SemaDeclCXX.cpp revision f6513edbb783bb465987033934a68af5c1ded25b
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 "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/RecordLayout.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/TypeLoc.h" 23#include "clang/AST/TypeOrdering.h" 24#include "clang/AST/StmtVisitor.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Parse/Template.h" 27#include "clang/Basic/PartialDiagnostic.h" 28#include "clang/Lex/Preprocessor.h" 29#include "llvm/ADT/STLExtras.h" 30#include <map> 31#include <set> 32 33using namespace clang; 34 35//===----------------------------------------------------------------------===// 36// CheckDefaultArgumentVisitor 37//===----------------------------------------------------------------------===// 38 39namespace { 40 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 41 /// the default argument of a parameter to determine whether it 42 /// contains any ill-formed subexpressions. For example, this will 43 /// diagnose the use of local variables or parameters within the 44 /// default argument expression. 45 class CheckDefaultArgumentVisitor 46 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 47 Expr *DefaultArg; 48 Sema *S; 49 50 public: 51 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 52 : DefaultArg(defarg), S(s) {} 53 54 bool VisitExpr(Expr *Node); 55 bool VisitDeclRefExpr(DeclRefExpr *DRE); 56 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 57 }; 58 59 /// VisitExpr - Visit all of the children of this expression. 60 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 61 bool IsInvalid = false; 62 for (Stmt::child_iterator I = Node->child_begin(), 63 E = Node->child_end(); I != E; ++I) 64 IsInvalid |= Visit(*I); 65 return IsInvalid; 66 } 67 68 /// VisitDeclRefExpr - Visit a reference to a declaration, to 69 /// determine whether this declaration can be used in the default 70 /// argument expression. 71 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 72 NamedDecl *Decl = DRE->getDecl(); 73 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 74 // C++ [dcl.fct.default]p9 75 // Default arguments are evaluated each time the function is 76 // called. The order of evaluation of function arguments is 77 // unspecified. Consequently, parameters of a function shall not 78 // be used in default argument expressions, even if they are not 79 // evaluated. Parameters of a function declared before a default 80 // argument expression are in scope and can hide namespace and 81 // class member names. 82 return S->Diag(DRE->getSourceRange().getBegin(), 83 diag::err_param_default_argument_references_param) 84 << Param->getDeclName() << DefaultArg->getSourceRange(); 85 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 86 // C++ [dcl.fct.default]p7 87 // Local variables shall not be used in default argument 88 // expressions. 89 if (VDecl->isBlockVarDecl()) 90 return S->Diag(DRE->getSourceRange().getBegin(), 91 diag::err_param_default_argument_references_local) 92 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 93 } 94 95 return false; 96 } 97 98 /// VisitCXXThisExpr - Visit a C++ "this" expression. 99 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 100 // C++ [dcl.fct.default]p8: 101 // The keyword this shall not be used in a default argument of a 102 // member function. 103 return S->Diag(ThisE->getSourceRange().getBegin(), 104 diag::err_param_default_argument_references_this) 105 << ThisE->getSourceRange(); 106 } 107} 108 109bool 110Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 111 SourceLocation EqualLoc) { 112 if (RequireCompleteType(Param->getLocation(), Param->getType(), 113 diag::err_typecheck_decl_incomplete_type)) { 114 Param->setInvalidDecl(); 115 return true; 116 } 117 118 Expr *Arg = (Expr *)DefaultArg.get(); 119 120 // C++ [dcl.fct.default]p5 121 // A default argument expression is implicitly converted (clause 122 // 4) to the parameter type. The default argument expression has 123 // the same semantic constraints as the initializer expression in 124 // a declaration of a variable of the parameter type, using the 125 // copy-initialization semantics (8.5). 126 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 127 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 128 EqualLoc); 129 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 130 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 131 MultiExprArg(*this, (void**)&Arg, 1)); 132 if (Result.isInvalid()) 133 return true; 134 Arg = Result.takeAs<Expr>(); 135 136 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 137 138 // Okay: add the default argument to the parameter 139 Param->setDefaultArg(Arg); 140 141 DefaultArg.release(); 142 143 return false; 144} 145 146/// ActOnParamDefaultArgument - Check whether the default argument 147/// provided for a function parameter is well-formed. If so, attach it 148/// to the parameter declaration. 149void 150Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 151 ExprArg defarg) { 152 if (!param || !defarg.get()) 153 return; 154 155 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 156 UnparsedDefaultArgLocs.erase(Param); 157 158 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 159 160 // Default arguments are only permitted in C++ 161 if (!getLangOptions().CPlusPlus) { 162 Diag(EqualLoc, diag::err_param_default_argument) 163 << DefaultArg->getSourceRange(); 164 Param->setInvalidDecl(); 165 return; 166 } 167 168 // Check that the default argument is well-formed 169 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 170 if (DefaultArgChecker.Visit(DefaultArg.get())) { 171 Param->setInvalidDecl(); 172 return; 173 } 174 175 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 176} 177 178/// ActOnParamUnparsedDefaultArgument - We've seen a default 179/// argument for a function parameter, but we can't parse it yet 180/// because we're inside a class definition. Note that this default 181/// argument will be parsed later. 182void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 183 SourceLocation EqualLoc, 184 SourceLocation ArgLoc) { 185 if (!param) 186 return; 187 188 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 189 if (Param) 190 Param->setUnparsedDefaultArg(); 191 192 UnparsedDefaultArgLocs[Param] = ArgLoc; 193} 194 195/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 196/// the default argument for the parameter param failed. 197void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 198 if (!param) 199 return; 200 201 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 202 203 Param->setInvalidDecl(); 204 205 UnparsedDefaultArgLocs.erase(Param); 206} 207 208/// CheckExtraCXXDefaultArguments - Check for any extra default 209/// arguments in the declarator, which is not a function declaration 210/// or definition and therefore is not permitted to have default 211/// arguments. This routine should be invoked for every declarator 212/// that is not a function declaration or definition. 213void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 214 // C++ [dcl.fct.default]p3 215 // A default argument expression shall be specified only in the 216 // parameter-declaration-clause of a function declaration or in a 217 // template-parameter (14.1). It shall not be specified for a 218 // parameter pack. If it is specified in a 219 // parameter-declaration-clause, it shall not occur within a 220 // declarator or abstract-declarator of a parameter-declaration. 221 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 222 DeclaratorChunk &chunk = D.getTypeObject(i); 223 if (chunk.Kind == DeclaratorChunk::Function) { 224 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 225 ParmVarDecl *Param = 226 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 227 if (Param->hasUnparsedDefaultArg()) { 228 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 229 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 230 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 231 delete Toks; 232 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 233 } else if (Param->getDefaultArg()) { 234 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 235 << Param->getDefaultArg()->getSourceRange(); 236 Param->setDefaultArg(0); 237 } 238 } 239 } 240 } 241} 242 243// MergeCXXFunctionDecl - Merge two declarations of the same C++ 244// function, once we already know that they have the same 245// type. Subroutine of MergeFunctionDecl. Returns true if there was an 246// error, false otherwise. 247bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 248 bool Invalid = false; 249 250 // C++ [dcl.fct.default]p4: 251 // For non-template functions, default arguments can be added in 252 // later declarations of a function in the same 253 // scope. Declarations in different scopes have completely 254 // distinct sets of default arguments. That is, declarations in 255 // inner scopes do not acquire default arguments from 256 // declarations in outer scopes, and vice versa. In a given 257 // function declaration, all parameters subsequent to a 258 // parameter with a default argument shall have default 259 // arguments supplied in this or previous declarations. A 260 // default argument shall not be redefined by a later 261 // declaration (not even to the same value). 262 // 263 // C++ [dcl.fct.default]p6: 264 // Except for member functions of class templates, the default arguments 265 // in a member function definition that appears outside of the class 266 // definition are added to the set of default arguments provided by the 267 // member function declaration in the class definition. 268 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 269 ParmVarDecl *OldParam = Old->getParamDecl(p); 270 ParmVarDecl *NewParam = New->getParamDecl(p); 271 272 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 273 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 274 // hint here. Alternatively, we could walk the type-source information 275 // for NewParam to find the last source location in the type... but it 276 // isn't worth the effort right now. This is the kind of test case that 277 // is hard to get right: 278 279 // int f(int); 280 // void g(int (*fp)(int) = f); 281 // void g(int (*fp)(int) = &f); 282 Diag(NewParam->getLocation(), 283 diag::err_param_default_argument_redefinition) 284 << NewParam->getDefaultArgRange(); 285 286 // Look for the function declaration where the default argument was 287 // actually written, which may be a declaration prior to Old. 288 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 289 Older; Older = Older->getPreviousDeclaration()) { 290 if (!Older->getParamDecl(p)->hasDefaultArg()) 291 break; 292 293 OldParam = Older->getParamDecl(p); 294 } 295 296 Diag(OldParam->getLocation(), diag::note_previous_definition) 297 << OldParam->getDefaultArgRange(); 298 Invalid = true; 299 } else if (OldParam->hasDefaultArg()) { 300 // Merge the old default argument into the new parameter 301 NewParam->setHasInheritedDefaultArg(); 302 if (OldParam->hasUninstantiatedDefaultArg()) 303 NewParam->setUninstantiatedDefaultArg( 304 OldParam->getUninstantiatedDefaultArg()); 305 else 306 NewParam->setDefaultArg(OldParam->getDefaultArg()); 307 } else if (NewParam->hasDefaultArg()) { 308 if (New->getDescribedFunctionTemplate()) { 309 // Paragraph 4, quoted above, only applies to non-template functions. 310 Diag(NewParam->getLocation(), 311 diag::err_param_default_argument_template_redecl) 312 << NewParam->getDefaultArgRange(); 313 Diag(Old->getLocation(), diag::note_template_prev_declaration) 314 << false; 315 } else if (New->getTemplateSpecializationKind() 316 != TSK_ImplicitInstantiation && 317 New->getTemplateSpecializationKind() != TSK_Undeclared) { 318 // C++ [temp.expr.spec]p21: 319 // Default function arguments shall not be specified in a declaration 320 // or a definition for one of the following explicit specializations: 321 // - the explicit specialization of a function template; 322 // - the explicit specialization of a member function template; 323 // - the explicit specialization of a member function of a class 324 // template where the class template specialization to which the 325 // member function specialization belongs is implicitly 326 // instantiated. 327 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 328 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 329 << New->getDeclName() 330 << NewParam->getDefaultArgRange(); 331 } else if (New->getDeclContext()->isDependentContext()) { 332 // C++ [dcl.fct.default]p6 (DR217): 333 // Default arguments for a member function of a class template shall 334 // be specified on the initial declaration of the member function 335 // within the class template. 336 // 337 // Reading the tea leaves a bit in DR217 and its reference to DR205 338 // leads me to the conclusion that one cannot add default function 339 // arguments for an out-of-line definition of a member function of a 340 // dependent type. 341 int WhichKind = 2; 342 if (CXXRecordDecl *Record 343 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 344 if (Record->getDescribedClassTemplate()) 345 WhichKind = 0; 346 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 347 WhichKind = 1; 348 else 349 WhichKind = 2; 350 } 351 352 Diag(NewParam->getLocation(), 353 diag::err_param_default_argument_member_template_redecl) 354 << WhichKind 355 << NewParam->getDefaultArgRange(); 356 } 357 } 358 } 359 360 if (CheckEquivalentExceptionSpec(Old, New)) 361 Invalid = true; 362 363 return Invalid; 364} 365 366/// CheckCXXDefaultArguments - Verify that the default arguments for a 367/// function declaration are well-formed according to C++ 368/// [dcl.fct.default]. 369void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 370 unsigned NumParams = FD->getNumParams(); 371 unsigned p; 372 373 // Find first parameter with a default argument 374 for (p = 0; p < NumParams; ++p) { 375 ParmVarDecl *Param = FD->getParamDecl(p); 376 if (Param->hasDefaultArg()) 377 break; 378 } 379 380 // C++ [dcl.fct.default]p4: 381 // In a given function declaration, all parameters 382 // subsequent to a parameter with a default argument shall 383 // have default arguments supplied in this or previous 384 // declarations. A default argument shall not be redefined 385 // by a later declaration (not even to the same value). 386 unsigned LastMissingDefaultArg = 0; 387 for (; p < NumParams; ++p) { 388 ParmVarDecl *Param = FD->getParamDecl(p); 389 if (!Param->hasDefaultArg()) { 390 if (Param->isInvalidDecl()) 391 /* We already complained about this parameter. */; 392 else if (Param->getIdentifier()) 393 Diag(Param->getLocation(), 394 diag::err_param_default_argument_missing_name) 395 << Param->getIdentifier(); 396 else 397 Diag(Param->getLocation(), 398 diag::err_param_default_argument_missing); 399 400 LastMissingDefaultArg = p; 401 } 402 } 403 404 if (LastMissingDefaultArg > 0) { 405 // Some default arguments were missing. Clear out all of the 406 // default arguments up to (and including) the last missing 407 // default argument, so that we leave the function parameters 408 // in a semantically valid state. 409 for (p = 0; p <= LastMissingDefaultArg; ++p) { 410 ParmVarDecl *Param = FD->getParamDecl(p); 411 if (Param->hasDefaultArg()) { 412 if (!Param->hasUnparsedDefaultArg()) 413 Param->getDefaultArg()->Destroy(Context); 414 Param->setDefaultArg(0); 415 } 416 } 417 } 418} 419 420/// isCurrentClassName - Determine whether the identifier II is the 421/// name of the class type currently being defined. In the case of 422/// nested classes, this will only return true if II is the name of 423/// the innermost class. 424bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 425 const CXXScopeSpec *SS) { 426 assert(getLangOptions().CPlusPlus && "No class names in C!"); 427 428 CXXRecordDecl *CurDecl; 429 if (SS && SS->isSet() && !SS->isInvalid()) { 430 DeclContext *DC = computeDeclContext(*SS, true); 431 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 432 } else 433 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 434 435 if (CurDecl && CurDecl->getIdentifier()) 436 return &II == CurDecl->getIdentifier(); 437 else 438 return false; 439} 440 441/// \brief Check the validity of a C++ base class specifier. 442/// 443/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 444/// and returns NULL otherwise. 445CXXBaseSpecifier * 446Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 447 SourceRange SpecifierRange, 448 bool Virtual, AccessSpecifier Access, 449 QualType BaseType, 450 SourceLocation BaseLoc) { 451 // C++ [class.union]p1: 452 // A union shall not have base classes. 453 if (Class->isUnion()) { 454 Diag(Class->getLocation(), diag::err_base_clause_on_union) 455 << SpecifierRange; 456 return 0; 457 } 458 459 if (BaseType->isDependentType()) 460 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 461 Class->getTagKind() == RecordDecl::TK_class, 462 Access, BaseType); 463 464 // Base specifiers must be record types. 465 if (!BaseType->isRecordType()) { 466 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 467 return 0; 468 } 469 470 // C++ [class.union]p1: 471 // A union shall not be used as a base class. 472 if (BaseType->isUnionType()) { 473 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 474 return 0; 475 } 476 477 // C++ [class.derived]p2: 478 // The class-name in a base-specifier shall not be an incompletely 479 // defined class. 480 if (RequireCompleteType(BaseLoc, BaseType, 481 PDiag(diag::err_incomplete_base_class) 482 << SpecifierRange)) 483 return 0; 484 485 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 486 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 487 assert(BaseDecl && "Record type has no declaration"); 488 BaseDecl = BaseDecl->getDefinition(); 489 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 490 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 491 assert(CXXBaseDecl && "Base type is not a C++ type"); 492 493 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 494 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 495 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 496 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 497 << BaseType; 498 return 0; 499 } 500 501 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 502 503 // Create the base specifier. 504 // FIXME: Allocate via ASTContext? 505 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 506 Class->getTagKind() == RecordDecl::TK_class, 507 Access, BaseType); 508} 509 510void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 511 const CXXRecordDecl *BaseClass, 512 bool BaseIsVirtual) { 513 // A class with a non-empty base class is not empty. 514 // FIXME: Standard ref? 515 if (!BaseClass->isEmpty()) 516 Class->setEmpty(false); 517 518 // C++ [class.virtual]p1: 519 // A class that [...] inherits a virtual function is called a polymorphic 520 // class. 521 if (BaseClass->isPolymorphic()) 522 Class->setPolymorphic(true); 523 524 // C++ [dcl.init.aggr]p1: 525 // An aggregate is [...] a class with [...] no base classes [...]. 526 Class->setAggregate(false); 527 528 // C++ [class]p4: 529 // A POD-struct is an aggregate class... 530 Class->setPOD(false); 531 532 if (BaseIsVirtual) { 533 // C++ [class.ctor]p5: 534 // A constructor is trivial if its class has no virtual base classes. 535 Class->setHasTrivialConstructor(false); 536 537 // C++ [class.copy]p6: 538 // A copy constructor is trivial if its class has no virtual base classes. 539 Class->setHasTrivialCopyConstructor(false); 540 541 // C++ [class.copy]p11: 542 // A copy assignment operator is trivial if its class has no virtual 543 // base classes. 544 Class->setHasTrivialCopyAssignment(false); 545 546 // C++0x [meta.unary.prop] is_empty: 547 // T is a class type, but not a union type, with ... no virtual base 548 // classes 549 Class->setEmpty(false); 550 } else { 551 // C++ [class.ctor]p5: 552 // A constructor is trivial if all the direct base classes of its 553 // class have trivial constructors. 554 if (!BaseClass->hasTrivialConstructor()) 555 Class->setHasTrivialConstructor(false); 556 557 // C++ [class.copy]p6: 558 // A copy constructor is trivial if all the direct base classes of its 559 // class have trivial copy constructors. 560 if (!BaseClass->hasTrivialCopyConstructor()) 561 Class->setHasTrivialCopyConstructor(false); 562 563 // C++ [class.copy]p11: 564 // A copy assignment operator is trivial if all the direct base classes 565 // of its class have trivial copy assignment operators. 566 if (!BaseClass->hasTrivialCopyAssignment()) 567 Class->setHasTrivialCopyAssignment(false); 568 } 569 570 // C++ [class.ctor]p3: 571 // A destructor is trivial if all the direct base classes of its class 572 // have trivial destructors. 573 if (!BaseClass->hasTrivialDestructor()) 574 Class->setHasTrivialDestructor(false); 575} 576 577/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 578/// one entry in the base class list of a class specifier, for 579/// example: 580/// class foo : public bar, virtual private baz { 581/// 'public bar' and 'virtual private baz' are each base-specifiers. 582Sema::BaseResult 583Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 584 bool Virtual, AccessSpecifier Access, 585 TypeTy *basetype, SourceLocation BaseLoc) { 586 if (!classdecl) 587 return true; 588 589 AdjustDeclIfTemplate(classdecl); 590 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 591 if (!Class) 592 return true; 593 594 QualType BaseType = GetTypeFromParser(basetype); 595 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 596 Virtual, Access, 597 BaseType, BaseLoc)) 598 return BaseSpec; 599 600 return true; 601} 602 603/// \brief Performs the actual work of attaching the given base class 604/// specifiers to a C++ class. 605bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 606 unsigned NumBases) { 607 if (NumBases == 0) 608 return false; 609 610 // Used to keep track of which base types we have already seen, so 611 // that we can properly diagnose redundant direct base types. Note 612 // that the key is always the unqualified canonical type of the base 613 // class. 614 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 615 616 // Copy non-redundant base specifiers into permanent storage. 617 unsigned NumGoodBases = 0; 618 bool Invalid = false; 619 for (unsigned idx = 0; idx < NumBases; ++idx) { 620 QualType NewBaseType 621 = Context.getCanonicalType(Bases[idx]->getType()); 622 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 623 624 if (KnownBaseTypes[NewBaseType]) { 625 // C++ [class.mi]p3: 626 // A class shall not be specified as a direct base class of a 627 // derived class more than once. 628 Diag(Bases[idx]->getSourceRange().getBegin(), 629 diag::err_duplicate_base_class) 630 << KnownBaseTypes[NewBaseType]->getType() 631 << Bases[idx]->getSourceRange(); 632 633 // Delete the duplicate base class specifier; we're going to 634 // overwrite its pointer later. 635 Context.Deallocate(Bases[idx]); 636 637 Invalid = true; 638 } else { 639 // Okay, add this new base class. 640 KnownBaseTypes[NewBaseType] = Bases[idx]; 641 Bases[NumGoodBases++] = Bases[idx]; 642 } 643 } 644 645 // Attach the remaining base class specifiers to the derived class. 646 Class->setBases(Bases, NumGoodBases); 647 648 // Delete the remaining (good) base class specifiers, since their 649 // data has been copied into the CXXRecordDecl. 650 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 651 Context.Deallocate(Bases[idx]); 652 653 return Invalid; 654} 655 656/// ActOnBaseSpecifiers - Attach the given base specifiers to the 657/// class, after checking whether there are any duplicate base 658/// classes. 659void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 660 unsigned NumBases) { 661 if (!ClassDecl || !Bases || !NumBases) 662 return; 663 664 AdjustDeclIfTemplate(ClassDecl); 665 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 666 (CXXBaseSpecifier**)(Bases), NumBases); 667} 668 669static CXXRecordDecl *GetClassForType(QualType T) { 670 if (const RecordType *RT = T->getAs<RecordType>()) 671 return cast<CXXRecordDecl>(RT->getDecl()); 672 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 673 return ICT->getDecl(); 674 else 675 return 0; 676} 677 678/// \brief Determine whether the type \p Derived is a C++ class that is 679/// derived from the type \p Base. 680bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 681 if (!getLangOptions().CPlusPlus) 682 return false; 683 684 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 685 if (!DerivedRD) 686 return false; 687 688 CXXRecordDecl *BaseRD = GetClassForType(Base); 689 if (!BaseRD) 690 return false; 691 692 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 693 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 694} 695 696/// \brief Determine whether the type \p Derived is a C++ class that is 697/// derived from the type \p Base. 698bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 699 if (!getLangOptions().CPlusPlus) 700 return false; 701 702 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 703 if (!DerivedRD) 704 return false; 705 706 CXXRecordDecl *BaseRD = GetClassForType(Base); 707 if (!BaseRD) 708 return false; 709 710 return DerivedRD->isDerivedFrom(BaseRD, Paths); 711} 712 713/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 714/// conversion (where Derived and Base are class types) is 715/// well-formed, meaning that the conversion is unambiguous (and 716/// that all of the base classes are accessible). Returns true 717/// and emits a diagnostic if the code is ill-formed, returns false 718/// otherwise. Loc is the location where this routine should point to 719/// if there is an error, and Range is the source range to highlight 720/// if there is an error. 721bool 722Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 723 unsigned InaccessibleBaseID, 724 unsigned AmbigiousBaseConvID, 725 SourceLocation Loc, SourceRange Range, 726 DeclarationName Name) { 727 // First, determine whether the path from Derived to Base is 728 // ambiguous. This is slightly more expensive than checking whether 729 // the Derived to Base conversion exists, because here we need to 730 // explore multiple paths to determine if there is an ambiguity. 731 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 732 /*DetectVirtual=*/false); 733 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 734 assert(DerivationOkay && 735 "Can only be used with a derived-to-base conversion"); 736 (void)DerivationOkay; 737 738 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 739 if (!InaccessibleBaseID) 740 return false; 741 742 // Check that the base class can be accessed. 743 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 744 InaccessibleBaseID)) { 745 case AR_accessible: return false; 746 case AR_inaccessible: return true; 747 case AR_dependent: return false; 748 case AR_delayed: return false; 749 } 750 } 751 752 // We know that the derived-to-base conversion is ambiguous, and 753 // we're going to produce a diagnostic. Perform the derived-to-base 754 // search just one more time to compute all of the possible paths so 755 // that we can print them out. This is more expensive than any of 756 // the previous derived-to-base checks we've done, but at this point 757 // performance isn't as much of an issue. 758 Paths.clear(); 759 Paths.setRecordingPaths(true); 760 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 761 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 762 (void)StillOkay; 763 764 // Build up a textual representation of the ambiguous paths, e.g., 765 // D -> B -> A, that will be used to illustrate the ambiguous 766 // conversions in the diagnostic. We only print one of the paths 767 // to each base class subobject. 768 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 769 770 Diag(Loc, AmbigiousBaseConvID) 771 << Derived << Base << PathDisplayStr << Range << Name; 772 return true; 773} 774 775bool 776Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 777 SourceLocation Loc, SourceRange Range, 778 bool IgnoreAccess) { 779 return CheckDerivedToBaseConversion(Derived, Base, 780 IgnoreAccess ? 0 781 : diag::err_upcast_to_inaccessible_base, 782 diag::err_ambiguous_derived_to_base_conv, 783 Loc, Range, DeclarationName()); 784} 785 786 787/// @brief Builds a string representing ambiguous paths from a 788/// specific derived class to different subobjects of the same base 789/// class. 790/// 791/// This function builds a string that can be used in error messages 792/// to show the different paths that one can take through the 793/// inheritance hierarchy to go from the derived class to different 794/// subobjects of a base class. The result looks something like this: 795/// @code 796/// struct D -> struct B -> struct A 797/// struct D -> struct C -> struct A 798/// @endcode 799std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 800 std::string PathDisplayStr; 801 std::set<unsigned> DisplayedPaths; 802 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 803 Path != Paths.end(); ++Path) { 804 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 805 // We haven't displayed a path to this particular base 806 // class subobject yet. 807 PathDisplayStr += "\n "; 808 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 809 for (CXXBasePath::const_iterator Element = Path->begin(); 810 Element != Path->end(); ++Element) 811 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 812 } 813 } 814 815 return PathDisplayStr; 816} 817 818//===----------------------------------------------------------------------===// 819// C++ class member Handling 820//===----------------------------------------------------------------------===// 821 822/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 823/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 824/// bitfield width if there is one and 'InitExpr' specifies the initializer if 825/// any. 826Sema::DeclPtrTy 827Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 828 MultiTemplateParamsArg TemplateParameterLists, 829 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 830 bool Deleted) { 831 const DeclSpec &DS = D.getDeclSpec(); 832 DeclarationName Name = GetNameForDeclarator(D); 833 Expr *BitWidth = static_cast<Expr*>(BW); 834 Expr *Init = static_cast<Expr*>(InitExpr); 835 SourceLocation Loc = D.getIdentifierLoc(); 836 837 bool isFunc = D.isFunctionDeclarator(); 838 839 assert(!DS.isFriendSpecified()); 840 841 // C++ 9.2p6: A member shall not be declared to have automatic storage 842 // duration (auto, register) or with the extern storage-class-specifier. 843 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 844 // data members and cannot be applied to names declared const or static, 845 // and cannot be applied to reference members. 846 switch (DS.getStorageClassSpec()) { 847 case DeclSpec::SCS_unspecified: 848 case DeclSpec::SCS_typedef: 849 case DeclSpec::SCS_static: 850 // FALL THROUGH. 851 break; 852 case DeclSpec::SCS_mutable: 853 if (isFunc) { 854 if (DS.getStorageClassSpecLoc().isValid()) 855 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 856 else 857 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 858 859 // FIXME: It would be nicer if the keyword was ignored only for this 860 // declarator. Otherwise we could get follow-up errors. 861 D.getMutableDeclSpec().ClearStorageClassSpecs(); 862 } else { 863 QualType T = GetTypeForDeclarator(D, S); 864 diag::kind err = static_cast<diag::kind>(0); 865 if (T->isReferenceType()) 866 err = diag::err_mutable_reference; 867 else if (T.isConstQualified()) 868 err = diag::err_mutable_const; 869 if (err != 0) { 870 if (DS.getStorageClassSpecLoc().isValid()) 871 Diag(DS.getStorageClassSpecLoc(), err); 872 else 873 Diag(DS.getThreadSpecLoc(), err); 874 // FIXME: It would be nicer if the keyword was ignored only for this 875 // declarator. Otherwise we could get follow-up errors. 876 D.getMutableDeclSpec().ClearStorageClassSpecs(); 877 } 878 } 879 break; 880 default: 881 if (DS.getStorageClassSpecLoc().isValid()) 882 Diag(DS.getStorageClassSpecLoc(), 883 diag::err_storageclass_invalid_for_member); 884 else 885 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 886 D.getMutableDeclSpec().ClearStorageClassSpecs(); 887 } 888 889 if (!isFunc && 890 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 891 D.getNumTypeObjects() == 0) { 892 // Check also for this case: 893 // 894 // typedef int f(); 895 // f a; 896 // 897 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 898 isFunc = TDType->isFunctionType(); 899 } 900 901 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 902 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 903 !isFunc); 904 905 Decl *Member; 906 if (isInstField) { 907 // FIXME: Check for template parameters! 908 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 909 AS); 910 assert(Member && "HandleField never returns null"); 911 } else { 912 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 913 .getAs<Decl>(); 914 if (!Member) { 915 if (BitWidth) DeleteExpr(BitWidth); 916 return DeclPtrTy(); 917 } 918 919 // Non-instance-fields can't have a bitfield. 920 if (BitWidth) { 921 if (Member->isInvalidDecl()) { 922 // don't emit another diagnostic. 923 } else if (isa<VarDecl>(Member)) { 924 // C++ 9.6p3: A bit-field shall not be a static member. 925 // "static member 'A' cannot be a bit-field" 926 Diag(Loc, diag::err_static_not_bitfield) 927 << Name << BitWidth->getSourceRange(); 928 } else if (isa<TypedefDecl>(Member)) { 929 // "typedef member 'x' cannot be a bit-field" 930 Diag(Loc, diag::err_typedef_not_bitfield) 931 << Name << BitWidth->getSourceRange(); 932 } else { 933 // A function typedef ("typedef int f(); f a;"). 934 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 935 Diag(Loc, diag::err_not_integral_type_bitfield) 936 << Name << cast<ValueDecl>(Member)->getType() 937 << BitWidth->getSourceRange(); 938 } 939 940 DeleteExpr(BitWidth); 941 BitWidth = 0; 942 Member->setInvalidDecl(); 943 } 944 945 Member->setAccess(AS); 946 947 // If we have declared a member function template, set the access of the 948 // templated declaration as well. 949 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 950 FunTmpl->getTemplatedDecl()->setAccess(AS); 951 } 952 953 assert((Name || isInstField) && "No identifier for non-field ?"); 954 955 if (Init) 956 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 957 if (Deleted) // FIXME: Source location is not very good. 958 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 959 960 if (isInstField) { 961 FieldCollector->Add(cast<FieldDecl>(Member)); 962 return DeclPtrTy(); 963 } 964 return DeclPtrTy::make(Member); 965} 966 967/// \brief Find the direct and/or virtual base specifiers that 968/// correspond to the given base type, for use in base initialization 969/// within a constructor. 970static bool FindBaseInitializer(Sema &SemaRef, 971 CXXRecordDecl *ClassDecl, 972 QualType BaseType, 973 const CXXBaseSpecifier *&DirectBaseSpec, 974 const CXXBaseSpecifier *&VirtualBaseSpec) { 975 // First, check for a direct base class. 976 DirectBaseSpec = 0; 977 for (CXXRecordDecl::base_class_const_iterator Base 978 = ClassDecl->bases_begin(); 979 Base != ClassDecl->bases_end(); ++Base) { 980 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 981 // We found a direct base of this type. That's what we're 982 // initializing. 983 DirectBaseSpec = &*Base; 984 break; 985 } 986 } 987 988 // Check for a virtual base class. 989 // FIXME: We might be able to short-circuit this if we know in advance that 990 // there are no virtual bases. 991 VirtualBaseSpec = 0; 992 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 993 // We haven't found a base yet; search the class hierarchy for a 994 // virtual base class. 995 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 996 /*DetectVirtual=*/false); 997 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 998 BaseType, Paths)) { 999 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1000 Path != Paths.end(); ++Path) { 1001 if (Path->back().Base->isVirtual()) { 1002 VirtualBaseSpec = Path->back().Base; 1003 break; 1004 } 1005 } 1006 } 1007 } 1008 1009 return DirectBaseSpec || VirtualBaseSpec; 1010} 1011 1012/// ActOnMemInitializer - Handle a C++ member initializer. 1013Sema::MemInitResult 1014Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1015 Scope *S, 1016 CXXScopeSpec &SS, 1017 IdentifierInfo *MemberOrBase, 1018 TypeTy *TemplateTypeTy, 1019 SourceLocation IdLoc, 1020 SourceLocation LParenLoc, 1021 ExprTy **Args, unsigned NumArgs, 1022 SourceLocation *CommaLocs, 1023 SourceLocation RParenLoc) { 1024 if (!ConstructorD) 1025 return true; 1026 1027 AdjustDeclIfTemplate(ConstructorD); 1028 1029 CXXConstructorDecl *Constructor 1030 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1031 if (!Constructor) { 1032 // The user wrote a constructor initializer on a function that is 1033 // not a C++ constructor. Ignore the error for now, because we may 1034 // have more member initializers coming; we'll diagnose it just 1035 // once in ActOnMemInitializers. 1036 return true; 1037 } 1038 1039 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1040 1041 // C++ [class.base.init]p2: 1042 // Names in a mem-initializer-id are looked up in the scope of the 1043 // constructor’s class and, if not found in that scope, are looked 1044 // up in the scope containing the constructor’s 1045 // definition. [Note: if the constructor’s class contains a member 1046 // with the same name as a direct or virtual base class of the 1047 // class, a mem-initializer-id naming the member or base class and 1048 // composed of a single identifier refers to the class member. A 1049 // mem-initializer-id for the hidden base class may be specified 1050 // using a qualified name. ] 1051 if (!SS.getScopeRep() && !TemplateTypeTy) { 1052 // Look for a member, first. 1053 FieldDecl *Member = 0; 1054 DeclContext::lookup_result Result 1055 = ClassDecl->lookup(MemberOrBase); 1056 if (Result.first != Result.second) 1057 Member = dyn_cast<FieldDecl>(*Result.first); 1058 1059 // FIXME: Handle members of an anonymous union. 1060 1061 if (Member) 1062 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1063 LParenLoc, RParenLoc); 1064 } 1065 // It didn't name a member, so see if it names a class. 1066 QualType BaseType; 1067 TypeSourceInfo *TInfo = 0; 1068 1069 if (TemplateTypeTy) { 1070 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1071 } else { 1072 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1073 LookupParsedName(R, S, &SS); 1074 1075 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1076 if (!TyD) { 1077 if (R.isAmbiguous()) return true; 1078 1079 // We don't want access-control diagnostics here. 1080 R.suppressDiagnostics(); 1081 1082 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1083 bool NotUnknownSpecialization = false; 1084 DeclContext *DC = computeDeclContext(SS, false); 1085 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1086 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1087 1088 if (!NotUnknownSpecialization) { 1089 // When the scope specifier can refer to a member of an unknown 1090 // specialization, we take it as a type name. 1091 BaseType = CheckTypenameType((NestedNameSpecifier *)SS.getScopeRep(), 1092 *MemberOrBase, SS.getRange()); 1093 if (BaseType.isNull()) 1094 return true; 1095 1096 R.clear(); 1097 } 1098 } 1099 1100 // If no results were found, try to correct typos. 1101 if (R.empty() && BaseType.isNull() && 1102 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1103 R.isSingleResult()) { 1104 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1105 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1106 // We have found a non-static data member with a similar 1107 // name to what was typed; complain and initialize that 1108 // member. 1109 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1110 << MemberOrBase << true << R.getLookupName() 1111 << FixItHint::CreateReplacement(R.getNameLoc(), 1112 R.getLookupName().getAsString()); 1113 Diag(Member->getLocation(), diag::note_previous_decl) 1114 << Member->getDeclName(); 1115 1116 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1117 LParenLoc, RParenLoc); 1118 } 1119 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1120 const CXXBaseSpecifier *DirectBaseSpec; 1121 const CXXBaseSpecifier *VirtualBaseSpec; 1122 if (FindBaseInitializer(*this, ClassDecl, 1123 Context.getTypeDeclType(Type), 1124 DirectBaseSpec, VirtualBaseSpec)) { 1125 // We have found a direct or virtual base class with a 1126 // similar name to what was typed; complain and initialize 1127 // that base class. 1128 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1129 << MemberOrBase << false << R.getLookupName() 1130 << FixItHint::CreateReplacement(R.getNameLoc(), 1131 R.getLookupName().getAsString()); 1132 1133 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1134 : VirtualBaseSpec; 1135 Diag(BaseSpec->getSourceRange().getBegin(), 1136 diag::note_base_class_specified_here) 1137 << BaseSpec->getType() 1138 << BaseSpec->getSourceRange(); 1139 1140 TyD = Type; 1141 } 1142 } 1143 } 1144 1145 if (!TyD && BaseType.isNull()) { 1146 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1147 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1148 return true; 1149 } 1150 } 1151 1152 if (BaseType.isNull()) { 1153 BaseType = Context.getTypeDeclType(TyD); 1154 if (SS.isSet()) { 1155 NestedNameSpecifier *Qualifier = 1156 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1157 1158 // FIXME: preserve source range information 1159 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1160 } 1161 } 1162 } 1163 1164 if (!TInfo) 1165 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1166 1167 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1168 LParenLoc, RParenLoc, ClassDecl); 1169} 1170 1171/// Checks an initializer expression for use of uninitialized fields, such as 1172/// containing the field that is being initialized. Returns true if there is an 1173/// uninitialized field was used an updates the SourceLocation parameter; false 1174/// otherwise. 1175static bool InitExprContainsUninitializedFields(const Stmt* S, 1176 const FieldDecl* LhsField, 1177 SourceLocation* L) { 1178 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1179 if (ME) { 1180 const NamedDecl* RhsField = ME->getMemberDecl(); 1181 if (RhsField == LhsField) { 1182 // Initializing a field with itself. Throw a warning. 1183 // But wait; there are exceptions! 1184 // Exception #1: The field may not belong to this record. 1185 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1186 const Expr* base = ME->getBase(); 1187 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1188 // Even though the field matches, it does not belong to this record. 1189 return false; 1190 } 1191 // None of the exceptions triggered; return true to indicate an 1192 // uninitialized field was used. 1193 *L = ME->getMemberLoc(); 1194 return true; 1195 } 1196 } 1197 bool found = false; 1198 for (Stmt::const_child_iterator it = S->child_begin(); 1199 it != S->child_end() && found == false; 1200 ++it) { 1201 if (isa<CallExpr>(S)) { 1202 // Do not descend into function calls or constructors, as the use 1203 // of an uninitialized field may be valid. One would have to inspect 1204 // the contents of the function/ctor to determine if it is safe or not. 1205 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1206 // may be safe, depending on what the function/ctor does. 1207 continue; 1208 } 1209 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1210 } 1211 return found; 1212} 1213 1214Sema::MemInitResult 1215Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1216 unsigned NumArgs, SourceLocation IdLoc, 1217 SourceLocation LParenLoc, 1218 SourceLocation RParenLoc) { 1219 // Diagnose value-uses of fields to initialize themselves, e.g. 1220 // foo(foo) 1221 // where foo is not also a parameter to the constructor. 1222 // TODO: implement -Wuninitialized and fold this into that framework. 1223 for (unsigned i = 0; i < NumArgs; ++i) { 1224 SourceLocation L; 1225 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1226 // FIXME: Return true in the case when other fields are used before being 1227 // uninitialized. For example, let this field be the i'th field. When 1228 // initializing the i'th field, throw a warning if any of the >= i'th 1229 // fields are used, as they are not yet initialized. 1230 // Right now we are only handling the case where the i'th field uses 1231 // itself in its initializer. 1232 Diag(L, diag::warn_field_is_uninit); 1233 } 1234 } 1235 1236 bool HasDependentArg = false; 1237 for (unsigned i = 0; i < NumArgs; i++) 1238 HasDependentArg |= Args[i]->isTypeDependent(); 1239 1240 QualType FieldType = Member->getType(); 1241 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1242 FieldType = Array->getElementType(); 1243 if (FieldType->isDependentType() || HasDependentArg) { 1244 // Can't check initialization for a member of dependent type or when 1245 // any of the arguments are type-dependent expressions. 1246 OwningExprResult Init 1247 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1248 RParenLoc)); 1249 1250 // Erase any temporaries within this evaluation context; we're not 1251 // going to track them in the AST, since we'll be rebuilding the 1252 // ASTs during template instantiation. 1253 ExprTemporaries.erase( 1254 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1255 ExprTemporaries.end()); 1256 1257 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1258 LParenLoc, 1259 Init.takeAs<Expr>(), 1260 RParenLoc); 1261 1262 } 1263 1264 if (Member->isInvalidDecl()) 1265 return true; 1266 1267 // Initialize the member. 1268 InitializedEntity MemberEntity = 1269 InitializedEntity::InitializeMember(Member, 0); 1270 InitializationKind Kind = 1271 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1272 1273 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1274 1275 OwningExprResult MemberInit = 1276 InitSeq.Perform(*this, MemberEntity, Kind, 1277 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1278 if (MemberInit.isInvalid()) 1279 return true; 1280 1281 // C++0x [class.base.init]p7: 1282 // The initialization of each base and member constitutes a 1283 // full-expression. 1284 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1285 if (MemberInit.isInvalid()) 1286 return true; 1287 1288 // If we are in a dependent context, template instantiation will 1289 // perform this type-checking again. Just save the arguments that we 1290 // received in a ParenListExpr. 1291 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1292 // of the information that we have about the member 1293 // initializer. However, deconstructing the ASTs is a dicey process, 1294 // and this approach is far more likely to get the corner cases right. 1295 if (CurContext->isDependentContext()) { 1296 // Bump the reference count of all of the arguments. 1297 for (unsigned I = 0; I != NumArgs; ++I) 1298 Args[I]->Retain(); 1299 1300 OwningExprResult Init 1301 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1302 RParenLoc)); 1303 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1304 LParenLoc, 1305 Init.takeAs<Expr>(), 1306 RParenLoc); 1307 } 1308 1309 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1310 LParenLoc, 1311 MemberInit.takeAs<Expr>(), 1312 RParenLoc); 1313} 1314 1315Sema::MemInitResult 1316Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1317 Expr **Args, unsigned NumArgs, 1318 SourceLocation LParenLoc, SourceLocation RParenLoc, 1319 CXXRecordDecl *ClassDecl) { 1320 bool HasDependentArg = false; 1321 for (unsigned i = 0; i < NumArgs; i++) 1322 HasDependentArg |= Args[i]->isTypeDependent(); 1323 1324 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1325 if (BaseType->isDependentType() || HasDependentArg) { 1326 // Can't check initialization for a base of dependent type or when 1327 // any of the arguments are type-dependent expressions. 1328 OwningExprResult BaseInit 1329 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1330 RParenLoc)); 1331 1332 // Erase any temporaries within this evaluation context; we're not 1333 // going to track them in the AST, since we'll be rebuilding the 1334 // ASTs during template instantiation. 1335 ExprTemporaries.erase( 1336 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1337 ExprTemporaries.end()); 1338 1339 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1340 /*IsVirtual=*/false, 1341 LParenLoc, 1342 BaseInit.takeAs<Expr>(), 1343 RParenLoc); 1344 } 1345 1346 if (!BaseType->isRecordType()) 1347 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1348 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1349 1350 // C++ [class.base.init]p2: 1351 // [...] Unless the mem-initializer-id names a nonstatic data 1352 // member of the constructor’s class or a direct or virtual base 1353 // of that class, the mem-initializer is ill-formed. A 1354 // mem-initializer-list can initialize a base class using any 1355 // name that denotes that base class type. 1356 1357 // Check for direct and virtual base classes. 1358 const CXXBaseSpecifier *DirectBaseSpec = 0; 1359 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1360 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1361 VirtualBaseSpec); 1362 1363 // C++ [base.class.init]p2: 1364 // If a mem-initializer-id is ambiguous because it designates both 1365 // a direct non-virtual base class and an inherited virtual base 1366 // class, the mem-initializer is ill-formed. 1367 if (DirectBaseSpec && VirtualBaseSpec) 1368 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1369 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1370 // C++ [base.class.init]p2: 1371 // Unless the mem-initializer-id names a nonstatic data membeer of the 1372 // constructor's class ot a direst or virtual base of that class, the 1373 // mem-initializer is ill-formed. 1374 if (!DirectBaseSpec && !VirtualBaseSpec) 1375 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1376 << BaseType << ClassDecl->getNameAsCString() 1377 << BaseTInfo->getTypeLoc().getSourceRange(); 1378 1379 CXXBaseSpecifier *BaseSpec 1380 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1381 if (!BaseSpec) 1382 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1383 1384 // Initialize the base. 1385 InitializedEntity BaseEntity = 1386 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1387 InitializationKind Kind = 1388 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1389 1390 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1391 1392 OwningExprResult BaseInit = 1393 InitSeq.Perform(*this, BaseEntity, Kind, 1394 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1395 if (BaseInit.isInvalid()) 1396 return true; 1397 1398 // C++0x [class.base.init]p7: 1399 // The initialization of each base and member constitutes a 1400 // full-expression. 1401 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1402 if (BaseInit.isInvalid()) 1403 return true; 1404 1405 // If we are in a dependent context, template instantiation will 1406 // perform this type-checking again. Just save the arguments that we 1407 // received in a ParenListExpr. 1408 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1409 // of the information that we have about the base 1410 // initializer. However, deconstructing the ASTs is a dicey process, 1411 // and this approach is far more likely to get the corner cases right. 1412 if (CurContext->isDependentContext()) { 1413 // Bump the reference count of all of the arguments. 1414 for (unsigned I = 0; I != NumArgs; ++I) 1415 Args[I]->Retain(); 1416 1417 OwningExprResult Init 1418 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1419 RParenLoc)); 1420 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1421 BaseSpec->isVirtual(), 1422 LParenLoc, 1423 Init.takeAs<Expr>(), 1424 RParenLoc); 1425 } 1426 1427 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1428 BaseSpec->isVirtual(), 1429 LParenLoc, 1430 BaseInit.takeAs<Expr>(), 1431 RParenLoc); 1432} 1433 1434/// ImplicitInitializerKind - How an implicit base or member initializer should 1435/// initialize its base or member. 1436enum ImplicitInitializerKind { 1437 IIK_Default, 1438 IIK_Copy, 1439 IIK_Move 1440}; 1441 1442static bool 1443BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1444 ImplicitInitializerKind ImplicitInitKind, 1445 CXXBaseSpecifier *BaseSpec, 1446 bool IsInheritedVirtualBase, 1447 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1448 InitializedEntity InitEntity 1449 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1450 IsInheritedVirtualBase); 1451 1452 Sema::OwningExprResult BaseInit(SemaRef); 1453 1454 switch (ImplicitInitKind) { 1455 case IIK_Default: { 1456 InitializationKind InitKind 1457 = InitializationKind::CreateDefault(Constructor->getLocation()); 1458 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1459 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1460 Sema::MultiExprArg(SemaRef, 0, 0)); 1461 break; 1462 } 1463 1464 case IIK_Copy: { 1465 ParmVarDecl *Param = Constructor->getParamDecl(0); 1466 QualType ParamType = Param->getType().getNonReferenceType(); 1467 1468 Expr *CopyCtorArg = 1469 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1470 SourceLocation(), ParamType, 0); 1471 1472 InitializationKind InitKind 1473 = InitializationKind::CreateDirect(Constructor->getLocation(), 1474 SourceLocation(), SourceLocation()); 1475 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1476 &CopyCtorArg, 1); 1477 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1478 Sema::MultiExprArg(SemaRef, 1479 (void**)&CopyCtorArg, 1)); 1480 break; 1481 } 1482 1483 case IIK_Move: 1484 assert(false && "Unhandled initializer kind!"); 1485 } 1486 1487 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1488 if (BaseInit.isInvalid()) 1489 return true; 1490 1491 CXXBaseInit = 1492 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1493 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1494 SourceLocation()), 1495 BaseSpec->isVirtual(), 1496 SourceLocation(), 1497 BaseInit.takeAs<Expr>(), 1498 SourceLocation()); 1499 1500 return false; 1501} 1502 1503static bool 1504BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1505 ImplicitInitializerKind ImplicitInitKind, 1506 FieldDecl *Field, 1507 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1508 if (ImplicitInitKind == IIK_Copy) { 1509 ParmVarDecl *Param = Constructor->getParamDecl(0); 1510 QualType ParamType = Param->getType().getNonReferenceType(); 1511 1512 Expr *MemberExprBase = 1513 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1514 SourceLocation(), ParamType, 0); 1515 1516 1517 Expr *CopyCtorArg = 1518 MemberExpr::Create(SemaRef.Context, MemberExprBase, /*IsArrow=*/false, 1519 0, SourceRange(), Field, 1520 DeclAccessPair::make(Field, Field->getAccess()), 1521 SourceLocation(), 0, 1522 Field->getType().getNonReferenceType()); 1523 1524 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1525 InitializationKind InitKind = 1526 InitializationKind::CreateDirect(Constructor->getLocation(), 1527 SourceLocation(), SourceLocation()); 1528 1529 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1530 &CopyCtorArg, 1); 1531 1532 Sema::OwningExprResult MemberInit = 1533 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1534 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArg, 1), 0); 1535 if (MemberInit.isInvalid()) 1536 return true; 1537 1538 CXXMemberInit = 0; 1539 return false; 1540 } 1541 1542 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1543 1544 QualType FieldBaseElementType = 1545 SemaRef.Context.getBaseElementType(Field->getType()); 1546 1547 if (FieldBaseElementType->isRecordType()) { 1548 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1549 InitializationKind InitKind = 1550 InitializationKind::CreateDefault(Constructor->getLocation()); 1551 1552 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1553 Sema::OwningExprResult MemberInit = 1554 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1555 Sema::MultiExprArg(SemaRef, 0, 0)); 1556 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1557 if (MemberInit.isInvalid()) 1558 return true; 1559 1560 CXXMemberInit = 1561 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1562 Field, SourceLocation(), 1563 SourceLocation(), 1564 MemberInit.takeAs<Expr>(), 1565 SourceLocation()); 1566 return false; 1567 } 1568 1569 if (FieldBaseElementType->isReferenceType()) { 1570 SemaRef.Diag(Constructor->getLocation(), 1571 diag::err_uninitialized_member_in_ctor) 1572 << (int)Constructor->isImplicit() 1573 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1574 << 0 << Field->getDeclName(); 1575 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1576 return true; 1577 } 1578 1579 if (FieldBaseElementType.isConstQualified()) { 1580 SemaRef.Diag(Constructor->getLocation(), 1581 diag::err_uninitialized_member_in_ctor) 1582 << (int)Constructor->isImplicit() 1583 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1584 << 1 << Field->getDeclName(); 1585 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1586 return true; 1587 } 1588 1589 // Nothing to initialize. 1590 CXXMemberInit = 0; 1591 return false; 1592} 1593 1594bool 1595Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1596 CXXBaseOrMemberInitializer **Initializers, 1597 unsigned NumInitializers, 1598 bool AnyErrors) { 1599 if (Constructor->getDeclContext()->isDependentContext()) { 1600 // Just store the initializers as written, they will be checked during 1601 // instantiation. 1602 if (NumInitializers > 0) { 1603 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1604 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1605 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1606 memcpy(baseOrMemberInitializers, Initializers, 1607 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1608 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1609 } 1610 1611 return false; 1612 } 1613 1614 ImplicitInitializerKind ImplicitInitKind = IIK_Default; 1615 1616 // FIXME: Handle implicit move constructors. 1617 if (Constructor->isImplicit() && Constructor->isCopyConstructor()) 1618 ImplicitInitKind = IIK_Copy; 1619 1620 // We need to build the initializer AST according to order of construction 1621 // and not what user specified in the Initializers list. 1622 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1623 if (!ClassDecl) 1624 return true; 1625 1626 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1627 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1628 bool HadError = false; 1629 1630 for (unsigned i = 0; i < NumInitializers; i++) { 1631 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1632 1633 if (Member->isBaseInitializer()) 1634 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1635 else 1636 AllBaseFields[Member->getMember()] = Member; 1637 } 1638 1639 // Keep track of the direct virtual bases. 1640 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1641 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1642 E = ClassDecl->bases_end(); I != E; ++I) { 1643 if (I->isVirtual()) 1644 DirectVBases.insert(I); 1645 } 1646 1647 // Push virtual bases before others. 1648 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1649 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1650 1651 if (CXXBaseOrMemberInitializer *Value 1652 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1653 AllToInit.push_back(Value); 1654 } else if (!AnyErrors) { 1655 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1656 CXXBaseOrMemberInitializer *CXXBaseInit; 1657 if (BuildImplicitBaseInitializer(*this, Constructor, ImplicitInitKind, 1658 VBase, IsInheritedVirtualBase, 1659 CXXBaseInit)) { 1660 HadError = true; 1661 continue; 1662 } 1663 1664 AllToInit.push_back(CXXBaseInit); 1665 } 1666 } 1667 1668 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1669 E = ClassDecl->bases_end(); Base != E; ++Base) { 1670 // Virtuals are in the virtual base list and already constructed. 1671 if (Base->isVirtual()) 1672 continue; 1673 1674 if (CXXBaseOrMemberInitializer *Value 1675 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1676 AllToInit.push_back(Value); 1677 } else if (!AnyErrors) { 1678 CXXBaseOrMemberInitializer *CXXBaseInit; 1679 if (BuildImplicitBaseInitializer(*this, Constructor, ImplicitInitKind, 1680 Base, /*IsInheritedVirtualBase=*/false, 1681 CXXBaseInit)) { 1682 HadError = true; 1683 continue; 1684 } 1685 1686 AllToInit.push_back(CXXBaseInit); 1687 } 1688 } 1689 1690 // non-static data members. 1691 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1692 E = ClassDecl->field_end(); Field != E; ++Field) { 1693 if ((*Field)->isAnonymousStructOrUnion()) { 1694 if (const RecordType *FieldClassType = 1695 Field->getType()->getAs<RecordType>()) { 1696 CXXRecordDecl *FieldClassDecl 1697 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1698 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1699 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1700 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1701 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1702 // set to the anonymous union data member used in the initializer 1703 // list. 1704 Value->setMember(*Field); 1705 Value->setAnonUnionMember(*FA); 1706 AllToInit.push_back(Value); 1707 break; 1708 } 1709 } 1710 } 1711 continue; 1712 } 1713 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1714 AllToInit.push_back(Value); 1715 continue; 1716 } 1717 1718 if (AnyErrors) 1719 continue; 1720 1721 CXXBaseOrMemberInitializer *Member; 1722 if (BuildImplicitMemberInitializer(*this, Constructor, ImplicitInitKind, 1723 *Field, Member)) { 1724 HadError = true; 1725 continue; 1726 } 1727 1728 // If the member doesn't need to be initialized, it will be null. 1729 if (Member) 1730 AllToInit.push_back(Member); 1731 } 1732 1733 NumInitializers = AllToInit.size(); 1734 if (NumInitializers > 0) { 1735 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1736 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1737 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1738 memcpy(baseOrMemberInitializers, AllToInit.data(), 1739 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1740 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1741 1742 // Constructors implicitly reference the base and member 1743 // destructors. 1744 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1745 Constructor->getParent()); 1746 } 1747 1748 return HadError; 1749} 1750 1751static void *GetKeyForTopLevelField(FieldDecl *Field) { 1752 // For anonymous unions, use the class declaration as the key. 1753 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1754 if (RT->getDecl()->isAnonymousStructOrUnion()) 1755 return static_cast<void *>(RT->getDecl()); 1756 } 1757 return static_cast<void *>(Field); 1758} 1759 1760static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1761 return Context.getCanonicalType(BaseType).getTypePtr(); 1762} 1763 1764static void *GetKeyForMember(ASTContext &Context, 1765 CXXBaseOrMemberInitializer *Member, 1766 bool MemberMaybeAnon = false) { 1767 if (!Member->isMemberInitializer()) 1768 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1769 1770 // For fields injected into the class via declaration of an anonymous union, 1771 // use its anonymous union class declaration as the unique key. 1772 FieldDecl *Field = Member->getMember(); 1773 1774 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1775 // data member of the class. Data member used in the initializer list is 1776 // in AnonUnionMember field. 1777 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1778 Field = Member->getAnonUnionMember(); 1779 1780 // If the field is a member of an anonymous struct or union, our key 1781 // is the anonymous record decl that's a direct child of the class. 1782 RecordDecl *RD = Field->getParent(); 1783 if (RD->isAnonymousStructOrUnion()) { 1784 while (true) { 1785 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1786 if (Parent->isAnonymousStructOrUnion()) 1787 RD = Parent; 1788 else 1789 break; 1790 } 1791 1792 return static_cast<void *>(RD); 1793 } 1794 1795 return static_cast<void *>(Field); 1796} 1797 1798static void 1799DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1800 const CXXConstructorDecl *Constructor, 1801 CXXBaseOrMemberInitializer **Inits, 1802 unsigned NumInits) { 1803 if (Constructor->getDeclContext()->isDependentContext()) 1804 return; 1805 1806 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1807 == Diagnostic::Ignored) 1808 return; 1809 1810 // Build the list of bases and members in the order that they'll 1811 // actually be initialized. The explicit initializers should be in 1812 // this same order but may be missing things. 1813 llvm::SmallVector<const void*, 32> IdealInitKeys; 1814 1815 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1816 1817 // 1. Virtual bases. 1818 for (CXXRecordDecl::base_class_const_iterator VBase = 1819 ClassDecl->vbases_begin(), 1820 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1821 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 1822 1823 // 2. Non-virtual bases. 1824 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 1825 E = ClassDecl->bases_end(); Base != E; ++Base) { 1826 if (Base->isVirtual()) 1827 continue; 1828 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 1829 } 1830 1831 // 3. Direct fields. 1832 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1833 E = ClassDecl->field_end(); Field != E; ++Field) 1834 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 1835 1836 unsigned NumIdealInits = IdealInitKeys.size(); 1837 unsigned IdealIndex = 0; 1838 1839 CXXBaseOrMemberInitializer *PrevInit = 0; 1840 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 1841 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 1842 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 1843 1844 // Scan forward to try to find this initializer in the idealized 1845 // initializers list. 1846 for (; IdealIndex != NumIdealInits; ++IdealIndex) 1847 if (InitKey == IdealInitKeys[IdealIndex]) 1848 break; 1849 1850 // If we didn't find this initializer, it must be because we 1851 // scanned past it on a previous iteration. That can only 1852 // happen if we're out of order; emit a warning. 1853 if (IdealIndex == NumIdealInits) { 1854 assert(PrevInit && "initializer not found in initializer list"); 1855 1856 Sema::SemaDiagnosticBuilder D = 1857 SemaRef.Diag(PrevInit->getSourceLocation(), 1858 diag::warn_initializer_out_of_order); 1859 1860 if (PrevInit->isMemberInitializer()) 1861 D << 0 << PrevInit->getMember()->getDeclName(); 1862 else 1863 D << 1 << PrevInit->getBaseClassInfo()->getType(); 1864 1865 if (Init->isMemberInitializer()) 1866 D << 0 << Init->getMember()->getDeclName(); 1867 else 1868 D << 1 << Init->getBaseClassInfo()->getType(); 1869 1870 // Move back to the initializer's location in the ideal list. 1871 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 1872 if (InitKey == IdealInitKeys[IdealIndex]) 1873 break; 1874 1875 assert(IdealIndex != NumIdealInits && 1876 "initializer not found in initializer list"); 1877 } 1878 1879 PrevInit = Init; 1880 } 1881} 1882 1883namespace { 1884bool CheckRedundantInit(Sema &S, 1885 CXXBaseOrMemberInitializer *Init, 1886 CXXBaseOrMemberInitializer *&PrevInit) { 1887 if (!PrevInit) { 1888 PrevInit = Init; 1889 return false; 1890 } 1891 1892 if (FieldDecl *Field = Init->getMember()) 1893 S.Diag(Init->getSourceLocation(), 1894 diag::err_multiple_mem_initialization) 1895 << Field->getDeclName() 1896 << Init->getSourceRange(); 1897 else { 1898 Type *BaseClass = Init->getBaseClass(); 1899 assert(BaseClass && "neither field nor base"); 1900 S.Diag(Init->getSourceLocation(), 1901 diag::err_multiple_base_initialization) 1902 << QualType(BaseClass, 0) 1903 << Init->getSourceRange(); 1904 } 1905 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 1906 << 0 << PrevInit->getSourceRange(); 1907 1908 return true; 1909} 1910 1911typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 1912typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 1913 1914bool CheckRedundantUnionInit(Sema &S, 1915 CXXBaseOrMemberInitializer *Init, 1916 RedundantUnionMap &Unions) { 1917 FieldDecl *Field = Init->getMember(); 1918 RecordDecl *Parent = Field->getParent(); 1919 if (!Parent->isAnonymousStructOrUnion()) 1920 return false; 1921 1922 NamedDecl *Child = Field; 1923 do { 1924 if (Parent->isUnion()) { 1925 UnionEntry &En = Unions[Parent]; 1926 if (En.first && En.first != Child) { 1927 S.Diag(Init->getSourceLocation(), 1928 diag::err_multiple_mem_union_initialization) 1929 << Field->getDeclName() 1930 << Init->getSourceRange(); 1931 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 1932 << 0 << En.second->getSourceRange(); 1933 return true; 1934 } else if (!En.first) { 1935 En.first = Child; 1936 En.second = Init; 1937 } 1938 } 1939 1940 Child = Parent; 1941 Parent = cast<RecordDecl>(Parent->getDeclContext()); 1942 } while (Parent->isAnonymousStructOrUnion()); 1943 1944 return false; 1945} 1946} 1947 1948/// ActOnMemInitializers - Handle the member initializers for a constructor. 1949void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1950 SourceLocation ColonLoc, 1951 MemInitTy **meminits, unsigned NumMemInits, 1952 bool AnyErrors) { 1953 if (!ConstructorDecl) 1954 return; 1955 1956 AdjustDeclIfTemplate(ConstructorDecl); 1957 1958 CXXConstructorDecl *Constructor 1959 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1960 1961 if (!Constructor) { 1962 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1963 return; 1964 } 1965 1966 CXXBaseOrMemberInitializer **MemInits = 1967 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 1968 1969 // Mapping for the duplicate initializers check. 1970 // For member initializers, this is keyed with a FieldDecl*. 1971 // For base initializers, this is keyed with a Type*. 1972 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 1973 1974 // Mapping for the inconsistent anonymous-union initializers check. 1975 RedundantUnionMap MemberUnions; 1976 1977 bool HadError = false; 1978 for (unsigned i = 0; i < NumMemInits; i++) { 1979 CXXBaseOrMemberInitializer *Init = MemInits[i]; 1980 1981 if (Init->isMemberInitializer()) { 1982 FieldDecl *Field = Init->getMember(); 1983 if (CheckRedundantInit(*this, Init, Members[Field]) || 1984 CheckRedundantUnionInit(*this, Init, MemberUnions)) 1985 HadError = true; 1986 } else { 1987 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 1988 if (CheckRedundantInit(*this, Init, Members[Key])) 1989 HadError = true; 1990 } 1991 } 1992 1993 if (HadError) 1994 return; 1995 1996 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 1997 1998 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 1999} 2000 2001void 2002Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2003 CXXRecordDecl *ClassDecl) { 2004 // Ignore dependent contexts. 2005 if (ClassDecl->isDependentContext()) 2006 return; 2007 2008 // FIXME: all the access-control diagnostics are positioned on the 2009 // field/base declaration. That's probably good; that said, the 2010 // user might reasonably want to know why the destructor is being 2011 // emitted, and we currently don't say. 2012 2013 // Non-static data members. 2014 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2015 E = ClassDecl->field_end(); I != E; ++I) { 2016 FieldDecl *Field = *I; 2017 2018 QualType FieldType = Context.getBaseElementType(Field->getType()); 2019 2020 const RecordType* RT = FieldType->getAs<RecordType>(); 2021 if (!RT) 2022 continue; 2023 2024 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2025 if (FieldClassDecl->hasTrivialDestructor()) 2026 continue; 2027 2028 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 2029 CheckDestructorAccess(Field->getLocation(), Dtor, 2030 PDiag(diag::err_access_dtor_field) 2031 << Field->getDeclName() 2032 << FieldType); 2033 2034 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2035 } 2036 2037 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2038 2039 // Bases. 2040 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2041 E = ClassDecl->bases_end(); Base != E; ++Base) { 2042 // Bases are always records in a well-formed non-dependent class. 2043 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2044 2045 // Remember direct virtual bases. 2046 if (Base->isVirtual()) 2047 DirectVirtualBases.insert(RT); 2048 2049 // Ignore trivial destructors. 2050 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2051 if (BaseClassDecl->hasTrivialDestructor()) 2052 continue; 2053 2054 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2055 2056 // FIXME: caret should be on the start of the class name 2057 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2058 PDiag(diag::err_access_dtor_base) 2059 << Base->getType() 2060 << Base->getSourceRange()); 2061 2062 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2063 } 2064 2065 // Virtual bases. 2066 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2067 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2068 2069 // Bases are always records in a well-formed non-dependent class. 2070 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2071 2072 // Ignore direct virtual bases. 2073 if (DirectVirtualBases.count(RT)) 2074 continue; 2075 2076 // Ignore trivial destructors. 2077 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2078 if (BaseClassDecl->hasTrivialDestructor()) 2079 continue; 2080 2081 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2082 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2083 PDiag(diag::err_access_dtor_vbase) 2084 << VBase->getType()); 2085 2086 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2087 } 2088} 2089 2090void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2091 if (!CDtorDecl) 2092 return; 2093 2094 if (CXXConstructorDecl *Constructor 2095 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2096 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2097} 2098 2099bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2100 unsigned DiagID, AbstractDiagSelID SelID, 2101 const CXXRecordDecl *CurrentRD) { 2102 if (SelID == -1) 2103 return RequireNonAbstractType(Loc, T, 2104 PDiag(DiagID), CurrentRD); 2105 else 2106 return RequireNonAbstractType(Loc, T, 2107 PDiag(DiagID) << SelID, CurrentRD); 2108} 2109 2110bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2111 const PartialDiagnostic &PD, 2112 const CXXRecordDecl *CurrentRD) { 2113 if (!getLangOptions().CPlusPlus) 2114 return false; 2115 2116 if (const ArrayType *AT = Context.getAsArrayType(T)) 2117 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2118 CurrentRD); 2119 2120 if (const PointerType *PT = T->getAs<PointerType>()) { 2121 // Find the innermost pointer type. 2122 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2123 PT = T; 2124 2125 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2126 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2127 } 2128 2129 const RecordType *RT = T->getAs<RecordType>(); 2130 if (!RT) 2131 return false; 2132 2133 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2134 2135 if (CurrentRD && CurrentRD != RD) 2136 return false; 2137 2138 // FIXME: is this reasonable? It matches current behavior, but.... 2139 if (!RD->getDefinition()) 2140 return false; 2141 2142 if (!RD->isAbstract()) 2143 return false; 2144 2145 Diag(Loc, PD) << RD->getDeclName(); 2146 2147 // Check if we've already emitted the list of pure virtual functions for this 2148 // class. 2149 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2150 return true; 2151 2152 CXXFinalOverriderMap FinalOverriders; 2153 RD->getFinalOverriders(FinalOverriders); 2154 2155 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2156 MEnd = FinalOverriders.end(); 2157 M != MEnd; 2158 ++M) { 2159 for (OverridingMethods::iterator SO = M->second.begin(), 2160 SOEnd = M->second.end(); 2161 SO != SOEnd; ++SO) { 2162 // C++ [class.abstract]p4: 2163 // A class is abstract if it contains or inherits at least one 2164 // pure virtual function for which the final overrider is pure 2165 // virtual. 2166 2167 // 2168 if (SO->second.size() != 1) 2169 continue; 2170 2171 if (!SO->second.front().Method->isPure()) 2172 continue; 2173 2174 Diag(SO->second.front().Method->getLocation(), 2175 diag::note_pure_virtual_function) 2176 << SO->second.front().Method->getDeclName(); 2177 } 2178 } 2179 2180 if (!PureVirtualClassDiagSet) 2181 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2182 PureVirtualClassDiagSet->insert(RD); 2183 2184 return true; 2185} 2186 2187namespace { 2188 class AbstractClassUsageDiagnoser 2189 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2190 Sema &SemaRef; 2191 CXXRecordDecl *AbstractClass; 2192 2193 bool VisitDeclContext(const DeclContext *DC) { 2194 bool Invalid = false; 2195 2196 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2197 E = DC->decls_end(); I != E; ++I) 2198 Invalid |= Visit(*I); 2199 2200 return Invalid; 2201 } 2202 2203 public: 2204 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2205 : SemaRef(SemaRef), AbstractClass(ac) { 2206 Visit(SemaRef.Context.getTranslationUnitDecl()); 2207 } 2208 2209 bool VisitFunctionDecl(const FunctionDecl *FD) { 2210 if (FD->isThisDeclarationADefinition()) { 2211 // No need to do the check if we're in a definition, because it requires 2212 // that the return/param types are complete. 2213 // because that requires 2214 return VisitDeclContext(FD); 2215 } 2216 2217 // Check the return type. 2218 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2219 bool Invalid = 2220 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2221 diag::err_abstract_type_in_decl, 2222 Sema::AbstractReturnType, 2223 AbstractClass); 2224 2225 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2226 E = FD->param_end(); I != E; ++I) { 2227 const ParmVarDecl *VD = *I; 2228 Invalid |= 2229 SemaRef.RequireNonAbstractType(VD->getLocation(), 2230 VD->getOriginalType(), 2231 diag::err_abstract_type_in_decl, 2232 Sema::AbstractParamType, 2233 AbstractClass); 2234 } 2235 2236 return Invalid; 2237 } 2238 2239 bool VisitDecl(const Decl* D) { 2240 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2241 return VisitDeclContext(DC); 2242 2243 return false; 2244 } 2245 }; 2246} 2247 2248/// \brief Perform semantic checks on a class definition that has been 2249/// completing, introducing implicitly-declared members, checking for 2250/// abstract types, etc. 2251void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) { 2252 if (!Record || Record->isInvalidDecl()) 2253 return; 2254 2255 if (!Record->isDependentType()) 2256 AddImplicitlyDeclaredMembersToClass(S, Record); 2257 2258 if (Record->isInvalidDecl()) 2259 return; 2260 2261 // Set access bits correctly on the directly-declared conversions. 2262 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2263 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2264 Convs->setAccess(I, (*I)->getAccess()); 2265 2266 // Determine whether we need to check for final overriders. We do 2267 // this either when there are virtual base classes (in which case we 2268 // may end up finding multiple final overriders for a given virtual 2269 // function) or any of the base classes is abstract (in which case 2270 // we might detect that this class is abstract). 2271 bool CheckFinalOverriders = false; 2272 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2273 !Record->isDependentType()) { 2274 if (Record->getNumVBases()) 2275 CheckFinalOverriders = true; 2276 else if (!Record->isAbstract()) { 2277 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2278 BEnd = Record->bases_end(); 2279 B != BEnd; ++B) { 2280 CXXRecordDecl *BaseDecl 2281 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2282 if (BaseDecl->isAbstract()) { 2283 CheckFinalOverriders = true; 2284 break; 2285 } 2286 } 2287 } 2288 } 2289 2290 if (CheckFinalOverriders) { 2291 CXXFinalOverriderMap FinalOverriders; 2292 Record->getFinalOverriders(FinalOverriders); 2293 2294 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2295 MEnd = FinalOverriders.end(); 2296 M != MEnd; ++M) { 2297 for (OverridingMethods::iterator SO = M->second.begin(), 2298 SOEnd = M->second.end(); 2299 SO != SOEnd; ++SO) { 2300 assert(SO->second.size() > 0 && 2301 "All virtual functions have overridding virtual functions"); 2302 if (SO->second.size() == 1) { 2303 // C++ [class.abstract]p4: 2304 // A class is abstract if it contains or inherits at least one 2305 // pure virtual function for which the final overrider is pure 2306 // virtual. 2307 if (SO->second.front().Method->isPure()) 2308 Record->setAbstract(true); 2309 continue; 2310 } 2311 2312 // C++ [class.virtual]p2: 2313 // In a derived class, if a virtual member function of a base 2314 // class subobject has more than one final overrider the 2315 // program is ill-formed. 2316 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2317 << (NamedDecl *)M->first << Record; 2318 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2319 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2320 OMEnd = SO->second.end(); 2321 OM != OMEnd; ++OM) 2322 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2323 << (NamedDecl *)M->first << OM->Method->getParent(); 2324 2325 Record->setInvalidDecl(); 2326 } 2327 } 2328 } 2329 2330 if (Record->isAbstract() && !Record->isInvalidDecl()) 2331 (void)AbstractClassUsageDiagnoser(*this, Record); 2332 2333 // If this is not an aggregate type and has no user-declared constructor, 2334 // complain about any non-static data members of reference or const scalar 2335 // type, since they will never get initializers. 2336 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2337 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2338 bool Complained = false; 2339 for (RecordDecl::field_iterator F = Record->field_begin(), 2340 FEnd = Record->field_end(); 2341 F != FEnd; ++F) { 2342 if (F->getType()->isReferenceType() || 2343 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2344 if (!Complained) { 2345 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2346 << Record->getTagKind() << Record; 2347 Complained = true; 2348 } 2349 2350 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2351 << F->getType()->isReferenceType() 2352 << F->getDeclName(); 2353 } 2354 } 2355 } 2356} 2357 2358void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2359 DeclPtrTy TagDecl, 2360 SourceLocation LBrac, 2361 SourceLocation RBrac, 2362 AttributeList *AttrList) { 2363 if (!TagDecl) 2364 return; 2365 2366 AdjustDeclIfTemplate(TagDecl); 2367 2368 ActOnFields(S, RLoc, TagDecl, 2369 (DeclPtrTy*)FieldCollector->getCurFields(), 2370 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2371 2372 CheckCompletedCXXClass(S, 2373 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2374} 2375 2376/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2377/// special functions, such as the default constructor, copy 2378/// constructor, or destructor, to the given C++ class (C++ 2379/// [special]p1). This routine can only be executed just before the 2380/// definition of the class is complete. 2381/// 2382/// The scope, if provided, is the class scope. 2383void Sema::AddImplicitlyDeclaredMembersToClass(Scope *S, 2384 CXXRecordDecl *ClassDecl) { 2385 CanQualType ClassType 2386 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2387 2388 // FIXME: Implicit declarations have exception specifications, which are 2389 // the union of the specifications of the implicitly called functions. 2390 2391 if (!ClassDecl->hasUserDeclaredConstructor()) { 2392 // C++ [class.ctor]p5: 2393 // A default constructor for a class X is a constructor of class X 2394 // that can be called without an argument. If there is no 2395 // user-declared constructor for class X, a default constructor is 2396 // implicitly declared. An implicitly-declared default constructor 2397 // is an inline public member of its class. 2398 DeclarationName Name 2399 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2400 CXXConstructorDecl *DefaultCon = 2401 CXXConstructorDecl::Create(Context, ClassDecl, 2402 ClassDecl->getLocation(), Name, 2403 Context.getFunctionType(Context.VoidTy, 2404 0, 0, false, 0, 2405 /*FIXME*/false, false, 2406 0, 0, 2407 FunctionType::ExtInfo()), 2408 /*TInfo=*/0, 2409 /*isExplicit=*/false, 2410 /*isInline=*/true, 2411 /*isImplicitlyDeclared=*/true); 2412 DefaultCon->setAccess(AS_public); 2413 DefaultCon->setImplicit(); 2414 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2415 if (S) 2416 PushOnScopeChains(DefaultCon, S, true); 2417 else 2418 ClassDecl->addDecl(DefaultCon); 2419 } 2420 2421 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2422 // C++ [class.copy]p4: 2423 // If the class definition does not explicitly declare a copy 2424 // constructor, one is declared implicitly. 2425 2426 // C++ [class.copy]p5: 2427 // The implicitly-declared copy constructor for a class X will 2428 // have the form 2429 // 2430 // X::X(const X&) 2431 // 2432 // if 2433 bool HasConstCopyConstructor = true; 2434 2435 // -- each direct or virtual base class B of X has a copy 2436 // constructor whose first parameter is of type const B& or 2437 // const volatile B&, and 2438 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2439 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2440 const CXXRecordDecl *BaseClassDecl 2441 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2442 HasConstCopyConstructor 2443 = BaseClassDecl->hasConstCopyConstructor(Context); 2444 } 2445 2446 // -- for all the nonstatic data members of X that are of a 2447 // class type M (or array thereof), each such class type 2448 // has a copy constructor whose first parameter is of type 2449 // const M& or const volatile M&. 2450 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2451 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2452 ++Field) { 2453 QualType FieldType = (*Field)->getType(); 2454 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2455 FieldType = Array->getElementType(); 2456 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2457 const CXXRecordDecl *FieldClassDecl 2458 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2459 HasConstCopyConstructor 2460 = FieldClassDecl->hasConstCopyConstructor(Context); 2461 } 2462 } 2463 2464 // Otherwise, the implicitly declared copy constructor will have 2465 // the form 2466 // 2467 // X::X(X&) 2468 QualType ArgType = ClassType; 2469 if (HasConstCopyConstructor) 2470 ArgType = ArgType.withConst(); 2471 ArgType = Context.getLValueReferenceType(ArgType); 2472 2473 // An implicitly-declared copy constructor is an inline public 2474 // member of its class. 2475 DeclarationName Name 2476 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2477 CXXConstructorDecl *CopyConstructor 2478 = CXXConstructorDecl::Create(Context, ClassDecl, 2479 ClassDecl->getLocation(), Name, 2480 Context.getFunctionType(Context.VoidTy, 2481 &ArgType, 1, 2482 false, 0, 2483 /*FIXME:*/false, 2484 false, 0, 0, 2485 FunctionType::ExtInfo()), 2486 /*TInfo=*/0, 2487 /*isExplicit=*/false, 2488 /*isInline=*/true, 2489 /*isImplicitlyDeclared=*/true); 2490 CopyConstructor->setAccess(AS_public); 2491 CopyConstructor->setImplicit(); 2492 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2493 2494 // Add the parameter to the constructor. 2495 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2496 ClassDecl->getLocation(), 2497 /*IdentifierInfo=*/0, 2498 ArgType, /*TInfo=*/0, 2499 VarDecl::None, 2500 VarDecl::None, 0); 2501 CopyConstructor->setParams(&FromParam, 1); 2502 if (S) 2503 PushOnScopeChains(CopyConstructor, S, true); 2504 else 2505 ClassDecl->addDecl(CopyConstructor); 2506 } 2507 2508 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2509 // Note: The following rules are largely analoguous to the copy 2510 // constructor rules. Note that virtual bases are not taken into account 2511 // for determining the argument type of the operator. Note also that 2512 // operators taking an object instead of a reference are allowed. 2513 // 2514 // C++ [class.copy]p10: 2515 // If the class definition does not explicitly declare a copy 2516 // assignment operator, one is declared implicitly. 2517 // The implicitly-defined copy assignment operator for a class X 2518 // will have the form 2519 // 2520 // X& X::operator=(const X&) 2521 // 2522 // if 2523 bool HasConstCopyAssignment = true; 2524 2525 // -- each direct base class B of X has a copy assignment operator 2526 // whose parameter is of type const B&, const volatile B& or B, 2527 // and 2528 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2529 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2530 assert(!Base->getType()->isDependentType() && 2531 "Cannot generate implicit members for class with dependent bases."); 2532 const CXXRecordDecl *BaseClassDecl 2533 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2534 const CXXMethodDecl *MD = 0; 2535 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2536 MD); 2537 } 2538 2539 // -- for all the nonstatic data members of X that are of a class 2540 // type M (or array thereof), each such class type has a copy 2541 // assignment operator whose parameter is of type const M&, 2542 // const volatile M& or M. 2543 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2544 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2545 ++Field) { 2546 QualType FieldType = (*Field)->getType(); 2547 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2548 FieldType = Array->getElementType(); 2549 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2550 const CXXRecordDecl *FieldClassDecl 2551 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2552 const CXXMethodDecl *MD = 0; 2553 HasConstCopyAssignment 2554 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2555 } 2556 } 2557 2558 // Otherwise, the implicitly declared copy assignment operator will 2559 // have the form 2560 // 2561 // X& X::operator=(X&) 2562 QualType ArgType = ClassType; 2563 QualType RetType = Context.getLValueReferenceType(ArgType); 2564 if (HasConstCopyAssignment) 2565 ArgType = ArgType.withConst(); 2566 ArgType = Context.getLValueReferenceType(ArgType); 2567 2568 // An implicitly-declared copy assignment operator is an inline public 2569 // member of its class. 2570 DeclarationName Name = 2571 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2572 CXXMethodDecl *CopyAssignment = 2573 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2574 Context.getFunctionType(RetType, &ArgType, 1, 2575 false, 0, 2576 /*FIXME:*/false, 2577 false, 0, 0, 2578 FunctionType::ExtInfo()), 2579 /*TInfo=*/0, /*isStatic=*/false, 2580 /*StorageClassAsWritten=*/FunctionDecl::None, 2581 /*isInline=*/true); 2582 CopyAssignment->setAccess(AS_public); 2583 CopyAssignment->setImplicit(); 2584 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2585 CopyAssignment->setCopyAssignment(true); 2586 2587 // Add the parameter to the operator. 2588 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2589 ClassDecl->getLocation(), 2590 /*IdentifierInfo=*/0, 2591 ArgType, /*TInfo=*/0, 2592 VarDecl::None, 2593 VarDecl::None, 0); 2594 CopyAssignment->setParams(&FromParam, 1); 2595 2596 // Don't call addedAssignmentOperator. There is no way to distinguish an 2597 // implicit from an explicit assignment operator. 2598 if (S) 2599 PushOnScopeChains(CopyAssignment, S, true); 2600 else 2601 ClassDecl->addDecl(CopyAssignment); 2602 AddOverriddenMethods(ClassDecl, CopyAssignment); 2603 } 2604 2605 if (!ClassDecl->hasUserDeclaredDestructor()) { 2606 // C++ [class.dtor]p2: 2607 // If a class has no user-declared destructor, a destructor is 2608 // declared implicitly. An implicitly-declared destructor is an 2609 // inline public member of its class. 2610 QualType Ty = Context.getFunctionType(Context.VoidTy, 2611 0, 0, false, 0, 2612 /*FIXME:*/false, 2613 false, 0, 0, FunctionType::ExtInfo()); 2614 2615 DeclarationName Name 2616 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2617 CXXDestructorDecl *Destructor 2618 = CXXDestructorDecl::Create(Context, ClassDecl, 2619 ClassDecl->getLocation(), Name, Ty, 2620 /*isInline=*/true, 2621 /*isImplicitlyDeclared=*/true); 2622 Destructor->setAccess(AS_public); 2623 Destructor->setImplicit(); 2624 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2625 if (S) 2626 PushOnScopeChains(Destructor, S, true); 2627 else 2628 ClassDecl->addDecl(Destructor); 2629 2630 // This could be uniqued if it ever proves significant. 2631 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2632 2633 AddOverriddenMethods(ClassDecl, Destructor); 2634 } 2635} 2636 2637void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2638 Decl *D = TemplateD.getAs<Decl>(); 2639 if (!D) 2640 return; 2641 2642 TemplateParameterList *Params = 0; 2643 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2644 Params = Template->getTemplateParameters(); 2645 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2646 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2647 Params = PartialSpec->getTemplateParameters(); 2648 else 2649 return; 2650 2651 for (TemplateParameterList::iterator Param = Params->begin(), 2652 ParamEnd = Params->end(); 2653 Param != ParamEnd; ++Param) { 2654 NamedDecl *Named = cast<NamedDecl>(*Param); 2655 if (Named->getDeclName()) { 2656 S->AddDecl(DeclPtrTy::make(Named)); 2657 IdResolver.AddDecl(Named); 2658 } 2659 } 2660} 2661 2662void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2663 if (!RecordD) return; 2664 AdjustDeclIfTemplate(RecordD); 2665 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2666 PushDeclContext(S, Record); 2667} 2668 2669void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2670 if (!RecordD) return; 2671 PopDeclContext(); 2672} 2673 2674/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2675/// parsing a top-level (non-nested) C++ class, and we are now 2676/// parsing those parts of the given Method declaration that could 2677/// not be parsed earlier (C++ [class.mem]p2), such as default 2678/// arguments. This action should enter the scope of the given 2679/// Method declaration as if we had just parsed the qualified method 2680/// name. However, it should not bring the parameters into scope; 2681/// that will be performed by ActOnDelayedCXXMethodParameter. 2682void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2683} 2684 2685/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2686/// C++ method declaration. We're (re-)introducing the given 2687/// function parameter into scope for use in parsing later parts of 2688/// the method declaration. For example, we could see an 2689/// ActOnParamDefaultArgument event for this parameter. 2690void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2691 if (!ParamD) 2692 return; 2693 2694 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2695 2696 // If this parameter has an unparsed default argument, clear it out 2697 // to make way for the parsed default argument. 2698 if (Param->hasUnparsedDefaultArg()) 2699 Param->setDefaultArg(0); 2700 2701 S->AddDecl(DeclPtrTy::make(Param)); 2702 if (Param->getDeclName()) 2703 IdResolver.AddDecl(Param); 2704} 2705 2706/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2707/// processing the delayed method declaration for Method. The method 2708/// declaration is now considered finished. There may be a separate 2709/// ActOnStartOfFunctionDef action later (not necessarily 2710/// immediately!) for this method, if it was also defined inside the 2711/// class body. 2712void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2713 if (!MethodD) 2714 return; 2715 2716 AdjustDeclIfTemplate(MethodD); 2717 2718 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2719 2720 // Now that we have our default arguments, check the constructor 2721 // again. It could produce additional diagnostics or affect whether 2722 // the class has implicitly-declared destructors, among other 2723 // things. 2724 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2725 CheckConstructor(Constructor); 2726 2727 // Check the default arguments, which we may have added. 2728 if (!Method->isInvalidDecl()) 2729 CheckCXXDefaultArguments(Method); 2730} 2731 2732/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2733/// the well-formedness of the constructor declarator @p D with type @p 2734/// R. If there are any errors in the declarator, this routine will 2735/// emit diagnostics and set the invalid bit to true. In any case, the type 2736/// will be updated to reflect a well-formed type for the constructor and 2737/// returned. 2738QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2739 FunctionDecl::StorageClass &SC) { 2740 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2741 2742 // C++ [class.ctor]p3: 2743 // A constructor shall not be virtual (10.3) or static (9.4). A 2744 // constructor can be invoked for a const, volatile or const 2745 // volatile object. A constructor shall not be declared const, 2746 // volatile, or const volatile (9.3.2). 2747 if (isVirtual) { 2748 if (!D.isInvalidType()) 2749 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2750 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2751 << SourceRange(D.getIdentifierLoc()); 2752 D.setInvalidType(); 2753 } 2754 if (SC == FunctionDecl::Static) { 2755 if (!D.isInvalidType()) 2756 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2757 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2758 << SourceRange(D.getIdentifierLoc()); 2759 D.setInvalidType(); 2760 SC = FunctionDecl::None; 2761 } 2762 2763 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2764 if (FTI.TypeQuals != 0) { 2765 if (FTI.TypeQuals & Qualifiers::Const) 2766 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2767 << "const" << SourceRange(D.getIdentifierLoc()); 2768 if (FTI.TypeQuals & Qualifiers::Volatile) 2769 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2770 << "volatile" << SourceRange(D.getIdentifierLoc()); 2771 if (FTI.TypeQuals & Qualifiers::Restrict) 2772 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2773 << "restrict" << SourceRange(D.getIdentifierLoc()); 2774 } 2775 2776 // Rebuild the function type "R" without any type qualifiers (in 2777 // case any of the errors above fired) and with "void" as the 2778 // return type, since constructors don't have return types. We 2779 // *always* have to do this, because GetTypeForDeclarator will 2780 // put in a result type of "int" when none was specified. 2781 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2782 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2783 Proto->getNumArgs(), 2784 Proto->isVariadic(), 0, 2785 Proto->hasExceptionSpec(), 2786 Proto->hasAnyExceptionSpec(), 2787 Proto->getNumExceptions(), 2788 Proto->exception_begin(), 2789 Proto->getExtInfo()); 2790} 2791 2792/// CheckConstructor - Checks a fully-formed constructor for 2793/// well-formedness, issuing any diagnostics required. Returns true if 2794/// the constructor declarator is invalid. 2795void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2796 CXXRecordDecl *ClassDecl 2797 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2798 if (!ClassDecl) 2799 return Constructor->setInvalidDecl(); 2800 2801 // C++ [class.copy]p3: 2802 // A declaration of a constructor for a class X is ill-formed if 2803 // its first parameter is of type (optionally cv-qualified) X and 2804 // either there are no other parameters or else all other 2805 // parameters have default arguments. 2806 if (!Constructor->isInvalidDecl() && 2807 ((Constructor->getNumParams() == 1) || 2808 (Constructor->getNumParams() > 1 && 2809 Constructor->getParamDecl(1)->hasDefaultArg())) && 2810 Constructor->getTemplateSpecializationKind() 2811 != TSK_ImplicitInstantiation) { 2812 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2813 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2814 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2815 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2816 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2817 << FixItHint::CreateInsertion(ParamLoc, " const &"); 2818 2819 // FIXME: Rather that making the constructor invalid, we should endeavor 2820 // to fix the type. 2821 Constructor->setInvalidDecl(); 2822 } 2823 } 2824 2825 // Notify the class that we've added a constructor. In principle we 2826 // don't need to do this for out-of-line declarations; in practice 2827 // we only instantiate the most recent declaration of a method, so 2828 // we have to call this for everything but friends. 2829 if (!Constructor->getFriendObjectKind()) 2830 ClassDecl->addedConstructor(Context, Constructor); 2831} 2832 2833/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2834/// issuing any diagnostics required. Returns true on error. 2835bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2836 CXXRecordDecl *RD = Destructor->getParent(); 2837 2838 if (Destructor->isVirtual()) { 2839 SourceLocation Loc; 2840 2841 if (!Destructor->isImplicit()) 2842 Loc = Destructor->getLocation(); 2843 else 2844 Loc = RD->getLocation(); 2845 2846 // If we have a virtual destructor, look up the deallocation function 2847 FunctionDecl *OperatorDelete = 0; 2848 DeclarationName Name = 2849 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2850 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2851 return true; 2852 2853 Destructor->setOperatorDelete(OperatorDelete); 2854 } 2855 2856 return false; 2857} 2858 2859static inline bool 2860FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2861 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2862 FTI.ArgInfo[0].Param && 2863 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2864} 2865 2866/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2867/// the well-formednes of the destructor declarator @p D with type @p 2868/// R. If there are any errors in the declarator, this routine will 2869/// emit diagnostics and set the declarator to invalid. Even if this happens, 2870/// will be updated to reflect a well-formed type for the destructor and 2871/// returned. 2872QualType Sema::CheckDestructorDeclarator(Declarator &D, 2873 FunctionDecl::StorageClass& SC) { 2874 // C++ [class.dtor]p1: 2875 // [...] A typedef-name that names a class is a class-name 2876 // (7.1.3); however, a typedef-name that names a class shall not 2877 // be used as the identifier in the declarator for a destructor 2878 // declaration. 2879 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2880 if (isa<TypedefType>(DeclaratorType)) { 2881 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2882 << DeclaratorType; 2883 D.setInvalidType(); 2884 } 2885 2886 // C++ [class.dtor]p2: 2887 // A destructor is used to destroy objects of its class type. A 2888 // destructor takes no parameters, and no return type can be 2889 // specified for it (not even void). The address of a destructor 2890 // shall not be taken. A destructor shall not be static. A 2891 // destructor can be invoked for a const, volatile or const 2892 // volatile object. A destructor shall not be declared const, 2893 // volatile or const volatile (9.3.2). 2894 if (SC == FunctionDecl::Static) { 2895 if (!D.isInvalidType()) 2896 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2897 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2898 << SourceRange(D.getIdentifierLoc()); 2899 SC = FunctionDecl::None; 2900 D.setInvalidType(); 2901 } 2902 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2903 // Destructors don't have return types, but the parser will 2904 // happily parse something like: 2905 // 2906 // class X { 2907 // float ~X(); 2908 // }; 2909 // 2910 // The return type will be eliminated later. 2911 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2912 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2913 << SourceRange(D.getIdentifierLoc()); 2914 } 2915 2916 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2917 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2918 if (FTI.TypeQuals & Qualifiers::Const) 2919 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2920 << "const" << SourceRange(D.getIdentifierLoc()); 2921 if (FTI.TypeQuals & Qualifiers::Volatile) 2922 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2923 << "volatile" << SourceRange(D.getIdentifierLoc()); 2924 if (FTI.TypeQuals & Qualifiers::Restrict) 2925 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2926 << "restrict" << SourceRange(D.getIdentifierLoc()); 2927 D.setInvalidType(); 2928 } 2929 2930 // Make sure we don't have any parameters. 2931 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2932 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2933 2934 // Delete the parameters. 2935 FTI.freeArgs(); 2936 D.setInvalidType(); 2937 } 2938 2939 // Make sure the destructor isn't variadic. 2940 if (FTI.isVariadic) { 2941 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2942 D.setInvalidType(); 2943 } 2944 2945 // Rebuild the function type "R" without any type qualifiers or 2946 // parameters (in case any of the errors above fired) and with 2947 // "void" as the return type, since destructors don't have return 2948 // types. We *always* have to do this, because GetTypeForDeclarator 2949 // will put in a result type of "int" when none was specified. 2950 // FIXME: Exceptions! 2951 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 2952 false, false, 0, 0, FunctionType::ExtInfo()); 2953} 2954 2955/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2956/// well-formednes of the conversion function declarator @p D with 2957/// type @p R. If there are any errors in the declarator, this routine 2958/// will emit diagnostics and return true. Otherwise, it will return 2959/// false. Either way, the type @p R will be updated to reflect a 2960/// well-formed type for the conversion operator. 2961void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2962 FunctionDecl::StorageClass& SC) { 2963 // C++ [class.conv.fct]p1: 2964 // Neither parameter types nor return type can be specified. The 2965 // type of a conversion function (8.3.5) is "function taking no 2966 // parameter returning conversion-type-id." 2967 if (SC == FunctionDecl::Static) { 2968 if (!D.isInvalidType()) 2969 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2970 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2971 << SourceRange(D.getIdentifierLoc()); 2972 D.setInvalidType(); 2973 SC = FunctionDecl::None; 2974 } 2975 2976 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2977 2978 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2979 // Conversion functions don't have return types, but the parser will 2980 // happily parse something like: 2981 // 2982 // class X { 2983 // float operator bool(); 2984 // }; 2985 // 2986 // The return type will be changed later anyway. 2987 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2988 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2989 << SourceRange(D.getIdentifierLoc()); 2990 D.setInvalidType(); 2991 } 2992 2993 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2994 2995 // Make sure we don't have any parameters. 2996 if (Proto->getNumArgs() > 0) { 2997 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2998 2999 // Delete the parameters. 3000 D.getTypeObject(0).Fun.freeArgs(); 3001 D.setInvalidType(); 3002 } else if (Proto->isVariadic()) { 3003 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3004 D.setInvalidType(); 3005 } 3006 3007 // Diagnose "&operator bool()" and other such nonsense. This 3008 // is actually a gcc extension which we don't support. 3009 if (Proto->getResultType() != ConvType) { 3010 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3011 << Proto->getResultType(); 3012 D.setInvalidType(); 3013 ConvType = Proto->getResultType(); 3014 } 3015 3016 // C++ [class.conv.fct]p4: 3017 // The conversion-type-id shall not represent a function type nor 3018 // an array type. 3019 if (ConvType->isArrayType()) { 3020 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3021 ConvType = Context.getPointerType(ConvType); 3022 D.setInvalidType(); 3023 } else if (ConvType->isFunctionType()) { 3024 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3025 ConvType = Context.getPointerType(ConvType); 3026 D.setInvalidType(); 3027 } 3028 3029 // Rebuild the function type "R" without any parameters (in case any 3030 // of the errors above fired) and with the conversion type as the 3031 // return type. 3032 if (D.isInvalidType()) { 3033 R = Context.getFunctionType(ConvType, 0, 0, false, 3034 Proto->getTypeQuals(), 3035 Proto->hasExceptionSpec(), 3036 Proto->hasAnyExceptionSpec(), 3037 Proto->getNumExceptions(), 3038 Proto->exception_begin(), 3039 Proto->getExtInfo()); 3040 } 3041 3042 // C++0x explicit conversion operators. 3043 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3044 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3045 diag::warn_explicit_conversion_functions) 3046 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3047} 3048 3049/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3050/// the declaration of the given C++ conversion function. This routine 3051/// is responsible for recording the conversion function in the C++ 3052/// class, if possible. 3053Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3054 assert(Conversion && "Expected to receive a conversion function declaration"); 3055 3056 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3057 3058 // Make sure we aren't redeclaring the conversion function. 3059 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3060 3061 // C++ [class.conv.fct]p1: 3062 // [...] A conversion function is never used to convert a 3063 // (possibly cv-qualified) object to the (possibly cv-qualified) 3064 // same object type (or a reference to it), to a (possibly 3065 // cv-qualified) base class of that type (or a reference to it), 3066 // or to (possibly cv-qualified) void. 3067 // FIXME: Suppress this warning if the conversion function ends up being a 3068 // virtual function that overrides a virtual function in a base class. 3069 QualType ClassType 3070 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3071 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3072 ConvType = ConvTypeRef->getPointeeType(); 3073 if (ConvType->isRecordType()) { 3074 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3075 if (ConvType == ClassType) 3076 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3077 << ClassType; 3078 else if (IsDerivedFrom(ClassType, ConvType)) 3079 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3080 << ClassType << ConvType; 3081 } else if (ConvType->isVoidType()) { 3082 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3083 << ClassType << ConvType; 3084 } 3085 3086 if (Conversion->getPrimaryTemplate()) { 3087 // ignore specializations 3088 } else if (Conversion->getPreviousDeclaration()) { 3089 if (FunctionTemplateDecl *ConversionTemplate 3090 = Conversion->getDescribedFunctionTemplate()) { 3091 if (ClassDecl->replaceConversion( 3092 ConversionTemplate->getPreviousDeclaration(), 3093 ConversionTemplate)) 3094 return DeclPtrTy::make(ConversionTemplate); 3095 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3096 Conversion)) 3097 return DeclPtrTy::make(Conversion); 3098 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3099 } else if (FunctionTemplateDecl *ConversionTemplate 3100 = Conversion->getDescribedFunctionTemplate()) 3101 ClassDecl->addConversionFunction(ConversionTemplate); 3102 else 3103 ClassDecl->addConversionFunction(Conversion); 3104 3105 return DeclPtrTy::make(Conversion); 3106} 3107 3108//===----------------------------------------------------------------------===// 3109// Namespace Handling 3110//===----------------------------------------------------------------------===// 3111 3112/// ActOnStartNamespaceDef - This is called at the start of a namespace 3113/// definition. 3114Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3115 SourceLocation IdentLoc, 3116 IdentifierInfo *II, 3117 SourceLocation LBrace, 3118 AttributeList *AttrList) { 3119 NamespaceDecl *Namespc = 3120 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3121 Namespc->setLBracLoc(LBrace); 3122 3123 Scope *DeclRegionScope = NamespcScope->getParent(); 3124 3125 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3126 3127 if (II) { 3128 // C++ [namespace.def]p2: 3129 // The identifier in an original-namespace-definition shall not have been 3130 // previously defined in the declarative region in which the 3131 // original-namespace-definition appears. The identifier in an 3132 // original-namespace-definition is the name of the namespace. Subsequently 3133 // in that declarative region, it is treated as an original-namespace-name. 3134 3135 NamedDecl *PrevDecl 3136 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3137 ForRedeclaration); 3138 3139 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3140 // This is an extended namespace definition. 3141 // Attach this namespace decl to the chain of extended namespace 3142 // definitions. 3143 OrigNS->setNextNamespace(Namespc); 3144 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3145 3146 // Remove the previous declaration from the scope. 3147 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3148 IdResolver.RemoveDecl(OrigNS); 3149 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3150 } 3151 } else if (PrevDecl) { 3152 // This is an invalid name redefinition. 3153 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3154 << Namespc->getDeclName(); 3155 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3156 Namespc->setInvalidDecl(); 3157 // Continue on to push Namespc as current DeclContext and return it. 3158 } else if (II->isStr("std") && 3159 CurContext->getLookupContext()->isTranslationUnit()) { 3160 // This is the first "real" definition of the namespace "std", so update 3161 // our cache of the "std" namespace to point at this definition. 3162 if (StdNamespace) { 3163 // We had already defined a dummy namespace "std". Link this new 3164 // namespace definition to the dummy namespace "std". 3165 StdNamespace->setNextNamespace(Namespc); 3166 StdNamespace->setLocation(IdentLoc); 3167 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 3168 } 3169 3170 // Make our StdNamespace cache point at the first real definition of the 3171 // "std" namespace. 3172 StdNamespace = Namespc; 3173 } 3174 3175 PushOnScopeChains(Namespc, DeclRegionScope); 3176 } else { 3177 // Anonymous namespaces. 3178 assert(Namespc->isAnonymousNamespace()); 3179 3180 // Link the anonymous namespace into its parent. 3181 NamespaceDecl *PrevDecl; 3182 DeclContext *Parent = CurContext->getLookupContext(); 3183 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3184 PrevDecl = TU->getAnonymousNamespace(); 3185 TU->setAnonymousNamespace(Namespc); 3186 } else { 3187 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3188 PrevDecl = ND->getAnonymousNamespace(); 3189 ND->setAnonymousNamespace(Namespc); 3190 } 3191 3192 // Link the anonymous namespace with its previous declaration. 3193 if (PrevDecl) { 3194 assert(PrevDecl->isAnonymousNamespace()); 3195 assert(!PrevDecl->getNextNamespace()); 3196 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3197 PrevDecl->setNextNamespace(Namespc); 3198 } 3199 3200 CurContext->addDecl(Namespc); 3201 3202 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3203 // behaves as if it were replaced by 3204 // namespace unique { /* empty body */ } 3205 // using namespace unique; 3206 // namespace unique { namespace-body } 3207 // where all occurrences of 'unique' in a translation unit are 3208 // replaced by the same identifier and this identifier differs 3209 // from all other identifiers in the entire program. 3210 3211 // We just create the namespace with an empty name and then add an 3212 // implicit using declaration, just like the standard suggests. 3213 // 3214 // CodeGen enforces the "universally unique" aspect by giving all 3215 // declarations semantically contained within an anonymous 3216 // namespace internal linkage. 3217 3218 if (!PrevDecl) { 3219 UsingDirectiveDecl* UD 3220 = UsingDirectiveDecl::Create(Context, CurContext, 3221 /* 'using' */ LBrace, 3222 /* 'namespace' */ SourceLocation(), 3223 /* qualifier */ SourceRange(), 3224 /* NNS */ NULL, 3225 /* identifier */ SourceLocation(), 3226 Namespc, 3227 /* Ancestor */ CurContext); 3228 UD->setImplicit(); 3229 CurContext->addDecl(UD); 3230 } 3231 } 3232 3233 // Although we could have an invalid decl (i.e. the namespace name is a 3234 // redefinition), push it as current DeclContext and try to continue parsing. 3235 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3236 // for the namespace has the declarations that showed up in that particular 3237 // namespace definition. 3238 PushDeclContext(NamespcScope, Namespc); 3239 return DeclPtrTy::make(Namespc); 3240} 3241 3242/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3243/// is a namespace alias, returns the namespace it points to. 3244static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3245 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3246 return AD->getNamespace(); 3247 return dyn_cast_or_null<NamespaceDecl>(D); 3248} 3249 3250/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3251/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3252void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3253 Decl *Dcl = D.getAs<Decl>(); 3254 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3255 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3256 Namespc->setRBracLoc(RBrace); 3257 PopDeclContext(); 3258} 3259 3260Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3261 SourceLocation UsingLoc, 3262 SourceLocation NamespcLoc, 3263 CXXScopeSpec &SS, 3264 SourceLocation IdentLoc, 3265 IdentifierInfo *NamespcName, 3266 AttributeList *AttrList) { 3267 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3268 assert(NamespcName && "Invalid NamespcName."); 3269 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3270 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3271 3272 UsingDirectiveDecl *UDir = 0; 3273 3274 // Lookup namespace name. 3275 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3276 LookupParsedName(R, S, &SS); 3277 if (R.isAmbiguous()) 3278 return DeclPtrTy(); 3279 3280 if (!R.empty()) { 3281 NamedDecl *Named = R.getFoundDecl(); 3282 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3283 && "expected namespace decl"); 3284 // C++ [namespace.udir]p1: 3285 // A using-directive specifies that the names in the nominated 3286 // namespace can be used in the scope in which the 3287 // using-directive appears after the using-directive. During 3288 // unqualified name lookup (3.4.1), the names appear as if they 3289 // were declared in the nearest enclosing namespace which 3290 // contains both the using-directive and the nominated 3291 // namespace. [Note: in this context, "contains" means "contains 3292 // directly or indirectly". ] 3293 3294 // Find enclosing context containing both using-directive and 3295 // nominated namespace. 3296 NamespaceDecl *NS = getNamespaceDecl(Named); 3297 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3298 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3299 CommonAncestor = CommonAncestor->getParent(); 3300 3301 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3302 SS.getRange(), 3303 (NestedNameSpecifier *)SS.getScopeRep(), 3304 IdentLoc, Named, CommonAncestor); 3305 PushUsingDirective(S, UDir); 3306 } else { 3307 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3308 } 3309 3310 // FIXME: We ignore attributes for now. 3311 delete AttrList; 3312 return DeclPtrTy::make(UDir); 3313} 3314 3315void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3316 // If scope has associated entity, then using directive is at namespace 3317 // or translation unit scope. We add UsingDirectiveDecls, into 3318 // it's lookup structure. 3319 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3320 Ctx->addDecl(UDir); 3321 else 3322 // Otherwise it is block-sope. using-directives will affect lookup 3323 // only to the end of scope. 3324 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3325} 3326 3327 3328Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3329 AccessSpecifier AS, 3330 bool HasUsingKeyword, 3331 SourceLocation UsingLoc, 3332 CXXScopeSpec &SS, 3333 UnqualifiedId &Name, 3334 AttributeList *AttrList, 3335 bool IsTypeName, 3336 SourceLocation TypenameLoc) { 3337 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3338 3339 switch (Name.getKind()) { 3340 case UnqualifiedId::IK_Identifier: 3341 case UnqualifiedId::IK_OperatorFunctionId: 3342 case UnqualifiedId::IK_LiteralOperatorId: 3343 case UnqualifiedId::IK_ConversionFunctionId: 3344 break; 3345 3346 case UnqualifiedId::IK_ConstructorName: 3347 case UnqualifiedId::IK_ConstructorTemplateId: 3348 // C++0x inherited constructors. 3349 if (getLangOptions().CPlusPlus0x) break; 3350 3351 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3352 << SS.getRange(); 3353 return DeclPtrTy(); 3354 3355 case UnqualifiedId::IK_DestructorName: 3356 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3357 << SS.getRange(); 3358 return DeclPtrTy(); 3359 3360 case UnqualifiedId::IK_TemplateId: 3361 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3362 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3363 return DeclPtrTy(); 3364 } 3365 3366 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3367 if (!TargetName) 3368 return DeclPtrTy(); 3369 3370 // Warn about using declarations. 3371 // TODO: store that the declaration was written without 'using' and 3372 // talk about access decls instead of using decls in the 3373 // diagnostics. 3374 if (!HasUsingKeyword) { 3375 UsingLoc = Name.getSourceRange().getBegin(); 3376 3377 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3378 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3379 } 3380 3381 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3382 Name.getSourceRange().getBegin(), 3383 TargetName, AttrList, 3384 /* IsInstantiation */ false, 3385 IsTypeName, TypenameLoc); 3386 if (UD) 3387 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3388 3389 return DeclPtrTy::make(UD); 3390} 3391 3392/// Determines whether to create a using shadow decl for a particular 3393/// decl, given the set of decls existing prior to this using lookup. 3394bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3395 const LookupResult &Previous) { 3396 // Diagnose finding a decl which is not from a base class of the 3397 // current class. We do this now because there are cases where this 3398 // function will silently decide not to build a shadow decl, which 3399 // will pre-empt further diagnostics. 3400 // 3401 // We don't need to do this in C++0x because we do the check once on 3402 // the qualifier. 3403 // 3404 // FIXME: diagnose the following if we care enough: 3405 // struct A { int foo; }; 3406 // struct B : A { using A::foo; }; 3407 // template <class T> struct C : A {}; 3408 // template <class T> struct D : C<T> { using B::foo; } // <--- 3409 // This is invalid (during instantiation) in C++03 because B::foo 3410 // resolves to the using decl in B, which is not a base class of D<T>. 3411 // We can't diagnose it immediately because C<T> is an unknown 3412 // specialization. The UsingShadowDecl in D<T> then points directly 3413 // to A::foo, which will look well-formed when we instantiate. 3414 // The right solution is to not collapse the shadow-decl chain. 3415 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3416 DeclContext *OrigDC = Orig->getDeclContext(); 3417 3418 // Handle enums and anonymous structs. 3419 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3420 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3421 while (OrigRec->isAnonymousStructOrUnion()) 3422 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3423 3424 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3425 if (OrigDC == CurContext) { 3426 Diag(Using->getLocation(), 3427 diag::err_using_decl_nested_name_specifier_is_current_class) 3428 << Using->getNestedNameRange(); 3429 Diag(Orig->getLocation(), diag::note_using_decl_target); 3430 return true; 3431 } 3432 3433 Diag(Using->getNestedNameRange().getBegin(), 3434 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3435 << Using->getTargetNestedNameDecl() 3436 << cast<CXXRecordDecl>(CurContext) 3437 << Using->getNestedNameRange(); 3438 Diag(Orig->getLocation(), diag::note_using_decl_target); 3439 return true; 3440 } 3441 } 3442 3443 if (Previous.empty()) return false; 3444 3445 NamedDecl *Target = Orig; 3446 if (isa<UsingShadowDecl>(Target)) 3447 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3448 3449 // If the target happens to be one of the previous declarations, we 3450 // don't have a conflict. 3451 // 3452 // FIXME: but we might be increasing its access, in which case we 3453 // should redeclare it. 3454 NamedDecl *NonTag = 0, *Tag = 0; 3455 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3456 I != E; ++I) { 3457 NamedDecl *D = (*I)->getUnderlyingDecl(); 3458 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3459 return false; 3460 3461 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3462 } 3463 3464 if (Target->isFunctionOrFunctionTemplate()) { 3465 FunctionDecl *FD; 3466 if (isa<FunctionTemplateDecl>(Target)) 3467 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3468 else 3469 FD = cast<FunctionDecl>(Target); 3470 3471 NamedDecl *OldDecl = 0; 3472 switch (CheckOverload(FD, Previous, OldDecl)) { 3473 case Ovl_Overload: 3474 return false; 3475 3476 case Ovl_NonFunction: 3477 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3478 break; 3479 3480 // We found a decl with the exact signature. 3481 case Ovl_Match: 3482 if (isa<UsingShadowDecl>(OldDecl)) { 3483 // Silently ignore the possible conflict. 3484 return false; 3485 } 3486 3487 // If we're in a record, we want to hide the target, so we 3488 // return true (without a diagnostic) to tell the caller not to 3489 // build a shadow decl. 3490 if (CurContext->isRecord()) 3491 return true; 3492 3493 // If we're not in a record, this is an error. 3494 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3495 break; 3496 } 3497 3498 Diag(Target->getLocation(), diag::note_using_decl_target); 3499 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3500 return true; 3501 } 3502 3503 // Target is not a function. 3504 3505 if (isa<TagDecl>(Target)) { 3506 // No conflict between a tag and a non-tag. 3507 if (!Tag) return false; 3508 3509 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3510 Diag(Target->getLocation(), diag::note_using_decl_target); 3511 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3512 return true; 3513 } 3514 3515 // No conflict between a tag and a non-tag. 3516 if (!NonTag) return false; 3517 3518 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3519 Diag(Target->getLocation(), diag::note_using_decl_target); 3520 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3521 return true; 3522} 3523 3524/// Builds a shadow declaration corresponding to a 'using' declaration. 3525UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3526 UsingDecl *UD, 3527 NamedDecl *Orig) { 3528 3529 // If we resolved to another shadow declaration, just coalesce them. 3530 NamedDecl *Target = Orig; 3531 if (isa<UsingShadowDecl>(Target)) { 3532 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3533 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3534 } 3535 3536 UsingShadowDecl *Shadow 3537 = UsingShadowDecl::Create(Context, CurContext, 3538 UD->getLocation(), UD, Target); 3539 UD->addShadowDecl(Shadow); 3540 3541 if (S) 3542 PushOnScopeChains(Shadow, S); 3543 else 3544 CurContext->addDecl(Shadow); 3545 Shadow->setAccess(UD->getAccess()); 3546 3547 // Register it as a conversion if appropriate. 3548 if (Shadow->getDeclName().getNameKind() 3549 == DeclarationName::CXXConversionFunctionName) 3550 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3551 3552 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3553 Shadow->setInvalidDecl(); 3554 3555 return Shadow; 3556} 3557 3558/// Hides a using shadow declaration. This is required by the current 3559/// using-decl implementation when a resolvable using declaration in a 3560/// class is followed by a declaration which would hide or override 3561/// one or more of the using decl's targets; for example: 3562/// 3563/// struct Base { void foo(int); }; 3564/// struct Derived : Base { 3565/// using Base::foo; 3566/// void foo(int); 3567/// }; 3568/// 3569/// The governing language is C++03 [namespace.udecl]p12: 3570/// 3571/// When a using-declaration brings names from a base class into a 3572/// derived class scope, member functions in the derived class 3573/// override and/or hide member functions with the same name and 3574/// parameter types in a base class (rather than conflicting). 3575/// 3576/// There are two ways to implement this: 3577/// (1) optimistically create shadow decls when they're not hidden 3578/// by existing declarations, or 3579/// (2) don't create any shadow decls (or at least don't make them 3580/// visible) until we've fully parsed/instantiated the class. 3581/// The problem with (1) is that we might have to retroactively remove 3582/// a shadow decl, which requires several O(n) operations because the 3583/// decl structures are (very reasonably) not designed for removal. 3584/// (2) avoids this but is very fiddly and phase-dependent. 3585void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3586 if (Shadow->getDeclName().getNameKind() == 3587 DeclarationName::CXXConversionFunctionName) 3588 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3589 3590 // Remove it from the DeclContext... 3591 Shadow->getDeclContext()->removeDecl(Shadow); 3592 3593 // ...and the scope, if applicable... 3594 if (S) { 3595 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3596 IdResolver.RemoveDecl(Shadow); 3597 } 3598 3599 // ...and the using decl. 3600 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3601 3602 // TODO: complain somehow if Shadow was used. It shouldn't 3603 // be possible for this to happen, because...? 3604} 3605 3606/// Builds a using declaration. 3607/// 3608/// \param IsInstantiation - Whether this call arises from an 3609/// instantiation of an unresolved using declaration. We treat 3610/// the lookup differently for these declarations. 3611NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3612 SourceLocation UsingLoc, 3613 CXXScopeSpec &SS, 3614 SourceLocation IdentLoc, 3615 DeclarationName Name, 3616 AttributeList *AttrList, 3617 bool IsInstantiation, 3618 bool IsTypeName, 3619 SourceLocation TypenameLoc) { 3620 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3621 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3622 3623 // FIXME: We ignore attributes for now. 3624 delete AttrList; 3625 3626 if (SS.isEmpty()) { 3627 Diag(IdentLoc, diag::err_using_requires_qualname); 3628 return 0; 3629 } 3630 3631 // Do the redeclaration lookup in the current scope. 3632 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3633 ForRedeclaration); 3634 Previous.setHideTags(false); 3635 if (S) { 3636 LookupName(Previous, S); 3637 3638 // It is really dumb that we have to do this. 3639 LookupResult::Filter F = Previous.makeFilter(); 3640 while (F.hasNext()) { 3641 NamedDecl *D = F.next(); 3642 if (!isDeclInScope(D, CurContext, S)) 3643 F.erase(); 3644 } 3645 F.done(); 3646 } else { 3647 assert(IsInstantiation && "no scope in non-instantiation"); 3648 assert(CurContext->isRecord() && "scope not record in instantiation"); 3649 LookupQualifiedName(Previous, CurContext); 3650 } 3651 3652 NestedNameSpecifier *NNS = 3653 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3654 3655 // Check for invalid redeclarations. 3656 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3657 return 0; 3658 3659 // Check for bad qualifiers. 3660 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3661 return 0; 3662 3663 DeclContext *LookupContext = computeDeclContext(SS); 3664 NamedDecl *D; 3665 if (!LookupContext) { 3666 if (IsTypeName) { 3667 // FIXME: not all declaration name kinds are legal here 3668 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3669 UsingLoc, TypenameLoc, 3670 SS.getRange(), NNS, 3671 IdentLoc, Name); 3672 } else { 3673 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3674 UsingLoc, SS.getRange(), NNS, 3675 IdentLoc, Name); 3676 } 3677 } else { 3678 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3679 SS.getRange(), UsingLoc, NNS, Name, 3680 IsTypeName); 3681 } 3682 D->setAccess(AS); 3683 CurContext->addDecl(D); 3684 3685 if (!LookupContext) return D; 3686 UsingDecl *UD = cast<UsingDecl>(D); 3687 3688 if (RequireCompleteDeclContext(SS)) { 3689 UD->setInvalidDecl(); 3690 return UD; 3691 } 3692 3693 // Look up the target name. 3694 3695 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3696 3697 // Unlike most lookups, we don't always want to hide tag 3698 // declarations: tag names are visible through the using declaration 3699 // even if hidden by ordinary names, *except* in a dependent context 3700 // where it's important for the sanity of two-phase lookup. 3701 if (!IsInstantiation) 3702 R.setHideTags(false); 3703 3704 LookupQualifiedName(R, LookupContext); 3705 3706 if (R.empty()) { 3707 Diag(IdentLoc, diag::err_no_member) 3708 << Name << LookupContext << SS.getRange(); 3709 UD->setInvalidDecl(); 3710 return UD; 3711 } 3712 3713 if (R.isAmbiguous()) { 3714 UD->setInvalidDecl(); 3715 return UD; 3716 } 3717 3718 if (IsTypeName) { 3719 // If we asked for a typename and got a non-type decl, error out. 3720 if (!R.getAsSingle<TypeDecl>()) { 3721 Diag(IdentLoc, diag::err_using_typename_non_type); 3722 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3723 Diag((*I)->getUnderlyingDecl()->getLocation(), 3724 diag::note_using_decl_target); 3725 UD->setInvalidDecl(); 3726 return UD; 3727 } 3728 } else { 3729 // If we asked for a non-typename and we got a type, error out, 3730 // but only if this is an instantiation of an unresolved using 3731 // decl. Otherwise just silently find the type name. 3732 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3733 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3734 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3735 UD->setInvalidDecl(); 3736 return UD; 3737 } 3738 } 3739 3740 // C++0x N2914 [namespace.udecl]p6: 3741 // A using-declaration shall not name a namespace. 3742 if (R.getAsSingle<NamespaceDecl>()) { 3743 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3744 << SS.getRange(); 3745 UD->setInvalidDecl(); 3746 return UD; 3747 } 3748 3749 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3750 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3751 BuildUsingShadowDecl(S, UD, *I); 3752 } 3753 3754 return UD; 3755} 3756 3757/// Checks that the given using declaration is not an invalid 3758/// redeclaration. Note that this is checking only for the using decl 3759/// itself, not for any ill-formedness among the UsingShadowDecls. 3760bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3761 bool isTypeName, 3762 const CXXScopeSpec &SS, 3763 SourceLocation NameLoc, 3764 const LookupResult &Prev) { 3765 // C++03 [namespace.udecl]p8: 3766 // C++0x [namespace.udecl]p10: 3767 // A using-declaration is a declaration and can therefore be used 3768 // repeatedly where (and only where) multiple declarations are 3769 // allowed. 3770 // That's only in file contexts. 3771 if (CurContext->getLookupContext()->isFileContext()) 3772 return false; 3773 3774 NestedNameSpecifier *Qual 3775 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3776 3777 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3778 NamedDecl *D = *I; 3779 3780 bool DTypename; 3781 NestedNameSpecifier *DQual; 3782 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3783 DTypename = UD->isTypeName(); 3784 DQual = UD->getTargetNestedNameDecl(); 3785 } else if (UnresolvedUsingValueDecl *UD 3786 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3787 DTypename = false; 3788 DQual = UD->getTargetNestedNameSpecifier(); 3789 } else if (UnresolvedUsingTypenameDecl *UD 3790 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3791 DTypename = true; 3792 DQual = UD->getTargetNestedNameSpecifier(); 3793 } else continue; 3794 3795 // using decls differ if one says 'typename' and the other doesn't. 3796 // FIXME: non-dependent using decls? 3797 if (isTypeName != DTypename) continue; 3798 3799 // using decls differ if they name different scopes (but note that 3800 // template instantiation can cause this check to trigger when it 3801 // didn't before instantiation). 3802 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3803 Context.getCanonicalNestedNameSpecifier(DQual)) 3804 continue; 3805 3806 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3807 Diag(D->getLocation(), diag::note_using_decl) << 1; 3808 return true; 3809 } 3810 3811 return false; 3812} 3813 3814 3815/// Checks that the given nested-name qualifier used in a using decl 3816/// in the current context is appropriately related to the current 3817/// scope. If an error is found, diagnoses it and returns true. 3818bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3819 const CXXScopeSpec &SS, 3820 SourceLocation NameLoc) { 3821 DeclContext *NamedContext = computeDeclContext(SS); 3822 3823 if (!CurContext->isRecord()) { 3824 // C++03 [namespace.udecl]p3: 3825 // C++0x [namespace.udecl]p8: 3826 // A using-declaration for a class member shall be a member-declaration. 3827 3828 // If we weren't able to compute a valid scope, it must be a 3829 // dependent class scope. 3830 if (!NamedContext || NamedContext->isRecord()) { 3831 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3832 << SS.getRange(); 3833 return true; 3834 } 3835 3836 // Otherwise, everything is known to be fine. 3837 return false; 3838 } 3839 3840 // The current scope is a record. 3841 3842 // If the named context is dependent, we can't decide much. 3843 if (!NamedContext) { 3844 // FIXME: in C++0x, we can diagnose if we can prove that the 3845 // nested-name-specifier does not refer to a base class, which is 3846 // still possible in some cases. 3847 3848 // Otherwise we have to conservatively report that things might be 3849 // okay. 3850 return false; 3851 } 3852 3853 if (!NamedContext->isRecord()) { 3854 // Ideally this would point at the last name in the specifier, 3855 // but we don't have that level of source info. 3856 Diag(SS.getRange().getBegin(), 3857 diag::err_using_decl_nested_name_specifier_is_not_class) 3858 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3859 return true; 3860 } 3861 3862 if (getLangOptions().CPlusPlus0x) { 3863 // C++0x [namespace.udecl]p3: 3864 // In a using-declaration used as a member-declaration, the 3865 // nested-name-specifier shall name a base class of the class 3866 // being defined. 3867 3868 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3869 cast<CXXRecordDecl>(NamedContext))) { 3870 if (CurContext == NamedContext) { 3871 Diag(NameLoc, 3872 diag::err_using_decl_nested_name_specifier_is_current_class) 3873 << SS.getRange(); 3874 return true; 3875 } 3876 3877 Diag(SS.getRange().getBegin(), 3878 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3879 << (NestedNameSpecifier*) SS.getScopeRep() 3880 << cast<CXXRecordDecl>(CurContext) 3881 << SS.getRange(); 3882 return true; 3883 } 3884 3885 return false; 3886 } 3887 3888 // C++03 [namespace.udecl]p4: 3889 // A using-declaration used as a member-declaration shall refer 3890 // to a member of a base class of the class being defined [etc.]. 3891 3892 // Salient point: SS doesn't have to name a base class as long as 3893 // lookup only finds members from base classes. Therefore we can 3894 // diagnose here only if we can prove that that can't happen, 3895 // i.e. if the class hierarchies provably don't intersect. 3896 3897 // TODO: it would be nice if "definitely valid" results were cached 3898 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3899 // need to be repeated. 3900 3901 struct UserData { 3902 llvm::DenseSet<const CXXRecordDecl*> Bases; 3903 3904 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3905 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3906 Data->Bases.insert(Base); 3907 return true; 3908 } 3909 3910 bool hasDependentBases(const CXXRecordDecl *Class) { 3911 return !Class->forallBases(collect, this); 3912 } 3913 3914 /// Returns true if the base is dependent or is one of the 3915 /// accumulated base classes. 3916 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3917 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3918 return !Data->Bases.count(Base); 3919 } 3920 3921 bool mightShareBases(const CXXRecordDecl *Class) { 3922 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3923 } 3924 }; 3925 3926 UserData Data; 3927 3928 // Returns false if we find a dependent base. 3929 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3930 return false; 3931 3932 // Returns false if the class has a dependent base or if it or one 3933 // of its bases is present in the base set of the current context. 3934 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3935 return false; 3936 3937 Diag(SS.getRange().getBegin(), 3938 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3939 << (NestedNameSpecifier*) SS.getScopeRep() 3940 << cast<CXXRecordDecl>(CurContext) 3941 << SS.getRange(); 3942 3943 return true; 3944} 3945 3946Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3947 SourceLocation NamespaceLoc, 3948 SourceLocation AliasLoc, 3949 IdentifierInfo *Alias, 3950 CXXScopeSpec &SS, 3951 SourceLocation IdentLoc, 3952 IdentifierInfo *Ident) { 3953 3954 // Lookup the namespace name. 3955 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3956 LookupParsedName(R, S, &SS); 3957 3958 // Check if we have a previous declaration with the same name. 3959 if (NamedDecl *PrevDecl 3960 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 3961 ForRedeclaration)) { 3962 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3963 // We already have an alias with the same name that points to the same 3964 // namespace, so don't create a new one. 3965 // FIXME: At some point, we'll want to create the (redundant) 3966 // declaration to maintain better source information. 3967 if (!R.isAmbiguous() && !R.empty() && 3968 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 3969 return DeclPtrTy(); 3970 } 3971 3972 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3973 diag::err_redefinition_different_kind; 3974 Diag(AliasLoc, DiagID) << Alias; 3975 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3976 return DeclPtrTy(); 3977 } 3978 3979 if (R.isAmbiguous()) 3980 return DeclPtrTy(); 3981 3982 if (R.empty()) { 3983 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3984 return DeclPtrTy(); 3985 } 3986 3987 NamespaceAliasDecl *AliasDecl = 3988 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3989 Alias, SS.getRange(), 3990 (NestedNameSpecifier *)SS.getScopeRep(), 3991 IdentLoc, R.getFoundDecl()); 3992 3993 PushOnScopeChains(AliasDecl, S); 3994 return DeclPtrTy::make(AliasDecl); 3995} 3996 3997void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3998 CXXConstructorDecl *Constructor) { 3999 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4000 !Constructor->isUsed()) && 4001 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4002 4003 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4004 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4005 4006 DeclContext *PreviousContext = CurContext; 4007 CurContext = Constructor; 4008 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false)) { 4009 Diag(CurrentLocation, diag::note_member_synthesized_at) 4010 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4011 Constructor->setInvalidDecl(); 4012 } else { 4013 Constructor->setUsed(); 4014 } 4015 CurContext = PreviousContext; 4016} 4017 4018void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4019 CXXDestructorDecl *Destructor) { 4020 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 4021 "DefineImplicitDestructor - call it for implicit default dtor"); 4022 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4023 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4024 4025 DeclContext *PreviousContext = CurContext; 4026 CurContext = Destructor; 4027 4028 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4029 Destructor->getParent()); 4030 4031 // FIXME: If CheckDestructor fails, we should emit a note about where the 4032 // implicit destructor was needed. 4033 if (CheckDestructor(Destructor)) { 4034 Diag(CurrentLocation, diag::note_member_synthesized_at) 4035 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4036 4037 Destructor->setInvalidDecl(); 4038 CurContext = PreviousContext; 4039 4040 return; 4041 } 4042 CurContext = PreviousContext; 4043 4044 Destructor->setUsed(); 4045} 4046 4047void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 4048 CXXMethodDecl *MethodDecl) { 4049 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 4050 MethodDecl->getOverloadedOperator() == OO_Equal && 4051 !MethodDecl->isUsed()) && 4052 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 4053 4054 CXXRecordDecl *ClassDecl 4055 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 4056 4057 DeclContext *PreviousContext = CurContext; 4058 CurContext = MethodDecl; 4059 4060 // C++[class.copy] p12 4061 // Before the implicitly-declared copy assignment operator for a class is 4062 // implicitly defined, all implicitly-declared copy assignment operators 4063 // for its direct base classes and its nonstatic data members shall have 4064 // been implicitly defined. 4065 bool err = false; 4066 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4067 E = ClassDecl->bases_end(); Base != E; ++Base) { 4068 CXXRecordDecl *BaseClassDecl 4069 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4070 if (CXXMethodDecl *BaseAssignOpMethod = 4071 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 4072 BaseClassDecl)) { 4073 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 4074 BaseAssignOpMethod, 4075 PDiag(diag::err_access_assign_base) 4076 << Base->getType()); 4077 4078 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 4079 } 4080 } 4081 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4082 E = ClassDecl->field_end(); Field != E; ++Field) { 4083 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 4084 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 4085 FieldType = Array->getElementType(); 4086 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4087 CXXRecordDecl *FieldClassDecl 4088 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4089 if (CXXMethodDecl *FieldAssignOpMethod = 4090 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 4091 FieldClassDecl)) { 4092 CheckDirectMemberAccess(Field->getLocation(), 4093 FieldAssignOpMethod, 4094 PDiag(diag::err_access_assign_field) 4095 << Field->getDeclName() << Field->getType()); 4096 4097 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 4098 } 4099 } else if (FieldType->isReferenceType()) { 4100 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4101 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4102 Diag(Field->getLocation(), diag::note_declared_at); 4103 Diag(CurrentLocation, diag::note_first_required_here); 4104 err = true; 4105 } else if (FieldType.isConstQualified()) { 4106 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4107 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4108 Diag(Field->getLocation(), diag::note_declared_at); 4109 Diag(CurrentLocation, diag::note_first_required_here); 4110 err = true; 4111 } 4112 } 4113 if (!err) 4114 MethodDecl->setUsed(); 4115 4116 CurContext = PreviousContext; 4117} 4118 4119CXXMethodDecl * 4120Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 4121 ParmVarDecl *ParmDecl, 4122 CXXRecordDecl *ClassDecl) { 4123 QualType LHSType = Context.getTypeDeclType(ClassDecl); 4124 QualType RHSType(LHSType); 4125 // If class's assignment operator argument is const/volatile qualified, 4126 // look for operator = (const/volatile B&). Otherwise, look for 4127 // operator = (B&). 4128 RHSType = Context.getCVRQualifiedType(RHSType, 4129 ParmDecl->getType().getCVRQualifiers()); 4130 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 4131 LHSType, 4132 SourceLocation())); 4133 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 4134 RHSType, 4135 CurrentLocation)); 4136 Expr *Args[2] = { &*LHS, &*RHS }; 4137 OverloadCandidateSet CandidateSet(CurrentLocation); 4138 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 4139 CandidateSet); 4140 OverloadCandidateSet::iterator Best; 4141 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 4142 return cast<CXXMethodDecl>(Best->Function); 4143 assert(false && 4144 "getAssignOperatorMethod - copy assignment operator method not found"); 4145 return 0; 4146} 4147 4148void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 4149 CXXConstructorDecl *CopyConstructor, 4150 unsigned TypeQuals) { 4151 assert((CopyConstructor->isImplicit() && 4152 CopyConstructor->isCopyConstructor(TypeQuals) && 4153 !CopyConstructor->isUsed()) && 4154 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 4155 4156 CXXRecordDecl *ClassDecl 4157 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 4158 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 4159 4160 DeclContext *PreviousContext = CurContext; 4161 CurContext = CopyConstructor; 4162 4163 // C++ [class.copy] p209 4164 // Before the implicitly-declared copy constructor for a class is 4165 // implicitly defined, all the implicitly-declared copy constructors 4166 // for its base class and its non-static data members shall have been 4167 // implicitly defined. 4168 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 4169 Base != ClassDecl->bases_end(); ++Base) { 4170 CXXRecordDecl *BaseClassDecl 4171 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4172 if (CXXConstructorDecl *BaseCopyCtor = 4173 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) { 4174 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 4175 BaseCopyCtor, 4176 PDiag(diag::err_access_copy_base) 4177 << Base->getType()); 4178 4179 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 4180 } 4181 } 4182 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4183 FieldEnd = ClassDecl->field_end(); 4184 Field != FieldEnd; ++Field) { 4185 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 4186 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 4187 FieldType = Array->getElementType(); 4188 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4189 CXXRecordDecl *FieldClassDecl 4190 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4191 if (CXXConstructorDecl *FieldCopyCtor = 4192 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) { 4193 CheckDirectMemberAccess(Field->getLocation(), 4194 FieldCopyCtor, 4195 PDiag(diag::err_access_copy_field) 4196 << Field->getDeclName() << Field->getType()); 4197 4198 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 4199 } 4200 } 4201 } 4202 CopyConstructor->setUsed(); 4203 4204 CurContext = PreviousContext; 4205} 4206 4207Sema::OwningExprResult 4208Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4209 CXXConstructorDecl *Constructor, 4210 MultiExprArg ExprArgs, 4211 bool RequiresZeroInit, 4212 bool BaseInitialization) { 4213 bool Elidable = false; 4214 4215 // C++0x [class.copy]p34: 4216 // When certain criteria are met, an implementation is allowed to 4217 // omit the copy/move construction of a class object, even if the 4218 // copy/move constructor and/or destructor for the object have 4219 // side effects. [...] 4220 // - when a temporary class object that has not been bound to a 4221 // reference (12.2) would be copied/moved to a class object 4222 // with the same cv-unqualified type, the copy/move operation 4223 // can be omitted by constructing the temporary object 4224 // directly into the target of the omitted copy/move 4225 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 4226 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 4227 Elidable = SubExpr->isTemporaryObject() && 4228 Context.hasSameUnqualifiedType(SubExpr->getType(), 4229 Context.getTypeDeclType(Constructor->getParent())); 4230 } 4231 4232 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4233 Elidable, move(ExprArgs), RequiresZeroInit, 4234 BaseInitialization); 4235} 4236 4237/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4238/// including handling of its default argument expressions. 4239Sema::OwningExprResult 4240Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4241 CXXConstructorDecl *Constructor, bool Elidable, 4242 MultiExprArg ExprArgs, 4243 bool RequiresZeroInit, 4244 bool BaseInitialization) { 4245 unsigned NumExprs = ExprArgs.size(); 4246 Expr **Exprs = (Expr **)ExprArgs.release(); 4247 4248 MarkDeclarationReferenced(ConstructLoc, Constructor); 4249 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4250 Constructor, Elidable, Exprs, NumExprs, 4251 RequiresZeroInit, BaseInitialization)); 4252} 4253 4254bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4255 CXXConstructorDecl *Constructor, 4256 MultiExprArg Exprs) { 4257 OwningExprResult TempResult = 4258 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4259 move(Exprs)); 4260 if (TempResult.isInvalid()) 4261 return true; 4262 4263 Expr *Temp = TempResult.takeAs<Expr>(); 4264 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4265 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4266 VD->setInit(Temp); 4267 4268 return false; 4269} 4270 4271void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4272 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4273 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4274 !ClassDecl->hasTrivialDestructor()) { 4275 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4276 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4277 CheckDestructorAccess(VD->getLocation(), Destructor, 4278 PDiag(diag::err_access_dtor_var) 4279 << VD->getDeclName() 4280 << VD->getType()); 4281 } 4282} 4283 4284/// AddCXXDirectInitializerToDecl - This action is called immediately after 4285/// ActOnDeclarator, when a C++ direct initializer is present. 4286/// e.g: "int x(1);" 4287void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4288 SourceLocation LParenLoc, 4289 MultiExprArg Exprs, 4290 SourceLocation *CommaLocs, 4291 SourceLocation RParenLoc) { 4292 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4293 Decl *RealDecl = Dcl.getAs<Decl>(); 4294 4295 // If there is no declaration, there was an error parsing it. Just ignore 4296 // the initializer. 4297 if (RealDecl == 0) 4298 return; 4299 4300 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4301 if (!VDecl) { 4302 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4303 RealDecl->setInvalidDecl(); 4304 return; 4305 } 4306 4307 // We will represent direct-initialization similarly to copy-initialization: 4308 // int x(1); -as-> int x = 1; 4309 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4310 // 4311 // Clients that want to distinguish between the two forms, can check for 4312 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4313 // A major benefit is that clients that don't particularly care about which 4314 // exactly form was it (like the CodeGen) can handle both cases without 4315 // special case code. 4316 4317 // C++ 8.5p11: 4318 // The form of initialization (using parentheses or '=') is generally 4319 // insignificant, but does matter when the entity being initialized has a 4320 // class type. 4321 QualType DeclInitType = VDecl->getType(); 4322 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4323 DeclInitType = Context.getBaseElementType(Array); 4324 4325 if (!VDecl->getType()->isDependentType() && 4326 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4327 diag::err_typecheck_decl_incomplete_type)) { 4328 VDecl->setInvalidDecl(); 4329 return; 4330 } 4331 4332 // The variable can not have an abstract class type. 4333 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4334 diag::err_abstract_type_in_decl, 4335 AbstractVariableType)) 4336 VDecl->setInvalidDecl(); 4337 4338 const VarDecl *Def; 4339 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4340 Diag(VDecl->getLocation(), diag::err_redefinition) 4341 << VDecl->getDeclName(); 4342 Diag(Def->getLocation(), diag::note_previous_definition); 4343 VDecl->setInvalidDecl(); 4344 return; 4345 } 4346 4347 // If either the declaration has a dependent type or if any of the 4348 // expressions is type-dependent, we represent the initialization 4349 // via a ParenListExpr for later use during template instantiation. 4350 if (VDecl->getType()->isDependentType() || 4351 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4352 // Let clients know that initialization was done with a direct initializer. 4353 VDecl->setCXXDirectInitializer(true); 4354 4355 // Store the initialization expressions as a ParenListExpr. 4356 unsigned NumExprs = Exprs.size(); 4357 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4358 (Expr **)Exprs.release(), 4359 NumExprs, RParenLoc)); 4360 return; 4361 } 4362 4363 // Capture the variable that is being initialized and the style of 4364 // initialization. 4365 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4366 4367 // FIXME: Poor source location information. 4368 InitializationKind Kind 4369 = InitializationKind::CreateDirect(VDecl->getLocation(), 4370 LParenLoc, RParenLoc); 4371 4372 InitializationSequence InitSeq(*this, Entity, Kind, 4373 (Expr**)Exprs.get(), Exprs.size()); 4374 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4375 if (Result.isInvalid()) { 4376 VDecl->setInvalidDecl(); 4377 return; 4378 } 4379 4380 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4381 VDecl->setInit(Result.takeAs<Expr>()); 4382 VDecl->setCXXDirectInitializer(true); 4383 4384 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4385 FinalizeVarWithDestructor(VDecl, Record); 4386} 4387 4388/// \brief Given a constructor and the set of arguments provided for the 4389/// constructor, convert the arguments and add any required default arguments 4390/// to form a proper call to this constructor. 4391/// 4392/// \returns true if an error occurred, false otherwise. 4393bool 4394Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4395 MultiExprArg ArgsPtr, 4396 SourceLocation Loc, 4397 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4398 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4399 unsigned NumArgs = ArgsPtr.size(); 4400 Expr **Args = (Expr **)ArgsPtr.get(); 4401 4402 const FunctionProtoType *Proto 4403 = Constructor->getType()->getAs<FunctionProtoType>(); 4404 assert(Proto && "Constructor without a prototype?"); 4405 unsigned NumArgsInProto = Proto->getNumArgs(); 4406 4407 // If too few arguments are available, we'll fill in the rest with defaults. 4408 if (NumArgs < NumArgsInProto) 4409 ConvertedArgs.reserve(NumArgsInProto); 4410 else 4411 ConvertedArgs.reserve(NumArgs); 4412 4413 VariadicCallType CallType = 4414 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4415 llvm::SmallVector<Expr *, 8> AllArgs; 4416 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4417 Proto, 0, Args, NumArgs, AllArgs, 4418 CallType); 4419 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4420 ConvertedArgs.push_back(AllArgs[i]); 4421 return Invalid; 4422} 4423 4424static inline bool 4425CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4426 const FunctionDecl *FnDecl) { 4427 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4428 if (isa<NamespaceDecl>(DC)) { 4429 return SemaRef.Diag(FnDecl->getLocation(), 4430 diag::err_operator_new_delete_declared_in_namespace) 4431 << FnDecl->getDeclName(); 4432 } 4433 4434 if (isa<TranslationUnitDecl>(DC) && 4435 FnDecl->getStorageClass() == FunctionDecl::Static) { 4436 return SemaRef.Diag(FnDecl->getLocation(), 4437 diag::err_operator_new_delete_declared_static) 4438 << FnDecl->getDeclName(); 4439 } 4440 4441 return false; 4442} 4443 4444static inline bool 4445CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4446 CanQualType ExpectedResultType, 4447 CanQualType ExpectedFirstParamType, 4448 unsigned DependentParamTypeDiag, 4449 unsigned InvalidParamTypeDiag) { 4450 QualType ResultType = 4451 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4452 4453 // Check that the result type is not dependent. 4454 if (ResultType->isDependentType()) 4455 return SemaRef.Diag(FnDecl->getLocation(), 4456 diag::err_operator_new_delete_dependent_result_type) 4457 << FnDecl->getDeclName() << ExpectedResultType; 4458 4459 // Check that the result type is what we expect. 4460 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4461 return SemaRef.Diag(FnDecl->getLocation(), 4462 diag::err_operator_new_delete_invalid_result_type) 4463 << FnDecl->getDeclName() << ExpectedResultType; 4464 4465 // A function template must have at least 2 parameters. 4466 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4467 return SemaRef.Diag(FnDecl->getLocation(), 4468 diag::err_operator_new_delete_template_too_few_parameters) 4469 << FnDecl->getDeclName(); 4470 4471 // The function decl must have at least 1 parameter. 4472 if (FnDecl->getNumParams() == 0) 4473 return SemaRef.Diag(FnDecl->getLocation(), 4474 diag::err_operator_new_delete_too_few_parameters) 4475 << FnDecl->getDeclName(); 4476 4477 // Check the the first parameter type is not dependent. 4478 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4479 if (FirstParamType->isDependentType()) 4480 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4481 << FnDecl->getDeclName() << ExpectedFirstParamType; 4482 4483 // Check that the first parameter type is what we expect. 4484 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4485 ExpectedFirstParamType) 4486 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4487 << FnDecl->getDeclName() << ExpectedFirstParamType; 4488 4489 return false; 4490} 4491 4492static bool 4493CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4494 // C++ [basic.stc.dynamic.allocation]p1: 4495 // A program is ill-formed if an allocation function is declared in a 4496 // namespace scope other than global scope or declared static in global 4497 // scope. 4498 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4499 return true; 4500 4501 CanQualType SizeTy = 4502 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4503 4504 // C++ [basic.stc.dynamic.allocation]p1: 4505 // The return type shall be void*. The first parameter shall have type 4506 // std::size_t. 4507 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4508 SizeTy, 4509 diag::err_operator_new_dependent_param_type, 4510 diag::err_operator_new_param_type)) 4511 return true; 4512 4513 // C++ [basic.stc.dynamic.allocation]p1: 4514 // The first parameter shall not have an associated default argument. 4515 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4516 return SemaRef.Diag(FnDecl->getLocation(), 4517 diag::err_operator_new_default_arg) 4518 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4519 4520 return false; 4521} 4522 4523static bool 4524CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4525 // C++ [basic.stc.dynamic.deallocation]p1: 4526 // A program is ill-formed if deallocation functions are declared in a 4527 // namespace scope other than global scope or declared static in global 4528 // scope. 4529 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4530 return true; 4531 4532 // C++ [basic.stc.dynamic.deallocation]p2: 4533 // Each deallocation function shall return void and its first parameter 4534 // shall be void*. 4535 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4536 SemaRef.Context.VoidPtrTy, 4537 diag::err_operator_delete_dependent_param_type, 4538 diag::err_operator_delete_param_type)) 4539 return true; 4540 4541 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4542 if (FirstParamType->isDependentType()) 4543 return SemaRef.Diag(FnDecl->getLocation(), 4544 diag::err_operator_delete_dependent_param_type) 4545 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4546 4547 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4548 SemaRef.Context.VoidPtrTy) 4549 return SemaRef.Diag(FnDecl->getLocation(), 4550 diag::err_operator_delete_param_type) 4551 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4552 4553 return false; 4554} 4555 4556/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4557/// of this overloaded operator is well-formed. If so, returns false; 4558/// otherwise, emits appropriate diagnostics and returns true. 4559bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4560 assert(FnDecl && FnDecl->isOverloadedOperator() && 4561 "Expected an overloaded operator declaration"); 4562 4563 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4564 4565 // C++ [over.oper]p5: 4566 // The allocation and deallocation functions, operator new, 4567 // operator new[], operator delete and operator delete[], are 4568 // described completely in 3.7.3. The attributes and restrictions 4569 // found in the rest of this subclause do not apply to them unless 4570 // explicitly stated in 3.7.3. 4571 if (Op == OO_Delete || Op == OO_Array_Delete) 4572 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4573 4574 if (Op == OO_New || Op == OO_Array_New) 4575 return CheckOperatorNewDeclaration(*this, FnDecl); 4576 4577 // C++ [over.oper]p6: 4578 // An operator function shall either be a non-static member 4579 // function or be a non-member function and have at least one 4580 // parameter whose type is a class, a reference to a class, an 4581 // enumeration, or a reference to an enumeration. 4582 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4583 if (MethodDecl->isStatic()) 4584 return Diag(FnDecl->getLocation(), 4585 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4586 } else { 4587 bool ClassOrEnumParam = false; 4588 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4589 ParamEnd = FnDecl->param_end(); 4590 Param != ParamEnd; ++Param) { 4591 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4592 if (ParamType->isDependentType() || ParamType->isRecordType() || 4593 ParamType->isEnumeralType()) { 4594 ClassOrEnumParam = true; 4595 break; 4596 } 4597 } 4598 4599 if (!ClassOrEnumParam) 4600 return Diag(FnDecl->getLocation(), 4601 diag::err_operator_overload_needs_class_or_enum) 4602 << FnDecl->getDeclName(); 4603 } 4604 4605 // C++ [over.oper]p8: 4606 // An operator function cannot have default arguments (8.3.6), 4607 // except where explicitly stated below. 4608 // 4609 // Only the function-call operator allows default arguments 4610 // (C++ [over.call]p1). 4611 if (Op != OO_Call) { 4612 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4613 Param != FnDecl->param_end(); ++Param) { 4614 if ((*Param)->hasDefaultArg()) 4615 return Diag((*Param)->getLocation(), 4616 diag::err_operator_overload_default_arg) 4617 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4618 } 4619 } 4620 4621 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4622 { false, false, false } 4623#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4624 , { Unary, Binary, MemberOnly } 4625#include "clang/Basic/OperatorKinds.def" 4626 }; 4627 4628 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4629 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4630 bool MustBeMemberOperator = OperatorUses[Op][2]; 4631 4632 // C++ [over.oper]p8: 4633 // [...] Operator functions cannot have more or fewer parameters 4634 // than the number required for the corresponding operator, as 4635 // described in the rest of this subclause. 4636 unsigned NumParams = FnDecl->getNumParams() 4637 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4638 if (Op != OO_Call && 4639 ((NumParams == 1 && !CanBeUnaryOperator) || 4640 (NumParams == 2 && !CanBeBinaryOperator) || 4641 (NumParams < 1) || (NumParams > 2))) { 4642 // We have the wrong number of parameters. 4643 unsigned ErrorKind; 4644 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4645 ErrorKind = 2; // 2 -> unary or binary. 4646 } else if (CanBeUnaryOperator) { 4647 ErrorKind = 0; // 0 -> unary 4648 } else { 4649 assert(CanBeBinaryOperator && 4650 "All non-call overloaded operators are unary or binary!"); 4651 ErrorKind = 1; // 1 -> binary 4652 } 4653 4654 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4655 << FnDecl->getDeclName() << NumParams << ErrorKind; 4656 } 4657 4658 // Overloaded operators other than operator() cannot be variadic. 4659 if (Op != OO_Call && 4660 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4661 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4662 << FnDecl->getDeclName(); 4663 } 4664 4665 // Some operators must be non-static member functions. 4666 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4667 return Diag(FnDecl->getLocation(), 4668 diag::err_operator_overload_must_be_member) 4669 << FnDecl->getDeclName(); 4670 } 4671 4672 // C++ [over.inc]p1: 4673 // The user-defined function called operator++ implements the 4674 // prefix and postfix ++ operator. If this function is a member 4675 // function with no parameters, or a non-member function with one 4676 // parameter of class or enumeration type, it defines the prefix 4677 // increment operator ++ for objects of that type. If the function 4678 // is a member function with one parameter (which shall be of type 4679 // int) or a non-member function with two parameters (the second 4680 // of which shall be of type int), it defines the postfix 4681 // increment operator ++ for objects of that type. 4682 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 4683 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 4684 bool ParamIsInt = false; 4685 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 4686 ParamIsInt = BT->getKind() == BuiltinType::Int; 4687 4688 if (!ParamIsInt) 4689 return Diag(LastParam->getLocation(), 4690 diag::err_operator_overload_post_incdec_must_be_int) 4691 << LastParam->getType() << (Op == OO_MinusMinus); 4692 } 4693 4694 // Notify the class if it got an assignment operator. 4695 if (Op == OO_Equal) { 4696 // Would have returned earlier otherwise. 4697 assert(isa<CXXMethodDecl>(FnDecl) && 4698 "Overloaded = not member, but not filtered."); 4699 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 4700 Method->getParent()->addedAssignmentOperator(Context, Method); 4701 } 4702 4703 return false; 4704} 4705 4706/// CheckLiteralOperatorDeclaration - Check whether the declaration 4707/// of this literal operator function is well-formed. If so, returns 4708/// false; otherwise, emits appropriate diagnostics and returns true. 4709bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 4710 DeclContext *DC = FnDecl->getDeclContext(); 4711 Decl::Kind Kind = DC->getDeclKind(); 4712 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 4713 Kind != Decl::LinkageSpec) { 4714 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 4715 << FnDecl->getDeclName(); 4716 return true; 4717 } 4718 4719 bool Valid = false; 4720 4721 // template <char...> type operator "" name() is the only valid template 4722 // signature, and the only valid signature with no parameters. 4723 if (FnDecl->param_size() == 0) { 4724 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 4725 // Must have only one template parameter 4726 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 4727 if (Params->size() == 1) { 4728 NonTypeTemplateParmDecl *PmDecl = 4729 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 4730 4731 // The template parameter must be a char parameter pack. 4732 // FIXME: This test will always fail because non-type parameter packs 4733 // have not been implemented. 4734 if (PmDecl && PmDecl->isTemplateParameterPack() && 4735 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 4736 Valid = true; 4737 } 4738 } 4739 } else { 4740 // Check the first parameter 4741 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4742 4743 QualType T = (*Param)->getType(); 4744 4745 // unsigned long long int, long double, and any character type are allowed 4746 // as the only parameters. 4747 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 4748 Context.hasSameType(T, Context.LongDoubleTy) || 4749 Context.hasSameType(T, Context.CharTy) || 4750 Context.hasSameType(T, Context.WCharTy) || 4751 Context.hasSameType(T, Context.Char16Ty) || 4752 Context.hasSameType(T, Context.Char32Ty)) { 4753 if (++Param == FnDecl->param_end()) 4754 Valid = true; 4755 goto FinishedParams; 4756 } 4757 4758 // Otherwise it must be a pointer to const; let's strip those qualifiers. 4759 const PointerType *PT = T->getAs<PointerType>(); 4760 if (!PT) 4761 goto FinishedParams; 4762 T = PT->getPointeeType(); 4763 if (!T.isConstQualified()) 4764 goto FinishedParams; 4765 T = T.getUnqualifiedType(); 4766 4767 // Move on to the second parameter; 4768 ++Param; 4769 4770 // If there is no second parameter, the first must be a const char * 4771 if (Param == FnDecl->param_end()) { 4772 if (Context.hasSameType(T, Context.CharTy)) 4773 Valid = true; 4774 goto FinishedParams; 4775 } 4776 4777 // const char *, const wchar_t*, const char16_t*, and const char32_t* 4778 // are allowed as the first parameter to a two-parameter function 4779 if (!(Context.hasSameType(T, Context.CharTy) || 4780 Context.hasSameType(T, Context.WCharTy) || 4781 Context.hasSameType(T, Context.Char16Ty) || 4782 Context.hasSameType(T, Context.Char32Ty))) 4783 goto FinishedParams; 4784 4785 // The second and final parameter must be an std::size_t 4786 T = (*Param)->getType().getUnqualifiedType(); 4787 if (Context.hasSameType(T, Context.getSizeType()) && 4788 ++Param == FnDecl->param_end()) 4789 Valid = true; 4790 } 4791 4792 // FIXME: This diagnostic is absolutely terrible. 4793FinishedParams: 4794 if (!Valid) { 4795 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 4796 << FnDecl->getDeclName(); 4797 return true; 4798 } 4799 4800 return false; 4801} 4802 4803/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 4804/// linkage specification, including the language and (if present) 4805/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 4806/// the location of the language string literal, which is provided 4807/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 4808/// the '{' brace. Otherwise, this linkage specification does not 4809/// have any braces. 4810Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 4811 SourceLocation ExternLoc, 4812 SourceLocation LangLoc, 4813 const char *Lang, 4814 unsigned StrSize, 4815 SourceLocation LBraceLoc) { 4816 LinkageSpecDecl::LanguageIDs Language; 4817 if (strncmp(Lang, "\"C\"", StrSize) == 0) 4818 Language = LinkageSpecDecl::lang_c; 4819 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 4820 Language = LinkageSpecDecl::lang_cxx; 4821 else { 4822 Diag(LangLoc, diag::err_bad_language); 4823 return DeclPtrTy(); 4824 } 4825 4826 // FIXME: Add all the various semantics of linkage specifications 4827 4828 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 4829 LangLoc, Language, 4830 LBraceLoc.isValid()); 4831 CurContext->addDecl(D); 4832 PushDeclContext(S, D); 4833 return DeclPtrTy::make(D); 4834} 4835 4836/// ActOnFinishLinkageSpecification - Completely the definition of 4837/// the C++ linkage specification LinkageSpec. If RBraceLoc is 4838/// valid, it's the position of the closing '}' brace in a linkage 4839/// specification that uses braces. 4840Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 4841 DeclPtrTy LinkageSpec, 4842 SourceLocation RBraceLoc) { 4843 if (LinkageSpec) 4844 PopDeclContext(); 4845 return LinkageSpec; 4846} 4847 4848/// \brief Perform semantic analysis for the variable declaration that 4849/// occurs within a C++ catch clause, returning the newly-created 4850/// variable. 4851VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 4852 TypeSourceInfo *TInfo, 4853 IdentifierInfo *Name, 4854 SourceLocation Loc, 4855 SourceRange Range) { 4856 bool Invalid = false; 4857 4858 // Arrays and functions decay. 4859 if (ExDeclType->isArrayType()) 4860 ExDeclType = Context.getArrayDecayedType(ExDeclType); 4861 else if (ExDeclType->isFunctionType()) 4862 ExDeclType = Context.getPointerType(ExDeclType); 4863 4864 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 4865 // The exception-declaration shall not denote a pointer or reference to an 4866 // incomplete type, other than [cv] void*. 4867 // N2844 forbids rvalue references. 4868 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 4869 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 4870 Invalid = true; 4871 } 4872 4873 // GCC allows catching pointers and references to incomplete types 4874 // as an extension; so do we, but we warn by default. 4875 4876 QualType BaseType = ExDeclType; 4877 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 4878 unsigned DK = diag::err_catch_incomplete; 4879 bool IncompleteCatchIsInvalid = true; 4880 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 4881 BaseType = Ptr->getPointeeType(); 4882 Mode = 1; 4883 DK = diag::ext_catch_incomplete_ptr; 4884 IncompleteCatchIsInvalid = false; 4885 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 4886 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 4887 BaseType = Ref->getPointeeType(); 4888 Mode = 2; 4889 DK = diag::ext_catch_incomplete_ref; 4890 IncompleteCatchIsInvalid = false; 4891 } 4892 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 4893 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 4894 IncompleteCatchIsInvalid) 4895 Invalid = true; 4896 4897 if (!Invalid && !ExDeclType->isDependentType() && 4898 RequireNonAbstractType(Loc, ExDeclType, 4899 diag::err_abstract_type_in_decl, 4900 AbstractVariableType)) 4901 Invalid = true; 4902 4903 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 4904 Name, ExDeclType, TInfo, VarDecl::None, 4905 VarDecl::None); 4906 4907 if (!Invalid) { 4908 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 4909 // C++ [except.handle]p16: 4910 // The object declared in an exception-declaration or, if the 4911 // exception-declaration does not specify a name, a temporary (12.2) is 4912 // copy-initialized (8.5) from the exception object. [...] 4913 // The object is destroyed when the handler exits, after the destruction 4914 // of any automatic objects initialized within the handler. 4915 // 4916 // We just pretend to initialize the object with itself, then make sure 4917 // it can be destroyed later. 4918 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 4919 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 4920 Loc, ExDeclType, 0); 4921 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 4922 SourceLocation()); 4923 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 4924 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4925 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 4926 if (Result.isInvalid()) 4927 Invalid = true; 4928 else 4929 FinalizeVarWithDestructor(ExDecl, RecordTy); 4930 } 4931 } 4932 4933 if (Invalid) 4934 ExDecl->setInvalidDecl(); 4935 4936 return ExDecl; 4937} 4938 4939/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 4940/// handler. 4941Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 4942 TypeSourceInfo *TInfo = 0; 4943 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 4944 4945 bool Invalid = D.isInvalidType(); 4946 IdentifierInfo *II = D.getIdentifier(); 4947 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 4948 LookupOrdinaryName, 4949 ForRedeclaration)) { 4950 // The scope should be freshly made just for us. There is just no way 4951 // it contains any previous declaration. 4952 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 4953 if (PrevDecl->isTemplateParameter()) { 4954 // Maybe we will complain about the shadowed template parameter. 4955 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4956 } 4957 } 4958 4959 if (D.getCXXScopeSpec().isSet() && !Invalid) { 4960 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 4961 << D.getCXXScopeSpec().getRange(); 4962 Invalid = true; 4963 } 4964 4965 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 4966 D.getIdentifier(), 4967 D.getIdentifierLoc(), 4968 D.getDeclSpec().getSourceRange()); 4969 4970 if (Invalid) 4971 ExDecl->setInvalidDecl(); 4972 4973 // Add the exception declaration into this scope. 4974 if (II) 4975 PushOnScopeChains(ExDecl, S); 4976 else 4977 CurContext->addDecl(ExDecl); 4978 4979 ProcessDeclAttributes(S, ExDecl, D); 4980 return DeclPtrTy::make(ExDecl); 4981} 4982 4983Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 4984 ExprArg assertexpr, 4985 ExprArg assertmessageexpr) { 4986 Expr *AssertExpr = (Expr *)assertexpr.get(); 4987 StringLiteral *AssertMessage = 4988 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 4989 4990 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 4991 llvm::APSInt Value(32); 4992 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 4993 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 4994 AssertExpr->getSourceRange(); 4995 return DeclPtrTy(); 4996 } 4997 4998 if (Value == 0) { 4999 Diag(AssertLoc, diag::err_static_assert_failed) 5000 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5001 } 5002 } 5003 5004 assertexpr.release(); 5005 assertmessageexpr.release(); 5006 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5007 AssertExpr, AssertMessage); 5008 5009 CurContext->addDecl(Decl); 5010 return DeclPtrTy::make(Decl); 5011} 5012 5013/// \brief Perform semantic analysis of the given friend type declaration. 5014/// 5015/// \returns A friend declaration that. 5016FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 5017 TypeSourceInfo *TSInfo) { 5018 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 5019 5020 QualType T = TSInfo->getType(); 5021 SourceRange TypeRange = TSInfo->getTypeLoc().getSourceRange(); 5022 5023 if (!getLangOptions().CPlusPlus0x) { 5024 // C++03 [class.friend]p2: 5025 // An elaborated-type-specifier shall be used in a friend declaration 5026 // for a class.* 5027 // 5028 // * The class-key of the elaborated-type-specifier is required. 5029 if (!ActiveTemplateInstantiations.empty()) { 5030 // Do not complain about the form of friend template types during 5031 // template instantiation; we will already have complained when the 5032 // template was declared. 5033 } else if (!T->isElaboratedTypeSpecifier()) { 5034 // If we evaluated the type to a record type, suggest putting 5035 // a tag in front. 5036 if (const RecordType *RT = T->getAs<RecordType>()) { 5037 RecordDecl *RD = RT->getDecl(); 5038 5039 std::string InsertionText = std::string(" ") + RD->getKindName(); 5040 5041 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 5042 << (unsigned) RD->getTagKind() 5043 << T 5044 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 5045 InsertionText); 5046 } else { 5047 Diag(FriendLoc, diag::ext_nonclass_type_friend) 5048 << T 5049 << SourceRange(FriendLoc, TypeRange.getEnd()); 5050 } 5051 } else if (T->getAs<EnumType>()) { 5052 Diag(FriendLoc, diag::ext_enum_friend) 5053 << T 5054 << SourceRange(FriendLoc, TypeRange.getEnd()); 5055 } 5056 } 5057 5058 // C++0x [class.friend]p3: 5059 // If the type specifier in a friend declaration designates a (possibly 5060 // cv-qualified) class type, that class is declared as a friend; otherwise, 5061 // the friend declaration is ignored. 5062 5063 // FIXME: C++0x has some syntactic restrictions on friend type declarations 5064 // in [class.friend]p3 that we do not implement. 5065 5066 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 5067} 5068 5069/// Handle a friend type declaration. This works in tandem with 5070/// ActOnTag. 5071/// 5072/// Notes on friend class templates: 5073/// 5074/// We generally treat friend class declarations as if they were 5075/// declaring a class. So, for example, the elaborated type specifier 5076/// in a friend declaration is required to obey the restrictions of a 5077/// class-head (i.e. no typedefs in the scope chain), template 5078/// parameters are required to match up with simple template-ids, &c. 5079/// However, unlike when declaring a template specialization, it's 5080/// okay to refer to a template specialization without an empty 5081/// template parameter declaration, e.g. 5082/// friend class A<T>::B<unsigned>; 5083/// We permit this as a special case; if there are any template 5084/// parameters present at all, require proper matching, i.e. 5085/// template <> template <class T> friend class A<int>::B; 5086Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5087 MultiTemplateParamsArg TempParams) { 5088 SourceLocation Loc = DS.getSourceRange().getBegin(); 5089 5090 assert(DS.isFriendSpecified()); 5091 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5092 5093 // Try to convert the decl specifier to a type. This works for 5094 // friend templates because ActOnTag never produces a ClassTemplateDecl 5095 // for a TUK_Friend. 5096 Declarator TheDeclarator(DS, Declarator::MemberContext); 5097 TypeSourceInfo *TSI; 5098 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 5099 if (TheDeclarator.isInvalidType()) 5100 return DeclPtrTy(); 5101 5102 if (!TSI) 5103 TSI = Context.getTrivialTypeSourceInfo(T, DS.getSourceRange().getBegin()); 5104 5105 // This is definitely an error in C++98. It's probably meant to 5106 // be forbidden in C++0x, too, but the specification is just 5107 // poorly written. 5108 // 5109 // The problem is with declarations like the following: 5110 // template <T> friend A<T>::foo; 5111 // where deciding whether a class C is a friend or not now hinges 5112 // on whether there exists an instantiation of A that causes 5113 // 'foo' to equal C. There are restrictions on class-heads 5114 // (which we declare (by fiat) elaborated friend declarations to 5115 // be) that makes this tractable. 5116 // 5117 // FIXME: handle "template <> friend class A<T>;", which 5118 // is possibly well-formed? Who even knows? 5119 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5120 Diag(Loc, diag::err_tagless_friend_type_template) 5121 << DS.getSourceRange(); 5122 return DeclPtrTy(); 5123 } 5124 5125 // C++98 [class.friend]p1: A friend of a class is a function 5126 // or class that is not a member of the class . . . 5127 // This is fixed in DR77, which just barely didn't make the C++03 5128 // deadline. It's also a very silly restriction that seriously 5129 // affects inner classes and which nobody else seems to implement; 5130 // thus we never diagnose it, not even in -pedantic. 5131 // 5132 // But note that we could warn about it: it's always useless to 5133 // friend one of your own members (it's not, however, worthless to 5134 // friend a member of an arbitrary specialization of your template). 5135 5136 Decl *D; 5137 if (unsigned NumTempParamLists = TempParams.size()) 5138 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5139 NumTempParamLists, 5140 (TemplateParameterList**) TempParams.release(), 5141 TSI, 5142 DS.getFriendSpecLoc()); 5143 else 5144 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 5145 5146 if (!D) 5147 return DeclPtrTy(); 5148 5149 D->setAccess(AS_public); 5150 CurContext->addDecl(D); 5151 5152 return DeclPtrTy::make(D); 5153} 5154 5155Sema::DeclPtrTy 5156Sema::ActOnFriendFunctionDecl(Scope *S, 5157 Declarator &D, 5158 bool IsDefinition, 5159 MultiTemplateParamsArg TemplateParams) { 5160 const DeclSpec &DS = D.getDeclSpec(); 5161 5162 assert(DS.isFriendSpecified()); 5163 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5164 5165 SourceLocation Loc = D.getIdentifierLoc(); 5166 TypeSourceInfo *TInfo = 0; 5167 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5168 5169 // C++ [class.friend]p1 5170 // A friend of a class is a function or class.... 5171 // Note that this sees through typedefs, which is intended. 5172 // It *doesn't* see through dependent types, which is correct 5173 // according to [temp.arg.type]p3: 5174 // If a declaration acquires a function type through a 5175 // type dependent on a template-parameter and this causes 5176 // a declaration that does not use the syntactic form of a 5177 // function declarator to have a function type, the program 5178 // is ill-formed. 5179 if (!T->isFunctionType()) { 5180 Diag(Loc, diag::err_unexpected_friend); 5181 5182 // It might be worthwhile to try to recover by creating an 5183 // appropriate declaration. 5184 return DeclPtrTy(); 5185 } 5186 5187 // C++ [namespace.memdef]p3 5188 // - If a friend declaration in a non-local class first declares a 5189 // class or function, the friend class or function is a member 5190 // of the innermost enclosing namespace. 5191 // - The name of the friend is not found by simple name lookup 5192 // until a matching declaration is provided in that namespace 5193 // scope (either before or after the class declaration granting 5194 // friendship). 5195 // - If a friend function is called, its name may be found by the 5196 // name lookup that considers functions from namespaces and 5197 // classes associated with the types of the function arguments. 5198 // - When looking for a prior declaration of a class or a function 5199 // declared as a friend, scopes outside the innermost enclosing 5200 // namespace scope are not considered. 5201 5202 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5203 DeclarationName Name = GetNameForDeclarator(D); 5204 assert(Name); 5205 5206 // The context we found the declaration in, or in which we should 5207 // create the declaration. 5208 DeclContext *DC; 5209 5210 // FIXME: handle local classes 5211 5212 // Recover from invalid scope qualifiers as if they just weren't there. 5213 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5214 ForRedeclaration); 5215 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5216 // FIXME: RequireCompleteDeclContext 5217 DC = computeDeclContext(ScopeQual); 5218 5219 // FIXME: handle dependent contexts 5220 if (!DC) return DeclPtrTy(); 5221 5222 LookupQualifiedName(Previous, DC); 5223 5224 // If searching in that context implicitly found a declaration in 5225 // a different context, treat it like it wasn't found at all. 5226 // TODO: better diagnostics for this case. Suggesting the right 5227 // qualified scope would be nice... 5228 // FIXME: getRepresentativeDecl() is not right here at all 5229 if (Previous.empty() || 5230 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5231 D.setInvalidType(); 5232 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5233 return DeclPtrTy(); 5234 } 5235 5236 // C++ [class.friend]p1: A friend of a class is a function or 5237 // class that is not a member of the class . . . 5238 if (DC->Equals(CurContext)) 5239 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5240 5241 // Otherwise walk out to the nearest namespace scope looking for matches. 5242 } else { 5243 // TODO: handle local class contexts. 5244 5245 DC = CurContext; 5246 while (true) { 5247 // Skip class contexts. If someone can cite chapter and verse 5248 // for this behavior, that would be nice --- it's what GCC and 5249 // EDG do, and it seems like a reasonable intent, but the spec 5250 // really only says that checks for unqualified existing 5251 // declarations should stop at the nearest enclosing namespace, 5252 // not that they should only consider the nearest enclosing 5253 // namespace. 5254 while (DC->isRecord()) 5255 DC = DC->getParent(); 5256 5257 LookupQualifiedName(Previous, DC); 5258 5259 // TODO: decide what we think about using declarations. 5260 if (!Previous.empty()) 5261 break; 5262 5263 if (DC->isFileContext()) break; 5264 DC = DC->getParent(); 5265 } 5266 5267 // C++ [class.friend]p1: A friend of a class is a function or 5268 // class that is not a member of the class . . . 5269 // C++0x changes this for both friend types and functions. 5270 // Most C++ 98 compilers do seem to give an error here, so 5271 // we do, too. 5272 if (!Previous.empty() && DC->Equals(CurContext) 5273 && !getLangOptions().CPlusPlus0x) 5274 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5275 } 5276 5277 if (DC->isFileContext()) { 5278 // This implies that it has to be an operator or function. 5279 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5280 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5281 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5282 Diag(Loc, diag::err_introducing_special_friend) << 5283 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5284 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5285 return DeclPtrTy(); 5286 } 5287 } 5288 5289 bool Redeclaration = false; 5290 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5291 move(TemplateParams), 5292 IsDefinition, 5293 Redeclaration); 5294 if (!ND) return DeclPtrTy(); 5295 5296 assert(ND->getDeclContext() == DC); 5297 assert(ND->getLexicalDeclContext() == CurContext); 5298 5299 // Add the function declaration to the appropriate lookup tables, 5300 // adjusting the redeclarations list as necessary. We don't 5301 // want to do this yet if the friending class is dependent. 5302 // 5303 // Also update the scope-based lookup if the target context's 5304 // lookup context is in lexical scope. 5305 if (!CurContext->isDependentContext()) { 5306 DC = DC->getLookupContext(); 5307 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5308 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5309 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5310 } 5311 5312 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5313 D.getIdentifierLoc(), ND, 5314 DS.getFriendSpecLoc()); 5315 FrD->setAccess(AS_public); 5316 CurContext->addDecl(FrD); 5317 5318 return DeclPtrTy::make(ND); 5319} 5320 5321void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5322 AdjustDeclIfTemplate(dcl); 5323 5324 Decl *Dcl = dcl.getAs<Decl>(); 5325 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5326 if (!Fn) { 5327 Diag(DelLoc, diag::err_deleted_non_function); 5328 return; 5329 } 5330 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5331 Diag(DelLoc, diag::err_deleted_decl_not_first); 5332 Diag(Prev->getLocation(), diag::note_previous_declaration); 5333 // If the declaration wasn't the first, we delete the function anyway for 5334 // recovery. 5335 } 5336 Fn->setDeleted(); 5337} 5338 5339static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5340 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5341 ++CI) { 5342 Stmt *SubStmt = *CI; 5343 if (!SubStmt) 5344 continue; 5345 if (isa<ReturnStmt>(SubStmt)) 5346 Self.Diag(SubStmt->getSourceRange().getBegin(), 5347 diag::err_return_in_constructor_handler); 5348 if (!isa<Expr>(SubStmt)) 5349 SearchForReturnInStmt(Self, SubStmt); 5350 } 5351} 5352 5353void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5354 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5355 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5356 SearchForReturnInStmt(*this, Handler); 5357 } 5358} 5359 5360bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5361 const CXXMethodDecl *Old) { 5362 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5363 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5364 5365 if (Context.hasSameType(NewTy, OldTy) || 5366 NewTy->isDependentType() || OldTy->isDependentType()) 5367 return false; 5368 5369 // Check if the return types are covariant 5370 QualType NewClassTy, OldClassTy; 5371 5372 /// Both types must be pointers or references to classes. 5373 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5374 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5375 NewClassTy = NewPT->getPointeeType(); 5376 OldClassTy = OldPT->getPointeeType(); 5377 } 5378 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5379 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5380 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5381 NewClassTy = NewRT->getPointeeType(); 5382 OldClassTy = OldRT->getPointeeType(); 5383 } 5384 } 5385 } 5386 5387 // The return types aren't either both pointers or references to a class type. 5388 if (NewClassTy.isNull()) { 5389 Diag(New->getLocation(), 5390 diag::err_different_return_type_for_overriding_virtual_function) 5391 << New->getDeclName() << NewTy << OldTy; 5392 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5393 5394 return true; 5395 } 5396 5397 // C++ [class.virtual]p6: 5398 // If the return type of D::f differs from the return type of B::f, the 5399 // class type in the return type of D::f shall be complete at the point of 5400 // declaration of D::f or shall be the class type D. 5401 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5402 if (!RT->isBeingDefined() && 5403 RequireCompleteType(New->getLocation(), NewClassTy, 5404 PDiag(diag::err_covariant_return_incomplete) 5405 << New->getDeclName())) 5406 return true; 5407 } 5408 5409 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5410 // Check if the new class derives from the old class. 5411 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5412 Diag(New->getLocation(), 5413 diag::err_covariant_return_not_derived) 5414 << New->getDeclName() << NewTy << OldTy; 5415 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5416 return true; 5417 } 5418 5419 // Check if we the conversion from derived to base is valid. 5420 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5421 diag::err_covariant_return_inaccessible_base, 5422 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5423 // FIXME: Should this point to the return type? 5424 New->getLocation(), SourceRange(), New->getDeclName())) { 5425 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5426 return true; 5427 } 5428 } 5429 5430 // The qualifiers of the return types must be the same. 5431 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5432 Diag(New->getLocation(), 5433 diag::err_covariant_return_type_different_qualifications) 5434 << New->getDeclName() << NewTy << OldTy; 5435 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5436 return true; 5437 }; 5438 5439 5440 // The new class type must have the same or less qualifiers as the old type. 5441 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5442 Diag(New->getLocation(), 5443 diag::err_covariant_return_type_class_type_more_qualified) 5444 << New->getDeclName() << NewTy << OldTy; 5445 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5446 return true; 5447 }; 5448 5449 return false; 5450} 5451 5452bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5453 const CXXMethodDecl *Old) 5454{ 5455 if (Old->hasAttr<FinalAttr>()) { 5456 Diag(New->getLocation(), diag::err_final_function_overridden) 5457 << New->getDeclName(); 5458 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5459 return true; 5460 } 5461 5462 return false; 5463} 5464 5465/// \brief Mark the given method pure. 5466/// 5467/// \param Method the method to be marked pure. 5468/// 5469/// \param InitRange the source range that covers the "0" initializer. 5470bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5471 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5472 Method->setPure(); 5473 5474 // A class is abstract if at least one function is pure virtual. 5475 Method->getParent()->setAbstract(true); 5476 return false; 5477 } 5478 5479 if (!Method->isInvalidDecl()) 5480 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5481 << Method->getDeclName() << InitRange; 5482 return true; 5483} 5484 5485/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5486/// an initializer for the out-of-line declaration 'Dcl'. The scope 5487/// is a fresh scope pushed for just this purpose. 5488/// 5489/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5490/// static data member of class X, names should be looked up in the scope of 5491/// class X. 5492void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5493 // If there is no declaration, there was an error parsing it. 5494 Decl *D = Dcl.getAs<Decl>(); 5495 if (D == 0) return; 5496 5497 // We should only get called for declarations with scope specifiers, like: 5498 // int foo::bar; 5499 assert(D->isOutOfLine()); 5500 EnterDeclaratorContext(S, D->getDeclContext()); 5501} 5502 5503/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5504/// initializer for the out-of-line declaration 'Dcl'. 5505void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5506 // If there is no declaration, there was an error parsing it. 5507 Decl *D = Dcl.getAs<Decl>(); 5508 if (D == 0) return; 5509 5510 assert(D->isOutOfLine()); 5511 ExitDeclaratorContext(S); 5512} 5513 5514/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5515/// C++ if/switch/while/for statement. 5516/// e.g: "if (int x = f()) {...}" 5517Action::DeclResult 5518Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5519 // C++ 6.4p2: 5520 // The declarator shall not specify a function or an array. 5521 // The type-specifier-seq shall not contain typedef and shall not declare a 5522 // new class or enumeration. 5523 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5524 "Parser allowed 'typedef' as storage class of condition decl."); 5525 5526 TypeSourceInfo *TInfo = 0; 5527 TagDecl *OwnedTag = 0; 5528 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5529 5530 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5531 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5532 // would be created and CXXConditionDeclExpr wants a VarDecl. 5533 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5534 << D.getSourceRange(); 5535 return DeclResult(); 5536 } else if (OwnedTag && OwnedTag->isDefinition()) { 5537 // The type-specifier-seq shall not declare a new class or enumeration. 5538 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5539 } 5540 5541 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5542 if (!Dcl) 5543 return DeclResult(); 5544 5545 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5546 VD->setDeclaredInCondition(true); 5547 return Dcl; 5548} 5549 5550static bool needsVTable(CXXMethodDecl *MD, ASTContext &Context) { 5551 // Ignore dependent types. 5552 if (MD->isDependentContext()) 5553 return false; 5554 5555 // Ignore declarations that are not definitions. 5556 if (!MD->isThisDeclarationADefinition()) 5557 return false; 5558 5559 CXXRecordDecl *RD = MD->getParent(); 5560 5561 // Ignore classes without a vtable. 5562 if (!RD->isDynamicClass()) 5563 return false; 5564 5565 switch (MD->getParent()->getTemplateSpecializationKind()) { 5566 case TSK_Undeclared: 5567 case TSK_ExplicitSpecialization: 5568 // Classes that aren't instantiations of templates don't need their 5569 // virtual methods marked until we see the definition of the key 5570 // function. 5571 break; 5572 5573 case TSK_ImplicitInstantiation: 5574 // This is a constructor of a class template; mark all of the virtual 5575 // members as referenced to ensure that they get instantiatied. 5576 if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) 5577 return true; 5578 break; 5579 5580 case TSK_ExplicitInstantiationDeclaration: 5581 return false; 5582 5583 case TSK_ExplicitInstantiationDefinition: 5584 // This is method of a explicit instantiation; mark all of the virtual 5585 // members as referenced to ensure that they get instantiatied. 5586 return true; 5587 } 5588 5589 // Consider only out-of-line definitions of member functions. When we see 5590 // an inline definition, it's too early to compute the key function. 5591 if (!MD->isOutOfLine()) 5592 return false; 5593 5594 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5595 5596 // If there is no key function, we will need a copy of the vtable. 5597 if (!KeyFunction) 5598 return true; 5599 5600 // If this is the key function, we need to mark virtual members. 5601 if (KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) 5602 return true; 5603 5604 return false; 5605} 5606 5607void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5608 CXXMethodDecl *MD) { 5609 CXXRecordDecl *RD = MD->getParent(); 5610 5611 // We will need to mark all of the virtual members as referenced to build the 5612 // vtable. 5613 if (!needsVTable(MD, Context)) 5614 return; 5615 5616 TemplateSpecializationKind kind = RD->getTemplateSpecializationKind(); 5617 if (kind == TSK_ImplicitInstantiation) 5618 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 5619 else 5620 MarkVirtualMembersReferenced(Loc, RD); 5621} 5622 5623bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5624 if (ClassesWithUnmarkedVirtualMembers.empty()) 5625 return false; 5626 5627 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 5628 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 5629 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 5630 ClassesWithUnmarkedVirtualMembers.pop_back(); 5631 MarkVirtualMembersReferenced(Loc, RD); 5632 } 5633 5634 return true; 5635} 5636 5637void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 5638 const CXXRecordDecl *RD) { 5639 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5640 e = RD->method_end(); i != e; ++i) { 5641 CXXMethodDecl *MD = *i; 5642 5643 // C++ [basic.def.odr]p2: 5644 // [...] A virtual member function is used if it is not pure. [...] 5645 if (MD->isVirtual() && !MD->isPure()) 5646 MarkDeclarationReferenced(Loc, MD); 5647 } 5648 5649 // Only classes that have virtual bases need a VTT. 5650 if (RD->getNumVBases() == 0) 5651 return; 5652 5653 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 5654 e = RD->bases_end(); i != e; ++i) { 5655 const CXXRecordDecl *Base = 5656 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 5657 if (i->isVirtual()) 5658 continue; 5659 if (Base->getNumVBases() == 0) 5660 continue; 5661 MarkVirtualMembersReferenced(Loc, Base); 5662 } 5663} 5664