SemaDeclCXX.cpp revision 5cf86ba6b5a724bf91cb52feade1158f1fbeb605
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 713void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 714 CXXBaseSpecifierArray &BasePathArray) { 715 assert(BasePathArray.empty() && "Base path array must be empty!"); 716 assert(Paths.isRecordingPaths() && "Must record paths!"); 717 718 const CXXBasePath &Path = Paths.front(); 719 720 // We first go backward and check if we have a virtual base. 721 // FIXME: It would be better if CXXBasePath had the base specifier for 722 // the nearest virtual base. 723 unsigned Start = 0; 724 for (unsigned I = Path.size(); I != 0; --I) { 725 if (Path[I - 1].Base->isVirtual()) { 726 Start = I - 1; 727 break; 728 } 729 } 730 731 // Now add all bases. 732 for (unsigned I = Start, E = Path.size(); I != E; ++I) 733 BasePathArray.push_back(Path[I].Base); 734} 735 736/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 737/// conversion (where Derived and Base are class types) is 738/// well-formed, meaning that the conversion is unambiguous (and 739/// that all of the base classes are accessible). Returns true 740/// and emits a diagnostic if the code is ill-formed, returns false 741/// otherwise. Loc is the location where this routine should point to 742/// if there is an error, and Range is the source range to highlight 743/// if there is an error. 744bool 745Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 746 unsigned InaccessibleBaseID, 747 unsigned AmbigiousBaseConvID, 748 SourceLocation Loc, SourceRange Range, 749 DeclarationName Name, 750 CXXBaseSpecifierArray *BasePath) { 751 // First, determine whether the path from Derived to Base is 752 // ambiguous. This is slightly more expensive than checking whether 753 // the Derived to Base conversion exists, because here we need to 754 // explore multiple paths to determine if there is an ambiguity. 755 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 756 /*DetectVirtual=*/false); 757 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 758 assert(DerivationOkay && 759 "Can only be used with a derived-to-base conversion"); 760 (void)DerivationOkay; 761 762 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 763 if (InaccessibleBaseID) { 764 // Check that the base class can be accessed. 765 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 766 InaccessibleBaseID)) { 767 case AR_inaccessible: 768 return true; 769 case AR_accessible: 770 case AR_dependent: 771 case AR_delayed: 772 break; 773 } 774 } 775 776 // Build a base path if necessary. 777 if (BasePath) 778 BuildBasePathArray(Paths, *BasePath); 779 return false; 780 } 781 782 // We know that the derived-to-base conversion is ambiguous, and 783 // we're going to produce a diagnostic. Perform the derived-to-base 784 // search just one more time to compute all of the possible paths so 785 // that we can print them out. This is more expensive than any of 786 // the previous derived-to-base checks we've done, but at this point 787 // performance isn't as much of an issue. 788 Paths.clear(); 789 Paths.setRecordingPaths(true); 790 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 791 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 792 (void)StillOkay; 793 794 // Build up a textual representation of the ambiguous paths, e.g., 795 // D -> B -> A, that will be used to illustrate the ambiguous 796 // conversions in the diagnostic. We only print one of the paths 797 // to each base class subobject. 798 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 799 800 Diag(Loc, AmbigiousBaseConvID) 801 << Derived << Base << PathDisplayStr << Range << Name; 802 return true; 803} 804 805bool 806Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 807 SourceLocation Loc, SourceRange Range, 808 CXXBaseSpecifierArray *BasePath, 809 bool IgnoreAccess) { 810 return CheckDerivedToBaseConversion(Derived, Base, 811 IgnoreAccess ? 0 812 : diag::err_upcast_to_inaccessible_base, 813 diag::err_ambiguous_derived_to_base_conv, 814 Loc, Range, DeclarationName(), 815 BasePath); 816} 817 818 819/// @brief Builds a string representing ambiguous paths from a 820/// specific derived class to different subobjects of the same base 821/// class. 822/// 823/// This function builds a string that can be used in error messages 824/// to show the different paths that one can take through the 825/// inheritance hierarchy to go from the derived class to different 826/// subobjects of a base class. The result looks something like this: 827/// @code 828/// struct D -> struct B -> struct A 829/// struct D -> struct C -> struct A 830/// @endcode 831std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 832 std::string PathDisplayStr; 833 std::set<unsigned> DisplayedPaths; 834 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 835 Path != Paths.end(); ++Path) { 836 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 837 // We haven't displayed a path to this particular base 838 // class subobject yet. 839 PathDisplayStr += "\n "; 840 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 841 for (CXXBasePath::const_iterator Element = Path->begin(); 842 Element != Path->end(); ++Element) 843 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 844 } 845 } 846 847 return PathDisplayStr; 848} 849 850//===----------------------------------------------------------------------===// 851// C++ class member Handling 852//===----------------------------------------------------------------------===// 853 854/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 855/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 856/// bitfield width if there is one and 'InitExpr' specifies the initializer if 857/// any. 858Sema::DeclPtrTy 859Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 860 MultiTemplateParamsArg TemplateParameterLists, 861 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 862 bool Deleted) { 863 const DeclSpec &DS = D.getDeclSpec(); 864 DeclarationName Name = GetNameForDeclarator(D); 865 Expr *BitWidth = static_cast<Expr*>(BW); 866 Expr *Init = static_cast<Expr*>(InitExpr); 867 SourceLocation Loc = D.getIdentifierLoc(); 868 869 bool isFunc = D.isFunctionDeclarator(); 870 871 assert(!DS.isFriendSpecified()); 872 873 // C++ 9.2p6: A member shall not be declared to have automatic storage 874 // duration (auto, register) or with the extern storage-class-specifier. 875 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 876 // data members and cannot be applied to names declared const or static, 877 // and cannot be applied to reference members. 878 switch (DS.getStorageClassSpec()) { 879 case DeclSpec::SCS_unspecified: 880 case DeclSpec::SCS_typedef: 881 case DeclSpec::SCS_static: 882 // FALL THROUGH. 883 break; 884 case DeclSpec::SCS_mutable: 885 if (isFunc) { 886 if (DS.getStorageClassSpecLoc().isValid()) 887 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 888 else 889 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 890 891 // FIXME: It would be nicer if the keyword was ignored only for this 892 // declarator. Otherwise we could get follow-up errors. 893 D.getMutableDeclSpec().ClearStorageClassSpecs(); 894 } else { 895 QualType T = GetTypeForDeclarator(D, S); 896 diag::kind err = static_cast<diag::kind>(0); 897 if (T->isReferenceType()) 898 err = diag::err_mutable_reference; 899 else if (T.isConstQualified()) 900 err = diag::err_mutable_const; 901 if (err != 0) { 902 if (DS.getStorageClassSpecLoc().isValid()) 903 Diag(DS.getStorageClassSpecLoc(), err); 904 else 905 Diag(DS.getThreadSpecLoc(), err); 906 // FIXME: It would be nicer if the keyword was ignored only for this 907 // declarator. Otherwise we could get follow-up errors. 908 D.getMutableDeclSpec().ClearStorageClassSpecs(); 909 } 910 } 911 break; 912 default: 913 if (DS.getStorageClassSpecLoc().isValid()) 914 Diag(DS.getStorageClassSpecLoc(), 915 diag::err_storageclass_invalid_for_member); 916 else 917 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 918 D.getMutableDeclSpec().ClearStorageClassSpecs(); 919 } 920 921 if (!isFunc && 922 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 923 D.getNumTypeObjects() == 0) { 924 // Check also for this case: 925 // 926 // typedef int f(); 927 // f a; 928 // 929 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 930 isFunc = TDType->isFunctionType(); 931 } 932 933 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 934 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 935 !isFunc); 936 937 Decl *Member; 938 if (isInstField) { 939 // FIXME: Check for template parameters! 940 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 941 AS); 942 assert(Member && "HandleField never returns null"); 943 } else { 944 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 945 .getAs<Decl>(); 946 if (!Member) { 947 if (BitWidth) DeleteExpr(BitWidth); 948 return DeclPtrTy(); 949 } 950 951 // Non-instance-fields can't have a bitfield. 952 if (BitWidth) { 953 if (Member->isInvalidDecl()) { 954 // don't emit another diagnostic. 955 } else if (isa<VarDecl>(Member)) { 956 // C++ 9.6p3: A bit-field shall not be a static member. 957 // "static member 'A' cannot be a bit-field" 958 Diag(Loc, diag::err_static_not_bitfield) 959 << Name << BitWidth->getSourceRange(); 960 } else if (isa<TypedefDecl>(Member)) { 961 // "typedef member 'x' cannot be a bit-field" 962 Diag(Loc, diag::err_typedef_not_bitfield) 963 << Name << BitWidth->getSourceRange(); 964 } else { 965 // A function typedef ("typedef int f(); f a;"). 966 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 967 Diag(Loc, diag::err_not_integral_type_bitfield) 968 << Name << cast<ValueDecl>(Member)->getType() 969 << BitWidth->getSourceRange(); 970 } 971 972 DeleteExpr(BitWidth); 973 BitWidth = 0; 974 Member->setInvalidDecl(); 975 } 976 977 Member->setAccess(AS); 978 979 // If we have declared a member function template, set the access of the 980 // templated declaration as well. 981 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 982 FunTmpl->getTemplatedDecl()->setAccess(AS); 983 } 984 985 assert((Name || isInstField) && "No identifier for non-field ?"); 986 987 if (Init) 988 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 989 if (Deleted) // FIXME: Source location is not very good. 990 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 991 992 if (isInstField) { 993 FieldCollector->Add(cast<FieldDecl>(Member)); 994 return DeclPtrTy(); 995 } 996 return DeclPtrTy::make(Member); 997} 998 999/// \brief Find the direct and/or virtual base specifiers that 1000/// correspond to the given base type, for use in base initialization 1001/// within a constructor. 1002static bool FindBaseInitializer(Sema &SemaRef, 1003 CXXRecordDecl *ClassDecl, 1004 QualType BaseType, 1005 const CXXBaseSpecifier *&DirectBaseSpec, 1006 const CXXBaseSpecifier *&VirtualBaseSpec) { 1007 // First, check for a direct base class. 1008 DirectBaseSpec = 0; 1009 for (CXXRecordDecl::base_class_const_iterator Base 1010 = ClassDecl->bases_begin(); 1011 Base != ClassDecl->bases_end(); ++Base) { 1012 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1013 // We found a direct base of this type. That's what we're 1014 // initializing. 1015 DirectBaseSpec = &*Base; 1016 break; 1017 } 1018 } 1019 1020 // Check for a virtual base class. 1021 // FIXME: We might be able to short-circuit this if we know in advance that 1022 // there are no virtual bases. 1023 VirtualBaseSpec = 0; 1024 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1025 // We haven't found a base yet; search the class hierarchy for a 1026 // virtual base class. 1027 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1028 /*DetectVirtual=*/false); 1029 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1030 BaseType, Paths)) { 1031 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1032 Path != Paths.end(); ++Path) { 1033 if (Path->back().Base->isVirtual()) { 1034 VirtualBaseSpec = Path->back().Base; 1035 break; 1036 } 1037 } 1038 } 1039 } 1040 1041 return DirectBaseSpec || VirtualBaseSpec; 1042} 1043 1044/// ActOnMemInitializer - Handle a C++ member initializer. 1045Sema::MemInitResult 1046Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1047 Scope *S, 1048 CXXScopeSpec &SS, 1049 IdentifierInfo *MemberOrBase, 1050 TypeTy *TemplateTypeTy, 1051 SourceLocation IdLoc, 1052 SourceLocation LParenLoc, 1053 ExprTy **Args, unsigned NumArgs, 1054 SourceLocation *CommaLocs, 1055 SourceLocation RParenLoc) { 1056 if (!ConstructorD) 1057 return true; 1058 1059 AdjustDeclIfTemplate(ConstructorD); 1060 1061 CXXConstructorDecl *Constructor 1062 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1063 if (!Constructor) { 1064 // The user wrote a constructor initializer on a function that is 1065 // not a C++ constructor. Ignore the error for now, because we may 1066 // have more member initializers coming; we'll diagnose it just 1067 // once in ActOnMemInitializers. 1068 return true; 1069 } 1070 1071 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1072 1073 // C++ [class.base.init]p2: 1074 // Names in a mem-initializer-id are looked up in the scope of the 1075 // constructor’s class and, if not found in that scope, are looked 1076 // up in the scope containing the constructor’s 1077 // definition. [Note: if the constructor’s class contains a member 1078 // with the same name as a direct or virtual base class of the 1079 // class, a mem-initializer-id naming the member or base class and 1080 // composed of a single identifier refers to the class member. A 1081 // mem-initializer-id for the hidden base class may be specified 1082 // using a qualified name. ] 1083 if (!SS.getScopeRep() && !TemplateTypeTy) { 1084 // Look for a member, first. 1085 FieldDecl *Member = 0; 1086 DeclContext::lookup_result Result 1087 = ClassDecl->lookup(MemberOrBase); 1088 if (Result.first != Result.second) 1089 Member = dyn_cast<FieldDecl>(*Result.first); 1090 1091 // FIXME: Handle members of an anonymous union. 1092 1093 if (Member) 1094 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1095 LParenLoc, RParenLoc); 1096 } 1097 // It didn't name a member, so see if it names a class. 1098 QualType BaseType; 1099 TypeSourceInfo *TInfo = 0; 1100 1101 if (TemplateTypeTy) { 1102 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1103 } else { 1104 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1105 LookupParsedName(R, S, &SS); 1106 1107 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1108 if (!TyD) { 1109 if (R.isAmbiguous()) return true; 1110 1111 // We don't want access-control diagnostics here. 1112 R.suppressDiagnostics(); 1113 1114 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1115 bool NotUnknownSpecialization = false; 1116 DeclContext *DC = computeDeclContext(SS, false); 1117 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1118 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1119 1120 if (!NotUnknownSpecialization) { 1121 // When the scope specifier can refer to a member of an unknown 1122 // specialization, we take it as a type name. 1123 BaseType = CheckTypenameType(ETK_None, 1124 (NestedNameSpecifier *)SS.getScopeRep(), 1125 *MemberOrBase, SS.getRange()); 1126 if (BaseType.isNull()) 1127 return true; 1128 1129 R.clear(); 1130 } 1131 } 1132 1133 // If no results were found, try to correct typos. 1134 if (R.empty() && BaseType.isNull() && 1135 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1136 R.isSingleResult()) { 1137 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1138 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1139 // We have found a non-static data member with a similar 1140 // name to what was typed; complain and initialize that 1141 // member. 1142 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1143 << MemberOrBase << true << R.getLookupName() 1144 << FixItHint::CreateReplacement(R.getNameLoc(), 1145 R.getLookupName().getAsString()); 1146 Diag(Member->getLocation(), diag::note_previous_decl) 1147 << Member->getDeclName(); 1148 1149 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1150 LParenLoc, RParenLoc); 1151 } 1152 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1153 const CXXBaseSpecifier *DirectBaseSpec; 1154 const CXXBaseSpecifier *VirtualBaseSpec; 1155 if (FindBaseInitializer(*this, ClassDecl, 1156 Context.getTypeDeclType(Type), 1157 DirectBaseSpec, VirtualBaseSpec)) { 1158 // We have found a direct or virtual base class with a 1159 // similar name to what was typed; complain and initialize 1160 // that base class. 1161 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1162 << MemberOrBase << false << R.getLookupName() 1163 << FixItHint::CreateReplacement(R.getNameLoc(), 1164 R.getLookupName().getAsString()); 1165 1166 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1167 : VirtualBaseSpec; 1168 Diag(BaseSpec->getSourceRange().getBegin(), 1169 diag::note_base_class_specified_here) 1170 << BaseSpec->getType() 1171 << BaseSpec->getSourceRange(); 1172 1173 TyD = Type; 1174 } 1175 } 1176 } 1177 1178 if (!TyD && BaseType.isNull()) { 1179 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1180 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1181 return true; 1182 } 1183 } 1184 1185 if (BaseType.isNull()) { 1186 BaseType = Context.getTypeDeclType(TyD); 1187 if (SS.isSet()) { 1188 NestedNameSpecifier *Qualifier = 1189 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1190 1191 // FIXME: preserve source range information 1192 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1193 } 1194 } 1195 } 1196 1197 if (!TInfo) 1198 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1199 1200 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1201 LParenLoc, RParenLoc, ClassDecl); 1202} 1203 1204/// Checks an initializer expression for use of uninitialized fields, such as 1205/// containing the field that is being initialized. Returns true if there is an 1206/// uninitialized field was used an updates the SourceLocation parameter; false 1207/// otherwise. 1208static bool InitExprContainsUninitializedFields(const Stmt* S, 1209 const FieldDecl* LhsField, 1210 SourceLocation* L) { 1211 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1212 if (ME) { 1213 const NamedDecl* RhsField = ME->getMemberDecl(); 1214 if (RhsField == LhsField) { 1215 // Initializing a field with itself. Throw a warning. 1216 // But wait; there are exceptions! 1217 // Exception #1: The field may not belong to this record. 1218 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1219 const Expr* base = ME->getBase(); 1220 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1221 // Even though the field matches, it does not belong to this record. 1222 return false; 1223 } 1224 // None of the exceptions triggered; return true to indicate an 1225 // uninitialized field was used. 1226 *L = ME->getMemberLoc(); 1227 return true; 1228 } 1229 } 1230 bool found = false; 1231 for (Stmt::const_child_iterator it = S->child_begin(); 1232 it != S->child_end() && found == false; 1233 ++it) { 1234 if (isa<CallExpr>(S)) { 1235 // Do not descend into function calls or constructors, as the use 1236 // of an uninitialized field may be valid. One would have to inspect 1237 // the contents of the function/ctor to determine if it is safe or not. 1238 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1239 // may be safe, depending on what the function/ctor does. 1240 continue; 1241 } 1242 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1243 } 1244 return found; 1245} 1246 1247Sema::MemInitResult 1248Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1249 unsigned NumArgs, SourceLocation IdLoc, 1250 SourceLocation LParenLoc, 1251 SourceLocation RParenLoc) { 1252 // Diagnose value-uses of fields to initialize themselves, e.g. 1253 // foo(foo) 1254 // where foo is not also a parameter to the constructor. 1255 // TODO: implement -Wuninitialized and fold this into that framework. 1256 for (unsigned i = 0; i < NumArgs; ++i) { 1257 SourceLocation L; 1258 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1259 // FIXME: Return true in the case when other fields are used before being 1260 // uninitialized. For example, let this field be the i'th field. When 1261 // initializing the i'th field, throw a warning if any of the >= i'th 1262 // fields are used, as they are not yet initialized. 1263 // Right now we are only handling the case where the i'th field uses 1264 // itself in its initializer. 1265 Diag(L, diag::warn_field_is_uninit); 1266 } 1267 } 1268 1269 bool HasDependentArg = false; 1270 for (unsigned i = 0; i < NumArgs; i++) 1271 HasDependentArg |= Args[i]->isTypeDependent(); 1272 1273 QualType FieldType = Member->getType(); 1274 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1275 FieldType = Array->getElementType(); 1276 if (FieldType->isDependentType() || HasDependentArg) { 1277 // Can't check initialization for a member of dependent type or when 1278 // any of the arguments are type-dependent expressions. 1279 OwningExprResult Init 1280 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1281 RParenLoc)); 1282 1283 // Erase any temporaries within this evaluation context; we're not 1284 // going to track them in the AST, since we'll be rebuilding the 1285 // ASTs during template instantiation. 1286 ExprTemporaries.erase( 1287 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1288 ExprTemporaries.end()); 1289 1290 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1291 LParenLoc, 1292 Init.takeAs<Expr>(), 1293 RParenLoc); 1294 1295 } 1296 1297 if (Member->isInvalidDecl()) 1298 return true; 1299 1300 // Initialize the member. 1301 InitializedEntity MemberEntity = 1302 InitializedEntity::InitializeMember(Member, 0); 1303 InitializationKind Kind = 1304 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1305 1306 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1307 1308 OwningExprResult MemberInit = 1309 InitSeq.Perform(*this, MemberEntity, Kind, 1310 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1311 if (MemberInit.isInvalid()) 1312 return true; 1313 1314 // C++0x [class.base.init]p7: 1315 // The initialization of each base and member constitutes a 1316 // full-expression. 1317 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1318 if (MemberInit.isInvalid()) 1319 return true; 1320 1321 // If we are in a dependent context, template instantiation will 1322 // perform this type-checking again. Just save the arguments that we 1323 // received in a ParenListExpr. 1324 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1325 // of the information that we have about the member 1326 // initializer. However, deconstructing the ASTs is a dicey process, 1327 // and this approach is far more likely to get the corner cases right. 1328 if (CurContext->isDependentContext()) { 1329 // Bump the reference count of all of the arguments. 1330 for (unsigned I = 0; I != NumArgs; ++I) 1331 Args[I]->Retain(); 1332 1333 OwningExprResult Init 1334 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1335 RParenLoc)); 1336 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1337 LParenLoc, 1338 Init.takeAs<Expr>(), 1339 RParenLoc); 1340 } 1341 1342 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1343 LParenLoc, 1344 MemberInit.takeAs<Expr>(), 1345 RParenLoc); 1346} 1347 1348Sema::MemInitResult 1349Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1350 Expr **Args, unsigned NumArgs, 1351 SourceLocation LParenLoc, SourceLocation RParenLoc, 1352 CXXRecordDecl *ClassDecl) { 1353 bool HasDependentArg = false; 1354 for (unsigned i = 0; i < NumArgs; i++) 1355 HasDependentArg |= Args[i]->isTypeDependent(); 1356 1357 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1358 if (BaseType->isDependentType() || HasDependentArg) { 1359 // Can't check initialization for a base of dependent type or when 1360 // any of the arguments are type-dependent expressions. 1361 OwningExprResult BaseInit 1362 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1363 RParenLoc)); 1364 1365 // Erase any temporaries within this evaluation context; we're not 1366 // going to track them in the AST, since we'll be rebuilding the 1367 // ASTs during template instantiation. 1368 ExprTemporaries.erase( 1369 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1370 ExprTemporaries.end()); 1371 1372 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1373 /*IsVirtual=*/false, 1374 LParenLoc, 1375 BaseInit.takeAs<Expr>(), 1376 RParenLoc); 1377 } 1378 1379 if (!BaseType->isRecordType()) 1380 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1381 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1382 1383 // C++ [class.base.init]p2: 1384 // [...] Unless the mem-initializer-id names a nonstatic data 1385 // member of the constructor’s class or a direct or virtual base 1386 // of that class, the mem-initializer is ill-formed. A 1387 // mem-initializer-list can initialize a base class using any 1388 // name that denotes that base class type. 1389 1390 // Check for direct and virtual base classes. 1391 const CXXBaseSpecifier *DirectBaseSpec = 0; 1392 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1393 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1394 VirtualBaseSpec); 1395 1396 // C++ [base.class.init]p2: 1397 // If a mem-initializer-id is ambiguous because it designates both 1398 // a direct non-virtual base class and an inherited virtual base 1399 // class, the mem-initializer is ill-formed. 1400 if (DirectBaseSpec && VirtualBaseSpec) 1401 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1402 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1403 // C++ [base.class.init]p2: 1404 // Unless the mem-initializer-id names a nonstatic data membeer of the 1405 // constructor's class ot a direst or virtual base of that class, the 1406 // mem-initializer is ill-formed. 1407 if (!DirectBaseSpec && !VirtualBaseSpec) 1408 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1409 << BaseType << ClassDecl->getNameAsCString() 1410 << BaseTInfo->getTypeLoc().getSourceRange(); 1411 1412 CXXBaseSpecifier *BaseSpec 1413 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1414 if (!BaseSpec) 1415 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1416 1417 // Initialize the base. 1418 InitializedEntity BaseEntity = 1419 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1420 InitializationKind Kind = 1421 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1422 1423 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1424 1425 OwningExprResult BaseInit = 1426 InitSeq.Perform(*this, BaseEntity, Kind, 1427 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1428 if (BaseInit.isInvalid()) 1429 return true; 1430 1431 // C++0x [class.base.init]p7: 1432 // The initialization of each base and member constitutes a 1433 // full-expression. 1434 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1435 if (BaseInit.isInvalid()) 1436 return true; 1437 1438 // If we are in a dependent context, template instantiation will 1439 // perform this type-checking again. Just save the arguments that we 1440 // received in a ParenListExpr. 1441 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1442 // of the information that we have about the base 1443 // initializer. However, deconstructing the ASTs is a dicey process, 1444 // and this approach is far more likely to get the corner cases right. 1445 if (CurContext->isDependentContext()) { 1446 // Bump the reference count of all of the arguments. 1447 for (unsigned I = 0; I != NumArgs; ++I) 1448 Args[I]->Retain(); 1449 1450 OwningExprResult Init 1451 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1452 RParenLoc)); 1453 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1454 BaseSpec->isVirtual(), 1455 LParenLoc, 1456 Init.takeAs<Expr>(), 1457 RParenLoc); 1458 } 1459 1460 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1461 BaseSpec->isVirtual(), 1462 LParenLoc, 1463 BaseInit.takeAs<Expr>(), 1464 RParenLoc); 1465} 1466 1467/// ImplicitInitializerKind - How an implicit base or member initializer should 1468/// initialize its base or member. 1469enum ImplicitInitializerKind { 1470 IIK_Default, 1471 IIK_Copy, 1472 IIK_Move 1473}; 1474 1475static bool 1476BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1477 ImplicitInitializerKind ImplicitInitKind, 1478 CXXBaseSpecifier *BaseSpec, 1479 bool IsInheritedVirtualBase, 1480 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1481 InitializedEntity InitEntity 1482 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1483 IsInheritedVirtualBase); 1484 1485 Sema::OwningExprResult BaseInit(SemaRef); 1486 1487 switch (ImplicitInitKind) { 1488 case IIK_Default: { 1489 InitializationKind InitKind 1490 = InitializationKind::CreateDefault(Constructor->getLocation()); 1491 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1492 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1493 Sema::MultiExprArg(SemaRef, 0, 0)); 1494 break; 1495 } 1496 1497 case IIK_Copy: { 1498 ParmVarDecl *Param = Constructor->getParamDecl(0); 1499 QualType ParamType = Param->getType().getNonReferenceType(); 1500 1501 Expr *CopyCtorArg = 1502 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1503 SourceLocation(), ParamType, 0); 1504 1505 InitializationKind InitKind 1506 = InitializationKind::CreateDirect(Constructor->getLocation(), 1507 SourceLocation(), SourceLocation()); 1508 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1509 &CopyCtorArg, 1); 1510 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1511 Sema::MultiExprArg(SemaRef, 1512 (void**)&CopyCtorArg, 1)); 1513 break; 1514 } 1515 1516 case IIK_Move: 1517 assert(false && "Unhandled initializer kind!"); 1518 } 1519 1520 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1521 if (BaseInit.isInvalid()) 1522 return true; 1523 1524 CXXBaseInit = 1525 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1526 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1527 SourceLocation()), 1528 BaseSpec->isVirtual(), 1529 SourceLocation(), 1530 BaseInit.takeAs<Expr>(), 1531 SourceLocation()); 1532 1533 return false; 1534} 1535 1536static bool 1537BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1538 ImplicitInitializerKind ImplicitInitKind, 1539 FieldDecl *Field, 1540 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1541 if (ImplicitInitKind == IIK_Copy) { 1542 ParmVarDecl *Param = Constructor->getParamDecl(0); 1543 QualType ParamType = Param->getType().getNonReferenceType(); 1544 1545 Expr *MemberExprBase = 1546 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1547 SourceLocation(), ParamType, 0); 1548 1549 1550 Expr *CopyCtorArg = 1551 MemberExpr::Create(SemaRef.Context, MemberExprBase, /*IsArrow=*/false, 1552 0, SourceRange(), Field, 1553 DeclAccessPair::make(Field, Field->getAccess()), 1554 SourceLocation(), 0, 1555 Field->getType().getNonReferenceType()); 1556 1557 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1558 InitializationKind InitKind = 1559 InitializationKind::CreateDirect(Constructor->getLocation(), 1560 SourceLocation(), SourceLocation()); 1561 1562 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1563 &CopyCtorArg, 1); 1564 1565 Sema::OwningExprResult MemberInit = 1566 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1567 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArg, 1), 0); 1568 if (MemberInit.isInvalid()) 1569 return true; 1570 1571 CXXMemberInit = 0; 1572 return false; 1573 } 1574 1575 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1576 1577 QualType FieldBaseElementType = 1578 SemaRef.Context.getBaseElementType(Field->getType()); 1579 1580 if (FieldBaseElementType->isRecordType()) { 1581 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1582 InitializationKind InitKind = 1583 InitializationKind::CreateDefault(Constructor->getLocation()); 1584 1585 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1586 Sema::OwningExprResult MemberInit = 1587 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1588 Sema::MultiExprArg(SemaRef, 0, 0)); 1589 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1590 if (MemberInit.isInvalid()) 1591 return true; 1592 1593 CXXMemberInit = 1594 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1595 Field, SourceLocation(), 1596 SourceLocation(), 1597 MemberInit.takeAs<Expr>(), 1598 SourceLocation()); 1599 return false; 1600 } 1601 1602 if (FieldBaseElementType->isReferenceType()) { 1603 SemaRef.Diag(Constructor->getLocation(), 1604 diag::err_uninitialized_member_in_ctor) 1605 << (int)Constructor->isImplicit() 1606 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1607 << 0 << Field->getDeclName(); 1608 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1609 return true; 1610 } 1611 1612 if (FieldBaseElementType.isConstQualified()) { 1613 SemaRef.Diag(Constructor->getLocation(), 1614 diag::err_uninitialized_member_in_ctor) 1615 << (int)Constructor->isImplicit() 1616 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1617 << 1 << Field->getDeclName(); 1618 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1619 return true; 1620 } 1621 1622 // Nothing to initialize. 1623 CXXMemberInit = 0; 1624 return false; 1625} 1626 1627bool 1628Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1629 CXXBaseOrMemberInitializer **Initializers, 1630 unsigned NumInitializers, 1631 bool AnyErrors) { 1632 if (Constructor->getDeclContext()->isDependentContext()) { 1633 // Just store the initializers as written, they will be checked during 1634 // instantiation. 1635 if (NumInitializers > 0) { 1636 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1637 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1638 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1639 memcpy(baseOrMemberInitializers, Initializers, 1640 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1641 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1642 } 1643 1644 return false; 1645 } 1646 1647 ImplicitInitializerKind ImplicitInitKind = IIK_Default; 1648 1649 // FIXME: Handle implicit move constructors. 1650 if (Constructor->isImplicit() && Constructor->isCopyConstructor()) 1651 ImplicitInitKind = IIK_Copy; 1652 1653 // We need to build the initializer AST according to order of construction 1654 // and not what user specified in the Initializers list. 1655 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1656 if (!ClassDecl) 1657 return true; 1658 1659 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1660 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1661 bool HadError = false; 1662 1663 for (unsigned i = 0; i < NumInitializers; i++) { 1664 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1665 1666 if (Member->isBaseInitializer()) 1667 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1668 else 1669 AllBaseFields[Member->getMember()] = Member; 1670 } 1671 1672 // Keep track of the direct virtual bases. 1673 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1674 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1675 E = ClassDecl->bases_end(); I != E; ++I) { 1676 if (I->isVirtual()) 1677 DirectVBases.insert(I); 1678 } 1679 1680 // Push virtual bases before others. 1681 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1682 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1683 1684 if (CXXBaseOrMemberInitializer *Value 1685 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1686 AllToInit.push_back(Value); 1687 } else if (!AnyErrors) { 1688 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1689 CXXBaseOrMemberInitializer *CXXBaseInit; 1690 if (BuildImplicitBaseInitializer(*this, Constructor, ImplicitInitKind, 1691 VBase, IsInheritedVirtualBase, 1692 CXXBaseInit)) { 1693 HadError = true; 1694 continue; 1695 } 1696 1697 AllToInit.push_back(CXXBaseInit); 1698 } 1699 } 1700 1701 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1702 E = ClassDecl->bases_end(); Base != E; ++Base) { 1703 // Virtuals are in the virtual base list and already constructed. 1704 if (Base->isVirtual()) 1705 continue; 1706 1707 if (CXXBaseOrMemberInitializer *Value 1708 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1709 AllToInit.push_back(Value); 1710 } else if (!AnyErrors) { 1711 CXXBaseOrMemberInitializer *CXXBaseInit; 1712 if (BuildImplicitBaseInitializer(*this, Constructor, ImplicitInitKind, 1713 Base, /*IsInheritedVirtualBase=*/false, 1714 CXXBaseInit)) { 1715 HadError = true; 1716 continue; 1717 } 1718 1719 AllToInit.push_back(CXXBaseInit); 1720 } 1721 } 1722 1723 // non-static data members. 1724 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1725 E = ClassDecl->field_end(); Field != E; ++Field) { 1726 if ((*Field)->isAnonymousStructOrUnion()) { 1727 if (const RecordType *FieldClassType = 1728 Field->getType()->getAs<RecordType>()) { 1729 CXXRecordDecl *FieldClassDecl 1730 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1731 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1732 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1733 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1734 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1735 // set to the anonymous union data member used in the initializer 1736 // list. 1737 Value->setMember(*Field); 1738 Value->setAnonUnionMember(*FA); 1739 AllToInit.push_back(Value); 1740 break; 1741 } 1742 } 1743 } 1744 continue; 1745 } 1746 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1747 AllToInit.push_back(Value); 1748 continue; 1749 } 1750 1751 if (AnyErrors) 1752 continue; 1753 1754 CXXBaseOrMemberInitializer *Member; 1755 if (BuildImplicitMemberInitializer(*this, Constructor, ImplicitInitKind, 1756 *Field, Member)) { 1757 HadError = true; 1758 continue; 1759 } 1760 1761 // If the member doesn't need to be initialized, it will be null. 1762 if (Member) 1763 AllToInit.push_back(Member); 1764 } 1765 1766 NumInitializers = AllToInit.size(); 1767 if (NumInitializers > 0) { 1768 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1769 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1770 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1771 memcpy(baseOrMemberInitializers, AllToInit.data(), 1772 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1773 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1774 1775 // Constructors implicitly reference the base and member 1776 // destructors. 1777 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1778 Constructor->getParent()); 1779 } 1780 1781 return HadError; 1782} 1783 1784static void *GetKeyForTopLevelField(FieldDecl *Field) { 1785 // For anonymous unions, use the class declaration as the key. 1786 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1787 if (RT->getDecl()->isAnonymousStructOrUnion()) 1788 return static_cast<void *>(RT->getDecl()); 1789 } 1790 return static_cast<void *>(Field); 1791} 1792 1793static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1794 return Context.getCanonicalType(BaseType).getTypePtr(); 1795} 1796 1797static void *GetKeyForMember(ASTContext &Context, 1798 CXXBaseOrMemberInitializer *Member, 1799 bool MemberMaybeAnon = false) { 1800 if (!Member->isMemberInitializer()) 1801 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1802 1803 // For fields injected into the class via declaration of an anonymous union, 1804 // use its anonymous union class declaration as the unique key. 1805 FieldDecl *Field = Member->getMember(); 1806 1807 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1808 // data member of the class. Data member used in the initializer list is 1809 // in AnonUnionMember field. 1810 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1811 Field = Member->getAnonUnionMember(); 1812 1813 // If the field is a member of an anonymous struct or union, our key 1814 // is the anonymous record decl that's a direct child of the class. 1815 RecordDecl *RD = Field->getParent(); 1816 if (RD->isAnonymousStructOrUnion()) { 1817 while (true) { 1818 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1819 if (Parent->isAnonymousStructOrUnion()) 1820 RD = Parent; 1821 else 1822 break; 1823 } 1824 1825 return static_cast<void *>(RD); 1826 } 1827 1828 return static_cast<void *>(Field); 1829} 1830 1831static void 1832DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1833 const CXXConstructorDecl *Constructor, 1834 CXXBaseOrMemberInitializer **Inits, 1835 unsigned NumInits) { 1836 if (Constructor->getDeclContext()->isDependentContext()) 1837 return; 1838 1839 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1840 == Diagnostic::Ignored) 1841 return; 1842 1843 // Build the list of bases and members in the order that they'll 1844 // actually be initialized. The explicit initializers should be in 1845 // this same order but may be missing things. 1846 llvm::SmallVector<const void*, 32> IdealInitKeys; 1847 1848 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1849 1850 // 1. Virtual bases. 1851 for (CXXRecordDecl::base_class_const_iterator VBase = 1852 ClassDecl->vbases_begin(), 1853 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1854 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 1855 1856 // 2. Non-virtual bases. 1857 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 1858 E = ClassDecl->bases_end(); Base != E; ++Base) { 1859 if (Base->isVirtual()) 1860 continue; 1861 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 1862 } 1863 1864 // 3. Direct fields. 1865 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1866 E = ClassDecl->field_end(); Field != E; ++Field) 1867 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 1868 1869 unsigned NumIdealInits = IdealInitKeys.size(); 1870 unsigned IdealIndex = 0; 1871 1872 CXXBaseOrMemberInitializer *PrevInit = 0; 1873 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 1874 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 1875 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 1876 1877 // Scan forward to try to find this initializer in the idealized 1878 // initializers list. 1879 for (; IdealIndex != NumIdealInits; ++IdealIndex) 1880 if (InitKey == IdealInitKeys[IdealIndex]) 1881 break; 1882 1883 // If we didn't find this initializer, it must be because we 1884 // scanned past it on a previous iteration. That can only 1885 // happen if we're out of order; emit a warning. 1886 if (IdealIndex == NumIdealInits) { 1887 assert(PrevInit && "initializer not found in initializer list"); 1888 1889 Sema::SemaDiagnosticBuilder D = 1890 SemaRef.Diag(PrevInit->getSourceLocation(), 1891 diag::warn_initializer_out_of_order); 1892 1893 if (PrevInit->isMemberInitializer()) 1894 D << 0 << PrevInit->getMember()->getDeclName(); 1895 else 1896 D << 1 << PrevInit->getBaseClassInfo()->getType(); 1897 1898 if (Init->isMemberInitializer()) 1899 D << 0 << Init->getMember()->getDeclName(); 1900 else 1901 D << 1 << Init->getBaseClassInfo()->getType(); 1902 1903 // Move back to the initializer's location in the ideal list. 1904 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 1905 if (InitKey == IdealInitKeys[IdealIndex]) 1906 break; 1907 1908 assert(IdealIndex != NumIdealInits && 1909 "initializer not found in initializer list"); 1910 } 1911 1912 PrevInit = Init; 1913 } 1914} 1915 1916namespace { 1917bool CheckRedundantInit(Sema &S, 1918 CXXBaseOrMemberInitializer *Init, 1919 CXXBaseOrMemberInitializer *&PrevInit) { 1920 if (!PrevInit) { 1921 PrevInit = Init; 1922 return false; 1923 } 1924 1925 if (FieldDecl *Field = Init->getMember()) 1926 S.Diag(Init->getSourceLocation(), 1927 diag::err_multiple_mem_initialization) 1928 << Field->getDeclName() 1929 << Init->getSourceRange(); 1930 else { 1931 Type *BaseClass = Init->getBaseClass(); 1932 assert(BaseClass && "neither field nor base"); 1933 S.Diag(Init->getSourceLocation(), 1934 diag::err_multiple_base_initialization) 1935 << QualType(BaseClass, 0) 1936 << Init->getSourceRange(); 1937 } 1938 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 1939 << 0 << PrevInit->getSourceRange(); 1940 1941 return true; 1942} 1943 1944typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 1945typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 1946 1947bool CheckRedundantUnionInit(Sema &S, 1948 CXXBaseOrMemberInitializer *Init, 1949 RedundantUnionMap &Unions) { 1950 FieldDecl *Field = Init->getMember(); 1951 RecordDecl *Parent = Field->getParent(); 1952 if (!Parent->isAnonymousStructOrUnion()) 1953 return false; 1954 1955 NamedDecl *Child = Field; 1956 do { 1957 if (Parent->isUnion()) { 1958 UnionEntry &En = Unions[Parent]; 1959 if (En.first && En.first != Child) { 1960 S.Diag(Init->getSourceLocation(), 1961 diag::err_multiple_mem_union_initialization) 1962 << Field->getDeclName() 1963 << Init->getSourceRange(); 1964 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 1965 << 0 << En.second->getSourceRange(); 1966 return true; 1967 } else if (!En.first) { 1968 En.first = Child; 1969 En.second = Init; 1970 } 1971 } 1972 1973 Child = Parent; 1974 Parent = cast<RecordDecl>(Parent->getDeclContext()); 1975 } while (Parent->isAnonymousStructOrUnion()); 1976 1977 return false; 1978} 1979} 1980 1981/// ActOnMemInitializers - Handle the member initializers for a constructor. 1982void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1983 SourceLocation ColonLoc, 1984 MemInitTy **meminits, unsigned NumMemInits, 1985 bool AnyErrors) { 1986 if (!ConstructorDecl) 1987 return; 1988 1989 AdjustDeclIfTemplate(ConstructorDecl); 1990 1991 CXXConstructorDecl *Constructor 1992 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1993 1994 if (!Constructor) { 1995 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1996 return; 1997 } 1998 1999 CXXBaseOrMemberInitializer **MemInits = 2000 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2001 2002 // Mapping for the duplicate initializers check. 2003 // For member initializers, this is keyed with a FieldDecl*. 2004 // For base initializers, this is keyed with a Type*. 2005 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2006 2007 // Mapping for the inconsistent anonymous-union initializers check. 2008 RedundantUnionMap MemberUnions; 2009 2010 bool HadError = false; 2011 for (unsigned i = 0; i < NumMemInits; i++) { 2012 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2013 2014 if (Init->isMemberInitializer()) { 2015 FieldDecl *Field = Init->getMember(); 2016 if (CheckRedundantInit(*this, Init, Members[Field]) || 2017 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2018 HadError = true; 2019 } else { 2020 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2021 if (CheckRedundantInit(*this, Init, Members[Key])) 2022 HadError = true; 2023 } 2024 } 2025 2026 if (HadError) 2027 return; 2028 2029 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2030 2031 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2032} 2033 2034void 2035Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2036 CXXRecordDecl *ClassDecl) { 2037 // Ignore dependent contexts. 2038 if (ClassDecl->isDependentContext()) 2039 return; 2040 2041 // FIXME: all the access-control diagnostics are positioned on the 2042 // field/base declaration. That's probably good; that said, the 2043 // user might reasonably want to know why the destructor is being 2044 // emitted, and we currently don't say. 2045 2046 // Non-static data members. 2047 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2048 E = ClassDecl->field_end(); I != E; ++I) { 2049 FieldDecl *Field = *I; 2050 2051 QualType FieldType = Context.getBaseElementType(Field->getType()); 2052 2053 const RecordType* RT = FieldType->getAs<RecordType>(); 2054 if (!RT) 2055 continue; 2056 2057 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2058 if (FieldClassDecl->hasTrivialDestructor()) 2059 continue; 2060 2061 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 2062 CheckDestructorAccess(Field->getLocation(), Dtor, 2063 PDiag(diag::err_access_dtor_field) 2064 << Field->getDeclName() 2065 << FieldType); 2066 2067 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2068 } 2069 2070 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2071 2072 // Bases. 2073 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2074 E = ClassDecl->bases_end(); Base != E; ++Base) { 2075 // Bases are always records in a well-formed non-dependent class. 2076 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2077 2078 // Remember direct virtual bases. 2079 if (Base->isVirtual()) 2080 DirectVirtualBases.insert(RT); 2081 2082 // Ignore trivial destructors. 2083 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2084 if (BaseClassDecl->hasTrivialDestructor()) 2085 continue; 2086 2087 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2088 2089 // FIXME: caret should be on the start of the class name 2090 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2091 PDiag(diag::err_access_dtor_base) 2092 << Base->getType() 2093 << Base->getSourceRange()); 2094 2095 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2096 } 2097 2098 // Virtual bases. 2099 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2100 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2101 2102 // Bases are always records in a well-formed non-dependent class. 2103 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2104 2105 // Ignore direct virtual bases. 2106 if (DirectVirtualBases.count(RT)) 2107 continue; 2108 2109 // Ignore trivial destructors. 2110 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2111 if (BaseClassDecl->hasTrivialDestructor()) 2112 continue; 2113 2114 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2115 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2116 PDiag(diag::err_access_dtor_vbase) 2117 << VBase->getType()); 2118 2119 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2120 } 2121} 2122 2123void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2124 if (!CDtorDecl) 2125 return; 2126 2127 if (CXXConstructorDecl *Constructor 2128 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2129 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2130} 2131 2132bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2133 unsigned DiagID, AbstractDiagSelID SelID, 2134 const CXXRecordDecl *CurrentRD) { 2135 if (SelID == -1) 2136 return RequireNonAbstractType(Loc, T, 2137 PDiag(DiagID), CurrentRD); 2138 else 2139 return RequireNonAbstractType(Loc, T, 2140 PDiag(DiagID) << SelID, CurrentRD); 2141} 2142 2143bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2144 const PartialDiagnostic &PD, 2145 const CXXRecordDecl *CurrentRD) { 2146 if (!getLangOptions().CPlusPlus) 2147 return false; 2148 2149 if (const ArrayType *AT = Context.getAsArrayType(T)) 2150 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2151 CurrentRD); 2152 2153 if (const PointerType *PT = T->getAs<PointerType>()) { 2154 // Find the innermost pointer type. 2155 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2156 PT = T; 2157 2158 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2159 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2160 } 2161 2162 const RecordType *RT = T->getAs<RecordType>(); 2163 if (!RT) 2164 return false; 2165 2166 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2167 2168 if (CurrentRD && CurrentRD != RD) 2169 return false; 2170 2171 // FIXME: is this reasonable? It matches current behavior, but.... 2172 if (!RD->getDefinition()) 2173 return false; 2174 2175 if (!RD->isAbstract()) 2176 return false; 2177 2178 Diag(Loc, PD) << RD->getDeclName(); 2179 2180 // Check if we've already emitted the list of pure virtual functions for this 2181 // class. 2182 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2183 return true; 2184 2185 CXXFinalOverriderMap FinalOverriders; 2186 RD->getFinalOverriders(FinalOverriders); 2187 2188 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2189 MEnd = FinalOverriders.end(); 2190 M != MEnd; 2191 ++M) { 2192 for (OverridingMethods::iterator SO = M->second.begin(), 2193 SOEnd = M->second.end(); 2194 SO != SOEnd; ++SO) { 2195 // C++ [class.abstract]p4: 2196 // A class is abstract if it contains or inherits at least one 2197 // pure virtual function for which the final overrider is pure 2198 // virtual. 2199 2200 // 2201 if (SO->second.size() != 1) 2202 continue; 2203 2204 if (!SO->second.front().Method->isPure()) 2205 continue; 2206 2207 Diag(SO->second.front().Method->getLocation(), 2208 diag::note_pure_virtual_function) 2209 << SO->second.front().Method->getDeclName(); 2210 } 2211 } 2212 2213 if (!PureVirtualClassDiagSet) 2214 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2215 PureVirtualClassDiagSet->insert(RD); 2216 2217 return true; 2218} 2219 2220namespace { 2221 class AbstractClassUsageDiagnoser 2222 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2223 Sema &SemaRef; 2224 CXXRecordDecl *AbstractClass; 2225 2226 bool VisitDeclContext(const DeclContext *DC) { 2227 bool Invalid = false; 2228 2229 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2230 E = DC->decls_end(); I != E; ++I) 2231 Invalid |= Visit(*I); 2232 2233 return Invalid; 2234 } 2235 2236 public: 2237 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2238 : SemaRef(SemaRef), AbstractClass(ac) { 2239 Visit(SemaRef.Context.getTranslationUnitDecl()); 2240 } 2241 2242 bool VisitFunctionDecl(const FunctionDecl *FD) { 2243 if (FD->isThisDeclarationADefinition()) { 2244 // No need to do the check if we're in a definition, because it requires 2245 // that the return/param types are complete. 2246 // because that requires 2247 return VisitDeclContext(FD); 2248 } 2249 2250 // Check the return type. 2251 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2252 bool Invalid = 2253 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2254 diag::err_abstract_type_in_decl, 2255 Sema::AbstractReturnType, 2256 AbstractClass); 2257 2258 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2259 E = FD->param_end(); I != E; ++I) { 2260 const ParmVarDecl *VD = *I; 2261 Invalid |= 2262 SemaRef.RequireNonAbstractType(VD->getLocation(), 2263 VD->getOriginalType(), 2264 diag::err_abstract_type_in_decl, 2265 Sema::AbstractParamType, 2266 AbstractClass); 2267 } 2268 2269 return Invalid; 2270 } 2271 2272 bool VisitDecl(const Decl* D) { 2273 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2274 return VisitDeclContext(DC); 2275 2276 return false; 2277 } 2278 }; 2279} 2280 2281/// \brief Perform semantic checks on a class definition that has been 2282/// completing, introducing implicitly-declared members, checking for 2283/// abstract types, etc. 2284void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) { 2285 if (!Record || Record->isInvalidDecl()) 2286 return; 2287 2288 if (!Record->isDependentType()) 2289 AddImplicitlyDeclaredMembersToClass(S, Record); 2290 2291 if (Record->isInvalidDecl()) 2292 return; 2293 2294 // Set access bits correctly on the directly-declared conversions. 2295 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2296 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2297 Convs->setAccess(I, (*I)->getAccess()); 2298 2299 // Determine whether we need to check for final overriders. We do 2300 // this either when there are virtual base classes (in which case we 2301 // may end up finding multiple final overriders for a given virtual 2302 // function) or any of the base classes is abstract (in which case 2303 // we might detect that this class is abstract). 2304 bool CheckFinalOverriders = false; 2305 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2306 !Record->isDependentType()) { 2307 if (Record->getNumVBases()) 2308 CheckFinalOverriders = true; 2309 else if (!Record->isAbstract()) { 2310 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2311 BEnd = Record->bases_end(); 2312 B != BEnd; ++B) { 2313 CXXRecordDecl *BaseDecl 2314 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2315 if (BaseDecl->isAbstract()) { 2316 CheckFinalOverriders = true; 2317 break; 2318 } 2319 } 2320 } 2321 } 2322 2323 if (CheckFinalOverriders) { 2324 CXXFinalOverriderMap FinalOverriders; 2325 Record->getFinalOverriders(FinalOverriders); 2326 2327 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2328 MEnd = FinalOverriders.end(); 2329 M != MEnd; ++M) { 2330 for (OverridingMethods::iterator SO = M->second.begin(), 2331 SOEnd = M->second.end(); 2332 SO != SOEnd; ++SO) { 2333 assert(SO->second.size() > 0 && 2334 "All virtual functions have overridding virtual functions"); 2335 if (SO->second.size() == 1) { 2336 // C++ [class.abstract]p4: 2337 // A class is abstract if it contains or inherits at least one 2338 // pure virtual function for which the final overrider is pure 2339 // virtual. 2340 if (SO->second.front().Method->isPure()) 2341 Record->setAbstract(true); 2342 continue; 2343 } 2344 2345 // C++ [class.virtual]p2: 2346 // In a derived class, if a virtual member function of a base 2347 // class subobject has more than one final overrider the 2348 // program is ill-formed. 2349 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2350 << (NamedDecl *)M->first << Record; 2351 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2352 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2353 OMEnd = SO->second.end(); 2354 OM != OMEnd; ++OM) 2355 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2356 << (NamedDecl *)M->first << OM->Method->getParent(); 2357 2358 Record->setInvalidDecl(); 2359 } 2360 } 2361 } 2362 2363 if (Record->isAbstract() && !Record->isInvalidDecl()) 2364 (void)AbstractClassUsageDiagnoser(*this, Record); 2365 2366 // If this is not an aggregate type and has no user-declared constructor, 2367 // complain about any non-static data members of reference or const scalar 2368 // type, since they will never get initializers. 2369 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2370 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2371 bool Complained = false; 2372 for (RecordDecl::field_iterator F = Record->field_begin(), 2373 FEnd = Record->field_end(); 2374 F != FEnd; ++F) { 2375 if (F->getType()->isReferenceType() || 2376 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2377 if (!Complained) { 2378 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2379 << Record->getTagKind() << Record; 2380 Complained = true; 2381 } 2382 2383 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2384 << F->getType()->isReferenceType() 2385 << F->getDeclName(); 2386 } 2387 } 2388 } 2389} 2390 2391void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2392 DeclPtrTy TagDecl, 2393 SourceLocation LBrac, 2394 SourceLocation RBrac, 2395 AttributeList *AttrList) { 2396 if (!TagDecl) 2397 return; 2398 2399 AdjustDeclIfTemplate(TagDecl); 2400 2401 ActOnFields(S, RLoc, TagDecl, 2402 (DeclPtrTy*)FieldCollector->getCurFields(), 2403 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2404 2405 CheckCompletedCXXClass(S, 2406 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2407} 2408 2409/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2410/// special functions, such as the default constructor, copy 2411/// constructor, or destructor, to the given C++ class (C++ 2412/// [special]p1). This routine can only be executed just before the 2413/// definition of the class is complete. 2414/// 2415/// The scope, if provided, is the class scope. 2416void Sema::AddImplicitlyDeclaredMembersToClass(Scope *S, 2417 CXXRecordDecl *ClassDecl) { 2418 CanQualType ClassType 2419 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2420 2421 // FIXME: Implicit declarations have exception specifications, which are 2422 // the union of the specifications of the implicitly called functions. 2423 2424 if (!ClassDecl->hasUserDeclaredConstructor()) { 2425 // C++ [class.ctor]p5: 2426 // A default constructor for a class X is a constructor of class X 2427 // that can be called without an argument. If there is no 2428 // user-declared constructor for class X, a default constructor is 2429 // implicitly declared. An implicitly-declared default constructor 2430 // is an inline public member of its class. 2431 DeclarationName Name 2432 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2433 CXXConstructorDecl *DefaultCon = 2434 CXXConstructorDecl::Create(Context, ClassDecl, 2435 ClassDecl->getLocation(), Name, 2436 Context.getFunctionType(Context.VoidTy, 2437 0, 0, false, 0, 2438 /*FIXME*/false, false, 2439 0, 0, 2440 FunctionType::ExtInfo()), 2441 /*TInfo=*/0, 2442 /*isExplicit=*/false, 2443 /*isInline=*/true, 2444 /*isImplicitlyDeclared=*/true); 2445 DefaultCon->setAccess(AS_public); 2446 DefaultCon->setImplicit(); 2447 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2448 if (S) 2449 PushOnScopeChains(DefaultCon, S, true); 2450 else 2451 ClassDecl->addDecl(DefaultCon); 2452 } 2453 2454 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2455 // C++ [class.copy]p4: 2456 // If the class definition does not explicitly declare a copy 2457 // constructor, one is declared implicitly. 2458 2459 // C++ [class.copy]p5: 2460 // The implicitly-declared copy constructor for a class X will 2461 // have the form 2462 // 2463 // X::X(const X&) 2464 // 2465 // if 2466 bool HasConstCopyConstructor = true; 2467 2468 // -- each direct or virtual base class B of X has a copy 2469 // constructor whose first parameter is of type const B& or 2470 // const volatile B&, and 2471 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2472 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2473 const CXXRecordDecl *BaseClassDecl 2474 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2475 HasConstCopyConstructor 2476 = BaseClassDecl->hasConstCopyConstructor(Context); 2477 } 2478 2479 // -- for all the nonstatic data members of X that are of a 2480 // class type M (or array thereof), each such class type 2481 // has a copy constructor whose first parameter is of type 2482 // const M& or const volatile M&. 2483 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2484 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2485 ++Field) { 2486 QualType FieldType = (*Field)->getType(); 2487 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2488 FieldType = Array->getElementType(); 2489 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2490 const CXXRecordDecl *FieldClassDecl 2491 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2492 HasConstCopyConstructor 2493 = FieldClassDecl->hasConstCopyConstructor(Context); 2494 } 2495 } 2496 2497 // Otherwise, the implicitly declared copy constructor will have 2498 // the form 2499 // 2500 // X::X(X&) 2501 QualType ArgType = ClassType; 2502 if (HasConstCopyConstructor) 2503 ArgType = ArgType.withConst(); 2504 ArgType = Context.getLValueReferenceType(ArgType); 2505 2506 // An implicitly-declared copy constructor is an inline public 2507 // member of its class. 2508 DeclarationName Name 2509 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2510 CXXConstructorDecl *CopyConstructor 2511 = CXXConstructorDecl::Create(Context, ClassDecl, 2512 ClassDecl->getLocation(), Name, 2513 Context.getFunctionType(Context.VoidTy, 2514 &ArgType, 1, 2515 false, 0, 2516 /*FIXME:*/false, 2517 false, 0, 0, 2518 FunctionType::ExtInfo()), 2519 /*TInfo=*/0, 2520 /*isExplicit=*/false, 2521 /*isInline=*/true, 2522 /*isImplicitlyDeclared=*/true); 2523 CopyConstructor->setAccess(AS_public); 2524 CopyConstructor->setImplicit(); 2525 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2526 2527 // Add the parameter to the constructor. 2528 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2529 ClassDecl->getLocation(), 2530 /*IdentifierInfo=*/0, 2531 ArgType, /*TInfo=*/0, 2532 VarDecl::None, 2533 VarDecl::None, 0); 2534 CopyConstructor->setParams(&FromParam, 1); 2535 if (S) 2536 PushOnScopeChains(CopyConstructor, S, true); 2537 else 2538 ClassDecl->addDecl(CopyConstructor); 2539 } 2540 2541 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2542 // Note: The following rules are largely analoguous to the copy 2543 // constructor rules. Note that virtual bases are not taken into account 2544 // for determining the argument type of the operator. Note also that 2545 // operators taking an object instead of a reference are allowed. 2546 // 2547 // C++ [class.copy]p10: 2548 // If the class definition does not explicitly declare a copy 2549 // assignment operator, one is declared implicitly. 2550 // The implicitly-defined copy assignment operator for a class X 2551 // will have the form 2552 // 2553 // X& X::operator=(const X&) 2554 // 2555 // if 2556 bool HasConstCopyAssignment = true; 2557 2558 // -- each direct base class B of X has a copy assignment operator 2559 // whose parameter is of type const B&, const volatile B& or B, 2560 // and 2561 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2562 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2563 assert(!Base->getType()->isDependentType() && 2564 "Cannot generate implicit members for class with dependent bases."); 2565 const CXXRecordDecl *BaseClassDecl 2566 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2567 const CXXMethodDecl *MD = 0; 2568 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2569 MD); 2570 } 2571 2572 // -- for all the nonstatic data members of X that are of a class 2573 // type M (or array thereof), each such class type has a copy 2574 // assignment operator whose parameter is of type const M&, 2575 // const volatile M& or M. 2576 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2577 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2578 ++Field) { 2579 QualType FieldType = (*Field)->getType(); 2580 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2581 FieldType = Array->getElementType(); 2582 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2583 const CXXRecordDecl *FieldClassDecl 2584 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2585 const CXXMethodDecl *MD = 0; 2586 HasConstCopyAssignment 2587 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2588 } 2589 } 2590 2591 // Otherwise, the implicitly declared copy assignment operator will 2592 // have the form 2593 // 2594 // X& X::operator=(X&) 2595 QualType ArgType = ClassType; 2596 QualType RetType = Context.getLValueReferenceType(ArgType); 2597 if (HasConstCopyAssignment) 2598 ArgType = ArgType.withConst(); 2599 ArgType = Context.getLValueReferenceType(ArgType); 2600 2601 // An implicitly-declared copy assignment operator is an inline public 2602 // member of its class. 2603 DeclarationName Name = 2604 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2605 CXXMethodDecl *CopyAssignment = 2606 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2607 Context.getFunctionType(RetType, &ArgType, 1, 2608 false, 0, 2609 /*FIXME:*/false, 2610 false, 0, 0, 2611 FunctionType::ExtInfo()), 2612 /*TInfo=*/0, /*isStatic=*/false, 2613 /*StorageClassAsWritten=*/FunctionDecl::None, 2614 /*isInline=*/true); 2615 CopyAssignment->setAccess(AS_public); 2616 CopyAssignment->setImplicit(); 2617 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2618 CopyAssignment->setCopyAssignment(true); 2619 2620 // Add the parameter to the operator. 2621 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2622 ClassDecl->getLocation(), 2623 /*IdentifierInfo=*/0, 2624 ArgType, /*TInfo=*/0, 2625 VarDecl::None, 2626 VarDecl::None, 0); 2627 CopyAssignment->setParams(&FromParam, 1); 2628 2629 // Don't call addedAssignmentOperator. There is no way to distinguish an 2630 // implicit from an explicit assignment operator. 2631 if (S) 2632 PushOnScopeChains(CopyAssignment, S, true); 2633 else 2634 ClassDecl->addDecl(CopyAssignment); 2635 AddOverriddenMethods(ClassDecl, CopyAssignment); 2636 } 2637 2638 if (!ClassDecl->hasUserDeclaredDestructor()) { 2639 // C++ [class.dtor]p2: 2640 // If a class has no user-declared destructor, a destructor is 2641 // declared implicitly. An implicitly-declared destructor is an 2642 // inline public member of its class. 2643 QualType Ty = Context.getFunctionType(Context.VoidTy, 2644 0, 0, false, 0, 2645 /*FIXME:*/false, 2646 false, 0, 0, FunctionType::ExtInfo()); 2647 2648 DeclarationName Name 2649 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2650 CXXDestructorDecl *Destructor 2651 = CXXDestructorDecl::Create(Context, ClassDecl, 2652 ClassDecl->getLocation(), Name, Ty, 2653 /*isInline=*/true, 2654 /*isImplicitlyDeclared=*/true); 2655 Destructor->setAccess(AS_public); 2656 Destructor->setImplicit(); 2657 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2658 if (S) 2659 PushOnScopeChains(Destructor, S, true); 2660 else 2661 ClassDecl->addDecl(Destructor); 2662 2663 // This could be uniqued if it ever proves significant. 2664 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2665 2666 AddOverriddenMethods(ClassDecl, Destructor); 2667 } 2668} 2669 2670void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2671 Decl *D = TemplateD.getAs<Decl>(); 2672 if (!D) 2673 return; 2674 2675 TemplateParameterList *Params = 0; 2676 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2677 Params = Template->getTemplateParameters(); 2678 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2679 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2680 Params = PartialSpec->getTemplateParameters(); 2681 else 2682 return; 2683 2684 for (TemplateParameterList::iterator Param = Params->begin(), 2685 ParamEnd = Params->end(); 2686 Param != ParamEnd; ++Param) { 2687 NamedDecl *Named = cast<NamedDecl>(*Param); 2688 if (Named->getDeclName()) { 2689 S->AddDecl(DeclPtrTy::make(Named)); 2690 IdResolver.AddDecl(Named); 2691 } 2692 } 2693} 2694 2695void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2696 if (!RecordD) return; 2697 AdjustDeclIfTemplate(RecordD); 2698 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2699 PushDeclContext(S, Record); 2700} 2701 2702void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2703 if (!RecordD) return; 2704 PopDeclContext(); 2705} 2706 2707/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2708/// parsing a top-level (non-nested) C++ class, and we are now 2709/// parsing those parts of the given Method declaration that could 2710/// not be parsed earlier (C++ [class.mem]p2), such as default 2711/// arguments. This action should enter the scope of the given 2712/// Method declaration as if we had just parsed the qualified method 2713/// name. However, it should not bring the parameters into scope; 2714/// that will be performed by ActOnDelayedCXXMethodParameter. 2715void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2716} 2717 2718/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2719/// C++ method declaration. We're (re-)introducing the given 2720/// function parameter into scope for use in parsing later parts of 2721/// the method declaration. For example, we could see an 2722/// ActOnParamDefaultArgument event for this parameter. 2723void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2724 if (!ParamD) 2725 return; 2726 2727 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2728 2729 // If this parameter has an unparsed default argument, clear it out 2730 // to make way for the parsed default argument. 2731 if (Param->hasUnparsedDefaultArg()) 2732 Param->setDefaultArg(0); 2733 2734 S->AddDecl(DeclPtrTy::make(Param)); 2735 if (Param->getDeclName()) 2736 IdResolver.AddDecl(Param); 2737} 2738 2739/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2740/// processing the delayed method declaration for Method. The method 2741/// declaration is now considered finished. There may be a separate 2742/// ActOnStartOfFunctionDef action later (not necessarily 2743/// immediately!) for this method, if it was also defined inside the 2744/// class body. 2745void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2746 if (!MethodD) 2747 return; 2748 2749 AdjustDeclIfTemplate(MethodD); 2750 2751 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2752 2753 // Now that we have our default arguments, check the constructor 2754 // again. It could produce additional diagnostics or affect whether 2755 // the class has implicitly-declared destructors, among other 2756 // things. 2757 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2758 CheckConstructor(Constructor); 2759 2760 // Check the default arguments, which we may have added. 2761 if (!Method->isInvalidDecl()) 2762 CheckCXXDefaultArguments(Method); 2763} 2764 2765/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2766/// the well-formedness of the constructor declarator @p D with type @p 2767/// R. If there are any errors in the declarator, this routine will 2768/// emit diagnostics and set the invalid bit to true. In any case, the type 2769/// will be updated to reflect a well-formed type for the constructor and 2770/// returned. 2771QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2772 FunctionDecl::StorageClass &SC) { 2773 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2774 2775 // C++ [class.ctor]p3: 2776 // A constructor shall not be virtual (10.3) or static (9.4). A 2777 // constructor can be invoked for a const, volatile or const 2778 // volatile object. A constructor shall not be declared const, 2779 // volatile, or const volatile (9.3.2). 2780 if (isVirtual) { 2781 if (!D.isInvalidType()) 2782 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2783 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2784 << SourceRange(D.getIdentifierLoc()); 2785 D.setInvalidType(); 2786 } 2787 if (SC == FunctionDecl::Static) { 2788 if (!D.isInvalidType()) 2789 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2790 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2791 << SourceRange(D.getIdentifierLoc()); 2792 D.setInvalidType(); 2793 SC = FunctionDecl::None; 2794 } 2795 2796 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2797 if (FTI.TypeQuals != 0) { 2798 if (FTI.TypeQuals & Qualifiers::Const) 2799 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2800 << "const" << SourceRange(D.getIdentifierLoc()); 2801 if (FTI.TypeQuals & Qualifiers::Volatile) 2802 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2803 << "volatile" << SourceRange(D.getIdentifierLoc()); 2804 if (FTI.TypeQuals & Qualifiers::Restrict) 2805 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2806 << "restrict" << SourceRange(D.getIdentifierLoc()); 2807 } 2808 2809 // Rebuild the function type "R" without any type qualifiers (in 2810 // case any of the errors above fired) and with "void" as the 2811 // return type, since constructors don't have return types. We 2812 // *always* have to do this, because GetTypeForDeclarator will 2813 // put in a result type of "int" when none was specified. 2814 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2815 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2816 Proto->getNumArgs(), 2817 Proto->isVariadic(), 0, 2818 Proto->hasExceptionSpec(), 2819 Proto->hasAnyExceptionSpec(), 2820 Proto->getNumExceptions(), 2821 Proto->exception_begin(), 2822 Proto->getExtInfo()); 2823} 2824 2825/// CheckConstructor - Checks a fully-formed constructor for 2826/// well-formedness, issuing any diagnostics required. Returns true if 2827/// the constructor declarator is invalid. 2828void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2829 CXXRecordDecl *ClassDecl 2830 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2831 if (!ClassDecl) 2832 return Constructor->setInvalidDecl(); 2833 2834 // C++ [class.copy]p3: 2835 // A declaration of a constructor for a class X is ill-formed if 2836 // its first parameter is of type (optionally cv-qualified) X and 2837 // either there are no other parameters or else all other 2838 // parameters have default arguments. 2839 if (!Constructor->isInvalidDecl() && 2840 ((Constructor->getNumParams() == 1) || 2841 (Constructor->getNumParams() > 1 && 2842 Constructor->getParamDecl(1)->hasDefaultArg())) && 2843 Constructor->getTemplateSpecializationKind() 2844 != TSK_ImplicitInstantiation) { 2845 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2846 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2847 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2848 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2849 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2850 << FixItHint::CreateInsertion(ParamLoc, " const &"); 2851 2852 // FIXME: Rather that making the constructor invalid, we should endeavor 2853 // to fix the type. 2854 Constructor->setInvalidDecl(); 2855 } 2856 } 2857 2858 // Notify the class that we've added a constructor. In principle we 2859 // don't need to do this for out-of-line declarations; in practice 2860 // we only instantiate the most recent declaration of a method, so 2861 // we have to call this for everything but friends. 2862 if (!Constructor->getFriendObjectKind()) 2863 ClassDecl->addedConstructor(Context, Constructor); 2864} 2865 2866/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2867/// issuing any diagnostics required. Returns true on error. 2868bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2869 CXXRecordDecl *RD = Destructor->getParent(); 2870 2871 if (Destructor->isVirtual()) { 2872 SourceLocation Loc; 2873 2874 if (!Destructor->isImplicit()) 2875 Loc = Destructor->getLocation(); 2876 else 2877 Loc = RD->getLocation(); 2878 2879 // If we have a virtual destructor, look up the deallocation function 2880 FunctionDecl *OperatorDelete = 0; 2881 DeclarationName Name = 2882 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2883 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2884 return true; 2885 2886 Destructor->setOperatorDelete(OperatorDelete); 2887 } 2888 2889 return false; 2890} 2891 2892static inline bool 2893FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2894 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2895 FTI.ArgInfo[0].Param && 2896 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2897} 2898 2899/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2900/// the well-formednes of the destructor declarator @p D with type @p 2901/// R. If there are any errors in the declarator, this routine will 2902/// emit diagnostics and set the declarator to invalid. Even if this happens, 2903/// will be updated to reflect a well-formed type for the destructor and 2904/// returned. 2905QualType Sema::CheckDestructorDeclarator(Declarator &D, 2906 FunctionDecl::StorageClass& SC) { 2907 // C++ [class.dtor]p1: 2908 // [...] A typedef-name that names a class is a class-name 2909 // (7.1.3); however, a typedef-name that names a class shall not 2910 // be used as the identifier in the declarator for a destructor 2911 // declaration. 2912 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2913 if (isa<TypedefType>(DeclaratorType)) { 2914 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2915 << DeclaratorType; 2916 D.setInvalidType(); 2917 } 2918 2919 // C++ [class.dtor]p2: 2920 // A destructor is used to destroy objects of its class type. A 2921 // destructor takes no parameters, and no return type can be 2922 // specified for it (not even void). The address of a destructor 2923 // shall not be taken. A destructor shall not be static. A 2924 // destructor can be invoked for a const, volatile or const 2925 // volatile object. A destructor shall not be declared const, 2926 // volatile or const volatile (9.3.2). 2927 if (SC == FunctionDecl::Static) { 2928 if (!D.isInvalidType()) 2929 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2930 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2931 << SourceRange(D.getIdentifierLoc()); 2932 SC = FunctionDecl::None; 2933 D.setInvalidType(); 2934 } 2935 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2936 // Destructors don't have return types, but the parser will 2937 // happily parse something like: 2938 // 2939 // class X { 2940 // float ~X(); 2941 // }; 2942 // 2943 // The return type will be eliminated later. 2944 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2945 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2946 << SourceRange(D.getIdentifierLoc()); 2947 } 2948 2949 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2950 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2951 if (FTI.TypeQuals & Qualifiers::Const) 2952 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2953 << "const" << SourceRange(D.getIdentifierLoc()); 2954 if (FTI.TypeQuals & Qualifiers::Volatile) 2955 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2956 << "volatile" << SourceRange(D.getIdentifierLoc()); 2957 if (FTI.TypeQuals & Qualifiers::Restrict) 2958 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2959 << "restrict" << SourceRange(D.getIdentifierLoc()); 2960 D.setInvalidType(); 2961 } 2962 2963 // Make sure we don't have any parameters. 2964 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2965 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2966 2967 // Delete the parameters. 2968 FTI.freeArgs(); 2969 D.setInvalidType(); 2970 } 2971 2972 // Make sure the destructor isn't variadic. 2973 if (FTI.isVariadic) { 2974 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2975 D.setInvalidType(); 2976 } 2977 2978 // Rebuild the function type "R" without any type qualifiers or 2979 // parameters (in case any of the errors above fired) and with 2980 // "void" as the return type, since destructors don't have return 2981 // types. We *always* have to do this, because GetTypeForDeclarator 2982 // will put in a result type of "int" when none was specified. 2983 // FIXME: Exceptions! 2984 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 2985 false, false, 0, 0, FunctionType::ExtInfo()); 2986} 2987 2988/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2989/// well-formednes of the conversion function declarator @p D with 2990/// type @p R. If there are any errors in the declarator, this routine 2991/// will emit diagnostics and return true. Otherwise, it will return 2992/// false. Either way, the type @p R will be updated to reflect a 2993/// well-formed type for the conversion operator. 2994void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2995 FunctionDecl::StorageClass& SC) { 2996 // C++ [class.conv.fct]p1: 2997 // Neither parameter types nor return type can be specified. The 2998 // type of a conversion function (8.3.5) is "function taking no 2999 // parameter returning conversion-type-id." 3000 if (SC == FunctionDecl::Static) { 3001 if (!D.isInvalidType()) 3002 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3003 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3004 << SourceRange(D.getIdentifierLoc()); 3005 D.setInvalidType(); 3006 SC = FunctionDecl::None; 3007 } 3008 3009 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3010 3011 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3012 // Conversion functions don't have return types, but the parser will 3013 // happily parse something like: 3014 // 3015 // class X { 3016 // float operator bool(); 3017 // }; 3018 // 3019 // The return type will be changed later anyway. 3020 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3021 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3022 << SourceRange(D.getIdentifierLoc()); 3023 D.setInvalidType(); 3024 } 3025 3026 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3027 3028 // Make sure we don't have any parameters. 3029 if (Proto->getNumArgs() > 0) { 3030 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3031 3032 // Delete the parameters. 3033 D.getTypeObject(0).Fun.freeArgs(); 3034 D.setInvalidType(); 3035 } else if (Proto->isVariadic()) { 3036 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3037 D.setInvalidType(); 3038 } 3039 3040 // Diagnose "&operator bool()" and other such nonsense. This 3041 // is actually a gcc extension which we don't support. 3042 if (Proto->getResultType() != ConvType) { 3043 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3044 << Proto->getResultType(); 3045 D.setInvalidType(); 3046 ConvType = Proto->getResultType(); 3047 } 3048 3049 // C++ [class.conv.fct]p4: 3050 // The conversion-type-id shall not represent a function type nor 3051 // an array type. 3052 if (ConvType->isArrayType()) { 3053 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3054 ConvType = Context.getPointerType(ConvType); 3055 D.setInvalidType(); 3056 } else if (ConvType->isFunctionType()) { 3057 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3058 ConvType = Context.getPointerType(ConvType); 3059 D.setInvalidType(); 3060 } 3061 3062 // Rebuild the function type "R" without any parameters (in case any 3063 // of the errors above fired) and with the conversion type as the 3064 // return type. 3065 if (D.isInvalidType()) { 3066 R = Context.getFunctionType(ConvType, 0, 0, false, 3067 Proto->getTypeQuals(), 3068 Proto->hasExceptionSpec(), 3069 Proto->hasAnyExceptionSpec(), 3070 Proto->getNumExceptions(), 3071 Proto->exception_begin(), 3072 Proto->getExtInfo()); 3073 } 3074 3075 // C++0x explicit conversion operators. 3076 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3077 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3078 diag::warn_explicit_conversion_functions) 3079 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3080} 3081 3082/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3083/// the declaration of the given C++ conversion function. This routine 3084/// is responsible for recording the conversion function in the C++ 3085/// class, if possible. 3086Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3087 assert(Conversion && "Expected to receive a conversion function declaration"); 3088 3089 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3090 3091 // Make sure we aren't redeclaring the conversion function. 3092 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3093 3094 // C++ [class.conv.fct]p1: 3095 // [...] A conversion function is never used to convert a 3096 // (possibly cv-qualified) object to the (possibly cv-qualified) 3097 // same object type (or a reference to it), to a (possibly 3098 // cv-qualified) base class of that type (or a reference to it), 3099 // or to (possibly cv-qualified) void. 3100 // FIXME: Suppress this warning if the conversion function ends up being a 3101 // virtual function that overrides a virtual function in a base class. 3102 QualType ClassType 3103 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3104 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3105 ConvType = ConvTypeRef->getPointeeType(); 3106 if (ConvType->isRecordType()) { 3107 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3108 if (ConvType == ClassType) 3109 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3110 << ClassType; 3111 else if (IsDerivedFrom(ClassType, ConvType)) 3112 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3113 << ClassType << ConvType; 3114 } else if (ConvType->isVoidType()) { 3115 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3116 << ClassType << ConvType; 3117 } 3118 3119 if (Conversion->getPrimaryTemplate()) { 3120 // ignore specializations 3121 } else if (Conversion->getPreviousDeclaration()) { 3122 if (FunctionTemplateDecl *ConversionTemplate 3123 = Conversion->getDescribedFunctionTemplate()) { 3124 if (ClassDecl->replaceConversion( 3125 ConversionTemplate->getPreviousDeclaration(), 3126 ConversionTemplate)) 3127 return DeclPtrTy::make(ConversionTemplate); 3128 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3129 Conversion)) 3130 return DeclPtrTy::make(Conversion); 3131 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3132 } else if (FunctionTemplateDecl *ConversionTemplate 3133 = Conversion->getDescribedFunctionTemplate()) 3134 ClassDecl->addConversionFunction(ConversionTemplate); 3135 else 3136 ClassDecl->addConversionFunction(Conversion); 3137 3138 return DeclPtrTy::make(Conversion); 3139} 3140 3141//===----------------------------------------------------------------------===// 3142// Namespace Handling 3143//===----------------------------------------------------------------------===// 3144 3145/// ActOnStartNamespaceDef - This is called at the start of a namespace 3146/// definition. 3147Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3148 SourceLocation IdentLoc, 3149 IdentifierInfo *II, 3150 SourceLocation LBrace, 3151 AttributeList *AttrList) { 3152 NamespaceDecl *Namespc = 3153 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3154 Namespc->setLBracLoc(LBrace); 3155 3156 Scope *DeclRegionScope = NamespcScope->getParent(); 3157 3158 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3159 3160 if (II) { 3161 // C++ [namespace.def]p2: 3162 // The identifier in an original-namespace-definition shall not have been 3163 // previously defined in the declarative region in which the 3164 // original-namespace-definition appears. The identifier in an 3165 // original-namespace-definition is the name of the namespace. Subsequently 3166 // in that declarative region, it is treated as an original-namespace-name. 3167 3168 NamedDecl *PrevDecl 3169 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3170 ForRedeclaration); 3171 3172 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3173 // This is an extended namespace definition. 3174 // Attach this namespace decl to the chain of extended namespace 3175 // definitions. 3176 OrigNS->setNextNamespace(Namespc); 3177 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3178 3179 // Remove the previous declaration from the scope. 3180 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3181 IdResolver.RemoveDecl(OrigNS); 3182 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3183 } 3184 } else if (PrevDecl) { 3185 // This is an invalid name redefinition. 3186 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3187 << Namespc->getDeclName(); 3188 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3189 Namespc->setInvalidDecl(); 3190 // Continue on to push Namespc as current DeclContext and return it. 3191 } else if (II->isStr("std") && 3192 CurContext->getLookupContext()->isTranslationUnit()) { 3193 // This is the first "real" definition of the namespace "std", so update 3194 // our cache of the "std" namespace to point at this definition. 3195 if (StdNamespace) { 3196 // We had already defined a dummy namespace "std". Link this new 3197 // namespace definition to the dummy namespace "std". 3198 StdNamespace->setNextNamespace(Namespc); 3199 StdNamespace->setLocation(IdentLoc); 3200 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 3201 } 3202 3203 // Make our StdNamespace cache point at the first real definition of the 3204 // "std" namespace. 3205 StdNamespace = Namespc; 3206 } 3207 3208 PushOnScopeChains(Namespc, DeclRegionScope); 3209 } else { 3210 // Anonymous namespaces. 3211 assert(Namespc->isAnonymousNamespace()); 3212 3213 // Link the anonymous namespace into its parent. 3214 NamespaceDecl *PrevDecl; 3215 DeclContext *Parent = CurContext->getLookupContext(); 3216 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3217 PrevDecl = TU->getAnonymousNamespace(); 3218 TU->setAnonymousNamespace(Namespc); 3219 } else { 3220 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3221 PrevDecl = ND->getAnonymousNamespace(); 3222 ND->setAnonymousNamespace(Namespc); 3223 } 3224 3225 // Link the anonymous namespace with its previous declaration. 3226 if (PrevDecl) { 3227 assert(PrevDecl->isAnonymousNamespace()); 3228 assert(!PrevDecl->getNextNamespace()); 3229 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3230 PrevDecl->setNextNamespace(Namespc); 3231 } 3232 3233 CurContext->addDecl(Namespc); 3234 3235 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3236 // behaves as if it were replaced by 3237 // namespace unique { /* empty body */ } 3238 // using namespace unique; 3239 // namespace unique { namespace-body } 3240 // where all occurrences of 'unique' in a translation unit are 3241 // replaced by the same identifier and this identifier differs 3242 // from all other identifiers in the entire program. 3243 3244 // We just create the namespace with an empty name and then add an 3245 // implicit using declaration, just like the standard suggests. 3246 // 3247 // CodeGen enforces the "universally unique" aspect by giving all 3248 // declarations semantically contained within an anonymous 3249 // namespace internal linkage. 3250 3251 if (!PrevDecl) { 3252 UsingDirectiveDecl* UD 3253 = UsingDirectiveDecl::Create(Context, CurContext, 3254 /* 'using' */ LBrace, 3255 /* 'namespace' */ SourceLocation(), 3256 /* qualifier */ SourceRange(), 3257 /* NNS */ NULL, 3258 /* identifier */ SourceLocation(), 3259 Namespc, 3260 /* Ancestor */ CurContext); 3261 UD->setImplicit(); 3262 CurContext->addDecl(UD); 3263 } 3264 } 3265 3266 // Although we could have an invalid decl (i.e. the namespace name is a 3267 // redefinition), push it as current DeclContext and try to continue parsing. 3268 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3269 // for the namespace has the declarations that showed up in that particular 3270 // namespace definition. 3271 PushDeclContext(NamespcScope, Namespc); 3272 return DeclPtrTy::make(Namespc); 3273} 3274 3275/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3276/// is a namespace alias, returns the namespace it points to. 3277static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3278 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3279 return AD->getNamespace(); 3280 return dyn_cast_or_null<NamespaceDecl>(D); 3281} 3282 3283/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3284/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3285void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3286 Decl *Dcl = D.getAs<Decl>(); 3287 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3288 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3289 Namespc->setRBracLoc(RBrace); 3290 PopDeclContext(); 3291} 3292 3293Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3294 SourceLocation UsingLoc, 3295 SourceLocation NamespcLoc, 3296 CXXScopeSpec &SS, 3297 SourceLocation IdentLoc, 3298 IdentifierInfo *NamespcName, 3299 AttributeList *AttrList) { 3300 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3301 assert(NamespcName && "Invalid NamespcName."); 3302 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3303 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3304 3305 UsingDirectiveDecl *UDir = 0; 3306 3307 // Lookup namespace name. 3308 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3309 LookupParsedName(R, S, &SS); 3310 if (R.isAmbiguous()) 3311 return DeclPtrTy(); 3312 3313 if (!R.empty()) { 3314 NamedDecl *Named = R.getFoundDecl(); 3315 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3316 && "expected namespace decl"); 3317 // C++ [namespace.udir]p1: 3318 // A using-directive specifies that the names in the nominated 3319 // namespace can be used in the scope in which the 3320 // using-directive appears after the using-directive. During 3321 // unqualified name lookup (3.4.1), the names appear as if they 3322 // were declared in the nearest enclosing namespace which 3323 // contains both the using-directive and the nominated 3324 // namespace. [Note: in this context, "contains" means "contains 3325 // directly or indirectly". ] 3326 3327 // Find enclosing context containing both using-directive and 3328 // nominated namespace. 3329 NamespaceDecl *NS = getNamespaceDecl(Named); 3330 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3331 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3332 CommonAncestor = CommonAncestor->getParent(); 3333 3334 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3335 SS.getRange(), 3336 (NestedNameSpecifier *)SS.getScopeRep(), 3337 IdentLoc, Named, CommonAncestor); 3338 PushUsingDirective(S, UDir); 3339 } else { 3340 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3341 } 3342 3343 // FIXME: We ignore attributes for now. 3344 delete AttrList; 3345 return DeclPtrTy::make(UDir); 3346} 3347 3348void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3349 // If scope has associated entity, then using directive is at namespace 3350 // or translation unit scope. We add UsingDirectiveDecls, into 3351 // it's lookup structure. 3352 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3353 Ctx->addDecl(UDir); 3354 else 3355 // Otherwise it is block-sope. using-directives will affect lookup 3356 // only to the end of scope. 3357 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3358} 3359 3360 3361Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3362 AccessSpecifier AS, 3363 bool HasUsingKeyword, 3364 SourceLocation UsingLoc, 3365 CXXScopeSpec &SS, 3366 UnqualifiedId &Name, 3367 AttributeList *AttrList, 3368 bool IsTypeName, 3369 SourceLocation TypenameLoc) { 3370 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3371 3372 switch (Name.getKind()) { 3373 case UnqualifiedId::IK_Identifier: 3374 case UnqualifiedId::IK_OperatorFunctionId: 3375 case UnqualifiedId::IK_LiteralOperatorId: 3376 case UnqualifiedId::IK_ConversionFunctionId: 3377 break; 3378 3379 case UnqualifiedId::IK_ConstructorName: 3380 case UnqualifiedId::IK_ConstructorTemplateId: 3381 // C++0x inherited constructors. 3382 if (getLangOptions().CPlusPlus0x) break; 3383 3384 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3385 << SS.getRange(); 3386 return DeclPtrTy(); 3387 3388 case UnqualifiedId::IK_DestructorName: 3389 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3390 << SS.getRange(); 3391 return DeclPtrTy(); 3392 3393 case UnqualifiedId::IK_TemplateId: 3394 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3395 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3396 return DeclPtrTy(); 3397 } 3398 3399 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3400 if (!TargetName) 3401 return DeclPtrTy(); 3402 3403 // Warn about using declarations. 3404 // TODO: store that the declaration was written without 'using' and 3405 // talk about access decls instead of using decls in the 3406 // diagnostics. 3407 if (!HasUsingKeyword) { 3408 UsingLoc = Name.getSourceRange().getBegin(); 3409 3410 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3411 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3412 } 3413 3414 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3415 Name.getSourceRange().getBegin(), 3416 TargetName, AttrList, 3417 /* IsInstantiation */ false, 3418 IsTypeName, TypenameLoc); 3419 if (UD) 3420 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3421 3422 return DeclPtrTy::make(UD); 3423} 3424 3425/// Determines whether to create a using shadow decl for a particular 3426/// decl, given the set of decls existing prior to this using lookup. 3427bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3428 const LookupResult &Previous) { 3429 // Diagnose finding a decl which is not from a base class of the 3430 // current class. We do this now because there are cases where this 3431 // function will silently decide not to build a shadow decl, which 3432 // will pre-empt further diagnostics. 3433 // 3434 // We don't need to do this in C++0x because we do the check once on 3435 // the qualifier. 3436 // 3437 // FIXME: diagnose the following if we care enough: 3438 // struct A { int foo; }; 3439 // struct B : A { using A::foo; }; 3440 // template <class T> struct C : A {}; 3441 // template <class T> struct D : C<T> { using B::foo; } // <--- 3442 // This is invalid (during instantiation) in C++03 because B::foo 3443 // resolves to the using decl in B, which is not a base class of D<T>. 3444 // We can't diagnose it immediately because C<T> is an unknown 3445 // specialization. The UsingShadowDecl in D<T> then points directly 3446 // to A::foo, which will look well-formed when we instantiate. 3447 // The right solution is to not collapse the shadow-decl chain. 3448 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3449 DeclContext *OrigDC = Orig->getDeclContext(); 3450 3451 // Handle enums and anonymous structs. 3452 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3453 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3454 while (OrigRec->isAnonymousStructOrUnion()) 3455 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3456 3457 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3458 if (OrigDC == CurContext) { 3459 Diag(Using->getLocation(), 3460 diag::err_using_decl_nested_name_specifier_is_current_class) 3461 << Using->getNestedNameRange(); 3462 Diag(Orig->getLocation(), diag::note_using_decl_target); 3463 return true; 3464 } 3465 3466 Diag(Using->getNestedNameRange().getBegin(), 3467 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3468 << Using->getTargetNestedNameDecl() 3469 << cast<CXXRecordDecl>(CurContext) 3470 << Using->getNestedNameRange(); 3471 Diag(Orig->getLocation(), diag::note_using_decl_target); 3472 return true; 3473 } 3474 } 3475 3476 if (Previous.empty()) return false; 3477 3478 NamedDecl *Target = Orig; 3479 if (isa<UsingShadowDecl>(Target)) 3480 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3481 3482 // If the target happens to be one of the previous declarations, we 3483 // don't have a conflict. 3484 // 3485 // FIXME: but we might be increasing its access, in which case we 3486 // should redeclare it. 3487 NamedDecl *NonTag = 0, *Tag = 0; 3488 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3489 I != E; ++I) { 3490 NamedDecl *D = (*I)->getUnderlyingDecl(); 3491 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3492 return false; 3493 3494 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3495 } 3496 3497 if (Target->isFunctionOrFunctionTemplate()) { 3498 FunctionDecl *FD; 3499 if (isa<FunctionTemplateDecl>(Target)) 3500 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3501 else 3502 FD = cast<FunctionDecl>(Target); 3503 3504 NamedDecl *OldDecl = 0; 3505 switch (CheckOverload(FD, Previous, OldDecl)) { 3506 case Ovl_Overload: 3507 return false; 3508 3509 case Ovl_NonFunction: 3510 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3511 break; 3512 3513 // We found a decl with the exact signature. 3514 case Ovl_Match: 3515 if (isa<UsingShadowDecl>(OldDecl)) { 3516 // Silently ignore the possible conflict. 3517 return false; 3518 } 3519 3520 // If we're in a record, we want to hide the target, so we 3521 // return true (without a diagnostic) to tell the caller not to 3522 // build a shadow decl. 3523 if (CurContext->isRecord()) 3524 return true; 3525 3526 // If we're not in a record, this is an error. 3527 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3528 break; 3529 } 3530 3531 Diag(Target->getLocation(), diag::note_using_decl_target); 3532 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3533 return true; 3534 } 3535 3536 // Target is not a function. 3537 3538 if (isa<TagDecl>(Target)) { 3539 // No conflict between a tag and a non-tag. 3540 if (!Tag) return false; 3541 3542 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3543 Diag(Target->getLocation(), diag::note_using_decl_target); 3544 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3545 return true; 3546 } 3547 3548 // No conflict between a tag and a non-tag. 3549 if (!NonTag) return false; 3550 3551 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3552 Diag(Target->getLocation(), diag::note_using_decl_target); 3553 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3554 return true; 3555} 3556 3557/// Builds a shadow declaration corresponding to a 'using' declaration. 3558UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3559 UsingDecl *UD, 3560 NamedDecl *Orig) { 3561 3562 // If we resolved to another shadow declaration, just coalesce them. 3563 NamedDecl *Target = Orig; 3564 if (isa<UsingShadowDecl>(Target)) { 3565 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3566 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3567 } 3568 3569 UsingShadowDecl *Shadow 3570 = UsingShadowDecl::Create(Context, CurContext, 3571 UD->getLocation(), UD, Target); 3572 UD->addShadowDecl(Shadow); 3573 3574 if (S) 3575 PushOnScopeChains(Shadow, S); 3576 else 3577 CurContext->addDecl(Shadow); 3578 Shadow->setAccess(UD->getAccess()); 3579 3580 // Register it as a conversion if appropriate. 3581 if (Shadow->getDeclName().getNameKind() 3582 == DeclarationName::CXXConversionFunctionName) 3583 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3584 3585 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3586 Shadow->setInvalidDecl(); 3587 3588 return Shadow; 3589} 3590 3591/// Hides a using shadow declaration. This is required by the current 3592/// using-decl implementation when a resolvable using declaration in a 3593/// class is followed by a declaration which would hide or override 3594/// one or more of the using decl's targets; for example: 3595/// 3596/// struct Base { void foo(int); }; 3597/// struct Derived : Base { 3598/// using Base::foo; 3599/// void foo(int); 3600/// }; 3601/// 3602/// The governing language is C++03 [namespace.udecl]p12: 3603/// 3604/// When a using-declaration brings names from a base class into a 3605/// derived class scope, member functions in the derived class 3606/// override and/or hide member functions with the same name and 3607/// parameter types in a base class (rather than conflicting). 3608/// 3609/// There are two ways to implement this: 3610/// (1) optimistically create shadow decls when they're not hidden 3611/// by existing declarations, or 3612/// (2) don't create any shadow decls (or at least don't make them 3613/// visible) until we've fully parsed/instantiated the class. 3614/// The problem with (1) is that we might have to retroactively remove 3615/// a shadow decl, which requires several O(n) operations because the 3616/// decl structures are (very reasonably) not designed for removal. 3617/// (2) avoids this but is very fiddly and phase-dependent. 3618void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3619 if (Shadow->getDeclName().getNameKind() == 3620 DeclarationName::CXXConversionFunctionName) 3621 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3622 3623 // Remove it from the DeclContext... 3624 Shadow->getDeclContext()->removeDecl(Shadow); 3625 3626 // ...and the scope, if applicable... 3627 if (S) { 3628 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3629 IdResolver.RemoveDecl(Shadow); 3630 } 3631 3632 // ...and the using decl. 3633 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3634 3635 // TODO: complain somehow if Shadow was used. It shouldn't 3636 // be possible for this to happen, because...? 3637} 3638 3639/// Builds a using declaration. 3640/// 3641/// \param IsInstantiation - Whether this call arises from an 3642/// instantiation of an unresolved using declaration. We treat 3643/// the lookup differently for these declarations. 3644NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3645 SourceLocation UsingLoc, 3646 CXXScopeSpec &SS, 3647 SourceLocation IdentLoc, 3648 DeclarationName Name, 3649 AttributeList *AttrList, 3650 bool IsInstantiation, 3651 bool IsTypeName, 3652 SourceLocation TypenameLoc) { 3653 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3654 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3655 3656 // FIXME: We ignore attributes for now. 3657 delete AttrList; 3658 3659 if (SS.isEmpty()) { 3660 Diag(IdentLoc, diag::err_using_requires_qualname); 3661 return 0; 3662 } 3663 3664 // Do the redeclaration lookup in the current scope. 3665 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3666 ForRedeclaration); 3667 Previous.setHideTags(false); 3668 if (S) { 3669 LookupName(Previous, S); 3670 3671 // It is really dumb that we have to do this. 3672 LookupResult::Filter F = Previous.makeFilter(); 3673 while (F.hasNext()) { 3674 NamedDecl *D = F.next(); 3675 if (!isDeclInScope(D, CurContext, S)) 3676 F.erase(); 3677 } 3678 F.done(); 3679 } else { 3680 assert(IsInstantiation && "no scope in non-instantiation"); 3681 assert(CurContext->isRecord() && "scope not record in instantiation"); 3682 LookupQualifiedName(Previous, CurContext); 3683 } 3684 3685 NestedNameSpecifier *NNS = 3686 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3687 3688 // Check for invalid redeclarations. 3689 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3690 return 0; 3691 3692 // Check for bad qualifiers. 3693 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3694 return 0; 3695 3696 DeclContext *LookupContext = computeDeclContext(SS); 3697 NamedDecl *D; 3698 if (!LookupContext) { 3699 if (IsTypeName) { 3700 // FIXME: not all declaration name kinds are legal here 3701 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3702 UsingLoc, TypenameLoc, 3703 SS.getRange(), NNS, 3704 IdentLoc, Name); 3705 } else { 3706 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3707 UsingLoc, SS.getRange(), NNS, 3708 IdentLoc, Name); 3709 } 3710 } else { 3711 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3712 SS.getRange(), UsingLoc, NNS, Name, 3713 IsTypeName); 3714 } 3715 D->setAccess(AS); 3716 CurContext->addDecl(D); 3717 3718 if (!LookupContext) return D; 3719 UsingDecl *UD = cast<UsingDecl>(D); 3720 3721 if (RequireCompleteDeclContext(SS)) { 3722 UD->setInvalidDecl(); 3723 return UD; 3724 } 3725 3726 // Look up the target name. 3727 3728 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3729 3730 // Unlike most lookups, we don't always want to hide tag 3731 // declarations: tag names are visible through the using declaration 3732 // even if hidden by ordinary names, *except* in a dependent context 3733 // where it's important for the sanity of two-phase lookup. 3734 if (!IsInstantiation) 3735 R.setHideTags(false); 3736 3737 LookupQualifiedName(R, LookupContext); 3738 3739 if (R.empty()) { 3740 Diag(IdentLoc, diag::err_no_member) 3741 << Name << LookupContext << SS.getRange(); 3742 UD->setInvalidDecl(); 3743 return UD; 3744 } 3745 3746 if (R.isAmbiguous()) { 3747 UD->setInvalidDecl(); 3748 return UD; 3749 } 3750 3751 if (IsTypeName) { 3752 // If we asked for a typename and got a non-type decl, error out. 3753 if (!R.getAsSingle<TypeDecl>()) { 3754 Diag(IdentLoc, diag::err_using_typename_non_type); 3755 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3756 Diag((*I)->getUnderlyingDecl()->getLocation(), 3757 diag::note_using_decl_target); 3758 UD->setInvalidDecl(); 3759 return UD; 3760 } 3761 } else { 3762 // If we asked for a non-typename and we got a type, error out, 3763 // but only if this is an instantiation of an unresolved using 3764 // decl. Otherwise just silently find the type name. 3765 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3766 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3767 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3768 UD->setInvalidDecl(); 3769 return UD; 3770 } 3771 } 3772 3773 // C++0x N2914 [namespace.udecl]p6: 3774 // A using-declaration shall not name a namespace. 3775 if (R.getAsSingle<NamespaceDecl>()) { 3776 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3777 << SS.getRange(); 3778 UD->setInvalidDecl(); 3779 return UD; 3780 } 3781 3782 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3783 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3784 BuildUsingShadowDecl(S, UD, *I); 3785 } 3786 3787 return UD; 3788} 3789 3790/// Checks that the given using declaration is not an invalid 3791/// redeclaration. Note that this is checking only for the using decl 3792/// itself, not for any ill-formedness among the UsingShadowDecls. 3793bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3794 bool isTypeName, 3795 const CXXScopeSpec &SS, 3796 SourceLocation NameLoc, 3797 const LookupResult &Prev) { 3798 // C++03 [namespace.udecl]p8: 3799 // C++0x [namespace.udecl]p10: 3800 // A using-declaration is a declaration and can therefore be used 3801 // repeatedly where (and only where) multiple declarations are 3802 // allowed. 3803 // That's only in file contexts. 3804 if (CurContext->getLookupContext()->isFileContext()) 3805 return false; 3806 3807 NestedNameSpecifier *Qual 3808 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3809 3810 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3811 NamedDecl *D = *I; 3812 3813 bool DTypename; 3814 NestedNameSpecifier *DQual; 3815 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3816 DTypename = UD->isTypeName(); 3817 DQual = UD->getTargetNestedNameDecl(); 3818 } else if (UnresolvedUsingValueDecl *UD 3819 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3820 DTypename = false; 3821 DQual = UD->getTargetNestedNameSpecifier(); 3822 } else if (UnresolvedUsingTypenameDecl *UD 3823 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3824 DTypename = true; 3825 DQual = UD->getTargetNestedNameSpecifier(); 3826 } else continue; 3827 3828 // using decls differ if one says 'typename' and the other doesn't. 3829 // FIXME: non-dependent using decls? 3830 if (isTypeName != DTypename) continue; 3831 3832 // using decls differ if they name different scopes (but note that 3833 // template instantiation can cause this check to trigger when it 3834 // didn't before instantiation). 3835 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3836 Context.getCanonicalNestedNameSpecifier(DQual)) 3837 continue; 3838 3839 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3840 Diag(D->getLocation(), diag::note_using_decl) << 1; 3841 return true; 3842 } 3843 3844 return false; 3845} 3846 3847 3848/// Checks that the given nested-name qualifier used in a using decl 3849/// in the current context is appropriately related to the current 3850/// scope. If an error is found, diagnoses it and returns true. 3851bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3852 const CXXScopeSpec &SS, 3853 SourceLocation NameLoc) { 3854 DeclContext *NamedContext = computeDeclContext(SS); 3855 3856 if (!CurContext->isRecord()) { 3857 // C++03 [namespace.udecl]p3: 3858 // C++0x [namespace.udecl]p8: 3859 // A using-declaration for a class member shall be a member-declaration. 3860 3861 // If we weren't able to compute a valid scope, it must be a 3862 // dependent class scope. 3863 if (!NamedContext || NamedContext->isRecord()) { 3864 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3865 << SS.getRange(); 3866 return true; 3867 } 3868 3869 // Otherwise, everything is known to be fine. 3870 return false; 3871 } 3872 3873 // The current scope is a record. 3874 3875 // If the named context is dependent, we can't decide much. 3876 if (!NamedContext) { 3877 // FIXME: in C++0x, we can diagnose if we can prove that the 3878 // nested-name-specifier does not refer to a base class, which is 3879 // still possible in some cases. 3880 3881 // Otherwise we have to conservatively report that things might be 3882 // okay. 3883 return false; 3884 } 3885 3886 if (!NamedContext->isRecord()) { 3887 // Ideally this would point at the last name in the specifier, 3888 // but we don't have that level of source info. 3889 Diag(SS.getRange().getBegin(), 3890 diag::err_using_decl_nested_name_specifier_is_not_class) 3891 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3892 return true; 3893 } 3894 3895 if (getLangOptions().CPlusPlus0x) { 3896 // C++0x [namespace.udecl]p3: 3897 // In a using-declaration used as a member-declaration, the 3898 // nested-name-specifier shall name a base class of the class 3899 // being defined. 3900 3901 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3902 cast<CXXRecordDecl>(NamedContext))) { 3903 if (CurContext == NamedContext) { 3904 Diag(NameLoc, 3905 diag::err_using_decl_nested_name_specifier_is_current_class) 3906 << SS.getRange(); 3907 return true; 3908 } 3909 3910 Diag(SS.getRange().getBegin(), 3911 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3912 << (NestedNameSpecifier*) SS.getScopeRep() 3913 << cast<CXXRecordDecl>(CurContext) 3914 << SS.getRange(); 3915 return true; 3916 } 3917 3918 return false; 3919 } 3920 3921 // C++03 [namespace.udecl]p4: 3922 // A using-declaration used as a member-declaration shall refer 3923 // to a member of a base class of the class being defined [etc.]. 3924 3925 // Salient point: SS doesn't have to name a base class as long as 3926 // lookup only finds members from base classes. Therefore we can 3927 // diagnose here only if we can prove that that can't happen, 3928 // i.e. if the class hierarchies provably don't intersect. 3929 3930 // TODO: it would be nice if "definitely valid" results were cached 3931 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3932 // need to be repeated. 3933 3934 struct UserData { 3935 llvm::DenseSet<const CXXRecordDecl*> Bases; 3936 3937 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3938 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3939 Data->Bases.insert(Base); 3940 return true; 3941 } 3942 3943 bool hasDependentBases(const CXXRecordDecl *Class) { 3944 return !Class->forallBases(collect, this); 3945 } 3946 3947 /// Returns true if the base is dependent or is one of the 3948 /// accumulated base classes. 3949 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3950 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3951 return !Data->Bases.count(Base); 3952 } 3953 3954 bool mightShareBases(const CXXRecordDecl *Class) { 3955 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3956 } 3957 }; 3958 3959 UserData Data; 3960 3961 // Returns false if we find a dependent base. 3962 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3963 return false; 3964 3965 // Returns false if the class has a dependent base or if it or one 3966 // of its bases is present in the base set of the current context. 3967 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3968 return false; 3969 3970 Diag(SS.getRange().getBegin(), 3971 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3972 << (NestedNameSpecifier*) SS.getScopeRep() 3973 << cast<CXXRecordDecl>(CurContext) 3974 << SS.getRange(); 3975 3976 return true; 3977} 3978 3979Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3980 SourceLocation NamespaceLoc, 3981 SourceLocation AliasLoc, 3982 IdentifierInfo *Alias, 3983 CXXScopeSpec &SS, 3984 SourceLocation IdentLoc, 3985 IdentifierInfo *Ident) { 3986 3987 // Lookup the namespace name. 3988 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3989 LookupParsedName(R, S, &SS); 3990 3991 // Check if we have a previous declaration with the same name. 3992 if (NamedDecl *PrevDecl 3993 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 3994 ForRedeclaration)) { 3995 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3996 // We already have an alias with the same name that points to the same 3997 // namespace, so don't create a new one. 3998 // FIXME: At some point, we'll want to create the (redundant) 3999 // declaration to maintain better source information. 4000 if (!R.isAmbiguous() && !R.empty() && 4001 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4002 return DeclPtrTy(); 4003 } 4004 4005 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4006 diag::err_redefinition_different_kind; 4007 Diag(AliasLoc, DiagID) << Alias; 4008 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4009 return DeclPtrTy(); 4010 } 4011 4012 if (R.isAmbiguous()) 4013 return DeclPtrTy(); 4014 4015 if (R.empty()) { 4016 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4017 return DeclPtrTy(); 4018 } 4019 4020 NamespaceAliasDecl *AliasDecl = 4021 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4022 Alias, SS.getRange(), 4023 (NestedNameSpecifier *)SS.getScopeRep(), 4024 IdentLoc, R.getFoundDecl()); 4025 4026 PushOnScopeChains(AliasDecl, S); 4027 return DeclPtrTy::make(AliasDecl); 4028} 4029 4030void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4031 CXXConstructorDecl *Constructor) { 4032 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4033 !Constructor->isUsed()) && 4034 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4035 4036 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4037 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4038 4039 DeclContext *PreviousContext = CurContext; 4040 CurContext = Constructor; 4041 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false)) { 4042 Diag(CurrentLocation, diag::note_member_synthesized_at) 4043 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4044 Constructor->setInvalidDecl(); 4045 } else { 4046 Constructor->setUsed(); 4047 } 4048 CurContext = PreviousContext; 4049} 4050 4051void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4052 CXXDestructorDecl *Destructor) { 4053 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 4054 "DefineImplicitDestructor - call it for implicit default dtor"); 4055 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4056 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4057 4058 DeclContext *PreviousContext = CurContext; 4059 CurContext = Destructor; 4060 4061 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4062 Destructor->getParent()); 4063 4064 // FIXME: If CheckDestructor fails, we should emit a note about where the 4065 // implicit destructor was needed. 4066 if (CheckDestructor(Destructor)) { 4067 Diag(CurrentLocation, diag::note_member_synthesized_at) 4068 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4069 4070 Destructor->setInvalidDecl(); 4071 CurContext = PreviousContext; 4072 4073 return; 4074 } 4075 CurContext = PreviousContext; 4076 4077 Destructor->setUsed(); 4078} 4079 4080void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 4081 CXXMethodDecl *MethodDecl) { 4082 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 4083 MethodDecl->getOverloadedOperator() == OO_Equal && 4084 !MethodDecl->isUsed()) && 4085 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 4086 4087 CXXRecordDecl *ClassDecl 4088 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 4089 4090 DeclContext *PreviousContext = CurContext; 4091 CurContext = MethodDecl; 4092 4093 // C++[class.copy] p12 4094 // Before the implicitly-declared copy assignment operator for a class is 4095 // implicitly defined, all implicitly-declared copy assignment operators 4096 // for its direct base classes and its nonstatic data members shall have 4097 // been implicitly defined. 4098 bool err = false; 4099 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4100 E = ClassDecl->bases_end(); Base != E; ++Base) { 4101 CXXRecordDecl *BaseClassDecl 4102 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4103 if (CXXMethodDecl *BaseAssignOpMethod = 4104 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 4105 BaseClassDecl)) { 4106 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 4107 BaseAssignOpMethod, 4108 PDiag(diag::err_access_assign_base) 4109 << Base->getType()); 4110 4111 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 4112 } 4113 } 4114 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4115 E = ClassDecl->field_end(); Field != E; ++Field) { 4116 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 4117 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 4118 FieldType = Array->getElementType(); 4119 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4120 CXXRecordDecl *FieldClassDecl 4121 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4122 if (CXXMethodDecl *FieldAssignOpMethod = 4123 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 4124 FieldClassDecl)) { 4125 CheckDirectMemberAccess(Field->getLocation(), 4126 FieldAssignOpMethod, 4127 PDiag(diag::err_access_assign_field) 4128 << Field->getDeclName() << Field->getType()); 4129 4130 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 4131 } 4132 } else if (FieldType->isReferenceType()) { 4133 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4134 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4135 Diag(Field->getLocation(), diag::note_declared_at); 4136 Diag(CurrentLocation, diag::note_first_required_here); 4137 err = true; 4138 } else if (FieldType.isConstQualified()) { 4139 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4140 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4141 Diag(Field->getLocation(), diag::note_declared_at); 4142 Diag(CurrentLocation, diag::note_first_required_here); 4143 err = true; 4144 } 4145 } 4146 if (!err) 4147 MethodDecl->setUsed(); 4148 4149 CurContext = PreviousContext; 4150} 4151 4152CXXMethodDecl * 4153Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 4154 ParmVarDecl *ParmDecl, 4155 CXXRecordDecl *ClassDecl) { 4156 QualType LHSType = Context.getTypeDeclType(ClassDecl); 4157 QualType RHSType(LHSType); 4158 // If class's assignment operator argument is const/volatile qualified, 4159 // look for operator = (const/volatile B&). Otherwise, look for 4160 // operator = (B&). 4161 RHSType = Context.getCVRQualifiedType(RHSType, 4162 ParmDecl->getType().getCVRQualifiers()); 4163 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 4164 LHSType, 4165 SourceLocation())); 4166 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 4167 RHSType, 4168 CurrentLocation)); 4169 Expr *Args[2] = { &*LHS, &*RHS }; 4170 OverloadCandidateSet CandidateSet(CurrentLocation); 4171 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 4172 CandidateSet); 4173 OverloadCandidateSet::iterator Best; 4174 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 4175 return cast<CXXMethodDecl>(Best->Function); 4176 assert(false && 4177 "getAssignOperatorMethod - copy assignment operator method not found"); 4178 return 0; 4179} 4180 4181void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 4182 CXXConstructorDecl *CopyConstructor, 4183 unsigned TypeQuals) { 4184 assert((CopyConstructor->isImplicit() && 4185 CopyConstructor->isCopyConstructor(TypeQuals) && 4186 !CopyConstructor->isUsed()) && 4187 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 4188 4189 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 4190 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 4191 4192 DeclContext *PreviousContext = CurContext; 4193 CurContext = CopyConstructor; 4194 4195 // C++ [class.copy] p209 4196 // Before the implicitly-declared copy constructor for a class is 4197 // implicitly defined, all the implicitly-declared copy constructors 4198 // for its base class and its non-static data members shall have been 4199 // implicitly defined. 4200 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 4201 Base != ClassDecl->bases_end(); ++Base) { 4202 CXXRecordDecl *BaseClassDecl 4203 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4204 if (CXXConstructorDecl *BaseCopyCtor = 4205 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) { 4206 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 4207 BaseCopyCtor, 4208 PDiag(diag::err_access_copy_base) 4209 << Base->getType()); 4210 4211 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 4212 } 4213 } 4214 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4215 FieldEnd = ClassDecl->field_end(); 4216 Field != FieldEnd; ++Field) { 4217 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 4218 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 4219 FieldType = Array->getElementType(); 4220 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4221 CXXRecordDecl *FieldClassDecl 4222 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4223 if (CXXConstructorDecl *FieldCopyCtor = 4224 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) { 4225 CheckDirectMemberAccess(Field->getLocation(), 4226 FieldCopyCtor, 4227 PDiag(diag::err_access_copy_field) 4228 << Field->getDeclName() << Field->getType()); 4229 4230 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 4231 } 4232 } 4233 } 4234 CopyConstructor->setUsed(); 4235 4236 CurContext = PreviousContext; 4237} 4238 4239Sema::OwningExprResult 4240Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4241 CXXConstructorDecl *Constructor, 4242 MultiExprArg ExprArgs, 4243 bool RequiresZeroInit, 4244 bool BaseInitialization) { 4245 bool Elidable = false; 4246 4247 // C++0x [class.copy]p34: 4248 // When certain criteria are met, an implementation is allowed to 4249 // omit the copy/move construction of a class object, even if the 4250 // copy/move constructor and/or destructor for the object have 4251 // side effects. [...] 4252 // - when a temporary class object that has not been bound to a 4253 // reference (12.2) would be copied/moved to a class object 4254 // with the same cv-unqualified type, the copy/move operation 4255 // can be omitted by constructing the temporary object 4256 // directly into the target of the omitted copy/move 4257 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 4258 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 4259 Elidable = SubExpr->isTemporaryObject() && 4260 Context.hasSameUnqualifiedType(SubExpr->getType(), 4261 Context.getTypeDeclType(Constructor->getParent())); 4262 } 4263 4264 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4265 Elidable, move(ExprArgs), RequiresZeroInit, 4266 BaseInitialization); 4267} 4268 4269/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4270/// including handling of its default argument expressions. 4271Sema::OwningExprResult 4272Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4273 CXXConstructorDecl *Constructor, bool Elidable, 4274 MultiExprArg ExprArgs, 4275 bool RequiresZeroInit, 4276 bool BaseInitialization) { 4277 unsigned NumExprs = ExprArgs.size(); 4278 Expr **Exprs = (Expr **)ExprArgs.release(); 4279 4280 MarkDeclarationReferenced(ConstructLoc, Constructor); 4281 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4282 Constructor, Elidable, Exprs, NumExprs, 4283 RequiresZeroInit, BaseInitialization)); 4284} 4285 4286bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4287 CXXConstructorDecl *Constructor, 4288 MultiExprArg Exprs) { 4289 OwningExprResult TempResult = 4290 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4291 move(Exprs)); 4292 if (TempResult.isInvalid()) 4293 return true; 4294 4295 Expr *Temp = TempResult.takeAs<Expr>(); 4296 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4297 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4298 VD->setInit(Temp); 4299 4300 return false; 4301} 4302 4303void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4304 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4305 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4306 !ClassDecl->hasTrivialDestructor()) { 4307 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4308 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4309 CheckDestructorAccess(VD->getLocation(), Destructor, 4310 PDiag(diag::err_access_dtor_var) 4311 << VD->getDeclName() 4312 << VD->getType()); 4313 } 4314} 4315 4316/// AddCXXDirectInitializerToDecl - This action is called immediately after 4317/// ActOnDeclarator, when a C++ direct initializer is present. 4318/// e.g: "int x(1);" 4319void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4320 SourceLocation LParenLoc, 4321 MultiExprArg Exprs, 4322 SourceLocation *CommaLocs, 4323 SourceLocation RParenLoc) { 4324 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4325 Decl *RealDecl = Dcl.getAs<Decl>(); 4326 4327 // If there is no declaration, there was an error parsing it. Just ignore 4328 // the initializer. 4329 if (RealDecl == 0) 4330 return; 4331 4332 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4333 if (!VDecl) { 4334 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4335 RealDecl->setInvalidDecl(); 4336 return; 4337 } 4338 4339 // We will represent direct-initialization similarly to copy-initialization: 4340 // int x(1); -as-> int x = 1; 4341 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4342 // 4343 // Clients that want to distinguish between the two forms, can check for 4344 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4345 // A major benefit is that clients that don't particularly care about which 4346 // exactly form was it (like the CodeGen) can handle both cases without 4347 // special case code. 4348 4349 // C++ 8.5p11: 4350 // The form of initialization (using parentheses or '=') is generally 4351 // insignificant, but does matter when the entity being initialized has a 4352 // class type. 4353 QualType DeclInitType = VDecl->getType(); 4354 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4355 DeclInitType = Context.getBaseElementType(Array); 4356 4357 if (!VDecl->getType()->isDependentType() && 4358 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4359 diag::err_typecheck_decl_incomplete_type)) { 4360 VDecl->setInvalidDecl(); 4361 return; 4362 } 4363 4364 // The variable can not have an abstract class type. 4365 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4366 diag::err_abstract_type_in_decl, 4367 AbstractVariableType)) 4368 VDecl->setInvalidDecl(); 4369 4370 const VarDecl *Def; 4371 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4372 Diag(VDecl->getLocation(), diag::err_redefinition) 4373 << VDecl->getDeclName(); 4374 Diag(Def->getLocation(), diag::note_previous_definition); 4375 VDecl->setInvalidDecl(); 4376 return; 4377 } 4378 4379 // If either the declaration has a dependent type or if any of the 4380 // expressions is type-dependent, we represent the initialization 4381 // via a ParenListExpr for later use during template instantiation. 4382 if (VDecl->getType()->isDependentType() || 4383 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4384 // Let clients know that initialization was done with a direct initializer. 4385 VDecl->setCXXDirectInitializer(true); 4386 4387 // Store the initialization expressions as a ParenListExpr. 4388 unsigned NumExprs = Exprs.size(); 4389 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4390 (Expr **)Exprs.release(), 4391 NumExprs, RParenLoc)); 4392 return; 4393 } 4394 4395 // Capture the variable that is being initialized and the style of 4396 // initialization. 4397 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4398 4399 // FIXME: Poor source location information. 4400 InitializationKind Kind 4401 = InitializationKind::CreateDirect(VDecl->getLocation(), 4402 LParenLoc, RParenLoc); 4403 4404 InitializationSequence InitSeq(*this, Entity, Kind, 4405 (Expr**)Exprs.get(), Exprs.size()); 4406 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4407 if (Result.isInvalid()) { 4408 VDecl->setInvalidDecl(); 4409 return; 4410 } 4411 4412 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4413 VDecl->setInit(Result.takeAs<Expr>()); 4414 VDecl->setCXXDirectInitializer(true); 4415 4416 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4417 FinalizeVarWithDestructor(VDecl, Record); 4418} 4419 4420/// \brief Given a constructor and the set of arguments provided for the 4421/// constructor, convert the arguments and add any required default arguments 4422/// to form a proper call to this constructor. 4423/// 4424/// \returns true if an error occurred, false otherwise. 4425bool 4426Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4427 MultiExprArg ArgsPtr, 4428 SourceLocation Loc, 4429 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4430 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4431 unsigned NumArgs = ArgsPtr.size(); 4432 Expr **Args = (Expr **)ArgsPtr.get(); 4433 4434 const FunctionProtoType *Proto 4435 = Constructor->getType()->getAs<FunctionProtoType>(); 4436 assert(Proto && "Constructor without a prototype?"); 4437 unsigned NumArgsInProto = Proto->getNumArgs(); 4438 4439 // If too few arguments are available, we'll fill in the rest with defaults. 4440 if (NumArgs < NumArgsInProto) 4441 ConvertedArgs.reserve(NumArgsInProto); 4442 else 4443 ConvertedArgs.reserve(NumArgs); 4444 4445 VariadicCallType CallType = 4446 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4447 llvm::SmallVector<Expr *, 8> AllArgs; 4448 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4449 Proto, 0, Args, NumArgs, AllArgs, 4450 CallType); 4451 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4452 ConvertedArgs.push_back(AllArgs[i]); 4453 return Invalid; 4454} 4455 4456static inline bool 4457CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4458 const FunctionDecl *FnDecl) { 4459 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4460 if (isa<NamespaceDecl>(DC)) { 4461 return SemaRef.Diag(FnDecl->getLocation(), 4462 diag::err_operator_new_delete_declared_in_namespace) 4463 << FnDecl->getDeclName(); 4464 } 4465 4466 if (isa<TranslationUnitDecl>(DC) && 4467 FnDecl->getStorageClass() == FunctionDecl::Static) { 4468 return SemaRef.Diag(FnDecl->getLocation(), 4469 diag::err_operator_new_delete_declared_static) 4470 << FnDecl->getDeclName(); 4471 } 4472 4473 return false; 4474} 4475 4476static inline bool 4477CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4478 CanQualType ExpectedResultType, 4479 CanQualType ExpectedFirstParamType, 4480 unsigned DependentParamTypeDiag, 4481 unsigned InvalidParamTypeDiag) { 4482 QualType ResultType = 4483 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4484 4485 // Check that the result type is not dependent. 4486 if (ResultType->isDependentType()) 4487 return SemaRef.Diag(FnDecl->getLocation(), 4488 diag::err_operator_new_delete_dependent_result_type) 4489 << FnDecl->getDeclName() << ExpectedResultType; 4490 4491 // Check that the result type is what we expect. 4492 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4493 return SemaRef.Diag(FnDecl->getLocation(), 4494 diag::err_operator_new_delete_invalid_result_type) 4495 << FnDecl->getDeclName() << ExpectedResultType; 4496 4497 // A function template must have at least 2 parameters. 4498 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4499 return SemaRef.Diag(FnDecl->getLocation(), 4500 diag::err_operator_new_delete_template_too_few_parameters) 4501 << FnDecl->getDeclName(); 4502 4503 // The function decl must have at least 1 parameter. 4504 if (FnDecl->getNumParams() == 0) 4505 return SemaRef.Diag(FnDecl->getLocation(), 4506 diag::err_operator_new_delete_too_few_parameters) 4507 << FnDecl->getDeclName(); 4508 4509 // Check the the first parameter type is not dependent. 4510 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4511 if (FirstParamType->isDependentType()) 4512 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4513 << FnDecl->getDeclName() << ExpectedFirstParamType; 4514 4515 // Check that the first parameter type is what we expect. 4516 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4517 ExpectedFirstParamType) 4518 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4519 << FnDecl->getDeclName() << ExpectedFirstParamType; 4520 4521 return false; 4522} 4523 4524static bool 4525CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4526 // C++ [basic.stc.dynamic.allocation]p1: 4527 // A program is ill-formed if an allocation function is declared in a 4528 // namespace scope other than global scope or declared static in global 4529 // scope. 4530 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4531 return true; 4532 4533 CanQualType SizeTy = 4534 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4535 4536 // C++ [basic.stc.dynamic.allocation]p1: 4537 // The return type shall be void*. The first parameter shall have type 4538 // std::size_t. 4539 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4540 SizeTy, 4541 diag::err_operator_new_dependent_param_type, 4542 diag::err_operator_new_param_type)) 4543 return true; 4544 4545 // C++ [basic.stc.dynamic.allocation]p1: 4546 // The first parameter shall not have an associated default argument. 4547 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4548 return SemaRef.Diag(FnDecl->getLocation(), 4549 diag::err_operator_new_default_arg) 4550 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4551 4552 return false; 4553} 4554 4555static bool 4556CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4557 // C++ [basic.stc.dynamic.deallocation]p1: 4558 // A program is ill-formed if deallocation functions are declared in a 4559 // namespace scope other than global scope or declared static in global 4560 // scope. 4561 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4562 return true; 4563 4564 // C++ [basic.stc.dynamic.deallocation]p2: 4565 // Each deallocation function shall return void and its first parameter 4566 // shall be void*. 4567 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4568 SemaRef.Context.VoidPtrTy, 4569 diag::err_operator_delete_dependent_param_type, 4570 diag::err_operator_delete_param_type)) 4571 return true; 4572 4573 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4574 if (FirstParamType->isDependentType()) 4575 return SemaRef.Diag(FnDecl->getLocation(), 4576 diag::err_operator_delete_dependent_param_type) 4577 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4578 4579 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4580 SemaRef.Context.VoidPtrTy) 4581 return SemaRef.Diag(FnDecl->getLocation(), 4582 diag::err_operator_delete_param_type) 4583 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4584 4585 return false; 4586} 4587 4588/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4589/// of this overloaded operator is well-formed. If so, returns false; 4590/// otherwise, emits appropriate diagnostics and returns true. 4591bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4592 assert(FnDecl && FnDecl->isOverloadedOperator() && 4593 "Expected an overloaded operator declaration"); 4594 4595 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4596 4597 // C++ [over.oper]p5: 4598 // The allocation and deallocation functions, operator new, 4599 // operator new[], operator delete and operator delete[], are 4600 // described completely in 3.7.3. The attributes and restrictions 4601 // found in the rest of this subclause do not apply to them unless 4602 // explicitly stated in 3.7.3. 4603 if (Op == OO_Delete || Op == OO_Array_Delete) 4604 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4605 4606 if (Op == OO_New || Op == OO_Array_New) 4607 return CheckOperatorNewDeclaration(*this, FnDecl); 4608 4609 // C++ [over.oper]p6: 4610 // An operator function shall either be a non-static member 4611 // function or be a non-member function and have at least one 4612 // parameter whose type is a class, a reference to a class, an 4613 // enumeration, or a reference to an enumeration. 4614 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4615 if (MethodDecl->isStatic()) 4616 return Diag(FnDecl->getLocation(), 4617 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4618 } else { 4619 bool ClassOrEnumParam = false; 4620 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4621 ParamEnd = FnDecl->param_end(); 4622 Param != ParamEnd; ++Param) { 4623 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4624 if (ParamType->isDependentType() || ParamType->isRecordType() || 4625 ParamType->isEnumeralType()) { 4626 ClassOrEnumParam = true; 4627 break; 4628 } 4629 } 4630 4631 if (!ClassOrEnumParam) 4632 return Diag(FnDecl->getLocation(), 4633 diag::err_operator_overload_needs_class_or_enum) 4634 << FnDecl->getDeclName(); 4635 } 4636 4637 // C++ [over.oper]p8: 4638 // An operator function cannot have default arguments (8.3.6), 4639 // except where explicitly stated below. 4640 // 4641 // Only the function-call operator allows default arguments 4642 // (C++ [over.call]p1). 4643 if (Op != OO_Call) { 4644 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4645 Param != FnDecl->param_end(); ++Param) { 4646 if ((*Param)->hasDefaultArg()) 4647 return Diag((*Param)->getLocation(), 4648 diag::err_operator_overload_default_arg) 4649 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4650 } 4651 } 4652 4653 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4654 { false, false, false } 4655#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4656 , { Unary, Binary, MemberOnly } 4657#include "clang/Basic/OperatorKinds.def" 4658 }; 4659 4660 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4661 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4662 bool MustBeMemberOperator = OperatorUses[Op][2]; 4663 4664 // C++ [over.oper]p8: 4665 // [...] Operator functions cannot have more or fewer parameters 4666 // than the number required for the corresponding operator, as 4667 // described in the rest of this subclause. 4668 unsigned NumParams = FnDecl->getNumParams() 4669 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4670 if (Op != OO_Call && 4671 ((NumParams == 1 && !CanBeUnaryOperator) || 4672 (NumParams == 2 && !CanBeBinaryOperator) || 4673 (NumParams < 1) || (NumParams > 2))) { 4674 // We have the wrong number of parameters. 4675 unsigned ErrorKind; 4676 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4677 ErrorKind = 2; // 2 -> unary or binary. 4678 } else if (CanBeUnaryOperator) { 4679 ErrorKind = 0; // 0 -> unary 4680 } else { 4681 assert(CanBeBinaryOperator && 4682 "All non-call overloaded operators are unary or binary!"); 4683 ErrorKind = 1; // 1 -> binary 4684 } 4685 4686 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4687 << FnDecl->getDeclName() << NumParams << ErrorKind; 4688 } 4689 4690 // Overloaded operators other than operator() cannot be variadic. 4691 if (Op != OO_Call && 4692 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4693 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4694 << FnDecl->getDeclName(); 4695 } 4696 4697 // Some operators must be non-static member functions. 4698 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4699 return Diag(FnDecl->getLocation(), 4700 diag::err_operator_overload_must_be_member) 4701 << FnDecl->getDeclName(); 4702 } 4703 4704 // C++ [over.inc]p1: 4705 // The user-defined function called operator++ implements the 4706 // prefix and postfix ++ operator. If this function is a member 4707 // function with no parameters, or a non-member function with one 4708 // parameter of class or enumeration type, it defines the prefix 4709 // increment operator ++ for objects of that type. If the function 4710 // is a member function with one parameter (which shall be of type 4711 // int) or a non-member function with two parameters (the second 4712 // of which shall be of type int), it defines the postfix 4713 // increment operator ++ for objects of that type. 4714 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 4715 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 4716 bool ParamIsInt = false; 4717 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 4718 ParamIsInt = BT->getKind() == BuiltinType::Int; 4719 4720 if (!ParamIsInt) 4721 return Diag(LastParam->getLocation(), 4722 diag::err_operator_overload_post_incdec_must_be_int) 4723 << LastParam->getType() << (Op == OO_MinusMinus); 4724 } 4725 4726 // Notify the class if it got an assignment operator. 4727 if (Op == OO_Equal) { 4728 // Would have returned earlier otherwise. 4729 assert(isa<CXXMethodDecl>(FnDecl) && 4730 "Overloaded = not member, but not filtered."); 4731 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 4732 Method->getParent()->addedAssignmentOperator(Context, Method); 4733 } 4734 4735 return false; 4736} 4737 4738/// CheckLiteralOperatorDeclaration - Check whether the declaration 4739/// of this literal operator function is well-formed. If so, returns 4740/// false; otherwise, emits appropriate diagnostics and returns true. 4741bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 4742 DeclContext *DC = FnDecl->getDeclContext(); 4743 Decl::Kind Kind = DC->getDeclKind(); 4744 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 4745 Kind != Decl::LinkageSpec) { 4746 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 4747 << FnDecl->getDeclName(); 4748 return true; 4749 } 4750 4751 bool Valid = false; 4752 4753 // template <char...> type operator "" name() is the only valid template 4754 // signature, and the only valid signature with no parameters. 4755 if (FnDecl->param_size() == 0) { 4756 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 4757 // Must have only one template parameter 4758 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 4759 if (Params->size() == 1) { 4760 NonTypeTemplateParmDecl *PmDecl = 4761 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 4762 4763 // The template parameter must be a char parameter pack. 4764 // FIXME: This test will always fail because non-type parameter packs 4765 // have not been implemented. 4766 if (PmDecl && PmDecl->isTemplateParameterPack() && 4767 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 4768 Valid = true; 4769 } 4770 } 4771 } else { 4772 // Check the first parameter 4773 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4774 4775 QualType T = (*Param)->getType(); 4776 4777 // unsigned long long int, long double, and any character type are allowed 4778 // as the only parameters. 4779 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 4780 Context.hasSameType(T, Context.LongDoubleTy) || 4781 Context.hasSameType(T, Context.CharTy) || 4782 Context.hasSameType(T, Context.WCharTy) || 4783 Context.hasSameType(T, Context.Char16Ty) || 4784 Context.hasSameType(T, Context.Char32Ty)) { 4785 if (++Param == FnDecl->param_end()) 4786 Valid = true; 4787 goto FinishedParams; 4788 } 4789 4790 // Otherwise it must be a pointer to const; let's strip those qualifiers. 4791 const PointerType *PT = T->getAs<PointerType>(); 4792 if (!PT) 4793 goto FinishedParams; 4794 T = PT->getPointeeType(); 4795 if (!T.isConstQualified()) 4796 goto FinishedParams; 4797 T = T.getUnqualifiedType(); 4798 4799 // Move on to the second parameter; 4800 ++Param; 4801 4802 // If there is no second parameter, the first must be a const char * 4803 if (Param == FnDecl->param_end()) { 4804 if (Context.hasSameType(T, Context.CharTy)) 4805 Valid = true; 4806 goto FinishedParams; 4807 } 4808 4809 // const char *, const wchar_t*, const char16_t*, and const char32_t* 4810 // are allowed as the first parameter to a two-parameter function 4811 if (!(Context.hasSameType(T, Context.CharTy) || 4812 Context.hasSameType(T, Context.WCharTy) || 4813 Context.hasSameType(T, Context.Char16Ty) || 4814 Context.hasSameType(T, Context.Char32Ty))) 4815 goto FinishedParams; 4816 4817 // The second and final parameter must be an std::size_t 4818 T = (*Param)->getType().getUnqualifiedType(); 4819 if (Context.hasSameType(T, Context.getSizeType()) && 4820 ++Param == FnDecl->param_end()) 4821 Valid = true; 4822 } 4823 4824 // FIXME: This diagnostic is absolutely terrible. 4825FinishedParams: 4826 if (!Valid) { 4827 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 4828 << FnDecl->getDeclName(); 4829 return true; 4830 } 4831 4832 return false; 4833} 4834 4835/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 4836/// linkage specification, including the language and (if present) 4837/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 4838/// the location of the language string literal, which is provided 4839/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 4840/// the '{' brace. Otherwise, this linkage specification does not 4841/// have any braces. 4842Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 4843 SourceLocation ExternLoc, 4844 SourceLocation LangLoc, 4845 const char *Lang, 4846 unsigned StrSize, 4847 SourceLocation LBraceLoc) { 4848 LinkageSpecDecl::LanguageIDs Language; 4849 if (strncmp(Lang, "\"C\"", StrSize) == 0) 4850 Language = LinkageSpecDecl::lang_c; 4851 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 4852 Language = LinkageSpecDecl::lang_cxx; 4853 else { 4854 Diag(LangLoc, diag::err_bad_language); 4855 return DeclPtrTy(); 4856 } 4857 4858 // FIXME: Add all the various semantics of linkage specifications 4859 4860 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 4861 LangLoc, Language, 4862 LBraceLoc.isValid()); 4863 CurContext->addDecl(D); 4864 PushDeclContext(S, D); 4865 return DeclPtrTy::make(D); 4866} 4867 4868/// ActOnFinishLinkageSpecification - Completely the definition of 4869/// the C++ linkage specification LinkageSpec. If RBraceLoc is 4870/// valid, it's the position of the closing '}' brace in a linkage 4871/// specification that uses braces. 4872Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 4873 DeclPtrTy LinkageSpec, 4874 SourceLocation RBraceLoc) { 4875 if (LinkageSpec) 4876 PopDeclContext(); 4877 return LinkageSpec; 4878} 4879 4880/// \brief Perform semantic analysis for the variable declaration that 4881/// occurs within a C++ catch clause, returning the newly-created 4882/// variable. 4883VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 4884 TypeSourceInfo *TInfo, 4885 IdentifierInfo *Name, 4886 SourceLocation Loc, 4887 SourceRange Range) { 4888 bool Invalid = false; 4889 4890 // Arrays and functions decay. 4891 if (ExDeclType->isArrayType()) 4892 ExDeclType = Context.getArrayDecayedType(ExDeclType); 4893 else if (ExDeclType->isFunctionType()) 4894 ExDeclType = Context.getPointerType(ExDeclType); 4895 4896 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 4897 // The exception-declaration shall not denote a pointer or reference to an 4898 // incomplete type, other than [cv] void*. 4899 // N2844 forbids rvalue references. 4900 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 4901 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 4902 Invalid = true; 4903 } 4904 4905 // GCC allows catching pointers and references to incomplete types 4906 // as an extension; so do we, but we warn by default. 4907 4908 QualType BaseType = ExDeclType; 4909 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 4910 unsigned DK = diag::err_catch_incomplete; 4911 bool IncompleteCatchIsInvalid = true; 4912 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 4913 BaseType = Ptr->getPointeeType(); 4914 Mode = 1; 4915 DK = diag::ext_catch_incomplete_ptr; 4916 IncompleteCatchIsInvalid = false; 4917 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 4918 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 4919 BaseType = Ref->getPointeeType(); 4920 Mode = 2; 4921 DK = diag::ext_catch_incomplete_ref; 4922 IncompleteCatchIsInvalid = false; 4923 } 4924 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 4925 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 4926 IncompleteCatchIsInvalid) 4927 Invalid = true; 4928 4929 if (!Invalid && !ExDeclType->isDependentType() && 4930 RequireNonAbstractType(Loc, ExDeclType, 4931 diag::err_abstract_type_in_decl, 4932 AbstractVariableType)) 4933 Invalid = true; 4934 4935 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 4936 Name, ExDeclType, TInfo, VarDecl::None, 4937 VarDecl::None); 4938 4939 if (!Invalid) { 4940 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 4941 // C++ [except.handle]p16: 4942 // The object declared in an exception-declaration or, if the 4943 // exception-declaration does not specify a name, a temporary (12.2) is 4944 // copy-initialized (8.5) from the exception object. [...] 4945 // The object is destroyed when the handler exits, after the destruction 4946 // of any automatic objects initialized within the handler. 4947 // 4948 // We just pretend to initialize the object with itself, then make sure 4949 // it can be destroyed later. 4950 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 4951 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 4952 Loc, ExDeclType, 0); 4953 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 4954 SourceLocation()); 4955 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 4956 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4957 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 4958 if (Result.isInvalid()) 4959 Invalid = true; 4960 else 4961 FinalizeVarWithDestructor(ExDecl, RecordTy); 4962 } 4963 } 4964 4965 if (Invalid) 4966 ExDecl->setInvalidDecl(); 4967 4968 return ExDecl; 4969} 4970 4971/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 4972/// handler. 4973Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 4974 TypeSourceInfo *TInfo = 0; 4975 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 4976 4977 bool Invalid = D.isInvalidType(); 4978 IdentifierInfo *II = D.getIdentifier(); 4979 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 4980 LookupOrdinaryName, 4981 ForRedeclaration)) { 4982 // The scope should be freshly made just for us. There is just no way 4983 // it contains any previous declaration. 4984 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 4985 if (PrevDecl->isTemplateParameter()) { 4986 // Maybe we will complain about the shadowed template parameter. 4987 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4988 } 4989 } 4990 4991 if (D.getCXXScopeSpec().isSet() && !Invalid) { 4992 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 4993 << D.getCXXScopeSpec().getRange(); 4994 Invalid = true; 4995 } 4996 4997 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 4998 D.getIdentifier(), 4999 D.getIdentifierLoc(), 5000 D.getDeclSpec().getSourceRange()); 5001 5002 if (Invalid) 5003 ExDecl->setInvalidDecl(); 5004 5005 // Add the exception declaration into this scope. 5006 if (II) 5007 PushOnScopeChains(ExDecl, S); 5008 else 5009 CurContext->addDecl(ExDecl); 5010 5011 ProcessDeclAttributes(S, ExDecl, D); 5012 return DeclPtrTy::make(ExDecl); 5013} 5014 5015Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5016 ExprArg assertexpr, 5017 ExprArg assertmessageexpr) { 5018 Expr *AssertExpr = (Expr *)assertexpr.get(); 5019 StringLiteral *AssertMessage = 5020 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5021 5022 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5023 llvm::APSInt Value(32); 5024 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5025 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5026 AssertExpr->getSourceRange(); 5027 return DeclPtrTy(); 5028 } 5029 5030 if (Value == 0) { 5031 Diag(AssertLoc, diag::err_static_assert_failed) 5032 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5033 } 5034 } 5035 5036 assertexpr.release(); 5037 assertmessageexpr.release(); 5038 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5039 AssertExpr, AssertMessage); 5040 5041 CurContext->addDecl(Decl); 5042 return DeclPtrTy::make(Decl); 5043} 5044 5045/// \brief Perform semantic analysis of the given friend type declaration. 5046/// 5047/// \returns A friend declaration that. 5048FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 5049 TypeSourceInfo *TSInfo) { 5050 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 5051 5052 QualType T = TSInfo->getType(); 5053 SourceRange TypeRange = TSInfo->getTypeLoc().getSourceRange(); 5054 5055 if (!getLangOptions().CPlusPlus0x) { 5056 // C++03 [class.friend]p2: 5057 // An elaborated-type-specifier shall be used in a friend declaration 5058 // for a class.* 5059 // 5060 // * The class-key of the elaborated-type-specifier is required. 5061 if (!ActiveTemplateInstantiations.empty()) { 5062 // Do not complain about the form of friend template types during 5063 // template instantiation; we will already have complained when the 5064 // template was declared. 5065 } else if (!T->isElaboratedTypeSpecifier()) { 5066 // If we evaluated the type to a record type, suggest putting 5067 // a tag in front. 5068 if (const RecordType *RT = T->getAs<RecordType>()) { 5069 RecordDecl *RD = RT->getDecl(); 5070 5071 std::string InsertionText = std::string(" ") + RD->getKindName(); 5072 5073 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 5074 << (unsigned) RD->getTagKind() 5075 << T 5076 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 5077 InsertionText); 5078 } else { 5079 Diag(FriendLoc, diag::ext_nonclass_type_friend) 5080 << T 5081 << SourceRange(FriendLoc, TypeRange.getEnd()); 5082 } 5083 } else if (T->getAs<EnumType>()) { 5084 Diag(FriendLoc, diag::ext_enum_friend) 5085 << T 5086 << SourceRange(FriendLoc, TypeRange.getEnd()); 5087 } 5088 } 5089 5090 // C++0x [class.friend]p3: 5091 // If the type specifier in a friend declaration designates a (possibly 5092 // cv-qualified) class type, that class is declared as a friend; otherwise, 5093 // the friend declaration is ignored. 5094 5095 // FIXME: C++0x has some syntactic restrictions on friend type declarations 5096 // in [class.friend]p3 that we do not implement. 5097 5098 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 5099} 5100 5101/// Handle a friend type declaration. This works in tandem with 5102/// ActOnTag. 5103/// 5104/// Notes on friend class templates: 5105/// 5106/// We generally treat friend class declarations as if they were 5107/// declaring a class. So, for example, the elaborated type specifier 5108/// in a friend declaration is required to obey the restrictions of a 5109/// class-head (i.e. no typedefs in the scope chain), template 5110/// parameters are required to match up with simple template-ids, &c. 5111/// However, unlike when declaring a template specialization, it's 5112/// okay to refer to a template specialization without an empty 5113/// template parameter declaration, e.g. 5114/// friend class A<T>::B<unsigned>; 5115/// We permit this as a special case; if there are any template 5116/// parameters present at all, require proper matching, i.e. 5117/// template <> template <class T> friend class A<int>::B; 5118Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5119 MultiTemplateParamsArg TempParams) { 5120 SourceLocation Loc = DS.getSourceRange().getBegin(); 5121 5122 assert(DS.isFriendSpecified()); 5123 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5124 5125 // Try to convert the decl specifier to a type. This works for 5126 // friend templates because ActOnTag never produces a ClassTemplateDecl 5127 // for a TUK_Friend. 5128 Declarator TheDeclarator(DS, Declarator::MemberContext); 5129 TypeSourceInfo *TSI; 5130 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 5131 if (TheDeclarator.isInvalidType()) 5132 return DeclPtrTy(); 5133 5134 if (!TSI) 5135 TSI = Context.getTrivialTypeSourceInfo(T, DS.getSourceRange().getBegin()); 5136 5137 // This is definitely an error in C++98. It's probably meant to 5138 // be forbidden in C++0x, too, but the specification is just 5139 // poorly written. 5140 // 5141 // The problem is with declarations like the following: 5142 // template <T> friend A<T>::foo; 5143 // where deciding whether a class C is a friend or not now hinges 5144 // on whether there exists an instantiation of A that causes 5145 // 'foo' to equal C. There are restrictions on class-heads 5146 // (which we declare (by fiat) elaborated friend declarations to 5147 // be) that makes this tractable. 5148 // 5149 // FIXME: handle "template <> friend class A<T>;", which 5150 // is possibly well-formed? Who even knows? 5151 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5152 Diag(Loc, diag::err_tagless_friend_type_template) 5153 << DS.getSourceRange(); 5154 return DeclPtrTy(); 5155 } 5156 5157 // C++98 [class.friend]p1: A friend of a class is a function 5158 // or class that is not a member of the class . . . 5159 // This is fixed in DR77, which just barely didn't make the C++03 5160 // deadline. It's also a very silly restriction that seriously 5161 // affects inner classes and which nobody else seems to implement; 5162 // thus we never diagnose it, not even in -pedantic. 5163 // 5164 // But note that we could warn about it: it's always useless to 5165 // friend one of your own members (it's not, however, worthless to 5166 // friend a member of an arbitrary specialization of your template). 5167 5168 Decl *D; 5169 if (unsigned NumTempParamLists = TempParams.size()) 5170 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5171 NumTempParamLists, 5172 (TemplateParameterList**) TempParams.release(), 5173 TSI, 5174 DS.getFriendSpecLoc()); 5175 else 5176 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 5177 5178 if (!D) 5179 return DeclPtrTy(); 5180 5181 D->setAccess(AS_public); 5182 CurContext->addDecl(D); 5183 5184 return DeclPtrTy::make(D); 5185} 5186 5187Sema::DeclPtrTy 5188Sema::ActOnFriendFunctionDecl(Scope *S, 5189 Declarator &D, 5190 bool IsDefinition, 5191 MultiTemplateParamsArg TemplateParams) { 5192 const DeclSpec &DS = D.getDeclSpec(); 5193 5194 assert(DS.isFriendSpecified()); 5195 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5196 5197 SourceLocation Loc = D.getIdentifierLoc(); 5198 TypeSourceInfo *TInfo = 0; 5199 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5200 5201 // C++ [class.friend]p1 5202 // A friend of a class is a function or class.... 5203 // Note that this sees through typedefs, which is intended. 5204 // It *doesn't* see through dependent types, which is correct 5205 // according to [temp.arg.type]p3: 5206 // If a declaration acquires a function type through a 5207 // type dependent on a template-parameter and this causes 5208 // a declaration that does not use the syntactic form of a 5209 // function declarator to have a function type, the program 5210 // is ill-formed. 5211 if (!T->isFunctionType()) { 5212 Diag(Loc, diag::err_unexpected_friend); 5213 5214 // It might be worthwhile to try to recover by creating an 5215 // appropriate declaration. 5216 return DeclPtrTy(); 5217 } 5218 5219 // C++ [namespace.memdef]p3 5220 // - If a friend declaration in a non-local class first declares a 5221 // class or function, the friend class or function is a member 5222 // of the innermost enclosing namespace. 5223 // - The name of the friend is not found by simple name lookup 5224 // until a matching declaration is provided in that namespace 5225 // scope (either before or after the class declaration granting 5226 // friendship). 5227 // - If a friend function is called, its name may be found by the 5228 // name lookup that considers functions from namespaces and 5229 // classes associated with the types of the function arguments. 5230 // - When looking for a prior declaration of a class or a function 5231 // declared as a friend, scopes outside the innermost enclosing 5232 // namespace scope are not considered. 5233 5234 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5235 DeclarationName Name = GetNameForDeclarator(D); 5236 assert(Name); 5237 5238 // The context we found the declaration in, or in which we should 5239 // create the declaration. 5240 DeclContext *DC; 5241 5242 // FIXME: handle local classes 5243 5244 // Recover from invalid scope qualifiers as if they just weren't there. 5245 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5246 ForRedeclaration); 5247 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5248 // FIXME: RequireCompleteDeclContext 5249 DC = computeDeclContext(ScopeQual); 5250 5251 // FIXME: handle dependent contexts 5252 if (!DC) return DeclPtrTy(); 5253 5254 LookupQualifiedName(Previous, DC); 5255 5256 // If searching in that context implicitly found a declaration in 5257 // a different context, treat it like it wasn't found at all. 5258 // TODO: better diagnostics for this case. Suggesting the right 5259 // qualified scope would be nice... 5260 // FIXME: getRepresentativeDecl() is not right here at all 5261 if (Previous.empty() || 5262 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5263 D.setInvalidType(); 5264 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5265 return DeclPtrTy(); 5266 } 5267 5268 // C++ [class.friend]p1: A friend of a class is a function or 5269 // class that is not a member of the class . . . 5270 if (DC->Equals(CurContext)) 5271 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5272 5273 // Otherwise walk out to the nearest namespace scope looking for matches. 5274 } else { 5275 // TODO: handle local class contexts. 5276 5277 DC = CurContext; 5278 while (true) { 5279 // Skip class contexts. If someone can cite chapter and verse 5280 // for this behavior, that would be nice --- it's what GCC and 5281 // EDG do, and it seems like a reasonable intent, but the spec 5282 // really only says that checks for unqualified existing 5283 // declarations should stop at the nearest enclosing namespace, 5284 // not that they should only consider the nearest enclosing 5285 // namespace. 5286 while (DC->isRecord()) 5287 DC = DC->getParent(); 5288 5289 LookupQualifiedName(Previous, DC); 5290 5291 // TODO: decide what we think about using declarations. 5292 if (!Previous.empty()) 5293 break; 5294 5295 if (DC->isFileContext()) break; 5296 DC = DC->getParent(); 5297 } 5298 5299 // C++ [class.friend]p1: A friend of a class is a function or 5300 // class that is not a member of the class . . . 5301 // C++0x changes this for both friend types and functions. 5302 // Most C++ 98 compilers do seem to give an error here, so 5303 // we do, too. 5304 if (!Previous.empty() && DC->Equals(CurContext) 5305 && !getLangOptions().CPlusPlus0x) 5306 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5307 } 5308 5309 if (DC->isFileContext()) { 5310 // This implies that it has to be an operator or function. 5311 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5312 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5313 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5314 Diag(Loc, diag::err_introducing_special_friend) << 5315 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5316 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5317 return DeclPtrTy(); 5318 } 5319 } 5320 5321 bool Redeclaration = false; 5322 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5323 move(TemplateParams), 5324 IsDefinition, 5325 Redeclaration); 5326 if (!ND) return DeclPtrTy(); 5327 5328 assert(ND->getDeclContext() == DC); 5329 assert(ND->getLexicalDeclContext() == CurContext); 5330 5331 // Add the function declaration to the appropriate lookup tables, 5332 // adjusting the redeclarations list as necessary. We don't 5333 // want to do this yet if the friending class is dependent. 5334 // 5335 // Also update the scope-based lookup if the target context's 5336 // lookup context is in lexical scope. 5337 if (!CurContext->isDependentContext()) { 5338 DC = DC->getLookupContext(); 5339 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5340 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5341 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5342 } 5343 5344 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5345 D.getIdentifierLoc(), ND, 5346 DS.getFriendSpecLoc()); 5347 FrD->setAccess(AS_public); 5348 CurContext->addDecl(FrD); 5349 5350 return DeclPtrTy::make(ND); 5351} 5352 5353void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5354 AdjustDeclIfTemplate(dcl); 5355 5356 Decl *Dcl = dcl.getAs<Decl>(); 5357 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5358 if (!Fn) { 5359 Diag(DelLoc, diag::err_deleted_non_function); 5360 return; 5361 } 5362 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5363 Diag(DelLoc, diag::err_deleted_decl_not_first); 5364 Diag(Prev->getLocation(), diag::note_previous_declaration); 5365 // If the declaration wasn't the first, we delete the function anyway for 5366 // recovery. 5367 } 5368 Fn->setDeleted(); 5369} 5370 5371static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5372 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5373 ++CI) { 5374 Stmt *SubStmt = *CI; 5375 if (!SubStmt) 5376 continue; 5377 if (isa<ReturnStmt>(SubStmt)) 5378 Self.Diag(SubStmt->getSourceRange().getBegin(), 5379 diag::err_return_in_constructor_handler); 5380 if (!isa<Expr>(SubStmt)) 5381 SearchForReturnInStmt(Self, SubStmt); 5382 } 5383} 5384 5385void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5386 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5387 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5388 SearchForReturnInStmt(*this, Handler); 5389 } 5390} 5391 5392bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5393 const CXXMethodDecl *Old) { 5394 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5395 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5396 5397 if (Context.hasSameType(NewTy, OldTy) || 5398 NewTy->isDependentType() || OldTy->isDependentType()) 5399 return false; 5400 5401 // Check if the return types are covariant 5402 QualType NewClassTy, OldClassTy; 5403 5404 /// Both types must be pointers or references to classes. 5405 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5406 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5407 NewClassTy = NewPT->getPointeeType(); 5408 OldClassTy = OldPT->getPointeeType(); 5409 } 5410 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5411 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5412 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5413 NewClassTy = NewRT->getPointeeType(); 5414 OldClassTy = OldRT->getPointeeType(); 5415 } 5416 } 5417 } 5418 5419 // The return types aren't either both pointers or references to a class type. 5420 if (NewClassTy.isNull()) { 5421 Diag(New->getLocation(), 5422 diag::err_different_return_type_for_overriding_virtual_function) 5423 << New->getDeclName() << NewTy << OldTy; 5424 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5425 5426 return true; 5427 } 5428 5429 // C++ [class.virtual]p6: 5430 // If the return type of D::f differs from the return type of B::f, the 5431 // class type in the return type of D::f shall be complete at the point of 5432 // declaration of D::f or shall be the class type D. 5433 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5434 if (!RT->isBeingDefined() && 5435 RequireCompleteType(New->getLocation(), NewClassTy, 5436 PDiag(diag::err_covariant_return_incomplete) 5437 << New->getDeclName())) 5438 return true; 5439 } 5440 5441 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5442 // Check if the new class derives from the old class. 5443 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5444 Diag(New->getLocation(), 5445 diag::err_covariant_return_not_derived) 5446 << New->getDeclName() << NewTy << OldTy; 5447 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5448 return true; 5449 } 5450 5451 // Check if we the conversion from derived to base is valid. 5452 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5453 diag::err_covariant_return_inaccessible_base, 5454 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5455 // FIXME: Should this point to the return type? 5456 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 5457 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5458 return true; 5459 } 5460 } 5461 5462 // The qualifiers of the return types must be the same. 5463 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5464 Diag(New->getLocation(), 5465 diag::err_covariant_return_type_different_qualifications) 5466 << New->getDeclName() << NewTy << OldTy; 5467 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5468 return true; 5469 }; 5470 5471 5472 // The new class type must have the same or less qualifiers as the old type. 5473 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5474 Diag(New->getLocation(), 5475 diag::err_covariant_return_type_class_type_more_qualified) 5476 << New->getDeclName() << NewTy << OldTy; 5477 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5478 return true; 5479 }; 5480 5481 return false; 5482} 5483 5484bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5485 const CXXMethodDecl *Old) 5486{ 5487 if (Old->hasAttr<FinalAttr>()) { 5488 Diag(New->getLocation(), diag::err_final_function_overridden) 5489 << New->getDeclName(); 5490 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5491 return true; 5492 } 5493 5494 return false; 5495} 5496 5497/// \brief Mark the given method pure. 5498/// 5499/// \param Method the method to be marked pure. 5500/// 5501/// \param InitRange the source range that covers the "0" initializer. 5502bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5503 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5504 Method->setPure(); 5505 5506 // A class is abstract if at least one function is pure virtual. 5507 Method->getParent()->setAbstract(true); 5508 return false; 5509 } 5510 5511 if (!Method->isInvalidDecl()) 5512 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5513 << Method->getDeclName() << InitRange; 5514 return true; 5515} 5516 5517/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5518/// an initializer for the out-of-line declaration 'Dcl'. The scope 5519/// is a fresh scope pushed for just this purpose. 5520/// 5521/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5522/// static data member of class X, names should be looked up in the scope of 5523/// class X. 5524void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5525 // If there is no declaration, there was an error parsing it. 5526 Decl *D = Dcl.getAs<Decl>(); 5527 if (D == 0) return; 5528 5529 // We should only get called for declarations with scope specifiers, like: 5530 // int foo::bar; 5531 assert(D->isOutOfLine()); 5532 EnterDeclaratorContext(S, D->getDeclContext()); 5533} 5534 5535/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5536/// initializer for the out-of-line declaration 'Dcl'. 5537void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5538 // If there is no declaration, there was an error parsing it. 5539 Decl *D = Dcl.getAs<Decl>(); 5540 if (D == 0) return; 5541 5542 assert(D->isOutOfLine()); 5543 ExitDeclaratorContext(S); 5544} 5545 5546/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5547/// C++ if/switch/while/for statement. 5548/// e.g: "if (int x = f()) {...}" 5549Action::DeclResult 5550Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5551 // C++ 6.4p2: 5552 // The declarator shall not specify a function or an array. 5553 // The type-specifier-seq shall not contain typedef and shall not declare a 5554 // new class or enumeration. 5555 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5556 "Parser allowed 'typedef' as storage class of condition decl."); 5557 5558 TypeSourceInfo *TInfo = 0; 5559 TagDecl *OwnedTag = 0; 5560 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5561 5562 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5563 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5564 // would be created and CXXConditionDeclExpr wants a VarDecl. 5565 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5566 << D.getSourceRange(); 5567 return DeclResult(); 5568 } else if (OwnedTag && OwnedTag->isDefinition()) { 5569 // The type-specifier-seq shall not declare a new class or enumeration. 5570 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5571 } 5572 5573 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5574 if (!Dcl) 5575 return DeclResult(); 5576 5577 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5578 VD->setDeclaredInCondition(true); 5579 return Dcl; 5580} 5581 5582static bool needsVTable(CXXMethodDecl *MD, ASTContext &Context) { 5583 // Ignore dependent types. 5584 if (MD->isDependentContext()) 5585 return false; 5586 5587 // Ignore declarations that are not definitions. 5588 if (!MD->isThisDeclarationADefinition()) 5589 return false; 5590 5591 CXXRecordDecl *RD = MD->getParent(); 5592 5593 // Ignore classes without a vtable. 5594 if (!RD->isDynamicClass()) 5595 return false; 5596 5597 switch (MD->getParent()->getTemplateSpecializationKind()) { 5598 case TSK_Undeclared: 5599 case TSK_ExplicitSpecialization: 5600 // Classes that aren't instantiations of templates don't need their 5601 // virtual methods marked until we see the definition of the key 5602 // function. 5603 break; 5604 5605 case TSK_ImplicitInstantiation: 5606 // This is a constructor of a class template; mark all of the virtual 5607 // members as referenced to ensure that they get instantiatied. 5608 if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) 5609 return true; 5610 break; 5611 5612 case TSK_ExplicitInstantiationDeclaration: 5613 return false; 5614 5615 case TSK_ExplicitInstantiationDefinition: 5616 // This is method of a explicit instantiation; mark all of the virtual 5617 // members as referenced to ensure that they get instantiatied. 5618 return true; 5619 } 5620 5621 // Consider only out-of-line definitions of member functions. When we see 5622 // an inline definition, it's too early to compute the key function. 5623 if (!MD->isOutOfLine()) 5624 return false; 5625 5626 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5627 5628 // If there is no key function, we will need a copy of the vtable. 5629 if (!KeyFunction) 5630 return true; 5631 5632 // If this is the key function, we need to mark virtual members. 5633 if (KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) 5634 return true; 5635 5636 return false; 5637} 5638 5639void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5640 CXXMethodDecl *MD) { 5641 CXXRecordDecl *RD = MD->getParent(); 5642 5643 // We will need to mark all of the virtual members as referenced to build the 5644 // vtable. 5645 if (!needsVTable(MD, Context)) 5646 return; 5647 5648 TemplateSpecializationKind kind = RD->getTemplateSpecializationKind(); 5649 if (kind == TSK_ImplicitInstantiation) 5650 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 5651 else 5652 MarkVirtualMembersReferenced(Loc, RD); 5653} 5654 5655bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5656 if (ClassesWithUnmarkedVirtualMembers.empty()) 5657 return false; 5658 5659 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 5660 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 5661 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 5662 ClassesWithUnmarkedVirtualMembers.pop_back(); 5663 MarkVirtualMembersReferenced(Loc, RD); 5664 } 5665 5666 return true; 5667} 5668 5669void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 5670 const CXXRecordDecl *RD) { 5671 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5672 e = RD->method_end(); i != e; ++i) { 5673 CXXMethodDecl *MD = *i; 5674 5675 // C++ [basic.def.odr]p2: 5676 // [...] A virtual member function is used if it is not pure. [...] 5677 if (MD->isVirtual() && !MD->isPure()) 5678 MarkDeclarationReferenced(Loc, MD); 5679 } 5680 5681 // Only classes that have virtual bases need a VTT. 5682 if (RD->getNumVBases() == 0) 5683 return; 5684 5685 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 5686 e = RD->bases_end(); i != e; ++i) { 5687 const CXXRecordDecl *Base = 5688 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 5689 if (i->isVirtual()) 5690 continue; 5691 if (Base->getNumVBases() == 0) 5692 continue; 5693 MarkVirtualMembersReferenced(Loc, Base); 5694 } 5695} 5696