SemaDeclCXX.cpp revision 54b3ba8cf2eb4886a88cdb8adedb15f43333ff1d
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "clang/AST/ASTConsumer.h" 21#include "clang/AST/ASTContext.h" 22#include "clang/AST/ASTMutationListener.h" 23#include "clang/AST/CharUnits.h" 24#include "clang/AST/CXXInheritance.h" 25#include "clang/AST/DeclVisitor.h" 26#include "clang/AST/EvaluatedExprVisitor.h" 27#include "clang/AST/ExprCXX.h" 28#include "clang/AST/RecordLayout.h" 29#include "clang/AST/RecursiveASTVisitor.h" 30#include "clang/AST/StmtVisitor.h" 31#include "clang/AST/TypeLoc.h" 32#include "clang/AST/TypeOrdering.h" 33#include "clang/Sema/DeclSpec.h" 34#include "clang/Sema/ParsedTemplate.h" 35#include "clang/Basic/PartialDiagnostic.h" 36#include "clang/Lex/Preprocessor.h" 37#include "llvm/ADT/SmallString.h" 38#include "llvm/ADT/STLExtras.h" 39#include <map> 40#include <set> 41 42using namespace clang; 43 44//===----------------------------------------------------------------------===// 45// CheckDefaultArgumentVisitor 46//===----------------------------------------------------------------------===// 47 48namespace { 49 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 50 /// the default argument of a parameter to determine whether it 51 /// contains any ill-formed subexpressions. For example, this will 52 /// diagnose the use of local variables or parameters within the 53 /// default argument expression. 54 class CheckDefaultArgumentVisitor 55 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 56 Expr *DefaultArg; 57 Sema *S; 58 59 public: 60 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 61 : DefaultArg(defarg), S(s) {} 62 63 bool VisitExpr(Expr *Node); 64 bool VisitDeclRefExpr(DeclRefExpr *DRE); 65 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 66 bool VisitLambdaExpr(LambdaExpr *Lambda); 67 }; 68 69 /// VisitExpr - Visit all of the children of this expression. 70 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 71 bool IsInvalid = false; 72 for (Stmt::child_range I = Node->children(); I; ++I) 73 IsInvalid |= Visit(*I); 74 return IsInvalid; 75 } 76 77 /// VisitDeclRefExpr - Visit a reference to a declaration, to 78 /// determine whether this declaration can be used in the default 79 /// argument expression. 80 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 81 NamedDecl *Decl = DRE->getDecl(); 82 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 83 // C++ [dcl.fct.default]p9 84 // Default arguments are evaluated each time the function is 85 // called. The order of evaluation of function arguments is 86 // unspecified. Consequently, parameters of a function shall not 87 // be used in default argument expressions, even if they are not 88 // evaluated. Parameters of a function declared before a default 89 // argument expression are in scope and can hide namespace and 90 // class member names. 91 return S->Diag(DRE->getLocStart(), 92 diag::err_param_default_argument_references_param) 93 << Param->getDeclName() << DefaultArg->getSourceRange(); 94 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 95 // C++ [dcl.fct.default]p7 96 // Local variables shall not be used in default argument 97 // expressions. 98 if (VDecl->isLocalVarDecl()) 99 return S->Diag(DRE->getLocStart(), 100 diag::err_param_default_argument_references_local) 101 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 102 } 103 104 return false; 105 } 106 107 /// VisitCXXThisExpr - Visit a C++ "this" expression. 108 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 109 // C++ [dcl.fct.default]p8: 110 // The keyword this shall not be used in a default argument of a 111 // member function. 112 return S->Diag(ThisE->getLocStart(), 113 diag::err_param_default_argument_references_this) 114 << ThisE->getSourceRange(); 115 } 116 117 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 118 // C++11 [expr.lambda.prim]p13: 119 // A lambda-expression appearing in a default argument shall not 120 // implicitly or explicitly capture any entity. 121 if (Lambda->capture_begin() == Lambda->capture_end()) 122 return false; 123 124 return S->Diag(Lambda->getLocStart(), 125 diag::err_lambda_capture_default_arg); 126 } 127} 128 129void Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, 130 CXXMethodDecl *Method) { 131 // If we have an MSAny spec already, don't bother. 132 if (!Method || ComputedEST == EST_MSAny) 133 return; 134 135 const FunctionProtoType *Proto 136 = Method->getType()->getAs<FunctionProtoType>(); 137 Proto = Self->ResolveExceptionSpec(CallLoc, Proto); 138 if (!Proto) 139 return; 140 141 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 142 143 // If this function can throw any exceptions, make a note of that. 144 if (EST == EST_MSAny || EST == EST_None) { 145 ClearExceptions(); 146 ComputedEST = EST; 147 return; 148 } 149 150 // FIXME: If the call to this decl is using any of its default arguments, we 151 // need to search them for potentially-throwing calls. 152 153 // If this function has a basic noexcept, it doesn't affect the outcome. 154 if (EST == EST_BasicNoexcept) 155 return; 156 157 // If we have a throw-all spec at this point, ignore the function. 158 if (ComputedEST == EST_None) 159 return; 160 161 // If we're still at noexcept(true) and there's a nothrow() callee, 162 // change to that specification. 163 if (EST == EST_DynamicNone) { 164 if (ComputedEST == EST_BasicNoexcept) 165 ComputedEST = EST_DynamicNone; 166 return; 167 } 168 169 // Check out noexcept specs. 170 if (EST == EST_ComputedNoexcept) { 171 FunctionProtoType::NoexceptResult NR = 172 Proto->getNoexceptSpec(Self->Context); 173 assert(NR != FunctionProtoType::NR_NoNoexcept && 174 "Must have noexcept result for EST_ComputedNoexcept."); 175 assert(NR != FunctionProtoType::NR_Dependent && 176 "Should not generate implicit declarations for dependent cases, " 177 "and don't know how to handle them anyway."); 178 179 // noexcept(false) -> no spec on the new function 180 if (NR == FunctionProtoType::NR_Throw) { 181 ClearExceptions(); 182 ComputedEST = EST_None; 183 } 184 // noexcept(true) won't change anything either. 185 return; 186 } 187 188 assert(EST == EST_Dynamic && "EST case not considered earlier."); 189 assert(ComputedEST != EST_None && 190 "Shouldn't collect exceptions when throw-all is guaranteed."); 191 ComputedEST = EST_Dynamic; 192 // Record the exceptions in this function's exception specification. 193 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 194 EEnd = Proto->exception_end(); 195 E != EEnd; ++E) 196 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E))) 197 Exceptions.push_back(*E); 198} 199 200void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 201 if (!E || ComputedEST == EST_MSAny) 202 return; 203 204 // FIXME: 205 // 206 // C++0x [except.spec]p14: 207 // [An] implicit exception-specification specifies the type-id T if and 208 // only if T is allowed by the exception-specification of a function directly 209 // invoked by f's implicit definition; f shall allow all exceptions if any 210 // function it directly invokes allows all exceptions, and f shall allow no 211 // exceptions if every function it directly invokes allows no exceptions. 212 // 213 // Note in particular that if an implicit exception-specification is generated 214 // for a function containing a throw-expression, that specification can still 215 // be noexcept(true). 216 // 217 // Note also that 'directly invoked' is not defined in the standard, and there 218 // is no indication that we should only consider potentially-evaluated calls. 219 // 220 // Ultimately we should implement the intent of the standard: the exception 221 // specification should be the set of exceptions which can be thrown by the 222 // implicit definition. For now, we assume that any non-nothrow expression can 223 // throw any exception. 224 225 if (Self->canThrow(E)) 226 ComputedEST = EST_None; 227} 228 229bool 230Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 231 SourceLocation EqualLoc) { 232 if (RequireCompleteType(Param->getLocation(), Param->getType(), 233 diag::err_typecheck_decl_incomplete_type)) { 234 Param->setInvalidDecl(); 235 return true; 236 } 237 238 // C++ [dcl.fct.default]p5 239 // A default argument expression is implicitly converted (clause 240 // 4) to the parameter type. The default argument expression has 241 // the same semantic constraints as the initializer expression in 242 // a declaration of a variable of the parameter type, using the 243 // copy-initialization semantics (8.5). 244 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 245 Param); 246 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 247 EqualLoc); 248 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 249 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg); 250 if (Result.isInvalid()) 251 return true; 252 Arg = Result.takeAs<Expr>(); 253 254 CheckImplicitConversions(Arg, EqualLoc); 255 Arg = MaybeCreateExprWithCleanups(Arg); 256 257 // Okay: add the default argument to the parameter 258 Param->setDefaultArg(Arg); 259 260 // We have already instantiated this parameter; provide each of the 261 // instantiations with the uninstantiated default argument. 262 UnparsedDefaultArgInstantiationsMap::iterator InstPos 263 = UnparsedDefaultArgInstantiations.find(Param); 264 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 265 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 266 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 267 268 // We're done tracking this parameter's instantiations. 269 UnparsedDefaultArgInstantiations.erase(InstPos); 270 } 271 272 return false; 273} 274 275/// ActOnParamDefaultArgument - Check whether the default argument 276/// provided for a function parameter is well-formed. If so, attach it 277/// to the parameter declaration. 278void 279Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 280 Expr *DefaultArg) { 281 if (!param || !DefaultArg) 282 return; 283 284 ParmVarDecl *Param = cast<ParmVarDecl>(param); 285 UnparsedDefaultArgLocs.erase(Param); 286 287 // Default arguments are only permitted in C++ 288 if (!getLangOpts().CPlusPlus) { 289 Diag(EqualLoc, diag::err_param_default_argument) 290 << DefaultArg->getSourceRange(); 291 Param->setInvalidDecl(); 292 return; 293 } 294 295 // Check for unexpanded parameter packs. 296 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 297 Param->setInvalidDecl(); 298 return; 299 } 300 301 // Check that the default argument is well-formed 302 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 303 if (DefaultArgChecker.Visit(DefaultArg)) { 304 Param->setInvalidDecl(); 305 return; 306 } 307 308 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 309} 310 311/// ActOnParamUnparsedDefaultArgument - We've seen a default 312/// argument for a function parameter, but we can't parse it yet 313/// because we're inside a class definition. Note that this default 314/// argument will be parsed later. 315void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 316 SourceLocation EqualLoc, 317 SourceLocation ArgLoc) { 318 if (!param) 319 return; 320 321 ParmVarDecl *Param = cast<ParmVarDecl>(param); 322 if (Param) 323 Param->setUnparsedDefaultArg(); 324 325 UnparsedDefaultArgLocs[Param] = ArgLoc; 326} 327 328/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 329/// the default argument for the parameter param failed. 330void Sema::ActOnParamDefaultArgumentError(Decl *param) { 331 if (!param) 332 return; 333 334 ParmVarDecl *Param = cast<ParmVarDecl>(param); 335 336 Param->setInvalidDecl(); 337 338 UnparsedDefaultArgLocs.erase(Param); 339} 340 341/// CheckExtraCXXDefaultArguments - Check for any extra default 342/// arguments in the declarator, which is not a function declaration 343/// or definition and therefore is not permitted to have default 344/// arguments. This routine should be invoked for every declarator 345/// that is not a function declaration or definition. 346void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 347 // C++ [dcl.fct.default]p3 348 // A default argument expression shall be specified only in the 349 // parameter-declaration-clause of a function declaration or in a 350 // template-parameter (14.1). It shall not be specified for a 351 // parameter pack. If it is specified in a 352 // parameter-declaration-clause, it shall not occur within a 353 // declarator or abstract-declarator of a parameter-declaration. 354 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 355 DeclaratorChunk &chunk = D.getTypeObject(i); 356 if (chunk.Kind == DeclaratorChunk::Function) { 357 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 358 ParmVarDecl *Param = 359 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 360 if (Param->hasUnparsedDefaultArg()) { 361 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 362 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 363 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 364 delete Toks; 365 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 366 } else if (Param->getDefaultArg()) { 367 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 368 << Param->getDefaultArg()->getSourceRange(); 369 Param->setDefaultArg(0); 370 } 371 } 372 } 373 } 374} 375 376/// MergeCXXFunctionDecl - Merge two declarations of the same C++ 377/// function, once we already know that they have the same 378/// type. Subroutine of MergeFunctionDecl. Returns true if there was an 379/// error, false otherwise. 380bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, 381 Scope *S) { 382 bool Invalid = false; 383 384 // C++ [dcl.fct.default]p4: 385 // For non-template functions, default arguments can be added in 386 // later declarations of a function in the same 387 // scope. Declarations in different scopes have completely 388 // distinct sets of default arguments. That is, declarations in 389 // inner scopes do not acquire default arguments from 390 // declarations in outer scopes, and vice versa. In a given 391 // function declaration, all parameters subsequent to a 392 // parameter with a default argument shall have default 393 // arguments supplied in this or previous declarations. A 394 // default argument shall not be redefined by a later 395 // declaration (not even to the same value). 396 // 397 // C++ [dcl.fct.default]p6: 398 // Except for member functions of class templates, the default arguments 399 // in a member function definition that appears outside of the class 400 // definition are added to the set of default arguments provided by the 401 // member function declaration in the class definition. 402 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 403 ParmVarDecl *OldParam = Old->getParamDecl(p); 404 ParmVarDecl *NewParam = New->getParamDecl(p); 405 406 bool OldParamHasDfl = OldParam->hasDefaultArg(); 407 bool NewParamHasDfl = NewParam->hasDefaultArg(); 408 409 NamedDecl *ND = Old; 410 if (S && !isDeclInScope(ND, New->getDeclContext(), S)) 411 // Ignore default parameters of old decl if they are not in 412 // the same scope. 413 OldParamHasDfl = false; 414 415 if (OldParamHasDfl && NewParamHasDfl) { 416 417 unsigned DiagDefaultParamID = 418 diag::err_param_default_argument_redefinition; 419 420 // MSVC accepts that default parameters be redefined for member functions 421 // of template class. The new default parameter's value is ignored. 422 Invalid = true; 423 if (getLangOpts().MicrosoftExt) { 424 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 425 if (MD && MD->getParent()->getDescribedClassTemplate()) { 426 // Merge the old default argument into the new parameter. 427 NewParam->setHasInheritedDefaultArg(); 428 if (OldParam->hasUninstantiatedDefaultArg()) 429 NewParam->setUninstantiatedDefaultArg( 430 OldParam->getUninstantiatedDefaultArg()); 431 else 432 NewParam->setDefaultArg(OldParam->getInit()); 433 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 434 Invalid = false; 435 } 436 } 437 438 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 439 // hint here. Alternatively, we could walk the type-source information 440 // for NewParam to find the last source location in the type... but it 441 // isn't worth the effort right now. This is the kind of test case that 442 // is hard to get right: 443 // int f(int); 444 // void g(int (*fp)(int) = f); 445 // void g(int (*fp)(int) = &f); 446 Diag(NewParam->getLocation(), DiagDefaultParamID) 447 << NewParam->getDefaultArgRange(); 448 449 // Look for the function declaration where the default argument was 450 // actually written, which may be a declaration prior to Old. 451 for (FunctionDecl *Older = Old->getPreviousDecl(); 452 Older; Older = Older->getPreviousDecl()) { 453 if (!Older->getParamDecl(p)->hasDefaultArg()) 454 break; 455 456 OldParam = Older->getParamDecl(p); 457 } 458 459 Diag(OldParam->getLocation(), diag::note_previous_definition) 460 << OldParam->getDefaultArgRange(); 461 } else if (OldParamHasDfl) { 462 // Merge the old default argument into the new parameter. 463 // It's important to use getInit() here; getDefaultArg() 464 // strips off any top-level ExprWithCleanups. 465 NewParam->setHasInheritedDefaultArg(); 466 if (OldParam->hasUninstantiatedDefaultArg()) 467 NewParam->setUninstantiatedDefaultArg( 468 OldParam->getUninstantiatedDefaultArg()); 469 else 470 NewParam->setDefaultArg(OldParam->getInit()); 471 } else if (NewParamHasDfl) { 472 if (New->getDescribedFunctionTemplate()) { 473 // Paragraph 4, quoted above, only applies to non-template functions. 474 Diag(NewParam->getLocation(), 475 diag::err_param_default_argument_template_redecl) 476 << NewParam->getDefaultArgRange(); 477 Diag(Old->getLocation(), diag::note_template_prev_declaration) 478 << false; 479 } else if (New->getTemplateSpecializationKind() 480 != TSK_ImplicitInstantiation && 481 New->getTemplateSpecializationKind() != TSK_Undeclared) { 482 // C++ [temp.expr.spec]p21: 483 // Default function arguments shall not be specified in a declaration 484 // or a definition for one of the following explicit specializations: 485 // - the explicit specialization of a function template; 486 // - the explicit specialization of a member function template; 487 // - the explicit specialization of a member function of a class 488 // template where the class template specialization to which the 489 // member function specialization belongs is implicitly 490 // instantiated. 491 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 492 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 493 << New->getDeclName() 494 << NewParam->getDefaultArgRange(); 495 } else if (New->getDeclContext()->isDependentContext()) { 496 // C++ [dcl.fct.default]p6 (DR217): 497 // Default arguments for a member function of a class template shall 498 // be specified on the initial declaration of the member function 499 // within the class template. 500 // 501 // Reading the tea leaves a bit in DR217 and its reference to DR205 502 // leads me to the conclusion that one cannot add default function 503 // arguments for an out-of-line definition of a member function of a 504 // dependent type. 505 int WhichKind = 2; 506 if (CXXRecordDecl *Record 507 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 508 if (Record->getDescribedClassTemplate()) 509 WhichKind = 0; 510 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 511 WhichKind = 1; 512 else 513 WhichKind = 2; 514 } 515 516 Diag(NewParam->getLocation(), 517 diag::err_param_default_argument_member_template_redecl) 518 << WhichKind 519 << NewParam->getDefaultArgRange(); 520 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 521 CXXSpecialMember NewSM = getSpecialMember(Ctor), 522 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 523 if (NewSM != OldSM) { 524 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 525 << NewParam->getDefaultArgRange() << NewSM; 526 Diag(Old->getLocation(), diag::note_previous_declaration_special) 527 << OldSM; 528 } 529 } 530 } 531 } 532 533 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 534 // template has a constexpr specifier then all its declarations shall 535 // contain the constexpr specifier. 536 if (New->isConstexpr() != Old->isConstexpr()) { 537 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 538 << New << New->isConstexpr(); 539 Diag(Old->getLocation(), diag::note_previous_declaration); 540 Invalid = true; 541 } 542 543 if (CheckEquivalentExceptionSpec(Old, New)) 544 Invalid = true; 545 546 return Invalid; 547} 548 549/// \brief Merge the exception specifications of two variable declarations. 550/// 551/// This is called when there's a redeclaration of a VarDecl. The function 552/// checks if the redeclaration might have an exception specification and 553/// validates compatibility and merges the specs if necessary. 554void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 555 // Shortcut if exceptions are disabled. 556 if (!getLangOpts().CXXExceptions) 557 return; 558 559 assert(Context.hasSameType(New->getType(), Old->getType()) && 560 "Should only be called if types are otherwise the same."); 561 562 QualType NewType = New->getType(); 563 QualType OldType = Old->getType(); 564 565 // We're only interested in pointers and references to functions, as well 566 // as pointers to member functions. 567 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 568 NewType = R->getPointeeType(); 569 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 570 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 571 NewType = P->getPointeeType(); 572 OldType = OldType->getAs<PointerType>()->getPointeeType(); 573 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 574 NewType = M->getPointeeType(); 575 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 576 } 577 578 if (!NewType->isFunctionProtoType()) 579 return; 580 581 // There's lots of special cases for functions. For function pointers, system 582 // libraries are hopefully not as broken so that we don't need these 583 // workarounds. 584 if (CheckEquivalentExceptionSpec( 585 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 586 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 587 New->setInvalidDecl(); 588 } 589} 590 591/// CheckCXXDefaultArguments - Verify that the default arguments for a 592/// function declaration are well-formed according to C++ 593/// [dcl.fct.default]. 594void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 595 unsigned NumParams = FD->getNumParams(); 596 unsigned p; 597 598 bool IsLambda = FD->getOverloadedOperator() == OO_Call && 599 isa<CXXMethodDecl>(FD) && 600 cast<CXXMethodDecl>(FD)->getParent()->isLambda(); 601 602 // Find first parameter with a default argument 603 for (p = 0; p < NumParams; ++p) { 604 ParmVarDecl *Param = FD->getParamDecl(p); 605 if (Param->hasDefaultArg()) { 606 // C++11 [expr.prim.lambda]p5: 607 // [...] Default arguments (8.3.6) shall not be specified in the 608 // parameter-declaration-clause of a lambda-declarator. 609 // 610 // FIXME: Core issue 974 strikes this sentence, we only provide an 611 // extension warning. 612 if (IsLambda) 613 Diag(Param->getLocation(), diag::ext_lambda_default_arguments) 614 << Param->getDefaultArgRange(); 615 break; 616 } 617 } 618 619 // C++ [dcl.fct.default]p4: 620 // In a given function declaration, all parameters 621 // subsequent to a parameter with a default argument shall 622 // have default arguments supplied in this or previous 623 // declarations. A default argument shall not be redefined 624 // by a later declaration (not even to the same value). 625 unsigned LastMissingDefaultArg = 0; 626 for (; p < NumParams; ++p) { 627 ParmVarDecl *Param = FD->getParamDecl(p); 628 if (!Param->hasDefaultArg()) { 629 if (Param->isInvalidDecl()) 630 /* We already complained about this parameter. */; 631 else if (Param->getIdentifier()) 632 Diag(Param->getLocation(), 633 diag::err_param_default_argument_missing_name) 634 << Param->getIdentifier(); 635 else 636 Diag(Param->getLocation(), 637 diag::err_param_default_argument_missing); 638 639 LastMissingDefaultArg = p; 640 } 641 } 642 643 if (LastMissingDefaultArg > 0) { 644 // Some default arguments were missing. Clear out all of the 645 // default arguments up to (and including) the last missing 646 // default argument, so that we leave the function parameters 647 // in a semantically valid state. 648 for (p = 0; p <= LastMissingDefaultArg; ++p) { 649 ParmVarDecl *Param = FD->getParamDecl(p); 650 if (Param->hasDefaultArg()) { 651 Param->setDefaultArg(0); 652 } 653 } 654 } 655} 656 657// CheckConstexprParameterTypes - Check whether a function's parameter types 658// are all literal types. If so, return true. If not, produce a suitable 659// diagnostic and return false. 660static bool CheckConstexprParameterTypes(Sema &SemaRef, 661 const FunctionDecl *FD) { 662 unsigned ArgIndex = 0; 663 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 664 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 665 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 666 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 667 SourceLocation ParamLoc = PD->getLocation(); 668 if (!(*i)->isDependentType() && 669 SemaRef.RequireLiteralType(ParamLoc, *i, 670 diag::err_constexpr_non_literal_param, 671 ArgIndex+1, PD->getSourceRange(), 672 isa<CXXConstructorDecl>(FD))) 673 return false; 674 } 675 return true; 676} 677 678/// \brief Get diagnostic %select index for tag kind for 679/// record diagnostic message. 680/// WARNING: Indexes apply to particular diagnostics only! 681/// 682/// \returns diagnostic %select index. 683static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) { 684 switch (Tag) { 685 case TTK_Struct: return 0; 686 case TTK_Interface: return 1; 687 case TTK_Class: return 2; 688 default: llvm_unreachable("Invalid tag kind for record diagnostic!"); 689 } 690} 691 692// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 693// the requirements of a constexpr function definition or a constexpr 694// constructor definition. If so, return true. If not, produce appropriate 695// diagnostics and return false. 696// 697// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 698bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 699 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 700 if (MD && MD->isInstance()) { 701 // C++11 [dcl.constexpr]p4: 702 // The definition of a constexpr constructor shall satisfy the following 703 // constraints: 704 // - the class shall not have any virtual base classes; 705 const CXXRecordDecl *RD = MD->getParent(); 706 if (RD->getNumVBases()) { 707 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 708 << isa<CXXConstructorDecl>(NewFD) 709 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 710 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 711 E = RD->vbases_end(); I != E; ++I) 712 Diag(I->getLocStart(), 713 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 714 return false; 715 } 716 } 717 718 if (!isa<CXXConstructorDecl>(NewFD)) { 719 // C++11 [dcl.constexpr]p3: 720 // The definition of a constexpr function shall satisfy the following 721 // constraints: 722 // - it shall not be virtual; 723 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 724 if (Method && Method->isVirtual()) { 725 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 726 727 // If it's not obvious why this function is virtual, find an overridden 728 // function which uses the 'virtual' keyword. 729 const CXXMethodDecl *WrittenVirtual = Method; 730 while (!WrittenVirtual->isVirtualAsWritten()) 731 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 732 if (WrittenVirtual != Method) 733 Diag(WrittenVirtual->getLocation(), 734 diag::note_overridden_virtual_function); 735 return false; 736 } 737 738 // - its return type shall be a literal type; 739 QualType RT = NewFD->getResultType(); 740 if (!RT->isDependentType() && 741 RequireLiteralType(NewFD->getLocation(), RT, 742 diag::err_constexpr_non_literal_return)) 743 return false; 744 } 745 746 // - each of its parameter types shall be a literal type; 747 if (!CheckConstexprParameterTypes(*this, NewFD)) 748 return false; 749 750 return true; 751} 752 753/// Check the given declaration statement is legal within a constexpr function 754/// body. C++0x [dcl.constexpr]p3,p4. 755/// 756/// \return true if the body is OK, false if we have diagnosed a problem. 757static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 758 DeclStmt *DS) { 759 // C++0x [dcl.constexpr]p3 and p4: 760 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 761 // contain only 762 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 763 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 764 switch ((*DclIt)->getKind()) { 765 case Decl::StaticAssert: 766 case Decl::Using: 767 case Decl::UsingShadow: 768 case Decl::UsingDirective: 769 case Decl::UnresolvedUsingTypename: 770 // - static_assert-declarations 771 // - using-declarations, 772 // - using-directives, 773 continue; 774 775 case Decl::Typedef: 776 case Decl::TypeAlias: { 777 // - typedef declarations and alias-declarations that do not define 778 // classes or enumerations, 779 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 780 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 781 // Don't allow variably-modified types in constexpr functions. 782 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 783 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 784 << TL.getSourceRange() << TL.getType() 785 << isa<CXXConstructorDecl>(Dcl); 786 return false; 787 } 788 continue; 789 } 790 791 case Decl::Enum: 792 case Decl::CXXRecord: 793 // As an extension, we allow the declaration (but not the definition) of 794 // classes and enumerations in all declarations, not just in typedef and 795 // alias declarations. 796 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 797 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 798 << isa<CXXConstructorDecl>(Dcl); 799 return false; 800 } 801 continue; 802 803 case Decl::Var: 804 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 805 << isa<CXXConstructorDecl>(Dcl); 806 return false; 807 808 default: 809 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 810 << isa<CXXConstructorDecl>(Dcl); 811 return false; 812 } 813 } 814 815 return true; 816} 817 818/// Check that the given field is initialized within a constexpr constructor. 819/// 820/// \param Dcl The constexpr constructor being checked. 821/// \param Field The field being checked. This may be a member of an anonymous 822/// struct or union nested within the class being checked. 823/// \param Inits All declarations, including anonymous struct/union members and 824/// indirect members, for which any initialization was provided. 825/// \param Diagnosed Set to true if an error is produced. 826static void CheckConstexprCtorInitializer(Sema &SemaRef, 827 const FunctionDecl *Dcl, 828 FieldDecl *Field, 829 llvm::SmallSet<Decl*, 16> &Inits, 830 bool &Diagnosed) { 831 if (Field->isUnnamedBitfield()) 832 return; 833 834 if (Field->isAnonymousStructOrUnion() && 835 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 836 return; 837 838 if (!Inits.count(Field)) { 839 if (!Diagnosed) { 840 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 841 Diagnosed = true; 842 } 843 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 844 } else if (Field->isAnonymousStructOrUnion()) { 845 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 846 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 847 I != E; ++I) 848 // If an anonymous union contains an anonymous struct of which any member 849 // is initialized, all members must be initialized. 850 if (!RD->isUnion() || Inits.count(*I)) 851 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 852 } 853} 854 855/// Check the body for the given constexpr function declaration only contains 856/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 857/// 858/// \return true if the body is OK, false if we have diagnosed a problem. 859bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 860 if (isa<CXXTryStmt>(Body)) { 861 // C++11 [dcl.constexpr]p3: 862 // The definition of a constexpr function shall satisfy the following 863 // constraints: [...] 864 // - its function-body shall be = delete, = default, or a 865 // compound-statement 866 // 867 // C++11 [dcl.constexpr]p4: 868 // In the definition of a constexpr constructor, [...] 869 // - its function-body shall not be a function-try-block; 870 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 871 << isa<CXXConstructorDecl>(Dcl); 872 return false; 873 } 874 875 // - its function-body shall be [...] a compound-statement that contains only 876 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 877 878 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 879 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 880 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 881 switch ((*BodyIt)->getStmtClass()) { 882 case Stmt::NullStmtClass: 883 // - null statements, 884 continue; 885 886 case Stmt::DeclStmtClass: 887 // - static_assert-declarations 888 // - using-declarations, 889 // - using-directives, 890 // - typedef declarations and alias-declarations that do not define 891 // classes or enumerations, 892 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 893 return false; 894 continue; 895 896 case Stmt::ReturnStmtClass: 897 // - and exactly one return statement; 898 if (isa<CXXConstructorDecl>(Dcl)) 899 break; 900 901 ReturnStmts.push_back((*BodyIt)->getLocStart()); 902 continue; 903 904 default: 905 break; 906 } 907 908 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 909 << isa<CXXConstructorDecl>(Dcl); 910 return false; 911 } 912 913 if (const CXXConstructorDecl *Constructor 914 = dyn_cast<CXXConstructorDecl>(Dcl)) { 915 const CXXRecordDecl *RD = Constructor->getParent(); 916 // DR1359: 917 // - every non-variant non-static data member and base class sub-object 918 // shall be initialized; 919 // - if the class is a non-empty union, or for each non-empty anonymous 920 // union member of a non-union class, exactly one non-static data member 921 // shall be initialized; 922 if (RD->isUnion()) { 923 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 924 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 925 return false; 926 } 927 } else if (!Constructor->isDependentContext() && 928 !Constructor->isDelegatingConstructor()) { 929 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 930 931 // Skip detailed checking if we have enough initializers, and we would 932 // allow at most one initializer per member. 933 bool AnyAnonStructUnionMembers = false; 934 unsigned Fields = 0; 935 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 936 E = RD->field_end(); I != E; ++I, ++Fields) { 937 if (I->isAnonymousStructOrUnion()) { 938 AnyAnonStructUnionMembers = true; 939 break; 940 } 941 } 942 if (AnyAnonStructUnionMembers || 943 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 944 // Check initialization of non-static data members. Base classes are 945 // always initialized so do not need to be checked. Dependent bases 946 // might not have initializers in the member initializer list. 947 llvm::SmallSet<Decl*, 16> Inits; 948 for (CXXConstructorDecl::init_const_iterator 949 I = Constructor->init_begin(), E = Constructor->init_end(); 950 I != E; ++I) { 951 if (FieldDecl *FD = (*I)->getMember()) 952 Inits.insert(FD); 953 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 954 Inits.insert(ID->chain_begin(), ID->chain_end()); 955 } 956 957 bool Diagnosed = false; 958 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 959 E = RD->field_end(); I != E; ++I) 960 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 961 if (Diagnosed) 962 return false; 963 } 964 } 965 } else { 966 if (ReturnStmts.empty()) { 967 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 968 return false; 969 } 970 if (ReturnStmts.size() > 1) { 971 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 972 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 973 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 974 return false; 975 } 976 } 977 978 // C++11 [dcl.constexpr]p5: 979 // if no function argument values exist such that the function invocation 980 // substitution would produce a constant expression, the program is 981 // ill-formed; no diagnostic required. 982 // C++11 [dcl.constexpr]p3: 983 // - every constructor call and implicit conversion used in initializing the 984 // return value shall be one of those allowed in a constant expression. 985 // C++11 [dcl.constexpr]p4: 986 // - every constructor involved in initializing non-static data members and 987 // base class sub-objects shall be a constexpr constructor. 988 llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 989 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 990 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr) 991 << isa<CXXConstructorDecl>(Dcl); 992 for (size_t I = 0, N = Diags.size(); I != N; ++I) 993 Diag(Diags[I].first, Diags[I].second); 994 return false; 995 } 996 997 return true; 998} 999 1000/// isCurrentClassName - Determine whether the identifier II is the 1001/// name of the class type currently being defined. In the case of 1002/// nested classes, this will only return true if II is the name of 1003/// the innermost class. 1004bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 1005 const CXXScopeSpec *SS) { 1006 assert(getLangOpts().CPlusPlus && "No class names in C!"); 1007 1008 CXXRecordDecl *CurDecl; 1009 if (SS && SS->isSet() && !SS->isInvalid()) { 1010 DeclContext *DC = computeDeclContext(*SS, true); 1011 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 1012 } else 1013 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1014 1015 if (CurDecl && CurDecl->getIdentifier()) 1016 return &II == CurDecl->getIdentifier(); 1017 else 1018 return false; 1019} 1020 1021/// \brief Check the validity of a C++ base class specifier. 1022/// 1023/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1024/// and returns NULL otherwise. 1025CXXBaseSpecifier * 1026Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1027 SourceRange SpecifierRange, 1028 bool Virtual, AccessSpecifier Access, 1029 TypeSourceInfo *TInfo, 1030 SourceLocation EllipsisLoc) { 1031 QualType BaseType = TInfo->getType(); 1032 1033 // C++ [class.union]p1: 1034 // A union shall not have base classes. 1035 if (Class->isUnion()) { 1036 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1037 << SpecifierRange; 1038 return 0; 1039 } 1040 1041 if (EllipsisLoc.isValid() && 1042 !TInfo->getType()->containsUnexpandedParameterPack()) { 1043 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1044 << TInfo->getTypeLoc().getSourceRange(); 1045 EllipsisLoc = SourceLocation(); 1046 } 1047 1048 if (BaseType->isDependentType()) 1049 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1050 Class->getTagKind() == TTK_Class, 1051 Access, TInfo, EllipsisLoc); 1052 1053 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1054 1055 // Base specifiers must be record types. 1056 if (!BaseType->isRecordType()) { 1057 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1058 return 0; 1059 } 1060 1061 // C++ [class.union]p1: 1062 // A union shall not be used as a base class. 1063 if (BaseType->isUnionType()) { 1064 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1065 return 0; 1066 } 1067 1068 // C++ [class.derived]p2: 1069 // The class-name in a base-specifier shall not be an incompletely 1070 // defined class. 1071 if (RequireCompleteType(BaseLoc, BaseType, 1072 diag::err_incomplete_base_class, SpecifierRange)) { 1073 Class->setInvalidDecl(); 1074 return 0; 1075 } 1076 1077 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1078 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1079 assert(BaseDecl && "Record type has no declaration"); 1080 BaseDecl = BaseDecl->getDefinition(); 1081 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1082 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1083 assert(CXXBaseDecl && "Base type is not a C++ type"); 1084 1085 // C++ [class]p3: 1086 // If a class is marked final and it appears as a base-type-specifier in 1087 // base-clause, the program is ill-formed. 1088 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1089 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1090 << CXXBaseDecl->getDeclName(); 1091 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1092 << CXXBaseDecl->getDeclName(); 1093 return 0; 1094 } 1095 1096 if (BaseDecl->isInvalidDecl()) 1097 Class->setInvalidDecl(); 1098 1099 // Create the base specifier. 1100 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1101 Class->getTagKind() == TTK_Class, 1102 Access, TInfo, EllipsisLoc); 1103} 1104 1105/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1106/// one entry in the base class list of a class specifier, for 1107/// example: 1108/// class foo : public bar, virtual private baz { 1109/// 'public bar' and 'virtual private baz' are each base-specifiers. 1110BaseResult 1111Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1112 bool Virtual, AccessSpecifier Access, 1113 ParsedType basetype, SourceLocation BaseLoc, 1114 SourceLocation EllipsisLoc) { 1115 if (!classdecl) 1116 return true; 1117 1118 AdjustDeclIfTemplate(classdecl); 1119 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1120 if (!Class) 1121 return true; 1122 1123 TypeSourceInfo *TInfo = 0; 1124 GetTypeFromParser(basetype, &TInfo); 1125 1126 if (EllipsisLoc.isInvalid() && 1127 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1128 UPPC_BaseType)) 1129 return true; 1130 1131 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1132 Virtual, Access, TInfo, 1133 EllipsisLoc)) 1134 return BaseSpec; 1135 else 1136 Class->setInvalidDecl(); 1137 1138 return true; 1139} 1140 1141/// \brief Performs the actual work of attaching the given base class 1142/// specifiers to a C++ class. 1143bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1144 unsigned NumBases) { 1145 if (NumBases == 0) 1146 return false; 1147 1148 // Used to keep track of which base types we have already seen, so 1149 // that we can properly diagnose redundant direct base types. Note 1150 // that the key is always the unqualified canonical type of the base 1151 // class. 1152 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1153 1154 // Copy non-redundant base specifiers into permanent storage. 1155 unsigned NumGoodBases = 0; 1156 bool Invalid = false; 1157 for (unsigned idx = 0; idx < NumBases; ++idx) { 1158 QualType NewBaseType 1159 = Context.getCanonicalType(Bases[idx]->getType()); 1160 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1161 1162 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1163 if (KnownBase) { 1164 // C++ [class.mi]p3: 1165 // A class shall not be specified as a direct base class of a 1166 // derived class more than once. 1167 Diag(Bases[idx]->getLocStart(), 1168 diag::err_duplicate_base_class) 1169 << KnownBase->getType() 1170 << Bases[idx]->getSourceRange(); 1171 1172 // Delete the duplicate base class specifier; we're going to 1173 // overwrite its pointer later. 1174 Context.Deallocate(Bases[idx]); 1175 1176 Invalid = true; 1177 } else { 1178 // Okay, add this new base class. 1179 KnownBase = Bases[idx]; 1180 Bases[NumGoodBases++] = Bases[idx]; 1181 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1182 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1183 if (RD->hasAttr<WeakAttr>()) 1184 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1185 } 1186 } 1187 1188 // Attach the remaining base class specifiers to the derived class. 1189 Class->setBases(Bases, NumGoodBases); 1190 1191 // Delete the remaining (good) base class specifiers, since their 1192 // data has been copied into the CXXRecordDecl. 1193 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1194 Context.Deallocate(Bases[idx]); 1195 1196 return Invalid; 1197} 1198 1199/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1200/// class, after checking whether there are any duplicate base 1201/// classes. 1202void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1203 unsigned NumBases) { 1204 if (!ClassDecl || !Bases || !NumBases) 1205 return; 1206 1207 AdjustDeclIfTemplate(ClassDecl); 1208 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1209 (CXXBaseSpecifier**)(Bases), NumBases); 1210} 1211 1212static CXXRecordDecl *GetClassForType(QualType T) { 1213 if (const RecordType *RT = T->getAs<RecordType>()) 1214 return cast<CXXRecordDecl>(RT->getDecl()); 1215 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1216 return ICT->getDecl(); 1217 else 1218 return 0; 1219} 1220 1221/// \brief Determine whether the type \p Derived is a C++ class that is 1222/// derived from the type \p Base. 1223bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1224 if (!getLangOpts().CPlusPlus) 1225 return false; 1226 1227 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1228 if (!DerivedRD) 1229 return false; 1230 1231 CXXRecordDecl *BaseRD = GetClassForType(Base); 1232 if (!BaseRD) 1233 return false; 1234 1235 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1236 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1237} 1238 1239/// \brief Determine whether the type \p Derived is a C++ class that is 1240/// derived from the type \p Base. 1241bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1242 if (!getLangOpts().CPlusPlus) 1243 return false; 1244 1245 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1246 if (!DerivedRD) 1247 return false; 1248 1249 CXXRecordDecl *BaseRD = GetClassForType(Base); 1250 if (!BaseRD) 1251 return false; 1252 1253 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1254} 1255 1256void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1257 CXXCastPath &BasePathArray) { 1258 assert(BasePathArray.empty() && "Base path array must be empty!"); 1259 assert(Paths.isRecordingPaths() && "Must record paths!"); 1260 1261 const CXXBasePath &Path = Paths.front(); 1262 1263 // We first go backward and check if we have a virtual base. 1264 // FIXME: It would be better if CXXBasePath had the base specifier for 1265 // the nearest virtual base. 1266 unsigned Start = 0; 1267 for (unsigned I = Path.size(); I != 0; --I) { 1268 if (Path[I - 1].Base->isVirtual()) { 1269 Start = I - 1; 1270 break; 1271 } 1272 } 1273 1274 // Now add all bases. 1275 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1276 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1277} 1278 1279/// \brief Determine whether the given base path includes a virtual 1280/// base class. 1281bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1282 for (CXXCastPath::const_iterator B = BasePath.begin(), 1283 BEnd = BasePath.end(); 1284 B != BEnd; ++B) 1285 if ((*B)->isVirtual()) 1286 return true; 1287 1288 return false; 1289} 1290 1291/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1292/// conversion (where Derived and Base are class types) is 1293/// well-formed, meaning that the conversion is unambiguous (and 1294/// that all of the base classes are accessible). Returns true 1295/// and emits a diagnostic if the code is ill-formed, returns false 1296/// otherwise. Loc is the location where this routine should point to 1297/// if there is an error, and Range is the source range to highlight 1298/// if there is an error. 1299bool 1300Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1301 unsigned InaccessibleBaseID, 1302 unsigned AmbigiousBaseConvID, 1303 SourceLocation Loc, SourceRange Range, 1304 DeclarationName Name, 1305 CXXCastPath *BasePath) { 1306 // First, determine whether the path from Derived to Base is 1307 // ambiguous. This is slightly more expensive than checking whether 1308 // the Derived to Base conversion exists, because here we need to 1309 // explore multiple paths to determine if there is an ambiguity. 1310 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1311 /*DetectVirtual=*/false); 1312 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1313 assert(DerivationOkay && 1314 "Can only be used with a derived-to-base conversion"); 1315 (void)DerivationOkay; 1316 1317 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1318 if (InaccessibleBaseID) { 1319 // Check that the base class can be accessed. 1320 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1321 InaccessibleBaseID)) { 1322 case AR_inaccessible: 1323 return true; 1324 case AR_accessible: 1325 case AR_dependent: 1326 case AR_delayed: 1327 break; 1328 } 1329 } 1330 1331 // Build a base path if necessary. 1332 if (BasePath) 1333 BuildBasePathArray(Paths, *BasePath); 1334 return false; 1335 } 1336 1337 // We know that the derived-to-base conversion is ambiguous, and 1338 // we're going to produce a diagnostic. Perform the derived-to-base 1339 // search just one more time to compute all of the possible paths so 1340 // that we can print them out. This is more expensive than any of 1341 // the previous derived-to-base checks we've done, but at this point 1342 // performance isn't as much of an issue. 1343 Paths.clear(); 1344 Paths.setRecordingPaths(true); 1345 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1346 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1347 (void)StillOkay; 1348 1349 // Build up a textual representation of the ambiguous paths, e.g., 1350 // D -> B -> A, that will be used to illustrate the ambiguous 1351 // conversions in the diagnostic. We only print one of the paths 1352 // to each base class subobject. 1353 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1354 1355 Diag(Loc, AmbigiousBaseConvID) 1356 << Derived << Base << PathDisplayStr << Range << Name; 1357 return true; 1358} 1359 1360bool 1361Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1362 SourceLocation Loc, SourceRange Range, 1363 CXXCastPath *BasePath, 1364 bool IgnoreAccess) { 1365 return CheckDerivedToBaseConversion(Derived, Base, 1366 IgnoreAccess ? 0 1367 : diag::err_upcast_to_inaccessible_base, 1368 diag::err_ambiguous_derived_to_base_conv, 1369 Loc, Range, DeclarationName(), 1370 BasePath); 1371} 1372 1373 1374/// @brief Builds a string representing ambiguous paths from a 1375/// specific derived class to different subobjects of the same base 1376/// class. 1377/// 1378/// This function builds a string that can be used in error messages 1379/// to show the different paths that one can take through the 1380/// inheritance hierarchy to go from the derived class to different 1381/// subobjects of a base class. The result looks something like this: 1382/// @code 1383/// struct D -> struct B -> struct A 1384/// struct D -> struct C -> struct A 1385/// @endcode 1386std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1387 std::string PathDisplayStr; 1388 std::set<unsigned> DisplayedPaths; 1389 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1390 Path != Paths.end(); ++Path) { 1391 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1392 // We haven't displayed a path to this particular base 1393 // class subobject yet. 1394 PathDisplayStr += "\n "; 1395 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1396 for (CXXBasePath::const_iterator Element = Path->begin(); 1397 Element != Path->end(); ++Element) 1398 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1399 } 1400 } 1401 1402 return PathDisplayStr; 1403} 1404 1405//===----------------------------------------------------------------------===// 1406// C++ class member Handling 1407//===----------------------------------------------------------------------===// 1408 1409/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1410bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1411 SourceLocation ASLoc, 1412 SourceLocation ColonLoc, 1413 AttributeList *Attrs) { 1414 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1415 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1416 ASLoc, ColonLoc); 1417 CurContext->addHiddenDecl(ASDecl); 1418 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1419} 1420 1421/// CheckOverrideControl - Check C++11 override control semantics. 1422void Sema::CheckOverrideControl(Decl *D) { 1423 if (D->isInvalidDecl()) 1424 return; 1425 1426 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1427 1428 // Do we know which functions this declaration might be overriding? 1429 bool OverridesAreKnown = !MD || 1430 (!MD->getParent()->hasAnyDependentBases() && 1431 !MD->getType()->isDependentType()); 1432 1433 if (!MD || !MD->isVirtual()) { 1434 if (OverridesAreKnown) { 1435 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1436 Diag(OA->getLocation(), 1437 diag::override_keyword_only_allowed_on_virtual_member_functions) 1438 << "override" << FixItHint::CreateRemoval(OA->getLocation()); 1439 D->dropAttr<OverrideAttr>(); 1440 } 1441 if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1442 Diag(FA->getLocation(), 1443 diag::override_keyword_only_allowed_on_virtual_member_functions) 1444 << "final" << FixItHint::CreateRemoval(FA->getLocation()); 1445 D->dropAttr<FinalAttr>(); 1446 } 1447 } 1448 return; 1449 } 1450 1451 if (!OverridesAreKnown) 1452 return; 1453 1454 // C++11 [class.virtual]p5: 1455 // If a virtual function is marked with the virt-specifier override and 1456 // does not override a member function of a base class, the program is 1457 // ill-formed. 1458 bool HasOverriddenMethods = 1459 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1460 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) 1461 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) 1462 << MD->getDeclName(); 1463} 1464 1465/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1466/// function overrides a virtual member function marked 'final', according to 1467/// C++11 [class.virtual]p4. 1468bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1469 const CXXMethodDecl *Old) { 1470 if (!Old->hasAttr<FinalAttr>()) 1471 return false; 1472 1473 Diag(New->getLocation(), diag::err_final_function_overridden) 1474 << New->getDeclName(); 1475 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1476 return true; 1477} 1478 1479static bool InitializationHasSideEffects(const FieldDecl &FD) { 1480 const Type *T = FD.getType()->getBaseElementTypeUnsafe(); 1481 // FIXME: Destruction of ObjC lifetime types has side-effects. 1482 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) 1483 return !RD->isCompleteDefinition() || 1484 !RD->hasTrivialDefaultConstructor() || 1485 !RD->hasTrivialDestructor(); 1486 return false; 1487} 1488 1489/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1490/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1491/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1492/// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1493/// present (but parsing it has been deferred). 1494Decl * 1495Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1496 MultiTemplateParamsArg TemplateParameterLists, 1497 Expr *BW, const VirtSpecifiers &VS, 1498 InClassInitStyle InitStyle) { 1499 const DeclSpec &DS = D.getDeclSpec(); 1500 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1501 DeclarationName Name = NameInfo.getName(); 1502 SourceLocation Loc = NameInfo.getLoc(); 1503 1504 // For anonymous bitfields, the location should point to the type. 1505 if (Loc.isInvalid()) 1506 Loc = D.getLocStart(); 1507 1508 Expr *BitWidth = static_cast<Expr*>(BW); 1509 1510 assert(isa<CXXRecordDecl>(CurContext)); 1511 assert(!DS.isFriendSpecified()); 1512 1513 bool isFunc = D.isDeclarationOfFunction(); 1514 1515 // C++ 9.2p6: A member shall not be declared to have automatic storage 1516 // duration (auto, register) or with the extern storage-class-specifier. 1517 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1518 // data members and cannot be applied to names declared const or static, 1519 // and cannot be applied to reference members. 1520 switch (DS.getStorageClassSpec()) { 1521 case DeclSpec::SCS_unspecified: 1522 case DeclSpec::SCS_typedef: 1523 case DeclSpec::SCS_static: 1524 // FALL THROUGH. 1525 break; 1526 case DeclSpec::SCS_mutable: 1527 if (isFunc) { 1528 if (DS.getStorageClassSpecLoc().isValid()) 1529 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1530 else 1531 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1532 1533 // FIXME: It would be nicer if the keyword was ignored only for this 1534 // declarator. Otherwise we could get follow-up errors. 1535 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1536 } 1537 break; 1538 default: 1539 if (DS.getStorageClassSpecLoc().isValid()) 1540 Diag(DS.getStorageClassSpecLoc(), 1541 diag::err_storageclass_invalid_for_member); 1542 else 1543 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1544 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1545 } 1546 1547 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1548 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1549 !isFunc); 1550 1551 Decl *Member; 1552 if (isInstField) { 1553 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1554 1555 // Data members must have identifiers for names. 1556 if (!Name.isIdentifier()) { 1557 Diag(Loc, diag::err_bad_variable_name) 1558 << Name; 1559 return 0; 1560 } 1561 1562 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1563 1564 // Member field could not be with "template" keyword. 1565 // So TemplateParameterLists should be empty in this case. 1566 if (TemplateParameterLists.size()) { 1567 TemplateParameterList* TemplateParams = TemplateParameterLists[0]; 1568 if (TemplateParams->size()) { 1569 // There is no such thing as a member field template. 1570 Diag(D.getIdentifierLoc(), diag::err_template_member) 1571 << II 1572 << SourceRange(TemplateParams->getTemplateLoc(), 1573 TemplateParams->getRAngleLoc()); 1574 } else { 1575 // There is an extraneous 'template<>' for this member. 1576 Diag(TemplateParams->getTemplateLoc(), 1577 diag::err_template_member_noparams) 1578 << II 1579 << SourceRange(TemplateParams->getTemplateLoc(), 1580 TemplateParams->getRAngleLoc()); 1581 } 1582 return 0; 1583 } 1584 1585 if (SS.isSet() && !SS.isInvalid()) { 1586 // The user provided a superfluous scope specifier inside a class 1587 // definition: 1588 // 1589 // class X { 1590 // int X::member; 1591 // }; 1592 if (DeclContext *DC = computeDeclContext(SS, false)) 1593 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1594 else 1595 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1596 << Name << SS.getRange(); 1597 1598 SS.clear(); 1599 } 1600 1601 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1602 InitStyle, AS); 1603 assert(Member && "HandleField never returns null"); 1604 } else { 1605 assert(InitStyle == ICIS_NoInit); 1606 1607 Member = HandleDeclarator(S, D, TemplateParameterLists); 1608 if (!Member) { 1609 return 0; 1610 } 1611 1612 // Non-instance-fields can't have a bitfield. 1613 if (BitWidth) { 1614 if (Member->isInvalidDecl()) { 1615 // don't emit another diagnostic. 1616 } else if (isa<VarDecl>(Member)) { 1617 // C++ 9.6p3: A bit-field shall not be a static member. 1618 // "static member 'A' cannot be a bit-field" 1619 Diag(Loc, diag::err_static_not_bitfield) 1620 << Name << BitWidth->getSourceRange(); 1621 } else if (isa<TypedefDecl>(Member)) { 1622 // "typedef member 'x' cannot be a bit-field" 1623 Diag(Loc, diag::err_typedef_not_bitfield) 1624 << Name << BitWidth->getSourceRange(); 1625 } else { 1626 // A function typedef ("typedef int f(); f a;"). 1627 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1628 Diag(Loc, diag::err_not_integral_type_bitfield) 1629 << Name << cast<ValueDecl>(Member)->getType() 1630 << BitWidth->getSourceRange(); 1631 } 1632 1633 BitWidth = 0; 1634 Member->setInvalidDecl(); 1635 } 1636 1637 Member->setAccess(AS); 1638 1639 // If we have declared a member function template, set the access of the 1640 // templated declaration as well. 1641 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1642 FunTmpl->getTemplatedDecl()->setAccess(AS); 1643 } 1644 1645 if (VS.isOverrideSpecified()) 1646 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1647 if (VS.isFinalSpecified()) 1648 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1649 1650 if (VS.getLastLocation().isValid()) { 1651 // Update the end location of a method that has a virt-specifiers. 1652 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1653 MD->setRangeEnd(VS.getLastLocation()); 1654 } 1655 1656 CheckOverrideControl(Member); 1657 1658 assert((Name || isInstField) && "No identifier for non-field ?"); 1659 1660 if (isInstField) { 1661 FieldDecl *FD = cast<FieldDecl>(Member); 1662 FieldCollector->Add(FD); 1663 1664 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 1665 FD->getLocation()) 1666 != DiagnosticsEngine::Ignored) { 1667 // Remember all explicit private FieldDecls that have a name, no side 1668 // effects and are not part of a dependent type declaration. 1669 if (!FD->isImplicit() && FD->getDeclName() && 1670 FD->getAccess() == AS_private && 1671 !FD->hasAttr<UnusedAttr>() && 1672 !FD->getParent()->isDependentContext() && 1673 !InitializationHasSideEffects(*FD)) 1674 UnusedPrivateFields.insert(FD); 1675 } 1676 } 1677 1678 return Member; 1679} 1680 1681namespace { 1682 class UninitializedFieldVisitor 1683 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 1684 Sema &S; 1685 ValueDecl *VD; 1686 public: 1687 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 1688 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context), 1689 S(S), VD(VD) { 1690 } 1691 1692 void HandleExpr(Expr *E) { 1693 if (!E) return; 1694 1695 // Expressions like x(x) sometimes lack the surrounding expressions 1696 // but need to be checked anyways. 1697 HandleValue(E); 1698 Visit(E); 1699 } 1700 1701 void HandleValue(Expr *E) { 1702 E = E->IgnoreParens(); 1703 1704 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 1705 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 1706 return; 1707 Expr *Base = E; 1708 while (isa<MemberExpr>(Base)) { 1709 ME = dyn_cast<MemberExpr>(Base); 1710 if (VarDecl *VarD = dyn_cast<VarDecl>(ME->getMemberDecl())) 1711 if (VarD->hasGlobalStorage()) 1712 return; 1713 Base = ME->getBase(); 1714 } 1715 1716 if (VD == ME->getMemberDecl() && isa<CXXThisExpr>(Base)) { 1717 unsigned diag = VD->getType()->isReferenceType() 1718 ? diag::warn_reference_field_is_uninit 1719 : diag::warn_field_is_uninit; 1720 S.Diag(ME->getExprLoc(), diag) << ME->getMemberNameInfo().getName(); 1721 return; 1722 } 1723 } 1724 1725 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 1726 HandleValue(CO->getTrueExpr()); 1727 HandleValue(CO->getFalseExpr()); 1728 return; 1729 } 1730 1731 if (BinaryConditionalOperator *BCO = 1732 dyn_cast<BinaryConditionalOperator>(E)) { 1733 HandleValue(BCO->getCommon()); 1734 HandleValue(BCO->getFalseExpr()); 1735 return; 1736 } 1737 1738 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 1739 switch (BO->getOpcode()) { 1740 default: 1741 return; 1742 case(BO_PtrMemD): 1743 case(BO_PtrMemI): 1744 HandleValue(BO->getLHS()); 1745 return; 1746 case(BO_Comma): 1747 HandleValue(BO->getRHS()); 1748 return; 1749 } 1750 } 1751 } 1752 1753 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 1754 if (E->getCastKind() == CK_LValueToRValue) 1755 HandleValue(E->getSubExpr()); 1756 1757 Inherited::VisitImplicitCastExpr(E); 1758 } 1759 1760 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 1761 Expr *Callee = E->getCallee(); 1762 if (isa<MemberExpr>(Callee)) 1763 HandleValue(Callee); 1764 1765 Inherited::VisitCXXMemberCallExpr(E); 1766 } 1767 }; 1768 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E, 1769 ValueDecl *VD) { 1770 UninitializedFieldVisitor(S, VD).HandleExpr(E); 1771 } 1772} // namespace 1773 1774/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1775/// in-class initializer for a non-static C++ class member, and after 1776/// instantiating an in-class initializer in a class template. Such actions 1777/// are deferred until the class is complete. 1778void 1779Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 1780 Expr *InitExpr) { 1781 FieldDecl *FD = cast<FieldDecl>(D); 1782 assert(FD->getInClassInitStyle() != ICIS_NoInit && 1783 "must set init style when field is created"); 1784 1785 if (!InitExpr) { 1786 FD->setInvalidDecl(); 1787 FD->removeInClassInitializer(); 1788 return; 1789 } 1790 1791 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1792 FD->setInvalidDecl(); 1793 FD->removeInClassInitializer(); 1794 return; 1795 } 1796 1797 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, InitLoc) 1798 != DiagnosticsEngine::Ignored) { 1799 CheckInitExprContainsUninitializedFields(*this, InitExpr, FD); 1800 } 1801 1802 ExprResult Init = InitExpr; 1803 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent() && 1804 !FD->getDeclContext()->isDependentContext()) { 1805 // Note: We don't type-check when we're in a dependent context, because 1806 // the initialization-substitution code does not properly handle direct 1807 // list initialization. We have the same hackaround for ctor-initializers. 1808 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1809 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1810 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1811 } 1812 Expr **Inits = &InitExpr; 1813 unsigned NumInits = 1; 1814 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1815 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 1816 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1817 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 1818 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 1819 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 1820 if (Init.isInvalid()) { 1821 FD->setInvalidDecl(); 1822 return; 1823 } 1824 1825 CheckImplicitConversions(Init.get(), InitLoc); 1826 } 1827 1828 // C++0x [class.base.init]p7: 1829 // The initialization of each base and member constitutes a 1830 // full-expression. 1831 Init = MaybeCreateExprWithCleanups(Init); 1832 if (Init.isInvalid()) { 1833 FD->setInvalidDecl(); 1834 return; 1835 } 1836 1837 InitExpr = Init.release(); 1838 1839 FD->setInClassInitializer(InitExpr); 1840} 1841 1842/// \brief Find the direct and/or virtual base specifiers that 1843/// correspond to the given base type, for use in base initialization 1844/// within a constructor. 1845static bool FindBaseInitializer(Sema &SemaRef, 1846 CXXRecordDecl *ClassDecl, 1847 QualType BaseType, 1848 const CXXBaseSpecifier *&DirectBaseSpec, 1849 const CXXBaseSpecifier *&VirtualBaseSpec) { 1850 // First, check for a direct base class. 1851 DirectBaseSpec = 0; 1852 for (CXXRecordDecl::base_class_const_iterator Base 1853 = ClassDecl->bases_begin(); 1854 Base != ClassDecl->bases_end(); ++Base) { 1855 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1856 // We found a direct base of this type. That's what we're 1857 // initializing. 1858 DirectBaseSpec = &*Base; 1859 break; 1860 } 1861 } 1862 1863 // Check for a virtual base class. 1864 // FIXME: We might be able to short-circuit this if we know in advance that 1865 // there are no virtual bases. 1866 VirtualBaseSpec = 0; 1867 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1868 // We haven't found a base yet; search the class hierarchy for a 1869 // virtual base class. 1870 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1871 /*DetectVirtual=*/false); 1872 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1873 BaseType, Paths)) { 1874 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1875 Path != Paths.end(); ++Path) { 1876 if (Path->back().Base->isVirtual()) { 1877 VirtualBaseSpec = Path->back().Base; 1878 break; 1879 } 1880 } 1881 } 1882 } 1883 1884 return DirectBaseSpec || VirtualBaseSpec; 1885} 1886 1887/// \brief Handle a C++ member initializer using braced-init-list syntax. 1888MemInitResult 1889Sema::ActOnMemInitializer(Decl *ConstructorD, 1890 Scope *S, 1891 CXXScopeSpec &SS, 1892 IdentifierInfo *MemberOrBase, 1893 ParsedType TemplateTypeTy, 1894 const DeclSpec &DS, 1895 SourceLocation IdLoc, 1896 Expr *InitList, 1897 SourceLocation EllipsisLoc) { 1898 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1899 DS, IdLoc, InitList, 1900 EllipsisLoc); 1901} 1902 1903/// \brief Handle a C++ member initializer using parentheses syntax. 1904MemInitResult 1905Sema::ActOnMemInitializer(Decl *ConstructorD, 1906 Scope *S, 1907 CXXScopeSpec &SS, 1908 IdentifierInfo *MemberOrBase, 1909 ParsedType TemplateTypeTy, 1910 const DeclSpec &DS, 1911 SourceLocation IdLoc, 1912 SourceLocation LParenLoc, 1913 Expr **Args, unsigned NumArgs, 1914 SourceLocation RParenLoc, 1915 SourceLocation EllipsisLoc) { 1916 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, 1917 llvm::makeArrayRef(Args, NumArgs), 1918 RParenLoc); 1919 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1920 DS, IdLoc, List, EllipsisLoc); 1921} 1922 1923namespace { 1924 1925// Callback to only accept typo corrections that can be a valid C++ member 1926// intializer: either a non-static field member or a base class. 1927class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1928 public: 1929 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1930 : ClassDecl(ClassDecl) {} 1931 1932 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1933 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1934 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1935 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1936 else 1937 return isa<TypeDecl>(ND); 1938 } 1939 return false; 1940 } 1941 1942 private: 1943 CXXRecordDecl *ClassDecl; 1944}; 1945 1946} 1947 1948/// \brief Handle a C++ member initializer. 1949MemInitResult 1950Sema::BuildMemInitializer(Decl *ConstructorD, 1951 Scope *S, 1952 CXXScopeSpec &SS, 1953 IdentifierInfo *MemberOrBase, 1954 ParsedType TemplateTypeTy, 1955 const DeclSpec &DS, 1956 SourceLocation IdLoc, 1957 Expr *Init, 1958 SourceLocation EllipsisLoc) { 1959 if (!ConstructorD) 1960 return true; 1961 1962 AdjustDeclIfTemplate(ConstructorD); 1963 1964 CXXConstructorDecl *Constructor 1965 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1966 if (!Constructor) { 1967 // The user wrote a constructor initializer on a function that is 1968 // not a C++ constructor. Ignore the error for now, because we may 1969 // have more member initializers coming; we'll diagnose it just 1970 // once in ActOnMemInitializers. 1971 return true; 1972 } 1973 1974 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1975 1976 // C++ [class.base.init]p2: 1977 // Names in a mem-initializer-id are looked up in the scope of the 1978 // constructor's class and, if not found in that scope, are looked 1979 // up in the scope containing the constructor's definition. 1980 // [Note: if the constructor's class contains a member with the 1981 // same name as a direct or virtual base class of the class, a 1982 // mem-initializer-id naming the member or base class and composed 1983 // of a single identifier refers to the class member. A 1984 // mem-initializer-id for the hidden base class may be specified 1985 // using a qualified name. ] 1986 if (!SS.getScopeRep() && !TemplateTypeTy) { 1987 // Look for a member, first. 1988 DeclContext::lookup_result Result 1989 = ClassDecl->lookup(MemberOrBase); 1990 if (Result.first != Result.second) { 1991 ValueDecl *Member; 1992 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1993 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1994 if (EllipsisLoc.isValid()) 1995 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1996 << MemberOrBase 1997 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 1998 1999 return BuildMemberInitializer(Member, Init, IdLoc); 2000 } 2001 } 2002 } 2003 // It didn't name a member, so see if it names a class. 2004 QualType BaseType; 2005 TypeSourceInfo *TInfo = 0; 2006 2007 if (TemplateTypeTy) { 2008 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 2009 } else if (DS.getTypeSpecType() == TST_decltype) { 2010 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 2011 } else { 2012 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 2013 LookupParsedName(R, S, &SS); 2014 2015 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 2016 if (!TyD) { 2017 if (R.isAmbiguous()) return true; 2018 2019 // We don't want access-control diagnostics here. 2020 R.suppressDiagnostics(); 2021 2022 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 2023 bool NotUnknownSpecialization = false; 2024 DeclContext *DC = computeDeclContext(SS, false); 2025 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 2026 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 2027 2028 if (!NotUnknownSpecialization) { 2029 // When the scope specifier can refer to a member of an unknown 2030 // specialization, we take it as a type name. 2031 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 2032 SS.getWithLocInContext(Context), 2033 *MemberOrBase, IdLoc); 2034 if (BaseType.isNull()) 2035 return true; 2036 2037 R.clear(); 2038 R.setLookupName(MemberOrBase); 2039 } 2040 } 2041 2042 // If no results were found, try to correct typos. 2043 TypoCorrection Corr; 2044 MemInitializerValidatorCCC Validator(ClassDecl); 2045 if (R.empty() && BaseType.isNull() && 2046 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 2047 Validator, ClassDecl))) { 2048 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 2049 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 2050 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 2051 // We have found a non-static data member with a similar 2052 // name to what was typed; complain and initialize that 2053 // member. 2054 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2055 << MemberOrBase << true << CorrectedQuotedStr 2056 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2057 Diag(Member->getLocation(), diag::note_previous_decl) 2058 << CorrectedQuotedStr; 2059 2060 return BuildMemberInitializer(Member, Init, IdLoc); 2061 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 2062 const CXXBaseSpecifier *DirectBaseSpec; 2063 const CXXBaseSpecifier *VirtualBaseSpec; 2064 if (FindBaseInitializer(*this, ClassDecl, 2065 Context.getTypeDeclType(Type), 2066 DirectBaseSpec, VirtualBaseSpec)) { 2067 // We have found a direct or virtual base class with a 2068 // similar name to what was typed; complain and initialize 2069 // that base class. 2070 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2071 << MemberOrBase << false << CorrectedQuotedStr 2072 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2073 2074 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 2075 : VirtualBaseSpec; 2076 Diag(BaseSpec->getLocStart(), 2077 diag::note_base_class_specified_here) 2078 << BaseSpec->getType() 2079 << BaseSpec->getSourceRange(); 2080 2081 TyD = Type; 2082 } 2083 } 2084 } 2085 2086 if (!TyD && BaseType.isNull()) { 2087 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 2088 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 2089 return true; 2090 } 2091 } 2092 2093 if (BaseType.isNull()) { 2094 BaseType = Context.getTypeDeclType(TyD); 2095 if (SS.isSet()) { 2096 NestedNameSpecifier *Qualifier = 2097 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2098 2099 // FIXME: preserve source range information 2100 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 2101 } 2102 } 2103 } 2104 2105 if (!TInfo) 2106 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 2107 2108 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 2109} 2110 2111/// Checks a member initializer expression for cases where reference (or 2112/// pointer) members are bound to by-value parameters (or their addresses). 2113static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 2114 Expr *Init, 2115 SourceLocation IdLoc) { 2116 QualType MemberTy = Member->getType(); 2117 2118 // We only handle pointers and references currently. 2119 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 2120 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 2121 return; 2122 2123 const bool IsPointer = MemberTy->isPointerType(); 2124 if (IsPointer) { 2125 if (const UnaryOperator *Op 2126 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2127 // The only case we're worried about with pointers requires taking the 2128 // address. 2129 if (Op->getOpcode() != UO_AddrOf) 2130 return; 2131 2132 Init = Op->getSubExpr(); 2133 } else { 2134 // We only handle address-of expression initializers for pointers. 2135 return; 2136 } 2137 } 2138 2139 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 2140 // Taking the address of a temporary will be diagnosed as a hard error. 2141 if (IsPointer) 2142 return; 2143 2144 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 2145 << Member << Init->getSourceRange(); 2146 } else if (const DeclRefExpr *DRE 2147 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2148 // We only warn when referring to a non-reference parameter declaration. 2149 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2150 if (!Parameter || Parameter->getType()->isReferenceType()) 2151 return; 2152 2153 S.Diag(Init->getExprLoc(), 2154 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2155 : diag::warn_bind_ref_member_to_parameter) 2156 << Member << Parameter << Init->getSourceRange(); 2157 } else { 2158 // Other initializers are fine. 2159 return; 2160 } 2161 2162 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2163 << (unsigned)IsPointer; 2164} 2165 2166MemInitResult 2167Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2168 SourceLocation IdLoc) { 2169 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2170 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2171 assert((DirectMember || IndirectMember) && 2172 "Member must be a FieldDecl or IndirectFieldDecl"); 2173 2174 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2175 return true; 2176 2177 if (Member->isInvalidDecl()) 2178 return true; 2179 2180 // Diagnose value-uses of fields to initialize themselves, e.g. 2181 // foo(foo) 2182 // where foo is not also a parameter to the constructor. 2183 // TODO: implement -Wuninitialized and fold this into that framework. 2184 Expr **Args; 2185 unsigned NumArgs; 2186 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2187 Args = ParenList->getExprs(); 2188 NumArgs = ParenList->getNumExprs(); 2189 } else { 2190 InitListExpr *InitList = cast<InitListExpr>(Init); 2191 Args = InitList->getInits(); 2192 NumArgs = InitList->getNumInits(); 2193 } 2194 2195 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc) 2196 != DiagnosticsEngine::Ignored) 2197 for (unsigned i = 0; i < NumArgs; ++i) 2198 // FIXME: Warn about the case when other fields are used before being 2199 // initialized. For example, let this field be the i'th field. When 2200 // initializing the i'th field, throw a warning if any of the >= i'th 2201 // fields are used, as they are not yet initialized. 2202 // Right now we are only handling the case where the i'th field uses 2203 // itself in its initializer. 2204 // Also need to take into account that some fields may be initialized by 2205 // in-class initializers, see C++11 [class.base.init]p9. 2206 CheckInitExprContainsUninitializedFields(*this, Args[i], Member); 2207 2208 SourceRange InitRange = Init->getSourceRange(); 2209 2210 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2211 // Can't check initialization for a member of dependent type or when 2212 // any of the arguments are type-dependent expressions. 2213 DiscardCleanupsInEvaluationContext(); 2214 } else { 2215 bool InitList = false; 2216 if (isa<InitListExpr>(Init)) { 2217 InitList = true; 2218 Args = &Init; 2219 NumArgs = 1; 2220 2221 if (isStdInitializerList(Member->getType(), 0)) { 2222 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2223 << /*at end of ctor*/1 << InitRange; 2224 } 2225 } 2226 2227 // Initialize the member. 2228 InitializedEntity MemberEntity = 2229 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2230 : InitializedEntity::InitializeMember(IndirectMember, 0); 2231 InitializationKind Kind = 2232 InitList ? InitializationKind::CreateDirectList(IdLoc) 2233 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2234 InitRange.getEnd()); 2235 2236 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2237 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2238 MultiExprArg(Args, NumArgs), 2239 0); 2240 if (MemberInit.isInvalid()) 2241 return true; 2242 2243 CheckImplicitConversions(MemberInit.get(), 2244 InitRange.getBegin()); 2245 2246 // C++0x [class.base.init]p7: 2247 // The initialization of each base and member constitutes a 2248 // full-expression. 2249 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2250 if (MemberInit.isInvalid()) 2251 return true; 2252 2253 // If we are in a dependent context, template instantiation will 2254 // perform this type-checking again. Just save the arguments that we 2255 // received. 2256 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2257 // of the information that we have about the member 2258 // initializer. However, deconstructing the ASTs is a dicey process, 2259 // and this approach is far more likely to get the corner cases right. 2260 if (CurContext->isDependentContext()) { 2261 // The existing Init will do fine. 2262 } else { 2263 Init = MemberInit.get(); 2264 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2265 } 2266 } 2267 2268 if (DirectMember) { 2269 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2270 InitRange.getBegin(), Init, 2271 InitRange.getEnd()); 2272 } else { 2273 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2274 InitRange.getBegin(), Init, 2275 InitRange.getEnd()); 2276 } 2277} 2278 2279MemInitResult 2280Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2281 CXXRecordDecl *ClassDecl) { 2282 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2283 if (!LangOpts.CPlusPlus0x) 2284 return Diag(NameLoc, diag::err_delegating_ctor) 2285 << TInfo->getTypeLoc().getLocalSourceRange(); 2286 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2287 2288 bool InitList = true; 2289 Expr **Args = &Init; 2290 unsigned NumArgs = 1; 2291 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2292 InitList = false; 2293 Args = ParenList->getExprs(); 2294 NumArgs = ParenList->getNumExprs(); 2295 } 2296 2297 SourceRange InitRange = Init->getSourceRange(); 2298 // Initialize the object. 2299 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2300 QualType(ClassDecl->getTypeForDecl(), 0)); 2301 InitializationKind Kind = 2302 InitList ? InitializationKind::CreateDirectList(NameLoc) 2303 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2304 InitRange.getEnd()); 2305 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2306 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2307 MultiExprArg(Args, NumArgs), 2308 0); 2309 if (DelegationInit.isInvalid()) 2310 return true; 2311 2312 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2313 "Delegating constructor with no target?"); 2314 2315 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2316 2317 // C++0x [class.base.init]p7: 2318 // The initialization of each base and member constitutes a 2319 // full-expression. 2320 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2321 if (DelegationInit.isInvalid()) 2322 return true; 2323 2324 // If we are in a dependent context, template instantiation will 2325 // perform this type-checking again. Just save the arguments that we 2326 // received in a ParenListExpr. 2327 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2328 // of the information that we have about the base 2329 // initializer. However, deconstructing the ASTs is a dicey process, 2330 // and this approach is far more likely to get the corner cases right. 2331 if (CurContext->isDependentContext()) 2332 DelegationInit = Owned(Init); 2333 2334 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2335 DelegationInit.takeAs<Expr>(), 2336 InitRange.getEnd()); 2337} 2338 2339MemInitResult 2340Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2341 Expr *Init, CXXRecordDecl *ClassDecl, 2342 SourceLocation EllipsisLoc) { 2343 SourceLocation BaseLoc 2344 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2345 2346 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2347 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2348 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2349 2350 // C++ [class.base.init]p2: 2351 // [...] Unless the mem-initializer-id names a nonstatic data 2352 // member of the constructor's class or a direct or virtual base 2353 // of that class, the mem-initializer is ill-formed. A 2354 // mem-initializer-list can initialize a base class using any 2355 // name that denotes that base class type. 2356 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2357 2358 SourceRange InitRange = Init->getSourceRange(); 2359 if (EllipsisLoc.isValid()) { 2360 // This is a pack expansion. 2361 if (!BaseType->containsUnexpandedParameterPack()) { 2362 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2363 << SourceRange(BaseLoc, InitRange.getEnd()); 2364 2365 EllipsisLoc = SourceLocation(); 2366 } 2367 } else { 2368 // Check for any unexpanded parameter packs. 2369 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2370 return true; 2371 2372 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2373 return true; 2374 } 2375 2376 // Check for direct and virtual base classes. 2377 const CXXBaseSpecifier *DirectBaseSpec = 0; 2378 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2379 if (!Dependent) { 2380 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2381 BaseType)) 2382 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2383 2384 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2385 VirtualBaseSpec); 2386 2387 // C++ [base.class.init]p2: 2388 // Unless the mem-initializer-id names a nonstatic data member of the 2389 // constructor's class or a direct or virtual base of that class, the 2390 // mem-initializer is ill-formed. 2391 if (!DirectBaseSpec && !VirtualBaseSpec) { 2392 // If the class has any dependent bases, then it's possible that 2393 // one of those types will resolve to the same type as 2394 // BaseType. Therefore, just treat this as a dependent base 2395 // class initialization. FIXME: Should we try to check the 2396 // initialization anyway? It seems odd. 2397 if (ClassDecl->hasAnyDependentBases()) 2398 Dependent = true; 2399 else 2400 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2401 << BaseType << Context.getTypeDeclType(ClassDecl) 2402 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2403 } 2404 } 2405 2406 if (Dependent) { 2407 DiscardCleanupsInEvaluationContext(); 2408 2409 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2410 /*IsVirtual=*/false, 2411 InitRange.getBegin(), Init, 2412 InitRange.getEnd(), EllipsisLoc); 2413 } 2414 2415 // C++ [base.class.init]p2: 2416 // If a mem-initializer-id is ambiguous because it designates both 2417 // a direct non-virtual base class and an inherited virtual base 2418 // class, the mem-initializer is ill-formed. 2419 if (DirectBaseSpec && VirtualBaseSpec) 2420 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2421 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2422 2423 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2424 if (!BaseSpec) 2425 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2426 2427 // Initialize the base. 2428 bool InitList = true; 2429 Expr **Args = &Init; 2430 unsigned NumArgs = 1; 2431 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2432 InitList = false; 2433 Args = ParenList->getExprs(); 2434 NumArgs = ParenList->getNumExprs(); 2435 } 2436 2437 InitializedEntity BaseEntity = 2438 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2439 InitializationKind Kind = 2440 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2441 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2442 InitRange.getEnd()); 2443 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2444 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2445 MultiExprArg(Args, NumArgs), 0); 2446 if (BaseInit.isInvalid()) 2447 return true; 2448 2449 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2450 2451 // C++0x [class.base.init]p7: 2452 // The initialization of each base and member constitutes a 2453 // full-expression. 2454 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2455 if (BaseInit.isInvalid()) 2456 return true; 2457 2458 // If we are in a dependent context, template instantiation will 2459 // perform this type-checking again. Just save the arguments that we 2460 // received in a ParenListExpr. 2461 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2462 // of the information that we have about the base 2463 // initializer. However, deconstructing the ASTs is a dicey process, 2464 // and this approach is far more likely to get the corner cases right. 2465 if (CurContext->isDependentContext()) 2466 BaseInit = Owned(Init); 2467 2468 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2469 BaseSpec->isVirtual(), 2470 InitRange.getBegin(), 2471 BaseInit.takeAs<Expr>(), 2472 InitRange.getEnd(), EllipsisLoc); 2473} 2474 2475// Create a static_cast\<T&&>(expr). 2476static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2477 QualType ExprType = E->getType(); 2478 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2479 SourceLocation ExprLoc = E->getLocStart(); 2480 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2481 TargetType, ExprLoc); 2482 2483 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2484 SourceRange(ExprLoc, ExprLoc), 2485 E->getSourceRange()).take(); 2486} 2487 2488/// ImplicitInitializerKind - How an implicit base or member initializer should 2489/// initialize its base or member. 2490enum ImplicitInitializerKind { 2491 IIK_Default, 2492 IIK_Copy, 2493 IIK_Move 2494}; 2495 2496static bool 2497BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2498 ImplicitInitializerKind ImplicitInitKind, 2499 CXXBaseSpecifier *BaseSpec, 2500 bool IsInheritedVirtualBase, 2501 CXXCtorInitializer *&CXXBaseInit) { 2502 InitializedEntity InitEntity 2503 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2504 IsInheritedVirtualBase); 2505 2506 ExprResult BaseInit; 2507 2508 switch (ImplicitInitKind) { 2509 case IIK_Default: { 2510 InitializationKind InitKind 2511 = InitializationKind::CreateDefault(Constructor->getLocation()); 2512 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2513 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2514 break; 2515 } 2516 2517 case IIK_Move: 2518 case IIK_Copy: { 2519 bool Moving = ImplicitInitKind == IIK_Move; 2520 ParmVarDecl *Param = Constructor->getParamDecl(0); 2521 QualType ParamType = Param->getType().getNonReferenceType(); 2522 2523 Expr *CopyCtorArg = 2524 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2525 SourceLocation(), Param, false, 2526 Constructor->getLocation(), ParamType, 2527 VK_LValue, 0); 2528 2529 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2530 2531 // Cast to the base class to avoid ambiguities. 2532 QualType ArgTy = 2533 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2534 ParamType.getQualifiers()); 2535 2536 if (Moving) { 2537 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2538 } 2539 2540 CXXCastPath BasePath; 2541 BasePath.push_back(BaseSpec); 2542 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2543 CK_UncheckedDerivedToBase, 2544 Moving ? VK_XValue : VK_LValue, 2545 &BasePath).take(); 2546 2547 InitializationKind InitKind 2548 = InitializationKind::CreateDirect(Constructor->getLocation(), 2549 SourceLocation(), SourceLocation()); 2550 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2551 &CopyCtorArg, 1); 2552 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2553 MultiExprArg(&CopyCtorArg, 1)); 2554 break; 2555 } 2556 } 2557 2558 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2559 if (BaseInit.isInvalid()) 2560 return true; 2561 2562 CXXBaseInit = 2563 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2564 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2565 SourceLocation()), 2566 BaseSpec->isVirtual(), 2567 SourceLocation(), 2568 BaseInit.takeAs<Expr>(), 2569 SourceLocation(), 2570 SourceLocation()); 2571 2572 return false; 2573} 2574 2575static bool RefersToRValueRef(Expr *MemRef) { 2576 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2577 return Referenced->getType()->isRValueReferenceType(); 2578} 2579 2580static bool 2581BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2582 ImplicitInitializerKind ImplicitInitKind, 2583 FieldDecl *Field, IndirectFieldDecl *Indirect, 2584 CXXCtorInitializer *&CXXMemberInit) { 2585 if (Field->isInvalidDecl()) 2586 return true; 2587 2588 SourceLocation Loc = Constructor->getLocation(); 2589 2590 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2591 bool Moving = ImplicitInitKind == IIK_Move; 2592 ParmVarDecl *Param = Constructor->getParamDecl(0); 2593 QualType ParamType = Param->getType().getNonReferenceType(); 2594 2595 // Suppress copying zero-width bitfields. 2596 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2597 return false; 2598 2599 Expr *MemberExprBase = 2600 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2601 SourceLocation(), Param, false, 2602 Loc, ParamType, VK_LValue, 0); 2603 2604 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2605 2606 if (Moving) { 2607 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2608 } 2609 2610 // Build a reference to this field within the parameter. 2611 CXXScopeSpec SS; 2612 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2613 Sema::LookupMemberName); 2614 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2615 : cast<ValueDecl>(Field), AS_public); 2616 MemberLookup.resolveKind(); 2617 ExprResult CtorArg 2618 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2619 ParamType, Loc, 2620 /*IsArrow=*/false, 2621 SS, 2622 /*TemplateKWLoc=*/SourceLocation(), 2623 /*FirstQualifierInScope=*/0, 2624 MemberLookup, 2625 /*TemplateArgs=*/0); 2626 if (CtorArg.isInvalid()) 2627 return true; 2628 2629 // C++11 [class.copy]p15: 2630 // - if a member m has rvalue reference type T&&, it is direct-initialized 2631 // with static_cast<T&&>(x.m); 2632 if (RefersToRValueRef(CtorArg.get())) { 2633 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2634 } 2635 2636 // When the field we are copying is an array, create index variables for 2637 // each dimension of the array. We use these index variables to subscript 2638 // the source array, and other clients (e.g., CodeGen) will perform the 2639 // necessary iteration with these index variables. 2640 SmallVector<VarDecl *, 4> IndexVariables; 2641 QualType BaseType = Field->getType(); 2642 QualType SizeType = SemaRef.Context.getSizeType(); 2643 bool InitializingArray = false; 2644 while (const ConstantArrayType *Array 2645 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2646 InitializingArray = true; 2647 // Create the iteration variable for this array index. 2648 IdentifierInfo *IterationVarName = 0; 2649 { 2650 SmallString<8> Str; 2651 llvm::raw_svector_ostream OS(Str); 2652 OS << "__i" << IndexVariables.size(); 2653 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2654 } 2655 VarDecl *IterationVar 2656 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2657 IterationVarName, SizeType, 2658 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2659 SC_None, SC_None); 2660 IndexVariables.push_back(IterationVar); 2661 2662 // Create a reference to the iteration variable. 2663 ExprResult IterationVarRef 2664 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2665 assert(!IterationVarRef.isInvalid() && 2666 "Reference to invented variable cannot fail!"); 2667 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2668 assert(!IterationVarRef.isInvalid() && 2669 "Conversion of invented variable cannot fail!"); 2670 2671 // Subscript the array with this iteration variable. 2672 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2673 IterationVarRef.take(), 2674 Loc); 2675 if (CtorArg.isInvalid()) 2676 return true; 2677 2678 BaseType = Array->getElementType(); 2679 } 2680 2681 // The array subscript expression is an lvalue, which is wrong for moving. 2682 if (Moving && InitializingArray) 2683 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2684 2685 // Construct the entity that we will be initializing. For an array, this 2686 // will be first element in the array, which may require several levels 2687 // of array-subscript entities. 2688 SmallVector<InitializedEntity, 4> Entities; 2689 Entities.reserve(1 + IndexVariables.size()); 2690 if (Indirect) 2691 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2692 else 2693 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2694 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2695 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2696 0, 2697 Entities.back())); 2698 2699 // Direct-initialize to use the copy constructor. 2700 InitializationKind InitKind = 2701 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2702 2703 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2704 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2705 &CtorArgE, 1); 2706 2707 ExprResult MemberInit 2708 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2709 MultiExprArg(&CtorArgE, 1)); 2710 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2711 if (MemberInit.isInvalid()) 2712 return true; 2713 2714 if (Indirect) { 2715 assert(IndexVariables.size() == 0 && 2716 "Indirect field improperly initialized"); 2717 CXXMemberInit 2718 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2719 Loc, Loc, 2720 MemberInit.takeAs<Expr>(), 2721 Loc); 2722 } else 2723 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2724 Loc, MemberInit.takeAs<Expr>(), 2725 Loc, 2726 IndexVariables.data(), 2727 IndexVariables.size()); 2728 return false; 2729 } 2730 2731 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2732 2733 QualType FieldBaseElementType = 2734 SemaRef.Context.getBaseElementType(Field->getType()); 2735 2736 if (FieldBaseElementType->isRecordType()) { 2737 InitializedEntity InitEntity 2738 = Indirect? InitializedEntity::InitializeMember(Indirect) 2739 : InitializedEntity::InitializeMember(Field); 2740 InitializationKind InitKind = 2741 InitializationKind::CreateDefault(Loc); 2742 2743 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2744 ExprResult MemberInit = 2745 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2746 2747 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2748 if (MemberInit.isInvalid()) 2749 return true; 2750 2751 if (Indirect) 2752 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2753 Indirect, Loc, 2754 Loc, 2755 MemberInit.get(), 2756 Loc); 2757 else 2758 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2759 Field, Loc, Loc, 2760 MemberInit.get(), 2761 Loc); 2762 return false; 2763 } 2764 2765 if (!Field->getParent()->isUnion()) { 2766 if (FieldBaseElementType->isReferenceType()) { 2767 SemaRef.Diag(Constructor->getLocation(), 2768 diag::err_uninitialized_member_in_ctor) 2769 << (int)Constructor->isImplicit() 2770 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2771 << 0 << Field->getDeclName(); 2772 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2773 return true; 2774 } 2775 2776 if (FieldBaseElementType.isConstQualified()) { 2777 SemaRef.Diag(Constructor->getLocation(), 2778 diag::err_uninitialized_member_in_ctor) 2779 << (int)Constructor->isImplicit() 2780 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2781 << 1 << Field->getDeclName(); 2782 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2783 return true; 2784 } 2785 } 2786 2787 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2788 FieldBaseElementType->isObjCRetainableType() && 2789 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2790 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2791 // ARC: 2792 // Default-initialize Objective-C pointers to NULL. 2793 CXXMemberInit 2794 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2795 Loc, Loc, 2796 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2797 Loc); 2798 return false; 2799 } 2800 2801 // Nothing to initialize. 2802 CXXMemberInit = 0; 2803 return false; 2804} 2805 2806namespace { 2807struct BaseAndFieldInfo { 2808 Sema &S; 2809 CXXConstructorDecl *Ctor; 2810 bool AnyErrorsInInits; 2811 ImplicitInitializerKind IIK; 2812 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2813 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2814 2815 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2816 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2817 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2818 if (Generated && Ctor->isCopyConstructor()) 2819 IIK = IIK_Copy; 2820 else if (Generated && Ctor->isMoveConstructor()) 2821 IIK = IIK_Move; 2822 else 2823 IIK = IIK_Default; 2824 } 2825 2826 bool isImplicitCopyOrMove() const { 2827 switch (IIK) { 2828 case IIK_Copy: 2829 case IIK_Move: 2830 return true; 2831 2832 case IIK_Default: 2833 return false; 2834 } 2835 2836 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2837 } 2838 2839 bool addFieldInitializer(CXXCtorInitializer *Init) { 2840 AllToInit.push_back(Init); 2841 2842 // Check whether this initializer makes the field "used". 2843 if (Init->getInit() && Init->getInit()->HasSideEffects(S.Context)) 2844 S.UnusedPrivateFields.remove(Init->getAnyMember()); 2845 2846 return false; 2847 } 2848}; 2849} 2850 2851/// \brief Determine whether the given indirect field declaration is somewhere 2852/// within an anonymous union. 2853static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2854 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2855 CEnd = F->chain_end(); 2856 C != CEnd; ++C) 2857 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2858 if (Record->isUnion()) 2859 return true; 2860 2861 return false; 2862} 2863 2864/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2865/// array type. 2866static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2867 if (T->isIncompleteArrayType()) 2868 return true; 2869 2870 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2871 if (!ArrayT->getSize()) 2872 return true; 2873 2874 T = ArrayT->getElementType(); 2875 } 2876 2877 return false; 2878} 2879 2880static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2881 FieldDecl *Field, 2882 IndirectFieldDecl *Indirect = 0) { 2883 2884 // Overwhelmingly common case: we have a direct initializer for this field. 2885 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) 2886 return Info.addFieldInitializer(Init); 2887 2888 // C++11 [class.base.init]p8: if the entity is a non-static data member that 2889 // has a brace-or-equal-initializer, the entity is initialized as specified 2890 // in [dcl.init]. 2891 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2892 CXXCtorInitializer *Init; 2893 if (Indirect) 2894 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2895 SourceLocation(), 2896 SourceLocation(), 0, 2897 SourceLocation()); 2898 else 2899 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2900 SourceLocation(), 2901 SourceLocation(), 0, 2902 SourceLocation()); 2903 return Info.addFieldInitializer(Init); 2904 } 2905 2906 // Don't build an implicit initializer for union members if none was 2907 // explicitly specified. 2908 if (Field->getParent()->isUnion() || 2909 (Indirect && isWithinAnonymousUnion(Indirect))) 2910 return false; 2911 2912 // Don't initialize incomplete or zero-length arrays. 2913 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2914 return false; 2915 2916 // Don't try to build an implicit initializer if there were semantic 2917 // errors in any of the initializers (and therefore we might be 2918 // missing some that the user actually wrote). 2919 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2920 return false; 2921 2922 CXXCtorInitializer *Init = 0; 2923 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2924 Indirect, Init)) 2925 return true; 2926 2927 if (!Init) 2928 return false; 2929 2930 return Info.addFieldInitializer(Init); 2931} 2932 2933bool 2934Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2935 CXXCtorInitializer *Initializer) { 2936 assert(Initializer->isDelegatingInitializer()); 2937 Constructor->setNumCtorInitializers(1); 2938 CXXCtorInitializer **initializer = 2939 new (Context) CXXCtorInitializer*[1]; 2940 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2941 Constructor->setCtorInitializers(initializer); 2942 2943 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2944 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 2945 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2946 } 2947 2948 DelegatingCtorDecls.push_back(Constructor); 2949 2950 return false; 2951} 2952 2953bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2954 CXXCtorInitializer **Initializers, 2955 unsigned NumInitializers, 2956 bool AnyErrors) { 2957 if (Constructor->isDependentContext()) { 2958 // Just store the initializers as written, they will be checked during 2959 // instantiation. 2960 if (NumInitializers > 0) { 2961 Constructor->setNumCtorInitializers(NumInitializers); 2962 CXXCtorInitializer **baseOrMemberInitializers = 2963 new (Context) CXXCtorInitializer*[NumInitializers]; 2964 memcpy(baseOrMemberInitializers, Initializers, 2965 NumInitializers * sizeof(CXXCtorInitializer*)); 2966 Constructor->setCtorInitializers(baseOrMemberInitializers); 2967 } 2968 2969 // Let template instantiation know whether we had errors. 2970 if (AnyErrors) 2971 Constructor->setInvalidDecl(); 2972 2973 return false; 2974 } 2975 2976 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2977 2978 // We need to build the initializer AST according to order of construction 2979 // and not what user specified in the Initializers list. 2980 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2981 if (!ClassDecl) 2982 return true; 2983 2984 bool HadError = false; 2985 2986 for (unsigned i = 0; i < NumInitializers; i++) { 2987 CXXCtorInitializer *Member = Initializers[i]; 2988 2989 if (Member->isBaseInitializer()) 2990 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2991 else 2992 Info.AllBaseFields[Member->getAnyMember()] = Member; 2993 } 2994 2995 // Keep track of the direct virtual bases. 2996 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2997 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2998 E = ClassDecl->bases_end(); I != E; ++I) { 2999 if (I->isVirtual()) 3000 DirectVBases.insert(I); 3001 } 3002 3003 // Push virtual bases before others. 3004 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3005 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3006 3007 if (CXXCtorInitializer *Value 3008 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 3009 Info.AllToInit.push_back(Value); 3010 } else if (!AnyErrors) { 3011 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 3012 CXXCtorInitializer *CXXBaseInit; 3013 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3014 VBase, IsInheritedVirtualBase, 3015 CXXBaseInit)) { 3016 HadError = true; 3017 continue; 3018 } 3019 3020 Info.AllToInit.push_back(CXXBaseInit); 3021 } 3022 } 3023 3024 // Non-virtual bases. 3025 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3026 E = ClassDecl->bases_end(); Base != E; ++Base) { 3027 // Virtuals are in the virtual base list and already constructed. 3028 if (Base->isVirtual()) 3029 continue; 3030 3031 if (CXXCtorInitializer *Value 3032 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3033 Info.AllToInit.push_back(Value); 3034 } else if (!AnyErrors) { 3035 CXXCtorInitializer *CXXBaseInit; 3036 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3037 Base, /*IsInheritedVirtualBase=*/false, 3038 CXXBaseInit)) { 3039 HadError = true; 3040 continue; 3041 } 3042 3043 Info.AllToInit.push_back(CXXBaseInit); 3044 } 3045 } 3046 3047 // Fields. 3048 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3049 MemEnd = ClassDecl->decls_end(); 3050 Mem != MemEnd; ++Mem) { 3051 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3052 // C++ [class.bit]p2: 3053 // A declaration for a bit-field that omits the identifier declares an 3054 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3055 // initialized. 3056 if (F->isUnnamedBitfield()) 3057 continue; 3058 3059 // If we're not generating the implicit copy/move constructor, then we'll 3060 // handle anonymous struct/union fields based on their individual 3061 // indirect fields. 3062 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 3063 continue; 3064 3065 if (CollectFieldInitializer(*this, Info, F)) 3066 HadError = true; 3067 continue; 3068 } 3069 3070 // Beyond this point, we only consider default initialization. 3071 if (Info.IIK != IIK_Default) 3072 continue; 3073 3074 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3075 if (F->getType()->isIncompleteArrayType()) { 3076 assert(ClassDecl->hasFlexibleArrayMember() && 3077 "Incomplete array type is not valid"); 3078 continue; 3079 } 3080 3081 // Initialize each field of an anonymous struct individually. 3082 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3083 HadError = true; 3084 3085 continue; 3086 } 3087 } 3088 3089 NumInitializers = Info.AllToInit.size(); 3090 if (NumInitializers > 0) { 3091 Constructor->setNumCtorInitializers(NumInitializers); 3092 CXXCtorInitializer **baseOrMemberInitializers = 3093 new (Context) CXXCtorInitializer*[NumInitializers]; 3094 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3095 NumInitializers * sizeof(CXXCtorInitializer*)); 3096 Constructor->setCtorInitializers(baseOrMemberInitializers); 3097 3098 // Constructors implicitly reference the base and member 3099 // destructors. 3100 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3101 Constructor->getParent()); 3102 } 3103 3104 return HadError; 3105} 3106 3107static void *GetKeyForTopLevelField(FieldDecl *Field) { 3108 // For anonymous unions, use the class declaration as the key. 3109 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3110 if (RT->getDecl()->isAnonymousStructOrUnion()) 3111 return static_cast<void *>(RT->getDecl()); 3112 } 3113 return static_cast<void *>(Field); 3114} 3115 3116static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3117 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3118} 3119 3120static void *GetKeyForMember(ASTContext &Context, 3121 CXXCtorInitializer *Member) { 3122 if (!Member->isAnyMemberInitializer()) 3123 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3124 3125 // For fields injected into the class via declaration of an anonymous union, 3126 // use its anonymous union class declaration as the unique key. 3127 FieldDecl *Field = Member->getAnyMember(); 3128 3129 // If the field is a member of an anonymous struct or union, our key 3130 // is the anonymous record decl that's a direct child of the class. 3131 RecordDecl *RD = Field->getParent(); 3132 if (RD->isAnonymousStructOrUnion()) { 3133 while (true) { 3134 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3135 if (Parent->isAnonymousStructOrUnion()) 3136 RD = Parent; 3137 else 3138 break; 3139 } 3140 3141 return static_cast<void *>(RD); 3142 } 3143 3144 return static_cast<void *>(Field); 3145} 3146 3147static void 3148DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3149 const CXXConstructorDecl *Constructor, 3150 CXXCtorInitializer **Inits, 3151 unsigned NumInits) { 3152 if (Constructor->getDeclContext()->isDependentContext()) 3153 return; 3154 3155 // Don't check initializers order unless the warning is enabled at the 3156 // location of at least one initializer. 3157 bool ShouldCheckOrder = false; 3158 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3159 CXXCtorInitializer *Init = Inits[InitIndex]; 3160 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3161 Init->getSourceLocation()) 3162 != DiagnosticsEngine::Ignored) { 3163 ShouldCheckOrder = true; 3164 break; 3165 } 3166 } 3167 if (!ShouldCheckOrder) 3168 return; 3169 3170 // Build the list of bases and members in the order that they'll 3171 // actually be initialized. The explicit initializers should be in 3172 // this same order but may be missing things. 3173 SmallVector<const void*, 32> IdealInitKeys; 3174 3175 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3176 3177 // 1. Virtual bases. 3178 for (CXXRecordDecl::base_class_const_iterator VBase = 3179 ClassDecl->vbases_begin(), 3180 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3181 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3182 3183 // 2. Non-virtual bases. 3184 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3185 E = ClassDecl->bases_end(); Base != E; ++Base) { 3186 if (Base->isVirtual()) 3187 continue; 3188 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3189 } 3190 3191 // 3. Direct fields. 3192 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3193 E = ClassDecl->field_end(); Field != E; ++Field) { 3194 if (Field->isUnnamedBitfield()) 3195 continue; 3196 3197 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3198 } 3199 3200 unsigned NumIdealInits = IdealInitKeys.size(); 3201 unsigned IdealIndex = 0; 3202 3203 CXXCtorInitializer *PrevInit = 0; 3204 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3205 CXXCtorInitializer *Init = Inits[InitIndex]; 3206 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3207 3208 // Scan forward to try to find this initializer in the idealized 3209 // initializers list. 3210 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3211 if (InitKey == IdealInitKeys[IdealIndex]) 3212 break; 3213 3214 // If we didn't find this initializer, it must be because we 3215 // scanned past it on a previous iteration. That can only 3216 // happen if we're out of order; emit a warning. 3217 if (IdealIndex == NumIdealInits && PrevInit) { 3218 Sema::SemaDiagnosticBuilder D = 3219 SemaRef.Diag(PrevInit->getSourceLocation(), 3220 diag::warn_initializer_out_of_order); 3221 3222 if (PrevInit->isAnyMemberInitializer()) 3223 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3224 else 3225 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3226 3227 if (Init->isAnyMemberInitializer()) 3228 D << 0 << Init->getAnyMember()->getDeclName(); 3229 else 3230 D << 1 << Init->getTypeSourceInfo()->getType(); 3231 3232 // Move back to the initializer's location in the ideal list. 3233 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3234 if (InitKey == IdealInitKeys[IdealIndex]) 3235 break; 3236 3237 assert(IdealIndex != NumIdealInits && 3238 "initializer not found in initializer list"); 3239 } 3240 3241 PrevInit = Init; 3242 } 3243} 3244 3245namespace { 3246bool CheckRedundantInit(Sema &S, 3247 CXXCtorInitializer *Init, 3248 CXXCtorInitializer *&PrevInit) { 3249 if (!PrevInit) { 3250 PrevInit = Init; 3251 return false; 3252 } 3253 3254 if (FieldDecl *Field = Init->getMember()) 3255 S.Diag(Init->getSourceLocation(), 3256 diag::err_multiple_mem_initialization) 3257 << Field->getDeclName() 3258 << Init->getSourceRange(); 3259 else { 3260 const Type *BaseClass = Init->getBaseClass(); 3261 assert(BaseClass && "neither field nor base"); 3262 S.Diag(Init->getSourceLocation(), 3263 diag::err_multiple_base_initialization) 3264 << QualType(BaseClass, 0) 3265 << Init->getSourceRange(); 3266 } 3267 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3268 << 0 << PrevInit->getSourceRange(); 3269 3270 return true; 3271} 3272 3273typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3274typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3275 3276bool CheckRedundantUnionInit(Sema &S, 3277 CXXCtorInitializer *Init, 3278 RedundantUnionMap &Unions) { 3279 FieldDecl *Field = Init->getAnyMember(); 3280 RecordDecl *Parent = Field->getParent(); 3281 NamedDecl *Child = Field; 3282 3283 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3284 if (Parent->isUnion()) { 3285 UnionEntry &En = Unions[Parent]; 3286 if (En.first && En.first != Child) { 3287 S.Diag(Init->getSourceLocation(), 3288 diag::err_multiple_mem_union_initialization) 3289 << Field->getDeclName() 3290 << Init->getSourceRange(); 3291 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3292 << 0 << En.second->getSourceRange(); 3293 return true; 3294 } 3295 if (!En.first) { 3296 En.first = Child; 3297 En.second = Init; 3298 } 3299 if (!Parent->isAnonymousStructOrUnion()) 3300 return false; 3301 } 3302 3303 Child = Parent; 3304 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3305 } 3306 3307 return false; 3308} 3309} 3310 3311/// ActOnMemInitializers - Handle the member initializers for a constructor. 3312void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3313 SourceLocation ColonLoc, 3314 CXXCtorInitializer **meminits, 3315 unsigned NumMemInits, 3316 bool AnyErrors) { 3317 if (!ConstructorDecl) 3318 return; 3319 3320 AdjustDeclIfTemplate(ConstructorDecl); 3321 3322 CXXConstructorDecl *Constructor 3323 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3324 3325 if (!Constructor) { 3326 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3327 return; 3328 } 3329 3330 CXXCtorInitializer **MemInits = 3331 reinterpret_cast<CXXCtorInitializer **>(meminits); 3332 3333 // Mapping for the duplicate initializers check. 3334 // For member initializers, this is keyed with a FieldDecl*. 3335 // For base initializers, this is keyed with a Type*. 3336 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3337 3338 // Mapping for the inconsistent anonymous-union initializers check. 3339 RedundantUnionMap MemberUnions; 3340 3341 bool HadError = false; 3342 for (unsigned i = 0; i < NumMemInits; i++) { 3343 CXXCtorInitializer *Init = MemInits[i]; 3344 3345 // Set the source order index. 3346 Init->setSourceOrder(i); 3347 3348 if (Init->isAnyMemberInitializer()) { 3349 FieldDecl *Field = Init->getAnyMember(); 3350 if (CheckRedundantInit(*this, Init, Members[Field]) || 3351 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3352 HadError = true; 3353 } else if (Init->isBaseInitializer()) { 3354 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3355 if (CheckRedundantInit(*this, Init, Members[Key])) 3356 HadError = true; 3357 } else { 3358 assert(Init->isDelegatingInitializer()); 3359 // This must be the only initializer 3360 if (NumMemInits != 1) { 3361 Diag(Init->getSourceLocation(), 3362 diag::err_delegating_initializer_alone) 3363 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange(); 3364 // We will treat this as being the only initializer. 3365 } 3366 SetDelegatingInitializer(Constructor, MemInits[i]); 3367 // Return immediately as the initializer is set. 3368 return; 3369 } 3370 } 3371 3372 if (HadError) 3373 return; 3374 3375 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3376 3377 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3378} 3379 3380void 3381Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3382 CXXRecordDecl *ClassDecl) { 3383 // Ignore dependent contexts. Also ignore unions, since their members never 3384 // have destructors implicitly called. 3385 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3386 return; 3387 3388 // FIXME: all the access-control diagnostics are positioned on the 3389 // field/base declaration. That's probably good; that said, the 3390 // user might reasonably want to know why the destructor is being 3391 // emitted, and we currently don't say. 3392 3393 // Non-static data members. 3394 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3395 E = ClassDecl->field_end(); I != E; ++I) { 3396 FieldDecl *Field = *I; 3397 if (Field->isInvalidDecl()) 3398 continue; 3399 3400 // Don't destroy incomplete or zero-length arrays. 3401 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3402 continue; 3403 3404 QualType FieldType = Context.getBaseElementType(Field->getType()); 3405 3406 const RecordType* RT = FieldType->getAs<RecordType>(); 3407 if (!RT) 3408 continue; 3409 3410 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3411 if (FieldClassDecl->isInvalidDecl()) 3412 continue; 3413 if (FieldClassDecl->hasIrrelevantDestructor()) 3414 continue; 3415 // The destructor for an implicit anonymous union member is never invoked. 3416 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3417 continue; 3418 3419 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3420 assert(Dtor && "No dtor found for FieldClassDecl!"); 3421 CheckDestructorAccess(Field->getLocation(), Dtor, 3422 PDiag(diag::err_access_dtor_field) 3423 << Field->getDeclName() 3424 << FieldType); 3425 3426 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3427 DiagnoseUseOfDecl(Dtor, Location); 3428 } 3429 3430 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3431 3432 // Bases. 3433 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3434 E = ClassDecl->bases_end(); Base != E; ++Base) { 3435 // Bases are always records in a well-formed non-dependent class. 3436 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3437 3438 // Remember direct virtual bases. 3439 if (Base->isVirtual()) 3440 DirectVirtualBases.insert(RT); 3441 3442 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3443 // If our base class is invalid, we probably can't get its dtor anyway. 3444 if (BaseClassDecl->isInvalidDecl()) 3445 continue; 3446 if (BaseClassDecl->hasIrrelevantDestructor()) 3447 continue; 3448 3449 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3450 assert(Dtor && "No dtor found for BaseClassDecl!"); 3451 3452 // FIXME: caret should be on the start of the class name 3453 CheckDestructorAccess(Base->getLocStart(), Dtor, 3454 PDiag(diag::err_access_dtor_base) 3455 << Base->getType() 3456 << Base->getSourceRange(), 3457 Context.getTypeDeclType(ClassDecl)); 3458 3459 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3460 DiagnoseUseOfDecl(Dtor, Location); 3461 } 3462 3463 // Virtual bases. 3464 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3465 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3466 3467 // Bases are always records in a well-formed non-dependent class. 3468 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3469 3470 // Ignore direct virtual bases. 3471 if (DirectVirtualBases.count(RT)) 3472 continue; 3473 3474 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3475 // If our base class is invalid, we probably can't get its dtor anyway. 3476 if (BaseClassDecl->isInvalidDecl()) 3477 continue; 3478 if (BaseClassDecl->hasIrrelevantDestructor()) 3479 continue; 3480 3481 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3482 assert(Dtor && "No dtor found for BaseClassDecl!"); 3483 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3484 PDiag(diag::err_access_dtor_vbase) 3485 << VBase->getType(), 3486 Context.getTypeDeclType(ClassDecl)); 3487 3488 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3489 DiagnoseUseOfDecl(Dtor, Location); 3490 } 3491} 3492 3493void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3494 if (!CDtorDecl) 3495 return; 3496 3497 if (CXXConstructorDecl *Constructor 3498 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3499 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3500} 3501 3502bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3503 unsigned DiagID, AbstractDiagSelID SelID) { 3504 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3505 unsigned DiagID; 3506 AbstractDiagSelID SelID; 3507 3508 public: 3509 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3510 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3511 3512 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 3513 if (Suppressed) return; 3514 if (SelID == -1) 3515 S.Diag(Loc, DiagID) << T; 3516 else 3517 S.Diag(Loc, DiagID) << SelID << T; 3518 } 3519 } Diagnoser(DiagID, SelID); 3520 3521 return RequireNonAbstractType(Loc, T, Diagnoser); 3522} 3523 3524bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3525 TypeDiagnoser &Diagnoser) { 3526 if (!getLangOpts().CPlusPlus) 3527 return false; 3528 3529 if (const ArrayType *AT = Context.getAsArrayType(T)) 3530 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3531 3532 if (const PointerType *PT = T->getAs<PointerType>()) { 3533 // Find the innermost pointer type. 3534 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3535 PT = T; 3536 3537 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3538 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3539 } 3540 3541 const RecordType *RT = T->getAs<RecordType>(); 3542 if (!RT) 3543 return false; 3544 3545 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3546 3547 // We can't answer whether something is abstract until it has a 3548 // definition. If it's currently being defined, we'll walk back 3549 // over all the declarations when we have a full definition. 3550 const CXXRecordDecl *Def = RD->getDefinition(); 3551 if (!Def || Def->isBeingDefined()) 3552 return false; 3553 3554 if (!RD->isAbstract()) 3555 return false; 3556 3557 Diagnoser.diagnose(*this, Loc, T); 3558 DiagnoseAbstractType(RD); 3559 3560 return true; 3561} 3562 3563void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3564 // Check if we've already emitted the list of pure virtual functions 3565 // for this class. 3566 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3567 return; 3568 3569 CXXFinalOverriderMap FinalOverriders; 3570 RD->getFinalOverriders(FinalOverriders); 3571 3572 // Keep a set of seen pure methods so we won't diagnose the same method 3573 // more than once. 3574 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3575 3576 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3577 MEnd = FinalOverriders.end(); 3578 M != MEnd; 3579 ++M) { 3580 for (OverridingMethods::iterator SO = M->second.begin(), 3581 SOEnd = M->second.end(); 3582 SO != SOEnd; ++SO) { 3583 // C++ [class.abstract]p4: 3584 // A class is abstract if it contains or inherits at least one 3585 // pure virtual function for which the final overrider is pure 3586 // virtual. 3587 3588 // 3589 if (SO->second.size() != 1) 3590 continue; 3591 3592 if (!SO->second.front().Method->isPure()) 3593 continue; 3594 3595 if (!SeenPureMethods.insert(SO->second.front().Method)) 3596 continue; 3597 3598 Diag(SO->second.front().Method->getLocation(), 3599 diag::note_pure_virtual_function) 3600 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3601 } 3602 } 3603 3604 if (!PureVirtualClassDiagSet) 3605 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3606 PureVirtualClassDiagSet->insert(RD); 3607} 3608 3609namespace { 3610struct AbstractUsageInfo { 3611 Sema &S; 3612 CXXRecordDecl *Record; 3613 CanQualType AbstractType; 3614 bool Invalid; 3615 3616 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3617 : S(S), Record(Record), 3618 AbstractType(S.Context.getCanonicalType( 3619 S.Context.getTypeDeclType(Record))), 3620 Invalid(false) {} 3621 3622 void DiagnoseAbstractType() { 3623 if (Invalid) return; 3624 S.DiagnoseAbstractType(Record); 3625 Invalid = true; 3626 } 3627 3628 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3629}; 3630 3631struct CheckAbstractUsage { 3632 AbstractUsageInfo &Info; 3633 const NamedDecl *Ctx; 3634 3635 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3636 : Info(Info), Ctx(Ctx) {} 3637 3638 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3639 switch (TL.getTypeLocClass()) { 3640#define ABSTRACT_TYPELOC(CLASS, PARENT) 3641#define TYPELOC(CLASS, PARENT) \ 3642 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3643#include "clang/AST/TypeLocNodes.def" 3644 } 3645 } 3646 3647 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3648 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3649 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3650 if (!TL.getArg(I)) 3651 continue; 3652 3653 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3654 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3655 } 3656 } 3657 3658 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3659 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3660 } 3661 3662 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3663 // Visit the type parameters from a permissive context. 3664 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3665 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3666 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3667 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3668 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3669 // TODO: other template argument types? 3670 } 3671 } 3672 3673 // Visit pointee types from a permissive context. 3674#define CheckPolymorphic(Type) \ 3675 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3676 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3677 } 3678 CheckPolymorphic(PointerTypeLoc) 3679 CheckPolymorphic(ReferenceTypeLoc) 3680 CheckPolymorphic(MemberPointerTypeLoc) 3681 CheckPolymorphic(BlockPointerTypeLoc) 3682 CheckPolymorphic(AtomicTypeLoc) 3683 3684 /// Handle all the types we haven't given a more specific 3685 /// implementation for above. 3686 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3687 // Every other kind of type that we haven't called out already 3688 // that has an inner type is either (1) sugar or (2) contains that 3689 // inner type in some way as a subobject. 3690 if (TypeLoc Next = TL.getNextTypeLoc()) 3691 return Visit(Next, Sel); 3692 3693 // If there's no inner type and we're in a permissive context, 3694 // don't diagnose. 3695 if (Sel == Sema::AbstractNone) return; 3696 3697 // Check whether the type matches the abstract type. 3698 QualType T = TL.getType(); 3699 if (T->isArrayType()) { 3700 Sel = Sema::AbstractArrayType; 3701 T = Info.S.Context.getBaseElementType(T); 3702 } 3703 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3704 if (CT != Info.AbstractType) return; 3705 3706 // It matched; do some magic. 3707 if (Sel == Sema::AbstractArrayType) { 3708 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3709 << T << TL.getSourceRange(); 3710 } else { 3711 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3712 << Sel << T << TL.getSourceRange(); 3713 } 3714 Info.DiagnoseAbstractType(); 3715 } 3716}; 3717 3718void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3719 Sema::AbstractDiagSelID Sel) { 3720 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3721} 3722 3723} 3724 3725/// Check for invalid uses of an abstract type in a method declaration. 3726static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3727 CXXMethodDecl *MD) { 3728 // No need to do the check on definitions, which require that 3729 // the return/param types be complete. 3730 if (MD->doesThisDeclarationHaveABody()) 3731 return; 3732 3733 // For safety's sake, just ignore it if we don't have type source 3734 // information. This should never happen for non-implicit methods, 3735 // but... 3736 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3737 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3738} 3739 3740/// Check for invalid uses of an abstract type within a class definition. 3741static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3742 CXXRecordDecl *RD) { 3743 for (CXXRecordDecl::decl_iterator 3744 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3745 Decl *D = *I; 3746 if (D->isImplicit()) continue; 3747 3748 // Methods and method templates. 3749 if (isa<CXXMethodDecl>(D)) { 3750 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3751 } else if (isa<FunctionTemplateDecl>(D)) { 3752 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3753 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3754 3755 // Fields and static variables. 3756 } else if (isa<FieldDecl>(D)) { 3757 FieldDecl *FD = cast<FieldDecl>(D); 3758 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3759 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3760 } else if (isa<VarDecl>(D)) { 3761 VarDecl *VD = cast<VarDecl>(D); 3762 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3763 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3764 3765 // Nested classes and class templates. 3766 } else if (isa<CXXRecordDecl>(D)) { 3767 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3768 } else if (isa<ClassTemplateDecl>(D)) { 3769 CheckAbstractClassUsage(Info, 3770 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3771 } 3772 } 3773} 3774 3775/// \brief Perform semantic checks on a class definition that has been 3776/// completing, introducing implicitly-declared members, checking for 3777/// abstract types, etc. 3778void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3779 if (!Record) 3780 return; 3781 3782 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3783 AbstractUsageInfo Info(*this, Record); 3784 CheckAbstractClassUsage(Info, Record); 3785 } 3786 3787 // If this is not an aggregate type and has no user-declared constructor, 3788 // complain about any non-static data members of reference or const scalar 3789 // type, since they will never get initializers. 3790 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3791 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3792 !Record->isLambda()) { 3793 bool Complained = false; 3794 for (RecordDecl::field_iterator F = Record->field_begin(), 3795 FEnd = Record->field_end(); 3796 F != FEnd; ++F) { 3797 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3798 continue; 3799 3800 if (F->getType()->isReferenceType() || 3801 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3802 if (!Complained) { 3803 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3804 << Record->getTagKind() << Record; 3805 Complained = true; 3806 } 3807 3808 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3809 << F->getType()->isReferenceType() 3810 << F->getDeclName(); 3811 } 3812 } 3813 } 3814 3815 if (Record->isDynamicClass() && !Record->isDependentType()) 3816 DynamicClasses.push_back(Record); 3817 3818 if (Record->getIdentifier()) { 3819 // C++ [class.mem]p13: 3820 // If T is the name of a class, then each of the following shall have a 3821 // name different from T: 3822 // - every member of every anonymous union that is a member of class T. 3823 // 3824 // C++ [class.mem]p14: 3825 // In addition, if class T has a user-declared constructor (12.1), every 3826 // non-static data member of class T shall have a name different from T. 3827 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3828 R.first != R.second; ++R.first) { 3829 NamedDecl *D = *R.first; 3830 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3831 isa<IndirectFieldDecl>(D)) { 3832 Diag(D->getLocation(), diag::err_member_name_of_class) 3833 << D->getDeclName(); 3834 break; 3835 } 3836 } 3837 } 3838 3839 // Warn if the class has virtual methods but non-virtual public destructor. 3840 if (Record->isPolymorphic() && !Record->isDependentType()) { 3841 CXXDestructorDecl *dtor = Record->getDestructor(); 3842 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3843 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3844 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3845 } 3846 3847 if (Record->isAbstract() && Record->hasAttr<FinalAttr>()) { 3848 Diag(Record->getLocation(), diag::warn_abstract_final_class); 3849 DiagnoseAbstractType(Record); 3850 } 3851 3852 // See if a method overloads virtual methods in a base 3853 /// class without overriding any. 3854 if (!Record->isDependentType()) { 3855 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3856 MEnd = Record->method_end(); 3857 M != MEnd; ++M) { 3858 if (!M->isStatic()) 3859 DiagnoseHiddenVirtualMethods(Record, *M); 3860 } 3861 } 3862 3863 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3864 // function that is not a constructor declares that member function to be 3865 // const. [...] The class of which that function is a member shall be 3866 // a literal type. 3867 // 3868 // If the class has virtual bases, any constexpr members will already have 3869 // been diagnosed by the checks performed on the member declaration, so 3870 // suppress this (less useful) diagnostic. 3871 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3872 !Record->isLiteral() && !Record->getNumVBases()) { 3873 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3874 MEnd = Record->method_end(); 3875 M != MEnd; ++M) { 3876 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3877 switch (Record->getTemplateSpecializationKind()) { 3878 case TSK_ImplicitInstantiation: 3879 case TSK_ExplicitInstantiationDeclaration: 3880 case TSK_ExplicitInstantiationDefinition: 3881 // If a template instantiates to a non-literal type, but its members 3882 // instantiate to constexpr functions, the template is technically 3883 // ill-formed, but we allow it for sanity. 3884 continue; 3885 3886 case TSK_Undeclared: 3887 case TSK_ExplicitSpecialization: 3888 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 3889 diag::err_constexpr_method_non_literal); 3890 break; 3891 } 3892 3893 // Only produce one error per class. 3894 break; 3895 } 3896 } 3897 } 3898 3899 // Declare inherited constructors. We do this eagerly here because: 3900 // - The standard requires an eager diagnostic for conflicting inherited 3901 // constructors from different classes. 3902 // - The lazy declaration of the other implicit constructors is so as to not 3903 // waste space and performance on classes that are not meant to be 3904 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3905 // have inherited constructors. 3906 DeclareInheritedConstructors(Record); 3907} 3908 3909void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3910 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3911 ME = Record->method_end(); 3912 MI != ME; ++MI) 3913 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) 3914 CheckExplicitlyDefaultedSpecialMember(*MI); 3915} 3916 3917/// Is the special member function which would be selected to perform the 3918/// specified operation on the specified class type a constexpr constructor? 3919static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3920 Sema::CXXSpecialMember CSM, 3921 bool ConstArg) { 3922 Sema::SpecialMemberOverloadResult *SMOR = 3923 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 3924 false, false, false, false); 3925 if (!SMOR || !SMOR->getMethod()) 3926 // A constructor we wouldn't select can't be "involved in initializing" 3927 // anything. 3928 return true; 3929 return SMOR->getMethod()->isConstexpr(); 3930} 3931 3932/// Determine whether the specified special member function would be constexpr 3933/// if it were implicitly defined. 3934static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3935 Sema::CXXSpecialMember CSM, 3936 bool ConstArg) { 3937 if (!S.getLangOpts().CPlusPlus0x) 3938 return false; 3939 3940 // C++11 [dcl.constexpr]p4: 3941 // In the definition of a constexpr constructor [...] 3942 switch (CSM) { 3943 case Sema::CXXDefaultConstructor: 3944 // Since default constructor lookup is essentially trivial (and cannot 3945 // involve, for instance, template instantiation), we compute whether a 3946 // defaulted default constructor is constexpr directly within CXXRecordDecl. 3947 // 3948 // This is important for performance; we need to know whether the default 3949 // constructor is constexpr to determine whether the type is a literal type. 3950 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 3951 3952 case Sema::CXXCopyConstructor: 3953 case Sema::CXXMoveConstructor: 3954 // For copy or move constructors, we need to perform overload resolution. 3955 break; 3956 3957 case Sema::CXXCopyAssignment: 3958 case Sema::CXXMoveAssignment: 3959 case Sema::CXXDestructor: 3960 case Sema::CXXInvalid: 3961 return false; 3962 } 3963 3964 // -- if the class is a non-empty union, or for each non-empty anonymous 3965 // union member of a non-union class, exactly one non-static data member 3966 // shall be initialized; [DR1359] 3967 // 3968 // If we squint, this is guaranteed, since exactly one non-static data member 3969 // will be initialized (if the constructor isn't deleted), we just don't know 3970 // which one. 3971 if (ClassDecl->isUnion()) 3972 return true; 3973 3974 // -- the class shall not have any virtual base classes; 3975 if (ClassDecl->getNumVBases()) 3976 return false; 3977 3978 // -- every constructor involved in initializing [...] base class 3979 // sub-objects shall be a constexpr constructor; 3980 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 3981 BEnd = ClassDecl->bases_end(); 3982 B != BEnd; ++B) { 3983 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 3984 if (!BaseType) continue; 3985 3986 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 3987 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 3988 return false; 3989 } 3990 3991 // -- every constructor involved in initializing non-static data members 3992 // [...] shall be a constexpr constructor; 3993 // -- every non-static data member and base class sub-object shall be 3994 // initialized 3995 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 3996 FEnd = ClassDecl->field_end(); 3997 F != FEnd; ++F) { 3998 if (F->isInvalidDecl()) 3999 continue; 4000 if (const RecordType *RecordTy = 4001 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4002 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4003 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 4004 return false; 4005 } 4006 } 4007 4008 // All OK, it's constexpr! 4009 return true; 4010} 4011 4012static Sema::ImplicitExceptionSpecification 4013computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 4014 switch (S.getSpecialMember(MD)) { 4015 case Sema::CXXDefaultConstructor: 4016 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 4017 case Sema::CXXCopyConstructor: 4018 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 4019 case Sema::CXXCopyAssignment: 4020 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 4021 case Sema::CXXMoveConstructor: 4022 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 4023 case Sema::CXXMoveAssignment: 4024 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 4025 case Sema::CXXDestructor: 4026 return S.ComputeDefaultedDtorExceptionSpec(MD); 4027 case Sema::CXXInvalid: 4028 break; 4029 } 4030 llvm_unreachable("only special members have implicit exception specs"); 4031} 4032 4033static void 4034updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4035 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4036 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4037 ExceptSpec.getEPI(EPI); 4038 const FunctionProtoType *NewFPT = cast<FunctionProtoType>( 4039 S.Context.getFunctionType(FPT->getResultType(), FPT->arg_type_begin(), 4040 FPT->getNumArgs(), EPI)); 4041 FD->setType(QualType(NewFPT, 0)); 4042} 4043 4044void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4045 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4046 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4047 return; 4048 4049 // Evaluate the exception specification. 4050 ImplicitExceptionSpecification ExceptSpec = 4051 computeImplicitExceptionSpec(*this, Loc, MD); 4052 4053 // Update the type of the special member to use it. 4054 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4055 4056 // A user-provided destructor can be defined outside the class. When that 4057 // happens, be sure to update the exception specification on both 4058 // declarations. 4059 const FunctionProtoType *CanonicalFPT = 4060 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4061 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4062 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4063 CanonicalFPT, ExceptSpec); 4064} 4065 4066static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl); 4067static bool isImplicitCopyAssignmentArgConst(Sema &S, CXXRecordDecl *ClassDecl); 4068 4069void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4070 CXXRecordDecl *RD = MD->getParent(); 4071 CXXSpecialMember CSM = getSpecialMember(MD); 4072 4073 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4074 "not an explicitly-defaulted special member"); 4075 4076 // Whether this was the first-declared instance of the constructor. 4077 // This affects whether we implicitly add an exception spec and constexpr. 4078 bool First = MD == MD->getCanonicalDecl(); 4079 4080 bool HadError = false; 4081 4082 // C++11 [dcl.fct.def.default]p1: 4083 // A function that is explicitly defaulted shall 4084 // -- be a special member function (checked elsewhere), 4085 // -- have the same type (except for ref-qualifiers, and except that a 4086 // copy operation can take a non-const reference) as an implicit 4087 // declaration, and 4088 // -- not have default arguments. 4089 unsigned ExpectedParams = 1; 4090 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4091 ExpectedParams = 0; 4092 if (MD->getNumParams() != ExpectedParams) { 4093 // This also checks for default arguments: a copy or move constructor with a 4094 // default argument is classified as a default constructor, and assignment 4095 // operations and destructors can't have default arguments. 4096 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4097 << CSM << MD->getSourceRange(); 4098 HadError = true; 4099 } 4100 4101 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4102 4103 // Compute argument constness, constexpr, and triviality. 4104 bool CanHaveConstParam = false; 4105 bool Trivial = false; 4106 switch (CSM) { 4107 case CXXDefaultConstructor: 4108 Trivial = RD->hasTrivialDefaultConstructor(); 4109 break; 4110 case CXXCopyConstructor: 4111 CanHaveConstParam = isImplicitCopyCtorArgConst(*this, RD); 4112 Trivial = RD->hasTrivialCopyConstructor(); 4113 break; 4114 case CXXCopyAssignment: 4115 CanHaveConstParam = isImplicitCopyAssignmentArgConst(*this, RD); 4116 Trivial = RD->hasTrivialCopyAssignment(); 4117 break; 4118 case CXXMoveConstructor: 4119 Trivial = RD->hasTrivialMoveConstructor(); 4120 break; 4121 case CXXMoveAssignment: 4122 Trivial = RD->hasTrivialMoveAssignment(); 4123 break; 4124 case CXXDestructor: 4125 Trivial = RD->hasTrivialDestructor(); 4126 break; 4127 case CXXInvalid: 4128 llvm_unreachable("non-special member explicitly defaulted!"); 4129 } 4130 4131 QualType ReturnType = Context.VoidTy; 4132 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4133 // Check for return type matching. 4134 ReturnType = Type->getResultType(); 4135 QualType ExpectedReturnType = 4136 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4137 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4138 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4139 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4140 HadError = true; 4141 } 4142 4143 // A defaulted special member cannot have cv-qualifiers. 4144 if (Type->getTypeQuals()) { 4145 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4146 << (CSM == CXXMoveAssignment); 4147 HadError = true; 4148 } 4149 } 4150 4151 // Check for parameter type matching. 4152 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4153 bool HasConstParam = false; 4154 if (ExpectedParams && ArgType->isReferenceType()) { 4155 // Argument must be reference to possibly-const T. 4156 QualType ReferentType = ArgType->getPointeeType(); 4157 HasConstParam = ReferentType.isConstQualified(); 4158 4159 if (ReferentType.isVolatileQualified()) { 4160 Diag(MD->getLocation(), 4161 diag::err_defaulted_special_member_volatile_param) << CSM; 4162 HadError = true; 4163 } 4164 4165 if (HasConstParam && !CanHaveConstParam) { 4166 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4167 Diag(MD->getLocation(), 4168 diag::err_defaulted_special_member_copy_const_param) 4169 << (CSM == CXXCopyAssignment); 4170 // FIXME: Explain why this special member can't be const. 4171 } else { 4172 Diag(MD->getLocation(), 4173 diag::err_defaulted_special_member_move_const_param) 4174 << (CSM == CXXMoveAssignment); 4175 } 4176 HadError = true; 4177 } 4178 4179 // If a function is explicitly defaulted on its first declaration, it shall 4180 // have the same parameter type as if it had been implicitly declared. 4181 // (Presumably this is to prevent it from being trivial?) 4182 if (!HasConstParam && CanHaveConstParam && First) 4183 Diag(MD->getLocation(), 4184 diag::err_defaulted_special_member_copy_non_const_param) 4185 << (CSM == CXXCopyAssignment); 4186 } else if (ExpectedParams) { 4187 // A copy assignment operator can take its argument by value, but a 4188 // defaulted one cannot. 4189 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4190 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4191 HadError = true; 4192 } 4193 4194 // Rebuild the type with the implicit exception specification added, if we 4195 // are going to need it. 4196 const FunctionProtoType *ImplicitType = 0; 4197 if (First || Type->hasExceptionSpec()) { 4198 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4199 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4200 ImplicitType = cast<FunctionProtoType>( 4201 Context.getFunctionType(ReturnType, &ArgType, ExpectedParams, EPI)); 4202 } 4203 4204 // C++11 [dcl.fct.def.default]p2: 4205 // An explicitly-defaulted function may be declared constexpr only if it 4206 // would have been implicitly declared as constexpr, 4207 // Do not apply this rule to members of class templates, since core issue 1358 4208 // makes such functions always instantiate to constexpr functions. For 4209 // non-constructors, this is checked elsewhere. 4210 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4211 HasConstParam); 4212 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr && 4213 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4214 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4215 // FIXME: Explain why the constructor can't be constexpr. 4216 HadError = true; 4217 } 4218 // and may have an explicit exception-specification only if it is compatible 4219 // with the exception-specification on the implicit declaration. 4220 if (Type->hasExceptionSpec() && 4221 CheckEquivalentExceptionSpec( 4222 PDiag(diag::err_incorrect_defaulted_exception_spec) << CSM, 4223 PDiag(), ImplicitType, SourceLocation(), Type, MD->getLocation())) 4224 HadError = true; 4225 4226 // If a function is explicitly defaulted on its first declaration, 4227 if (First) { 4228 // -- it is implicitly considered to be constexpr if the implicit 4229 // definition would be, 4230 MD->setConstexpr(Constexpr); 4231 4232 // -- it is implicitly considered to have the same exception-specification 4233 // as if it had been implicitly declared, 4234 MD->setType(QualType(ImplicitType, 0)); 4235 4236 // Such a function is also trivial if the implicitly-declared function 4237 // would have been. 4238 MD->setTrivial(Trivial); 4239 } 4240 4241 if (ShouldDeleteSpecialMember(MD, CSM)) { 4242 if (First) { 4243 MD->setDeletedAsWritten(); 4244 } else { 4245 // C++11 [dcl.fct.def.default]p4: 4246 // [For a] user-provided explicitly-defaulted function [...] if such a 4247 // function is implicitly defined as deleted, the program is ill-formed. 4248 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4249 HadError = true; 4250 } 4251 } 4252 4253 if (HadError) 4254 MD->setInvalidDecl(); 4255} 4256 4257namespace { 4258struct SpecialMemberDeletionInfo { 4259 Sema &S; 4260 CXXMethodDecl *MD; 4261 Sema::CXXSpecialMember CSM; 4262 bool Diagnose; 4263 4264 // Properties of the special member, computed for convenience. 4265 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4266 SourceLocation Loc; 4267 4268 bool AllFieldsAreConst; 4269 4270 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4271 Sema::CXXSpecialMember CSM, bool Diagnose) 4272 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4273 IsConstructor(false), IsAssignment(false), IsMove(false), 4274 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4275 AllFieldsAreConst(true) { 4276 switch (CSM) { 4277 case Sema::CXXDefaultConstructor: 4278 case Sema::CXXCopyConstructor: 4279 IsConstructor = true; 4280 break; 4281 case Sema::CXXMoveConstructor: 4282 IsConstructor = true; 4283 IsMove = true; 4284 break; 4285 case Sema::CXXCopyAssignment: 4286 IsAssignment = true; 4287 break; 4288 case Sema::CXXMoveAssignment: 4289 IsAssignment = true; 4290 IsMove = true; 4291 break; 4292 case Sema::CXXDestructor: 4293 break; 4294 case Sema::CXXInvalid: 4295 llvm_unreachable("invalid special member kind"); 4296 } 4297 4298 if (MD->getNumParams()) { 4299 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4300 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4301 } 4302 } 4303 4304 bool inUnion() const { return MD->getParent()->isUnion(); } 4305 4306 /// Look up the corresponding special member in the given class. 4307 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4308 unsigned Quals) { 4309 unsigned TQ = MD->getTypeQualifiers(); 4310 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4311 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4312 Quals = 0; 4313 return S.LookupSpecialMember(Class, CSM, 4314 ConstArg || (Quals & Qualifiers::Const), 4315 VolatileArg || (Quals & Qualifiers::Volatile), 4316 MD->getRefQualifier() == RQ_RValue, 4317 TQ & Qualifiers::Const, 4318 TQ & Qualifiers::Volatile); 4319 } 4320 4321 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4322 4323 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4324 bool shouldDeleteForField(FieldDecl *FD); 4325 bool shouldDeleteForAllConstMembers(); 4326 4327 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4328 unsigned Quals); 4329 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4330 Sema::SpecialMemberOverloadResult *SMOR, 4331 bool IsDtorCallInCtor); 4332 4333 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4334}; 4335} 4336 4337/// Is the given special member inaccessible when used on the given 4338/// sub-object. 4339bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4340 CXXMethodDecl *target) { 4341 /// If we're operating on a base class, the object type is the 4342 /// type of this special member. 4343 QualType objectTy; 4344 AccessSpecifier access = target->getAccess(); 4345 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4346 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4347 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4348 4349 // If we're operating on a field, the object type is the type of the field. 4350 } else { 4351 objectTy = S.Context.getTypeDeclType(target->getParent()); 4352 } 4353 4354 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4355} 4356 4357/// Check whether we should delete a special member due to the implicit 4358/// definition containing a call to a special member of a subobject. 4359bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4360 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4361 bool IsDtorCallInCtor) { 4362 CXXMethodDecl *Decl = SMOR->getMethod(); 4363 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4364 4365 int DiagKind = -1; 4366 4367 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4368 DiagKind = !Decl ? 0 : 1; 4369 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4370 DiagKind = 2; 4371 else if (!isAccessible(Subobj, Decl)) 4372 DiagKind = 3; 4373 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4374 !Decl->isTrivial()) { 4375 // A member of a union must have a trivial corresponding special member. 4376 // As a weird special case, a destructor call from a union's constructor 4377 // must be accessible and non-deleted, but need not be trivial. Such a 4378 // destructor is never actually called, but is semantically checked as 4379 // if it were. 4380 DiagKind = 4; 4381 } 4382 4383 if (DiagKind == -1) 4384 return false; 4385 4386 if (Diagnose) { 4387 if (Field) { 4388 S.Diag(Field->getLocation(), 4389 diag::note_deleted_special_member_class_subobject) 4390 << CSM << MD->getParent() << /*IsField*/true 4391 << Field << DiagKind << IsDtorCallInCtor; 4392 } else { 4393 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4394 S.Diag(Base->getLocStart(), 4395 diag::note_deleted_special_member_class_subobject) 4396 << CSM << MD->getParent() << /*IsField*/false 4397 << Base->getType() << DiagKind << IsDtorCallInCtor; 4398 } 4399 4400 if (DiagKind == 1) 4401 S.NoteDeletedFunction(Decl); 4402 // FIXME: Explain inaccessibility if DiagKind == 3. 4403 } 4404 4405 return true; 4406} 4407 4408/// Check whether we should delete a special member function due to having a 4409/// direct or virtual base class or non-static data member of class type M. 4410bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4411 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 4412 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4413 4414 // C++11 [class.ctor]p5: 4415 // -- any direct or virtual base class, or non-static data member with no 4416 // brace-or-equal-initializer, has class type M (or array thereof) and 4417 // either M has no default constructor or overload resolution as applied 4418 // to M's default constructor results in an ambiguity or in a function 4419 // that is deleted or inaccessible 4420 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4421 // -- a direct or virtual base class B that cannot be copied/moved because 4422 // overload resolution, as applied to B's corresponding special member, 4423 // results in an ambiguity or a function that is deleted or inaccessible 4424 // from the defaulted special member 4425 // C++11 [class.dtor]p5: 4426 // -- any direct or virtual base class [...] has a type with a destructor 4427 // that is deleted or inaccessible 4428 if (!(CSM == Sema::CXXDefaultConstructor && 4429 Field && Field->hasInClassInitializer()) && 4430 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 4431 return true; 4432 4433 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4434 // -- any direct or virtual base class or non-static data member has a 4435 // type with a destructor that is deleted or inaccessible 4436 if (IsConstructor) { 4437 Sema::SpecialMemberOverloadResult *SMOR = 4438 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4439 false, false, false, false, false); 4440 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4441 return true; 4442 } 4443 4444 return false; 4445} 4446 4447/// Check whether we should delete a special member function due to the class 4448/// having a particular direct or virtual base class. 4449bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4450 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4451 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 4452} 4453 4454/// Check whether we should delete a special member function due to the class 4455/// having a particular non-static data member. 4456bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4457 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4458 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4459 4460 if (CSM == Sema::CXXDefaultConstructor) { 4461 // For a default constructor, all references must be initialized in-class 4462 // and, if a union, it must have a non-const member. 4463 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4464 if (Diagnose) 4465 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4466 << MD->getParent() << FD << FieldType << /*Reference*/0; 4467 return true; 4468 } 4469 // C++11 [class.ctor]p5: any non-variant non-static data member of 4470 // const-qualified type (or array thereof) with no 4471 // brace-or-equal-initializer does not have a user-provided default 4472 // constructor. 4473 if (!inUnion() && FieldType.isConstQualified() && 4474 !FD->hasInClassInitializer() && 4475 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4476 if (Diagnose) 4477 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4478 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4479 return true; 4480 } 4481 4482 if (inUnion() && !FieldType.isConstQualified()) 4483 AllFieldsAreConst = false; 4484 } else if (CSM == Sema::CXXCopyConstructor) { 4485 // For a copy constructor, data members must not be of rvalue reference 4486 // type. 4487 if (FieldType->isRValueReferenceType()) { 4488 if (Diagnose) 4489 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4490 << MD->getParent() << FD << FieldType; 4491 return true; 4492 } 4493 } else if (IsAssignment) { 4494 // For an assignment operator, data members must not be of reference type. 4495 if (FieldType->isReferenceType()) { 4496 if (Diagnose) 4497 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4498 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4499 return true; 4500 } 4501 if (!FieldRecord && FieldType.isConstQualified()) { 4502 // C++11 [class.copy]p23: 4503 // -- a non-static data member of const non-class type (or array thereof) 4504 if (Diagnose) 4505 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4506 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4507 return true; 4508 } 4509 } 4510 4511 if (FieldRecord) { 4512 // Some additional restrictions exist on the variant members. 4513 if (!inUnion() && FieldRecord->isUnion() && 4514 FieldRecord->isAnonymousStructOrUnion()) { 4515 bool AllVariantFieldsAreConst = true; 4516 4517 // FIXME: Handle anonymous unions declared within anonymous unions. 4518 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4519 UE = FieldRecord->field_end(); 4520 UI != UE; ++UI) { 4521 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4522 4523 if (!UnionFieldType.isConstQualified()) 4524 AllVariantFieldsAreConst = false; 4525 4526 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4527 if (UnionFieldRecord && 4528 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 4529 UnionFieldType.getCVRQualifiers())) 4530 return true; 4531 } 4532 4533 // At least one member in each anonymous union must be non-const 4534 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4535 FieldRecord->field_begin() != FieldRecord->field_end()) { 4536 if (Diagnose) 4537 S.Diag(FieldRecord->getLocation(), 4538 diag::note_deleted_default_ctor_all_const) 4539 << MD->getParent() << /*anonymous union*/1; 4540 return true; 4541 } 4542 4543 // Don't check the implicit member of the anonymous union type. 4544 // This is technically non-conformant, but sanity demands it. 4545 return false; 4546 } 4547 4548 if (shouldDeleteForClassSubobject(FieldRecord, FD, 4549 FieldType.getCVRQualifiers())) 4550 return true; 4551 } 4552 4553 return false; 4554} 4555 4556/// C++11 [class.ctor] p5: 4557/// A defaulted default constructor for a class X is defined as deleted if 4558/// X is a union and all of its variant members are of const-qualified type. 4559bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4560 // This is a silly definition, because it gives an empty union a deleted 4561 // default constructor. Don't do that. 4562 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4563 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4564 if (Diagnose) 4565 S.Diag(MD->getParent()->getLocation(), 4566 diag::note_deleted_default_ctor_all_const) 4567 << MD->getParent() << /*not anonymous union*/0; 4568 return true; 4569 } 4570 return false; 4571} 4572 4573/// Determine whether a defaulted special member function should be defined as 4574/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4575/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4576bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4577 bool Diagnose) { 4578 if (MD->isInvalidDecl()) 4579 return false; 4580 CXXRecordDecl *RD = MD->getParent(); 4581 assert(!RD->isDependentType() && "do deletion after instantiation"); 4582 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4583 return false; 4584 4585 // C++11 [expr.lambda.prim]p19: 4586 // The closure type associated with a lambda-expression has a 4587 // deleted (8.4.3) default constructor and a deleted copy 4588 // assignment operator. 4589 if (RD->isLambda() && 4590 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4591 if (Diagnose) 4592 Diag(RD->getLocation(), diag::note_lambda_decl); 4593 return true; 4594 } 4595 4596 // For an anonymous struct or union, the copy and assignment special members 4597 // will never be used, so skip the check. For an anonymous union declared at 4598 // namespace scope, the constructor and destructor are used. 4599 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4600 RD->isAnonymousStructOrUnion()) 4601 return false; 4602 4603 // C++11 [class.copy]p7, p18: 4604 // If the class definition declares a move constructor or move assignment 4605 // operator, an implicitly declared copy constructor or copy assignment 4606 // operator is defined as deleted. 4607 if (MD->isImplicit() && 4608 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4609 CXXMethodDecl *UserDeclaredMove = 0; 4610 4611 // In Microsoft mode, a user-declared move only causes the deletion of the 4612 // corresponding copy operation, not both copy operations. 4613 if (RD->hasUserDeclaredMoveConstructor() && 4614 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4615 if (!Diagnose) return true; 4616 UserDeclaredMove = RD->getMoveConstructor(); 4617 assert(UserDeclaredMove); 4618 } else if (RD->hasUserDeclaredMoveAssignment() && 4619 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4620 if (!Diagnose) return true; 4621 UserDeclaredMove = RD->getMoveAssignmentOperator(); 4622 assert(UserDeclaredMove); 4623 } 4624 4625 if (UserDeclaredMove) { 4626 Diag(UserDeclaredMove->getLocation(), 4627 diag::note_deleted_copy_user_declared_move) 4628 << (CSM == CXXCopyAssignment) << RD 4629 << UserDeclaredMove->isMoveAssignmentOperator(); 4630 return true; 4631 } 4632 } 4633 4634 // Do access control from the special member function 4635 ContextRAII MethodContext(*this, MD); 4636 4637 // C++11 [class.dtor]p5: 4638 // -- for a virtual destructor, lookup of the non-array deallocation function 4639 // results in an ambiguity or in a function that is deleted or inaccessible 4640 if (CSM == CXXDestructor && MD->isVirtual()) { 4641 FunctionDecl *OperatorDelete = 0; 4642 DeclarationName Name = 4643 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4644 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4645 OperatorDelete, false)) { 4646 if (Diagnose) 4647 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4648 return true; 4649 } 4650 } 4651 4652 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4653 4654 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4655 BE = RD->bases_end(); BI != BE; ++BI) 4656 if (!BI->isVirtual() && 4657 SMI.shouldDeleteForBase(BI)) 4658 return true; 4659 4660 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4661 BE = RD->vbases_end(); BI != BE; ++BI) 4662 if (SMI.shouldDeleteForBase(BI)) 4663 return true; 4664 4665 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4666 FE = RD->field_end(); FI != FE; ++FI) 4667 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4668 SMI.shouldDeleteForField(*FI)) 4669 return true; 4670 4671 if (SMI.shouldDeleteForAllConstMembers()) 4672 return true; 4673 4674 return false; 4675} 4676 4677/// \brief Data used with FindHiddenVirtualMethod 4678namespace { 4679 struct FindHiddenVirtualMethodData { 4680 Sema *S; 4681 CXXMethodDecl *Method; 4682 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4683 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4684 }; 4685} 4686 4687/// \brief Member lookup function that determines whether a given C++ 4688/// method overloads virtual methods in a base class without overriding any, 4689/// to be used with CXXRecordDecl::lookupInBases(). 4690static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4691 CXXBasePath &Path, 4692 void *UserData) { 4693 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4694 4695 FindHiddenVirtualMethodData &Data 4696 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4697 4698 DeclarationName Name = Data.Method->getDeclName(); 4699 assert(Name.getNameKind() == DeclarationName::Identifier); 4700 4701 bool foundSameNameMethod = false; 4702 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4703 for (Path.Decls = BaseRecord->lookup(Name); 4704 Path.Decls.first != Path.Decls.second; 4705 ++Path.Decls.first) { 4706 NamedDecl *D = *Path.Decls.first; 4707 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4708 MD = MD->getCanonicalDecl(); 4709 foundSameNameMethod = true; 4710 // Interested only in hidden virtual methods. 4711 if (!MD->isVirtual()) 4712 continue; 4713 // If the method we are checking overrides a method from its base 4714 // don't warn about the other overloaded methods. 4715 if (!Data.S->IsOverload(Data.Method, MD, false)) 4716 return true; 4717 // Collect the overload only if its hidden. 4718 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4719 overloadedMethods.push_back(MD); 4720 } 4721 } 4722 4723 if (foundSameNameMethod) 4724 Data.OverloadedMethods.append(overloadedMethods.begin(), 4725 overloadedMethods.end()); 4726 return foundSameNameMethod; 4727} 4728 4729/// \brief See if a method overloads virtual methods in a base class without 4730/// overriding any. 4731void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4732 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4733 MD->getLocation()) == DiagnosticsEngine::Ignored) 4734 return; 4735 if (!MD->getDeclName().isIdentifier()) 4736 return; 4737 4738 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4739 /*bool RecordPaths=*/false, 4740 /*bool DetectVirtual=*/false); 4741 FindHiddenVirtualMethodData Data; 4742 Data.Method = MD; 4743 Data.S = this; 4744 4745 // Keep the base methods that were overriden or introduced in the subclass 4746 // by 'using' in a set. A base method not in this set is hidden. 4747 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4748 res.first != res.second; ++res.first) { 4749 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4750 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4751 E = MD->end_overridden_methods(); 4752 I != E; ++I) 4753 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4754 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4755 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4756 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4757 } 4758 4759 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4760 !Data.OverloadedMethods.empty()) { 4761 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4762 << MD << (Data.OverloadedMethods.size() > 1); 4763 4764 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4765 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4766 Diag(overloadedMD->getLocation(), 4767 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4768 } 4769 } 4770} 4771 4772void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4773 Decl *TagDecl, 4774 SourceLocation LBrac, 4775 SourceLocation RBrac, 4776 AttributeList *AttrList) { 4777 if (!TagDecl) 4778 return; 4779 4780 AdjustDeclIfTemplate(TagDecl); 4781 4782 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 4783 if (l->getKind() != AttributeList::AT_Visibility) 4784 continue; 4785 l->setInvalid(); 4786 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 4787 l->getName(); 4788 } 4789 4790 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4791 // strict aliasing violation! 4792 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4793 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4794 4795 CheckCompletedCXXClass( 4796 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4797} 4798 4799/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4800/// special functions, such as the default constructor, copy 4801/// constructor, or destructor, to the given C++ class (C++ 4802/// [special]p1). This routine can only be executed just before the 4803/// definition of the class is complete. 4804void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4805 if (!ClassDecl->hasUserDeclaredConstructor()) 4806 ++ASTContext::NumImplicitDefaultConstructors; 4807 4808 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4809 ++ASTContext::NumImplicitCopyConstructors; 4810 4811 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4812 ++ASTContext::NumImplicitMoveConstructors; 4813 4814 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4815 ++ASTContext::NumImplicitCopyAssignmentOperators; 4816 4817 // If we have a dynamic class, then the copy assignment operator may be 4818 // virtual, so we have to declare it immediately. This ensures that, e.g., 4819 // it shows up in the right place in the vtable and that we diagnose 4820 // problems with the implicit exception specification. 4821 if (ClassDecl->isDynamicClass()) 4822 DeclareImplicitCopyAssignment(ClassDecl); 4823 } 4824 4825 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()) { 4826 ++ASTContext::NumImplicitMoveAssignmentOperators; 4827 4828 // Likewise for the move assignment operator. 4829 if (ClassDecl->isDynamicClass()) 4830 DeclareImplicitMoveAssignment(ClassDecl); 4831 } 4832 4833 if (!ClassDecl->hasUserDeclaredDestructor()) { 4834 ++ASTContext::NumImplicitDestructors; 4835 4836 // If we have a dynamic class, then the destructor may be virtual, so we 4837 // have to declare the destructor immediately. This ensures that, e.g., it 4838 // shows up in the right place in the vtable and that we diagnose problems 4839 // with the implicit exception specification. 4840 if (ClassDecl->isDynamicClass()) 4841 DeclareImplicitDestructor(ClassDecl); 4842 } 4843} 4844 4845void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4846 if (!D) 4847 return; 4848 4849 int NumParamList = D->getNumTemplateParameterLists(); 4850 for (int i = 0; i < NumParamList; i++) { 4851 TemplateParameterList* Params = D->getTemplateParameterList(i); 4852 for (TemplateParameterList::iterator Param = Params->begin(), 4853 ParamEnd = Params->end(); 4854 Param != ParamEnd; ++Param) { 4855 NamedDecl *Named = cast<NamedDecl>(*Param); 4856 if (Named->getDeclName()) { 4857 S->AddDecl(Named); 4858 IdResolver.AddDecl(Named); 4859 } 4860 } 4861 } 4862} 4863 4864void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4865 if (!D) 4866 return; 4867 4868 TemplateParameterList *Params = 0; 4869 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4870 Params = Template->getTemplateParameters(); 4871 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4872 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4873 Params = PartialSpec->getTemplateParameters(); 4874 else 4875 return; 4876 4877 for (TemplateParameterList::iterator Param = Params->begin(), 4878 ParamEnd = Params->end(); 4879 Param != ParamEnd; ++Param) { 4880 NamedDecl *Named = cast<NamedDecl>(*Param); 4881 if (Named->getDeclName()) { 4882 S->AddDecl(Named); 4883 IdResolver.AddDecl(Named); 4884 } 4885 } 4886} 4887 4888void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4889 if (!RecordD) return; 4890 AdjustDeclIfTemplate(RecordD); 4891 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4892 PushDeclContext(S, Record); 4893} 4894 4895void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4896 if (!RecordD) return; 4897 PopDeclContext(); 4898} 4899 4900/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4901/// parsing a top-level (non-nested) C++ class, and we are now 4902/// parsing those parts of the given Method declaration that could 4903/// not be parsed earlier (C++ [class.mem]p2), such as default 4904/// arguments. This action should enter the scope of the given 4905/// Method declaration as if we had just parsed the qualified method 4906/// name. However, it should not bring the parameters into scope; 4907/// that will be performed by ActOnDelayedCXXMethodParameter. 4908void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4909} 4910 4911/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4912/// C++ method declaration. We're (re-)introducing the given 4913/// function parameter into scope for use in parsing later parts of 4914/// the method declaration. For example, we could see an 4915/// ActOnParamDefaultArgument event for this parameter. 4916void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4917 if (!ParamD) 4918 return; 4919 4920 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4921 4922 // If this parameter has an unparsed default argument, clear it out 4923 // to make way for the parsed default argument. 4924 if (Param->hasUnparsedDefaultArg()) 4925 Param->setDefaultArg(0); 4926 4927 S->AddDecl(Param); 4928 if (Param->getDeclName()) 4929 IdResolver.AddDecl(Param); 4930} 4931 4932/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4933/// processing the delayed method declaration for Method. The method 4934/// declaration is now considered finished. There may be a separate 4935/// ActOnStartOfFunctionDef action later (not necessarily 4936/// immediately!) for this method, if it was also defined inside the 4937/// class body. 4938void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4939 if (!MethodD) 4940 return; 4941 4942 AdjustDeclIfTemplate(MethodD); 4943 4944 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4945 4946 // Now that we have our default arguments, check the constructor 4947 // again. It could produce additional diagnostics or affect whether 4948 // the class has implicitly-declared destructors, among other 4949 // things. 4950 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4951 CheckConstructor(Constructor); 4952 4953 // Check the default arguments, which we may have added. 4954 if (!Method->isInvalidDecl()) 4955 CheckCXXDefaultArguments(Method); 4956} 4957 4958/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4959/// the well-formedness of the constructor declarator @p D with type @p 4960/// R. If there are any errors in the declarator, this routine will 4961/// emit diagnostics and set the invalid bit to true. In any case, the type 4962/// will be updated to reflect a well-formed type for the constructor and 4963/// returned. 4964QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4965 StorageClass &SC) { 4966 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4967 4968 // C++ [class.ctor]p3: 4969 // A constructor shall not be virtual (10.3) or static (9.4). A 4970 // constructor can be invoked for a const, volatile or const 4971 // volatile object. A constructor shall not be declared const, 4972 // volatile, or const volatile (9.3.2). 4973 if (isVirtual) { 4974 if (!D.isInvalidType()) 4975 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4976 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4977 << SourceRange(D.getIdentifierLoc()); 4978 D.setInvalidType(); 4979 } 4980 if (SC == SC_Static) { 4981 if (!D.isInvalidType()) 4982 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4983 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4984 << SourceRange(D.getIdentifierLoc()); 4985 D.setInvalidType(); 4986 SC = SC_None; 4987 } 4988 4989 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4990 if (FTI.TypeQuals != 0) { 4991 if (FTI.TypeQuals & Qualifiers::Const) 4992 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4993 << "const" << SourceRange(D.getIdentifierLoc()); 4994 if (FTI.TypeQuals & Qualifiers::Volatile) 4995 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4996 << "volatile" << SourceRange(D.getIdentifierLoc()); 4997 if (FTI.TypeQuals & Qualifiers::Restrict) 4998 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4999 << "restrict" << SourceRange(D.getIdentifierLoc()); 5000 D.setInvalidType(); 5001 } 5002 5003 // C++0x [class.ctor]p4: 5004 // A constructor shall not be declared with a ref-qualifier. 5005 if (FTI.hasRefQualifier()) { 5006 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5007 << FTI.RefQualifierIsLValueRef 5008 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5009 D.setInvalidType(); 5010 } 5011 5012 // Rebuild the function type "R" without any type qualifiers (in 5013 // case any of the errors above fired) and with "void" as the 5014 // return type, since constructors don't have return types. 5015 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5016 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5017 return R; 5018 5019 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5020 EPI.TypeQuals = 0; 5021 EPI.RefQualifier = RQ_None; 5022 5023 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5024 Proto->getNumArgs(), EPI); 5025} 5026 5027/// CheckConstructor - Checks a fully-formed constructor for 5028/// well-formedness, issuing any diagnostics required. Returns true if 5029/// the constructor declarator is invalid. 5030void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5031 CXXRecordDecl *ClassDecl 5032 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5033 if (!ClassDecl) 5034 return Constructor->setInvalidDecl(); 5035 5036 // C++ [class.copy]p3: 5037 // A declaration of a constructor for a class X is ill-formed if 5038 // its first parameter is of type (optionally cv-qualified) X and 5039 // either there are no other parameters or else all other 5040 // parameters have default arguments. 5041 if (!Constructor->isInvalidDecl() && 5042 ((Constructor->getNumParams() == 1) || 5043 (Constructor->getNumParams() > 1 && 5044 Constructor->getParamDecl(1)->hasDefaultArg())) && 5045 Constructor->getTemplateSpecializationKind() 5046 != TSK_ImplicitInstantiation) { 5047 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5048 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5049 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5050 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5051 const char *ConstRef 5052 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5053 : " const &"; 5054 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5055 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5056 5057 // FIXME: Rather that making the constructor invalid, we should endeavor 5058 // to fix the type. 5059 Constructor->setInvalidDecl(); 5060 } 5061 } 5062} 5063 5064/// CheckDestructor - Checks a fully-formed destructor definition for 5065/// well-formedness, issuing any diagnostics required. Returns true 5066/// on error. 5067bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5068 CXXRecordDecl *RD = Destructor->getParent(); 5069 5070 if (Destructor->isVirtual()) { 5071 SourceLocation Loc; 5072 5073 if (!Destructor->isImplicit()) 5074 Loc = Destructor->getLocation(); 5075 else 5076 Loc = RD->getLocation(); 5077 5078 // If we have a virtual destructor, look up the deallocation function 5079 FunctionDecl *OperatorDelete = 0; 5080 DeclarationName Name = 5081 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5082 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5083 return true; 5084 5085 MarkFunctionReferenced(Loc, OperatorDelete); 5086 5087 Destructor->setOperatorDelete(OperatorDelete); 5088 } 5089 5090 return false; 5091} 5092 5093static inline bool 5094FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5095 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5096 FTI.ArgInfo[0].Param && 5097 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5098} 5099 5100/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5101/// the well-formednes of the destructor declarator @p D with type @p 5102/// R. If there are any errors in the declarator, this routine will 5103/// emit diagnostics and set the declarator to invalid. Even if this happens, 5104/// will be updated to reflect a well-formed type for the destructor and 5105/// returned. 5106QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5107 StorageClass& SC) { 5108 // C++ [class.dtor]p1: 5109 // [...] A typedef-name that names a class is a class-name 5110 // (7.1.3); however, a typedef-name that names a class shall not 5111 // be used as the identifier in the declarator for a destructor 5112 // declaration. 5113 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5114 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5115 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5116 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5117 else if (const TemplateSpecializationType *TST = 5118 DeclaratorType->getAs<TemplateSpecializationType>()) 5119 if (TST->isTypeAlias()) 5120 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5121 << DeclaratorType << 1; 5122 5123 // C++ [class.dtor]p2: 5124 // A destructor is used to destroy objects of its class type. A 5125 // destructor takes no parameters, and no return type can be 5126 // specified for it (not even void). The address of a destructor 5127 // shall not be taken. A destructor shall not be static. A 5128 // destructor can be invoked for a const, volatile or const 5129 // volatile object. A destructor shall not be declared const, 5130 // volatile or const volatile (9.3.2). 5131 if (SC == SC_Static) { 5132 if (!D.isInvalidType()) 5133 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5134 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5135 << SourceRange(D.getIdentifierLoc()) 5136 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5137 5138 SC = SC_None; 5139 } 5140 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5141 // Destructors don't have return types, but the parser will 5142 // happily parse something like: 5143 // 5144 // class X { 5145 // float ~X(); 5146 // }; 5147 // 5148 // The return type will be eliminated later. 5149 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5150 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5151 << SourceRange(D.getIdentifierLoc()); 5152 } 5153 5154 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5155 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5156 if (FTI.TypeQuals & Qualifiers::Const) 5157 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5158 << "const" << SourceRange(D.getIdentifierLoc()); 5159 if (FTI.TypeQuals & Qualifiers::Volatile) 5160 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5161 << "volatile" << SourceRange(D.getIdentifierLoc()); 5162 if (FTI.TypeQuals & Qualifiers::Restrict) 5163 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5164 << "restrict" << SourceRange(D.getIdentifierLoc()); 5165 D.setInvalidType(); 5166 } 5167 5168 // C++0x [class.dtor]p2: 5169 // A destructor shall not be declared with a ref-qualifier. 5170 if (FTI.hasRefQualifier()) { 5171 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5172 << FTI.RefQualifierIsLValueRef 5173 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5174 D.setInvalidType(); 5175 } 5176 5177 // Make sure we don't have any parameters. 5178 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5179 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5180 5181 // Delete the parameters. 5182 FTI.freeArgs(); 5183 D.setInvalidType(); 5184 } 5185 5186 // Make sure the destructor isn't variadic. 5187 if (FTI.isVariadic) { 5188 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5189 D.setInvalidType(); 5190 } 5191 5192 // Rebuild the function type "R" without any type qualifiers or 5193 // parameters (in case any of the errors above fired) and with 5194 // "void" as the return type, since destructors don't have return 5195 // types. 5196 if (!D.isInvalidType()) 5197 return R; 5198 5199 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5200 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5201 EPI.Variadic = false; 5202 EPI.TypeQuals = 0; 5203 EPI.RefQualifier = RQ_None; 5204 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5205} 5206 5207/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5208/// well-formednes of the conversion function declarator @p D with 5209/// type @p R. If there are any errors in the declarator, this routine 5210/// will emit diagnostics and return true. Otherwise, it will return 5211/// false. Either way, the type @p R will be updated to reflect a 5212/// well-formed type for the conversion operator. 5213void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5214 StorageClass& SC) { 5215 // C++ [class.conv.fct]p1: 5216 // Neither parameter types nor return type can be specified. The 5217 // type of a conversion function (8.3.5) is "function taking no 5218 // parameter returning conversion-type-id." 5219 if (SC == SC_Static) { 5220 if (!D.isInvalidType()) 5221 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5222 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5223 << SourceRange(D.getIdentifierLoc()); 5224 D.setInvalidType(); 5225 SC = SC_None; 5226 } 5227 5228 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5229 5230 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5231 // Conversion functions don't have return types, but the parser will 5232 // happily parse something like: 5233 // 5234 // class X { 5235 // float operator bool(); 5236 // }; 5237 // 5238 // The return type will be changed later anyway. 5239 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5240 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5241 << SourceRange(D.getIdentifierLoc()); 5242 D.setInvalidType(); 5243 } 5244 5245 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5246 5247 // Make sure we don't have any parameters. 5248 if (Proto->getNumArgs() > 0) { 5249 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5250 5251 // Delete the parameters. 5252 D.getFunctionTypeInfo().freeArgs(); 5253 D.setInvalidType(); 5254 } else if (Proto->isVariadic()) { 5255 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5256 D.setInvalidType(); 5257 } 5258 5259 // Diagnose "&operator bool()" and other such nonsense. This 5260 // is actually a gcc extension which we don't support. 5261 if (Proto->getResultType() != ConvType) { 5262 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5263 << Proto->getResultType(); 5264 D.setInvalidType(); 5265 ConvType = Proto->getResultType(); 5266 } 5267 5268 // C++ [class.conv.fct]p4: 5269 // The conversion-type-id shall not represent a function type nor 5270 // an array type. 5271 if (ConvType->isArrayType()) { 5272 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5273 ConvType = Context.getPointerType(ConvType); 5274 D.setInvalidType(); 5275 } else if (ConvType->isFunctionType()) { 5276 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5277 ConvType = Context.getPointerType(ConvType); 5278 D.setInvalidType(); 5279 } 5280 5281 // Rebuild the function type "R" without any parameters (in case any 5282 // of the errors above fired) and with the conversion type as the 5283 // return type. 5284 if (D.isInvalidType()) 5285 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5286 5287 // C++0x explicit conversion operators. 5288 if (D.getDeclSpec().isExplicitSpecified()) 5289 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5290 getLangOpts().CPlusPlus0x ? 5291 diag::warn_cxx98_compat_explicit_conversion_functions : 5292 diag::ext_explicit_conversion_functions) 5293 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5294} 5295 5296/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5297/// the declaration of the given C++ conversion function. This routine 5298/// is responsible for recording the conversion function in the C++ 5299/// class, if possible. 5300Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5301 assert(Conversion && "Expected to receive a conversion function declaration"); 5302 5303 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5304 5305 // Make sure we aren't redeclaring the conversion function. 5306 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5307 5308 // C++ [class.conv.fct]p1: 5309 // [...] A conversion function is never used to convert a 5310 // (possibly cv-qualified) object to the (possibly cv-qualified) 5311 // same object type (or a reference to it), to a (possibly 5312 // cv-qualified) base class of that type (or a reference to it), 5313 // or to (possibly cv-qualified) void. 5314 // FIXME: Suppress this warning if the conversion function ends up being a 5315 // virtual function that overrides a virtual function in a base class. 5316 QualType ClassType 5317 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5318 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5319 ConvType = ConvTypeRef->getPointeeType(); 5320 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5321 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5322 /* Suppress diagnostics for instantiations. */; 5323 else if (ConvType->isRecordType()) { 5324 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5325 if (ConvType == ClassType) 5326 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5327 << ClassType; 5328 else if (IsDerivedFrom(ClassType, ConvType)) 5329 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5330 << ClassType << ConvType; 5331 } else if (ConvType->isVoidType()) { 5332 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5333 << ClassType << ConvType; 5334 } 5335 5336 if (FunctionTemplateDecl *ConversionTemplate 5337 = Conversion->getDescribedFunctionTemplate()) 5338 return ConversionTemplate; 5339 5340 return Conversion; 5341} 5342 5343//===----------------------------------------------------------------------===// 5344// Namespace Handling 5345//===----------------------------------------------------------------------===// 5346 5347 5348 5349/// ActOnStartNamespaceDef - This is called at the start of a namespace 5350/// definition. 5351Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5352 SourceLocation InlineLoc, 5353 SourceLocation NamespaceLoc, 5354 SourceLocation IdentLoc, 5355 IdentifierInfo *II, 5356 SourceLocation LBrace, 5357 AttributeList *AttrList) { 5358 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5359 // For anonymous namespace, take the location of the left brace. 5360 SourceLocation Loc = II ? IdentLoc : LBrace; 5361 bool IsInline = InlineLoc.isValid(); 5362 bool IsInvalid = false; 5363 bool IsStd = false; 5364 bool AddToKnown = false; 5365 Scope *DeclRegionScope = NamespcScope->getParent(); 5366 5367 NamespaceDecl *PrevNS = 0; 5368 if (II) { 5369 // C++ [namespace.def]p2: 5370 // The identifier in an original-namespace-definition shall not 5371 // have been previously defined in the declarative region in 5372 // which the original-namespace-definition appears. The 5373 // identifier in an original-namespace-definition is the name of 5374 // the namespace. Subsequently in that declarative region, it is 5375 // treated as an original-namespace-name. 5376 // 5377 // Since namespace names are unique in their scope, and we don't 5378 // look through using directives, just look for any ordinary names. 5379 5380 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5381 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5382 Decl::IDNS_Namespace; 5383 NamedDecl *PrevDecl = 0; 5384 for (DeclContext::lookup_result R 5385 = CurContext->getRedeclContext()->lookup(II); 5386 R.first != R.second; ++R.first) { 5387 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5388 PrevDecl = *R.first; 5389 break; 5390 } 5391 } 5392 5393 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5394 5395 if (PrevNS) { 5396 // This is an extended namespace definition. 5397 if (IsInline != PrevNS->isInline()) { 5398 // inline-ness must match 5399 if (PrevNS->isInline()) { 5400 // The user probably just forgot the 'inline', so suggest that it 5401 // be added back. 5402 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5403 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5404 } else { 5405 Diag(Loc, diag::err_inline_namespace_mismatch) 5406 << IsInline; 5407 } 5408 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5409 5410 IsInline = PrevNS->isInline(); 5411 } 5412 } else if (PrevDecl) { 5413 // This is an invalid name redefinition. 5414 Diag(Loc, diag::err_redefinition_different_kind) 5415 << II; 5416 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5417 IsInvalid = true; 5418 // Continue on to push Namespc as current DeclContext and return it. 5419 } else if (II->isStr("std") && 5420 CurContext->getRedeclContext()->isTranslationUnit()) { 5421 // This is the first "real" definition of the namespace "std", so update 5422 // our cache of the "std" namespace to point at this definition. 5423 PrevNS = getStdNamespace(); 5424 IsStd = true; 5425 AddToKnown = !IsInline; 5426 } else { 5427 // We've seen this namespace for the first time. 5428 AddToKnown = !IsInline; 5429 } 5430 } else { 5431 // Anonymous namespaces. 5432 5433 // Determine whether the parent already has an anonymous namespace. 5434 DeclContext *Parent = CurContext->getRedeclContext(); 5435 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5436 PrevNS = TU->getAnonymousNamespace(); 5437 } else { 5438 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5439 PrevNS = ND->getAnonymousNamespace(); 5440 } 5441 5442 if (PrevNS && IsInline != PrevNS->isInline()) { 5443 // inline-ness must match 5444 Diag(Loc, diag::err_inline_namespace_mismatch) 5445 << IsInline; 5446 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5447 5448 // Recover by ignoring the new namespace's inline status. 5449 IsInline = PrevNS->isInline(); 5450 } 5451 } 5452 5453 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5454 StartLoc, Loc, II, PrevNS); 5455 if (IsInvalid) 5456 Namespc->setInvalidDecl(); 5457 5458 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5459 5460 // FIXME: Should we be merging attributes? 5461 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5462 PushNamespaceVisibilityAttr(Attr, Loc); 5463 5464 if (IsStd) 5465 StdNamespace = Namespc; 5466 if (AddToKnown) 5467 KnownNamespaces[Namespc] = false; 5468 5469 if (II) { 5470 PushOnScopeChains(Namespc, DeclRegionScope); 5471 } else { 5472 // Link the anonymous namespace into its parent. 5473 DeclContext *Parent = CurContext->getRedeclContext(); 5474 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5475 TU->setAnonymousNamespace(Namespc); 5476 } else { 5477 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5478 } 5479 5480 CurContext->addDecl(Namespc); 5481 5482 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5483 // behaves as if it were replaced by 5484 // namespace unique { /* empty body */ } 5485 // using namespace unique; 5486 // namespace unique { namespace-body } 5487 // where all occurrences of 'unique' in a translation unit are 5488 // replaced by the same identifier and this identifier differs 5489 // from all other identifiers in the entire program. 5490 5491 // We just create the namespace with an empty name and then add an 5492 // implicit using declaration, just like the standard suggests. 5493 // 5494 // CodeGen enforces the "universally unique" aspect by giving all 5495 // declarations semantically contained within an anonymous 5496 // namespace internal linkage. 5497 5498 if (!PrevNS) { 5499 UsingDirectiveDecl* UD 5500 = UsingDirectiveDecl::Create(Context, CurContext, 5501 /* 'using' */ LBrace, 5502 /* 'namespace' */ SourceLocation(), 5503 /* qualifier */ NestedNameSpecifierLoc(), 5504 /* identifier */ SourceLocation(), 5505 Namespc, 5506 /* Ancestor */ CurContext); 5507 UD->setImplicit(); 5508 CurContext->addDecl(UD); 5509 } 5510 } 5511 5512 ActOnDocumentableDecl(Namespc); 5513 5514 // Although we could have an invalid decl (i.e. the namespace name is a 5515 // redefinition), push it as current DeclContext and try to continue parsing. 5516 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5517 // for the namespace has the declarations that showed up in that particular 5518 // namespace definition. 5519 PushDeclContext(NamespcScope, Namespc); 5520 return Namespc; 5521} 5522 5523/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5524/// is a namespace alias, returns the namespace it points to. 5525static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5526 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5527 return AD->getNamespace(); 5528 return dyn_cast_or_null<NamespaceDecl>(D); 5529} 5530 5531/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5532/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5533void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5534 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5535 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5536 Namespc->setRBraceLoc(RBrace); 5537 PopDeclContext(); 5538 if (Namespc->hasAttr<VisibilityAttr>()) 5539 PopPragmaVisibility(true, RBrace); 5540} 5541 5542CXXRecordDecl *Sema::getStdBadAlloc() const { 5543 return cast_or_null<CXXRecordDecl>( 5544 StdBadAlloc.get(Context.getExternalSource())); 5545} 5546 5547NamespaceDecl *Sema::getStdNamespace() const { 5548 return cast_or_null<NamespaceDecl>( 5549 StdNamespace.get(Context.getExternalSource())); 5550} 5551 5552/// \brief Retrieve the special "std" namespace, which may require us to 5553/// implicitly define the namespace. 5554NamespaceDecl *Sema::getOrCreateStdNamespace() { 5555 if (!StdNamespace) { 5556 // The "std" namespace has not yet been defined, so build one implicitly. 5557 StdNamespace = NamespaceDecl::Create(Context, 5558 Context.getTranslationUnitDecl(), 5559 /*Inline=*/false, 5560 SourceLocation(), SourceLocation(), 5561 &PP.getIdentifierTable().get("std"), 5562 /*PrevDecl=*/0); 5563 getStdNamespace()->setImplicit(true); 5564 } 5565 5566 return getStdNamespace(); 5567} 5568 5569bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5570 assert(getLangOpts().CPlusPlus && 5571 "Looking for std::initializer_list outside of C++."); 5572 5573 // We're looking for implicit instantiations of 5574 // template <typename E> class std::initializer_list. 5575 5576 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5577 return false; 5578 5579 ClassTemplateDecl *Template = 0; 5580 const TemplateArgument *Arguments = 0; 5581 5582 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5583 5584 ClassTemplateSpecializationDecl *Specialization = 5585 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5586 if (!Specialization) 5587 return false; 5588 5589 Template = Specialization->getSpecializedTemplate(); 5590 Arguments = Specialization->getTemplateArgs().data(); 5591 } else if (const TemplateSpecializationType *TST = 5592 Ty->getAs<TemplateSpecializationType>()) { 5593 Template = dyn_cast_or_null<ClassTemplateDecl>( 5594 TST->getTemplateName().getAsTemplateDecl()); 5595 Arguments = TST->getArgs(); 5596 } 5597 if (!Template) 5598 return false; 5599 5600 if (!StdInitializerList) { 5601 // Haven't recognized std::initializer_list yet, maybe this is it. 5602 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5603 if (TemplateClass->getIdentifier() != 5604 &PP.getIdentifierTable().get("initializer_list") || 5605 !getStdNamespace()->InEnclosingNamespaceSetOf( 5606 TemplateClass->getDeclContext())) 5607 return false; 5608 // This is a template called std::initializer_list, but is it the right 5609 // template? 5610 TemplateParameterList *Params = Template->getTemplateParameters(); 5611 if (Params->getMinRequiredArguments() != 1) 5612 return false; 5613 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5614 return false; 5615 5616 // It's the right template. 5617 StdInitializerList = Template; 5618 } 5619 5620 if (Template != StdInitializerList) 5621 return false; 5622 5623 // This is an instance of std::initializer_list. Find the argument type. 5624 if (Element) 5625 *Element = Arguments[0].getAsType(); 5626 return true; 5627} 5628 5629static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5630 NamespaceDecl *Std = S.getStdNamespace(); 5631 if (!Std) { 5632 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5633 return 0; 5634 } 5635 5636 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5637 Loc, Sema::LookupOrdinaryName); 5638 if (!S.LookupQualifiedName(Result, Std)) { 5639 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5640 return 0; 5641 } 5642 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5643 if (!Template) { 5644 Result.suppressDiagnostics(); 5645 // We found something weird. Complain about the first thing we found. 5646 NamedDecl *Found = *Result.begin(); 5647 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5648 return 0; 5649 } 5650 5651 // We found some template called std::initializer_list. Now verify that it's 5652 // correct. 5653 TemplateParameterList *Params = Template->getTemplateParameters(); 5654 if (Params->getMinRequiredArguments() != 1 || 5655 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5656 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5657 return 0; 5658 } 5659 5660 return Template; 5661} 5662 5663QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5664 if (!StdInitializerList) { 5665 StdInitializerList = LookupStdInitializerList(*this, Loc); 5666 if (!StdInitializerList) 5667 return QualType(); 5668 } 5669 5670 TemplateArgumentListInfo Args(Loc, Loc); 5671 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5672 Context.getTrivialTypeSourceInfo(Element, 5673 Loc))); 5674 return Context.getCanonicalType( 5675 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5676} 5677 5678bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5679 // C++ [dcl.init.list]p2: 5680 // A constructor is an initializer-list constructor if its first parameter 5681 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5682 // std::initializer_list<E> for some type E, and either there are no other 5683 // parameters or else all other parameters have default arguments. 5684 if (Ctor->getNumParams() < 1 || 5685 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5686 return false; 5687 5688 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5689 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5690 ArgType = RT->getPointeeType().getUnqualifiedType(); 5691 5692 return isStdInitializerList(ArgType, 0); 5693} 5694 5695/// \brief Determine whether a using statement is in a context where it will be 5696/// apply in all contexts. 5697static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5698 switch (CurContext->getDeclKind()) { 5699 case Decl::TranslationUnit: 5700 return true; 5701 case Decl::LinkageSpec: 5702 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5703 default: 5704 return false; 5705 } 5706} 5707 5708namespace { 5709 5710// Callback to only accept typo corrections that are namespaces. 5711class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5712 public: 5713 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5714 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5715 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5716 } 5717 return false; 5718 } 5719}; 5720 5721} 5722 5723static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5724 CXXScopeSpec &SS, 5725 SourceLocation IdentLoc, 5726 IdentifierInfo *Ident) { 5727 NamespaceValidatorCCC Validator; 5728 R.clear(); 5729 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5730 R.getLookupKind(), Sc, &SS, 5731 Validator)) { 5732 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 5733 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 5734 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5735 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5736 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5737 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5738 else 5739 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5740 << Ident << CorrectedQuotedStr 5741 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5742 5743 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5744 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5745 5746 R.addDecl(Corrected.getCorrectionDecl()); 5747 return true; 5748 } 5749 return false; 5750} 5751 5752Decl *Sema::ActOnUsingDirective(Scope *S, 5753 SourceLocation UsingLoc, 5754 SourceLocation NamespcLoc, 5755 CXXScopeSpec &SS, 5756 SourceLocation IdentLoc, 5757 IdentifierInfo *NamespcName, 5758 AttributeList *AttrList) { 5759 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5760 assert(NamespcName && "Invalid NamespcName."); 5761 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5762 5763 // This can only happen along a recovery path. 5764 while (S->getFlags() & Scope::TemplateParamScope) 5765 S = S->getParent(); 5766 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5767 5768 UsingDirectiveDecl *UDir = 0; 5769 NestedNameSpecifier *Qualifier = 0; 5770 if (SS.isSet()) 5771 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5772 5773 // Lookup namespace name. 5774 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5775 LookupParsedName(R, S, &SS); 5776 if (R.isAmbiguous()) 5777 return 0; 5778 5779 if (R.empty()) { 5780 R.clear(); 5781 // Allow "using namespace std;" or "using namespace ::std;" even if 5782 // "std" hasn't been defined yet, for GCC compatibility. 5783 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5784 NamespcName->isStr("std")) { 5785 Diag(IdentLoc, diag::ext_using_undefined_std); 5786 R.addDecl(getOrCreateStdNamespace()); 5787 R.resolveKind(); 5788 } 5789 // Otherwise, attempt typo correction. 5790 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5791 } 5792 5793 if (!R.empty()) { 5794 NamedDecl *Named = R.getFoundDecl(); 5795 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5796 && "expected namespace decl"); 5797 // C++ [namespace.udir]p1: 5798 // A using-directive specifies that the names in the nominated 5799 // namespace can be used in the scope in which the 5800 // using-directive appears after the using-directive. During 5801 // unqualified name lookup (3.4.1), the names appear as if they 5802 // were declared in the nearest enclosing namespace which 5803 // contains both the using-directive and the nominated 5804 // namespace. [Note: in this context, "contains" means "contains 5805 // directly or indirectly". ] 5806 5807 // Find enclosing context containing both using-directive and 5808 // nominated namespace. 5809 NamespaceDecl *NS = getNamespaceDecl(Named); 5810 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5811 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5812 CommonAncestor = CommonAncestor->getParent(); 5813 5814 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5815 SS.getWithLocInContext(Context), 5816 IdentLoc, Named, CommonAncestor); 5817 5818 if (IsUsingDirectiveInToplevelContext(CurContext) && 5819 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5820 Diag(IdentLoc, diag::warn_using_directive_in_header); 5821 } 5822 5823 PushUsingDirective(S, UDir); 5824 } else { 5825 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5826 } 5827 5828 // FIXME: We ignore attributes for now. 5829 return UDir; 5830} 5831 5832void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5833 // If the scope has an associated entity and the using directive is at 5834 // namespace or translation unit scope, add the UsingDirectiveDecl into 5835 // its lookup structure so qualified name lookup can find it. 5836 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 5837 if (Ctx && !Ctx->isFunctionOrMethod()) 5838 Ctx->addDecl(UDir); 5839 else 5840 // Otherwise, it is at block sope. The using-directives will affect lookup 5841 // only to the end of the scope. 5842 S->PushUsingDirective(UDir); 5843} 5844 5845 5846Decl *Sema::ActOnUsingDeclaration(Scope *S, 5847 AccessSpecifier AS, 5848 bool HasUsingKeyword, 5849 SourceLocation UsingLoc, 5850 CXXScopeSpec &SS, 5851 UnqualifiedId &Name, 5852 AttributeList *AttrList, 5853 bool IsTypeName, 5854 SourceLocation TypenameLoc) { 5855 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5856 5857 switch (Name.getKind()) { 5858 case UnqualifiedId::IK_ImplicitSelfParam: 5859 case UnqualifiedId::IK_Identifier: 5860 case UnqualifiedId::IK_OperatorFunctionId: 5861 case UnqualifiedId::IK_LiteralOperatorId: 5862 case UnqualifiedId::IK_ConversionFunctionId: 5863 break; 5864 5865 case UnqualifiedId::IK_ConstructorName: 5866 case UnqualifiedId::IK_ConstructorTemplateId: 5867 // C++11 inheriting constructors. 5868 Diag(Name.getLocStart(), 5869 getLangOpts().CPlusPlus0x ? 5870 // FIXME: Produce warn_cxx98_compat_using_decl_constructor 5871 // instead once inheriting constructors work. 5872 diag::err_using_decl_constructor_unsupported : 5873 diag::err_using_decl_constructor) 5874 << SS.getRange(); 5875 5876 if (getLangOpts().CPlusPlus0x) break; 5877 5878 return 0; 5879 5880 case UnqualifiedId::IK_DestructorName: 5881 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 5882 << SS.getRange(); 5883 return 0; 5884 5885 case UnqualifiedId::IK_TemplateId: 5886 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 5887 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5888 return 0; 5889 } 5890 5891 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5892 DeclarationName TargetName = TargetNameInfo.getName(); 5893 if (!TargetName) 5894 return 0; 5895 5896 // Warn about using declarations. 5897 // TODO: store that the declaration was written without 'using' and 5898 // talk about access decls instead of using decls in the 5899 // diagnostics. 5900 if (!HasUsingKeyword) { 5901 UsingLoc = Name.getLocStart(); 5902 5903 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5904 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5905 } 5906 5907 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5908 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5909 return 0; 5910 5911 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5912 TargetNameInfo, AttrList, 5913 /* IsInstantiation */ false, 5914 IsTypeName, TypenameLoc); 5915 if (UD) 5916 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5917 5918 return UD; 5919} 5920 5921/// \brief Determine whether a using declaration considers the given 5922/// declarations as "equivalent", e.g., if they are redeclarations of 5923/// the same entity or are both typedefs of the same type. 5924static bool 5925IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5926 bool &SuppressRedeclaration) { 5927 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5928 SuppressRedeclaration = false; 5929 return true; 5930 } 5931 5932 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5933 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5934 SuppressRedeclaration = true; 5935 return Context.hasSameType(TD1->getUnderlyingType(), 5936 TD2->getUnderlyingType()); 5937 } 5938 5939 return false; 5940} 5941 5942 5943/// Determines whether to create a using shadow decl for a particular 5944/// decl, given the set of decls existing prior to this using lookup. 5945bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5946 const LookupResult &Previous) { 5947 // Diagnose finding a decl which is not from a base class of the 5948 // current class. We do this now because there are cases where this 5949 // function will silently decide not to build a shadow decl, which 5950 // will pre-empt further diagnostics. 5951 // 5952 // We don't need to do this in C++0x because we do the check once on 5953 // the qualifier. 5954 // 5955 // FIXME: diagnose the following if we care enough: 5956 // struct A { int foo; }; 5957 // struct B : A { using A::foo; }; 5958 // template <class T> struct C : A {}; 5959 // template <class T> struct D : C<T> { using B::foo; } // <--- 5960 // This is invalid (during instantiation) in C++03 because B::foo 5961 // resolves to the using decl in B, which is not a base class of D<T>. 5962 // We can't diagnose it immediately because C<T> is an unknown 5963 // specialization. The UsingShadowDecl in D<T> then points directly 5964 // to A::foo, which will look well-formed when we instantiate. 5965 // The right solution is to not collapse the shadow-decl chain. 5966 if (!getLangOpts().CPlusPlus0x && CurContext->isRecord()) { 5967 DeclContext *OrigDC = Orig->getDeclContext(); 5968 5969 // Handle enums and anonymous structs. 5970 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5971 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5972 while (OrigRec->isAnonymousStructOrUnion()) 5973 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5974 5975 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5976 if (OrigDC == CurContext) { 5977 Diag(Using->getLocation(), 5978 diag::err_using_decl_nested_name_specifier_is_current_class) 5979 << Using->getQualifierLoc().getSourceRange(); 5980 Diag(Orig->getLocation(), diag::note_using_decl_target); 5981 return true; 5982 } 5983 5984 Diag(Using->getQualifierLoc().getBeginLoc(), 5985 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5986 << Using->getQualifier() 5987 << cast<CXXRecordDecl>(CurContext) 5988 << Using->getQualifierLoc().getSourceRange(); 5989 Diag(Orig->getLocation(), diag::note_using_decl_target); 5990 return true; 5991 } 5992 } 5993 5994 if (Previous.empty()) return false; 5995 5996 NamedDecl *Target = Orig; 5997 if (isa<UsingShadowDecl>(Target)) 5998 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5999 6000 // If the target happens to be one of the previous declarations, we 6001 // don't have a conflict. 6002 // 6003 // FIXME: but we might be increasing its access, in which case we 6004 // should redeclare it. 6005 NamedDecl *NonTag = 0, *Tag = 0; 6006 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6007 I != E; ++I) { 6008 NamedDecl *D = (*I)->getUnderlyingDecl(); 6009 bool Result; 6010 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6011 return Result; 6012 6013 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6014 } 6015 6016 if (Target->isFunctionOrFunctionTemplate()) { 6017 FunctionDecl *FD; 6018 if (isa<FunctionTemplateDecl>(Target)) 6019 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6020 else 6021 FD = cast<FunctionDecl>(Target); 6022 6023 NamedDecl *OldDecl = 0; 6024 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6025 case Ovl_Overload: 6026 return false; 6027 6028 case Ovl_NonFunction: 6029 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6030 break; 6031 6032 // We found a decl with the exact signature. 6033 case Ovl_Match: 6034 // If we're in a record, we want to hide the target, so we 6035 // return true (without a diagnostic) to tell the caller not to 6036 // build a shadow decl. 6037 if (CurContext->isRecord()) 6038 return true; 6039 6040 // If we're not in a record, this is an error. 6041 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6042 break; 6043 } 6044 6045 Diag(Target->getLocation(), diag::note_using_decl_target); 6046 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6047 return true; 6048 } 6049 6050 // Target is not a function. 6051 6052 if (isa<TagDecl>(Target)) { 6053 // No conflict between a tag and a non-tag. 6054 if (!Tag) return false; 6055 6056 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6057 Diag(Target->getLocation(), diag::note_using_decl_target); 6058 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6059 return true; 6060 } 6061 6062 // No conflict between a tag and a non-tag. 6063 if (!NonTag) return false; 6064 6065 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6066 Diag(Target->getLocation(), diag::note_using_decl_target); 6067 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6068 return true; 6069} 6070 6071/// Builds a shadow declaration corresponding to a 'using' declaration. 6072UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6073 UsingDecl *UD, 6074 NamedDecl *Orig) { 6075 6076 // If we resolved to another shadow declaration, just coalesce them. 6077 NamedDecl *Target = Orig; 6078 if (isa<UsingShadowDecl>(Target)) { 6079 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6080 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6081 } 6082 6083 UsingShadowDecl *Shadow 6084 = UsingShadowDecl::Create(Context, CurContext, 6085 UD->getLocation(), UD, Target); 6086 UD->addShadowDecl(Shadow); 6087 6088 Shadow->setAccess(UD->getAccess()); 6089 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6090 Shadow->setInvalidDecl(); 6091 6092 if (S) 6093 PushOnScopeChains(Shadow, S); 6094 else 6095 CurContext->addDecl(Shadow); 6096 6097 6098 return Shadow; 6099} 6100 6101/// Hides a using shadow declaration. This is required by the current 6102/// using-decl implementation when a resolvable using declaration in a 6103/// class is followed by a declaration which would hide or override 6104/// one or more of the using decl's targets; for example: 6105/// 6106/// struct Base { void foo(int); }; 6107/// struct Derived : Base { 6108/// using Base::foo; 6109/// void foo(int); 6110/// }; 6111/// 6112/// The governing language is C++03 [namespace.udecl]p12: 6113/// 6114/// When a using-declaration brings names from a base class into a 6115/// derived class scope, member functions in the derived class 6116/// override and/or hide member functions with the same name and 6117/// parameter types in a base class (rather than conflicting). 6118/// 6119/// There are two ways to implement this: 6120/// (1) optimistically create shadow decls when they're not hidden 6121/// by existing declarations, or 6122/// (2) don't create any shadow decls (or at least don't make them 6123/// visible) until we've fully parsed/instantiated the class. 6124/// The problem with (1) is that we might have to retroactively remove 6125/// a shadow decl, which requires several O(n) operations because the 6126/// decl structures are (very reasonably) not designed for removal. 6127/// (2) avoids this but is very fiddly and phase-dependent. 6128void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6129 if (Shadow->getDeclName().getNameKind() == 6130 DeclarationName::CXXConversionFunctionName) 6131 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6132 6133 // Remove it from the DeclContext... 6134 Shadow->getDeclContext()->removeDecl(Shadow); 6135 6136 // ...and the scope, if applicable... 6137 if (S) { 6138 S->RemoveDecl(Shadow); 6139 IdResolver.RemoveDecl(Shadow); 6140 } 6141 6142 // ...and the using decl. 6143 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6144 6145 // TODO: complain somehow if Shadow was used. It shouldn't 6146 // be possible for this to happen, because...? 6147} 6148 6149/// Builds a using declaration. 6150/// 6151/// \param IsInstantiation - Whether this call arises from an 6152/// instantiation of an unresolved using declaration. We treat 6153/// the lookup differently for these declarations. 6154NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6155 SourceLocation UsingLoc, 6156 CXXScopeSpec &SS, 6157 const DeclarationNameInfo &NameInfo, 6158 AttributeList *AttrList, 6159 bool IsInstantiation, 6160 bool IsTypeName, 6161 SourceLocation TypenameLoc) { 6162 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6163 SourceLocation IdentLoc = NameInfo.getLoc(); 6164 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6165 6166 // FIXME: We ignore attributes for now. 6167 6168 if (SS.isEmpty()) { 6169 Diag(IdentLoc, diag::err_using_requires_qualname); 6170 return 0; 6171 } 6172 6173 // Do the redeclaration lookup in the current scope. 6174 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6175 ForRedeclaration); 6176 Previous.setHideTags(false); 6177 if (S) { 6178 LookupName(Previous, S); 6179 6180 // It is really dumb that we have to do this. 6181 LookupResult::Filter F = Previous.makeFilter(); 6182 while (F.hasNext()) { 6183 NamedDecl *D = F.next(); 6184 if (!isDeclInScope(D, CurContext, S)) 6185 F.erase(); 6186 } 6187 F.done(); 6188 } else { 6189 assert(IsInstantiation && "no scope in non-instantiation"); 6190 assert(CurContext->isRecord() && "scope not record in instantiation"); 6191 LookupQualifiedName(Previous, CurContext); 6192 } 6193 6194 // Check for invalid redeclarations. 6195 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6196 return 0; 6197 6198 // Check for bad qualifiers. 6199 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6200 return 0; 6201 6202 DeclContext *LookupContext = computeDeclContext(SS); 6203 NamedDecl *D; 6204 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6205 if (!LookupContext) { 6206 if (IsTypeName) { 6207 // FIXME: not all declaration name kinds are legal here 6208 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6209 UsingLoc, TypenameLoc, 6210 QualifierLoc, 6211 IdentLoc, NameInfo.getName()); 6212 } else { 6213 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6214 QualifierLoc, NameInfo); 6215 } 6216 } else { 6217 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6218 NameInfo, IsTypeName); 6219 } 6220 D->setAccess(AS); 6221 CurContext->addDecl(D); 6222 6223 if (!LookupContext) return D; 6224 UsingDecl *UD = cast<UsingDecl>(D); 6225 6226 if (RequireCompleteDeclContext(SS, LookupContext)) { 6227 UD->setInvalidDecl(); 6228 return UD; 6229 } 6230 6231 // The normal rules do not apply to inheriting constructor declarations. 6232 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6233 if (CheckInheritingConstructorUsingDecl(UD)) 6234 UD->setInvalidDecl(); 6235 return UD; 6236 } 6237 6238 // Otherwise, look up the target name. 6239 6240 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6241 6242 // Unlike most lookups, we don't always want to hide tag 6243 // declarations: tag names are visible through the using declaration 6244 // even if hidden by ordinary names, *except* in a dependent context 6245 // where it's important for the sanity of two-phase lookup. 6246 if (!IsInstantiation) 6247 R.setHideTags(false); 6248 6249 // For the purposes of this lookup, we have a base object type 6250 // equal to that of the current context. 6251 if (CurContext->isRecord()) { 6252 R.setBaseObjectType( 6253 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6254 } 6255 6256 LookupQualifiedName(R, LookupContext); 6257 6258 if (R.empty()) { 6259 Diag(IdentLoc, diag::err_no_member) 6260 << NameInfo.getName() << LookupContext << SS.getRange(); 6261 UD->setInvalidDecl(); 6262 return UD; 6263 } 6264 6265 if (R.isAmbiguous()) { 6266 UD->setInvalidDecl(); 6267 return UD; 6268 } 6269 6270 if (IsTypeName) { 6271 // If we asked for a typename and got a non-type decl, error out. 6272 if (!R.getAsSingle<TypeDecl>()) { 6273 Diag(IdentLoc, diag::err_using_typename_non_type); 6274 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6275 Diag((*I)->getUnderlyingDecl()->getLocation(), 6276 diag::note_using_decl_target); 6277 UD->setInvalidDecl(); 6278 return UD; 6279 } 6280 } else { 6281 // If we asked for a non-typename and we got a type, error out, 6282 // but only if this is an instantiation of an unresolved using 6283 // decl. Otherwise just silently find the type name. 6284 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6285 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6286 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6287 UD->setInvalidDecl(); 6288 return UD; 6289 } 6290 } 6291 6292 // C++0x N2914 [namespace.udecl]p6: 6293 // A using-declaration shall not name a namespace. 6294 if (R.getAsSingle<NamespaceDecl>()) { 6295 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6296 << SS.getRange(); 6297 UD->setInvalidDecl(); 6298 return UD; 6299 } 6300 6301 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6302 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6303 BuildUsingShadowDecl(S, UD, *I); 6304 } 6305 6306 return UD; 6307} 6308 6309/// Additional checks for a using declaration referring to a constructor name. 6310bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6311 assert(!UD->isTypeName() && "expecting a constructor name"); 6312 6313 const Type *SourceType = UD->getQualifier()->getAsType(); 6314 assert(SourceType && 6315 "Using decl naming constructor doesn't have type in scope spec."); 6316 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6317 6318 // Check whether the named type is a direct base class. 6319 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6320 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6321 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6322 BaseIt != BaseE; ++BaseIt) { 6323 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6324 if (CanonicalSourceType == BaseType) 6325 break; 6326 if (BaseIt->getType()->isDependentType()) 6327 break; 6328 } 6329 6330 if (BaseIt == BaseE) { 6331 // Did not find SourceType in the bases. 6332 Diag(UD->getUsingLocation(), 6333 diag::err_using_decl_constructor_not_in_direct_base) 6334 << UD->getNameInfo().getSourceRange() 6335 << QualType(SourceType, 0) << TargetClass; 6336 return true; 6337 } 6338 6339 if (!CurContext->isDependentContext()) 6340 BaseIt->setInheritConstructors(); 6341 6342 return false; 6343} 6344 6345/// Checks that the given using declaration is not an invalid 6346/// redeclaration. Note that this is checking only for the using decl 6347/// itself, not for any ill-formedness among the UsingShadowDecls. 6348bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6349 bool isTypeName, 6350 const CXXScopeSpec &SS, 6351 SourceLocation NameLoc, 6352 const LookupResult &Prev) { 6353 // C++03 [namespace.udecl]p8: 6354 // C++0x [namespace.udecl]p10: 6355 // A using-declaration is a declaration and can therefore be used 6356 // repeatedly where (and only where) multiple declarations are 6357 // allowed. 6358 // 6359 // That's in non-member contexts. 6360 if (!CurContext->getRedeclContext()->isRecord()) 6361 return false; 6362 6363 NestedNameSpecifier *Qual 6364 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6365 6366 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6367 NamedDecl *D = *I; 6368 6369 bool DTypename; 6370 NestedNameSpecifier *DQual; 6371 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6372 DTypename = UD->isTypeName(); 6373 DQual = UD->getQualifier(); 6374 } else if (UnresolvedUsingValueDecl *UD 6375 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6376 DTypename = false; 6377 DQual = UD->getQualifier(); 6378 } else if (UnresolvedUsingTypenameDecl *UD 6379 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6380 DTypename = true; 6381 DQual = UD->getQualifier(); 6382 } else continue; 6383 6384 // using decls differ if one says 'typename' and the other doesn't. 6385 // FIXME: non-dependent using decls? 6386 if (isTypeName != DTypename) continue; 6387 6388 // using decls differ if they name different scopes (but note that 6389 // template instantiation can cause this check to trigger when it 6390 // didn't before instantiation). 6391 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6392 Context.getCanonicalNestedNameSpecifier(DQual)) 6393 continue; 6394 6395 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6396 Diag(D->getLocation(), diag::note_using_decl) << 1; 6397 return true; 6398 } 6399 6400 return false; 6401} 6402 6403 6404/// Checks that the given nested-name qualifier used in a using decl 6405/// in the current context is appropriately related to the current 6406/// scope. If an error is found, diagnoses it and returns true. 6407bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6408 const CXXScopeSpec &SS, 6409 SourceLocation NameLoc) { 6410 DeclContext *NamedContext = computeDeclContext(SS); 6411 6412 if (!CurContext->isRecord()) { 6413 // C++03 [namespace.udecl]p3: 6414 // C++0x [namespace.udecl]p8: 6415 // A using-declaration for a class member shall be a member-declaration. 6416 6417 // If we weren't able to compute a valid scope, it must be a 6418 // dependent class scope. 6419 if (!NamedContext || NamedContext->isRecord()) { 6420 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6421 << SS.getRange(); 6422 return true; 6423 } 6424 6425 // Otherwise, everything is known to be fine. 6426 return false; 6427 } 6428 6429 // The current scope is a record. 6430 6431 // If the named context is dependent, we can't decide much. 6432 if (!NamedContext) { 6433 // FIXME: in C++0x, we can diagnose if we can prove that the 6434 // nested-name-specifier does not refer to a base class, which is 6435 // still possible in some cases. 6436 6437 // Otherwise we have to conservatively report that things might be 6438 // okay. 6439 return false; 6440 } 6441 6442 if (!NamedContext->isRecord()) { 6443 // Ideally this would point at the last name in the specifier, 6444 // but we don't have that level of source info. 6445 Diag(SS.getRange().getBegin(), 6446 diag::err_using_decl_nested_name_specifier_is_not_class) 6447 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6448 return true; 6449 } 6450 6451 if (!NamedContext->isDependentContext() && 6452 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6453 return true; 6454 6455 if (getLangOpts().CPlusPlus0x) { 6456 // C++0x [namespace.udecl]p3: 6457 // In a using-declaration used as a member-declaration, the 6458 // nested-name-specifier shall name a base class of the class 6459 // being defined. 6460 6461 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6462 cast<CXXRecordDecl>(NamedContext))) { 6463 if (CurContext == NamedContext) { 6464 Diag(NameLoc, 6465 diag::err_using_decl_nested_name_specifier_is_current_class) 6466 << SS.getRange(); 6467 return true; 6468 } 6469 6470 Diag(SS.getRange().getBegin(), 6471 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6472 << (NestedNameSpecifier*) SS.getScopeRep() 6473 << cast<CXXRecordDecl>(CurContext) 6474 << SS.getRange(); 6475 return true; 6476 } 6477 6478 return false; 6479 } 6480 6481 // C++03 [namespace.udecl]p4: 6482 // A using-declaration used as a member-declaration shall refer 6483 // to a member of a base class of the class being defined [etc.]. 6484 6485 // Salient point: SS doesn't have to name a base class as long as 6486 // lookup only finds members from base classes. Therefore we can 6487 // diagnose here only if we can prove that that can't happen, 6488 // i.e. if the class hierarchies provably don't intersect. 6489 6490 // TODO: it would be nice if "definitely valid" results were cached 6491 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6492 // need to be repeated. 6493 6494 struct UserData { 6495 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 6496 6497 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6498 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6499 Data->Bases.insert(Base); 6500 return true; 6501 } 6502 6503 bool hasDependentBases(const CXXRecordDecl *Class) { 6504 return !Class->forallBases(collect, this); 6505 } 6506 6507 /// Returns true if the base is dependent or is one of the 6508 /// accumulated base classes. 6509 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6510 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6511 return !Data->Bases.count(Base); 6512 } 6513 6514 bool mightShareBases(const CXXRecordDecl *Class) { 6515 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6516 } 6517 }; 6518 6519 UserData Data; 6520 6521 // Returns false if we find a dependent base. 6522 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6523 return false; 6524 6525 // Returns false if the class has a dependent base or if it or one 6526 // of its bases is present in the base set of the current context. 6527 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6528 return false; 6529 6530 Diag(SS.getRange().getBegin(), 6531 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6532 << (NestedNameSpecifier*) SS.getScopeRep() 6533 << cast<CXXRecordDecl>(CurContext) 6534 << SS.getRange(); 6535 6536 return true; 6537} 6538 6539Decl *Sema::ActOnAliasDeclaration(Scope *S, 6540 AccessSpecifier AS, 6541 MultiTemplateParamsArg TemplateParamLists, 6542 SourceLocation UsingLoc, 6543 UnqualifiedId &Name, 6544 TypeResult Type) { 6545 // Skip up to the relevant declaration scope. 6546 while (S->getFlags() & Scope::TemplateParamScope) 6547 S = S->getParent(); 6548 assert((S->getFlags() & Scope::DeclScope) && 6549 "got alias-declaration outside of declaration scope"); 6550 6551 if (Type.isInvalid()) 6552 return 0; 6553 6554 bool Invalid = false; 6555 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6556 TypeSourceInfo *TInfo = 0; 6557 GetTypeFromParser(Type.get(), &TInfo); 6558 6559 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6560 return 0; 6561 6562 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6563 UPPC_DeclarationType)) { 6564 Invalid = true; 6565 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6566 TInfo->getTypeLoc().getBeginLoc()); 6567 } 6568 6569 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6570 LookupName(Previous, S); 6571 6572 // Warn about shadowing the name of a template parameter. 6573 if (Previous.isSingleResult() && 6574 Previous.getFoundDecl()->isTemplateParameter()) { 6575 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6576 Previous.clear(); 6577 } 6578 6579 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6580 "name in alias declaration must be an identifier"); 6581 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6582 Name.StartLocation, 6583 Name.Identifier, TInfo); 6584 6585 NewTD->setAccess(AS); 6586 6587 if (Invalid) 6588 NewTD->setInvalidDecl(); 6589 6590 CheckTypedefForVariablyModifiedType(S, NewTD); 6591 Invalid |= NewTD->isInvalidDecl(); 6592 6593 bool Redeclaration = false; 6594 6595 NamedDecl *NewND; 6596 if (TemplateParamLists.size()) { 6597 TypeAliasTemplateDecl *OldDecl = 0; 6598 TemplateParameterList *OldTemplateParams = 0; 6599 6600 if (TemplateParamLists.size() != 1) { 6601 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6602 << SourceRange(TemplateParamLists[1]->getTemplateLoc(), 6603 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); 6604 } 6605 TemplateParameterList *TemplateParams = TemplateParamLists[0]; 6606 6607 // Only consider previous declarations in the same scope. 6608 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6609 /*ExplicitInstantiationOrSpecialization*/false); 6610 if (!Previous.empty()) { 6611 Redeclaration = true; 6612 6613 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6614 if (!OldDecl && !Invalid) { 6615 Diag(UsingLoc, diag::err_redefinition_different_kind) 6616 << Name.Identifier; 6617 6618 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6619 if (OldD->getLocation().isValid()) 6620 Diag(OldD->getLocation(), diag::note_previous_definition); 6621 6622 Invalid = true; 6623 } 6624 6625 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6626 if (TemplateParameterListsAreEqual(TemplateParams, 6627 OldDecl->getTemplateParameters(), 6628 /*Complain=*/true, 6629 TPL_TemplateMatch)) 6630 OldTemplateParams = OldDecl->getTemplateParameters(); 6631 else 6632 Invalid = true; 6633 6634 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6635 if (!Invalid && 6636 !Context.hasSameType(OldTD->getUnderlyingType(), 6637 NewTD->getUnderlyingType())) { 6638 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6639 // but we can't reasonably accept it. 6640 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6641 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6642 if (OldTD->getLocation().isValid()) 6643 Diag(OldTD->getLocation(), diag::note_previous_definition); 6644 Invalid = true; 6645 } 6646 } 6647 } 6648 6649 // Merge any previous default template arguments into our parameters, 6650 // and check the parameter list. 6651 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6652 TPC_TypeAliasTemplate)) 6653 return 0; 6654 6655 TypeAliasTemplateDecl *NewDecl = 6656 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6657 Name.Identifier, TemplateParams, 6658 NewTD); 6659 6660 NewDecl->setAccess(AS); 6661 6662 if (Invalid) 6663 NewDecl->setInvalidDecl(); 6664 else if (OldDecl) 6665 NewDecl->setPreviousDeclaration(OldDecl); 6666 6667 NewND = NewDecl; 6668 } else { 6669 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6670 NewND = NewTD; 6671 } 6672 6673 if (!Redeclaration) 6674 PushOnScopeChains(NewND, S); 6675 6676 ActOnDocumentableDecl(NewND); 6677 return NewND; 6678} 6679 6680Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6681 SourceLocation NamespaceLoc, 6682 SourceLocation AliasLoc, 6683 IdentifierInfo *Alias, 6684 CXXScopeSpec &SS, 6685 SourceLocation IdentLoc, 6686 IdentifierInfo *Ident) { 6687 6688 // Lookup the namespace name. 6689 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6690 LookupParsedName(R, S, &SS); 6691 6692 // Check if we have a previous declaration with the same name. 6693 NamedDecl *PrevDecl 6694 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6695 ForRedeclaration); 6696 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6697 PrevDecl = 0; 6698 6699 if (PrevDecl) { 6700 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6701 // We already have an alias with the same name that points to the same 6702 // namespace, so don't create a new one. 6703 // FIXME: At some point, we'll want to create the (redundant) 6704 // declaration to maintain better source information. 6705 if (!R.isAmbiguous() && !R.empty() && 6706 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6707 return 0; 6708 } 6709 6710 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6711 diag::err_redefinition_different_kind; 6712 Diag(AliasLoc, DiagID) << Alias; 6713 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6714 return 0; 6715 } 6716 6717 if (R.isAmbiguous()) 6718 return 0; 6719 6720 if (R.empty()) { 6721 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6722 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6723 return 0; 6724 } 6725 } 6726 6727 NamespaceAliasDecl *AliasDecl = 6728 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6729 Alias, SS.getWithLocInContext(Context), 6730 IdentLoc, R.getFoundDecl()); 6731 6732 PushOnScopeChains(AliasDecl, S); 6733 return AliasDecl; 6734} 6735 6736namespace { 6737 /// \brief Scoped object used to handle the state changes required in Sema 6738 /// to implicitly define the body of a C++ member function; 6739 class ImplicitlyDefinedFunctionScope { 6740 Sema &S; 6741 Sema::ContextRAII SavedContext; 6742 6743 public: 6744 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6745 : S(S), SavedContext(S, Method) 6746 { 6747 S.PushFunctionScope(); 6748 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6749 } 6750 6751 ~ImplicitlyDefinedFunctionScope() { 6752 S.PopExpressionEvaluationContext(); 6753 S.PopFunctionScopeInfo(); 6754 } 6755 }; 6756} 6757 6758Sema::ImplicitExceptionSpecification 6759Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 6760 CXXMethodDecl *MD) { 6761 CXXRecordDecl *ClassDecl = MD->getParent(); 6762 6763 // C++ [except.spec]p14: 6764 // An implicitly declared special member function (Clause 12) shall have an 6765 // exception-specification. [...] 6766 ImplicitExceptionSpecification ExceptSpec(*this); 6767 if (ClassDecl->isInvalidDecl()) 6768 return ExceptSpec; 6769 6770 // Direct base-class constructors. 6771 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6772 BEnd = ClassDecl->bases_end(); 6773 B != BEnd; ++B) { 6774 if (B->isVirtual()) // Handled below. 6775 continue; 6776 6777 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6778 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6779 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6780 // If this is a deleted function, add it anyway. This might be conformant 6781 // with the standard. This might not. I'm not sure. It might not matter. 6782 if (Constructor) 6783 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6784 } 6785 } 6786 6787 // Virtual base-class constructors. 6788 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6789 BEnd = ClassDecl->vbases_end(); 6790 B != BEnd; ++B) { 6791 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6792 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6793 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6794 // If this is a deleted function, add it anyway. This might be conformant 6795 // with the standard. This might not. I'm not sure. It might not matter. 6796 if (Constructor) 6797 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6798 } 6799 } 6800 6801 // Field constructors. 6802 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6803 FEnd = ClassDecl->field_end(); 6804 F != FEnd; ++F) { 6805 if (F->hasInClassInitializer()) { 6806 if (Expr *E = F->getInClassInitializer()) 6807 ExceptSpec.CalledExpr(E); 6808 else if (!F->isInvalidDecl()) 6809 // DR1351: 6810 // If the brace-or-equal-initializer of a non-static data member 6811 // invokes a defaulted default constructor of its class or of an 6812 // enclosing class in a potentially evaluated subexpression, the 6813 // program is ill-formed. 6814 // 6815 // This resolution is unworkable: the exception specification of the 6816 // default constructor can be needed in an unevaluated context, in 6817 // particular, in the operand of a noexcept-expression, and we can be 6818 // unable to compute an exception specification for an enclosed class. 6819 // 6820 // We do not allow an in-class initializer to require the evaluation 6821 // of the exception specification for any in-class initializer whose 6822 // definition is not lexically complete. 6823 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 6824 } else if (const RecordType *RecordTy 6825 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6826 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6827 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6828 // If this is a deleted function, add it anyway. This might be conformant 6829 // with the standard. This might not. I'm not sure. It might not matter. 6830 // In particular, the problem is that this function never gets called. It 6831 // might just be ill-formed because this function attempts to refer to 6832 // a deleted function here. 6833 if (Constructor) 6834 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 6835 } 6836 } 6837 6838 return ExceptSpec; 6839} 6840 6841CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6842 CXXRecordDecl *ClassDecl) { 6843 // C++ [class.ctor]p5: 6844 // A default constructor for a class X is a constructor of class X 6845 // that can be called without an argument. If there is no 6846 // user-declared constructor for class X, a default constructor is 6847 // implicitly declared. An implicitly-declared default constructor 6848 // is an inline public member of its class. 6849 assert(!ClassDecl->hasUserDeclaredConstructor() && 6850 "Should not build implicit default constructor!"); 6851 6852 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 6853 CXXDefaultConstructor, 6854 false); 6855 6856 // Create the actual constructor declaration. 6857 CanQualType ClassType 6858 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6859 SourceLocation ClassLoc = ClassDecl->getLocation(); 6860 DeclarationName Name 6861 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6862 DeclarationNameInfo NameInfo(Name, ClassLoc); 6863 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6864 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 6865 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6866 Constexpr); 6867 DefaultCon->setAccess(AS_public); 6868 DefaultCon->setDefaulted(); 6869 DefaultCon->setImplicit(); 6870 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6871 6872 // Build an exception specification pointing back at this constructor. 6873 FunctionProtoType::ExtProtoInfo EPI; 6874 EPI.ExceptionSpecType = EST_Unevaluated; 6875 EPI.ExceptionSpecDecl = DefaultCon; 6876 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6877 6878 // Note that we have declared this constructor. 6879 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6880 6881 if (Scope *S = getScopeForContext(ClassDecl)) 6882 PushOnScopeChains(DefaultCon, S, false); 6883 ClassDecl->addDecl(DefaultCon); 6884 6885 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6886 DefaultCon->setDeletedAsWritten(); 6887 6888 return DefaultCon; 6889} 6890 6891void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6892 CXXConstructorDecl *Constructor) { 6893 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6894 !Constructor->doesThisDeclarationHaveABody() && 6895 !Constructor->isDeleted()) && 6896 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6897 6898 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6899 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6900 6901 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6902 DiagnosticErrorTrap Trap(Diags); 6903 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6904 Trap.hasErrorOccurred()) { 6905 Diag(CurrentLocation, diag::note_member_synthesized_at) 6906 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6907 Constructor->setInvalidDecl(); 6908 return; 6909 } 6910 6911 SourceLocation Loc = Constructor->getLocation(); 6912 Constructor->setBody(new (Context) CompoundStmt(Loc)); 6913 6914 Constructor->setUsed(); 6915 MarkVTableUsed(CurrentLocation, ClassDecl); 6916 6917 if (ASTMutationListener *L = getASTMutationListener()) { 6918 L->CompletedImplicitDefinition(Constructor); 6919 } 6920} 6921 6922void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6923 if (!D) return; 6924 AdjustDeclIfTemplate(D); 6925 6926 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6927 6928 if (!ClassDecl->isDependentType()) 6929 CheckExplicitlyDefaultedMethods(ClassDecl); 6930} 6931 6932void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6933 // We start with an initial pass over the base classes to collect those that 6934 // inherit constructors from. If there are none, we can forgo all further 6935 // processing. 6936 typedef SmallVector<const RecordType *, 4> BasesVector; 6937 BasesVector BasesToInheritFrom; 6938 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6939 BaseE = ClassDecl->bases_end(); 6940 BaseIt != BaseE; ++BaseIt) { 6941 if (BaseIt->getInheritConstructors()) { 6942 QualType Base = BaseIt->getType(); 6943 if (Base->isDependentType()) { 6944 // If we inherit constructors from anything that is dependent, just 6945 // abort processing altogether. We'll get another chance for the 6946 // instantiations. 6947 return; 6948 } 6949 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6950 } 6951 } 6952 if (BasesToInheritFrom.empty()) 6953 return; 6954 6955 // Now collect the constructors that we already have in the current class. 6956 // Those take precedence over inherited constructors. 6957 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6958 // unless there is a user-declared constructor with the same signature in 6959 // the class where the using-declaration appears. 6960 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6961 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6962 CtorE = ClassDecl->ctor_end(); 6963 CtorIt != CtorE; ++CtorIt) { 6964 ExistingConstructors.insert( 6965 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6966 } 6967 6968 DeclarationName CreatedCtorName = 6969 Context.DeclarationNames.getCXXConstructorName( 6970 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6971 6972 // Now comes the true work. 6973 // First, we keep a map from constructor types to the base that introduced 6974 // them. Needed for finding conflicting constructors. We also keep the 6975 // actually inserted declarations in there, for pretty diagnostics. 6976 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6977 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6978 ConstructorToSourceMap InheritedConstructors; 6979 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6980 BaseE = BasesToInheritFrom.end(); 6981 BaseIt != BaseE; ++BaseIt) { 6982 const RecordType *Base = *BaseIt; 6983 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6984 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6985 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6986 CtorE = BaseDecl->ctor_end(); 6987 CtorIt != CtorE; ++CtorIt) { 6988 // Find the using declaration for inheriting this base's constructors. 6989 // FIXME: Don't perform name lookup just to obtain a source location! 6990 DeclarationName Name = 6991 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6992 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 6993 LookupQualifiedName(Result, CurContext); 6994 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 6995 SourceLocation UsingLoc = UD ? UD->getLocation() : 6996 ClassDecl->getLocation(); 6997 6998 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6999 // from the class X named in the using-declaration consists of actual 7000 // constructors and notional constructors that result from the 7001 // transformation of defaulted parameters as follows: 7002 // - all non-template default constructors of X, and 7003 // - for each non-template constructor of X that has at least one 7004 // parameter with a default argument, the set of constructors that 7005 // results from omitting any ellipsis parameter specification and 7006 // successively omitting parameters with a default argument from the 7007 // end of the parameter-type-list. 7008 CXXConstructorDecl *BaseCtor = *CtorIt; 7009 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7010 const FunctionProtoType *BaseCtorType = 7011 BaseCtor->getType()->getAs<FunctionProtoType>(); 7012 7013 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7014 maxParams = BaseCtor->getNumParams(); 7015 params <= maxParams; ++params) { 7016 // Skip default constructors. They're never inherited. 7017 if (params == 0) 7018 continue; 7019 // Skip copy and move constructors for the same reason. 7020 if (CanBeCopyOrMove && params == 1) 7021 continue; 7022 7023 // Build up a function type for this particular constructor. 7024 // FIXME: The working paper does not consider that the exception spec 7025 // for the inheriting constructor might be larger than that of the 7026 // source. This code doesn't yet, either. When it does, this code will 7027 // need to be delayed until after exception specifications and in-class 7028 // member initializers are attached. 7029 const Type *NewCtorType; 7030 if (params == maxParams) 7031 NewCtorType = BaseCtorType; 7032 else { 7033 SmallVector<QualType, 16> Args; 7034 for (unsigned i = 0; i < params; ++i) { 7035 Args.push_back(BaseCtorType->getArgType(i)); 7036 } 7037 FunctionProtoType::ExtProtoInfo ExtInfo = 7038 BaseCtorType->getExtProtoInfo(); 7039 ExtInfo.Variadic = false; 7040 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7041 Args.data(), params, ExtInfo) 7042 .getTypePtr(); 7043 } 7044 const Type *CanonicalNewCtorType = 7045 Context.getCanonicalType(NewCtorType); 7046 7047 // Now that we have the type, first check if the class already has a 7048 // constructor with this signature. 7049 if (ExistingConstructors.count(CanonicalNewCtorType)) 7050 continue; 7051 7052 // Then we check if we have already declared an inherited constructor 7053 // with this signature. 7054 std::pair<ConstructorToSourceMap::iterator, bool> result = 7055 InheritedConstructors.insert(std::make_pair( 7056 CanonicalNewCtorType, 7057 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7058 if (!result.second) { 7059 // Already in the map. If it came from a different class, that's an 7060 // error. Not if it's from the same. 7061 CanQualType PreviousBase = result.first->second.first; 7062 if (CanonicalBase != PreviousBase) { 7063 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7064 const CXXConstructorDecl *PrevBaseCtor = 7065 PrevCtor->getInheritedConstructor(); 7066 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7067 7068 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7069 Diag(BaseCtor->getLocation(), 7070 diag::note_using_decl_constructor_conflict_current_ctor); 7071 Diag(PrevBaseCtor->getLocation(), 7072 diag::note_using_decl_constructor_conflict_previous_ctor); 7073 Diag(PrevCtor->getLocation(), 7074 diag::note_using_decl_constructor_conflict_previous_using); 7075 } 7076 continue; 7077 } 7078 7079 // OK, we're there, now add the constructor. 7080 // C++0x [class.inhctor]p8: [...] that would be performed by a 7081 // user-written inline constructor [...] 7082 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7083 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7084 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7085 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7086 /*ImplicitlyDeclared=*/true, 7087 // FIXME: Due to a defect in the standard, we treat inherited 7088 // constructors as constexpr even if that makes them ill-formed. 7089 /*Constexpr=*/BaseCtor->isConstexpr()); 7090 NewCtor->setAccess(BaseCtor->getAccess()); 7091 7092 // Build up the parameter decls and add them. 7093 SmallVector<ParmVarDecl *, 16> ParamDecls; 7094 for (unsigned i = 0; i < params; ++i) { 7095 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7096 UsingLoc, UsingLoc, 7097 /*IdentifierInfo=*/0, 7098 BaseCtorType->getArgType(i), 7099 /*TInfo=*/0, SC_None, 7100 SC_None, /*DefaultArg=*/0)); 7101 } 7102 NewCtor->setParams(ParamDecls); 7103 NewCtor->setInheritedConstructor(BaseCtor); 7104 7105 ClassDecl->addDecl(NewCtor); 7106 result.first->second.second = NewCtor; 7107 } 7108 } 7109 } 7110} 7111 7112Sema::ImplicitExceptionSpecification 7113Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 7114 CXXRecordDecl *ClassDecl = MD->getParent(); 7115 7116 // C++ [except.spec]p14: 7117 // An implicitly declared special member function (Clause 12) shall have 7118 // an exception-specification. 7119 ImplicitExceptionSpecification ExceptSpec(*this); 7120 if (ClassDecl->isInvalidDecl()) 7121 return ExceptSpec; 7122 7123 // Direct base-class destructors. 7124 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7125 BEnd = ClassDecl->bases_end(); 7126 B != BEnd; ++B) { 7127 if (B->isVirtual()) // Handled below. 7128 continue; 7129 7130 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7131 ExceptSpec.CalledDecl(B->getLocStart(), 7132 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7133 } 7134 7135 // Virtual base-class destructors. 7136 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7137 BEnd = ClassDecl->vbases_end(); 7138 B != BEnd; ++B) { 7139 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7140 ExceptSpec.CalledDecl(B->getLocStart(), 7141 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7142 } 7143 7144 // Field destructors. 7145 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7146 FEnd = ClassDecl->field_end(); 7147 F != FEnd; ++F) { 7148 if (const RecordType *RecordTy 7149 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7150 ExceptSpec.CalledDecl(F->getLocation(), 7151 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7152 } 7153 7154 return ExceptSpec; 7155} 7156 7157CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7158 // C++ [class.dtor]p2: 7159 // If a class has no user-declared destructor, a destructor is 7160 // declared implicitly. An implicitly-declared destructor is an 7161 // inline public member of its class. 7162 7163 // Create the actual destructor declaration. 7164 CanQualType ClassType 7165 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7166 SourceLocation ClassLoc = ClassDecl->getLocation(); 7167 DeclarationName Name 7168 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7169 DeclarationNameInfo NameInfo(Name, ClassLoc); 7170 CXXDestructorDecl *Destructor 7171 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7172 QualType(), 0, /*isInline=*/true, 7173 /*isImplicitlyDeclared=*/true); 7174 Destructor->setAccess(AS_public); 7175 Destructor->setDefaulted(); 7176 Destructor->setImplicit(); 7177 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7178 7179 // Build an exception specification pointing back at this destructor. 7180 FunctionProtoType::ExtProtoInfo EPI; 7181 EPI.ExceptionSpecType = EST_Unevaluated; 7182 EPI.ExceptionSpecDecl = Destructor; 7183 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7184 7185 // Note that we have declared this destructor. 7186 ++ASTContext::NumImplicitDestructorsDeclared; 7187 7188 // Introduce this destructor into its scope. 7189 if (Scope *S = getScopeForContext(ClassDecl)) 7190 PushOnScopeChains(Destructor, S, false); 7191 ClassDecl->addDecl(Destructor); 7192 7193 AddOverriddenMethods(ClassDecl, Destructor); 7194 7195 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7196 Destructor->setDeletedAsWritten(); 7197 7198 return Destructor; 7199} 7200 7201void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7202 CXXDestructorDecl *Destructor) { 7203 assert((Destructor->isDefaulted() && 7204 !Destructor->doesThisDeclarationHaveABody() && 7205 !Destructor->isDeleted()) && 7206 "DefineImplicitDestructor - call it for implicit default dtor"); 7207 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7208 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7209 7210 if (Destructor->isInvalidDecl()) 7211 return; 7212 7213 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7214 7215 DiagnosticErrorTrap Trap(Diags); 7216 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7217 Destructor->getParent()); 7218 7219 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7220 Diag(CurrentLocation, diag::note_member_synthesized_at) 7221 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7222 7223 Destructor->setInvalidDecl(); 7224 return; 7225 } 7226 7227 SourceLocation Loc = Destructor->getLocation(); 7228 Destructor->setBody(new (Context) CompoundStmt(Loc)); 7229 Destructor->setImplicitlyDefined(true); 7230 Destructor->setUsed(); 7231 MarkVTableUsed(CurrentLocation, ClassDecl); 7232 7233 if (ASTMutationListener *L = getASTMutationListener()) { 7234 L->CompletedImplicitDefinition(Destructor); 7235 } 7236} 7237 7238/// \brief Perform any semantic analysis which needs to be delayed until all 7239/// pending class member declarations have been parsed. 7240void Sema::ActOnFinishCXXMemberDecls() { 7241 // Perform any deferred checking of exception specifications for virtual 7242 // destructors. 7243 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 7244 i != e; ++i) { 7245 const CXXDestructorDecl *Dtor = 7246 DelayedDestructorExceptionSpecChecks[i].first; 7247 assert(!Dtor->getParent()->isDependentType() && 7248 "Should not ever add destructors of templates into the list."); 7249 CheckOverridingFunctionExceptionSpec(Dtor, 7250 DelayedDestructorExceptionSpecChecks[i].second); 7251 } 7252 DelayedDestructorExceptionSpecChecks.clear(); 7253} 7254 7255void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 7256 CXXDestructorDecl *Destructor) { 7257 assert(getLangOpts().CPlusPlus0x && 7258 "adjusting dtor exception specs was introduced in c++11"); 7259 7260 // C++11 [class.dtor]p3: 7261 // A declaration of a destructor that does not have an exception- 7262 // specification is implicitly considered to have the same exception- 7263 // specification as an implicit declaration. 7264 const FunctionProtoType *DtorType = Destructor->getType()-> 7265 getAs<FunctionProtoType>(); 7266 if (DtorType->hasExceptionSpec()) 7267 return; 7268 7269 // Replace the destructor's type, building off the existing one. Fortunately, 7270 // the only thing of interest in the destructor type is its extended info. 7271 // The return and arguments are fixed. 7272 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 7273 EPI.ExceptionSpecType = EST_Unevaluated; 7274 EPI.ExceptionSpecDecl = Destructor; 7275 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7276 7277 // FIXME: If the destructor has a body that could throw, and the newly created 7278 // spec doesn't allow exceptions, we should emit a warning, because this 7279 // change in behavior can break conforming C++03 programs at runtime. 7280 // However, we don't have a body or an exception specification yet, so it 7281 // needs to be done somewhere else. 7282} 7283 7284/// \brief Builds a statement that copies/moves the given entity from \p From to 7285/// \c To. 7286/// 7287/// This routine is used to copy/move the members of a class with an 7288/// implicitly-declared copy/move assignment operator. When the entities being 7289/// copied are arrays, this routine builds for loops to copy them. 7290/// 7291/// \param S The Sema object used for type-checking. 7292/// 7293/// \param Loc The location where the implicit copy/move is being generated. 7294/// 7295/// \param T The type of the expressions being copied/moved. Both expressions 7296/// must have this type. 7297/// 7298/// \param To The expression we are copying/moving to. 7299/// 7300/// \param From The expression we are copying/moving from. 7301/// 7302/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7303/// Otherwise, it's a non-static member subobject. 7304/// 7305/// \param Copying Whether we're copying or moving. 7306/// 7307/// \param Depth Internal parameter recording the depth of the recursion. 7308/// 7309/// \returns A statement or a loop that copies the expressions. 7310static StmtResult 7311BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7312 Expr *To, Expr *From, 7313 bool CopyingBaseSubobject, bool Copying, 7314 unsigned Depth = 0) { 7315 // C++0x [class.copy]p28: 7316 // Each subobject is assigned in the manner appropriate to its type: 7317 // 7318 // - if the subobject is of class type, as if by a call to operator= with 7319 // the subobject as the object expression and the corresponding 7320 // subobject of x as a single function argument (as if by explicit 7321 // qualification; that is, ignoring any possible virtual overriding 7322 // functions in more derived classes); 7323 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7324 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7325 7326 // Look for operator=. 7327 DeclarationName Name 7328 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7329 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7330 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7331 7332 // Filter out any result that isn't a copy/move-assignment operator. 7333 LookupResult::Filter F = OpLookup.makeFilter(); 7334 while (F.hasNext()) { 7335 NamedDecl *D = F.next(); 7336 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7337 if (Method->isCopyAssignmentOperator() || 7338 (!Copying && Method->isMoveAssignmentOperator())) 7339 continue; 7340 7341 F.erase(); 7342 } 7343 F.done(); 7344 7345 // Suppress the protected check (C++ [class.protected]) for each of the 7346 // assignment operators we found. This strange dance is required when 7347 // we're assigning via a base classes's copy-assignment operator. To 7348 // ensure that we're getting the right base class subobject (without 7349 // ambiguities), we need to cast "this" to that subobject type; to 7350 // ensure that we don't go through the virtual call mechanism, we need 7351 // to qualify the operator= name with the base class (see below). However, 7352 // this means that if the base class has a protected copy assignment 7353 // operator, the protected member access check will fail. So, we 7354 // rewrite "protected" access to "public" access in this case, since we 7355 // know by construction that we're calling from a derived class. 7356 if (CopyingBaseSubobject) { 7357 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7358 L != LEnd; ++L) { 7359 if (L.getAccess() == AS_protected) 7360 L.setAccess(AS_public); 7361 } 7362 } 7363 7364 // Create the nested-name-specifier that will be used to qualify the 7365 // reference to operator=; this is required to suppress the virtual 7366 // call mechanism. 7367 CXXScopeSpec SS; 7368 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7369 SS.MakeTrivial(S.Context, 7370 NestedNameSpecifier::Create(S.Context, 0, false, 7371 CanonicalT), 7372 Loc); 7373 7374 // Create the reference to operator=. 7375 ExprResult OpEqualRef 7376 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7377 /*TemplateKWLoc=*/SourceLocation(), 7378 /*FirstQualifierInScope=*/0, 7379 OpLookup, 7380 /*TemplateArgs=*/0, 7381 /*SuppressQualifierCheck=*/true); 7382 if (OpEqualRef.isInvalid()) 7383 return StmtError(); 7384 7385 // Build the call to the assignment operator. 7386 7387 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7388 OpEqualRef.takeAs<Expr>(), 7389 Loc, &From, 1, Loc); 7390 if (Call.isInvalid()) 7391 return StmtError(); 7392 7393 return S.Owned(Call.takeAs<Stmt>()); 7394 } 7395 7396 // - if the subobject is of scalar type, the built-in assignment 7397 // operator is used. 7398 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7399 if (!ArrayTy) { 7400 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7401 if (Assignment.isInvalid()) 7402 return StmtError(); 7403 7404 return S.Owned(Assignment.takeAs<Stmt>()); 7405 } 7406 7407 // - if the subobject is an array, each element is assigned, in the 7408 // manner appropriate to the element type; 7409 7410 // Construct a loop over the array bounds, e.g., 7411 // 7412 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7413 // 7414 // that will copy each of the array elements. 7415 QualType SizeType = S.Context.getSizeType(); 7416 7417 // Create the iteration variable. 7418 IdentifierInfo *IterationVarName = 0; 7419 { 7420 SmallString<8> Str; 7421 llvm::raw_svector_ostream OS(Str); 7422 OS << "__i" << Depth; 7423 IterationVarName = &S.Context.Idents.get(OS.str()); 7424 } 7425 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7426 IterationVarName, SizeType, 7427 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7428 SC_None, SC_None); 7429 7430 // Initialize the iteration variable to zero. 7431 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7432 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7433 7434 // Create a reference to the iteration variable; we'll use this several 7435 // times throughout. 7436 Expr *IterationVarRef 7437 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7438 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7439 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7440 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7441 7442 // Create the DeclStmt that holds the iteration variable. 7443 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7444 7445 // Create the comparison against the array bound. 7446 llvm::APInt Upper 7447 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7448 Expr *Comparison 7449 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7450 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7451 BO_NE, S.Context.BoolTy, 7452 VK_RValue, OK_Ordinary, Loc); 7453 7454 // Create the pre-increment of the iteration variable. 7455 Expr *Increment 7456 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7457 VK_LValue, OK_Ordinary, Loc); 7458 7459 // Subscript the "from" and "to" expressions with the iteration variable. 7460 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7461 IterationVarRefRVal, 7462 Loc)); 7463 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7464 IterationVarRefRVal, 7465 Loc)); 7466 if (!Copying) // Cast to rvalue 7467 From = CastForMoving(S, From); 7468 7469 // Build the copy/move for an individual element of the array. 7470 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7471 To, From, CopyingBaseSubobject, 7472 Copying, Depth + 1); 7473 if (Copy.isInvalid()) 7474 return StmtError(); 7475 7476 // Construct the loop that copies all elements of this array. 7477 return S.ActOnForStmt(Loc, Loc, InitStmt, 7478 S.MakeFullExpr(Comparison), 7479 0, S.MakeFullExpr(Increment), 7480 Loc, Copy.take()); 7481} 7482 7483/// Determine whether an implicit copy assignment operator for ClassDecl has a 7484/// const argument. 7485/// FIXME: It ought to be possible to store this on the record. 7486static bool isImplicitCopyAssignmentArgConst(Sema &S, 7487 CXXRecordDecl *ClassDecl) { 7488 if (ClassDecl->isInvalidDecl()) 7489 return true; 7490 7491 // C++ [class.copy]p10: 7492 // If the class definition does not explicitly declare a copy 7493 // assignment operator, one is declared implicitly. 7494 // The implicitly-defined copy assignment operator for a class X 7495 // will have the form 7496 // 7497 // X& X::operator=(const X&) 7498 // 7499 // if 7500 // -- each direct base class B of X has a copy assignment operator 7501 // whose parameter is of type const B&, const volatile B& or B, 7502 // and 7503 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7504 BaseEnd = ClassDecl->bases_end(); 7505 Base != BaseEnd; ++Base) { 7506 // We'll handle this below 7507 if (S.getLangOpts().CPlusPlus0x && Base->isVirtual()) 7508 continue; 7509 7510 assert(!Base->getType()->isDependentType() && 7511 "Cannot generate implicit members for class with dependent bases."); 7512 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7513 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0)) 7514 return false; 7515 } 7516 7517 // In C++11, the above citation has "or virtual" added 7518 if (S.getLangOpts().CPlusPlus0x) { 7519 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7520 BaseEnd = ClassDecl->vbases_end(); 7521 Base != BaseEnd; ++Base) { 7522 assert(!Base->getType()->isDependentType() && 7523 "Cannot generate implicit members for class with dependent bases."); 7524 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7525 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7526 false, 0)) 7527 return false; 7528 } 7529 } 7530 7531 // -- for all the nonstatic data members of X that are of a class 7532 // type M (or array thereof), each such class type has a copy 7533 // assignment operator whose parameter is of type const M&, 7534 // const volatile M& or M. 7535 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7536 FieldEnd = ClassDecl->field_end(); 7537 Field != FieldEnd; ++Field) { 7538 QualType FieldType = S.Context.getBaseElementType(Field->getType()); 7539 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) 7540 if (!S.LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, 7541 false, 0)) 7542 return false; 7543 } 7544 7545 // Otherwise, the implicitly declared copy assignment operator will 7546 // have the form 7547 // 7548 // X& X::operator=(X&) 7549 7550 return true; 7551} 7552 7553Sema::ImplicitExceptionSpecification 7554Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 7555 CXXRecordDecl *ClassDecl = MD->getParent(); 7556 7557 ImplicitExceptionSpecification ExceptSpec(*this); 7558 if (ClassDecl->isInvalidDecl()) 7559 return ExceptSpec; 7560 7561 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 7562 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 7563 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 7564 7565 // C++ [except.spec]p14: 7566 // An implicitly declared special member function (Clause 12) shall have an 7567 // exception-specification. [...] 7568 7569 // It is unspecified whether or not an implicit copy assignment operator 7570 // attempts to deduplicate calls to assignment operators of virtual bases are 7571 // made. As such, this exception specification is effectively unspecified. 7572 // Based on a similar decision made for constness in C++0x, we're erring on 7573 // the side of assuming such calls to be made regardless of whether they 7574 // actually happen. 7575 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7576 BaseEnd = ClassDecl->bases_end(); 7577 Base != BaseEnd; ++Base) { 7578 if (Base->isVirtual()) 7579 continue; 7580 7581 CXXRecordDecl *BaseClassDecl 7582 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7583 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7584 ArgQuals, false, 0)) 7585 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7586 } 7587 7588 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7589 BaseEnd = ClassDecl->vbases_end(); 7590 Base != BaseEnd; ++Base) { 7591 CXXRecordDecl *BaseClassDecl 7592 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7593 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7594 ArgQuals, false, 0)) 7595 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7596 } 7597 7598 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7599 FieldEnd = ClassDecl->field_end(); 7600 Field != FieldEnd; 7601 ++Field) { 7602 QualType FieldType = Context.getBaseElementType(Field->getType()); 7603 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7604 if (CXXMethodDecl *CopyAssign = 7605 LookupCopyingAssignment(FieldClassDecl, 7606 ArgQuals | FieldType.getCVRQualifiers(), 7607 false, 0)) 7608 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 7609 } 7610 } 7611 7612 return ExceptSpec; 7613} 7614 7615CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7616 // Note: The following rules are largely analoguous to the copy 7617 // constructor rules. Note that virtual bases are not taken into account 7618 // for determining the argument type of the operator. Note also that 7619 // operators taking an object instead of a reference are allowed. 7620 7621 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7622 QualType RetType = Context.getLValueReferenceType(ArgType); 7623 if (isImplicitCopyAssignmentArgConst(*this, ClassDecl)) 7624 ArgType = ArgType.withConst(); 7625 ArgType = Context.getLValueReferenceType(ArgType); 7626 7627 // An implicitly-declared copy assignment operator is an inline public 7628 // member of its class. 7629 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7630 SourceLocation ClassLoc = ClassDecl->getLocation(); 7631 DeclarationNameInfo NameInfo(Name, ClassLoc); 7632 CXXMethodDecl *CopyAssignment 7633 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 7634 /*TInfo=*/0, /*isStatic=*/false, 7635 /*StorageClassAsWritten=*/SC_None, 7636 /*isInline=*/true, /*isConstexpr=*/false, 7637 SourceLocation()); 7638 CopyAssignment->setAccess(AS_public); 7639 CopyAssignment->setDefaulted(); 7640 CopyAssignment->setImplicit(); 7641 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7642 7643 // Build an exception specification pointing back at this member. 7644 FunctionProtoType::ExtProtoInfo EPI; 7645 EPI.ExceptionSpecType = EST_Unevaluated; 7646 EPI.ExceptionSpecDecl = CopyAssignment; 7647 CopyAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 7648 7649 // Add the parameter to the operator. 7650 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7651 ClassLoc, ClassLoc, /*Id=*/0, 7652 ArgType, /*TInfo=*/0, 7653 SC_None, 7654 SC_None, 0); 7655 CopyAssignment->setParams(FromParam); 7656 7657 // Note that we have added this copy-assignment operator. 7658 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7659 7660 if (Scope *S = getScopeForContext(ClassDecl)) 7661 PushOnScopeChains(CopyAssignment, S, false); 7662 ClassDecl->addDecl(CopyAssignment); 7663 7664 // C++0x [class.copy]p19: 7665 // .... If the class definition does not explicitly declare a copy 7666 // assignment operator, there is no user-declared move constructor, and 7667 // there is no user-declared move assignment operator, a copy assignment 7668 // operator is implicitly declared as defaulted. 7669 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7670 CopyAssignment->setDeletedAsWritten(); 7671 7672 AddOverriddenMethods(ClassDecl, CopyAssignment); 7673 return CopyAssignment; 7674} 7675 7676void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7677 CXXMethodDecl *CopyAssignOperator) { 7678 assert((CopyAssignOperator->isDefaulted() && 7679 CopyAssignOperator->isOverloadedOperator() && 7680 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7681 !CopyAssignOperator->doesThisDeclarationHaveABody() && 7682 !CopyAssignOperator->isDeleted()) && 7683 "DefineImplicitCopyAssignment called for wrong function"); 7684 7685 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7686 7687 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7688 CopyAssignOperator->setInvalidDecl(); 7689 return; 7690 } 7691 7692 CopyAssignOperator->setUsed(); 7693 7694 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7695 DiagnosticErrorTrap Trap(Diags); 7696 7697 // C++0x [class.copy]p30: 7698 // The implicitly-defined or explicitly-defaulted copy assignment operator 7699 // for a non-union class X performs memberwise copy assignment of its 7700 // subobjects. The direct base classes of X are assigned first, in the 7701 // order of their declaration in the base-specifier-list, and then the 7702 // immediate non-static data members of X are assigned, in the order in 7703 // which they were declared in the class definition. 7704 7705 // The statements that form the synthesized function body. 7706 SmallVector<Stmt*, 8> Statements; 7707 7708 // The parameter for the "other" object, which we are copying from. 7709 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7710 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7711 QualType OtherRefType = Other->getType(); 7712 if (const LValueReferenceType *OtherRef 7713 = OtherRefType->getAs<LValueReferenceType>()) { 7714 OtherRefType = OtherRef->getPointeeType(); 7715 OtherQuals = OtherRefType.getQualifiers(); 7716 } 7717 7718 // Our location for everything implicitly-generated. 7719 SourceLocation Loc = CopyAssignOperator->getLocation(); 7720 7721 // Construct a reference to the "other" object. We'll be using this 7722 // throughout the generated ASTs. 7723 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7724 assert(OtherRef && "Reference to parameter cannot fail!"); 7725 7726 // Construct the "this" pointer. We'll be using this throughout the generated 7727 // ASTs. 7728 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7729 assert(This && "Reference to this cannot fail!"); 7730 7731 // Assign base classes. 7732 bool Invalid = false; 7733 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7734 E = ClassDecl->bases_end(); Base != E; ++Base) { 7735 // Form the assignment: 7736 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7737 QualType BaseType = Base->getType().getUnqualifiedType(); 7738 if (!BaseType->isRecordType()) { 7739 Invalid = true; 7740 continue; 7741 } 7742 7743 CXXCastPath BasePath; 7744 BasePath.push_back(Base); 7745 7746 // Construct the "from" expression, which is an implicit cast to the 7747 // appropriately-qualified base type. 7748 Expr *From = OtherRef; 7749 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7750 CK_UncheckedDerivedToBase, 7751 VK_LValue, &BasePath).take(); 7752 7753 // Dereference "this". 7754 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7755 7756 // Implicitly cast "this" to the appropriately-qualified base type. 7757 To = ImpCastExprToType(To.take(), 7758 Context.getCVRQualifiedType(BaseType, 7759 CopyAssignOperator->getTypeQualifiers()), 7760 CK_UncheckedDerivedToBase, 7761 VK_LValue, &BasePath); 7762 7763 // Build the copy. 7764 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7765 To.get(), From, 7766 /*CopyingBaseSubobject=*/true, 7767 /*Copying=*/true); 7768 if (Copy.isInvalid()) { 7769 Diag(CurrentLocation, diag::note_member_synthesized_at) 7770 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7771 CopyAssignOperator->setInvalidDecl(); 7772 return; 7773 } 7774 7775 // Success! Record the copy. 7776 Statements.push_back(Copy.takeAs<Expr>()); 7777 } 7778 7779 // \brief Reference to the __builtin_memcpy function. 7780 Expr *BuiltinMemCpyRef = 0; 7781 // \brief Reference to the __builtin_objc_memmove_collectable function. 7782 Expr *CollectableMemCpyRef = 0; 7783 7784 // Assign non-static members. 7785 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7786 FieldEnd = ClassDecl->field_end(); 7787 Field != FieldEnd; ++Field) { 7788 if (Field->isUnnamedBitfield()) 7789 continue; 7790 7791 // Check for members of reference type; we can't copy those. 7792 if (Field->getType()->isReferenceType()) { 7793 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7794 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7795 Diag(Field->getLocation(), diag::note_declared_at); 7796 Diag(CurrentLocation, diag::note_member_synthesized_at) 7797 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7798 Invalid = true; 7799 continue; 7800 } 7801 7802 // Check for members of const-qualified, non-class type. 7803 QualType BaseType = Context.getBaseElementType(Field->getType()); 7804 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7805 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7806 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7807 Diag(Field->getLocation(), diag::note_declared_at); 7808 Diag(CurrentLocation, diag::note_member_synthesized_at) 7809 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7810 Invalid = true; 7811 continue; 7812 } 7813 7814 // Suppress assigning zero-width bitfields. 7815 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7816 continue; 7817 7818 QualType FieldType = Field->getType().getNonReferenceType(); 7819 if (FieldType->isIncompleteArrayType()) { 7820 assert(ClassDecl->hasFlexibleArrayMember() && 7821 "Incomplete array type is not valid"); 7822 continue; 7823 } 7824 7825 // Build references to the field in the object we're copying from and to. 7826 CXXScopeSpec SS; // Intentionally empty 7827 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7828 LookupMemberName); 7829 MemberLookup.addDecl(*Field); 7830 MemberLookup.resolveKind(); 7831 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7832 Loc, /*IsArrow=*/false, 7833 SS, SourceLocation(), 0, 7834 MemberLookup, 0); 7835 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7836 Loc, /*IsArrow=*/true, 7837 SS, SourceLocation(), 0, 7838 MemberLookup, 0); 7839 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7840 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7841 7842 // If the field should be copied with __builtin_memcpy rather than via 7843 // explicit assignments, do so. This optimization only applies for arrays 7844 // of scalars and arrays of class type with trivial copy-assignment 7845 // operators. 7846 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7847 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7848 // Compute the size of the memory buffer to be copied. 7849 QualType SizeType = Context.getSizeType(); 7850 llvm::APInt Size(Context.getTypeSize(SizeType), 7851 Context.getTypeSizeInChars(BaseType).getQuantity()); 7852 for (const ConstantArrayType *Array 7853 = Context.getAsConstantArrayType(FieldType); 7854 Array; 7855 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7856 llvm::APInt ArraySize 7857 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7858 Size *= ArraySize; 7859 } 7860 7861 // Take the address of the field references for "from" and "to". 7862 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7863 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7864 7865 bool NeedsCollectableMemCpy = 7866 (BaseType->isRecordType() && 7867 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7868 7869 if (NeedsCollectableMemCpy) { 7870 if (!CollectableMemCpyRef) { 7871 // Create a reference to the __builtin_objc_memmove_collectable function. 7872 LookupResult R(*this, 7873 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7874 Loc, LookupOrdinaryName); 7875 LookupName(R, TUScope, true); 7876 7877 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7878 if (!CollectableMemCpy) { 7879 // Something went horribly wrong earlier, and we will have 7880 // complained about it. 7881 Invalid = true; 7882 continue; 7883 } 7884 7885 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7886 Context.BuiltinFnTy, 7887 VK_RValue, Loc, 0).take(); 7888 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7889 } 7890 } 7891 // Create a reference to the __builtin_memcpy builtin function. 7892 else if (!BuiltinMemCpyRef) { 7893 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7894 LookupOrdinaryName); 7895 LookupName(R, TUScope, true); 7896 7897 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7898 if (!BuiltinMemCpy) { 7899 // Something went horribly wrong earlier, and we will have complained 7900 // about it. 7901 Invalid = true; 7902 continue; 7903 } 7904 7905 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7906 Context.BuiltinFnTy, 7907 VK_RValue, Loc, 0).take(); 7908 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7909 } 7910 7911 SmallVector<Expr*, 8> CallArgs; 7912 CallArgs.push_back(To.takeAs<Expr>()); 7913 CallArgs.push_back(From.takeAs<Expr>()); 7914 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7915 ExprResult Call = ExprError(); 7916 if (NeedsCollectableMemCpy) 7917 Call = ActOnCallExpr(/*Scope=*/0, 7918 CollectableMemCpyRef, 7919 Loc, CallArgs, 7920 Loc); 7921 else 7922 Call = ActOnCallExpr(/*Scope=*/0, 7923 BuiltinMemCpyRef, 7924 Loc, CallArgs, 7925 Loc); 7926 7927 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7928 Statements.push_back(Call.takeAs<Expr>()); 7929 continue; 7930 } 7931 7932 // Build the copy of this field. 7933 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7934 To.get(), From.get(), 7935 /*CopyingBaseSubobject=*/false, 7936 /*Copying=*/true); 7937 if (Copy.isInvalid()) { 7938 Diag(CurrentLocation, diag::note_member_synthesized_at) 7939 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7940 CopyAssignOperator->setInvalidDecl(); 7941 return; 7942 } 7943 7944 // Success! Record the copy. 7945 Statements.push_back(Copy.takeAs<Stmt>()); 7946 } 7947 7948 if (!Invalid) { 7949 // Add a "return *this;" 7950 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7951 7952 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7953 if (Return.isInvalid()) 7954 Invalid = true; 7955 else { 7956 Statements.push_back(Return.takeAs<Stmt>()); 7957 7958 if (Trap.hasErrorOccurred()) { 7959 Diag(CurrentLocation, diag::note_member_synthesized_at) 7960 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7961 Invalid = true; 7962 } 7963 } 7964 } 7965 7966 if (Invalid) { 7967 CopyAssignOperator->setInvalidDecl(); 7968 return; 7969 } 7970 7971 StmtResult Body; 7972 { 7973 CompoundScopeRAII CompoundScope(*this); 7974 Body = ActOnCompoundStmt(Loc, Loc, Statements, 7975 /*isStmtExpr=*/false); 7976 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7977 } 7978 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7979 7980 if (ASTMutationListener *L = getASTMutationListener()) { 7981 L->CompletedImplicitDefinition(CopyAssignOperator); 7982 } 7983} 7984 7985Sema::ImplicitExceptionSpecification 7986Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 7987 CXXRecordDecl *ClassDecl = MD->getParent(); 7988 7989 ImplicitExceptionSpecification ExceptSpec(*this); 7990 if (ClassDecl->isInvalidDecl()) 7991 return ExceptSpec; 7992 7993 // C++0x [except.spec]p14: 7994 // An implicitly declared special member function (Clause 12) shall have an 7995 // exception-specification. [...] 7996 7997 // It is unspecified whether or not an implicit move assignment operator 7998 // attempts to deduplicate calls to assignment operators of virtual bases are 7999 // made. As such, this exception specification is effectively unspecified. 8000 // Based on a similar decision made for constness in C++0x, we're erring on 8001 // the side of assuming such calls to be made regardless of whether they 8002 // actually happen. 8003 // Note that a move constructor is not implicitly declared when there are 8004 // virtual bases, but it can still be user-declared and explicitly defaulted. 8005 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8006 BaseEnd = ClassDecl->bases_end(); 8007 Base != BaseEnd; ++Base) { 8008 if (Base->isVirtual()) 8009 continue; 8010 8011 CXXRecordDecl *BaseClassDecl 8012 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8013 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8014 0, false, 0)) 8015 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8016 } 8017 8018 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8019 BaseEnd = ClassDecl->vbases_end(); 8020 Base != BaseEnd; ++Base) { 8021 CXXRecordDecl *BaseClassDecl 8022 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8023 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8024 0, false, 0)) 8025 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8026 } 8027 8028 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8029 FieldEnd = ClassDecl->field_end(); 8030 Field != FieldEnd; 8031 ++Field) { 8032 QualType FieldType = Context.getBaseElementType(Field->getType()); 8033 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8034 if (CXXMethodDecl *MoveAssign = 8035 LookupMovingAssignment(FieldClassDecl, 8036 FieldType.getCVRQualifiers(), 8037 false, 0)) 8038 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 8039 } 8040 } 8041 8042 return ExceptSpec; 8043} 8044 8045/// Determine whether the class type has any direct or indirect virtual base 8046/// classes which have a non-trivial move assignment operator. 8047static bool 8048hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 8049 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8050 BaseEnd = ClassDecl->vbases_end(); 8051 Base != BaseEnd; ++Base) { 8052 CXXRecordDecl *BaseClass = 8053 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8054 8055 // Try to declare the move assignment. If it would be deleted, then the 8056 // class does not have a non-trivial move assignment. 8057 if (BaseClass->needsImplicitMoveAssignment()) 8058 S.DeclareImplicitMoveAssignment(BaseClass); 8059 8060 // If the class has both a trivial move assignment and a non-trivial move 8061 // assignment, hasTrivialMoveAssignment() is false. 8062 if (BaseClass->hasDeclaredMoveAssignment() && 8063 !BaseClass->hasTrivialMoveAssignment()) 8064 return true; 8065 } 8066 8067 return false; 8068} 8069 8070/// Determine whether the given type either has a move constructor or is 8071/// trivially copyable. 8072static bool 8073hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8074 Type = S.Context.getBaseElementType(Type); 8075 8076 // FIXME: Technically, non-trivially-copyable non-class types, such as 8077 // reference types, are supposed to return false here, but that appears 8078 // to be a standard defect. 8079 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8080 if (!ClassDecl || !ClassDecl->getDefinition()) 8081 return true; 8082 8083 if (Type.isTriviallyCopyableType(S.Context)) 8084 return true; 8085 8086 if (IsConstructor) { 8087 if (ClassDecl->needsImplicitMoveConstructor()) 8088 S.DeclareImplicitMoveConstructor(ClassDecl); 8089 return ClassDecl->hasDeclaredMoveConstructor(); 8090 } 8091 8092 if (ClassDecl->needsImplicitMoveAssignment()) 8093 S.DeclareImplicitMoveAssignment(ClassDecl); 8094 return ClassDecl->hasDeclaredMoveAssignment(); 8095} 8096 8097/// Determine whether all non-static data members and direct or virtual bases 8098/// of class \p ClassDecl have either a move operation, or are trivially 8099/// copyable. 8100static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8101 bool IsConstructor) { 8102 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8103 BaseEnd = ClassDecl->bases_end(); 8104 Base != BaseEnd; ++Base) { 8105 if (Base->isVirtual()) 8106 continue; 8107 8108 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8109 return false; 8110 } 8111 8112 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8113 BaseEnd = ClassDecl->vbases_end(); 8114 Base != BaseEnd; ++Base) { 8115 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8116 return false; 8117 } 8118 8119 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8120 FieldEnd = ClassDecl->field_end(); 8121 Field != FieldEnd; ++Field) { 8122 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 8123 return false; 8124 } 8125 8126 return true; 8127} 8128 8129CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8130 // C++11 [class.copy]p20: 8131 // If the definition of a class X does not explicitly declare a move 8132 // assignment operator, one will be implicitly declared as defaulted 8133 // if and only if: 8134 // 8135 // - [first 4 bullets] 8136 assert(ClassDecl->needsImplicitMoveAssignment()); 8137 8138 // [Checked after we build the declaration] 8139 // - the move assignment operator would not be implicitly defined as 8140 // deleted, 8141 8142 // [DR1402]: 8143 // - X has no direct or indirect virtual base class with a non-trivial 8144 // move assignment operator, and 8145 // - each of X's non-static data members and direct or virtual base classes 8146 // has a type that either has a move assignment operator or is trivially 8147 // copyable. 8148 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8149 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8150 ClassDecl->setFailedImplicitMoveAssignment(); 8151 return 0; 8152 } 8153 8154 // Note: The following rules are largely analoguous to the move 8155 // constructor rules. 8156 8157 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8158 QualType RetType = Context.getLValueReferenceType(ArgType); 8159 ArgType = Context.getRValueReferenceType(ArgType); 8160 8161 // An implicitly-declared move assignment operator is an inline public 8162 // member of its class. 8163 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8164 SourceLocation ClassLoc = ClassDecl->getLocation(); 8165 DeclarationNameInfo NameInfo(Name, ClassLoc); 8166 CXXMethodDecl *MoveAssignment 8167 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8168 /*TInfo=*/0, /*isStatic=*/false, 8169 /*StorageClassAsWritten=*/SC_None, 8170 /*isInline=*/true, 8171 /*isConstexpr=*/false, 8172 SourceLocation()); 8173 MoveAssignment->setAccess(AS_public); 8174 MoveAssignment->setDefaulted(); 8175 MoveAssignment->setImplicit(); 8176 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8177 8178 // Build an exception specification pointing back at this member. 8179 FunctionProtoType::ExtProtoInfo EPI; 8180 EPI.ExceptionSpecType = EST_Unevaluated; 8181 EPI.ExceptionSpecDecl = MoveAssignment; 8182 MoveAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 8183 8184 // Add the parameter to the operator. 8185 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8186 ClassLoc, ClassLoc, /*Id=*/0, 8187 ArgType, /*TInfo=*/0, 8188 SC_None, 8189 SC_None, 0); 8190 MoveAssignment->setParams(FromParam); 8191 8192 // Note that we have added this copy-assignment operator. 8193 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8194 8195 // C++0x [class.copy]p9: 8196 // If the definition of a class X does not explicitly declare a move 8197 // assignment operator, one will be implicitly declared as defaulted if and 8198 // only if: 8199 // [...] 8200 // - the move assignment operator would not be implicitly defined as 8201 // deleted. 8202 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8203 // Cache this result so that we don't try to generate this over and over 8204 // on every lookup, leaking memory and wasting time. 8205 ClassDecl->setFailedImplicitMoveAssignment(); 8206 return 0; 8207 } 8208 8209 if (Scope *S = getScopeForContext(ClassDecl)) 8210 PushOnScopeChains(MoveAssignment, S, false); 8211 ClassDecl->addDecl(MoveAssignment); 8212 8213 AddOverriddenMethods(ClassDecl, MoveAssignment); 8214 return MoveAssignment; 8215} 8216 8217void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8218 CXXMethodDecl *MoveAssignOperator) { 8219 assert((MoveAssignOperator->isDefaulted() && 8220 MoveAssignOperator->isOverloadedOperator() && 8221 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8222 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8223 !MoveAssignOperator->isDeleted()) && 8224 "DefineImplicitMoveAssignment called for wrong function"); 8225 8226 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8227 8228 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8229 MoveAssignOperator->setInvalidDecl(); 8230 return; 8231 } 8232 8233 MoveAssignOperator->setUsed(); 8234 8235 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8236 DiagnosticErrorTrap Trap(Diags); 8237 8238 // C++0x [class.copy]p28: 8239 // The implicitly-defined or move assignment operator for a non-union class 8240 // X performs memberwise move assignment of its subobjects. The direct base 8241 // classes of X are assigned first, in the order of their declaration in the 8242 // base-specifier-list, and then the immediate non-static data members of X 8243 // are assigned, in the order in which they were declared in the class 8244 // definition. 8245 8246 // The statements that form the synthesized function body. 8247 SmallVector<Stmt*, 8> Statements; 8248 8249 // The parameter for the "other" object, which we are move from. 8250 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8251 QualType OtherRefType = Other->getType()-> 8252 getAs<RValueReferenceType>()->getPointeeType(); 8253 assert(OtherRefType.getQualifiers() == 0 && 8254 "Bad argument type of defaulted move assignment"); 8255 8256 // Our location for everything implicitly-generated. 8257 SourceLocation Loc = MoveAssignOperator->getLocation(); 8258 8259 // Construct a reference to the "other" object. We'll be using this 8260 // throughout the generated ASTs. 8261 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8262 assert(OtherRef && "Reference to parameter cannot fail!"); 8263 // Cast to rvalue. 8264 OtherRef = CastForMoving(*this, OtherRef); 8265 8266 // Construct the "this" pointer. We'll be using this throughout the generated 8267 // ASTs. 8268 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8269 assert(This && "Reference to this cannot fail!"); 8270 8271 // Assign base classes. 8272 bool Invalid = false; 8273 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8274 E = ClassDecl->bases_end(); Base != E; ++Base) { 8275 // Form the assignment: 8276 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8277 QualType BaseType = Base->getType().getUnqualifiedType(); 8278 if (!BaseType->isRecordType()) { 8279 Invalid = true; 8280 continue; 8281 } 8282 8283 CXXCastPath BasePath; 8284 BasePath.push_back(Base); 8285 8286 // Construct the "from" expression, which is an implicit cast to the 8287 // appropriately-qualified base type. 8288 Expr *From = OtherRef; 8289 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8290 VK_XValue, &BasePath).take(); 8291 8292 // Dereference "this". 8293 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8294 8295 // Implicitly cast "this" to the appropriately-qualified base type. 8296 To = ImpCastExprToType(To.take(), 8297 Context.getCVRQualifiedType(BaseType, 8298 MoveAssignOperator->getTypeQualifiers()), 8299 CK_UncheckedDerivedToBase, 8300 VK_LValue, &BasePath); 8301 8302 // Build the move. 8303 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8304 To.get(), From, 8305 /*CopyingBaseSubobject=*/true, 8306 /*Copying=*/false); 8307 if (Move.isInvalid()) { 8308 Diag(CurrentLocation, diag::note_member_synthesized_at) 8309 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8310 MoveAssignOperator->setInvalidDecl(); 8311 return; 8312 } 8313 8314 // Success! Record the move. 8315 Statements.push_back(Move.takeAs<Expr>()); 8316 } 8317 8318 // \brief Reference to the __builtin_memcpy function. 8319 Expr *BuiltinMemCpyRef = 0; 8320 // \brief Reference to the __builtin_objc_memmove_collectable function. 8321 Expr *CollectableMemCpyRef = 0; 8322 8323 // Assign non-static members. 8324 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8325 FieldEnd = ClassDecl->field_end(); 8326 Field != FieldEnd; ++Field) { 8327 if (Field->isUnnamedBitfield()) 8328 continue; 8329 8330 // Check for members of reference type; we can't move those. 8331 if (Field->getType()->isReferenceType()) { 8332 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8333 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8334 Diag(Field->getLocation(), diag::note_declared_at); 8335 Diag(CurrentLocation, diag::note_member_synthesized_at) 8336 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8337 Invalid = true; 8338 continue; 8339 } 8340 8341 // Check for members of const-qualified, non-class type. 8342 QualType BaseType = Context.getBaseElementType(Field->getType()); 8343 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8344 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8345 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8346 Diag(Field->getLocation(), diag::note_declared_at); 8347 Diag(CurrentLocation, diag::note_member_synthesized_at) 8348 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8349 Invalid = true; 8350 continue; 8351 } 8352 8353 // Suppress assigning zero-width bitfields. 8354 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8355 continue; 8356 8357 QualType FieldType = Field->getType().getNonReferenceType(); 8358 if (FieldType->isIncompleteArrayType()) { 8359 assert(ClassDecl->hasFlexibleArrayMember() && 8360 "Incomplete array type is not valid"); 8361 continue; 8362 } 8363 8364 // Build references to the field in the object we're copying from and to. 8365 CXXScopeSpec SS; // Intentionally empty 8366 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8367 LookupMemberName); 8368 MemberLookup.addDecl(*Field); 8369 MemberLookup.resolveKind(); 8370 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8371 Loc, /*IsArrow=*/false, 8372 SS, SourceLocation(), 0, 8373 MemberLookup, 0); 8374 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8375 Loc, /*IsArrow=*/true, 8376 SS, SourceLocation(), 0, 8377 MemberLookup, 0); 8378 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8379 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8380 8381 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8382 "Member reference with rvalue base must be rvalue except for reference " 8383 "members, which aren't allowed for move assignment."); 8384 8385 // If the field should be copied with __builtin_memcpy rather than via 8386 // explicit assignments, do so. This optimization only applies for arrays 8387 // of scalars and arrays of class type with trivial move-assignment 8388 // operators. 8389 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8390 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8391 // Compute the size of the memory buffer to be copied. 8392 QualType SizeType = Context.getSizeType(); 8393 llvm::APInt Size(Context.getTypeSize(SizeType), 8394 Context.getTypeSizeInChars(BaseType).getQuantity()); 8395 for (const ConstantArrayType *Array 8396 = Context.getAsConstantArrayType(FieldType); 8397 Array; 8398 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8399 llvm::APInt ArraySize 8400 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8401 Size *= ArraySize; 8402 } 8403 8404 // Take the address of the field references for "from" and "to". We 8405 // directly construct UnaryOperators here because semantic analysis 8406 // does not permit us to take the address of an xvalue. 8407 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8408 Context.getPointerType(From.get()->getType()), 8409 VK_RValue, OK_Ordinary, Loc); 8410 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8411 Context.getPointerType(To.get()->getType()), 8412 VK_RValue, OK_Ordinary, Loc); 8413 8414 bool NeedsCollectableMemCpy = 8415 (BaseType->isRecordType() && 8416 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8417 8418 if (NeedsCollectableMemCpy) { 8419 if (!CollectableMemCpyRef) { 8420 // Create a reference to the __builtin_objc_memmove_collectable function. 8421 LookupResult R(*this, 8422 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8423 Loc, LookupOrdinaryName); 8424 LookupName(R, TUScope, true); 8425 8426 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8427 if (!CollectableMemCpy) { 8428 // Something went horribly wrong earlier, and we will have 8429 // complained about it. 8430 Invalid = true; 8431 continue; 8432 } 8433 8434 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8435 Context.BuiltinFnTy, 8436 VK_RValue, Loc, 0).take(); 8437 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8438 } 8439 } 8440 // Create a reference to the __builtin_memcpy builtin function. 8441 else if (!BuiltinMemCpyRef) { 8442 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8443 LookupOrdinaryName); 8444 LookupName(R, TUScope, true); 8445 8446 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8447 if (!BuiltinMemCpy) { 8448 // Something went horribly wrong earlier, and we will have complained 8449 // about it. 8450 Invalid = true; 8451 continue; 8452 } 8453 8454 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8455 Context.BuiltinFnTy, 8456 VK_RValue, Loc, 0).take(); 8457 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8458 } 8459 8460 SmallVector<Expr*, 8> CallArgs; 8461 CallArgs.push_back(To.takeAs<Expr>()); 8462 CallArgs.push_back(From.takeAs<Expr>()); 8463 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8464 ExprResult Call = ExprError(); 8465 if (NeedsCollectableMemCpy) 8466 Call = ActOnCallExpr(/*Scope=*/0, 8467 CollectableMemCpyRef, 8468 Loc, CallArgs, 8469 Loc); 8470 else 8471 Call = ActOnCallExpr(/*Scope=*/0, 8472 BuiltinMemCpyRef, 8473 Loc, CallArgs, 8474 Loc); 8475 8476 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8477 Statements.push_back(Call.takeAs<Expr>()); 8478 continue; 8479 } 8480 8481 // Build the move of this field. 8482 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8483 To.get(), From.get(), 8484 /*CopyingBaseSubobject=*/false, 8485 /*Copying=*/false); 8486 if (Move.isInvalid()) { 8487 Diag(CurrentLocation, diag::note_member_synthesized_at) 8488 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8489 MoveAssignOperator->setInvalidDecl(); 8490 return; 8491 } 8492 8493 // Success! Record the copy. 8494 Statements.push_back(Move.takeAs<Stmt>()); 8495 } 8496 8497 if (!Invalid) { 8498 // Add a "return *this;" 8499 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8500 8501 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8502 if (Return.isInvalid()) 8503 Invalid = true; 8504 else { 8505 Statements.push_back(Return.takeAs<Stmt>()); 8506 8507 if (Trap.hasErrorOccurred()) { 8508 Diag(CurrentLocation, diag::note_member_synthesized_at) 8509 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8510 Invalid = true; 8511 } 8512 } 8513 } 8514 8515 if (Invalid) { 8516 MoveAssignOperator->setInvalidDecl(); 8517 return; 8518 } 8519 8520 StmtResult Body; 8521 { 8522 CompoundScopeRAII CompoundScope(*this); 8523 Body = ActOnCompoundStmt(Loc, Loc, Statements, 8524 /*isStmtExpr=*/false); 8525 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8526 } 8527 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8528 8529 if (ASTMutationListener *L = getASTMutationListener()) { 8530 L->CompletedImplicitDefinition(MoveAssignOperator); 8531 } 8532} 8533 8534/// Determine whether an implicit copy constructor for ClassDecl has a const 8535/// argument. 8536/// FIXME: It ought to be possible to store this on the record. 8537static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl) { 8538 if (ClassDecl->isInvalidDecl()) 8539 return true; 8540 8541 // C++ [class.copy]p5: 8542 // The implicitly-declared copy constructor for a class X will 8543 // have the form 8544 // 8545 // X::X(const X&) 8546 // 8547 // if 8548 // -- each direct or virtual base class B of X has a copy 8549 // constructor whose first parameter is of type const B& or 8550 // const volatile B&, and 8551 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8552 BaseEnd = ClassDecl->bases_end(); 8553 Base != BaseEnd; ++Base) { 8554 // Virtual bases are handled below. 8555 if (Base->isVirtual()) 8556 continue; 8557 8558 CXXRecordDecl *BaseClassDecl 8559 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8560 // FIXME: This lookup is wrong. If the copy ctor for a member or base is 8561 // ambiguous, we should still produce a constructor with a const-qualified 8562 // parameter. 8563 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const)) 8564 return false; 8565 } 8566 8567 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8568 BaseEnd = ClassDecl->vbases_end(); 8569 Base != BaseEnd; ++Base) { 8570 CXXRecordDecl *BaseClassDecl 8571 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8572 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const)) 8573 return false; 8574 } 8575 8576 // -- for all the nonstatic data members of X that are of a 8577 // class type M (or array thereof), each such class type 8578 // has a copy constructor whose first parameter is of type 8579 // const M& or const volatile M&. 8580 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8581 FieldEnd = ClassDecl->field_end(); 8582 Field != FieldEnd; ++Field) { 8583 QualType FieldType = S.Context.getBaseElementType(Field->getType()); 8584 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8585 if (!S.LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const)) 8586 return false; 8587 } 8588 } 8589 8590 // Otherwise, the implicitly declared copy constructor will have 8591 // the form 8592 // 8593 // X::X(X&) 8594 8595 return true; 8596} 8597 8598Sema::ImplicitExceptionSpecification 8599Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 8600 CXXRecordDecl *ClassDecl = MD->getParent(); 8601 8602 ImplicitExceptionSpecification ExceptSpec(*this); 8603 if (ClassDecl->isInvalidDecl()) 8604 return ExceptSpec; 8605 8606 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 8607 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 8608 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 8609 8610 // C++ [except.spec]p14: 8611 // An implicitly declared special member function (Clause 12) shall have an 8612 // exception-specification. [...] 8613 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8614 BaseEnd = ClassDecl->bases_end(); 8615 Base != BaseEnd; 8616 ++Base) { 8617 // Virtual bases are handled below. 8618 if (Base->isVirtual()) 8619 continue; 8620 8621 CXXRecordDecl *BaseClassDecl 8622 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8623 if (CXXConstructorDecl *CopyConstructor = 8624 LookupCopyingConstructor(BaseClassDecl, Quals)) 8625 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8626 } 8627 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8628 BaseEnd = ClassDecl->vbases_end(); 8629 Base != BaseEnd; 8630 ++Base) { 8631 CXXRecordDecl *BaseClassDecl 8632 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8633 if (CXXConstructorDecl *CopyConstructor = 8634 LookupCopyingConstructor(BaseClassDecl, Quals)) 8635 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8636 } 8637 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8638 FieldEnd = ClassDecl->field_end(); 8639 Field != FieldEnd; 8640 ++Field) { 8641 QualType FieldType = Context.getBaseElementType(Field->getType()); 8642 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8643 if (CXXConstructorDecl *CopyConstructor = 8644 LookupCopyingConstructor(FieldClassDecl, 8645 Quals | FieldType.getCVRQualifiers())) 8646 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 8647 } 8648 } 8649 8650 return ExceptSpec; 8651} 8652 8653CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8654 CXXRecordDecl *ClassDecl) { 8655 // C++ [class.copy]p4: 8656 // If the class definition does not explicitly declare a copy 8657 // constructor, one is declared implicitly. 8658 8659 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8660 QualType ArgType = ClassType; 8661 bool Const = isImplicitCopyCtorArgConst(*this, ClassDecl); 8662 if (Const) 8663 ArgType = ArgType.withConst(); 8664 ArgType = Context.getLValueReferenceType(ArgType); 8665 8666 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8667 CXXCopyConstructor, 8668 Const); 8669 8670 DeclarationName Name 8671 = Context.DeclarationNames.getCXXConstructorName( 8672 Context.getCanonicalType(ClassType)); 8673 SourceLocation ClassLoc = ClassDecl->getLocation(); 8674 DeclarationNameInfo NameInfo(Name, ClassLoc); 8675 8676 // An implicitly-declared copy constructor is an inline public 8677 // member of its class. 8678 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8679 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 8680 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8681 Constexpr); 8682 CopyConstructor->setAccess(AS_public); 8683 CopyConstructor->setDefaulted(); 8684 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8685 8686 // Build an exception specification pointing back at this member. 8687 FunctionProtoType::ExtProtoInfo EPI; 8688 EPI.ExceptionSpecType = EST_Unevaluated; 8689 EPI.ExceptionSpecDecl = CopyConstructor; 8690 CopyConstructor->setType( 8691 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 8692 8693 // Note that we have declared this constructor. 8694 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8695 8696 // Add the parameter to the constructor. 8697 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8698 ClassLoc, ClassLoc, 8699 /*IdentifierInfo=*/0, 8700 ArgType, /*TInfo=*/0, 8701 SC_None, 8702 SC_None, 0); 8703 CopyConstructor->setParams(FromParam); 8704 8705 if (Scope *S = getScopeForContext(ClassDecl)) 8706 PushOnScopeChains(CopyConstructor, S, false); 8707 ClassDecl->addDecl(CopyConstructor); 8708 8709 // C++11 [class.copy]p8: 8710 // ... If the class definition does not explicitly declare a copy 8711 // constructor, there is no user-declared move constructor, and there is no 8712 // user-declared move assignment operator, a copy constructor is implicitly 8713 // declared as defaulted. 8714 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8715 CopyConstructor->setDeletedAsWritten(); 8716 8717 return CopyConstructor; 8718} 8719 8720void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8721 CXXConstructorDecl *CopyConstructor) { 8722 assert((CopyConstructor->isDefaulted() && 8723 CopyConstructor->isCopyConstructor() && 8724 !CopyConstructor->doesThisDeclarationHaveABody() && 8725 !CopyConstructor->isDeleted()) && 8726 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8727 8728 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8729 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8730 8731 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8732 DiagnosticErrorTrap Trap(Diags); 8733 8734 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8735 Trap.hasErrorOccurred()) { 8736 Diag(CurrentLocation, diag::note_member_synthesized_at) 8737 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8738 CopyConstructor->setInvalidDecl(); 8739 } else { 8740 Sema::CompoundScopeRAII CompoundScope(*this); 8741 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8742 CopyConstructor->getLocation(), 8743 MultiStmtArg(), 8744 /*isStmtExpr=*/false) 8745 .takeAs<Stmt>()); 8746 CopyConstructor->setImplicitlyDefined(true); 8747 } 8748 8749 CopyConstructor->setUsed(); 8750 if (ASTMutationListener *L = getASTMutationListener()) { 8751 L->CompletedImplicitDefinition(CopyConstructor); 8752 } 8753} 8754 8755Sema::ImplicitExceptionSpecification 8756Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 8757 CXXRecordDecl *ClassDecl = MD->getParent(); 8758 8759 // C++ [except.spec]p14: 8760 // An implicitly declared special member function (Clause 12) shall have an 8761 // exception-specification. [...] 8762 ImplicitExceptionSpecification ExceptSpec(*this); 8763 if (ClassDecl->isInvalidDecl()) 8764 return ExceptSpec; 8765 8766 // Direct base-class constructors. 8767 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8768 BEnd = ClassDecl->bases_end(); 8769 B != BEnd; ++B) { 8770 if (B->isVirtual()) // Handled below. 8771 continue; 8772 8773 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8774 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8775 CXXConstructorDecl *Constructor = 8776 LookupMovingConstructor(BaseClassDecl, 0); 8777 // If this is a deleted function, add it anyway. This might be conformant 8778 // with the standard. This might not. I'm not sure. It might not matter. 8779 if (Constructor) 8780 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8781 } 8782 } 8783 8784 // Virtual base-class constructors. 8785 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8786 BEnd = ClassDecl->vbases_end(); 8787 B != BEnd; ++B) { 8788 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8789 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8790 CXXConstructorDecl *Constructor = 8791 LookupMovingConstructor(BaseClassDecl, 0); 8792 // If this is a deleted function, add it anyway. This might be conformant 8793 // with the standard. This might not. I'm not sure. It might not matter. 8794 if (Constructor) 8795 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8796 } 8797 } 8798 8799 // Field constructors. 8800 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8801 FEnd = ClassDecl->field_end(); 8802 F != FEnd; ++F) { 8803 QualType FieldType = Context.getBaseElementType(F->getType()); 8804 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 8805 CXXConstructorDecl *Constructor = 8806 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 8807 // If this is a deleted function, add it anyway. This might be conformant 8808 // with the standard. This might not. I'm not sure. It might not matter. 8809 // In particular, the problem is that this function never gets called. It 8810 // might just be ill-formed because this function attempts to refer to 8811 // a deleted function here. 8812 if (Constructor) 8813 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 8814 } 8815 } 8816 8817 return ExceptSpec; 8818} 8819 8820CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8821 CXXRecordDecl *ClassDecl) { 8822 // C++11 [class.copy]p9: 8823 // If the definition of a class X does not explicitly declare a move 8824 // constructor, one will be implicitly declared as defaulted if and only if: 8825 // 8826 // - [first 4 bullets] 8827 assert(ClassDecl->needsImplicitMoveConstructor()); 8828 8829 // [Checked after we build the declaration] 8830 // - the move assignment operator would not be implicitly defined as 8831 // deleted, 8832 8833 // [DR1402]: 8834 // - each of X's non-static data members and direct or virtual base classes 8835 // has a type that either has a move constructor or is trivially copyable. 8836 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 8837 ClassDecl->setFailedImplicitMoveConstructor(); 8838 return 0; 8839 } 8840 8841 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8842 QualType ArgType = Context.getRValueReferenceType(ClassType); 8843 8844 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8845 CXXMoveConstructor, 8846 false); 8847 8848 DeclarationName Name 8849 = Context.DeclarationNames.getCXXConstructorName( 8850 Context.getCanonicalType(ClassType)); 8851 SourceLocation ClassLoc = ClassDecl->getLocation(); 8852 DeclarationNameInfo NameInfo(Name, ClassLoc); 8853 8854 // C++0x [class.copy]p11: 8855 // An implicitly-declared copy/move constructor is an inline public 8856 // member of its class. 8857 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8858 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 8859 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8860 Constexpr); 8861 MoveConstructor->setAccess(AS_public); 8862 MoveConstructor->setDefaulted(); 8863 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8864 8865 // Build an exception specification pointing back at this member. 8866 FunctionProtoType::ExtProtoInfo EPI; 8867 EPI.ExceptionSpecType = EST_Unevaluated; 8868 EPI.ExceptionSpecDecl = MoveConstructor; 8869 MoveConstructor->setType( 8870 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 8871 8872 // Add the parameter to the constructor. 8873 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8874 ClassLoc, ClassLoc, 8875 /*IdentifierInfo=*/0, 8876 ArgType, /*TInfo=*/0, 8877 SC_None, 8878 SC_None, 0); 8879 MoveConstructor->setParams(FromParam); 8880 8881 // C++0x [class.copy]p9: 8882 // If the definition of a class X does not explicitly declare a move 8883 // constructor, one will be implicitly declared as defaulted if and only if: 8884 // [...] 8885 // - the move constructor would not be implicitly defined as deleted. 8886 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8887 // Cache this result so that we don't try to generate this over and over 8888 // on every lookup, leaking memory and wasting time. 8889 ClassDecl->setFailedImplicitMoveConstructor(); 8890 return 0; 8891 } 8892 8893 // Note that we have declared this constructor. 8894 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8895 8896 if (Scope *S = getScopeForContext(ClassDecl)) 8897 PushOnScopeChains(MoveConstructor, S, false); 8898 ClassDecl->addDecl(MoveConstructor); 8899 8900 return MoveConstructor; 8901} 8902 8903void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8904 CXXConstructorDecl *MoveConstructor) { 8905 assert((MoveConstructor->isDefaulted() && 8906 MoveConstructor->isMoveConstructor() && 8907 !MoveConstructor->doesThisDeclarationHaveABody() && 8908 !MoveConstructor->isDeleted()) && 8909 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8910 8911 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8912 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8913 8914 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8915 DiagnosticErrorTrap Trap(Diags); 8916 8917 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8918 Trap.hasErrorOccurred()) { 8919 Diag(CurrentLocation, diag::note_member_synthesized_at) 8920 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8921 MoveConstructor->setInvalidDecl(); 8922 } else { 8923 Sema::CompoundScopeRAII CompoundScope(*this); 8924 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8925 MoveConstructor->getLocation(), 8926 MultiStmtArg(), 8927 /*isStmtExpr=*/false) 8928 .takeAs<Stmt>()); 8929 MoveConstructor->setImplicitlyDefined(true); 8930 } 8931 8932 MoveConstructor->setUsed(); 8933 8934 if (ASTMutationListener *L = getASTMutationListener()) { 8935 L->CompletedImplicitDefinition(MoveConstructor); 8936 } 8937} 8938 8939bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 8940 return FD->isDeleted() && 8941 (FD->isDefaulted() || FD->isImplicit()) && 8942 isa<CXXMethodDecl>(FD); 8943} 8944 8945/// \brief Mark the call operator of the given lambda closure type as "used". 8946static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 8947 CXXMethodDecl *CallOperator 8948 = cast<CXXMethodDecl>( 8949 *Lambda->lookup( 8950 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8951 CallOperator->setReferenced(); 8952 CallOperator->setUsed(); 8953} 8954 8955void Sema::DefineImplicitLambdaToFunctionPointerConversion( 8956 SourceLocation CurrentLocation, 8957 CXXConversionDecl *Conv) 8958{ 8959 CXXRecordDecl *Lambda = Conv->getParent(); 8960 8961 // Make sure that the lambda call operator is marked used. 8962 markLambdaCallOperatorUsed(*this, Lambda); 8963 8964 Conv->setUsed(); 8965 8966 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8967 DiagnosticErrorTrap Trap(Diags); 8968 8969 // Return the address of the __invoke function. 8970 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 8971 CXXMethodDecl *Invoke 8972 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 8973 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 8974 VK_LValue, Conv->getLocation()).take(); 8975 assert(FunctionRef && "Can't refer to __invoke function?"); 8976 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 8977 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 8978 Conv->getLocation(), 8979 Conv->getLocation())); 8980 8981 // Fill in the __invoke function with a dummy implementation. IR generation 8982 // will fill in the actual details. 8983 Invoke->setUsed(); 8984 Invoke->setReferenced(); 8985 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation())); 8986 8987 if (ASTMutationListener *L = getASTMutationListener()) { 8988 L->CompletedImplicitDefinition(Conv); 8989 L->CompletedImplicitDefinition(Invoke); 8990 } 8991} 8992 8993void Sema::DefineImplicitLambdaToBlockPointerConversion( 8994 SourceLocation CurrentLocation, 8995 CXXConversionDecl *Conv) 8996{ 8997 Conv->setUsed(); 8998 8999 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 9000 DiagnosticErrorTrap Trap(Diags); 9001 9002 // Copy-initialize the lambda object as needed to capture it. 9003 Expr *This = ActOnCXXThis(CurrentLocation).take(); 9004 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 9005 9006 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 9007 Conv->getLocation(), 9008 Conv, DerefThis); 9009 9010 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 9011 // behavior. Note that only the general conversion function does this 9012 // (since it's unusable otherwise); in the case where we inline the 9013 // block literal, it has block literal lifetime semantics. 9014 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 9015 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 9016 CK_CopyAndAutoreleaseBlockObject, 9017 BuildBlock.get(), 0, VK_RValue); 9018 9019 if (BuildBlock.isInvalid()) { 9020 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9021 Conv->setInvalidDecl(); 9022 return; 9023 } 9024 9025 // Create the return statement that returns the block from the conversion 9026 // function. 9027 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 9028 if (Return.isInvalid()) { 9029 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9030 Conv->setInvalidDecl(); 9031 return; 9032 } 9033 9034 // Set the body of the conversion function. 9035 Stmt *ReturnS = Return.take(); 9036 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 9037 Conv->getLocation(), 9038 Conv->getLocation())); 9039 9040 // We're done; notify the mutation listener, if any. 9041 if (ASTMutationListener *L = getASTMutationListener()) { 9042 L->CompletedImplicitDefinition(Conv); 9043 } 9044} 9045 9046/// \brief Determine whether the given list arguments contains exactly one 9047/// "real" (non-default) argument. 9048static bool hasOneRealArgument(MultiExprArg Args) { 9049 switch (Args.size()) { 9050 case 0: 9051 return false; 9052 9053 default: 9054 if (!Args[1]->isDefaultArgument()) 9055 return false; 9056 9057 // fall through 9058 case 1: 9059 return !Args[0]->isDefaultArgument(); 9060 } 9061 9062 return false; 9063} 9064 9065ExprResult 9066Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9067 CXXConstructorDecl *Constructor, 9068 MultiExprArg ExprArgs, 9069 bool HadMultipleCandidates, 9070 bool RequiresZeroInit, 9071 unsigned ConstructKind, 9072 SourceRange ParenRange) { 9073 bool Elidable = false; 9074 9075 // C++0x [class.copy]p34: 9076 // When certain criteria are met, an implementation is allowed to 9077 // omit the copy/move construction of a class object, even if the 9078 // copy/move constructor and/or destructor for the object have 9079 // side effects. [...] 9080 // - when a temporary class object that has not been bound to a 9081 // reference (12.2) would be copied/moved to a class object 9082 // with the same cv-unqualified type, the copy/move operation 9083 // can be omitted by constructing the temporary object 9084 // directly into the target of the omitted copy/move 9085 if (ConstructKind == CXXConstructExpr::CK_Complete && 9086 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9087 Expr *SubExpr = ExprArgs[0]; 9088 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9089 } 9090 9091 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9092 Elidable, ExprArgs, HadMultipleCandidates, 9093 RequiresZeroInit, ConstructKind, ParenRange); 9094} 9095 9096/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9097/// including handling of its default argument expressions. 9098ExprResult 9099Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9100 CXXConstructorDecl *Constructor, bool Elidable, 9101 MultiExprArg ExprArgs, 9102 bool HadMultipleCandidates, 9103 bool RequiresZeroInit, 9104 unsigned ConstructKind, 9105 SourceRange ParenRange) { 9106 MarkFunctionReferenced(ConstructLoc, Constructor); 9107 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9108 Constructor, Elidable, ExprArgs, 9109 HadMultipleCandidates, /*FIXME*/false, 9110 RequiresZeroInit, 9111 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9112 ParenRange)); 9113} 9114 9115bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9116 CXXConstructorDecl *Constructor, 9117 MultiExprArg Exprs, 9118 bool HadMultipleCandidates) { 9119 // FIXME: Provide the correct paren SourceRange when available. 9120 ExprResult TempResult = 9121 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9122 Exprs, HadMultipleCandidates, false, 9123 CXXConstructExpr::CK_Complete, SourceRange()); 9124 if (TempResult.isInvalid()) 9125 return true; 9126 9127 Expr *Temp = TempResult.takeAs<Expr>(); 9128 CheckImplicitConversions(Temp, VD->getLocation()); 9129 MarkFunctionReferenced(VD->getLocation(), Constructor); 9130 Temp = MaybeCreateExprWithCleanups(Temp); 9131 VD->setInit(Temp); 9132 9133 return false; 9134} 9135 9136void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9137 if (VD->isInvalidDecl()) return; 9138 9139 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9140 if (ClassDecl->isInvalidDecl()) return; 9141 if (ClassDecl->hasIrrelevantDestructor()) return; 9142 if (ClassDecl->isDependentContext()) return; 9143 9144 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9145 MarkFunctionReferenced(VD->getLocation(), Destructor); 9146 CheckDestructorAccess(VD->getLocation(), Destructor, 9147 PDiag(diag::err_access_dtor_var) 9148 << VD->getDeclName() 9149 << VD->getType()); 9150 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9151 9152 if (!VD->hasGlobalStorage()) return; 9153 9154 // Emit warning for non-trivial dtor in global scope (a real global, 9155 // class-static, function-static). 9156 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9157 9158 // TODO: this should be re-enabled for static locals by !CXAAtExit 9159 if (!VD->isStaticLocal()) 9160 Diag(VD->getLocation(), diag::warn_global_destructor); 9161} 9162 9163/// \brief Given a constructor and the set of arguments provided for the 9164/// constructor, convert the arguments and add any required default arguments 9165/// to form a proper call to this constructor. 9166/// 9167/// \returns true if an error occurred, false otherwise. 9168bool 9169Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9170 MultiExprArg ArgsPtr, 9171 SourceLocation Loc, 9172 SmallVectorImpl<Expr*> &ConvertedArgs, 9173 bool AllowExplicit) { 9174 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9175 unsigned NumArgs = ArgsPtr.size(); 9176 Expr **Args = ArgsPtr.data(); 9177 9178 const FunctionProtoType *Proto 9179 = Constructor->getType()->getAs<FunctionProtoType>(); 9180 assert(Proto && "Constructor without a prototype?"); 9181 unsigned NumArgsInProto = Proto->getNumArgs(); 9182 9183 // If too few arguments are available, we'll fill in the rest with defaults. 9184 if (NumArgs < NumArgsInProto) 9185 ConvertedArgs.reserve(NumArgsInProto); 9186 else 9187 ConvertedArgs.reserve(NumArgs); 9188 9189 VariadicCallType CallType = 9190 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9191 SmallVector<Expr *, 8> AllArgs; 9192 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9193 Proto, 0, Args, NumArgs, AllArgs, 9194 CallType, AllowExplicit); 9195 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9196 9197 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9198 9199 CheckConstructorCall(Constructor, AllArgs.data(), AllArgs.size(), 9200 Proto, Loc); 9201 9202 return Invalid; 9203} 9204 9205static inline bool 9206CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9207 const FunctionDecl *FnDecl) { 9208 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9209 if (isa<NamespaceDecl>(DC)) { 9210 return SemaRef.Diag(FnDecl->getLocation(), 9211 diag::err_operator_new_delete_declared_in_namespace) 9212 << FnDecl->getDeclName(); 9213 } 9214 9215 if (isa<TranslationUnitDecl>(DC) && 9216 FnDecl->getStorageClass() == SC_Static) { 9217 return SemaRef.Diag(FnDecl->getLocation(), 9218 diag::err_operator_new_delete_declared_static) 9219 << FnDecl->getDeclName(); 9220 } 9221 9222 return false; 9223} 9224 9225static inline bool 9226CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9227 CanQualType ExpectedResultType, 9228 CanQualType ExpectedFirstParamType, 9229 unsigned DependentParamTypeDiag, 9230 unsigned InvalidParamTypeDiag) { 9231 QualType ResultType = 9232 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9233 9234 // Check that the result type is not dependent. 9235 if (ResultType->isDependentType()) 9236 return SemaRef.Diag(FnDecl->getLocation(), 9237 diag::err_operator_new_delete_dependent_result_type) 9238 << FnDecl->getDeclName() << ExpectedResultType; 9239 9240 // Check that the result type is what we expect. 9241 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9242 return SemaRef.Diag(FnDecl->getLocation(), 9243 diag::err_operator_new_delete_invalid_result_type) 9244 << FnDecl->getDeclName() << ExpectedResultType; 9245 9246 // A function template must have at least 2 parameters. 9247 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9248 return SemaRef.Diag(FnDecl->getLocation(), 9249 diag::err_operator_new_delete_template_too_few_parameters) 9250 << FnDecl->getDeclName(); 9251 9252 // The function decl must have at least 1 parameter. 9253 if (FnDecl->getNumParams() == 0) 9254 return SemaRef.Diag(FnDecl->getLocation(), 9255 diag::err_operator_new_delete_too_few_parameters) 9256 << FnDecl->getDeclName(); 9257 9258 // Check the first parameter type is not dependent. 9259 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9260 if (FirstParamType->isDependentType()) 9261 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9262 << FnDecl->getDeclName() << ExpectedFirstParamType; 9263 9264 // Check that the first parameter type is what we expect. 9265 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9266 ExpectedFirstParamType) 9267 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9268 << FnDecl->getDeclName() << ExpectedFirstParamType; 9269 9270 return false; 9271} 9272 9273static bool 9274CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9275 // C++ [basic.stc.dynamic.allocation]p1: 9276 // A program is ill-formed if an allocation function is declared in a 9277 // namespace scope other than global scope or declared static in global 9278 // scope. 9279 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9280 return true; 9281 9282 CanQualType SizeTy = 9283 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9284 9285 // C++ [basic.stc.dynamic.allocation]p1: 9286 // The return type shall be void*. The first parameter shall have type 9287 // std::size_t. 9288 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9289 SizeTy, 9290 diag::err_operator_new_dependent_param_type, 9291 diag::err_operator_new_param_type)) 9292 return true; 9293 9294 // C++ [basic.stc.dynamic.allocation]p1: 9295 // The first parameter shall not have an associated default argument. 9296 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9297 return SemaRef.Diag(FnDecl->getLocation(), 9298 diag::err_operator_new_default_arg) 9299 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9300 9301 return false; 9302} 9303 9304static bool 9305CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9306 // C++ [basic.stc.dynamic.deallocation]p1: 9307 // A program is ill-formed if deallocation functions are declared in a 9308 // namespace scope other than global scope or declared static in global 9309 // scope. 9310 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9311 return true; 9312 9313 // C++ [basic.stc.dynamic.deallocation]p2: 9314 // Each deallocation function shall return void and its first parameter 9315 // shall be void*. 9316 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9317 SemaRef.Context.VoidPtrTy, 9318 diag::err_operator_delete_dependent_param_type, 9319 diag::err_operator_delete_param_type)) 9320 return true; 9321 9322 return false; 9323} 9324 9325/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9326/// of this overloaded operator is well-formed. If so, returns false; 9327/// otherwise, emits appropriate diagnostics and returns true. 9328bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9329 assert(FnDecl && FnDecl->isOverloadedOperator() && 9330 "Expected an overloaded operator declaration"); 9331 9332 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9333 9334 // C++ [over.oper]p5: 9335 // The allocation and deallocation functions, operator new, 9336 // operator new[], operator delete and operator delete[], are 9337 // described completely in 3.7.3. The attributes and restrictions 9338 // found in the rest of this subclause do not apply to them unless 9339 // explicitly stated in 3.7.3. 9340 if (Op == OO_Delete || Op == OO_Array_Delete) 9341 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9342 9343 if (Op == OO_New || Op == OO_Array_New) 9344 return CheckOperatorNewDeclaration(*this, FnDecl); 9345 9346 // C++ [over.oper]p6: 9347 // An operator function shall either be a non-static member 9348 // function or be a non-member function and have at least one 9349 // parameter whose type is a class, a reference to a class, an 9350 // enumeration, or a reference to an enumeration. 9351 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9352 if (MethodDecl->isStatic()) 9353 return Diag(FnDecl->getLocation(), 9354 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9355 } else { 9356 bool ClassOrEnumParam = false; 9357 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9358 ParamEnd = FnDecl->param_end(); 9359 Param != ParamEnd; ++Param) { 9360 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9361 if (ParamType->isDependentType() || ParamType->isRecordType() || 9362 ParamType->isEnumeralType()) { 9363 ClassOrEnumParam = true; 9364 break; 9365 } 9366 } 9367 9368 if (!ClassOrEnumParam) 9369 return Diag(FnDecl->getLocation(), 9370 diag::err_operator_overload_needs_class_or_enum) 9371 << FnDecl->getDeclName(); 9372 } 9373 9374 // C++ [over.oper]p8: 9375 // An operator function cannot have default arguments (8.3.6), 9376 // except where explicitly stated below. 9377 // 9378 // Only the function-call operator allows default arguments 9379 // (C++ [over.call]p1). 9380 if (Op != OO_Call) { 9381 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9382 Param != FnDecl->param_end(); ++Param) { 9383 if ((*Param)->hasDefaultArg()) 9384 return Diag((*Param)->getLocation(), 9385 diag::err_operator_overload_default_arg) 9386 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9387 } 9388 } 9389 9390 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9391 { false, false, false } 9392#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9393 , { Unary, Binary, MemberOnly } 9394#include "clang/Basic/OperatorKinds.def" 9395 }; 9396 9397 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9398 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9399 bool MustBeMemberOperator = OperatorUses[Op][2]; 9400 9401 // C++ [over.oper]p8: 9402 // [...] Operator functions cannot have more or fewer parameters 9403 // than the number required for the corresponding operator, as 9404 // described in the rest of this subclause. 9405 unsigned NumParams = FnDecl->getNumParams() 9406 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9407 if (Op != OO_Call && 9408 ((NumParams == 1 && !CanBeUnaryOperator) || 9409 (NumParams == 2 && !CanBeBinaryOperator) || 9410 (NumParams < 1) || (NumParams > 2))) { 9411 // We have the wrong number of parameters. 9412 unsigned ErrorKind; 9413 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9414 ErrorKind = 2; // 2 -> unary or binary. 9415 } else if (CanBeUnaryOperator) { 9416 ErrorKind = 0; // 0 -> unary 9417 } else { 9418 assert(CanBeBinaryOperator && 9419 "All non-call overloaded operators are unary or binary!"); 9420 ErrorKind = 1; // 1 -> binary 9421 } 9422 9423 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9424 << FnDecl->getDeclName() << NumParams << ErrorKind; 9425 } 9426 9427 // Overloaded operators other than operator() cannot be variadic. 9428 if (Op != OO_Call && 9429 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9430 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9431 << FnDecl->getDeclName(); 9432 } 9433 9434 // Some operators must be non-static member functions. 9435 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9436 return Diag(FnDecl->getLocation(), 9437 diag::err_operator_overload_must_be_member) 9438 << FnDecl->getDeclName(); 9439 } 9440 9441 // C++ [over.inc]p1: 9442 // The user-defined function called operator++ implements the 9443 // prefix and postfix ++ operator. If this function is a member 9444 // function with no parameters, or a non-member function with one 9445 // parameter of class or enumeration type, it defines the prefix 9446 // increment operator ++ for objects of that type. If the function 9447 // is a member function with one parameter (which shall be of type 9448 // int) or a non-member function with two parameters (the second 9449 // of which shall be of type int), it defines the postfix 9450 // increment operator ++ for objects of that type. 9451 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9452 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9453 bool ParamIsInt = false; 9454 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9455 ParamIsInt = BT->getKind() == BuiltinType::Int; 9456 9457 if (!ParamIsInt) 9458 return Diag(LastParam->getLocation(), 9459 diag::err_operator_overload_post_incdec_must_be_int) 9460 << LastParam->getType() << (Op == OO_MinusMinus); 9461 } 9462 9463 return false; 9464} 9465 9466/// CheckLiteralOperatorDeclaration - Check whether the declaration 9467/// of this literal operator function is well-formed. If so, returns 9468/// false; otherwise, emits appropriate diagnostics and returns true. 9469bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9470 if (isa<CXXMethodDecl>(FnDecl)) { 9471 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9472 << FnDecl->getDeclName(); 9473 return true; 9474 } 9475 9476 if (FnDecl->isExternC()) { 9477 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 9478 return true; 9479 } 9480 9481 bool Valid = false; 9482 9483 // This might be the definition of a literal operator template. 9484 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 9485 // This might be a specialization of a literal operator template. 9486 if (!TpDecl) 9487 TpDecl = FnDecl->getPrimaryTemplate(); 9488 9489 // template <char...> type operator "" name() is the only valid template 9490 // signature, and the only valid signature with no parameters. 9491 if (TpDecl) { 9492 if (FnDecl->param_size() == 0) { 9493 // Must have only one template parameter 9494 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9495 if (Params->size() == 1) { 9496 NonTypeTemplateParmDecl *PmDecl = 9497 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9498 9499 // The template parameter must be a char parameter pack. 9500 if (PmDecl && PmDecl->isTemplateParameterPack() && 9501 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9502 Valid = true; 9503 } 9504 } 9505 } else if (FnDecl->param_size()) { 9506 // Check the first parameter 9507 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9508 9509 QualType T = (*Param)->getType().getUnqualifiedType(); 9510 9511 // unsigned long long int, long double, and any character type are allowed 9512 // as the only parameters. 9513 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9514 Context.hasSameType(T, Context.LongDoubleTy) || 9515 Context.hasSameType(T, Context.CharTy) || 9516 Context.hasSameType(T, Context.WCharTy) || 9517 Context.hasSameType(T, Context.Char16Ty) || 9518 Context.hasSameType(T, Context.Char32Ty)) { 9519 if (++Param == FnDecl->param_end()) 9520 Valid = true; 9521 goto FinishedParams; 9522 } 9523 9524 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9525 const PointerType *PT = T->getAs<PointerType>(); 9526 if (!PT) 9527 goto FinishedParams; 9528 T = PT->getPointeeType(); 9529 if (!T.isConstQualified() || T.isVolatileQualified()) 9530 goto FinishedParams; 9531 T = T.getUnqualifiedType(); 9532 9533 // Move on to the second parameter; 9534 ++Param; 9535 9536 // If there is no second parameter, the first must be a const char * 9537 if (Param == FnDecl->param_end()) { 9538 if (Context.hasSameType(T, Context.CharTy)) 9539 Valid = true; 9540 goto FinishedParams; 9541 } 9542 9543 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9544 // are allowed as the first parameter to a two-parameter function 9545 if (!(Context.hasSameType(T, Context.CharTy) || 9546 Context.hasSameType(T, Context.WCharTy) || 9547 Context.hasSameType(T, Context.Char16Ty) || 9548 Context.hasSameType(T, Context.Char32Ty))) 9549 goto FinishedParams; 9550 9551 // The second and final parameter must be an std::size_t 9552 T = (*Param)->getType().getUnqualifiedType(); 9553 if (Context.hasSameType(T, Context.getSizeType()) && 9554 ++Param == FnDecl->param_end()) 9555 Valid = true; 9556 } 9557 9558 // FIXME: This diagnostic is absolutely terrible. 9559FinishedParams: 9560 if (!Valid) { 9561 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9562 << FnDecl->getDeclName(); 9563 return true; 9564 } 9565 9566 // A parameter-declaration-clause containing a default argument is not 9567 // equivalent to any of the permitted forms. 9568 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9569 ParamEnd = FnDecl->param_end(); 9570 Param != ParamEnd; ++Param) { 9571 if ((*Param)->hasDefaultArg()) { 9572 Diag((*Param)->getDefaultArgRange().getBegin(), 9573 diag::err_literal_operator_default_argument) 9574 << (*Param)->getDefaultArgRange(); 9575 break; 9576 } 9577 } 9578 9579 StringRef LiteralName 9580 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9581 if (LiteralName[0] != '_') { 9582 // C++11 [usrlit.suffix]p1: 9583 // Literal suffix identifiers that do not start with an underscore 9584 // are reserved for future standardization. 9585 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9586 } 9587 9588 return false; 9589} 9590 9591/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9592/// linkage specification, including the language and (if present) 9593/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9594/// the location of the language string literal, which is provided 9595/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9596/// the '{' brace. Otherwise, this linkage specification does not 9597/// have any braces. 9598Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9599 SourceLocation LangLoc, 9600 StringRef Lang, 9601 SourceLocation LBraceLoc) { 9602 LinkageSpecDecl::LanguageIDs Language; 9603 if (Lang == "\"C\"") 9604 Language = LinkageSpecDecl::lang_c; 9605 else if (Lang == "\"C++\"") 9606 Language = LinkageSpecDecl::lang_cxx; 9607 else { 9608 Diag(LangLoc, diag::err_bad_language); 9609 return 0; 9610 } 9611 9612 // FIXME: Add all the various semantics of linkage specifications 9613 9614 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9615 ExternLoc, LangLoc, Language); 9616 CurContext->addDecl(D); 9617 PushDeclContext(S, D); 9618 return D; 9619} 9620 9621/// ActOnFinishLinkageSpecification - Complete the definition of 9622/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9623/// valid, it's the position of the closing '}' brace in a linkage 9624/// specification that uses braces. 9625Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9626 Decl *LinkageSpec, 9627 SourceLocation RBraceLoc) { 9628 if (LinkageSpec) { 9629 if (RBraceLoc.isValid()) { 9630 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9631 LSDecl->setRBraceLoc(RBraceLoc); 9632 } 9633 PopDeclContext(); 9634 } 9635 return LinkageSpec; 9636} 9637 9638/// \brief Perform semantic analysis for the variable declaration that 9639/// occurs within a C++ catch clause, returning the newly-created 9640/// variable. 9641VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9642 TypeSourceInfo *TInfo, 9643 SourceLocation StartLoc, 9644 SourceLocation Loc, 9645 IdentifierInfo *Name) { 9646 bool Invalid = false; 9647 QualType ExDeclType = TInfo->getType(); 9648 9649 // Arrays and functions decay. 9650 if (ExDeclType->isArrayType()) 9651 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9652 else if (ExDeclType->isFunctionType()) 9653 ExDeclType = Context.getPointerType(ExDeclType); 9654 9655 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9656 // The exception-declaration shall not denote a pointer or reference to an 9657 // incomplete type, other than [cv] void*. 9658 // N2844 forbids rvalue references. 9659 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9660 Diag(Loc, diag::err_catch_rvalue_ref); 9661 Invalid = true; 9662 } 9663 9664 QualType BaseType = ExDeclType; 9665 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9666 unsigned DK = diag::err_catch_incomplete; 9667 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9668 BaseType = Ptr->getPointeeType(); 9669 Mode = 1; 9670 DK = diag::err_catch_incomplete_ptr; 9671 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9672 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9673 BaseType = Ref->getPointeeType(); 9674 Mode = 2; 9675 DK = diag::err_catch_incomplete_ref; 9676 } 9677 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9678 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9679 Invalid = true; 9680 9681 if (!Invalid && !ExDeclType->isDependentType() && 9682 RequireNonAbstractType(Loc, ExDeclType, 9683 diag::err_abstract_type_in_decl, 9684 AbstractVariableType)) 9685 Invalid = true; 9686 9687 // Only the non-fragile NeXT runtime currently supports C++ catches 9688 // of ObjC types, and no runtime supports catching ObjC types by value. 9689 if (!Invalid && getLangOpts().ObjC1) { 9690 QualType T = ExDeclType; 9691 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9692 T = RT->getPointeeType(); 9693 9694 if (T->isObjCObjectType()) { 9695 Diag(Loc, diag::err_objc_object_catch); 9696 Invalid = true; 9697 } else if (T->isObjCObjectPointerType()) { 9698 // FIXME: should this be a test for macosx-fragile specifically? 9699 if (getLangOpts().ObjCRuntime.isFragile()) 9700 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9701 } 9702 } 9703 9704 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9705 ExDeclType, TInfo, SC_None, SC_None); 9706 ExDecl->setExceptionVariable(true); 9707 9708 // In ARC, infer 'retaining' for variables of retainable type. 9709 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9710 Invalid = true; 9711 9712 if (!Invalid && !ExDeclType->isDependentType()) { 9713 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9714 // C++ [except.handle]p16: 9715 // The object declared in an exception-declaration or, if the 9716 // exception-declaration does not specify a name, a temporary (12.2) is 9717 // copy-initialized (8.5) from the exception object. [...] 9718 // The object is destroyed when the handler exits, after the destruction 9719 // of any automatic objects initialized within the handler. 9720 // 9721 // We just pretend to initialize the object with itself, then make sure 9722 // it can be destroyed later. 9723 QualType initType = ExDeclType; 9724 9725 InitializedEntity entity = 9726 InitializedEntity::InitializeVariable(ExDecl); 9727 InitializationKind initKind = 9728 InitializationKind::CreateCopy(Loc, SourceLocation()); 9729 9730 Expr *opaqueValue = 9731 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9732 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9733 ExprResult result = sequence.Perform(*this, entity, initKind, 9734 MultiExprArg(&opaqueValue, 1)); 9735 if (result.isInvalid()) 9736 Invalid = true; 9737 else { 9738 // If the constructor used was non-trivial, set this as the 9739 // "initializer". 9740 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9741 if (!construct->getConstructor()->isTrivial()) { 9742 Expr *init = MaybeCreateExprWithCleanups(construct); 9743 ExDecl->setInit(init); 9744 } 9745 9746 // And make sure it's destructable. 9747 FinalizeVarWithDestructor(ExDecl, recordType); 9748 } 9749 } 9750 } 9751 9752 if (Invalid) 9753 ExDecl->setInvalidDecl(); 9754 9755 return ExDecl; 9756} 9757 9758/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9759/// handler. 9760Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9761 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9762 bool Invalid = D.isInvalidType(); 9763 9764 // Check for unexpanded parameter packs. 9765 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9766 UPPC_ExceptionType)) { 9767 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9768 D.getIdentifierLoc()); 9769 Invalid = true; 9770 } 9771 9772 IdentifierInfo *II = D.getIdentifier(); 9773 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9774 LookupOrdinaryName, 9775 ForRedeclaration)) { 9776 // The scope should be freshly made just for us. There is just no way 9777 // it contains any previous declaration. 9778 assert(!S->isDeclScope(PrevDecl)); 9779 if (PrevDecl->isTemplateParameter()) { 9780 // Maybe we will complain about the shadowed template parameter. 9781 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9782 PrevDecl = 0; 9783 } 9784 } 9785 9786 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9787 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9788 << D.getCXXScopeSpec().getRange(); 9789 Invalid = true; 9790 } 9791 9792 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9793 D.getLocStart(), 9794 D.getIdentifierLoc(), 9795 D.getIdentifier()); 9796 if (Invalid) 9797 ExDecl->setInvalidDecl(); 9798 9799 // Add the exception declaration into this scope. 9800 if (II) 9801 PushOnScopeChains(ExDecl, S); 9802 else 9803 CurContext->addDecl(ExDecl); 9804 9805 ProcessDeclAttributes(S, ExDecl, D); 9806 return ExDecl; 9807} 9808 9809Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9810 Expr *AssertExpr, 9811 Expr *AssertMessageExpr, 9812 SourceLocation RParenLoc) { 9813 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 9814 9815 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9816 return 0; 9817 9818 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 9819 AssertMessage, RParenLoc, false); 9820} 9821 9822Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9823 Expr *AssertExpr, 9824 StringLiteral *AssertMessage, 9825 SourceLocation RParenLoc, 9826 bool Failed) { 9827 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 9828 !Failed) { 9829 // In a static_assert-declaration, the constant-expression shall be a 9830 // constant expression that can be contextually converted to bool. 9831 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9832 if (Converted.isInvalid()) 9833 Failed = true; 9834 9835 llvm::APSInt Cond; 9836 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 9837 diag::err_static_assert_expression_is_not_constant, 9838 /*AllowFold=*/false).isInvalid()) 9839 Failed = true; 9840 9841 if (!Failed && !Cond) { 9842 llvm::SmallString<256> MsgBuffer; 9843 llvm::raw_svector_ostream Msg(MsgBuffer); 9844 AssertMessage->printPretty(Msg, 0, getPrintingPolicy()); 9845 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9846 << Msg.str() << AssertExpr->getSourceRange(); 9847 Failed = true; 9848 } 9849 } 9850 9851 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9852 AssertExpr, AssertMessage, RParenLoc, 9853 Failed); 9854 9855 CurContext->addDecl(Decl); 9856 return Decl; 9857} 9858 9859/// \brief Perform semantic analysis of the given friend type declaration. 9860/// 9861/// \returns A friend declaration that. 9862FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart, 9863 SourceLocation FriendLoc, 9864 TypeSourceInfo *TSInfo) { 9865 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9866 9867 QualType T = TSInfo->getType(); 9868 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9869 9870 // C++03 [class.friend]p2: 9871 // An elaborated-type-specifier shall be used in a friend declaration 9872 // for a class.* 9873 // 9874 // * The class-key of the elaborated-type-specifier is required. 9875 if (!ActiveTemplateInstantiations.empty()) { 9876 // Do not complain about the form of friend template types during 9877 // template instantiation; we will already have complained when the 9878 // template was declared. 9879 } else if (!T->isElaboratedTypeSpecifier()) { 9880 // If we evaluated the type to a record type, suggest putting 9881 // a tag in front. 9882 if (const RecordType *RT = T->getAs<RecordType>()) { 9883 RecordDecl *RD = RT->getDecl(); 9884 9885 std::string InsertionText = std::string(" ") + RD->getKindName(); 9886 9887 Diag(TypeRange.getBegin(), 9888 getLangOpts().CPlusPlus0x ? 9889 diag::warn_cxx98_compat_unelaborated_friend_type : 9890 diag::ext_unelaborated_friend_type) 9891 << (unsigned) RD->getTagKind() 9892 << T 9893 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9894 InsertionText); 9895 } else { 9896 Diag(FriendLoc, 9897 getLangOpts().CPlusPlus0x ? 9898 diag::warn_cxx98_compat_nonclass_type_friend : 9899 diag::ext_nonclass_type_friend) 9900 << T 9901 << TypeRange; 9902 } 9903 } else if (T->getAs<EnumType>()) { 9904 Diag(FriendLoc, 9905 getLangOpts().CPlusPlus0x ? 9906 diag::warn_cxx98_compat_enum_friend : 9907 diag::ext_enum_friend) 9908 << T 9909 << TypeRange; 9910 } 9911 9912 // C++11 [class.friend]p3: 9913 // A friend declaration that does not declare a function shall have one 9914 // of the following forms: 9915 // friend elaborated-type-specifier ; 9916 // friend simple-type-specifier ; 9917 // friend typename-specifier ; 9918 if (getLangOpts().CPlusPlus0x && LocStart != FriendLoc) 9919 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T; 9920 9921 // If the type specifier in a friend declaration designates a (possibly 9922 // cv-qualified) class type, that class is declared as a friend; otherwise, 9923 // the friend declaration is ignored. 9924 return FriendDecl::Create(Context, CurContext, LocStart, TSInfo, FriendLoc); 9925} 9926 9927/// Handle a friend tag declaration where the scope specifier was 9928/// templated. 9929Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9930 unsigned TagSpec, SourceLocation TagLoc, 9931 CXXScopeSpec &SS, 9932 IdentifierInfo *Name, SourceLocation NameLoc, 9933 AttributeList *Attr, 9934 MultiTemplateParamsArg TempParamLists) { 9935 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9936 9937 bool isExplicitSpecialization = false; 9938 bool Invalid = false; 9939 9940 if (TemplateParameterList *TemplateParams 9941 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9942 TempParamLists.data(), 9943 TempParamLists.size(), 9944 /*friend*/ true, 9945 isExplicitSpecialization, 9946 Invalid)) { 9947 if (TemplateParams->size() > 0) { 9948 // This is a declaration of a class template. 9949 if (Invalid) 9950 return 0; 9951 9952 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9953 SS, Name, NameLoc, Attr, 9954 TemplateParams, AS_public, 9955 /*ModulePrivateLoc=*/SourceLocation(), 9956 TempParamLists.size() - 1, 9957 TempParamLists.data()).take(); 9958 } else { 9959 // The "template<>" header is extraneous. 9960 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9961 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9962 isExplicitSpecialization = true; 9963 } 9964 } 9965 9966 if (Invalid) return 0; 9967 9968 bool isAllExplicitSpecializations = true; 9969 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9970 if (TempParamLists[I]->size()) { 9971 isAllExplicitSpecializations = false; 9972 break; 9973 } 9974 } 9975 9976 // FIXME: don't ignore attributes. 9977 9978 // If it's explicit specializations all the way down, just forget 9979 // about the template header and build an appropriate non-templated 9980 // friend. TODO: for source fidelity, remember the headers. 9981 if (isAllExplicitSpecializations) { 9982 if (SS.isEmpty()) { 9983 bool Owned = false; 9984 bool IsDependent = false; 9985 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9986 Attr, AS_public, 9987 /*ModulePrivateLoc=*/SourceLocation(), 9988 MultiTemplateParamsArg(), Owned, IsDependent, 9989 /*ScopedEnumKWLoc=*/SourceLocation(), 9990 /*ScopedEnumUsesClassTag=*/false, 9991 /*UnderlyingType=*/TypeResult()); 9992 } 9993 9994 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9995 ElaboratedTypeKeyword Keyword 9996 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9997 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9998 *Name, NameLoc); 9999 if (T.isNull()) 10000 return 0; 10001 10002 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10003 if (isa<DependentNameType>(T)) { 10004 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10005 TL.setElaboratedKeywordLoc(TagLoc); 10006 TL.setQualifierLoc(QualifierLoc); 10007 TL.setNameLoc(NameLoc); 10008 } else { 10009 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 10010 TL.setElaboratedKeywordLoc(TagLoc); 10011 TL.setQualifierLoc(QualifierLoc); 10012 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 10013 } 10014 10015 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10016 TSI, FriendLoc); 10017 Friend->setAccess(AS_public); 10018 CurContext->addDecl(Friend); 10019 return Friend; 10020 } 10021 10022 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 10023 10024 10025 10026 // Handle the case of a templated-scope friend class. e.g. 10027 // template <class T> class A<T>::B; 10028 // FIXME: we don't support these right now. 10029 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10030 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10031 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10032 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10033 TL.setElaboratedKeywordLoc(TagLoc); 10034 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10035 TL.setNameLoc(NameLoc); 10036 10037 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10038 TSI, FriendLoc); 10039 Friend->setAccess(AS_public); 10040 Friend->setUnsupportedFriend(true); 10041 CurContext->addDecl(Friend); 10042 return Friend; 10043} 10044 10045 10046/// Handle a friend type declaration. This works in tandem with 10047/// ActOnTag. 10048/// 10049/// Notes on friend class templates: 10050/// 10051/// We generally treat friend class declarations as if they were 10052/// declaring a class. So, for example, the elaborated type specifier 10053/// in a friend declaration is required to obey the restrictions of a 10054/// class-head (i.e. no typedefs in the scope chain), template 10055/// parameters are required to match up with simple template-ids, &c. 10056/// However, unlike when declaring a template specialization, it's 10057/// okay to refer to a template specialization without an empty 10058/// template parameter declaration, e.g. 10059/// friend class A<T>::B<unsigned>; 10060/// We permit this as a special case; if there are any template 10061/// parameters present at all, require proper matching, i.e. 10062/// template <> template \<class T> friend class A<int>::B; 10063Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10064 MultiTemplateParamsArg TempParams) { 10065 SourceLocation Loc = DS.getLocStart(); 10066 10067 assert(DS.isFriendSpecified()); 10068 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10069 10070 // Try to convert the decl specifier to a type. This works for 10071 // friend templates because ActOnTag never produces a ClassTemplateDecl 10072 // for a TUK_Friend. 10073 Declarator TheDeclarator(DS, Declarator::MemberContext); 10074 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10075 QualType T = TSI->getType(); 10076 if (TheDeclarator.isInvalidType()) 10077 return 0; 10078 10079 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10080 return 0; 10081 10082 // This is definitely an error in C++98. It's probably meant to 10083 // be forbidden in C++0x, too, but the specification is just 10084 // poorly written. 10085 // 10086 // The problem is with declarations like the following: 10087 // template <T> friend A<T>::foo; 10088 // where deciding whether a class C is a friend or not now hinges 10089 // on whether there exists an instantiation of A that causes 10090 // 'foo' to equal C. There are restrictions on class-heads 10091 // (which we declare (by fiat) elaborated friend declarations to 10092 // be) that makes this tractable. 10093 // 10094 // FIXME: handle "template <> friend class A<T>;", which 10095 // is possibly well-formed? Who even knows? 10096 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10097 Diag(Loc, diag::err_tagless_friend_type_template) 10098 << DS.getSourceRange(); 10099 return 0; 10100 } 10101 10102 // C++98 [class.friend]p1: A friend of a class is a function 10103 // or class that is not a member of the class . . . 10104 // This is fixed in DR77, which just barely didn't make the C++03 10105 // deadline. It's also a very silly restriction that seriously 10106 // affects inner classes and which nobody else seems to implement; 10107 // thus we never diagnose it, not even in -pedantic. 10108 // 10109 // But note that we could warn about it: it's always useless to 10110 // friend one of your own members (it's not, however, worthless to 10111 // friend a member of an arbitrary specialization of your template). 10112 10113 Decl *D; 10114 if (unsigned NumTempParamLists = TempParams.size()) 10115 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10116 NumTempParamLists, 10117 TempParams.data(), 10118 TSI, 10119 DS.getFriendSpecLoc()); 10120 else 10121 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10122 10123 if (!D) 10124 return 0; 10125 10126 D->setAccess(AS_public); 10127 CurContext->addDecl(D); 10128 10129 return D; 10130} 10131 10132Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10133 MultiTemplateParamsArg TemplateParams) { 10134 const DeclSpec &DS = D.getDeclSpec(); 10135 10136 assert(DS.isFriendSpecified()); 10137 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10138 10139 SourceLocation Loc = D.getIdentifierLoc(); 10140 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10141 10142 // C++ [class.friend]p1 10143 // A friend of a class is a function or class.... 10144 // Note that this sees through typedefs, which is intended. 10145 // It *doesn't* see through dependent types, which is correct 10146 // according to [temp.arg.type]p3: 10147 // If a declaration acquires a function type through a 10148 // type dependent on a template-parameter and this causes 10149 // a declaration that does not use the syntactic form of a 10150 // function declarator to have a function type, the program 10151 // is ill-formed. 10152 if (!TInfo->getType()->isFunctionType()) { 10153 Diag(Loc, diag::err_unexpected_friend); 10154 10155 // It might be worthwhile to try to recover by creating an 10156 // appropriate declaration. 10157 return 0; 10158 } 10159 10160 // C++ [namespace.memdef]p3 10161 // - If a friend declaration in a non-local class first declares a 10162 // class or function, the friend class or function is a member 10163 // of the innermost enclosing namespace. 10164 // - The name of the friend is not found by simple name lookup 10165 // until a matching declaration is provided in that namespace 10166 // scope (either before or after the class declaration granting 10167 // friendship). 10168 // - If a friend function is called, its name may be found by the 10169 // name lookup that considers functions from namespaces and 10170 // classes associated with the types of the function arguments. 10171 // - When looking for a prior declaration of a class or a function 10172 // declared as a friend, scopes outside the innermost enclosing 10173 // namespace scope are not considered. 10174 10175 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10176 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10177 DeclarationName Name = NameInfo.getName(); 10178 assert(Name); 10179 10180 // Check for unexpanded parameter packs. 10181 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10182 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10183 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10184 return 0; 10185 10186 // The context we found the declaration in, or in which we should 10187 // create the declaration. 10188 DeclContext *DC; 10189 Scope *DCScope = S; 10190 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10191 ForRedeclaration); 10192 10193 // FIXME: there are different rules in local classes 10194 10195 // There are four cases here. 10196 // - There's no scope specifier, in which case we just go to the 10197 // appropriate scope and look for a function or function template 10198 // there as appropriate. 10199 // Recover from invalid scope qualifiers as if they just weren't there. 10200 if (SS.isInvalid() || !SS.isSet()) { 10201 // C++0x [namespace.memdef]p3: 10202 // If the name in a friend declaration is neither qualified nor 10203 // a template-id and the declaration is a function or an 10204 // elaborated-type-specifier, the lookup to determine whether 10205 // the entity has been previously declared shall not consider 10206 // any scopes outside the innermost enclosing namespace. 10207 // C++0x [class.friend]p11: 10208 // If a friend declaration appears in a local class and the name 10209 // specified is an unqualified name, a prior declaration is 10210 // looked up without considering scopes that are outside the 10211 // innermost enclosing non-class scope. For a friend function 10212 // declaration, if there is no prior declaration, the program is 10213 // ill-formed. 10214 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10215 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10216 10217 // Find the appropriate context according to the above. 10218 DC = CurContext; 10219 while (true) { 10220 // Skip class contexts. If someone can cite chapter and verse 10221 // for this behavior, that would be nice --- it's what GCC and 10222 // EDG do, and it seems like a reasonable intent, but the spec 10223 // really only says that checks for unqualified existing 10224 // declarations should stop at the nearest enclosing namespace, 10225 // not that they should only consider the nearest enclosing 10226 // namespace. 10227 while (DC->isRecord() || DC->isTransparentContext()) 10228 DC = DC->getParent(); 10229 10230 LookupQualifiedName(Previous, DC); 10231 10232 // TODO: decide what we think about using declarations. 10233 if (isLocal || !Previous.empty()) 10234 break; 10235 10236 if (isTemplateId) { 10237 if (isa<TranslationUnitDecl>(DC)) break; 10238 } else { 10239 if (DC->isFileContext()) break; 10240 } 10241 DC = DC->getParent(); 10242 } 10243 10244 // C++ [class.friend]p1: A friend of a class is a function or 10245 // class that is not a member of the class . . . 10246 // C++11 changes this for both friend types and functions. 10247 // Most C++ 98 compilers do seem to give an error here, so 10248 // we do, too. 10249 if (!Previous.empty() && DC->Equals(CurContext)) 10250 Diag(DS.getFriendSpecLoc(), 10251 getLangOpts().CPlusPlus0x ? 10252 diag::warn_cxx98_compat_friend_is_member : 10253 diag::err_friend_is_member); 10254 10255 DCScope = getScopeForDeclContext(S, DC); 10256 10257 // C++ [class.friend]p6: 10258 // A function can be defined in a friend declaration of a class if and 10259 // only if the class is a non-local class (9.8), the function name is 10260 // unqualified, and the function has namespace scope. 10261 if (isLocal && D.isFunctionDefinition()) { 10262 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10263 } 10264 10265 // - There's a non-dependent scope specifier, in which case we 10266 // compute it and do a previous lookup there for a function 10267 // or function template. 10268 } else if (!SS.getScopeRep()->isDependent()) { 10269 DC = computeDeclContext(SS); 10270 if (!DC) return 0; 10271 10272 if (RequireCompleteDeclContext(SS, DC)) return 0; 10273 10274 LookupQualifiedName(Previous, DC); 10275 10276 // Ignore things found implicitly in the wrong scope. 10277 // TODO: better diagnostics for this case. Suggesting the right 10278 // qualified scope would be nice... 10279 LookupResult::Filter F = Previous.makeFilter(); 10280 while (F.hasNext()) { 10281 NamedDecl *D = F.next(); 10282 if (!DC->InEnclosingNamespaceSetOf( 10283 D->getDeclContext()->getRedeclContext())) 10284 F.erase(); 10285 } 10286 F.done(); 10287 10288 if (Previous.empty()) { 10289 D.setInvalidType(); 10290 Diag(Loc, diag::err_qualified_friend_not_found) 10291 << Name << TInfo->getType(); 10292 return 0; 10293 } 10294 10295 // C++ [class.friend]p1: A friend of a class is a function or 10296 // class that is not a member of the class . . . 10297 if (DC->Equals(CurContext)) 10298 Diag(DS.getFriendSpecLoc(), 10299 getLangOpts().CPlusPlus0x ? 10300 diag::warn_cxx98_compat_friend_is_member : 10301 diag::err_friend_is_member); 10302 10303 if (D.isFunctionDefinition()) { 10304 // C++ [class.friend]p6: 10305 // A function can be defined in a friend declaration of a class if and 10306 // only if the class is a non-local class (9.8), the function name is 10307 // unqualified, and the function has namespace scope. 10308 SemaDiagnosticBuilder DB 10309 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10310 10311 DB << SS.getScopeRep(); 10312 if (DC->isFileContext()) 10313 DB << FixItHint::CreateRemoval(SS.getRange()); 10314 SS.clear(); 10315 } 10316 10317 // - There's a scope specifier that does not match any template 10318 // parameter lists, in which case we use some arbitrary context, 10319 // create a method or method template, and wait for instantiation. 10320 // - There's a scope specifier that does match some template 10321 // parameter lists, which we don't handle right now. 10322 } else { 10323 if (D.isFunctionDefinition()) { 10324 // C++ [class.friend]p6: 10325 // A function can be defined in a friend declaration of a class if and 10326 // only if the class is a non-local class (9.8), the function name is 10327 // unqualified, and the function has namespace scope. 10328 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10329 << SS.getScopeRep(); 10330 } 10331 10332 DC = CurContext; 10333 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10334 } 10335 10336 if (!DC->isRecord()) { 10337 // This implies that it has to be an operator or function. 10338 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10339 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10340 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10341 Diag(Loc, diag::err_introducing_special_friend) << 10342 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10343 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10344 return 0; 10345 } 10346 } 10347 10348 // FIXME: This is an egregious hack to cope with cases where the scope stack 10349 // does not contain the declaration context, i.e., in an out-of-line 10350 // definition of a class. 10351 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10352 if (!DCScope) { 10353 FakeDCScope.setEntity(DC); 10354 DCScope = &FakeDCScope; 10355 } 10356 10357 bool AddToScope = true; 10358 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10359 TemplateParams, AddToScope); 10360 if (!ND) return 0; 10361 10362 assert(ND->getDeclContext() == DC); 10363 assert(ND->getLexicalDeclContext() == CurContext); 10364 10365 // Add the function declaration to the appropriate lookup tables, 10366 // adjusting the redeclarations list as necessary. We don't 10367 // want to do this yet if the friending class is dependent. 10368 // 10369 // Also update the scope-based lookup if the target context's 10370 // lookup context is in lexical scope. 10371 if (!CurContext->isDependentContext()) { 10372 DC = DC->getRedeclContext(); 10373 DC->makeDeclVisibleInContext(ND); 10374 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10375 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10376 } 10377 10378 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10379 D.getIdentifierLoc(), ND, 10380 DS.getFriendSpecLoc()); 10381 FrD->setAccess(AS_public); 10382 CurContext->addDecl(FrD); 10383 10384 if (ND->isInvalidDecl()) { 10385 FrD->setInvalidDecl(); 10386 } else { 10387 if (DC->isRecord()) CheckFriendAccess(ND); 10388 10389 FunctionDecl *FD; 10390 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10391 FD = FTD->getTemplatedDecl(); 10392 else 10393 FD = cast<FunctionDecl>(ND); 10394 10395 // Mark templated-scope function declarations as unsupported. 10396 if (FD->getNumTemplateParameterLists()) 10397 FrD->setUnsupportedFriend(true); 10398 } 10399 10400 return ND; 10401} 10402 10403void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10404 AdjustDeclIfTemplate(Dcl); 10405 10406 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10407 if (!Fn) { 10408 Diag(DelLoc, diag::err_deleted_non_function); 10409 return; 10410 } 10411 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10412 // Don't consider the implicit declaration we generate for explicit 10413 // specializations. FIXME: Do not generate these implicit declarations. 10414 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 10415 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 10416 Diag(DelLoc, diag::err_deleted_decl_not_first); 10417 Diag(Prev->getLocation(), diag::note_previous_declaration); 10418 } 10419 // If the declaration wasn't the first, we delete the function anyway for 10420 // recovery. 10421 } 10422 Fn->setDeletedAsWritten(); 10423 10424 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10425 if (!MD) 10426 return; 10427 10428 // A deleted special member function is trivial if the corresponding 10429 // implicitly-declared function would have been. 10430 switch (getSpecialMember(MD)) { 10431 case CXXInvalid: 10432 break; 10433 case CXXDefaultConstructor: 10434 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor()); 10435 break; 10436 case CXXCopyConstructor: 10437 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor()); 10438 break; 10439 case CXXMoveConstructor: 10440 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor()); 10441 break; 10442 case CXXCopyAssignment: 10443 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 10444 break; 10445 case CXXMoveAssignment: 10446 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 10447 break; 10448 case CXXDestructor: 10449 MD->setTrivial(MD->getParent()->hasTrivialDestructor()); 10450 break; 10451 } 10452} 10453 10454void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10455 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10456 10457 if (MD) { 10458 if (MD->getParent()->isDependentType()) { 10459 MD->setDefaulted(); 10460 MD->setExplicitlyDefaulted(); 10461 return; 10462 } 10463 10464 CXXSpecialMember Member = getSpecialMember(MD); 10465 if (Member == CXXInvalid) { 10466 Diag(DefaultLoc, diag::err_default_special_members); 10467 return; 10468 } 10469 10470 MD->setDefaulted(); 10471 MD->setExplicitlyDefaulted(); 10472 10473 // If this definition appears within the record, do the checking when 10474 // the record is complete. 10475 const FunctionDecl *Primary = MD; 10476 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern()) 10477 // Find the uninstantiated declaration that actually had the '= default' 10478 // on it. 10479 Pattern->isDefined(Primary); 10480 10481 if (Primary == Primary->getCanonicalDecl()) 10482 return; 10483 10484 CheckExplicitlyDefaultedSpecialMember(MD); 10485 10486 switch (Member) { 10487 case CXXDefaultConstructor: { 10488 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10489 if (!CD->isInvalidDecl()) 10490 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10491 break; 10492 } 10493 10494 case CXXCopyConstructor: { 10495 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10496 if (!CD->isInvalidDecl()) 10497 DefineImplicitCopyConstructor(DefaultLoc, CD); 10498 break; 10499 } 10500 10501 case CXXCopyAssignment: { 10502 if (!MD->isInvalidDecl()) 10503 DefineImplicitCopyAssignment(DefaultLoc, MD); 10504 break; 10505 } 10506 10507 case CXXDestructor: { 10508 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10509 if (!DD->isInvalidDecl()) 10510 DefineImplicitDestructor(DefaultLoc, DD); 10511 break; 10512 } 10513 10514 case CXXMoveConstructor: { 10515 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10516 if (!CD->isInvalidDecl()) 10517 DefineImplicitMoveConstructor(DefaultLoc, CD); 10518 break; 10519 } 10520 10521 case CXXMoveAssignment: { 10522 if (!MD->isInvalidDecl()) 10523 DefineImplicitMoveAssignment(DefaultLoc, MD); 10524 break; 10525 } 10526 10527 case CXXInvalid: 10528 llvm_unreachable("Invalid special member."); 10529 } 10530 } else { 10531 Diag(DefaultLoc, diag::err_default_special_members); 10532 } 10533} 10534 10535static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10536 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10537 Stmt *SubStmt = *CI; 10538 if (!SubStmt) 10539 continue; 10540 if (isa<ReturnStmt>(SubStmt)) 10541 Self.Diag(SubStmt->getLocStart(), 10542 diag::err_return_in_constructor_handler); 10543 if (!isa<Expr>(SubStmt)) 10544 SearchForReturnInStmt(Self, SubStmt); 10545 } 10546} 10547 10548void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10549 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10550 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10551 SearchForReturnInStmt(*this, Handler); 10552 } 10553} 10554 10555bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10556 const CXXMethodDecl *Old) { 10557 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10558 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10559 10560 if (Context.hasSameType(NewTy, OldTy) || 10561 NewTy->isDependentType() || OldTy->isDependentType()) 10562 return false; 10563 10564 // Check if the return types are covariant 10565 QualType NewClassTy, OldClassTy; 10566 10567 /// Both types must be pointers or references to classes. 10568 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10569 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10570 NewClassTy = NewPT->getPointeeType(); 10571 OldClassTy = OldPT->getPointeeType(); 10572 } 10573 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10574 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10575 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10576 NewClassTy = NewRT->getPointeeType(); 10577 OldClassTy = OldRT->getPointeeType(); 10578 } 10579 } 10580 } 10581 10582 // The return types aren't either both pointers or references to a class type. 10583 if (NewClassTy.isNull()) { 10584 Diag(New->getLocation(), 10585 diag::err_different_return_type_for_overriding_virtual_function) 10586 << New->getDeclName() << NewTy << OldTy; 10587 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10588 10589 return true; 10590 } 10591 10592 // C++ [class.virtual]p6: 10593 // If the return type of D::f differs from the return type of B::f, the 10594 // class type in the return type of D::f shall be complete at the point of 10595 // declaration of D::f or shall be the class type D. 10596 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10597 if (!RT->isBeingDefined() && 10598 RequireCompleteType(New->getLocation(), NewClassTy, 10599 diag::err_covariant_return_incomplete, 10600 New->getDeclName())) 10601 return true; 10602 } 10603 10604 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10605 // Check if the new class derives from the old class. 10606 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10607 Diag(New->getLocation(), 10608 diag::err_covariant_return_not_derived) 10609 << New->getDeclName() << NewTy << OldTy; 10610 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10611 return true; 10612 } 10613 10614 // Check if we the conversion from derived to base is valid. 10615 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10616 diag::err_covariant_return_inaccessible_base, 10617 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10618 // FIXME: Should this point to the return type? 10619 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10620 // FIXME: this note won't trigger for delayed access control 10621 // diagnostics, and it's impossible to get an undelayed error 10622 // here from access control during the original parse because 10623 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10624 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10625 return true; 10626 } 10627 } 10628 10629 // The qualifiers of the return types must be the same. 10630 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10631 Diag(New->getLocation(), 10632 diag::err_covariant_return_type_different_qualifications) 10633 << New->getDeclName() << NewTy << OldTy; 10634 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10635 return true; 10636 }; 10637 10638 10639 // The new class type must have the same or less qualifiers as the old type. 10640 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10641 Diag(New->getLocation(), 10642 diag::err_covariant_return_type_class_type_more_qualified) 10643 << New->getDeclName() << NewTy << OldTy; 10644 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10645 return true; 10646 }; 10647 10648 return false; 10649} 10650 10651/// \brief Mark the given method pure. 10652/// 10653/// \param Method the method to be marked pure. 10654/// 10655/// \param InitRange the source range that covers the "0" initializer. 10656bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10657 SourceLocation EndLoc = InitRange.getEnd(); 10658 if (EndLoc.isValid()) 10659 Method->setRangeEnd(EndLoc); 10660 10661 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10662 Method->setPure(); 10663 return false; 10664 } 10665 10666 if (!Method->isInvalidDecl()) 10667 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10668 << Method->getDeclName() << InitRange; 10669 return true; 10670} 10671 10672/// \brief Determine whether the given declaration is a static data member. 10673static bool isStaticDataMember(Decl *D) { 10674 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10675 if (!Var) 10676 return false; 10677 10678 return Var->isStaticDataMember(); 10679} 10680/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10681/// an initializer for the out-of-line declaration 'Dcl'. The scope 10682/// is a fresh scope pushed for just this purpose. 10683/// 10684/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10685/// static data member of class X, names should be looked up in the scope of 10686/// class X. 10687void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10688 // If there is no declaration, there was an error parsing it. 10689 if (D == 0 || D->isInvalidDecl()) return; 10690 10691 // We should only get called for declarations with scope specifiers, like: 10692 // int foo::bar; 10693 assert(D->isOutOfLine()); 10694 EnterDeclaratorContext(S, D->getDeclContext()); 10695 10696 // If we are parsing the initializer for a static data member, push a 10697 // new expression evaluation context that is associated with this static 10698 // data member. 10699 if (isStaticDataMember(D)) 10700 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10701} 10702 10703/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10704/// initializer for the out-of-line declaration 'D'. 10705void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10706 // If there is no declaration, there was an error parsing it. 10707 if (D == 0 || D->isInvalidDecl()) return; 10708 10709 if (isStaticDataMember(D)) 10710 PopExpressionEvaluationContext(); 10711 10712 assert(D->isOutOfLine()); 10713 ExitDeclaratorContext(S); 10714} 10715 10716/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10717/// C++ if/switch/while/for statement. 10718/// e.g: "if (int x = f()) {...}" 10719DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10720 // C++ 6.4p2: 10721 // The declarator shall not specify a function or an array. 10722 // The type-specifier-seq shall not contain typedef and shall not declare a 10723 // new class or enumeration. 10724 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10725 "Parser allowed 'typedef' as storage class of condition decl."); 10726 10727 Decl *Dcl = ActOnDeclarator(S, D); 10728 if (!Dcl) 10729 return true; 10730 10731 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10732 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10733 << D.getSourceRange(); 10734 return true; 10735 } 10736 10737 return Dcl; 10738} 10739 10740void Sema::LoadExternalVTableUses() { 10741 if (!ExternalSource) 10742 return; 10743 10744 SmallVector<ExternalVTableUse, 4> VTables; 10745 ExternalSource->ReadUsedVTables(VTables); 10746 SmallVector<VTableUse, 4> NewUses; 10747 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10748 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10749 = VTablesUsed.find(VTables[I].Record); 10750 // Even if a definition wasn't required before, it may be required now. 10751 if (Pos != VTablesUsed.end()) { 10752 if (!Pos->second && VTables[I].DefinitionRequired) 10753 Pos->second = true; 10754 continue; 10755 } 10756 10757 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10758 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10759 } 10760 10761 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10762} 10763 10764void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10765 bool DefinitionRequired) { 10766 // Ignore any vtable uses in unevaluated operands or for classes that do 10767 // not have a vtable. 10768 if (!Class->isDynamicClass() || Class->isDependentContext() || 10769 CurContext->isDependentContext() || 10770 ExprEvalContexts.back().Context == Unevaluated) 10771 return; 10772 10773 // Try to insert this class into the map. 10774 LoadExternalVTableUses(); 10775 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10776 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10777 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10778 if (!Pos.second) { 10779 // If we already had an entry, check to see if we are promoting this vtable 10780 // to required a definition. If so, we need to reappend to the VTableUses 10781 // list, since we may have already processed the first entry. 10782 if (DefinitionRequired && !Pos.first->second) { 10783 Pos.first->second = true; 10784 } else { 10785 // Otherwise, we can early exit. 10786 return; 10787 } 10788 } 10789 10790 // Local classes need to have their virtual members marked 10791 // immediately. For all other classes, we mark their virtual members 10792 // at the end of the translation unit. 10793 if (Class->isLocalClass()) 10794 MarkVirtualMembersReferenced(Loc, Class); 10795 else 10796 VTableUses.push_back(std::make_pair(Class, Loc)); 10797} 10798 10799bool Sema::DefineUsedVTables() { 10800 LoadExternalVTableUses(); 10801 if (VTableUses.empty()) 10802 return false; 10803 10804 // Note: The VTableUses vector could grow as a result of marking 10805 // the members of a class as "used", so we check the size each 10806 // time through the loop and prefer indices (which are stable) to 10807 // iterators (which are not). 10808 bool DefinedAnything = false; 10809 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10810 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10811 if (!Class) 10812 continue; 10813 10814 SourceLocation Loc = VTableUses[I].second; 10815 10816 bool DefineVTable = true; 10817 10818 // If this class has a key function, but that key function is 10819 // defined in another translation unit, we don't need to emit the 10820 // vtable even though we're using it. 10821 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10822 if (KeyFunction && !KeyFunction->hasBody()) { 10823 switch (KeyFunction->getTemplateSpecializationKind()) { 10824 case TSK_Undeclared: 10825 case TSK_ExplicitSpecialization: 10826 case TSK_ExplicitInstantiationDeclaration: 10827 // The key function is in another translation unit. 10828 DefineVTable = false; 10829 break; 10830 10831 case TSK_ExplicitInstantiationDefinition: 10832 case TSK_ImplicitInstantiation: 10833 // We will be instantiating the key function. 10834 break; 10835 } 10836 } else if (!KeyFunction) { 10837 // If we have a class with no key function that is the subject 10838 // of an explicit instantiation declaration, suppress the 10839 // vtable; it will live with the explicit instantiation 10840 // definition. 10841 bool IsExplicitInstantiationDeclaration 10842 = Class->getTemplateSpecializationKind() 10843 == TSK_ExplicitInstantiationDeclaration; 10844 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10845 REnd = Class->redecls_end(); 10846 R != REnd; ++R) { 10847 TemplateSpecializationKind TSK 10848 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10849 if (TSK == TSK_ExplicitInstantiationDeclaration) 10850 IsExplicitInstantiationDeclaration = true; 10851 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10852 IsExplicitInstantiationDeclaration = false; 10853 break; 10854 } 10855 } 10856 10857 if (IsExplicitInstantiationDeclaration) 10858 DefineVTable = false; 10859 } 10860 10861 // The exception specifications for all virtual members may be needed even 10862 // if we are not providing an authoritative form of the vtable in this TU. 10863 // We may choose to emit it available_externally anyway. 10864 if (!DefineVTable) { 10865 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 10866 continue; 10867 } 10868 10869 // Mark all of the virtual members of this class as referenced, so 10870 // that we can build a vtable. Then, tell the AST consumer that a 10871 // vtable for this class is required. 10872 DefinedAnything = true; 10873 MarkVirtualMembersReferenced(Loc, Class); 10874 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10875 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10876 10877 // Optionally warn if we're emitting a weak vtable. 10878 if (Class->getLinkage() == ExternalLinkage && 10879 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10880 const FunctionDecl *KeyFunctionDef = 0; 10881 if (!KeyFunction || 10882 (KeyFunction->hasBody(KeyFunctionDef) && 10883 KeyFunctionDef->isInlined())) 10884 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10885 TSK_ExplicitInstantiationDefinition 10886 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10887 << Class; 10888 } 10889 } 10890 VTableUses.clear(); 10891 10892 return DefinedAnything; 10893} 10894 10895void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 10896 const CXXRecordDecl *RD) { 10897 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 10898 E = RD->method_end(); I != E; ++I) 10899 if ((*I)->isVirtual() && !(*I)->isPure()) 10900 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 10901} 10902 10903void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10904 const CXXRecordDecl *RD) { 10905 // Mark all functions which will appear in RD's vtable as used. 10906 CXXFinalOverriderMap FinalOverriders; 10907 RD->getFinalOverriders(FinalOverriders); 10908 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 10909 E = FinalOverriders.end(); 10910 I != E; ++I) { 10911 for (OverridingMethods::const_iterator OI = I->second.begin(), 10912 OE = I->second.end(); 10913 OI != OE; ++OI) { 10914 assert(OI->second.size() > 0 && "no final overrider"); 10915 CXXMethodDecl *Overrider = OI->second.front().Method; 10916 10917 // C++ [basic.def.odr]p2: 10918 // [...] A virtual member function is used if it is not pure. [...] 10919 if (!Overrider->isPure()) 10920 MarkFunctionReferenced(Loc, Overrider); 10921 } 10922 } 10923 10924 // Only classes that have virtual bases need a VTT. 10925 if (RD->getNumVBases() == 0) 10926 return; 10927 10928 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10929 e = RD->bases_end(); i != e; ++i) { 10930 const CXXRecordDecl *Base = 10931 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10932 if (Base->getNumVBases() == 0) 10933 continue; 10934 MarkVirtualMembersReferenced(Loc, Base); 10935 } 10936} 10937 10938/// SetIvarInitializers - This routine builds initialization ASTs for the 10939/// Objective-C implementation whose ivars need be initialized. 10940void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10941 if (!getLangOpts().CPlusPlus) 10942 return; 10943 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10944 SmallVector<ObjCIvarDecl*, 8> ivars; 10945 CollectIvarsToConstructOrDestruct(OID, ivars); 10946 if (ivars.empty()) 10947 return; 10948 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10949 for (unsigned i = 0; i < ivars.size(); i++) { 10950 FieldDecl *Field = ivars[i]; 10951 if (Field->isInvalidDecl()) 10952 continue; 10953 10954 CXXCtorInitializer *Member; 10955 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10956 InitializationKind InitKind = 10957 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10958 10959 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10960 ExprResult MemberInit = 10961 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10962 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10963 // Note, MemberInit could actually come back empty if no initialization 10964 // is required (e.g., because it would call a trivial default constructor) 10965 if (!MemberInit.get() || MemberInit.isInvalid()) 10966 continue; 10967 10968 Member = 10969 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10970 SourceLocation(), 10971 MemberInit.takeAs<Expr>(), 10972 SourceLocation()); 10973 AllToInit.push_back(Member); 10974 10975 // Be sure that the destructor is accessible and is marked as referenced. 10976 if (const RecordType *RecordTy 10977 = Context.getBaseElementType(Field->getType()) 10978 ->getAs<RecordType>()) { 10979 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10980 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10981 MarkFunctionReferenced(Field->getLocation(), Destructor); 10982 CheckDestructorAccess(Field->getLocation(), Destructor, 10983 PDiag(diag::err_access_dtor_ivar) 10984 << Context.getBaseElementType(Field->getType())); 10985 } 10986 } 10987 } 10988 ObjCImplementation->setIvarInitializers(Context, 10989 AllToInit.data(), AllToInit.size()); 10990 } 10991} 10992 10993static 10994void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10995 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10996 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10997 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10998 Sema &S) { 10999 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11000 CE = Current.end(); 11001 if (Ctor->isInvalidDecl()) 11002 return; 11003 11004 CXXConstructorDecl *Target = Ctor->getTargetConstructor(); 11005 11006 // Target may not be determinable yet, for instance if this is a dependent 11007 // call in an uninstantiated template. 11008 if (Target) { 11009 const FunctionDecl *FNTarget = 0; 11010 (void)Target->hasBody(FNTarget); 11011 Target = const_cast<CXXConstructorDecl*>( 11012 cast_or_null<CXXConstructorDecl>(FNTarget)); 11013 } 11014 11015 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 11016 // Avoid dereferencing a null pointer here. 11017 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 11018 11019 if (!Current.insert(Canonical)) 11020 return; 11021 11022 // We know that beyond here, we aren't chaining into a cycle. 11023 if (!Target || !Target->isDelegatingConstructor() || 11024 Target->isInvalidDecl() || Valid.count(TCanonical)) { 11025 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11026 Valid.insert(*CI); 11027 Current.clear(); 11028 // We've hit a cycle. 11029 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 11030 Current.count(TCanonical)) { 11031 // If we haven't diagnosed this cycle yet, do so now. 11032 if (!Invalid.count(TCanonical)) { 11033 S.Diag((*Ctor->init_begin())->getSourceLocation(), 11034 diag::warn_delegating_ctor_cycle) 11035 << Ctor; 11036 11037 // Don't add a note for a function delegating directly to itself. 11038 if (TCanonical != Canonical) 11039 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11040 11041 CXXConstructorDecl *C = Target; 11042 while (C->getCanonicalDecl() != Canonical) { 11043 const FunctionDecl *FNTarget = 0; 11044 (void)C->getTargetConstructor()->hasBody(FNTarget); 11045 assert(FNTarget && "Ctor cycle through bodiless function"); 11046 11047 C = const_cast<CXXConstructorDecl*>( 11048 cast<CXXConstructorDecl>(FNTarget)); 11049 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11050 } 11051 } 11052 11053 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11054 Invalid.insert(*CI); 11055 Current.clear(); 11056 } else { 11057 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11058 } 11059} 11060 11061 11062void Sema::CheckDelegatingCtorCycles() { 11063 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11064 11065 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11066 CE = Current.end(); 11067 11068 for (DelegatingCtorDeclsType::iterator 11069 I = DelegatingCtorDecls.begin(ExternalSource), 11070 E = DelegatingCtorDecls.end(); 11071 I != E; ++I) 11072 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11073 11074 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11075 (*CI)->setInvalidDecl(); 11076} 11077 11078namespace { 11079 /// \brief AST visitor that finds references to the 'this' expression. 11080 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 11081 Sema &S; 11082 11083 public: 11084 explicit FindCXXThisExpr(Sema &S) : S(S) { } 11085 11086 bool VisitCXXThisExpr(CXXThisExpr *E) { 11087 S.Diag(E->getLocation(), diag::err_this_static_member_func) 11088 << E->isImplicit(); 11089 return false; 11090 } 11091 }; 11092} 11093 11094bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 11095 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11096 if (!TSInfo) 11097 return false; 11098 11099 TypeLoc TL = TSInfo->getTypeLoc(); 11100 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11101 if (!ProtoTL) 11102 return false; 11103 11104 // C++11 [expr.prim.general]p3: 11105 // [The expression this] shall not appear before the optional 11106 // cv-qualifier-seq and it shall not appear within the declaration of a 11107 // static member function (although its type and value category are defined 11108 // within a static member function as they are within a non-static member 11109 // function). [ Note: this is because declaration matching does not occur 11110 // until the complete declarator is known. - end note ] 11111 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11112 FindCXXThisExpr Finder(*this); 11113 11114 // If the return type came after the cv-qualifier-seq, check it now. 11115 if (Proto->hasTrailingReturn() && 11116 !Finder.TraverseTypeLoc(ProtoTL->getResultLoc())) 11117 return true; 11118 11119 // Check the exception specification. 11120 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 11121 return true; 11122 11123 return checkThisInStaticMemberFunctionAttributes(Method); 11124} 11125 11126bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 11127 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11128 if (!TSInfo) 11129 return false; 11130 11131 TypeLoc TL = TSInfo->getTypeLoc(); 11132 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11133 if (!ProtoTL) 11134 return false; 11135 11136 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11137 FindCXXThisExpr Finder(*this); 11138 11139 switch (Proto->getExceptionSpecType()) { 11140 case EST_Uninstantiated: 11141 case EST_Unevaluated: 11142 case EST_BasicNoexcept: 11143 case EST_DynamicNone: 11144 case EST_MSAny: 11145 case EST_None: 11146 break; 11147 11148 case EST_ComputedNoexcept: 11149 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11150 return true; 11151 11152 case EST_Dynamic: 11153 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11154 EEnd = Proto->exception_end(); 11155 E != EEnd; ++E) { 11156 if (!Finder.TraverseType(*E)) 11157 return true; 11158 } 11159 break; 11160 } 11161 11162 return false; 11163} 11164 11165bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11166 FindCXXThisExpr Finder(*this); 11167 11168 // Check attributes. 11169 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11170 A != AEnd; ++A) { 11171 // FIXME: This should be emitted by tblgen. 11172 Expr *Arg = 0; 11173 ArrayRef<Expr *> Args; 11174 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11175 Arg = G->getArg(); 11176 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11177 Arg = G->getArg(); 11178 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11179 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11180 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11181 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11182 else if (ExclusiveLockFunctionAttr *ELF 11183 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11184 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11185 else if (SharedLockFunctionAttr *SLF 11186 = dyn_cast<SharedLockFunctionAttr>(*A)) 11187 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11188 else if (ExclusiveTrylockFunctionAttr *ETLF 11189 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11190 Arg = ETLF->getSuccessValue(); 11191 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11192 } else if (SharedTrylockFunctionAttr *STLF 11193 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11194 Arg = STLF->getSuccessValue(); 11195 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11196 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11197 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11198 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11199 Arg = LR->getArg(); 11200 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11201 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11202 else if (ExclusiveLocksRequiredAttr *ELR 11203 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11204 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11205 else if (SharedLocksRequiredAttr *SLR 11206 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11207 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11208 11209 if (Arg && !Finder.TraverseStmt(Arg)) 11210 return true; 11211 11212 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11213 if (!Finder.TraverseStmt(Args[I])) 11214 return true; 11215 } 11216 } 11217 11218 return false; 11219} 11220 11221void 11222Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 11223 ArrayRef<ParsedType> DynamicExceptions, 11224 ArrayRef<SourceRange> DynamicExceptionRanges, 11225 Expr *NoexceptExpr, 11226 llvm::SmallVectorImpl<QualType> &Exceptions, 11227 FunctionProtoType::ExtProtoInfo &EPI) { 11228 Exceptions.clear(); 11229 EPI.ExceptionSpecType = EST; 11230 if (EST == EST_Dynamic) { 11231 Exceptions.reserve(DynamicExceptions.size()); 11232 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 11233 // FIXME: Preserve type source info. 11234 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 11235 11236 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 11237 collectUnexpandedParameterPacks(ET, Unexpanded); 11238 if (!Unexpanded.empty()) { 11239 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 11240 UPPC_ExceptionType, 11241 Unexpanded); 11242 continue; 11243 } 11244 11245 // Check that the type is valid for an exception spec, and 11246 // drop it if not. 11247 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 11248 Exceptions.push_back(ET); 11249 } 11250 EPI.NumExceptions = Exceptions.size(); 11251 EPI.Exceptions = Exceptions.data(); 11252 return; 11253 } 11254 11255 if (EST == EST_ComputedNoexcept) { 11256 // If an error occurred, there's no expression here. 11257 if (NoexceptExpr) { 11258 assert((NoexceptExpr->isTypeDependent() || 11259 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 11260 Context.BoolTy) && 11261 "Parser should have made sure that the expression is boolean"); 11262 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 11263 EPI.ExceptionSpecType = EST_BasicNoexcept; 11264 return; 11265 } 11266 11267 if (!NoexceptExpr->isValueDependent()) 11268 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 11269 diag::err_noexcept_needs_constant_expression, 11270 /*AllowFold*/ false).take(); 11271 EPI.NoexceptExpr = NoexceptExpr; 11272 } 11273 return; 11274 } 11275} 11276 11277/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11278Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11279 // Implicitly declared functions (e.g. copy constructors) are 11280 // __host__ __device__ 11281 if (D->isImplicit()) 11282 return CFT_HostDevice; 11283 11284 if (D->hasAttr<CUDAGlobalAttr>()) 11285 return CFT_Global; 11286 11287 if (D->hasAttr<CUDADeviceAttr>()) { 11288 if (D->hasAttr<CUDAHostAttr>()) 11289 return CFT_HostDevice; 11290 else 11291 return CFT_Device; 11292 } 11293 11294 return CFT_Host; 11295} 11296 11297bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11298 CUDAFunctionTarget CalleeTarget) { 11299 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11300 // Callable from the device only." 11301 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11302 return true; 11303 11304 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11305 // Callable from the host only." 11306 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11307 // Callable from the host only." 11308 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11309 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11310 return true; 11311 11312 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11313 return true; 11314 11315 return false; 11316} 11317