SemaDeclCXX.cpp revision eef00293897a73cc47f4d42e2653ff47c59d6030
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, 250 MultiExprArg(*this, &Arg, 1)); 251 if (Result.isInvalid()) 252 return true; 253 Arg = Result.takeAs<Expr>(); 254 255 CheckImplicitConversions(Arg, EqualLoc); 256 Arg = MaybeCreateExprWithCleanups(Arg); 257 258 // Okay: add the default argument to the parameter 259 Param->setDefaultArg(Arg); 260 261 // We have already instantiated this parameter; provide each of the 262 // instantiations with the uninstantiated default argument. 263 UnparsedDefaultArgInstantiationsMap::iterator InstPos 264 = UnparsedDefaultArgInstantiations.find(Param); 265 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 266 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 267 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 268 269 // We're done tracking this parameter's instantiations. 270 UnparsedDefaultArgInstantiations.erase(InstPos); 271 } 272 273 return false; 274} 275 276/// ActOnParamDefaultArgument - Check whether the default argument 277/// provided for a function parameter is well-formed. If so, attach it 278/// to the parameter declaration. 279void 280Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 281 Expr *DefaultArg) { 282 if (!param || !DefaultArg) 283 return; 284 285 ParmVarDecl *Param = cast<ParmVarDecl>(param); 286 UnparsedDefaultArgLocs.erase(Param); 287 288 // Default arguments are only permitted in C++ 289 if (!getLangOpts().CPlusPlus) { 290 Diag(EqualLoc, diag::err_param_default_argument) 291 << DefaultArg->getSourceRange(); 292 Param->setInvalidDecl(); 293 return; 294 } 295 296 // Check for unexpanded parameter packs. 297 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 298 Param->setInvalidDecl(); 299 return; 300 } 301 302 // Check that the default argument is well-formed 303 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 304 if (DefaultArgChecker.Visit(DefaultArg)) { 305 Param->setInvalidDecl(); 306 return; 307 } 308 309 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 310} 311 312/// ActOnParamUnparsedDefaultArgument - We've seen a default 313/// argument for a function parameter, but we can't parse it yet 314/// because we're inside a class definition. Note that this default 315/// argument will be parsed later. 316void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 317 SourceLocation EqualLoc, 318 SourceLocation ArgLoc) { 319 if (!param) 320 return; 321 322 ParmVarDecl *Param = cast<ParmVarDecl>(param); 323 if (Param) 324 Param->setUnparsedDefaultArg(); 325 326 UnparsedDefaultArgLocs[Param] = ArgLoc; 327} 328 329/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 330/// the default argument for the parameter param failed. 331void Sema::ActOnParamDefaultArgumentError(Decl *param) { 332 if (!param) 333 return; 334 335 ParmVarDecl *Param = cast<ParmVarDecl>(param); 336 337 Param->setInvalidDecl(); 338 339 UnparsedDefaultArgLocs.erase(Param); 340} 341 342/// CheckExtraCXXDefaultArguments - Check for any extra default 343/// arguments in the declarator, which is not a function declaration 344/// or definition and therefore is not permitted to have default 345/// arguments. This routine should be invoked for every declarator 346/// that is not a function declaration or definition. 347void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 348 // C++ [dcl.fct.default]p3 349 // A default argument expression shall be specified only in the 350 // parameter-declaration-clause of a function declaration or in a 351 // template-parameter (14.1). It shall not be specified for a 352 // parameter pack. If it is specified in a 353 // parameter-declaration-clause, it shall not occur within a 354 // declarator or abstract-declarator of a parameter-declaration. 355 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 356 DeclaratorChunk &chunk = D.getTypeObject(i); 357 if (chunk.Kind == DeclaratorChunk::Function) { 358 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 359 ParmVarDecl *Param = 360 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 361 if (Param->hasUnparsedDefaultArg()) { 362 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 363 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 364 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 365 delete Toks; 366 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 367 } else if (Param->getDefaultArg()) { 368 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 369 << Param->getDefaultArg()->getSourceRange(); 370 Param->setDefaultArg(0); 371 } 372 } 373 } 374 } 375} 376 377// MergeCXXFunctionDecl - Merge two declarations of the same C++ 378// function, once we already know that they have the same 379// type. Subroutine of MergeFunctionDecl. Returns true if there was an 380// error, false otherwise. 381bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, 382 Scope *S) { 383 bool Invalid = false; 384 385 // C++ [dcl.fct.default]p4: 386 // For non-template functions, default arguments can be added in 387 // later declarations of a function in the same 388 // scope. Declarations in different scopes have completely 389 // distinct sets of default arguments. That is, declarations in 390 // inner scopes do not acquire default arguments from 391 // declarations in outer scopes, and vice versa. In a given 392 // function declaration, all parameters subsequent to a 393 // parameter with a default argument shall have default 394 // arguments supplied in this or previous declarations. A 395 // default argument shall not be redefined by a later 396 // declaration (not even to the same value). 397 // 398 // C++ [dcl.fct.default]p6: 399 // Except for member functions of class templates, the default arguments 400 // in a member function definition that appears outside of the class 401 // definition are added to the set of default arguments provided by the 402 // member function declaration in the class definition. 403 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 404 ParmVarDecl *OldParam = Old->getParamDecl(p); 405 ParmVarDecl *NewParam = New->getParamDecl(p); 406 407 bool OldParamHasDfl = OldParam->hasDefaultArg(); 408 bool NewParamHasDfl = NewParam->hasDefaultArg(); 409 410 NamedDecl *ND = Old; 411 if (S && !isDeclInScope(ND, New->getDeclContext(), S)) 412 // Ignore default parameters of old decl if they are not in 413 // the same scope. 414 OldParamHasDfl = false; 415 416 if (OldParamHasDfl && NewParamHasDfl) { 417 418 unsigned DiagDefaultParamID = 419 diag::err_param_default_argument_redefinition; 420 421 // MSVC accepts that default parameters be redefined for member functions 422 // of template class. The new default parameter's value is ignored. 423 Invalid = true; 424 if (getLangOpts().MicrosoftExt) { 425 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 426 if (MD && MD->getParent()->getDescribedClassTemplate()) { 427 // Merge the old default argument into the new parameter. 428 NewParam->setHasInheritedDefaultArg(); 429 if (OldParam->hasUninstantiatedDefaultArg()) 430 NewParam->setUninstantiatedDefaultArg( 431 OldParam->getUninstantiatedDefaultArg()); 432 else 433 NewParam->setDefaultArg(OldParam->getInit()); 434 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 435 Invalid = false; 436 } 437 } 438 439 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 440 // hint here. Alternatively, we could walk the type-source information 441 // for NewParam to find the last source location in the type... but it 442 // isn't worth the effort right now. This is the kind of test case that 443 // is hard to get right: 444 // int f(int); 445 // void g(int (*fp)(int) = f); 446 // void g(int (*fp)(int) = &f); 447 Diag(NewParam->getLocation(), DiagDefaultParamID) 448 << NewParam->getDefaultArgRange(); 449 450 // Look for the function declaration where the default argument was 451 // actually written, which may be a declaration prior to Old. 452 for (FunctionDecl *Older = Old->getPreviousDecl(); 453 Older; Older = Older->getPreviousDecl()) { 454 if (!Older->getParamDecl(p)->hasDefaultArg()) 455 break; 456 457 OldParam = Older->getParamDecl(p); 458 } 459 460 Diag(OldParam->getLocation(), diag::note_previous_definition) 461 << OldParam->getDefaultArgRange(); 462 } else if (OldParamHasDfl) { 463 // Merge the old default argument into the new parameter. 464 // It's important to use getInit() here; getDefaultArg() 465 // strips off any top-level ExprWithCleanups. 466 NewParam->setHasInheritedDefaultArg(); 467 if (OldParam->hasUninstantiatedDefaultArg()) 468 NewParam->setUninstantiatedDefaultArg( 469 OldParam->getUninstantiatedDefaultArg()); 470 else 471 NewParam->setDefaultArg(OldParam->getInit()); 472 } else if (NewParamHasDfl) { 473 if (New->getDescribedFunctionTemplate()) { 474 // Paragraph 4, quoted above, only applies to non-template functions. 475 Diag(NewParam->getLocation(), 476 diag::err_param_default_argument_template_redecl) 477 << NewParam->getDefaultArgRange(); 478 Diag(Old->getLocation(), diag::note_template_prev_declaration) 479 << false; 480 } else if (New->getTemplateSpecializationKind() 481 != TSK_ImplicitInstantiation && 482 New->getTemplateSpecializationKind() != TSK_Undeclared) { 483 // C++ [temp.expr.spec]p21: 484 // Default function arguments shall not be specified in a declaration 485 // or a definition for one of the following explicit specializations: 486 // - the explicit specialization of a function template; 487 // - the explicit specialization of a member function template; 488 // - the explicit specialization of a member function of a class 489 // template where the class template specialization to which the 490 // member function specialization belongs is implicitly 491 // instantiated. 492 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 493 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 494 << New->getDeclName() 495 << NewParam->getDefaultArgRange(); 496 } else if (New->getDeclContext()->isDependentContext()) { 497 // C++ [dcl.fct.default]p6 (DR217): 498 // Default arguments for a member function of a class template shall 499 // be specified on the initial declaration of the member function 500 // within the class template. 501 // 502 // Reading the tea leaves a bit in DR217 and its reference to DR205 503 // leads me to the conclusion that one cannot add default function 504 // arguments for an out-of-line definition of a member function of a 505 // dependent type. 506 int WhichKind = 2; 507 if (CXXRecordDecl *Record 508 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 509 if (Record->getDescribedClassTemplate()) 510 WhichKind = 0; 511 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 512 WhichKind = 1; 513 else 514 WhichKind = 2; 515 } 516 517 Diag(NewParam->getLocation(), 518 diag::err_param_default_argument_member_template_redecl) 519 << WhichKind 520 << NewParam->getDefaultArgRange(); 521 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 522 CXXSpecialMember NewSM = getSpecialMember(Ctor), 523 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 524 if (NewSM != OldSM) { 525 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 526 << NewParam->getDefaultArgRange() << NewSM; 527 Diag(Old->getLocation(), diag::note_previous_declaration_special) 528 << OldSM; 529 } 530 } 531 } 532 } 533 534 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 535 // template has a constexpr specifier then all its declarations shall 536 // contain the constexpr specifier. 537 if (New->isConstexpr() != Old->isConstexpr()) { 538 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 539 << New << New->isConstexpr(); 540 Diag(Old->getLocation(), diag::note_previous_declaration); 541 Invalid = true; 542 } 543 544 if (CheckEquivalentExceptionSpec(Old, New)) 545 Invalid = true; 546 547 return Invalid; 548} 549 550/// \brief Merge the exception specifications of two variable declarations. 551/// 552/// This is called when there's a redeclaration of a VarDecl. The function 553/// checks if the redeclaration might have an exception specification and 554/// validates compatibility and merges the specs if necessary. 555void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 556 // Shortcut if exceptions are disabled. 557 if (!getLangOpts().CXXExceptions) 558 return; 559 560 assert(Context.hasSameType(New->getType(), Old->getType()) && 561 "Should only be called if types are otherwise the same."); 562 563 QualType NewType = New->getType(); 564 QualType OldType = Old->getType(); 565 566 // We're only interested in pointers and references to functions, as well 567 // as pointers to member functions. 568 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 569 NewType = R->getPointeeType(); 570 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 571 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 572 NewType = P->getPointeeType(); 573 OldType = OldType->getAs<PointerType>()->getPointeeType(); 574 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 575 NewType = M->getPointeeType(); 576 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 577 } 578 579 if (!NewType->isFunctionProtoType()) 580 return; 581 582 // There's lots of special cases for functions. For function pointers, system 583 // libraries are hopefully not as broken so that we don't need these 584 // workarounds. 585 if (CheckEquivalentExceptionSpec( 586 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 587 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 588 New->setInvalidDecl(); 589 } 590} 591 592/// CheckCXXDefaultArguments - Verify that the default arguments for a 593/// function declaration are well-formed according to C++ 594/// [dcl.fct.default]. 595void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 596 unsigned NumParams = FD->getNumParams(); 597 unsigned p; 598 599 bool IsLambda = FD->getOverloadedOperator() == OO_Call && 600 isa<CXXMethodDecl>(FD) && 601 cast<CXXMethodDecl>(FD)->getParent()->isLambda(); 602 603 // Find first parameter with a default argument 604 for (p = 0; p < NumParams; ++p) { 605 ParmVarDecl *Param = FD->getParamDecl(p); 606 if (Param->hasDefaultArg()) { 607 // C++11 [expr.prim.lambda]p5: 608 // [...] Default arguments (8.3.6) shall not be specified in the 609 // parameter-declaration-clause of a lambda-declarator. 610 // 611 // FIXME: Core issue 974 strikes this sentence, we only provide an 612 // extension warning. 613 if (IsLambda) 614 Diag(Param->getLocation(), diag::ext_lambda_default_arguments) 615 << Param->getDefaultArgRange(); 616 break; 617 } 618 } 619 620 // C++ [dcl.fct.default]p4: 621 // In a given function declaration, all parameters 622 // subsequent to a parameter with a default argument shall 623 // have default arguments supplied in this or previous 624 // declarations. A default argument shall not be redefined 625 // by a later declaration (not even to the same value). 626 unsigned LastMissingDefaultArg = 0; 627 for (; p < NumParams; ++p) { 628 ParmVarDecl *Param = FD->getParamDecl(p); 629 if (!Param->hasDefaultArg()) { 630 if (Param->isInvalidDecl()) 631 /* We already complained about this parameter. */; 632 else if (Param->getIdentifier()) 633 Diag(Param->getLocation(), 634 diag::err_param_default_argument_missing_name) 635 << Param->getIdentifier(); 636 else 637 Diag(Param->getLocation(), 638 diag::err_param_default_argument_missing); 639 640 LastMissingDefaultArg = p; 641 } 642 } 643 644 if (LastMissingDefaultArg > 0) { 645 // Some default arguments were missing. Clear out all of the 646 // default arguments up to (and including) the last missing 647 // default argument, so that we leave the function parameters 648 // in a semantically valid state. 649 for (p = 0; p <= LastMissingDefaultArg; ++p) { 650 ParmVarDecl *Param = FD->getParamDecl(p); 651 if (Param->hasDefaultArg()) { 652 Param->setDefaultArg(0); 653 } 654 } 655 } 656} 657 658// CheckConstexprParameterTypes - Check whether a function's parameter types 659// are all literal types. If so, return true. If not, produce a suitable 660// diagnostic and return false. 661static bool CheckConstexprParameterTypes(Sema &SemaRef, 662 const FunctionDecl *FD) { 663 unsigned ArgIndex = 0; 664 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 665 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 666 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 667 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 668 SourceLocation ParamLoc = PD->getLocation(); 669 if (!(*i)->isDependentType() && 670 SemaRef.RequireLiteralType(ParamLoc, *i, 671 diag::err_constexpr_non_literal_param, 672 ArgIndex+1, PD->getSourceRange(), 673 isa<CXXConstructorDecl>(FD))) 674 return false; 675 } 676 return true; 677} 678 679// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 680// the requirements of a constexpr function definition or a constexpr 681// constructor definition. If so, return true. If not, produce appropriate 682// diagnostics and return false. 683// 684// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 685bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 686 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 687 if (MD && MD->isInstance()) { 688 // C++11 [dcl.constexpr]p4: 689 // The definition of a constexpr constructor shall satisfy the following 690 // constraints: 691 // - the class shall not have any virtual base classes; 692 const CXXRecordDecl *RD = MD->getParent(); 693 if (RD->getNumVBases()) { 694 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 695 << isa<CXXConstructorDecl>(NewFD) << RD->isStruct() 696 << RD->getNumVBases(); 697 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 698 E = RD->vbases_end(); I != E; ++I) 699 Diag(I->getLocStart(), 700 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 701 return false; 702 } 703 } 704 705 if (!isa<CXXConstructorDecl>(NewFD)) { 706 // C++11 [dcl.constexpr]p3: 707 // The definition of a constexpr function shall satisfy the following 708 // constraints: 709 // - it shall not be virtual; 710 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 711 if (Method && Method->isVirtual()) { 712 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 713 714 // If it's not obvious why this function is virtual, find an overridden 715 // function which uses the 'virtual' keyword. 716 const CXXMethodDecl *WrittenVirtual = Method; 717 while (!WrittenVirtual->isVirtualAsWritten()) 718 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 719 if (WrittenVirtual != Method) 720 Diag(WrittenVirtual->getLocation(), 721 diag::note_overridden_virtual_function); 722 return false; 723 } 724 725 // - its return type shall be a literal type; 726 QualType RT = NewFD->getResultType(); 727 if (!RT->isDependentType() && 728 RequireLiteralType(NewFD->getLocation(), RT, 729 diag::err_constexpr_non_literal_return)) 730 return false; 731 } 732 733 // - each of its parameter types shall be a literal type; 734 if (!CheckConstexprParameterTypes(*this, NewFD)) 735 return false; 736 737 return true; 738} 739 740/// Check the given declaration statement is legal within a constexpr function 741/// body. C++0x [dcl.constexpr]p3,p4. 742/// 743/// \return true if the body is OK, false if we have diagnosed a problem. 744static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 745 DeclStmt *DS) { 746 // C++0x [dcl.constexpr]p3 and p4: 747 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 748 // contain only 749 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 750 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 751 switch ((*DclIt)->getKind()) { 752 case Decl::StaticAssert: 753 case Decl::Using: 754 case Decl::UsingShadow: 755 case Decl::UsingDirective: 756 case Decl::UnresolvedUsingTypename: 757 // - static_assert-declarations 758 // - using-declarations, 759 // - using-directives, 760 continue; 761 762 case Decl::Typedef: 763 case Decl::TypeAlias: { 764 // - typedef declarations and alias-declarations that do not define 765 // classes or enumerations, 766 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 767 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 768 // Don't allow variably-modified types in constexpr functions. 769 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 770 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 771 << TL.getSourceRange() << TL.getType() 772 << isa<CXXConstructorDecl>(Dcl); 773 return false; 774 } 775 continue; 776 } 777 778 case Decl::Enum: 779 case Decl::CXXRecord: 780 // As an extension, we allow the declaration (but not the definition) of 781 // classes and enumerations in all declarations, not just in typedef and 782 // alias declarations. 783 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 784 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 785 << isa<CXXConstructorDecl>(Dcl); 786 return false; 787 } 788 continue; 789 790 case Decl::Var: 791 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 792 << isa<CXXConstructorDecl>(Dcl); 793 return false; 794 795 default: 796 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 797 << isa<CXXConstructorDecl>(Dcl); 798 return false; 799 } 800 } 801 802 return true; 803} 804 805/// Check that the given field is initialized within a constexpr constructor. 806/// 807/// \param Dcl The constexpr constructor being checked. 808/// \param Field The field being checked. This may be a member of an anonymous 809/// struct or union nested within the class being checked. 810/// \param Inits All declarations, including anonymous struct/union members and 811/// indirect members, for which any initialization was provided. 812/// \param Diagnosed Set to true if an error is produced. 813static void CheckConstexprCtorInitializer(Sema &SemaRef, 814 const FunctionDecl *Dcl, 815 FieldDecl *Field, 816 llvm::SmallSet<Decl*, 16> &Inits, 817 bool &Diagnosed) { 818 if (Field->isUnnamedBitfield()) 819 return; 820 821 if (Field->isAnonymousStructOrUnion() && 822 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 823 return; 824 825 if (!Inits.count(Field)) { 826 if (!Diagnosed) { 827 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 828 Diagnosed = true; 829 } 830 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 831 } else if (Field->isAnonymousStructOrUnion()) { 832 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 833 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 834 I != E; ++I) 835 // If an anonymous union contains an anonymous struct of which any member 836 // is initialized, all members must be initialized. 837 if (!RD->isUnion() || Inits.count(*I)) 838 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 839 } 840} 841 842/// Check the body for the given constexpr function declaration only contains 843/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 844/// 845/// \return true if the body is OK, false if we have diagnosed a problem. 846bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 847 if (isa<CXXTryStmt>(Body)) { 848 // C++11 [dcl.constexpr]p3: 849 // The definition of a constexpr function shall satisfy the following 850 // constraints: [...] 851 // - its function-body shall be = delete, = default, or a 852 // compound-statement 853 // 854 // C++11 [dcl.constexpr]p4: 855 // In the definition of a constexpr constructor, [...] 856 // - its function-body shall not be a function-try-block; 857 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 858 << isa<CXXConstructorDecl>(Dcl); 859 return false; 860 } 861 862 // - its function-body shall be [...] a compound-statement that contains only 863 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 864 865 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 866 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 867 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 868 switch ((*BodyIt)->getStmtClass()) { 869 case Stmt::NullStmtClass: 870 // - null statements, 871 continue; 872 873 case Stmt::DeclStmtClass: 874 // - static_assert-declarations 875 // - using-declarations, 876 // - using-directives, 877 // - typedef declarations and alias-declarations that do not define 878 // classes or enumerations, 879 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 880 return false; 881 continue; 882 883 case Stmt::ReturnStmtClass: 884 // - and exactly one return statement; 885 if (isa<CXXConstructorDecl>(Dcl)) 886 break; 887 888 ReturnStmts.push_back((*BodyIt)->getLocStart()); 889 continue; 890 891 default: 892 break; 893 } 894 895 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 896 << isa<CXXConstructorDecl>(Dcl); 897 return false; 898 } 899 900 if (const CXXConstructorDecl *Constructor 901 = dyn_cast<CXXConstructorDecl>(Dcl)) { 902 const CXXRecordDecl *RD = Constructor->getParent(); 903 // DR1359: 904 // - every non-variant non-static data member and base class sub-object 905 // shall be initialized; 906 // - if the class is a non-empty union, or for each non-empty anonymous 907 // union member of a non-union class, exactly one non-static data member 908 // shall be initialized; 909 if (RD->isUnion()) { 910 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 911 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 912 return false; 913 } 914 } else if (!Constructor->isDependentContext() && 915 !Constructor->isDelegatingConstructor()) { 916 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 917 918 // Skip detailed checking if we have enough initializers, and we would 919 // allow at most one initializer per member. 920 bool AnyAnonStructUnionMembers = false; 921 unsigned Fields = 0; 922 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 923 E = RD->field_end(); I != E; ++I, ++Fields) { 924 if (I->isAnonymousStructOrUnion()) { 925 AnyAnonStructUnionMembers = true; 926 break; 927 } 928 } 929 if (AnyAnonStructUnionMembers || 930 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 931 // Check initialization of non-static data members. Base classes are 932 // always initialized so do not need to be checked. Dependent bases 933 // might not have initializers in the member initializer list. 934 llvm::SmallSet<Decl*, 16> Inits; 935 for (CXXConstructorDecl::init_const_iterator 936 I = Constructor->init_begin(), E = Constructor->init_end(); 937 I != E; ++I) { 938 if (FieldDecl *FD = (*I)->getMember()) 939 Inits.insert(FD); 940 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 941 Inits.insert(ID->chain_begin(), ID->chain_end()); 942 } 943 944 bool Diagnosed = false; 945 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 946 E = RD->field_end(); I != E; ++I) 947 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 948 if (Diagnosed) 949 return false; 950 } 951 } 952 } else { 953 if (ReturnStmts.empty()) { 954 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 955 return false; 956 } 957 if (ReturnStmts.size() > 1) { 958 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 959 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 960 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 961 return false; 962 } 963 } 964 965 // C++11 [dcl.constexpr]p5: 966 // if no function argument values exist such that the function invocation 967 // substitution would produce a constant expression, the program is 968 // ill-formed; no diagnostic required. 969 // C++11 [dcl.constexpr]p3: 970 // - every constructor call and implicit conversion used in initializing the 971 // return value shall be one of those allowed in a constant expression. 972 // C++11 [dcl.constexpr]p4: 973 // - every constructor involved in initializing non-static data members and 974 // base class sub-objects shall be a constexpr constructor. 975 llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 976 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 977 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr) 978 << isa<CXXConstructorDecl>(Dcl); 979 for (size_t I = 0, N = Diags.size(); I != N; ++I) 980 Diag(Diags[I].first, Diags[I].second); 981 return false; 982 } 983 984 return true; 985} 986 987/// isCurrentClassName - Determine whether the identifier II is the 988/// name of the class type currently being defined. In the case of 989/// nested classes, this will only return true if II is the name of 990/// the innermost class. 991bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 992 const CXXScopeSpec *SS) { 993 assert(getLangOpts().CPlusPlus && "No class names in C!"); 994 995 CXXRecordDecl *CurDecl; 996 if (SS && SS->isSet() && !SS->isInvalid()) { 997 DeclContext *DC = computeDeclContext(*SS, true); 998 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 999 } else 1000 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1001 1002 if (CurDecl && CurDecl->getIdentifier()) 1003 return &II == CurDecl->getIdentifier(); 1004 else 1005 return false; 1006} 1007 1008/// \brief Check the validity of a C++ base class specifier. 1009/// 1010/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1011/// and returns NULL otherwise. 1012CXXBaseSpecifier * 1013Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1014 SourceRange SpecifierRange, 1015 bool Virtual, AccessSpecifier Access, 1016 TypeSourceInfo *TInfo, 1017 SourceLocation EllipsisLoc) { 1018 QualType BaseType = TInfo->getType(); 1019 1020 // C++ [class.union]p1: 1021 // A union shall not have base classes. 1022 if (Class->isUnion()) { 1023 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1024 << SpecifierRange; 1025 return 0; 1026 } 1027 1028 if (EllipsisLoc.isValid() && 1029 !TInfo->getType()->containsUnexpandedParameterPack()) { 1030 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1031 << TInfo->getTypeLoc().getSourceRange(); 1032 EllipsisLoc = SourceLocation(); 1033 } 1034 1035 if (BaseType->isDependentType()) 1036 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1037 Class->getTagKind() == TTK_Class, 1038 Access, TInfo, EllipsisLoc); 1039 1040 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1041 1042 // Base specifiers must be record types. 1043 if (!BaseType->isRecordType()) { 1044 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1045 return 0; 1046 } 1047 1048 // C++ [class.union]p1: 1049 // A union shall not be used as a base class. 1050 if (BaseType->isUnionType()) { 1051 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1052 return 0; 1053 } 1054 1055 // C++ [class.derived]p2: 1056 // The class-name in a base-specifier shall not be an incompletely 1057 // defined class. 1058 if (RequireCompleteType(BaseLoc, BaseType, 1059 diag::err_incomplete_base_class, SpecifierRange)) { 1060 Class->setInvalidDecl(); 1061 return 0; 1062 } 1063 1064 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1065 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1066 assert(BaseDecl && "Record type has no declaration"); 1067 BaseDecl = BaseDecl->getDefinition(); 1068 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1069 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1070 assert(CXXBaseDecl && "Base type is not a C++ type"); 1071 1072 // C++ [class]p3: 1073 // If a class is marked final and it appears as a base-type-specifier in 1074 // base-clause, the program is ill-formed. 1075 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1076 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1077 << CXXBaseDecl->getDeclName(); 1078 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1079 << CXXBaseDecl->getDeclName(); 1080 return 0; 1081 } 1082 1083 if (BaseDecl->isInvalidDecl()) 1084 Class->setInvalidDecl(); 1085 1086 // Create the base specifier. 1087 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1088 Class->getTagKind() == TTK_Class, 1089 Access, TInfo, EllipsisLoc); 1090} 1091 1092/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1093/// one entry in the base class list of a class specifier, for 1094/// example: 1095/// class foo : public bar, virtual private baz { 1096/// 'public bar' and 'virtual private baz' are each base-specifiers. 1097BaseResult 1098Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1099 bool Virtual, AccessSpecifier Access, 1100 ParsedType basetype, SourceLocation BaseLoc, 1101 SourceLocation EllipsisLoc) { 1102 if (!classdecl) 1103 return true; 1104 1105 AdjustDeclIfTemplate(classdecl); 1106 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1107 if (!Class) 1108 return true; 1109 1110 TypeSourceInfo *TInfo = 0; 1111 GetTypeFromParser(basetype, &TInfo); 1112 1113 if (EllipsisLoc.isInvalid() && 1114 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1115 UPPC_BaseType)) 1116 return true; 1117 1118 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1119 Virtual, Access, TInfo, 1120 EllipsisLoc)) 1121 return BaseSpec; 1122 else 1123 Class->setInvalidDecl(); 1124 1125 return true; 1126} 1127 1128/// \brief Performs the actual work of attaching the given base class 1129/// specifiers to a C++ class. 1130bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1131 unsigned NumBases) { 1132 if (NumBases == 0) 1133 return false; 1134 1135 // Used to keep track of which base types we have already seen, so 1136 // that we can properly diagnose redundant direct base types. Note 1137 // that the key is always the unqualified canonical type of the base 1138 // class. 1139 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1140 1141 // Copy non-redundant base specifiers into permanent storage. 1142 unsigned NumGoodBases = 0; 1143 bool Invalid = false; 1144 for (unsigned idx = 0; idx < NumBases; ++idx) { 1145 QualType NewBaseType 1146 = Context.getCanonicalType(Bases[idx]->getType()); 1147 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1148 1149 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1150 if (KnownBase) { 1151 // C++ [class.mi]p3: 1152 // A class shall not be specified as a direct base class of a 1153 // derived class more than once. 1154 Diag(Bases[idx]->getLocStart(), 1155 diag::err_duplicate_base_class) 1156 << KnownBase->getType() 1157 << Bases[idx]->getSourceRange(); 1158 1159 // Delete the duplicate base class specifier; we're going to 1160 // overwrite its pointer later. 1161 Context.Deallocate(Bases[idx]); 1162 1163 Invalid = true; 1164 } else { 1165 // Okay, add this new base class. 1166 KnownBase = Bases[idx]; 1167 Bases[NumGoodBases++] = Bases[idx]; 1168 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1169 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1170 if (RD->hasAttr<WeakAttr>()) 1171 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1172 } 1173 } 1174 1175 // Attach the remaining base class specifiers to the derived class. 1176 Class->setBases(Bases, NumGoodBases); 1177 1178 // Delete the remaining (good) base class specifiers, since their 1179 // data has been copied into the CXXRecordDecl. 1180 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1181 Context.Deallocate(Bases[idx]); 1182 1183 return Invalid; 1184} 1185 1186/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1187/// class, after checking whether there are any duplicate base 1188/// classes. 1189void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1190 unsigned NumBases) { 1191 if (!ClassDecl || !Bases || !NumBases) 1192 return; 1193 1194 AdjustDeclIfTemplate(ClassDecl); 1195 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1196 (CXXBaseSpecifier**)(Bases), NumBases); 1197} 1198 1199static CXXRecordDecl *GetClassForType(QualType T) { 1200 if (const RecordType *RT = T->getAs<RecordType>()) 1201 return cast<CXXRecordDecl>(RT->getDecl()); 1202 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1203 return ICT->getDecl(); 1204 else 1205 return 0; 1206} 1207 1208/// \brief Determine whether the type \p Derived is a C++ class that is 1209/// derived from the type \p Base. 1210bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1211 if (!getLangOpts().CPlusPlus) 1212 return false; 1213 1214 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1215 if (!DerivedRD) 1216 return false; 1217 1218 CXXRecordDecl *BaseRD = GetClassForType(Base); 1219 if (!BaseRD) 1220 return false; 1221 1222 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1223 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1224} 1225 1226/// \brief Determine whether the type \p Derived is a C++ class that is 1227/// derived from the type \p Base. 1228bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1229 if (!getLangOpts().CPlusPlus) 1230 return false; 1231 1232 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1233 if (!DerivedRD) 1234 return false; 1235 1236 CXXRecordDecl *BaseRD = GetClassForType(Base); 1237 if (!BaseRD) 1238 return false; 1239 1240 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1241} 1242 1243void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1244 CXXCastPath &BasePathArray) { 1245 assert(BasePathArray.empty() && "Base path array must be empty!"); 1246 assert(Paths.isRecordingPaths() && "Must record paths!"); 1247 1248 const CXXBasePath &Path = Paths.front(); 1249 1250 // We first go backward and check if we have a virtual base. 1251 // FIXME: It would be better if CXXBasePath had the base specifier for 1252 // the nearest virtual base. 1253 unsigned Start = 0; 1254 for (unsigned I = Path.size(); I != 0; --I) { 1255 if (Path[I - 1].Base->isVirtual()) { 1256 Start = I - 1; 1257 break; 1258 } 1259 } 1260 1261 // Now add all bases. 1262 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1263 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1264} 1265 1266/// \brief Determine whether the given base path includes a virtual 1267/// base class. 1268bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1269 for (CXXCastPath::const_iterator B = BasePath.begin(), 1270 BEnd = BasePath.end(); 1271 B != BEnd; ++B) 1272 if ((*B)->isVirtual()) 1273 return true; 1274 1275 return false; 1276} 1277 1278/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1279/// conversion (where Derived and Base are class types) is 1280/// well-formed, meaning that the conversion is unambiguous (and 1281/// that all of the base classes are accessible). Returns true 1282/// and emits a diagnostic if the code is ill-formed, returns false 1283/// otherwise. Loc is the location where this routine should point to 1284/// if there is an error, and Range is the source range to highlight 1285/// if there is an error. 1286bool 1287Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1288 unsigned InaccessibleBaseID, 1289 unsigned AmbigiousBaseConvID, 1290 SourceLocation Loc, SourceRange Range, 1291 DeclarationName Name, 1292 CXXCastPath *BasePath) { 1293 // First, determine whether the path from Derived to Base is 1294 // ambiguous. This is slightly more expensive than checking whether 1295 // the Derived to Base conversion exists, because here we need to 1296 // explore multiple paths to determine if there is an ambiguity. 1297 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1298 /*DetectVirtual=*/false); 1299 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1300 assert(DerivationOkay && 1301 "Can only be used with a derived-to-base conversion"); 1302 (void)DerivationOkay; 1303 1304 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1305 if (InaccessibleBaseID) { 1306 // Check that the base class can be accessed. 1307 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1308 InaccessibleBaseID)) { 1309 case AR_inaccessible: 1310 return true; 1311 case AR_accessible: 1312 case AR_dependent: 1313 case AR_delayed: 1314 break; 1315 } 1316 } 1317 1318 // Build a base path if necessary. 1319 if (BasePath) 1320 BuildBasePathArray(Paths, *BasePath); 1321 return false; 1322 } 1323 1324 // We know that the derived-to-base conversion is ambiguous, and 1325 // we're going to produce a diagnostic. Perform the derived-to-base 1326 // search just one more time to compute all of the possible paths so 1327 // that we can print them out. This is more expensive than any of 1328 // the previous derived-to-base checks we've done, but at this point 1329 // performance isn't as much of an issue. 1330 Paths.clear(); 1331 Paths.setRecordingPaths(true); 1332 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1333 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1334 (void)StillOkay; 1335 1336 // Build up a textual representation of the ambiguous paths, e.g., 1337 // D -> B -> A, that will be used to illustrate the ambiguous 1338 // conversions in the diagnostic. We only print one of the paths 1339 // to each base class subobject. 1340 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1341 1342 Diag(Loc, AmbigiousBaseConvID) 1343 << Derived << Base << PathDisplayStr << Range << Name; 1344 return true; 1345} 1346 1347bool 1348Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1349 SourceLocation Loc, SourceRange Range, 1350 CXXCastPath *BasePath, 1351 bool IgnoreAccess) { 1352 return CheckDerivedToBaseConversion(Derived, Base, 1353 IgnoreAccess ? 0 1354 : diag::err_upcast_to_inaccessible_base, 1355 diag::err_ambiguous_derived_to_base_conv, 1356 Loc, Range, DeclarationName(), 1357 BasePath); 1358} 1359 1360 1361/// @brief Builds a string representing ambiguous paths from a 1362/// specific derived class to different subobjects of the same base 1363/// class. 1364/// 1365/// This function builds a string that can be used in error messages 1366/// to show the different paths that one can take through the 1367/// inheritance hierarchy to go from the derived class to different 1368/// subobjects of a base class. The result looks something like this: 1369/// @code 1370/// struct D -> struct B -> struct A 1371/// struct D -> struct C -> struct A 1372/// @endcode 1373std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1374 std::string PathDisplayStr; 1375 std::set<unsigned> DisplayedPaths; 1376 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1377 Path != Paths.end(); ++Path) { 1378 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1379 // We haven't displayed a path to this particular base 1380 // class subobject yet. 1381 PathDisplayStr += "\n "; 1382 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1383 for (CXXBasePath::const_iterator Element = Path->begin(); 1384 Element != Path->end(); ++Element) 1385 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1386 } 1387 } 1388 1389 return PathDisplayStr; 1390} 1391 1392//===----------------------------------------------------------------------===// 1393// C++ class member Handling 1394//===----------------------------------------------------------------------===// 1395 1396/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1397bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1398 SourceLocation ASLoc, 1399 SourceLocation ColonLoc, 1400 AttributeList *Attrs) { 1401 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1402 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1403 ASLoc, ColonLoc); 1404 CurContext->addHiddenDecl(ASDecl); 1405 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1406} 1407 1408/// CheckOverrideControl - Check C++0x override control semantics. 1409void Sema::CheckOverrideControl(const Decl *D) { 1410 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1411 if (!MD || !MD->isVirtual()) 1412 return; 1413 1414 if (MD->isDependentContext()) 1415 return; 1416 1417 // C++0x [class.virtual]p3: 1418 // If a virtual function is marked with the virt-specifier override and does 1419 // not override a member function of a base class, 1420 // the program is ill-formed. 1421 bool HasOverriddenMethods = 1422 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1423 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1424 Diag(MD->getLocation(), 1425 diag::err_function_marked_override_not_overriding) 1426 << MD->getDeclName(); 1427 return; 1428 } 1429} 1430 1431/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1432/// function overrides a virtual member function marked 'final', according to 1433/// C++0x [class.virtual]p3. 1434bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1435 const CXXMethodDecl *Old) { 1436 if (!Old->hasAttr<FinalAttr>()) 1437 return false; 1438 1439 Diag(New->getLocation(), diag::err_final_function_overridden) 1440 << New->getDeclName(); 1441 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1442 return true; 1443} 1444 1445static bool InitializationHasSideEffects(const FieldDecl &FD) { 1446 if (!FD.getType().isNull()) { 1447 if (const CXXRecordDecl *RD = FD.getType()->getAsCXXRecordDecl()) { 1448 return !RD->isCompleteDefinition() || 1449 !RD->hasTrivialDefaultConstructor() || 1450 !RD->hasTrivialDestructor(); 1451 } 1452 } 1453 return false; 1454} 1455 1456/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1457/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1458/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1459/// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1460/// present (but parsing it has been deferred). 1461Decl * 1462Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1463 MultiTemplateParamsArg TemplateParameterLists, 1464 Expr *BW, const VirtSpecifiers &VS, 1465 InClassInitStyle InitStyle) { 1466 const DeclSpec &DS = D.getDeclSpec(); 1467 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1468 DeclarationName Name = NameInfo.getName(); 1469 SourceLocation Loc = NameInfo.getLoc(); 1470 1471 // For anonymous bitfields, the location should point to the type. 1472 if (Loc.isInvalid()) 1473 Loc = D.getLocStart(); 1474 1475 Expr *BitWidth = static_cast<Expr*>(BW); 1476 1477 assert(isa<CXXRecordDecl>(CurContext)); 1478 assert(!DS.isFriendSpecified()); 1479 1480 bool isFunc = D.isDeclarationOfFunction(); 1481 1482 // C++ 9.2p6: A member shall not be declared to have automatic storage 1483 // duration (auto, register) or with the extern storage-class-specifier. 1484 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1485 // data members and cannot be applied to names declared const or static, 1486 // and cannot be applied to reference members. 1487 switch (DS.getStorageClassSpec()) { 1488 case DeclSpec::SCS_unspecified: 1489 case DeclSpec::SCS_typedef: 1490 case DeclSpec::SCS_static: 1491 // FALL THROUGH. 1492 break; 1493 case DeclSpec::SCS_mutable: 1494 if (isFunc) { 1495 if (DS.getStorageClassSpecLoc().isValid()) 1496 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1497 else 1498 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1499 1500 // FIXME: It would be nicer if the keyword was ignored only for this 1501 // declarator. Otherwise we could get follow-up errors. 1502 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1503 } 1504 break; 1505 default: 1506 if (DS.getStorageClassSpecLoc().isValid()) 1507 Diag(DS.getStorageClassSpecLoc(), 1508 diag::err_storageclass_invalid_for_member); 1509 else 1510 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1511 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1512 } 1513 1514 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1515 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1516 !isFunc); 1517 1518 Decl *Member; 1519 if (isInstField) { 1520 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1521 1522 // Data members must have identifiers for names. 1523 if (!Name.isIdentifier()) { 1524 Diag(Loc, diag::err_bad_variable_name) 1525 << Name; 1526 return 0; 1527 } 1528 1529 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1530 1531 // Member field could not be with "template" keyword. 1532 // So TemplateParameterLists should be empty in this case. 1533 if (TemplateParameterLists.size()) { 1534 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1535 if (TemplateParams->size()) { 1536 // There is no such thing as a member field template. 1537 Diag(D.getIdentifierLoc(), diag::err_template_member) 1538 << II 1539 << SourceRange(TemplateParams->getTemplateLoc(), 1540 TemplateParams->getRAngleLoc()); 1541 } else { 1542 // There is an extraneous 'template<>' for this member. 1543 Diag(TemplateParams->getTemplateLoc(), 1544 diag::err_template_member_noparams) 1545 << II 1546 << SourceRange(TemplateParams->getTemplateLoc(), 1547 TemplateParams->getRAngleLoc()); 1548 } 1549 return 0; 1550 } 1551 1552 if (SS.isSet() && !SS.isInvalid()) { 1553 // The user provided a superfluous scope specifier inside a class 1554 // definition: 1555 // 1556 // class X { 1557 // int X::member; 1558 // }; 1559 if (DeclContext *DC = computeDeclContext(SS, false)) 1560 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1561 else 1562 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1563 << Name << SS.getRange(); 1564 1565 SS.clear(); 1566 } 1567 1568 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1569 InitStyle, AS); 1570 assert(Member && "HandleField never returns null"); 1571 } else { 1572 assert(InitStyle == ICIS_NoInit); 1573 1574 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1575 if (!Member) { 1576 return 0; 1577 } 1578 1579 // Non-instance-fields can't have a bitfield. 1580 if (BitWidth) { 1581 if (Member->isInvalidDecl()) { 1582 // don't emit another diagnostic. 1583 } else if (isa<VarDecl>(Member)) { 1584 // C++ 9.6p3: A bit-field shall not be a static member. 1585 // "static member 'A' cannot be a bit-field" 1586 Diag(Loc, diag::err_static_not_bitfield) 1587 << Name << BitWidth->getSourceRange(); 1588 } else if (isa<TypedefDecl>(Member)) { 1589 // "typedef member 'x' cannot be a bit-field" 1590 Diag(Loc, diag::err_typedef_not_bitfield) 1591 << Name << BitWidth->getSourceRange(); 1592 } else { 1593 // A function typedef ("typedef int f(); f a;"). 1594 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1595 Diag(Loc, diag::err_not_integral_type_bitfield) 1596 << Name << cast<ValueDecl>(Member)->getType() 1597 << BitWidth->getSourceRange(); 1598 } 1599 1600 BitWidth = 0; 1601 Member->setInvalidDecl(); 1602 } 1603 1604 Member->setAccess(AS); 1605 1606 // If we have declared a member function template, set the access of the 1607 // templated declaration as well. 1608 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1609 FunTmpl->getTemplatedDecl()->setAccess(AS); 1610 } 1611 1612 if (VS.isOverrideSpecified()) { 1613 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1614 if (!MD || !MD->isVirtual()) { 1615 Diag(Member->getLocStart(), 1616 diag::override_keyword_only_allowed_on_virtual_member_functions) 1617 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1618 } else 1619 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1620 } 1621 if (VS.isFinalSpecified()) { 1622 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1623 if (!MD || !MD->isVirtual()) { 1624 Diag(Member->getLocStart(), 1625 diag::override_keyword_only_allowed_on_virtual_member_functions) 1626 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1627 } else 1628 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1629 } 1630 1631 if (VS.getLastLocation().isValid()) { 1632 // Update the end location of a method that has a virt-specifiers. 1633 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1634 MD->setRangeEnd(VS.getLastLocation()); 1635 } 1636 1637 CheckOverrideControl(Member); 1638 1639 assert((Name || isInstField) && "No identifier for non-field ?"); 1640 1641 if (isInstField) { 1642 FieldDecl *FD = cast<FieldDecl>(Member); 1643 FieldCollector->Add(FD); 1644 1645 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 1646 FD->getLocation()) 1647 != DiagnosticsEngine::Ignored) { 1648 // Remember all explicit private FieldDecls that have a name, no side 1649 // effects and are not part of a dependent type declaration. 1650 if (!FD->isImplicit() && FD->getDeclName() && 1651 FD->getAccess() == AS_private && 1652 !FD->hasAttr<UnusedAttr>() && 1653 !FD->getParent()->getTypeForDecl()->isDependentType() && 1654 !InitializationHasSideEffects(*FD)) 1655 UnusedPrivateFields.insert(FD); 1656 } 1657 } 1658 1659 return Member; 1660} 1661 1662/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1663/// in-class initializer for a non-static C++ class member, and after 1664/// instantiating an in-class initializer in a class template. Such actions 1665/// are deferred until the class is complete. 1666void 1667Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 1668 Expr *InitExpr) { 1669 FieldDecl *FD = cast<FieldDecl>(D); 1670 assert(FD->getInClassInitStyle() != ICIS_NoInit && 1671 "must set init style when field is created"); 1672 1673 if (!InitExpr) { 1674 FD->setInvalidDecl(); 1675 FD->removeInClassInitializer(); 1676 return; 1677 } 1678 1679 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1680 FD->setInvalidDecl(); 1681 FD->removeInClassInitializer(); 1682 return; 1683 } 1684 1685 ExprResult Init = InitExpr; 1686 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1687 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1688 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1689 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1690 } 1691 Expr **Inits = &InitExpr; 1692 unsigned NumInits = 1; 1693 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1694 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 1695 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1696 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 1697 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 1698 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 1699 if (Init.isInvalid()) { 1700 FD->setInvalidDecl(); 1701 return; 1702 } 1703 1704 CheckImplicitConversions(Init.get(), InitLoc); 1705 } 1706 1707 // C++0x [class.base.init]p7: 1708 // The initialization of each base and member constitutes a 1709 // full-expression. 1710 Init = MaybeCreateExprWithCleanups(Init); 1711 if (Init.isInvalid()) { 1712 FD->setInvalidDecl(); 1713 return; 1714 } 1715 1716 InitExpr = Init.release(); 1717 1718 FD->setInClassInitializer(InitExpr); 1719} 1720 1721/// \brief Find the direct and/or virtual base specifiers that 1722/// correspond to the given base type, for use in base initialization 1723/// within a constructor. 1724static bool FindBaseInitializer(Sema &SemaRef, 1725 CXXRecordDecl *ClassDecl, 1726 QualType BaseType, 1727 const CXXBaseSpecifier *&DirectBaseSpec, 1728 const CXXBaseSpecifier *&VirtualBaseSpec) { 1729 // First, check for a direct base class. 1730 DirectBaseSpec = 0; 1731 for (CXXRecordDecl::base_class_const_iterator Base 1732 = ClassDecl->bases_begin(); 1733 Base != ClassDecl->bases_end(); ++Base) { 1734 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1735 // We found a direct base of this type. That's what we're 1736 // initializing. 1737 DirectBaseSpec = &*Base; 1738 break; 1739 } 1740 } 1741 1742 // Check for a virtual base class. 1743 // FIXME: We might be able to short-circuit this if we know in advance that 1744 // there are no virtual bases. 1745 VirtualBaseSpec = 0; 1746 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1747 // We haven't found a base yet; search the class hierarchy for a 1748 // virtual base class. 1749 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1750 /*DetectVirtual=*/false); 1751 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1752 BaseType, Paths)) { 1753 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1754 Path != Paths.end(); ++Path) { 1755 if (Path->back().Base->isVirtual()) { 1756 VirtualBaseSpec = Path->back().Base; 1757 break; 1758 } 1759 } 1760 } 1761 } 1762 1763 return DirectBaseSpec || VirtualBaseSpec; 1764} 1765 1766/// \brief Handle a C++ member initializer using braced-init-list syntax. 1767MemInitResult 1768Sema::ActOnMemInitializer(Decl *ConstructorD, 1769 Scope *S, 1770 CXXScopeSpec &SS, 1771 IdentifierInfo *MemberOrBase, 1772 ParsedType TemplateTypeTy, 1773 const DeclSpec &DS, 1774 SourceLocation IdLoc, 1775 Expr *InitList, 1776 SourceLocation EllipsisLoc) { 1777 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1778 DS, IdLoc, InitList, 1779 EllipsisLoc); 1780} 1781 1782/// \brief Handle a C++ member initializer using parentheses syntax. 1783MemInitResult 1784Sema::ActOnMemInitializer(Decl *ConstructorD, 1785 Scope *S, 1786 CXXScopeSpec &SS, 1787 IdentifierInfo *MemberOrBase, 1788 ParsedType TemplateTypeTy, 1789 const DeclSpec &DS, 1790 SourceLocation IdLoc, 1791 SourceLocation LParenLoc, 1792 Expr **Args, unsigned NumArgs, 1793 SourceLocation RParenLoc, 1794 SourceLocation EllipsisLoc) { 1795 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1796 RParenLoc); 1797 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1798 DS, IdLoc, List, EllipsisLoc); 1799} 1800 1801namespace { 1802 1803// Callback to only accept typo corrections that can be a valid C++ member 1804// intializer: either a non-static field member or a base class. 1805class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1806 public: 1807 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1808 : ClassDecl(ClassDecl) {} 1809 1810 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1811 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1812 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1813 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1814 else 1815 return isa<TypeDecl>(ND); 1816 } 1817 return false; 1818 } 1819 1820 private: 1821 CXXRecordDecl *ClassDecl; 1822}; 1823 1824} 1825 1826/// \brief Handle a C++ member initializer. 1827MemInitResult 1828Sema::BuildMemInitializer(Decl *ConstructorD, 1829 Scope *S, 1830 CXXScopeSpec &SS, 1831 IdentifierInfo *MemberOrBase, 1832 ParsedType TemplateTypeTy, 1833 const DeclSpec &DS, 1834 SourceLocation IdLoc, 1835 Expr *Init, 1836 SourceLocation EllipsisLoc) { 1837 if (!ConstructorD) 1838 return true; 1839 1840 AdjustDeclIfTemplate(ConstructorD); 1841 1842 CXXConstructorDecl *Constructor 1843 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1844 if (!Constructor) { 1845 // The user wrote a constructor initializer on a function that is 1846 // not a C++ constructor. Ignore the error for now, because we may 1847 // have more member initializers coming; we'll diagnose it just 1848 // once in ActOnMemInitializers. 1849 return true; 1850 } 1851 1852 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1853 1854 // C++ [class.base.init]p2: 1855 // Names in a mem-initializer-id are looked up in the scope of the 1856 // constructor's class and, if not found in that scope, are looked 1857 // up in the scope containing the constructor's definition. 1858 // [Note: if the constructor's class contains a member with the 1859 // same name as a direct or virtual base class of the class, a 1860 // mem-initializer-id naming the member or base class and composed 1861 // of a single identifier refers to the class member. A 1862 // mem-initializer-id for the hidden base class may be specified 1863 // using a qualified name. ] 1864 if (!SS.getScopeRep() && !TemplateTypeTy) { 1865 // Look for a member, first. 1866 DeclContext::lookup_result Result 1867 = ClassDecl->lookup(MemberOrBase); 1868 if (Result.first != Result.second) { 1869 ValueDecl *Member; 1870 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1871 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1872 if (EllipsisLoc.isValid()) 1873 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1874 << MemberOrBase 1875 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 1876 1877 return BuildMemberInitializer(Member, Init, IdLoc); 1878 } 1879 } 1880 } 1881 // It didn't name a member, so see if it names a class. 1882 QualType BaseType; 1883 TypeSourceInfo *TInfo = 0; 1884 1885 if (TemplateTypeTy) { 1886 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1887 } else if (DS.getTypeSpecType() == TST_decltype) { 1888 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 1889 } else { 1890 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1891 LookupParsedName(R, S, &SS); 1892 1893 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1894 if (!TyD) { 1895 if (R.isAmbiguous()) return true; 1896 1897 // We don't want access-control diagnostics here. 1898 R.suppressDiagnostics(); 1899 1900 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1901 bool NotUnknownSpecialization = false; 1902 DeclContext *DC = computeDeclContext(SS, false); 1903 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1904 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1905 1906 if (!NotUnknownSpecialization) { 1907 // When the scope specifier can refer to a member of an unknown 1908 // specialization, we take it as a type name. 1909 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1910 SS.getWithLocInContext(Context), 1911 *MemberOrBase, IdLoc); 1912 if (BaseType.isNull()) 1913 return true; 1914 1915 R.clear(); 1916 R.setLookupName(MemberOrBase); 1917 } 1918 } 1919 1920 // If no results were found, try to correct typos. 1921 TypoCorrection Corr; 1922 MemInitializerValidatorCCC Validator(ClassDecl); 1923 if (R.empty() && BaseType.isNull() && 1924 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1925 Validator, ClassDecl))) { 1926 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 1927 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 1928 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1929 // We have found a non-static data member with a similar 1930 // name to what was typed; complain and initialize that 1931 // member. 1932 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1933 << MemberOrBase << true << CorrectedQuotedStr 1934 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1935 Diag(Member->getLocation(), diag::note_previous_decl) 1936 << CorrectedQuotedStr; 1937 1938 return BuildMemberInitializer(Member, Init, IdLoc); 1939 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1940 const CXXBaseSpecifier *DirectBaseSpec; 1941 const CXXBaseSpecifier *VirtualBaseSpec; 1942 if (FindBaseInitializer(*this, ClassDecl, 1943 Context.getTypeDeclType(Type), 1944 DirectBaseSpec, VirtualBaseSpec)) { 1945 // We have found a direct or virtual base class with a 1946 // similar name to what was typed; complain and initialize 1947 // that base class. 1948 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1949 << MemberOrBase << false << CorrectedQuotedStr 1950 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1951 1952 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1953 : VirtualBaseSpec; 1954 Diag(BaseSpec->getLocStart(), 1955 diag::note_base_class_specified_here) 1956 << BaseSpec->getType() 1957 << BaseSpec->getSourceRange(); 1958 1959 TyD = Type; 1960 } 1961 } 1962 } 1963 1964 if (!TyD && BaseType.isNull()) { 1965 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1966 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 1967 return true; 1968 } 1969 } 1970 1971 if (BaseType.isNull()) { 1972 BaseType = Context.getTypeDeclType(TyD); 1973 if (SS.isSet()) { 1974 NestedNameSpecifier *Qualifier = 1975 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1976 1977 // FIXME: preserve source range information 1978 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1979 } 1980 } 1981 } 1982 1983 if (!TInfo) 1984 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1985 1986 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 1987} 1988 1989/// Checks a member initializer expression for cases where reference (or 1990/// pointer) members are bound to by-value parameters (or their addresses). 1991static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1992 Expr *Init, 1993 SourceLocation IdLoc) { 1994 QualType MemberTy = Member->getType(); 1995 1996 // We only handle pointers and references currently. 1997 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1998 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1999 return; 2000 2001 const bool IsPointer = MemberTy->isPointerType(); 2002 if (IsPointer) { 2003 if (const UnaryOperator *Op 2004 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2005 // The only case we're worried about with pointers requires taking the 2006 // address. 2007 if (Op->getOpcode() != UO_AddrOf) 2008 return; 2009 2010 Init = Op->getSubExpr(); 2011 } else { 2012 // We only handle address-of expression initializers for pointers. 2013 return; 2014 } 2015 } 2016 2017 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 2018 // Taking the address of a temporary will be diagnosed as a hard error. 2019 if (IsPointer) 2020 return; 2021 2022 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 2023 << Member << Init->getSourceRange(); 2024 } else if (const DeclRefExpr *DRE 2025 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2026 // We only warn when referring to a non-reference parameter declaration. 2027 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2028 if (!Parameter || Parameter->getType()->isReferenceType()) 2029 return; 2030 2031 S.Diag(Init->getExprLoc(), 2032 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2033 : diag::warn_bind_ref_member_to_parameter) 2034 << Member << Parameter << Init->getSourceRange(); 2035 } else { 2036 // Other initializers are fine. 2037 return; 2038 } 2039 2040 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2041 << (unsigned)IsPointer; 2042} 2043 2044namespace { 2045 class UninitializedFieldVisitor 2046 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 2047 Sema &S; 2048 ValueDecl *VD; 2049 public: 2050 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 2051 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context), 2052 S(S), VD(VD) { 2053 } 2054 2055 void HandleExpr(Expr *E) { 2056 if (!E) return; 2057 2058 // Expressions like x(x) sometimes lack the surrounding expressions 2059 // but need to be checked anyways. 2060 HandleValue(E); 2061 Visit(E); 2062 } 2063 2064 void HandleValue(Expr *E) { 2065 E = E->IgnoreParens(); 2066 2067 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 2068 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 2069 return; 2070 Expr *Base = E; 2071 while (isa<MemberExpr>(Base)) { 2072 ME = dyn_cast<MemberExpr>(Base); 2073 if (VarDecl *VarD = dyn_cast<VarDecl>(ME->getMemberDecl())) 2074 if (VarD->hasGlobalStorage()) 2075 return; 2076 Base = ME->getBase(); 2077 } 2078 2079 if (VD == ME->getMemberDecl() && isa<CXXThisExpr>(Base)) { 2080 S.Diag(ME->getExprLoc(), diag::warn_field_is_uninit); 2081 return; 2082 } 2083 } 2084 2085 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 2086 HandleValue(CO->getTrueExpr()); 2087 HandleValue(CO->getFalseExpr()); 2088 return; 2089 } 2090 2091 if (BinaryConditionalOperator *BCO = 2092 dyn_cast<BinaryConditionalOperator>(E)) { 2093 HandleValue(BCO->getCommon()); 2094 HandleValue(BCO->getFalseExpr()); 2095 return; 2096 } 2097 2098 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2099 switch (BO->getOpcode()) { 2100 default: 2101 return; 2102 case(BO_PtrMemD): 2103 case(BO_PtrMemI): 2104 HandleValue(BO->getLHS()); 2105 return; 2106 case(BO_Comma): 2107 HandleValue(BO->getRHS()); 2108 return; 2109 } 2110 } 2111 } 2112 2113 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 2114 if (E->getCastKind() == CK_LValueToRValue) 2115 HandleValue(E->getSubExpr()); 2116 2117 Inherited::VisitImplicitCastExpr(E); 2118 } 2119 2120 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 2121 Expr *Callee = E->getCallee(); 2122 if (isa<MemberExpr>(Callee)) 2123 HandleValue(Callee); 2124 2125 Inherited::VisitCXXMemberCallExpr(E); 2126 } 2127 }; 2128 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E, 2129 ValueDecl *VD) { 2130 UninitializedFieldVisitor(S, VD).HandleExpr(E); 2131 } 2132} // namespace 2133 2134MemInitResult 2135Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2136 SourceLocation IdLoc) { 2137 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2138 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2139 assert((DirectMember || IndirectMember) && 2140 "Member must be a FieldDecl or IndirectFieldDecl"); 2141 2142 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2143 return true; 2144 2145 if (Member->isInvalidDecl()) 2146 return true; 2147 2148 // Diagnose value-uses of fields to initialize themselves, e.g. 2149 // foo(foo) 2150 // where foo is not also a parameter to the constructor. 2151 // TODO: implement -Wuninitialized and fold this into that framework. 2152 Expr **Args; 2153 unsigned NumArgs; 2154 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2155 Args = ParenList->getExprs(); 2156 NumArgs = ParenList->getNumExprs(); 2157 } else { 2158 InitListExpr *InitList = cast<InitListExpr>(Init); 2159 Args = InitList->getInits(); 2160 NumArgs = InitList->getNumInits(); 2161 } 2162 2163 // Mark FieldDecl as being used if it is a non-primitive type and the 2164 // initializer does not call the default constructor (which is trivial 2165 // for all entries in UnusedPrivateFields). 2166 // FIXME: Make this smarter once more side effect-free types can be 2167 // determined. 2168 if (NumArgs > 0) { 2169 if (Member->getType()->isRecordType()) { 2170 UnusedPrivateFields.remove(Member); 2171 } else { 2172 for (unsigned i = 0; i < NumArgs; ++i) { 2173 if (Args[i]->HasSideEffects(Context)) { 2174 UnusedPrivateFields.remove(Member); 2175 break; 2176 } 2177 } 2178 } 2179 } 2180 2181 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc) 2182 != DiagnosticsEngine::Ignored) 2183 for (unsigned i = 0; i < NumArgs; ++i) 2184 // FIXME: Warn about the case when other fields are used before being 2185 // uninitialized. For example, let this field be the i'th field. When 2186 // initializing the i'th field, throw a warning if any of the >= i'th 2187 // fields are used, as they are not yet initialized. 2188 // Right now we are only handling the case where the i'th field uses 2189 // itself in its initializer. 2190 CheckInitExprContainsUninitializedFields(*this, Args[i], Member); 2191 2192 SourceRange InitRange = Init->getSourceRange(); 2193 2194 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2195 // Can't check initialization for a member of dependent type or when 2196 // any of the arguments are type-dependent expressions. 2197 DiscardCleanupsInEvaluationContext(); 2198 } else { 2199 bool InitList = false; 2200 if (isa<InitListExpr>(Init)) { 2201 InitList = true; 2202 Args = &Init; 2203 NumArgs = 1; 2204 2205 if (isStdInitializerList(Member->getType(), 0)) { 2206 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2207 << /*at end of ctor*/1 << InitRange; 2208 } 2209 } 2210 2211 // Initialize the member. 2212 InitializedEntity MemberEntity = 2213 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2214 : InitializedEntity::InitializeMember(IndirectMember, 0); 2215 InitializationKind Kind = 2216 InitList ? InitializationKind::CreateDirectList(IdLoc) 2217 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2218 InitRange.getEnd()); 2219 2220 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2221 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2222 MultiExprArg(*this, Args, NumArgs), 2223 0); 2224 if (MemberInit.isInvalid()) 2225 return true; 2226 2227 CheckImplicitConversions(MemberInit.get(), 2228 InitRange.getBegin()); 2229 2230 // C++0x [class.base.init]p7: 2231 // The initialization of each base and member constitutes a 2232 // full-expression. 2233 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2234 if (MemberInit.isInvalid()) 2235 return true; 2236 2237 // If we are in a dependent context, template instantiation will 2238 // perform this type-checking again. Just save the arguments that we 2239 // received. 2240 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2241 // of the information that we have about the member 2242 // initializer. However, deconstructing the ASTs is a dicey process, 2243 // and this approach is far more likely to get the corner cases right. 2244 if (CurContext->isDependentContext()) { 2245 // The existing Init will do fine. 2246 } else { 2247 Init = MemberInit.get(); 2248 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2249 } 2250 } 2251 2252 if (DirectMember) { 2253 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2254 InitRange.getBegin(), Init, 2255 InitRange.getEnd()); 2256 } else { 2257 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2258 InitRange.getBegin(), Init, 2259 InitRange.getEnd()); 2260 } 2261} 2262 2263MemInitResult 2264Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2265 CXXRecordDecl *ClassDecl) { 2266 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2267 if (!LangOpts.CPlusPlus0x) 2268 return Diag(NameLoc, diag::err_delegating_ctor) 2269 << TInfo->getTypeLoc().getLocalSourceRange(); 2270 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2271 2272 bool InitList = true; 2273 Expr **Args = &Init; 2274 unsigned NumArgs = 1; 2275 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2276 InitList = false; 2277 Args = ParenList->getExprs(); 2278 NumArgs = ParenList->getNumExprs(); 2279 } 2280 2281 SourceRange InitRange = Init->getSourceRange(); 2282 // Initialize the object. 2283 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2284 QualType(ClassDecl->getTypeForDecl(), 0)); 2285 InitializationKind Kind = 2286 InitList ? InitializationKind::CreateDirectList(NameLoc) 2287 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2288 InitRange.getEnd()); 2289 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2290 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2291 MultiExprArg(*this, Args,NumArgs), 2292 0); 2293 if (DelegationInit.isInvalid()) 2294 return true; 2295 2296 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2297 "Delegating constructor with no target?"); 2298 2299 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2300 2301 // C++0x [class.base.init]p7: 2302 // The initialization of each base and member constitutes a 2303 // full-expression. 2304 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2305 if (DelegationInit.isInvalid()) 2306 return true; 2307 2308 // If we are in a dependent context, template instantiation will 2309 // perform this type-checking again. Just save the arguments that we 2310 // received in a ParenListExpr. 2311 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2312 // of the information that we have about the base 2313 // initializer. However, deconstructing the ASTs is a dicey process, 2314 // and this approach is far more likely to get the corner cases right. 2315 if (CurContext->isDependentContext()) 2316 DelegationInit = Owned(Init); 2317 2318 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2319 DelegationInit.takeAs<Expr>(), 2320 InitRange.getEnd()); 2321} 2322 2323MemInitResult 2324Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2325 Expr *Init, CXXRecordDecl *ClassDecl, 2326 SourceLocation EllipsisLoc) { 2327 SourceLocation BaseLoc 2328 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2329 2330 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2331 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2332 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2333 2334 // C++ [class.base.init]p2: 2335 // [...] Unless the mem-initializer-id names a nonstatic data 2336 // member of the constructor's class or a direct or virtual base 2337 // of that class, the mem-initializer is ill-formed. A 2338 // mem-initializer-list can initialize a base class using any 2339 // name that denotes that base class type. 2340 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2341 2342 SourceRange InitRange = Init->getSourceRange(); 2343 if (EllipsisLoc.isValid()) { 2344 // This is a pack expansion. 2345 if (!BaseType->containsUnexpandedParameterPack()) { 2346 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2347 << SourceRange(BaseLoc, InitRange.getEnd()); 2348 2349 EllipsisLoc = SourceLocation(); 2350 } 2351 } else { 2352 // Check for any unexpanded parameter packs. 2353 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2354 return true; 2355 2356 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2357 return true; 2358 } 2359 2360 // Check for direct and virtual base classes. 2361 const CXXBaseSpecifier *DirectBaseSpec = 0; 2362 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2363 if (!Dependent) { 2364 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2365 BaseType)) 2366 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2367 2368 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2369 VirtualBaseSpec); 2370 2371 // C++ [base.class.init]p2: 2372 // Unless the mem-initializer-id names a nonstatic data member of the 2373 // constructor's class or a direct or virtual base of that class, the 2374 // mem-initializer is ill-formed. 2375 if (!DirectBaseSpec && !VirtualBaseSpec) { 2376 // If the class has any dependent bases, then it's possible that 2377 // one of those types will resolve to the same type as 2378 // BaseType. Therefore, just treat this as a dependent base 2379 // class initialization. FIXME: Should we try to check the 2380 // initialization anyway? It seems odd. 2381 if (ClassDecl->hasAnyDependentBases()) 2382 Dependent = true; 2383 else 2384 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2385 << BaseType << Context.getTypeDeclType(ClassDecl) 2386 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2387 } 2388 } 2389 2390 if (Dependent) { 2391 DiscardCleanupsInEvaluationContext(); 2392 2393 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2394 /*IsVirtual=*/false, 2395 InitRange.getBegin(), Init, 2396 InitRange.getEnd(), EllipsisLoc); 2397 } 2398 2399 // C++ [base.class.init]p2: 2400 // If a mem-initializer-id is ambiguous because it designates both 2401 // a direct non-virtual base class and an inherited virtual base 2402 // class, the mem-initializer is ill-formed. 2403 if (DirectBaseSpec && VirtualBaseSpec) 2404 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2405 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2406 2407 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2408 if (!BaseSpec) 2409 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2410 2411 // Initialize the base. 2412 bool InitList = true; 2413 Expr **Args = &Init; 2414 unsigned NumArgs = 1; 2415 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2416 InitList = false; 2417 Args = ParenList->getExprs(); 2418 NumArgs = ParenList->getNumExprs(); 2419 } 2420 2421 InitializedEntity BaseEntity = 2422 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2423 InitializationKind Kind = 2424 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2425 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2426 InitRange.getEnd()); 2427 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2428 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2429 MultiExprArg(*this, Args, NumArgs), 2430 0); 2431 if (BaseInit.isInvalid()) 2432 return true; 2433 2434 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2435 2436 // C++0x [class.base.init]p7: 2437 // The initialization of each base and member constitutes a 2438 // full-expression. 2439 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2440 if (BaseInit.isInvalid()) 2441 return true; 2442 2443 // If we are in a dependent context, template instantiation will 2444 // perform this type-checking again. Just save the arguments that we 2445 // received in a ParenListExpr. 2446 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2447 // of the information that we have about the base 2448 // initializer. However, deconstructing the ASTs is a dicey process, 2449 // and this approach is far more likely to get the corner cases right. 2450 if (CurContext->isDependentContext()) 2451 BaseInit = Owned(Init); 2452 2453 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2454 BaseSpec->isVirtual(), 2455 InitRange.getBegin(), 2456 BaseInit.takeAs<Expr>(), 2457 InitRange.getEnd(), EllipsisLoc); 2458} 2459 2460// Create a static_cast\<T&&>(expr). 2461static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2462 QualType ExprType = E->getType(); 2463 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2464 SourceLocation ExprLoc = E->getLocStart(); 2465 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2466 TargetType, ExprLoc); 2467 2468 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2469 SourceRange(ExprLoc, ExprLoc), 2470 E->getSourceRange()).take(); 2471} 2472 2473/// ImplicitInitializerKind - How an implicit base or member initializer should 2474/// initialize its base or member. 2475enum ImplicitInitializerKind { 2476 IIK_Default, 2477 IIK_Copy, 2478 IIK_Move 2479}; 2480 2481static bool 2482BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2483 ImplicitInitializerKind ImplicitInitKind, 2484 CXXBaseSpecifier *BaseSpec, 2485 bool IsInheritedVirtualBase, 2486 CXXCtorInitializer *&CXXBaseInit) { 2487 InitializedEntity InitEntity 2488 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2489 IsInheritedVirtualBase); 2490 2491 ExprResult BaseInit; 2492 2493 switch (ImplicitInitKind) { 2494 case IIK_Default: { 2495 InitializationKind InitKind 2496 = InitializationKind::CreateDefault(Constructor->getLocation()); 2497 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2498 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2499 MultiExprArg(SemaRef, 0, 0)); 2500 break; 2501 } 2502 2503 case IIK_Move: 2504 case IIK_Copy: { 2505 bool Moving = ImplicitInitKind == IIK_Move; 2506 ParmVarDecl *Param = Constructor->getParamDecl(0); 2507 QualType ParamType = Param->getType().getNonReferenceType(); 2508 2509 Expr *CopyCtorArg = 2510 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2511 SourceLocation(), Param, false, 2512 Constructor->getLocation(), ParamType, 2513 VK_LValue, 0); 2514 2515 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2516 2517 // Cast to the base class to avoid ambiguities. 2518 QualType ArgTy = 2519 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2520 ParamType.getQualifiers()); 2521 2522 if (Moving) { 2523 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2524 } 2525 2526 CXXCastPath BasePath; 2527 BasePath.push_back(BaseSpec); 2528 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2529 CK_UncheckedDerivedToBase, 2530 Moving ? VK_XValue : VK_LValue, 2531 &BasePath).take(); 2532 2533 InitializationKind InitKind 2534 = InitializationKind::CreateDirect(Constructor->getLocation(), 2535 SourceLocation(), SourceLocation()); 2536 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2537 &CopyCtorArg, 1); 2538 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2539 MultiExprArg(&CopyCtorArg, 1)); 2540 break; 2541 } 2542 } 2543 2544 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2545 if (BaseInit.isInvalid()) 2546 return true; 2547 2548 CXXBaseInit = 2549 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2550 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2551 SourceLocation()), 2552 BaseSpec->isVirtual(), 2553 SourceLocation(), 2554 BaseInit.takeAs<Expr>(), 2555 SourceLocation(), 2556 SourceLocation()); 2557 2558 return false; 2559} 2560 2561static bool RefersToRValueRef(Expr *MemRef) { 2562 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2563 return Referenced->getType()->isRValueReferenceType(); 2564} 2565 2566static bool 2567BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2568 ImplicitInitializerKind ImplicitInitKind, 2569 FieldDecl *Field, IndirectFieldDecl *Indirect, 2570 CXXCtorInitializer *&CXXMemberInit) { 2571 if (Field->isInvalidDecl()) 2572 return true; 2573 2574 SourceLocation Loc = Constructor->getLocation(); 2575 2576 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2577 bool Moving = ImplicitInitKind == IIK_Move; 2578 ParmVarDecl *Param = Constructor->getParamDecl(0); 2579 QualType ParamType = Param->getType().getNonReferenceType(); 2580 2581 // Suppress copying zero-width bitfields. 2582 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2583 return false; 2584 2585 Expr *MemberExprBase = 2586 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2587 SourceLocation(), Param, false, 2588 Loc, ParamType, VK_LValue, 0); 2589 2590 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2591 2592 if (Moving) { 2593 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2594 } 2595 2596 // Build a reference to this field within the parameter. 2597 CXXScopeSpec SS; 2598 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2599 Sema::LookupMemberName); 2600 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2601 : cast<ValueDecl>(Field), AS_public); 2602 MemberLookup.resolveKind(); 2603 ExprResult CtorArg 2604 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2605 ParamType, Loc, 2606 /*IsArrow=*/false, 2607 SS, 2608 /*TemplateKWLoc=*/SourceLocation(), 2609 /*FirstQualifierInScope=*/0, 2610 MemberLookup, 2611 /*TemplateArgs=*/0); 2612 if (CtorArg.isInvalid()) 2613 return true; 2614 2615 // C++11 [class.copy]p15: 2616 // - if a member m has rvalue reference type T&&, it is direct-initialized 2617 // with static_cast<T&&>(x.m); 2618 if (RefersToRValueRef(CtorArg.get())) { 2619 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2620 } 2621 2622 // When the field we are copying is an array, create index variables for 2623 // each dimension of the array. We use these index variables to subscript 2624 // the source array, and other clients (e.g., CodeGen) will perform the 2625 // necessary iteration with these index variables. 2626 SmallVector<VarDecl *, 4> IndexVariables; 2627 QualType BaseType = Field->getType(); 2628 QualType SizeType = SemaRef.Context.getSizeType(); 2629 bool InitializingArray = false; 2630 while (const ConstantArrayType *Array 2631 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2632 InitializingArray = true; 2633 // Create the iteration variable for this array index. 2634 IdentifierInfo *IterationVarName = 0; 2635 { 2636 SmallString<8> Str; 2637 llvm::raw_svector_ostream OS(Str); 2638 OS << "__i" << IndexVariables.size(); 2639 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2640 } 2641 VarDecl *IterationVar 2642 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2643 IterationVarName, SizeType, 2644 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2645 SC_None, SC_None); 2646 IndexVariables.push_back(IterationVar); 2647 2648 // Create a reference to the iteration variable. 2649 ExprResult IterationVarRef 2650 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2651 assert(!IterationVarRef.isInvalid() && 2652 "Reference to invented variable cannot fail!"); 2653 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2654 assert(!IterationVarRef.isInvalid() && 2655 "Conversion of invented variable cannot fail!"); 2656 2657 // Subscript the array with this iteration variable. 2658 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2659 IterationVarRef.take(), 2660 Loc); 2661 if (CtorArg.isInvalid()) 2662 return true; 2663 2664 BaseType = Array->getElementType(); 2665 } 2666 2667 // The array subscript expression is an lvalue, which is wrong for moving. 2668 if (Moving && InitializingArray) 2669 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2670 2671 // Construct the entity that we will be initializing. For an array, this 2672 // will be first element in the array, which may require several levels 2673 // of array-subscript entities. 2674 SmallVector<InitializedEntity, 4> Entities; 2675 Entities.reserve(1 + IndexVariables.size()); 2676 if (Indirect) 2677 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2678 else 2679 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2680 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2681 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2682 0, 2683 Entities.back())); 2684 2685 // Direct-initialize to use the copy constructor. 2686 InitializationKind InitKind = 2687 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2688 2689 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2690 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2691 &CtorArgE, 1); 2692 2693 ExprResult MemberInit 2694 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2695 MultiExprArg(&CtorArgE, 1)); 2696 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2697 if (MemberInit.isInvalid()) 2698 return true; 2699 2700 if (Indirect) { 2701 assert(IndexVariables.size() == 0 && 2702 "Indirect field improperly initialized"); 2703 CXXMemberInit 2704 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2705 Loc, Loc, 2706 MemberInit.takeAs<Expr>(), 2707 Loc); 2708 } else 2709 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2710 Loc, MemberInit.takeAs<Expr>(), 2711 Loc, 2712 IndexVariables.data(), 2713 IndexVariables.size()); 2714 return false; 2715 } 2716 2717 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2718 2719 QualType FieldBaseElementType = 2720 SemaRef.Context.getBaseElementType(Field->getType()); 2721 2722 if (FieldBaseElementType->isRecordType()) { 2723 InitializedEntity InitEntity 2724 = Indirect? InitializedEntity::InitializeMember(Indirect) 2725 : InitializedEntity::InitializeMember(Field); 2726 InitializationKind InitKind = 2727 InitializationKind::CreateDefault(Loc); 2728 2729 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2730 ExprResult MemberInit = 2731 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2732 2733 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2734 if (MemberInit.isInvalid()) 2735 return true; 2736 2737 if (Indirect) 2738 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2739 Indirect, Loc, 2740 Loc, 2741 MemberInit.get(), 2742 Loc); 2743 else 2744 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2745 Field, Loc, Loc, 2746 MemberInit.get(), 2747 Loc); 2748 return false; 2749 } 2750 2751 if (!Field->getParent()->isUnion()) { 2752 if (FieldBaseElementType->isReferenceType()) { 2753 SemaRef.Diag(Constructor->getLocation(), 2754 diag::err_uninitialized_member_in_ctor) 2755 << (int)Constructor->isImplicit() 2756 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2757 << 0 << Field->getDeclName(); 2758 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2759 return true; 2760 } 2761 2762 if (FieldBaseElementType.isConstQualified()) { 2763 SemaRef.Diag(Constructor->getLocation(), 2764 diag::err_uninitialized_member_in_ctor) 2765 << (int)Constructor->isImplicit() 2766 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2767 << 1 << Field->getDeclName(); 2768 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2769 return true; 2770 } 2771 } 2772 2773 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2774 FieldBaseElementType->isObjCRetainableType() && 2775 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2776 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2777 // ARC: 2778 // Default-initialize Objective-C pointers to NULL. 2779 CXXMemberInit 2780 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2781 Loc, Loc, 2782 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2783 Loc); 2784 return false; 2785 } 2786 2787 // Nothing to initialize. 2788 CXXMemberInit = 0; 2789 return false; 2790} 2791 2792namespace { 2793struct BaseAndFieldInfo { 2794 Sema &S; 2795 CXXConstructorDecl *Ctor; 2796 bool AnyErrorsInInits; 2797 ImplicitInitializerKind IIK; 2798 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2799 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2800 2801 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2802 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2803 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2804 if (Generated && Ctor->isCopyConstructor()) 2805 IIK = IIK_Copy; 2806 else if (Generated && Ctor->isMoveConstructor()) 2807 IIK = IIK_Move; 2808 else 2809 IIK = IIK_Default; 2810 } 2811 2812 bool isImplicitCopyOrMove() const { 2813 switch (IIK) { 2814 case IIK_Copy: 2815 case IIK_Move: 2816 return true; 2817 2818 case IIK_Default: 2819 return false; 2820 } 2821 2822 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2823 } 2824}; 2825} 2826 2827/// \brief Determine whether the given indirect field declaration is somewhere 2828/// within an anonymous union. 2829static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2830 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2831 CEnd = F->chain_end(); 2832 C != CEnd; ++C) 2833 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2834 if (Record->isUnion()) 2835 return true; 2836 2837 return false; 2838} 2839 2840/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2841/// array type. 2842static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2843 if (T->isIncompleteArrayType()) 2844 return true; 2845 2846 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2847 if (!ArrayT->getSize()) 2848 return true; 2849 2850 T = ArrayT->getElementType(); 2851 } 2852 2853 return false; 2854} 2855 2856static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2857 FieldDecl *Field, 2858 IndirectFieldDecl *Indirect = 0) { 2859 2860 // Overwhelmingly common case: we have a direct initializer for this field. 2861 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2862 Info.AllToInit.push_back(Init); 2863 return false; 2864 } 2865 2866 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2867 // has a brace-or-equal-initializer, the entity is initialized as specified 2868 // in [dcl.init]. 2869 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2870 CXXCtorInitializer *Init; 2871 if (Indirect) 2872 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2873 SourceLocation(), 2874 SourceLocation(), 0, 2875 SourceLocation()); 2876 else 2877 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2878 SourceLocation(), 2879 SourceLocation(), 0, 2880 SourceLocation()); 2881 Info.AllToInit.push_back(Init); 2882 2883 // Check whether this initializer makes the field "used". 2884 Expr *InitExpr = Field->getInClassInitializer(); 2885 if (Field->getType()->isRecordType() || 2886 (InitExpr && InitExpr->HasSideEffects(SemaRef.Context))) 2887 SemaRef.UnusedPrivateFields.remove(Field); 2888 2889 return false; 2890 } 2891 2892 // Don't build an implicit initializer for union members if none was 2893 // explicitly specified. 2894 if (Field->getParent()->isUnion() || 2895 (Indirect && isWithinAnonymousUnion(Indirect))) 2896 return false; 2897 2898 // Don't initialize incomplete or zero-length arrays. 2899 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2900 return false; 2901 2902 // Don't try to build an implicit initializer if there were semantic 2903 // errors in any of the initializers (and therefore we might be 2904 // missing some that the user actually wrote). 2905 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2906 return false; 2907 2908 CXXCtorInitializer *Init = 0; 2909 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2910 Indirect, Init)) 2911 return true; 2912 2913 if (Init) 2914 Info.AllToInit.push_back(Init); 2915 2916 return false; 2917} 2918 2919bool 2920Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2921 CXXCtorInitializer *Initializer) { 2922 assert(Initializer->isDelegatingInitializer()); 2923 Constructor->setNumCtorInitializers(1); 2924 CXXCtorInitializer **initializer = 2925 new (Context) CXXCtorInitializer*[1]; 2926 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2927 Constructor->setCtorInitializers(initializer); 2928 2929 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2930 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 2931 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2932 } 2933 2934 DelegatingCtorDecls.push_back(Constructor); 2935 2936 return false; 2937} 2938 2939bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2940 CXXCtorInitializer **Initializers, 2941 unsigned NumInitializers, 2942 bool AnyErrors) { 2943 if (Constructor->isDependentContext()) { 2944 // Just store the initializers as written, they will be checked during 2945 // instantiation. 2946 if (NumInitializers > 0) { 2947 Constructor->setNumCtorInitializers(NumInitializers); 2948 CXXCtorInitializer **baseOrMemberInitializers = 2949 new (Context) CXXCtorInitializer*[NumInitializers]; 2950 memcpy(baseOrMemberInitializers, Initializers, 2951 NumInitializers * sizeof(CXXCtorInitializer*)); 2952 Constructor->setCtorInitializers(baseOrMemberInitializers); 2953 } 2954 2955 return false; 2956 } 2957 2958 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2959 2960 // We need to build the initializer AST according to order of construction 2961 // and not what user specified in the Initializers list. 2962 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2963 if (!ClassDecl) 2964 return true; 2965 2966 bool HadError = false; 2967 2968 for (unsigned i = 0; i < NumInitializers; i++) { 2969 CXXCtorInitializer *Member = Initializers[i]; 2970 2971 if (Member->isBaseInitializer()) 2972 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2973 else 2974 Info.AllBaseFields[Member->getAnyMember()] = Member; 2975 } 2976 2977 // Keep track of the direct virtual bases. 2978 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2979 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2980 E = ClassDecl->bases_end(); I != E; ++I) { 2981 if (I->isVirtual()) 2982 DirectVBases.insert(I); 2983 } 2984 2985 // Push virtual bases before others. 2986 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2987 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2988 2989 if (CXXCtorInitializer *Value 2990 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2991 Info.AllToInit.push_back(Value); 2992 } else if (!AnyErrors) { 2993 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2994 CXXCtorInitializer *CXXBaseInit; 2995 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2996 VBase, IsInheritedVirtualBase, 2997 CXXBaseInit)) { 2998 HadError = true; 2999 continue; 3000 } 3001 3002 Info.AllToInit.push_back(CXXBaseInit); 3003 } 3004 } 3005 3006 // Non-virtual bases. 3007 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3008 E = ClassDecl->bases_end(); Base != E; ++Base) { 3009 // Virtuals are in the virtual base list and already constructed. 3010 if (Base->isVirtual()) 3011 continue; 3012 3013 if (CXXCtorInitializer *Value 3014 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3015 Info.AllToInit.push_back(Value); 3016 } else if (!AnyErrors) { 3017 CXXCtorInitializer *CXXBaseInit; 3018 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3019 Base, /*IsInheritedVirtualBase=*/false, 3020 CXXBaseInit)) { 3021 HadError = true; 3022 continue; 3023 } 3024 3025 Info.AllToInit.push_back(CXXBaseInit); 3026 } 3027 } 3028 3029 // Fields. 3030 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3031 MemEnd = ClassDecl->decls_end(); 3032 Mem != MemEnd; ++Mem) { 3033 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3034 // C++ [class.bit]p2: 3035 // A declaration for a bit-field that omits the identifier declares an 3036 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3037 // initialized. 3038 if (F->isUnnamedBitfield()) 3039 continue; 3040 3041 // If we're not generating the implicit copy/move constructor, then we'll 3042 // handle anonymous struct/union fields based on their individual 3043 // indirect fields. 3044 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 3045 continue; 3046 3047 if (CollectFieldInitializer(*this, Info, F)) 3048 HadError = true; 3049 continue; 3050 } 3051 3052 // Beyond this point, we only consider default initialization. 3053 if (Info.IIK != IIK_Default) 3054 continue; 3055 3056 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3057 if (F->getType()->isIncompleteArrayType()) { 3058 assert(ClassDecl->hasFlexibleArrayMember() && 3059 "Incomplete array type is not valid"); 3060 continue; 3061 } 3062 3063 // Initialize each field of an anonymous struct individually. 3064 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3065 HadError = true; 3066 3067 continue; 3068 } 3069 } 3070 3071 NumInitializers = Info.AllToInit.size(); 3072 if (NumInitializers > 0) { 3073 Constructor->setNumCtorInitializers(NumInitializers); 3074 CXXCtorInitializer **baseOrMemberInitializers = 3075 new (Context) CXXCtorInitializer*[NumInitializers]; 3076 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3077 NumInitializers * sizeof(CXXCtorInitializer*)); 3078 Constructor->setCtorInitializers(baseOrMemberInitializers); 3079 3080 // Constructors implicitly reference the base and member 3081 // destructors. 3082 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3083 Constructor->getParent()); 3084 } 3085 3086 return HadError; 3087} 3088 3089static void *GetKeyForTopLevelField(FieldDecl *Field) { 3090 // For anonymous unions, use the class declaration as the key. 3091 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3092 if (RT->getDecl()->isAnonymousStructOrUnion()) 3093 return static_cast<void *>(RT->getDecl()); 3094 } 3095 return static_cast<void *>(Field); 3096} 3097 3098static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3099 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3100} 3101 3102static void *GetKeyForMember(ASTContext &Context, 3103 CXXCtorInitializer *Member) { 3104 if (!Member->isAnyMemberInitializer()) 3105 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3106 3107 // For fields injected into the class via declaration of an anonymous union, 3108 // use its anonymous union class declaration as the unique key. 3109 FieldDecl *Field = Member->getAnyMember(); 3110 3111 // If the field is a member of an anonymous struct or union, our key 3112 // is the anonymous record decl that's a direct child of the class. 3113 RecordDecl *RD = Field->getParent(); 3114 if (RD->isAnonymousStructOrUnion()) { 3115 while (true) { 3116 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3117 if (Parent->isAnonymousStructOrUnion()) 3118 RD = Parent; 3119 else 3120 break; 3121 } 3122 3123 return static_cast<void *>(RD); 3124 } 3125 3126 return static_cast<void *>(Field); 3127} 3128 3129static void 3130DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3131 const CXXConstructorDecl *Constructor, 3132 CXXCtorInitializer **Inits, 3133 unsigned NumInits) { 3134 if (Constructor->getDeclContext()->isDependentContext()) 3135 return; 3136 3137 // Don't check initializers order unless the warning is enabled at the 3138 // location of at least one initializer. 3139 bool ShouldCheckOrder = false; 3140 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3141 CXXCtorInitializer *Init = Inits[InitIndex]; 3142 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3143 Init->getSourceLocation()) 3144 != DiagnosticsEngine::Ignored) { 3145 ShouldCheckOrder = true; 3146 break; 3147 } 3148 } 3149 if (!ShouldCheckOrder) 3150 return; 3151 3152 // Build the list of bases and members in the order that they'll 3153 // actually be initialized. The explicit initializers should be in 3154 // this same order but may be missing things. 3155 SmallVector<const void*, 32> IdealInitKeys; 3156 3157 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3158 3159 // 1. Virtual bases. 3160 for (CXXRecordDecl::base_class_const_iterator VBase = 3161 ClassDecl->vbases_begin(), 3162 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3163 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3164 3165 // 2. Non-virtual bases. 3166 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3167 E = ClassDecl->bases_end(); Base != E; ++Base) { 3168 if (Base->isVirtual()) 3169 continue; 3170 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3171 } 3172 3173 // 3. Direct fields. 3174 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3175 E = ClassDecl->field_end(); Field != E; ++Field) { 3176 if (Field->isUnnamedBitfield()) 3177 continue; 3178 3179 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3180 } 3181 3182 unsigned NumIdealInits = IdealInitKeys.size(); 3183 unsigned IdealIndex = 0; 3184 3185 CXXCtorInitializer *PrevInit = 0; 3186 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3187 CXXCtorInitializer *Init = Inits[InitIndex]; 3188 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3189 3190 // Scan forward to try to find this initializer in the idealized 3191 // initializers list. 3192 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3193 if (InitKey == IdealInitKeys[IdealIndex]) 3194 break; 3195 3196 // If we didn't find this initializer, it must be because we 3197 // scanned past it on a previous iteration. That can only 3198 // happen if we're out of order; emit a warning. 3199 if (IdealIndex == NumIdealInits && PrevInit) { 3200 Sema::SemaDiagnosticBuilder D = 3201 SemaRef.Diag(PrevInit->getSourceLocation(), 3202 diag::warn_initializer_out_of_order); 3203 3204 if (PrevInit->isAnyMemberInitializer()) 3205 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3206 else 3207 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3208 3209 if (Init->isAnyMemberInitializer()) 3210 D << 0 << Init->getAnyMember()->getDeclName(); 3211 else 3212 D << 1 << Init->getTypeSourceInfo()->getType(); 3213 3214 // Move back to the initializer's location in the ideal list. 3215 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3216 if (InitKey == IdealInitKeys[IdealIndex]) 3217 break; 3218 3219 assert(IdealIndex != NumIdealInits && 3220 "initializer not found in initializer list"); 3221 } 3222 3223 PrevInit = Init; 3224 } 3225} 3226 3227namespace { 3228bool CheckRedundantInit(Sema &S, 3229 CXXCtorInitializer *Init, 3230 CXXCtorInitializer *&PrevInit) { 3231 if (!PrevInit) { 3232 PrevInit = Init; 3233 return false; 3234 } 3235 3236 if (FieldDecl *Field = Init->getMember()) 3237 S.Diag(Init->getSourceLocation(), 3238 diag::err_multiple_mem_initialization) 3239 << Field->getDeclName() 3240 << Init->getSourceRange(); 3241 else { 3242 const Type *BaseClass = Init->getBaseClass(); 3243 assert(BaseClass && "neither field nor base"); 3244 S.Diag(Init->getSourceLocation(), 3245 diag::err_multiple_base_initialization) 3246 << QualType(BaseClass, 0) 3247 << Init->getSourceRange(); 3248 } 3249 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3250 << 0 << PrevInit->getSourceRange(); 3251 3252 return true; 3253} 3254 3255typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3256typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3257 3258bool CheckRedundantUnionInit(Sema &S, 3259 CXXCtorInitializer *Init, 3260 RedundantUnionMap &Unions) { 3261 FieldDecl *Field = Init->getAnyMember(); 3262 RecordDecl *Parent = Field->getParent(); 3263 NamedDecl *Child = Field; 3264 3265 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3266 if (Parent->isUnion()) { 3267 UnionEntry &En = Unions[Parent]; 3268 if (En.first && En.first != Child) { 3269 S.Diag(Init->getSourceLocation(), 3270 diag::err_multiple_mem_union_initialization) 3271 << Field->getDeclName() 3272 << Init->getSourceRange(); 3273 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3274 << 0 << En.second->getSourceRange(); 3275 return true; 3276 } 3277 if (!En.first) { 3278 En.first = Child; 3279 En.second = Init; 3280 } 3281 if (!Parent->isAnonymousStructOrUnion()) 3282 return false; 3283 } 3284 3285 Child = Parent; 3286 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3287 } 3288 3289 return false; 3290} 3291} 3292 3293/// ActOnMemInitializers - Handle the member initializers for a constructor. 3294void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3295 SourceLocation ColonLoc, 3296 CXXCtorInitializer **meminits, 3297 unsigned NumMemInits, 3298 bool AnyErrors) { 3299 if (!ConstructorDecl) 3300 return; 3301 3302 AdjustDeclIfTemplate(ConstructorDecl); 3303 3304 CXXConstructorDecl *Constructor 3305 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3306 3307 if (!Constructor) { 3308 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3309 return; 3310 } 3311 3312 CXXCtorInitializer **MemInits = 3313 reinterpret_cast<CXXCtorInitializer **>(meminits); 3314 3315 // Mapping for the duplicate initializers check. 3316 // For member initializers, this is keyed with a FieldDecl*. 3317 // For base initializers, this is keyed with a Type*. 3318 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3319 3320 // Mapping for the inconsistent anonymous-union initializers check. 3321 RedundantUnionMap MemberUnions; 3322 3323 bool HadError = false; 3324 for (unsigned i = 0; i < NumMemInits; i++) { 3325 CXXCtorInitializer *Init = MemInits[i]; 3326 3327 // Set the source order index. 3328 Init->setSourceOrder(i); 3329 3330 if (Init->isAnyMemberInitializer()) { 3331 FieldDecl *Field = Init->getAnyMember(); 3332 if (CheckRedundantInit(*this, Init, Members[Field]) || 3333 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3334 HadError = true; 3335 } else if (Init->isBaseInitializer()) { 3336 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3337 if (CheckRedundantInit(*this, Init, Members[Key])) 3338 HadError = true; 3339 } else { 3340 assert(Init->isDelegatingInitializer()); 3341 // This must be the only initializer 3342 if (i != 0 || NumMemInits > 1) { 3343 Diag(MemInits[0]->getSourceLocation(), 3344 diag::err_delegating_initializer_alone) 3345 << MemInits[0]->getSourceRange(); 3346 HadError = true; 3347 // We will treat this as being the only initializer. 3348 } 3349 SetDelegatingInitializer(Constructor, MemInits[i]); 3350 // Return immediately as the initializer is set. 3351 return; 3352 } 3353 } 3354 3355 if (HadError) 3356 return; 3357 3358 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3359 3360 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3361} 3362 3363void 3364Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3365 CXXRecordDecl *ClassDecl) { 3366 // Ignore dependent contexts. Also ignore unions, since their members never 3367 // have destructors implicitly called. 3368 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3369 return; 3370 3371 // FIXME: all the access-control diagnostics are positioned on the 3372 // field/base declaration. That's probably good; that said, the 3373 // user might reasonably want to know why the destructor is being 3374 // emitted, and we currently don't say. 3375 3376 // Non-static data members. 3377 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3378 E = ClassDecl->field_end(); I != E; ++I) { 3379 FieldDecl *Field = *I; 3380 if (Field->isInvalidDecl()) 3381 continue; 3382 3383 // Don't destroy incomplete or zero-length arrays. 3384 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3385 continue; 3386 3387 QualType FieldType = Context.getBaseElementType(Field->getType()); 3388 3389 const RecordType* RT = FieldType->getAs<RecordType>(); 3390 if (!RT) 3391 continue; 3392 3393 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3394 if (FieldClassDecl->isInvalidDecl()) 3395 continue; 3396 if (FieldClassDecl->hasIrrelevantDestructor()) 3397 continue; 3398 // The destructor for an implicit anonymous union member is never invoked. 3399 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3400 continue; 3401 3402 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3403 assert(Dtor && "No dtor found for FieldClassDecl!"); 3404 CheckDestructorAccess(Field->getLocation(), Dtor, 3405 PDiag(diag::err_access_dtor_field) 3406 << Field->getDeclName() 3407 << FieldType); 3408 3409 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3410 DiagnoseUseOfDecl(Dtor, Location); 3411 } 3412 3413 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3414 3415 // Bases. 3416 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3417 E = ClassDecl->bases_end(); Base != E; ++Base) { 3418 // Bases are always records in a well-formed non-dependent class. 3419 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3420 3421 // Remember direct virtual bases. 3422 if (Base->isVirtual()) 3423 DirectVirtualBases.insert(RT); 3424 3425 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3426 // If our base class is invalid, we probably can't get its dtor anyway. 3427 if (BaseClassDecl->isInvalidDecl()) 3428 continue; 3429 if (BaseClassDecl->hasIrrelevantDestructor()) 3430 continue; 3431 3432 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3433 assert(Dtor && "No dtor found for BaseClassDecl!"); 3434 3435 // FIXME: caret should be on the start of the class name 3436 CheckDestructorAccess(Base->getLocStart(), Dtor, 3437 PDiag(diag::err_access_dtor_base) 3438 << Base->getType() 3439 << Base->getSourceRange(), 3440 Context.getTypeDeclType(ClassDecl)); 3441 3442 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3443 DiagnoseUseOfDecl(Dtor, Location); 3444 } 3445 3446 // Virtual bases. 3447 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3448 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3449 3450 // Bases are always records in a well-formed non-dependent class. 3451 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3452 3453 // Ignore direct virtual bases. 3454 if (DirectVirtualBases.count(RT)) 3455 continue; 3456 3457 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3458 // If our base class is invalid, we probably can't get its dtor anyway. 3459 if (BaseClassDecl->isInvalidDecl()) 3460 continue; 3461 if (BaseClassDecl->hasIrrelevantDestructor()) 3462 continue; 3463 3464 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3465 assert(Dtor && "No dtor found for BaseClassDecl!"); 3466 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3467 PDiag(diag::err_access_dtor_vbase) 3468 << VBase->getType(), 3469 Context.getTypeDeclType(ClassDecl)); 3470 3471 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3472 DiagnoseUseOfDecl(Dtor, Location); 3473 } 3474} 3475 3476void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3477 if (!CDtorDecl) 3478 return; 3479 3480 if (CXXConstructorDecl *Constructor 3481 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3482 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3483} 3484 3485bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3486 unsigned DiagID, AbstractDiagSelID SelID) { 3487 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3488 unsigned DiagID; 3489 AbstractDiagSelID SelID; 3490 3491 public: 3492 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3493 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3494 3495 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 3496 if (SelID == -1) 3497 S.Diag(Loc, DiagID) << T; 3498 else 3499 S.Diag(Loc, DiagID) << SelID << T; 3500 } 3501 } Diagnoser(DiagID, SelID); 3502 3503 return RequireNonAbstractType(Loc, T, Diagnoser); 3504} 3505 3506bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3507 TypeDiagnoser &Diagnoser) { 3508 if (!getLangOpts().CPlusPlus) 3509 return false; 3510 3511 if (const ArrayType *AT = Context.getAsArrayType(T)) 3512 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3513 3514 if (const PointerType *PT = T->getAs<PointerType>()) { 3515 // Find the innermost pointer type. 3516 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3517 PT = T; 3518 3519 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3520 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3521 } 3522 3523 const RecordType *RT = T->getAs<RecordType>(); 3524 if (!RT) 3525 return false; 3526 3527 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3528 3529 // We can't answer whether something is abstract until it has a 3530 // definition. If it's currently being defined, we'll walk back 3531 // over all the declarations when we have a full definition. 3532 const CXXRecordDecl *Def = RD->getDefinition(); 3533 if (!Def || Def->isBeingDefined()) 3534 return false; 3535 3536 if (!RD->isAbstract()) 3537 return false; 3538 3539 Diagnoser.diagnose(*this, Loc, T); 3540 DiagnoseAbstractType(RD); 3541 3542 return true; 3543} 3544 3545void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3546 // Check if we've already emitted the list of pure virtual functions 3547 // for this class. 3548 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3549 return; 3550 3551 CXXFinalOverriderMap FinalOverriders; 3552 RD->getFinalOverriders(FinalOverriders); 3553 3554 // Keep a set of seen pure methods so we won't diagnose the same method 3555 // more than once. 3556 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3557 3558 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3559 MEnd = FinalOverriders.end(); 3560 M != MEnd; 3561 ++M) { 3562 for (OverridingMethods::iterator SO = M->second.begin(), 3563 SOEnd = M->second.end(); 3564 SO != SOEnd; ++SO) { 3565 // C++ [class.abstract]p4: 3566 // A class is abstract if it contains or inherits at least one 3567 // pure virtual function for which the final overrider is pure 3568 // virtual. 3569 3570 // 3571 if (SO->second.size() != 1) 3572 continue; 3573 3574 if (!SO->second.front().Method->isPure()) 3575 continue; 3576 3577 if (!SeenPureMethods.insert(SO->second.front().Method)) 3578 continue; 3579 3580 Diag(SO->second.front().Method->getLocation(), 3581 diag::note_pure_virtual_function) 3582 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3583 } 3584 } 3585 3586 if (!PureVirtualClassDiagSet) 3587 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3588 PureVirtualClassDiagSet->insert(RD); 3589} 3590 3591namespace { 3592struct AbstractUsageInfo { 3593 Sema &S; 3594 CXXRecordDecl *Record; 3595 CanQualType AbstractType; 3596 bool Invalid; 3597 3598 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3599 : S(S), Record(Record), 3600 AbstractType(S.Context.getCanonicalType( 3601 S.Context.getTypeDeclType(Record))), 3602 Invalid(false) {} 3603 3604 void DiagnoseAbstractType() { 3605 if (Invalid) return; 3606 S.DiagnoseAbstractType(Record); 3607 Invalid = true; 3608 } 3609 3610 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3611}; 3612 3613struct CheckAbstractUsage { 3614 AbstractUsageInfo &Info; 3615 const NamedDecl *Ctx; 3616 3617 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3618 : Info(Info), Ctx(Ctx) {} 3619 3620 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3621 switch (TL.getTypeLocClass()) { 3622#define ABSTRACT_TYPELOC(CLASS, PARENT) 3623#define TYPELOC(CLASS, PARENT) \ 3624 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3625#include "clang/AST/TypeLocNodes.def" 3626 } 3627 } 3628 3629 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3630 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3631 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3632 if (!TL.getArg(I)) 3633 continue; 3634 3635 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3636 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3637 } 3638 } 3639 3640 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3641 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3642 } 3643 3644 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3645 // Visit the type parameters from a permissive context. 3646 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3647 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3648 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3649 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3650 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3651 // TODO: other template argument types? 3652 } 3653 } 3654 3655 // Visit pointee types from a permissive context. 3656#define CheckPolymorphic(Type) \ 3657 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3658 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3659 } 3660 CheckPolymorphic(PointerTypeLoc) 3661 CheckPolymorphic(ReferenceTypeLoc) 3662 CheckPolymorphic(MemberPointerTypeLoc) 3663 CheckPolymorphic(BlockPointerTypeLoc) 3664 CheckPolymorphic(AtomicTypeLoc) 3665 3666 /// Handle all the types we haven't given a more specific 3667 /// implementation for above. 3668 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3669 // Every other kind of type that we haven't called out already 3670 // that has an inner type is either (1) sugar or (2) contains that 3671 // inner type in some way as a subobject. 3672 if (TypeLoc Next = TL.getNextTypeLoc()) 3673 return Visit(Next, Sel); 3674 3675 // If there's no inner type and we're in a permissive context, 3676 // don't diagnose. 3677 if (Sel == Sema::AbstractNone) return; 3678 3679 // Check whether the type matches the abstract type. 3680 QualType T = TL.getType(); 3681 if (T->isArrayType()) { 3682 Sel = Sema::AbstractArrayType; 3683 T = Info.S.Context.getBaseElementType(T); 3684 } 3685 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3686 if (CT != Info.AbstractType) return; 3687 3688 // It matched; do some magic. 3689 if (Sel == Sema::AbstractArrayType) { 3690 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3691 << T << TL.getSourceRange(); 3692 } else { 3693 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3694 << Sel << T << TL.getSourceRange(); 3695 } 3696 Info.DiagnoseAbstractType(); 3697 } 3698}; 3699 3700void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3701 Sema::AbstractDiagSelID Sel) { 3702 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3703} 3704 3705} 3706 3707/// Check for invalid uses of an abstract type in a method declaration. 3708static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3709 CXXMethodDecl *MD) { 3710 // No need to do the check on definitions, which require that 3711 // the return/param types be complete. 3712 if (MD->doesThisDeclarationHaveABody()) 3713 return; 3714 3715 // For safety's sake, just ignore it if we don't have type source 3716 // information. This should never happen for non-implicit methods, 3717 // but... 3718 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3719 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3720} 3721 3722/// Check for invalid uses of an abstract type within a class definition. 3723static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3724 CXXRecordDecl *RD) { 3725 for (CXXRecordDecl::decl_iterator 3726 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3727 Decl *D = *I; 3728 if (D->isImplicit()) continue; 3729 3730 // Methods and method templates. 3731 if (isa<CXXMethodDecl>(D)) { 3732 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3733 } else if (isa<FunctionTemplateDecl>(D)) { 3734 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3735 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3736 3737 // Fields and static variables. 3738 } else if (isa<FieldDecl>(D)) { 3739 FieldDecl *FD = cast<FieldDecl>(D); 3740 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3741 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3742 } else if (isa<VarDecl>(D)) { 3743 VarDecl *VD = cast<VarDecl>(D); 3744 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3745 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3746 3747 // Nested classes and class templates. 3748 } else if (isa<CXXRecordDecl>(D)) { 3749 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3750 } else if (isa<ClassTemplateDecl>(D)) { 3751 CheckAbstractClassUsage(Info, 3752 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3753 } 3754 } 3755} 3756 3757/// \brief Perform semantic checks on a class definition that has been 3758/// completing, introducing implicitly-declared members, checking for 3759/// abstract types, etc. 3760void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3761 if (!Record) 3762 return; 3763 3764 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3765 AbstractUsageInfo Info(*this, Record); 3766 CheckAbstractClassUsage(Info, Record); 3767 } 3768 3769 // If this is not an aggregate type and has no user-declared constructor, 3770 // complain about any non-static data members of reference or const scalar 3771 // type, since they will never get initializers. 3772 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3773 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3774 !Record->isLambda()) { 3775 bool Complained = false; 3776 for (RecordDecl::field_iterator F = Record->field_begin(), 3777 FEnd = Record->field_end(); 3778 F != FEnd; ++F) { 3779 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3780 continue; 3781 3782 if (F->getType()->isReferenceType() || 3783 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3784 if (!Complained) { 3785 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3786 << Record->getTagKind() << Record; 3787 Complained = true; 3788 } 3789 3790 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3791 << F->getType()->isReferenceType() 3792 << F->getDeclName(); 3793 } 3794 } 3795 } 3796 3797 if (Record->isDynamicClass() && !Record->isDependentType()) 3798 DynamicClasses.push_back(Record); 3799 3800 if (Record->getIdentifier()) { 3801 // C++ [class.mem]p13: 3802 // If T is the name of a class, then each of the following shall have a 3803 // name different from T: 3804 // - every member of every anonymous union that is a member of class T. 3805 // 3806 // C++ [class.mem]p14: 3807 // In addition, if class T has a user-declared constructor (12.1), every 3808 // non-static data member of class T shall have a name different from T. 3809 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3810 R.first != R.second; ++R.first) { 3811 NamedDecl *D = *R.first; 3812 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3813 isa<IndirectFieldDecl>(D)) { 3814 Diag(D->getLocation(), diag::err_member_name_of_class) 3815 << D->getDeclName(); 3816 break; 3817 } 3818 } 3819 } 3820 3821 // Warn if the class has virtual methods but non-virtual public destructor. 3822 if (Record->isPolymorphic() && !Record->isDependentType()) { 3823 CXXDestructorDecl *dtor = Record->getDestructor(); 3824 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3825 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3826 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3827 } 3828 3829 // See if a method overloads virtual methods in a base 3830 /// class without overriding any. 3831 if (!Record->isDependentType()) { 3832 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3833 MEnd = Record->method_end(); 3834 M != MEnd; ++M) { 3835 if (!M->isStatic()) 3836 DiagnoseHiddenVirtualMethods(Record, *M); 3837 } 3838 } 3839 3840 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3841 // function that is not a constructor declares that member function to be 3842 // const. [...] The class of which that function is a member shall be 3843 // a literal type. 3844 // 3845 // If the class has virtual bases, any constexpr members will already have 3846 // been diagnosed by the checks performed on the member declaration, so 3847 // suppress this (less useful) diagnostic. 3848 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3849 !Record->isLiteral() && !Record->getNumVBases()) { 3850 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3851 MEnd = Record->method_end(); 3852 M != MEnd; ++M) { 3853 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3854 switch (Record->getTemplateSpecializationKind()) { 3855 case TSK_ImplicitInstantiation: 3856 case TSK_ExplicitInstantiationDeclaration: 3857 case TSK_ExplicitInstantiationDefinition: 3858 // If a template instantiates to a non-literal type, but its members 3859 // instantiate to constexpr functions, the template is technically 3860 // ill-formed, but we allow it for sanity. 3861 continue; 3862 3863 case TSK_Undeclared: 3864 case TSK_ExplicitSpecialization: 3865 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 3866 diag::err_constexpr_method_non_literal); 3867 break; 3868 } 3869 3870 // Only produce one error per class. 3871 break; 3872 } 3873 } 3874 } 3875 3876 // Declare inherited constructors. We do this eagerly here because: 3877 // - The standard requires an eager diagnostic for conflicting inherited 3878 // constructors from different classes. 3879 // - The lazy declaration of the other implicit constructors is so as to not 3880 // waste space and performance on classes that are not meant to be 3881 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3882 // have inherited constructors. 3883 DeclareInheritedConstructors(Record); 3884} 3885 3886void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3887 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3888 ME = Record->method_end(); 3889 MI != ME; ++MI) 3890 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) 3891 CheckExplicitlyDefaultedSpecialMember(*MI); 3892} 3893 3894/// Is the special member function which would be selected to perform the 3895/// specified operation on the specified class type a constexpr constructor? 3896static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3897 Sema::CXXSpecialMember CSM, 3898 bool ConstArg) { 3899 Sema::SpecialMemberOverloadResult *SMOR = 3900 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 3901 false, false, false, false); 3902 if (!SMOR || !SMOR->getMethod()) 3903 // A constructor we wouldn't select can't be "involved in initializing" 3904 // anything. 3905 return true; 3906 return SMOR->getMethod()->isConstexpr(); 3907} 3908 3909/// Determine whether the specified special member function would be constexpr 3910/// if it were implicitly defined. 3911static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3912 Sema::CXXSpecialMember CSM, 3913 bool ConstArg) { 3914 if (!S.getLangOpts().CPlusPlus0x) 3915 return false; 3916 3917 // C++11 [dcl.constexpr]p4: 3918 // In the definition of a constexpr constructor [...] 3919 switch (CSM) { 3920 case Sema::CXXDefaultConstructor: 3921 // Since default constructor lookup is essentially trivial (and cannot 3922 // involve, for instance, template instantiation), we compute whether a 3923 // defaulted default constructor is constexpr directly within CXXRecordDecl. 3924 // 3925 // This is important for performance; we need to know whether the default 3926 // constructor is constexpr to determine whether the type is a literal type. 3927 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 3928 3929 case Sema::CXXCopyConstructor: 3930 case Sema::CXXMoveConstructor: 3931 // For copy or move constructors, we need to perform overload resolution. 3932 break; 3933 3934 case Sema::CXXCopyAssignment: 3935 case Sema::CXXMoveAssignment: 3936 case Sema::CXXDestructor: 3937 case Sema::CXXInvalid: 3938 return false; 3939 } 3940 3941 // -- if the class is a non-empty union, or for each non-empty anonymous 3942 // union member of a non-union class, exactly one non-static data member 3943 // shall be initialized; [DR1359] 3944 // 3945 // If we squint, this is guaranteed, since exactly one non-static data member 3946 // will be initialized (if the constructor isn't deleted), we just don't know 3947 // which one. 3948 if (ClassDecl->isUnion()) 3949 return true; 3950 3951 // -- the class shall not have any virtual base classes; 3952 if (ClassDecl->getNumVBases()) 3953 return false; 3954 3955 // -- every constructor involved in initializing [...] base class 3956 // sub-objects shall be a constexpr constructor; 3957 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 3958 BEnd = ClassDecl->bases_end(); 3959 B != BEnd; ++B) { 3960 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 3961 if (!BaseType) continue; 3962 3963 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 3964 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 3965 return false; 3966 } 3967 3968 // -- every constructor involved in initializing non-static data members 3969 // [...] shall be a constexpr constructor; 3970 // -- every non-static data member and base class sub-object shall be 3971 // initialized 3972 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 3973 FEnd = ClassDecl->field_end(); 3974 F != FEnd; ++F) { 3975 if (F->isInvalidDecl()) 3976 continue; 3977 if (const RecordType *RecordTy = 3978 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 3979 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 3980 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 3981 return false; 3982 } 3983 } 3984 3985 // All OK, it's constexpr! 3986 return true; 3987} 3988 3989static Sema::ImplicitExceptionSpecification 3990computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 3991 switch (S.getSpecialMember(MD)) { 3992 case Sema::CXXDefaultConstructor: 3993 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 3994 case Sema::CXXCopyConstructor: 3995 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 3996 case Sema::CXXCopyAssignment: 3997 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 3998 case Sema::CXXMoveConstructor: 3999 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 4000 case Sema::CXXMoveAssignment: 4001 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 4002 case Sema::CXXDestructor: 4003 return S.ComputeDefaultedDtorExceptionSpec(MD); 4004 case Sema::CXXInvalid: 4005 break; 4006 } 4007 llvm_unreachable("only special members have implicit exception specs"); 4008} 4009 4010static void 4011updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4012 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4013 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4014 ExceptSpec.getEPI(EPI); 4015 const FunctionProtoType *NewFPT = cast<FunctionProtoType>( 4016 S.Context.getFunctionType(FPT->getResultType(), FPT->arg_type_begin(), 4017 FPT->getNumArgs(), EPI)); 4018 FD->setType(QualType(NewFPT, 0)); 4019} 4020 4021void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4022 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4023 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4024 return; 4025 4026 // Evaluate the exception specification. 4027 ImplicitExceptionSpecification ExceptSpec = 4028 computeImplicitExceptionSpec(*this, Loc, MD); 4029 4030 // Update the type of the special member to use it. 4031 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4032 4033 // A user-provided destructor can be defined outside the class. When that 4034 // happens, be sure to update the exception specification on both 4035 // declarations. 4036 const FunctionProtoType *CanonicalFPT = 4037 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4038 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4039 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4040 CanonicalFPT, ExceptSpec); 4041} 4042 4043static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl); 4044static bool isImplicitCopyAssignmentArgConst(Sema &S, CXXRecordDecl *ClassDecl); 4045 4046void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4047 CXXRecordDecl *RD = MD->getParent(); 4048 CXXSpecialMember CSM = getSpecialMember(MD); 4049 4050 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4051 "not an explicitly-defaulted special member"); 4052 4053 // Whether this was the first-declared instance of the constructor. 4054 // This affects whether we implicitly add an exception spec and constexpr. 4055 bool First = MD == MD->getCanonicalDecl(); 4056 4057 bool HadError = false; 4058 4059 // C++11 [dcl.fct.def.default]p1: 4060 // A function that is explicitly defaulted shall 4061 // -- be a special member function (checked elsewhere), 4062 // -- have the same type (except for ref-qualifiers, and except that a 4063 // copy operation can take a non-const reference) as an implicit 4064 // declaration, and 4065 // -- not have default arguments. 4066 unsigned ExpectedParams = 1; 4067 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4068 ExpectedParams = 0; 4069 if (MD->getNumParams() != ExpectedParams) { 4070 // This also checks for default arguments: a copy or move constructor with a 4071 // default argument is classified as a default constructor, and assignment 4072 // operations and destructors can't have default arguments. 4073 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4074 << CSM << MD->getSourceRange(); 4075 HadError = true; 4076 } 4077 4078 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4079 4080 // Compute argument constness, constexpr, and triviality. 4081 bool CanHaveConstParam = false; 4082 bool Trivial; 4083 switch (CSM) { 4084 case CXXDefaultConstructor: 4085 Trivial = RD->hasTrivialDefaultConstructor(); 4086 break; 4087 case CXXCopyConstructor: 4088 CanHaveConstParam = isImplicitCopyCtorArgConst(*this, RD); 4089 Trivial = RD->hasTrivialCopyConstructor(); 4090 break; 4091 case CXXCopyAssignment: 4092 CanHaveConstParam = isImplicitCopyAssignmentArgConst(*this, RD); 4093 Trivial = RD->hasTrivialCopyAssignment(); 4094 break; 4095 case CXXMoveConstructor: 4096 Trivial = RD->hasTrivialMoveConstructor(); 4097 break; 4098 case CXXMoveAssignment: 4099 Trivial = RD->hasTrivialMoveAssignment(); 4100 break; 4101 case CXXDestructor: 4102 Trivial = RD->hasTrivialDestructor(); 4103 break; 4104 case CXXInvalid: 4105 llvm_unreachable("non-special member explicitly defaulted!"); 4106 } 4107 4108 QualType ReturnType = Context.VoidTy; 4109 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4110 // Check for return type matching. 4111 ReturnType = Type->getResultType(); 4112 QualType ExpectedReturnType = 4113 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4114 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4115 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4116 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4117 HadError = true; 4118 } 4119 4120 // A defaulted special member cannot have cv-qualifiers. 4121 if (Type->getTypeQuals()) { 4122 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4123 << (CSM == CXXMoveAssignment); 4124 HadError = true; 4125 } 4126 } 4127 4128 // Check for parameter type matching. 4129 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4130 bool HasConstParam = false; 4131 if (ExpectedParams && ArgType->isReferenceType()) { 4132 // Argument must be reference to possibly-const T. 4133 QualType ReferentType = ArgType->getPointeeType(); 4134 HasConstParam = ReferentType.isConstQualified(); 4135 4136 if (ReferentType.isVolatileQualified()) { 4137 Diag(MD->getLocation(), 4138 diag::err_defaulted_special_member_volatile_param) << CSM; 4139 HadError = true; 4140 } 4141 4142 if (HasConstParam && !CanHaveConstParam) { 4143 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4144 Diag(MD->getLocation(), 4145 diag::err_defaulted_special_member_copy_const_param) 4146 << (CSM == CXXCopyAssignment); 4147 // FIXME: Explain why this special member can't be const. 4148 } else { 4149 Diag(MD->getLocation(), 4150 diag::err_defaulted_special_member_move_const_param) 4151 << (CSM == CXXMoveAssignment); 4152 } 4153 HadError = true; 4154 } 4155 4156 // If a function is explicitly defaulted on its first declaration, it shall 4157 // have the same parameter type as if it had been implicitly declared. 4158 // (Presumably this is to prevent it from being trivial?) 4159 if (!HasConstParam && CanHaveConstParam && First) 4160 Diag(MD->getLocation(), 4161 diag::err_defaulted_special_member_copy_non_const_param) 4162 << (CSM == CXXCopyAssignment); 4163 } else if (ExpectedParams) { 4164 // A copy assignment operator can take its argument by value, but a 4165 // defaulted one cannot. 4166 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4167 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4168 HadError = true; 4169 } 4170 4171 // Rebuild the type with the implicit exception specification added, if we 4172 // are going to need it. 4173 const FunctionProtoType *ImplicitType = 0; 4174 if (First || Type->hasExceptionSpec()) { 4175 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4176 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4177 ImplicitType = cast<FunctionProtoType>( 4178 Context.getFunctionType(ReturnType, &ArgType, ExpectedParams, EPI)); 4179 } 4180 4181 // C++11 [dcl.fct.def.default]p2: 4182 // An explicitly-defaulted function may be declared constexpr only if it 4183 // would have been implicitly declared as constexpr, 4184 // Do not apply this rule to members of class templates, since core issue 1358 4185 // makes such functions always instantiate to constexpr functions. For 4186 // non-constructors, this is checked elsewhere. 4187 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4188 HasConstParam); 4189 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr && 4190 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4191 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4192 // FIXME: Explain why the constructor can't be constexpr. 4193 HadError = true; 4194 } 4195 // and may have an explicit exception-specification only if it is compatible 4196 // with the exception-specification on the implicit declaration. 4197 if (Type->hasExceptionSpec() && 4198 CheckEquivalentExceptionSpec( 4199 PDiag(diag::err_incorrect_defaulted_exception_spec) << CSM, 4200 PDiag(), ImplicitType, SourceLocation(), Type, MD->getLocation())) 4201 HadError = true; 4202 4203 // If a function is explicitly defaulted on its first declaration, 4204 if (First) { 4205 // -- it is implicitly considered to be constexpr if the implicit 4206 // definition would be, 4207 MD->setConstexpr(Constexpr); 4208 4209 // -- it is implicitly considered to have the same exception-specification 4210 // as if it had been implicitly declared, 4211 MD->setType(QualType(ImplicitType, 0)); 4212 4213 // Such a function is also trivial if the implicitly-declared function 4214 // would have been. 4215 MD->setTrivial(Trivial); 4216 } 4217 4218 if (ShouldDeleteSpecialMember(MD, CSM)) { 4219 if (First) { 4220 MD->setDeletedAsWritten(); 4221 } else { 4222 // C++11 [dcl.fct.def.default]p4: 4223 // [For a] user-provided explicitly-defaulted function [...] if such a 4224 // function is implicitly defined as deleted, the program is ill-formed. 4225 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4226 HadError = true; 4227 } 4228 } 4229 4230 if (HadError) 4231 MD->setInvalidDecl(); 4232} 4233 4234namespace { 4235struct SpecialMemberDeletionInfo { 4236 Sema &S; 4237 CXXMethodDecl *MD; 4238 Sema::CXXSpecialMember CSM; 4239 bool Diagnose; 4240 4241 // Properties of the special member, computed for convenience. 4242 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4243 SourceLocation Loc; 4244 4245 bool AllFieldsAreConst; 4246 4247 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4248 Sema::CXXSpecialMember CSM, bool Diagnose) 4249 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4250 IsConstructor(false), IsAssignment(false), IsMove(false), 4251 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4252 AllFieldsAreConst(true) { 4253 switch (CSM) { 4254 case Sema::CXXDefaultConstructor: 4255 case Sema::CXXCopyConstructor: 4256 IsConstructor = true; 4257 break; 4258 case Sema::CXXMoveConstructor: 4259 IsConstructor = true; 4260 IsMove = true; 4261 break; 4262 case Sema::CXXCopyAssignment: 4263 IsAssignment = true; 4264 break; 4265 case Sema::CXXMoveAssignment: 4266 IsAssignment = true; 4267 IsMove = true; 4268 break; 4269 case Sema::CXXDestructor: 4270 break; 4271 case Sema::CXXInvalid: 4272 llvm_unreachable("invalid special member kind"); 4273 } 4274 4275 if (MD->getNumParams()) { 4276 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4277 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4278 } 4279 } 4280 4281 bool inUnion() const { return MD->getParent()->isUnion(); } 4282 4283 /// Look up the corresponding special member in the given class. 4284 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4285 unsigned Quals) { 4286 unsigned TQ = MD->getTypeQualifiers(); 4287 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4288 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4289 Quals = 0; 4290 return S.LookupSpecialMember(Class, CSM, 4291 ConstArg || (Quals & Qualifiers::Const), 4292 VolatileArg || (Quals & Qualifiers::Volatile), 4293 MD->getRefQualifier() == RQ_RValue, 4294 TQ & Qualifiers::Const, 4295 TQ & Qualifiers::Volatile); 4296 } 4297 4298 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4299 4300 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4301 bool shouldDeleteForField(FieldDecl *FD); 4302 bool shouldDeleteForAllConstMembers(); 4303 4304 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4305 unsigned Quals); 4306 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4307 Sema::SpecialMemberOverloadResult *SMOR, 4308 bool IsDtorCallInCtor); 4309 4310 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4311}; 4312} 4313 4314/// Is the given special member inaccessible when used on the given 4315/// sub-object. 4316bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4317 CXXMethodDecl *target) { 4318 /// If we're operating on a base class, the object type is the 4319 /// type of this special member. 4320 QualType objectTy; 4321 AccessSpecifier access = target->getAccess();; 4322 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4323 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4324 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4325 4326 // If we're operating on a field, the object type is the type of the field. 4327 } else { 4328 objectTy = S.Context.getTypeDeclType(target->getParent()); 4329 } 4330 4331 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4332} 4333 4334/// Check whether we should delete a special member due to the implicit 4335/// definition containing a call to a special member of a subobject. 4336bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4337 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4338 bool IsDtorCallInCtor) { 4339 CXXMethodDecl *Decl = SMOR->getMethod(); 4340 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4341 4342 int DiagKind = -1; 4343 4344 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4345 DiagKind = !Decl ? 0 : 1; 4346 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4347 DiagKind = 2; 4348 else if (!isAccessible(Subobj, Decl)) 4349 DiagKind = 3; 4350 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4351 !Decl->isTrivial()) { 4352 // A member of a union must have a trivial corresponding special member. 4353 // As a weird special case, a destructor call from a union's constructor 4354 // must be accessible and non-deleted, but need not be trivial. Such a 4355 // destructor is never actually called, but is semantically checked as 4356 // if it were. 4357 DiagKind = 4; 4358 } 4359 4360 if (DiagKind == -1) 4361 return false; 4362 4363 if (Diagnose) { 4364 if (Field) { 4365 S.Diag(Field->getLocation(), 4366 diag::note_deleted_special_member_class_subobject) 4367 << CSM << MD->getParent() << /*IsField*/true 4368 << Field << DiagKind << IsDtorCallInCtor; 4369 } else { 4370 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4371 S.Diag(Base->getLocStart(), 4372 diag::note_deleted_special_member_class_subobject) 4373 << CSM << MD->getParent() << /*IsField*/false 4374 << Base->getType() << DiagKind << IsDtorCallInCtor; 4375 } 4376 4377 if (DiagKind == 1) 4378 S.NoteDeletedFunction(Decl); 4379 // FIXME: Explain inaccessibility if DiagKind == 3. 4380 } 4381 4382 return true; 4383} 4384 4385/// Check whether we should delete a special member function due to having a 4386/// direct or virtual base class or non-static data member of class type M. 4387bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4388 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 4389 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4390 4391 // C++11 [class.ctor]p5: 4392 // -- any direct or virtual base class, or non-static data member with no 4393 // brace-or-equal-initializer, has class type M (or array thereof) and 4394 // either M has no default constructor or overload resolution as applied 4395 // to M's default constructor results in an ambiguity or in a function 4396 // that is deleted or inaccessible 4397 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4398 // -- a direct or virtual base class B that cannot be copied/moved because 4399 // overload resolution, as applied to B's corresponding special member, 4400 // results in an ambiguity or a function that is deleted or inaccessible 4401 // from the defaulted special member 4402 // C++11 [class.dtor]p5: 4403 // -- any direct or virtual base class [...] has a type with a destructor 4404 // that is deleted or inaccessible 4405 if (!(CSM == Sema::CXXDefaultConstructor && 4406 Field && Field->hasInClassInitializer()) && 4407 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 4408 return true; 4409 4410 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4411 // -- any direct or virtual base class or non-static data member has a 4412 // type with a destructor that is deleted or inaccessible 4413 if (IsConstructor) { 4414 Sema::SpecialMemberOverloadResult *SMOR = 4415 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4416 false, false, false, false, false); 4417 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4418 return true; 4419 } 4420 4421 return false; 4422} 4423 4424/// Check whether we should delete a special member function due to the class 4425/// having a particular direct or virtual base class. 4426bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4427 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4428 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 4429} 4430 4431/// Check whether we should delete a special member function due to the class 4432/// having a particular non-static data member. 4433bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4434 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4435 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4436 4437 if (CSM == Sema::CXXDefaultConstructor) { 4438 // For a default constructor, all references must be initialized in-class 4439 // and, if a union, it must have a non-const member. 4440 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4441 if (Diagnose) 4442 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4443 << MD->getParent() << FD << FieldType << /*Reference*/0; 4444 return true; 4445 } 4446 // C++11 [class.ctor]p5: any non-variant non-static data member of 4447 // const-qualified type (or array thereof) with no 4448 // brace-or-equal-initializer does not have a user-provided default 4449 // constructor. 4450 if (!inUnion() && FieldType.isConstQualified() && 4451 !FD->hasInClassInitializer() && 4452 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4453 if (Diagnose) 4454 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4455 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4456 return true; 4457 } 4458 4459 if (inUnion() && !FieldType.isConstQualified()) 4460 AllFieldsAreConst = false; 4461 } else if (CSM == Sema::CXXCopyConstructor) { 4462 // For a copy constructor, data members must not be of rvalue reference 4463 // type. 4464 if (FieldType->isRValueReferenceType()) { 4465 if (Diagnose) 4466 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4467 << MD->getParent() << FD << FieldType; 4468 return true; 4469 } 4470 } else if (IsAssignment) { 4471 // For an assignment operator, data members must not be of reference type. 4472 if (FieldType->isReferenceType()) { 4473 if (Diagnose) 4474 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4475 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4476 return true; 4477 } 4478 if (!FieldRecord && FieldType.isConstQualified()) { 4479 // C++11 [class.copy]p23: 4480 // -- a non-static data member of const non-class type (or array thereof) 4481 if (Diagnose) 4482 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4483 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4484 return true; 4485 } 4486 } 4487 4488 if (FieldRecord) { 4489 // Some additional restrictions exist on the variant members. 4490 if (!inUnion() && FieldRecord->isUnion() && 4491 FieldRecord->isAnonymousStructOrUnion()) { 4492 bool AllVariantFieldsAreConst = true; 4493 4494 // FIXME: Handle anonymous unions declared within anonymous unions. 4495 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4496 UE = FieldRecord->field_end(); 4497 UI != UE; ++UI) { 4498 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4499 4500 if (!UnionFieldType.isConstQualified()) 4501 AllVariantFieldsAreConst = false; 4502 4503 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4504 if (UnionFieldRecord && 4505 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 4506 UnionFieldType.getCVRQualifiers())) 4507 return true; 4508 } 4509 4510 // At least one member in each anonymous union must be non-const 4511 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4512 FieldRecord->field_begin() != FieldRecord->field_end()) { 4513 if (Diagnose) 4514 S.Diag(FieldRecord->getLocation(), 4515 diag::note_deleted_default_ctor_all_const) 4516 << MD->getParent() << /*anonymous union*/1; 4517 return true; 4518 } 4519 4520 // Don't check the implicit member of the anonymous union type. 4521 // This is technically non-conformant, but sanity demands it. 4522 return false; 4523 } 4524 4525 if (shouldDeleteForClassSubobject(FieldRecord, FD, 4526 FieldType.getCVRQualifiers())) 4527 return true; 4528 } 4529 4530 return false; 4531} 4532 4533/// C++11 [class.ctor] p5: 4534/// A defaulted default constructor for a class X is defined as deleted if 4535/// X is a union and all of its variant members are of const-qualified type. 4536bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4537 // This is a silly definition, because it gives an empty union a deleted 4538 // default constructor. Don't do that. 4539 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4540 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4541 if (Diagnose) 4542 S.Diag(MD->getParent()->getLocation(), 4543 diag::note_deleted_default_ctor_all_const) 4544 << MD->getParent() << /*not anonymous union*/0; 4545 return true; 4546 } 4547 return false; 4548} 4549 4550/// Determine whether a defaulted special member function should be defined as 4551/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4552/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4553bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4554 bool Diagnose) { 4555 if (MD->isInvalidDecl()) 4556 return false; 4557 CXXRecordDecl *RD = MD->getParent(); 4558 assert(!RD->isDependentType() && "do deletion after instantiation"); 4559 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4560 return false; 4561 4562 // C++11 [expr.lambda.prim]p19: 4563 // The closure type associated with a lambda-expression has a 4564 // deleted (8.4.3) default constructor and a deleted copy 4565 // assignment operator. 4566 if (RD->isLambda() && 4567 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4568 if (Diagnose) 4569 Diag(RD->getLocation(), diag::note_lambda_decl); 4570 return true; 4571 } 4572 4573 // For an anonymous struct or union, the copy and assignment special members 4574 // will never be used, so skip the check. For an anonymous union declared at 4575 // namespace scope, the constructor and destructor are used. 4576 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4577 RD->isAnonymousStructOrUnion()) 4578 return false; 4579 4580 // C++11 [class.copy]p7, p18: 4581 // If the class definition declares a move constructor or move assignment 4582 // operator, an implicitly declared copy constructor or copy assignment 4583 // operator is defined as deleted. 4584 if (MD->isImplicit() && 4585 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4586 CXXMethodDecl *UserDeclaredMove = 0; 4587 4588 // In Microsoft mode, a user-declared move only causes the deletion of the 4589 // corresponding copy operation, not both copy operations. 4590 if (RD->hasUserDeclaredMoveConstructor() && 4591 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4592 if (!Diagnose) return true; 4593 UserDeclaredMove = RD->getMoveConstructor(); 4594 assert(UserDeclaredMove); 4595 } else if (RD->hasUserDeclaredMoveAssignment() && 4596 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4597 if (!Diagnose) return true; 4598 UserDeclaredMove = RD->getMoveAssignmentOperator(); 4599 assert(UserDeclaredMove); 4600 } 4601 4602 if (UserDeclaredMove) { 4603 Diag(UserDeclaredMove->getLocation(), 4604 diag::note_deleted_copy_user_declared_move) 4605 << (CSM == CXXCopyAssignment) << RD 4606 << UserDeclaredMove->isMoveAssignmentOperator(); 4607 return true; 4608 } 4609 } 4610 4611 // Do access control from the special member function 4612 ContextRAII MethodContext(*this, MD); 4613 4614 // C++11 [class.dtor]p5: 4615 // -- for a virtual destructor, lookup of the non-array deallocation function 4616 // results in an ambiguity or in a function that is deleted or inaccessible 4617 if (CSM == CXXDestructor && MD->isVirtual()) { 4618 FunctionDecl *OperatorDelete = 0; 4619 DeclarationName Name = 4620 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4621 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4622 OperatorDelete, false)) { 4623 if (Diagnose) 4624 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4625 return true; 4626 } 4627 } 4628 4629 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4630 4631 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4632 BE = RD->bases_end(); BI != BE; ++BI) 4633 if (!BI->isVirtual() && 4634 SMI.shouldDeleteForBase(BI)) 4635 return true; 4636 4637 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4638 BE = RD->vbases_end(); BI != BE; ++BI) 4639 if (SMI.shouldDeleteForBase(BI)) 4640 return true; 4641 4642 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4643 FE = RD->field_end(); FI != FE; ++FI) 4644 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4645 SMI.shouldDeleteForField(*FI)) 4646 return true; 4647 4648 if (SMI.shouldDeleteForAllConstMembers()) 4649 return true; 4650 4651 return false; 4652} 4653 4654/// \brief Data used with FindHiddenVirtualMethod 4655namespace { 4656 struct FindHiddenVirtualMethodData { 4657 Sema *S; 4658 CXXMethodDecl *Method; 4659 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4660 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4661 }; 4662} 4663 4664/// \brief Member lookup function that determines whether a given C++ 4665/// method overloads virtual methods in a base class without overriding any, 4666/// to be used with CXXRecordDecl::lookupInBases(). 4667static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4668 CXXBasePath &Path, 4669 void *UserData) { 4670 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4671 4672 FindHiddenVirtualMethodData &Data 4673 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4674 4675 DeclarationName Name = Data.Method->getDeclName(); 4676 assert(Name.getNameKind() == DeclarationName::Identifier); 4677 4678 bool foundSameNameMethod = false; 4679 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4680 for (Path.Decls = BaseRecord->lookup(Name); 4681 Path.Decls.first != Path.Decls.second; 4682 ++Path.Decls.first) { 4683 NamedDecl *D = *Path.Decls.first; 4684 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4685 MD = MD->getCanonicalDecl(); 4686 foundSameNameMethod = true; 4687 // Interested only in hidden virtual methods. 4688 if (!MD->isVirtual()) 4689 continue; 4690 // If the method we are checking overrides a method from its base 4691 // don't warn about the other overloaded methods. 4692 if (!Data.S->IsOverload(Data.Method, MD, false)) 4693 return true; 4694 // Collect the overload only if its hidden. 4695 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4696 overloadedMethods.push_back(MD); 4697 } 4698 } 4699 4700 if (foundSameNameMethod) 4701 Data.OverloadedMethods.append(overloadedMethods.begin(), 4702 overloadedMethods.end()); 4703 return foundSameNameMethod; 4704} 4705 4706/// \brief See if a method overloads virtual methods in a base class without 4707/// overriding any. 4708void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4709 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4710 MD->getLocation()) == DiagnosticsEngine::Ignored) 4711 return; 4712 if (!MD->getDeclName().isIdentifier()) 4713 return; 4714 4715 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4716 /*bool RecordPaths=*/false, 4717 /*bool DetectVirtual=*/false); 4718 FindHiddenVirtualMethodData Data; 4719 Data.Method = MD; 4720 Data.S = this; 4721 4722 // Keep the base methods that were overriden or introduced in the subclass 4723 // by 'using' in a set. A base method not in this set is hidden. 4724 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4725 res.first != res.second; ++res.first) { 4726 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4727 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4728 E = MD->end_overridden_methods(); 4729 I != E; ++I) 4730 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4731 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4732 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4733 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4734 } 4735 4736 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4737 !Data.OverloadedMethods.empty()) { 4738 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4739 << MD << (Data.OverloadedMethods.size() > 1); 4740 4741 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4742 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4743 Diag(overloadedMD->getLocation(), 4744 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4745 } 4746 } 4747} 4748 4749void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4750 Decl *TagDecl, 4751 SourceLocation LBrac, 4752 SourceLocation RBrac, 4753 AttributeList *AttrList) { 4754 if (!TagDecl) 4755 return; 4756 4757 AdjustDeclIfTemplate(TagDecl); 4758 4759 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 4760 if (l->getKind() != AttributeList::AT_Visibility) 4761 continue; 4762 l->setInvalid(); 4763 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 4764 l->getName(); 4765 } 4766 4767 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4768 // strict aliasing violation! 4769 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4770 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4771 4772 CheckCompletedCXXClass( 4773 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4774} 4775 4776/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4777/// special functions, such as the default constructor, copy 4778/// constructor, or destructor, to the given C++ class (C++ 4779/// [special]p1). This routine can only be executed just before the 4780/// definition of the class is complete. 4781void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4782 if (!ClassDecl->hasUserDeclaredConstructor()) 4783 ++ASTContext::NumImplicitDefaultConstructors; 4784 4785 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4786 ++ASTContext::NumImplicitCopyConstructors; 4787 4788 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4789 ++ASTContext::NumImplicitMoveConstructors; 4790 4791 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4792 ++ASTContext::NumImplicitCopyAssignmentOperators; 4793 4794 // If we have a dynamic class, then the copy assignment operator may be 4795 // virtual, so we have to declare it immediately. This ensures that, e.g., 4796 // it shows up in the right place in the vtable and that we diagnose 4797 // problems with the implicit exception specification. 4798 if (ClassDecl->isDynamicClass()) 4799 DeclareImplicitCopyAssignment(ClassDecl); 4800 } 4801 4802 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()) { 4803 ++ASTContext::NumImplicitMoveAssignmentOperators; 4804 4805 // Likewise for the move assignment operator. 4806 if (ClassDecl->isDynamicClass()) 4807 DeclareImplicitMoveAssignment(ClassDecl); 4808 } 4809 4810 if (!ClassDecl->hasUserDeclaredDestructor()) { 4811 ++ASTContext::NumImplicitDestructors; 4812 4813 // If we have a dynamic class, then the destructor may be virtual, so we 4814 // have to declare the destructor immediately. This ensures that, e.g., it 4815 // shows up in the right place in the vtable and that we diagnose problems 4816 // with the implicit exception specification. 4817 if (ClassDecl->isDynamicClass()) 4818 DeclareImplicitDestructor(ClassDecl); 4819 } 4820} 4821 4822void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4823 if (!D) 4824 return; 4825 4826 int NumParamList = D->getNumTemplateParameterLists(); 4827 for (int i = 0; i < NumParamList; i++) { 4828 TemplateParameterList* Params = D->getTemplateParameterList(i); 4829 for (TemplateParameterList::iterator Param = Params->begin(), 4830 ParamEnd = Params->end(); 4831 Param != ParamEnd; ++Param) { 4832 NamedDecl *Named = cast<NamedDecl>(*Param); 4833 if (Named->getDeclName()) { 4834 S->AddDecl(Named); 4835 IdResolver.AddDecl(Named); 4836 } 4837 } 4838 } 4839} 4840 4841void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4842 if (!D) 4843 return; 4844 4845 TemplateParameterList *Params = 0; 4846 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4847 Params = Template->getTemplateParameters(); 4848 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4849 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4850 Params = PartialSpec->getTemplateParameters(); 4851 else 4852 return; 4853 4854 for (TemplateParameterList::iterator Param = Params->begin(), 4855 ParamEnd = Params->end(); 4856 Param != ParamEnd; ++Param) { 4857 NamedDecl *Named = cast<NamedDecl>(*Param); 4858 if (Named->getDeclName()) { 4859 S->AddDecl(Named); 4860 IdResolver.AddDecl(Named); 4861 } 4862 } 4863} 4864 4865void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4866 if (!RecordD) return; 4867 AdjustDeclIfTemplate(RecordD); 4868 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4869 PushDeclContext(S, Record); 4870} 4871 4872void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4873 if (!RecordD) return; 4874 PopDeclContext(); 4875} 4876 4877/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4878/// parsing a top-level (non-nested) C++ class, and we are now 4879/// parsing those parts of the given Method declaration that could 4880/// not be parsed earlier (C++ [class.mem]p2), such as default 4881/// arguments. This action should enter the scope of the given 4882/// Method declaration as if we had just parsed the qualified method 4883/// name. However, it should not bring the parameters into scope; 4884/// that will be performed by ActOnDelayedCXXMethodParameter. 4885void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4886} 4887 4888/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4889/// C++ method declaration. We're (re-)introducing the given 4890/// function parameter into scope for use in parsing later parts of 4891/// the method declaration. For example, we could see an 4892/// ActOnParamDefaultArgument event for this parameter. 4893void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4894 if (!ParamD) 4895 return; 4896 4897 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4898 4899 // If this parameter has an unparsed default argument, clear it out 4900 // to make way for the parsed default argument. 4901 if (Param->hasUnparsedDefaultArg()) 4902 Param->setDefaultArg(0); 4903 4904 S->AddDecl(Param); 4905 if (Param->getDeclName()) 4906 IdResolver.AddDecl(Param); 4907} 4908 4909/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4910/// processing the delayed method declaration for Method. The method 4911/// declaration is now considered finished. There may be a separate 4912/// ActOnStartOfFunctionDef action later (not necessarily 4913/// immediately!) for this method, if it was also defined inside the 4914/// class body. 4915void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4916 if (!MethodD) 4917 return; 4918 4919 AdjustDeclIfTemplate(MethodD); 4920 4921 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4922 4923 // Now that we have our default arguments, check the constructor 4924 // again. It could produce additional diagnostics or affect whether 4925 // the class has implicitly-declared destructors, among other 4926 // things. 4927 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4928 CheckConstructor(Constructor); 4929 4930 // Check the default arguments, which we may have added. 4931 if (!Method->isInvalidDecl()) 4932 CheckCXXDefaultArguments(Method); 4933} 4934 4935/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4936/// the well-formedness of the constructor declarator @p D with type @p 4937/// R. If there are any errors in the declarator, this routine will 4938/// emit diagnostics and set the invalid bit to true. In any case, the type 4939/// will be updated to reflect a well-formed type for the constructor and 4940/// returned. 4941QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4942 StorageClass &SC) { 4943 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4944 4945 // C++ [class.ctor]p3: 4946 // A constructor shall not be virtual (10.3) or static (9.4). A 4947 // constructor can be invoked for a const, volatile or const 4948 // volatile object. A constructor shall not be declared const, 4949 // volatile, or const volatile (9.3.2). 4950 if (isVirtual) { 4951 if (!D.isInvalidType()) 4952 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4953 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4954 << SourceRange(D.getIdentifierLoc()); 4955 D.setInvalidType(); 4956 } 4957 if (SC == SC_Static) { 4958 if (!D.isInvalidType()) 4959 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4960 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4961 << SourceRange(D.getIdentifierLoc()); 4962 D.setInvalidType(); 4963 SC = SC_None; 4964 } 4965 4966 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4967 if (FTI.TypeQuals != 0) { 4968 if (FTI.TypeQuals & Qualifiers::Const) 4969 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4970 << "const" << SourceRange(D.getIdentifierLoc()); 4971 if (FTI.TypeQuals & Qualifiers::Volatile) 4972 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4973 << "volatile" << SourceRange(D.getIdentifierLoc()); 4974 if (FTI.TypeQuals & Qualifiers::Restrict) 4975 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4976 << "restrict" << SourceRange(D.getIdentifierLoc()); 4977 D.setInvalidType(); 4978 } 4979 4980 // C++0x [class.ctor]p4: 4981 // A constructor shall not be declared with a ref-qualifier. 4982 if (FTI.hasRefQualifier()) { 4983 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4984 << FTI.RefQualifierIsLValueRef 4985 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4986 D.setInvalidType(); 4987 } 4988 4989 // Rebuild the function type "R" without any type qualifiers (in 4990 // case any of the errors above fired) and with "void" as the 4991 // return type, since constructors don't have return types. 4992 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4993 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4994 return R; 4995 4996 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4997 EPI.TypeQuals = 0; 4998 EPI.RefQualifier = RQ_None; 4999 5000 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5001 Proto->getNumArgs(), EPI); 5002} 5003 5004/// CheckConstructor - Checks a fully-formed constructor for 5005/// well-formedness, issuing any diagnostics required. Returns true if 5006/// the constructor declarator is invalid. 5007void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5008 CXXRecordDecl *ClassDecl 5009 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5010 if (!ClassDecl) 5011 return Constructor->setInvalidDecl(); 5012 5013 // C++ [class.copy]p3: 5014 // A declaration of a constructor for a class X is ill-formed if 5015 // its first parameter is of type (optionally cv-qualified) X and 5016 // either there are no other parameters or else all other 5017 // parameters have default arguments. 5018 if (!Constructor->isInvalidDecl() && 5019 ((Constructor->getNumParams() == 1) || 5020 (Constructor->getNumParams() > 1 && 5021 Constructor->getParamDecl(1)->hasDefaultArg())) && 5022 Constructor->getTemplateSpecializationKind() 5023 != TSK_ImplicitInstantiation) { 5024 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5025 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5026 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5027 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5028 const char *ConstRef 5029 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5030 : " const &"; 5031 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5032 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5033 5034 // FIXME: Rather that making the constructor invalid, we should endeavor 5035 // to fix the type. 5036 Constructor->setInvalidDecl(); 5037 } 5038 } 5039} 5040 5041/// CheckDestructor - Checks a fully-formed destructor definition for 5042/// well-formedness, issuing any diagnostics required. Returns true 5043/// on error. 5044bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5045 CXXRecordDecl *RD = Destructor->getParent(); 5046 5047 if (Destructor->isVirtual()) { 5048 SourceLocation Loc; 5049 5050 if (!Destructor->isImplicit()) 5051 Loc = Destructor->getLocation(); 5052 else 5053 Loc = RD->getLocation(); 5054 5055 // If we have a virtual destructor, look up the deallocation function 5056 FunctionDecl *OperatorDelete = 0; 5057 DeclarationName Name = 5058 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5059 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5060 return true; 5061 5062 MarkFunctionReferenced(Loc, OperatorDelete); 5063 5064 Destructor->setOperatorDelete(OperatorDelete); 5065 } 5066 5067 return false; 5068} 5069 5070static inline bool 5071FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5072 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5073 FTI.ArgInfo[0].Param && 5074 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5075} 5076 5077/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5078/// the well-formednes of the destructor declarator @p D with type @p 5079/// R. If there are any errors in the declarator, this routine will 5080/// emit diagnostics and set the declarator to invalid. Even if this happens, 5081/// will be updated to reflect a well-formed type for the destructor and 5082/// returned. 5083QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5084 StorageClass& SC) { 5085 // C++ [class.dtor]p1: 5086 // [...] A typedef-name that names a class is a class-name 5087 // (7.1.3); however, a typedef-name that names a class shall not 5088 // be used as the identifier in the declarator for a destructor 5089 // declaration. 5090 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5091 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5092 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5093 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5094 else if (const TemplateSpecializationType *TST = 5095 DeclaratorType->getAs<TemplateSpecializationType>()) 5096 if (TST->isTypeAlias()) 5097 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5098 << DeclaratorType << 1; 5099 5100 // C++ [class.dtor]p2: 5101 // A destructor is used to destroy objects of its class type. A 5102 // destructor takes no parameters, and no return type can be 5103 // specified for it (not even void). The address of a destructor 5104 // shall not be taken. A destructor shall not be static. A 5105 // destructor can be invoked for a const, volatile or const 5106 // volatile object. A destructor shall not be declared const, 5107 // volatile or const volatile (9.3.2). 5108 if (SC == SC_Static) { 5109 if (!D.isInvalidType()) 5110 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5111 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5112 << SourceRange(D.getIdentifierLoc()) 5113 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5114 5115 SC = SC_None; 5116 } 5117 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5118 // Destructors don't have return types, but the parser will 5119 // happily parse something like: 5120 // 5121 // class X { 5122 // float ~X(); 5123 // }; 5124 // 5125 // The return type will be eliminated later. 5126 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5127 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5128 << SourceRange(D.getIdentifierLoc()); 5129 } 5130 5131 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5132 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5133 if (FTI.TypeQuals & Qualifiers::Const) 5134 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5135 << "const" << SourceRange(D.getIdentifierLoc()); 5136 if (FTI.TypeQuals & Qualifiers::Volatile) 5137 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5138 << "volatile" << SourceRange(D.getIdentifierLoc()); 5139 if (FTI.TypeQuals & Qualifiers::Restrict) 5140 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5141 << "restrict" << SourceRange(D.getIdentifierLoc()); 5142 D.setInvalidType(); 5143 } 5144 5145 // C++0x [class.dtor]p2: 5146 // A destructor shall not be declared with a ref-qualifier. 5147 if (FTI.hasRefQualifier()) { 5148 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5149 << FTI.RefQualifierIsLValueRef 5150 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5151 D.setInvalidType(); 5152 } 5153 5154 // Make sure we don't have any parameters. 5155 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5156 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5157 5158 // Delete the parameters. 5159 FTI.freeArgs(); 5160 D.setInvalidType(); 5161 } 5162 5163 // Make sure the destructor isn't variadic. 5164 if (FTI.isVariadic) { 5165 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5166 D.setInvalidType(); 5167 } 5168 5169 // Rebuild the function type "R" without any type qualifiers or 5170 // parameters (in case any of the errors above fired) and with 5171 // "void" as the return type, since destructors don't have return 5172 // types. 5173 if (!D.isInvalidType()) 5174 return R; 5175 5176 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5177 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5178 EPI.Variadic = false; 5179 EPI.TypeQuals = 0; 5180 EPI.RefQualifier = RQ_None; 5181 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5182} 5183 5184/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5185/// well-formednes of the conversion function declarator @p D with 5186/// type @p R. If there are any errors in the declarator, this routine 5187/// will emit diagnostics and return true. Otherwise, it will return 5188/// false. Either way, the type @p R will be updated to reflect a 5189/// well-formed type for the conversion operator. 5190void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5191 StorageClass& SC) { 5192 // C++ [class.conv.fct]p1: 5193 // Neither parameter types nor return type can be specified. The 5194 // type of a conversion function (8.3.5) is "function taking no 5195 // parameter returning conversion-type-id." 5196 if (SC == SC_Static) { 5197 if (!D.isInvalidType()) 5198 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5199 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5200 << SourceRange(D.getIdentifierLoc()); 5201 D.setInvalidType(); 5202 SC = SC_None; 5203 } 5204 5205 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5206 5207 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5208 // Conversion functions don't have return types, but the parser will 5209 // happily parse something like: 5210 // 5211 // class X { 5212 // float operator bool(); 5213 // }; 5214 // 5215 // The return type will be changed later anyway. 5216 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5217 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5218 << SourceRange(D.getIdentifierLoc()); 5219 D.setInvalidType(); 5220 } 5221 5222 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5223 5224 // Make sure we don't have any parameters. 5225 if (Proto->getNumArgs() > 0) { 5226 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5227 5228 // Delete the parameters. 5229 D.getFunctionTypeInfo().freeArgs(); 5230 D.setInvalidType(); 5231 } else if (Proto->isVariadic()) { 5232 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5233 D.setInvalidType(); 5234 } 5235 5236 // Diagnose "&operator bool()" and other such nonsense. This 5237 // is actually a gcc extension which we don't support. 5238 if (Proto->getResultType() != ConvType) { 5239 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5240 << Proto->getResultType(); 5241 D.setInvalidType(); 5242 ConvType = Proto->getResultType(); 5243 } 5244 5245 // C++ [class.conv.fct]p4: 5246 // The conversion-type-id shall not represent a function type nor 5247 // an array type. 5248 if (ConvType->isArrayType()) { 5249 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5250 ConvType = Context.getPointerType(ConvType); 5251 D.setInvalidType(); 5252 } else if (ConvType->isFunctionType()) { 5253 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5254 ConvType = Context.getPointerType(ConvType); 5255 D.setInvalidType(); 5256 } 5257 5258 // Rebuild the function type "R" without any parameters (in case any 5259 // of the errors above fired) and with the conversion type as the 5260 // return type. 5261 if (D.isInvalidType()) 5262 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5263 5264 // C++0x explicit conversion operators. 5265 if (D.getDeclSpec().isExplicitSpecified()) 5266 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5267 getLangOpts().CPlusPlus0x ? 5268 diag::warn_cxx98_compat_explicit_conversion_functions : 5269 diag::ext_explicit_conversion_functions) 5270 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5271} 5272 5273/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5274/// the declaration of the given C++ conversion function. This routine 5275/// is responsible for recording the conversion function in the C++ 5276/// class, if possible. 5277Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5278 assert(Conversion && "Expected to receive a conversion function declaration"); 5279 5280 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5281 5282 // Make sure we aren't redeclaring the conversion function. 5283 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5284 5285 // C++ [class.conv.fct]p1: 5286 // [...] A conversion function is never used to convert a 5287 // (possibly cv-qualified) object to the (possibly cv-qualified) 5288 // same object type (or a reference to it), to a (possibly 5289 // cv-qualified) base class of that type (or a reference to it), 5290 // or to (possibly cv-qualified) void. 5291 // FIXME: Suppress this warning if the conversion function ends up being a 5292 // virtual function that overrides a virtual function in a base class. 5293 QualType ClassType 5294 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5295 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5296 ConvType = ConvTypeRef->getPointeeType(); 5297 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5298 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5299 /* Suppress diagnostics for instantiations. */; 5300 else if (ConvType->isRecordType()) { 5301 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5302 if (ConvType == ClassType) 5303 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5304 << ClassType; 5305 else if (IsDerivedFrom(ClassType, ConvType)) 5306 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5307 << ClassType << ConvType; 5308 } else if (ConvType->isVoidType()) { 5309 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5310 << ClassType << ConvType; 5311 } 5312 5313 if (FunctionTemplateDecl *ConversionTemplate 5314 = Conversion->getDescribedFunctionTemplate()) 5315 return ConversionTemplate; 5316 5317 return Conversion; 5318} 5319 5320//===----------------------------------------------------------------------===// 5321// Namespace Handling 5322//===----------------------------------------------------------------------===// 5323 5324 5325 5326/// ActOnStartNamespaceDef - This is called at the start of a namespace 5327/// definition. 5328Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5329 SourceLocation InlineLoc, 5330 SourceLocation NamespaceLoc, 5331 SourceLocation IdentLoc, 5332 IdentifierInfo *II, 5333 SourceLocation LBrace, 5334 AttributeList *AttrList) { 5335 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5336 // For anonymous namespace, take the location of the left brace. 5337 SourceLocation Loc = II ? IdentLoc : LBrace; 5338 bool IsInline = InlineLoc.isValid(); 5339 bool IsInvalid = false; 5340 bool IsStd = false; 5341 bool AddToKnown = false; 5342 Scope *DeclRegionScope = NamespcScope->getParent(); 5343 5344 NamespaceDecl *PrevNS = 0; 5345 if (II) { 5346 // C++ [namespace.def]p2: 5347 // The identifier in an original-namespace-definition shall not 5348 // have been previously defined in the declarative region in 5349 // which the original-namespace-definition appears. The 5350 // identifier in an original-namespace-definition is the name of 5351 // the namespace. Subsequently in that declarative region, it is 5352 // treated as an original-namespace-name. 5353 // 5354 // Since namespace names are unique in their scope, and we don't 5355 // look through using directives, just look for any ordinary names. 5356 5357 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5358 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5359 Decl::IDNS_Namespace; 5360 NamedDecl *PrevDecl = 0; 5361 for (DeclContext::lookup_result R 5362 = CurContext->getRedeclContext()->lookup(II); 5363 R.first != R.second; ++R.first) { 5364 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5365 PrevDecl = *R.first; 5366 break; 5367 } 5368 } 5369 5370 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5371 5372 if (PrevNS) { 5373 // This is an extended namespace definition. 5374 if (IsInline != PrevNS->isInline()) { 5375 // inline-ness must match 5376 if (PrevNS->isInline()) { 5377 // The user probably just forgot the 'inline', so suggest that it 5378 // be added back. 5379 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5380 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5381 } else { 5382 Diag(Loc, diag::err_inline_namespace_mismatch) 5383 << IsInline; 5384 } 5385 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5386 5387 IsInline = PrevNS->isInline(); 5388 } 5389 } else if (PrevDecl) { 5390 // This is an invalid name redefinition. 5391 Diag(Loc, diag::err_redefinition_different_kind) 5392 << II; 5393 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5394 IsInvalid = true; 5395 // Continue on to push Namespc as current DeclContext and return it. 5396 } else if (II->isStr("std") && 5397 CurContext->getRedeclContext()->isTranslationUnit()) { 5398 // This is the first "real" definition of the namespace "std", so update 5399 // our cache of the "std" namespace to point at this definition. 5400 PrevNS = getStdNamespace(); 5401 IsStd = true; 5402 AddToKnown = !IsInline; 5403 } else { 5404 // We've seen this namespace for the first time. 5405 AddToKnown = !IsInline; 5406 } 5407 } else { 5408 // Anonymous namespaces. 5409 5410 // Determine whether the parent already has an anonymous namespace. 5411 DeclContext *Parent = CurContext->getRedeclContext(); 5412 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5413 PrevNS = TU->getAnonymousNamespace(); 5414 } else { 5415 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5416 PrevNS = ND->getAnonymousNamespace(); 5417 } 5418 5419 if (PrevNS && IsInline != PrevNS->isInline()) { 5420 // inline-ness must match 5421 Diag(Loc, diag::err_inline_namespace_mismatch) 5422 << IsInline; 5423 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5424 5425 // Recover by ignoring the new namespace's inline status. 5426 IsInline = PrevNS->isInline(); 5427 } 5428 } 5429 5430 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5431 StartLoc, Loc, II, PrevNS); 5432 if (IsInvalid) 5433 Namespc->setInvalidDecl(); 5434 5435 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5436 5437 // FIXME: Should we be merging attributes? 5438 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5439 PushNamespaceVisibilityAttr(Attr, Loc); 5440 5441 if (IsStd) 5442 StdNamespace = Namespc; 5443 if (AddToKnown) 5444 KnownNamespaces[Namespc] = false; 5445 5446 if (II) { 5447 PushOnScopeChains(Namespc, DeclRegionScope); 5448 } else { 5449 // Link the anonymous namespace into its parent. 5450 DeclContext *Parent = CurContext->getRedeclContext(); 5451 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5452 TU->setAnonymousNamespace(Namespc); 5453 } else { 5454 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5455 } 5456 5457 CurContext->addDecl(Namespc); 5458 5459 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5460 // behaves as if it were replaced by 5461 // namespace unique { /* empty body */ } 5462 // using namespace unique; 5463 // namespace unique { namespace-body } 5464 // where all occurrences of 'unique' in a translation unit are 5465 // replaced by the same identifier and this identifier differs 5466 // from all other identifiers in the entire program. 5467 5468 // We just create the namespace with an empty name and then add an 5469 // implicit using declaration, just like the standard suggests. 5470 // 5471 // CodeGen enforces the "universally unique" aspect by giving all 5472 // declarations semantically contained within an anonymous 5473 // namespace internal linkage. 5474 5475 if (!PrevNS) { 5476 UsingDirectiveDecl* UD 5477 = UsingDirectiveDecl::Create(Context, CurContext, 5478 /* 'using' */ LBrace, 5479 /* 'namespace' */ SourceLocation(), 5480 /* qualifier */ NestedNameSpecifierLoc(), 5481 /* identifier */ SourceLocation(), 5482 Namespc, 5483 /* Ancestor */ CurContext); 5484 UD->setImplicit(); 5485 CurContext->addDecl(UD); 5486 } 5487 } 5488 5489 ActOnDocumentableDecl(Namespc); 5490 5491 // Although we could have an invalid decl (i.e. the namespace name is a 5492 // redefinition), push it as current DeclContext and try to continue parsing. 5493 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5494 // for the namespace has the declarations that showed up in that particular 5495 // namespace definition. 5496 PushDeclContext(NamespcScope, Namespc); 5497 return Namespc; 5498} 5499 5500/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5501/// is a namespace alias, returns the namespace it points to. 5502static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5503 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5504 return AD->getNamespace(); 5505 return dyn_cast_or_null<NamespaceDecl>(D); 5506} 5507 5508/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5509/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5510void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5511 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5512 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5513 Namespc->setRBraceLoc(RBrace); 5514 PopDeclContext(); 5515 if (Namespc->hasAttr<VisibilityAttr>()) 5516 PopPragmaVisibility(true, RBrace); 5517} 5518 5519CXXRecordDecl *Sema::getStdBadAlloc() const { 5520 return cast_or_null<CXXRecordDecl>( 5521 StdBadAlloc.get(Context.getExternalSource())); 5522} 5523 5524NamespaceDecl *Sema::getStdNamespace() const { 5525 return cast_or_null<NamespaceDecl>( 5526 StdNamespace.get(Context.getExternalSource())); 5527} 5528 5529/// \brief Retrieve the special "std" namespace, which may require us to 5530/// implicitly define the namespace. 5531NamespaceDecl *Sema::getOrCreateStdNamespace() { 5532 if (!StdNamespace) { 5533 // The "std" namespace has not yet been defined, so build one implicitly. 5534 StdNamespace = NamespaceDecl::Create(Context, 5535 Context.getTranslationUnitDecl(), 5536 /*Inline=*/false, 5537 SourceLocation(), SourceLocation(), 5538 &PP.getIdentifierTable().get("std"), 5539 /*PrevDecl=*/0); 5540 getStdNamespace()->setImplicit(true); 5541 } 5542 5543 return getStdNamespace(); 5544} 5545 5546bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5547 assert(getLangOpts().CPlusPlus && 5548 "Looking for std::initializer_list outside of C++."); 5549 5550 // We're looking for implicit instantiations of 5551 // template <typename E> class std::initializer_list. 5552 5553 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5554 return false; 5555 5556 ClassTemplateDecl *Template = 0; 5557 const TemplateArgument *Arguments = 0; 5558 5559 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5560 5561 ClassTemplateSpecializationDecl *Specialization = 5562 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5563 if (!Specialization) 5564 return false; 5565 5566 Template = Specialization->getSpecializedTemplate(); 5567 Arguments = Specialization->getTemplateArgs().data(); 5568 } else if (const TemplateSpecializationType *TST = 5569 Ty->getAs<TemplateSpecializationType>()) { 5570 Template = dyn_cast_or_null<ClassTemplateDecl>( 5571 TST->getTemplateName().getAsTemplateDecl()); 5572 Arguments = TST->getArgs(); 5573 } 5574 if (!Template) 5575 return false; 5576 5577 if (!StdInitializerList) { 5578 // Haven't recognized std::initializer_list yet, maybe this is it. 5579 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5580 if (TemplateClass->getIdentifier() != 5581 &PP.getIdentifierTable().get("initializer_list") || 5582 !getStdNamespace()->InEnclosingNamespaceSetOf( 5583 TemplateClass->getDeclContext())) 5584 return false; 5585 // This is a template called std::initializer_list, but is it the right 5586 // template? 5587 TemplateParameterList *Params = Template->getTemplateParameters(); 5588 if (Params->getMinRequiredArguments() != 1) 5589 return false; 5590 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5591 return false; 5592 5593 // It's the right template. 5594 StdInitializerList = Template; 5595 } 5596 5597 if (Template != StdInitializerList) 5598 return false; 5599 5600 // This is an instance of std::initializer_list. Find the argument type. 5601 if (Element) 5602 *Element = Arguments[0].getAsType(); 5603 return true; 5604} 5605 5606static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5607 NamespaceDecl *Std = S.getStdNamespace(); 5608 if (!Std) { 5609 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5610 return 0; 5611 } 5612 5613 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5614 Loc, Sema::LookupOrdinaryName); 5615 if (!S.LookupQualifiedName(Result, Std)) { 5616 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5617 return 0; 5618 } 5619 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5620 if (!Template) { 5621 Result.suppressDiagnostics(); 5622 // We found something weird. Complain about the first thing we found. 5623 NamedDecl *Found = *Result.begin(); 5624 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5625 return 0; 5626 } 5627 5628 // We found some template called std::initializer_list. Now verify that it's 5629 // correct. 5630 TemplateParameterList *Params = Template->getTemplateParameters(); 5631 if (Params->getMinRequiredArguments() != 1 || 5632 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5633 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5634 return 0; 5635 } 5636 5637 return Template; 5638} 5639 5640QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5641 if (!StdInitializerList) { 5642 StdInitializerList = LookupStdInitializerList(*this, Loc); 5643 if (!StdInitializerList) 5644 return QualType(); 5645 } 5646 5647 TemplateArgumentListInfo Args(Loc, Loc); 5648 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5649 Context.getTrivialTypeSourceInfo(Element, 5650 Loc))); 5651 return Context.getCanonicalType( 5652 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5653} 5654 5655bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5656 // C++ [dcl.init.list]p2: 5657 // A constructor is an initializer-list constructor if its first parameter 5658 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5659 // std::initializer_list<E> for some type E, and either there are no other 5660 // parameters or else all other parameters have default arguments. 5661 if (Ctor->getNumParams() < 1 || 5662 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5663 return false; 5664 5665 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5666 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5667 ArgType = RT->getPointeeType().getUnqualifiedType(); 5668 5669 return isStdInitializerList(ArgType, 0); 5670} 5671 5672/// \brief Determine whether a using statement is in a context where it will be 5673/// apply in all contexts. 5674static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5675 switch (CurContext->getDeclKind()) { 5676 case Decl::TranslationUnit: 5677 return true; 5678 case Decl::LinkageSpec: 5679 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5680 default: 5681 return false; 5682 } 5683} 5684 5685namespace { 5686 5687// Callback to only accept typo corrections that are namespaces. 5688class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5689 public: 5690 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5691 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5692 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5693 } 5694 return false; 5695 } 5696}; 5697 5698} 5699 5700static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5701 CXXScopeSpec &SS, 5702 SourceLocation IdentLoc, 5703 IdentifierInfo *Ident) { 5704 NamespaceValidatorCCC Validator; 5705 R.clear(); 5706 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5707 R.getLookupKind(), Sc, &SS, 5708 Validator)) { 5709 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 5710 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 5711 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5712 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5713 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5714 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5715 else 5716 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5717 << Ident << CorrectedQuotedStr 5718 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5719 5720 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5721 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5722 5723 R.addDecl(Corrected.getCorrectionDecl()); 5724 return true; 5725 } 5726 return false; 5727} 5728 5729Decl *Sema::ActOnUsingDirective(Scope *S, 5730 SourceLocation UsingLoc, 5731 SourceLocation NamespcLoc, 5732 CXXScopeSpec &SS, 5733 SourceLocation IdentLoc, 5734 IdentifierInfo *NamespcName, 5735 AttributeList *AttrList) { 5736 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5737 assert(NamespcName && "Invalid NamespcName."); 5738 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5739 5740 // This can only happen along a recovery path. 5741 while (S->getFlags() & Scope::TemplateParamScope) 5742 S = S->getParent(); 5743 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5744 5745 UsingDirectiveDecl *UDir = 0; 5746 NestedNameSpecifier *Qualifier = 0; 5747 if (SS.isSet()) 5748 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5749 5750 // Lookup namespace name. 5751 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5752 LookupParsedName(R, S, &SS); 5753 if (R.isAmbiguous()) 5754 return 0; 5755 5756 if (R.empty()) { 5757 R.clear(); 5758 // Allow "using namespace std;" or "using namespace ::std;" even if 5759 // "std" hasn't been defined yet, for GCC compatibility. 5760 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5761 NamespcName->isStr("std")) { 5762 Diag(IdentLoc, diag::ext_using_undefined_std); 5763 R.addDecl(getOrCreateStdNamespace()); 5764 R.resolveKind(); 5765 } 5766 // Otherwise, attempt typo correction. 5767 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5768 } 5769 5770 if (!R.empty()) { 5771 NamedDecl *Named = R.getFoundDecl(); 5772 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5773 && "expected namespace decl"); 5774 // C++ [namespace.udir]p1: 5775 // A using-directive specifies that the names in the nominated 5776 // namespace can be used in the scope in which the 5777 // using-directive appears after the using-directive. During 5778 // unqualified name lookup (3.4.1), the names appear as if they 5779 // were declared in the nearest enclosing namespace which 5780 // contains both the using-directive and the nominated 5781 // namespace. [Note: in this context, "contains" means "contains 5782 // directly or indirectly". ] 5783 5784 // Find enclosing context containing both using-directive and 5785 // nominated namespace. 5786 NamespaceDecl *NS = getNamespaceDecl(Named); 5787 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5788 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5789 CommonAncestor = CommonAncestor->getParent(); 5790 5791 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5792 SS.getWithLocInContext(Context), 5793 IdentLoc, Named, CommonAncestor); 5794 5795 if (IsUsingDirectiveInToplevelContext(CurContext) && 5796 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5797 Diag(IdentLoc, diag::warn_using_directive_in_header); 5798 } 5799 5800 PushUsingDirective(S, UDir); 5801 } else { 5802 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5803 } 5804 5805 // FIXME: We ignore attributes for now. 5806 return UDir; 5807} 5808 5809void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5810 // If the scope has an associated entity and the using directive is at 5811 // namespace or translation unit scope, add the UsingDirectiveDecl into 5812 // its lookup structure so qualified name lookup can find it. 5813 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 5814 if (Ctx && !Ctx->isFunctionOrMethod()) 5815 Ctx->addDecl(UDir); 5816 else 5817 // Otherwise, it is at block sope. The using-directives will affect lookup 5818 // only to the end of the scope. 5819 S->PushUsingDirective(UDir); 5820} 5821 5822 5823Decl *Sema::ActOnUsingDeclaration(Scope *S, 5824 AccessSpecifier AS, 5825 bool HasUsingKeyword, 5826 SourceLocation UsingLoc, 5827 CXXScopeSpec &SS, 5828 UnqualifiedId &Name, 5829 AttributeList *AttrList, 5830 bool IsTypeName, 5831 SourceLocation TypenameLoc) { 5832 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5833 5834 switch (Name.getKind()) { 5835 case UnqualifiedId::IK_ImplicitSelfParam: 5836 case UnqualifiedId::IK_Identifier: 5837 case UnqualifiedId::IK_OperatorFunctionId: 5838 case UnqualifiedId::IK_LiteralOperatorId: 5839 case UnqualifiedId::IK_ConversionFunctionId: 5840 break; 5841 5842 case UnqualifiedId::IK_ConstructorName: 5843 case UnqualifiedId::IK_ConstructorTemplateId: 5844 // C++11 inheriting constructors. 5845 Diag(Name.getLocStart(), 5846 getLangOpts().CPlusPlus0x ? 5847 // FIXME: Produce warn_cxx98_compat_using_decl_constructor 5848 // instead once inheriting constructors work. 5849 diag::err_using_decl_constructor_unsupported : 5850 diag::err_using_decl_constructor) 5851 << SS.getRange(); 5852 5853 if (getLangOpts().CPlusPlus0x) break; 5854 5855 return 0; 5856 5857 case UnqualifiedId::IK_DestructorName: 5858 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 5859 << SS.getRange(); 5860 return 0; 5861 5862 case UnqualifiedId::IK_TemplateId: 5863 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 5864 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5865 return 0; 5866 } 5867 5868 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5869 DeclarationName TargetName = TargetNameInfo.getName(); 5870 if (!TargetName) 5871 return 0; 5872 5873 // Warn about using declarations. 5874 // TODO: store that the declaration was written without 'using' and 5875 // talk about access decls instead of using decls in the 5876 // diagnostics. 5877 if (!HasUsingKeyword) { 5878 UsingLoc = Name.getLocStart(); 5879 5880 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5881 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5882 } 5883 5884 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5885 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5886 return 0; 5887 5888 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5889 TargetNameInfo, AttrList, 5890 /* IsInstantiation */ false, 5891 IsTypeName, TypenameLoc); 5892 if (UD) 5893 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5894 5895 return UD; 5896} 5897 5898/// \brief Determine whether a using declaration considers the given 5899/// declarations as "equivalent", e.g., if they are redeclarations of 5900/// the same entity or are both typedefs of the same type. 5901static bool 5902IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5903 bool &SuppressRedeclaration) { 5904 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5905 SuppressRedeclaration = false; 5906 return true; 5907 } 5908 5909 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5910 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5911 SuppressRedeclaration = true; 5912 return Context.hasSameType(TD1->getUnderlyingType(), 5913 TD2->getUnderlyingType()); 5914 } 5915 5916 return false; 5917} 5918 5919 5920/// Determines whether to create a using shadow decl for a particular 5921/// decl, given the set of decls existing prior to this using lookup. 5922bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5923 const LookupResult &Previous) { 5924 // Diagnose finding a decl which is not from a base class of the 5925 // current class. We do this now because there are cases where this 5926 // function will silently decide not to build a shadow decl, which 5927 // will pre-empt further diagnostics. 5928 // 5929 // We don't need to do this in C++0x because we do the check once on 5930 // the qualifier. 5931 // 5932 // FIXME: diagnose the following if we care enough: 5933 // struct A { int foo; }; 5934 // struct B : A { using A::foo; }; 5935 // template <class T> struct C : A {}; 5936 // template <class T> struct D : C<T> { using B::foo; } // <--- 5937 // This is invalid (during instantiation) in C++03 because B::foo 5938 // resolves to the using decl in B, which is not a base class of D<T>. 5939 // We can't diagnose it immediately because C<T> is an unknown 5940 // specialization. The UsingShadowDecl in D<T> then points directly 5941 // to A::foo, which will look well-formed when we instantiate. 5942 // The right solution is to not collapse the shadow-decl chain. 5943 if (!getLangOpts().CPlusPlus0x && CurContext->isRecord()) { 5944 DeclContext *OrigDC = Orig->getDeclContext(); 5945 5946 // Handle enums and anonymous structs. 5947 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5948 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5949 while (OrigRec->isAnonymousStructOrUnion()) 5950 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5951 5952 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5953 if (OrigDC == CurContext) { 5954 Diag(Using->getLocation(), 5955 diag::err_using_decl_nested_name_specifier_is_current_class) 5956 << Using->getQualifierLoc().getSourceRange(); 5957 Diag(Orig->getLocation(), diag::note_using_decl_target); 5958 return true; 5959 } 5960 5961 Diag(Using->getQualifierLoc().getBeginLoc(), 5962 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5963 << Using->getQualifier() 5964 << cast<CXXRecordDecl>(CurContext) 5965 << Using->getQualifierLoc().getSourceRange(); 5966 Diag(Orig->getLocation(), diag::note_using_decl_target); 5967 return true; 5968 } 5969 } 5970 5971 if (Previous.empty()) return false; 5972 5973 NamedDecl *Target = Orig; 5974 if (isa<UsingShadowDecl>(Target)) 5975 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5976 5977 // If the target happens to be one of the previous declarations, we 5978 // don't have a conflict. 5979 // 5980 // FIXME: but we might be increasing its access, in which case we 5981 // should redeclare it. 5982 NamedDecl *NonTag = 0, *Tag = 0; 5983 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5984 I != E; ++I) { 5985 NamedDecl *D = (*I)->getUnderlyingDecl(); 5986 bool Result; 5987 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5988 return Result; 5989 5990 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5991 } 5992 5993 if (Target->isFunctionOrFunctionTemplate()) { 5994 FunctionDecl *FD; 5995 if (isa<FunctionTemplateDecl>(Target)) 5996 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5997 else 5998 FD = cast<FunctionDecl>(Target); 5999 6000 NamedDecl *OldDecl = 0; 6001 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6002 case Ovl_Overload: 6003 return false; 6004 6005 case Ovl_NonFunction: 6006 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6007 break; 6008 6009 // We found a decl with the exact signature. 6010 case Ovl_Match: 6011 // If we're in a record, we want to hide the target, so we 6012 // return true (without a diagnostic) to tell the caller not to 6013 // build a shadow decl. 6014 if (CurContext->isRecord()) 6015 return true; 6016 6017 // If we're not in a record, this is an error. 6018 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6019 break; 6020 } 6021 6022 Diag(Target->getLocation(), diag::note_using_decl_target); 6023 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6024 return true; 6025 } 6026 6027 // Target is not a function. 6028 6029 if (isa<TagDecl>(Target)) { 6030 // No conflict between a tag and a non-tag. 6031 if (!Tag) return false; 6032 6033 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6034 Diag(Target->getLocation(), diag::note_using_decl_target); 6035 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6036 return true; 6037 } 6038 6039 // No conflict between a tag and a non-tag. 6040 if (!NonTag) return false; 6041 6042 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6043 Diag(Target->getLocation(), diag::note_using_decl_target); 6044 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6045 return true; 6046} 6047 6048/// Builds a shadow declaration corresponding to a 'using' declaration. 6049UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6050 UsingDecl *UD, 6051 NamedDecl *Orig) { 6052 6053 // If we resolved to another shadow declaration, just coalesce them. 6054 NamedDecl *Target = Orig; 6055 if (isa<UsingShadowDecl>(Target)) { 6056 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6057 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6058 } 6059 6060 UsingShadowDecl *Shadow 6061 = UsingShadowDecl::Create(Context, CurContext, 6062 UD->getLocation(), UD, Target); 6063 UD->addShadowDecl(Shadow); 6064 6065 Shadow->setAccess(UD->getAccess()); 6066 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6067 Shadow->setInvalidDecl(); 6068 6069 if (S) 6070 PushOnScopeChains(Shadow, S); 6071 else 6072 CurContext->addDecl(Shadow); 6073 6074 6075 return Shadow; 6076} 6077 6078/// Hides a using shadow declaration. This is required by the current 6079/// using-decl implementation when a resolvable using declaration in a 6080/// class is followed by a declaration which would hide or override 6081/// one or more of the using decl's targets; for example: 6082/// 6083/// struct Base { void foo(int); }; 6084/// struct Derived : Base { 6085/// using Base::foo; 6086/// void foo(int); 6087/// }; 6088/// 6089/// The governing language is C++03 [namespace.udecl]p12: 6090/// 6091/// When a using-declaration brings names from a base class into a 6092/// derived class scope, member functions in the derived class 6093/// override and/or hide member functions with the same name and 6094/// parameter types in a base class (rather than conflicting). 6095/// 6096/// There are two ways to implement this: 6097/// (1) optimistically create shadow decls when they're not hidden 6098/// by existing declarations, or 6099/// (2) don't create any shadow decls (or at least don't make them 6100/// visible) until we've fully parsed/instantiated the class. 6101/// The problem with (1) is that we might have to retroactively remove 6102/// a shadow decl, which requires several O(n) operations because the 6103/// decl structures are (very reasonably) not designed for removal. 6104/// (2) avoids this but is very fiddly and phase-dependent. 6105void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6106 if (Shadow->getDeclName().getNameKind() == 6107 DeclarationName::CXXConversionFunctionName) 6108 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6109 6110 // Remove it from the DeclContext... 6111 Shadow->getDeclContext()->removeDecl(Shadow); 6112 6113 // ...and the scope, if applicable... 6114 if (S) { 6115 S->RemoveDecl(Shadow); 6116 IdResolver.RemoveDecl(Shadow); 6117 } 6118 6119 // ...and the using decl. 6120 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6121 6122 // TODO: complain somehow if Shadow was used. It shouldn't 6123 // be possible for this to happen, because...? 6124} 6125 6126/// Builds a using declaration. 6127/// 6128/// \param IsInstantiation - Whether this call arises from an 6129/// instantiation of an unresolved using declaration. We treat 6130/// the lookup differently for these declarations. 6131NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6132 SourceLocation UsingLoc, 6133 CXXScopeSpec &SS, 6134 const DeclarationNameInfo &NameInfo, 6135 AttributeList *AttrList, 6136 bool IsInstantiation, 6137 bool IsTypeName, 6138 SourceLocation TypenameLoc) { 6139 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6140 SourceLocation IdentLoc = NameInfo.getLoc(); 6141 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6142 6143 // FIXME: We ignore attributes for now. 6144 6145 if (SS.isEmpty()) { 6146 Diag(IdentLoc, diag::err_using_requires_qualname); 6147 return 0; 6148 } 6149 6150 // Do the redeclaration lookup in the current scope. 6151 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6152 ForRedeclaration); 6153 Previous.setHideTags(false); 6154 if (S) { 6155 LookupName(Previous, S); 6156 6157 // It is really dumb that we have to do this. 6158 LookupResult::Filter F = Previous.makeFilter(); 6159 while (F.hasNext()) { 6160 NamedDecl *D = F.next(); 6161 if (!isDeclInScope(D, CurContext, S)) 6162 F.erase(); 6163 } 6164 F.done(); 6165 } else { 6166 assert(IsInstantiation && "no scope in non-instantiation"); 6167 assert(CurContext->isRecord() && "scope not record in instantiation"); 6168 LookupQualifiedName(Previous, CurContext); 6169 } 6170 6171 // Check for invalid redeclarations. 6172 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6173 return 0; 6174 6175 // Check for bad qualifiers. 6176 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6177 return 0; 6178 6179 DeclContext *LookupContext = computeDeclContext(SS); 6180 NamedDecl *D; 6181 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6182 if (!LookupContext) { 6183 if (IsTypeName) { 6184 // FIXME: not all declaration name kinds are legal here 6185 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6186 UsingLoc, TypenameLoc, 6187 QualifierLoc, 6188 IdentLoc, NameInfo.getName()); 6189 } else { 6190 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6191 QualifierLoc, NameInfo); 6192 } 6193 } else { 6194 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6195 NameInfo, IsTypeName); 6196 } 6197 D->setAccess(AS); 6198 CurContext->addDecl(D); 6199 6200 if (!LookupContext) return D; 6201 UsingDecl *UD = cast<UsingDecl>(D); 6202 6203 if (RequireCompleteDeclContext(SS, LookupContext)) { 6204 UD->setInvalidDecl(); 6205 return UD; 6206 } 6207 6208 // The normal rules do not apply to inheriting constructor declarations. 6209 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6210 if (CheckInheritingConstructorUsingDecl(UD)) 6211 UD->setInvalidDecl(); 6212 return UD; 6213 } 6214 6215 // Otherwise, look up the target name. 6216 6217 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6218 6219 // Unlike most lookups, we don't always want to hide tag 6220 // declarations: tag names are visible through the using declaration 6221 // even if hidden by ordinary names, *except* in a dependent context 6222 // where it's important for the sanity of two-phase lookup. 6223 if (!IsInstantiation) 6224 R.setHideTags(false); 6225 6226 // For the purposes of this lookup, we have a base object type 6227 // equal to that of the current context. 6228 if (CurContext->isRecord()) { 6229 R.setBaseObjectType( 6230 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6231 } 6232 6233 LookupQualifiedName(R, LookupContext); 6234 6235 if (R.empty()) { 6236 Diag(IdentLoc, diag::err_no_member) 6237 << NameInfo.getName() << LookupContext << SS.getRange(); 6238 UD->setInvalidDecl(); 6239 return UD; 6240 } 6241 6242 if (R.isAmbiguous()) { 6243 UD->setInvalidDecl(); 6244 return UD; 6245 } 6246 6247 if (IsTypeName) { 6248 // If we asked for a typename and got a non-type decl, error out. 6249 if (!R.getAsSingle<TypeDecl>()) { 6250 Diag(IdentLoc, diag::err_using_typename_non_type); 6251 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6252 Diag((*I)->getUnderlyingDecl()->getLocation(), 6253 diag::note_using_decl_target); 6254 UD->setInvalidDecl(); 6255 return UD; 6256 } 6257 } else { 6258 // If we asked for a non-typename and we got a type, error out, 6259 // but only if this is an instantiation of an unresolved using 6260 // decl. Otherwise just silently find the type name. 6261 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6262 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6263 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6264 UD->setInvalidDecl(); 6265 return UD; 6266 } 6267 } 6268 6269 // C++0x N2914 [namespace.udecl]p6: 6270 // A using-declaration shall not name a namespace. 6271 if (R.getAsSingle<NamespaceDecl>()) { 6272 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6273 << SS.getRange(); 6274 UD->setInvalidDecl(); 6275 return UD; 6276 } 6277 6278 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6279 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6280 BuildUsingShadowDecl(S, UD, *I); 6281 } 6282 6283 return UD; 6284} 6285 6286/// Additional checks for a using declaration referring to a constructor name. 6287bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6288 assert(!UD->isTypeName() && "expecting a constructor name"); 6289 6290 const Type *SourceType = UD->getQualifier()->getAsType(); 6291 assert(SourceType && 6292 "Using decl naming constructor doesn't have type in scope spec."); 6293 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6294 6295 // Check whether the named type is a direct base class. 6296 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6297 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6298 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6299 BaseIt != BaseE; ++BaseIt) { 6300 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6301 if (CanonicalSourceType == BaseType) 6302 break; 6303 if (BaseIt->getType()->isDependentType()) 6304 break; 6305 } 6306 6307 if (BaseIt == BaseE) { 6308 // Did not find SourceType in the bases. 6309 Diag(UD->getUsingLocation(), 6310 diag::err_using_decl_constructor_not_in_direct_base) 6311 << UD->getNameInfo().getSourceRange() 6312 << QualType(SourceType, 0) << TargetClass; 6313 return true; 6314 } 6315 6316 if (!CurContext->isDependentContext()) 6317 BaseIt->setInheritConstructors(); 6318 6319 return false; 6320} 6321 6322/// Checks that the given using declaration is not an invalid 6323/// redeclaration. Note that this is checking only for the using decl 6324/// itself, not for any ill-formedness among the UsingShadowDecls. 6325bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6326 bool isTypeName, 6327 const CXXScopeSpec &SS, 6328 SourceLocation NameLoc, 6329 const LookupResult &Prev) { 6330 // C++03 [namespace.udecl]p8: 6331 // C++0x [namespace.udecl]p10: 6332 // A using-declaration is a declaration and can therefore be used 6333 // repeatedly where (and only where) multiple declarations are 6334 // allowed. 6335 // 6336 // That's in non-member contexts. 6337 if (!CurContext->getRedeclContext()->isRecord()) 6338 return false; 6339 6340 NestedNameSpecifier *Qual 6341 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6342 6343 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6344 NamedDecl *D = *I; 6345 6346 bool DTypename; 6347 NestedNameSpecifier *DQual; 6348 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6349 DTypename = UD->isTypeName(); 6350 DQual = UD->getQualifier(); 6351 } else if (UnresolvedUsingValueDecl *UD 6352 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6353 DTypename = false; 6354 DQual = UD->getQualifier(); 6355 } else if (UnresolvedUsingTypenameDecl *UD 6356 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6357 DTypename = true; 6358 DQual = UD->getQualifier(); 6359 } else continue; 6360 6361 // using decls differ if one says 'typename' and the other doesn't. 6362 // FIXME: non-dependent using decls? 6363 if (isTypeName != DTypename) continue; 6364 6365 // using decls differ if they name different scopes (but note that 6366 // template instantiation can cause this check to trigger when it 6367 // didn't before instantiation). 6368 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6369 Context.getCanonicalNestedNameSpecifier(DQual)) 6370 continue; 6371 6372 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6373 Diag(D->getLocation(), diag::note_using_decl) << 1; 6374 return true; 6375 } 6376 6377 return false; 6378} 6379 6380 6381/// Checks that the given nested-name qualifier used in a using decl 6382/// in the current context is appropriately related to the current 6383/// scope. If an error is found, diagnoses it and returns true. 6384bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6385 const CXXScopeSpec &SS, 6386 SourceLocation NameLoc) { 6387 DeclContext *NamedContext = computeDeclContext(SS); 6388 6389 if (!CurContext->isRecord()) { 6390 // C++03 [namespace.udecl]p3: 6391 // C++0x [namespace.udecl]p8: 6392 // A using-declaration for a class member shall be a member-declaration. 6393 6394 // If we weren't able to compute a valid scope, it must be a 6395 // dependent class scope. 6396 if (!NamedContext || NamedContext->isRecord()) { 6397 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6398 << SS.getRange(); 6399 return true; 6400 } 6401 6402 // Otherwise, everything is known to be fine. 6403 return false; 6404 } 6405 6406 // The current scope is a record. 6407 6408 // If the named context is dependent, we can't decide much. 6409 if (!NamedContext) { 6410 // FIXME: in C++0x, we can diagnose if we can prove that the 6411 // nested-name-specifier does not refer to a base class, which is 6412 // still possible in some cases. 6413 6414 // Otherwise we have to conservatively report that things might be 6415 // okay. 6416 return false; 6417 } 6418 6419 if (!NamedContext->isRecord()) { 6420 // Ideally this would point at the last name in the specifier, 6421 // but we don't have that level of source info. 6422 Diag(SS.getRange().getBegin(), 6423 diag::err_using_decl_nested_name_specifier_is_not_class) 6424 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6425 return true; 6426 } 6427 6428 if (!NamedContext->isDependentContext() && 6429 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6430 return true; 6431 6432 if (getLangOpts().CPlusPlus0x) { 6433 // C++0x [namespace.udecl]p3: 6434 // In a using-declaration used as a member-declaration, the 6435 // nested-name-specifier shall name a base class of the class 6436 // being defined. 6437 6438 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6439 cast<CXXRecordDecl>(NamedContext))) { 6440 if (CurContext == NamedContext) { 6441 Diag(NameLoc, 6442 diag::err_using_decl_nested_name_specifier_is_current_class) 6443 << SS.getRange(); 6444 return true; 6445 } 6446 6447 Diag(SS.getRange().getBegin(), 6448 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6449 << (NestedNameSpecifier*) SS.getScopeRep() 6450 << cast<CXXRecordDecl>(CurContext) 6451 << SS.getRange(); 6452 return true; 6453 } 6454 6455 return false; 6456 } 6457 6458 // C++03 [namespace.udecl]p4: 6459 // A using-declaration used as a member-declaration shall refer 6460 // to a member of a base class of the class being defined [etc.]. 6461 6462 // Salient point: SS doesn't have to name a base class as long as 6463 // lookup only finds members from base classes. Therefore we can 6464 // diagnose here only if we can prove that that can't happen, 6465 // i.e. if the class hierarchies provably don't intersect. 6466 6467 // TODO: it would be nice if "definitely valid" results were cached 6468 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6469 // need to be repeated. 6470 6471 struct UserData { 6472 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 6473 6474 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6475 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6476 Data->Bases.insert(Base); 6477 return true; 6478 } 6479 6480 bool hasDependentBases(const CXXRecordDecl *Class) { 6481 return !Class->forallBases(collect, this); 6482 } 6483 6484 /// Returns true if the base is dependent or is one of the 6485 /// accumulated base classes. 6486 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6487 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6488 return !Data->Bases.count(Base); 6489 } 6490 6491 bool mightShareBases(const CXXRecordDecl *Class) { 6492 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6493 } 6494 }; 6495 6496 UserData Data; 6497 6498 // Returns false if we find a dependent base. 6499 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6500 return false; 6501 6502 // Returns false if the class has a dependent base or if it or one 6503 // of its bases is present in the base set of the current context. 6504 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6505 return false; 6506 6507 Diag(SS.getRange().getBegin(), 6508 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6509 << (NestedNameSpecifier*) SS.getScopeRep() 6510 << cast<CXXRecordDecl>(CurContext) 6511 << SS.getRange(); 6512 6513 return true; 6514} 6515 6516Decl *Sema::ActOnAliasDeclaration(Scope *S, 6517 AccessSpecifier AS, 6518 MultiTemplateParamsArg TemplateParamLists, 6519 SourceLocation UsingLoc, 6520 UnqualifiedId &Name, 6521 TypeResult Type) { 6522 // Skip up to the relevant declaration scope. 6523 while (S->getFlags() & Scope::TemplateParamScope) 6524 S = S->getParent(); 6525 assert((S->getFlags() & Scope::DeclScope) && 6526 "got alias-declaration outside of declaration scope"); 6527 6528 if (Type.isInvalid()) 6529 return 0; 6530 6531 bool Invalid = false; 6532 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6533 TypeSourceInfo *TInfo = 0; 6534 GetTypeFromParser(Type.get(), &TInfo); 6535 6536 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6537 return 0; 6538 6539 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6540 UPPC_DeclarationType)) { 6541 Invalid = true; 6542 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6543 TInfo->getTypeLoc().getBeginLoc()); 6544 } 6545 6546 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6547 LookupName(Previous, S); 6548 6549 // Warn about shadowing the name of a template parameter. 6550 if (Previous.isSingleResult() && 6551 Previous.getFoundDecl()->isTemplateParameter()) { 6552 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6553 Previous.clear(); 6554 } 6555 6556 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6557 "name in alias declaration must be an identifier"); 6558 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6559 Name.StartLocation, 6560 Name.Identifier, TInfo); 6561 6562 NewTD->setAccess(AS); 6563 6564 if (Invalid) 6565 NewTD->setInvalidDecl(); 6566 6567 CheckTypedefForVariablyModifiedType(S, NewTD); 6568 Invalid |= NewTD->isInvalidDecl(); 6569 6570 bool Redeclaration = false; 6571 6572 NamedDecl *NewND; 6573 if (TemplateParamLists.size()) { 6574 TypeAliasTemplateDecl *OldDecl = 0; 6575 TemplateParameterList *OldTemplateParams = 0; 6576 6577 if (TemplateParamLists.size() != 1) { 6578 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6579 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6580 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6581 } 6582 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6583 6584 // Only consider previous declarations in the same scope. 6585 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6586 /*ExplicitInstantiationOrSpecialization*/false); 6587 if (!Previous.empty()) { 6588 Redeclaration = true; 6589 6590 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6591 if (!OldDecl && !Invalid) { 6592 Diag(UsingLoc, diag::err_redefinition_different_kind) 6593 << Name.Identifier; 6594 6595 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6596 if (OldD->getLocation().isValid()) 6597 Diag(OldD->getLocation(), diag::note_previous_definition); 6598 6599 Invalid = true; 6600 } 6601 6602 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6603 if (TemplateParameterListsAreEqual(TemplateParams, 6604 OldDecl->getTemplateParameters(), 6605 /*Complain=*/true, 6606 TPL_TemplateMatch)) 6607 OldTemplateParams = OldDecl->getTemplateParameters(); 6608 else 6609 Invalid = true; 6610 6611 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6612 if (!Invalid && 6613 !Context.hasSameType(OldTD->getUnderlyingType(), 6614 NewTD->getUnderlyingType())) { 6615 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6616 // but we can't reasonably accept it. 6617 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6618 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6619 if (OldTD->getLocation().isValid()) 6620 Diag(OldTD->getLocation(), diag::note_previous_definition); 6621 Invalid = true; 6622 } 6623 } 6624 } 6625 6626 // Merge any previous default template arguments into our parameters, 6627 // and check the parameter list. 6628 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6629 TPC_TypeAliasTemplate)) 6630 return 0; 6631 6632 TypeAliasTemplateDecl *NewDecl = 6633 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6634 Name.Identifier, TemplateParams, 6635 NewTD); 6636 6637 NewDecl->setAccess(AS); 6638 6639 if (Invalid) 6640 NewDecl->setInvalidDecl(); 6641 else if (OldDecl) 6642 NewDecl->setPreviousDeclaration(OldDecl); 6643 6644 NewND = NewDecl; 6645 } else { 6646 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6647 NewND = NewTD; 6648 } 6649 6650 if (!Redeclaration) 6651 PushOnScopeChains(NewND, S); 6652 6653 ActOnDocumentableDecl(NewND); 6654 return NewND; 6655} 6656 6657Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6658 SourceLocation NamespaceLoc, 6659 SourceLocation AliasLoc, 6660 IdentifierInfo *Alias, 6661 CXXScopeSpec &SS, 6662 SourceLocation IdentLoc, 6663 IdentifierInfo *Ident) { 6664 6665 // Lookup the namespace name. 6666 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6667 LookupParsedName(R, S, &SS); 6668 6669 // Check if we have a previous declaration with the same name. 6670 NamedDecl *PrevDecl 6671 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6672 ForRedeclaration); 6673 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6674 PrevDecl = 0; 6675 6676 if (PrevDecl) { 6677 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6678 // We already have an alias with the same name that points to the same 6679 // namespace, so don't create a new one. 6680 // FIXME: At some point, we'll want to create the (redundant) 6681 // declaration to maintain better source information. 6682 if (!R.isAmbiguous() && !R.empty() && 6683 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6684 return 0; 6685 } 6686 6687 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6688 diag::err_redefinition_different_kind; 6689 Diag(AliasLoc, DiagID) << Alias; 6690 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6691 return 0; 6692 } 6693 6694 if (R.isAmbiguous()) 6695 return 0; 6696 6697 if (R.empty()) { 6698 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6699 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6700 return 0; 6701 } 6702 } 6703 6704 NamespaceAliasDecl *AliasDecl = 6705 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6706 Alias, SS.getWithLocInContext(Context), 6707 IdentLoc, R.getFoundDecl()); 6708 6709 PushOnScopeChains(AliasDecl, S); 6710 return AliasDecl; 6711} 6712 6713namespace { 6714 /// \brief Scoped object used to handle the state changes required in Sema 6715 /// to implicitly define the body of a C++ member function; 6716 class ImplicitlyDefinedFunctionScope { 6717 Sema &S; 6718 Sema::ContextRAII SavedContext; 6719 6720 public: 6721 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6722 : S(S), SavedContext(S, Method) 6723 { 6724 S.PushFunctionScope(); 6725 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6726 } 6727 6728 ~ImplicitlyDefinedFunctionScope() { 6729 S.PopExpressionEvaluationContext(); 6730 S.PopFunctionScopeInfo(); 6731 } 6732 }; 6733} 6734 6735Sema::ImplicitExceptionSpecification 6736Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 6737 CXXMethodDecl *MD) { 6738 CXXRecordDecl *ClassDecl = MD->getParent(); 6739 6740 // C++ [except.spec]p14: 6741 // An implicitly declared special member function (Clause 12) shall have an 6742 // exception-specification. [...] 6743 ImplicitExceptionSpecification ExceptSpec(*this); 6744 if (ClassDecl->isInvalidDecl()) 6745 return ExceptSpec; 6746 6747 // Direct base-class constructors. 6748 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6749 BEnd = ClassDecl->bases_end(); 6750 B != BEnd; ++B) { 6751 if (B->isVirtual()) // Handled below. 6752 continue; 6753 6754 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6755 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6756 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6757 // If this is a deleted function, add it anyway. This might be conformant 6758 // with the standard. This might not. I'm not sure. It might not matter. 6759 if (Constructor) 6760 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6761 } 6762 } 6763 6764 // Virtual base-class constructors. 6765 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6766 BEnd = ClassDecl->vbases_end(); 6767 B != BEnd; ++B) { 6768 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6769 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6770 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6771 // If this is a deleted function, add it anyway. This might be conformant 6772 // with the standard. This might not. I'm not sure. It might not matter. 6773 if (Constructor) 6774 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6775 } 6776 } 6777 6778 // Field constructors. 6779 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6780 FEnd = ClassDecl->field_end(); 6781 F != FEnd; ++F) { 6782 if (F->hasInClassInitializer()) { 6783 if (Expr *E = F->getInClassInitializer()) 6784 ExceptSpec.CalledExpr(E); 6785 else if (!F->isInvalidDecl()) 6786 // DR1351: 6787 // If the brace-or-equal-initializer of a non-static data member 6788 // invokes a defaulted default constructor of its class or of an 6789 // enclosing class in a potentially evaluated subexpression, the 6790 // program is ill-formed. 6791 // 6792 // This resolution is unworkable: the exception specification of the 6793 // default constructor can be needed in an unevaluated context, in 6794 // particular, in the operand of a noexcept-expression, and we can be 6795 // unable to compute an exception specification for an enclosed class. 6796 // 6797 // We do not allow an in-class initializer to require the evaluation 6798 // of the exception specification for any in-class initializer whose 6799 // definition is not lexically complete. 6800 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 6801 } else if (const RecordType *RecordTy 6802 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6803 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6804 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6805 // If this is a deleted function, add it anyway. This might be conformant 6806 // with the standard. This might not. I'm not sure. It might not matter. 6807 // In particular, the problem is that this function never gets called. It 6808 // might just be ill-formed because this function attempts to refer to 6809 // a deleted function here. 6810 if (Constructor) 6811 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 6812 } 6813 } 6814 6815 return ExceptSpec; 6816} 6817 6818CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6819 CXXRecordDecl *ClassDecl) { 6820 // C++ [class.ctor]p5: 6821 // A default constructor for a class X is a constructor of class X 6822 // that can be called without an argument. If there is no 6823 // user-declared constructor for class X, a default constructor is 6824 // implicitly declared. An implicitly-declared default constructor 6825 // is an inline public member of its class. 6826 assert(!ClassDecl->hasUserDeclaredConstructor() && 6827 "Should not build implicit default constructor!"); 6828 6829 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 6830 CXXDefaultConstructor, 6831 false); 6832 6833 // Create the actual constructor declaration. 6834 CanQualType ClassType 6835 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6836 SourceLocation ClassLoc = ClassDecl->getLocation(); 6837 DeclarationName Name 6838 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6839 DeclarationNameInfo NameInfo(Name, ClassLoc); 6840 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6841 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 6842 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6843 Constexpr); 6844 DefaultCon->setAccess(AS_public); 6845 DefaultCon->setDefaulted(); 6846 DefaultCon->setImplicit(); 6847 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6848 6849 // Build an exception specification pointing back at this constructor. 6850 FunctionProtoType::ExtProtoInfo EPI; 6851 EPI.ExceptionSpecType = EST_Unevaluated; 6852 EPI.ExceptionSpecDecl = DefaultCon; 6853 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6854 6855 // Note that we have declared this constructor. 6856 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6857 6858 if (Scope *S = getScopeForContext(ClassDecl)) 6859 PushOnScopeChains(DefaultCon, S, false); 6860 ClassDecl->addDecl(DefaultCon); 6861 6862 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6863 DefaultCon->setDeletedAsWritten(); 6864 6865 return DefaultCon; 6866} 6867 6868void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6869 CXXConstructorDecl *Constructor) { 6870 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6871 !Constructor->doesThisDeclarationHaveABody() && 6872 !Constructor->isDeleted()) && 6873 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6874 6875 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6876 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6877 6878 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6879 DiagnosticErrorTrap Trap(Diags); 6880 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6881 Trap.hasErrorOccurred()) { 6882 Diag(CurrentLocation, diag::note_member_synthesized_at) 6883 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6884 Constructor->setInvalidDecl(); 6885 return; 6886 } 6887 6888 SourceLocation Loc = Constructor->getLocation(); 6889 Constructor->setBody(new (Context) CompoundStmt(Loc)); 6890 6891 Constructor->setUsed(); 6892 MarkVTableUsed(CurrentLocation, ClassDecl); 6893 6894 if (ASTMutationListener *L = getASTMutationListener()) { 6895 L->CompletedImplicitDefinition(Constructor); 6896 } 6897} 6898 6899void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6900 if (!D) return; 6901 AdjustDeclIfTemplate(D); 6902 6903 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6904 6905 if (!ClassDecl->isDependentType()) 6906 CheckExplicitlyDefaultedMethods(ClassDecl); 6907} 6908 6909void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6910 // We start with an initial pass over the base classes to collect those that 6911 // inherit constructors from. If there are none, we can forgo all further 6912 // processing. 6913 typedef SmallVector<const RecordType *, 4> BasesVector; 6914 BasesVector BasesToInheritFrom; 6915 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6916 BaseE = ClassDecl->bases_end(); 6917 BaseIt != BaseE; ++BaseIt) { 6918 if (BaseIt->getInheritConstructors()) { 6919 QualType Base = BaseIt->getType(); 6920 if (Base->isDependentType()) { 6921 // If we inherit constructors from anything that is dependent, just 6922 // abort processing altogether. We'll get another chance for the 6923 // instantiations. 6924 return; 6925 } 6926 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6927 } 6928 } 6929 if (BasesToInheritFrom.empty()) 6930 return; 6931 6932 // Now collect the constructors that we already have in the current class. 6933 // Those take precedence over inherited constructors. 6934 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6935 // unless there is a user-declared constructor with the same signature in 6936 // the class where the using-declaration appears. 6937 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6938 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6939 CtorE = ClassDecl->ctor_end(); 6940 CtorIt != CtorE; ++CtorIt) { 6941 ExistingConstructors.insert( 6942 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6943 } 6944 6945 DeclarationName CreatedCtorName = 6946 Context.DeclarationNames.getCXXConstructorName( 6947 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6948 6949 // Now comes the true work. 6950 // First, we keep a map from constructor types to the base that introduced 6951 // them. Needed for finding conflicting constructors. We also keep the 6952 // actually inserted declarations in there, for pretty diagnostics. 6953 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6954 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6955 ConstructorToSourceMap InheritedConstructors; 6956 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6957 BaseE = BasesToInheritFrom.end(); 6958 BaseIt != BaseE; ++BaseIt) { 6959 const RecordType *Base = *BaseIt; 6960 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6961 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6962 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6963 CtorE = BaseDecl->ctor_end(); 6964 CtorIt != CtorE; ++CtorIt) { 6965 // Find the using declaration for inheriting this base's constructors. 6966 // FIXME: Don't perform name lookup just to obtain a source location! 6967 DeclarationName Name = 6968 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6969 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 6970 LookupQualifiedName(Result, CurContext); 6971 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 6972 SourceLocation UsingLoc = UD ? UD->getLocation() : 6973 ClassDecl->getLocation(); 6974 6975 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6976 // from the class X named in the using-declaration consists of actual 6977 // constructors and notional constructors that result from the 6978 // transformation of defaulted parameters as follows: 6979 // - all non-template default constructors of X, and 6980 // - for each non-template constructor of X that has at least one 6981 // parameter with a default argument, the set of constructors that 6982 // results from omitting any ellipsis parameter specification and 6983 // successively omitting parameters with a default argument from the 6984 // end of the parameter-type-list. 6985 CXXConstructorDecl *BaseCtor = *CtorIt; 6986 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6987 const FunctionProtoType *BaseCtorType = 6988 BaseCtor->getType()->getAs<FunctionProtoType>(); 6989 6990 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6991 maxParams = BaseCtor->getNumParams(); 6992 params <= maxParams; ++params) { 6993 // Skip default constructors. They're never inherited. 6994 if (params == 0) 6995 continue; 6996 // Skip copy and move constructors for the same reason. 6997 if (CanBeCopyOrMove && params == 1) 6998 continue; 6999 7000 // Build up a function type for this particular constructor. 7001 // FIXME: The working paper does not consider that the exception spec 7002 // for the inheriting constructor might be larger than that of the 7003 // source. This code doesn't yet, either. When it does, this code will 7004 // need to be delayed until after exception specifications and in-class 7005 // member initializers are attached. 7006 const Type *NewCtorType; 7007 if (params == maxParams) 7008 NewCtorType = BaseCtorType; 7009 else { 7010 SmallVector<QualType, 16> Args; 7011 for (unsigned i = 0; i < params; ++i) { 7012 Args.push_back(BaseCtorType->getArgType(i)); 7013 } 7014 FunctionProtoType::ExtProtoInfo ExtInfo = 7015 BaseCtorType->getExtProtoInfo(); 7016 ExtInfo.Variadic = false; 7017 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7018 Args.data(), params, ExtInfo) 7019 .getTypePtr(); 7020 } 7021 const Type *CanonicalNewCtorType = 7022 Context.getCanonicalType(NewCtorType); 7023 7024 // Now that we have the type, first check if the class already has a 7025 // constructor with this signature. 7026 if (ExistingConstructors.count(CanonicalNewCtorType)) 7027 continue; 7028 7029 // Then we check if we have already declared an inherited constructor 7030 // with this signature. 7031 std::pair<ConstructorToSourceMap::iterator, bool> result = 7032 InheritedConstructors.insert(std::make_pair( 7033 CanonicalNewCtorType, 7034 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7035 if (!result.second) { 7036 // Already in the map. If it came from a different class, that's an 7037 // error. Not if it's from the same. 7038 CanQualType PreviousBase = result.first->second.first; 7039 if (CanonicalBase != PreviousBase) { 7040 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7041 const CXXConstructorDecl *PrevBaseCtor = 7042 PrevCtor->getInheritedConstructor(); 7043 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7044 7045 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7046 Diag(BaseCtor->getLocation(), 7047 diag::note_using_decl_constructor_conflict_current_ctor); 7048 Diag(PrevBaseCtor->getLocation(), 7049 diag::note_using_decl_constructor_conflict_previous_ctor); 7050 Diag(PrevCtor->getLocation(), 7051 diag::note_using_decl_constructor_conflict_previous_using); 7052 } 7053 continue; 7054 } 7055 7056 // OK, we're there, now add the constructor. 7057 // C++0x [class.inhctor]p8: [...] that would be performed by a 7058 // user-written inline constructor [...] 7059 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7060 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7061 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7062 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7063 /*ImplicitlyDeclared=*/true, 7064 // FIXME: Due to a defect in the standard, we treat inherited 7065 // constructors as constexpr even if that makes them ill-formed. 7066 /*Constexpr=*/BaseCtor->isConstexpr()); 7067 NewCtor->setAccess(BaseCtor->getAccess()); 7068 7069 // Build up the parameter decls and add them. 7070 SmallVector<ParmVarDecl *, 16> ParamDecls; 7071 for (unsigned i = 0; i < params; ++i) { 7072 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7073 UsingLoc, UsingLoc, 7074 /*IdentifierInfo=*/0, 7075 BaseCtorType->getArgType(i), 7076 /*TInfo=*/0, SC_None, 7077 SC_None, /*DefaultArg=*/0)); 7078 } 7079 NewCtor->setParams(ParamDecls); 7080 NewCtor->setInheritedConstructor(BaseCtor); 7081 7082 ClassDecl->addDecl(NewCtor); 7083 result.first->second.second = NewCtor; 7084 } 7085 } 7086 } 7087} 7088 7089Sema::ImplicitExceptionSpecification 7090Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 7091 CXXRecordDecl *ClassDecl = MD->getParent(); 7092 7093 // C++ [except.spec]p14: 7094 // An implicitly declared special member function (Clause 12) shall have 7095 // an exception-specification. 7096 ImplicitExceptionSpecification ExceptSpec(*this); 7097 if (ClassDecl->isInvalidDecl()) 7098 return ExceptSpec; 7099 7100 // Direct base-class destructors. 7101 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7102 BEnd = ClassDecl->bases_end(); 7103 B != BEnd; ++B) { 7104 if (B->isVirtual()) // Handled below. 7105 continue; 7106 7107 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7108 ExceptSpec.CalledDecl(B->getLocStart(), 7109 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7110 } 7111 7112 // Virtual base-class destructors. 7113 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7114 BEnd = ClassDecl->vbases_end(); 7115 B != BEnd; ++B) { 7116 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7117 ExceptSpec.CalledDecl(B->getLocStart(), 7118 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7119 } 7120 7121 // Field destructors. 7122 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7123 FEnd = ClassDecl->field_end(); 7124 F != FEnd; ++F) { 7125 if (const RecordType *RecordTy 7126 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7127 ExceptSpec.CalledDecl(F->getLocation(), 7128 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7129 } 7130 7131 return ExceptSpec; 7132} 7133 7134CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7135 // C++ [class.dtor]p2: 7136 // If a class has no user-declared destructor, a destructor is 7137 // declared implicitly. An implicitly-declared destructor is an 7138 // inline public member of its class. 7139 7140 // Create the actual destructor declaration. 7141 CanQualType ClassType 7142 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7143 SourceLocation ClassLoc = ClassDecl->getLocation(); 7144 DeclarationName Name 7145 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7146 DeclarationNameInfo NameInfo(Name, ClassLoc); 7147 CXXDestructorDecl *Destructor 7148 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7149 QualType(), 0, /*isInline=*/true, 7150 /*isImplicitlyDeclared=*/true); 7151 Destructor->setAccess(AS_public); 7152 Destructor->setDefaulted(); 7153 Destructor->setImplicit(); 7154 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7155 7156 // Build an exception specification pointing back at this destructor. 7157 FunctionProtoType::ExtProtoInfo EPI; 7158 EPI.ExceptionSpecType = EST_Unevaluated; 7159 EPI.ExceptionSpecDecl = Destructor; 7160 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7161 7162 // Note that we have declared this destructor. 7163 ++ASTContext::NumImplicitDestructorsDeclared; 7164 7165 // Introduce this destructor into its scope. 7166 if (Scope *S = getScopeForContext(ClassDecl)) 7167 PushOnScopeChains(Destructor, S, false); 7168 ClassDecl->addDecl(Destructor); 7169 7170 AddOverriddenMethods(ClassDecl, Destructor); 7171 7172 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7173 Destructor->setDeletedAsWritten(); 7174 7175 return Destructor; 7176} 7177 7178void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7179 CXXDestructorDecl *Destructor) { 7180 assert((Destructor->isDefaulted() && 7181 !Destructor->doesThisDeclarationHaveABody() && 7182 !Destructor->isDeleted()) && 7183 "DefineImplicitDestructor - call it for implicit default dtor"); 7184 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7185 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7186 7187 if (Destructor->isInvalidDecl()) 7188 return; 7189 7190 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7191 7192 DiagnosticErrorTrap Trap(Diags); 7193 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7194 Destructor->getParent()); 7195 7196 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7197 Diag(CurrentLocation, diag::note_member_synthesized_at) 7198 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7199 7200 Destructor->setInvalidDecl(); 7201 return; 7202 } 7203 7204 SourceLocation Loc = Destructor->getLocation(); 7205 Destructor->setBody(new (Context) CompoundStmt(Loc)); 7206 Destructor->setImplicitlyDefined(true); 7207 Destructor->setUsed(); 7208 MarkVTableUsed(CurrentLocation, ClassDecl); 7209 7210 if (ASTMutationListener *L = getASTMutationListener()) { 7211 L->CompletedImplicitDefinition(Destructor); 7212 } 7213} 7214 7215/// \brief Perform any semantic analysis which needs to be delayed until all 7216/// pending class member declarations have been parsed. 7217void Sema::ActOnFinishCXXMemberDecls() { 7218 // Perform any deferred checking of exception specifications for virtual 7219 // destructors. 7220 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 7221 i != e; ++i) { 7222 const CXXDestructorDecl *Dtor = 7223 DelayedDestructorExceptionSpecChecks[i].first; 7224 assert(!Dtor->getParent()->isDependentType() && 7225 "Should not ever add destructors of templates into the list."); 7226 CheckOverridingFunctionExceptionSpec(Dtor, 7227 DelayedDestructorExceptionSpecChecks[i].second); 7228 } 7229 DelayedDestructorExceptionSpecChecks.clear(); 7230} 7231 7232void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 7233 CXXDestructorDecl *Destructor) { 7234 assert(getLangOpts().CPlusPlus0x && 7235 "adjusting dtor exception specs was introduced in c++11"); 7236 7237 // C++11 [class.dtor]p3: 7238 // A declaration of a destructor that does not have an exception- 7239 // specification is implicitly considered to have the same exception- 7240 // specification as an implicit declaration. 7241 const FunctionProtoType *DtorType = Destructor->getType()-> 7242 getAs<FunctionProtoType>(); 7243 if (DtorType->hasExceptionSpec()) 7244 return; 7245 7246 // Replace the destructor's type, building off the existing one. Fortunately, 7247 // the only thing of interest in the destructor type is its extended info. 7248 // The return and arguments are fixed. 7249 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 7250 EPI.ExceptionSpecType = EST_Unevaluated; 7251 EPI.ExceptionSpecDecl = Destructor; 7252 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7253 7254 // FIXME: If the destructor has a body that could throw, and the newly created 7255 // spec doesn't allow exceptions, we should emit a warning, because this 7256 // change in behavior can break conforming C++03 programs at runtime. 7257 // However, we don't have a body or an exception specification yet, so it 7258 // needs to be done somewhere else. 7259} 7260 7261/// \brief Builds a statement that copies/moves the given entity from \p From to 7262/// \c To. 7263/// 7264/// This routine is used to copy/move the members of a class with an 7265/// implicitly-declared copy/move assignment operator. When the entities being 7266/// copied are arrays, this routine builds for loops to copy them. 7267/// 7268/// \param S The Sema object used for type-checking. 7269/// 7270/// \param Loc The location where the implicit copy/move is being generated. 7271/// 7272/// \param T The type of the expressions being copied/moved. Both expressions 7273/// must have this type. 7274/// 7275/// \param To The expression we are copying/moving to. 7276/// 7277/// \param From The expression we are copying/moving from. 7278/// 7279/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7280/// Otherwise, it's a non-static member subobject. 7281/// 7282/// \param Copying Whether we're copying or moving. 7283/// 7284/// \param Depth Internal parameter recording the depth of the recursion. 7285/// 7286/// \returns A statement or a loop that copies the expressions. 7287static StmtResult 7288BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7289 Expr *To, Expr *From, 7290 bool CopyingBaseSubobject, bool Copying, 7291 unsigned Depth = 0) { 7292 // C++0x [class.copy]p28: 7293 // Each subobject is assigned in the manner appropriate to its type: 7294 // 7295 // - if the subobject is of class type, as if by a call to operator= with 7296 // the subobject as the object expression and the corresponding 7297 // subobject of x as a single function argument (as if by explicit 7298 // qualification; that is, ignoring any possible virtual overriding 7299 // functions in more derived classes); 7300 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7301 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7302 7303 // Look for operator=. 7304 DeclarationName Name 7305 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7306 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7307 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7308 7309 // Filter out any result that isn't a copy/move-assignment operator. 7310 LookupResult::Filter F = OpLookup.makeFilter(); 7311 while (F.hasNext()) { 7312 NamedDecl *D = F.next(); 7313 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7314 if (Method->isCopyAssignmentOperator() || 7315 (!Copying && Method->isMoveAssignmentOperator())) 7316 continue; 7317 7318 F.erase(); 7319 } 7320 F.done(); 7321 7322 // Suppress the protected check (C++ [class.protected]) for each of the 7323 // assignment operators we found. This strange dance is required when 7324 // we're assigning via a base classes's copy-assignment operator. To 7325 // ensure that we're getting the right base class subobject (without 7326 // ambiguities), we need to cast "this" to that subobject type; to 7327 // ensure that we don't go through the virtual call mechanism, we need 7328 // to qualify the operator= name with the base class (see below). However, 7329 // this means that if the base class has a protected copy assignment 7330 // operator, the protected member access check will fail. So, we 7331 // rewrite "protected" access to "public" access in this case, since we 7332 // know by construction that we're calling from a derived class. 7333 if (CopyingBaseSubobject) { 7334 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7335 L != LEnd; ++L) { 7336 if (L.getAccess() == AS_protected) 7337 L.setAccess(AS_public); 7338 } 7339 } 7340 7341 // Create the nested-name-specifier that will be used to qualify the 7342 // reference to operator=; this is required to suppress the virtual 7343 // call mechanism. 7344 CXXScopeSpec SS; 7345 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7346 SS.MakeTrivial(S.Context, 7347 NestedNameSpecifier::Create(S.Context, 0, false, 7348 CanonicalT), 7349 Loc); 7350 7351 // Create the reference to operator=. 7352 ExprResult OpEqualRef 7353 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7354 /*TemplateKWLoc=*/SourceLocation(), 7355 /*FirstQualifierInScope=*/0, 7356 OpLookup, 7357 /*TemplateArgs=*/0, 7358 /*SuppressQualifierCheck=*/true); 7359 if (OpEqualRef.isInvalid()) 7360 return StmtError(); 7361 7362 // Build the call to the assignment operator. 7363 7364 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7365 OpEqualRef.takeAs<Expr>(), 7366 Loc, &From, 1, Loc); 7367 if (Call.isInvalid()) 7368 return StmtError(); 7369 7370 return S.Owned(Call.takeAs<Stmt>()); 7371 } 7372 7373 // - if the subobject is of scalar type, the built-in assignment 7374 // operator is used. 7375 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7376 if (!ArrayTy) { 7377 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7378 if (Assignment.isInvalid()) 7379 return StmtError(); 7380 7381 return S.Owned(Assignment.takeAs<Stmt>()); 7382 } 7383 7384 // - if the subobject is an array, each element is assigned, in the 7385 // manner appropriate to the element type; 7386 7387 // Construct a loop over the array bounds, e.g., 7388 // 7389 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7390 // 7391 // that will copy each of the array elements. 7392 QualType SizeType = S.Context.getSizeType(); 7393 7394 // Create the iteration variable. 7395 IdentifierInfo *IterationVarName = 0; 7396 { 7397 SmallString<8> Str; 7398 llvm::raw_svector_ostream OS(Str); 7399 OS << "__i" << Depth; 7400 IterationVarName = &S.Context.Idents.get(OS.str()); 7401 } 7402 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7403 IterationVarName, SizeType, 7404 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7405 SC_None, SC_None); 7406 7407 // Initialize the iteration variable to zero. 7408 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7409 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7410 7411 // Create a reference to the iteration variable; we'll use this several 7412 // times throughout. 7413 Expr *IterationVarRef 7414 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7415 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7416 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7417 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7418 7419 // Create the DeclStmt that holds the iteration variable. 7420 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7421 7422 // Create the comparison against the array bound. 7423 llvm::APInt Upper 7424 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7425 Expr *Comparison 7426 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7427 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7428 BO_NE, S.Context.BoolTy, 7429 VK_RValue, OK_Ordinary, Loc); 7430 7431 // Create the pre-increment of the iteration variable. 7432 Expr *Increment 7433 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7434 VK_LValue, OK_Ordinary, Loc); 7435 7436 // Subscript the "from" and "to" expressions with the iteration variable. 7437 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7438 IterationVarRefRVal, 7439 Loc)); 7440 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7441 IterationVarRefRVal, 7442 Loc)); 7443 if (!Copying) // Cast to rvalue 7444 From = CastForMoving(S, From); 7445 7446 // Build the copy/move for an individual element of the array. 7447 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7448 To, From, CopyingBaseSubobject, 7449 Copying, Depth + 1); 7450 if (Copy.isInvalid()) 7451 return StmtError(); 7452 7453 // Construct the loop that copies all elements of this array. 7454 return S.ActOnForStmt(Loc, Loc, InitStmt, 7455 S.MakeFullExpr(Comparison), 7456 0, S.MakeFullExpr(Increment), 7457 Loc, Copy.take()); 7458} 7459 7460/// Determine whether an implicit copy assignment operator for ClassDecl has a 7461/// const argument. 7462/// FIXME: It ought to be possible to store this on the record. 7463static bool isImplicitCopyAssignmentArgConst(Sema &S, 7464 CXXRecordDecl *ClassDecl) { 7465 if (ClassDecl->isInvalidDecl()) 7466 return true; 7467 7468 // C++ [class.copy]p10: 7469 // If the class definition does not explicitly declare a copy 7470 // assignment operator, one is declared implicitly. 7471 // The implicitly-defined copy assignment operator for a class X 7472 // will have the form 7473 // 7474 // X& X::operator=(const X&) 7475 // 7476 // if 7477 // -- each direct base class B of X has a copy assignment operator 7478 // whose parameter is of type const B&, const volatile B& or B, 7479 // and 7480 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7481 BaseEnd = ClassDecl->bases_end(); 7482 Base != BaseEnd; ++Base) { 7483 // We'll handle this below 7484 if (S.getLangOpts().CPlusPlus0x && Base->isVirtual()) 7485 continue; 7486 7487 assert(!Base->getType()->isDependentType() && 7488 "Cannot generate implicit members for class with dependent bases."); 7489 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7490 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0)) 7491 return false; 7492 } 7493 7494 // In C++11, the above citation has "or virtual" added 7495 if (S.getLangOpts().CPlusPlus0x) { 7496 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7497 BaseEnd = ClassDecl->vbases_end(); 7498 Base != BaseEnd; ++Base) { 7499 assert(!Base->getType()->isDependentType() && 7500 "Cannot generate implicit members for class with dependent bases."); 7501 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7502 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7503 false, 0)) 7504 return false; 7505 } 7506 } 7507 7508 // -- for all the nonstatic data members of X that are of a class 7509 // type M (or array thereof), each such class type has a copy 7510 // assignment operator whose parameter is of type const M&, 7511 // const volatile M& or M. 7512 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7513 FieldEnd = ClassDecl->field_end(); 7514 Field != FieldEnd; ++Field) { 7515 QualType FieldType = S.Context.getBaseElementType(Field->getType()); 7516 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) 7517 if (!S.LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, 7518 false, 0)) 7519 return false; 7520 } 7521 7522 // Otherwise, the implicitly declared copy assignment operator will 7523 // have the form 7524 // 7525 // X& X::operator=(X&) 7526 7527 return true; 7528} 7529 7530Sema::ImplicitExceptionSpecification 7531Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 7532 CXXRecordDecl *ClassDecl = MD->getParent(); 7533 7534 ImplicitExceptionSpecification ExceptSpec(*this); 7535 if (ClassDecl->isInvalidDecl()) 7536 return ExceptSpec; 7537 7538 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 7539 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 7540 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 7541 7542 // C++ [except.spec]p14: 7543 // An implicitly declared special member function (Clause 12) shall have an 7544 // exception-specification. [...] 7545 7546 // It is unspecified whether or not an implicit copy assignment operator 7547 // attempts to deduplicate calls to assignment operators of virtual bases are 7548 // made. As such, this exception specification is effectively unspecified. 7549 // Based on a similar decision made for constness in C++0x, we're erring on 7550 // the side of assuming such calls to be made regardless of whether they 7551 // actually happen. 7552 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7553 BaseEnd = ClassDecl->bases_end(); 7554 Base != BaseEnd; ++Base) { 7555 if (Base->isVirtual()) 7556 continue; 7557 7558 CXXRecordDecl *BaseClassDecl 7559 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7560 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7561 ArgQuals, false, 0)) 7562 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7563 } 7564 7565 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7566 BaseEnd = ClassDecl->vbases_end(); 7567 Base != BaseEnd; ++Base) { 7568 CXXRecordDecl *BaseClassDecl 7569 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7570 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7571 ArgQuals, false, 0)) 7572 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7573 } 7574 7575 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7576 FieldEnd = ClassDecl->field_end(); 7577 Field != FieldEnd; 7578 ++Field) { 7579 QualType FieldType = Context.getBaseElementType(Field->getType()); 7580 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7581 if (CXXMethodDecl *CopyAssign = 7582 LookupCopyingAssignment(FieldClassDecl, 7583 ArgQuals | FieldType.getCVRQualifiers(), 7584 false, 0)) 7585 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 7586 } 7587 } 7588 7589 return ExceptSpec; 7590} 7591 7592CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7593 // Note: The following rules are largely analoguous to the copy 7594 // constructor rules. Note that virtual bases are not taken into account 7595 // for determining the argument type of the operator. Note also that 7596 // operators taking an object instead of a reference are allowed. 7597 7598 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7599 QualType RetType = Context.getLValueReferenceType(ArgType); 7600 if (isImplicitCopyAssignmentArgConst(*this, ClassDecl)) 7601 ArgType = ArgType.withConst(); 7602 ArgType = Context.getLValueReferenceType(ArgType); 7603 7604 // An implicitly-declared copy assignment operator is an inline public 7605 // member of its class. 7606 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7607 SourceLocation ClassLoc = ClassDecl->getLocation(); 7608 DeclarationNameInfo NameInfo(Name, ClassLoc); 7609 CXXMethodDecl *CopyAssignment 7610 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 7611 /*TInfo=*/0, /*isStatic=*/false, 7612 /*StorageClassAsWritten=*/SC_None, 7613 /*isInline=*/true, /*isConstexpr=*/false, 7614 SourceLocation()); 7615 CopyAssignment->setAccess(AS_public); 7616 CopyAssignment->setDefaulted(); 7617 CopyAssignment->setImplicit(); 7618 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7619 7620 // Build an exception specification pointing back at this member. 7621 FunctionProtoType::ExtProtoInfo EPI; 7622 EPI.ExceptionSpecType = EST_Unevaluated; 7623 EPI.ExceptionSpecDecl = CopyAssignment; 7624 CopyAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 7625 7626 // Add the parameter to the operator. 7627 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7628 ClassLoc, ClassLoc, /*Id=*/0, 7629 ArgType, /*TInfo=*/0, 7630 SC_None, 7631 SC_None, 0); 7632 CopyAssignment->setParams(FromParam); 7633 7634 // Note that we have added this copy-assignment operator. 7635 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7636 7637 if (Scope *S = getScopeForContext(ClassDecl)) 7638 PushOnScopeChains(CopyAssignment, S, false); 7639 ClassDecl->addDecl(CopyAssignment); 7640 7641 // C++0x [class.copy]p19: 7642 // .... If the class definition does not explicitly declare a copy 7643 // assignment operator, there is no user-declared move constructor, and 7644 // there is no user-declared move assignment operator, a copy assignment 7645 // operator is implicitly declared as defaulted. 7646 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7647 CopyAssignment->setDeletedAsWritten(); 7648 7649 AddOverriddenMethods(ClassDecl, CopyAssignment); 7650 return CopyAssignment; 7651} 7652 7653void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7654 CXXMethodDecl *CopyAssignOperator) { 7655 assert((CopyAssignOperator->isDefaulted() && 7656 CopyAssignOperator->isOverloadedOperator() && 7657 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7658 !CopyAssignOperator->doesThisDeclarationHaveABody() && 7659 !CopyAssignOperator->isDeleted()) && 7660 "DefineImplicitCopyAssignment called for wrong function"); 7661 7662 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7663 7664 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7665 CopyAssignOperator->setInvalidDecl(); 7666 return; 7667 } 7668 7669 CopyAssignOperator->setUsed(); 7670 7671 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7672 DiagnosticErrorTrap Trap(Diags); 7673 7674 // C++0x [class.copy]p30: 7675 // The implicitly-defined or explicitly-defaulted copy assignment operator 7676 // for a non-union class X performs memberwise copy assignment of its 7677 // subobjects. The direct base classes of X are assigned first, in the 7678 // order of their declaration in the base-specifier-list, and then the 7679 // immediate non-static data members of X are assigned, in the order in 7680 // which they were declared in the class definition. 7681 7682 // The statements that form the synthesized function body. 7683 ASTOwningVector<Stmt*> Statements(*this); 7684 7685 // The parameter for the "other" object, which we are copying from. 7686 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7687 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7688 QualType OtherRefType = Other->getType(); 7689 if (const LValueReferenceType *OtherRef 7690 = OtherRefType->getAs<LValueReferenceType>()) { 7691 OtherRefType = OtherRef->getPointeeType(); 7692 OtherQuals = OtherRefType.getQualifiers(); 7693 } 7694 7695 // Our location for everything implicitly-generated. 7696 SourceLocation Loc = CopyAssignOperator->getLocation(); 7697 7698 // Construct a reference to the "other" object. We'll be using this 7699 // throughout the generated ASTs. 7700 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7701 assert(OtherRef && "Reference to parameter cannot fail!"); 7702 7703 // Construct the "this" pointer. We'll be using this throughout the generated 7704 // ASTs. 7705 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7706 assert(This && "Reference to this cannot fail!"); 7707 7708 // Assign base classes. 7709 bool Invalid = false; 7710 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7711 E = ClassDecl->bases_end(); Base != E; ++Base) { 7712 // Form the assignment: 7713 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7714 QualType BaseType = Base->getType().getUnqualifiedType(); 7715 if (!BaseType->isRecordType()) { 7716 Invalid = true; 7717 continue; 7718 } 7719 7720 CXXCastPath BasePath; 7721 BasePath.push_back(Base); 7722 7723 // Construct the "from" expression, which is an implicit cast to the 7724 // appropriately-qualified base type. 7725 Expr *From = OtherRef; 7726 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7727 CK_UncheckedDerivedToBase, 7728 VK_LValue, &BasePath).take(); 7729 7730 // Dereference "this". 7731 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7732 7733 // Implicitly cast "this" to the appropriately-qualified base type. 7734 To = ImpCastExprToType(To.take(), 7735 Context.getCVRQualifiedType(BaseType, 7736 CopyAssignOperator->getTypeQualifiers()), 7737 CK_UncheckedDerivedToBase, 7738 VK_LValue, &BasePath); 7739 7740 // Build the copy. 7741 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7742 To.get(), From, 7743 /*CopyingBaseSubobject=*/true, 7744 /*Copying=*/true); 7745 if (Copy.isInvalid()) { 7746 Diag(CurrentLocation, diag::note_member_synthesized_at) 7747 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7748 CopyAssignOperator->setInvalidDecl(); 7749 return; 7750 } 7751 7752 // Success! Record the copy. 7753 Statements.push_back(Copy.takeAs<Expr>()); 7754 } 7755 7756 // \brief Reference to the __builtin_memcpy function. 7757 Expr *BuiltinMemCpyRef = 0; 7758 // \brief Reference to the __builtin_objc_memmove_collectable function. 7759 Expr *CollectableMemCpyRef = 0; 7760 7761 // Assign non-static members. 7762 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7763 FieldEnd = ClassDecl->field_end(); 7764 Field != FieldEnd; ++Field) { 7765 if (Field->isUnnamedBitfield()) 7766 continue; 7767 7768 // Check for members of reference type; we can't copy those. 7769 if (Field->getType()->isReferenceType()) { 7770 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7771 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7772 Diag(Field->getLocation(), diag::note_declared_at); 7773 Diag(CurrentLocation, diag::note_member_synthesized_at) 7774 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7775 Invalid = true; 7776 continue; 7777 } 7778 7779 // Check for members of const-qualified, non-class type. 7780 QualType BaseType = Context.getBaseElementType(Field->getType()); 7781 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7782 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7783 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7784 Diag(Field->getLocation(), diag::note_declared_at); 7785 Diag(CurrentLocation, diag::note_member_synthesized_at) 7786 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7787 Invalid = true; 7788 continue; 7789 } 7790 7791 // Suppress assigning zero-width bitfields. 7792 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7793 continue; 7794 7795 QualType FieldType = Field->getType().getNonReferenceType(); 7796 if (FieldType->isIncompleteArrayType()) { 7797 assert(ClassDecl->hasFlexibleArrayMember() && 7798 "Incomplete array type is not valid"); 7799 continue; 7800 } 7801 7802 // Build references to the field in the object we're copying from and to. 7803 CXXScopeSpec SS; // Intentionally empty 7804 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7805 LookupMemberName); 7806 MemberLookup.addDecl(*Field); 7807 MemberLookup.resolveKind(); 7808 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7809 Loc, /*IsArrow=*/false, 7810 SS, SourceLocation(), 0, 7811 MemberLookup, 0); 7812 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7813 Loc, /*IsArrow=*/true, 7814 SS, SourceLocation(), 0, 7815 MemberLookup, 0); 7816 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7817 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7818 7819 // If the field should be copied with __builtin_memcpy rather than via 7820 // explicit assignments, do so. This optimization only applies for arrays 7821 // of scalars and arrays of class type with trivial copy-assignment 7822 // operators. 7823 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7824 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7825 // Compute the size of the memory buffer to be copied. 7826 QualType SizeType = Context.getSizeType(); 7827 llvm::APInt Size(Context.getTypeSize(SizeType), 7828 Context.getTypeSizeInChars(BaseType).getQuantity()); 7829 for (const ConstantArrayType *Array 7830 = Context.getAsConstantArrayType(FieldType); 7831 Array; 7832 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7833 llvm::APInt ArraySize 7834 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7835 Size *= ArraySize; 7836 } 7837 7838 // Take the address of the field references for "from" and "to". 7839 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7840 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7841 7842 bool NeedsCollectableMemCpy = 7843 (BaseType->isRecordType() && 7844 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7845 7846 if (NeedsCollectableMemCpy) { 7847 if (!CollectableMemCpyRef) { 7848 // Create a reference to the __builtin_objc_memmove_collectable function. 7849 LookupResult R(*this, 7850 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7851 Loc, LookupOrdinaryName); 7852 LookupName(R, TUScope, true); 7853 7854 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7855 if (!CollectableMemCpy) { 7856 // Something went horribly wrong earlier, and we will have 7857 // complained about it. 7858 Invalid = true; 7859 continue; 7860 } 7861 7862 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7863 CollectableMemCpy->getType(), 7864 VK_LValue, Loc, 0).take(); 7865 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7866 } 7867 } 7868 // Create a reference to the __builtin_memcpy builtin function. 7869 else if (!BuiltinMemCpyRef) { 7870 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7871 LookupOrdinaryName); 7872 LookupName(R, TUScope, true); 7873 7874 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7875 if (!BuiltinMemCpy) { 7876 // Something went horribly wrong earlier, and we will have complained 7877 // about it. 7878 Invalid = true; 7879 continue; 7880 } 7881 7882 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7883 BuiltinMemCpy->getType(), 7884 VK_LValue, Loc, 0).take(); 7885 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7886 } 7887 7888 ASTOwningVector<Expr*> CallArgs(*this); 7889 CallArgs.push_back(To.takeAs<Expr>()); 7890 CallArgs.push_back(From.takeAs<Expr>()); 7891 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7892 ExprResult Call = ExprError(); 7893 if (NeedsCollectableMemCpy) 7894 Call = ActOnCallExpr(/*Scope=*/0, 7895 CollectableMemCpyRef, 7896 Loc, move_arg(CallArgs), 7897 Loc); 7898 else 7899 Call = ActOnCallExpr(/*Scope=*/0, 7900 BuiltinMemCpyRef, 7901 Loc, move_arg(CallArgs), 7902 Loc); 7903 7904 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7905 Statements.push_back(Call.takeAs<Expr>()); 7906 continue; 7907 } 7908 7909 // Build the copy of this field. 7910 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7911 To.get(), From.get(), 7912 /*CopyingBaseSubobject=*/false, 7913 /*Copying=*/true); 7914 if (Copy.isInvalid()) { 7915 Diag(CurrentLocation, diag::note_member_synthesized_at) 7916 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7917 CopyAssignOperator->setInvalidDecl(); 7918 return; 7919 } 7920 7921 // Success! Record the copy. 7922 Statements.push_back(Copy.takeAs<Stmt>()); 7923 } 7924 7925 if (!Invalid) { 7926 // Add a "return *this;" 7927 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7928 7929 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7930 if (Return.isInvalid()) 7931 Invalid = true; 7932 else { 7933 Statements.push_back(Return.takeAs<Stmt>()); 7934 7935 if (Trap.hasErrorOccurred()) { 7936 Diag(CurrentLocation, diag::note_member_synthesized_at) 7937 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7938 Invalid = true; 7939 } 7940 } 7941 } 7942 7943 if (Invalid) { 7944 CopyAssignOperator->setInvalidDecl(); 7945 return; 7946 } 7947 7948 StmtResult Body; 7949 { 7950 CompoundScopeRAII CompoundScope(*this); 7951 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7952 /*isStmtExpr=*/false); 7953 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7954 } 7955 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7956 7957 if (ASTMutationListener *L = getASTMutationListener()) { 7958 L->CompletedImplicitDefinition(CopyAssignOperator); 7959 } 7960} 7961 7962Sema::ImplicitExceptionSpecification 7963Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 7964 CXXRecordDecl *ClassDecl = MD->getParent(); 7965 7966 ImplicitExceptionSpecification ExceptSpec(*this); 7967 if (ClassDecl->isInvalidDecl()) 7968 return ExceptSpec; 7969 7970 // C++0x [except.spec]p14: 7971 // An implicitly declared special member function (Clause 12) shall have an 7972 // exception-specification. [...] 7973 7974 // It is unspecified whether or not an implicit move assignment operator 7975 // attempts to deduplicate calls to assignment operators of virtual bases are 7976 // made. As such, this exception specification is effectively unspecified. 7977 // Based on a similar decision made for constness in C++0x, we're erring on 7978 // the side of assuming such calls to be made regardless of whether they 7979 // actually happen. 7980 // Note that a move constructor is not implicitly declared when there are 7981 // virtual bases, but it can still be user-declared and explicitly defaulted. 7982 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7983 BaseEnd = ClassDecl->bases_end(); 7984 Base != BaseEnd; ++Base) { 7985 if (Base->isVirtual()) 7986 continue; 7987 7988 CXXRecordDecl *BaseClassDecl 7989 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7990 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7991 0, false, 0)) 7992 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 7993 } 7994 7995 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7996 BaseEnd = ClassDecl->vbases_end(); 7997 Base != BaseEnd; ++Base) { 7998 CXXRecordDecl *BaseClassDecl 7999 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8000 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8001 0, false, 0)) 8002 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8003 } 8004 8005 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8006 FieldEnd = ClassDecl->field_end(); 8007 Field != FieldEnd; 8008 ++Field) { 8009 QualType FieldType = Context.getBaseElementType(Field->getType()); 8010 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8011 if (CXXMethodDecl *MoveAssign = 8012 LookupMovingAssignment(FieldClassDecl, 8013 FieldType.getCVRQualifiers(), 8014 false, 0)) 8015 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 8016 } 8017 } 8018 8019 return ExceptSpec; 8020} 8021 8022/// Determine whether the class type has any direct or indirect virtual base 8023/// classes which have a non-trivial move assignment operator. 8024static bool 8025hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 8026 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8027 BaseEnd = ClassDecl->vbases_end(); 8028 Base != BaseEnd; ++Base) { 8029 CXXRecordDecl *BaseClass = 8030 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8031 8032 // Try to declare the move assignment. If it would be deleted, then the 8033 // class does not have a non-trivial move assignment. 8034 if (BaseClass->needsImplicitMoveAssignment()) 8035 S.DeclareImplicitMoveAssignment(BaseClass); 8036 8037 // If the class has both a trivial move assignment and a non-trivial move 8038 // assignment, hasTrivialMoveAssignment() is false. 8039 if (BaseClass->hasDeclaredMoveAssignment() && 8040 !BaseClass->hasTrivialMoveAssignment()) 8041 return true; 8042 } 8043 8044 return false; 8045} 8046 8047/// Determine whether the given type either has a move constructor or is 8048/// trivially copyable. 8049static bool 8050hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8051 Type = S.Context.getBaseElementType(Type); 8052 8053 // FIXME: Technically, non-trivially-copyable non-class types, such as 8054 // reference types, are supposed to return false here, but that appears 8055 // to be a standard defect. 8056 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8057 if (!ClassDecl || !ClassDecl->getDefinition()) 8058 return true; 8059 8060 if (Type.isTriviallyCopyableType(S.Context)) 8061 return true; 8062 8063 if (IsConstructor) { 8064 if (ClassDecl->needsImplicitMoveConstructor()) 8065 S.DeclareImplicitMoveConstructor(ClassDecl); 8066 return ClassDecl->hasDeclaredMoveConstructor(); 8067 } 8068 8069 if (ClassDecl->needsImplicitMoveAssignment()) 8070 S.DeclareImplicitMoveAssignment(ClassDecl); 8071 return ClassDecl->hasDeclaredMoveAssignment(); 8072} 8073 8074/// Determine whether all non-static data members and direct or virtual bases 8075/// of class \p ClassDecl have either a move operation, or are trivially 8076/// copyable. 8077static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8078 bool IsConstructor) { 8079 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8080 BaseEnd = ClassDecl->bases_end(); 8081 Base != BaseEnd; ++Base) { 8082 if (Base->isVirtual()) 8083 continue; 8084 8085 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8086 return false; 8087 } 8088 8089 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8090 BaseEnd = ClassDecl->vbases_end(); 8091 Base != BaseEnd; ++Base) { 8092 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8093 return false; 8094 } 8095 8096 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8097 FieldEnd = ClassDecl->field_end(); 8098 Field != FieldEnd; ++Field) { 8099 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 8100 return false; 8101 } 8102 8103 return true; 8104} 8105 8106CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8107 // C++11 [class.copy]p20: 8108 // If the definition of a class X does not explicitly declare a move 8109 // assignment operator, one will be implicitly declared as defaulted 8110 // if and only if: 8111 // 8112 // - [first 4 bullets] 8113 assert(ClassDecl->needsImplicitMoveAssignment()); 8114 8115 // [Checked after we build the declaration] 8116 // - the move assignment operator would not be implicitly defined as 8117 // deleted, 8118 8119 // [DR1402]: 8120 // - X has no direct or indirect virtual base class with a non-trivial 8121 // move assignment operator, and 8122 // - each of X's non-static data members and direct or virtual base classes 8123 // has a type that either has a move assignment operator or is trivially 8124 // copyable. 8125 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8126 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8127 ClassDecl->setFailedImplicitMoveAssignment(); 8128 return 0; 8129 } 8130 8131 // Note: The following rules are largely analoguous to the move 8132 // constructor rules. 8133 8134 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8135 QualType RetType = Context.getLValueReferenceType(ArgType); 8136 ArgType = Context.getRValueReferenceType(ArgType); 8137 8138 // An implicitly-declared move assignment operator is an inline public 8139 // member of its class. 8140 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8141 SourceLocation ClassLoc = ClassDecl->getLocation(); 8142 DeclarationNameInfo NameInfo(Name, ClassLoc); 8143 CXXMethodDecl *MoveAssignment 8144 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8145 /*TInfo=*/0, /*isStatic=*/false, 8146 /*StorageClassAsWritten=*/SC_None, 8147 /*isInline=*/true, 8148 /*isConstexpr=*/false, 8149 SourceLocation()); 8150 MoveAssignment->setAccess(AS_public); 8151 MoveAssignment->setDefaulted(); 8152 MoveAssignment->setImplicit(); 8153 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8154 8155 // Build an exception specification pointing back at this member. 8156 FunctionProtoType::ExtProtoInfo EPI; 8157 EPI.ExceptionSpecType = EST_Unevaluated; 8158 EPI.ExceptionSpecDecl = MoveAssignment; 8159 MoveAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 8160 8161 // Add the parameter to the operator. 8162 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8163 ClassLoc, ClassLoc, /*Id=*/0, 8164 ArgType, /*TInfo=*/0, 8165 SC_None, 8166 SC_None, 0); 8167 MoveAssignment->setParams(FromParam); 8168 8169 // Note that we have added this copy-assignment operator. 8170 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8171 8172 // C++0x [class.copy]p9: 8173 // If the definition of a class X does not explicitly declare a move 8174 // assignment operator, one will be implicitly declared as defaulted if and 8175 // only if: 8176 // [...] 8177 // - the move assignment operator would not be implicitly defined as 8178 // deleted. 8179 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8180 // Cache this result so that we don't try to generate this over and over 8181 // on every lookup, leaking memory and wasting time. 8182 ClassDecl->setFailedImplicitMoveAssignment(); 8183 return 0; 8184 } 8185 8186 if (Scope *S = getScopeForContext(ClassDecl)) 8187 PushOnScopeChains(MoveAssignment, S, false); 8188 ClassDecl->addDecl(MoveAssignment); 8189 8190 AddOverriddenMethods(ClassDecl, MoveAssignment); 8191 return MoveAssignment; 8192} 8193 8194void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8195 CXXMethodDecl *MoveAssignOperator) { 8196 assert((MoveAssignOperator->isDefaulted() && 8197 MoveAssignOperator->isOverloadedOperator() && 8198 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8199 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8200 !MoveAssignOperator->isDeleted()) && 8201 "DefineImplicitMoveAssignment called for wrong function"); 8202 8203 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8204 8205 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8206 MoveAssignOperator->setInvalidDecl(); 8207 return; 8208 } 8209 8210 MoveAssignOperator->setUsed(); 8211 8212 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8213 DiagnosticErrorTrap Trap(Diags); 8214 8215 // C++0x [class.copy]p28: 8216 // The implicitly-defined or move assignment operator for a non-union class 8217 // X performs memberwise move assignment of its subobjects. The direct base 8218 // classes of X are assigned first, in the order of their declaration in the 8219 // base-specifier-list, and then the immediate non-static data members of X 8220 // are assigned, in the order in which they were declared in the class 8221 // definition. 8222 8223 // The statements that form the synthesized function body. 8224 ASTOwningVector<Stmt*> Statements(*this); 8225 8226 // The parameter for the "other" object, which we are move from. 8227 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8228 QualType OtherRefType = Other->getType()-> 8229 getAs<RValueReferenceType>()->getPointeeType(); 8230 assert(OtherRefType.getQualifiers() == 0 && 8231 "Bad argument type of defaulted move assignment"); 8232 8233 // Our location for everything implicitly-generated. 8234 SourceLocation Loc = MoveAssignOperator->getLocation(); 8235 8236 // Construct a reference to the "other" object. We'll be using this 8237 // throughout the generated ASTs. 8238 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8239 assert(OtherRef && "Reference to parameter cannot fail!"); 8240 // Cast to rvalue. 8241 OtherRef = CastForMoving(*this, OtherRef); 8242 8243 // Construct the "this" pointer. We'll be using this throughout the generated 8244 // ASTs. 8245 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8246 assert(This && "Reference to this cannot fail!"); 8247 8248 // Assign base classes. 8249 bool Invalid = false; 8250 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8251 E = ClassDecl->bases_end(); Base != E; ++Base) { 8252 // Form the assignment: 8253 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8254 QualType BaseType = Base->getType().getUnqualifiedType(); 8255 if (!BaseType->isRecordType()) { 8256 Invalid = true; 8257 continue; 8258 } 8259 8260 CXXCastPath BasePath; 8261 BasePath.push_back(Base); 8262 8263 // Construct the "from" expression, which is an implicit cast to the 8264 // appropriately-qualified base type. 8265 Expr *From = OtherRef; 8266 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8267 VK_XValue, &BasePath).take(); 8268 8269 // Dereference "this". 8270 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8271 8272 // Implicitly cast "this" to the appropriately-qualified base type. 8273 To = ImpCastExprToType(To.take(), 8274 Context.getCVRQualifiedType(BaseType, 8275 MoveAssignOperator->getTypeQualifiers()), 8276 CK_UncheckedDerivedToBase, 8277 VK_LValue, &BasePath); 8278 8279 // Build the move. 8280 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8281 To.get(), From, 8282 /*CopyingBaseSubobject=*/true, 8283 /*Copying=*/false); 8284 if (Move.isInvalid()) { 8285 Diag(CurrentLocation, diag::note_member_synthesized_at) 8286 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8287 MoveAssignOperator->setInvalidDecl(); 8288 return; 8289 } 8290 8291 // Success! Record the move. 8292 Statements.push_back(Move.takeAs<Expr>()); 8293 } 8294 8295 // \brief Reference to the __builtin_memcpy function. 8296 Expr *BuiltinMemCpyRef = 0; 8297 // \brief Reference to the __builtin_objc_memmove_collectable function. 8298 Expr *CollectableMemCpyRef = 0; 8299 8300 // Assign non-static members. 8301 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8302 FieldEnd = ClassDecl->field_end(); 8303 Field != FieldEnd; ++Field) { 8304 if (Field->isUnnamedBitfield()) 8305 continue; 8306 8307 // Check for members of reference type; we can't move those. 8308 if (Field->getType()->isReferenceType()) { 8309 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8310 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8311 Diag(Field->getLocation(), diag::note_declared_at); 8312 Diag(CurrentLocation, diag::note_member_synthesized_at) 8313 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8314 Invalid = true; 8315 continue; 8316 } 8317 8318 // Check for members of const-qualified, non-class type. 8319 QualType BaseType = Context.getBaseElementType(Field->getType()); 8320 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8321 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8322 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8323 Diag(Field->getLocation(), diag::note_declared_at); 8324 Diag(CurrentLocation, diag::note_member_synthesized_at) 8325 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8326 Invalid = true; 8327 continue; 8328 } 8329 8330 // Suppress assigning zero-width bitfields. 8331 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8332 continue; 8333 8334 QualType FieldType = Field->getType().getNonReferenceType(); 8335 if (FieldType->isIncompleteArrayType()) { 8336 assert(ClassDecl->hasFlexibleArrayMember() && 8337 "Incomplete array type is not valid"); 8338 continue; 8339 } 8340 8341 // Build references to the field in the object we're copying from and to. 8342 CXXScopeSpec SS; // Intentionally empty 8343 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8344 LookupMemberName); 8345 MemberLookup.addDecl(*Field); 8346 MemberLookup.resolveKind(); 8347 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8348 Loc, /*IsArrow=*/false, 8349 SS, SourceLocation(), 0, 8350 MemberLookup, 0); 8351 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8352 Loc, /*IsArrow=*/true, 8353 SS, SourceLocation(), 0, 8354 MemberLookup, 0); 8355 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8356 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8357 8358 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8359 "Member reference with rvalue base must be rvalue except for reference " 8360 "members, which aren't allowed for move assignment."); 8361 8362 // If the field should be copied with __builtin_memcpy rather than via 8363 // explicit assignments, do so. This optimization only applies for arrays 8364 // of scalars and arrays of class type with trivial move-assignment 8365 // operators. 8366 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8367 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8368 // Compute the size of the memory buffer to be copied. 8369 QualType SizeType = Context.getSizeType(); 8370 llvm::APInt Size(Context.getTypeSize(SizeType), 8371 Context.getTypeSizeInChars(BaseType).getQuantity()); 8372 for (const ConstantArrayType *Array 8373 = Context.getAsConstantArrayType(FieldType); 8374 Array; 8375 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8376 llvm::APInt ArraySize 8377 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8378 Size *= ArraySize; 8379 } 8380 8381 // Take the address of the field references for "from" and "to". We 8382 // directly construct UnaryOperators here because semantic analysis 8383 // does not permit us to take the address of an xvalue. 8384 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8385 Context.getPointerType(From.get()->getType()), 8386 VK_RValue, OK_Ordinary, Loc); 8387 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8388 Context.getPointerType(To.get()->getType()), 8389 VK_RValue, OK_Ordinary, Loc); 8390 8391 bool NeedsCollectableMemCpy = 8392 (BaseType->isRecordType() && 8393 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8394 8395 if (NeedsCollectableMemCpy) { 8396 if (!CollectableMemCpyRef) { 8397 // Create a reference to the __builtin_objc_memmove_collectable function. 8398 LookupResult R(*this, 8399 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8400 Loc, LookupOrdinaryName); 8401 LookupName(R, TUScope, true); 8402 8403 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8404 if (!CollectableMemCpy) { 8405 // Something went horribly wrong earlier, and we will have 8406 // complained about it. 8407 Invalid = true; 8408 continue; 8409 } 8410 8411 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8412 CollectableMemCpy->getType(), 8413 VK_LValue, Loc, 0).take(); 8414 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8415 } 8416 } 8417 // Create a reference to the __builtin_memcpy builtin function. 8418 else if (!BuiltinMemCpyRef) { 8419 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8420 LookupOrdinaryName); 8421 LookupName(R, TUScope, true); 8422 8423 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8424 if (!BuiltinMemCpy) { 8425 // Something went horribly wrong earlier, and we will have complained 8426 // about it. 8427 Invalid = true; 8428 continue; 8429 } 8430 8431 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8432 BuiltinMemCpy->getType(), 8433 VK_LValue, Loc, 0).take(); 8434 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8435 } 8436 8437 ASTOwningVector<Expr*> CallArgs(*this); 8438 CallArgs.push_back(To.takeAs<Expr>()); 8439 CallArgs.push_back(From.takeAs<Expr>()); 8440 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8441 ExprResult Call = ExprError(); 8442 if (NeedsCollectableMemCpy) 8443 Call = ActOnCallExpr(/*Scope=*/0, 8444 CollectableMemCpyRef, 8445 Loc, move_arg(CallArgs), 8446 Loc); 8447 else 8448 Call = ActOnCallExpr(/*Scope=*/0, 8449 BuiltinMemCpyRef, 8450 Loc, move_arg(CallArgs), 8451 Loc); 8452 8453 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8454 Statements.push_back(Call.takeAs<Expr>()); 8455 continue; 8456 } 8457 8458 // Build the move of this field. 8459 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8460 To.get(), From.get(), 8461 /*CopyingBaseSubobject=*/false, 8462 /*Copying=*/false); 8463 if (Move.isInvalid()) { 8464 Diag(CurrentLocation, diag::note_member_synthesized_at) 8465 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8466 MoveAssignOperator->setInvalidDecl(); 8467 return; 8468 } 8469 8470 // Success! Record the copy. 8471 Statements.push_back(Move.takeAs<Stmt>()); 8472 } 8473 8474 if (!Invalid) { 8475 // Add a "return *this;" 8476 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8477 8478 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8479 if (Return.isInvalid()) 8480 Invalid = true; 8481 else { 8482 Statements.push_back(Return.takeAs<Stmt>()); 8483 8484 if (Trap.hasErrorOccurred()) { 8485 Diag(CurrentLocation, diag::note_member_synthesized_at) 8486 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8487 Invalid = true; 8488 } 8489 } 8490 } 8491 8492 if (Invalid) { 8493 MoveAssignOperator->setInvalidDecl(); 8494 return; 8495 } 8496 8497 StmtResult Body; 8498 { 8499 CompoundScopeRAII CompoundScope(*this); 8500 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8501 /*isStmtExpr=*/false); 8502 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8503 } 8504 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8505 8506 if (ASTMutationListener *L = getASTMutationListener()) { 8507 L->CompletedImplicitDefinition(MoveAssignOperator); 8508 } 8509} 8510 8511/// Determine whether an implicit copy constructor for ClassDecl has a const 8512/// argument. 8513/// FIXME: It ought to be possible to store this on the record. 8514static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl) { 8515 if (ClassDecl->isInvalidDecl()) 8516 return true; 8517 8518 // C++ [class.copy]p5: 8519 // The implicitly-declared copy constructor for a class X will 8520 // have the form 8521 // 8522 // X::X(const X&) 8523 // 8524 // if 8525 // -- each direct or virtual base class B of X has a copy 8526 // constructor whose first parameter is of type const B& or 8527 // const volatile B&, and 8528 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8529 BaseEnd = ClassDecl->bases_end(); 8530 Base != BaseEnd; ++Base) { 8531 // Virtual bases are handled below. 8532 if (Base->isVirtual()) 8533 continue; 8534 8535 CXXRecordDecl *BaseClassDecl 8536 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8537 // FIXME: This lookup is wrong. If the copy ctor for a member or base is 8538 // ambiguous, we should still produce a constructor with a const-qualified 8539 // parameter. 8540 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const)) 8541 return false; 8542 } 8543 8544 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8545 BaseEnd = ClassDecl->vbases_end(); 8546 Base != BaseEnd; ++Base) { 8547 CXXRecordDecl *BaseClassDecl 8548 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8549 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const)) 8550 return false; 8551 } 8552 8553 // -- for all the nonstatic data members of X that are of a 8554 // class type M (or array thereof), each such class type 8555 // has a copy constructor whose first parameter is of type 8556 // const M& or const volatile M&. 8557 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8558 FieldEnd = ClassDecl->field_end(); 8559 Field != FieldEnd; ++Field) { 8560 QualType FieldType = S.Context.getBaseElementType(Field->getType()); 8561 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8562 if (!S.LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const)) 8563 return false; 8564 } 8565 } 8566 8567 // Otherwise, the implicitly declared copy constructor will have 8568 // the form 8569 // 8570 // X::X(X&) 8571 8572 return true; 8573} 8574 8575Sema::ImplicitExceptionSpecification 8576Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 8577 CXXRecordDecl *ClassDecl = MD->getParent(); 8578 8579 ImplicitExceptionSpecification ExceptSpec(*this); 8580 if (ClassDecl->isInvalidDecl()) 8581 return ExceptSpec; 8582 8583 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 8584 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 8585 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 8586 8587 // C++ [except.spec]p14: 8588 // An implicitly declared special member function (Clause 12) shall have an 8589 // exception-specification. [...] 8590 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8591 BaseEnd = ClassDecl->bases_end(); 8592 Base != BaseEnd; 8593 ++Base) { 8594 // Virtual bases are handled below. 8595 if (Base->isVirtual()) 8596 continue; 8597 8598 CXXRecordDecl *BaseClassDecl 8599 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8600 if (CXXConstructorDecl *CopyConstructor = 8601 LookupCopyingConstructor(BaseClassDecl, Quals)) 8602 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8603 } 8604 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8605 BaseEnd = ClassDecl->vbases_end(); 8606 Base != BaseEnd; 8607 ++Base) { 8608 CXXRecordDecl *BaseClassDecl 8609 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8610 if (CXXConstructorDecl *CopyConstructor = 8611 LookupCopyingConstructor(BaseClassDecl, Quals)) 8612 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8613 } 8614 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8615 FieldEnd = ClassDecl->field_end(); 8616 Field != FieldEnd; 8617 ++Field) { 8618 QualType FieldType = Context.getBaseElementType(Field->getType()); 8619 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8620 if (CXXConstructorDecl *CopyConstructor = 8621 LookupCopyingConstructor(FieldClassDecl, 8622 Quals | FieldType.getCVRQualifiers())) 8623 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 8624 } 8625 } 8626 8627 return ExceptSpec; 8628} 8629 8630CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8631 CXXRecordDecl *ClassDecl) { 8632 // C++ [class.copy]p4: 8633 // If the class definition does not explicitly declare a copy 8634 // constructor, one is declared implicitly. 8635 8636 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8637 QualType ArgType = ClassType; 8638 bool Const = isImplicitCopyCtorArgConst(*this, ClassDecl); 8639 if (Const) 8640 ArgType = ArgType.withConst(); 8641 ArgType = Context.getLValueReferenceType(ArgType); 8642 8643 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8644 CXXCopyConstructor, 8645 Const); 8646 8647 DeclarationName Name 8648 = Context.DeclarationNames.getCXXConstructorName( 8649 Context.getCanonicalType(ClassType)); 8650 SourceLocation ClassLoc = ClassDecl->getLocation(); 8651 DeclarationNameInfo NameInfo(Name, ClassLoc); 8652 8653 // An implicitly-declared copy constructor is an inline public 8654 // member of its class. 8655 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8656 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 8657 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8658 Constexpr); 8659 CopyConstructor->setAccess(AS_public); 8660 CopyConstructor->setDefaulted(); 8661 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8662 8663 // Build an exception specification pointing back at this member. 8664 FunctionProtoType::ExtProtoInfo EPI; 8665 EPI.ExceptionSpecType = EST_Unevaluated; 8666 EPI.ExceptionSpecDecl = CopyConstructor; 8667 CopyConstructor->setType( 8668 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 8669 8670 // Note that we have declared this constructor. 8671 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8672 8673 // Add the parameter to the constructor. 8674 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8675 ClassLoc, ClassLoc, 8676 /*IdentifierInfo=*/0, 8677 ArgType, /*TInfo=*/0, 8678 SC_None, 8679 SC_None, 0); 8680 CopyConstructor->setParams(FromParam); 8681 8682 if (Scope *S = getScopeForContext(ClassDecl)) 8683 PushOnScopeChains(CopyConstructor, S, false); 8684 ClassDecl->addDecl(CopyConstructor); 8685 8686 // C++11 [class.copy]p8: 8687 // ... If the class definition does not explicitly declare a copy 8688 // constructor, there is no user-declared move constructor, and there is no 8689 // user-declared move assignment operator, a copy constructor is implicitly 8690 // declared as defaulted. 8691 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8692 CopyConstructor->setDeletedAsWritten(); 8693 8694 return CopyConstructor; 8695} 8696 8697void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8698 CXXConstructorDecl *CopyConstructor) { 8699 assert((CopyConstructor->isDefaulted() && 8700 CopyConstructor->isCopyConstructor() && 8701 !CopyConstructor->doesThisDeclarationHaveABody() && 8702 !CopyConstructor->isDeleted()) && 8703 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8704 8705 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8706 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8707 8708 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8709 DiagnosticErrorTrap Trap(Diags); 8710 8711 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8712 Trap.hasErrorOccurred()) { 8713 Diag(CurrentLocation, diag::note_member_synthesized_at) 8714 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8715 CopyConstructor->setInvalidDecl(); 8716 } else { 8717 Sema::CompoundScopeRAII CompoundScope(*this); 8718 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8719 CopyConstructor->getLocation(), 8720 MultiStmtArg(*this, 0, 0), 8721 /*isStmtExpr=*/false) 8722 .takeAs<Stmt>()); 8723 CopyConstructor->setImplicitlyDefined(true); 8724 } 8725 8726 CopyConstructor->setUsed(); 8727 if (ASTMutationListener *L = getASTMutationListener()) { 8728 L->CompletedImplicitDefinition(CopyConstructor); 8729 } 8730} 8731 8732Sema::ImplicitExceptionSpecification 8733Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 8734 CXXRecordDecl *ClassDecl = MD->getParent(); 8735 8736 // C++ [except.spec]p14: 8737 // An implicitly declared special member function (Clause 12) shall have an 8738 // exception-specification. [...] 8739 ImplicitExceptionSpecification ExceptSpec(*this); 8740 if (ClassDecl->isInvalidDecl()) 8741 return ExceptSpec; 8742 8743 // Direct base-class constructors. 8744 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8745 BEnd = ClassDecl->bases_end(); 8746 B != BEnd; ++B) { 8747 if (B->isVirtual()) // Handled below. 8748 continue; 8749 8750 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8751 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8752 CXXConstructorDecl *Constructor = 8753 LookupMovingConstructor(BaseClassDecl, 0); 8754 // If this is a deleted function, add it anyway. This might be conformant 8755 // with the standard. This might not. I'm not sure. It might not matter. 8756 if (Constructor) 8757 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8758 } 8759 } 8760 8761 // Virtual base-class constructors. 8762 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8763 BEnd = ClassDecl->vbases_end(); 8764 B != BEnd; ++B) { 8765 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8766 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8767 CXXConstructorDecl *Constructor = 8768 LookupMovingConstructor(BaseClassDecl, 0); 8769 // If this is a deleted function, add it anyway. This might be conformant 8770 // with the standard. This might not. I'm not sure. It might not matter. 8771 if (Constructor) 8772 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8773 } 8774 } 8775 8776 // Field constructors. 8777 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8778 FEnd = ClassDecl->field_end(); 8779 F != FEnd; ++F) { 8780 QualType FieldType = Context.getBaseElementType(F->getType()); 8781 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 8782 CXXConstructorDecl *Constructor = 8783 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 8784 // If this is a deleted function, add it anyway. This might be conformant 8785 // with the standard. This might not. I'm not sure. It might not matter. 8786 // In particular, the problem is that this function never gets called. It 8787 // might just be ill-formed because this function attempts to refer to 8788 // a deleted function here. 8789 if (Constructor) 8790 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 8791 } 8792 } 8793 8794 return ExceptSpec; 8795} 8796 8797CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8798 CXXRecordDecl *ClassDecl) { 8799 // C++11 [class.copy]p9: 8800 // If the definition of a class X does not explicitly declare a move 8801 // constructor, one will be implicitly declared as defaulted if and only if: 8802 // 8803 // - [first 4 bullets] 8804 assert(ClassDecl->needsImplicitMoveConstructor()); 8805 8806 // [Checked after we build the declaration] 8807 // - the move assignment operator would not be implicitly defined as 8808 // deleted, 8809 8810 // [DR1402]: 8811 // - each of X's non-static data members and direct or virtual base classes 8812 // has a type that either has a move constructor or is trivially copyable. 8813 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 8814 ClassDecl->setFailedImplicitMoveConstructor(); 8815 return 0; 8816 } 8817 8818 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8819 QualType ArgType = Context.getRValueReferenceType(ClassType); 8820 8821 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8822 CXXMoveConstructor, 8823 false); 8824 8825 DeclarationName Name 8826 = Context.DeclarationNames.getCXXConstructorName( 8827 Context.getCanonicalType(ClassType)); 8828 SourceLocation ClassLoc = ClassDecl->getLocation(); 8829 DeclarationNameInfo NameInfo(Name, ClassLoc); 8830 8831 // C++0x [class.copy]p11: 8832 // An implicitly-declared copy/move constructor is an inline public 8833 // member of its class. 8834 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8835 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 8836 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8837 Constexpr); 8838 MoveConstructor->setAccess(AS_public); 8839 MoveConstructor->setDefaulted(); 8840 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8841 8842 // Build an exception specification pointing back at this member. 8843 FunctionProtoType::ExtProtoInfo EPI; 8844 EPI.ExceptionSpecType = EST_Unevaluated; 8845 EPI.ExceptionSpecDecl = MoveConstructor; 8846 MoveConstructor->setType( 8847 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 8848 8849 // Add the parameter to the constructor. 8850 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8851 ClassLoc, ClassLoc, 8852 /*IdentifierInfo=*/0, 8853 ArgType, /*TInfo=*/0, 8854 SC_None, 8855 SC_None, 0); 8856 MoveConstructor->setParams(FromParam); 8857 8858 // C++0x [class.copy]p9: 8859 // If the definition of a class X does not explicitly declare a move 8860 // constructor, one will be implicitly declared as defaulted if and only if: 8861 // [...] 8862 // - the move constructor would not be implicitly defined as deleted. 8863 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8864 // Cache this result so that we don't try to generate this over and over 8865 // on every lookup, leaking memory and wasting time. 8866 ClassDecl->setFailedImplicitMoveConstructor(); 8867 return 0; 8868 } 8869 8870 // Note that we have declared this constructor. 8871 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8872 8873 if (Scope *S = getScopeForContext(ClassDecl)) 8874 PushOnScopeChains(MoveConstructor, S, false); 8875 ClassDecl->addDecl(MoveConstructor); 8876 8877 return MoveConstructor; 8878} 8879 8880void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8881 CXXConstructorDecl *MoveConstructor) { 8882 assert((MoveConstructor->isDefaulted() && 8883 MoveConstructor->isMoveConstructor() && 8884 !MoveConstructor->doesThisDeclarationHaveABody() && 8885 !MoveConstructor->isDeleted()) && 8886 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8887 8888 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8889 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8890 8891 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8892 DiagnosticErrorTrap Trap(Diags); 8893 8894 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8895 Trap.hasErrorOccurred()) { 8896 Diag(CurrentLocation, diag::note_member_synthesized_at) 8897 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8898 MoveConstructor->setInvalidDecl(); 8899 } else { 8900 Sema::CompoundScopeRAII CompoundScope(*this); 8901 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8902 MoveConstructor->getLocation(), 8903 MultiStmtArg(*this, 0, 0), 8904 /*isStmtExpr=*/false) 8905 .takeAs<Stmt>()); 8906 MoveConstructor->setImplicitlyDefined(true); 8907 } 8908 8909 MoveConstructor->setUsed(); 8910 8911 if (ASTMutationListener *L = getASTMutationListener()) { 8912 L->CompletedImplicitDefinition(MoveConstructor); 8913 } 8914} 8915 8916bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 8917 return FD->isDeleted() && 8918 (FD->isDefaulted() || FD->isImplicit()) && 8919 isa<CXXMethodDecl>(FD); 8920} 8921 8922/// \brief Mark the call operator of the given lambda closure type as "used". 8923static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 8924 CXXMethodDecl *CallOperator 8925 = cast<CXXMethodDecl>( 8926 *Lambda->lookup( 8927 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8928 CallOperator->setReferenced(); 8929 CallOperator->setUsed(); 8930} 8931 8932void Sema::DefineImplicitLambdaToFunctionPointerConversion( 8933 SourceLocation CurrentLocation, 8934 CXXConversionDecl *Conv) 8935{ 8936 CXXRecordDecl *Lambda = Conv->getParent(); 8937 8938 // Make sure that the lambda call operator is marked used. 8939 markLambdaCallOperatorUsed(*this, Lambda); 8940 8941 Conv->setUsed(); 8942 8943 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8944 DiagnosticErrorTrap Trap(Diags); 8945 8946 // Return the address of the __invoke function. 8947 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 8948 CXXMethodDecl *Invoke 8949 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 8950 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 8951 VK_LValue, Conv->getLocation()).take(); 8952 assert(FunctionRef && "Can't refer to __invoke function?"); 8953 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 8954 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 8955 Conv->getLocation(), 8956 Conv->getLocation())); 8957 8958 // Fill in the __invoke function with a dummy implementation. IR generation 8959 // will fill in the actual details. 8960 Invoke->setUsed(); 8961 Invoke->setReferenced(); 8962 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation())); 8963 8964 if (ASTMutationListener *L = getASTMutationListener()) { 8965 L->CompletedImplicitDefinition(Conv); 8966 L->CompletedImplicitDefinition(Invoke); 8967 } 8968} 8969 8970void Sema::DefineImplicitLambdaToBlockPointerConversion( 8971 SourceLocation CurrentLocation, 8972 CXXConversionDecl *Conv) 8973{ 8974 Conv->setUsed(); 8975 8976 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8977 DiagnosticErrorTrap Trap(Diags); 8978 8979 // Copy-initialize the lambda object as needed to capture it. 8980 Expr *This = ActOnCXXThis(CurrentLocation).take(); 8981 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 8982 8983 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 8984 Conv->getLocation(), 8985 Conv, DerefThis); 8986 8987 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 8988 // behavior. Note that only the general conversion function does this 8989 // (since it's unusable otherwise); in the case where we inline the 8990 // block literal, it has block literal lifetime semantics. 8991 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 8992 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 8993 CK_CopyAndAutoreleaseBlockObject, 8994 BuildBlock.get(), 0, VK_RValue); 8995 8996 if (BuildBlock.isInvalid()) { 8997 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8998 Conv->setInvalidDecl(); 8999 return; 9000 } 9001 9002 // Create the return statement that returns the block from the conversion 9003 // function. 9004 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 9005 if (Return.isInvalid()) { 9006 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9007 Conv->setInvalidDecl(); 9008 return; 9009 } 9010 9011 // Set the body of the conversion function. 9012 Stmt *ReturnS = Return.take(); 9013 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 9014 Conv->getLocation(), 9015 Conv->getLocation())); 9016 9017 // We're done; notify the mutation listener, if any. 9018 if (ASTMutationListener *L = getASTMutationListener()) { 9019 L->CompletedImplicitDefinition(Conv); 9020 } 9021} 9022 9023/// \brief Determine whether the given list arguments contains exactly one 9024/// "real" (non-default) argument. 9025static bool hasOneRealArgument(MultiExprArg Args) { 9026 switch (Args.size()) { 9027 case 0: 9028 return false; 9029 9030 default: 9031 if (!Args.get()[1]->isDefaultArgument()) 9032 return false; 9033 9034 // fall through 9035 case 1: 9036 return !Args.get()[0]->isDefaultArgument(); 9037 } 9038 9039 return false; 9040} 9041 9042ExprResult 9043Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9044 CXXConstructorDecl *Constructor, 9045 MultiExprArg ExprArgs, 9046 bool HadMultipleCandidates, 9047 bool RequiresZeroInit, 9048 unsigned ConstructKind, 9049 SourceRange ParenRange) { 9050 bool Elidable = false; 9051 9052 // C++0x [class.copy]p34: 9053 // When certain criteria are met, an implementation is allowed to 9054 // omit the copy/move construction of a class object, even if the 9055 // copy/move constructor and/or destructor for the object have 9056 // side effects. [...] 9057 // - when a temporary class object that has not been bound to a 9058 // reference (12.2) would be copied/moved to a class object 9059 // with the same cv-unqualified type, the copy/move operation 9060 // can be omitted by constructing the temporary object 9061 // directly into the target of the omitted copy/move 9062 if (ConstructKind == CXXConstructExpr::CK_Complete && 9063 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9064 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 9065 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9066 } 9067 9068 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9069 Elidable, move(ExprArgs), HadMultipleCandidates, 9070 RequiresZeroInit, ConstructKind, ParenRange); 9071} 9072 9073/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9074/// including handling of its default argument expressions. 9075ExprResult 9076Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9077 CXXConstructorDecl *Constructor, bool Elidable, 9078 MultiExprArg ExprArgs, 9079 bool HadMultipleCandidates, 9080 bool RequiresZeroInit, 9081 unsigned ConstructKind, 9082 SourceRange ParenRange) { 9083 unsigned NumExprs = ExprArgs.size(); 9084 Expr **Exprs = (Expr **)ExprArgs.release(); 9085 9086 MarkFunctionReferenced(ConstructLoc, Constructor); 9087 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9088 Constructor, Elidable, Exprs, NumExprs, 9089 HadMultipleCandidates, /*FIXME*/false, 9090 RequiresZeroInit, 9091 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9092 ParenRange)); 9093} 9094 9095bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9096 CXXConstructorDecl *Constructor, 9097 MultiExprArg Exprs, 9098 bool HadMultipleCandidates) { 9099 // FIXME: Provide the correct paren SourceRange when available. 9100 ExprResult TempResult = 9101 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9102 move(Exprs), HadMultipleCandidates, false, 9103 CXXConstructExpr::CK_Complete, SourceRange()); 9104 if (TempResult.isInvalid()) 9105 return true; 9106 9107 Expr *Temp = TempResult.takeAs<Expr>(); 9108 CheckImplicitConversions(Temp, VD->getLocation()); 9109 MarkFunctionReferenced(VD->getLocation(), Constructor); 9110 Temp = MaybeCreateExprWithCleanups(Temp); 9111 VD->setInit(Temp); 9112 9113 return false; 9114} 9115 9116void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9117 if (VD->isInvalidDecl()) return; 9118 9119 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9120 if (ClassDecl->isInvalidDecl()) return; 9121 if (ClassDecl->hasIrrelevantDestructor()) return; 9122 if (ClassDecl->isDependentContext()) return; 9123 9124 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9125 MarkFunctionReferenced(VD->getLocation(), Destructor); 9126 CheckDestructorAccess(VD->getLocation(), Destructor, 9127 PDiag(diag::err_access_dtor_var) 9128 << VD->getDeclName() 9129 << VD->getType()); 9130 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9131 9132 if (!VD->hasGlobalStorage()) return; 9133 9134 // Emit warning for non-trivial dtor in global scope (a real global, 9135 // class-static, function-static). 9136 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9137 9138 // TODO: this should be re-enabled for static locals by !CXAAtExit 9139 if (!VD->isStaticLocal()) 9140 Diag(VD->getLocation(), diag::warn_global_destructor); 9141} 9142 9143/// \brief Given a constructor and the set of arguments provided for the 9144/// constructor, convert the arguments and add any required default arguments 9145/// to form a proper call to this constructor. 9146/// 9147/// \returns true if an error occurred, false otherwise. 9148bool 9149Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9150 MultiExprArg ArgsPtr, 9151 SourceLocation Loc, 9152 ASTOwningVector<Expr*> &ConvertedArgs, 9153 bool AllowExplicit) { 9154 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9155 unsigned NumArgs = ArgsPtr.size(); 9156 Expr **Args = (Expr **)ArgsPtr.get(); 9157 9158 const FunctionProtoType *Proto 9159 = Constructor->getType()->getAs<FunctionProtoType>(); 9160 assert(Proto && "Constructor without a prototype?"); 9161 unsigned NumArgsInProto = Proto->getNumArgs(); 9162 9163 // If too few arguments are available, we'll fill in the rest with defaults. 9164 if (NumArgs < NumArgsInProto) 9165 ConvertedArgs.reserve(NumArgsInProto); 9166 else 9167 ConvertedArgs.reserve(NumArgs); 9168 9169 VariadicCallType CallType = 9170 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9171 SmallVector<Expr *, 8> AllArgs; 9172 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9173 Proto, 0, Args, NumArgs, AllArgs, 9174 CallType, AllowExplicit); 9175 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9176 9177 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9178 9179 CheckConstructorCall(Constructor, AllArgs.data(), AllArgs.size(), 9180 Proto, Loc); 9181 9182 return Invalid; 9183} 9184 9185static inline bool 9186CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9187 const FunctionDecl *FnDecl) { 9188 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9189 if (isa<NamespaceDecl>(DC)) { 9190 return SemaRef.Diag(FnDecl->getLocation(), 9191 diag::err_operator_new_delete_declared_in_namespace) 9192 << FnDecl->getDeclName(); 9193 } 9194 9195 if (isa<TranslationUnitDecl>(DC) && 9196 FnDecl->getStorageClass() == SC_Static) { 9197 return SemaRef.Diag(FnDecl->getLocation(), 9198 diag::err_operator_new_delete_declared_static) 9199 << FnDecl->getDeclName(); 9200 } 9201 9202 return false; 9203} 9204 9205static inline bool 9206CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9207 CanQualType ExpectedResultType, 9208 CanQualType ExpectedFirstParamType, 9209 unsigned DependentParamTypeDiag, 9210 unsigned InvalidParamTypeDiag) { 9211 QualType ResultType = 9212 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9213 9214 // Check that the result type is not dependent. 9215 if (ResultType->isDependentType()) 9216 return SemaRef.Diag(FnDecl->getLocation(), 9217 diag::err_operator_new_delete_dependent_result_type) 9218 << FnDecl->getDeclName() << ExpectedResultType; 9219 9220 // Check that the result type is what we expect. 9221 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9222 return SemaRef.Diag(FnDecl->getLocation(), 9223 diag::err_operator_new_delete_invalid_result_type) 9224 << FnDecl->getDeclName() << ExpectedResultType; 9225 9226 // A function template must have at least 2 parameters. 9227 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9228 return SemaRef.Diag(FnDecl->getLocation(), 9229 diag::err_operator_new_delete_template_too_few_parameters) 9230 << FnDecl->getDeclName(); 9231 9232 // The function decl must have at least 1 parameter. 9233 if (FnDecl->getNumParams() == 0) 9234 return SemaRef.Diag(FnDecl->getLocation(), 9235 diag::err_operator_new_delete_too_few_parameters) 9236 << FnDecl->getDeclName(); 9237 9238 // Check the first parameter type is not dependent. 9239 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9240 if (FirstParamType->isDependentType()) 9241 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9242 << FnDecl->getDeclName() << ExpectedFirstParamType; 9243 9244 // Check that the first parameter type is what we expect. 9245 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9246 ExpectedFirstParamType) 9247 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9248 << FnDecl->getDeclName() << ExpectedFirstParamType; 9249 9250 return false; 9251} 9252 9253static bool 9254CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9255 // C++ [basic.stc.dynamic.allocation]p1: 9256 // A program is ill-formed if an allocation function is declared in a 9257 // namespace scope other than global scope or declared static in global 9258 // scope. 9259 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9260 return true; 9261 9262 CanQualType SizeTy = 9263 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9264 9265 // C++ [basic.stc.dynamic.allocation]p1: 9266 // The return type shall be void*. The first parameter shall have type 9267 // std::size_t. 9268 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9269 SizeTy, 9270 diag::err_operator_new_dependent_param_type, 9271 diag::err_operator_new_param_type)) 9272 return true; 9273 9274 // C++ [basic.stc.dynamic.allocation]p1: 9275 // The first parameter shall not have an associated default argument. 9276 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9277 return SemaRef.Diag(FnDecl->getLocation(), 9278 diag::err_operator_new_default_arg) 9279 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9280 9281 return false; 9282} 9283 9284static bool 9285CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9286 // C++ [basic.stc.dynamic.deallocation]p1: 9287 // A program is ill-formed if deallocation functions are declared in a 9288 // namespace scope other than global scope or declared static in global 9289 // scope. 9290 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9291 return true; 9292 9293 // C++ [basic.stc.dynamic.deallocation]p2: 9294 // Each deallocation function shall return void and its first parameter 9295 // shall be void*. 9296 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9297 SemaRef.Context.VoidPtrTy, 9298 diag::err_operator_delete_dependent_param_type, 9299 diag::err_operator_delete_param_type)) 9300 return true; 9301 9302 return false; 9303} 9304 9305/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9306/// of this overloaded operator is well-formed. If so, returns false; 9307/// otherwise, emits appropriate diagnostics and returns true. 9308bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9309 assert(FnDecl && FnDecl->isOverloadedOperator() && 9310 "Expected an overloaded operator declaration"); 9311 9312 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9313 9314 // C++ [over.oper]p5: 9315 // The allocation and deallocation functions, operator new, 9316 // operator new[], operator delete and operator delete[], are 9317 // described completely in 3.7.3. The attributes and restrictions 9318 // found in the rest of this subclause do not apply to them unless 9319 // explicitly stated in 3.7.3. 9320 if (Op == OO_Delete || Op == OO_Array_Delete) 9321 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9322 9323 if (Op == OO_New || Op == OO_Array_New) 9324 return CheckOperatorNewDeclaration(*this, FnDecl); 9325 9326 // C++ [over.oper]p6: 9327 // An operator function shall either be a non-static member 9328 // function or be a non-member function and have at least one 9329 // parameter whose type is a class, a reference to a class, an 9330 // enumeration, or a reference to an enumeration. 9331 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9332 if (MethodDecl->isStatic()) 9333 return Diag(FnDecl->getLocation(), 9334 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9335 } else { 9336 bool ClassOrEnumParam = false; 9337 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9338 ParamEnd = FnDecl->param_end(); 9339 Param != ParamEnd; ++Param) { 9340 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9341 if (ParamType->isDependentType() || ParamType->isRecordType() || 9342 ParamType->isEnumeralType()) { 9343 ClassOrEnumParam = true; 9344 break; 9345 } 9346 } 9347 9348 if (!ClassOrEnumParam) 9349 return Diag(FnDecl->getLocation(), 9350 diag::err_operator_overload_needs_class_or_enum) 9351 << FnDecl->getDeclName(); 9352 } 9353 9354 // C++ [over.oper]p8: 9355 // An operator function cannot have default arguments (8.3.6), 9356 // except where explicitly stated below. 9357 // 9358 // Only the function-call operator allows default arguments 9359 // (C++ [over.call]p1). 9360 if (Op != OO_Call) { 9361 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9362 Param != FnDecl->param_end(); ++Param) { 9363 if ((*Param)->hasDefaultArg()) 9364 return Diag((*Param)->getLocation(), 9365 diag::err_operator_overload_default_arg) 9366 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9367 } 9368 } 9369 9370 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9371 { false, false, false } 9372#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9373 , { Unary, Binary, MemberOnly } 9374#include "clang/Basic/OperatorKinds.def" 9375 }; 9376 9377 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9378 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9379 bool MustBeMemberOperator = OperatorUses[Op][2]; 9380 9381 // C++ [over.oper]p8: 9382 // [...] Operator functions cannot have more or fewer parameters 9383 // than the number required for the corresponding operator, as 9384 // described in the rest of this subclause. 9385 unsigned NumParams = FnDecl->getNumParams() 9386 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9387 if (Op != OO_Call && 9388 ((NumParams == 1 && !CanBeUnaryOperator) || 9389 (NumParams == 2 && !CanBeBinaryOperator) || 9390 (NumParams < 1) || (NumParams > 2))) { 9391 // We have the wrong number of parameters. 9392 unsigned ErrorKind; 9393 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9394 ErrorKind = 2; // 2 -> unary or binary. 9395 } else if (CanBeUnaryOperator) { 9396 ErrorKind = 0; // 0 -> unary 9397 } else { 9398 assert(CanBeBinaryOperator && 9399 "All non-call overloaded operators are unary or binary!"); 9400 ErrorKind = 1; // 1 -> binary 9401 } 9402 9403 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9404 << FnDecl->getDeclName() << NumParams << ErrorKind; 9405 } 9406 9407 // Overloaded operators other than operator() cannot be variadic. 9408 if (Op != OO_Call && 9409 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9410 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9411 << FnDecl->getDeclName(); 9412 } 9413 9414 // Some operators must be non-static member functions. 9415 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9416 return Diag(FnDecl->getLocation(), 9417 diag::err_operator_overload_must_be_member) 9418 << FnDecl->getDeclName(); 9419 } 9420 9421 // C++ [over.inc]p1: 9422 // The user-defined function called operator++ implements the 9423 // prefix and postfix ++ operator. If this function is a member 9424 // function with no parameters, or a non-member function with one 9425 // parameter of class or enumeration type, it defines the prefix 9426 // increment operator ++ for objects of that type. If the function 9427 // is a member function with one parameter (which shall be of type 9428 // int) or a non-member function with two parameters (the second 9429 // of which shall be of type int), it defines the postfix 9430 // increment operator ++ for objects of that type. 9431 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9432 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9433 bool ParamIsInt = false; 9434 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9435 ParamIsInt = BT->getKind() == BuiltinType::Int; 9436 9437 if (!ParamIsInt) 9438 return Diag(LastParam->getLocation(), 9439 diag::err_operator_overload_post_incdec_must_be_int) 9440 << LastParam->getType() << (Op == OO_MinusMinus); 9441 } 9442 9443 return false; 9444} 9445 9446/// CheckLiteralOperatorDeclaration - Check whether the declaration 9447/// of this literal operator function is well-formed. If so, returns 9448/// false; otherwise, emits appropriate diagnostics and returns true. 9449bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9450 if (isa<CXXMethodDecl>(FnDecl)) { 9451 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9452 << FnDecl->getDeclName(); 9453 return true; 9454 } 9455 9456 if (FnDecl->isExternC()) { 9457 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 9458 return true; 9459 } 9460 9461 bool Valid = false; 9462 9463 // This might be the definition of a literal operator template. 9464 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 9465 // This might be a specialization of a literal operator template. 9466 if (!TpDecl) 9467 TpDecl = FnDecl->getPrimaryTemplate(); 9468 9469 // template <char...> type operator "" name() is the only valid template 9470 // signature, and the only valid signature with no parameters. 9471 if (TpDecl) { 9472 if (FnDecl->param_size() == 0) { 9473 // Must have only one template parameter 9474 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9475 if (Params->size() == 1) { 9476 NonTypeTemplateParmDecl *PmDecl = 9477 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9478 9479 // The template parameter must be a char parameter pack. 9480 if (PmDecl && PmDecl->isTemplateParameterPack() && 9481 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9482 Valid = true; 9483 } 9484 } 9485 } else if (FnDecl->param_size()) { 9486 // Check the first parameter 9487 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9488 9489 QualType T = (*Param)->getType().getUnqualifiedType(); 9490 9491 // unsigned long long int, long double, and any character type are allowed 9492 // as the only parameters. 9493 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9494 Context.hasSameType(T, Context.LongDoubleTy) || 9495 Context.hasSameType(T, Context.CharTy) || 9496 Context.hasSameType(T, Context.WCharTy) || 9497 Context.hasSameType(T, Context.Char16Ty) || 9498 Context.hasSameType(T, Context.Char32Ty)) { 9499 if (++Param == FnDecl->param_end()) 9500 Valid = true; 9501 goto FinishedParams; 9502 } 9503 9504 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9505 const PointerType *PT = T->getAs<PointerType>(); 9506 if (!PT) 9507 goto FinishedParams; 9508 T = PT->getPointeeType(); 9509 if (!T.isConstQualified() || T.isVolatileQualified()) 9510 goto FinishedParams; 9511 T = T.getUnqualifiedType(); 9512 9513 // Move on to the second parameter; 9514 ++Param; 9515 9516 // If there is no second parameter, the first must be a const char * 9517 if (Param == FnDecl->param_end()) { 9518 if (Context.hasSameType(T, Context.CharTy)) 9519 Valid = true; 9520 goto FinishedParams; 9521 } 9522 9523 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9524 // are allowed as the first parameter to a two-parameter function 9525 if (!(Context.hasSameType(T, Context.CharTy) || 9526 Context.hasSameType(T, Context.WCharTy) || 9527 Context.hasSameType(T, Context.Char16Ty) || 9528 Context.hasSameType(T, Context.Char32Ty))) 9529 goto FinishedParams; 9530 9531 // The second and final parameter must be an std::size_t 9532 T = (*Param)->getType().getUnqualifiedType(); 9533 if (Context.hasSameType(T, Context.getSizeType()) && 9534 ++Param == FnDecl->param_end()) 9535 Valid = true; 9536 } 9537 9538 // FIXME: This diagnostic is absolutely terrible. 9539FinishedParams: 9540 if (!Valid) { 9541 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9542 << FnDecl->getDeclName(); 9543 return true; 9544 } 9545 9546 // A parameter-declaration-clause containing a default argument is not 9547 // equivalent to any of the permitted forms. 9548 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9549 ParamEnd = FnDecl->param_end(); 9550 Param != ParamEnd; ++Param) { 9551 if ((*Param)->hasDefaultArg()) { 9552 Diag((*Param)->getDefaultArgRange().getBegin(), 9553 diag::err_literal_operator_default_argument) 9554 << (*Param)->getDefaultArgRange(); 9555 break; 9556 } 9557 } 9558 9559 StringRef LiteralName 9560 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9561 if (LiteralName[0] != '_') { 9562 // C++11 [usrlit.suffix]p1: 9563 // Literal suffix identifiers that do not start with an underscore 9564 // are reserved for future standardization. 9565 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9566 } 9567 9568 return false; 9569} 9570 9571/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9572/// linkage specification, including the language and (if present) 9573/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9574/// the location of the language string literal, which is provided 9575/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9576/// the '{' brace. Otherwise, this linkage specification does not 9577/// have any braces. 9578Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9579 SourceLocation LangLoc, 9580 StringRef Lang, 9581 SourceLocation LBraceLoc) { 9582 LinkageSpecDecl::LanguageIDs Language; 9583 if (Lang == "\"C\"") 9584 Language = LinkageSpecDecl::lang_c; 9585 else if (Lang == "\"C++\"") 9586 Language = LinkageSpecDecl::lang_cxx; 9587 else { 9588 Diag(LangLoc, diag::err_bad_language); 9589 return 0; 9590 } 9591 9592 // FIXME: Add all the various semantics of linkage specifications 9593 9594 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9595 ExternLoc, LangLoc, Language); 9596 CurContext->addDecl(D); 9597 PushDeclContext(S, D); 9598 return D; 9599} 9600 9601/// ActOnFinishLinkageSpecification - Complete the definition of 9602/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9603/// valid, it's the position of the closing '}' brace in a linkage 9604/// specification that uses braces. 9605Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9606 Decl *LinkageSpec, 9607 SourceLocation RBraceLoc) { 9608 if (LinkageSpec) { 9609 if (RBraceLoc.isValid()) { 9610 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9611 LSDecl->setRBraceLoc(RBraceLoc); 9612 } 9613 PopDeclContext(); 9614 } 9615 return LinkageSpec; 9616} 9617 9618/// \brief Perform semantic analysis for the variable declaration that 9619/// occurs within a C++ catch clause, returning the newly-created 9620/// variable. 9621VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9622 TypeSourceInfo *TInfo, 9623 SourceLocation StartLoc, 9624 SourceLocation Loc, 9625 IdentifierInfo *Name) { 9626 bool Invalid = false; 9627 QualType ExDeclType = TInfo->getType(); 9628 9629 // Arrays and functions decay. 9630 if (ExDeclType->isArrayType()) 9631 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9632 else if (ExDeclType->isFunctionType()) 9633 ExDeclType = Context.getPointerType(ExDeclType); 9634 9635 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9636 // The exception-declaration shall not denote a pointer or reference to an 9637 // incomplete type, other than [cv] void*. 9638 // N2844 forbids rvalue references. 9639 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9640 Diag(Loc, diag::err_catch_rvalue_ref); 9641 Invalid = true; 9642 } 9643 9644 QualType BaseType = ExDeclType; 9645 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9646 unsigned DK = diag::err_catch_incomplete; 9647 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9648 BaseType = Ptr->getPointeeType(); 9649 Mode = 1; 9650 DK = diag::err_catch_incomplete_ptr; 9651 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9652 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9653 BaseType = Ref->getPointeeType(); 9654 Mode = 2; 9655 DK = diag::err_catch_incomplete_ref; 9656 } 9657 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9658 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9659 Invalid = true; 9660 9661 if (!Invalid && !ExDeclType->isDependentType() && 9662 RequireNonAbstractType(Loc, ExDeclType, 9663 diag::err_abstract_type_in_decl, 9664 AbstractVariableType)) 9665 Invalid = true; 9666 9667 // Only the non-fragile NeXT runtime currently supports C++ catches 9668 // of ObjC types, and no runtime supports catching ObjC types by value. 9669 if (!Invalid && getLangOpts().ObjC1) { 9670 QualType T = ExDeclType; 9671 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9672 T = RT->getPointeeType(); 9673 9674 if (T->isObjCObjectType()) { 9675 Diag(Loc, diag::err_objc_object_catch); 9676 Invalid = true; 9677 } else if (T->isObjCObjectPointerType()) { 9678 // FIXME: should this be a test for macosx-fragile specifically? 9679 if (getLangOpts().ObjCRuntime.isFragile()) 9680 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9681 } 9682 } 9683 9684 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9685 ExDeclType, TInfo, SC_None, SC_None); 9686 ExDecl->setExceptionVariable(true); 9687 9688 // In ARC, infer 'retaining' for variables of retainable type. 9689 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9690 Invalid = true; 9691 9692 if (!Invalid && !ExDeclType->isDependentType()) { 9693 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9694 // C++ [except.handle]p16: 9695 // The object declared in an exception-declaration or, if the 9696 // exception-declaration does not specify a name, a temporary (12.2) is 9697 // copy-initialized (8.5) from the exception object. [...] 9698 // The object is destroyed when the handler exits, after the destruction 9699 // of any automatic objects initialized within the handler. 9700 // 9701 // We just pretend to initialize the object with itself, then make sure 9702 // it can be destroyed later. 9703 QualType initType = ExDeclType; 9704 9705 InitializedEntity entity = 9706 InitializedEntity::InitializeVariable(ExDecl); 9707 InitializationKind initKind = 9708 InitializationKind::CreateCopy(Loc, SourceLocation()); 9709 9710 Expr *opaqueValue = 9711 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9712 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9713 ExprResult result = sequence.Perform(*this, entity, initKind, 9714 MultiExprArg(&opaqueValue, 1)); 9715 if (result.isInvalid()) 9716 Invalid = true; 9717 else { 9718 // If the constructor used was non-trivial, set this as the 9719 // "initializer". 9720 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9721 if (!construct->getConstructor()->isTrivial()) { 9722 Expr *init = MaybeCreateExprWithCleanups(construct); 9723 ExDecl->setInit(init); 9724 } 9725 9726 // And make sure it's destructable. 9727 FinalizeVarWithDestructor(ExDecl, recordType); 9728 } 9729 } 9730 } 9731 9732 if (Invalid) 9733 ExDecl->setInvalidDecl(); 9734 9735 return ExDecl; 9736} 9737 9738/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9739/// handler. 9740Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9741 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9742 bool Invalid = D.isInvalidType(); 9743 9744 // Check for unexpanded parameter packs. 9745 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9746 UPPC_ExceptionType)) { 9747 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9748 D.getIdentifierLoc()); 9749 Invalid = true; 9750 } 9751 9752 IdentifierInfo *II = D.getIdentifier(); 9753 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9754 LookupOrdinaryName, 9755 ForRedeclaration)) { 9756 // The scope should be freshly made just for us. There is just no way 9757 // it contains any previous declaration. 9758 assert(!S->isDeclScope(PrevDecl)); 9759 if (PrevDecl->isTemplateParameter()) { 9760 // Maybe we will complain about the shadowed template parameter. 9761 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9762 PrevDecl = 0; 9763 } 9764 } 9765 9766 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9767 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9768 << D.getCXXScopeSpec().getRange(); 9769 Invalid = true; 9770 } 9771 9772 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9773 D.getLocStart(), 9774 D.getIdentifierLoc(), 9775 D.getIdentifier()); 9776 if (Invalid) 9777 ExDecl->setInvalidDecl(); 9778 9779 // Add the exception declaration into this scope. 9780 if (II) 9781 PushOnScopeChains(ExDecl, S); 9782 else 9783 CurContext->addDecl(ExDecl); 9784 9785 ProcessDeclAttributes(S, ExDecl, D); 9786 return ExDecl; 9787} 9788 9789Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9790 Expr *AssertExpr, 9791 Expr *AssertMessageExpr, 9792 SourceLocation RParenLoc) { 9793 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 9794 9795 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9796 return 0; 9797 9798 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 9799 AssertMessage, RParenLoc, false); 9800} 9801 9802Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9803 Expr *AssertExpr, 9804 StringLiteral *AssertMessage, 9805 SourceLocation RParenLoc, 9806 bool Failed) { 9807 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 9808 !Failed) { 9809 // In a static_assert-declaration, the constant-expression shall be a 9810 // constant expression that can be contextually converted to bool. 9811 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9812 if (Converted.isInvalid()) 9813 Failed = true; 9814 9815 llvm::APSInt Cond; 9816 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 9817 diag::err_static_assert_expression_is_not_constant, 9818 /*AllowFold=*/false).isInvalid()) 9819 Failed = true; 9820 9821 if (!Failed && !Cond) { 9822 llvm::SmallString<256> MsgBuffer; 9823 llvm::raw_svector_ostream Msg(MsgBuffer); 9824 AssertMessage->printPretty(Msg, Context, 0, getPrintingPolicy()); 9825 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9826 << Msg.str() << AssertExpr->getSourceRange(); 9827 Failed = true; 9828 } 9829 } 9830 9831 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9832 AssertExpr, AssertMessage, RParenLoc, 9833 Failed); 9834 9835 CurContext->addDecl(Decl); 9836 return Decl; 9837} 9838 9839/// \brief Perform semantic analysis of the given friend type declaration. 9840/// 9841/// \returns A friend declaration that. 9842FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9843 SourceLocation FriendLoc, 9844 TypeSourceInfo *TSInfo) { 9845 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9846 9847 QualType T = TSInfo->getType(); 9848 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9849 9850 // C++03 [class.friend]p2: 9851 // An elaborated-type-specifier shall be used in a friend declaration 9852 // for a class.* 9853 // 9854 // * The class-key of the elaborated-type-specifier is required. 9855 if (!ActiveTemplateInstantiations.empty()) { 9856 // Do not complain about the form of friend template types during 9857 // template instantiation; we will already have complained when the 9858 // template was declared. 9859 } else if (!T->isElaboratedTypeSpecifier()) { 9860 // If we evaluated the type to a record type, suggest putting 9861 // a tag in front. 9862 if (const RecordType *RT = T->getAs<RecordType>()) { 9863 RecordDecl *RD = RT->getDecl(); 9864 9865 std::string InsertionText = std::string(" ") + RD->getKindName(); 9866 9867 Diag(TypeRange.getBegin(), 9868 getLangOpts().CPlusPlus0x ? 9869 diag::warn_cxx98_compat_unelaborated_friend_type : 9870 diag::ext_unelaborated_friend_type) 9871 << (unsigned) RD->getTagKind() 9872 << T 9873 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9874 InsertionText); 9875 } else { 9876 Diag(FriendLoc, 9877 getLangOpts().CPlusPlus0x ? 9878 diag::warn_cxx98_compat_nonclass_type_friend : 9879 diag::ext_nonclass_type_friend) 9880 << T 9881 << SourceRange(FriendLoc, TypeRange.getEnd()); 9882 } 9883 } else if (T->getAs<EnumType>()) { 9884 Diag(FriendLoc, 9885 getLangOpts().CPlusPlus0x ? 9886 diag::warn_cxx98_compat_enum_friend : 9887 diag::ext_enum_friend) 9888 << T 9889 << SourceRange(FriendLoc, TypeRange.getEnd()); 9890 } 9891 9892 // C++0x [class.friend]p3: 9893 // If the type specifier in a friend declaration designates a (possibly 9894 // cv-qualified) class type, that class is declared as a friend; otherwise, 9895 // the friend declaration is ignored. 9896 9897 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9898 // in [class.friend]p3 that we do not implement. 9899 9900 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9901} 9902 9903/// Handle a friend tag declaration where the scope specifier was 9904/// templated. 9905Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9906 unsigned TagSpec, SourceLocation TagLoc, 9907 CXXScopeSpec &SS, 9908 IdentifierInfo *Name, SourceLocation NameLoc, 9909 AttributeList *Attr, 9910 MultiTemplateParamsArg TempParamLists) { 9911 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9912 9913 bool isExplicitSpecialization = false; 9914 bool Invalid = false; 9915 9916 if (TemplateParameterList *TemplateParams 9917 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9918 TempParamLists.get(), 9919 TempParamLists.size(), 9920 /*friend*/ true, 9921 isExplicitSpecialization, 9922 Invalid)) { 9923 if (TemplateParams->size() > 0) { 9924 // This is a declaration of a class template. 9925 if (Invalid) 9926 return 0; 9927 9928 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9929 SS, Name, NameLoc, Attr, 9930 TemplateParams, AS_public, 9931 /*ModulePrivateLoc=*/SourceLocation(), 9932 TempParamLists.size() - 1, 9933 (TemplateParameterList**) TempParamLists.release()).take(); 9934 } else { 9935 // The "template<>" header is extraneous. 9936 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9937 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9938 isExplicitSpecialization = true; 9939 } 9940 } 9941 9942 if (Invalid) return 0; 9943 9944 bool isAllExplicitSpecializations = true; 9945 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9946 if (TempParamLists.get()[I]->size()) { 9947 isAllExplicitSpecializations = false; 9948 break; 9949 } 9950 } 9951 9952 // FIXME: don't ignore attributes. 9953 9954 // If it's explicit specializations all the way down, just forget 9955 // about the template header and build an appropriate non-templated 9956 // friend. TODO: for source fidelity, remember the headers. 9957 if (isAllExplicitSpecializations) { 9958 if (SS.isEmpty()) { 9959 bool Owned = false; 9960 bool IsDependent = false; 9961 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9962 Attr, AS_public, 9963 /*ModulePrivateLoc=*/SourceLocation(), 9964 MultiTemplateParamsArg(), Owned, IsDependent, 9965 /*ScopedEnumKWLoc=*/SourceLocation(), 9966 /*ScopedEnumUsesClassTag=*/false, 9967 /*UnderlyingType=*/TypeResult()); 9968 } 9969 9970 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9971 ElaboratedTypeKeyword Keyword 9972 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9973 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9974 *Name, NameLoc); 9975 if (T.isNull()) 9976 return 0; 9977 9978 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9979 if (isa<DependentNameType>(T)) { 9980 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9981 TL.setElaboratedKeywordLoc(TagLoc); 9982 TL.setQualifierLoc(QualifierLoc); 9983 TL.setNameLoc(NameLoc); 9984 } else { 9985 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9986 TL.setElaboratedKeywordLoc(TagLoc); 9987 TL.setQualifierLoc(QualifierLoc); 9988 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9989 } 9990 9991 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9992 TSI, FriendLoc); 9993 Friend->setAccess(AS_public); 9994 CurContext->addDecl(Friend); 9995 return Friend; 9996 } 9997 9998 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9999 10000 10001 10002 // Handle the case of a templated-scope friend class. e.g. 10003 // template <class T> class A<T>::B; 10004 // FIXME: we don't support these right now. 10005 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10006 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10007 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10008 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10009 TL.setElaboratedKeywordLoc(TagLoc); 10010 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10011 TL.setNameLoc(NameLoc); 10012 10013 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10014 TSI, FriendLoc); 10015 Friend->setAccess(AS_public); 10016 Friend->setUnsupportedFriend(true); 10017 CurContext->addDecl(Friend); 10018 return Friend; 10019} 10020 10021 10022/// Handle a friend type declaration. This works in tandem with 10023/// ActOnTag. 10024/// 10025/// Notes on friend class templates: 10026/// 10027/// We generally treat friend class declarations as if they were 10028/// declaring a class. So, for example, the elaborated type specifier 10029/// in a friend declaration is required to obey the restrictions of a 10030/// class-head (i.e. no typedefs in the scope chain), template 10031/// parameters are required to match up with simple template-ids, &c. 10032/// However, unlike when declaring a template specialization, it's 10033/// okay to refer to a template specialization without an empty 10034/// template parameter declaration, e.g. 10035/// friend class A<T>::B<unsigned>; 10036/// We permit this as a special case; if there are any template 10037/// parameters present at all, require proper matching, i.e. 10038/// template <> template \<class T> friend class A<int>::B; 10039Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10040 MultiTemplateParamsArg TempParams) { 10041 SourceLocation Loc = DS.getLocStart(); 10042 10043 assert(DS.isFriendSpecified()); 10044 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10045 10046 // Try to convert the decl specifier to a type. This works for 10047 // friend templates because ActOnTag never produces a ClassTemplateDecl 10048 // for a TUK_Friend. 10049 Declarator TheDeclarator(DS, Declarator::MemberContext); 10050 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10051 QualType T = TSI->getType(); 10052 if (TheDeclarator.isInvalidType()) 10053 return 0; 10054 10055 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10056 return 0; 10057 10058 // This is definitely an error in C++98. It's probably meant to 10059 // be forbidden in C++0x, too, but the specification is just 10060 // poorly written. 10061 // 10062 // The problem is with declarations like the following: 10063 // template <T> friend A<T>::foo; 10064 // where deciding whether a class C is a friend or not now hinges 10065 // on whether there exists an instantiation of A that causes 10066 // 'foo' to equal C. There are restrictions on class-heads 10067 // (which we declare (by fiat) elaborated friend declarations to 10068 // be) that makes this tractable. 10069 // 10070 // FIXME: handle "template <> friend class A<T>;", which 10071 // is possibly well-formed? Who even knows? 10072 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10073 Diag(Loc, diag::err_tagless_friend_type_template) 10074 << DS.getSourceRange(); 10075 return 0; 10076 } 10077 10078 // C++98 [class.friend]p1: A friend of a class is a function 10079 // or class that is not a member of the class . . . 10080 // This is fixed in DR77, which just barely didn't make the C++03 10081 // deadline. It's also a very silly restriction that seriously 10082 // affects inner classes and which nobody else seems to implement; 10083 // thus we never diagnose it, not even in -pedantic. 10084 // 10085 // But note that we could warn about it: it's always useless to 10086 // friend one of your own members (it's not, however, worthless to 10087 // friend a member of an arbitrary specialization of your template). 10088 10089 Decl *D; 10090 if (unsigned NumTempParamLists = TempParams.size()) 10091 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10092 NumTempParamLists, 10093 TempParams.release(), 10094 TSI, 10095 DS.getFriendSpecLoc()); 10096 else 10097 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10098 10099 if (!D) 10100 return 0; 10101 10102 D->setAccess(AS_public); 10103 CurContext->addDecl(D); 10104 10105 return D; 10106} 10107 10108Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10109 MultiTemplateParamsArg TemplateParams) { 10110 const DeclSpec &DS = D.getDeclSpec(); 10111 10112 assert(DS.isFriendSpecified()); 10113 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10114 10115 SourceLocation Loc = D.getIdentifierLoc(); 10116 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10117 10118 // C++ [class.friend]p1 10119 // A friend of a class is a function or class.... 10120 // Note that this sees through typedefs, which is intended. 10121 // It *doesn't* see through dependent types, which is correct 10122 // according to [temp.arg.type]p3: 10123 // If a declaration acquires a function type through a 10124 // type dependent on a template-parameter and this causes 10125 // a declaration that does not use the syntactic form of a 10126 // function declarator to have a function type, the program 10127 // is ill-formed. 10128 if (!TInfo->getType()->isFunctionType()) { 10129 Diag(Loc, diag::err_unexpected_friend); 10130 10131 // It might be worthwhile to try to recover by creating an 10132 // appropriate declaration. 10133 return 0; 10134 } 10135 10136 // C++ [namespace.memdef]p3 10137 // - If a friend declaration in a non-local class first declares a 10138 // class or function, the friend class or function is a member 10139 // of the innermost enclosing namespace. 10140 // - The name of the friend is not found by simple name lookup 10141 // until a matching declaration is provided in that namespace 10142 // scope (either before or after the class declaration granting 10143 // friendship). 10144 // - If a friend function is called, its name may be found by the 10145 // name lookup that considers functions from namespaces and 10146 // classes associated with the types of the function arguments. 10147 // - When looking for a prior declaration of a class or a function 10148 // declared as a friend, scopes outside the innermost enclosing 10149 // namespace scope are not considered. 10150 10151 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10152 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10153 DeclarationName Name = NameInfo.getName(); 10154 assert(Name); 10155 10156 // Check for unexpanded parameter packs. 10157 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10158 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10159 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10160 return 0; 10161 10162 // The context we found the declaration in, or in which we should 10163 // create the declaration. 10164 DeclContext *DC; 10165 Scope *DCScope = S; 10166 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10167 ForRedeclaration); 10168 10169 // FIXME: there are different rules in local classes 10170 10171 // There are four cases here. 10172 // - There's no scope specifier, in which case we just go to the 10173 // appropriate scope and look for a function or function template 10174 // there as appropriate. 10175 // Recover from invalid scope qualifiers as if they just weren't there. 10176 if (SS.isInvalid() || !SS.isSet()) { 10177 // C++0x [namespace.memdef]p3: 10178 // If the name in a friend declaration is neither qualified nor 10179 // a template-id and the declaration is a function or an 10180 // elaborated-type-specifier, the lookup to determine whether 10181 // the entity has been previously declared shall not consider 10182 // any scopes outside the innermost enclosing namespace. 10183 // C++0x [class.friend]p11: 10184 // If a friend declaration appears in a local class and the name 10185 // specified is an unqualified name, a prior declaration is 10186 // looked up without considering scopes that are outside the 10187 // innermost enclosing non-class scope. For a friend function 10188 // declaration, if there is no prior declaration, the program is 10189 // ill-formed. 10190 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10191 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10192 10193 // Find the appropriate context according to the above. 10194 DC = CurContext; 10195 while (true) { 10196 // Skip class contexts. If someone can cite chapter and verse 10197 // for this behavior, that would be nice --- it's what GCC and 10198 // EDG do, and it seems like a reasonable intent, but the spec 10199 // really only says that checks for unqualified existing 10200 // declarations should stop at the nearest enclosing namespace, 10201 // not that they should only consider the nearest enclosing 10202 // namespace. 10203 while (DC->isRecord() || DC->isTransparentContext()) 10204 DC = DC->getParent(); 10205 10206 LookupQualifiedName(Previous, DC); 10207 10208 // TODO: decide what we think about using declarations. 10209 if (isLocal || !Previous.empty()) 10210 break; 10211 10212 if (isTemplateId) { 10213 if (isa<TranslationUnitDecl>(DC)) break; 10214 } else { 10215 if (DC->isFileContext()) break; 10216 } 10217 DC = DC->getParent(); 10218 } 10219 10220 // C++ [class.friend]p1: A friend of a class is a function or 10221 // class that is not a member of the class . . . 10222 // C++11 changes this for both friend types and functions. 10223 // Most C++ 98 compilers do seem to give an error here, so 10224 // we do, too. 10225 if (!Previous.empty() && DC->Equals(CurContext)) 10226 Diag(DS.getFriendSpecLoc(), 10227 getLangOpts().CPlusPlus0x ? 10228 diag::warn_cxx98_compat_friend_is_member : 10229 diag::err_friend_is_member); 10230 10231 DCScope = getScopeForDeclContext(S, DC); 10232 10233 // C++ [class.friend]p6: 10234 // A function can be defined in a friend declaration of a class if and 10235 // only if the class is a non-local class (9.8), the function name is 10236 // unqualified, and the function has namespace scope. 10237 if (isLocal && D.isFunctionDefinition()) { 10238 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10239 } 10240 10241 // - There's a non-dependent scope specifier, in which case we 10242 // compute it and do a previous lookup there for a function 10243 // or function template. 10244 } else if (!SS.getScopeRep()->isDependent()) { 10245 DC = computeDeclContext(SS); 10246 if (!DC) return 0; 10247 10248 if (RequireCompleteDeclContext(SS, DC)) return 0; 10249 10250 LookupQualifiedName(Previous, DC); 10251 10252 // Ignore things found implicitly in the wrong scope. 10253 // TODO: better diagnostics for this case. Suggesting the right 10254 // qualified scope would be nice... 10255 LookupResult::Filter F = Previous.makeFilter(); 10256 while (F.hasNext()) { 10257 NamedDecl *D = F.next(); 10258 if (!DC->InEnclosingNamespaceSetOf( 10259 D->getDeclContext()->getRedeclContext())) 10260 F.erase(); 10261 } 10262 F.done(); 10263 10264 if (Previous.empty()) { 10265 D.setInvalidType(); 10266 Diag(Loc, diag::err_qualified_friend_not_found) 10267 << Name << TInfo->getType(); 10268 return 0; 10269 } 10270 10271 // C++ [class.friend]p1: A friend of a class is a function or 10272 // class that is not a member of the class . . . 10273 if (DC->Equals(CurContext)) 10274 Diag(DS.getFriendSpecLoc(), 10275 getLangOpts().CPlusPlus0x ? 10276 diag::warn_cxx98_compat_friend_is_member : 10277 diag::err_friend_is_member); 10278 10279 if (D.isFunctionDefinition()) { 10280 // C++ [class.friend]p6: 10281 // A function can be defined in a friend declaration of a class if and 10282 // only if the class is a non-local class (9.8), the function name is 10283 // unqualified, and the function has namespace scope. 10284 SemaDiagnosticBuilder DB 10285 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10286 10287 DB << SS.getScopeRep(); 10288 if (DC->isFileContext()) 10289 DB << FixItHint::CreateRemoval(SS.getRange()); 10290 SS.clear(); 10291 } 10292 10293 // - There's a scope specifier that does not match any template 10294 // parameter lists, in which case we use some arbitrary context, 10295 // create a method or method template, and wait for instantiation. 10296 // - There's a scope specifier that does match some template 10297 // parameter lists, which we don't handle right now. 10298 } else { 10299 if (D.isFunctionDefinition()) { 10300 // C++ [class.friend]p6: 10301 // A function can be defined in a friend declaration of a class if and 10302 // only if the class is a non-local class (9.8), the function name is 10303 // unqualified, and the function has namespace scope. 10304 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10305 << SS.getScopeRep(); 10306 } 10307 10308 DC = CurContext; 10309 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10310 } 10311 10312 if (!DC->isRecord()) { 10313 // This implies that it has to be an operator or function. 10314 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10315 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10316 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10317 Diag(Loc, diag::err_introducing_special_friend) << 10318 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10319 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10320 return 0; 10321 } 10322 } 10323 10324 // FIXME: This is an egregious hack to cope with cases where the scope stack 10325 // does not contain the declaration context, i.e., in an out-of-line 10326 // definition of a class. 10327 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10328 if (!DCScope) { 10329 FakeDCScope.setEntity(DC); 10330 DCScope = &FakeDCScope; 10331 } 10332 10333 bool AddToScope = true; 10334 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10335 move(TemplateParams), AddToScope); 10336 if (!ND) return 0; 10337 10338 assert(ND->getDeclContext() == DC); 10339 assert(ND->getLexicalDeclContext() == CurContext); 10340 10341 // Add the function declaration to the appropriate lookup tables, 10342 // adjusting the redeclarations list as necessary. We don't 10343 // want to do this yet if the friending class is dependent. 10344 // 10345 // Also update the scope-based lookup if the target context's 10346 // lookup context is in lexical scope. 10347 if (!CurContext->isDependentContext()) { 10348 DC = DC->getRedeclContext(); 10349 DC->makeDeclVisibleInContext(ND); 10350 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10351 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10352 } 10353 10354 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10355 D.getIdentifierLoc(), ND, 10356 DS.getFriendSpecLoc()); 10357 FrD->setAccess(AS_public); 10358 CurContext->addDecl(FrD); 10359 10360 if (ND->isInvalidDecl()) 10361 FrD->setInvalidDecl(); 10362 else { 10363 FunctionDecl *FD; 10364 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10365 FD = FTD->getTemplatedDecl(); 10366 else 10367 FD = cast<FunctionDecl>(ND); 10368 10369 // Mark templated-scope function declarations as unsupported. 10370 if (FD->getNumTemplateParameterLists()) 10371 FrD->setUnsupportedFriend(true); 10372 } 10373 10374 return ND; 10375} 10376 10377void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10378 AdjustDeclIfTemplate(Dcl); 10379 10380 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10381 if (!Fn) { 10382 Diag(DelLoc, diag::err_deleted_non_function); 10383 return; 10384 } 10385 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10386 // Don't consider the implicit declaration we generate for explicit 10387 // specializations. FIXME: Do not generate these implicit declarations. 10388 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 10389 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 10390 Diag(DelLoc, diag::err_deleted_decl_not_first); 10391 Diag(Prev->getLocation(), diag::note_previous_declaration); 10392 } 10393 // If the declaration wasn't the first, we delete the function anyway for 10394 // recovery. 10395 } 10396 Fn->setDeletedAsWritten(); 10397 10398 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10399 if (!MD) 10400 return; 10401 10402 // A deleted special member function is trivial if the corresponding 10403 // implicitly-declared function would have been. 10404 switch (getSpecialMember(MD)) { 10405 case CXXInvalid: 10406 break; 10407 case CXXDefaultConstructor: 10408 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor()); 10409 break; 10410 case CXXCopyConstructor: 10411 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor()); 10412 break; 10413 case CXXMoveConstructor: 10414 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor()); 10415 break; 10416 case CXXCopyAssignment: 10417 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 10418 break; 10419 case CXXMoveAssignment: 10420 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 10421 break; 10422 case CXXDestructor: 10423 MD->setTrivial(MD->getParent()->hasTrivialDestructor()); 10424 break; 10425 } 10426} 10427 10428void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10429 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10430 10431 if (MD) { 10432 if (MD->getParent()->isDependentType()) { 10433 MD->setDefaulted(); 10434 MD->setExplicitlyDefaulted(); 10435 return; 10436 } 10437 10438 CXXSpecialMember Member = getSpecialMember(MD); 10439 if (Member == CXXInvalid) { 10440 Diag(DefaultLoc, diag::err_default_special_members); 10441 return; 10442 } 10443 10444 MD->setDefaulted(); 10445 MD->setExplicitlyDefaulted(); 10446 10447 // If this definition appears within the record, do the checking when 10448 // the record is complete. 10449 const FunctionDecl *Primary = MD; 10450 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10451 // Find the uninstantiated declaration that actually had the '= default' 10452 // on it. 10453 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10454 10455 if (Primary == Primary->getCanonicalDecl()) 10456 return; 10457 10458 CheckExplicitlyDefaultedSpecialMember(MD); 10459 10460 switch (Member) { 10461 case CXXDefaultConstructor: { 10462 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10463 if (!CD->isInvalidDecl()) 10464 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10465 break; 10466 } 10467 10468 case CXXCopyConstructor: { 10469 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10470 if (!CD->isInvalidDecl()) 10471 DefineImplicitCopyConstructor(DefaultLoc, CD); 10472 break; 10473 } 10474 10475 case CXXCopyAssignment: { 10476 if (!MD->isInvalidDecl()) 10477 DefineImplicitCopyAssignment(DefaultLoc, MD); 10478 break; 10479 } 10480 10481 case CXXDestructor: { 10482 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10483 if (!DD->isInvalidDecl()) 10484 DefineImplicitDestructor(DefaultLoc, DD); 10485 break; 10486 } 10487 10488 case CXXMoveConstructor: { 10489 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10490 if (!CD->isInvalidDecl()) 10491 DefineImplicitMoveConstructor(DefaultLoc, CD); 10492 break; 10493 } 10494 10495 case CXXMoveAssignment: { 10496 if (!MD->isInvalidDecl()) 10497 DefineImplicitMoveAssignment(DefaultLoc, MD); 10498 break; 10499 } 10500 10501 case CXXInvalid: 10502 llvm_unreachable("Invalid special member."); 10503 } 10504 } else { 10505 Diag(DefaultLoc, diag::err_default_special_members); 10506 } 10507} 10508 10509static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10510 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10511 Stmt *SubStmt = *CI; 10512 if (!SubStmt) 10513 continue; 10514 if (isa<ReturnStmt>(SubStmt)) 10515 Self.Diag(SubStmt->getLocStart(), 10516 diag::err_return_in_constructor_handler); 10517 if (!isa<Expr>(SubStmt)) 10518 SearchForReturnInStmt(Self, SubStmt); 10519 } 10520} 10521 10522void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10523 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10524 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10525 SearchForReturnInStmt(*this, Handler); 10526 } 10527} 10528 10529bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10530 const CXXMethodDecl *Old) { 10531 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10532 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10533 10534 if (Context.hasSameType(NewTy, OldTy) || 10535 NewTy->isDependentType() || OldTy->isDependentType()) 10536 return false; 10537 10538 // Check if the return types are covariant 10539 QualType NewClassTy, OldClassTy; 10540 10541 /// Both types must be pointers or references to classes. 10542 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10543 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10544 NewClassTy = NewPT->getPointeeType(); 10545 OldClassTy = OldPT->getPointeeType(); 10546 } 10547 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10548 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10549 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10550 NewClassTy = NewRT->getPointeeType(); 10551 OldClassTy = OldRT->getPointeeType(); 10552 } 10553 } 10554 } 10555 10556 // The return types aren't either both pointers or references to a class type. 10557 if (NewClassTy.isNull()) { 10558 Diag(New->getLocation(), 10559 diag::err_different_return_type_for_overriding_virtual_function) 10560 << New->getDeclName() << NewTy << OldTy; 10561 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10562 10563 return true; 10564 } 10565 10566 // C++ [class.virtual]p6: 10567 // If the return type of D::f differs from the return type of B::f, the 10568 // class type in the return type of D::f shall be complete at the point of 10569 // declaration of D::f or shall be the class type D. 10570 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10571 if (!RT->isBeingDefined() && 10572 RequireCompleteType(New->getLocation(), NewClassTy, 10573 diag::err_covariant_return_incomplete, 10574 New->getDeclName())) 10575 return true; 10576 } 10577 10578 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10579 // Check if the new class derives from the old class. 10580 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10581 Diag(New->getLocation(), 10582 diag::err_covariant_return_not_derived) 10583 << New->getDeclName() << NewTy << OldTy; 10584 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10585 return true; 10586 } 10587 10588 // Check if we the conversion from derived to base is valid. 10589 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10590 diag::err_covariant_return_inaccessible_base, 10591 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10592 // FIXME: Should this point to the return type? 10593 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10594 // FIXME: this note won't trigger for delayed access control 10595 // diagnostics, and it's impossible to get an undelayed error 10596 // here from access control during the original parse because 10597 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10598 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10599 return true; 10600 } 10601 } 10602 10603 // The qualifiers of the return types must be the same. 10604 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10605 Diag(New->getLocation(), 10606 diag::err_covariant_return_type_different_qualifications) 10607 << New->getDeclName() << NewTy << OldTy; 10608 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10609 return true; 10610 }; 10611 10612 10613 // The new class type must have the same or less qualifiers as the old type. 10614 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10615 Diag(New->getLocation(), 10616 diag::err_covariant_return_type_class_type_more_qualified) 10617 << New->getDeclName() << NewTy << OldTy; 10618 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10619 return true; 10620 }; 10621 10622 return false; 10623} 10624 10625/// \brief Mark the given method pure. 10626/// 10627/// \param Method the method to be marked pure. 10628/// 10629/// \param InitRange the source range that covers the "0" initializer. 10630bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10631 SourceLocation EndLoc = InitRange.getEnd(); 10632 if (EndLoc.isValid()) 10633 Method->setRangeEnd(EndLoc); 10634 10635 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10636 Method->setPure(); 10637 return false; 10638 } 10639 10640 if (!Method->isInvalidDecl()) 10641 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10642 << Method->getDeclName() << InitRange; 10643 return true; 10644} 10645 10646/// \brief Determine whether the given declaration is a static data member. 10647static bool isStaticDataMember(Decl *D) { 10648 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10649 if (!Var) 10650 return false; 10651 10652 return Var->isStaticDataMember(); 10653} 10654/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10655/// an initializer for the out-of-line declaration 'Dcl'. The scope 10656/// is a fresh scope pushed for just this purpose. 10657/// 10658/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10659/// static data member of class X, names should be looked up in the scope of 10660/// class X. 10661void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10662 // If there is no declaration, there was an error parsing it. 10663 if (D == 0 || D->isInvalidDecl()) return; 10664 10665 // We should only get called for declarations with scope specifiers, like: 10666 // int foo::bar; 10667 assert(D->isOutOfLine()); 10668 EnterDeclaratorContext(S, D->getDeclContext()); 10669 10670 // If we are parsing the initializer for a static data member, push a 10671 // new expression evaluation context that is associated with this static 10672 // data member. 10673 if (isStaticDataMember(D)) 10674 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10675} 10676 10677/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10678/// initializer for the out-of-line declaration 'D'. 10679void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10680 // If there is no declaration, there was an error parsing it. 10681 if (D == 0 || D->isInvalidDecl()) return; 10682 10683 if (isStaticDataMember(D)) 10684 PopExpressionEvaluationContext(); 10685 10686 assert(D->isOutOfLine()); 10687 ExitDeclaratorContext(S); 10688} 10689 10690/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10691/// C++ if/switch/while/for statement. 10692/// e.g: "if (int x = f()) {...}" 10693DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10694 // C++ 6.4p2: 10695 // The declarator shall not specify a function or an array. 10696 // The type-specifier-seq shall not contain typedef and shall not declare a 10697 // new class or enumeration. 10698 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10699 "Parser allowed 'typedef' as storage class of condition decl."); 10700 10701 Decl *Dcl = ActOnDeclarator(S, D); 10702 if (!Dcl) 10703 return true; 10704 10705 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10706 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10707 << D.getSourceRange(); 10708 return true; 10709 } 10710 10711 return Dcl; 10712} 10713 10714void Sema::LoadExternalVTableUses() { 10715 if (!ExternalSource) 10716 return; 10717 10718 SmallVector<ExternalVTableUse, 4> VTables; 10719 ExternalSource->ReadUsedVTables(VTables); 10720 SmallVector<VTableUse, 4> NewUses; 10721 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10722 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10723 = VTablesUsed.find(VTables[I].Record); 10724 // Even if a definition wasn't required before, it may be required now. 10725 if (Pos != VTablesUsed.end()) { 10726 if (!Pos->second && VTables[I].DefinitionRequired) 10727 Pos->second = true; 10728 continue; 10729 } 10730 10731 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10732 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10733 } 10734 10735 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10736} 10737 10738void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10739 bool DefinitionRequired) { 10740 // Ignore any vtable uses in unevaluated operands or for classes that do 10741 // not have a vtable. 10742 if (!Class->isDynamicClass() || Class->isDependentContext() || 10743 CurContext->isDependentContext() || 10744 ExprEvalContexts.back().Context == Unevaluated) 10745 return; 10746 10747 // Try to insert this class into the map. 10748 LoadExternalVTableUses(); 10749 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10750 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10751 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10752 if (!Pos.second) { 10753 // If we already had an entry, check to see if we are promoting this vtable 10754 // to required a definition. If so, we need to reappend to the VTableUses 10755 // list, since we may have already processed the first entry. 10756 if (DefinitionRequired && !Pos.first->second) { 10757 Pos.first->second = true; 10758 } else { 10759 // Otherwise, we can early exit. 10760 return; 10761 } 10762 } 10763 10764 // Local classes need to have their virtual members marked 10765 // immediately. For all other classes, we mark their virtual members 10766 // at the end of the translation unit. 10767 if (Class->isLocalClass()) 10768 MarkVirtualMembersReferenced(Loc, Class); 10769 else 10770 VTableUses.push_back(std::make_pair(Class, Loc)); 10771} 10772 10773bool Sema::DefineUsedVTables() { 10774 LoadExternalVTableUses(); 10775 if (VTableUses.empty()) 10776 return false; 10777 10778 // Note: The VTableUses vector could grow as a result of marking 10779 // the members of a class as "used", so we check the size each 10780 // time through the loop and prefer indices (which are stable) to 10781 // iterators (which are not). 10782 bool DefinedAnything = false; 10783 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10784 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10785 if (!Class) 10786 continue; 10787 10788 SourceLocation Loc = VTableUses[I].second; 10789 10790 bool DefineVTable = true; 10791 10792 // If this class has a key function, but that key function is 10793 // defined in another translation unit, we don't need to emit the 10794 // vtable even though we're using it. 10795 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10796 if (KeyFunction && !KeyFunction->hasBody()) { 10797 switch (KeyFunction->getTemplateSpecializationKind()) { 10798 case TSK_Undeclared: 10799 case TSK_ExplicitSpecialization: 10800 case TSK_ExplicitInstantiationDeclaration: 10801 // The key function is in another translation unit. 10802 DefineVTable = false; 10803 break; 10804 10805 case TSK_ExplicitInstantiationDefinition: 10806 case TSK_ImplicitInstantiation: 10807 // We will be instantiating the key function. 10808 break; 10809 } 10810 } else if (!KeyFunction) { 10811 // If we have a class with no key function that is the subject 10812 // of an explicit instantiation declaration, suppress the 10813 // vtable; it will live with the explicit instantiation 10814 // definition. 10815 bool IsExplicitInstantiationDeclaration 10816 = Class->getTemplateSpecializationKind() 10817 == TSK_ExplicitInstantiationDeclaration; 10818 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10819 REnd = Class->redecls_end(); 10820 R != REnd; ++R) { 10821 TemplateSpecializationKind TSK 10822 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10823 if (TSK == TSK_ExplicitInstantiationDeclaration) 10824 IsExplicitInstantiationDeclaration = true; 10825 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10826 IsExplicitInstantiationDeclaration = false; 10827 break; 10828 } 10829 } 10830 10831 if (IsExplicitInstantiationDeclaration) 10832 DefineVTable = false; 10833 } 10834 10835 // The exception specifications for all virtual members may be needed even 10836 // if we are not providing an authoritative form of the vtable in this TU. 10837 // We may choose to emit it available_externally anyway. 10838 if (!DefineVTable) { 10839 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 10840 continue; 10841 } 10842 10843 // Mark all of the virtual members of this class as referenced, so 10844 // that we can build a vtable. Then, tell the AST consumer that a 10845 // vtable for this class is required. 10846 DefinedAnything = true; 10847 MarkVirtualMembersReferenced(Loc, Class); 10848 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10849 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10850 10851 // Optionally warn if we're emitting a weak vtable. 10852 if (Class->getLinkage() == ExternalLinkage && 10853 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10854 const FunctionDecl *KeyFunctionDef = 0; 10855 if (!KeyFunction || 10856 (KeyFunction->hasBody(KeyFunctionDef) && 10857 KeyFunctionDef->isInlined())) 10858 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10859 TSK_ExplicitInstantiationDefinition 10860 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10861 << Class; 10862 } 10863 } 10864 VTableUses.clear(); 10865 10866 return DefinedAnything; 10867} 10868 10869void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 10870 const CXXRecordDecl *RD) { 10871 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 10872 E = RD->method_end(); I != E; ++I) 10873 if ((*I)->isVirtual() && !(*I)->isPure()) 10874 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 10875} 10876 10877void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10878 const CXXRecordDecl *RD) { 10879 // Mark all functions which will appear in RD's vtable as used. 10880 CXXFinalOverriderMap FinalOverriders; 10881 RD->getFinalOverriders(FinalOverriders); 10882 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 10883 E = FinalOverriders.end(); 10884 I != E; ++I) { 10885 for (OverridingMethods::const_iterator OI = I->second.begin(), 10886 OE = I->second.end(); 10887 OI != OE; ++OI) { 10888 assert(OI->second.size() > 0 && "no final overrider"); 10889 CXXMethodDecl *Overrider = OI->second.front().Method; 10890 10891 // C++ [basic.def.odr]p2: 10892 // [...] A virtual member function is used if it is not pure. [...] 10893 if (!Overrider->isPure()) 10894 MarkFunctionReferenced(Loc, Overrider); 10895 } 10896 } 10897 10898 // Only classes that have virtual bases need a VTT. 10899 if (RD->getNumVBases() == 0) 10900 return; 10901 10902 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10903 e = RD->bases_end(); i != e; ++i) { 10904 const CXXRecordDecl *Base = 10905 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10906 if (Base->getNumVBases() == 0) 10907 continue; 10908 MarkVirtualMembersReferenced(Loc, Base); 10909 } 10910} 10911 10912/// SetIvarInitializers - This routine builds initialization ASTs for the 10913/// Objective-C implementation whose ivars need be initialized. 10914void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10915 if (!getLangOpts().CPlusPlus) 10916 return; 10917 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10918 SmallVector<ObjCIvarDecl*, 8> ivars; 10919 CollectIvarsToConstructOrDestruct(OID, ivars); 10920 if (ivars.empty()) 10921 return; 10922 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10923 for (unsigned i = 0; i < ivars.size(); i++) { 10924 FieldDecl *Field = ivars[i]; 10925 if (Field->isInvalidDecl()) 10926 continue; 10927 10928 CXXCtorInitializer *Member; 10929 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10930 InitializationKind InitKind = 10931 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10932 10933 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10934 ExprResult MemberInit = 10935 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10936 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10937 // Note, MemberInit could actually come back empty if no initialization 10938 // is required (e.g., because it would call a trivial default constructor) 10939 if (!MemberInit.get() || MemberInit.isInvalid()) 10940 continue; 10941 10942 Member = 10943 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10944 SourceLocation(), 10945 MemberInit.takeAs<Expr>(), 10946 SourceLocation()); 10947 AllToInit.push_back(Member); 10948 10949 // Be sure that the destructor is accessible and is marked as referenced. 10950 if (const RecordType *RecordTy 10951 = Context.getBaseElementType(Field->getType()) 10952 ->getAs<RecordType>()) { 10953 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10954 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10955 MarkFunctionReferenced(Field->getLocation(), Destructor); 10956 CheckDestructorAccess(Field->getLocation(), Destructor, 10957 PDiag(diag::err_access_dtor_ivar) 10958 << Context.getBaseElementType(Field->getType())); 10959 } 10960 } 10961 } 10962 ObjCImplementation->setIvarInitializers(Context, 10963 AllToInit.data(), AllToInit.size()); 10964 } 10965} 10966 10967static 10968void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10969 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10970 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10971 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10972 Sema &S) { 10973 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10974 CE = Current.end(); 10975 if (Ctor->isInvalidDecl()) 10976 return; 10977 10978 const FunctionDecl *FNTarget = 0; 10979 CXXConstructorDecl *Target; 10980 10981 // We ignore the result here since if we don't have a body, Target will be 10982 // null below. 10983 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10984 Target 10985= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10986 10987 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10988 // Avoid dereferencing a null pointer here. 10989 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10990 10991 if (!Current.insert(Canonical)) 10992 return; 10993 10994 // We know that beyond here, we aren't chaining into a cycle. 10995 if (!Target || !Target->isDelegatingConstructor() || 10996 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10997 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10998 Valid.insert(*CI); 10999 Current.clear(); 11000 // We've hit a cycle. 11001 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 11002 Current.count(TCanonical)) { 11003 // If we haven't diagnosed this cycle yet, do so now. 11004 if (!Invalid.count(TCanonical)) { 11005 S.Diag((*Ctor->init_begin())->getSourceLocation(), 11006 diag::warn_delegating_ctor_cycle) 11007 << Ctor; 11008 11009 // Don't add a note for a function delegating directo to itself. 11010 if (TCanonical != Canonical) 11011 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11012 11013 CXXConstructorDecl *C = Target; 11014 while (C->getCanonicalDecl() != Canonical) { 11015 (void)C->getTargetConstructor()->hasBody(FNTarget); 11016 assert(FNTarget && "Ctor cycle through bodiless function"); 11017 11018 C 11019 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 11020 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11021 } 11022 } 11023 11024 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11025 Invalid.insert(*CI); 11026 Current.clear(); 11027 } else { 11028 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11029 } 11030} 11031 11032 11033void Sema::CheckDelegatingCtorCycles() { 11034 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11035 11036 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11037 CE = Current.end(); 11038 11039 for (DelegatingCtorDeclsType::iterator 11040 I = DelegatingCtorDecls.begin(ExternalSource), 11041 E = DelegatingCtorDecls.end(); 11042 I != E; ++I) { 11043 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11044 } 11045 11046 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11047 (*CI)->setInvalidDecl(); 11048} 11049 11050namespace { 11051 /// \brief AST visitor that finds references to the 'this' expression. 11052 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 11053 Sema &S; 11054 11055 public: 11056 explicit FindCXXThisExpr(Sema &S) : S(S) { } 11057 11058 bool VisitCXXThisExpr(CXXThisExpr *E) { 11059 S.Diag(E->getLocation(), diag::err_this_static_member_func) 11060 << E->isImplicit(); 11061 return false; 11062 } 11063 }; 11064} 11065 11066bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 11067 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11068 if (!TSInfo) 11069 return false; 11070 11071 TypeLoc TL = TSInfo->getTypeLoc(); 11072 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11073 if (!ProtoTL) 11074 return false; 11075 11076 // C++11 [expr.prim.general]p3: 11077 // [The expression this] shall not appear before the optional 11078 // cv-qualifier-seq and it shall not appear within the declaration of a 11079 // static member function (although its type and value category are defined 11080 // within a static member function as they are within a non-static member 11081 // function). [ Note: this is because declaration matching does not occur 11082 // until the complete declarator is known. - end note ] 11083 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11084 FindCXXThisExpr Finder(*this); 11085 11086 // If the return type came after the cv-qualifier-seq, check it now. 11087 if (Proto->hasTrailingReturn() && 11088 !Finder.TraverseTypeLoc(ProtoTL->getResultLoc())) 11089 return true; 11090 11091 // Check the exception specification. 11092 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 11093 return true; 11094 11095 return checkThisInStaticMemberFunctionAttributes(Method); 11096} 11097 11098bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 11099 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11100 if (!TSInfo) 11101 return false; 11102 11103 TypeLoc TL = TSInfo->getTypeLoc(); 11104 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11105 if (!ProtoTL) 11106 return false; 11107 11108 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11109 FindCXXThisExpr Finder(*this); 11110 11111 switch (Proto->getExceptionSpecType()) { 11112 case EST_Uninstantiated: 11113 case EST_Unevaluated: 11114 case EST_BasicNoexcept: 11115 case EST_DynamicNone: 11116 case EST_MSAny: 11117 case EST_None: 11118 break; 11119 11120 case EST_ComputedNoexcept: 11121 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11122 return true; 11123 11124 case EST_Dynamic: 11125 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11126 EEnd = Proto->exception_end(); 11127 E != EEnd; ++E) { 11128 if (!Finder.TraverseType(*E)) 11129 return true; 11130 } 11131 break; 11132 } 11133 11134 return false; 11135} 11136 11137bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11138 FindCXXThisExpr Finder(*this); 11139 11140 // Check attributes. 11141 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11142 A != AEnd; ++A) { 11143 // FIXME: This should be emitted by tblgen. 11144 Expr *Arg = 0; 11145 ArrayRef<Expr *> Args; 11146 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11147 Arg = G->getArg(); 11148 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11149 Arg = G->getArg(); 11150 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11151 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11152 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11153 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11154 else if (ExclusiveLockFunctionAttr *ELF 11155 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11156 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11157 else if (SharedLockFunctionAttr *SLF 11158 = dyn_cast<SharedLockFunctionAttr>(*A)) 11159 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11160 else if (ExclusiveTrylockFunctionAttr *ETLF 11161 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11162 Arg = ETLF->getSuccessValue(); 11163 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11164 } else if (SharedTrylockFunctionAttr *STLF 11165 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11166 Arg = STLF->getSuccessValue(); 11167 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11168 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11169 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11170 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11171 Arg = LR->getArg(); 11172 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11173 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11174 else if (ExclusiveLocksRequiredAttr *ELR 11175 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11176 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11177 else if (SharedLocksRequiredAttr *SLR 11178 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11179 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11180 11181 if (Arg && !Finder.TraverseStmt(Arg)) 11182 return true; 11183 11184 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11185 if (!Finder.TraverseStmt(Args[I])) 11186 return true; 11187 } 11188 } 11189 11190 return false; 11191} 11192 11193void 11194Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 11195 ArrayRef<ParsedType> DynamicExceptions, 11196 ArrayRef<SourceRange> DynamicExceptionRanges, 11197 Expr *NoexceptExpr, 11198 llvm::SmallVectorImpl<QualType> &Exceptions, 11199 FunctionProtoType::ExtProtoInfo &EPI) { 11200 Exceptions.clear(); 11201 EPI.ExceptionSpecType = EST; 11202 if (EST == EST_Dynamic) { 11203 Exceptions.reserve(DynamicExceptions.size()); 11204 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 11205 // FIXME: Preserve type source info. 11206 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 11207 11208 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 11209 collectUnexpandedParameterPacks(ET, Unexpanded); 11210 if (!Unexpanded.empty()) { 11211 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 11212 UPPC_ExceptionType, 11213 Unexpanded); 11214 continue; 11215 } 11216 11217 // Check that the type is valid for an exception spec, and 11218 // drop it if not. 11219 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 11220 Exceptions.push_back(ET); 11221 } 11222 EPI.NumExceptions = Exceptions.size(); 11223 EPI.Exceptions = Exceptions.data(); 11224 return; 11225 } 11226 11227 if (EST == EST_ComputedNoexcept) { 11228 // If an error occurred, there's no expression here. 11229 if (NoexceptExpr) { 11230 assert((NoexceptExpr->isTypeDependent() || 11231 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 11232 Context.BoolTy) && 11233 "Parser should have made sure that the expression is boolean"); 11234 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 11235 EPI.ExceptionSpecType = EST_BasicNoexcept; 11236 return; 11237 } 11238 11239 if (!NoexceptExpr->isValueDependent()) 11240 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 11241 diag::err_noexcept_needs_constant_expression, 11242 /*AllowFold*/ false).take(); 11243 EPI.NoexceptExpr = NoexceptExpr; 11244 } 11245 return; 11246 } 11247} 11248 11249/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11250Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11251 // Implicitly declared functions (e.g. copy constructors) are 11252 // __host__ __device__ 11253 if (D->isImplicit()) 11254 return CFT_HostDevice; 11255 11256 if (D->hasAttr<CUDAGlobalAttr>()) 11257 return CFT_Global; 11258 11259 if (D->hasAttr<CUDADeviceAttr>()) { 11260 if (D->hasAttr<CUDAHostAttr>()) 11261 return CFT_HostDevice; 11262 else 11263 return CFT_Device; 11264 } 11265 11266 return CFT_Host; 11267} 11268 11269bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11270 CUDAFunctionTarget CalleeTarget) { 11271 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11272 // Callable from the device only." 11273 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11274 return true; 11275 11276 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11277 // Callable from the host only." 11278 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11279 // Callable from the host only." 11280 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11281 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11282 return true; 11283 11284 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11285 return true; 11286 11287 return false; 11288} 11289