SemaDeclCXX.cpp revision e3f470a718ec00eb8b546e405fa59bc2df2d7c46
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 or unknown spec already, don't bother. 132 if (!Method || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 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_Delayed || 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 || ComputedEST == EST_Delayed) 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 // Instant objects: 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 if (!Record->isDependentType()) 3886 CheckExplicitlyDefaultedMethods(Record); 3887} 3888 3889void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3890 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3891 ME = Record->method_end(); 3892 MI != ME; ++MI) 3893 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) 3894 CheckExplicitlyDefaultedSpecialMember(*MI); 3895} 3896 3897/// Is the special member function which would be selected to perform the 3898/// specified operation on the specified class type a constexpr constructor? 3899static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3900 Sema::CXXSpecialMember CSM, 3901 bool ConstArg) { 3902 Sema::SpecialMemberOverloadResult *SMOR = 3903 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 3904 false, false, false, false); 3905 if (!SMOR || !SMOR->getMethod()) 3906 // A constructor we wouldn't select can't be "involved in initializing" 3907 // anything. 3908 return true; 3909 return SMOR->getMethod()->isConstexpr(); 3910} 3911 3912/// Determine whether the specified special member function would be constexpr 3913/// if it were implicitly defined. 3914static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3915 Sema::CXXSpecialMember CSM, 3916 bool ConstArg) { 3917 if (!S.getLangOpts().CPlusPlus0x) 3918 return false; 3919 3920 // C++11 [dcl.constexpr]p4: 3921 // In the definition of a constexpr constructor [...] 3922 switch (CSM) { 3923 case Sema::CXXDefaultConstructor: 3924 // Since default constructor lookup is essentially trivial (and cannot 3925 // involve, for instance, template instantiation), we compute whether a 3926 // defaulted default constructor is constexpr directly within CXXRecordDecl. 3927 // 3928 // This is important for performance; we need to know whether the default 3929 // constructor is constexpr to determine whether the type is a literal type. 3930 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 3931 3932 case Sema::CXXCopyConstructor: 3933 case Sema::CXXMoveConstructor: 3934 // For copy or move constructors, we need to perform overload resolution. 3935 break; 3936 3937 case Sema::CXXCopyAssignment: 3938 case Sema::CXXMoveAssignment: 3939 case Sema::CXXDestructor: 3940 case Sema::CXXInvalid: 3941 return false; 3942 } 3943 3944 // -- if the class is a non-empty union, or for each non-empty anonymous 3945 // union member of a non-union class, exactly one non-static data member 3946 // shall be initialized; [DR1359] 3947 // 3948 // If we squint, this is guaranteed, since exactly one non-static data member 3949 // will be initialized (if the constructor isn't deleted), we just don't know 3950 // which one. 3951 if (ClassDecl->isUnion()) 3952 return true; 3953 3954 // -- the class shall not have any virtual base classes; 3955 if (ClassDecl->getNumVBases()) 3956 return false; 3957 3958 // -- every constructor involved in initializing [...] base class 3959 // sub-objects shall be a constexpr constructor; 3960 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 3961 BEnd = ClassDecl->bases_end(); 3962 B != BEnd; ++B) { 3963 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 3964 if (!BaseType) continue; 3965 3966 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 3967 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 3968 return false; 3969 } 3970 3971 // -- every constructor involved in initializing non-static data members 3972 // [...] shall be a constexpr constructor; 3973 // -- every non-static data member and base class sub-object shall be 3974 // initialized 3975 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 3976 FEnd = ClassDecl->field_end(); 3977 F != FEnd; ++F) { 3978 if (F->isInvalidDecl()) 3979 continue; 3980 if (const RecordType *RecordTy = 3981 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 3982 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 3983 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 3984 return false; 3985 } 3986 } 3987 3988 // All OK, it's constexpr! 3989 return true; 3990} 3991 3992void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 3993 CXXRecordDecl *RD = MD->getParent(); 3994 CXXSpecialMember CSM = getSpecialMember(MD); 3995 3996 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 3997 "not an explicitly-defaulted special member"); 3998 3999 // Whether this was the first-declared instance of the constructor. 4000 // This affects whether we implicitly add an exception spec and constexpr. 4001 bool First = MD == MD->getCanonicalDecl(); 4002 4003 bool HadError = false; 4004 4005 // C++11 [dcl.fct.def.default]p1: 4006 // A function that is explicitly defaulted shall 4007 // -- be a special member function (checked elsewhere), 4008 // -- have the same type (except for ref-qualifiers, and except that a 4009 // copy operation can take a non-const reference) as an implicit 4010 // declaration, and 4011 // -- not have default arguments. 4012 unsigned ExpectedParams = 1; 4013 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4014 ExpectedParams = 0; 4015 if (MD->getNumParams() != ExpectedParams) { 4016 // This also checks for default arguments: a copy or move constructor with a 4017 // default argument is classified as a default constructor, and assignment 4018 // operations and destructors can't have default arguments. 4019 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4020 << CSM << MD->getSourceRange(); 4021 HadError = true; 4022 } 4023 4024 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4025 4026 // Compute implicit exception specification, argument constness, constexpr 4027 // and triviality. 4028 ImplicitExceptionSpecification Spec(*this); 4029 bool CanHaveConstParam = false; 4030 bool Trivial; 4031 switch (CSM) { 4032 case CXXDefaultConstructor: 4033 Spec = ComputeDefaultedDefaultCtorExceptionSpec(RD); 4034 if (Spec.isDelayed()) 4035 // Exception specification depends on some deferred part of the class. 4036 // We'll try again when the class's definition has been fully processed. 4037 return; 4038 Trivial = RD->hasTrivialDefaultConstructor(); 4039 break; 4040 case CXXCopyConstructor: 4041 llvm::tie(Spec, CanHaveConstParam) = 4042 ComputeDefaultedCopyCtorExceptionSpecAndConst(RD); 4043 Trivial = RD->hasTrivialCopyConstructor(); 4044 break; 4045 case CXXCopyAssignment: 4046 llvm::tie(Spec, CanHaveConstParam) = 4047 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(RD); 4048 Trivial = RD->hasTrivialCopyAssignment(); 4049 break; 4050 case CXXMoveConstructor: 4051 Spec = ComputeDefaultedMoveCtorExceptionSpec(RD); 4052 Trivial = RD->hasTrivialMoveConstructor(); 4053 break; 4054 case CXXMoveAssignment: 4055 Spec = ComputeDefaultedMoveAssignmentExceptionSpec(RD); 4056 Trivial = RD->hasTrivialMoveAssignment(); 4057 break; 4058 case CXXDestructor: 4059 Spec = ComputeDefaultedDtorExceptionSpec(RD); 4060 Trivial = RD->hasTrivialDestructor(); 4061 break; 4062 case CXXInvalid: 4063 llvm_unreachable("non-special member explicitly defaulted!"); 4064 } 4065 4066 QualType ReturnType = Context.VoidTy; 4067 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4068 // Check for return type matching. 4069 ReturnType = Type->getResultType(); 4070 QualType ExpectedReturnType = 4071 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4072 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4073 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4074 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4075 HadError = true; 4076 } 4077 4078 // A defaulted special member cannot have cv-qualifiers. 4079 if (Type->getTypeQuals()) { 4080 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4081 << (CSM == CXXMoveAssignment); 4082 HadError = true; 4083 } 4084 } 4085 4086 // Check for parameter type matching. 4087 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4088 bool HasConstParam = false; 4089 if (ExpectedParams && ArgType->isReferenceType()) { 4090 // Argument must be reference to possibly-const T. 4091 QualType ReferentType = ArgType->getPointeeType(); 4092 HasConstParam = ReferentType.isConstQualified(); 4093 4094 if (ReferentType.isVolatileQualified()) { 4095 Diag(MD->getLocation(), 4096 diag::err_defaulted_special_member_volatile_param) << CSM; 4097 HadError = true; 4098 } 4099 4100 if (HasConstParam && !CanHaveConstParam) { 4101 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4102 Diag(MD->getLocation(), 4103 diag::err_defaulted_special_member_copy_const_param) 4104 << (CSM == CXXCopyAssignment); 4105 // FIXME: Explain why this special member can't be const. 4106 } else { 4107 Diag(MD->getLocation(), 4108 diag::err_defaulted_special_member_move_const_param) 4109 << (CSM == CXXMoveAssignment); 4110 } 4111 HadError = true; 4112 } 4113 4114 // If a function is explicitly defaulted on its first declaration, it shall 4115 // have the same parameter type as if it had been implicitly declared. 4116 // (Presumably this is to prevent it from being trivial?) 4117 if (!HasConstParam && CanHaveConstParam && First) 4118 Diag(MD->getLocation(), 4119 diag::err_defaulted_special_member_copy_non_const_param) 4120 << (CSM == CXXCopyAssignment); 4121 } else if (ExpectedParams) { 4122 // A copy assignment operator can take its argument by value, but a 4123 // defaulted one cannot. 4124 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4125 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4126 HadError = true; 4127 } 4128 4129 // Rebuild the type with the implicit exception specification added. 4130 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4131 Spec.getEPI(EPI); 4132 const FunctionProtoType *ImplicitType = cast<FunctionProtoType>( 4133 Context.getFunctionType(ReturnType, &ArgType, ExpectedParams, EPI)); 4134 4135 // C++11 [dcl.fct.def.default]p2: 4136 // An explicitly-defaulted function may be declared constexpr only if it 4137 // would have been implicitly declared as constexpr, 4138 // Do not apply this rule to members of class templates, since core issue 1358 4139 // makes such functions always instantiate to constexpr functions. For 4140 // non-constructors, this is checked elsewhere. 4141 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4142 HasConstParam); 4143 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr && 4144 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4145 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4146 // FIXME: Explain why the constructor can't be constexpr. 4147 HadError = true; 4148 } 4149 // and may have an explicit exception-specification only if it is compatible 4150 // with the exception-specification on the implicit declaration. 4151 if (Type->hasExceptionSpec() && 4152 CheckEquivalentExceptionSpec( 4153 PDiag(diag::err_incorrect_defaulted_exception_spec) << CSM, 4154 PDiag(), ImplicitType, SourceLocation(), Type, MD->getLocation())) 4155 HadError = true; 4156 4157 // If a function is explicitly defaulted on its first declaration, 4158 if (First) { 4159 // -- it is implicitly considered to be constexpr if the implicit 4160 // definition would be, 4161 MD->setConstexpr(Constexpr); 4162 4163 // -- it is implicitly considered to have the same exception-specification 4164 // as if it had been implicitly declared, 4165 MD->setType(QualType(ImplicitType, 0)); 4166 4167 // Such a function is also trivial if the implicitly-declared function 4168 // would have been. 4169 MD->setTrivial(Trivial); 4170 } 4171 4172 if (ShouldDeleteSpecialMember(MD, CSM)) { 4173 if (First) { 4174 MD->setDeletedAsWritten(); 4175 } else { 4176 // C++11 [dcl.fct.def.default]p4: 4177 // [For a] user-provided explicitly-defaulted function [...] if such a 4178 // function is implicitly defined as deleted, the program is ill-formed. 4179 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4180 HadError = true; 4181 } 4182 } 4183 4184 if (HadError) 4185 MD->setInvalidDecl(); 4186} 4187 4188namespace { 4189struct SpecialMemberDeletionInfo { 4190 Sema &S; 4191 CXXMethodDecl *MD; 4192 Sema::CXXSpecialMember CSM; 4193 bool Diagnose; 4194 4195 // Properties of the special member, computed for convenience. 4196 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4197 SourceLocation Loc; 4198 4199 bool AllFieldsAreConst; 4200 4201 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4202 Sema::CXXSpecialMember CSM, bool Diagnose) 4203 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4204 IsConstructor(false), IsAssignment(false), IsMove(false), 4205 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4206 AllFieldsAreConst(true) { 4207 switch (CSM) { 4208 case Sema::CXXDefaultConstructor: 4209 case Sema::CXXCopyConstructor: 4210 IsConstructor = true; 4211 break; 4212 case Sema::CXXMoveConstructor: 4213 IsConstructor = true; 4214 IsMove = true; 4215 break; 4216 case Sema::CXXCopyAssignment: 4217 IsAssignment = true; 4218 break; 4219 case Sema::CXXMoveAssignment: 4220 IsAssignment = true; 4221 IsMove = true; 4222 break; 4223 case Sema::CXXDestructor: 4224 break; 4225 case Sema::CXXInvalid: 4226 llvm_unreachable("invalid special member kind"); 4227 } 4228 4229 if (MD->getNumParams()) { 4230 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4231 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4232 } 4233 } 4234 4235 bool inUnion() const { return MD->getParent()->isUnion(); } 4236 4237 /// Look up the corresponding special member in the given class. 4238 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class) { 4239 unsigned TQ = MD->getTypeQualifiers(); 4240 return S.LookupSpecialMember(Class, CSM, ConstArg, VolatileArg, 4241 MD->getRefQualifier() == RQ_RValue, 4242 TQ & Qualifiers::Const, 4243 TQ & Qualifiers::Volatile); 4244 } 4245 4246 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4247 4248 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4249 bool shouldDeleteForField(FieldDecl *FD); 4250 bool shouldDeleteForAllConstMembers(); 4251 4252 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj); 4253 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4254 Sema::SpecialMemberOverloadResult *SMOR, 4255 bool IsDtorCallInCtor); 4256 4257 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4258}; 4259} 4260 4261/// Is the given special member inaccessible when used on the given 4262/// sub-object. 4263bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4264 CXXMethodDecl *target) { 4265 /// If we're operating on a base class, the object type is the 4266 /// type of this special member. 4267 QualType objectTy; 4268 AccessSpecifier access = target->getAccess();; 4269 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4270 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4271 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4272 4273 // If we're operating on a field, the object type is the type of the field. 4274 } else { 4275 objectTy = S.Context.getTypeDeclType(target->getParent()); 4276 } 4277 4278 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4279} 4280 4281/// Check whether we should delete a special member due to the implicit 4282/// definition containing a call to a special member of a subobject. 4283bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4284 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4285 bool IsDtorCallInCtor) { 4286 CXXMethodDecl *Decl = SMOR->getMethod(); 4287 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4288 4289 int DiagKind = -1; 4290 4291 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4292 DiagKind = !Decl ? 0 : 1; 4293 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4294 DiagKind = 2; 4295 else if (!isAccessible(Subobj, Decl)) 4296 DiagKind = 3; 4297 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4298 !Decl->isTrivial()) { 4299 // A member of a union must have a trivial corresponding special member. 4300 // As a weird special case, a destructor call from a union's constructor 4301 // must be accessible and non-deleted, but need not be trivial. Such a 4302 // destructor is never actually called, but is semantically checked as 4303 // if it were. 4304 DiagKind = 4; 4305 } 4306 4307 if (DiagKind == -1) 4308 return false; 4309 4310 if (Diagnose) { 4311 if (Field) { 4312 S.Diag(Field->getLocation(), 4313 diag::note_deleted_special_member_class_subobject) 4314 << CSM << MD->getParent() << /*IsField*/true 4315 << Field << DiagKind << IsDtorCallInCtor; 4316 } else { 4317 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4318 S.Diag(Base->getLocStart(), 4319 diag::note_deleted_special_member_class_subobject) 4320 << CSM << MD->getParent() << /*IsField*/false 4321 << Base->getType() << DiagKind << IsDtorCallInCtor; 4322 } 4323 4324 if (DiagKind == 1) 4325 S.NoteDeletedFunction(Decl); 4326 // FIXME: Explain inaccessibility if DiagKind == 3. 4327 } 4328 4329 return true; 4330} 4331 4332/// Check whether we should delete a special member function due to having a 4333/// direct or virtual base class or static data member of class type M. 4334bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4335 CXXRecordDecl *Class, Subobject Subobj) { 4336 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4337 4338 // C++11 [class.ctor]p5: 4339 // -- any direct or virtual base class, or non-static data member with no 4340 // brace-or-equal-initializer, has class type M (or array thereof) and 4341 // either M has no default constructor or overload resolution as applied 4342 // to M's default constructor results in an ambiguity or in a function 4343 // that is deleted or inaccessible 4344 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4345 // -- a direct or virtual base class B that cannot be copied/moved because 4346 // overload resolution, as applied to B's corresponding special member, 4347 // results in an ambiguity or a function that is deleted or inaccessible 4348 // from the defaulted special member 4349 // C++11 [class.dtor]p5: 4350 // -- any direct or virtual base class [...] has a type with a destructor 4351 // that is deleted or inaccessible 4352 if (!(CSM == Sema::CXXDefaultConstructor && 4353 Field && Field->hasInClassInitializer()) && 4354 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class), false)) 4355 return true; 4356 4357 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4358 // -- any direct or virtual base class or non-static data member has a 4359 // type with a destructor that is deleted or inaccessible 4360 if (IsConstructor) { 4361 Sema::SpecialMemberOverloadResult *SMOR = 4362 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4363 false, false, false, false, false); 4364 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4365 return true; 4366 } 4367 4368 return false; 4369} 4370 4371/// Check whether we should delete a special member function due to the class 4372/// having a particular direct or virtual base class. 4373bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4374 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4375 return shouldDeleteForClassSubobject(BaseClass, Base); 4376} 4377 4378/// Check whether we should delete a special member function due to the class 4379/// having a particular non-static data member. 4380bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4381 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4382 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4383 4384 if (CSM == Sema::CXXDefaultConstructor) { 4385 // For a default constructor, all references must be initialized in-class 4386 // and, if a union, it must have a non-const member. 4387 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4388 if (Diagnose) 4389 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4390 << MD->getParent() << FD << FieldType << /*Reference*/0; 4391 return true; 4392 } 4393 // C++11 [class.ctor]p5: any non-variant non-static data member of 4394 // const-qualified type (or array thereof) with no 4395 // brace-or-equal-initializer does not have a user-provided default 4396 // constructor. 4397 if (!inUnion() && FieldType.isConstQualified() && 4398 !FD->hasInClassInitializer() && 4399 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4400 if (Diagnose) 4401 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4402 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4403 return true; 4404 } 4405 4406 if (inUnion() && !FieldType.isConstQualified()) 4407 AllFieldsAreConst = false; 4408 } else if (CSM == Sema::CXXCopyConstructor) { 4409 // For a copy constructor, data members must not be of rvalue reference 4410 // type. 4411 if (FieldType->isRValueReferenceType()) { 4412 if (Diagnose) 4413 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4414 << MD->getParent() << FD << FieldType; 4415 return true; 4416 } 4417 } else if (IsAssignment) { 4418 // For an assignment operator, data members must not be of reference type. 4419 if (FieldType->isReferenceType()) { 4420 if (Diagnose) 4421 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4422 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4423 return true; 4424 } 4425 if (!FieldRecord && FieldType.isConstQualified()) { 4426 // C++11 [class.copy]p23: 4427 // -- a non-static data member of const non-class type (or array thereof) 4428 if (Diagnose) 4429 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4430 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4431 return true; 4432 } 4433 } 4434 4435 if (FieldRecord) { 4436 // Some additional restrictions exist on the variant members. 4437 if (!inUnion() && FieldRecord->isUnion() && 4438 FieldRecord->isAnonymousStructOrUnion()) { 4439 bool AllVariantFieldsAreConst = true; 4440 4441 // FIXME: Handle anonymous unions declared within anonymous unions. 4442 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4443 UE = FieldRecord->field_end(); 4444 UI != UE; ++UI) { 4445 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4446 4447 if (!UnionFieldType.isConstQualified()) 4448 AllVariantFieldsAreConst = false; 4449 4450 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4451 if (UnionFieldRecord && 4452 shouldDeleteForClassSubobject(UnionFieldRecord, *UI)) 4453 return true; 4454 } 4455 4456 // At least one member in each anonymous union must be non-const 4457 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4458 FieldRecord->field_begin() != FieldRecord->field_end()) { 4459 if (Diagnose) 4460 S.Diag(FieldRecord->getLocation(), 4461 diag::note_deleted_default_ctor_all_const) 4462 << MD->getParent() << /*anonymous union*/1; 4463 return true; 4464 } 4465 4466 // Don't check the implicit member of the anonymous union type. 4467 // This is technically non-conformant, but sanity demands it. 4468 return false; 4469 } 4470 4471 if (shouldDeleteForClassSubobject(FieldRecord, FD)) 4472 return true; 4473 } 4474 4475 return false; 4476} 4477 4478/// C++11 [class.ctor] p5: 4479/// A defaulted default constructor for a class X is defined as deleted if 4480/// X is a union and all of its variant members are of const-qualified type. 4481bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4482 // This is a silly definition, because it gives an empty union a deleted 4483 // default constructor. Don't do that. 4484 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4485 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4486 if (Diagnose) 4487 S.Diag(MD->getParent()->getLocation(), 4488 diag::note_deleted_default_ctor_all_const) 4489 << MD->getParent() << /*not anonymous union*/0; 4490 return true; 4491 } 4492 return false; 4493} 4494 4495/// Determine whether a defaulted special member function should be defined as 4496/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4497/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4498bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4499 bool Diagnose) { 4500 assert(!MD->isInvalidDecl()); 4501 CXXRecordDecl *RD = MD->getParent(); 4502 assert(!RD->isDependentType() && "do deletion after instantiation"); 4503 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4504 return false; 4505 4506 // C++11 [expr.lambda.prim]p19: 4507 // The closure type associated with a lambda-expression has a 4508 // deleted (8.4.3) default constructor and a deleted copy 4509 // assignment operator. 4510 if (RD->isLambda() && 4511 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4512 if (Diagnose) 4513 Diag(RD->getLocation(), diag::note_lambda_decl); 4514 return true; 4515 } 4516 4517 // For an anonymous struct or union, the copy and assignment special members 4518 // will never be used, so skip the check. For an anonymous union declared at 4519 // namespace scope, the constructor and destructor are used. 4520 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4521 RD->isAnonymousStructOrUnion()) 4522 return false; 4523 4524 // C++11 [class.copy]p7, p18: 4525 // If the class definition declares a move constructor or move assignment 4526 // operator, an implicitly declared copy constructor or copy assignment 4527 // operator is defined as deleted. 4528 if (MD->isImplicit() && 4529 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4530 CXXMethodDecl *UserDeclaredMove = 0; 4531 4532 // In Microsoft mode, a user-declared move only causes the deletion of the 4533 // corresponding copy operation, not both copy operations. 4534 if (RD->hasUserDeclaredMoveConstructor() && 4535 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4536 if (!Diagnose) return true; 4537 UserDeclaredMove = RD->getMoveConstructor(); 4538 assert(UserDeclaredMove); 4539 } else if (RD->hasUserDeclaredMoveAssignment() && 4540 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4541 if (!Diagnose) return true; 4542 UserDeclaredMove = RD->getMoveAssignmentOperator(); 4543 assert(UserDeclaredMove); 4544 } 4545 4546 if (UserDeclaredMove) { 4547 Diag(UserDeclaredMove->getLocation(), 4548 diag::note_deleted_copy_user_declared_move) 4549 << (CSM == CXXCopyAssignment) << RD 4550 << UserDeclaredMove->isMoveAssignmentOperator(); 4551 return true; 4552 } 4553 } 4554 4555 // Do access control from the special member function 4556 ContextRAII MethodContext(*this, MD); 4557 4558 // C++11 [class.dtor]p5: 4559 // -- for a virtual destructor, lookup of the non-array deallocation function 4560 // results in an ambiguity or in a function that is deleted or inaccessible 4561 if (CSM == CXXDestructor && MD->isVirtual()) { 4562 FunctionDecl *OperatorDelete = 0; 4563 DeclarationName Name = 4564 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4565 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4566 OperatorDelete, false)) { 4567 if (Diagnose) 4568 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4569 return true; 4570 } 4571 } 4572 4573 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4574 4575 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4576 BE = RD->bases_end(); BI != BE; ++BI) 4577 if (!BI->isVirtual() && 4578 SMI.shouldDeleteForBase(BI)) 4579 return true; 4580 4581 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4582 BE = RD->vbases_end(); BI != BE; ++BI) 4583 if (SMI.shouldDeleteForBase(BI)) 4584 return true; 4585 4586 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4587 FE = RD->field_end(); FI != FE; ++FI) 4588 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4589 SMI.shouldDeleteForField(*FI)) 4590 return true; 4591 4592 if (SMI.shouldDeleteForAllConstMembers()) 4593 return true; 4594 4595 return false; 4596} 4597 4598/// \brief Data used with FindHiddenVirtualMethod 4599namespace { 4600 struct FindHiddenVirtualMethodData { 4601 Sema *S; 4602 CXXMethodDecl *Method; 4603 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4604 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4605 }; 4606} 4607 4608/// \brief Member lookup function that determines whether a given C++ 4609/// method overloads virtual methods in a base class without overriding any, 4610/// to be used with CXXRecordDecl::lookupInBases(). 4611static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4612 CXXBasePath &Path, 4613 void *UserData) { 4614 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4615 4616 FindHiddenVirtualMethodData &Data 4617 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4618 4619 DeclarationName Name = Data.Method->getDeclName(); 4620 assert(Name.getNameKind() == DeclarationName::Identifier); 4621 4622 bool foundSameNameMethod = false; 4623 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4624 for (Path.Decls = BaseRecord->lookup(Name); 4625 Path.Decls.first != Path.Decls.second; 4626 ++Path.Decls.first) { 4627 NamedDecl *D = *Path.Decls.first; 4628 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4629 MD = MD->getCanonicalDecl(); 4630 foundSameNameMethod = true; 4631 // Interested only in hidden virtual methods. 4632 if (!MD->isVirtual()) 4633 continue; 4634 // If the method we are checking overrides a method from its base 4635 // don't warn about the other overloaded methods. 4636 if (!Data.S->IsOverload(Data.Method, MD, false)) 4637 return true; 4638 // Collect the overload only if its hidden. 4639 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4640 overloadedMethods.push_back(MD); 4641 } 4642 } 4643 4644 if (foundSameNameMethod) 4645 Data.OverloadedMethods.append(overloadedMethods.begin(), 4646 overloadedMethods.end()); 4647 return foundSameNameMethod; 4648} 4649 4650/// \brief See if a method overloads virtual methods in a base class without 4651/// overriding any. 4652void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4653 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4654 MD->getLocation()) == DiagnosticsEngine::Ignored) 4655 return; 4656 if (!MD->getDeclName().isIdentifier()) 4657 return; 4658 4659 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4660 /*bool RecordPaths=*/false, 4661 /*bool DetectVirtual=*/false); 4662 FindHiddenVirtualMethodData Data; 4663 Data.Method = MD; 4664 Data.S = this; 4665 4666 // Keep the base methods that were overriden or introduced in the subclass 4667 // by 'using' in a set. A base method not in this set is hidden. 4668 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4669 res.first != res.second; ++res.first) { 4670 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4671 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4672 E = MD->end_overridden_methods(); 4673 I != E; ++I) 4674 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4675 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4676 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4677 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4678 } 4679 4680 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4681 !Data.OverloadedMethods.empty()) { 4682 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4683 << MD << (Data.OverloadedMethods.size() > 1); 4684 4685 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4686 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4687 Diag(overloadedMD->getLocation(), 4688 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4689 } 4690 } 4691} 4692 4693void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4694 Decl *TagDecl, 4695 SourceLocation LBrac, 4696 SourceLocation RBrac, 4697 AttributeList *AttrList) { 4698 if (!TagDecl) 4699 return; 4700 4701 AdjustDeclIfTemplate(TagDecl); 4702 4703 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4704 // strict aliasing violation! 4705 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4706 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4707 4708 CheckCompletedCXXClass( 4709 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4710} 4711 4712/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4713/// special functions, such as the default constructor, copy 4714/// constructor, or destructor, to the given C++ class (C++ 4715/// [special]p1). This routine can only be executed just before the 4716/// definition of the class is complete. 4717void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4718 if (!ClassDecl->hasUserDeclaredConstructor()) 4719 ++ASTContext::NumImplicitDefaultConstructors; 4720 4721 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4722 ++ASTContext::NumImplicitCopyConstructors; 4723 4724 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4725 ++ASTContext::NumImplicitMoveConstructors; 4726 4727 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4728 ++ASTContext::NumImplicitCopyAssignmentOperators; 4729 4730 // If we have a dynamic class, then the copy assignment operator may be 4731 // virtual, so we have to declare it immediately. This ensures that, e.g., 4732 // it shows up in the right place in the vtable and that we diagnose 4733 // problems with the implicit exception specification. 4734 if (ClassDecl->isDynamicClass()) 4735 DeclareImplicitCopyAssignment(ClassDecl); 4736 } 4737 4738 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()) { 4739 ++ASTContext::NumImplicitMoveAssignmentOperators; 4740 4741 // Likewise for the move assignment operator. 4742 if (ClassDecl->isDynamicClass()) 4743 DeclareImplicitMoveAssignment(ClassDecl); 4744 } 4745 4746 if (!ClassDecl->hasUserDeclaredDestructor()) { 4747 ++ASTContext::NumImplicitDestructors; 4748 4749 // If we have a dynamic class, then the destructor may be virtual, so we 4750 // have to declare the destructor immediately. This ensures that, e.g., it 4751 // shows up in the right place in the vtable and that we diagnose problems 4752 // with the implicit exception specification. 4753 if (ClassDecl->isDynamicClass()) 4754 DeclareImplicitDestructor(ClassDecl); 4755 } 4756} 4757 4758void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4759 if (!D) 4760 return; 4761 4762 int NumParamList = D->getNumTemplateParameterLists(); 4763 for (int i = 0; i < NumParamList; i++) { 4764 TemplateParameterList* Params = D->getTemplateParameterList(i); 4765 for (TemplateParameterList::iterator Param = Params->begin(), 4766 ParamEnd = Params->end(); 4767 Param != ParamEnd; ++Param) { 4768 NamedDecl *Named = cast<NamedDecl>(*Param); 4769 if (Named->getDeclName()) { 4770 S->AddDecl(Named); 4771 IdResolver.AddDecl(Named); 4772 } 4773 } 4774 } 4775} 4776 4777void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4778 if (!D) 4779 return; 4780 4781 TemplateParameterList *Params = 0; 4782 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4783 Params = Template->getTemplateParameters(); 4784 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4785 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4786 Params = PartialSpec->getTemplateParameters(); 4787 else 4788 return; 4789 4790 for (TemplateParameterList::iterator Param = Params->begin(), 4791 ParamEnd = Params->end(); 4792 Param != ParamEnd; ++Param) { 4793 NamedDecl *Named = cast<NamedDecl>(*Param); 4794 if (Named->getDeclName()) { 4795 S->AddDecl(Named); 4796 IdResolver.AddDecl(Named); 4797 } 4798 } 4799} 4800 4801void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4802 if (!RecordD) return; 4803 AdjustDeclIfTemplate(RecordD); 4804 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4805 PushDeclContext(S, Record); 4806} 4807 4808void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4809 if (!RecordD) return; 4810 PopDeclContext(); 4811} 4812 4813/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4814/// parsing a top-level (non-nested) C++ class, and we are now 4815/// parsing those parts of the given Method declaration that could 4816/// not be parsed earlier (C++ [class.mem]p2), such as default 4817/// arguments. This action should enter the scope of the given 4818/// Method declaration as if we had just parsed the qualified method 4819/// name. However, it should not bring the parameters into scope; 4820/// that will be performed by ActOnDelayedCXXMethodParameter. 4821void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4822} 4823 4824/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4825/// C++ method declaration. We're (re-)introducing the given 4826/// function parameter into scope for use in parsing later parts of 4827/// the method declaration. For example, we could see an 4828/// ActOnParamDefaultArgument event for this parameter. 4829void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4830 if (!ParamD) 4831 return; 4832 4833 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4834 4835 // If this parameter has an unparsed default argument, clear it out 4836 // to make way for the parsed default argument. 4837 if (Param->hasUnparsedDefaultArg()) 4838 Param->setDefaultArg(0); 4839 4840 S->AddDecl(Param); 4841 if (Param->getDeclName()) 4842 IdResolver.AddDecl(Param); 4843} 4844 4845/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4846/// processing the delayed method declaration for Method. The method 4847/// declaration is now considered finished. There may be a separate 4848/// ActOnStartOfFunctionDef action later (not necessarily 4849/// immediately!) for this method, if it was also defined inside the 4850/// class body. 4851void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4852 if (!MethodD) 4853 return; 4854 4855 AdjustDeclIfTemplate(MethodD); 4856 4857 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4858 4859 // Now that we have our default arguments, check the constructor 4860 // again. It could produce additional diagnostics or affect whether 4861 // the class has implicitly-declared destructors, among other 4862 // things. 4863 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4864 CheckConstructor(Constructor); 4865 4866 // Check the default arguments, which we may have added. 4867 if (!Method->isInvalidDecl()) 4868 CheckCXXDefaultArguments(Method); 4869} 4870 4871/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4872/// the well-formedness of the constructor declarator @p D with type @p 4873/// R. If there are any errors in the declarator, this routine will 4874/// emit diagnostics and set the invalid bit to true. In any case, the type 4875/// will be updated to reflect a well-formed type for the constructor and 4876/// returned. 4877QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4878 StorageClass &SC) { 4879 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4880 4881 // C++ [class.ctor]p3: 4882 // A constructor shall not be virtual (10.3) or static (9.4). A 4883 // constructor can be invoked for a const, volatile or const 4884 // volatile object. A constructor shall not be declared const, 4885 // volatile, or const volatile (9.3.2). 4886 if (isVirtual) { 4887 if (!D.isInvalidType()) 4888 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4889 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4890 << SourceRange(D.getIdentifierLoc()); 4891 D.setInvalidType(); 4892 } 4893 if (SC == SC_Static) { 4894 if (!D.isInvalidType()) 4895 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4896 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4897 << SourceRange(D.getIdentifierLoc()); 4898 D.setInvalidType(); 4899 SC = SC_None; 4900 } 4901 4902 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4903 if (FTI.TypeQuals != 0) { 4904 if (FTI.TypeQuals & Qualifiers::Const) 4905 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4906 << "const" << SourceRange(D.getIdentifierLoc()); 4907 if (FTI.TypeQuals & Qualifiers::Volatile) 4908 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4909 << "volatile" << SourceRange(D.getIdentifierLoc()); 4910 if (FTI.TypeQuals & Qualifiers::Restrict) 4911 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4912 << "restrict" << SourceRange(D.getIdentifierLoc()); 4913 D.setInvalidType(); 4914 } 4915 4916 // C++0x [class.ctor]p4: 4917 // A constructor shall not be declared with a ref-qualifier. 4918 if (FTI.hasRefQualifier()) { 4919 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4920 << FTI.RefQualifierIsLValueRef 4921 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4922 D.setInvalidType(); 4923 } 4924 4925 // Rebuild the function type "R" without any type qualifiers (in 4926 // case any of the errors above fired) and with "void" as the 4927 // return type, since constructors don't have return types. 4928 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4929 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4930 return R; 4931 4932 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4933 EPI.TypeQuals = 0; 4934 EPI.RefQualifier = RQ_None; 4935 4936 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 4937 Proto->getNumArgs(), EPI); 4938} 4939 4940/// CheckConstructor - Checks a fully-formed constructor for 4941/// well-formedness, issuing any diagnostics required. Returns true if 4942/// the constructor declarator is invalid. 4943void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 4944 CXXRecordDecl *ClassDecl 4945 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 4946 if (!ClassDecl) 4947 return Constructor->setInvalidDecl(); 4948 4949 // C++ [class.copy]p3: 4950 // A declaration of a constructor for a class X is ill-formed if 4951 // its first parameter is of type (optionally cv-qualified) X and 4952 // either there are no other parameters or else all other 4953 // parameters have default arguments. 4954 if (!Constructor->isInvalidDecl() && 4955 ((Constructor->getNumParams() == 1) || 4956 (Constructor->getNumParams() > 1 && 4957 Constructor->getParamDecl(1)->hasDefaultArg())) && 4958 Constructor->getTemplateSpecializationKind() 4959 != TSK_ImplicitInstantiation) { 4960 QualType ParamType = Constructor->getParamDecl(0)->getType(); 4961 QualType ClassTy = Context.getTagDeclType(ClassDecl); 4962 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 4963 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 4964 const char *ConstRef 4965 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 4966 : " const &"; 4967 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 4968 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 4969 4970 // FIXME: Rather that making the constructor invalid, we should endeavor 4971 // to fix the type. 4972 Constructor->setInvalidDecl(); 4973 } 4974 } 4975} 4976 4977/// CheckDestructor - Checks a fully-formed destructor definition for 4978/// well-formedness, issuing any diagnostics required. Returns true 4979/// on error. 4980bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 4981 CXXRecordDecl *RD = Destructor->getParent(); 4982 4983 if (Destructor->isVirtual()) { 4984 SourceLocation Loc; 4985 4986 if (!Destructor->isImplicit()) 4987 Loc = Destructor->getLocation(); 4988 else 4989 Loc = RD->getLocation(); 4990 4991 // If we have a virtual destructor, look up the deallocation function 4992 FunctionDecl *OperatorDelete = 0; 4993 DeclarationName Name = 4994 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4995 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 4996 return true; 4997 4998 MarkFunctionReferenced(Loc, OperatorDelete); 4999 5000 Destructor->setOperatorDelete(OperatorDelete); 5001 } 5002 5003 return false; 5004} 5005 5006static inline bool 5007FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5008 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5009 FTI.ArgInfo[0].Param && 5010 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5011} 5012 5013/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5014/// the well-formednes of the destructor declarator @p D with type @p 5015/// R. If there are any errors in the declarator, this routine will 5016/// emit diagnostics and set the declarator to invalid. Even if this happens, 5017/// will be updated to reflect a well-formed type for the destructor and 5018/// returned. 5019QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5020 StorageClass& SC) { 5021 // C++ [class.dtor]p1: 5022 // [...] A typedef-name that names a class is a class-name 5023 // (7.1.3); however, a typedef-name that names a class shall not 5024 // be used as the identifier in the declarator for a destructor 5025 // declaration. 5026 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5027 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5028 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5029 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5030 else if (const TemplateSpecializationType *TST = 5031 DeclaratorType->getAs<TemplateSpecializationType>()) 5032 if (TST->isTypeAlias()) 5033 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5034 << DeclaratorType << 1; 5035 5036 // C++ [class.dtor]p2: 5037 // A destructor is used to destroy objects of its class type. A 5038 // destructor takes no parameters, and no return type can be 5039 // specified for it (not even void). The address of a destructor 5040 // shall not be taken. A destructor shall not be static. A 5041 // destructor can be invoked for a const, volatile or const 5042 // volatile object. A destructor shall not be declared const, 5043 // volatile or const volatile (9.3.2). 5044 if (SC == SC_Static) { 5045 if (!D.isInvalidType()) 5046 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5047 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5048 << SourceRange(D.getIdentifierLoc()) 5049 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5050 5051 SC = SC_None; 5052 } 5053 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5054 // Destructors don't have return types, but the parser will 5055 // happily parse something like: 5056 // 5057 // class X { 5058 // float ~X(); 5059 // }; 5060 // 5061 // The return type will be eliminated later. 5062 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5063 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5064 << SourceRange(D.getIdentifierLoc()); 5065 } 5066 5067 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5068 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5069 if (FTI.TypeQuals & Qualifiers::Const) 5070 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5071 << "const" << SourceRange(D.getIdentifierLoc()); 5072 if (FTI.TypeQuals & Qualifiers::Volatile) 5073 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5074 << "volatile" << SourceRange(D.getIdentifierLoc()); 5075 if (FTI.TypeQuals & Qualifiers::Restrict) 5076 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5077 << "restrict" << SourceRange(D.getIdentifierLoc()); 5078 D.setInvalidType(); 5079 } 5080 5081 // C++0x [class.dtor]p2: 5082 // A destructor shall not be declared with a ref-qualifier. 5083 if (FTI.hasRefQualifier()) { 5084 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5085 << FTI.RefQualifierIsLValueRef 5086 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5087 D.setInvalidType(); 5088 } 5089 5090 // Make sure we don't have any parameters. 5091 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5092 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5093 5094 // Delete the parameters. 5095 FTI.freeArgs(); 5096 D.setInvalidType(); 5097 } 5098 5099 // Make sure the destructor isn't variadic. 5100 if (FTI.isVariadic) { 5101 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5102 D.setInvalidType(); 5103 } 5104 5105 // Rebuild the function type "R" without any type qualifiers or 5106 // parameters (in case any of the errors above fired) and with 5107 // "void" as the return type, since destructors don't have return 5108 // types. 5109 if (!D.isInvalidType()) 5110 return R; 5111 5112 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5113 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5114 EPI.Variadic = false; 5115 EPI.TypeQuals = 0; 5116 EPI.RefQualifier = RQ_None; 5117 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5118} 5119 5120/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5121/// well-formednes of the conversion function declarator @p D with 5122/// type @p R. If there are any errors in the declarator, this routine 5123/// will emit diagnostics and return true. Otherwise, it will return 5124/// false. Either way, the type @p R will be updated to reflect a 5125/// well-formed type for the conversion operator. 5126void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5127 StorageClass& SC) { 5128 // C++ [class.conv.fct]p1: 5129 // Neither parameter types nor return type can be specified. The 5130 // type of a conversion function (8.3.5) is "function taking no 5131 // parameter returning conversion-type-id." 5132 if (SC == SC_Static) { 5133 if (!D.isInvalidType()) 5134 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5135 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5136 << SourceRange(D.getIdentifierLoc()); 5137 D.setInvalidType(); 5138 SC = SC_None; 5139 } 5140 5141 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5142 5143 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5144 // Conversion functions don't have return types, but the parser will 5145 // happily parse something like: 5146 // 5147 // class X { 5148 // float operator bool(); 5149 // }; 5150 // 5151 // The return type will be changed later anyway. 5152 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5153 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5154 << SourceRange(D.getIdentifierLoc()); 5155 D.setInvalidType(); 5156 } 5157 5158 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5159 5160 // Make sure we don't have any parameters. 5161 if (Proto->getNumArgs() > 0) { 5162 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5163 5164 // Delete the parameters. 5165 D.getFunctionTypeInfo().freeArgs(); 5166 D.setInvalidType(); 5167 } else if (Proto->isVariadic()) { 5168 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5169 D.setInvalidType(); 5170 } 5171 5172 // Diagnose "&operator bool()" and other such nonsense. This 5173 // is actually a gcc extension which we don't support. 5174 if (Proto->getResultType() != ConvType) { 5175 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5176 << Proto->getResultType(); 5177 D.setInvalidType(); 5178 ConvType = Proto->getResultType(); 5179 } 5180 5181 // C++ [class.conv.fct]p4: 5182 // The conversion-type-id shall not represent a function type nor 5183 // an array type. 5184 if (ConvType->isArrayType()) { 5185 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5186 ConvType = Context.getPointerType(ConvType); 5187 D.setInvalidType(); 5188 } else if (ConvType->isFunctionType()) { 5189 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5190 ConvType = Context.getPointerType(ConvType); 5191 D.setInvalidType(); 5192 } 5193 5194 // Rebuild the function type "R" without any parameters (in case any 5195 // of the errors above fired) and with the conversion type as the 5196 // return type. 5197 if (D.isInvalidType()) 5198 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5199 5200 // C++0x explicit conversion operators. 5201 if (D.getDeclSpec().isExplicitSpecified()) 5202 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5203 getLangOpts().CPlusPlus0x ? 5204 diag::warn_cxx98_compat_explicit_conversion_functions : 5205 diag::ext_explicit_conversion_functions) 5206 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5207} 5208 5209/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5210/// the declaration of the given C++ conversion function. This routine 5211/// is responsible for recording the conversion function in the C++ 5212/// class, if possible. 5213Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5214 assert(Conversion && "Expected to receive a conversion function declaration"); 5215 5216 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5217 5218 // Make sure we aren't redeclaring the conversion function. 5219 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5220 5221 // C++ [class.conv.fct]p1: 5222 // [...] A conversion function is never used to convert a 5223 // (possibly cv-qualified) object to the (possibly cv-qualified) 5224 // same object type (or a reference to it), to a (possibly 5225 // cv-qualified) base class of that type (or a reference to it), 5226 // or to (possibly cv-qualified) void. 5227 // FIXME: Suppress this warning if the conversion function ends up being a 5228 // virtual function that overrides a virtual function in a base class. 5229 QualType ClassType 5230 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5231 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5232 ConvType = ConvTypeRef->getPointeeType(); 5233 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5234 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5235 /* Suppress diagnostics for instantiations. */; 5236 else if (ConvType->isRecordType()) { 5237 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5238 if (ConvType == ClassType) 5239 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5240 << ClassType; 5241 else if (IsDerivedFrom(ClassType, ConvType)) 5242 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5243 << ClassType << ConvType; 5244 } else if (ConvType->isVoidType()) { 5245 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5246 << ClassType << ConvType; 5247 } 5248 5249 if (FunctionTemplateDecl *ConversionTemplate 5250 = Conversion->getDescribedFunctionTemplate()) 5251 return ConversionTemplate; 5252 5253 return Conversion; 5254} 5255 5256//===----------------------------------------------------------------------===// 5257// Namespace Handling 5258//===----------------------------------------------------------------------===// 5259 5260 5261 5262/// ActOnStartNamespaceDef - This is called at the start of a namespace 5263/// definition. 5264Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5265 SourceLocation InlineLoc, 5266 SourceLocation NamespaceLoc, 5267 SourceLocation IdentLoc, 5268 IdentifierInfo *II, 5269 SourceLocation LBrace, 5270 AttributeList *AttrList) { 5271 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5272 // For anonymous namespace, take the location of the left brace. 5273 SourceLocation Loc = II ? IdentLoc : LBrace; 5274 bool IsInline = InlineLoc.isValid(); 5275 bool IsInvalid = false; 5276 bool IsStd = false; 5277 bool AddToKnown = false; 5278 Scope *DeclRegionScope = NamespcScope->getParent(); 5279 5280 NamespaceDecl *PrevNS = 0; 5281 if (II) { 5282 // C++ [namespace.def]p2: 5283 // The identifier in an original-namespace-definition shall not 5284 // have been previously defined in the declarative region in 5285 // which the original-namespace-definition appears. The 5286 // identifier in an original-namespace-definition is the name of 5287 // the namespace. Subsequently in that declarative region, it is 5288 // treated as an original-namespace-name. 5289 // 5290 // Since namespace names are unique in their scope, and we don't 5291 // look through using directives, just look for any ordinary names. 5292 5293 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5294 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5295 Decl::IDNS_Namespace; 5296 NamedDecl *PrevDecl = 0; 5297 for (DeclContext::lookup_result R 5298 = CurContext->getRedeclContext()->lookup(II); 5299 R.first != R.second; ++R.first) { 5300 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5301 PrevDecl = *R.first; 5302 break; 5303 } 5304 } 5305 5306 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5307 5308 if (PrevNS) { 5309 // This is an extended namespace definition. 5310 if (IsInline != PrevNS->isInline()) { 5311 // inline-ness must match 5312 if (PrevNS->isInline()) { 5313 // The user probably just forgot the 'inline', so suggest that it 5314 // be added back. 5315 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5316 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5317 } else { 5318 Diag(Loc, diag::err_inline_namespace_mismatch) 5319 << IsInline; 5320 } 5321 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5322 5323 IsInline = PrevNS->isInline(); 5324 } 5325 } else if (PrevDecl) { 5326 // This is an invalid name redefinition. 5327 Diag(Loc, diag::err_redefinition_different_kind) 5328 << II; 5329 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5330 IsInvalid = true; 5331 // Continue on to push Namespc as current DeclContext and return it. 5332 } else if (II->isStr("std") && 5333 CurContext->getRedeclContext()->isTranslationUnit()) { 5334 // This is the first "real" definition of the namespace "std", so update 5335 // our cache of the "std" namespace to point at this definition. 5336 PrevNS = getStdNamespace(); 5337 IsStd = true; 5338 AddToKnown = !IsInline; 5339 } else { 5340 // We've seen this namespace for the first time. 5341 AddToKnown = !IsInline; 5342 } 5343 } else { 5344 // Anonymous namespaces. 5345 5346 // Determine whether the parent already has an anonymous namespace. 5347 DeclContext *Parent = CurContext->getRedeclContext(); 5348 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5349 PrevNS = TU->getAnonymousNamespace(); 5350 } else { 5351 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5352 PrevNS = ND->getAnonymousNamespace(); 5353 } 5354 5355 if (PrevNS && IsInline != PrevNS->isInline()) { 5356 // inline-ness must match 5357 Diag(Loc, diag::err_inline_namespace_mismatch) 5358 << IsInline; 5359 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5360 5361 // Recover by ignoring the new namespace's inline status. 5362 IsInline = PrevNS->isInline(); 5363 } 5364 } 5365 5366 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5367 StartLoc, Loc, II, PrevNS); 5368 if (IsInvalid) 5369 Namespc->setInvalidDecl(); 5370 5371 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5372 5373 // FIXME: Should we be merging attributes? 5374 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5375 PushNamespaceVisibilityAttr(Attr, Loc); 5376 5377 if (IsStd) 5378 StdNamespace = Namespc; 5379 if (AddToKnown) 5380 KnownNamespaces[Namespc] = false; 5381 5382 if (II) { 5383 PushOnScopeChains(Namespc, DeclRegionScope); 5384 } else { 5385 // Link the anonymous namespace into its parent. 5386 DeclContext *Parent = CurContext->getRedeclContext(); 5387 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5388 TU->setAnonymousNamespace(Namespc); 5389 } else { 5390 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5391 } 5392 5393 CurContext->addDecl(Namespc); 5394 5395 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5396 // behaves as if it were replaced by 5397 // namespace unique { /* empty body */ } 5398 // using namespace unique; 5399 // namespace unique { namespace-body } 5400 // where all occurrences of 'unique' in a translation unit are 5401 // replaced by the same identifier and this identifier differs 5402 // from all other identifiers in the entire program. 5403 5404 // We just create the namespace with an empty name and then add an 5405 // implicit using declaration, just like the standard suggests. 5406 // 5407 // CodeGen enforces the "universally unique" aspect by giving all 5408 // declarations semantically contained within an anonymous 5409 // namespace internal linkage. 5410 5411 if (!PrevNS) { 5412 UsingDirectiveDecl* UD 5413 = UsingDirectiveDecl::Create(Context, CurContext, 5414 /* 'using' */ LBrace, 5415 /* 'namespace' */ SourceLocation(), 5416 /* qualifier */ NestedNameSpecifierLoc(), 5417 /* identifier */ SourceLocation(), 5418 Namespc, 5419 /* Ancestor */ CurContext); 5420 UD->setImplicit(); 5421 CurContext->addDecl(UD); 5422 } 5423 } 5424 5425 ActOnDocumentableDecl(Namespc); 5426 5427 // Although we could have an invalid decl (i.e. the namespace name is a 5428 // redefinition), push it as current DeclContext and try to continue parsing. 5429 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5430 // for the namespace has the declarations that showed up in that particular 5431 // namespace definition. 5432 PushDeclContext(NamespcScope, Namespc); 5433 return Namespc; 5434} 5435 5436/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5437/// is a namespace alias, returns the namespace it points to. 5438static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5439 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5440 return AD->getNamespace(); 5441 return dyn_cast_or_null<NamespaceDecl>(D); 5442} 5443 5444/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5445/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5446void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5447 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5448 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5449 Namespc->setRBraceLoc(RBrace); 5450 PopDeclContext(); 5451 if (Namespc->hasAttr<VisibilityAttr>()) 5452 PopPragmaVisibility(true, RBrace); 5453} 5454 5455CXXRecordDecl *Sema::getStdBadAlloc() const { 5456 return cast_or_null<CXXRecordDecl>( 5457 StdBadAlloc.get(Context.getExternalSource())); 5458} 5459 5460NamespaceDecl *Sema::getStdNamespace() const { 5461 return cast_or_null<NamespaceDecl>( 5462 StdNamespace.get(Context.getExternalSource())); 5463} 5464 5465/// \brief Retrieve the special "std" namespace, which may require us to 5466/// implicitly define the namespace. 5467NamespaceDecl *Sema::getOrCreateStdNamespace() { 5468 if (!StdNamespace) { 5469 // The "std" namespace has not yet been defined, so build one implicitly. 5470 StdNamespace = NamespaceDecl::Create(Context, 5471 Context.getTranslationUnitDecl(), 5472 /*Inline=*/false, 5473 SourceLocation(), SourceLocation(), 5474 &PP.getIdentifierTable().get("std"), 5475 /*PrevDecl=*/0); 5476 getStdNamespace()->setImplicit(true); 5477 } 5478 5479 return getStdNamespace(); 5480} 5481 5482bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5483 assert(getLangOpts().CPlusPlus && 5484 "Looking for std::initializer_list outside of C++."); 5485 5486 // We're looking for implicit instantiations of 5487 // template <typename E> class std::initializer_list. 5488 5489 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5490 return false; 5491 5492 ClassTemplateDecl *Template = 0; 5493 const TemplateArgument *Arguments = 0; 5494 5495 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5496 5497 ClassTemplateSpecializationDecl *Specialization = 5498 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5499 if (!Specialization) 5500 return false; 5501 5502 Template = Specialization->getSpecializedTemplate(); 5503 Arguments = Specialization->getTemplateArgs().data(); 5504 } else if (const TemplateSpecializationType *TST = 5505 Ty->getAs<TemplateSpecializationType>()) { 5506 Template = dyn_cast_or_null<ClassTemplateDecl>( 5507 TST->getTemplateName().getAsTemplateDecl()); 5508 Arguments = TST->getArgs(); 5509 } 5510 if (!Template) 5511 return false; 5512 5513 if (!StdInitializerList) { 5514 // Haven't recognized std::initializer_list yet, maybe this is it. 5515 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5516 if (TemplateClass->getIdentifier() != 5517 &PP.getIdentifierTable().get("initializer_list") || 5518 !getStdNamespace()->InEnclosingNamespaceSetOf( 5519 TemplateClass->getDeclContext())) 5520 return false; 5521 // This is a template called std::initializer_list, but is it the right 5522 // template? 5523 TemplateParameterList *Params = Template->getTemplateParameters(); 5524 if (Params->getMinRequiredArguments() != 1) 5525 return false; 5526 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5527 return false; 5528 5529 // It's the right template. 5530 StdInitializerList = Template; 5531 } 5532 5533 if (Template != StdInitializerList) 5534 return false; 5535 5536 // This is an instance of std::initializer_list. Find the argument type. 5537 if (Element) 5538 *Element = Arguments[0].getAsType(); 5539 return true; 5540} 5541 5542static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5543 NamespaceDecl *Std = S.getStdNamespace(); 5544 if (!Std) { 5545 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5546 return 0; 5547 } 5548 5549 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5550 Loc, Sema::LookupOrdinaryName); 5551 if (!S.LookupQualifiedName(Result, Std)) { 5552 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5553 return 0; 5554 } 5555 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5556 if (!Template) { 5557 Result.suppressDiagnostics(); 5558 // We found something weird. Complain about the first thing we found. 5559 NamedDecl *Found = *Result.begin(); 5560 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5561 return 0; 5562 } 5563 5564 // We found some template called std::initializer_list. Now verify that it's 5565 // correct. 5566 TemplateParameterList *Params = Template->getTemplateParameters(); 5567 if (Params->getMinRequiredArguments() != 1 || 5568 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5569 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5570 return 0; 5571 } 5572 5573 return Template; 5574} 5575 5576QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5577 if (!StdInitializerList) { 5578 StdInitializerList = LookupStdInitializerList(*this, Loc); 5579 if (!StdInitializerList) 5580 return QualType(); 5581 } 5582 5583 TemplateArgumentListInfo Args(Loc, Loc); 5584 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5585 Context.getTrivialTypeSourceInfo(Element, 5586 Loc))); 5587 return Context.getCanonicalType( 5588 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5589} 5590 5591bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5592 // C++ [dcl.init.list]p2: 5593 // A constructor is an initializer-list constructor if its first parameter 5594 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5595 // std::initializer_list<E> for some type E, and either there are no other 5596 // parameters or else all other parameters have default arguments. 5597 if (Ctor->getNumParams() < 1 || 5598 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5599 return false; 5600 5601 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5602 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5603 ArgType = RT->getPointeeType().getUnqualifiedType(); 5604 5605 return isStdInitializerList(ArgType, 0); 5606} 5607 5608/// \brief Determine whether a using statement is in a context where it will be 5609/// apply in all contexts. 5610static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5611 switch (CurContext->getDeclKind()) { 5612 case Decl::TranslationUnit: 5613 return true; 5614 case Decl::LinkageSpec: 5615 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5616 default: 5617 return false; 5618 } 5619} 5620 5621namespace { 5622 5623// Callback to only accept typo corrections that are namespaces. 5624class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5625 public: 5626 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5627 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5628 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5629 } 5630 return false; 5631 } 5632}; 5633 5634} 5635 5636static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5637 CXXScopeSpec &SS, 5638 SourceLocation IdentLoc, 5639 IdentifierInfo *Ident) { 5640 NamespaceValidatorCCC Validator; 5641 R.clear(); 5642 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5643 R.getLookupKind(), Sc, &SS, 5644 Validator)) { 5645 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 5646 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 5647 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5648 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5649 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5650 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5651 else 5652 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5653 << Ident << CorrectedQuotedStr 5654 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5655 5656 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5657 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5658 5659 R.addDecl(Corrected.getCorrectionDecl()); 5660 return true; 5661 } 5662 return false; 5663} 5664 5665Decl *Sema::ActOnUsingDirective(Scope *S, 5666 SourceLocation UsingLoc, 5667 SourceLocation NamespcLoc, 5668 CXXScopeSpec &SS, 5669 SourceLocation IdentLoc, 5670 IdentifierInfo *NamespcName, 5671 AttributeList *AttrList) { 5672 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5673 assert(NamespcName && "Invalid NamespcName."); 5674 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5675 5676 // This can only happen along a recovery path. 5677 while (S->getFlags() & Scope::TemplateParamScope) 5678 S = S->getParent(); 5679 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5680 5681 UsingDirectiveDecl *UDir = 0; 5682 NestedNameSpecifier *Qualifier = 0; 5683 if (SS.isSet()) 5684 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5685 5686 // Lookup namespace name. 5687 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5688 LookupParsedName(R, S, &SS); 5689 if (R.isAmbiguous()) 5690 return 0; 5691 5692 if (R.empty()) { 5693 R.clear(); 5694 // Allow "using namespace std;" or "using namespace ::std;" even if 5695 // "std" hasn't been defined yet, for GCC compatibility. 5696 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5697 NamespcName->isStr("std")) { 5698 Diag(IdentLoc, diag::ext_using_undefined_std); 5699 R.addDecl(getOrCreateStdNamespace()); 5700 R.resolveKind(); 5701 } 5702 // Otherwise, attempt typo correction. 5703 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5704 } 5705 5706 if (!R.empty()) { 5707 NamedDecl *Named = R.getFoundDecl(); 5708 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5709 && "expected namespace decl"); 5710 // C++ [namespace.udir]p1: 5711 // A using-directive specifies that the names in the nominated 5712 // namespace can be used in the scope in which the 5713 // using-directive appears after the using-directive. During 5714 // unqualified name lookup (3.4.1), the names appear as if they 5715 // were declared in the nearest enclosing namespace which 5716 // contains both the using-directive and the nominated 5717 // namespace. [Note: in this context, "contains" means "contains 5718 // directly or indirectly". ] 5719 5720 // Find enclosing context containing both using-directive and 5721 // nominated namespace. 5722 NamespaceDecl *NS = getNamespaceDecl(Named); 5723 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5724 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5725 CommonAncestor = CommonAncestor->getParent(); 5726 5727 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5728 SS.getWithLocInContext(Context), 5729 IdentLoc, Named, CommonAncestor); 5730 5731 if (IsUsingDirectiveInToplevelContext(CurContext) && 5732 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5733 Diag(IdentLoc, diag::warn_using_directive_in_header); 5734 } 5735 5736 PushUsingDirective(S, UDir); 5737 } else { 5738 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5739 } 5740 5741 // FIXME: We ignore attributes for now. 5742 return UDir; 5743} 5744 5745void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5746 // If the scope has an associated entity and the using directive is at 5747 // namespace or translation unit scope, add the UsingDirectiveDecl into 5748 // its lookup structure so qualified name lookup can find it. 5749 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 5750 if (Ctx && !Ctx->isFunctionOrMethod()) 5751 Ctx->addDecl(UDir); 5752 else 5753 // Otherwise, it is at block sope. The using-directives will affect lookup 5754 // only to the end of the scope. 5755 S->PushUsingDirective(UDir); 5756} 5757 5758 5759Decl *Sema::ActOnUsingDeclaration(Scope *S, 5760 AccessSpecifier AS, 5761 bool HasUsingKeyword, 5762 SourceLocation UsingLoc, 5763 CXXScopeSpec &SS, 5764 UnqualifiedId &Name, 5765 AttributeList *AttrList, 5766 bool IsTypeName, 5767 SourceLocation TypenameLoc) { 5768 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5769 5770 switch (Name.getKind()) { 5771 case UnqualifiedId::IK_ImplicitSelfParam: 5772 case UnqualifiedId::IK_Identifier: 5773 case UnqualifiedId::IK_OperatorFunctionId: 5774 case UnqualifiedId::IK_LiteralOperatorId: 5775 case UnqualifiedId::IK_ConversionFunctionId: 5776 break; 5777 5778 case UnqualifiedId::IK_ConstructorName: 5779 case UnqualifiedId::IK_ConstructorTemplateId: 5780 // C++11 inheriting constructors. 5781 Diag(Name.getLocStart(), 5782 getLangOpts().CPlusPlus0x ? 5783 // FIXME: Produce warn_cxx98_compat_using_decl_constructor 5784 // instead once inheriting constructors work. 5785 diag::err_using_decl_constructor_unsupported : 5786 diag::err_using_decl_constructor) 5787 << SS.getRange(); 5788 5789 if (getLangOpts().CPlusPlus0x) break; 5790 5791 return 0; 5792 5793 case UnqualifiedId::IK_DestructorName: 5794 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 5795 << SS.getRange(); 5796 return 0; 5797 5798 case UnqualifiedId::IK_TemplateId: 5799 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 5800 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5801 return 0; 5802 } 5803 5804 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5805 DeclarationName TargetName = TargetNameInfo.getName(); 5806 if (!TargetName) 5807 return 0; 5808 5809 // Warn about using declarations. 5810 // TODO: store that the declaration was written without 'using' and 5811 // talk about access decls instead of using decls in the 5812 // diagnostics. 5813 if (!HasUsingKeyword) { 5814 UsingLoc = Name.getLocStart(); 5815 5816 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5817 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5818 } 5819 5820 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5821 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5822 return 0; 5823 5824 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5825 TargetNameInfo, AttrList, 5826 /* IsInstantiation */ false, 5827 IsTypeName, TypenameLoc); 5828 if (UD) 5829 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5830 5831 return UD; 5832} 5833 5834/// \brief Determine whether a using declaration considers the given 5835/// declarations as "equivalent", e.g., if they are redeclarations of 5836/// the same entity or are both typedefs of the same type. 5837static bool 5838IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5839 bool &SuppressRedeclaration) { 5840 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5841 SuppressRedeclaration = false; 5842 return true; 5843 } 5844 5845 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5846 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5847 SuppressRedeclaration = true; 5848 return Context.hasSameType(TD1->getUnderlyingType(), 5849 TD2->getUnderlyingType()); 5850 } 5851 5852 return false; 5853} 5854 5855 5856/// Determines whether to create a using shadow decl for a particular 5857/// decl, given the set of decls existing prior to this using lookup. 5858bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5859 const LookupResult &Previous) { 5860 // Diagnose finding a decl which is not from a base class of the 5861 // current class. We do this now because there are cases where this 5862 // function will silently decide not to build a shadow decl, which 5863 // will pre-empt further diagnostics. 5864 // 5865 // We don't need to do this in C++0x because we do the check once on 5866 // the qualifier. 5867 // 5868 // FIXME: diagnose the following if we care enough: 5869 // struct A { int foo; }; 5870 // struct B : A { using A::foo; }; 5871 // template <class T> struct C : A {}; 5872 // template <class T> struct D : C<T> { using B::foo; } // <--- 5873 // This is invalid (during instantiation) in C++03 because B::foo 5874 // resolves to the using decl in B, which is not a base class of D<T>. 5875 // We can't diagnose it immediately because C<T> is an unknown 5876 // specialization. The UsingShadowDecl in D<T> then points directly 5877 // to A::foo, which will look well-formed when we instantiate. 5878 // The right solution is to not collapse the shadow-decl chain. 5879 if (!getLangOpts().CPlusPlus0x && CurContext->isRecord()) { 5880 DeclContext *OrigDC = Orig->getDeclContext(); 5881 5882 // Handle enums and anonymous structs. 5883 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5884 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5885 while (OrigRec->isAnonymousStructOrUnion()) 5886 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5887 5888 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5889 if (OrigDC == CurContext) { 5890 Diag(Using->getLocation(), 5891 diag::err_using_decl_nested_name_specifier_is_current_class) 5892 << Using->getQualifierLoc().getSourceRange(); 5893 Diag(Orig->getLocation(), diag::note_using_decl_target); 5894 return true; 5895 } 5896 5897 Diag(Using->getQualifierLoc().getBeginLoc(), 5898 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5899 << Using->getQualifier() 5900 << cast<CXXRecordDecl>(CurContext) 5901 << Using->getQualifierLoc().getSourceRange(); 5902 Diag(Orig->getLocation(), diag::note_using_decl_target); 5903 return true; 5904 } 5905 } 5906 5907 if (Previous.empty()) return false; 5908 5909 NamedDecl *Target = Orig; 5910 if (isa<UsingShadowDecl>(Target)) 5911 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5912 5913 // If the target happens to be one of the previous declarations, we 5914 // don't have a conflict. 5915 // 5916 // FIXME: but we might be increasing its access, in which case we 5917 // should redeclare it. 5918 NamedDecl *NonTag = 0, *Tag = 0; 5919 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5920 I != E; ++I) { 5921 NamedDecl *D = (*I)->getUnderlyingDecl(); 5922 bool Result; 5923 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5924 return Result; 5925 5926 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5927 } 5928 5929 if (Target->isFunctionOrFunctionTemplate()) { 5930 FunctionDecl *FD; 5931 if (isa<FunctionTemplateDecl>(Target)) 5932 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5933 else 5934 FD = cast<FunctionDecl>(Target); 5935 5936 NamedDecl *OldDecl = 0; 5937 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5938 case Ovl_Overload: 5939 return false; 5940 5941 case Ovl_NonFunction: 5942 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5943 break; 5944 5945 // We found a decl with the exact signature. 5946 case Ovl_Match: 5947 // If we're in a record, we want to hide the target, so we 5948 // return true (without a diagnostic) to tell the caller not to 5949 // build a shadow decl. 5950 if (CurContext->isRecord()) 5951 return true; 5952 5953 // If we're not in a record, this is an error. 5954 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5955 break; 5956 } 5957 5958 Diag(Target->getLocation(), diag::note_using_decl_target); 5959 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5960 return true; 5961 } 5962 5963 // Target is not a function. 5964 5965 if (isa<TagDecl>(Target)) { 5966 // No conflict between a tag and a non-tag. 5967 if (!Tag) return false; 5968 5969 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5970 Diag(Target->getLocation(), diag::note_using_decl_target); 5971 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5972 return true; 5973 } 5974 5975 // No conflict between a tag and a non-tag. 5976 if (!NonTag) return false; 5977 5978 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5979 Diag(Target->getLocation(), diag::note_using_decl_target); 5980 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5981 return true; 5982} 5983 5984/// Builds a shadow declaration corresponding to a 'using' declaration. 5985UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 5986 UsingDecl *UD, 5987 NamedDecl *Orig) { 5988 5989 // If we resolved to another shadow declaration, just coalesce them. 5990 NamedDecl *Target = Orig; 5991 if (isa<UsingShadowDecl>(Target)) { 5992 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5993 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 5994 } 5995 5996 UsingShadowDecl *Shadow 5997 = UsingShadowDecl::Create(Context, CurContext, 5998 UD->getLocation(), UD, Target); 5999 UD->addShadowDecl(Shadow); 6000 6001 Shadow->setAccess(UD->getAccess()); 6002 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6003 Shadow->setInvalidDecl(); 6004 6005 if (S) 6006 PushOnScopeChains(Shadow, S); 6007 else 6008 CurContext->addDecl(Shadow); 6009 6010 6011 return Shadow; 6012} 6013 6014/// Hides a using shadow declaration. This is required by the current 6015/// using-decl implementation when a resolvable using declaration in a 6016/// class is followed by a declaration which would hide or override 6017/// one or more of the using decl's targets; for example: 6018/// 6019/// struct Base { void foo(int); }; 6020/// struct Derived : Base { 6021/// using Base::foo; 6022/// void foo(int); 6023/// }; 6024/// 6025/// The governing language is C++03 [namespace.udecl]p12: 6026/// 6027/// When a using-declaration brings names from a base class into a 6028/// derived class scope, member functions in the derived class 6029/// override and/or hide member functions with the same name and 6030/// parameter types in a base class (rather than conflicting). 6031/// 6032/// There are two ways to implement this: 6033/// (1) optimistically create shadow decls when they're not hidden 6034/// by existing declarations, or 6035/// (2) don't create any shadow decls (or at least don't make them 6036/// visible) until we've fully parsed/instantiated the class. 6037/// The problem with (1) is that we might have to retroactively remove 6038/// a shadow decl, which requires several O(n) operations because the 6039/// decl structures are (very reasonably) not designed for removal. 6040/// (2) avoids this but is very fiddly and phase-dependent. 6041void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6042 if (Shadow->getDeclName().getNameKind() == 6043 DeclarationName::CXXConversionFunctionName) 6044 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6045 6046 // Remove it from the DeclContext... 6047 Shadow->getDeclContext()->removeDecl(Shadow); 6048 6049 // ...and the scope, if applicable... 6050 if (S) { 6051 S->RemoveDecl(Shadow); 6052 IdResolver.RemoveDecl(Shadow); 6053 } 6054 6055 // ...and the using decl. 6056 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6057 6058 // TODO: complain somehow if Shadow was used. It shouldn't 6059 // be possible for this to happen, because...? 6060} 6061 6062/// Builds a using declaration. 6063/// 6064/// \param IsInstantiation - Whether this call arises from an 6065/// instantiation of an unresolved using declaration. We treat 6066/// the lookup differently for these declarations. 6067NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6068 SourceLocation UsingLoc, 6069 CXXScopeSpec &SS, 6070 const DeclarationNameInfo &NameInfo, 6071 AttributeList *AttrList, 6072 bool IsInstantiation, 6073 bool IsTypeName, 6074 SourceLocation TypenameLoc) { 6075 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6076 SourceLocation IdentLoc = NameInfo.getLoc(); 6077 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6078 6079 // FIXME: We ignore attributes for now. 6080 6081 if (SS.isEmpty()) { 6082 Diag(IdentLoc, diag::err_using_requires_qualname); 6083 return 0; 6084 } 6085 6086 // Do the redeclaration lookup in the current scope. 6087 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6088 ForRedeclaration); 6089 Previous.setHideTags(false); 6090 if (S) { 6091 LookupName(Previous, S); 6092 6093 // It is really dumb that we have to do this. 6094 LookupResult::Filter F = Previous.makeFilter(); 6095 while (F.hasNext()) { 6096 NamedDecl *D = F.next(); 6097 if (!isDeclInScope(D, CurContext, S)) 6098 F.erase(); 6099 } 6100 F.done(); 6101 } else { 6102 assert(IsInstantiation && "no scope in non-instantiation"); 6103 assert(CurContext->isRecord() && "scope not record in instantiation"); 6104 LookupQualifiedName(Previous, CurContext); 6105 } 6106 6107 // Check for invalid redeclarations. 6108 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6109 return 0; 6110 6111 // Check for bad qualifiers. 6112 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6113 return 0; 6114 6115 DeclContext *LookupContext = computeDeclContext(SS); 6116 NamedDecl *D; 6117 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6118 if (!LookupContext) { 6119 if (IsTypeName) { 6120 // FIXME: not all declaration name kinds are legal here 6121 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6122 UsingLoc, TypenameLoc, 6123 QualifierLoc, 6124 IdentLoc, NameInfo.getName()); 6125 } else { 6126 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6127 QualifierLoc, NameInfo); 6128 } 6129 } else { 6130 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6131 NameInfo, IsTypeName); 6132 } 6133 D->setAccess(AS); 6134 CurContext->addDecl(D); 6135 6136 if (!LookupContext) return D; 6137 UsingDecl *UD = cast<UsingDecl>(D); 6138 6139 if (RequireCompleteDeclContext(SS, LookupContext)) { 6140 UD->setInvalidDecl(); 6141 return UD; 6142 } 6143 6144 // The normal rules do not apply to inheriting constructor declarations. 6145 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6146 if (CheckInheritingConstructorUsingDecl(UD)) 6147 UD->setInvalidDecl(); 6148 return UD; 6149 } 6150 6151 // Otherwise, look up the target name. 6152 6153 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6154 6155 // Unlike most lookups, we don't always want to hide tag 6156 // declarations: tag names are visible through the using declaration 6157 // even if hidden by ordinary names, *except* in a dependent context 6158 // where it's important for the sanity of two-phase lookup. 6159 if (!IsInstantiation) 6160 R.setHideTags(false); 6161 6162 // For the purposes of this lookup, we have a base object type 6163 // equal to that of the current context. 6164 if (CurContext->isRecord()) { 6165 R.setBaseObjectType( 6166 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6167 } 6168 6169 LookupQualifiedName(R, LookupContext); 6170 6171 if (R.empty()) { 6172 Diag(IdentLoc, diag::err_no_member) 6173 << NameInfo.getName() << LookupContext << SS.getRange(); 6174 UD->setInvalidDecl(); 6175 return UD; 6176 } 6177 6178 if (R.isAmbiguous()) { 6179 UD->setInvalidDecl(); 6180 return UD; 6181 } 6182 6183 if (IsTypeName) { 6184 // If we asked for a typename and got a non-type decl, error out. 6185 if (!R.getAsSingle<TypeDecl>()) { 6186 Diag(IdentLoc, diag::err_using_typename_non_type); 6187 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6188 Diag((*I)->getUnderlyingDecl()->getLocation(), 6189 diag::note_using_decl_target); 6190 UD->setInvalidDecl(); 6191 return UD; 6192 } 6193 } else { 6194 // If we asked for a non-typename and we got a type, error out, 6195 // but only if this is an instantiation of an unresolved using 6196 // decl. Otherwise just silently find the type name. 6197 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6198 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6199 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6200 UD->setInvalidDecl(); 6201 return UD; 6202 } 6203 } 6204 6205 // C++0x N2914 [namespace.udecl]p6: 6206 // A using-declaration shall not name a namespace. 6207 if (R.getAsSingle<NamespaceDecl>()) { 6208 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6209 << SS.getRange(); 6210 UD->setInvalidDecl(); 6211 return UD; 6212 } 6213 6214 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6215 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6216 BuildUsingShadowDecl(S, UD, *I); 6217 } 6218 6219 return UD; 6220} 6221 6222/// Additional checks for a using declaration referring to a constructor name. 6223bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6224 assert(!UD->isTypeName() && "expecting a constructor name"); 6225 6226 const Type *SourceType = UD->getQualifier()->getAsType(); 6227 assert(SourceType && 6228 "Using decl naming constructor doesn't have type in scope spec."); 6229 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6230 6231 // Check whether the named type is a direct base class. 6232 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6233 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6234 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6235 BaseIt != BaseE; ++BaseIt) { 6236 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6237 if (CanonicalSourceType == BaseType) 6238 break; 6239 if (BaseIt->getType()->isDependentType()) 6240 break; 6241 } 6242 6243 if (BaseIt == BaseE) { 6244 // Did not find SourceType in the bases. 6245 Diag(UD->getUsingLocation(), 6246 diag::err_using_decl_constructor_not_in_direct_base) 6247 << UD->getNameInfo().getSourceRange() 6248 << QualType(SourceType, 0) << TargetClass; 6249 return true; 6250 } 6251 6252 if (!CurContext->isDependentContext()) 6253 BaseIt->setInheritConstructors(); 6254 6255 return false; 6256} 6257 6258/// Checks that the given using declaration is not an invalid 6259/// redeclaration. Note that this is checking only for the using decl 6260/// itself, not for any ill-formedness among the UsingShadowDecls. 6261bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6262 bool isTypeName, 6263 const CXXScopeSpec &SS, 6264 SourceLocation NameLoc, 6265 const LookupResult &Prev) { 6266 // C++03 [namespace.udecl]p8: 6267 // C++0x [namespace.udecl]p10: 6268 // A using-declaration is a declaration and can therefore be used 6269 // repeatedly where (and only where) multiple declarations are 6270 // allowed. 6271 // 6272 // That's in non-member contexts. 6273 if (!CurContext->getRedeclContext()->isRecord()) 6274 return false; 6275 6276 NestedNameSpecifier *Qual 6277 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6278 6279 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6280 NamedDecl *D = *I; 6281 6282 bool DTypename; 6283 NestedNameSpecifier *DQual; 6284 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6285 DTypename = UD->isTypeName(); 6286 DQual = UD->getQualifier(); 6287 } else if (UnresolvedUsingValueDecl *UD 6288 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6289 DTypename = false; 6290 DQual = UD->getQualifier(); 6291 } else if (UnresolvedUsingTypenameDecl *UD 6292 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6293 DTypename = true; 6294 DQual = UD->getQualifier(); 6295 } else continue; 6296 6297 // using decls differ if one says 'typename' and the other doesn't. 6298 // FIXME: non-dependent using decls? 6299 if (isTypeName != DTypename) continue; 6300 6301 // using decls differ if they name different scopes (but note that 6302 // template instantiation can cause this check to trigger when it 6303 // didn't before instantiation). 6304 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6305 Context.getCanonicalNestedNameSpecifier(DQual)) 6306 continue; 6307 6308 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6309 Diag(D->getLocation(), diag::note_using_decl) << 1; 6310 return true; 6311 } 6312 6313 return false; 6314} 6315 6316 6317/// Checks that the given nested-name qualifier used in a using decl 6318/// in the current context is appropriately related to the current 6319/// scope. If an error is found, diagnoses it and returns true. 6320bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6321 const CXXScopeSpec &SS, 6322 SourceLocation NameLoc) { 6323 DeclContext *NamedContext = computeDeclContext(SS); 6324 6325 if (!CurContext->isRecord()) { 6326 // C++03 [namespace.udecl]p3: 6327 // C++0x [namespace.udecl]p8: 6328 // A using-declaration for a class member shall be a member-declaration. 6329 6330 // If we weren't able to compute a valid scope, it must be a 6331 // dependent class scope. 6332 if (!NamedContext || NamedContext->isRecord()) { 6333 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6334 << SS.getRange(); 6335 return true; 6336 } 6337 6338 // Otherwise, everything is known to be fine. 6339 return false; 6340 } 6341 6342 // The current scope is a record. 6343 6344 // If the named context is dependent, we can't decide much. 6345 if (!NamedContext) { 6346 // FIXME: in C++0x, we can diagnose if we can prove that the 6347 // nested-name-specifier does not refer to a base class, which is 6348 // still possible in some cases. 6349 6350 // Otherwise we have to conservatively report that things might be 6351 // okay. 6352 return false; 6353 } 6354 6355 if (!NamedContext->isRecord()) { 6356 // Ideally this would point at the last name in the specifier, 6357 // but we don't have that level of source info. 6358 Diag(SS.getRange().getBegin(), 6359 diag::err_using_decl_nested_name_specifier_is_not_class) 6360 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6361 return true; 6362 } 6363 6364 if (!NamedContext->isDependentContext() && 6365 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6366 return true; 6367 6368 if (getLangOpts().CPlusPlus0x) { 6369 // C++0x [namespace.udecl]p3: 6370 // In a using-declaration used as a member-declaration, the 6371 // nested-name-specifier shall name a base class of the class 6372 // being defined. 6373 6374 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6375 cast<CXXRecordDecl>(NamedContext))) { 6376 if (CurContext == NamedContext) { 6377 Diag(NameLoc, 6378 diag::err_using_decl_nested_name_specifier_is_current_class) 6379 << SS.getRange(); 6380 return true; 6381 } 6382 6383 Diag(SS.getRange().getBegin(), 6384 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6385 << (NestedNameSpecifier*) SS.getScopeRep() 6386 << cast<CXXRecordDecl>(CurContext) 6387 << SS.getRange(); 6388 return true; 6389 } 6390 6391 return false; 6392 } 6393 6394 // C++03 [namespace.udecl]p4: 6395 // A using-declaration used as a member-declaration shall refer 6396 // to a member of a base class of the class being defined [etc.]. 6397 6398 // Salient point: SS doesn't have to name a base class as long as 6399 // lookup only finds members from base classes. Therefore we can 6400 // diagnose here only if we can prove that that can't happen, 6401 // i.e. if the class hierarchies provably don't intersect. 6402 6403 // TODO: it would be nice if "definitely valid" results were cached 6404 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6405 // need to be repeated. 6406 6407 struct UserData { 6408 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 6409 6410 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6411 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6412 Data->Bases.insert(Base); 6413 return true; 6414 } 6415 6416 bool hasDependentBases(const CXXRecordDecl *Class) { 6417 return !Class->forallBases(collect, this); 6418 } 6419 6420 /// Returns true if the base is dependent or is one of the 6421 /// accumulated base classes. 6422 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6423 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6424 return !Data->Bases.count(Base); 6425 } 6426 6427 bool mightShareBases(const CXXRecordDecl *Class) { 6428 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6429 } 6430 }; 6431 6432 UserData Data; 6433 6434 // Returns false if we find a dependent base. 6435 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6436 return false; 6437 6438 // Returns false if the class has a dependent base or if it or one 6439 // of its bases is present in the base set of the current context. 6440 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6441 return false; 6442 6443 Diag(SS.getRange().getBegin(), 6444 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6445 << (NestedNameSpecifier*) SS.getScopeRep() 6446 << cast<CXXRecordDecl>(CurContext) 6447 << SS.getRange(); 6448 6449 return true; 6450} 6451 6452Decl *Sema::ActOnAliasDeclaration(Scope *S, 6453 AccessSpecifier AS, 6454 MultiTemplateParamsArg TemplateParamLists, 6455 SourceLocation UsingLoc, 6456 UnqualifiedId &Name, 6457 TypeResult Type) { 6458 // Skip up to the relevant declaration scope. 6459 while (S->getFlags() & Scope::TemplateParamScope) 6460 S = S->getParent(); 6461 assert((S->getFlags() & Scope::DeclScope) && 6462 "got alias-declaration outside of declaration scope"); 6463 6464 if (Type.isInvalid()) 6465 return 0; 6466 6467 bool Invalid = false; 6468 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6469 TypeSourceInfo *TInfo = 0; 6470 GetTypeFromParser(Type.get(), &TInfo); 6471 6472 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6473 return 0; 6474 6475 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6476 UPPC_DeclarationType)) { 6477 Invalid = true; 6478 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6479 TInfo->getTypeLoc().getBeginLoc()); 6480 } 6481 6482 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6483 LookupName(Previous, S); 6484 6485 // Warn about shadowing the name of a template parameter. 6486 if (Previous.isSingleResult() && 6487 Previous.getFoundDecl()->isTemplateParameter()) { 6488 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6489 Previous.clear(); 6490 } 6491 6492 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6493 "name in alias declaration must be an identifier"); 6494 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6495 Name.StartLocation, 6496 Name.Identifier, TInfo); 6497 6498 NewTD->setAccess(AS); 6499 6500 if (Invalid) 6501 NewTD->setInvalidDecl(); 6502 6503 CheckTypedefForVariablyModifiedType(S, NewTD); 6504 Invalid |= NewTD->isInvalidDecl(); 6505 6506 bool Redeclaration = false; 6507 6508 NamedDecl *NewND; 6509 if (TemplateParamLists.size()) { 6510 TypeAliasTemplateDecl *OldDecl = 0; 6511 TemplateParameterList *OldTemplateParams = 0; 6512 6513 if (TemplateParamLists.size() != 1) { 6514 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6515 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6516 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6517 } 6518 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6519 6520 // Only consider previous declarations in the same scope. 6521 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6522 /*ExplicitInstantiationOrSpecialization*/false); 6523 if (!Previous.empty()) { 6524 Redeclaration = true; 6525 6526 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6527 if (!OldDecl && !Invalid) { 6528 Diag(UsingLoc, diag::err_redefinition_different_kind) 6529 << Name.Identifier; 6530 6531 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6532 if (OldD->getLocation().isValid()) 6533 Diag(OldD->getLocation(), diag::note_previous_definition); 6534 6535 Invalid = true; 6536 } 6537 6538 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6539 if (TemplateParameterListsAreEqual(TemplateParams, 6540 OldDecl->getTemplateParameters(), 6541 /*Complain=*/true, 6542 TPL_TemplateMatch)) 6543 OldTemplateParams = OldDecl->getTemplateParameters(); 6544 else 6545 Invalid = true; 6546 6547 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6548 if (!Invalid && 6549 !Context.hasSameType(OldTD->getUnderlyingType(), 6550 NewTD->getUnderlyingType())) { 6551 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6552 // but we can't reasonably accept it. 6553 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6554 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6555 if (OldTD->getLocation().isValid()) 6556 Diag(OldTD->getLocation(), diag::note_previous_definition); 6557 Invalid = true; 6558 } 6559 } 6560 } 6561 6562 // Merge any previous default template arguments into our parameters, 6563 // and check the parameter list. 6564 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6565 TPC_TypeAliasTemplate)) 6566 return 0; 6567 6568 TypeAliasTemplateDecl *NewDecl = 6569 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6570 Name.Identifier, TemplateParams, 6571 NewTD); 6572 6573 NewDecl->setAccess(AS); 6574 6575 if (Invalid) 6576 NewDecl->setInvalidDecl(); 6577 else if (OldDecl) 6578 NewDecl->setPreviousDeclaration(OldDecl); 6579 6580 NewND = NewDecl; 6581 } else { 6582 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6583 NewND = NewTD; 6584 } 6585 6586 if (!Redeclaration) 6587 PushOnScopeChains(NewND, S); 6588 6589 return NewND; 6590} 6591 6592Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6593 SourceLocation NamespaceLoc, 6594 SourceLocation AliasLoc, 6595 IdentifierInfo *Alias, 6596 CXXScopeSpec &SS, 6597 SourceLocation IdentLoc, 6598 IdentifierInfo *Ident) { 6599 6600 // Lookup the namespace name. 6601 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6602 LookupParsedName(R, S, &SS); 6603 6604 // Check if we have a previous declaration with the same name. 6605 NamedDecl *PrevDecl 6606 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6607 ForRedeclaration); 6608 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6609 PrevDecl = 0; 6610 6611 if (PrevDecl) { 6612 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6613 // We already have an alias with the same name that points to the same 6614 // namespace, so don't create a new one. 6615 // FIXME: At some point, we'll want to create the (redundant) 6616 // declaration to maintain better source information. 6617 if (!R.isAmbiguous() && !R.empty() && 6618 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6619 return 0; 6620 } 6621 6622 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6623 diag::err_redefinition_different_kind; 6624 Diag(AliasLoc, DiagID) << Alias; 6625 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6626 return 0; 6627 } 6628 6629 if (R.isAmbiguous()) 6630 return 0; 6631 6632 if (R.empty()) { 6633 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6634 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6635 return 0; 6636 } 6637 } 6638 6639 NamespaceAliasDecl *AliasDecl = 6640 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6641 Alias, SS.getWithLocInContext(Context), 6642 IdentLoc, R.getFoundDecl()); 6643 6644 PushOnScopeChains(AliasDecl, S); 6645 return AliasDecl; 6646} 6647 6648namespace { 6649 /// \brief Scoped object used to handle the state changes required in Sema 6650 /// to implicitly define the body of a C++ member function; 6651 class ImplicitlyDefinedFunctionScope { 6652 Sema &S; 6653 Sema::ContextRAII SavedContext; 6654 6655 public: 6656 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6657 : S(S), SavedContext(S, Method) 6658 { 6659 S.PushFunctionScope(); 6660 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6661 } 6662 6663 ~ImplicitlyDefinedFunctionScope() { 6664 S.PopExpressionEvaluationContext(); 6665 S.PopFunctionScopeInfo(); 6666 } 6667 }; 6668} 6669 6670Sema::ImplicitExceptionSpecification 6671Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6672 // C++ [except.spec]p14: 6673 // An implicitly declared special member function (Clause 12) shall have an 6674 // exception-specification. [...] 6675 ImplicitExceptionSpecification ExceptSpec(*this); 6676 if (ClassDecl->isInvalidDecl()) 6677 return ExceptSpec; 6678 6679 // Direct base-class constructors. 6680 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6681 BEnd = ClassDecl->bases_end(); 6682 B != BEnd; ++B) { 6683 if (B->isVirtual()) // Handled below. 6684 continue; 6685 6686 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6687 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6688 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6689 // If this is a deleted function, add it anyway. This might be conformant 6690 // with the standard. This might not. I'm not sure. It might not matter. 6691 if (Constructor) 6692 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6693 } 6694 } 6695 6696 // Virtual base-class constructors. 6697 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6698 BEnd = ClassDecl->vbases_end(); 6699 B != BEnd; ++B) { 6700 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6701 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6702 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6703 // If this is a deleted function, add it anyway. This might be conformant 6704 // with the standard. This might not. I'm not sure. It might not matter. 6705 if (Constructor) 6706 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6707 } 6708 } 6709 6710 // Field constructors. 6711 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6712 FEnd = ClassDecl->field_end(); 6713 F != FEnd; ++F) { 6714 if (F->hasInClassInitializer()) { 6715 if (Expr *E = F->getInClassInitializer()) 6716 ExceptSpec.CalledExpr(E); 6717 else if (!F->isInvalidDecl()) 6718 ExceptSpec.SetDelayed(); 6719 } else if (const RecordType *RecordTy 6720 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6721 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6722 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6723 // If this is a deleted function, add it anyway. This might be conformant 6724 // with the standard. This might not. I'm not sure. It might not matter. 6725 // In particular, the problem is that this function never gets called. It 6726 // might just be ill-formed because this function attempts to refer to 6727 // a deleted function here. 6728 if (Constructor) 6729 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 6730 } 6731 } 6732 6733 return ExceptSpec; 6734} 6735 6736CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6737 CXXRecordDecl *ClassDecl) { 6738 // C++ [class.ctor]p5: 6739 // A default constructor for a class X is a constructor of class X 6740 // that can be called without an argument. If there is no 6741 // user-declared constructor for class X, a default constructor is 6742 // implicitly declared. An implicitly-declared default constructor 6743 // is an inline public member of its class. 6744 assert(!ClassDecl->hasUserDeclaredConstructor() && 6745 "Should not build implicit default constructor!"); 6746 6747 ImplicitExceptionSpecification Spec = 6748 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6749 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6750 6751 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 6752 CXXDefaultConstructor, 6753 false); 6754 6755 // Create the actual constructor declaration. 6756 CanQualType ClassType 6757 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6758 SourceLocation ClassLoc = ClassDecl->getLocation(); 6759 DeclarationName Name 6760 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6761 DeclarationNameInfo NameInfo(Name, ClassLoc); 6762 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6763 Context, ClassDecl, ClassLoc, NameInfo, 6764 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0, 6765 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6766 Constexpr); 6767 DefaultCon->setAccess(AS_public); 6768 DefaultCon->setDefaulted(); 6769 DefaultCon->setImplicit(); 6770 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6771 6772 // Note that we have declared this constructor. 6773 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6774 6775 if (Scope *S = getScopeForContext(ClassDecl)) 6776 PushOnScopeChains(DefaultCon, S, false); 6777 ClassDecl->addDecl(DefaultCon); 6778 6779 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6780 DefaultCon->setDeletedAsWritten(); 6781 6782 return DefaultCon; 6783} 6784 6785void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6786 CXXConstructorDecl *Constructor) { 6787 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6788 !Constructor->doesThisDeclarationHaveABody() && 6789 !Constructor->isDeleted()) && 6790 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6791 6792 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6793 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6794 6795 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6796 DiagnosticErrorTrap Trap(Diags); 6797 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6798 Trap.hasErrorOccurred()) { 6799 Diag(CurrentLocation, diag::note_member_synthesized_at) 6800 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6801 Constructor->setInvalidDecl(); 6802 return; 6803 } 6804 6805 SourceLocation Loc = Constructor->getLocation(); 6806 Constructor->setBody(new (Context) CompoundStmt(Loc)); 6807 6808 Constructor->setUsed(); 6809 MarkVTableUsed(CurrentLocation, ClassDecl); 6810 6811 if (ASTMutationListener *L = getASTMutationListener()) { 6812 L->CompletedImplicitDefinition(Constructor); 6813 } 6814} 6815 6816/// Get any existing defaulted default constructor for the given class. Do not 6817/// implicitly define one if it does not exist. 6818static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6819 CXXRecordDecl *D) { 6820 ASTContext &Context = Self.Context; 6821 QualType ClassType = Context.getTypeDeclType(D); 6822 DeclarationName ConstructorName 6823 = Context.DeclarationNames.getCXXConstructorName( 6824 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6825 6826 DeclContext::lookup_const_iterator Con, ConEnd; 6827 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6828 Con != ConEnd; ++Con) { 6829 // A function template cannot be defaulted. 6830 if (isa<FunctionTemplateDecl>(*Con)) 6831 continue; 6832 6833 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6834 if (Constructor->isDefaultConstructor()) 6835 return Constructor->isDefaulted() ? Constructor : 0; 6836 } 6837 return 0; 6838} 6839 6840void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6841 if (!D) return; 6842 AdjustDeclIfTemplate(D); 6843 6844 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6845 CXXConstructorDecl *CtorDecl 6846 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6847 6848 if (!CtorDecl) return; 6849 6850 // Compute the exception specification for the default constructor. 6851 const FunctionProtoType *CtorTy = 6852 CtorDecl->getType()->castAs<FunctionProtoType>(); 6853 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6854 // FIXME: Don't do this unless the exception spec is needed. 6855 ImplicitExceptionSpecification Spec = 6856 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6857 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6858 assert(EPI.ExceptionSpecType != EST_Delayed); 6859 6860 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6861 } 6862 6863 // If the default constructor is explicitly defaulted, checking the exception 6864 // specification is deferred until now. 6865 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6866 !ClassDecl->isDependentType()) 6867 CheckExplicitlyDefaultedSpecialMember(CtorDecl); 6868} 6869 6870void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6871 // We start with an initial pass over the base classes to collect those that 6872 // inherit constructors from. If there are none, we can forgo all further 6873 // processing. 6874 typedef SmallVector<const RecordType *, 4> BasesVector; 6875 BasesVector BasesToInheritFrom; 6876 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6877 BaseE = ClassDecl->bases_end(); 6878 BaseIt != BaseE; ++BaseIt) { 6879 if (BaseIt->getInheritConstructors()) { 6880 QualType Base = BaseIt->getType(); 6881 if (Base->isDependentType()) { 6882 // If we inherit constructors from anything that is dependent, just 6883 // abort processing altogether. We'll get another chance for the 6884 // instantiations. 6885 return; 6886 } 6887 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6888 } 6889 } 6890 if (BasesToInheritFrom.empty()) 6891 return; 6892 6893 // Now collect the constructors that we already have in the current class. 6894 // Those take precedence over inherited constructors. 6895 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6896 // unless there is a user-declared constructor with the same signature in 6897 // the class where the using-declaration appears. 6898 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6899 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6900 CtorE = ClassDecl->ctor_end(); 6901 CtorIt != CtorE; ++CtorIt) { 6902 ExistingConstructors.insert( 6903 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6904 } 6905 6906 DeclarationName CreatedCtorName = 6907 Context.DeclarationNames.getCXXConstructorName( 6908 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6909 6910 // Now comes the true work. 6911 // First, we keep a map from constructor types to the base that introduced 6912 // them. Needed for finding conflicting constructors. We also keep the 6913 // actually inserted declarations in there, for pretty diagnostics. 6914 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6915 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6916 ConstructorToSourceMap InheritedConstructors; 6917 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6918 BaseE = BasesToInheritFrom.end(); 6919 BaseIt != BaseE; ++BaseIt) { 6920 const RecordType *Base = *BaseIt; 6921 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6922 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6923 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6924 CtorE = BaseDecl->ctor_end(); 6925 CtorIt != CtorE; ++CtorIt) { 6926 // Find the using declaration for inheriting this base's constructors. 6927 // FIXME: Don't perform name lookup just to obtain a source location! 6928 DeclarationName Name = 6929 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6930 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 6931 LookupQualifiedName(Result, CurContext); 6932 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 6933 SourceLocation UsingLoc = UD ? UD->getLocation() : 6934 ClassDecl->getLocation(); 6935 6936 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6937 // from the class X named in the using-declaration consists of actual 6938 // constructors and notional constructors that result from the 6939 // transformation of defaulted parameters as follows: 6940 // - all non-template default constructors of X, and 6941 // - for each non-template constructor of X that has at least one 6942 // parameter with a default argument, the set of constructors that 6943 // results from omitting any ellipsis parameter specification and 6944 // successively omitting parameters with a default argument from the 6945 // end of the parameter-type-list. 6946 CXXConstructorDecl *BaseCtor = *CtorIt; 6947 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6948 const FunctionProtoType *BaseCtorType = 6949 BaseCtor->getType()->getAs<FunctionProtoType>(); 6950 6951 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6952 maxParams = BaseCtor->getNumParams(); 6953 params <= maxParams; ++params) { 6954 // Skip default constructors. They're never inherited. 6955 if (params == 0) 6956 continue; 6957 // Skip copy and move constructors for the same reason. 6958 if (CanBeCopyOrMove && params == 1) 6959 continue; 6960 6961 // Build up a function type for this particular constructor. 6962 // FIXME: The working paper does not consider that the exception spec 6963 // for the inheriting constructor might be larger than that of the 6964 // source. This code doesn't yet, either. When it does, this code will 6965 // need to be delayed until after exception specifications and in-class 6966 // member initializers are attached. 6967 const Type *NewCtorType; 6968 if (params == maxParams) 6969 NewCtorType = BaseCtorType; 6970 else { 6971 SmallVector<QualType, 16> Args; 6972 for (unsigned i = 0; i < params; ++i) { 6973 Args.push_back(BaseCtorType->getArgType(i)); 6974 } 6975 FunctionProtoType::ExtProtoInfo ExtInfo = 6976 BaseCtorType->getExtProtoInfo(); 6977 ExtInfo.Variadic = false; 6978 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6979 Args.data(), params, ExtInfo) 6980 .getTypePtr(); 6981 } 6982 const Type *CanonicalNewCtorType = 6983 Context.getCanonicalType(NewCtorType); 6984 6985 // Now that we have the type, first check if the class already has a 6986 // constructor with this signature. 6987 if (ExistingConstructors.count(CanonicalNewCtorType)) 6988 continue; 6989 6990 // Then we check if we have already declared an inherited constructor 6991 // with this signature. 6992 std::pair<ConstructorToSourceMap::iterator, bool> result = 6993 InheritedConstructors.insert(std::make_pair( 6994 CanonicalNewCtorType, 6995 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 6996 if (!result.second) { 6997 // Already in the map. If it came from a different class, that's an 6998 // error. Not if it's from the same. 6999 CanQualType PreviousBase = result.first->second.first; 7000 if (CanonicalBase != PreviousBase) { 7001 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7002 const CXXConstructorDecl *PrevBaseCtor = 7003 PrevCtor->getInheritedConstructor(); 7004 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7005 7006 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7007 Diag(BaseCtor->getLocation(), 7008 diag::note_using_decl_constructor_conflict_current_ctor); 7009 Diag(PrevBaseCtor->getLocation(), 7010 diag::note_using_decl_constructor_conflict_previous_ctor); 7011 Diag(PrevCtor->getLocation(), 7012 diag::note_using_decl_constructor_conflict_previous_using); 7013 } 7014 continue; 7015 } 7016 7017 // OK, we're there, now add the constructor. 7018 // C++0x [class.inhctor]p8: [...] that would be performed by a 7019 // user-written inline constructor [...] 7020 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7021 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7022 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7023 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7024 /*ImplicitlyDeclared=*/true, 7025 // FIXME: Due to a defect in the standard, we treat inherited 7026 // constructors as constexpr even if that makes them ill-formed. 7027 /*Constexpr=*/BaseCtor->isConstexpr()); 7028 NewCtor->setAccess(BaseCtor->getAccess()); 7029 7030 // Build up the parameter decls and add them. 7031 SmallVector<ParmVarDecl *, 16> ParamDecls; 7032 for (unsigned i = 0; i < params; ++i) { 7033 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7034 UsingLoc, UsingLoc, 7035 /*IdentifierInfo=*/0, 7036 BaseCtorType->getArgType(i), 7037 /*TInfo=*/0, SC_None, 7038 SC_None, /*DefaultArg=*/0)); 7039 } 7040 NewCtor->setParams(ParamDecls); 7041 NewCtor->setInheritedConstructor(BaseCtor); 7042 7043 ClassDecl->addDecl(NewCtor); 7044 result.first->second.second = NewCtor; 7045 } 7046 } 7047 } 7048} 7049 7050Sema::ImplicitExceptionSpecification 7051Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7052 // C++ [except.spec]p14: 7053 // An implicitly declared special member function (Clause 12) shall have 7054 // an exception-specification. 7055 ImplicitExceptionSpecification ExceptSpec(*this); 7056 if (ClassDecl->isInvalidDecl()) 7057 return ExceptSpec; 7058 7059 // Direct base-class destructors. 7060 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7061 BEnd = ClassDecl->bases_end(); 7062 B != BEnd; ++B) { 7063 if (B->isVirtual()) // Handled below. 7064 continue; 7065 7066 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7067 ExceptSpec.CalledDecl(B->getLocStart(), 7068 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7069 } 7070 7071 // Virtual base-class destructors. 7072 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7073 BEnd = ClassDecl->vbases_end(); 7074 B != BEnd; ++B) { 7075 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7076 ExceptSpec.CalledDecl(B->getLocStart(), 7077 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7078 } 7079 7080 // Field destructors. 7081 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7082 FEnd = ClassDecl->field_end(); 7083 F != FEnd; ++F) { 7084 if (const RecordType *RecordTy 7085 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7086 ExceptSpec.CalledDecl(F->getLocation(), 7087 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7088 } 7089 7090 return ExceptSpec; 7091} 7092 7093CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7094 // C++ [class.dtor]p2: 7095 // If a class has no user-declared destructor, a destructor is 7096 // declared implicitly. An implicitly-declared destructor is an 7097 // inline public member of its class. 7098 7099 ImplicitExceptionSpecification Spec = 7100 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7101 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7102 7103 // Create the actual destructor declaration. 7104 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7105 7106 CanQualType ClassType 7107 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7108 SourceLocation ClassLoc = ClassDecl->getLocation(); 7109 DeclarationName Name 7110 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7111 DeclarationNameInfo NameInfo(Name, ClassLoc); 7112 CXXDestructorDecl *Destructor 7113 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7114 /*isInline=*/true, 7115 /*isImplicitlyDeclared=*/true); 7116 Destructor->setAccess(AS_public); 7117 Destructor->setDefaulted(); 7118 Destructor->setImplicit(); 7119 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7120 7121 // Note that we have declared this destructor. 7122 ++ASTContext::NumImplicitDestructorsDeclared; 7123 7124 // Introduce this destructor into its scope. 7125 if (Scope *S = getScopeForContext(ClassDecl)) 7126 PushOnScopeChains(Destructor, S, false); 7127 ClassDecl->addDecl(Destructor); 7128 7129 // This could be uniqued if it ever proves significant. 7130 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7131 7132 AddOverriddenMethods(ClassDecl, Destructor); 7133 7134 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7135 Destructor->setDeletedAsWritten(); 7136 7137 return Destructor; 7138} 7139 7140void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7141 CXXDestructorDecl *Destructor) { 7142 assert((Destructor->isDefaulted() && 7143 !Destructor->doesThisDeclarationHaveABody() && 7144 !Destructor->isDeleted()) && 7145 "DefineImplicitDestructor - call it for implicit default dtor"); 7146 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7147 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7148 7149 if (Destructor->isInvalidDecl()) 7150 return; 7151 7152 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7153 7154 DiagnosticErrorTrap Trap(Diags); 7155 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7156 Destructor->getParent()); 7157 7158 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7159 Diag(CurrentLocation, diag::note_member_synthesized_at) 7160 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7161 7162 Destructor->setInvalidDecl(); 7163 return; 7164 } 7165 7166 SourceLocation Loc = Destructor->getLocation(); 7167 Destructor->setBody(new (Context) CompoundStmt(Loc)); 7168 Destructor->setImplicitlyDefined(true); 7169 Destructor->setUsed(); 7170 MarkVTableUsed(CurrentLocation, ClassDecl); 7171 7172 if (ASTMutationListener *L = getASTMutationListener()) { 7173 L->CompletedImplicitDefinition(Destructor); 7174 } 7175} 7176 7177/// \brief Perform any semantic analysis which needs to be delayed until all 7178/// pending class member declarations have been parsed. 7179void Sema::ActOnFinishCXXMemberDecls() { 7180 // Now we have parsed all exception specifications, determine the implicit 7181 // exception specifications for destructors. 7182 for (unsigned i = 0, e = DelayedDestructorExceptionSpecs.size(); 7183 i != e; ++i) { 7184 CXXDestructorDecl *Dtor = DelayedDestructorExceptionSpecs[i]; 7185 AdjustDestructorExceptionSpec(Dtor->getParent(), Dtor, true); 7186 } 7187 DelayedDestructorExceptionSpecs.clear(); 7188 7189 // Perform any deferred checking of exception specifications for virtual 7190 // destructors. 7191 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 7192 i != e; ++i) { 7193 const CXXDestructorDecl *Dtor = 7194 DelayedDestructorExceptionSpecChecks[i].first; 7195 assert(!Dtor->getParent()->isDependentType() && 7196 "Should not ever add destructors of templates into the list."); 7197 CheckOverridingFunctionExceptionSpec(Dtor, 7198 DelayedDestructorExceptionSpecChecks[i].second); 7199 } 7200 DelayedDestructorExceptionSpecChecks.clear(); 7201} 7202 7203void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7204 CXXDestructorDecl *destructor, 7205 bool WasDelayed) { 7206 // C++11 [class.dtor]p3: 7207 // A declaration of a destructor that does not have an exception- 7208 // specification is implicitly considered to have the same exception- 7209 // specification as an implicit declaration. 7210 const FunctionProtoType *dtorType = destructor->getType()-> 7211 getAs<FunctionProtoType>(); 7212 if (!WasDelayed && dtorType->hasExceptionSpec()) 7213 return; 7214 7215 ImplicitExceptionSpecification exceptSpec = 7216 ComputeDefaultedDtorExceptionSpec(classDecl); 7217 7218 // Replace the destructor's type, building off the existing one. Fortunately, 7219 // the only thing of interest in the destructor type is its extended info. 7220 // The return and arguments are fixed. 7221 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7222 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7223 epi.NumExceptions = exceptSpec.size(); 7224 epi.Exceptions = exceptSpec.data(); 7225 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7226 7227 destructor->setType(ty); 7228 7229 // If we can't compute the exception specification for this destructor yet 7230 // (because it depends on an exception specification which we have not parsed 7231 // yet), make a note that we need to try again when the class is complete. 7232 if (epi.ExceptionSpecType == EST_Delayed) { 7233 assert(!WasDelayed && "couldn't compute destructor exception spec"); 7234 DelayedDestructorExceptionSpecs.push_back(destructor); 7235 } 7236 7237 // FIXME: If the destructor has a body that could throw, and the newly created 7238 // spec doesn't allow exceptions, we should emit a warning, because this 7239 // change in behavior can break conforming C++03 programs at runtime. 7240 // However, we don't have a body yet, so it needs to be done somewhere else. 7241} 7242 7243/// \brief Builds a statement that copies/moves the given entity from \p From to 7244/// \c To. 7245/// 7246/// This routine is used to copy/move the members of a class with an 7247/// implicitly-declared copy/move assignment operator. When the entities being 7248/// copied are arrays, this routine builds for loops to copy them. 7249/// 7250/// \param S The Sema object used for type-checking. 7251/// 7252/// \param Loc The location where the implicit copy/move is being generated. 7253/// 7254/// \param T The type of the expressions being copied/moved. Both expressions 7255/// must have this type. 7256/// 7257/// \param To The expression we are copying/moving to. 7258/// 7259/// \param From The expression we are copying/moving from. 7260/// 7261/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7262/// Otherwise, it's a non-static member subobject. 7263/// 7264/// \param Copying Whether we're copying or moving. 7265/// 7266/// \param Depth Internal parameter recording the depth of the recursion. 7267/// 7268/// \returns A statement or a loop that copies the expressions. 7269static StmtResult 7270BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7271 Expr *To, Expr *From, 7272 bool CopyingBaseSubobject, bool Copying, 7273 unsigned Depth = 0) { 7274 // C++0x [class.copy]p28: 7275 // Each subobject is assigned in the manner appropriate to its type: 7276 // 7277 // - if the subobject is of class type, as if by a call to operator= with 7278 // the subobject as the object expression and the corresponding 7279 // subobject of x as a single function argument (as if by explicit 7280 // qualification; that is, ignoring any possible virtual overriding 7281 // functions in more derived classes); 7282 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7283 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7284 7285 // Look for operator=. 7286 DeclarationName Name 7287 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7288 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7289 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7290 7291 // Filter out any result that isn't a copy/move-assignment operator. 7292 LookupResult::Filter F = OpLookup.makeFilter(); 7293 while (F.hasNext()) { 7294 NamedDecl *D = F.next(); 7295 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7296 if (Method->isCopyAssignmentOperator() || 7297 (!Copying && Method->isMoveAssignmentOperator())) 7298 continue; 7299 7300 F.erase(); 7301 } 7302 F.done(); 7303 7304 // Suppress the protected check (C++ [class.protected]) for each of the 7305 // assignment operators we found. This strange dance is required when 7306 // we're assigning via a base classes's copy-assignment operator. To 7307 // ensure that we're getting the right base class subobject (without 7308 // ambiguities), we need to cast "this" to that subobject type; to 7309 // ensure that we don't go through the virtual call mechanism, we need 7310 // to qualify the operator= name with the base class (see below). However, 7311 // this means that if the base class has a protected copy assignment 7312 // operator, the protected member access check will fail. So, we 7313 // rewrite "protected" access to "public" access in this case, since we 7314 // know by construction that we're calling from a derived class. 7315 if (CopyingBaseSubobject) { 7316 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7317 L != LEnd; ++L) { 7318 if (L.getAccess() == AS_protected) 7319 L.setAccess(AS_public); 7320 } 7321 } 7322 7323 // Create the nested-name-specifier that will be used to qualify the 7324 // reference to operator=; this is required to suppress the virtual 7325 // call mechanism. 7326 CXXScopeSpec SS; 7327 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7328 SS.MakeTrivial(S.Context, 7329 NestedNameSpecifier::Create(S.Context, 0, false, 7330 CanonicalT), 7331 Loc); 7332 7333 // Create the reference to operator=. 7334 ExprResult OpEqualRef 7335 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7336 /*TemplateKWLoc=*/SourceLocation(), 7337 /*FirstQualifierInScope=*/0, 7338 OpLookup, 7339 /*TemplateArgs=*/0, 7340 /*SuppressQualifierCheck=*/true); 7341 if (OpEqualRef.isInvalid()) 7342 return StmtError(); 7343 7344 // Build the call to the assignment operator. 7345 7346 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7347 OpEqualRef.takeAs<Expr>(), 7348 Loc, &From, 1, Loc); 7349 if (Call.isInvalid()) 7350 return StmtError(); 7351 7352 return S.Owned(Call.takeAs<Stmt>()); 7353 } 7354 7355 // - if the subobject is of scalar type, the built-in assignment 7356 // operator is used. 7357 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7358 if (!ArrayTy) { 7359 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7360 if (Assignment.isInvalid()) 7361 return StmtError(); 7362 7363 return S.Owned(Assignment.takeAs<Stmt>()); 7364 } 7365 7366 // - if the subobject is an array, each element is assigned, in the 7367 // manner appropriate to the element type; 7368 7369 // Construct a loop over the array bounds, e.g., 7370 // 7371 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7372 // 7373 // that will copy each of the array elements. 7374 QualType SizeType = S.Context.getSizeType(); 7375 7376 // Create the iteration variable. 7377 IdentifierInfo *IterationVarName = 0; 7378 { 7379 SmallString<8> Str; 7380 llvm::raw_svector_ostream OS(Str); 7381 OS << "__i" << Depth; 7382 IterationVarName = &S.Context.Idents.get(OS.str()); 7383 } 7384 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7385 IterationVarName, SizeType, 7386 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7387 SC_None, SC_None); 7388 7389 // Initialize the iteration variable to zero. 7390 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7391 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7392 7393 // Create a reference to the iteration variable; we'll use this several 7394 // times throughout. 7395 Expr *IterationVarRef 7396 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7397 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7398 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7399 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7400 7401 // Create the DeclStmt that holds the iteration variable. 7402 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7403 7404 // Create the comparison against the array bound. 7405 llvm::APInt Upper 7406 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7407 Expr *Comparison 7408 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7409 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7410 BO_NE, S.Context.BoolTy, 7411 VK_RValue, OK_Ordinary, Loc); 7412 7413 // Create the pre-increment of the iteration variable. 7414 Expr *Increment 7415 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7416 VK_LValue, OK_Ordinary, Loc); 7417 7418 // Subscript the "from" and "to" expressions with the iteration variable. 7419 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7420 IterationVarRefRVal, 7421 Loc)); 7422 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7423 IterationVarRefRVal, 7424 Loc)); 7425 if (!Copying) // Cast to rvalue 7426 From = CastForMoving(S, From); 7427 7428 // Build the copy/move for an individual element of the array. 7429 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7430 To, From, CopyingBaseSubobject, 7431 Copying, Depth + 1); 7432 if (Copy.isInvalid()) 7433 return StmtError(); 7434 7435 // Construct the loop that copies all elements of this array. 7436 return S.ActOnForStmt(Loc, Loc, InitStmt, 7437 S.MakeFullExpr(Comparison), 7438 0, S.MakeFullExpr(Increment), 7439 Loc, Copy.take()); 7440} 7441 7442std::pair<Sema::ImplicitExceptionSpecification, bool> 7443Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7444 CXXRecordDecl *ClassDecl) { 7445 if (ClassDecl->isInvalidDecl()) 7446 return std::make_pair(ImplicitExceptionSpecification(*this), true); 7447 7448 // C++ [class.copy]p10: 7449 // If the class definition does not explicitly declare a copy 7450 // assignment operator, one is declared implicitly. 7451 // The implicitly-defined copy assignment operator for a class X 7452 // will have the form 7453 // 7454 // X& X::operator=(const X&) 7455 // 7456 // if 7457 bool HasConstCopyAssignment = true; 7458 7459 // -- each direct base class B of X has a copy assignment operator 7460 // whose parameter is of type const B&, const volatile B& or B, 7461 // and 7462 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7463 BaseEnd = ClassDecl->bases_end(); 7464 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7465 // We'll handle this below 7466 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7467 continue; 7468 7469 assert(!Base->getType()->isDependentType() && 7470 "Cannot generate implicit members for class with dependent bases."); 7471 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7472 HasConstCopyAssignment &= 7473 (bool)LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7474 false, 0); 7475 } 7476 7477 // In C++11, the above citation has "or virtual" added 7478 if (LangOpts.CPlusPlus0x) { 7479 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7480 BaseEnd = ClassDecl->vbases_end(); 7481 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7482 assert(!Base->getType()->isDependentType() && 7483 "Cannot generate implicit members for class with dependent bases."); 7484 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7485 HasConstCopyAssignment &= 7486 (bool)LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7487 false, 0); 7488 } 7489 } 7490 7491 // -- for all the nonstatic data members of X that are of a class 7492 // type M (or array thereof), each such class type has a copy 7493 // assignment operator whose parameter is of type const M&, 7494 // const volatile M& or M. 7495 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7496 FieldEnd = ClassDecl->field_end(); 7497 HasConstCopyAssignment && Field != FieldEnd; 7498 ++Field) { 7499 QualType FieldType = Context.getBaseElementType(Field->getType()); 7500 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7501 HasConstCopyAssignment &= 7502 (bool)LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, 7503 false, 0); 7504 } 7505 } 7506 7507 // Otherwise, the implicitly declared copy assignment operator will 7508 // have the form 7509 // 7510 // X& X::operator=(X&) 7511 7512 // C++ [except.spec]p14: 7513 // An implicitly declared special member function (Clause 12) shall have an 7514 // exception-specification. [...] 7515 7516 // It is unspecified whether or not an implicit copy assignment operator 7517 // attempts to deduplicate calls to assignment operators of virtual bases are 7518 // made. As such, this exception specification is effectively unspecified. 7519 // Based on a similar decision made for constness in C++0x, we're erring on 7520 // the side of assuming such calls to be made regardless of whether they 7521 // actually happen. 7522 ImplicitExceptionSpecification ExceptSpec(*this); 7523 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7524 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7525 BaseEnd = ClassDecl->bases_end(); 7526 Base != BaseEnd; ++Base) { 7527 if (Base->isVirtual()) 7528 continue; 7529 7530 CXXRecordDecl *BaseClassDecl 7531 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7532 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7533 ArgQuals, false, 0)) 7534 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7535 } 7536 7537 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7538 BaseEnd = ClassDecl->vbases_end(); 7539 Base != BaseEnd; ++Base) { 7540 CXXRecordDecl *BaseClassDecl 7541 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7542 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7543 ArgQuals, false, 0)) 7544 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7545 } 7546 7547 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7548 FieldEnd = ClassDecl->field_end(); 7549 Field != FieldEnd; 7550 ++Field) { 7551 QualType FieldType = Context.getBaseElementType(Field->getType()); 7552 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7553 if (CXXMethodDecl *CopyAssign = 7554 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7555 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 7556 } 7557 } 7558 7559 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7560} 7561 7562CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7563 // Note: The following rules are largely analoguous to the copy 7564 // constructor rules. Note that virtual bases are not taken into account 7565 // for determining the argument type of the operator. Note also that 7566 // operators taking an object instead of a reference are allowed. 7567 7568 ImplicitExceptionSpecification Spec(*this); 7569 bool Const; 7570 llvm::tie(Spec, Const) = 7571 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7572 7573 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7574 QualType RetType = Context.getLValueReferenceType(ArgType); 7575 if (Const) 7576 ArgType = ArgType.withConst(); 7577 ArgType = Context.getLValueReferenceType(ArgType); 7578 7579 // An implicitly-declared copy assignment operator is an inline public 7580 // member of its class. 7581 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7582 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7583 SourceLocation ClassLoc = ClassDecl->getLocation(); 7584 DeclarationNameInfo NameInfo(Name, ClassLoc); 7585 CXXMethodDecl *CopyAssignment 7586 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7587 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7588 /*TInfo=*/0, /*isStatic=*/false, 7589 /*StorageClassAsWritten=*/SC_None, 7590 /*isInline=*/true, /*isConstexpr=*/false, 7591 SourceLocation()); 7592 CopyAssignment->setAccess(AS_public); 7593 CopyAssignment->setDefaulted(); 7594 CopyAssignment->setImplicit(); 7595 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7596 7597 // Add the parameter to the operator. 7598 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7599 ClassLoc, ClassLoc, /*Id=*/0, 7600 ArgType, /*TInfo=*/0, 7601 SC_None, 7602 SC_None, 0); 7603 CopyAssignment->setParams(FromParam); 7604 7605 // Note that we have added this copy-assignment operator. 7606 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7607 7608 if (Scope *S = getScopeForContext(ClassDecl)) 7609 PushOnScopeChains(CopyAssignment, S, false); 7610 ClassDecl->addDecl(CopyAssignment); 7611 7612 // C++0x [class.copy]p19: 7613 // .... If the class definition does not explicitly declare a copy 7614 // assignment operator, there is no user-declared move constructor, and 7615 // there is no user-declared move assignment operator, a copy assignment 7616 // operator is implicitly declared as defaulted. 7617 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7618 CopyAssignment->setDeletedAsWritten(); 7619 7620 AddOverriddenMethods(ClassDecl, CopyAssignment); 7621 return CopyAssignment; 7622} 7623 7624void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7625 CXXMethodDecl *CopyAssignOperator) { 7626 assert((CopyAssignOperator->isDefaulted() && 7627 CopyAssignOperator->isOverloadedOperator() && 7628 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7629 !CopyAssignOperator->doesThisDeclarationHaveABody() && 7630 !CopyAssignOperator->isDeleted()) && 7631 "DefineImplicitCopyAssignment called for wrong function"); 7632 7633 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7634 7635 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7636 CopyAssignOperator->setInvalidDecl(); 7637 return; 7638 } 7639 7640 CopyAssignOperator->setUsed(); 7641 7642 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7643 DiagnosticErrorTrap Trap(Diags); 7644 7645 // C++0x [class.copy]p30: 7646 // The implicitly-defined or explicitly-defaulted copy assignment operator 7647 // for a non-union class X performs memberwise copy assignment of its 7648 // subobjects. The direct base classes of X are assigned first, in the 7649 // order of their declaration in the base-specifier-list, and then the 7650 // immediate non-static data members of X are assigned, in the order in 7651 // which they were declared in the class definition. 7652 7653 // The statements that form the synthesized function body. 7654 ASTOwningVector<Stmt*> Statements(*this); 7655 7656 // The parameter for the "other" object, which we are copying from. 7657 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7658 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7659 QualType OtherRefType = Other->getType(); 7660 if (const LValueReferenceType *OtherRef 7661 = OtherRefType->getAs<LValueReferenceType>()) { 7662 OtherRefType = OtherRef->getPointeeType(); 7663 OtherQuals = OtherRefType.getQualifiers(); 7664 } 7665 7666 // Our location for everything implicitly-generated. 7667 SourceLocation Loc = CopyAssignOperator->getLocation(); 7668 7669 // Construct a reference to the "other" object. We'll be using this 7670 // throughout the generated ASTs. 7671 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7672 assert(OtherRef && "Reference to parameter cannot fail!"); 7673 7674 // Construct the "this" pointer. We'll be using this throughout the generated 7675 // ASTs. 7676 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7677 assert(This && "Reference to this cannot fail!"); 7678 7679 // Assign base classes. 7680 bool Invalid = false; 7681 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7682 E = ClassDecl->bases_end(); Base != E; ++Base) { 7683 // Form the assignment: 7684 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7685 QualType BaseType = Base->getType().getUnqualifiedType(); 7686 if (!BaseType->isRecordType()) { 7687 Invalid = true; 7688 continue; 7689 } 7690 7691 CXXCastPath BasePath; 7692 BasePath.push_back(Base); 7693 7694 // Construct the "from" expression, which is an implicit cast to the 7695 // appropriately-qualified base type. 7696 Expr *From = OtherRef; 7697 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7698 CK_UncheckedDerivedToBase, 7699 VK_LValue, &BasePath).take(); 7700 7701 // Dereference "this". 7702 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7703 7704 // Implicitly cast "this" to the appropriately-qualified base type. 7705 To = ImpCastExprToType(To.take(), 7706 Context.getCVRQualifiedType(BaseType, 7707 CopyAssignOperator->getTypeQualifiers()), 7708 CK_UncheckedDerivedToBase, 7709 VK_LValue, &BasePath); 7710 7711 // Build the copy. 7712 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7713 To.get(), From, 7714 /*CopyingBaseSubobject=*/true, 7715 /*Copying=*/true); 7716 if (Copy.isInvalid()) { 7717 Diag(CurrentLocation, diag::note_member_synthesized_at) 7718 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7719 CopyAssignOperator->setInvalidDecl(); 7720 return; 7721 } 7722 7723 // Success! Record the copy. 7724 Statements.push_back(Copy.takeAs<Expr>()); 7725 } 7726 7727 // \brief Reference to the __builtin_memcpy function. 7728 Expr *BuiltinMemCpyRef = 0; 7729 // \brief Reference to the __builtin_objc_memmove_collectable function. 7730 Expr *CollectableMemCpyRef = 0; 7731 7732 // Assign non-static members. 7733 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7734 FieldEnd = ClassDecl->field_end(); 7735 Field != FieldEnd; ++Field) { 7736 if (Field->isUnnamedBitfield()) 7737 continue; 7738 7739 // Check for members of reference type; we can't copy those. 7740 if (Field->getType()->isReferenceType()) { 7741 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7742 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7743 Diag(Field->getLocation(), diag::note_declared_at); 7744 Diag(CurrentLocation, diag::note_member_synthesized_at) 7745 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7746 Invalid = true; 7747 continue; 7748 } 7749 7750 // Check for members of const-qualified, non-class type. 7751 QualType BaseType = Context.getBaseElementType(Field->getType()); 7752 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7753 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7754 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7755 Diag(Field->getLocation(), diag::note_declared_at); 7756 Diag(CurrentLocation, diag::note_member_synthesized_at) 7757 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7758 Invalid = true; 7759 continue; 7760 } 7761 7762 // Suppress assigning zero-width bitfields. 7763 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7764 continue; 7765 7766 QualType FieldType = Field->getType().getNonReferenceType(); 7767 if (FieldType->isIncompleteArrayType()) { 7768 assert(ClassDecl->hasFlexibleArrayMember() && 7769 "Incomplete array type is not valid"); 7770 continue; 7771 } 7772 7773 // Build references to the field in the object we're copying from and to. 7774 CXXScopeSpec SS; // Intentionally empty 7775 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7776 LookupMemberName); 7777 MemberLookup.addDecl(*Field); 7778 MemberLookup.resolveKind(); 7779 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7780 Loc, /*IsArrow=*/false, 7781 SS, SourceLocation(), 0, 7782 MemberLookup, 0); 7783 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7784 Loc, /*IsArrow=*/true, 7785 SS, SourceLocation(), 0, 7786 MemberLookup, 0); 7787 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7788 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7789 7790 // If the field should be copied with __builtin_memcpy rather than via 7791 // explicit assignments, do so. This optimization only applies for arrays 7792 // of scalars and arrays of class type with trivial copy-assignment 7793 // operators. 7794 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7795 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7796 // Compute the size of the memory buffer to be copied. 7797 QualType SizeType = Context.getSizeType(); 7798 llvm::APInt Size(Context.getTypeSize(SizeType), 7799 Context.getTypeSizeInChars(BaseType).getQuantity()); 7800 for (const ConstantArrayType *Array 7801 = Context.getAsConstantArrayType(FieldType); 7802 Array; 7803 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7804 llvm::APInt ArraySize 7805 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7806 Size *= ArraySize; 7807 } 7808 7809 // Take the address of the field references for "from" and "to". 7810 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7811 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7812 7813 bool NeedsCollectableMemCpy = 7814 (BaseType->isRecordType() && 7815 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7816 7817 if (NeedsCollectableMemCpy) { 7818 if (!CollectableMemCpyRef) { 7819 // Create a reference to the __builtin_objc_memmove_collectable function. 7820 LookupResult R(*this, 7821 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7822 Loc, LookupOrdinaryName); 7823 LookupName(R, TUScope, true); 7824 7825 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7826 if (!CollectableMemCpy) { 7827 // Something went horribly wrong earlier, and we will have 7828 // complained about it. 7829 Invalid = true; 7830 continue; 7831 } 7832 7833 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7834 CollectableMemCpy->getType(), 7835 VK_LValue, Loc, 0).take(); 7836 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7837 } 7838 } 7839 // Create a reference to the __builtin_memcpy builtin function. 7840 else if (!BuiltinMemCpyRef) { 7841 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7842 LookupOrdinaryName); 7843 LookupName(R, TUScope, true); 7844 7845 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7846 if (!BuiltinMemCpy) { 7847 // Something went horribly wrong earlier, and we will have complained 7848 // about it. 7849 Invalid = true; 7850 continue; 7851 } 7852 7853 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7854 BuiltinMemCpy->getType(), 7855 VK_LValue, Loc, 0).take(); 7856 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7857 } 7858 7859 ASTOwningVector<Expr*> CallArgs(*this); 7860 CallArgs.push_back(To.takeAs<Expr>()); 7861 CallArgs.push_back(From.takeAs<Expr>()); 7862 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7863 ExprResult Call = ExprError(); 7864 if (NeedsCollectableMemCpy) 7865 Call = ActOnCallExpr(/*Scope=*/0, 7866 CollectableMemCpyRef, 7867 Loc, move_arg(CallArgs), 7868 Loc); 7869 else 7870 Call = ActOnCallExpr(/*Scope=*/0, 7871 BuiltinMemCpyRef, 7872 Loc, move_arg(CallArgs), 7873 Loc); 7874 7875 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7876 Statements.push_back(Call.takeAs<Expr>()); 7877 continue; 7878 } 7879 7880 // Build the copy of this field. 7881 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7882 To.get(), From.get(), 7883 /*CopyingBaseSubobject=*/false, 7884 /*Copying=*/true); 7885 if (Copy.isInvalid()) { 7886 Diag(CurrentLocation, diag::note_member_synthesized_at) 7887 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7888 CopyAssignOperator->setInvalidDecl(); 7889 return; 7890 } 7891 7892 // Success! Record the copy. 7893 Statements.push_back(Copy.takeAs<Stmt>()); 7894 } 7895 7896 if (!Invalid) { 7897 // Add a "return *this;" 7898 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7899 7900 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7901 if (Return.isInvalid()) 7902 Invalid = true; 7903 else { 7904 Statements.push_back(Return.takeAs<Stmt>()); 7905 7906 if (Trap.hasErrorOccurred()) { 7907 Diag(CurrentLocation, diag::note_member_synthesized_at) 7908 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7909 Invalid = true; 7910 } 7911 } 7912 } 7913 7914 if (Invalid) { 7915 CopyAssignOperator->setInvalidDecl(); 7916 return; 7917 } 7918 7919 StmtResult Body; 7920 { 7921 CompoundScopeRAII CompoundScope(*this); 7922 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7923 /*isStmtExpr=*/false); 7924 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7925 } 7926 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7927 7928 if (ASTMutationListener *L = getASTMutationListener()) { 7929 L->CompletedImplicitDefinition(CopyAssignOperator); 7930 } 7931} 7932 7933Sema::ImplicitExceptionSpecification 7934Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7935 ImplicitExceptionSpecification ExceptSpec(*this); 7936 7937 if (ClassDecl->isInvalidDecl()) 7938 return ExceptSpec; 7939 7940 // C++0x [except.spec]p14: 7941 // An implicitly declared special member function (Clause 12) shall have an 7942 // exception-specification. [...] 7943 7944 // It is unspecified whether or not an implicit move assignment operator 7945 // attempts to deduplicate calls to assignment operators of virtual bases are 7946 // made. As such, this exception specification is effectively unspecified. 7947 // Based on a similar decision made for constness in C++0x, we're erring on 7948 // the side of assuming such calls to be made regardless of whether they 7949 // actually happen. 7950 // Note that a move constructor is not implicitly declared when there are 7951 // virtual bases, but it can still be user-declared and explicitly defaulted. 7952 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7953 BaseEnd = ClassDecl->bases_end(); 7954 Base != BaseEnd; ++Base) { 7955 if (Base->isVirtual()) 7956 continue; 7957 7958 CXXRecordDecl *BaseClassDecl 7959 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7960 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7961 false, 0)) 7962 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 7963 } 7964 7965 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7966 BaseEnd = ClassDecl->vbases_end(); 7967 Base != BaseEnd; ++Base) { 7968 CXXRecordDecl *BaseClassDecl 7969 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7970 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7971 false, 0)) 7972 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 7973 } 7974 7975 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7976 FieldEnd = ClassDecl->field_end(); 7977 Field != FieldEnd; 7978 ++Field) { 7979 QualType FieldType = Context.getBaseElementType(Field->getType()); 7980 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7981 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 7982 false, 0)) 7983 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 7984 } 7985 } 7986 7987 return ExceptSpec; 7988} 7989 7990/// Determine whether the class type has any direct or indirect virtual base 7991/// classes which have a non-trivial move assignment operator. 7992static bool 7993hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 7994 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7995 BaseEnd = ClassDecl->vbases_end(); 7996 Base != BaseEnd; ++Base) { 7997 CXXRecordDecl *BaseClass = 7998 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7999 8000 // Try to declare the move assignment. If it would be deleted, then the 8001 // class does not have a non-trivial move assignment. 8002 if (BaseClass->needsImplicitMoveAssignment()) 8003 S.DeclareImplicitMoveAssignment(BaseClass); 8004 8005 // If the class has both a trivial move assignment and a non-trivial move 8006 // assignment, hasTrivialMoveAssignment() is false. 8007 if (BaseClass->hasDeclaredMoveAssignment() && 8008 !BaseClass->hasTrivialMoveAssignment()) 8009 return true; 8010 } 8011 8012 return false; 8013} 8014 8015/// Determine whether the given type either has a move constructor or is 8016/// trivially copyable. 8017static bool 8018hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8019 Type = S.Context.getBaseElementType(Type); 8020 8021 // FIXME: Technically, non-trivially-copyable non-class types, such as 8022 // reference types, are supposed to return false here, but that appears 8023 // to be a standard defect. 8024 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8025 if (!ClassDecl || !ClassDecl->getDefinition()) 8026 return true; 8027 8028 if (Type.isTriviallyCopyableType(S.Context)) 8029 return true; 8030 8031 if (IsConstructor) { 8032 if (ClassDecl->needsImplicitMoveConstructor()) 8033 S.DeclareImplicitMoveConstructor(ClassDecl); 8034 return ClassDecl->hasDeclaredMoveConstructor(); 8035 } 8036 8037 if (ClassDecl->needsImplicitMoveAssignment()) 8038 S.DeclareImplicitMoveAssignment(ClassDecl); 8039 return ClassDecl->hasDeclaredMoveAssignment(); 8040} 8041 8042/// Determine whether all non-static data members and direct or virtual bases 8043/// of class \p ClassDecl have either a move operation, or are trivially 8044/// copyable. 8045static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8046 bool IsConstructor) { 8047 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8048 BaseEnd = ClassDecl->bases_end(); 8049 Base != BaseEnd; ++Base) { 8050 if (Base->isVirtual()) 8051 continue; 8052 8053 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8054 return false; 8055 } 8056 8057 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8058 BaseEnd = ClassDecl->vbases_end(); 8059 Base != BaseEnd; ++Base) { 8060 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8061 return false; 8062 } 8063 8064 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8065 FieldEnd = ClassDecl->field_end(); 8066 Field != FieldEnd; ++Field) { 8067 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 8068 return false; 8069 } 8070 8071 return true; 8072} 8073 8074CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8075 // C++11 [class.copy]p20: 8076 // If the definition of a class X does not explicitly declare a move 8077 // assignment operator, one will be implicitly declared as defaulted 8078 // if and only if: 8079 // 8080 // - [first 4 bullets] 8081 assert(ClassDecl->needsImplicitMoveAssignment()); 8082 8083 // [Checked after we build the declaration] 8084 // - the move assignment operator would not be implicitly defined as 8085 // deleted, 8086 8087 // [DR1402]: 8088 // - X has no direct or indirect virtual base class with a non-trivial 8089 // move assignment operator, and 8090 // - each of X's non-static data members and direct or virtual base classes 8091 // has a type that either has a move assignment operator or is trivially 8092 // copyable. 8093 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8094 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8095 ClassDecl->setFailedImplicitMoveAssignment(); 8096 return 0; 8097 } 8098 8099 // Note: The following rules are largely analoguous to the move 8100 // constructor rules. 8101 8102 ImplicitExceptionSpecification Spec( 8103 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8104 8105 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8106 QualType RetType = Context.getLValueReferenceType(ArgType); 8107 ArgType = Context.getRValueReferenceType(ArgType); 8108 8109 // An implicitly-declared move assignment operator is an inline public 8110 // member of its class. 8111 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8112 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8113 SourceLocation ClassLoc = ClassDecl->getLocation(); 8114 DeclarationNameInfo NameInfo(Name, ClassLoc); 8115 CXXMethodDecl *MoveAssignment 8116 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8117 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8118 /*TInfo=*/0, /*isStatic=*/false, 8119 /*StorageClassAsWritten=*/SC_None, 8120 /*isInline=*/true, 8121 /*isConstexpr=*/false, 8122 SourceLocation()); 8123 MoveAssignment->setAccess(AS_public); 8124 MoveAssignment->setDefaulted(); 8125 MoveAssignment->setImplicit(); 8126 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8127 8128 // Add the parameter to the operator. 8129 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8130 ClassLoc, ClassLoc, /*Id=*/0, 8131 ArgType, /*TInfo=*/0, 8132 SC_None, 8133 SC_None, 0); 8134 MoveAssignment->setParams(FromParam); 8135 8136 // Note that we have added this copy-assignment operator. 8137 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8138 8139 // C++0x [class.copy]p9: 8140 // If the definition of a class X does not explicitly declare a move 8141 // assignment operator, one will be implicitly declared as defaulted if and 8142 // only if: 8143 // [...] 8144 // - the move assignment operator would not be implicitly defined as 8145 // deleted. 8146 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8147 // Cache this result so that we don't try to generate this over and over 8148 // on every lookup, leaking memory and wasting time. 8149 ClassDecl->setFailedImplicitMoveAssignment(); 8150 return 0; 8151 } 8152 8153 if (Scope *S = getScopeForContext(ClassDecl)) 8154 PushOnScopeChains(MoveAssignment, S, false); 8155 ClassDecl->addDecl(MoveAssignment); 8156 8157 AddOverriddenMethods(ClassDecl, MoveAssignment); 8158 return MoveAssignment; 8159} 8160 8161void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8162 CXXMethodDecl *MoveAssignOperator) { 8163 assert((MoveAssignOperator->isDefaulted() && 8164 MoveAssignOperator->isOverloadedOperator() && 8165 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8166 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8167 !MoveAssignOperator->isDeleted()) && 8168 "DefineImplicitMoveAssignment called for wrong function"); 8169 8170 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8171 8172 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8173 MoveAssignOperator->setInvalidDecl(); 8174 return; 8175 } 8176 8177 MoveAssignOperator->setUsed(); 8178 8179 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8180 DiagnosticErrorTrap Trap(Diags); 8181 8182 // C++0x [class.copy]p28: 8183 // The implicitly-defined or move assignment operator for a non-union class 8184 // X performs memberwise move assignment of its subobjects. The direct base 8185 // classes of X are assigned first, in the order of their declaration in the 8186 // base-specifier-list, and then the immediate non-static data members of X 8187 // are assigned, in the order in which they were declared in the class 8188 // definition. 8189 8190 // The statements that form the synthesized function body. 8191 ASTOwningVector<Stmt*> Statements(*this); 8192 8193 // The parameter for the "other" object, which we are move from. 8194 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8195 QualType OtherRefType = Other->getType()-> 8196 getAs<RValueReferenceType>()->getPointeeType(); 8197 assert(OtherRefType.getQualifiers() == 0 && 8198 "Bad argument type of defaulted move assignment"); 8199 8200 // Our location for everything implicitly-generated. 8201 SourceLocation Loc = MoveAssignOperator->getLocation(); 8202 8203 // Construct a reference to the "other" object. We'll be using this 8204 // throughout the generated ASTs. 8205 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8206 assert(OtherRef && "Reference to parameter cannot fail!"); 8207 // Cast to rvalue. 8208 OtherRef = CastForMoving(*this, OtherRef); 8209 8210 // Construct the "this" pointer. We'll be using this throughout the generated 8211 // ASTs. 8212 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8213 assert(This && "Reference to this cannot fail!"); 8214 8215 // Assign base classes. 8216 bool Invalid = false; 8217 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8218 E = ClassDecl->bases_end(); Base != E; ++Base) { 8219 // Form the assignment: 8220 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8221 QualType BaseType = Base->getType().getUnqualifiedType(); 8222 if (!BaseType->isRecordType()) { 8223 Invalid = true; 8224 continue; 8225 } 8226 8227 CXXCastPath BasePath; 8228 BasePath.push_back(Base); 8229 8230 // Construct the "from" expression, which is an implicit cast to the 8231 // appropriately-qualified base type. 8232 Expr *From = OtherRef; 8233 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8234 VK_XValue, &BasePath).take(); 8235 8236 // Dereference "this". 8237 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8238 8239 // Implicitly cast "this" to the appropriately-qualified base type. 8240 To = ImpCastExprToType(To.take(), 8241 Context.getCVRQualifiedType(BaseType, 8242 MoveAssignOperator->getTypeQualifiers()), 8243 CK_UncheckedDerivedToBase, 8244 VK_LValue, &BasePath); 8245 8246 // Build the move. 8247 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8248 To.get(), From, 8249 /*CopyingBaseSubobject=*/true, 8250 /*Copying=*/false); 8251 if (Move.isInvalid()) { 8252 Diag(CurrentLocation, diag::note_member_synthesized_at) 8253 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8254 MoveAssignOperator->setInvalidDecl(); 8255 return; 8256 } 8257 8258 // Success! Record the move. 8259 Statements.push_back(Move.takeAs<Expr>()); 8260 } 8261 8262 // \brief Reference to the __builtin_memcpy function. 8263 Expr *BuiltinMemCpyRef = 0; 8264 // \brief Reference to the __builtin_objc_memmove_collectable function. 8265 Expr *CollectableMemCpyRef = 0; 8266 8267 // Assign non-static members. 8268 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8269 FieldEnd = ClassDecl->field_end(); 8270 Field != FieldEnd; ++Field) { 8271 if (Field->isUnnamedBitfield()) 8272 continue; 8273 8274 // Check for members of reference type; we can't move those. 8275 if (Field->getType()->isReferenceType()) { 8276 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8277 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8278 Diag(Field->getLocation(), diag::note_declared_at); 8279 Diag(CurrentLocation, diag::note_member_synthesized_at) 8280 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8281 Invalid = true; 8282 continue; 8283 } 8284 8285 // Check for members of const-qualified, non-class type. 8286 QualType BaseType = Context.getBaseElementType(Field->getType()); 8287 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8288 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8289 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8290 Diag(Field->getLocation(), diag::note_declared_at); 8291 Diag(CurrentLocation, diag::note_member_synthesized_at) 8292 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8293 Invalid = true; 8294 continue; 8295 } 8296 8297 // Suppress assigning zero-width bitfields. 8298 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8299 continue; 8300 8301 QualType FieldType = Field->getType().getNonReferenceType(); 8302 if (FieldType->isIncompleteArrayType()) { 8303 assert(ClassDecl->hasFlexibleArrayMember() && 8304 "Incomplete array type is not valid"); 8305 continue; 8306 } 8307 8308 // Build references to the field in the object we're copying from and to. 8309 CXXScopeSpec SS; // Intentionally empty 8310 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8311 LookupMemberName); 8312 MemberLookup.addDecl(*Field); 8313 MemberLookup.resolveKind(); 8314 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8315 Loc, /*IsArrow=*/false, 8316 SS, SourceLocation(), 0, 8317 MemberLookup, 0); 8318 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8319 Loc, /*IsArrow=*/true, 8320 SS, SourceLocation(), 0, 8321 MemberLookup, 0); 8322 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8323 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8324 8325 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8326 "Member reference with rvalue base must be rvalue except for reference " 8327 "members, which aren't allowed for move assignment."); 8328 8329 // If the field should be copied with __builtin_memcpy rather than via 8330 // explicit assignments, do so. This optimization only applies for arrays 8331 // of scalars and arrays of class type with trivial move-assignment 8332 // operators. 8333 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8334 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8335 // Compute the size of the memory buffer to be copied. 8336 QualType SizeType = Context.getSizeType(); 8337 llvm::APInt Size(Context.getTypeSize(SizeType), 8338 Context.getTypeSizeInChars(BaseType).getQuantity()); 8339 for (const ConstantArrayType *Array 8340 = Context.getAsConstantArrayType(FieldType); 8341 Array; 8342 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8343 llvm::APInt ArraySize 8344 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8345 Size *= ArraySize; 8346 } 8347 8348 // Take the address of the field references for "from" and "to". We 8349 // directly construct UnaryOperators here because semantic analysis 8350 // does not permit us to take the address of an xvalue. 8351 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8352 Context.getPointerType(From.get()->getType()), 8353 VK_RValue, OK_Ordinary, Loc); 8354 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8355 Context.getPointerType(To.get()->getType()), 8356 VK_RValue, OK_Ordinary, Loc); 8357 8358 bool NeedsCollectableMemCpy = 8359 (BaseType->isRecordType() && 8360 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8361 8362 if (NeedsCollectableMemCpy) { 8363 if (!CollectableMemCpyRef) { 8364 // Create a reference to the __builtin_objc_memmove_collectable function. 8365 LookupResult R(*this, 8366 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8367 Loc, LookupOrdinaryName); 8368 LookupName(R, TUScope, true); 8369 8370 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8371 if (!CollectableMemCpy) { 8372 // Something went horribly wrong earlier, and we will have 8373 // complained about it. 8374 Invalid = true; 8375 continue; 8376 } 8377 8378 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8379 CollectableMemCpy->getType(), 8380 VK_LValue, Loc, 0).take(); 8381 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8382 } 8383 } 8384 // Create a reference to the __builtin_memcpy builtin function. 8385 else if (!BuiltinMemCpyRef) { 8386 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8387 LookupOrdinaryName); 8388 LookupName(R, TUScope, true); 8389 8390 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8391 if (!BuiltinMemCpy) { 8392 // Something went horribly wrong earlier, and we will have complained 8393 // about it. 8394 Invalid = true; 8395 continue; 8396 } 8397 8398 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8399 BuiltinMemCpy->getType(), 8400 VK_LValue, Loc, 0).take(); 8401 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8402 } 8403 8404 ASTOwningVector<Expr*> CallArgs(*this); 8405 CallArgs.push_back(To.takeAs<Expr>()); 8406 CallArgs.push_back(From.takeAs<Expr>()); 8407 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8408 ExprResult Call = ExprError(); 8409 if (NeedsCollectableMemCpy) 8410 Call = ActOnCallExpr(/*Scope=*/0, 8411 CollectableMemCpyRef, 8412 Loc, move_arg(CallArgs), 8413 Loc); 8414 else 8415 Call = ActOnCallExpr(/*Scope=*/0, 8416 BuiltinMemCpyRef, 8417 Loc, move_arg(CallArgs), 8418 Loc); 8419 8420 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8421 Statements.push_back(Call.takeAs<Expr>()); 8422 continue; 8423 } 8424 8425 // Build the move of this field. 8426 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8427 To.get(), From.get(), 8428 /*CopyingBaseSubobject=*/false, 8429 /*Copying=*/false); 8430 if (Move.isInvalid()) { 8431 Diag(CurrentLocation, diag::note_member_synthesized_at) 8432 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8433 MoveAssignOperator->setInvalidDecl(); 8434 return; 8435 } 8436 8437 // Success! Record the copy. 8438 Statements.push_back(Move.takeAs<Stmt>()); 8439 } 8440 8441 if (!Invalid) { 8442 // Add a "return *this;" 8443 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8444 8445 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8446 if (Return.isInvalid()) 8447 Invalid = true; 8448 else { 8449 Statements.push_back(Return.takeAs<Stmt>()); 8450 8451 if (Trap.hasErrorOccurred()) { 8452 Diag(CurrentLocation, diag::note_member_synthesized_at) 8453 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8454 Invalid = true; 8455 } 8456 } 8457 } 8458 8459 if (Invalid) { 8460 MoveAssignOperator->setInvalidDecl(); 8461 return; 8462 } 8463 8464 StmtResult Body; 8465 { 8466 CompoundScopeRAII CompoundScope(*this); 8467 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8468 /*isStmtExpr=*/false); 8469 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8470 } 8471 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8472 8473 if (ASTMutationListener *L = getASTMutationListener()) { 8474 L->CompletedImplicitDefinition(MoveAssignOperator); 8475 } 8476} 8477 8478std::pair<Sema::ImplicitExceptionSpecification, bool> 8479Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8480 if (ClassDecl->isInvalidDecl()) 8481 return std::make_pair(ImplicitExceptionSpecification(*this), true); 8482 8483 // C++ [class.copy]p5: 8484 // The implicitly-declared copy constructor for a class X will 8485 // have the form 8486 // 8487 // X::X(const X&) 8488 // 8489 // if 8490 // FIXME: It ought to be possible to store this on the record. 8491 bool HasConstCopyConstructor = true; 8492 8493 // -- each direct or virtual base class B of X has a copy 8494 // constructor whose first parameter is of type const B& or 8495 // const volatile B&, and 8496 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8497 BaseEnd = ClassDecl->bases_end(); 8498 HasConstCopyConstructor && Base != BaseEnd; 8499 ++Base) { 8500 // Virtual bases are handled below. 8501 if (Base->isVirtual()) 8502 continue; 8503 8504 CXXRecordDecl *BaseClassDecl 8505 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8506 HasConstCopyConstructor &= 8507 (bool)LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const); 8508 } 8509 8510 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8511 BaseEnd = ClassDecl->vbases_end(); 8512 HasConstCopyConstructor && Base != BaseEnd; 8513 ++Base) { 8514 CXXRecordDecl *BaseClassDecl 8515 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8516 HasConstCopyConstructor &= 8517 (bool)LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const); 8518 } 8519 8520 // -- for all the nonstatic data members of X that are of a 8521 // class type M (or array thereof), each such class type 8522 // has a copy constructor whose first parameter is of type 8523 // const M& or const volatile M&. 8524 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8525 FieldEnd = ClassDecl->field_end(); 8526 HasConstCopyConstructor && Field != FieldEnd; 8527 ++Field) { 8528 QualType FieldType = Context.getBaseElementType(Field->getType()); 8529 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8530 HasConstCopyConstructor &= 8531 (bool)LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const); 8532 } 8533 } 8534 // Otherwise, the implicitly declared copy constructor will have 8535 // the form 8536 // 8537 // X::X(X&) 8538 8539 // C++ [except.spec]p14: 8540 // An implicitly declared special member function (Clause 12) shall have an 8541 // exception-specification. [...] 8542 ImplicitExceptionSpecification ExceptSpec(*this); 8543 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8544 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8545 BaseEnd = ClassDecl->bases_end(); 8546 Base != BaseEnd; 8547 ++Base) { 8548 // Virtual bases are handled below. 8549 if (Base->isVirtual()) 8550 continue; 8551 8552 CXXRecordDecl *BaseClassDecl 8553 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8554 if (CXXConstructorDecl *CopyConstructor = 8555 LookupCopyingConstructor(BaseClassDecl, Quals)) 8556 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8557 } 8558 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8559 BaseEnd = ClassDecl->vbases_end(); 8560 Base != BaseEnd; 8561 ++Base) { 8562 CXXRecordDecl *BaseClassDecl 8563 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8564 if (CXXConstructorDecl *CopyConstructor = 8565 LookupCopyingConstructor(BaseClassDecl, Quals)) 8566 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8567 } 8568 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8569 FieldEnd = ClassDecl->field_end(); 8570 Field != FieldEnd; 8571 ++Field) { 8572 QualType FieldType = Context.getBaseElementType(Field->getType()); 8573 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8574 if (CXXConstructorDecl *CopyConstructor = 8575 LookupCopyingConstructor(FieldClassDecl, Quals)) 8576 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 8577 } 8578 } 8579 8580 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8581} 8582 8583CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8584 CXXRecordDecl *ClassDecl) { 8585 // C++ [class.copy]p4: 8586 // If the class definition does not explicitly declare a copy 8587 // constructor, one is declared implicitly. 8588 8589 ImplicitExceptionSpecification Spec(*this); 8590 bool Const; 8591 llvm::tie(Spec, Const) = 8592 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8593 8594 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8595 QualType ArgType = ClassType; 8596 if (Const) 8597 ArgType = ArgType.withConst(); 8598 ArgType = Context.getLValueReferenceType(ArgType); 8599 8600 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8601 8602 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8603 CXXCopyConstructor, 8604 Const); 8605 8606 DeclarationName Name 8607 = Context.DeclarationNames.getCXXConstructorName( 8608 Context.getCanonicalType(ClassType)); 8609 SourceLocation ClassLoc = ClassDecl->getLocation(); 8610 DeclarationNameInfo NameInfo(Name, ClassLoc); 8611 8612 // An implicitly-declared copy constructor is an inline public 8613 // member of its class. 8614 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8615 Context, ClassDecl, ClassLoc, NameInfo, 8616 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8617 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8618 Constexpr); 8619 CopyConstructor->setAccess(AS_public); 8620 CopyConstructor->setDefaulted(); 8621 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8622 8623 // Note that we have declared this constructor. 8624 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8625 8626 // Add the parameter to the constructor. 8627 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8628 ClassLoc, ClassLoc, 8629 /*IdentifierInfo=*/0, 8630 ArgType, /*TInfo=*/0, 8631 SC_None, 8632 SC_None, 0); 8633 CopyConstructor->setParams(FromParam); 8634 8635 if (Scope *S = getScopeForContext(ClassDecl)) 8636 PushOnScopeChains(CopyConstructor, S, false); 8637 ClassDecl->addDecl(CopyConstructor); 8638 8639 // C++11 [class.copy]p8: 8640 // ... If the class definition does not explicitly declare a copy 8641 // constructor, there is no user-declared move constructor, and there is no 8642 // user-declared move assignment operator, a copy constructor is implicitly 8643 // declared as defaulted. 8644 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8645 CopyConstructor->setDeletedAsWritten(); 8646 8647 return CopyConstructor; 8648} 8649 8650void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8651 CXXConstructorDecl *CopyConstructor) { 8652 assert((CopyConstructor->isDefaulted() && 8653 CopyConstructor->isCopyConstructor() && 8654 !CopyConstructor->doesThisDeclarationHaveABody() && 8655 !CopyConstructor->isDeleted()) && 8656 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8657 8658 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8659 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8660 8661 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8662 DiagnosticErrorTrap Trap(Diags); 8663 8664 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8665 Trap.hasErrorOccurred()) { 8666 Diag(CurrentLocation, diag::note_member_synthesized_at) 8667 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8668 CopyConstructor->setInvalidDecl(); 8669 } else { 8670 Sema::CompoundScopeRAII CompoundScope(*this); 8671 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8672 CopyConstructor->getLocation(), 8673 MultiStmtArg(*this, 0, 0), 8674 /*isStmtExpr=*/false) 8675 .takeAs<Stmt>()); 8676 CopyConstructor->setImplicitlyDefined(true); 8677 } 8678 8679 CopyConstructor->setUsed(); 8680 if (ASTMutationListener *L = getASTMutationListener()) { 8681 L->CompletedImplicitDefinition(CopyConstructor); 8682 } 8683} 8684 8685Sema::ImplicitExceptionSpecification 8686Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8687 // C++ [except.spec]p14: 8688 // An implicitly declared special member function (Clause 12) shall have an 8689 // exception-specification. [...] 8690 ImplicitExceptionSpecification ExceptSpec(*this); 8691 if (ClassDecl->isInvalidDecl()) 8692 return ExceptSpec; 8693 8694 // Direct base-class constructors. 8695 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8696 BEnd = ClassDecl->bases_end(); 8697 B != BEnd; ++B) { 8698 if (B->isVirtual()) // Handled below. 8699 continue; 8700 8701 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8702 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8703 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8704 // If this is a deleted function, add it anyway. This might be conformant 8705 // with the standard. This might not. I'm not sure. It might not matter. 8706 if (Constructor) 8707 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8708 } 8709 } 8710 8711 // Virtual base-class constructors. 8712 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8713 BEnd = ClassDecl->vbases_end(); 8714 B != BEnd; ++B) { 8715 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8716 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8717 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8718 // If this is a deleted function, add it anyway. This might be conformant 8719 // with the standard. This might not. I'm not sure. It might not matter. 8720 if (Constructor) 8721 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8722 } 8723 } 8724 8725 // Field constructors. 8726 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8727 FEnd = ClassDecl->field_end(); 8728 F != FEnd; ++F) { 8729 if (const RecordType *RecordTy 8730 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8731 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8732 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8733 // If this is a deleted function, add it anyway. This might be conformant 8734 // with the standard. This might not. I'm not sure. It might not matter. 8735 // In particular, the problem is that this function never gets called. It 8736 // might just be ill-formed because this function attempts to refer to 8737 // a deleted function here. 8738 if (Constructor) 8739 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 8740 } 8741 } 8742 8743 return ExceptSpec; 8744} 8745 8746CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8747 CXXRecordDecl *ClassDecl) { 8748 // C++11 [class.copy]p9: 8749 // If the definition of a class X does not explicitly declare a move 8750 // constructor, one will be implicitly declared as defaulted if and only if: 8751 // 8752 // - [first 4 bullets] 8753 assert(ClassDecl->needsImplicitMoveConstructor()); 8754 8755 // [Checked after we build the declaration] 8756 // - the move assignment operator would not be implicitly defined as 8757 // deleted, 8758 8759 // [DR1402]: 8760 // - each of X's non-static data members and direct or virtual base classes 8761 // has a type that either has a move constructor or is trivially copyable. 8762 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 8763 ClassDecl->setFailedImplicitMoveConstructor(); 8764 return 0; 8765 } 8766 8767 ImplicitExceptionSpecification Spec( 8768 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8769 8770 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8771 QualType ArgType = Context.getRValueReferenceType(ClassType); 8772 8773 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8774 8775 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8776 CXXMoveConstructor, 8777 false); 8778 8779 DeclarationName Name 8780 = Context.DeclarationNames.getCXXConstructorName( 8781 Context.getCanonicalType(ClassType)); 8782 SourceLocation ClassLoc = ClassDecl->getLocation(); 8783 DeclarationNameInfo NameInfo(Name, ClassLoc); 8784 8785 // C++0x [class.copy]p11: 8786 // An implicitly-declared copy/move constructor is an inline public 8787 // member of its class. 8788 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8789 Context, ClassDecl, ClassLoc, NameInfo, 8790 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8791 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8792 Constexpr); 8793 MoveConstructor->setAccess(AS_public); 8794 MoveConstructor->setDefaulted(); 8795 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8796 8797 // Add the parameter to the constructor. 8798 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8799 ClassLoc, ClassLoc, 8800 /*IdentifierInfo=*/0, 8801 ArgType, /*TInfo=*/0, 8802 SC_None, 8803 SC_None, 0); 8804 MoveConstructor->setParams(FromParam); 8805 8806 // C++0x [class.copy]p9: 8807 // If the definition of a class X does not explicitly declare a move 8808 // constructor, one will be implicitly declared as defaulted if and only if: 8809 // [...] 8810 // - the move constructor would not be implicitly defined as deleted. 8811 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8812 // Cache this result so that we don't try to generate this over and over 8813 // on every lookup, leaking memory and wasting time. 8814 ClassDecl->setFailedImplicitMoveConstructor(); 8815 return 0; 8816 } 8817 8818 // Note that we have declared this constructor. 8819 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8820 8821 if (Scope *S = getScopeForContext(ClassDecl)) 8822 PushOnScopeChains(MoveConstructor, S, false); 8823 ClassDecl->addDecl(MoveConstructor); 8824 8825 return MoveConstructor; 8826} 8827 8828void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8829 CXXConstructorDecl *MoveConstructor) { 8830 assert((MoveConstructor->isDefaulted() && 8831 MoveConstructor->isMoveConstructor() && 8832 !MoveConstructor->doesThisDeclarationHaveABody() && 8833 !MoveConstructor->isDeleted()) && 8834 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8835 8836 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8837 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8838 8839 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8840 DiagnosticErrorTrap Trap(Diags); 8841 8842 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8843 Trap.hasErrorOccurred()) { 8844 Diag(CurrentLocation, diag::note_member_synthesized_at) 8845 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8846 MoveConstructor->setInvalidDecl(); 8847 } else { 8848 Sema::CompoundScopeRAII CompoundScope(*this); 8849 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8850 MoveConstructor->getLocation(), 8851 MultiStmtArg(*this, 0, 0), 8852 /*isStmtExpr=*/false) 8853 .takeAs<Stmt>()); 8854 MoveConstructor->setImplicitlyDefined(true); 8855 } 8856 8857 MoveConstructor->setUsed(); 8858 8859 if (ASTMutationListener *L = getASTMutationListener()) { 8860 L->CompletedImplicitDefinition(MoveConstructor); 8861 } 8862} 8863 8864bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 8865 return FD->isDeleted() && 8866 (FD->isDefaulted() || FD->isImplicit()) && 8867 isa<CXXMethodDecl>(FD); 8868} 8869 8870/// \brief Mark the call operator of the given lambda closure type as "used". 8871static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 8872 CXXMethodDecl *CallOperator 8873 = cast<CXXMethodDecl>( 8874 *Lambda->lookup( 8875 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8876 CallOperator->setReferenced(); 8877 CallOperator->setUsed(); 8878} 8879 8880void Sema::DefineImplicitLambdaToFunctionPointerConversion( 8881 SourceLocation CurrentLocation, 8882 CXXConversionDecl *Conv) 8883{ 8884 CXXRecordDecl *Lambda = Conv->getParent(); 8885 8886 // Make sure that the lambda call operator is marked used. 8887 markLambdaCallOperatorUsed(*this, Lambda); 8888 8889 Conv->setUsed(); 8890 8891 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8892 DiagnosticErrorTrap Trap(Diags); 8893 8894 // Return the address of the __invoke function. 8895 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 8896 CXXMethodDecl *Invoke 8897 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 8898 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 8899 VK_LValue, Conv->getLocation()).take(); 8900 assert(FunctionRef && "Can't refer to __invoke function?"); 8901 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 8902 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 8903 Conv->getLocation(), 8904 Conv->getLocation())); 8905 8906 // Fill in the __invoke function with a dummy implementation. IR generation 8907 // will fill in the actual details. 8908 Invoke->setUsed(); 8909 Invoke->setReferenced(); 8910 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation())); 8911 8912 if (ASTMutationListener *L = getASTMutationListener()) { 8913 L->CompletedImplicitDefinition(Conv); 8914 L->CompletedImplicitDefinition(Invoke); 8915 } 8916} 8917 8918void Sema::DefineImplicitLambdaToBlockPointerConversion( 8919 SourceLocation CurrentLocation, 8920 CXXConversionDecl *Conv) 8921{ 8922 Conv->setUsed(); 8923 8924 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8925 DiagnosticErrorTrap Trap(Diags); 8926 8927 // Copy-initialize the lambda object as needed to capture it. 8928 Expr *This = ActOnCXXThis(CurrentLocation).take(); 8929 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 8930 8931 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 8932 Conv->getLocation(), 8933 Conv, DerefThis); 8934 8935 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 8936 // behavior. Note that only the general conversion function does this 8937 // (since it's unusable otherwise); in the case where we inline the 8938 // block literal, it has block literal lifetime semantics. 8939 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 8940 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 8941 CK_CopyAndAutoreleaseBlockObject, 8942 BuildBlock.get(), 0, VK_RValue); 8943 8944 if (BuildBlock.isInvalid()) { 8945 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8946 Conv->setInvalidDecl(); 8947 return; 8948 } 8949 8950 // Create the return statement that returns the block from the conversion 8951 // function. 8952 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 8953 if (Return.isInvalid()) { 8954 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8955 Conv->setInvalidDecl(); 8956 return; 8957 } 8958 8959 // Set the body of the conversion function. 8960 Stmt *ReturnS = Return.take(); 8961 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 8962 Conv->getLocation(), 8963 Conv->getLocation())); 8964 8965 // We're done; notify the mutation listener, if any. 8966 if (ASTMutationListener *L = getASTMutationListener()) { 8967 L->CompletedImplicitDefinition(Conv); 8968 } 8969} 8970 8971/// \brief Determine whether the given list arguments contains exactly one 8972/// "real" (non-default) argument. 8973static bool hasOneRealArgument(MultiExprArg Args) { 8974 switch (Args.size()) { 8975 case 0: 8976 return false; 8977 8978 default: 8979 if (!Args.get()[1]->isDefaultArgument()) 8980 return false; 8981 8982 // fall through 8983 case 1: 8984 return !Args.get()[0]->isDefaultArgument(); 8985 } 8986 8987 return false; 8988} 8989 8990ExprResult 8991Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8992 CXXConstructorDecl *Constructor, 8993 MultiExprArg ExprArgs, 8994 bool HadMultipleCandidates, 8995 bool RequiresZeroInit, 8996 unsigned ConstructKind, 8997 SourceRange ParenRange) { 8998 bool Elidable = false; 8999 9000 // C++0x [class.copy]p34: 9001 // When certain criteria are met, an implementation is allowed to 9002 // omit the copy/move construction of a class object, even if the 9003 // copy/move constructor and/or destructor for the object have 9004 // side effects. [...] 9005 // - when a temporary class object that has not been bound to a 9006 // reference (12.2) would be copied/moved to a class object 9007 // with the same cv-unqualified type, the copy/move operation 9008 // can be omitted by constructing the temporary object 9009 // directly into the target of the omitted copy/move 9010 if (ConstructKind == CXXConstructExpr::CK_Complete && 9011 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9012 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 9013 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9014 } 9015 9016 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9017 Elidable, move(ExprArgs), HadMultipleCandidates, 9018 RequiresZeroInit, ConstructKind, ParenRange); 9019} 9020 9021/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9022/// including handling of its default argument expressions. 9023ExprResult 9024Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9025 CXXConstructorDecl *Constructor, bool Elidable, 9026 MultiExprArg ExprArgs, 9027 bool HadMultipleCandidates, 9028 bool RequiresZeroInit, 9029 unsigned ConstructKind, 9030 SourceRange ParenRange) { 9031 unsigned NumExprs = ExprArgs.size(); 9032 Expr **Exprs = (Expr **)ExprArgs.release(); 9033 9034 MarkFunctionReferenced(ConstructLoc, Constructor); 9035 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9036 Constructor, Elidable, Exprs, NumExprs, 9037 HadMultipleCandidates, /*FIXME*/false, 9038 RequiresZeroInit, 9039 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9040 ParenRange)); 9041} 9042 9043bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9044 CXXConstructorDecl *Constructor, 9045 MultiExprArg Exprs, 9046 bool HadMultipleCandidates) { 9047 // FIXME: Provide the correct paren SourceRange when available. 9048 ExprResult TempResult = 9049 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9050 move(Exprs), HadMultipleCandidates, false, 9051 CXXConstructExpr::CK_Complete, SourceRange()); 9052 if (TempResult.isInvalid()) 9053 return true; 9054 9055 Expr *Temp = TempResult.takeAs<Expr>(); 9056 CheckImplicitConversions(Temp, VD->getLocation()); 9057 MarkFunctionReferenced(VD->getLocation(), Constructor); 9058 Temp = MaybeCreateExprWithCleanups(Temp); 9059 VD->setInit(Temp); 9060 9061 return false; 9062} 9063 9064void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9065 if (VD->isInvalidDecl()) return; 9066 9067 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9068 if (ClassDecl->isInvalidDecl()) return; 9069 if (ClassDecl->hasIrrelevantDestructor()) return; 9070 if (ClassDecl->isDependentContext()) return; 9071 9072 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9073 MarkFunctionReferenced(VD->getLocation(), Destructor); 9074 CheckDestructorAccess(VD->getLocation(), Destructor, 9075 PDiag(diag::err_access_dtor_var) 9076 << VD->getDeclName() 9077 << VD->getType()); 9078 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9079 9080 if (!VD->hasGlobalStorage()) return; 9081 9082 // Emit warning for non-trivial dtor in global scope (a real global, 9083 // class-static, function-static). 9084 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9085 9086 // TODO: this should be re-enabled for static locals by !CXAAtExit 9087 if (!VD->isStaticLocal()) 9088 Diag(VD->getLocation(), diag::warn_global_destructor); 9089} 9090 9091/// \brief Given a constructor and the set of arguments provided for the 9092/// constructor, convert the arguments and add any required default arguments 9093/// to form a proper call to this constructor. 9094/// 9095/// \returns true if an error occurred, false otherwise. 9096bool 9097Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9098 MultiExprArg ArgsPtr, 9099 SourceLocation Loc, 9100 ASTOwningVector<Expr*> &ConvertedArgs, 9101 bool AllowExplicit) { 9102 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9103 unsigned NumArgs = ArgsPtr.size(); 9104 Expr **Args = (Expr **)ArgsPtr.get(); 9105 9106 const FunctionProtoType *Proto 9107 = Constructor->getType()->getAs<FunctionProtoType>(); 9108 assert(Proto && "Constructor without a prototype?"); 9109 unsigned NumArgsInProto = Proto->getNumArgs(); 9110 9111 // If too few arguments are available, we'll fill in the rest with defaults. 9112 if (NumArgs < NumArgsInProto) 9113 ConvertedArgs.reserve(NumArgsInProto); 9114 else 9115 ConvertedArgs.reserve(NumArgs); 9116 9117 VariadicCallType CallType = 9118 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9119 SmallVector<Expr *, 8> AllArgs; 9120 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9121 Proto, 0, Args, NumArgs, AllArgs, 9122 CallType, AllowExplicit); 9123 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9124 9125 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9126 9127 CheckConstructorCall(Constructor, AllArgs.data(), AllArgs.size(), 9128 Proto, Loc); 9129 9130 return Invalid; 9131} 9132 9133static inline bool 9134CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9135 const FunctionDecl *FnDecl) { 9136 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9137 if (isa<NamespaceDecl>(DC)) { 9138 return SemaRef.Diag(FnDecl->getLocation(), 9139 diag::err_operator_new_delete_declared_in_namespace) 9140 << FnDecl->getDeclName(); 9141 } 9142 9143 if (isa<TranslationUnitDecl>(DC) && 9144 FnDecl->getStorageClass() == SC_Static) { 9145 return SemaRef.Diag(FnDecl->getLocation(), 9146 diag::err_operator_new_delete_declared_static) 9147 << FnDecl->getDeclName(); 9148 } 9149 9150 return false; 9151} 9152 9153static inline bool 9154CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9155 CanQualType ExpectedResultType, 9156 CanQualType ExpectedFirstParamType, 9157 unsigned DependentParamTypeDiag, 9158 unsigned InvalidParamTypeDiag) { 9159 QualType ResultType = 9160 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9161 9162 // Check that the result type is not dependent. 9163 if (ResultType->isDependentType()) 9164 return SemaRef.Diag(FnDecl->getLocation(), 9165 diag::err_operator_new_delete_dependent_result_type) 9166 << FnDecl->getDeclName() << ExpectedResultType; 9167 9168 // Check that the result type is what we expect. 9169 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9170 return SemaRef.Diag(FnDecl->getLocation(), 9171 diag::err_operator_new_delete_invalid_result_type) 9172 << FnDecl->getDeclName() << ExpectedResultType; 9173 9174 // A function template must have at least 2 parameters. 9175 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9176 return SemaRef.Diag(FnDecl->getLocation(), 9177 diag::err_operator_new_delete_template_too_few_parameters) 9178 << FnDecl->getDeclName(); 9179 9180 // The function decl must have at least 1 parameter. 9181 if (FnDecl->getNumParams() == 0) 9182 return SemaRef.Diag(FnDecl->getLocation(), 9183 diag::err_operator_new_delete_too_few_parameters) 9184 << FnDecl->getDeclName(); 9185 9186 // Check the the first parameter type is not dependent. 9187 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9188 if (FirstParamType->isDependentType()) 9189 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9190 << FnDecl->getDeclName() << ExpectedFirstParamType; 9191 9192 // Check that the first parameter type is what we expect. 9193 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9194 ExpectedFirstParamType) 9195 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9196 << FnDecl->getDeclName() << ExpectedFirstParamType; 9197 9198 return false; 9199} 9200 9201static bool 9202CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9203 // C++ [basic.stc.dynamic.allocation]p1: 9204 // A program is ill-formed if an allocation function is declared in a 9205 // namespace scope other than global scope or declared static in global 9206 // scope. 9207 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9208 return true; 9209 9210 CanQualType SizeTy = 9211 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9212 9213 // C++ [basic.stc.dynamic.allocation]p1: 9214 // The return type shall be void*. The first parameter shall have type 9215 // std::size_t. 9216 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9217 SizeTy, 9218 diag::err_operator_new_dependent_param_type, 9219 diag::err_operator_new_param_type)) 9220 return true; 9221 9222 // C++ [basic.stc.dynamic.allocation]p1: 9223 // The first parameter shall not have an associated default argument. 9224 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9225 return SemaRef.Diag(FnDecl->getLocation(), 9226 diag::err_operator_new_default_arg) 9227 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9228 9229 return false; 9230} 9231 9232static bool 9233CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9234 // C++ [basic.stc.dynamic.deallocation]p1: 9235 // A program is ill-formed if deallocation functions are declared in a 9236 // namespace scope other than global scope or declared static in global 9237 // scope. 9238 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9239 return true; 9240 9241 // C++ [basic.stc.dynamic.deallocation]p2: 9242 // Each deallocation function shall return void and its first parameter 9243 // shall be void*. 9244 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9245 SemaRef.Context.VoidPtrTy, 9246 diag::err_operator_delete_dependent_param_type, 9247 diag::err_operator_delete_param_type)) 9248 return true; 9249 9250 return false; 9251} 9252 9253/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9254/// of this overloaded operator is well-formed. If so, returns false; 9255/// otherwise, emits appropriate diagnostics and returns true. 9256bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9257 assert(FnDecl && FnDecl->isOverloadedOperator() && 9258 "Expected an overloaded operator declaration"); 9259 9260 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9261 9262 // C++ [over.oper]p5: 9263 // The allocation and deallocation functions, operator new, 9264 // operator new[], operator delete and operator delete[], are 9265 // described completely in 3.7.3. The attributes and restrictions 9266 // found in the rest of this subclause do not apply to them unless 9267 // explicitly stated in 3.7.3. 9268 if (Op == OO_Delete || Op == OO_Array_Delete) 9269 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9270 9271 if (Op == OO_New || Op == OO_Array_New) 9272 return CheckOperatorNewDeclaration(*this, FnDecl); 9273 9274 // C++ [over.oper]p6: 9275 // An operator function shall either be a non-static member 9276 // function or be a non-member function and have at least one 9277 // parameter whose type is a class, a reference to a class, an 9278 // enumeration, or a reference to an enumeration. 9279 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9280 if (MethodDecl->isStatic()) 9281 return Diag(FnDecl->getLocation(), 9282 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9283 } else { 9284 bool ClassOrEnumParam = false; 9285 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9286 ParamEnd = FnDecl->param_end(); 9287 Param != ParamEnd; ++Param) { 9288 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9289 if (ParamType->isDependentType() || ParamType->isRecordType() || 9290 ParamType->isEnumeralType()) { 9291 ClassOrEnumParam = true; 9292 break; 9293 } 9294 } 9295 9296 if (!ClassOrEnumParam) 9297 return Diag(FnDecl->getLocation(), 9298 diag::err_operator_overload_needs_class_or_enum) 9299 << FnDecl->getDeclName(); 9300 } 9301 9302 // C++ [over.oper]p8: 9303 // An operator function cannot have default arguments (8.3.6), 9304 // except where explicitly stated below. 9305 // 9306 // Only the function-call operator allows default arguments 9307 // (C++ [over.call]p1). 9308 if (Op != OO_Call) { 9309 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9310 Param != FnDecl->param_end(); ++Param) { 9311 if ((*Param)->hasDefaultArg()) 9312 return Diag((*Param)->getLocation(), 9313 diag::err_operator_overload_default_arg) 9314 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9315 } 9316 } 9317 9318 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9319 { false, false, false } 9320#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9321 , { Unary, Binary, MemberOnly } 9322#include "clang/Basic/OperatorKinds.def" 9323 }; 9324 9325 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9326 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9327 bool MustBeMemberOperator = OperatorUses[Op][2]; 9328 9329 // C++ [over.oper]p8: 9330 // [...] Operator functions cannot have more or fewer parameters 9331 // than the number required for the corresponding operator, as 9332 // described in the rest of this subclause. 9333 unsigned NumParams = FnDecl->getNumParams() 9334 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9335 if (Op != OO_Call && 9336 ((NumParams == 1 && !CanBeUnaryOperator) || 9337 (NumParams == 2 && !CanBeBinaryOperator) || 9338 (NumParams < 1) || (NumParams > 2))) { 9339 // We have the wrong number of parameters. 9340 unsigned ErrorKind; 9341 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9342 ErrorKind = 2; // 2 -> unary or binary. 9343 } else if (CanBeUnaryOperator) { 9344 ErrorKind = 0; // 0 -> unary 9345 } else { 9346 assert(CanBeBinaryOperator && 9347 "All non-call overloaded operators are unary or binary!"); 9348 ErrorKind = 1; // 1 -> binary 9349 } 9350 9351 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9352 << FnDecl->getDeclName() << NumParams << ErrorKind; 9353 } 9354 9355 // Overloaded operators other than operator() cannot be variadic. 9356 if (Op != OO_Call && 9357 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9358 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9359 << FnDecl->getDeclName(); 9360 } 9361 9362 // Some operators must be non-static member functions. 9363 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9364 return Diag(FnDecl->getLocation(), 9365 diag::err_operator_overload_must_be_member) 9366 << FnDecl->getDeclName(); 9367 } 9368 9369 // C++ [over.inc]p1: 9370 // The user-defined function called operator++ implements the 9371 // prefix and postfix ++ operator. If this function is a member 9372 // function with no parameters, or a non-member function with one 9373 // parameter of class or enumeration type, it defines the prefix 9374 // increment operator ++ for objects of that type. If the function 9375 // is a member function with one parameter (which shall be of type 9376 // int) or a non-member function with two parameters (the second 9377 // of which shall be of type int), it defines the postfix 9378 // increment operator ++ for objects of that type. 9379 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9380 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9381 bool ParamIsInt = false; 9382 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9383 ParamIsInt = BT->getKind() == BuiltinType::Int; 9384 9385 if (!ParamIsInt) 9386 return Diag(LastParam->getLocation(), 9387 diag::err_operator_overload_post_incdec_must_be_int) 9388 << LastParam->getType() << (Op == OO_MinusMinus); 9389 } 9390 9391 return false; 9392} 9393 9394/// CheckLiteralOperatorDeclaration - Check whether the declaration 9395/// of this literal operator function is well-formed. If so, returns 9396/// false; otherwise, emits appropriate diagnostics and returns true. 9397bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9398 if (isa<CXXMethodDecl>(FnDecl)) { 9399 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9400 << FnDecl->getDeclName(); 9401 return true; 9402 } 9403 9404 if (FnDecl->isExternC()) { 9405 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 9406 return true; 9407 } 9408 9409 bool Valid = false; 9410 9411 // This might be the definition of a literal operator template. 9412 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 9413 // This might be a specialization of a literal operator template. 9414 if (!TpDecl) 9415 TpDecl = FnDecl->getPrimaryTemplate(); 9416 9417 // template <char...> type operator "" name() is the only valid template 9418 // signature, and the only valid signature with no parameters. 9419 if (TpDecl) { 9420 if (FnDecl->param_size() == 0) { 9421 // Must have only one template parameter 9422 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9423 if (Params->size() == 1) { 9424 NonTypeTemplateParmDecl *PmDecl = 9425 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9426 9427 // The template parameter must be a char parameter pack. 9428 if (PmDecl && PmDecl->isTemplateParameterPack() && 9429 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9430 Valid = true; 9431 } 9432 } 9433 } else if (FnDecl->param_size()) { 9434 // Check the first parameter 9435 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9436 9437 QualType T = (*Param)->getType().getUnqualifiedType(); 9438 9439 // unsigned long long int, long double, and any character type are allowed 9440 // as the only parameters. 9441 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9442 Context.hasSameType(T, Context.LongDoubleTy) || 9443 Context.hasSameType(T, Context.CharTy) || 9444 Context.hasSameType(T, Context.WCharTy) || 9445 Context.hasSameType(T, Context.Char16Ty) || 9446 Context.hasSameType(T, Context.Char32Ty)) { 9447 if (++Param == FnDecl->param_end()) 9448 Valid = true; 9449 goto FinishedParams; 9450 } 9451 9452 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9453 const PointerType *PT = T->getAs<PointerType>(); 9454 if (!PT) 9455 goto FinishedParams; 9456 T = PT->getPointeeType(); 9457 if (!T.isConstQualified() || T.isVolatileQualified()) 9458 goto FinishedParams; 9459 T = T.getUnqualifiedType(); 9460 9461 // Move on to the second parameter; 9462 ++Param; 9463 9464 // If there is no second parameter, the first must be a const char * 9465 if (Param == FnDecl->param_end()) { 9466 if (Context.hasSameType(T, Context.CharTy)) 9467 Valid = true; 9468 goto FinishedParams; 9469 } 9470 9471 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9472 // are allowed as the first parameter to a two-parameter function 9473 if (!(Context.hasSameType(T, Context.CharTy) || 9474 Context.hasSameType(T, Context.WCharTy) || 9475 Context.hasSameType(T, Context.Char16Ty) || 9476 Context.hasSameType(T, Context.Char32Ty))) 9477 goto FinishedParams; 9478 9479 // The second and final parameter must be an std::size_t 9480 T = (*Param)->getType().getUnqualifiedType(); 9481 if (Context.hasSameType(T, Context.getSizeType()) && 9482 ++Param == FnDecl->param_end()) 9483 Valid = true; 9484 } 9485 9486 // FIXME: This diagnostic is absolutely terrible. 9487FinishedParams: 9488 if (!Valid) { 9489 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9490 << FnDecl->getDeclName(); 9491 return true; 9492 } 9493 9494 // A parameter-declaration-clause containing a default argument is not 9495 // equivalent to any of the permitted forms. 9496 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9497 ParamEnd = FnDecl->param_end(); 9498 Param != ParamEnd; ++Param) { 9499 if ((*Param)->hasDefaultArg()) { 9500 Diag((*Param)->getDefaultArgRange().getBegin(), 9501 diag::err_literal_operator_default_argument) 9502 << (*Param)->getDefaultArgRange(); 9503 break; 9504 } 9505 } 9506 9507 StringRef LiteralName 9508 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9509 if (LiteralName[0] != '_') { 9510 // C++11 [usrlit.suffix]p1: 9511 // Literal suffix identifiers that do not start with an underscore 9512 // are reserved for future standardization. 9513 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9514 } 9515 9516 return false; 9517} 9518 9519/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9520/// linkage specification, including the language and (if present) 9521/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9522/// the location of the language string literal, which is provided 9523/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9524/// the '{' brace. Otherwise, this linkage specification does not 9525/// have any braces. 9526Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9527 SourceLocation LangLoc, 9528 StringRef Lang, 9529 SourceLocation LBraceLoc) { 9530 LinkageSpecDecl::LanguageIDs Language; 9531 if (Lang == "\"C\"") 9532 Language = LinkageSpecDecl::lang_c; 9533 else if (Lang == "\"C++\"") 9534 Language = LinkageSpecDecl::lang_cxx; 9535 else { 9536 Diag(LangLoc, diag::err_bad_language); 9537 return 0; 9538 } 9539 9540 // FIXME: Add all the various semantics of linkage specifications 9541 9542 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9543 ExternLoc, LangLoc, Language); 9544 CurContext->addDecl(D); 9545 PushDeclContext(S, D); 9546 return D; 9547} 9548 9549/// ActOnFinishLinkageSpecification - Complete the definition of 9550/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9551/// valid, it's the position of the closing '}' brace in a linkage 9552/// specification that uses braces. 9553Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9554 Decl *LinkageSpec, 9555 SourceLocation RBraceLoc) { 9556 if (LinkageSpec) { 9557 if (RBraceLoc.isValid()) { 9558 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9559 LSDecl->setRBraceLoc(RBraceLoc); 9560 } 9561 PopDeclContext(); 9562 } 9563 return LinkageSpec; 9564} 9565 9566/// \brief Perform semantic analysis for the variable declaration that 9567/// occurs within a C++ catch clause, returning the newly-created 9568/// variable. 9569VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9570 TypeSourceInfo *TInfo, 9571 SourceLocation StartLoc, 9572 SourceLocation Loc, 9573 IdentifierInfo *Name) { 9574 bool Invalid = false; 9575 QualType ExDeclType = TInfo->getType(); 9576 9577 // Arrays and functions decay. 9578 if (ExDeclType->isArrayType()) 9579 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9580 else if (ExDeclType->isFunctionType()) 9581 ExDeclType = Context.getPointerType(ExDeclType); 9582 9583 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9584 // The exception-declaration shall not denote a pointer or reference to an 9585 // incomplete type, other than [cv] void*. 9586 // N2844 forbids rvalue references. 9587 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9588 Diag(Loc, diag::err_catch_rvalue_ref); 9589 Invalid = true; 9590 } 9591 9592 QualType BaseType = ExDeclType; 9593 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9594 unsigned DK = diag::err_catch_incomplete; 9595 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9596 BaseType = Ptr->getPointeeType(); 9597 Mode = 1; 9598 DK = diag::err_catch_incomplete_ptr; 9599 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9600 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9601 BaseType = Ref->getPointeeType(); 9602 Mode = 2; 9603 DK = diag::err_catch_incomplete_ref; 9604 } 9605 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9606 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9607 Invalid = true; 9608 9609 if (!Invalid && !ExDeclType->isDependentType() && 9610 RequireNonAbstractType(Loc, ExDeclType, 9611 diag::err_abstract_type_in_decl, 9612 AbstractVariableType)) 9613 Invalid = true; 9614 9615 // Only the non-fragile NeXT runtime currently supports C++ catches 9616 // of ObjC types, and no runtime supports catching ObjC types by value. 9617 if (!Invalid && getLangOpts().ObjC1) { 9618 QualType T = ExDeclType; 9619 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9620 T = RT->getPointeeType(); 9621 9622 if (T->isObjCObjectType()) { 9623 Diag(Loc, diag::err_objc_object_catch); 9624 Invalid = true; 9625 } else if (T->isObjCObjectPointerType()) { 9626 // FIXME: should this be a test for macosx-fragile specifically? 9627 if (getLangOpts().ObjCRuntime.isFragile()) 9628 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9629 } 9630 } 9631 9632 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9633 ExDeclType, TInfo, SC_None, SC_None); 9634 ExDecl->setExceptionVariable(true); 9635 9636 // In ARC, infer 'retaining' for variables of retainable type. 9637 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9638 Invalid = true; 9639 9640 if (!Invalid && !ExDeclType->isDependentType()) { 9641 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9642 // C++ [except.handle]p16: 9643 // The object declared in an exception-declaration or, if the 9644 // exception-declaration does not specify a name, a temporary (12.2) is 9645 // copy-initialized (8.5) from the exception object. [...] 9646 // The object is destroyed when the handler exits, after the destruction 9647 // of any automatic objects initialized within the handler. 9648 // 9649 // We just pretend to initialize the object with itself, then make sure 9650 // it can be destroyed later. 9651 QualType initType = ExDeclType; 9652 9653 InitializedEntity entity = 9654 InitializedEntity::InitializeVariable(ExDecl); 9655 InitializationKind initKind = 9656 InitializationKind::CreateCopy(Loc, SourceLocation()); 9657 9658 Expr *opaqueValue = 9659 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9660 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9661 ExprResult result = sequence.Perform(*this, entity, initKind, 9662 MultiExprArg(&opaqueValue, 1)); 9663 if (result.isInvalid()) 9664 Invalid = true; 9665 else { 9666 // If the constructor used was non-trivial, set this as the 9667 // "initializer". 9668 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9669 if (!construct->getConstructor()->isTrivial()) { 9670 Expr *init = MaybeCreateExprWithCleanups(construct); 9671 ExDecl->setInit(init); 9672 } 9673 9674 // And make sure it's destructable. 9675 FinalizeVarWithDestructor(ExDecl, recordType); 9676 } 9677 } 9678 } 9679 9680 if (Invalid) 9681 ExDecl->setInvalidDecl(); 9682 9683 return ExDecl; 9684} 9685 9686/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9687/// handler. 9688Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9689 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9690 bool Invalid = D.isInvalidType(); 9691 9692 // Check for unexpanded parameter packs. 9693 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9694 UPPC_ExceptionType)) { 9695 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9696 D.getIdentifierLoc()); 9697 Invalid = true; 9698 } 9699 9700 IdentifierInfo *II = D.getIdentifier(); 9701 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9702 LookupOrdinaryName, 9703 ForRedeclaration)) { 9704 // The scope should be freshly made just for us. There is just no way 9705 // it contains any previous declaration. 9706 assert(!S->isDeclScope(PrevDecl)); 9707 if (PrevDecl->isTemplateParameter()) { 9708 // Maybe we will complain about the shadowed template parameter. 9709 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9710 PrevDecl = 0; 9711 } 9712 } 9713 9714 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9715 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9716 << D.getCXXScopeSpec().getRange(); 9717 Invalid = true; 9718 } 9719 9720 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9721 D.getLocStart(), 9722 D.getIdentifierLoc(), 9723 D.getIdentifier()); 9724 if (Invalid) 9725 ExDecl->setInvalidDecl(); 9726 9727 // Add the exception declaration into this scope. 9728 if (II) 9729 PushOnScopeChains(ExDecl, S); 9730 else 9731 CurContext->addDecl(ExDecl); 9732 9733 ProcessDeclAttributes(S, ExDecl, D); 9734 return ExDecl; 9735} 9736 9737Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9738 Expr *AssertExpr, 9739 Expr *AssertMessageExpr, 9740 SourceLocation RParenLoc) { 9741 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 9742 9743 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9744 return 0; 9745 9746 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 9747 AssertMessage, RParenLoc, false); 9748} 9749 9750Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9751 Expr *AssertExpr, 9752 StringLiteral *AssertMessage, 9753 SourceLocation RParenLoc, 9754 bool Failed) { 9755 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 9756 !Failed) { 9757 // In a static_assert-declaration, the constant-expression shall be a 9758 // constant expression that can be contextually converted to bool. 9759 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9760 if (Converted.isInvalid()) 9761 Failed = true; 9762 9763 llvm::APSInt Cond; 9764 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 9765 diag::err_static_assert_expression_is_not_constant, 9766 /*AllowFold=*/false).isInvalid()) 9767 Failed = true; 9768 9769 if (!Failed && !Cond) { 9770 llvm::SmallString<256> MsgBuffer; 9771 llvm::raw_svector_ostream Msg(MsgBuffer); 9772 AssertMessage->printPretty(Msg, Context, 0, getPrintingPolicy()); 9773 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9774 << Msg.str() << AssertExpr->getSourceRange(); 9775 Failed = true; 9776 } 9777 } 9778 9779 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9780 AssertExpr, AssertMessage, RParenLoc, 9781 Failed); 9782 9783 CurContext->addDecl(Decl); 9784 return Decl; 9785} 9786 9787/// \brief Perform semantic analysis of the given friend type declaration. 9788/// 9789/// \returns A friend declaration that. 9790FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9791 SourceLocation FriendLoc, 9792 TypeSourceInfo *TSInfo) { 9793 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9794 9795 QualType T = TSInfo->getType(); 9796 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9797 9798 // C++03 [class.friend]p2: 9799 // An elaborated-type-specifier shall be used in a friend declaration 9800 // for a class.* 9801 // 9802 // * The class-key of the elaborated-type-specifier is required. 9803 if (!ActiveTemplateInstantiations.empty()) { 9804 // Do not complain about the form of friend template types during 9805 // template instantiation; we will already have complained when the 9806 // template was declared. 9807 } else if (!T->isElaboratedTypeSpecifier()) { 9808 // If we evaluated the type to a record type, suggest putting 9809 // a tag in front. 9810 if (const RecordType *RT = T->getAs<RecordType>()) { 9811 RecordDecl *RD = RT->getDecl(); 9812 9813 std::string InsertionText = std::string(" ") + RD->getKindName(); 9814 9815 Diag(TypeRange.getBegin(), 9816 getLangOpts().CPlusPlus0x ? 9817 diag::warn_cxx98_compat_unelaborated_friend_type : 9818 diag::ext_unelaborated_friend_type) 9819 << (unsigned) RD->getTagKind() 9820 << T 9821 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9822 InsertionText); 9823 } else { 9824 Diag(FriendLoc, 9825 getLangOpts().CPlusPlus0x ? 9826 diag::warn_cxx98_compat_nonclass_type_friend : 9827 diag::ext_nonclass_type_friend) 9828 << T 9829 << SourceRange(FriendLoc, TypeRange.getEnd()); 9830 } 9831 } else if (T->getAs<EnumType>()) { 9832 Diag(FriendLoc, 9833 getLangOpts().CPlusPlus0x ? 9834 diag::warn_cxx98_compat_enum_friend : 9835 diag::ext_enum_friend) 9836 << T 9837 << SourceRange(FriendLoc, TypeRange.getEnd()); 9838 } 9839 9840 // C++0x [class.friend]p3: 9841 // If the type specifier in a friend declaration designates a (possibly 9842 // cv-qualified) class type, that class is declared as a friend; otherwise, 9843 // the friend declaration is ignored. 9844 9845 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9846 // in [class.friend]p3 that we do not implement. 9847 9848 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9849} 9850 9851/// Handle a friend tag declaration where the scope specifier was 9852/// templated. 9853Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9854 unsigned TagSpec, SourceLocation TagLoc, 9855 CXXScopeSpec &SS, 9856 IdentifierInfo *Name, SourceLocation NameLoc, 9857 AttributeList *Attr, 9858 MultiTemplateParamsArg TempParamLists) { 9859 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9860 9861 bool isExplicitSpecialization = false; 9862 bool Invalid = false; 9863 9864 if (TemplateParameterList *TemplateParams 9865 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9866 TempParamLists.get(), 9867 TempParamLists.size(), 9868 /*friend*/ true, 9869 isExplicitSpecialization, 9870 Invalid)) { 9871 if (TemplateParams->size() > 0) { 9872 // This is a declaration of a class template. 9873 if (Invalid) 9874 return 0; 9875 9876 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9877 SS, Name, NameLoc, Attr, 9878 TemplateParams, AS_public, 9879 /*ModulePrivateLoc=*/SourceLocation(), 9880 TempParamLists.size() - 1, 9881 (TemplateParameterList**) TempParamLists.release()).take(); 9882 } else { 9883 // The "template<>" header is extraneous. 9884 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9885 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9886 isExplicitSpecialization = true; 9887 } 9888 } 9889 9890 if (Invalid) return 0; 9891 9892 bool isAllExplicitSpecializations = true; 9893 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9894 if (TempParamLists.get()[I]->size()) { 9895 isAllExplicitSpecializations = false; 9896 break; 9897 } 9898 } 9899 9900 // FIXME: don't ignore attributes. 9901 9902 // If it's explicit specializations all the way down, just forget 9903 // about the template header and build an appropriate non-templated 9904 // friend. TODO: for source fidelity, remember the headers. 9905 if (isAllExplicitSpecializations) { 9906 if (SS.isEmpty()) { 9907 bool Owned = false; 9908 bool IsDependent = false; 9909 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9910 Attr, AS_public, 9911 /*ModulePrivateLoc=*/SourceLocation(), 9912 MultiTemplateParamsArg(), Owned, IsDependent, 9913 /*ScopedEnumKWLoc=*/SourceLocation(), 9914 /*ScopedEnumUsesClassTag=*/false, 9915 /*UnderlyingType=*/TypeResult()); 9916 } 9917 9918 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9919 ElaboratedTypeKeyword Keyword 9920 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9921 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9922 *Name, NameLoc); 9923 if (T.isNull()) 9924 return 0; 9925 9926 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9927 if (isa<DependentNameType>(T)) { 9928 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9929 TL.setElaboratedKeywordLoc(TagLoc); 9930 TL.setQualifierLoc(QualifierLoc); 9931 TL.setNameLoc(NameLoc); 9932 } else { 9933 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9934 TL.setElaboratedKeywordLoc(TagLoc); 9935 TL.setQualifierLoc(QualifierLoc); 9936 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9937 } 9938 9939 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9940 TSI, FriendLoc); 9941 Friend->setAccess(AS_public); 9942 CurContext->addDecl(Friend); 9943 return Friend; 9944 } 9945 9946 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9947 9948 9949 9950 // Handle the case of a templated-scope friend class. e.g. 9951 // template <class T> class A<T>::B; 9952 // FIXME: we don't support these right now. 9953 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9954 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9955 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9956 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9957 TL.setElaboratedKeywordLoc(TagLoc); 9958 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9959 TL.setNameLoc(NameLoc); 9960 9961 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9962 TSI, FriendLoc); 9963 Friend->setAccess(AS_public); 9964 Friend->setUnsupportedFriend(true); 9965 CurContext->addDecl(Friend); 9966 return Friend; 9967} 9968 9969 9970/// Handle a friend type declaration. This works in tandem with 9971/// ActOnTag. 9972/// 9973/// Notes on friend class templates: 9974/// 9975/// We generally treat friend class declarations as if they were 9976/// declaring a class. So, for example, the elaborated type specifier 9977/// in a friend declaration is required to obey the restrictions of a 9978/// class-head (i.e. no typedefs in the scope chain), template 9979/// parameters are required to match up with simple template-ids, &c. 9980/// However, unlike when declaring a template specialization, it's 9981/// okay to refer to a template specialization without an empty 9982/// template parameter declaration, e.g. 9983/// friend class A<T>::B<unsigned>; 9984/// We permit this as a special case; if there are any template 9985/// parameters present at all, require proper matching, i.e. 9986/// template <> template \<class T> friend class A<int>::B; 9987Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9988 MultiTemplateParamsArg TempParams) { 9989 SourceLocation Loc = DS.getLocStart(); 9990 9991 assert(DS.isFriendSpecified()); 9992 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9993 9994 // Try to convert the decl specifier to a type. This works for 9995 // friend templates because ActOnTag never produces a ClassTemplateDecl 9996 // for a TUK_Friend. 9997 Declarator TheDeclarator(DS, Declarator::MemberContext); 9998 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9999 QualType T = TSI->getType(); 10000 if (TheDeclarator.isInvalidType()) 10001 return 0; 10002 10003 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10004 return 0; 10005 10006 // This is definitely an error in C++98. It's probably meant to 10007 // be forbidden in C++0x, too, but the specification is just 10008 // poorly written. 10009 // 10010 // The problem is with declarations like the following: 10011 // template <T> friend A<T>::foo; 10012 // where deciding whether a class C is a friend or not now hinges 10013 // on whether there exists an instantiation of A that causes 10014 // 'foo' to equal C. There are restrictions on class-heads 10015 // (which we declare (by fiat) elaborated friend declarations to 10016 // be) that makes this tractable. 10017 // 10018 // FIXME: handle "template <> friend class A<T>;", which 10019 // is possibly well-formed? Who even knows? 10020 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10021 Diag(Loc, diag::err_tagless_friend_type_template) 10022 << DS.getSourceRange(); 10023 return 0; 10024 } 10025 10026 // C++98 [class.friend]p1: A friend of a class is a function 10027 // or class that is not a member of the class . . . 10028 // This is fixed in DR77, which just barely didn't make the C++03 10029 // deadline. It's also a very silly restriction that seriously 10030 // affects inner classes and which nobody else seems to implement; 10031 // thus we never diagnose it, not even in -pedantic. 10032 // 10033 // But note that we could warn about it: it's always useless to 10034 // friend one of your own members (it's not, however, worthless to 10035 // friend a member of an arbitrary specialization of your template). 10036 10037 Decl *D; 10038 if (unsigned NumTempParamLists = TempParams.size()) 10039 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10040 NumTempParamLists, 10041 TempParams.release(), 10042 TSI, 10043 DS.getFriendSpecLoc()); 10044 else 10045 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10046 10047 if (!D) 10048 return 0; 10049 10050 D->setAccess(AS_public); 10051 CurContext->addDecl(D); 10052 10053 return D; 10054} 10055 10056Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10057 MultiTemplateParamsArg TemplateParams) { 10058 const DeclSpec &DS = D.getDeclSpec(); 10059 10060 assert(DS.isFriendSpecified()); 10061 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10062 10063 SourceLocation Loc = D.getIdentifierLoc(); 10064 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10065 10066 // C++ [class.friend]p1 10067 // A friend of a class is a function or class.... 10068 // Note that this sees through typedefs, which is intended. 10069 // It *doesn't* see through dependent types, which is correct 10070 // according to [temp.arg.type]p3: 10071 // If a declaration acquires a function type through a 10072 // type dependent on a template-parameter and this causes 10073 // a declaration that does not use the syntactic form of a 10074 // function declarator to have a function type, the program 10075 // is ill-formed. 10076 if (!TInfo->getType()->isFunctionType()) { 10077 Diag(Loc, diag::err_unexpected_friend); 10078 10079 // It might be worthwhile to try to recover by creating an 10080 // appropriate declaration. 10081 return 0; 10082 } 10083 10084 // C++ [namespace.memdef]p3 10085 // - If a friend declaration in a non-local class first declares a 10086 // class or function, the friend class or function is a member 10087 // of the innermost enclosing namespace. 10088 // - The name of the friend is not found by simple name lookup 10089 // until a matching declaration is provided in that namespace 10090 // scope (either before or after the class declaration granting 10091 // friendship). 10092 // - If a friend function is called, its name may be found by the 10093 // name lookup that considers functions from namespaces and 10094 // classes associated with the types of the function arguments. 10095 // - When looking for a prior declaration of a class or a function 10096 // declared as a friend, scopes outside the innermost enclosing 10097 // namespace scope are not considered. 10098 10099 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10100 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10101 DeclarationName Name = NameInfo.getName(); 10102 assert(Name); 10103 10104 // Check for unexpanded parameter packs. 10105 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10106 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10107 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10108 return 0; 10109 10110 // The context we found the declaration in, or in which we should 10111 // create the declaration. 10112 DeclContext *DC; 10113 Scope *DCScope = S; 10114 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10115 ForRedeclaration); 10116 10117 // FIXME: there are different rules in local classes 10118 10119 // There are four cases here. 10120 // - There's no scope specifier, in which case we just go to the 10121 // appropriate scope and look for a function or function template 10122 // there as appropriate. 10123 // Recover from invalid scope qualifiers as if they just weren't there. 10124 if (SS.isInvalid() || !SS.isSet()) { 10125 // C++0x [namespace.memdef]p3: 10126 // If the name in a friend declaration is neither qualified nor 10127 // a template-id and the declaration is a function or an 10128 // elaborated-type-specifier, the lookup to determine whether 10129 // the entity has been previously declared shall not consider 10130 // any scopes outside the innermost enclosing namespace. 10131 // C++0x [class.friend]p11: 10132 // If a friend declaration appears in a local class and the name 10133 // specified is an unqualified name, a prior declaration is 10134 // looked up without considering scopes that are outside the 10135 // innermost enclosing non-class scope. For a friend function 10136 // declaration, if there is no prior declaration, the program is 10137 // ill-formed. 10138 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10139 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10140 10141 // Find the appropriate context according to the above. 10142 DC = CurContext; 10143 while (true) { 10144 // Skip class contexts. If someone can cite chapter and verse 10145 // for this behavior, that would be nice --- it's what GCC and 10146 // EDG do, and it seems like a reasonable intent, but the spec 10147 // really only says that checks for unqualified existing 10148 // declarations should stop at the nearest enclosing namespace, 10149 // not that they should only consider the nearest enclosing 10150 // namespace. 10151 while (DC->isRecord() || DC->isTransparentContext()) 10152 DC = DC->getParent(); 10153 10154 LookupQualifiedName(Previous, DC); 10155 10156 // TODO: decide what we think about using declarations. 10157 if (isLocal || !Previous.empty()) 10158 break; 10159 10160 if (isTemplateId) { 10161 if (isa<TranslationUnitDecl>(DC)) break; 10162 } else { 10163 if (DC->isFileContext()) break; 10164 } 10165 DC = DC->getParent(); 10166 } 10167 10168 // C++ [class.friend]p1: A friend of a class is a function or 10169 // class that is not a member of the class . . . 10170 // C++11 changes this for both friend types and functions. 10171 // Most C++ 98 compilers do seem to give an error here, so 10172 // we do, too. 10173 if (!Previous.empty() && DC->Equals(CurContext)) 10174 Diag(DS.getFriendSpecLoc(), 10175 getLangOpts().CPlusPlus0x ? 10176 diag::warn_cxx98_compat_friend_is_member : 10177 diag::err_friend_is_member); 10178 10179 DCScope = getScopeForDeclContext(S, DC); 10180 10181 // C++ [class.friend]p6: 10182 // A function can be defined in a friend declaration of a class if and 10183 // only if the class is a non-local class (9.8), the function name is 10184 // unqualified, and the function has namespace scope. 10185 if (isLocal && D.isFunctionDefinition()) { 10186 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10187 } 10188 10189 // - There's a non-dependent scope specifier, in which case we 10190 // compute it and do a previous lookup there for a function 10191 // or function template. 10192 } else if (!SS.getScopeRep()->isDependent()) { 10193 DC = computeDeclContext(SS); 10194 if (!DC) return 0; 10195 10196 if (RequireCompleteDeclContext(SS, DC)) return 0; 10197 10198 LookupQualifiedName(Previous, DC); 10199 10200 // Ignore things found implicitly in the wrong scope. 10201 // TODO: better diagnostics for this case. Suggesting the right 10202 // qualified scope would be nice... 10203 LookupResult::Filter F = Previous.makeFilter(); 10204 while (F.hasNext()) { 10205 NamedDecl *D = F.next(); 10206 if (!DC->InEnclosingNamespaceSetOf( 10207 D->getDeclContext()->getRedeclContext())) 10208 F.erase(); 10209 } 10210 F.done(); 10211 10212 if (Previous.empty()) { 10213 D.setInvalidType(); 10214 Diag(Loc, diag::err_qualified_friend_not_found) 10215 << Name << TInfo->getType(); 10216 return 0; 10217 } 10218 10219 // C++ [class.friend]p1: A friend of a class is a function or 10220 // class that is not a member of the class . . . 10221 if (DC->Equals(CurContext)) 10222 Diag(DS.getFriendSpecLoc(), 10223 getLangOpts().CPlusPlus0x ? 10224 diag::warn_cxx98_compat_friend_is_member : 10225 diag::err_friend_is_member); 10226 10227 if (D.isFunctionDefinition()) { 10228 // C++ [class.friend]p6: 10229 // A function can be defined in a friend declaration of a class if and 10230 // only if the class is a non-local class (9.8), the function name is 10231 // unqualified, and the function has namespace scope. 10232 SemaDiagnosticBuilder DB 10233 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10234 10235 DB << SS.getScopeRep(); 10236 if (DC->isFileContext()) 10237 DB << FixItHint::CreateRemoval(SS.getRange()); 10238 SS.clear(); 10239 } 10240 10241 // - There's a scope specifier that does not match any template 10242 // parameter lists, in which case we use some arbitrary context, 10243 // create a method or method template, and wait for instantiation. 10244 // - There's a scope specifier that does match some template 10245 // parameter lists, which we don't handle right now. 10246 } else { 10247 if (D.isFunctionDefinition()) { 10248 // C++ [class.friend]p6: 10249 // A function can be defined in a friend declaration of a class if and 10250 // only if the class is a non-local class (9.8), the function name is 10251 // unqualified, and the function has namespace scope. 10252 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10253 << SS.getScopeRep(); 10254 } 10255 10256 DC = CurContext; 10257 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10258 } 10259 10260 if (!DC->isRecord()) { 10261 // This implies that it has to be an operator or function. 10262 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10263 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10264 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10265 Diag(Loc, diag::err_introducing_special_friend) << 10266 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10267 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10268 return 0; 10269 } 10270 } 10271 10272 // FIXME: This is an egregious hack to cope with cases where the scope stack 10273 // does not contain the declaration context, i.e., in an out-of-line 10274 // definition of a class. 10275 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10276 if (!DCScope) { 10277 FakeDCScope.setEntity(DC); 10278 DCScope = &FakeDCScope; 10279 } 10280 10281 bool AddToScope = true; 10282 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10283 move(TemplateParams), AddToScope); 10284 if (!ND) return 0; 10285 10286 assert(ND->getDeclContext() == DC); 10287 assert(ND->getLexicalDeclContext() == CurContext); 10288 10289 // Add the function declaration to the appropriate lookup tables, 10290 // adjusting the redeclarations list as necessary. We don't 10291 // want to do this yet if the friending class is dependent. 10292 // 10293 // Also update the scope-based lookup if the target context's 10294 // lookup context is in lexical scope. 10295 if (!CurContext->isDependentContext()) { 10296 DC = DC->getRedeclContext(); 10297 DC->makeDeclVisibleInContext(ND); 10298 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10299 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10300 } 10301 10302 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10303 D.getIdentifierLoc(), ND, 10304 DS.getFriendSpecLoc()); 10305 FrD->setAccess(AS_public); 10306 CurContext->addDecl(FrD); 10307 10308 if (ND->isInvalidDecl()) 10309 FrD->setInvalidDecl(); 10310 else { 10311 FunctionDecl *FD; 10312 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10313 FD = FTD->getTemplatedDecl(); 10314 else 10315 FD = cast<FunctionDecl>(ND); 10316 10317 // Mark templated-scope function declarations as unsupported. 10318 if (FD->getNumTemplateParameterLists()) 10319 FrD->setUnsupportedFriend(true); 10320 } 10321 10322 return ND; 10323} 10324 10325void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10326 AdjustDeclIfTemplate(Dcl); 10327 10328 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10329 if (!Fn) { 10330 Diag(DelLoc, diag::err_deleted_non_function); 10331 return; 10332 } 10333 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10334 // Don't consider the implicit declaration we generate for explicit 10335 // specializations. FIXME: Do not generate these implicit declarations. 10336 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 10337 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 10338 Diag(DelLoc, diag::err_deleted_decl_not_first); 10339 Diag(Prev->getLocation(), diag::note_previous_declaration); 10340 } 10341 // If the declaration wasn't the first, we delete the function anyway for 10342 // recovery. 10343 } 10344 Fn->setDeletedAsWritten(); 10345 10346 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10347 if (!MD) 10348 return; 10349 10350 // A deleted special member function is trivial if the corresponding 10351 // implicitly-declared function would have been. 10352 switch (getSpecialMember(MD)) { 10353 case CXXInvalid: 10354 break; 10355 case CXXDefaultConstructor: 10356 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor()); 10357 break; 10358 case CXXCopyConstructor: 10359 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor()); 10360 break; 10361 case CXXMoveConstructor: 10362 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor()); 10363 break; 10364 case CXXCopyAssignment: 10365 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 10366 break; 10367 case CXXMoveAssignment: 10368 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 10369 break; 10370 case CXXDestructor: 10371 MD->setTrivial(MD->getParent()->hasTrivialDestructor()); 10372 break; 10373 } 10374} 10375 10376void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10377 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10378 10379 if (MD) { 10380 if (MD->getParent()->isDependentType()) { 10381 MD->setDefaulted(); 10382 MD->setExplicitlyDefaulted(); 10383 return; 10384 } 10385 10386 CXXSpecialMember Member = getSpecialMember(MD); 10387 if (Member == CXXInvalid) { 10388 Diag(DefaultLoc, diag::err_default_special_members); 10389 return; 10390 } 10391 10392 MD->setDefaulted(); 10393 MD->setExplicitlyDefaulted(); 10394 10395 // If this definition appears within the record, do the checking when 10396 // the record is complete. 10397 const FunctionDecl *Primary = MD; 10398 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10399 // Find the uninstantiated declaration that actually had the '= default' 10400 // on it. 10401 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10402 10403 if (Primary == Primary->getCanonicalDecl()) 10404 return; 10405 10406 switch (Member) { 10407 case CXXDefaultConstructor: { 10408 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10409 CheckExplicitlyDefaultedSpecialMember(CD); 10410 if (!CD->isInvalidDecl()) 10411 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10412 break; 10413 } 10414 10415 case CXXCopyConstructor: { 10416 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10417 CheckExplicitlyDefaultedSpecialMember(CD); 10418 if (!CD->isInvalidDecl()) 10419 DefineImplicitCopyConstructor(DefaultLoc, CD); 10420 break; 10421 } 10422 10423 case CXXCopyAssignment: { 10424 CheckExplicitlyDefaultedSpecialMember(MD); 10425 if (!MD->isInvalidDecl()) 10426 DefineImplicitCopyAssignment(DefaultLoc, MD); 10427 break; 10428 } 10429 10430 case CXXDestructor: { 10431 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10432 CheckExplicitlyDefaultedSpecialMember(DD); 10433 if (!DD->isInvalidDecl()) 10434 DefineImplicitDestructor(DefaultLoc, DD); 10435 break; 10436 } 10437 10438 case CXXMoveConstructor: { 10439 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10440 CheckExplicitlyDefaultedSpecialMember(CD); 10441 if (!CD->isInvalidDecl()) 10442 DefineImplicitMoveConstructor(DefaultLoc, CD); 10443 break; 10444 } 10445 10446 case CXXMoveAssignment: { 10447 CheckExplicitlyDefaultedSpecialMember(MD); 10448 if (!MD->isInvalidDecl()) 10449 DefineImplicitMoveAssignment(DefaultLoc, MD); 10450 break; 10451 } 10452 10453 case CXXInvalid: 10454 llvm_unreachable("Invalid special member."); 10455 } 10456 } else { 10457 Diag(DefaultLoc, diag::err_default_special_members); 10458 } 10459} 10460 10461static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10462 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10463 Stmt *SubStmt = *CI; 10464 if (!SubStmt) 10465 continue; 10466 if (isa<ReturnStmt>(SubStmt)) 10467 Self.Diag(SubStmt->getLocStart(), 10468 diag::err_return_in_constructor_handler); 10469 if (!isa<Expr>(SubStmt)) 10470 SearchForReturnInStmt(Self, SubStmt); 10471 } 10472} 10473 10474void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10475 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10476 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10477 SearchForReturnInStmt(*this, Handler); 10478 } 10479} 10480 10481bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10482 const CXXMethodDecl *Old) { 10483 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10484 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10485 10486 if (Context.hasSameType(NewTy, OldTy) || 10487 NewTy->isDependentType() || OldTy->isDependentType()) 10488 return false; 10489 10490 // Check if the return types are covariant 10491 QualType NewClassTy, OldClassTy; 10492 10493 /// Both types must be pointers or references to classes. 10494 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10495 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10496 NewClassTy = NewPT->getPointeeType(); 10497 OldClassTy = OldPT->getPointeeType(); 10498 } 10499 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10500 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10501 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10502 NewClassTy = NewRT->getPointeeType(); 10503 OldClassTy = OldRT->getPointeeType(); 10504 } 10505 } 10506 } 10507 10508 // The return types aren't either both pointers or references to a class type. 10509 if (NewClassTy.isNull()) { 10510 Diag(New->getLocation(), 10511 diag::err_different_return_type_for_overriding_virtual_function) 10512 << New->getDeclName() << NewTy << OldTy; 10513 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10514 10515 return true; 10516 } 10517 10518 // C++ [class.virtual]p6: 10519 // If the return type of D::f differs from the return type of B::f, the 10520 // class type in the return type of D::f shall be complete at the point of 10521 // declaration of D::f or shall be the class type D. 10522 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10523 if (!RT->isBeingDefined() && 10524 RequireCompleteType(New->getLocation(), NewClassTy, 10525 diag::err_covariant_return_incomplete, 10526 New->getDeclName())) 10527 return true; 10528 } 10529 10530 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10531 // Check if the new class derives from the old class. 10532 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10533 Diag(New->getLocation(), 10534 diag::err_covariant_return_not_derived) 10535 << New->getDeclName() << NewTy << OldTy; 10536 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10537 return true; 10538 } 10539 10540 // Check if we the conversion from derived to base is valid. 10541 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10542 diag::err_covariant_return_inaccessible_base, 10543 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10544 // FIXME: Should this point to the return type? 10545 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10546 // FIXME: this note won't trigger for delayed access control 10547 // diagnostics, and it's impossible to get an undelayed error 10548 // here from access control during the original parse because 10549 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10550 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10551 return true; 10552 } 10553 } 10554 10555 // The qualifiers of the return types must be the same. 10556 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10557 Diag(New->getLocation(), 10558 diag::err_covariant_return_type_different_qualifications) 10559 << New->getDeclName() << NewTy << OldTy; 10560 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10561 return true; 10562 }; 10563 10564 10565 // The new class type must have the same or less qualifiers as the old type. 10566 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10567 Diag(New->getLocation(), 10568 diag::err_covariant_return_type_class_type_more_qualified) 10569 << New->getDeclName() << NewTy << OldTy; 10570 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10571 return true; 10572 }; 10573 10574 return false; 10575} 10576 10577/// \brief Mark the given method pure. 10578/// 10579/// \param Method the method to be marked pure. 10580/// 10581/// \param InitRange the source range that covers the "0" initializer. 10582bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10583 SourceLocation EndLoc = InitRange.getEnd(); 10584 if (EndLoc.isValid()) 10585 Method->setRangeEnd(EndLoc); 10586 10587 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10588 Method->setPure(); 10589 return false; 10590 } 10591 10592 if (!Method->isInvalidDecl()) 10593 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10594 << Method->getDeclName() << InitRange; 10595 return true; 10596} 10597 10598/// \brief Determine whether the given declaration is a static data member. 10599static bool isStaticDataMember(Decl *D) { 10600 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10601 if (!Var) 10602 return false; 10603 10604 return Var->isStaticDataMember(); 10605} 10606/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10607/// an initializer for the out-of-line declaration 'Dcl'. The scope 10608/// is a fresh scope pushed for just this purpose. 10609/// 10610/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10611/// static data member of class X, names should be looked up in the scope of 10612/// class X. 10613void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10614 // If there is no declaration, there was an error parsing it. 10615 if (D == 0 || D->isInvalidDecl()) return; 10616 10617 // We should only get called for declarations with scope specifiers, like: 10618 // int foo::bar; 10619 assert(D->isOutOfLine()); 10620 EnterDeclaratorContext(S, D->getDeclContext()); 10621 10622 // If we are parsing the initializer for a static data member, push a 10623 // new expression evaluation context that is associated with this static 10624 // data member. 10625 if (isStaticDataMember(D)) 10626 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10627} 10628 10629/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10630/// initializer for the out-of-line declaration 'D'. 10631void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10632 // If there is no declaration, there was an error parsing it. 10633 if (D == 0 || D->isInvalidDecl()) return; 10634 10635 if (isStaticDataMember(D)) 10636 PopExpressionEvaluationContext(); 10637 10638 assert(D->isOutOfLine()); 10639 ExitDeclaratorContext(S); 10640} 10641 10642/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10643/// C++ if/switch/while/for statement. 10644/// e.g: "if (int x = f()) {...}" 10645DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10646 // C++ 6.4p2: 10647 // The declarator shall not specify a function or an array. 10648 // The type-specifier-seq shall not contain typedef and shall not declare a 10649 // new class or enumeration. 10650 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10651 "Parser allowed 'typedef' as storage class of condition decl."); 10652 10653 Decl *Dcl = ActOnDeclarator(S, D); 10654 if (!Dcl) 10655 return true; 10656 10657 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10658 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10659 << D.getSourceRange(); 10660 return true; 10661 } 10662 10663 return Dcl; 10664} 10665 10666void Sema::LoadExternalVTableUses() { 10667 if (!ExternalSource) 10668 return; 10669 10670 SmallVector<ExternalVTableUse, 4> VTables; 10671 ExternalSource->ReadUsedVTables(VTables); 10672 SmallVector<VTableUse, 4> NewUses; 10673 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10674 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10675 = VTablesUsed.find(VTables[I].Record); 10676 // Even if a definition wasn't required before, it may be required now. 10677 if (Pos != VTablesUsed.end()) { 10678 if (!Pos->second && VTables[I].DefinitionRequired) 10679 Pos->second = true; 10680 continue; 10681 } 10682 10683 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10684 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10685 } 10686 10687 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10688} 10689 10690void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10691 bool DefinitionRequired) { 10692 // Ignore any vtable uses in unevaluated operands or for classes that do 10693 // not have a vtable. 10694 if (!Class->isDynamicClass() || Class->isDependentContext() || 10695 CurContext->isDependentContext() || 10696 ExprEvalContexts.back().Context == Unevaluated) 10697 return; 10698 10699 // Try to insert this class into the map. 10700 LoadExternalVTableUses(); 10701 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10702 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10703 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10704 if (!Pos.second) { 10705 // If we already had an entry, check to see if we are promoting this vtable 10706 // to required a definition. If so, we need to reappend to the VTableUses 10707 // list, since we may have already processed the first entry. 10708 if (DefinitionRequired && !Pos.first->second) { 10709 Pos.first->second = true; 10710 } else { 10711 // Otherwise, we can early exit. 10712 return; 10713 } 10714 } 10715 10716 // Local classes need to have their virtual members marked 10717 // immediately. For all other classes, we mark their virtual members 10718 // at the end of the translation unit. 10719 if (Class->isLocalClass()) 10720 MarkVirtualMembersReferenced(Loc, Class); 10721 else 10722 VTableUses.push_back(std::make_pair(Class, Loc)); 10723} 10724 10725bool Sema::DefineUsedVTables() { 10726 LoadExternalVTableUses(); 10727 if (VTableUses.empty()) 10728 return false; 10729 10730 // Note: The VTableUses vector could grow as a result of marking 10731 // the members of a class as "used", so we check the size each 10732 // time through the loop and prefer indices (with are stable) to 10733 // iterators (which are not). 10734 bool DefinedAnything = false; 10735 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10736 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10737 if (!Class) 10738 continue; 10739 10740 SourceLocation Loc = VTableUses[I].second; 10741 10742 // If this class has a key function, but that key function is 10743 // defined in another translation unit, we don't need to emit the 10744 // vtable even though we're using it. 10745 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10746 if (KeyFunction && !KeyFunction->hasBody()) { 10747 switch (KeyFunction->getTemplateSpecializationKind()) { 10748 case TSK_Undeclared: 10749 case TSK_ExplicitSpecialization: 10750 case TSK_ExplicitInstantiationDeclaration: 10751 // The key function is in another translation unit. 10752 continue; 10753 10754 case TSK_ExplicitInstantiationDefinition: 10755 case TSK_ImplicitInstantiation: 10756 // We will be instantiating the key function. 10757 break; 10758 } 10759 } else if (!KeyFunction) { 10760 // If we have a class with no key function that is the subject 10761 // of an explicit instantiation declaration, suppress the 10762 // vtable; it will live with the explicit instantiation 10763 // definition. 10764 bool IsExplicitInstantiationDeclaration 10765 = Class->getTemplateSpecializationKind() 10766 == TSK_ExplicitInstantiationDeclaration; 10767 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10768 REnd = Class->redecls_end(); 10769 R != REnd; ++R) { 10770 TemplateSpecializationKind TSK 10771 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10772 if (TSK == TSK_ExplicitInstantiationDeclaration) 10773 IsExplicitInstantiationDeclaration = true; 10774 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10775 IsExplicitInstantiationDeclaration = false; 10776 break; 10777 } 10778 } 10779 10780 if (IsExplicitInstantiationDeclaration) 10781 continue; 10782 } 10783 10784 // Mark all of the virtual members of this class as referenced, so 10785 // that we can build a vtable. Then, tell the AST consumer that a 10786 // vtable for this class is required. 10787 DefinedAnything = true; 10788 MarkVirtualMembersReferenced(Loc, Class); 10789 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10790 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10791 10792 // Optionally warn if we're emitting a weak vtable. 10793 if (Class->getLinkage() == ExternalLinkage && 10794 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10795 const FunctionDecl *KeyFunctionDef = 0; 10796 if (!KeyFunction || 10797 (KeyFunction->hasBody(KeyFunctionDef) && 10798 KeyFunctionDef->isInlined())) 10799 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10800 TSK_ExplicitInstantiationDefinition 10801 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10802 << Class; 10803 } 10804 } 10805 VTableUses.clear(); 10806 10807 return DefinedAnything; 10808} 10809 10810void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10811 const CXXRecordDecl *RD) { 10812 // Mark all functions which will appear in RD's vtable as used. 10813 CXXFinalOverriderMap FinalOverriders; 10814 RD->getFinalOverriders(FinalOverriders); 10815 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 10816 E = FinalOverriders.end(); 10817 I != E; ++I) { 10818 for (OverridingMethods::const_iterator OI = I->second.begin(), 10819 OE = I->second.end(); 10820 OI != OE; ++OI) { 10821 assert(OI->second.size() > 0 && "no final overrider"); 10822 CXXMethodDecl *Overrider = OI->second.front().Method; 10823 10824 // C++ [basic.def.odr]p2: 10825 // [...] A virtual member function is used if it is not pure. [...] 10826 if (!Overrider->isPure()) 10827 MarkFunctionReferenced(Loc, Overrider); 10828 } 10829 } 10830 10831 // Only classes that have virtual bases need a VTT. 10832 if (RD->getNumVBases() == 0) 10833 return; 10834 10835 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10836 e = RD->bases_end(); i != e; ++i) { 10837 const CXXRecordDecl *Base = 10838 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10839 if (Base->getNumVBases() == 0) 10840 continue; 10841 MarkVirtualMembersReferenced(Loc, Base); 10842 } 10843} 10844 10845/// SetIvarInitializers - This routine builds initialization ASTs for the 10846/// Objective-C implementation whose ivars need be initialized. 10847void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10848 if (!getLangOpts().CPlusPlus) 10849 return; 10850 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10851 SmallVector<ObjCIvarDecl*, 8> ivars; 10852 CollectIvarsToConstructOrDestruct(OID, ivars); 10853 if (ivars.empty()) 10854 return; 10855 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10856 for (unsigned i = 0; i < ivars.size(); i++) { 10857 FieldDecl *Field = ivars[i]; 10858 if (Field->isInvalidDecl()) 10859 continue; 10860 10861 CXXCtorInitializer *Member; 10862 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10863 InitializationKind InitKind = 10864 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10865 10866 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10867 ExprResult MemberInit = 10868 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10869 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10870 // Note, MemberInit could actually come back empty if no initialization 10871 // is required (e.g., because it would call a trivial default constructor) 10872 if (!MemberInit.get() || MemberInit.isInvalid()) 10873 continue; 10874 10875 Member = 10876 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10877 SourceLocation(), 10878 MemberInit.takeAs<Expr>(), 10879 SourceLocation()); 10880 AllToInit.push_back(Member); 10881 10882 // Be sure that the destructor is accessible and is marked as referenced. 10883 if (const RecordType *RecordTy 10884 = Context.getBaseElementType(Field->getType()) 10885 ->getAs<RecordType>()) { 10886 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10887 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10888 MarkFunctionReferenced(Field->getLocation(), Destructor); 10889 CheckDestructorAccess(Field->getLocation(), Destructor, 10890 PDiag(diag::err_access_dtor_ivar) 10891 << Context.getBaseElementType(Field->getType())); 10892 } 10893 } 10894 } 10895 ObjCImplementation->setIvarInitializers(Context, 10896 AllToInit.data(), AllToInit.size()); 10897 } 10898} 10899 10900static 10901void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10902 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10903 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10904 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10905 Sema &S) { 10906 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10907 CE = Current.end(); 10908 if (Ctor->isInvalidDecl()) 10909 return; 10910 10911 const FunctionDecl *FNTarget = 0; 10912 CXXConstructorDecl *Target; 10913 10914 // We ignore the result here since if we don't have a body, Target will be 10915 // null below. 10916 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10917 Target 10918= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10919 10920 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10921 // Avoid dereferencing a null pointer here. 10922 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10923 10924 if (!Current.insert(Canonical)) 10925 return; 10926 10927 // We know that beyond here, we aren't chaining into a cycle. 10928 if (!Target || !Target->isDelegatingConstructor() || 10929 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10930 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10931 Valid.insert(*CI); 10932 Current.clear(); 10933 // We've hit a cycle. 10934 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10935 Current.count(TCanonical)) { 10936 // If we haven't diagnosed this cycle yet, do so now. 10937 if (!Invalid.count(TCanonical)) { 10938 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10939 diag::warn_delegating_ctor_cycle) 10940 << Ctor; 10941 10942 // Don't add a note for a function delegating directo to itself. 10943 if (TCanonical != Canonical) 10944 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10945 10946 CXXConstructorDecl *C = Target; 10947 while (C->getCanonicalDecl() != Canonical) { 10948 (void)C->getTargetConstructor()->hasBody(FNTarget); 10949 assert(FNTarget && "Ctor cycle through bodiless function"); 10950 10951 C 10952 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10953 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10954 } 10955 } 10956 10957 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10958 Invalid.insert(*CI); 10959 Current.clear(); 10960 } else { 10961 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10962 } 10963} 10964 10965 10966void Sema::CheckDelegatingCtorCycles() { 10967 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10968 10969 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10970 CE = Current.end(); 10971 10972 for (DelegatingCtorDeclsType::iterator 10973 I = DelegatingCtorDecls.begin(ExternalSource), 10974 E = DelegatingCtorDecls.end(); 10975 I != E; ++I) { 10976 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10977 } 10978 10979 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10980 (*CI)->setInvalidDecl(); 10981} 10982 10983namespace { 10984 /// \brief AST visitor that finds references to the 'this' expression. 10985 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 10986 Sema &S; 10987 10988 public: 10989 explicit FindCXXThisExpr(Sema &S) : S(S) { } 10990 10991 bool VisitCXXThisExpr(CXXThisExpr *E) { 10992 S.Diag(E->getLocation(), diag::err_this_static_member_func) 10993 << E->isImplicit(); 10994 return false; 10995 } 10996 }; 10997} 10998 10999bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 11000 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11001 if (!TSInfo) 11002 return false; 11003 11004 TypeLoc TL = TSInfo->getTypeLoc(); 11005 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11006 if (!ProtoTL) 11007 return false; 11008 11009 // C++11 [expr.prim.general]p3: 11010 // [The expression this] shall not appear before the optional 11011 // cv-qualifier-seq and it shall not appear within the declaration of a 11012 // static member function (although its type and value category are defined 11013 // within a static member function as they are within a non-static member 11014 // function). [ Note: this is because declaration matching does not occur 11015 // until the complete declarator is known. - end note ] 11016 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11017 FindCXXThisExpr Finder(*this); 11018 11019 // If the return type came after the cv-qualifier-seq, check it now. 11020 if (Proto->hasTrailingReturn() && 11021 !Finder.TraverseTypeLoc(ProtoTL->getResultLoc())) 11022 return true; 11023 11024 // Check the exception specification. 11025 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 11026 return true; 11027 11028 return checkThisInStaticMemberFunctionAttributes(Method); 11029} 11030 11031bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 11032 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11033 if (!TSInfo) 11034 return false; 11035 11036 TypeLoc TL = TSInfo->getTypeLoc(); 11037 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11038 if (!ProtoTL) 11039 return false; 11040 11041 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11042 FindCXXThisExpr Finder(*this); 11043 11044 switch (Proto->getExceptionSpecType()) { 11045 case EST_Uninstantiated: 11046 case EST_BasicNoexcept: 11047 case EST_Delayed: 11048 case EST_DynamicNone: 11049 case EST_MSAny: 11050 case EST_None: 11051 break; 11052 11053 case EST_ComputedNoexcept: 11054 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11055 return true; 11056 11057 case EST_Dynamic: 11058 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11059 EEnd = Proto->exception_end(); 11060 E != EEnd; ++E) { 11061 if (!Finder.TraverseType(*E)) 11062 return true; 11063 } 11064 break; 11065 } 11066 11067 return false; 11068} 11069 11070bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11071 FindCXXThisExpr Finder(*this); 11072 11073 // Check attributes. 11074 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11075 A != AEnd; ++A) { 11076 // FIXME: This should be emitted by tblgen. 11077 Expr *Arg = 0; 11078 ArrayRef<Expr *> Args; 11079 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11080 Arg = G->getArg(); 11081 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11082 Arg = G->getArg(); 11083 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11084 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11085 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11086 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11087 else if (ExclusiveLockFunctionAttr *ELF 11088 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11089 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11090 else if (SharedLockFunctionAttr *SLF 11091 = dyn_cast<SharedLockFunctionAttr>(*A)) 11092 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11093 else if (ExclusiveTrylockFunctionAttr *ETLF 11094 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11095 Arg = ETLF->getSuccessValue(); 11096 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11097 } else if (SharedTrylockFunctionAttr *STLF 11098 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11099 Arg = STLF->getSuccessValue(); 11100 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11101 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11102 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11103 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11104 Arg = LR->getArg(); 11105 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11106 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11107 else if (ExclusiveLocksRequiredAttr *ELR 11108 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11109 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11110 else if (SharedLocksRequiredAttr *SLR 11111 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11112 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11113 11114 if (Arg && !Finder.TraverseStmt(Arg)) 11115 return true; 11116 11117 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11118 if (!Finder.TraverseStmt(Args[I])) 11119 return true; 11120 } 11121 } 11122 11123 return false; 11124} 11125 11126void 11127Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 11128 ArrayRef<ParsedType> DynamicExceptions, 11129 ArrayRef<SourceRange> DynamicExceptionRanges, 11130 Expr *NoexceptExpr, 11131 llvm::SmallVectorImpl<QualType> &Exceptions, 11132 FunctionProtoType::ExtProtoInfo &EPI) { 11133 Exceptions.clear(); 11134 EPI.ExceptionSpecType = EST; 11135 if (EST == EST_Dynamic) { 11136 Exceptions.reserve(DynamicExceptions.size()); 11137 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 11138 // FIXME: Preserve type source info. 11139 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 11140 11141 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 11142 collectUnexpandedParameterPacks(ET, Unexpanded); 11143 if (!Unexpanded.empty()) { 11144 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 11145 UPPC_ExceptionType, 11146 Unexpanded); 11147 continue; 11148 } 11149 11150 // Check that the type is valid for an exception spec, and 11151 // drop it if not. 11152 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 11153 Exceptions.push_back(ET); 11154 } 11155 EPI.NumExceptions = Exceptions.size(); 11156 EPI.Exceptions = Exceptions.data(); 11157 return; 11158 } 11159 11160 if (EST == EST_ComputedNoexcept) { 11161 // If an error occurred, there's no expression here. 11162 if (NoexceptExpr) { 11163 assert((NoexceptExpr->isTypeDependent() || 11164 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 11165 Context.BoolTy) && 11166 "Parser should have made sure that the expression is boolean"); 11167 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 11168 EPI.ExceptionSpecType = EST_BasicNoexcept; 11169 return; 11170 } 11171 11172 if (!NoexceptExpr->isValueDependent()) 11173 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 11174 diag::err_noexcept_needs_constant_expression, 11175 /*AllowFold*/ false).take(); 11176 EPI.NoexceptExpr = NoexceptExpr; 11177 } 11178 return; 11179 } 11180} 11181 11182/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11183Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11184 // Implicitly declared functions (e.g. copy constructors) are 11185 // __host__ __device__ 11186 if (D->isImplicit()) 11187 return CFT_HostDevice; 11188 11189 if (D->hasAttr<CUDAGlobalAttr>()) 11190 return CFT_Global; 11191 11192 if (D->hasAttr<CUDADeviceAttr>()) { 11193 if (D->hasAttr<CUDAHostAttr>()) 11194 return CFT_HostDevice; 11195 else 11196 return CFT_Device; 11197 } 11198 11199 return CFT_Host; 11200} 11201 11202bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11203 CUDAFunctionTarget CalleeTarget) { 11204 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11205 // Callable from the device only." 11206 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11207 return true; 11208 11209 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11210 // Callable from the host only." 11211 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11212 // Callable from the host only." 11213 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11214 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11215 return true; 11216 11217 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11218 return true; 11219 11220 return false; 11221} 11222