewND = NewTD; 6797 } 6798 6799 if (!Redeclaration) 6800 PushOnScopeChains(NewND, S); 6801 6802 ActOnDocumentableDecl(NewND); 6803 return NewND; 6804} 6805 6806Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6807 SourceLocation NamespaceLoc, 6808 SourceLocation AliasLoc, 6809 IdentifierInfo *Alias, 6810 CXXScopeSpec &SS, 6811 SourceLocation IdentLoc, 6812 IdentifierInfo *Ident) { 6813 6814 // Lookup the namespace name. 6815 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6816 LookupParsedName(R, S, &SS); 6817 6818 // Check if we have a previous declaration with the same name. 6819 NamedDecl *PrevDecl 6820 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6821 ForRedeclaration); 6822 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6823 PrevDecl = 0; 6824 6825 if (PrevDecl) { 6826 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6827 // We already have an alias with the same name that points to the same 6828 // namespace, so don't create a new one. 6829 // FIXME: At some point, we'll want to create the (redundant) 6830 // declaration to maintain better source information. 6831 if (!R.isAmbiguous() && !R.empty() && 6832 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6833 return 0; 6834 } 6835 6836 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6837 diag::err_redefinition_different_kind; 6838 Diag(AliasLoc, DiagID) << Alias; 6839 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6840 return 0; 6841 } 6842 6843 if (R.isAmbiguous()) 6844 return 0; 6845 6846 if (R.empty()) { 6847 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6848 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6849 return 0; 6850 } 6851 } 6852 6853 NamespaceAliasDecl *AliasDecl = 6854 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6855 Alias, SS.getWithLocInContext(Context), 6856 IdentLoc, R.getFoundDecl()); 6857 6858 PushOnScopeChains(AliasDecl, S); 6859 return AliasDecl; 6860} 6861 6862Sema::ImplicitExceptionSpecification 6863Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 6864 CXXMethodDecl *MD) { 6865 CXXRecordDecl *ClassDecl = MD->getParent(); 6866 6867 // C++ [except.spec]p14: 6868 // An implicitly declared special member function (Clause 12) shall have an 6869 // exception-specification. [...] 6870 ImplicitExceptionSpecification ExceptSpec(*this); 6871 if (ClassDecl->isInvalidDecl()) 6872 return ExceptSpec; 6873 6874 // Direct base-class constructors. 6875 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6876 BEnd = ClassDecl->bases_end(); 6877 B != BEnd; ++B) { 6878 if (B->isVirtual()) // Handled below. 6879 continue; 6880 6881 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6882 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6883 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6884 // If this is a deleted function, add it anyway. This might be conformant 6885 // with the standard. This might not. I'm not sure. It might not matter. 6886 if (Constructor) 6887 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6888 } 6889 } 6890 6891 // Virtual base-class constructors. 6892 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6893 BEnd = ClassDecl->vbases_end(); 6894 B != BEnd; ++B) { 6895 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6896 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6897 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6898 // If this is a deleted function, add it anyway. This might be conformant 6899 // with the standard. This might not. I'm not sure. It might not matter. 6900 if (Constructor) 6901 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6902 } 6903 } 6904 6905 // Field constructors. 6906 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6907 FEnd = ClassDecl->field_end(); 6908 F != FEnd; ++F) { 6909 if (F->hasInClassInitializer()) { 6910 if (Expr *E = F->getInClassInitializer()) 6911 ExceptSpec.CalledExpr(E); 6912 else if (!F->isInvalidDecl()) 6913 // DR1351: 6914 // If the brace-or-equal-initializer of a non-static data member 6915 // invokes a defaulted default constructor of its class or of an 6916 // enclosing class in a potentially evaluated subexpression, the 6917 // program is ill-formed. 6918 // 6919 // This resolution is unworkable: the exception specification of the 6920 // default constructor can be needed in an unevaluated context, in 6921 // particular, in the operand of a noexcept-expression, and we can be 6922 // unable to compute an exception specification for an enclosed class. 6923 // 6924 // We do not allow an in-class initializer to require the evaluation 6925 // of the exception specification for any in-class initializer whose 6926 // definition is not lexically complete. 6927 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 6928 } else if (const RecordType *RecordTy 6929 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6930 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6931 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6932 // If this is a deleted function, add it anyway. This might be conformant 6933 // with the standard. This might not. I'm not sure. It might not matter. 6934 // In particular, the problem is that this function never gets called. It 6935 // might just be ill-formed because this function attempts to refer to 6936 // a deleted function here. 6937 if (Constructor) 6938 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 6939 } 6940 } 6941 6942 return ExceptSpec; 6943} 6944 6945CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6946 CXXRecordDecl *ClassDecl) { 6947 // C++ [class.ctor]p5: 6948 // A default constructor for a class X is a constructor of class X 6949 // that can be called without an argument. If there is no 6950 // user-declared constructor for class X, a default constructor is 6951 // implicitly declared. An implicitly-declared default constructor 6952 // is an inline public member of its class. 6953 assert(!ClassDecl->hasUserDeclaredConstructor() && 6954 "Should not build implicit default constructor!"); 6955 6956 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 6957 CXXDefaultConstructor, 6958 false); 6959 6960 // Create the actual constructor declaration. 6961 CanQualType ClassType 6962 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6963 SourceLocation ClassLoc = ClassDecl->getLocation(); 6964 DeclarationName Name 6965 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6966 DeclarationNameInfo NameInfo(Name, ClassLoc); 6967 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6968 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 6969 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6970 Constexpr); 6971 DefaultCon->setAccess(AS_public); 6972 DefaultCon->setDefaulted(); 6973 DefaultCon->setImplicit(); 6974 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6975 6976 // Build an exception specification pointing back at this constructor. 6977 FunctionProtoType::ExtProtoInfo EPI; 6978 EPI.ExceptionSpecType = EST_Unevaluated; 6979 EPI.ExceptionSpecDecl = DefaultCon; 6980 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6981 6982 // Note that we have declared this constructor. 6983 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6984 6985 if (Scope *S = getScopeForContext(ClassDecl)) 6986 PushOnScopeChains(DefaultCon, S, false); 6987 ClassDecl->addDecl(DefaultCon); 6988 6989 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6990 DefaultCon->setDeletedAsWritten(); 6991 6992 return DefaultCon; 6993} 6994 6995void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6996 CXXConstructorDecl *Constructor) { 6997 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6998 !Constructor->doesThisDeclarationHaveABody() && 6999 !Constructor->isDeleted()) && 7000 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 7001 7002 CXXRecordDecl *ClassDecl = Constructor->getParent(); 7003 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 7004 7005 SynthesizedFunctionScope Scope(*this, Constructor); 7006 DiagnosticErrorTrap Trap(Diags); 7007 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 7008 Trap.hasErrorOccurred()) { 7009 Diag(CurrentLocation, diag::note_member_synthesized_at) 7010 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 7011 Constructor->setInvalidDecl(); 7012 return; 7013 } 7014 7015 SourceLocation Loc = Constructor->getLocation(); 7016 Constructor->setBody(new (Context) CompoundStmt(Loc)); 7017 7018 Constructor->setUsed(); 7019 MarkVTableUsed(CurrentLocation, ClassDecl); 7020 7021 if (ASTMutationListener *L = getASTMutationListener()) { 7022 L->CompletedImplicitDefinition(Constructor); 7023 } 7024} 7025 7026void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 7027 if (!D) return; 7028 AdjustDeclIfTemplate(D); 7029 7030 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 7031 7032 if (!ClassDecl->isDependentType()) 7033 CheckExplicitlyDefaultedMethods(ClassDecl); 7034} 7035 7036void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 7037 // We start with an initial pass over the base classes to collect those that 7038 // inherit constructors from. If there are none, we can forgo all further 7039 // processing. 7040 typedef SmallVector<const RecordType *, 4> BasesVector; 7041 BasesVector BasesToInheritFrom; 7042 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 7043 BaseE = ClassDecl->bases_end(); 7044 BaseIt != BaseE; ++BaseIt) { 7045 if (BaseIt->getInheritConstructors()) { 7046 QualType Base = BaseIt->getType(); 7047 if (Base->isDependentType()) { 7048 // If we inherit constructors from anything that is dependent, just 7049 // abort processing altogether. We'll get another chance for the 7050 // instantiations. 7051 return; 7052 } 7053 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 7054 } 7055 } 7056 if (BasesToInheritFrom.empty()) 7057 return; 7058 7059 // Now collect the constructors that we already have in the current class. 7060 // Those take precedence over inherited constructors. 7061 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7062 // unless there is a user-declared constructor with the same signature in 7063 // the class where the using-declaration appears. 7064 llvm::SmallSet<const Type *, 8> ExistingConstructors; 7065 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 7066 CtorE = ClassDecl->ctor_end(); 7067 CtorIt != CtorE; ++CtorIt) { 7068 ExistingConstructors.insert( 7069 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 7070 } 7071 7072 DeclarationName CreatedCtorName = 7073 Context.DeclarationNames.getCXXConstructorName( 7074 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 7075 7076 // Now comes the true work. 7077 // First, we keep a map from constructor types to the base that introduced 7078 // them. Needed for finding conflicting constructors. We also keep the 7079 // actually inserted declarations in there, for pretty diagnostics. 7080 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 7081 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 7082 ConstructorToSourceMap InheritedConstructors; 7083 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 7084 BaseE = BasesToInheritFrom.end(); 7085 BaseIt != BaseE; ++BaseIt) { 7086 const RecordType *Base = *BaseIt; 7087 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 7088 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 7089 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 7090 CtorE = BaseDecl->ctor_end(); 7091 CtorIt != CtorE; ++CtorIt) { 7092 // Find the using declaration for inheriting this base's constructors. 7093 // FIXME: Don't perform name lookup just to obtain a source location! 7094 DeclarationName Name = 7095 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7096 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 7097 LookupQualifiedName(Result, CurContext); 7098 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 7099 SourceLocation UsingLoc = UD ? UD->getLocation() : 7100 ClassDecl->getLocation(); 7101 7102 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 7103 // from the class X named in the using-declaration consists of actual 7104 // constructors and notional constructors that result from the 7105 // transformation of defaulted parameters as follows: 7106 // - all non-template default constructors of X, and 7107 // - for each non-template constructor of X that has at least one 7108 // parameter with a default argument, the set of constructors that 7109 // results from omitting any ellipsis parameter specification and 7110 // successively omitting parameters with a default argument from the 7111 // end of the parameter-type-list. 7112 CXXConstructorDecl *BaseCtor = *CtorIt; 7113 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7114 const FunctionProtoType *BaseCtorType = 7115 BaseCtor->getType()->getAs<FunctionProtoType>(); 7116 7117 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7118 maxParams = BaseCtor->getNumParams(); 7119 params <= maxParams; ++params) { 7120 // Skip default constructors. They're never inherited. 7121 if (params == 0) 7122 continue; 7123 // Skip copy and move constructors for the same reason. 7124 if (CanBeCopyOrMove && params == 1) 7125 continue; 7126 7127 // Build up a function type for this particular constructor. 7128 // FIXME: The working paper does not consider that the exception spec 7129 // for the inheriting constructor might be larger than that of the 7130 // source. This code doesn't yet, either. When it does, this code will 7131 // need to be delayed until after exception specifications and in-class 7132 // member initializers are attached. 7133 const Type *NewCtorType; 7134 if (params == maxParams) 7135 NewCtorType = BaseCtorType; 7136 else { 7137 SmallVector<QualType, 16> Args; 7138 for (unsigned i = 0; i < params; ++i) { 7139 Args.push_back(BaseCtorType->getArgType(i)); 7140 } 7141 FunctionProtoType::ExtProtoInfo ExtInfo = 7142 BaseCtorType->getExtProtoInfo(); 7143 ExtInfo.Variadic = false; 7144 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7145 Args.data(), params, ExtInfo) 7146 .getTypePtr(); 7147 } 7148 const Type *CanonicalNewCtorType = 7149 Context.getCanonicalType(NewCtorType); 7150 7151 // Now that we have the type, first check if the class already has a 7152 // constructor with this signature. 7153 if (ExistingConstructors.count(CanonicalNewCtorType)) 7154 continue; 7155 7156 // Then we check if we have already declared an inherited constructor 7157 // with this signature. 7158 std::pair<ConstructorToSourceMap::iterator, bool> result = 7159 InheritedConstructors.insert(std::make_pair( 7160 CanonicalNewCtorType, 7161 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7162 if (!result.second) { 7163 // Already in the map. If it came from a different class, that's an 7164 // error. Not if it's from the same. 7165 CanQualType PreviousBase = result.first->second.first; 7166 if (CanonicalBase != PreviousBase) { 7167 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7168 const CXXConstructorDecl *PrevBaseCtor = 7169 PrevCtor->getInheritedConstructor(); 7170 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7171 7172 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7173 Diag(BaseCtor->getLocation(), 7174 diag::note_using_decl_constructor_conflict_current_ctor); 7175 Diag(PrevBaseCtor->getLocation(), 7176 diag::note_using_decl_constructor_conflict_previous_ctor); 7177 Diag(PrevCtor->getLocation(), 7178 diag::note_using_decl_constructor_conflict_previous_using); 7179 } 7180 continue; 7181 } 7182 7183 // OK, we're there, now add the constructor. 7184 // C++0x [class.inhctor]p8: [...] that would be performed by a 7185 // user-written inline constructor [...] 7186 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7187 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7188 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7189 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7190 /*ImplicitlyDeclared=*/true, 7191 // FIXME: Due to a defect in the standard, we treat inherited 7192 // constructors as constexpr even if that makes them ill-formed. 7193 /*Constexpr=*/BaseCtor->isConstexpr()); 7194 NewCtor->setAccess(BaseCtor->getAccess()); 7195 7196 // Build up the parameter decls and add them. 7197 SmallVector<ParmVarDecl *, 16> ParamDecls; 7198 for (unsigned i = 0; i < params; ++i) { 7199 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7200 UsingLoc, UsingLoc, 7201 /*IdentifierInfo=*/0, 7202 BaseCtorType->getArgType(i), 7203 /*TInfo=*/0, SC_None, 7204 SC_None, /*DefaultArg=*/0)); 7205 } 7206 NewCtor->setParams(ParamDecls); 7207 NewCtor->setInheritedConstructor(BaseCtor); 7208 7209 ClassDecl->addDecl(NewCtor); 7210 result.first->second.second = NewCtor; 7211 } 7212 } 7213 } 7214} 7215 7216Sema::ImplicitExceptionSpecification 7217Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 7218 CXXRecordDecl *ClassDecl = MD->getParent(); 7219 7220 // C++ [except.spec]p14: 7221 // An implicitly declared special member function (Clause 12) shall have 7222 // an exception-specification. 7223 ImplicitExceptionSpecification ExceptSpec(*this); 7224 if (ClassDecl->isInvalidDecl()) 7225 return ExceptSpec; 7226 7227 // Direct base-class destructors. 7228 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7229 BEnd = ClassDecl->bases_end(); 7230 B != BEnd; ++B) { 7231 if (B->isVirtual()) // Handled below. 7232 continue; 7233 7234 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7235 ExceptSpec.CalledDecl(B->getLocStart(), 7236 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7237 } 7238 7239 // Virtual base-class destructors. 7240 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7241 BEnd = ClassDecl->vbases_end(); 7242 B != BEnd; ++B) { 7243 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7244 ExceptSpec.CalledDecl(B->getLocStart(), 7245 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7246 } 7247 7248 // Field destructors. 7249 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7250 FEnd = ClassDecl->field_end(); 7251 F != FEnd; ++F) { 7252 if (const RecordType *RecordTy 7253 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7254 ExceptSpec.CalledDecl(F->getLocation(), 7255 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7256 } 7257 7258 return ExceptSpec; 7259} 7260 7261CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7262 // C++ [class.dtor]p2: 7263 // If a class has no user-declared destructor, a destructor is 7264 // declared implicitly. An implicitly-declared destructor is an 7265 // inline public member of its class. 7266 7267 // Create the actual destructor declaration. 7268 CanQualType ClassType 7269 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7270 SourceLocation ClassLoc = ClassDecl->getLocation(); 7271 DeclarationName Name 7272 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7273 DeclarationNameInfo NameInfo(Name, ClassLoc); 7274 CXXDestructorDecl *Destructor 7275 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7276 QualType(), 0, /*isInline=*/true, 7277 /*isImplicitlyDeclared=*/true); 7278 Destructor->setAccess(AS_public); 7279 Destructor->setDefaulted(); 7280 Destructor->setImplicit(); 7281 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7282 7283 // Build an exception specification pointing back at this destructor. 7284 FunctionProtoType::ExtProtoInfo EPI; 7285 EPI.ExceptionSpecType = EST_Unevaluated; 7286 EPI.ExceptionSpecDecl = Destructor; 7287 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7288 7289 // Note that we have declared this destructor. 7290 ++ASTContext::NumImplicitDestructorsDeclared; 7291 7292 // Introduce this destructor into its scope. 7293 if (Scope *S = getScopeForContext(ClassDecl)) 7294 PushOnScopeChains(Destructor, S, false); 7295 ClassDecl->addDecl(Destructor); 7296 7297 AddOverriddenMethods(ClassDecl, Destructor); 7298 7299 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7300 Destructor->setDeletedAsWritten(); 7301 7302 return Destructor; 7303} 7304 7305void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7306 CXXDestructorDecl *Destructor) { 7307 assert((Destructor->isDefaulted() && 7308 !Destructor->doesThisDeclarationHaveABody() && 7309 !Destructor->isDeleted()) && 7310 "DefineImplicitDestructor - call it for implicit default dtor"); 7311 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7312 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7313 7314 if (Destructor->isInvalidDecl()) 7315 return; 7316 7317 SynthesizedFunctionScope Scope(*this, Destructor); 7318 7319 DiagnosticErrorTrap Trap(Diags); 7320 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7321 Destructor->getParent()); 7322 7323 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7324 Diag(CurrentLocation, diag::note_member_synthesized_at) 7325 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7326 7327 Destructor->setInvalidDecl(); 7328 return; 7329 } 7330 7331 SourceLocation Loc = Destructor->getLocation(); 7332 Destructor->setBody(new (Context) CompoundStmt(Loc)); 7333 Destructor->setImplicitlyDefined(true); 7334 Destructor->setUsed(); 7335 MarkVTableUsed(CurrentLocation, ClassDecl); 7336 7337 if (ASTMutationListener *L = getASTMutationListener()) { 7338 L->CompletedImplicitDefinition(Destructor); 7339 } 7340} 7341 7342/// \brief Perform any semantic analysis which needs to be delayed until all 7343/// pending class member declarations have been parsed. 7344void Sema::ActOnFinishCXXMemberDecls() { 7345 // Perform any deferred checking of exception specifications for virtual 7346 // destructors. 7347 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 7348 i != e; ++i) { 7349 const CXXDestructorDecl *Dtor = 7350 DelayedDestructorExceptionSpecChecks[i].first; 7351 assert(!Dtor->getParent()->isDependentType() && 7352 "Should not ever add destructors of templates into the list."); 7353 CheckOverridingFunctionExceptionSpec(Dtor, 7354 DelayedDestructorExceptionSpecChecks[i].second); 7355 } 7356 DelayedDestructorExceptionSpecChecks.clear(); 7357} 7358 7359void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 7360 CXXDestructorDecl *Destructor) { 7361 assert(getLangOpts().CPlusPlus0x && 7362 "adjusting dtor exception specs was introduced in c++11"); 7363 7364 // C++11 [class.dtor]p3: 7365 // A declaration of a destructor that does not have an exception- 7366 // specification is implicitly considered to have the same exception- 7367 // specification as an implicit declaration. 7368 const FunctionProtoType *DtorType = Destructor->getType()-> 7369 getAs<FunctionProtoType>(); 7370 if (DtorType->hasExceptionSpec()) 7371 return; 7372 7373 // Replace the destructor's type, building off the existing one. Fortunately, 7374 // the only thing of interest in the destructor type is its extended info. 7375 // The return and arguments are fixed. 7376 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 7377 EPI.ExceptionSpecType = EST_Unevaluated; 7378 EPI.ExceptionSpecDecl = Destructor; 7379 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7380 7381 // FIXME: If the destructor has a body that could throw, and the newly created 7382 // spec doesn't allow exceptions, we should emit a warning, because this 7383 // change in behavior can break conforming C++03 programs at runtime. 7384 // However, we don't have a body or an exception specification yet, so it 7385 // needs to be done somewhere else. 7386} 7387 7388/// \brief Builds a statement that copies/moves the given entity from \p From to 7389/// \c To. 7390/// 7391/// This routine is used to copy/move the members of a class with an 7392/// implicitly-declared copy/move assignment operator. When the entities being 7393/// copied are arrays, this routine builds for loops to copy them. 7394/// 7395/// \param S The Sema object used for type-checking. 7396/// 7397/// \param Loc The location where the implicit copy/move is being generated. 7398/// 7399/// \param T The type of the expressions being copied/moved. Both expressions 7400/// must have this type. 7401/// 7402/// \param To The expression we are copying/moving to. 7403/// 7404/// \param From The expression we are copying/moving from. 7405/// 7406/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7407/// Otherwise, it's a non-static member subobject. 7408/// 7409/// \param Copying Whether we're copying or moving. 7410/// 7411/// \param Depth Internal parameter recording the depth of the recursion. 7412/// 7413/// \returns A statement or a loop that copies the expressions. 7414static StmtResult 7415BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7416 Expr *To, Expr *From, 7417 bool CopyingBaseSubobject, bool Copying, 7418 unsigned Depth = 0) { 7419 // C++0x [class.copy]p28: 7420 // Each subobject is assigned in the manner appropriate to its type: 7421 // 7422 // - if the subobject is of class type, as if by a call to operator= with 7423 // the subobject as the object expression and the corresponding 7424 // subobject of x as a single function argument (as if by explicit 7425 // qualification; that is, ignoring any possible virtual overriding 7426 // functions in more derived classes); 7427 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7428 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7429 7430 // Look for operator=. 7431 DeclarationName Name 7432 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7433 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7434 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7435 7436 // Filter out any result that isn't a copy/move-assignment operator. 7437 LookupResult::Filter F = OpLookup.makeFilter(); 7438 while (F.hasNext()) { 7439 NamedDecl *D = F.next(); 7440 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7441 if (Method->isCopyAssignmentOperator() || 7442 (!Copying && Method->isMoveAssignmentOperator())) 7443 continue; 7444 7445 F.erase(); 7446 } 7447 F.done(); 7448 7449 // Suppress the protected check (C++ [class.protected]) for each of the 7450 // assignment operators we found. This strange dance is required when 7451 // we're assigning via a base classes's copy-assignment operator. To 7452 // ensure that we're getting the right base class subobject (without 7453 // ambiguities), we need to cast "this" to that subobject type; to 7454 // ensure that we don't go through the virtual call mechanism, we need 7455 // to qualify the operator= name with the base class (see below). However, 7456 // this means that if the base class has a protected copy assignment 7457 // operator, the protected member access check will fail. So, we 7458 // rewrite "protected" access to "public" access in this case, since we 7459 // know by construction that we're calling from a derived class. 7460 if (CopyingBaseSubobject) { 7461 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7462 L != LEnd; ++L) { 7463 if (L.getAccess() == AS_protected) 7464 L.setAccess(AS_public); 7465 } 7466 } 7467 7468 // Create the nested-name-specifier that will be used to qualify the 7469 // reference to operator=; this is required to suppress the virtual 7470 // call mechanism. 7471 CXXScopeSpec SS; 7472 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7473 SS.MakeTrivial(S.Context, 7474 NestedNameSpecifier::Create(S.Context, 0, false, 7475 CanonicalT), 7476 Loc); 7477 7478 // Create the reference to operator=. 7479 ExprResult OpEqualRef 7480 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7481 /*TemplateKWLoc=*/SourceLocation(), 7482 /*FirstQualifierInScope=*/0, 7483 OpLookup, 7484 /*TemplateArgs=*/0, 7485 /*SuppressQualifierCheck=*/true); 7486 if (OpEqualRef.isInvalid()) 7487 return StmtError(); 7488 7489 // Build the call to the assignment operator. 7490 7491 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7492 OpEqualRef.takeAs<Expr>(), 7493 Loc, &From, 1, Loc); 7494 if (Call.isInvalid()) 7495 return StmtError(); 7496 7497 return S.Owned(Call.takeAs<Stmt>()); 7498 } 7499 7500 // - if the subobject is of scalar type, the built-in assignment 7501 // operator is used. 7502 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7503 if (!ArrayTy) { 7504 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7505 if (Assignment.isInvalid()) 7506 return StmtError(); 7507 7508 return S.Owned(Assignment.takeAs<Stmt>()); 7509 } 7510 7511 // - if the subobject is an array, each element is assigned, in the 7512 // manner appropriate to the element type; 7513 7514 // Construct a loop over the array bounds, e.g., 7515 // 7516 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7517 // 7518 // that will copy each of the array elements. 7519 QualType SizeType = S.Context.getSizeType(); 7520 7521 // Create the iteration variable. 7522 IdentifierInfo *IterationVarName = 0; 7523 { 7524 SmallString<8> Str; 7525 llvm::raw_svector_ostream OS(Str); 7526 OS << "__i" << Depth; 7527 IterationVarName = &S.Context.Idents.get(OS.str()); 7528 } 7529 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7530 IterationVarName, SizeType, 7531 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7532 SC_None, SC_None); 7533 7534 // Initialize the iteration variable to zero. 7535 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7536 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7537 7538 // Create a reference to the iteration variable; we'll use this several 7539 // times throughout. 7540 Expr *IterationVarRef 7541 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7542 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7543 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7544 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7545 7546 // Create the DeclStmt that holds the iteration variable. 7547 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7548 7549 // Create the comparison against the array bound. 7550 llvm::APInt Upper 7551 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7552 Expr *Comparison 7553 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7554 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7555 BO_NE, S.Context.BoolTy, 7556 VK_RValue, OK_Ordinary, Loc, false); 7557 7558 // Create the pre-increment of the iteration variable. 7559 Expr *Increment 7560 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7561 VK_LValue, OK_Ordinary, Loc); 7562 7563 // Subscript the "from" and "to" expressions with the iteration variable. 7564 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7565 IterationVarRefRVal, 7566 Loc)); 7567 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7568 IterationVarRefRVal, 7569 Loc)); 7570 if (!Copying) // Cast to rvalue 7571 From = CastForMoving(S, From); 7572 7573 // Build the copy/move for an individual element of the array. 7574 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7575 To, From, CopyingBaseSubobject, 7576 Copying, Depth + 1); 7577 if (Copy.isInvalid()) 7578 return StmtError(); 7579 7580 // Construct the loop that copies all elements of this array. 7581 return S.ActOnForStmt(Loc, Loc, InitStmt, 7582 S.MakeFullExpr(Comparison), 7583 0, S.MakeFullExpr(Increment), 7584 Loc, Copy.take()); 7585} 7586 7587/// Determine whether an implicit copy assignment operator for ClassDecl has a 7588/// const argument. 7589/// FIXME: It ought to be possible to store this on the record. 7590static bool isImplicitCopyAssignmentArgConst(Sema &S, 7591 CXXRecordDecl *ClassDecl) { 7592 if (ClassDecl->isInvalidDecl()) 7593 return true; 7594 7595 // C++ [class.copy]p10: 7596 // If the class definition does not explicitly declare a copy 7597 // assignment operator, one is declared implicitly. 7598 // The implicitly-defined copy assignment operator for a class X 7599 // will have the form 7600 // 7601 // X& X::operator=(const X&) 7602 // 7603 // if 7604 // -- each direct base class B of X has a copy assignment operator 7605 // whose parameter is of type const B&, const volatile B& or B, 7606 // and 7607 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7608 BaseEnd = ClassDecl->bases_end(); 7609 Base != BaseEnd; ++Base) { 7610 // We'll handle this below 7611 if (S.getLangOpts().CPlusPlus0x && Base->isVirtual()) 7612 continue; 7613 7614 assert(!Base->getType()->isDependentType() && 7615 "Cannot generate implicit members for class with dependent bases."); 7616 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7617 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0)) 7618 return false; 7619 } 7620 7621 // In C++11, the above citation has "or virtual" added 7622 if (S.getLangOpts().CPlusPlus0x) { 7623 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7624 BaseEnd = ClassDecl->vbases_end(); 7625 Base != BaseEnd; ++Base) { 7626 assert(!Base->getType()->isDependentType() && 7627 "Cannot generate implicit members for class with dependent bases."); 7628 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7629 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7630 false, 0)) 7631 return false; 7632 } 7633 } 7634 7635 // -- for all the nonstatic data members of X that are of a class 7636 // type M (or array thereof), each such class type has a copy 7637 // assignment operator whose parameter is of type const M&, 7638 // const volatile M& or M. 7639 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7640 FieldEnd = ClassDecl->field_end(); 7641 Field != FieldEnd; ++Field) { 7642 QualType FieldType = S.Context.getBaseElementType(Field->getType()); 7643 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) 7644 if (!S.LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, 7645 false, 0)) 7646 return false; 7647 } 7648 7649 // Otherwise, the implicitly declared copy assignment operator will 7650 // have the form 7651 // 7652 // X& X::operator=(X&) 7653 7654 return true; 7655} 7656 7657Sema::ImplicitExceptionSpecification 7658Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 7659 CXXRecordDecl *ClassDecl = MD->getParent(); 7660 7661 ImplicitExceptionSpecification ExceptSpec(*this); 7662 if (ClassDecl->isInvalidDecl()) 7663 return ExceptSpec; 7664 7665 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 7666 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 7667 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 7668 7669 // C++ [except.spec]p14: 7670 // An implicitly declared special member function (Clause 12) shall have an 7671 // exception-specification. [...] 7672 7673 // It is unspecified whether or not an implicit copy assignment operator 7674 // attempts to deduplicate calls to assignment operators of virtual bases are 7675 // made. As such, this exception specification is effectively unspecified. 7676 // Based on a similar decision made for constness in C++0x, we're erring on 7677 // the side of assuming such calls to be made regardless of whether they 7678 // actually happen. 7679 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7680 BaseEnd = ClassDecl->bases_end(); 7681 Base != BaseEnd; ++Base) { 7682 if (Base->isVirtual()) 7683 continue; 7684 7685 CXXRecordDecl *BaseClassDecl 7686 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7687 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7688 ArgQuals, false, 0)) 7689 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7690 } 7691 7692 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7693 BaseEnd = ClassDecl->vbases_end(); 7694 Base != BaseEnd; ++Base) { 7695 CXXRecordDecl *BaseClassDecl 7696 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7697 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7698 ArgQuals, false, 0)) 7699 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7700 } 7701 7702 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7703 FieldEnd = ClassDecl->field_end(); 7704 Field != FieldEnd; 7705 ++Field) { 7706 QualType FieldType = Context.getBaseElementType(Field->getType()); 7707 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7708 if (CXXMethodDecl *CopyAssign = 7709 LookupCopyingAssignment(FieldClassDecl, 7710 ArgQuals | FieldType.getCVRQualifiers(), 7711 false, 0)) 7712 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 7713 } 7714 } 7715 7716 return ExceptSpec; 7717} 7718 7719CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7720 // Note: The following rules are largely analoguous to the copy 7721 // constructor rules. Note that virtual bases are not taken into account 7722 // for determining the argument type of the operator. Note also that 7723 // operators taking an object instead of a reference are allowed. 7724 7725 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7726 QualType RetType = Context.getLValueReferenceType(ArgType); 7727 if (isImplicitCopyAssignmentArgConst(*this, ClassDecl)) 7728 ArgType = ArgType.withConst(); 7729 ArgType = Context.getLValueReferenceType(ArgType); 7730 7731 // An implicitly-declared copy assignment operator is an inline public 7732 // member of its class. 7733 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7734 SourceLocation ClassLoc = ClassDecl->getLocation(); 7735 DeclarationNameInfo NameInfo(Name, ClassLoc); 7736 CXXMethodDecl *CopyAssignment 7737 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 7738 /*TInfo=*/0, /*isStatic=*/false, 7739 /*StorageClassAsWritten=*/SC_None, 7740 /*isInline=*/true, /*isConstexpr=*/false, 7741 SourceLocation()); 7742 CopyAssignment->setAccess(AS_public); 7743 CopyAssignment->setDefaulted(); 7744 CopyAssignment->setImplicit(); 7745 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7746 7747 // Build an exception specification pointing back at this member. 7748 FunctionProtoType::ExtProtoInfo EPI; 7749 EPI.ExceptionSpecType = EST_Unevaluated; 7750 EPI.ExceptionSpecDecl = CopyAssignment; 7751 CopyAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 7752 7753 // Add the parameter to the operator. 7754 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7755 ClassLoc, ClassLoc, /*Id=*/0, 7756 ArgType, /*TInfo=*/0, 7757 SC_None, 7758 SC_None, 0); 7759 CopyAssignment->setParams(FromParam); 7760 7761 // Note that we have added this copy-assignment operator. 7762 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7763 7764 if (Scope *S = getScopeForContext(ClassDecl)) 7765 PushOnScopeChains(CopyAssignment, S, false); 7766 ClassDecl->addDecl(CopyAssignment); 7767 7768 // C++0x [class.copy]p19: 7769 // .... If the class definition does not explicitly declare a copy 7770 // assignment operator, there is no user-declared move constructor, and 7771 // there is no user-declared move assignment operator, a copy assignment 7772 // operator is implicitly declared as defaulted. 7773 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7774 CopyAssignment->setDeletedAsWritten(); 7775 7776 AddOverriddenMethods(ClassDecl, CopyAssignment); 7777 return CopyAssignment; 7778} 7779 7780void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7781 CXXMethodDecl *CopyAssignOperator) { 7782 assert((CopyAssignOperator->isDefaulted() && 7783 CopyAssignOperator->isOverloadedOperator() && 7784 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7785 !CopyAssignOperator->doesThisDeclarationHaveABody() && 7786 !CopyAssignOperator->isDeleted()) && 7787 "DefineImplicitCopyAssignment called for wrong function"); 7788 7789 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7790 7791 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7792 CopyAssignOperator->setInvalidDecl(); 7793 return; 7794 } 7795 7796 CopyAssignOperator->setUsed(); 7797 7798 SynthesizedFunctionScope Scope(*this, CopyAssignOperator); 7799 DiagnosticErrorTrap Trap(Diags); 7800 7801 // C++0x [class.copy]p30: 7802 // The implicitly-defined or explicitly-defaulted copy assignment operator 7803 // for a non-union class X performs memberwise copy assignment of its 7804 // subobjects. The direct base classes of X are assigned first, in the 7805 // order of their declaration in the base-specifier-list, and then the 7806 // immediate non-static data members of X are assigned, in the order in 7807 // which they were declared in the class definition. 7808 7809 // The statements that form the synthesized function body. 7810 SmallVector<Stmt*, 8> Statements; 7811 7812 // The parameter for the "other" object, which we are copying from. 7813 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7814 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7815 QualType OtherRefType = Other->getType(); 7816 if (const LValueReferenceType *OtherRef 7817 = OtherRefType->getAs<LValueReferenceType>()) { 7818 OtherRefType = OtherRef->getPointeeType(); 7819 OtherQuals = OtherRefType.getQualifiers(); 7820 } 7821 7822 // Our location for everything implicitly-generated. 7823 SourceLocation Loc = CopyAssignOperator->getLocation(); 7824 7825 // Construct a reference to the "other" object. We'll be using this 7826 // throughout the generated ASTs. 7827 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7828 assert(OtherRef && "Reference to parameter cannot fail!"); 7829 7830 // Construct the "this" pointer. We'll be using this throughout the generated 7831 // ASTs. 7832 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7833 assert(This && "Reference to this cannot fail!"); 7834 7835 // Assign base classes. 7836 bool Invalid = false; 7837 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7838 E = ClassDecl->bases_end(); Base != E; ++Base) { 7839 // Form the assignment: 7840 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7841 QualType BaseType = Base->getType().getUnqualifiedType(); 7842 if (!BaseType->isRecordType()) { 7843 Invalid = true; 7844 continue; 7845 } 7846 7847 CXXCastPath BasePath; 7848 BasePath.push_back(Base); 7849 7850 // Construct the "from" expression, which is an implicit cast to the 7851 // appropriately-qualified base type. 7852 Expr *From = OtherRef; 7853 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7854 CK_UncheckedDerivedToBase, 7855 VK_LValue, &BasePath).take(); 7856 7857 // Dereference "this". 7858 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7859 7860 // Implicitly cast "this" to the appropriately-qualified base type. 7861 To = ImpCastExprToType(To.take(), 7862 Context.getCVRQualifiedType(BaseType, 7863 CopyAssignOperator->getTypeQualifiers()), 7864 CK_UncheckedDerivedToBase, 7865 VK_LValue, &BasePath); 7866 7867 // Build the copy. 7868 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7869 To.get(), From, 7870 /*CopyingBaseSubobject=*/true, 7871 /*Copying=*/true); 7872 if (Copy.isInvalid()) { 7873 Diag(CurrentLocation, diag::note_member_synthesized_at) 7874 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7875 CopyAssignOperator->setInvalidDecl(); 7876 return; 7877 } 7878 7879 // Success! Record the copy. 7880 Statements.push_back(Copy.takeAs<Expr>()); 7881 } 7882 7883 // \brief Reference to the __builtin_memcpy function. 7884 Expr *BuiltinMemCpyRef = 0; 7885 // \brief Reference to the __builtin_objc_memmove_collectable function. 7886 Expr *CollectableMemCpyRef = 0; 7887 7888 // Assign non-static members. 7889 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7890 FieldEnd = ClassDecl->field_end(); 7891 Field != FieldEnd; ++Field) { 7892 if (Field->isUnnamedBitfield()) 7893 continue; 7894 7895 // Check for members of reference type; we can't copy those. 7896 if (Field->getType()->isReferenceType()) { 7897 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7898 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7899 Diag(Field->getLocation(), diag::note_declared_at); 7900 Diag(CurrentLocation, diag::note_member_synthesized_at) 7901 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7902 Invalid = true; 7903 continue; 7904 } 7905 7906 // Check for members of const-qualified, non-class type. 7907 QualType BaseType = Context.getBaseElementType(Field->getType()); 7908 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7909 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7910 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7911 Diag(Field->getLocation(), diag::note_declared_at); 7912 Diag(CurrentLocation, diag::note_member_synthesized_at) 7913 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7914 Invalid = true; 7915 continue; 7916 } 7917 7918 // Suppress assigning zero-width bitfields. 7919 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7920 continue; 7921 7922 QualType FieldType = Field->getType().getNonReferenceType(); 7923 if (FieldType->isIncompleteArrayType()) { 7924 assert(ClassDecl->hasFlexibleArrayMember() && 7925 "Incomplete array type is not valid"); 7926 continue; 7927 } 7928 7929 // Build references to the field in the object we're copying from and to. 7930 CXXScopeSpec SS; // Intentionally empty 7931 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7932 LookupMemberName); 7933 MemberLookup.addDecl(*Field); 7934 MemberLookup.resolveKind(); 7935 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7936 Loc, /*IsArrow=*/false, 7937 SS, SourceLocation(), 0, 7938 MemberLookup, 0); 7939 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7940 Loc, /*IsArrow=*/true, 7941 SS, SourceLocation(), 0, 7942 MemberLookup, 0); 7943 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7944 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7945 7946 // If the field should be copied with __builtin_memcpy rather than via 7947 // explicit assignments, do so. This optimization only applies for arrays 7948 // of scalars and arrays of class type with trivial copy-assignment 7949 // operators. 7950 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7951 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7952 // Compute the size of the memory buffer to be copied. 7953 QualType SizeType = Context.getSizeType(); 7954 llvm::APInt Size(Context.getTypeSize(SizeType), 7955 Context.getTypeSizeInChars(BaseType).getQuantity()); 7956 for (const ConstantArrayType *Array 7957 = Context.getAsConstantArrayType(FieldType); 7958 Array; 7959 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7960 llvm::APInt ArraySize 7961 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7962 Size *= ArraySize; 7963 } 7964 7965 // Take the address of the field references for "from" and "to". 7966 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7967 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7968 7969 bool NeedsCollectableMemCpy = 7970 (BaseType->isRecordType() && 7971 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7972 7973 if (NeedsCollectableMemCpy) { 7974 if (!CollectableMemCpyRef) { 7975 // Create a reference to the __builtin_objc_memmove_collectable function. 7976 LookupResult R(*this, 7977 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7978 Loc, LookupOrdinaryName); 7979 LookupName(R, TUScope, true); 7980 7981 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7982 if (!CollectableMemCpy) { 7983 // Something went horribly wrong earlier, and we will have 7984 // complained about it. 7985 Invalid = true; 7986 continue; 7987 } 7988 7989 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7990 Context.BuiltinFnTy, 7991 VK_RValue, Loc, 0).take(); 7992 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7993 } 7994 } 7995 // Create a reference to the __builtin_memcpy builtin function. 7996 else if (!BuiltinMemCpyRef) { 7997 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7998 LookupOrdinaryName); 7999 LookupName(R, TUScope, true); 8000 8001 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8002 if (!BuiltinMemCpy) { 8003 // Something went horribly wrong earlier, and we will have complained 8004 // about it. 8005 Invalid = true; 8006 continue; 8007 } 8008 8009 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8010 Context.BuiltinFnTy, 8011 VK_RValue, Loc, 0).take(); 8012 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8013 } 8014 8015 SmallVector<Expr*, 8> CallArgs; 8016 CallArgs.push_back(To.takeAs<Expr>()); 8017 CallArgs.push_back(From.takeAs<Expr>()); 8018 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8019 ExprResult Call = ExprError(); 8020 if (NeedsCollectableMemCpy) 8021 Call = ActOnCallExpr(/*Scope=*/0, 8022 CollectableMemCpyRef, 8023 Loc, CallArgs, 8024 Loc); 8025 else 8026 Call = ActOnCallExpr(/*Scope=*/0, 8027 BuiltinMemCpyRef, 8028 Loc, CallArgs, 8029 Loc); 8030 8031 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8032 Statements.push_back(Call.takeAs<Expr>()); 8033 continue; 8034 } 8035 8036 // Build the copy of this field. 8037 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 8038 To.get(), From.get(), 8039 /*CopyingBaseSubobject=*/false, 8040 /*Copying=*/true); 8041 if (Copy.isInvalid()) { 8042 Diag(CurrentLocation, diag::note_member_synthesized_at) 8043 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8044 CopyAssignOperator->setInvalidDecl(); 8045 return; 8046 } 8047 8048 // Success! Record the copy. 8049 Statements.push_back(Copy.takeAs<Stmt>()); 8050 } 8051 8052 if (!Invalid) { 8053 // Add a "return *this;" 8054 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8055 8056 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8057 if (Return.isInvalid()) 8058 Invalid = true; 8059 else { 8060 Statements.push_back(Return.takeAs<Stmt>()); 8061 8062 if (Trap.hasErrorOccurred()) { 8063 Diag(CurrentLocation, diag::note_member_synthesized_at) 8064 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8065 Invalid = true; 8066 } 8067 } 8068 } 8069 8070 if (Invalid) { 8071 CopyAssignOperator->setInvalidDecl(); 8072 return; 8073 } 8074 8075 StmtResult Body; 8076 { 8077 CompoundScopeRAII CompoundScope(*this); 8078 Body = ActOnCompoundStmt(Loc, Loc, Statements, 8079 /*isStmtExpr=*/false); 8080 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8081 } 8082 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 8083 8084 if (ASTMutationListener *L = getASTMutationListener()) { 8085 L->CompletedImplicitDefinition(CopyAssignOperator); 8086 } 8087} 8088 8089Sema::ImplicitExceptionSpecification 8090Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 8091 CXXRecordDecl *ClassDecl = MD->getParent(); 8092 8093 ImplicitExceptionSpecification ExceptSpec(*this); 8094 if (ClassDecl->isInvalidDecl()) 8095 return ExceptSpec; 8096 8097 // C++0x [except.spec]p14: 8098 // An implicitly declared special member function (Clause 12) shall have an 8099 // exception-specification. [...] 8100 8101 // It is unspecified whether or not an implicit move assignment operator 8102 // attempts to deduplicate calls to assignment operators of virtual bases are 8103 // made. As such, this exception specification is effectively unspecified. 8104 // Based on a similar decision made for constness in C++0x, we're erring on 8105 // the side of assuming such calls to be made regardless of whether they 8106 // actually happen. 8107 // Note that a move constructor is not implicitly declared when there are 8108 // virtual bases, but it can still be user-declared and explicitly defaulted. 8109 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8110 BaseEnd = ClassDecl->bases_end(); 8111 Base != BaseEnd; ++Base) { 8112 if (Base->isVirtual()) 8113 continue; 8114 8115 CXXRecordDecl *BaseClassDecl 8116 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8117 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8118 0, false, 0)) 8119 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8120 } 8121 8122 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8123 BaseEnd = ClassDecl->vbases_end(); 8124 Base != BaseEnd; ++Base) { 8125 CXXRecordDecl *BaseClassDecl 8126 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8127 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8128 0, false, 0)) 8129 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8130 } 8131 8132 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8133 FieldEnd = ClassDecl->field_end(); 8134 Field != FieldEnd; 8135 ++Field) { 8136 QualType FieldType = Context.getBaseElementType(Field->getType()); 8137 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8138 if (CXXMethodDecl *MoveAssign = 8139 LookupMovingAssignment(FieldClassDecl, 8140 FieldType.getCVRQualifiers(), 8141 false, 0)) 8142 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 8143 } 8144 } 8145 8146 return ExceptSpec; 8147} 8148 8149/// Determine whether the class type has any direct or indirect virtual base 8150/// classes which have a non-trivial move assignment operator. 8151static bool 8152hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 8153 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8154 BaseEnd = ClassDecl->vbases_end(); 8155 Base != BaseEnd; ++Base) { 8156 CXXRecordDecl *BaseClass = 8157 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8158 8159 // Try to declare the move assignment. If it would be deleted, then the 8160 // class does not have a non-trivial move assignment. 8161 if (BaseClass->needsImplicitMoveAssignment()) 8162 S.DeclareImplicitMoveAssignment(BaseClass); 8163 8164 // If the class has both a trivial move assignment and a non-trivial move 8165 // assignment, hasTrivialMoveAssignment() is false. 8166 if (BaseClass->hasDeclaredMoveAssignment() && 8167 !BaseClass->hasTrivialMoveAssignment()) 8168 return true; 8169 } 8170 8171 return false; 8172} 8173 8174/// Determine whether the given type either has a move constructor or is 8175/// trivially copyable. 8176static bool 8177hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8178 Type = S.Context.getBaseElementType(Type); 8179 8180 // FIXME: Technically, non-trivially-copyable non-class types, such as 8181 // reference types, are supposed to return false here, but that appears 8182 // to be a standard defect. 8183 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8184 if (!ClassDecl || !ClassDecl->getDefinition() || ClassDecl->isInvalidDecl()) 8185 return true; 8186 8187 if (Type.isTriviallyCopyableType(S.Context)) 8188 return true; 8189 8190 if (IsConstructor) { 8191 if (ClassDecl->needsImplicitMoveConstructor()) 8192 S.DeclareImplicitMoveConstructor(ClassDecl); 8193 return ClassDecl->hasDeclaredMoveConstructor(); 8194 } 8195 8196 if (ClassDecl->needsImplicitMoveAssignment()) 8197 S.DeclareImplicitMoveAssignment(ClassDecl); 8198 return ClassDecl->hasDeclaredMoveAssignment(); 8199} 8200 8201/// Determine whether all non-static data members and direct or virtual bases 8202/// of class \p ClassDecl have either a move operation, or are trivially 8203/// copyable. 8204static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8205 bool IsConstructor) { 8206 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8207 BaseEnd = ClassDecl->bases_end(); 8208 Base != BaseEnd; ++Base) { 8209 if (Base->isVirtual()) 8210 continue; 8211 8212 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8213 return false; 8214 } 8215 8216 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8217 BaseEnd = ClassDecl->vbases_end(); 8218 Base != BaseEnd; ++Base) { 8219 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8220 return false; 8221 } 8222 8223 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8224 FieldEnd = ClassDecl->field_end(); 8225 Field != FieldEnd; ++Field) { 8226 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 8227 return false; 8228 } 8229 8230 return true; 8231} 8232 8233CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8234 // C++11 [class.copy]p20: 8235 // If the definition of a class X does not explicitly declare a move 8236 // assignment operator, one will be implicitly declared as defaulted 8237 // if and only if: 8238 // 8239 // - [first 4 bullets] 8240 assert(ClassDecl->needsImplicitMoveAssignment()); 8241 8242 // [Checked after we build the declaration] 8243 // - the move assignment operator would not be implicitly defined as 8244 // deleted, 8245 8246 // [DR1402]: 8247 // - X has no direct or indirect virtual base class with a non-trivial 8248 // move assignment operator, and 8249 // - each of X's non-static data members and direct or virtual base classes 8250 // has a type that either has a move assignment operator or is trivially 8251 // copyable. 8252 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8253 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8254 ClassDecl->setFailedImplicitMoveAssignment(); 8255 return 0; 8256 } 8257 8258 // Note: The following rules are largely analoguous to the move 8259 // constructor rules. 8260 8261 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8262 QualType RetType = Context.getLValueReferenceType(ArgType); 8263 ArgType = Context.getRValueReferenceType(ArgType); 8264 8265 // An implicitly-declared move assignment operator is an inline public 8266 // member of its class. 8267 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8268 SourceLocation ClassLoc = ClassDecl->getLocation(); 8269 DeclarationNameInfo NameInfo(Name, ClassLoc); 8270 CXXMethodDecl *MoveAssignment 8271 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8272 /*TInfo=*/0, /*isStatic=*/false, 8273 /*StorageClassAsWritten=*/SC_None, 8274 /*isInline=*/true, 8275 /*isConstexpr=*/false, 8276 SourceLocation()); 8277 MoveAssignment->setAccess(AS_public); 8278 MoveAssignment->setDefaulted(); 8279 MoveAssignment->setImplicit(); 8280 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8281 8282 // Build an exception specification pointing back at this member. 8283 FunctionProtoType::ExtProtoInfo EPI; 8284 EPI.ExceptionSpecType = EST_Unevaluated; 8285 EPI.ExceptionSpecDecl = MoveAssignment; 8286 MoveAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 8287 8288 // Add the parameter to the operator. 8289 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8290 ClassLoc, ClassLoc, /*Id=*/0, 8291 ArgType, /*TInfo=*/0, 8292 SC_None, 8293 SC_None, 0); 8294 MoveAssignment->setParams(FromParam); 8295 8296 // Note that we have added this copy-assignment operator. 8297 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8298 8299 // C++0x [class.copy]p9: 8300 // If the definition of a class X does not explicitly declare a move 8301 // assignment operator, one will be implicitly declared as defaulted if and 8302 // only if: 8303 // [...] 8304 // - the move assignment operator would not be implicitly defined as 8305 // deleted. 8306 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8307 // Cache this result so that we don't try to generate this over and over 8308 // on every lookup, leaking memory and wasting time. 8309 ClassDecl->setFailedImplicitMoveAssignment(); 8310 return 0; 8311 } 8312 8313 if (Scope *S = getScopeForContext(ClassDecl)) 8314 PushOnScopeChains(MoveAssignment, S, false); 8315 ClassDecl->addDecl(MoveAssignment); 8316 8317 AddOverriddenMethods(ClassDecl, MoveAssignment); 8318 return MoveAssignment; 8319} 8320 8321void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8322 CXXMethodDecl *MoveAssignOperator) { 8323 assert((MoveAssignOperator->isDefaulted() && 8324 MoveAssignOperator->isOverloadedOperator() && 8325 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8326 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8327 !MoveAssignOperator->isDeleted()) && 8328 "DefineImplicitMoveAssignment called for wrong function"); 8329 8330 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8331 8332 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8333 MoveAssignOperator->setInvalidDecl(); 8334 return; 8335 } 8336 8337 MoveAssignOperator->setUsed(); 8338 8339 SynthesizedFunctionScope Scope(*this, MoveAssignOperator); 8340 DiagnosticErrorTrap Trap(Diags); 8341 8342 // C++0x [class.copy]p28: 8343 // The implicitly-defined or move assignment operator for a non-union class 8344 // X performs memberwise move assignment of its subobjects. The direct base 8345 // classes of X are assigned first, in the order of their declaration in the 8346 // base-specifier-list, and then the immediate non-static data members of X 8347 // are assigned, in the order in which they were declared in the class 8348 // definition. 8349 8350 // The statements that form the synthesized function body. 8351 SmallVector<Stmt*, 8> Statements; 8352 8353 // The parameter for the "other" object, which we are move from. 8354 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8355 QualType OtherRefType = Other->getType()-> 8356 getAs<RValueReferenceType>()->getPointeeType(); 8357 assert(OtherRefType.getQualifiers() == 0 && 8358 "Bad argument type of defaulted move assignment"); 8359 8360 // Our location for everything implicitly-generated. 8361 SourceLocation Loc = MoveAssignOperator->getLocation(); 8362 8363 // Construct a reference to the "other" object. We'll be using this 8364 // throughout the generated ASTs. 8365 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8366 assert(OtherRef && "Reference to parameter cannot fail!"); 8367 // Cast to rvalue. 8368 OtherRef = CastForMoving(*this, OtherRef); 8369 8370 // Construct the "this" pointer. We'll be using this throughout the generated 8371 // ASTs. 8372 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8373 assert(This && "Reference to this cannot fail!"); 8374 8375 // Assign base classes. 8376 bool Invalid = false; 8377 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8378 E = ClassDecl->bases_end(); Base != E; ++Base) { 8379 // Form the assignment: 8380 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8381 QualType BaseType = Base->getType().getUnqualifiedType(); 8382 if (!BaseType->isRecordType()) { 8383 Invalid = true; 8384 continue; 8385 } 8386 8387 CXXCastPath BasePath; 8388 BasePath.push_back(Base); 8389 8390 // Construct the "from" expression, which is an implicit cast to the 8391 // appropriately-qualified base type. 8392 Expr *From = OtherRef; 8393 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8394 VK_XValue, &BasePath).take(); 8395 8396 // Dereference "this". 8397 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8398 8399 // Implicitly cast "this" to the appropriately-qualified base type. 8400 To = ImpCastExprToType(To.take(), 8401 Context.getCVRQualifiedType(BaseType, 8402 MoveAssignOperator->getTypeQualifiers()), 8403 CK_UncheckedDerivedToBase, 8404 VK_LValue, &BasePath); 8405 8406 // Build the move. 8407 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8408 To.get(), From, 8409 /*CopyingBaseSubobject=*/true, 8410 /*Copying=*/false); 8411 if (Move.isInvalid()) { 8412 Diag(CurrentLocation, diag::note_member_synthesized_at) 8413 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8414 MoveAssignOperator->setInvalidDecl(); 8415 return; 8416 } 8417 8418 // Success! Record the move. 8419 Statements.push_back(Move.takeAs<Expr>()); 8420 } 8421 8422 // \brief Reference to the __builtin_memcpy function. 8423 Expr *BuiltinMemCpyRef = 0; 8424 // \brief Reference to the __builtin_objc_memmove_collectable function. 8425 Expr *CollectableMemCpyRef = 0; 8426 8427 // Assign non-static members. 8428 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8429 FieldEnd = ClassDecl->field_end(); 8430 Field != FieldEnd; ++Field) { 8431 if (Field->isUnnamedBitfield()) 8432 continue; 8433 8434 // Check for members of reference type; we can't move those. 8435 if (Field->getType()->isReferenceType()) { 8436 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8437 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8438 Diag(Field->getLocation(), diag::note_declared_at); 8439 Diag(CurrentLocation, diag::note_member_synthesized_at) 8440 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8441 Invalid = true; 8442 continue; 8443 } 8444 8445 // Check for members of const-qualified, non-class type. 8446 QualType BaseType = Context.getBaseElementType(Field->getType()); 8447 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8448 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8449 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8450 Diag(Field->getLocation(), diag::note_declared_at); 8451 Diag(CurrentLocation, diag::note_member_synthesized_at) 8452 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8453 Invalid = true; 8454 continue; 8455 } 8456 8457 // Suppress assigning zero-width bitfields. 8458 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8459 continue; 8460 8461 QualType FieldType = Field->getType().getNonReferenceType(); 8462 if (FieldType->isIncompleteArrayType()) { 8463 assert(ClassDecl->hasFlexibleArrayMember() && 8464 "Incomplete array type is not valid"); 8465 continue; 8466 } 8467 8468 // Build references to the field in the object we're copying from and to. 8469 CXXScopeSpec SS; // Intentionally empty 8470 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8471 LookupMemberName); 8472 MemberLookup.addDecl(*Field); 8473 MemberLookup.resolveKind(); 8474 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8475 Loc, /*IsArrow=*/false, 8476 SS, SourceLocation(), 0, 8477 MemberLookup, 0); 8478 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8479 Loc, /*IsArrow=*/true, 8480 SS, SourceLocation(), 0, 8481 MemberLookup, 0); 8482 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8483 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8484 8485 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8486 "Member reference with rvalue base must be rvalue except for reference " 8487 "members, which aren't allowed for move assignment."); 8488 8489 // If the field should be copied with __builtin_memcpy rather than via 8490 // explicit assignments, do so. This optimization only applies for arrays 8491 // of scalars and arrays of class type with trivial move-assignment 8492 // operators. 8493 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8494 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8495 // Compute the size of the memory buffer to be copied. 8496 QualType SizeType = Context.getSizeType(); 8497 llvm::APInt Size(Context.getTypeSize(SizeType), 8498 Context.getTypeSizeInChars(BaseType).getQuantity()); 8499 for (const ConstantArrayType *Array 8500 = Context.getAsConstantArrayType(FieldType); 8501 Array; 8502 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8503 llvm::APInt ArraySize 8504 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8505 Size *= ArraySize; 8506 } 8507 8508 // Take the address of the field references for "from" and "to". We 8509 // directly construct UnaryOperators here because semantic analysis 8510 // does not permit us to take the address of an xvalue. 8511 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8512 Context.getPointerType(From.get()->getType()), 8513 VK_RValue, OK_Ordinary, Loc); 8514 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8515 Context.getPointerType(To.get()->getType()), 8516 VK_RValue, OK_Ordinary, Loc); 8517 8518 bool NeedsCollectableMemCpy = 8519 (BaseType->isRecordType() && 8520 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8521 8522 if (NeedsCollectableMemCpy) { 8523 if (!CollectableMemCpyRef) { 8524 // Create a reference to the __builtin_objc_memmove_collectable function. 8525 LookupResult R(*this, 8526 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8527 Loc, LookupOrdinaryName); 8528 LookupName(R, TUScope, true); 8529 8530 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8531 if (!CollectableMemCpy) { 8532 // Something went horribly wrong earlier, and we will have 8533 // complained about it. 8534 Invalid = true; 8535 continue; 8536 } 8537 8538 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8539 Context.BuiltinFnTy, 8540 VK_RValue, Loc, 0).take(); 8541 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8542 } 8543 } 8544 // Create a reference to the __builtin_memcpy builtin function. 8545 else if (!BuiltinMemCpyRef) { 8546 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8547 LookupOrdinaryName); 8548 LookupName(R, TUScope, true); 8549 8550 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8551 if (!BuiltinMemCpy) { 8552 // Something went horribly wrong earlier, and we will have complained 8553 // about it. 8554 Invalid = true; 8555 continue; 8556 } 8557 8558 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8559 Context.BuiltinFnTy, 8560 VK_RValue, Loc, 0).take(); 8561 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8562 } 8563 8564 SmallVector<Expr*, 8> CallArgs; 8565 CallArgs.push_back(To.takeAs<Expr>()); 8566 CallArgs.push_back(From.takeAs<Expr>()); 8567 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8568 ExprResult Call = ExprError(); 8569 if (NeedsCollectableMemCpy) 8570 Call = ActOnCallExpr(/*Scope=*/0, 8571 CollectableMemCpyRef, 8572 Loc, CallArgs, 8573 Loc); 8574 else 8575 Call = ActOnCallExpr(/*Scope=*/0, 8576 BuiltinMemCpyRef, 8577 Loc, CallArgs, 8578 Loc); 8579 8580 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8581 Statements.push_back(Call.takeAs<Expr>()); 8582 continue; 8583 } 8584 8585 // Build the move of this field. 8586 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8587 To.get(), From.get(), 8588 /*CopyingBaseSubobject=*/false, 8589 /*Copying=*/false); 8590 if (Move.isInvalid()) { 8591 Diag(CurrentLocation, diag::note_member_synthesized_at) 8592 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8593 MoveAssignOperator->setInvalidDecl(); 8594 return; 8595 } 8596 8597 // Success! Record the copy. 8598 Statements.push_back(Move.takeAs<Stmt>()); 8599 } 8600 8601 if (!Invalid) { 8602 // Add a "return *this;" 8603 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8604 8605 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8606 if (Return.isInvalid()) 8607 Invalid = true; 8608 else { 8609 Statements.push_back(Return.takeAs<Stmt>()); 8610 8611 if (Trap.hasErrorOccurred()) { 8612 Diag(CurrentLocation, diag::note_member_synthesized_at) 8613 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8614 Invalid = true; 8615 } 8616 } 8617 } 8618 8619 if (Invalid) { 8620 MoveAssignOperator->setInvalidDecl(); 8621 return; 8622 } 8623 8624 StmtResult Body; 8625 { 8626 CompoundScopeRAII CompoundScope(*this); 8627 Body = ActOnCompoundStmt(Loc, Loc, Statements, 8628 /*isStmtExpr=*/false); 8629 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8630 } 8631 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8632 8633 if (ASTMutationListener *L = getASTMutationListener()) { 8634 L->CompletedImplicitDefinition(MoveAssignOperator); 8635 } 8636} 8637 8638/// Determine whether an implicit copy constructor for ClassDecl has a const 8639/// argument. 8640/// FIXME: It ought to be possible to store this on the record. 8641static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl) { 8642 if (ClassDecl->isInvalidDecl()) 8643 return true; 8644 8645 // C++ [class.copy]p5: 8646 // The implicitly-declared copy constructor for a class X will 8647 // have the form 8648 // 8649 // X::X(const X&) 8650 // 8651 // if 8652 // -- each direct or virtual base class B of X has a copy 8653 // constructor whose first parameter is of type const B& or 8654 // const volatile B&, and 8655 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8656 BaseEnd = ClassDecl->bases_end(); 8657 Base != BaseEnd; ++Base) { 8658 // Virtual bases are handled below. 8659 if (Base->isVirtual()) 8660 continue; 8661 8662 CXXRecordDecl *BaseClassDecl 8663 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8664 // FIXME: This lookup is wrong. If the copy ctor for a member or base is 8665 // ambiguous, we should still produce a constructor with a const-qualified 8666 // parameter. 8667 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const)) 8668 return false; 8669 } 8670 8671 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8672 BaseEnd = ClassDecl->vbases_end(); 8673 Base != BaseEnd; ++Base) { 8674 CXXRecordDecl *BaseClassDecl 8675 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8676 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const)) 8677 return false; 8678 } 8679 8680 // -- for all the nonstatic data members of X that are of a 8681 // class type M (or array thereof), each such class type 8682 // has a copy constructor whose first parameter is of type 8683 // const M& or const volatile M&. 8684 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8685 FieldEnd = ClassDecl->field_end(); 8686 Field != FieldEnd; ++Field) { 8687 QualType FieldType = S.Context.getBaseElementType(Field->getType()); 8688 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8689 if (!S.LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const)) 8690 return false; 8691 } 8692 } 8693 8694 // Otherwise, the implicitly declared copy constructor will have 8695 // the form 8696 // 8697 // X::X(X&) 8698 8699 return true; 8700} 8701 8702Sema::ImplicitExceptionSpecification 8703Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 8704 CXXRecordDecl *ClassDecl = MD->getParent(); 8705 8706 ImplicitExceptionSpecification ExceptSpec(*this); 8707 if (ClassDecl->isInvalidDecl()) 8708 return ExceptSpec; 8709 8710 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 8711 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 8712 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 8713 8714 // C++ [except.spec]p14: 8715 // An implicitly declared special member function (Clause 12) shall have an 8716 // exception-specification. [...] 8717 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8718 BaseEnd = ClassDecl->bases_end(); 8719 Base != BaseEnd; 8720 ++Base) { 8721 // Virtual bases are handled below. 8722 if (Base->isVirtual()) 8723 continue; 8724 8725 CXXRecordDecl *BaseClassDecl 8726 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8727 if (CXXConstructorDecl *CopyConstructor = 8728 LookupCopyingConstructor(BaseClassDecl, Quals)) 8729 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8730 } 8731 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8732 BaseEnd = ClassDecl->vbases_end(); 8733 Base != BaseEnd; 8734 ++Base) { 8735 CXXRecordDecl *BaseClassDecl 8736 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8737 if (CXXConstructorDecl *CopyConstructor = 8738 LookupCopyingConstructor(BaseClassDecl, Quals)) 8739 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8740 } 8741 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8742 FieldEnd = ClassDecl->field_end(); 8743 Field != FieldEnd; 8744 ++Field) { 8745 QualType FieldType = Context.getBaseElementType(Field->getType()); 8746 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8747 if (CXXConstructorDecl *CopyConstructor = 8748 LookupCopyingConstructor(FieldClassDecl, 8749 Quals | FieldType.getCVRQualifiers())) 8750 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 8751 } 8752 } 8753 8754 return ExceptSpec; 8755} 8756 8757CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8758 CXXRecordDecl *ClassDecl) { 8759 // C++ [class.copy]p4: 8760 // If the class definition does not explicitly declare a copy 8761 // constructor, one is declared implicitly. 8762 8763 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8764 QualType ArgType = ClassType; 8765 bool Const = isImplicitCopyCtorArgConst(*this, ClassDecl); 8766 if (Const) 8767 ArgType = ArgType.withConst(); 8768 ArgType = Context.getLValueReferenceType(ArgType); 8769 8770 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8771 CXXCopyConstructor, 8772 Const); 8773 8774 DeclarationName Name 8775 = Context.DeclarationNames.getCXXConstructorName( 8776 Context.getCanonicalType(ClassType)); 8777 SourceLocation ClassLoc = ClassDecl->getLocation(); 8778 DeclarationNameInfo NameInfo(Name, ClassLoc); 8779 8780 // An implicitly-declared copy constructor is an inline public 8781 // member of its class. 8782 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8783 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 8784 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8785 Constexpr); 8786 CopyConstructor->setAccess(AS_public); 8787 CopyConstructor->setDefaulted(); 8788 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8789 8790 // Build an exception specification pointing back at this member. 8791 FunctionProtoType::ExtProtoInfo EPI; 8792 EPI.ExceptionSpecType = EST_Unevaluated; 8793 EPI.ExceptionSpecDecl = CopyConstructor; 8794 CopyConstructor->setType( 8795 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 8796 8797 // Note that we have declared this constructor. 8798 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8799 8800 // Add the parameter to the constructor. 8801 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8802 ClassLoc, ClassLoc, 8803 /*IdentifierInfo=*/0, 8804 ArgType, /*TInfo=*/0, 8805 SC_None, 8806 SC_None, 0); 8807 CopyConstructor->setParams(FromParam); 8808 8809 if (Scope *S = getScopeForContext(ClassDecl)) 8810 PushOnScopeChains(CopyConstructor, S, false); 8811 ClassDecl->addDecl(CopyConstructor); 8812 8813 // C++11 [class.copy]p8: 8814 // ... If the class definition does not explicitly declare a copy 8815 // constructor, there is no user-declared move constructor, and there is no 8816 // user-declared move assignment operator, a copy constructor is implicitly 8817 // declared as defaulted. 8818 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8819 CopyConstructor->setDeletedAsWritten(); 8820 8821 return CopyConstructor; 8822} 8823 8824void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8825 CXXConstructorDecl *CopyConstructor) { 8826 assert((CopyConstructor->isDefaulted() && 8827 CopyConstructor->isCopyConstructor() && 8828 !CopyConstructor->doesThisDeclarationHaveABody() && 8829 !CopyConstructor->isDeleted()) && 8830 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8831 8832 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8833 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8834 8835 SynthesizedFunctionScope Scope(*this, CopyConstructor); 8836 DiagnosticErrorTrap Trap(Diags); 8837 8838 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8839 Trap.hasErrorOccurred()) { 8840 Diag(CurrentLocation, diag::note_member_synthesized_at) 8841 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8842 CopyConstructor->setInvalidDecl(); 8843 } else { 8844 Sema::CompoundScopeRAII CompoundScope(*this); 8845 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8846 CopyConstructor->getLocation(), 8847 MultiStmtArg(), 8848 /*isStmtExpr=*/false) 8849 .takeAs<Stmt>()); 8850 CopyConstructor->setImplicitlyDefined(true); 8851 } 8852 8853 CopyConstructor->setUsed(); 8854 if (ASTMutationListener *L = getASTMutationListener()) { 8855 L->CompletedImplicitDefinition(CopyConstructor); 8856 } 8857} 8858 8859Sema::ImplicitExceptionSpecification 8860Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 8861 CXXRecordDecl *ClassDecl = MD->getParent(); 8862 8863 // C++ [except.spec]p14: 8864 // An implicitly declared special member function (Clause 12) shall have an 8865 // exception-specification. [...] 8866 ImplicitExceptionSpecification ExceptSpec(*this); 8867 if (ClassDecl->isInvalidDecl()) 8868 return ExceptSpec; 8869 8870 // Direct base-class constructors. 8871 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8872 BEnd = ClassDecl->bases_end(); 8873 B != BEnd; ++B) { 8874 if (B->isVirtual()) // Handled below. 8875 continue; 8876 8877 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8878 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8879 CXXConstructorDecl *Constructor = 8880 LookupMovingConstructor(BaseClassDecl, 0); 8881 // If this is a deleted function, add it anyway. This might be conformant 8882 // with the standard. This might not. I'm not sure. It might not matter. 8883 if (Constructor) 8884 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8885 } 8886 } 8887 8888 // Virtual base-class constructors. 8889 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8890 BEnd = ClassDecl->vbases_end(); 8891 B != BEnd; ++B) { 8892 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8893 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8894 CXXConstructorDecl *Constructor = 8895 LookupMovingConstructor(BaseClassDecl, 0); 8896 // If this is a deleted function, add it anyway. This might be conformant 8897 // with the standard. This might not. I'm not sure. It might not matter. 8898 if (Constructor) 8899 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8900 } 8901 } 8902 8903 // Field constructors. 8904 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8905 FEnd = ClassDecl->field_end(); 8906 F != FEnd; ++F) { 8907 QualType FieldType = Context.getBaseElementType(F->getType()); 8908 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 8909 CXXConstructorDecl *Constructor = 8910 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 8911 // If this is a deleted function, add it anyway. This might be conformant 8912 // with the standard. This might not. I'm not sure. It might not matter. 8913 // In particular, the problem is that this function never gets called. It 8914 // might just be ill-formed because this function attempts to refer to 8915 // a deleted function here. 8916 if (Constructor) 8917 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 8918 } 8919 } 8920 8921 return ExceptSpec; 8922} 8923 8924CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8925 CXXRecordDecl *ClassDecl) { 8926 // C++11 [class.copy]p9: 8927 // If the definition of a class X does not explicitly declare a move 8928 // constructor, one will be implicitly declared as defaulted if and only if: 8929 // 8930 // - [first 4 bullets] 8931 assert(ClassDecl->needsImplicitMoveConstructor()); 8932 8933 // [Checked after we build the declaration] 8934 // - the move assignment operator would not be implicitly defined as 8935 // deleted, 8936 8937 // [DR1402]: 8938 // - each of X's non-static data members and direct or virtual base classes 8939 // has a type that either has a move constructor or is trivially copyable. 8940 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 8941 ClassDecl->setFailedImplicitMoveConstructor(); 8942 return 0; 8943 } 8944 8945 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8946 QualType ArgType = Context.getRValueReferenceType(ClassType); 8947 8948 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8949 CXXMoveConstructor, 8950 false); 8951 8952 DeclarationName Name 8953 = Context.DeclarationNames.getCXXConstructorName( 8954 Context.getCanonicalType(ClassType)); 8955 SourceLocation ClassLoc = ClassDecl->getLocation(); 8956 DeclarationNameInfo NameInfo(Name, ClassLoc); 8957 8958 // C++0x [class.copy]p11: 8959 // An implicitly-declared copy/move constructor is an inline public 8960 // member of its class. 8961 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8962 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 8963 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8964 Constexpr); 8965 MoveConstructor->setAccess(AS_public); 8966 MoveConstructor->setDefaulted(); 8967 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8968 8969 // Build an exception specification pointing back at this member. 8970 FunctionProtoType::ExtProtoInfo EPI; 8971 EPI.ExceptionSpecType = EST_Unevaluated; 8972 EPI.ExceptionSpecDecl = MoveConstructor; 8973 MoveConstructor->setType( 8974 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 8975 8976 // Add the parameter to the constructor. 8977 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8978 ClassLoc, ClassLoc, 8979 /*IdentifierInfo=*/0, 8980 ArgType, /*TInfo=*/0, 8981 SC_None, 8982 SC_None, 0); 8983 MoveConstructor->setParams(FromParam); 8984 8985 // C++0x [class.copy]p9: 8986 // If the definition of a class X does not explicitly declare a move 8987 // constructor, one will be implicitly declared as defaulted if and only if: 8988 // [...] 8989 // - the move constructor would not be implicitly defined as deleted. 8990 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8991 // Cache this result so that we don't try to generate this over and over 8992 // on every lookup, leaking memory and wasting time. 8993 ClassDecl->setFailedImplicitMoveConstructor(); 8994 return 0; 8995 } 8996 8997 // Note that we have declared this constructor. 8998 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8999 9000 if (Scope *S = getScopeForContext(ClassDecl)) 9001 PushOnScopeChains(MoveConstructor, S, false); 9002 ClassDecl->addDecl(MoveConstructor); 9003 9004 return MoveConstructor; 9005} 9006 9007void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 9008 CXXConstructorDecl *MoveConstructor) { 9009 assert((MoveConstructor->isDefaulted() && 9010 MoveConstructor->isMoveConstructor() && 9011 !MoveConstructor->doesThisDeclarationHaveABody() && 9012 !MoveConstructor->isDeleted()) && 9013 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 9014 9015 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 9016 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 9017 9018 SynthesizedFunctionScope Scope(*this, MoveConstructor); 9019 DiagnosticErrorTrap Trap(Diags); 9020 9021 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 9022 Trap.hasErrorOccurred()) { 9023 Diag(CurrentLocation, diag::note_member_synthesized_at) 9024 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 9025 MoveConstructor->setInvalidDecl(); 9026 } else { 9027 Sema::CompoundScopeRAII CompoundScope(*this); 9028 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 9029 MoveConstructor->getLocation(), 9030 MultiStmtArg(), 9031 /*isStmtExpr=*/false) 9032 .takeAs<Stmt>()); 9033 MoveConstructor->setImplicitlyDefined(true); 9034 } 9035 9036 MoveConstructor->setUsed(); 9037 9038 if (ASTMutationListener *L = getASTMutationListener()) { 9039 L->CompletedImplicitDefinition(MoveConstructor); 9040 } 9041} 9042 9043bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 9044 return FD->isDeleted() && 9045 (FD->isDefaulted() || FD->isImplicit()) && 9046 isa<CXXMethodDecl>(FD); 9047} 9048 9049/// \brief Mark the call operator of the given lambda closure type as "used". 9050static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 9051 CXXMethodDecl *CallOperator 9052 = cast<CXXMethodDecl>( 9053 *Lambda->lookup( 9054 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 9055 CallOperator->setReferenced(); 9056 CallOperator->setUsed(); 9057} 9058 9059void Sema::DefineImplicitLambdaToFunctionPointerConversion( 9060 SourceLocation CurrentLocation, 9061 CXXConversionDecl *Conv) 9062{ 9063 CXXRecordDecl *Lambda = Conv->getParent(); 9064 9065 // Make sure that the lambda call operator is marked used. 9066 markLambdaCallOperatorUsed(*this, Lambda); 9067 9068 Conv->setUsed(); 9069 9070 SynthesizedFunctionScope Scope(*this, Conv); 9071 DiagnosticErrorTrap Trap(Diags); 9072 9073 // Return the address of the __invoke function. 9074 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 9075 CXXMethodDecl *Invoke 9076 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 9077 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 9078 VK_LValue, Conv->getLocation()).take(); 9079 assert(FunctionRef && "Can't refer to __invoke function?"); 9080 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 9081 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 9082 Conv->getLocation(), 9083 Conv->getLocation())); 9084 9085 // Fill in the __invoke function with a dummy implementation. IR generation 9086 // will fill in the actual details. 9087 Invoke->setUsed(); 9088 Invoke->setReferenced(); 9089 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation())); 9090 9091 if (ASTMutationListener *L = getASTMutationListener()) { 9092 L->CompletedImplicitDefinition(Conv); 9093 L->CompletedImplicitDefinition(Invoke); 9094 } 9095} 9096 9097void Sema::DefineImplicitLambdaToBlockPointerConversion( 9098 SourceLocation CurrentLocation, 9099 CXXConversionDecl *Conv) 9100{ 9101 Conv->setUsed(); 9102 9103 SynthesizedFunctionScope Scope(*this, Conv); 9104 DiagnosticErrorTrap Trap(Diags); 9105 9106 // Copy-initialize the lambda object as needed to capture it. 9107 Expr *This = ActOnCXXThis(CurrentLocation).take(); 9108 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 9109 9110 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 9111 Conv->getLocation(), 9112 Conv, DerefThis); 9113 9114 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 9115 // behavior. Note that only the general conversion function does this 9116 // (since it's unusable otherwise); in the case where we inline the 9117 // block literal, it has block literal lifetime semantics. 9118 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 9119 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 9120 CK_CopyAndAutoreleaseBlockObject, 9121 BuildBlock.get(), 0, VK_RValue); 9122 9123 if (BuildBlock.isInvalid()) { 9124 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9125 Conv->setInvalidDecl(); 9126 return; 9127 } 9128 9129 // Create the return statement that returns the block from the conversion 9130 // function. 9131 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 9132 if (Return.isInvalid()) { 9133 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9134 Conv->setInvalidDecl(); 9135 return; 9136 } 9137 9138 // Set the body of the conversion function. 9139 Stmt *ReturnS = Return.take(); 9140 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 9141 Conv->getLocation(), 9142 Conv->getLocation())); 9143 9144 // We're done; notify the mutation listener, if any. 9145 if (ASTMutationListener *L = getASTMutationListener()) { 9146 L->CompletedImplicitDefinition(Conv); 9147 } 9148} 9149 9150/// \brief Determine whether the given list arguments contains exactly one 9151/// "real" (non-default) argument. 9152static bool hasOneRealArgument(MultiExprArg Args) { 9153 switch (Args.size()) { 9154 case 0: 9155 return false; 9156 9157 default: 9158 if (!Args[1]->isDefaultArgument()) 9159 return false; 9160 9161 // fall through 9162 case 1: 9163 return !Args[0]->isDefaultArgument(); 9164 } 9165 9166 return false; 9167} 9168 9169ExprResult 9170Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9171 CXXConstructorDecl *Constructor, 9172 MultiExprArg ExprArgs, 9173 bool HadMultipleCandidates, 9174 bool RequiresZeroInit, 9175 unsigned ConstructKind, 9176 SourceRange ParenRange) { 9177 bool Elidable = false; 9178 9179 // C++0x [class.copy]p34: 9180 // When certain criteria are met, an implementation is allowed to 9181 // omit the copy/move construction of a class object, even if the 9182 // copy/move constructor and/or destructor for the object have 9183 // side effects. [...] 9184 // - when a temporary class object that has not been bound to a 9185 // reference (12.2) would be copied/moved to a class object 9186 // with the same cv-unqualified type, the copy/move operation 9187 // can be omitted by constructing the temporary object 9188 // directly into the target of the omitted copy/move 9189 if (ConstructKind == CXXConstructExpr::CK_Complete && 9190 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9191 Expr *SubExpr = ExprArgs[0]; 9192 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9193 } 9194 9195 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9196 Elidable, ExprArgs, HadMultipleCandidates, 9197 RequiresZeroInit, ConstructKind, ParenRange); 9198} 9199 9200/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9201/// including handling of its default argument expressions. 9202ExprResult 9203Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9204 CXXConstructorDecl *Constructor, bool Elidable, 9205 MultiExprArg ExprArgs, 9206 bool HadMultipleCandidates, 9207 bool RequiresZeroInit, 9208 unsigned ConstructKind, 9209 SourceRange ParenRange) { 9210 MarkFunctionReferenced(ConstructLoc, Constructor); 9211 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9212 Constructor, Elidable, ExprArgs, 9213 HadMultipleCandidates, /*FIXME*/false, 9214 RequiresZeroInit, 9215 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9216 ParenRange)); 9217} 9218 9219bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9220 CXXConstructorDecl *Constructor, 9221 MultiExprArg Exprs, 9222 bool HadMultipleCandidates) { 9223 // FIXME: Provide the correct paren SourceRange when available. 9224 ExprResult TempResult = 9225 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9226 Exprs, HadMultipleCandidates, false, 9227 CXXConstructExpr::CK_Complete, SourceRange()); 9228 if (TempResult.isInvalid()) 9229 return true; 9230 9231 Expr *Temp = TempResult.takeAs<Expr>(); 9232 CheckImplicitConversions(Temp, VD->getLocation()); 9233 MarkFunctionReferenced(VD->getLocation(), Constructor); 9234 Temp = MaybeCreateExprWithCleanups(Temp); 9235 VD->setInit(Temp); 9236 9237 return false; 9238} 9239 9240void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9241 if (VD->isInvalidDecl()) return; 9242 9243 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9244 if (ClassDecl->isInvalidDecl()) return; 9245 if (ClassDecl->hasIrrelevantDestructor()) return; 9246 if (ClassDecl->isDependentContext()) return; 9247 9248 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9249 MarkFunctionReferenced(VD->getLocation(), Destructor); 9250 CheckDestructorAccess(VD->getLocation(), Destructor, 9251 PDiag(diag::err_access_dtor_var) 9252 << VD->getDeclName() 9253 << VD->getType()); 9254 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9255 9256 if (!VD->hasGlobalStorage()) return; 9257 9258 // Emit warning for non-trivial dtor in global scope (a real global, 9259 // class-static, function-static). 9260 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9261 9262 // TODO: this should be re-enabled for static locals by !CXAAtExit 9263 if (!VD->isStaticLocal()) 9264 Diag(VD->getLocation(), diag::warn_global_destructor); 9265} 9266 9267/// \brief Given a constructor and the set of arguments provided for the 9268/// constructor, convert the arguments and add any required default arguments 9269/// to form a proper call to this constructor. 9270/// 9271/// \returns true if an error occurred, false otherwise. 9272bool 9273Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9274 MultiExprArg ArgsPtr, 9275 SourceLocation Loc, 9276 SmallVectorImpl<Expr*> &ConvertedArgs, 9277 bool AllowExplicit) { 9278 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9279 unsigned NumArgs = ArgsPtr.size(); 9280 Expr **Args = ArgsPtr.data(); 9281 9282 const FunctionProtoType *Proto 9283 = Constructor->getType()->getAs<FunctionProtoType>(); 9284 assert(Proto && "Constructor without a prototype?"); 9285 unsigned NumArgsInProto = Proto->getNumArgs(); 9286 9287 // If too few arguments are available, we'll fill in the rest with defaults. 9288 if (NumArgs < NumArgsInProto) 9289 ConvertedArgs.reserve(NumArgsInProto); 9290 else 9291 ConvertedArgs.reserve(NumArgs); 9292 9293 VariadicCallType CallType = 9294 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9295 SmallVector<Expr *, 8> AllArgs; 9296 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9297 Proto, 0, Args, NumArgs, AllArgs, 9298 CallType, AllowExplicit); 9299 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9300 9301 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9302 9303 CheckConstructorCall(Constructor, AllArgs.data(), AllArgs.size(), 9304 Proto, Loc); 9305 9306 return Invalid; 9307} 9308 9309static inline bool 9310CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9311 const FunctionDecl *FnDecl) { 9312 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9313 if (isa<NamespaceDecl>(DC)) { 9314 return SemaRef.Diag(FnDecl->getLocation(), 9315 diag::err_operator_new_delete_declared_in_namespace) 9316 << FnDecl->getDeclName(); 9317 } 9318 9319 if (isa<TranslationUnitDecl>(DC) && 9320 FnDecl->getStorageClass() == SC_Static) { 9321 return SemaRef.Diag(FnDecl->getLocation(), 9322 diag::err_operator_new_delete_declared_static) 9323 << FnDecl->getDeclName(); 9324 } 9325 9326 return false; 9327} 9328 9329static inline bool 9330CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9331 CanQualType ExpectedResultType, 9332 CanQualType ExpectedFirstParamType, 9333 unsigned DependentParamTypeDiag, 9334 unsigned InvalidParamTypeDiag) { 9335 QualType ResultType = 9336 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9337 9338 // Check that the result type is not dependent. 9339 if (ResultType->isDependentType()) 9340 return SemaRef.Diag(FnDecl->getLocation(), 9341 diag::err_operator_new_delete_dependent_result_type) 9342 << FnDecl->getDeclName() << ExpectedResultType; 9343 9344 // Check that the result type is what we expect. 9345 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9346 return SemaRef.Diag(FnDecl->getLocation(), 9347 diag::err_operator_new_delete_invalid_result_type) 9348 << FnDecl->getDeclName() << ExpectedResultType; 9349 9350 // A function template must have at least 2 parameters. 9351 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9352 return SemaRef.Diag(FnDecl->getLocation(), 9353 diag::err_operator_new_delete_template_too_few_parameters) 9354 << FnDecl->getDeclName(); 9355 9356 // The function decl must have at least 1 parameter. 9357 if (FnDecl->getNumParams() == 0) 9358 return SemaRef.Diag(FnDecl->getLocation(), 9359 diag::err_operator_new_delete_too_few_parameters) 9360 << FnDecl->getDeclName(); 9361 9362 // Check the first parameter type is not dependent. 9363 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9364 if (FirstParamType->isDependentType()) 9365 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9366 << FnDecl->getDeclName() << ExpectedFirstParamType; 9367 9368 // Check that the first parameter type is what we expect. 9369 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9370 ExpectedFirstParamType) 9371 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9372 << FnDecl->getDeclName() << ExpectedFirstParamType; 9373 9374 return false; 9375} 9376 9377static bool 9378CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9379 // C++ [basic.stc.dynamic.allocation]p1: 9380 // A program is ill-formed if an allocation function is declared in a 9381 // namespace scope other than global scope or declared static in global 9382 // scope. 9383 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9384 return true; 9385 9386 CanQualType SizeTy = 9387 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9388 9389 // C++ [basic.stc.dynamic.allocation]p1: 9390 // The return type shall be void*. The first parameter shall have type 9391 // std::size_t. 9392 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9393 SizeTy, 9394 diag::err_operator_new_dependent_param_type, 9395 diag::err_operator_new_param_type)) 9396 return true; 9397 9398 // C++ [basic.stc.dynamic.allocation]p1: 9399 // The first parameter shall not have an associated default argument. 9400 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9401 return SemaRef.Diag(FnDecl->getLocation(), 9402 diag::err_operator_new_default_arg) 9403 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9404 9405 return false; 9406} 9407 9408static bool 9409CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) { 9410 // C++ [basic.stc.dynamic.deallocation]p1: 9411 // A program is ill-formed if deallocation functions are declared in a 9412 // namespace scope other than global scope or declared static in global 9413 // scope. 9414 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9415 return true; 9416 9417 // C++ [basic.stc.dynamic.deallocation]p2: 9418 // Each deallocation function shall return void and its first parameter 9419 // shall be void*. 9420 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9421 SemaRef.Context.VoidPtrTy, 9422 diag::err_operator_delete_dependent_param_type, 9423 diag::err_operator_delete_param_type)) 9424 return true; 9425 9426 return false; 9427} 9428 9429/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9430/// of this overloaded operator is well-formed. If so, returns false; 9431/// otherwise, emits appropriate diagnostics and returns true. 9432bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9433 assert(FnDecl && FnDecl->isOverloadedOperator() && 9434 "Expected an overloaded operator declaration"); 9435 9436 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9437 9438 // C++ [over.oper]p5: 9439 // The allocation and deallocation functions, operator new, 9440 // operator new[], operator delete and operator delete[], are 9441 // described completely in 3.7.3. The attributes and restrictions 9442 // found in the rest of this subclause do not apply to them unless 9443 // explicitly stated in 3.7.3. 9444 if (Op == OO_Delete || Op == OO_Array_Delete) 9445 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9446 9447 if (Op == OO_New || Op == OO_Array_New) 9448 return CheckOperatorNewDeclaration(*this, FnDecl); 9449 9450 // C++ [over.oper]p6: 9451 // An operator function shall either be a non-static member 9452 // function or be a non-member function and have at least one 9453 // parameter whose type is a class, a reference to a class, an 9454 // enumeration, or a reference to an enumeration. 9455 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9456 if (MethodDecl->isStatic()) 9457 return Diag(FnDecl->getLocation(), 9458 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9459 } else { 9460 bool ClassOrEnumParam = false; 9461 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9462 ParamEnd = FnDecl->param_end(); 9463 Param != ParamEnd; ++Param) { 9464 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9465 if (ParamType->isDependentType() || ParamType->isRecordType() || 9466 ParamType->isEnumeralType()) { 9467 ClassOrEnumParam = true; 9468 break; 9469 } 9470 } 9471 9472 if (!ClassOrEnumParam) 9473 return Diag(FnDecl->getLocation(), 9474 diag::err_operator_overload_needs_class_or_enum) 9475 << FnDecl->getDeclName(); 9476 } 9477 9478 // C++ [over.oper]p8: 9479 // An operator function cannot have default arguments (8.3.6), 9480 // except where explicitly stated below. 9481 // 9482 // Only the function-call operator allows default arguments 9483 // (C++ [over.call]p1). 9484 if (Op != OO_Call) { 9485 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9486 Param != FnDecl->param_end(); ++Param) { 9487 if ((*Param)->hasDefaultArg()) 9488 return Diag((*Param)->getLocation(), 9489 diag::err_operator_overload_default_arg) 9490 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9491 } 9492 } 9493 9494 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9495 { false, false, false } 9496#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9497 , { Unary, Binary, MemberOnly } 9498#include "clang/Basic/OperatorKinds.def" 9499 }; 9500 9501 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9502 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9503 bool MustBeMemberOperator = OperatorUses[Op][2]; 9504 9505 // C++ [over.oper]p8: 9506 // [...] Operator functions cannot have more or fewer parameters 9507 // than the number required for the corresponding operator, as 9508 // described in the rest of this subclause. 9509 unsigned NumParams = FnDecl->getNumParams() 9510 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9511 if (Op != OO_Call && 9512 ((NumParams == 1 && !CanBeUnaryOperator) || 9513 (NumParams == 2 && !CanBeBinaryOperator) || 9514 (NumParams < 1) || (NumParams > 2))) { 9515 // We have the wrong number of parameters. 9516 unsigned ErrorKind; 9517 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9518 ErrorKind = 2; // 2 -> unary or binary. 9519 } else if (CanBeUnaryOperator) { 9520 ErrorKind = 0; // 0 -> unary 9521 } else { 9522 assert(CanBeBinaryOperator && 9523 "All non-call overloaded operators are unary or binary!"); 9524 ErrorKind = 1; // 1 -> binary 9525 } 9526 9527 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9528 << FnDecl->getDeclName() << NumParams << ErrorKind; 9529 } 9530 9531 // Overloaded operators other than operator() cannot be variadic. 9532 if (Op != OO_Call && 9533 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9534 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9535 << FnDecl->getDeclName(); 9536 } 9537 9538 // Some operators must be non-static member functions. 9539 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9540 return Diag(FnDecl->getLocation(), 9541 diag::err_operator_overload_must_be_member) 9542 << FnDecl->getDeclName(); 9543 } 9544 9545 // C++ [over.inc]p1: 9546 // The user-defined function called operator++ implements the 9547 // prefix and postfix ++ operator. If this function is a member 9548 // function with no parameters, or a non-member function with one 9549 // parameter of class or enumeration type, it defines the prefix 9550 // increment operator ++ for objects of that type. If the function 9551 // is a member function with one parameter (which shall be of type 9552 // int) or a non-member function with two parameters (the second 9553 // of which shall be of type int), it defines the postfix 9554 // increment operator ++ for objects of that type. 9555 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9556 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9557 bool ParamIsInt = false; 9558 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9559 ParamIsInt = BT->getKind() == BuiltinType::Int; 9560 9561 if (!ParamIsInt) 9562 return Diag(LastParam->getLocation(), 9563 diag::err_operator_overload_post_incdec_must_be_int) 9564 << LastParam->getType() << (Op == OO_MinusMinus); 9565 } 9566 9567 return false; 9568} 9569 9570/// CheckLiteralOperatorDeclaration - Check whether the declaration 9571/// of this literal operator function is well-formed. If so, returns 9572/// false; otherwise, emits appropriate diagnostics and returns true. 9573bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9574 if (isa<CXXMethodDecl>(FnDecl)) { 9575 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9576 << FnDecl->getDeclName(); 9577 return true; 9578 } 9579 9580 if (FnDecl->isExternC()) { 9581 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 9582 return true; 9583 } 9584 9585 bool Valid = false; 9586 9587 // This might be the definition of a literal operator template. 9588 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 9589 // This might be a specialization of a literal operator template. 9590 if (!TpDecl) 9591 TpDecl = FnDecl->getPrimaryTemplate(); 9592 9593 // template <char...> type operator "" name() is the only valid template 9594 // signature, and the only valid signature with no parameters. 9595 if (TpDecl) { 9596 if (FnDecl->param_size() == 0) { 9597 // Must have only one template parameter 9598 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9599 if (Params->size() == 1) { 9600 NonTypeTemplateParmDecl *PmDecl = 9601 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9602 9603 // The template parameter must be a char parameter pack. 9604 if (PmDecl && PmDecl->isTemplateParameterPack() && 9605 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9606 Valid = true; 9607 } 9608 } 9609 } else if (FnDecl->param_size()) { 9610 // Check the first parameter 9611 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9612 9613 QualType T = (*Param)->getType().getUnqualifiedType(); 9614 9615 // unsigned long long int, long double, and any character type are allowed 9616 // as the only parameters. 9617 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9618 Context.hasSameType(T, Context.LongDoubleTy) || 9619 Context.hasSameType(T, Context.CharTy) || 9620 Context.hasSameType(T, Context.WCharTy) || 9621 Context.hasSameType(T, Context.Char16Ty) || 9622 Context.hasSameType(T, Context.Char32Ty)) { 9623 if (++Param == FnDecl->param_end()) 9624 Valid = true; 9625 goto FinishedParams; 9626 } 9627 9628 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9629 const PointerType *PT = T->getAs<PointerType>(); 9630 if (!PT) 9631 goto FinishedParams; 9632 T = PT->getPointeeType(); 9633 if (!T.isConstQualified() || T.isVolatileQualified()) 9634 goto FinishedParams; 9635 T = T.getUnqualifiedType(); 9636 9637 // Move on to the second parameter; 9638 ++Param; 9639 9640 // If there is no second parameter, the first must be a const char * 9641 if (Param == FnDecl->param_end()) { 9642 if (Context.hasSameType(T, Context.CharTy)) 9643 Valid = true; 9644 goto FinishedParams; 9645 } 9646 9647 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9648 // are allowed as the first parameter to a two-parameter function 9649 if (!(Context.hasSameType(T, Context.CharTy) || 9650 Context.hasSameType(T, Context.WCharTy) || 9651 Context.hasSameType(T, Context.Char16Ty) || 9652 Context.hasSameType(T, Context.Char32Ty))) 9653 goto FinishedParams; 9654 9655 // The second and final parameter must be an std::size_t 9656 T = (*Param)->getType().getUnqualifiedType(); 9657 if (Context.hasSameType(T, Context.getSizeType()) && 9658 ++Param == FnDecl->param_end()) 9659 Valid = true; 9660 } 9661 9662 // FIXME: This diagnostic is absolutely terrible. 9663FinishedParams: 9664 if (!Valid) { 9665 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9666 << FnDecl->getDeclName(); 9667 return true; 9668 } 9669 9670 // A parameter-declaration-clause containing a default argument is not 9671 // equivalent to any of the permitted forms. 9672 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9673 ParamEnd = FnDecl->param_end(); 9674 Param != ParamEnd; ++Param) { 9675 if ((*Param)->hasDefaultArg()) { 9676 Diag((*Param)->getDefaultArgRange().getBegin(), 9677 diag::err_literal_operator_default_argument) 9678 << (*Param)->getDefaultArgRange(); 9679 break; 9680 } 9681 } 9682 9683 StringRef LiteralName 9684 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9685 if (LiteralName[0] != '_') { 9686 // C++11 [usrlit.suffix]p1: 9687 // Literal suffix identifiers that do not start with an underscore 9688 // are reserved for future standardization. 9689 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9690 } 9691 9692 return false; 9693} 9694 9695/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9696/// linkage specification, including the language and (if present) 9697/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9698/// the location of the language string literal, which is provided 9699/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9700/// the '{' brace. Otherwise, this linkage specification does not 9701/// have any braces. 9702Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9703 SourceLocation LangLoc, 9704 StringRef Lang, 9705 SourceLocation LBraceLoc) { 9706 LinkageSpecDecl::LanguageIDs Language; 9707 if (Lang == "\"C\"") 9708 Language = LinkageSpecDecl::lang_c; 9709 else if (Lang == "\"C++\"") 9710 Language = LinkageSpecDecl::lang_cxx; 9711 else { 9712 Diag(LangLoc, diag::err_bad_language); 9713 return 0; 9714 } 9715 9716 // FIXME: Add all the various semantics of linkage specifications 9717 9718 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9719 ExternLoc, LangLoc, Language); 9720 CurContext->addDecl(D); 9721 PushDeclContext(S, D); 9722 return D; 9723} 9724 9725/// ActOnFinishLinkageSpecification - Complete the definition of 9726/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9727/// valid, it's the position of the closing '}' brace in a linkage 9728/// specification that uses braces. 9729Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9730 Decl *LinkageSpec, 9731 SourceLocation RBraceLoc) { 9732 if (LinkageSpec) { 9733 if (RBraceLoc.isValid()) { 9734 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9735 LSDecl->setRBraceLoc(RBraceLoc); 9736 } 9737 PopDeclContext(); 9738 } 9739 return LinkageSpec; 9740} 9741 9742/// \brief Perform semantic analysis for the variable declaration that 9743/// occurs within a C++ catch clause, returning the newly-created 9744/// variable. 9745VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9746 TypeSourceInfo *TInfo, 9747 SourceLocation StartLoc, 9748 SourceLocation Loc, 9749 IdentifierInfo *Name) { 9750 bool Invalid = false; 9751 QualType ExDeclType = TInfo->getType(); 9752 9753 // Arrays and functions decay. 9754 if (ExDeclType->isArrayType()) 9755 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9756 else if (ExDeclType->isFunctionType()) 9757 ExDeclType = Context.getPointerType(ExDeclType); 9758 9759 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9760 // The exception-declaration shall not denote a pointer or reference to an 9761 // incomplete type, other than [cv] void*. 9762 // N2844 forbids rvalue references. 9763 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9764 Diag(Loc, diag::err_catch_rvalue_ref); 9765 Invalid = true; 9766 } 9767 9768 QualType BaseType = ExDeclType; 9769 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9770 unsigned DK = diag::err_catch_incomplete; 9771 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9772 BaseType = Ptr->getPointeeType(); 9773 Mode = 1; 9774 DK = diag::err_catch_incomplete_ptr; 9775 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9776 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9777 BaseType = Ref->getPointeeType(); 9778 Mode = 2; 9779 DK = diag::err_catch_incomplete_ref; 9780 } 9781 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9782 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9783 Invalid = true; 9784 9785 if (!Invalid && !ExDeclType->isDependentType() && 9786 RequireNonAbstractType(Loc, ExDeclType, 9787 diag::err_abstract_type_in_decl, 9788 AbstractVariableType)) 9789 Invalid = true; 9790 9791 // Only the non-fragile NeXT runtime currently supports C++ catches 9792 // of ObjC types, and no runtime supports catching ObjC types by value. 9793 if (!Invalid && getLangOpts().ObjC1) { 9794 QualType T = ExDeclType; 9795 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9796 T = RT->getPointeeType(); 9797 9798 if (T->isObjCObjectType()) { 9799 Diag(Loc, diag::err_objc_object_catch); 9800 Invalid = true; 9801 } else if (T->isObjCObjectPointerType()) { 9802 // FIXME: should this be a test for macosx-fragile specifically? 9803 if (getLangOpts().ObjCRuntime.isFragile()) 9804 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9805 } 9806 } 9807 9808 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9809 ExDeclType, TInfo, SC_None, SC_None); 9810 ExDecl->setExceptionVariable(true); 9811 9812 // In ARC, infer 'retaining' for variables of retainable type. 9813 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9814 Invalid = true; 9815 9816 if (!Invalid && !ExDeclType->isDependentType()) { 9817 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9818 // C++ [except.handle]p16: 9819 // The object declared in an exception-declaration or, if the 9820 // exception-declaration does not specify a name, a temporary (12.2) is 9821 // copy-initialized (8.5) from the exception object. [...] 9822 // The object is destroyed when the handler exits, after the destruction 9823 // of any automatic objects initialized within the handler. 9824 // 9825 // We just pretend to initialize the object with itself, then make sure 9826 // it can be destroyed later. 9827 QualType initType = ExDeclType; 9828 9829 InitializedEntity entity = 9830 InitializedEntity::InitializeVariable(ExDecl); 9831 InitializationKind initKind = 9832 InitializationKind::CreateCopy(Loc, SourceLocation()); 9833 9834 Expr *opaqueValue = 9835 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9836 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9837 ExprResult result = sequence.Perform(*this, entity, initKind, 9838 MultiExprArg(&opaqueValue, 1)); 9839 if (result.isInvalid()) 9840 Invalid = true; 9841 else { 9842 // If the constructor used was non-trivial, set this as the 9843 // "initializer". 9844 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9845 if (!construct->getConstructor()->isTrivial()) { 9846 Expr *init = MaybeCreateExprWithCleanups(construct); 9847 ExDecl->setInit(init); 9848 } 9849 9850 // And make sure it's destructable. 9851 FinalizeVarWithDestructor(ExDecl, recordType); 9852 } 9853 } 9854 } 9855 9856 if (Invalid) 9857 ExDecl->setInvalidDecl(); 9858 9859 return ExDecl; 9860} 9861 9862/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9863/// handler. 9864Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9865 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9866 bool Invalid = D.isInvalidType(); 9867 9868 // Check for unexpanded parameter packs. 9869 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9870 UPPC_ExceptionType)) { 9871 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9872 D.getIdentifierLoc()); 9873 Invalid = true; 9874 } 9875 9876 IdentifierInfo *II = D.getIdentifier(); 9877 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9878 LookupOrdinaryName, 9879 ForRedeclaration)) { 9880 // The scope should be freshly made just for us. There is just no way 9881 // it contains any previous declaration. 9882 assert(!S->isDeclScope(PrevDecl)); 9883 if (PrevDecl->isTemplateParameter()) { 9884 // Maybe we will complain about the shadowed template parameter. 9885 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9886 PrevDecl = 0; 9887 } 9888 } 9889 9890 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9891 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9892 << D.getCXXScopeSpec().getRange(); 9893 Invalid = true; 9894 } 9895 9896 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9897 D.getLocStart(), 9898 D.getIdentifierLoc(), 9899 D.getIdentifier()); 9900 if (Invalid) 9901 ExDecl->setInvalidDecl(); 9902 9903 // Add the exception declaration into this scope. 9904 if (II) 9905 PushOnScopeChains(ExDecl, S); 9906 else 9907 CurContext->addDecl(ExDecl); 9908 9909 ProcessDeclAttributes(S, ExDecl, D); 9910 return ExDecl; 9911} 9912 9913Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9914 Expr *AssertExpr, 9915 Expr *AssertMessageExpr, 9916 SourceLocation RParenLoc) { 9917 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 9918 9919 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9920 return 0; 9921 9922 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 9923 AssertMessage, RParenLoc, false); 9924} 9925 9926Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9927 Expr *AssertExpr, 9928 StringLiteral *AssertMessage, 9929 SourceLocation RParenLoc, 9930 bool Failed) { 9931 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 9932 !Failed) { 9933 // In a static_assert-declaration, the constant-expression shall be a 9934 // constant expression that can be contextually converted to bool. 9935 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9936 if (Converted.isInvalid()) 9937 Failed = true; 9938 9939 llvm::APSInt Cond; 9940 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 9941 diag::err_static_assert_expression_is_not_constant, 9942 /*AllowFold=*/false).isInvalid()) 9943 Failed = true; 9944 9945 if (!Failed && !Cond) { 9946 llvm::SmallString<256> MsgBuffer; 9947 llvm::raw_svector_ostream Msg(MsgBuffer); 9948 AssertMessage->printPretty(Msg, 0, getPrintingPolicy()); 9949 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9950 << Msg.str() << AssertExpr->getSourceRange(); 9951 Failed = true; 9952 } 9953 } 9954 9955 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9956 AssertExpr, AssertMessage, RParenLoc, 9957 Failed); 9958 9959 CurContext->addDecl(Decl); 9960 return Decl; 9961} 9962 9963/// \brief Perform semantic analysis of the given friend type declaration. 9964/// 9965/// \returns A friend declaration that. 9966FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart, 9967 SourceLocation FriendLoc, 9968 TypeSourceInfo *TSInfo) { 9969 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9970 9971 QualType T = TSInfo->getType(); 9972 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9973 9974 // C++03 [class.friend]p2: 9975 // An elaborated-type-specifier shall be used in a friend declaration 9976 // for a class.* 9977 // 9978 // * The class-key of the elaborated-type-specifier is required. 9979 if (!ActiveTemplateInstantiations.empty()) { 9980 // Do not complain about the form of friend template types during 9981 // template instantiation; we will already have complained when the 9982 // template was declared. 9983 } else if (!T->isElaboratedTypeSpecifier()) { 9984 // If we evaluated the type to a record type, suggest putting 9985 // a tag in front. 9986 if (const RecordType *RT = T->getAs<RecordType>()) { 9987 RecordDecl *RD = RT->getDecl(); 9988 9989 std::string InsertionText = std::string(" ") + RD->getKindName(); 9990 9991 Diag(TypeRange.getBegin(), 9992 getLangOpts().CPlusPlus0x ? 9993 diag::warn_cxx98_compat_unelaborated_friend_type : 9994 diag::ext_unelaborated_friend_type) 9995 << (unsigned) RD->getTagKind() 9996 << T 9997 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9998 InsertionText); 9999 } else { 10000 Diag(FriendLoc, 10001 getLangOpts().CPlusPlus0x ? 10002 diag::warn_cxx98_compat_nonclass_type_friend : 10003 diag::ext_nonclass_type_friend) 10004 << T 10005 << TypeRange; 10006 } 10007 } else if (T->getAs<EnumType>()) { 10008 Diag(FriendLoc, 10009 getLangOpts().CPlusPlus0x ? 10010 diag::warn_cxx98_compat_enum_friend : 10011 diag::ext_enum_friend) 10012 << T 10013 << TypeRange; 10014 } 10015 10016 // C++11 [class.friend]p3: 10017 // A friend declaration that does not declare a function shall have one 10018 // of the following forms: 10019 // friend elaborated-type-specifier ; 10020 // friend simple-type-specifier ; 10021 // friend typename-specifier ; 10022 if (getLangOpts().CPlusPlus0x && LocStart != FriendLoc) 10023 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T; 10024 10025 // If the type specifier in a friend declaration designates a (possibly 10026 // cv-qualified) class type, that class is declared as a friend; otherwise, 10027 // the friend declaration is ignored. 10028 return FriendDecl::Create(Context, CurContext, LocStart, TSInfo, FriendLoc); 10029} 10030 10031/// Handle a friend tag declaration where the scope specifier was 10032/// templated. 10033Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 10034 unsigned TagSpec, SourceLocation TagLoc, 10035 CXXScopeSpec &SS, 10036 IdentifierInfo *Name, SourceLocation NameLoc, 10037 AttributeList *Attr, 10038 MultiTemplateParamsArg TempParamLists) { 10039 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 10040 10041 bool isExplicitSpecialization = false; 10042 bool Invalid = false; 10043 10044 if (TemplateParameterList *TemplateParams 10045 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 10046 TempParamLists.data(), 10047 TempParamLists.size(), 10048 /*friend*/ true, 10049 isExplicitSpecialization, 10050 Invalid)) { 10051 if (TemplateParams->size() > 0) { 10052 // This is a declaration of a class template. 10053 if (Invalid) 10054 return 0; 10055 10056 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 10057 SS, Name, NameLoc, Attr, 10058 TemplateParams, AS_public, 10059 /*ModulePrivateLoc=*/SourceLocation(), 10060 TempParamLists.size() - 1, 10061 TempParamLists.data()).take(); 10062 } else { 10063 // The "template<>" header is extraneous. 10064 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 10065 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 10066 isExplicitSpecialization = true; 10067 } 10068 } 10069 10070 if (Invalid) return 0; 10071 10072 bool isAllExplicitSpecializations = true; 10073 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 10074 if (TempParamLists[I]->size()) { 10075 isAllExplicitSpecializations = false; 10076 break; 10077 } 10078 } 10079 10080 // FIXME: don't ignore attributes. 10081 10082 // If it's explicit specializations all the way down, just forget 10083 // about the template header and build an appropriate non-templated 10084 // friend. TODO: for source fidelity, remember the headers. 10085 if (isAllExplicitSpecializations) { 10086 if (SS.isEmpty()) { 10087 bool Owned = false; 10088 bool IsDependent = false; 10089 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 10090 Attr, AS_public, 10091 /*ModulePrivateLoc=*/SourceLocation(), 10092 MultiTemplateParamsArg(), Owned, IsDependent, 10093 /*ScopedEnumKWLoc=*/SourceLocation(), 10094 /*ScopedEnumUsesClassTag=*/false, 10095 /*UnderlyingType=*/TypeResult()); 10096 } 10097 10098 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 10099 ElaboratedTypeKeyword Keyword 10100 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10101 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 10102 *Name, NameLoc); 10103 if (T.isNull()) 10104 return 0; 10105 10106 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10107 if (isa<DependentNameType>(T)) { 10108 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10109 TL.setElaboratedKeywordLoc(TagLoc); 10110 TL.setQualifierLoc(QualifierLoc); 10111 TL.setNameLoc(NameLoc); 10112 } else { 10113 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 10114 TL.setElaboratedKeywordLoc(TagLoc); 10115 TL.setQualifierLoc(QualifierLoc); 10116 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 10117 } 10118 10119 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10120 TSI, FriendLoc); 10121 Friend->setAccess(AS_public); 10122 CurContext->addDecl(Friend); 10123 return Friend; 10124 } 10125 10126 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 10127 10128 10129 10130 // Handle the case of a templated-scope friend class. e.g. 10131 // template <class T> class A<T>::B; 10132 // FIXME: we don't support these right now. 10133 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10134 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10135 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10136 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10137 TL.setElaboratedKeywordLoc(TagLoc); 10138 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10139 TL.setNameLoc(NameLoc); 10140 10141 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10142 TSI, FriendLoc); 10143 Friend->setAccess(AS_public); 10144 Friend->setUnsupportedFriend(true); 10145 CurContext->addDecl(Friend); 10146 return Friend; 10147} 10148 10149 10150/// Handle a friend type declaration. This works in tandem with 10151/// ActOnTag. 10152/// 10153/// Notes on friend class templates: 10154/// 10155/// We generally treat friend class declarations as if they were 10156/// declaring a class. So, for example, the elaborated type specifier 10157/// in a friend declaration is required to obey the restrictions of a 10158/// class-head (i.e. no typedefs in the scope chain), template 10159/// parameters are required to match up with simple template-ids, &c. 10160/// However, unlike when declaring a template specialization, it's 10161/// okay to refer to a template specialization without an empty 10162/// template parameter declaration, e.g. 10163/// friend class A<T>::B<unsigned>; 10164/// We permit this as a special case; if there are any template 10165/// parameters present at all, require proper matching, i.e. 10166/// template <> template \<class T> friend class A<int>::B; 10167Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10168 MultiTemplateParamsArg TempParams) { 10169 SourceLocation Loc = DS.getLocStart(); 10170 10171 assert(DS.isFriendSpecified()); 10172 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10173 10174 // Try to convert the decl specifier to a type. This works for 10175 // friend templates because ActOnTag never produces a ClassTemplateDecl 10176 // for a TUK_Friend. 10177 Declarator TheDeclarator(DS, Declarator::MemberContext); 10178 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10179 QualType T = TSI->getType(); 10180 if (TheDeclarator.isInvalidType()) 10181 return 0; 10182 10183 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10184 return 0; 10185 10186 // This is definitely an error in C++98. It's probably meant to 10187 // be forbidden in C++0x, too, but the specification is just 10188 // poorly written. 10189 // 10190 // The problem is with declarations like the following: 10191 // template <T> friend A<T>::foo; 10192 // where deciding whether a class C is a friend or not now hinges 10193 // on whether there exists an instantiation of A that causes 10194 // 'foo' to equal C. There are restrictions on class-heads 10195 // (which we declare (by fiat) elaborated friend declarations to 10196 // be) that makes this tractable. 10197 // 10198 // FIXME: handle "template <> friend class A<T>;", which 10199 // is possibly well-formed? Who even knows? 10200 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10201 Diag(Loc, diag::err_tagless_friend_type_template) 10202 << DS.getSourceRange(); 10203 return 0; 10204 } 10205 10206 // C++98 [class.friend]p1: A friend of a class is a function 10207 // or class that is not a member of the class . . . 10208 // This is fixed in DR77, which just barely didn't make the C++03 10209 // deadline. It's also a very silly restriction that seriously 10210 // affects inner classes and which nobody else seems to implement; 10211 // thus we never diagnose it, not even in -pedantic. 10212 // 10213 // But note that we could warn about it: it's always useless to 10214 // friend one of your own members (it's not, however, worthless to 10215 // friend a member of an arbitrary specialization of your template). 10216 10217 Decl *D; 10218 if (unsigned NumTempParamLists = TempParams.size()) 10219 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10220 NumTempParamLists, 10221 TempParams.data(), 10222 TSI, 10223 DS.getFriendSpecLoc()); 10224 else 10225 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10226 10227 if (!D) 10228 return 0; 10229 10230 D->setAccess(AS_public); 10231 CurContext->addDecl(D); 10232 10233 return D; 10234} 10235 10236Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10237 MultiTemplateParamsArg TemplateParams) { 10238 const DeclSpec &DS = D.getDeclSpec(); 10239 10240 assert(DS.isFriendSpecified()); 10241 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10242 10243 SourceLocation Loc = D.getIdentifierLoc(); 10244 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10245 10246 // C++ [class.friend]p1 10247 // A friend of a class is a function or class.... 10248 // Note that this sees through typedefs, which is intended. 10249 // It *doesn't* see through dependent types, which is correct 10250 // according to [temp.arg.type]p3: 10251 // If a declaration acquires a function type through a 10252 // type dependent on a template-parameter and this causes 10253 // a declaration that does not use the syntactic form of a 10254 // function declarator to have a function type, the program 10255 // is ill-formed. 10256 if (!TInfo->getType()->isFunctionType()) { 10257 Diag(Loc, diag::err_unexpected_friend); 10258 10259 // It might be worthwhile to try to recover by creating an 10260 // appropriate declaration. 10261 return 0; 10262 } 10263 10264 // C++ [namespace.memdef]p3 10265 // - If a friend declaration in a non-local class first declares a 10266 // class or function, the friend class or function is a member 10267 // of the innermost enclosing namespace. 10268 // - The name of the friend is not found by simple name lookup 10269 // until a matching declaration is provided in that namespace 10270 // scope (either before or after the class declaration granting 10271 // friendship). 10272 // - If a friend function is called, its name may be found by the 10273 // name lookup that considers functions from namespaces and 10274 // classes associated with the types of the function arguments. 10275 // - When looking for a prior declaration of a class or a function 10276 // declared as a friend, scopes outside the innermost enclosing 10277 // namespace scope are not considered. 10278 10279 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10280 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10281 DeclarationName Name = NameInfo.getName(); 10282 assert(Name); 10283 10284 // Check for unexpanded parameter packs. 10285 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10286 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10287 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10288 return 0; 10289 10290 // The context we found the declaration in, or in which we should 10291 // create the declaration. 10292 DeclContext *DC; 10293 Scope *DCScope = S; 10294 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10295 ForRedeclaration); 10296 10297 // FIXME: there are different rules in local classes 10298 10299 // There are four cases here. 10300 // - There's no scope specifier, in which case we just go to the 10301 // appropriate scope and look for a function or function template 10302 // there as appropriate. 10303 // Recover from invalid scope qualifiers as if they just weren't there. 10304 if (SS.isInvalid() || !SS.isSet()) { 10305 // C++0x [namespace.memdef]p3: 10306 // If the name in a friend declaration is neither qualified nor 10307 // a template-id and the declaration is a function or an 10308 // elaborated-type-specifier, the lookup to determine whether 10309 // the entity has been previously declared shall not consider 10310 // any scopes outside the innermost enclosing namespace. 10311 // C++0x [class.friend]p11: 10312 // If a friend declaration appears in a local class and the name 10313 // specified is an unqualified name, a prior declaration is 10314 // looked up without considering scopes that are outside the 10315 // innermost enclosing non-class scope. For a friend function 10316 // declaration, if there is no prior declaration, the program is 10317 // ill-formed. 10318 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10319 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10320 10321 // Find the appropriate context according to the above. 10322 DC = CurContext; 10323 while (true) { 10324 // Skip class contexts. If someone can cite chapter and verse 10325 // for this behavior, that would be nice --- it's what GCC and 10326 // EDG do, and it seems like a reasonable intent, but the spec 10327 // really only says that checks for unqualified existing 10328 // declarations should stop at the nearest enclosing namespace, 10329 // not that they should only consider the nearest enclosing 10330 // namespace. 10331 while (DC->isRecord() || DC->isTransparentContext()) 10332 DC = DC->getParent(); 10333 10334 LookupQualifiedName(Previous, DC); 10335 10336 // TODO: decide what we think about using declarations. 10337 if (isLocal || !Previous.empty()) 10338 break; 10339 10340 if (isTemplateId) { 10341 if (isa<TranslationUnitDecl>(DC)) break; 10342 } else { 10343 if (DC->isFileContext()) break; 10344 } 10345 DC = DC->getParent(); 10346 } 10347 10348 // C++ [class.friend]p1: A friend of a class is a function or 10349 // class that is not a member of the class . . . 10350 // C++11 changes this for both friend types and functions. 10351 // Most C++ 98 compilers do seem to give an error here, so 10352 // we do, too. 10353 if (!Previous.empty() && DC->Equals(CurContext)) 10354 Diag(DS.getFriendSpecLoc(), 10355 getLangOpts().CPlusPlus0x ? 10356 diag::warn_cxx98_compat_friend_is_member : 10357 diag::err_friend_is_member); 10358 10359 DCScope = getScopeForDeclContext(S, DC); 10360 10361 // C++ [class.friend]p6: 10362 // A function can be defined in a friend declaration of a class if and 10363 // only if the class is a non-local class (9.8), the function name is 10364 // unqualified, and the function has namespace scope. 10365 if (isLocal && D.isFunctionDefinition()) { 10366 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10367 } 10368 10369 // - There's a non-dependent scope specifier, in which case we 10370 // compute it and do a previous lookup there for a function 10371 // or function template. 10372 } else if (!SS.getScopeRep()->isDependent()) { 10373 DC = computeDeclContext(SS); 10374 if (!DC) return 0; 10375 10376 if (RequireCompleteDeclContext(SS, DC)) return 0; 10377 10378 LookupQualifiedName(Previous, DC); 10379 10380 // Ignore things found implicitly in the wrong scope. 10381 // TODO: better diagnostics for this case. Suggesting the right 10382 // qualified scope would be nice... 10383 LookupResult::Filter F = Previous.makeFilter(); 10384 while (F.hasNext()) { 10385 NamedDecl *D = F.next(); 10386 if (!DC->InEnclosingNamespaceSetOf( 10387 D->getDeclContext()->getRedeclContext())) 10388 F.erase(); 10389 } 10390 F.done(); 10391 10392 if (Previous.empty()) { 10393 D.setInvalidType(); 10394 Diag(Loc, diag::err_qualified_friend_not_found) 10395 << Name << TInfo->getType(); 10396 return 0; 10397 } 10398 10399 // C++ [class.friend]p1: A friend of a class is a function or 10400 // class that is not a member of the class . . . 10401 if (DC->Equals(CurContext)) 10402 Diag(DS.getFriendSpecLoc(), 10403 getLangOpts().CPlusPlus0x ? 10404 diag::warn_cxx98_compat_friend_is_member : 10405 diag::err_friend_is_member); 10406 10407 if (D.isFunctionDefinition()) { 10408 // C++ [class.friend]p6: 10409 // A function can be defined in a friend declaration of a class if and 10410 // only if the class is a non-local class (9.8), the function name is 10411 // unqualified, and the function has namespace scope. 10412 SemaDiagnosticBuilder DB 10413 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10414 10415 DB << SS.getScopeRep(); 10416 if (DC->isFileContext()) 10417 DB << FixItHint::CreateRemoval(SS.getRange()); 10418 SS.clear(); 10419 } 10420 10421 // - There's a scope specifier that does not match any template 10422 // parameter lists, in which case we use some arbitrary context, 10423 // create a method or method template, and wait for instantiation. 10424 // - There's a scope specifier that does match some template 10425 // parameter lists, which we don't handle right now. 10426 } else { 10427 if (D.isFunctionDefinition()) { 10428 // C++ [class.friend]p6: 10429 // A function can be defined in a friend declaration of a class if and 10430 // only if the class is a non-local class (9.8), the function name is 10431 // unqualified, and the function has namespace scope. 10432 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10433 << SS.getScopeRep(); 10434 } 10435 10436 DC = CurContext; 10437 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10438 } 10439 10440 if (!DC->isRecord()) { 10441 // This implies that it has to be an operator or function. 10442 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10443 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10444 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10445 Diag(Loc, diag::err_introducing_special_friend) << 10446 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10447 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10448 return 0; 10449 } 10450 } 10451 10452 // FIXME: This is an egregious hack to cope with cases where the scope stack 10453 // does not contain the declaration context, i.e., in an out-of-line 10454 // definition of a class. 10455 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10456 if (!DCScope) { 10457 FakeDCScope.setEntity(DC); 10458 DCScope = &FakeDCScope; 10459 } 10460 10461 bool AddToScope = true; 10462 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10463 TemplateParams, AddToScope); 10464 if (!ND) return 0; 10465 10466 assert(ND->getDeclContext() == DC); 10467 assert(ND->getLexicalDeclContext() == CurContext); 10468 10469 // Add the function declaration to the appropriate lookup tables, 10470 // adjusting the redeclarations list as necessary. We don't 10471 // want to do this yet if the friending class is dependent. 10472 // 10473 // Also update the scope-based lookup if the target context's 10474 // lookup context is in lexical scope. 10475 if (!CurContext->isDependentContext()) { 10476 DC = DC->getRedeclContext(); 10477 DC->makeDeclVisibleInContext(ND); 10478 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10479 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10480 } 10481 10482 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10483 D.getIdentifierLoc(), ND, 10484 DS.getFriendSpecLoc()); 10485 FrD->setAccess(AS_public); 10486 CurContext->addDecl(FrD); 10487 10488 if (ND->isInvalidDecl()) { 10489 FrD->setInvalidDecl(); 10490 } else { 10491 if (DC->isRecord()) CheckFriendAccess(ND); 10492 10493 FunctionDecl *FD; 10494 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10495 FD = FTD->getTemplatedDecl(); 10496 else 10497 FD = cast<FunctionDecl>(ND); 10498 10499 // Mark templated-scope function declarations as unsupported. 10500 if (FD->getNumTemplateParameterLists()) 10501 FrD->setUnsupportedFriend(true); 10502 } 10503 10504 return ND; 10505} 10506 10507void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10508 AdjustDeclIfTemplate(Dcl); 10509 10510 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10511 if (!Fn) { 10512 Diag(DelLoc, diag::err_deleted_non_function); 10513 return; 10514 } 10515 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10516 // Don't consider the implicit declaration we generate for explicit 10517 // specializations. FIXME: Do not generate these implicit declarations. 10518 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 10519 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 10520 Diag(DelLoc, diag::err_deleted_decl_not_first); 10521 Diag(Prev->getLocation(), diag::note_previous_declaration); 10522 } 10523 // If the declaration wasn't the first, we delete the function anyway for 10524 // recovery. 10525 } 10526 Fn->setDeletedAsWritten(); 10527 10528 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10529 if (!MD) 10530 return; 10531 10532 // A deleted special member function is trivial if the corresponding 10533 // implicitly-declared function would have been. 10534 switch (getSpecialMember(MD)) { 10535 case CXXInvalid: 10536 break; 10537 case CXXDefaultConstructor: 10538 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor()); 10539 break; 10540 case CXXCopyConstructor: 10541 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor()); 10542 break; 10543 case CXXMoveConstructor: 10544 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor()); 10545 break; 10546 case CXXCopyAssignment: 10547 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 10548 break; 10549 case CXXMoveAssignment: 10550 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 10551 break; 10552 case CXXDestructor: 10553 MD->setTrivial(MD->getParent()->hasTrivialDestructor()); 10554 break; 10555 } 10556} 10557 10558void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10559 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10560 10561 if (MD) { 10562 if (MD->getParent()->isDependentType()) { 10563 MD->setDefaulted(); 10564 MD->setExplicitlyDefaulted(); 10565 return; 10566 } 10567 10568 CXXSpecialMember Member = getSpecialMember(MD); 10569 if (Member == CXXInvalid) { 10570 Diag(DefaultLoc, diag::err_default_special_members); 10571 return; 10572 } 10573 10574 MD->setDefaulted(); 10575 MD->setExplicitlyDefaulted(); 10576 10577 // If this definition appears within the record, do the checking when 10578 // the record is complete. 10579 const FunctionDecl *Primary = MD; 10580 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern()) 10581 // Find the uninstantiated declaration that actually had the '= default' 10582 // on it. 10583 Pattern->isDefined(Primary); 10584 10585 if (Primary == Primary->getCanonicalDecl()) 10586 return; 10587 10588 CheckExplicitlyDefaultedSpecialMember(MD); 10589 10590 switch (Member) { 10591 case CXXDefaultConstructor: { 10592 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10593 if (!CD->isInvalidDecl()) 10594 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10595 break; 10596 } 10597 10598 case CXXCopyConstructor: { 10599 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10600 if (!CD->isInvalidDecl()) 10601 DefineImplicitCopyConstructor(DefaultLoc, CD); 10602 break; 10603 } 10604 10605 case CXXCopyAssignment: { 10606 if (!MD->isInvalidDecl()) 10607 DefineImplicitCopyAssignment(DefaultLoc, MD); 10608 break; 10609 } 10610 10611 case CXXDestructor: { 10612 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10613 if (!DD->isInvalidDecl()) 10614 DefineImplicitDestructor(DefaultLoc, DD); 10615 break; 10616 } 10617 10618 case CXXMoveConstructor: { 10619 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10620 if (!CD->isInvalidDecl()) 10621 DefineImplicitMoveConstructor(DefaultLoc, CD); 10622 break; 10623 } 10624 10625 case CXXMoveAssignment: { 10626 if (!MD->isInvalidDecl()) 10627 DefineImplicitMoveAssignment(DefaultLoc, MD); 10628 break; 10629 } 10630 10631 case CXXInvalid: 10632 llvm_unreachable("Invalid special member."); 10633 } 10634 } else { 10635 Diag(DefaultLoc, diag::err_default_special_members); 10636 } 10637} 10638 10639static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10640 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10641 Stmt *SubStmt = *CI; 10642 if (!SubStmt) 10643 continue; 10644 if (isa<ReturnStmt>(SubStmt)) 10645 Self.Diag(SubStmt->getLocStart(), 10646 diag::err_return_in_constructor_handler); 10647 if (!isa<Expr>(SubStmt)) 10648 SearchForReturnInStmt(Self, SubStmt); 10649 } 10650} 10651 10652void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10653 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10654 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10655 SearchForReturnInStmt(*this, Handler); 10656 } 10657} 10658 10659bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10660 const CXXMethodDecl *Old) { 10661 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10662 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10663 10664 if (Context.hasSameType(NewTy, OldTy) || 10665 NewTy->isDependentType() || OldTy->isDependentType()) 10666 return false; 10667 10668 // Check if the return types are covariant 10669 QualType NewClassTy, OldClassTy; 10670 10671 /// Both types must be pointers or references to classes. 10672 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10673 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10674 NewClassTy = NewPT->getPointeeType(); 10675 OldClassTy = OldPT->getPointeeType(); 10676 } 10677 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10678 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10679 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10680 NewClassTy = NewRT->getPointeeType(); 10681 OldClassTy = OldRT->getPointeeType(); 10682 } 10683 } 10684 } 10685 10686 // The return types aren't either both pointers or references to a class type. 10687 if (NewClassTy.isNull()) { 10688 Diag(New->getLocation(), 10689 diag::err_different_return_type_for_overriding_virtual_function) 10690 << New->getDeclName() << NewTy << OldTy; 10691 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10692 10693 return true; 10694 } 10695 10696 // C++ [class.virtual]p6: 10697 // If the return type of D::f differs from the return type of B::f, the 10698 // class type in the return type of D::f shall be complete at the point of 10699 // declaration of D::f or shall be the class type D. 10700 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10701 if (!RT->isBeingDefined() && 10702 RequireCompleteType(New->getLocation(), NewClassTy, 10703 diag::err_covariant_return_incomplete, 10704 New->getDeclName())) 10705 return true; 10706 } 10707 10708 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10709 // Check if the new class derives from the old class. 10710 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10711 Diag(New->getLocation(), 10712 diag::err_covariant_return_not_derived) 10713 << New->getDeclName() << NewTy << OldTy; 10714 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10715 return true; 10716 } 10717 10718 // Check if we the conversion from derived to base is valid. 10719 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10720 diag::err_covariant_return_inaccessible_base, 10721 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10722 // FIXME: Should this point to the return type? 10723 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10724 // FIXME: this note won't trigger for delayed access control 10725 // diagnostics, and it's impossible to get an undelayed error 10726 // here from access control during the original parse because 10727 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10728 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10729 return true; 10730 } 10731 } 10732 10733 // The qualifiers of the return types must be the same. 10734 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10735 Diag(New->getLocation(), 10736 diag::err_covariant_return_type_different_qualifications) 10737 << New->getDeclName() << NewTy << OldTy; 10738 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10739 return true; 10740 }; 10741 10742 10743 // The new class type must have the same or less qualifiers as the old type. 10744 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10745 Diag(New->getLocation(), 10746 diag::err_covariant_return_type_class_type_more_qualified) 10747 << New->getDeclName() << NewTy << OldTy; 10748 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10749 return true; 10750 }; 10751 10752 return false; 10753} 10754 10755/// \brief Mark the given method pure. 10756/// 10757/// \param Method the method to be marked pure. 10758/// 10759/// \param InitRange the source range that covers the "0" initializer. 10760bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10761 SourceLocation EndLoc = InitRange.getEnd(); 10762 if (EndLoc.isValid()) 10763 Method->setRangeEnd(EndLoc); 10764 10765 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10766 Method->setPure(); 10767 return false; 10768 } 10769 10770 if (!Method->isInvalidDecl()) 10771 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10772 << Method->getDeclName() << InitRange; 10773 return true; 10774} 10775 10776/// \brief Determine whether the given declaration is a static data member. 10777static bool isStaticDataMember(Decl *D) { 10778 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10779 if (!Var) 10780 return false; 10781 10782 return Var->isStaticDataMember(); 10783} 10784/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10785/// an initializer for the out-of-line declaration 'Dcl'. The scope 10786/// is a fresh scope pushed for just this purpose. 10787/// 10788/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10789/// static data member of class X, names should be looked up in the scope of 10790/// class X. 10791void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10792 // If there is no declaration, there was an error parsing it. 10793 if (D == 0 || D->isInvalidDecl()) return; 10794 10795 // We should only get called for declarations with scope specifiers, like: 10796 // int foo::bar; 10797 assert(D->isOutOfLine()); 10798 EnterDeclaratorContext(S, D->getDeclContext()); 10799 10800 // If we are parsing the initializer for a static data member, push a 10801 // new expression evaluation context that is associated with this static 10802 // data member. 10803 if (isStaticDataMember(D)) 10804 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10805} 10806 10807/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10808/// initializer for the out-of-line declaration 'D'. 10809void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10810 // If there is no declaration, there was an error parsing it. 10811 if (D == 0 || D->isInvalidDecl()) return; 10812 10813 if (isStaticDataMember(D)) 10814 PopExpressionEvaluationContext(); 10815 10816 assert(D->isOutOfLine()); 10817 ExitDeclaratorContext(S); 10818} 10819 10820/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10821/// C++ if/switch/while/for statement. 10822/// e.g: "if (int x = f()) {...}" 10823DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10824 // C++ 6.4p2: 10825 // The declarator shall not specify a function or an array. 10826 // The type-specifier-seq shall not contain typedef and shall not declare a 10827 // new class or enumeration. 10828 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10829 "Parser allowed 'typedef' as storage class of condition decl."); 10830 10831 Decl *Dcl = ActOnDeclarator(S, D); 10832 if (!Dcl) 10833 return true; 10834 10835 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10836 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10837 << D.getSourceRange(); 10838 return true; 10839 } 10840 10841 return Dcl; 10842} 10843 10844void Sema::LoadExternalVTableUses() { 10845 if (!ExternalSource) 10846 return; 10847 10848 SmallVector<ExternalVTableUse, 4> VTables; 10849 ExternalSource->ReadUsedVTables(VTables); 10850 SmallVector<VTableUse, 4> NewUses; 10851 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10852 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10853 = VTablesUsed.find(VTables[I].Record); 10854 // Even if a definition wasn't required before, it may be required now. 10855 if (Pos != VTablesUsed.end()) { 10856 if (!Pos->second && VTables[I].DefinitionRequired) 10857 Pos->second = true; 10858 continue; 10859 } 10860 10861 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10862 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10863 } 10864 10865 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10866} 10867 10868void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10869 bool DefinitionRequired) { 10870 // Ignore any vtable uses in unevaluated operands or for classes that do 10871 // not have a vtable. 10872 if (!Class->isDynamicClass() || Class->isDependentContext() || 10873 CurContext->isDependentContext() || 10874 ExprEvalContexts.back().Context == Unevaluated) 10875 return; 10876 10877 // Try to insert this class into the map. 10878 LoadExternalVTableUses(); 10879 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10880 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10881 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10882 if (!Pos.second) { 10883 // If we already had an entry, check to see if we are promoting this vtable 10884 // to required a definition. If so, we need to reappend to the VTableUses 10885 // list, since we may have already processed the first entry. 10886 if (DefinitionRequired && !Pos.first->second) { 10887 Pos.first->second = true; 10888 } else { 10889 // Otherwise, we can early exit. 10890 return; 10891 } 10892 } 10893 10894 // Local classes need to have their virtual members marked 10895 // immediately. For all other classes, we mark their virtual members 10896 // at the end of the translation unit. 10897 if (Class->isLocalClass()) 10898 MarkVirtualMembersReferenced(Loc, Class); 10899 else 10900 VTableUses.push_back(std::make_pair(Class, Loc)); 10901} 10902 10903bool Sema::DefineUsedVTables() { 10904 LoadExternalVTableUses(); 10905 if (VTableUses.empty()) 10906 return false; 10907 10908 // Note: The VTableUses vector could grow as a result of marking 10909 // the members of a class as "used", so we check the size each 10910 // time through the loop and prefer indices (which are stable) to 10911 // iterators (which are not). 10912 bool DefinedAnything = false; 10913 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10914 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10915 if (!Class) 10916 continue; 10917 10918 SourceLocation Loc = VTableUses[I].second; 10919 10920 bool DefineVTable = true; 10921 10922 // If this class has a key function, but that key function is 10923 // defined in another translation unit, we don't need to emit the 10924 // vtable even though we're using it. 10925 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10926 if (KeyFunction && !KeyFunction->hasBody()) { 10927 switch (KeyFunction->getTemplateSpecializationKind()) { 10928 case TSK_Undeclared: 10929 case TSK_ExplicitSpecialization: 10930 case TSK_ExplicitInstantiationDeclaration: 10931 // The key function is in another translation unit. 10932 DefineVTable = false; 10933 break; 10934 10935 case TSK_ExplicitInstantiationDefinition: 10936 case TSK_ImplicitInstantiation: 10937 // We will be instantiating the key function. 10938 break; 10939 } 10940 } else if (!KeyFunction) { 10941 // If we have a class with no key function that is the subject 10942 // of an explicit instantiation declaration, suppress the 10943 // vtable; it will live with the explicit instantiation 10944 // definition. 10945 bool IsExplicitInstantiationDeclaration 10946 = Class->getTemplateSpecializationKind() 10947 == TSK_ExplicitInstantiationDeclaration; 10948 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10949 REnd = Class->redecls_end(); 10950 R != REnd; ++R) { 10951 TemplateSpecializationKind TSK 10952 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10953 if (TSK == TSK_ExplicitInstantiationDeclaration) 10954 IsExplicitInstantiationDeclaration = true; 10955 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10956 IsExplicitInstantiationDeclaration = false; 10957 break; 10958 } 10959 } 10960 10961 if (IsExplicitInstantiationDeclaration) 10962 DefineVTable = false; 10963 } 10964 10965 // The exception specifications for all virtual members may be needed even 10966 // if we are not providing an authoritative form of the vtable in this TU. 10967 // We may choose to emit it available_externally anyway. 10968 if (!DefineVTable) { 10969 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 10970 continue; 10971 } 10972 10973 // Mark all of the virtual members of this class as referenced, so 10974 // that we can build a vtable. Then, tell the AST consumer that a 10975 // vtable for this class is required. 10976 DefinedAnything = true; 10977 MarkVirtualMembersReferenced(Loc, Class); 10978 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10979 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10980 10981 // Optionally warn if we're emitting a weak vtable. 10982 if (Class->getLinkage() == ExternalLinkage && 10983 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10984 const FunctionDecl *KeyFunctionDef = 0; 10985 if (!KeyFunction || 10986 (KeyFunction->hasBody(KeyFunctionDef) && 10987 KeyFunctionDef->isInlined())) 10988 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10989 TSK_ExplicitInstantiationDefinition 10990 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10991 << Class; 10992 } 10993 } 10994 VTableUses.clear(); 10995 10996 return DefinedAnything; 10997} 10998 10999void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 11000 const CXXRecordDecl *RD) { 11001 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 11002 E = RD->method_end(); I != E; ++I) 11003 if ((*I)->isVirtual() && !(*I)->isPure()) 11004 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 11005} 11006 11007void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 11008 const CXXRecordDecl *RD) { 11009 // Mark all functions which will appear in RD's vtable as used. 11010 CXXFinalOverriderMap FinalOverriders; 11011 RD->getFinalOverriders(FinalOverriders); 11012 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 11013 E = FinalOverriders.end(); 11014 I != E; ++I) { 11015 for (OverridingMethods::const_iterator OI = I->second.begin(), 11016 OE = I->second.end(); 11017 OI != OE; ++OI) { 11018 assert(OI->second.size() > 0 && "no final overrider"); 11019 CXXMethodDecl *Overrider = OI->second.front().Method; 11020 11021 // C++ [basic.def.odr]p2: 11022 // [...] A virtual member function is used if it is not pure. [...] 11023 if (!Overrider->isPure()) 11024 MarkFunctionReferenced(Loc, Overrider); 11025 } 11026 } 11027 11028 // Only classes that have virtual bases need a VTT. 11029 if (RD->getNumVBases() == 0) 11030 return; 11031 11032 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 11033 e = RD->bases_end(); i != e; ++i) { 11034 const CXXRecordDecl *Base = 11035 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 11036 if (Base->getNumVBases() == 0) 11037 continue; 11038 MarkVirtualMembersReferenced(Loc, Base); 11039 } 11040} 11041 11042/// SetIvarInitializers - This routine builds initialization ASTs for the 11043/// Objective-C implementation whose ivars need be initialized. 11044void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 11045 if (!getLangOpts().CPlusPlus) 11046 return; 11047 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 11048 SmallVector<ObjCIvarDecl*, 8> ivars; 11049 CollectIvarsToConstructOrDestruct(OID, ivars); 11050 if (ivars.empty()) 11051 return; 11052 SmallVector<CXXCtorInitializer*, 32> AllToInit; 11053 for (unsigned i = 0; i < ivars.size(); i++) { 11054 FieldDecl *Field = ivars[i]; 11055 if (Field->isInvalidDecl()) 11056 continue; 11057 11058 CXXCtorInitializer *Member; 11059 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 11060 InitializationKind InitKind = 11061 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 11062 11063 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 11064 ExprResult MemberInit = 11065 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 11066 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 11067 // Note, MemberInit could actually come back empty if no initialization 11068 // is required (e.g., because it would call a trivial default constructor) 11069 if (!MemberInit.get() || MemberInit.isInvalid()) 11070 continue; 11071 11072 Member = 11073 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 11074 SourceLocation(), 11075 MemberInit.takeAs<Expr>(), 11076 SourceLocation()); 11077 AllToInit.push_back(Member); 11078 11079 // Be sure that the destructor is accessible and is marked as referenced. 11080 if (const RecordType *RecordTy 11081 = Context.getBaseElementType(Field->getType()) 11082 ->getAs<RecordType>()) { 11083 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 11084 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 11085 MarkFunctionReferenced(Field->getLocation(), Destructor); 11086 CheckDestructorAccess(Field->getLocation(), Destructor, 11087 PDiag(diag::err_access_dtor_ivar) 11088 << Context.getBaseElementType(Field->getType())); 11089 } 11090 } 11091 } 11092 ObjCImplementation->setIvarInitializers(Context, 11093 AllToInit.data(), AllToInit.size()); 11094 } 11095} 11096 11097static 11098void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 11099 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 11100 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 11101 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 11102 Sema &S) { 11103 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11104 CE = Current.end(); 11105 if (Ctor->isInvalidDecl()) 11106 return; 11107 11108 CXXConstructorDecl *Target = Ctor->getTargetConstructor(); 11109 11110 // Target may not be determinable yet, for instance if this is a dependent 11111 // call in an uninstantiated template. 11112 if (Target) { 11113 const FunctionDecl *FNTarget = 0; 11114 (void)Target->hasBody(FNTarget); 11115 Target = const_cast<CXXConstructorDecl*>( 11116 cast_or_null<CXXConstructorDecl>(FNTarget)); 11117 } 11118 11119 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 11120 // Avoid dereferencing a null pointer here. 11121 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 11122 11123 if (!Current.insert(Canonical)) 11124 return; 11125 11126 // We know that beyond here, we aren't chaining into a cycle. 11127 if (!Target || !Target->isDelegatingConstructor() || 11128 Target->isInvalidDecl() || Valid.count(TCanonical)) { 11129 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11130 Valid.insert(*CI); 11131 Current.clear(); 11132 // We've hit a cycle. 11133 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 11134 Current.count(TCanonical)) { 11135 // If we haven't diagnosed this cycle yet, do so now. 11136 if (!Invalid.count(TCanonical)) { 11137 S.Diag((*Ctor->init_begin())->getSourceLocation(), 11138 diag::warn_delegating_ctor_cycle) 11139 << Ctor; 11140 11141 // Don't add a note for a function delegating directly to itself. 11142 if (TCanonical != Canonical) 11143 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11144 11145 CXXConstructorDecl *C = Target; 11146 while (C->getCanonicalDecl() != Canonical) { 11147 const FunctionDecl *FNTarget = 0; 11148 (void)C->getTargetConstructor()->hasBody(FNTarget); 11149 assert(FNTarget && "Ctor cycle through bodiless function"); 11150 11151 C = const_cast<CXXConstructorDecl*>( 11152 cast<CXXConstructorDecl>(FNTarget)); 11153 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11154 } 11155 } 11156 11157 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11158 Invalid.insert(*CI); 11159 Current.clear(); 11160 } else { 11161 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11162 } 11163} 11164 11165 11166void Sema::CheckDelegatingCtorCycles() { 11167 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11168 11169 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11170 CE = Current.end(); 11171 11172 for (DelegatingCtorDeclsType::iterator 11173 I = DelegatingCtorDecls.begin(ExternalSource), 11174 E = DelegatingCtorDecls.end(); 11175 I != E; ++I) 11176 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11177 11178 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11179 (*CI)->setInvalidDecl(); 11180} 11181 11182namespace { 11183 /// \brief AST visitor that finds references to the 'this' expression. 11184 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 11185 Sema &S; 11186 11187 public: 11188 explicit FindCXXThisExpr(Sema &S) : S(S) { } 11189 11190 bool VisitCXXThisExpr(CXXThisExpr *E) { 11191 S.Diag(E->getLocation(), diag::err_this_static_member_func) 11192 << E->isImplicit(); 11193 return false; 11194 } 11195 }; 11196} 11197 11198bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 11199 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11200 if (!TSInfo) 11201 return false; 11202 11203 TypeLoc TL = TSInfo->getTypeLoc(); 11204 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11205 if (!ProtoTL) 11206 return false; 11207 11208 // C++11 [expr.prim.general]p3: 11209 // [The expression this] shall not appear before the optional 11210 // cv-qualifier-seq and it shall not appear within the declaration of a 11211 // static member function (although its type and value category are defined 11212 // within a static member function as they are within a non-static member 11213 // function). [ Note: this is because declaration matching does not occur 11214 // until the complete declarator is known. - end note ] 11215 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11216 FindCXXThisExpr Finder(*this); 11217 11218 // If the return type came after the cv-qualifier-seq, check it now. 11219 if (Proto->hasTrailingReturn() && 11220 !Finder.TraverseTypeLoc(ProtoTL->getResultLoc())) 11221 return true; 11222 11223 // Check the exception specification. 11224 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 11225 return true; 11226 11227 return checkThisInStaticMemberFunctionAttributes(Method); 11228} 11229 11230bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 11231 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11232 if (!TSInfo) 11233 return false; 11234 11235 TypeLoc TL = TSInfo->getTypeLoc(); 11236 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11237 if (!ProtoTL) 11238 return false; 11239 11240 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11241 FindCXXThisExpr Finder(*this); 11242 11243 switch (Proto->getExceptionSpecType()) { 11244 case EST_Uninstantiated: 11245 case EST_Unevaluated: 11246 case EST_BasicNoexcept: 11247 case EST_DynamicNone: 11248 case EST_MSAny: 11249 case EST_None: 11250 break; 11251 11252 case EST_ComputedNoexcept: 11253 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11254 return true; 11255 11256 case EST_Dynamic: 11257 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11258 EEnd = Proto->exception_end(); 11259 E != EEnd; ++E) { 11260 if (!Finder.TraverseType(*E)) 11261 return true; 11262 } 11263 break; 11264 } 11265 11266 return false; 11267} 11268 11269bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11270 FindCXXThisExpr Finder(*this); 11271 11272 // Check attributes. 11273 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11274 A != AEnd; ++A) { 11275 // FIXME: This should be emitted by tblgen. 11276 Expr *Arg = 0; 11277 ArrayRef<Expr *> Args; 11278 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11279 Arg = G->getArg(); 11280 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11281 Arg = G->getArg(); 11282 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11283 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11284 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11285 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11286 else if (ExclusiveLockFunctionAttr *ELF 11287 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11288 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11289 else if (SharedLockFunctionAttr *SLF 11290 = dyn_cast<SharedLockFunctionAttr>(*A)) 11291 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11292 else if (ExclusiveTrylockFunctionAttr *ETLF 11293 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11294 Arg = ETLF->getSuccessValue(); 11295 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11296 } else if (SharedTrylockFunctionAttr *STLF 11297 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11298 Arg = STLF->getSuccessValue(); 11299 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11300 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11301 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11302 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11303 Arg = LR->getArg(); 11304 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11305 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11306 else if (ExclusiveLocksRequiredAttr *ELR 11307 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11308 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11309 else if (SharedLocksRequiredAttr *SLR 11310 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11311 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11312 11313 if (Arg && !Finder.TraverseStmt(Arg)) 11314 return true; 11315 11316 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11317 if (!Finder.TraverseStmt(Args[I])) 11318 return true; 11319 } 11320 } 11321 11322 return false; 11323} 11324 11325void 11326Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 11327 ArrayRef<ParsedType> DynamicExceptions, 11328 ArrayRef<SourceRange> DynamicExceptionRanges, 11329 Expr *NoexceptExpr, 11330 llvm::SmallVectorImpl<QualType> &Exceptions, 11331 FunctionProtoType::ExtProtoInfo &EPI) { 11332 Exceptions.clear(); 11333 EPI.ExceptionSpecType = EST; 11334 if (EST == EST_Dynamic) { 11335 Exceptions.reserve(DynamicExceptions.size()); 11336 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 11337 // FIXME: Preserve type source info. 11338 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 11339 11340 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 11341 collectUnexpandedParameterPacks(ET, Unexpanded); 11342 if (!Unexpanded.empty()) { 11343 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 11344 UPPC_ExceptionType, 11345 Unexpanded); 11346 continue; 11347 } 11348 11349 // Check that the type is valid for an exception spec, and 11350 // drop it if not. 11351 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 11352 Exceptions.push_back(ET); 11353 } 11354 EPI.NumExceptions = Exceptions.size(); 11355 EPI.Exceptions = Exceptions.data(); 11356 return; 11357 } 11358 11359 if (EST == EST_ComputedNoexcept) { 11360 // If an error occurred, there's no expression here. 11361 if (NoexceptExpr) { 11362 assert((NoexceptExpr->isTypeDependent() || 11363 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 11364 Context.BoolTy) && 11365 "Parser should have made sure that the expression is boolean"); 11366 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 11367 EPI.ExceptionSpecType = EST_BasicNoexcept; 11368 return; 11369 } 11370 11371 if (!NoexceptExpr->isValueDependent()) 11372 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 11373 diag::err_noexcept_needs_constant_expression, 11374 /*AllowFold*/ false).take(); 11375 EPI.NoexceptExpr = NoexceptExpr; 11376 } 11377 return; 11378 } 11379} 11380 11381/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11382Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11383 // Implicitly declared functions (e.g. copy constructors) are 11384 // __host__ __device__ 11385 if (D->isImplicit()) 11386 return CFT_HostDevice; 11387 11388 if (D->hasAttr<CUDAGlobalAttr>()) 11389 return CFT_Global; 11390 11391 if (D->hasAttr<CUDADeviceAttr>()) { 11392 if (D->hasAttr<CUDAHostAttr>()) 11393 return CFT_HostDevice; 11394 else 11395 return CFT_Device; 11396 } 11397 11398 return CFT_Host; 11399} 11400 11401bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11402 CUDAFunctionTarget CalleeTarget) { 11403 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11404 // Callable from the device only." 11405 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11406 return true; 11407 11408 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11409 // Callable from the host only." 11410 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11411 // Callable from the host only." 11412 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11413 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11414 return true; 11415 11416 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11417 return true; 11418 11419 return false; 11420} 11421