SemaDeclCXX.cpp revision f05a422bad3cc5dbe20c57b69c8ce3ad74c202e8
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/RecordLayout.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/TypeLoc.h" 23#include "clang/AST/TypeOrdering.h" 24#include "clang/AST/StmtVisitor.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Parse/Template.h" 27#include "clang/Basic/PartialDiagnostic.h" 28#include "clang/Lex/Preprocessor.h" 29#include "llvm/ADT/STLExtras.h" 30#include <map> 31#include <set> 32 33using namespace clang; 34 35//===----------------------------------------------------------------------===// 36// CheckDefaultArgumentVisitor 37//===----------------------------------------------------------------------===// 38 39namespace { 40 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 41 /// the default argument of a parameter to determine whether it 42 /// contains any ill-formed subexpressions. For example, this will 43 /// diagnose the use of local variables or parameters within the 44 /// default argument expression. 45 class CheckDefaultArgumentVisitor 46 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 47 Expr *DefaultArg; 48 Sema *S; 49 50 public: 51 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 52 : DefaultArg(defarg), S(s) {} 53 54 bool VisitExpr(Expr *Node); 55 bool VisitDeclRefExpr(DeclRefExpr *DRE); 56 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 57 }; 58 59 /// VisitExpr - Visit all of the children of this expression. 60 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 61 bool IsInvalid = false; 62 for (Stmt::child_iterator I = Node->child_begin(), 63 E = Node->child_end(); I != E; ++I) 64 IsInvalid |= Visit(*I); 65 return IsInvalid; 66 } 67 68 /// VisitDeclRefExpr - Visit a reference to a declaration, to 69 /// determine whether this declaration can be used in the default 70 /// argument expression. 71 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 72 NamedDecl *Decl = DRE->getDecl(); 73 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 74 // C++ [dcl.fct.default]p9 75 // Default arguments are evaluated each time the function is 76 // called. The order of evaluation of function arguments is 77 // unspecified. Consequently, parameters of a function shall not 78 // be used in default argument expressions, even if they are not 79 // evaluated. Parameters of a function declared before a default 80 // argument expression are in scope and can hide namespace and 81 // class member names. 82 return S->Diag(DRE->getSourceRange().getBegin(), 83 diag::err_param_default_argument_references_param) 84 << Param->getDeclName() << DefaultArg->getSourceRange(); 85 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 86 // C++ [dcl.fct.default]p7 87 // Local variables shall not be used in default argument 88 // expressions. 89 if (VDecl->isBlockVarDecl()) 90 return S->Diag(DRE->getSourceRange().getBegin(), 91 diag::err_param_default_argument_references_local) 92 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 93 } 94 95 return false; 96 } 97 98 /// VisitCXXThisExpr - Visit a C++ "this" expression. 99 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 100 // C++ [dcl.fct.default]p8: 101 // The keyword this shall not be used in a default argument of a 102 // member function. 103 return S->Diag(ThisE->getSourceRange().getBegin(), 104 diag::err_param_default_argument_references_this) 105 << ThisE->getSourceRange(); 106 } 107} 108 109bool 110Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 111 SourceLocation EqualLoc) { 112 if (RequireCompleteType(Param->getLocation(), Param->getType(), 113 diag::err_typecheck_decl_incomplete_type)) { 114 Param->setInvalidDecl(); 115 return true; 116 } 117 118 Expr *Arg = (Expr *)DefaultArg.get(); 119 120 // C++ [dcl.fct.default]p5 121 // A default argument expression is implicitly converted (clause 122 // 4) to the parameter type. The default argument expression has 123 // the same semantic constraints as the initializer expression in 124 // a declaration of a variable of the parameter type, using the 125 // copy-initialization semantics (8.5). 126 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 127 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 128 EqualLoc); 129 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 130 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 131 MultiExprArg(*this, (void**)&Arg, 1)); 132 if (Result.isInvalid()) 133 return true; 134 Arg = Result.takeAs<Expr>(); 135 136 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 137 138 // Okay: add the default argument to the parameter 139 Param->setDefaultArg(Arg); 140 141 DefaultArg.release(); 142 143 return false; 144} 145 146/// ActOnParamDefaultArgument - Check whether the default argument 147/// provided for a function parameter is well-formed. If so, attach it 148/// to the parameter declaration. 149void 150Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 151 ExprArg defarg) { 152 if (!param || !defarg.get()) 153 return; 154 155 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 156 UnparsedDefaultArgLocs.erase(Param); 157 158 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 159 160 // Default arguments are only permitted in C++ 161 if (!getLangOptions().CPlusPlus) { 162 Diag(EqualLoc, diag::err_param_default_argument) 163 << DefaultArg->getSourceRange(); 164 Param->setInvalidDecl(); 165 return; 166 } 167 168 // Check that the default argument is well-formed 169 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 170 if (DefaultArgChecker.Visit(DefaultArg.get())) { 171 Param->setInvalidDecl(); 172 return; 173 } 174 175 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 176} 177 178/// ActOnParamUnparsedDefaultArgument - We've seen a default 179/// argument for a function parameter, but we can't parse it yet 180/// because we're inside a class definition. Note that this default 181/// argument will be parsed later. 182void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 183 SourceLocation EqualLoc, 184 SourceLocation ArgLoc) { 185 if (!param) 186 return; 187 188 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 189 if (Param) 190 Param->setUnparsedDefaultArg(); 191 192 UnparsedDefaultArgLocs[Param] = ArgLoc; 193} 194 195/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 196/// the default argument for the parameter param failed. 197void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 198 if (!param) 199 return; 200 201 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 202 203 Param->setInvalidDecl(); 204 205 UnparsedDefaultArgLocs.erase(Param); 206} 207 208/// CheckExtraCXXDefaultArguments - Check for any extra default 209/// arguments in the declarator, which is not a function declaration 210/// or definition and therefore is not permitted to have default 211/// arguments. This routine should be invoked for every declarator 212/// that is not a function declaration or definition. 213void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 214 // C++ [dcl.fct.default]p3 215 // A default argument expression shall be specified only in the 216 // parameter-declaration-clause of a function declaration or in a 217 // template-parameter (14.1). It shall not be specified for a 218 // parameter pack. If it is specified in a 219 // parameter-declaration-clause, it shall not occur within a 220 // declarator or abstract-declarator of a parameter-declaration. 221 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 222 DeclaratorChunk &chunk = D.getTypeObject(i); 223 if (chunk.Kind == DeclaratorChunk::Function) { 224 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 225 ParmVarDecl *Param = 226 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 227 if (Param->hasUnparsedDefaultArg()) { 228 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 229 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 230 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 231 delete Toks; 232 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 233 } else if (Param->getDefaultArg()) { 234 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 235 << Param->getDefaultArg()->getSourceRange(); 236 Param->setDefaultArg(0); 237 } 238 } 239 } 240 } 241} 242 243// MergeCXXFunctionDecl - Merge two declarations of the same C++ 244// function, once we already know that they have the same 245// type. Subroutine of MergeFunctionDecl. Returns true if there was an 246// error, false otherwise. 247bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 248 bool Invalid = false; 249 250 // C++ [dcl.fct.default]p4: 251 // For non-template functions, default arguments can be added in 252 // later declarations of a function in the same 253 // scope. Declarations in different scopes have completely 254 // distinct sets of default arguments. That is, declarations in 255 // inner scopes do not acquire default arguments from 256 // declarations in outer scopes, and vice versa. In a given 257 // function declaration, all parameters subsequent to a 258 // parameter with a default argument shall have default 259 // arguments supplied in this or previous declarations. A 260 // default argument shall not be redefined by a later 261 // declaration (not even to the same value). 262 // 263 // C++ [dcl.fct.default]p6: 264 // Except for member functions of class templates, the default arguments 265 // in a member function definition that appears outside of the class 266 // definition are added to the set of default arguments provided by the 267 // member function declaration in the class definition. 268 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 269 ParmVarDecl *OldParam = Old->getParamDecl(p); 270 ParmVarDecl *NewParam = New->getParamDecl(p); 271 272 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 273 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 274 // hint here. Alternatively, we could walk the type-source information 275 // for NewParam to find the last source location in the type... but it 276 // isn't worth the effort right now. This is the kind of test case that 277 // is hard to get right: 278 279 // int f(int); 280 // void g(int (*fp)(int) = f); 281 // void g(int (*fp)(int) = &f); 282 Diag(NewParam->getLocation(), 283 diag::err_param_default_argument_redefinition) 284 << NewParam->getDefaultArgRange(); 285 286 // Look for the function declaration where the default argument was 287 // actually written, which may be a declaration prior to Old. 288 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 289 Older; Older = Older->getPreviousDeclaration()) { 290 if (!Older->getParamDecl(p)->hasDefaultArg()) 291 break; 292 293 OldParam = Older->getParamDecl(p); 294 } 295 296 Diag(OldParam->getLocation(), diag::note_previous_definition) 297 << OldParam->getDefaultArgRange(); 298 Invalid = true; 299 } else if (OldParam->hasDefaultArg()) { 300 // Merge the old default argument into the new parameter 301 NewParam->setHasInheritedDefaultArg(); 302 if (OldParam->hasUninstantiatedDefaultArg()) 303 NewParam->setUninstantiatedDefaultArg( 304 OldParam->getUninstantiatedDefaultArg()); 305 else 306 NewParam->setDefaultArg(OldParam->getDefaultArg()); 307 } else if (NewParam->hasDefaultArg()) { 308 if (New->getDescribedFunctionTemplate()) { 309 // Paragraph 4, quoted above, only applies to non-template functions. 310 Diag(NewParam->getLocation(), 311 diag::err_param_default_argument_template_redecl) 312 << NewParam->getDefaultArgRange(); 313 Diag(Old->getLocation(), diag::note_template_prev_declaration) 314 << false; 315 } else if (New->getTemplateSpecializationKind() 316 != TSK_ImplicitInstantiation && 317 New->getTemplateSpecializationKind() != TSK_Undeclared) { 318 // C++ [temp.expr.spec]p21: 319 // Default function arguments shall not be specified in a declaration 320 // or a definition for one of the following explicit specializations: 321 // - the explicit specialization of a function template; 322 // - the explicit specialization of a member function template; 323 // - the explicit specialization of a member function of a class 324 // template where the class template specialization to which the 325 // member function specialization belongs is implicitly 326 // instantiated. 327 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 328 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 329 << New->getDeclName() 330 << NewParam->getDefaultArgRange(); 331 } else if (New->getDeclContext()->isDependentContext()) { 332 // C++ [dcl.fct.default]p6 (DR217): 333 // Default arguments for a member function of a class template shall 334 // be specified on the initial declaration of the member function 335 // within the class template. 336 // 337 // Reading the tea leaves a bit in DR217 and its reference to DR205 338 // leads me to the conclusion that one cannot add default function 339 // arguments for an out-of-line definition of a member function of a 340 // dependent type. 341 int WhichKind = 2; 342 if (CXXRecordDecl *Record 343 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 344 if (Record->getDescribedClassTemplate()) 345 WhichKind = 0; 346 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 347 WhichKind = 1; 348 else 349 WhichKind = 2; 350 } 351 352 Diag(NewParam->getLocation(), 353 diag::err_param_default_argument_member_template_redecl) 354 << WhichKind 355 << NewParam->getDefaultArgRange(); 356 } 357 } 358 } 359 360 if (CheckEquivalentExceptionSpec(Old, New)) 361 Invalid = true; 362 363 return Invalid; 364} 365 366/// CheckCXXDefaultArguments - Verify that the default arguments for a 367/// function declaration are well-formed according to C++ 368/// [dcl.fct.default]. 369void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 370 unsigned NumParams = FD->getNumParams(); 371 unsigned p; 372 373 // Find first parameter with a default argument 374 for (p = 0; p < NumParams; ++p) { 375 ParmVarDecl *Param = FD->getParamDecl(p); 376 if (Param->hasDefaultArg()) 377 break; 378 } 379 380 // C++ [dcl.fct.default]p4: 381 // In a given function declaration, all parameters 382 // subsequent to a parameter with a default argument shall 383 // have default arguments supplied in this or previous 384 // declarations. A default argument shall not be redefined 385 // by a later declaration (not even to the same value). 386 unsigned LastMissingDefaultArg = 0; 387 for (; p < NumParams; ++p) { 388 ParmVarDecl *Param = FD->getParamDecl(p); 389 if (!Param->hasDefaultArg()) { 390 if (Param->isInvalidDecl()) 391 /* We already complained about this parameter. */; 392 else if (Param->getIdentifier()) 393 Diag(Param->getLocation(), 394 diag::err_param_default_argument_missing_name) 395 << Param->getIdentifier(); 396 else 397 Diag(Param->getLocation(), 398 diag::err_param_default_argument_missing); 399 400 LastMissingDefaultArg = p; 401 } 402 } 403 404 if (LastMissingDefaultArg > 0) { 405 // Some default arguments were missing. Clear out all of the 406 // default arguments up to (and including) the last missing 407 // default argument, so that we leave the function parameters 408 // in a semantically valid state. 409 for (p = 0; p <= LastMissingDefaultArg; ++p) { 410 ParmVarDecl *Param = FD->getParamDecl(p); 411 if (Param->hasDefaultArg()) { 412 if (!Param->hasUnparsedDefaultArg()) 413 Param->getDefaultArg()->Destroy(Context); 414 Param->setDefaultArg(0); 415 } 416 } 417 } 418} 419 420/// isCurrentClassName - Determine whether the identifier II is the 421/// name of the class type currently being defined. In the case of 422/// nested classes, this will only return true if II is the name of 423/// the innermost class. 424bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 425 const CXXScopeSpec *SS) { 426 assert(getLangOptions().CPlusPlus && "No class names in C!"); 427 428 CXXRecordDecl *CurDecl; 429 if (SS && SS->isSet() && !SS->isInvalid()) { 430 DeclContext *DC = computeDeclContext(*SS, true); 431 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 432 } else 433 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 434 435 if (CurDecl && CurDecl->getIdentifier()) 436 return &II == CurDecl->getIdentifier(); 437 else 438 return false; 439} 440 441/// \brief Check the validity of a C++ base class specifier. 442/// 443/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 444/// and returns NULL otherwise. 445CXXBaseSpecifier * 446Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 447 SourceRange SpecifierRange, 448 bool Virtual, AccessSpecifier Access, 449 QualType BaseType, 450 SourceLocation BaseLoc) { 451 // C++ [class.union]p1: 452 // A union shall not have base classes. 453 if (Class->isUnion()) { 454 Diag(Class->getLocation(), diag::err_base_clause_on_union) 455 << SpecifierRange; 456 return 0; 457 } 458 459 if (BaseType->isDependentType()) 460 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 461 Class->getTagKind() == RecordDecl::TK_class, 462 Access, BaseType); 463 464 // Base specifiers must be record types. 465 if (!BaseType->isRecordType()) { 466 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 467 return 0; 468 } 469 470 // C++ [class.union]p1: 471 // A union shall not be used as a base class. 472 if (BaseType->isUnionType()) { 473 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 474 return 0; 475 } 476 477 // C++ [class.derived]p2: 478 // The class-name in a base-specifier shall not be an incompletely 479 // defined class. 480 if (RequireCompleteType(BaseLoc, BaseType, 481 PDiag(diag::err_incomplete_base_class) 482 << SpecifierRange)) 483 return 0; 484 485 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 486 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 487 assert(BaseDecl && "Record type has no declaration"); 488 BaseDecl = BaseDecl->getDefinition(); 489 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 490 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 491 assert(CXXBaseDecl && "Base type is not a C++ type"); 492 493 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 494 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 495 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 496 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 497 << BaseType; 498 return 0; 499 } 500 501 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 502 503 // Create the base specifier. 504 // FIXME: Allocate via ASTContext? 505 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 506 Class->getTagKind() == RecordDecl::TK_class, 507 Access, BaseType); 508} 509 510void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 511 const CXXRecordDecl *BaseClass, 512 bool BaseIsVirtual) { 513 // A class with a non-empty base class is not empty. 514 // FIXME: Standard ref? 515 if (!BaseClass->isEmpty()) 516 Class->setEmpty(false); 517 518 // C++ [class.virtual]p1: 519 // A class that [...] inherits a virtual function is called a polymorphic 520 // class. 521 if (BaseClass->isPolymorphic()) 522 Class->setPolymorphic(true); 523 524 // C++ [dcl.init.aggr]p1: 525 // An aggregate is [...] a class with [...] no base classes [...]. 526 Class->setAggregate(false); 527 528 // C++ [class]p4: 529 // A POD-struct is an aggregate class... 530 Class->setPOD(false); 531 532 if (BaseIsVirtual) { 533 // C++ [class.ctor]p5: 534 // A constructor is trivial if its class has no virtual base classes. 535 Class->setHasTrivialConstructor(false); 536 537 // C++ [class.copy]p6: 538 // A copy constructor is trivial if its class has no virtual base classes. 539 Class->setHasTrivialCopyConstructor(false); 540 541 // C++ [class.copy]p11: 542 // A copy assignment operator is trivial if its class has no virtual 543 // base classes. 544 Class->setHasTrivialCopyAssignment(false); 545 546 // C++0x [meta.unary.prop] is_empty: 547 // T is a class type, but not a union type, with ... no virtual base 548 // classes 549 Class->setEmpty(false); 550 } else { 551 // C++ [class.ctor]p5: 552 // A constructor is trivial if all the direct base classes of its 553 // class have trivial constructors. 554 if (!BaseClass->hasTrivialConstructor()) 555 Class->setHasTrivialConstructor(false); 556 557 // C++ [class.copy]p6: 558 // A copy constructor is trivial if all the direct base classes of its 559 // class have trivial copy constructors. 560 if (!BaseClass->hasTrivialCopyConstructor()) 561 Class->setHasTrivialCopyConstructor(false); 562 563 // C++ [class.copy]p11: 564 // A copy assignment operator is trivial if all the direct base classes 565 // of its class have trivial copy assignment operators. 566 if (!BaseClass->hasTrivialCopyAssignment()) 567 Class->setHasTrivialCopyAssignment(false); 568 } 569 570 // C++ [class.ctor]p3: 571 // A destructor is trivial if all the direct base classes of its class 572 // have trivial destructors. 573 if (!BaseClass->hasTrivialDestructor()) 574 Class->setHasTrivialDestructor(false); 575} 576 577/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 578/// one entry in the base class list of a class specifier, for 579/// example: 580/// class foo : public bar, virtual private baz { 581/// 'public bar' and 'virtual private baz' are each base-specifiers. 582Sema::BaseResult 583Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 584 bool Virtual, AccessSpecifier Access, 585 TypeTy *basetype, SourceLocation BaseLoc) { 586 if (!classdecl) 587 return true; 588 589 AdjustDeclIfTemplate(classdecl); 590 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 591 if (!Class) 592 return true; 593 594 QualType BaseType = GetTypeFromParser(basetype); 595 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 596 Virtual, Access, 597 BaseType, BaseLoc)) 598 return BaseSpec; 599 600 return true; 601} 602 603/// \brief Performs the actual work of attaching the given base class 604/// specifiers to a C++ class. 605bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 606 unsigned NumBases) { 607 if (NumBases == 0) 608 return false; 609 610 // Used to keep track of which base types we have already seen, so 611 // that we can properly diagnose redundant direct base types. Note 612 // that the key is always the unqualified canonical type of the base 613 // class. 614 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 615 616 // Copy non-redundant base specifiers into permanent storage. 617 unsigned NumGoodBases = 0; 618 bool Invalid = false; 619 for (unsigned idx = 0; idx < NumBases; ++idx) { 620 QualType NewBaseType 621 = Context.getCanonicalType(Bases[idx]->getType()); 622 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 623 624 if (KnownBaseTypes[NewBaseType]) { 625 // C++ [class.mi]p3: 626 // A class shall not be specified as a direct base class of a 627 // derived class more than once. 628 Diag(Bases[idx]->getSourceRange().getBegin(), 629 diag::err_duplicate_base_class) 630 << KnownBaseTypes[NewBaseType]->getType() 631 << Bases[idx]->getSourceRange(); 632 633 // Delete the duplicate base class specifier; we're going to 634 // overwrite its pointer later. 635 Context.Deallocate(Bases[idx]); 636 637 Invalid = true; 638 } else { 639 // Okay, add this new base class. 640 KnownBaseTypes[NewBaseType] = Bases[idx]; 641 Bases[NumGoodBases++] = Bases[idx]; 642 } 643 } 644 645 // Attach the remaining base class specifiers to the derived class. 646 Class->setBases(Bases, NumGoodBases); 647 648 // Delete the remaining (good) base class specifiers, since their 649 // data has been copied into the CXXRecordDecl. 650 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 651 Context.Deallocate(Bases[idx]); 652 653 return Invalid; 654} 655 656/// ActOnBaseSpecifiers - Attach the given base specifiers to the 657/// class, after checking whether there are any duplicate base 658/// classes. 659void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 660 unsigned NumBases) { 661 if (!ClassDecl || !Bases || !NumBases) 662 return; 663 664 AdjustDeclIfTemplate(ClassDecl); 665 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 666 (CXXBaseSpecifier**)(Bases), NumBases); 667} 668 669static CXXRecordDecl *GetClassForType(QualType T) { 670 if (const RecordType *RT = T->getAs<RecordType>()) 671 return cast<CXXRecordDecl>(RT->getDecl()); 672 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 673 return ICT->getDecl(); 674 else 675 return 0; 676} 677 678/// \brief Determine whether the type \p Derived is a C++ class that is 679/// derived from the type \p Base. 680bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 681 if (!getLangOptions().CPlusPlus) 682 return false; 683 684 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 685 if (!DerivedRD) 686 return false; 687 688 CXXRecordDecl *BaseRD = GetClassForType(Base); 689 if (!BaseRD) 690 return false; 691 692 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 693 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 694} 695 696/// \brief Determine whether the type \p Derived is a C++ class that is 697/// derived from the type \p Base. 698bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 699 if (!getLangOptions().CPlusPlus) 700 return false; 701 702 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 703 if (!DerivedRD) 704 return false; 705 706 CXXRecordDecl *BaseRD = GetClassForType(Base); 707 if (!BaseRD) 708 return false; 709 710 return DerivedRD->isDerivedFrom(BaseRD, Paths); 711} 712 713/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 714/// conversion (where Derived and Base are class types) is 715/// well-formed, meaning that the conversion is unambiguous (and 716/// that all of the base classes are accessible). Returns true 717/// and emits a diagnostic if the code is ill-formed, returns false 718/// otherwise. Loc is the location where this routine should point to 719/// if there is an error, and Range is the source range to highlight 720/// if there is an error. 721bool 722Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 723 unsigned InaccessibleBaseID, 724 unsigned AmbigiousBaseConvID, 725 SourceLocation Loc, SourceRange Range, 726 DeclarationName Name) { 727 // First, determine whether the path from Derived to Base is 728 // ambiguous. This is slightly more expensive than checking whether 729 // the Derived to Base conversion exists, because here we need to 730 // explore multiple paths to determine if there is an ambiguity. 731 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 732 /*DetectVirtual=*/false); 733 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 734 assert(DerivationOkay && 735 "Can only be used with a derived-to-base conversion"); 736 (void)DerivationOkay; 737 738 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 739 if (!InaccessibleBaseID) 740 return false; 741 742 // Check that the base class can be accessed. 743 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 744 InaccessibleBaseID)) { 745 case AR_accessible: return false; 746 case AR_inaccessible: return true; 747 case AR_dependent: return false; 748 case AR_delayed: return false; 749 } 750 } 751 752 // We know that the derived-to-base conversion is ambiguous, and 753 // we're going to produce a diagnostic. Perform the derived-to-base 754 // search just one more time to compute all of the possible paths so 755 // that we can print them out. This is more expensive than any of 756 // the previous derived-to-base checks we've done, but at this point 757 // performance isn't as much of an issue. 758 Paths.clear(); 759 Paths.setRecordingPaths(true); 760 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 761 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 762 (void)StillOkay; 763 764 // Build up a textual representation of the ambiguous paths, e.g., 765 // D -> B -> A, that will be used to illustrate the ambiguous 766 // conversions in the diagnostic. We only print one of the paths 767 // to each base class subobject. 768 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 769 770 Diag(Loc, AmbigiousBaseConvID) 771 << Derived << Base << PathDisplayStr << Range << Name; 772 return true; 773} 774 775bool 776Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 777 SourceLocation Loc, SourceRange Range, 778 bool IgnoreAccess) { 779 return CheckDerivedToBaseConversion(Derived, Base, 780 IgnoreAccess ? 0 781 : diag::err_upcast_to_inaccessible_base, 782 diag::err_ambiguous_derived_to_base_conv, 783 Loc, Range, DeclarationName()); 784} 785 786 787/// @brief Builds a string representing ambiguous paths from a 788/// specific derived class to different subobjects of the same base 789/// class. 790/// 791/// This function builds a string that can be used in error messages 792/// to show the different paths that one can take through the 793/// inheritance hierarchy to go from the derived class to different 794/// subobjects of a base class. The result looks something like this: 795/// @code 796/// struct D -> struct B -> struct A 797/// struct D -> struct C -> struct A 798/// @endcode 799std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 800 std::string PathDisplayStr; 801 std::set<unsigned> DisplayedPaths; 802 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 803 Path != Paths.end(); ++Path) { 804 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 805 // We haven't displayed a path to this particular base 806 // class subobject yet. 807 PathDisplayStr += "\n "; 808 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 809 for (CXXBasePath::const_iterator Element = Path->begin(); 810 Element != Path->end(); ++Element) 811 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 812 } 813 } 814 815 return PathDisplayStr; 816} 817 818//===----------------------------------------------------------------------===// 819// C++ class member Handling 820//===----------------------------------------------------------------------===// 821 822/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 823/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 824/// bitfield width if there is one and 'InitExpr' specifies the initializer if 825/// any. 826Sema::DeclPtrTy 827Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 828 MultiTemplateParamsArg TemplateParameterLists, 829 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 830 bool Deleted) { 831 const DeclSpec &DS = D.getDeclSpec(); 832 DeclarationName Name = GetNameForDeclarator(D); 833 Expr *BitWidth = static_cast<Expr*>(BW); 834 Expr *Init = static_cast<Expr*>(InitExpr); 835 SourceLocation Loc = D.getIdentifierLoc(); 836 837 bool isFunc = D.isFunctionDeclarator(); 838 839 assert(!DS.isFriendSpecified()); 840 841 // C++ 9.2p6: A member shall not be declared to have automatic storage 842 // duration (auto, register) or with the extern storage-class-specifier. 843 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 844 // data members and cannot be applied to names declared const or static, 845 // and cannot be applied to reference members. 846 switch (DS.getStorageClassSpec()) { 847 case DeclSpec::SCS_unspecified: 848 case DeclSpec::SCS_typedef: 849 case DeclSpec::SCS_static: 850 // FALL THROUGH. 851 break; 852 case DeclSpec::SCS_mutable: 853 if (isFunc) { 854 if (DS.getStorageClassSpecLoc().isValid()) 855 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 856 else 857 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 858 859 // FIXME: It would be nicer if the keyword was ignored only for this 860 // declarator. Otherwise we could get follow-up errors. 861 D.getMutableDeclSpec().ClearStorageClassSpecs(); 862 } else { 863 QualType T = GetTypeForDeclarator(D, S); 864 diag::kind err = static_cast<diag::kind>(0); 865 if (T->isReferenceType()) 866 err = diag::err_mutable_reference; 867 else if (T.isConstQualified()) 868 err = diag::err_mutable_const; 869 if (err != 0) { 870 if (DS.getStorageClassSpecLoc().isValid()) 871 Diag(DS.getStorageClassSpecLoc(), err); 872 else 873 Diag(DS.getThreadSpecLoc(), err); 874 // FIXME: It would be nicer if the keyword was ignored only for this 875 // declarator. Otherwise we could get follow-up errors. 876 D.getMutableDeclSpec().ClearStorageClassSpecs(); 877 } 878 } 879 break; 880 default: 881 if (DS.getStorageClassSpecLoc().isValid()) 882 Diag(DS.getStorageClassSpecLoc(), 883 diag::err_storageclass_invalid_for_member); 884 else 885 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 886 D.getMutableDeclSpec().ClearStorageClassSpecs(); 887 } 888 889 if (!isFunc && 890 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 891 D.getNumTypeObjects() == 0) { 892 // Check also for this case: 893 // 894 // typedef int f(); 895 // f a; 896 // 897 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 898 isFunc = TDType->isFunctionType(); 899 } 900 901 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 902 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 903 !isFunc); 904 905 Decl *Member; 906 if (isInstField) { 907 // FIXME: Check for template parameters! 908 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 909 AS); 910 assert(Member && "HandleField never returns null"); 911 } else { 912 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 913 .getAs<Decl>(); 914 if (!Member) { 915 if (BitWidth) DeleteExpr(BitWidth); 916 return DeclPtrTy(); 917 } 918 919 // Non-instance-fields can't have a bitfield. 920 if (BitWidth) { 921 if (Member->isInvalidDecl()) { 922 // don't emit another diagnostic. 923 } else if (isa<VarDecl>(Member)) { 924 // C++ 9.6p3: A bit-field shall not be a static member. 925 // "static member 'A' cannot be a bit-field" 926 Diag(Loc, diag::err_static_not_bitfield) 927 << Name << BitWidth->getSourceRange(); 928 } else if (isa<TypedefDecl>(Member)) { 929 // "typedef member 'x' cannot be a bit-field" 930 Diag(Loc, diag::err_typedef_not_bitfield) 931 << Name << BitWidth->getSourceRange(); 932 } else { 933 // A function typedef ("typedef int f(); f a;"). 934 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 935 Diag(Loc, diag::err_not_integral_type_bitfield) 936 << Name << cast<ValueDecl>(Member)->getType() 937 << BitWidth->getSourceRange(); 938 } 939 940 DeleteExpr(BitWidth); 941 BitWidth = 0; 942 Member->setInvalidDecl(); 943 } 944 945 Member->setAccess(AS); 946 947 // If we have declared a member function template, set the access of the 948 // templated declaration as well. 949 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 950 FunTmpl->getTemplatedDecl()->setAccess(AS); 951 } 952 953 assert((Name || isInstField) && "No identifier for non-field ?"); 954 955 if (Init) 956 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 957 if (Deleted) // FIXME: Source location is not very good. 958 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 959 960 if (isInstField) { 961 FieldCollector->Add(cast<FieldDecl>(Member)); 962 return DeclPtrTy(); 963 } 964 return DeclPtrTy::make(Member); 965} 966 967/// \brief Find the direct and/or virtual base specifiers that 968/// correspond to the given base type, for use in base initialization 969/// within a constructor. 970static bool FindBaseInitializer(Sema &SemaRef, 971 CXXRecordDecl *ClassDecl, 972 QualType BaseType, 973 const CXXBaseSpecifier *&DirectBaseSpec, 974 const CXXBaseSpecifier *&VirtualBaseSpec) { 975 // First, check for a direct base class. 976 DirectBaseSpec = 0; 977 for (CXXRecordDecl::base_class_const_iterator Base 978 = ClassDecl->bases_begin(); 979 Base != ClassDecl->bases_end(); ++Base) { 980 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 981 // We found a direct base of this type. That's what we're 982 // initializing. 983 DirectBaseSpec = &*Base; 984 break; 985 } 986 } 987 988 // Check for a virtual base class. 989 // FIXME: We might be able to short-circuit this if we know in advance that 990 // there are no virtual bases. 991 VirtualBaseSpec = 0; 992 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 993 // We haven't found a base yet; search the class hierarchy for a 994 // virtual base class. 995 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 996 /*DetectVirtual=*/false); 997 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 998 BaseType, Paths)) { 999 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1000 Path != Paths.end(); ++Path) { 1001 if (Path->back().Base->isVirtual()) { 1002 VirtualBaseSpec = Path->back().Base; 1003 break; 1004 } 1005 } 1006 } 1007 } 1008 1009 return DirectBaseSpec || VirtualBaseSpec; 1010} 1011 1012/// ActOnMemInitializer - Handle a C++ member initializer. 1013Sema::MemInitResult 1014Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1015 Scope *S, 1016 CXXScopeSpec &SS, 1017 IdentifierInfo *MemberOrBase, 1018 TypeTy *TemplateTypeTy, 1019 SourceLocation IdLoc, 1020 SourceLocation LParenLoc, 1021 ExprTy **Args, unsigned NumArgs, 1022 SourceLocation *CommaLocs, 1023 SourceLocation RParenLoc) { 1024 if (!ConstructorD) 1025 return true; 1026 1027 AdjustDeclIfTemplate(ConstructorD); 1028 1029 CXXConstructorDecl *Constructor 1030 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1031 if (!Constructor) { 1032 // The user wrote a constructor initializer on a function that is 1033 // not a C++ constructor. Ignore the error for now, because we may 1034 // have more member initializers coming; we'll diagnose it just 1035 // once in ActOnMemInitializers. 1036 return true; 1037 } 1038 1039 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1040 1041 // C++ [class.base.init]p2: 1042 // Names in a mem-initializer-id are looked up in the scope of the 1043 // constructor’s class and, if not found in that scope, are looked 1044 // up in the scope containing the constructor’s 1045 // definition. [Note: if the constructor’s class contains a member 1046 // with the same name as a direct or virtual base class of the 1047 // class, a mem-initializer-id naming the member or base class and 1048 // composed of a single identifier refers to the class member. A 1049 // mem-initializer-id for the hidden base class may be specified 1050 // using a qualified name. ] 1051 if (!SS.getScopeRep() && !TemplateTypeTy) { 1052 // Look for a member, first. 1053 FieldDecl *Member = 0; 1054 DeclContext::lookup_result Result 1055 = ClassDecl->lookup(MemberOrBase); 1056 if (Result.first != Result.second) 1057 Member = dyn_cast<FieldDecl>(*Result.first); 1058 1059 // FIXME: Handle members of an anonymous union. 1060 1061 if (Member) 1062 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1063 LParenLoc, RParenLoc); 1064 } 1065 // It didn't name a member, so see if it names a class. 1066 QualType BaseType; 1067 TypeSourceInfo *TInfo = 0; 1068 1069 if (TemplateTypeTy) { 1070 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1071 } else { 1072 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1073 LookupParsedName(R, S, &SS); 1074 1075 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1076 if (!TyD) { 1077 if (R.isAmbiguous()) return true; 1078 1079 // We don't want access-control diagnostics here. 1080 R.suppressDiagnostics(); 1081 1082 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1083 bool NotUnknownSpecialization = false; 1084 DeclContext *DC = computeDeclContext(SS, false); 1085 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1086 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1087 1088 if (!NotUnknownSpecialization) { 1089 // When the scope specifier can refer to a member of an unknown 1090 // specialization, we take it as a type name. 1091 BaseType = CheckTypenameType(ETK_None, 1092 (NestedNameSpecifier *)SS.getScopeRep(), 1093 *MemberOrBase, SS.getRange()); 1094 if (BaseType.isNull()) 1095 return true; 1096 1097 R.clear(); 1098 } 1099 } 1100 1101 // If no results were found, try to correct typos. 1102 if (R.empty() && BaseType.isNull() && 1103 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1104 R.isSingleResult()) { 1105 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1106 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1107 // We have found a non-static data member with a similar 1108 // name to what was typed; complain and initialize that 1109 // member. 1110 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1111 << MemberOrBase << true << R.getLookupName() 1112 << FixItHint::CreateReplacement(R.getNameLoc(), 1113 R.getLookupName().getAsString()); 1114 Diag(Member->getLocation(), diag::note_previous_decl) 1115 << Member->getDeclName(); 1116 1117 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1118 LParenLoc, RParenLoc); 1119 } 1120 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1121 const CXXBaseSpecifier *DirectBaseSpec; 1122 const CXXBaseSpecifier *VirtualBaseSpec; 1123 if (FindBaseInitializer(*this, ClassDecl, 1124 Context.getTypeDeclType(Type), 1125 DirectBaseSpec, VirtualBaseSpec)) { 1126 // We have found a direct or virtual base class with a 1127 // similar name to what was typed; complain and initialize 1128 // that base class. 1129 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1130 << MemberOrBase << false << R.getLookupName() 1131 << FixItHint::CreateReplacement(R.getNameLoc(), 1132 R.getLookupName().getAsString()); 1133 1134 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1135 : VirtualBaseSpec; 1136 Diag(BaseSpec->getSourceRange().getBegin(), 1137 diag::note_base_class_specified_here) 1138 << BaseSpec->getType() 1139 << BaseSpec->getSourceRange(); 1140 1141 TyD = Type; 1142 } 1143 } 1144 } 1145 1146 if (!TyD && BaseType.isNull()) { 1147 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1148 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1149 return true; 1150 } 1151 } 1152 1153 if (BaseType.isNull()) { 1154 BaseType = Context.getTypeDeclType(TyD); 1155 if (SS.isSet()) { 1156 NestedNameSpecifier *Qualifier = 1157 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1158 1159 // FIXME: preserve source range information 1160 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1161 } 1162 } 1163 } 1164 1165 if (!TInfo) 1166 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1167 1168 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1169 LParenLoc, RParenLoc, ClassDecl); 1170} 1171 1172/// Checks an initializer expression for use of uninitialized fields, such as 1173/// containing the field that is being initialized. Returns true if there is an 1174/// uninitialized field was used an updates the SourceLocation parameter; false 1175/// otherwise. 1176static bool InitExprContainsUninitializedFields(const Stmt* S, 1177 const FieldDecl* LhsField, 1178 SourceLocation* L) { 1179 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1180 if (ME) { 1181 const NamedDecl* RhsField = ME->getMemberDecl(); 1182 if (RhsField == LhsField) { 1183 // Initializing a field with itself. Throw a warning. 1184 // But wait; there are exceptions! 1185 // Exception #1: The field may not belong to this record. 1186 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1187 const Expr* base = ME->getBase(); 1188 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1189 // Even though the field matches, it does not belong to this record. 1190 return false; 1191 } 1192 // None of the exceptions triggered; return true to indicate an 1193 // uninitialized field was used. 1194 *L = ME->getMemberLoc(); 1195 return true; 1196 } 1197 } 1198 bool found = false; 1199 for (Stmt::const_child_iterator it = S->child_begin(); 1200 it != S->child_end() && found == false; 1201 ++it) { 1202 if (isa<CallExpr>(S)) { 1203 // Do not descend into function calls or constructors, as the use 1204 // of an uninitialized field may be valid. One would have to inspect 1205 // the contents of the function/ctor to determine if it is safe or not. 1206 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1207 // may be safe, depending on what the function/ctor does. 1208 continue; 1209 } 1210 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1211 } 1212 return found; 1213} 1214 1215Sema::MemInitResult 1216Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1217 unsigned NumArgs, SourceLocation IdLoc, 1218 SourceLocation LParenLoc, 1219 SourceLocation RParenLoc) { 1220 // Diagnose value-uses of fields to initialize themselves, e.g. 1221 // foo(foo) 1222 // where foo is not also a parameter to the constructor. 1223 // TODO: implement -Wuninitialized and fold this into that framework. 1224 for (unsigned i = 0; i < NumArgs; ++i) { 1225 SourceLocation L; 1226 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1227 // FIXME: Return true in the case when other fields are used before being 1228 // uninitialized. For example, let this field be the i'th field. When 1229 // initializing the i'th field, throw a warning if any of the >= i'th 1230 // fields are used, as they are not yet initialized. 1231 // Right now we are only handling the case where the i'th field uses 1232 // itself in its initializer. 1233 Diag(L, diag::warn_field_is_uninit); 1234 } 1235 } 1236 1237 bool HasDependentArg = false; 1238 for (unsigned i = 0; i < NumArgs; i++) 1239 HasDependentArg |= Args[i]->isTypeDependent(); 1240 1241 QualType FieldType = Member->getType(); 1242 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1243 FieldType = Array->getElementType(); 1244 if (FieldType->isDependentType() || HasDependentArg) { 1245 // Can't check initialization for a member of dependent type or when 1246 // any of the arguments are type-dependent expressions. 1247 OwningExprResult Init 1248 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1249 RParenLoc)); 1250 1251 // Erase any temporaries within this evaluation context; we're not 1252 // going to track them in the AST, since we'll be rebuilding the 1253 // ASTs during template instantiation. 1254 ExprTemporaries.erase( 1255 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1256 ExprTemporaries.end()); 1257 1258 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1259 LParenLoc, 1260 Init.takeAs<Expr>(), 1261 RParenLoc); 1262 1263 } 1264 1265 if (Member->isInvalidDecl()) 1266 return true; 1267 1268 // Initialize the member. 1269 InitializedEntity MemberEntity = 1270 InitializedEntity::InitializeMember(Member, 0); 1271 InitializationKind Kind = 1272 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1273 1274 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1275 1276 OwningExprResult MemberInit = 1277 InitSeq.Perform(*this, MemberEntity, Kind, 1278 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1279 if (MemberInit.isInvalid()) 1280 return true; 1281 1282 // C++0x [class.base.init]p7: 1283 // The initialization of each base and member constitutes a 1284 // full-expression. 1285 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1286 if (MemberInit.isInvalid()) 1287 return true; 1288 1289 // If we are in a dependent context, template instantiation will 1290 // perform this type-checking again. Just save the arguments that we 1291 // received in a ParenListExpr. 1292 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1293 // of the information that we have about the member 1294 // initializer. However, deconstructing the ASTs is a dicey process, 1295 // and this approach is far more likely to get the corner cases right. 1296 if (CurContext->isDependentContext()) { 1297 // Bump the reference count of all of the arguments. 1298 for (unsigned I = 0; I != NumArgs; ++I) 1299 Args[I]->Retain(); 1300 1301 OwningExprResult Init 1302 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1303 RParenLoc)); 1304 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1305 LParenLoc, 1306 Init.takeAs<Expr>(), 1307 RParenLoc); 1308 } 1309 1310 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1311 LParenLoc, 1312 MemberInit.takeAs<Expr>(), 1313 RParenLoc); 1314} 1315 1316Sema::MemInitResult 1317Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1318 Expr **Args, unsigned NumArgs, 1319 SourceLocation LParenLoc, SourceLocation RParenLoc, 1320 CXXRecordDecl *ClassDecl) { 1321 bool HasDependentArg = false; 1322 for (unsigned i = 0; i < NumArgs; i++) 1323 HasDependentArg |= Args[i]->isTypeDependent(); 1324 1325 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1326 if (BaseType->isDependentType() || HasDependentArg) { 1327 // Can't check initialization for a base of dependent type or when 1328 // any of the arguments are type-dependent expressions. 1329 OwningExprResult BaseInit 1330 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1331 RParenLoc)); 1332 1333 // Erase any temporaries within this evaluation context; we're not 1334 // going to track them in the AST, since we'll be rebuilding the 1335 // ASTs during template instantiation. 1336 ExprTemporaries.erase( 1337 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1338 ExprTemporaries.end()); 1339 1340 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1341 /*IsVirtual=*/false, 1342 LParenLoc, 1343 BaseInit.takeAs<Expr>(), 1344 RParenLoc); 1345 } 1346 1347 if (!BaseType->isRecordType()) 1348 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1349 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1350 1351 // C++ [class.base.init]p2: 1352 // [...] Unless the mem-initializer-id names a nonstatic data 1353 // member of the constructor’s class or a direct or virtual base 1354 // of that class, the mem-initializer is ill-formed. A 1355 // mem-initializer-list can initialize a base class using any 1356 // name that denotes that base class type. 1357 1358 // Check for direct and virtual base classes. 1359 const CXXBaseSpecifier *DirectBaseSpec = 0; 1360 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1361 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1362 VirtualBaseSpec); 1363 1364 // C++ [base.class.init]p2: 1365 // If a mem-initializer-id is ambiguous because it designates both 1366 // a direct non-virtual base class and an inherited virtual base 1367 // class, the mem-initializer is ill-formed. 1368 if (DirectBaseSpec && VirtualBaseSpec) 1369 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1370 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1371 // C++ [base.class.init]p2: 1372 // Unless the mem-initializer-id names a nonstatic data membeer of the 1373 // constructor's class ot a direst or virtual base of that class, the 1374 // mem-initializer is ill-formed. 1375 if (!DirectBaseSpec && !VirtualBaseSpec) 1376 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1377 << BaseType << ClassDecl->getNameAsCString() 1378 << BaseTInfo->getTypeLoc().getSourceRange(); 1379 1380 CXXBaseSpecifier *BaseSpec 1381 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1382 if (!BaseSpec) 1383 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1384 1385 // Initialize the base. 1386 InitializedEntity BaseEntity = 1387 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1388 InitializationKind Kind = 1389 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1390 1391 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1392 1393 OwningExprResult BaseInit = 1394 InitSeq.Perform(*this, BaseEntity, Kind, 1395 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1396 if (BaseInit.isInvalid()) 1397 return true; 1398 1399 // C++0x [class.base.init]p7: 1400 // The initialization of each base and member constitutes a 1401 // full-expression. 1402 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1403 if (BaseInit.isInvalid()) 1404 return true; 1405 1406 // If we are in a dependent context, template instantiation will 1407 // perform this type-checking again. Just save the arguments that we 1408 // received in a ParenListExpr. 1409 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1410 // of the information that we have about the base 1411 // initializer. However, deconstructing the ASTs is a dicey process, 1412 // and this approach is far more likely to get the corner cases right. 1413 if (CurContext->isDependentContext()) { 1414 // Bump the reference count of all of the arguments. 1415 for (unsigned I = 0; I != NumArgs; ++I) 1416 Args[I]->Retain(); 1417 1418 OwningExprResult Init 1419 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1420 RParenLoc)); 1421 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1422 BaseSpec->isVirtual(), 1423 LParenLoc, 1424 Init.takeAs<Expr>(), 1425 RParenLoc); 1426 } 1427 1428 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1429 BaseSpec->isVirtual(), 1430 LParenLoc, 1431 BaseInit.takeAs<Expr>(), 1432 RParenLoc); 1433} 1434 1435/// ImplicitInitializerKind - How an implicit base or member initializer should 1436/// initialize its base or member. 1437enum ImplicitInitializerKind { 1438 IIK_Default, 1439 IIK_Copy, 1440 IIK_Move 1441}; 1442 1443static bool 1444BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1445 ImplicitInitializerKind ImplicitInitKind, 1446 CXXBaseSpecifier *BaseSpec, 1447 bool IsInheritedVirtualBase, 1448 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1449 InitializedEntity InitEntity 1450 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1451 IsInheritedVirtualBase); 1452 1453 Sema::OwningExprResult BaseInit(SemaRef); 1454 1455 switch (ImplicitInitKind) { 1456 case IIK_Default: { 1457 InitializationKind InitKind 1458 = InitializationKind::CreateDefault(Constructor->getLocation()); 1459 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1460 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1461 Sema::MultiExprArg(SemaRef, 0, 0)); 1462 break; 1463 } 1464 1465 case IIK_Copy: { 1466 ParmVarDecl *Param = Constructor->getParamDecl(0); 1467 QualType ParamType = Param->getType().getNonReferenceType(); 1468 1469 Expr *CopyCtorArg = 1470 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1471 SourceLocation(), ParamType, 0); 1472 1473 InitializationKind InitKind 1474 = InitializationKind::CreateDirect(Constructor->getLocation(), 1475 SourceLocation(), SourceLocation()); 1476 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1477 &CopyCtorArg, 1); 1478 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1479 Sema::MultiExprArg(SemaRef, 1480 (void**)&CopyCtorArg, 1)); 1481 break; 1482 } 1483 1484 case IIK_Move: 1485 assert(false && "Unhandled initializer kind!"); 1486 } 1487 1488 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1489 if (BaseInit.isInvalid()) 1490 return true; 1491 1492 CXXBaseInit = 1493 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1494 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1495 SourceLocation()), 1496 BaseSpec->isVirtual(), 1497 SourceLocation(), 1498 BaseInit.takeAs<Expr>(), 1499 SourceLocation()); 1500 1501 return false; 1502} 1503 1504static bool 1505BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1506 ImplicitInitializerKind ImplicitInitKind, 1507 FieldDecl *Field, 1508 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1509 if (ImplicitInitKind == IIK_Copy) { 1510 ParmVarDecl *Param = Constructor->getParamDecl(0); 1511 QualType ParamType = Param->getType().getNonReferenceType(); 1512 1513 Expr *MemberExprBase = 1514 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1515 SourceLocation(), ParamType, 0); 1516 1517 1518 Expr *CopyCtorArg = 1519 MemberExpr::Create(SemaRef.Context, MemberExprBase, /*IsArrow=*/false, 1520 0, SourceRange(), Field, 1521 DeclAccessPair::make(Field, Field->getAccess()), 1522 SourceLocation(), 0, 1523 Field->getType().getNonReferenceType()); 1524 1525 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1526 InitializationKind InitKind = 1527 InitializationKind::CreateDirect(Constructor->getLocation(), 1528 SourceLocation(), SourceLocation()); 1529 1530 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1531 &CopyCtorArg, 1); 1532 1533 Sema::OwningExprResult MemberInit = 1534 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1535 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArg, 1), 0); 1536 if (MemberInit.isInvalid()) 1537 return true; 1538 1539 CXXMemberInit = 0; 1540 return false; 1541 } 1542 1543 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1544 1545 QualType FieldBaseElementType = 1546 SemaRef.Context.getBaseElementType(Field->getType()); 1547 1548 if (FieldBaseElementType->isRecordType()) { 1549 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1550 InitializationKind InitKind = 1551 InitializationKind::CreateDefault(Constructor->getLocation()); 1552 1553 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1554 Sema::OwningExprResult MemberInit = 1555 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1556 Sema::MultiExprArg(SemaRef, 0, 0)); 1557 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1558 if (MemberInit.isInvalid()) 1559 return true; 1560 1561 CXXMemberInit = 1562 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1563 Field, SourceLocation(), 1564 SourceLocation(), 1565 MemberInit.takeAs<Expr>(), 1566 SourceLocation()); 1567 return false; 1568 } 1569 1570 if (FieldBaseElementType->isReferenceType()) { 1571 SemaRef.Diag(Constructor->getLocation(), 1572 diag::err_uninitialized_member_in_ctor) 1573 << (int)Constructor->isImplicit() 1574 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1575 << 0 << Field->getDeclName(); 1576 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1577 return true; 1578 } 1579 1580 if (FieldBaseElementType.isConstQualified()) { 1581 SemaRef.Diag(Constructor->getLocation(), 1582 diag::err_uninitialized_member_in_ctor) 1583 << (int)Constructor->isImplicit() 1584 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1585 << 1 << Field->getDeclName(); 1586 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1587 return true; 1588 } 1589 1590 // Nothing to initialize. 1591 CXXMemberInit = 0; 1592 return false; 1593} 1594 1595bool 1596Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1597 CXXBaseOrMemberInitializer **Initializers, 1598 unsigned NumInitializers, 1599 bool AnyErrors) { 1600 if (Constructor->getDeclContext()->isDependentContext()) { 1601 // Just store the initializers as written, they will be checked during 1602 // instantiation. 1603 if (NumInitializers > 0) { 1604 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1605 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1606 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1607 memcpy(baseOrMemberInitializers, Initializers, 1608 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1609 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1610 } 1611 1612 return false; 1613 } 1614 1615 ImplicitInitializerKind ImplicitInitKind = IIK_Default; 1616 1617 // FIXME: Handle implicit move constructors. 1618 if (Constructor->isImplicit() && Constructor->isCopyConstructor()) 1619 ImplicitInitKind = IIK_Copy; 1620 1621 // We need to build the initializer AST according to order of construction 1622 // and not what user specified in the Initializers list. 1623 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1624 if (!ClassDecl) 1625 return true; 1626 1627 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1628 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1629 bool HadError = false; 1630 1631 for (unsigned i = 0; i < NumInitializers; i++) { 1632 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1633 1634 if (Member->isBaseInitializer()) 1635 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1636 else 1637 AllBaseFields[Member->getMember()] = Member; 1638 } 1639 1640 // Keep track of the direct virtual bases. 1641 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1642 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1643 E = ClassDecl->bases_end(); I != E; ++I) { 1644 if (I->isVirtual()) 1645 DirectVBases.insert(I); 1646 } 1647 1648 // Push virtual bases before others. 1649 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1650 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1651 1652 if (CXXBaseOrMemberInitializer *Value 1653 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1654 AllToInit.push_back(Value); 1655 } else if (!AnyErrors) { 1656 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1657 CXXBaseOrMemberInitializer *CXXBaseInit; 1658 if (BuildImplicitBaseInitializer(*this, Constructor, ImplicitInitKind, 1659 VBase, IsInheritedVirtualBase, 1660 CXXBaseInit)) { 1661 HadError = true; 1662 continue; 1663 } 1664 1665 AllToInit.push_back(CXXBaseInit); 1666 } 1667 } 1668 1669 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1670 E = ClassDecl->bases_end(); Base != E; ++Base) { 1671 // Virtuals are in the virtual base list and already constructed. 1672 if (Base->isVirtual()) 1673 continue; 1674 1675 if (CXXBaseOrMemberInitializer *Value 1676 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1677 AllToInit.push_back(Value); 1678 } else if (!AnyErrors) { 1679 CXXBaseOrMemberInitializer *CXXBaseInit; 1680 if (BuildImplicitBaseInitializer(*this, Constructor, ImplicitInitKind, 1681 Base, /*IsInheritedVirtualBase=*/false, 1682 CXXBaseInit)) { 1683 HadError = true; 1684 continue; 1685 } 1686 1687 AllToInit.push_back(CXXBaseInit); 1688 } 1689 } 1690 1691 // non-static data members. 1692 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1693 E = ClassDecl->field_end(); Field != E; ++Field) { 1694 if ((*Field)->isAnonymousStructOrUnion()) { 1695 if (const RecordType *FieldClassType = 1696 Field->getType()->getAs<RecordType>()) { 1697 CXXRecordDecl *FieldClassDecl 1698 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1699 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1700 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1701 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1702 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1703 // set to the anonymous union data member used in the initializer 1704 // list. 1705 Value->setMember(*Field); 1706 Value->setAnonUnionMember(*FA); 1707 AllToInit.push_back(Value); 1708 break; 1709 } 1710 } 1711 } 1712 continue; 1713 } 1714 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1715 AllToInit.push_back(Value); 1716 continue; 1717 } 1718 1719 if (AnyErrors) 1720 continue; 1721 1722 CXXBaseOrMemberInitializer *Member; 1723 if (BuildImplicitMemberInitializer(*this, Constructor, ImplicitInitKind, 1724 *Field, Member)) { 1725 HadError = true; 1726 continue; 1727 } 1728 1729 // If the member doesn't need to be initialized, it will be null. 1730 if (Member) 1731 AllToInit.push_back(Member); 1732 } 1733 1734 NumInitializers = AllToInit.size(); 1735 if (NumInitializers > 0) { 1736 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1737 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1738 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1739 memcpy(baseOrMemberInitializers, AllToInit.data(), 1740 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1741 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1742 1743 // Constructors implicitly reference the base and member 1744 // destructors. 1745 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1746 Constructor->getParent()); 1747 } 1748 1749 return HadError; 1750} 1751 1752static void *GetKeyForTopLevelField(FieldDecl *Field) { 1753 // For anonymous unions, use the class declaration as the key. 1754 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1755 if (RT->getDecl()->isAnonymousStructOrUnion()) 1756 return static_cast<void *>(RT->getDecl()); 1757 } 1758 return static_cast<void *>(Field); 1759} 1760 1761static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1762 return Context.getCanonicalType(BaseType).getTypePtr(); 1763} 1764 1765static void *GetKeyForMember(ASTContext &Context, 1766 CXXBaseOrMemberInitializer *Member, 1767 bool MemberMaybeAnon = false) { 1768 if (!Member->isMemberInitializer()) 1769 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1770 1771 // For fields injected into the class via declaration of an anonymous union, 1772 // use its anonymous union class declaration as the unique key. 1773 FieldDecl *Field = Member->getMember(); 1774 1775 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1776 // data member of the class. Data member used in the initializer list is 1777 // in AnonUnionMember field. 1778 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1779 Field = Member->getAnonUnionMember(); 1780 1781 // If the field is a member of an anonymous struct or union, our key 1782 // is the anonymous record decl that's a direct child of the class. 1783 RecordDecl *RD = Field->getParent(); 1784 if (RD->isAnonymousStructOrUnion()) { 1785 while (true) { 1786 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1787 if (Parent->isAnonymousStructOrUnion()) 1788 RD = Parent; 1789 else 1790 break; 1791 } 1792 1793 return static_cast<void *>(RD); 1794 } 1795 1796 return static_cast<void *>(Field); 1797} 1798 1799static void 1800DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1801 const CXXConstructorDecl *Constructor, 1802 CXXBaseOrMemberInitializer **Inits, 1803 unsigned NumInits) { 1804 if (Constructor->getDeclContext()->isDependentContext()) 1805 return; 1806 1807 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1808 == Diagnostic::Ignored) 1809 return; 1810 1811 // Build the list of bases and members in the order that they'll 1812 // actually be initialized. The explicit initializers should be in 1813 // this same order but may be missing things. 1814 llvm::SmallVector<const void*, 32> IdealInitKeys; 1815 1816 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1817 1818 // 1. Virtual bases. 1819 for (CXXRecordDecl::base_class_const_iterator VBase = 1820 ClassDecl->vbases_begin(), 1821 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1822 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 1823 1824 // 2. Non-virtual bases. 1825 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 1826 E = ClassDecl->bases_end(); Base != E; ++Base) { 1827 if (Base->isVirtual()) 1828 continue; 1829 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 1830 } 1831 1832 // 3. Direct fields. 1833 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1834 E = ClassDecl->field_end(); Field != E; ++Field) 1835 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 1836 1837 unsigned NumIdealInits = IdealInitKeys.size(); 1838 unsigned IdealIndex = 0; 1839 1840 CXXBaseOrMemberInitializer *PrevInit = 0; 1841 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 1842 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 1843 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 1844 1845 // Scan forward to try to find this initializer in the idealized 1846 // initializers list. 1847 for (; IdealIndex != NumIdealInits; ++IdealIndex) 1848 if (InitKey == IdealInitKeys[IdealIndex]) 1849 break; 1850 1851 // If we didn't find this initializer, it must be because we 1852 // scanned past it on a previous iteration. That can only 1853 // happen if we're out of order; emit a warning. 1854 if (IdealIndex == NumIdealInits) { 1855 assert(PrevInit && "initializer not found in initializer list"); 1856 1857 Sema::SemaDiagnosticBuilder D = 1858 SemaRef.Diag(PrevInit->getSourceLocation(), 1859 diag::warn_initializer_out_of_order); 1860 1861 if (PrevInit->isMemberInitializer()) 1862 D << 0 << PrevInit->getMember()->getDeclName(); 1863 else 1864 D << 1 << PrevInit->getBaseClassInfo()->getType(); 1865 1866 if (Init->isMemberInitializer()) 1867 D << 0 << Init->getMember()->getDeclName(); 1868 else 1869 D << 1 << Init->getBaseClassInfo()->getType(); 1870 1871 // Move back to the initializer's location in the ideal list. 1872 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 1873 if (InitKey == IdealInitKeys[IdealIndex]) 1874 break; 1875 1876 assert(IdealIndex != NumIdealInits && 1877 "initializer not found in initializer list"); 1878 } 1879 1880 PrevInit = Init; 1881 } 1882} 1883 1884namespace { 1885bool CheckRedundantInit(Sema &S, 1886 CXXBaseOrMemberInitializer *Init, 1887 CXXBaseOrMemberInitializer *&PrevInit) { 1888 if (!PrevInit) { 1889 PrevInit = Init; 1890 return false; 1891 } 1892 1893 if (FieldDecl *Field = Init->getMember()) 1894 S.Diag(Init->getSourceLocation(), 1895 diag::err_multiple_mem_initialization) 1896 << Field->getDeclName() 1897 << Init->getSourceRange(); 1898 else { 1899 Type *BaseClass = Init->getBaseClass(); 1900 assert(BaseClass && "neither field nor base"); 1901 S.Diag(Init->getSourceLocation(), 1902 diag::err_multiple_base_initialization) 1903 << QualType(BaseClass, 0) 1904 << Init->getSourceRange(); 1905 } 1906 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 1907 << 0 << PrevInit->getSourceRange(); 1908 1909 return true; 1910} 1911 1912typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 1913typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 1914 1915bool CheckRedundantUnionInit(Sema &S, 1916 CXXBaseOrMemberInitializer *Init, 1917 RedundantUnionMap &Unions) { 1918 FieldDecl *Field = Init->getMember(); 1919 RecordDecl *Parent = Field->getParent(); 1920 if (!Parent->isAnonymousStructOrUnion()) 1921 return false; 1922 1923 NamedDecl *Child = Field; 1924 do { 1925 if (Parent->isUnion()) { 1926 UnionEntry &En = Unions[Parent]; 1927 if (En.first && En.first != Child) { 1928 S.Diag(Init->getSourceLocation(), 1929 diag::err_multiple_mem_union_initialization) 1930 << Field->getDeclName() 1931 << Init->getSourceRange(); 1932 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 1933 << 0 << En.second->getSourceRange(); 1934 return true; 1935 } else if (!En.first) { 1936 En.first = Child; 1937 En.second = Init; 1938 } 1939 } 1940 1941 Child = Parent; 1942 Parent = cast<RecordDecl>(Parent->getDeclContext()); 1943 } while (Parent->isAnonymousStructOrUnion()); 1944 1945 return false; 1946} 1947} 1948 1949/// ActOnMemInitializers - Handle the member initializers for a constructor. 1950void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1951 SourceLocation ColonLoc, 1952 MemInitTy **meminits, unsigned NumMemInits, 1953 bool AnyErrors) { 1954 if (!ConstructorDecl) 1955 return; 1956 1957 AdjustDeclIfTemplate(ConstructorDecl); 1958 1959 CXXConstructorDecl *Constructor 1960 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1961 1962 if (!Constructor) { 1963 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1964 return; 1965 } 1966 1967 CXXBaseOrMemberInitializer **MemInits = 1968 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 1969 1970 // Mapping for the duplicate initializers check. 1971 // For member initializers, this is keyed with a FieldDecl*. 1972 // For base initializers, this is keyed with a Type*. 1973 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 1974 1975 // Mapping for the inconsistent anonymous-union initializers check. 1976 RedundantUnionMap MemberUnions; 1977 1978 bool HadError = false; 1979 for (unsigned i = 0; i < NumMemInits; i++) { 1980 CXXBaseOrMemberInitializer *Init = MemInits[i]; 1981 1982 if (Init->isMemberInitializer()) { 1983 FieldDecl *Field = Init->getMember(); 1984 if (CheckRedundantInit(*this, Init, Members[Field]) || 1985 CheckRedundantUnionInit(*this, Init, MemberUnions)) 1986 HadError = true; 1987 } else { 1988 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 1989 if (CheckRedundantInit(*this, Init, Members[Key])) 1990 HadError = true; 1991 } 1992 } 1993 1994 if (HadError) 1995 return; 1996 1997 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 1998 1999 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2000} 2001 2002void 2003Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2004 CXXRecordDecl *ClassDecl) { 2005 // Ignore dependent contexts. 2006 if (ClassDecl->isDependentContext()) 2007 return; 2008 2009 // FIXME: all the access-control diagnostics are positioned on the 2010 // field/base declaration. That's probably good; that said, the 2011 // user might reasonably want to know why the destructor is being 2012 // emitted, and we currently don't say. 2013 2014 // Non-static data members. 2015 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2016 E = ClassDecl->field_end(); I != E; ++I) { 2017 FieldDecl *Field = *I; 2018 2019 QualType FieldType = Context.getBaseElementType(Field->getType()); 2020 2021 const RecordType* RT = FieldType->getAs<RecordType>(); 2022 if (!RT) 2023 continue; 2024 2025 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2026 if (FieldClassDecl->hasTrivialDestructor()) 2027 continue; 2028 2029 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 2030 CheckDestructorAccess(Field->getLocation(), Dtor, 2031 PDiag(diag::err_access_dtor_field) 2032 << Field->getDeclName() 2033 << FieldType); 2034 2035 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2036 } 2037 2038 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2039 2040 // Bases. 2041 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2042 E = ClassDecl->bases_end(); Base != E; ++Base) { 2043 // Bases are always records in a well-formed non-dependent class. 2044 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2045 2046 // Remember direct virtual bases. 2047 if (Base->isVirtual()) 2048 DirectVirtualBases.insert(RT); 2049 2050 // Ignore trivial destructors. 2051 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2052 if (BaseClassDecl->hasTrivialDestructor()) 2053 continue; 2054 2055 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2056 2057 // FIXME: caret should be on the start of the class name 2058 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2059 PDiag(diag::err_access_dtor_base) 2060 << Base->getType() 2061 << Base->getSourceRange()); 2062 2063 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2064 } 2065 2066 // Virtual bases. 2067 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2068 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2069 2070 // Bases are always records in a well-formed non-dependent class. 2071 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2072 2073 // Ignore direct virtual bases. 2074 if (DirectVirtualBases.count(RT)) 2075 continue; 2076 2077 // Ignore trivial destructors. 2078 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2079 if (BaseClassDecl->hasTrivialDestructor()) 2080 continue; 2081 2082 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2083 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2084 PDiag(diag::err_access_dtor_vbase) 2085 << VBase->getType()); 2086 2087 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2088 } 2089} 2090 2091void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2092 if (!CDtorDecl) 2093 return; 2094 2095 if (CXXConstructorDecl *Constructor 2096 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2097 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2098} 2099 2100bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2101 unsigned DiagID, AbstractDiagSelID SelID, 2102 const CXXRecordDecl *CurrentRD) { 2103 if (SelID == -1) 2104 return RequireNonAbstractType(Loc, T, 2105 PDiag(DiagID), CurrentRD); 2106 else 2107 return RequireNonAbstractType(Loc, T, 2108 PDiag(DiagID) << SelID, CurrentRD); 2109} 2110 2111bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2112 const PartialDiagnostic &PD, 2113 const CXXRecordDecl *CurrentRD) { 2114 if (!getLangOptions().CPlusPlus) 2115 return false; 2116 2117 if (const ArrayType *AT = Context.getAsArrayType(T)) 2118 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2119 CurrentRD); 2120 2121 if (const PointerType *PT = T->getAs<PointerType>()) { 2122 // Find the innermost pointer type. 2123 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2124 PT = T; 2125 2126 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2127 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2128 } 2129 2130 const RecordType *RT = T->getAs<RecordType>(); 2131 if (!RT) 2132 return false; 2133 2134 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2135 2136 if (CurrentRD && CurrentRD != RD) 2137 return false; 2138 2139 // FIXME: is this reasonable? It matches current behavior, but.... 2140 if (!RD->getDefinition()) 2141 return false; 2142 2143 if (!RD->isAbstract()) 2144 return false; 2145 2146 Diag(Loc, PD) << RD->getDeclName(); 2147 2148 // Check if we've already emitted the list of pure virtual functions for this 2149 // class. 2150 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2151 return true; 2152 2153 CXXFinalOverriderMap FinalOverriders; 2154 RD->getFinalOverriders(FinalOverriders); 2155 2156 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2157 MEnd = FinalOverriders.end(); 2158 M != MEnd; 2159 ++M) { 2160 for (OverridingMethods::iterator SO = M->second.begin(), 2161 SOEnd = M->second.end(); 2162 SO != SOEnd; ++SO) { 2163 // C++ [class.abstract]p4: 2164 // A class is abstract if it contains or inherits at least one 2165 // pure virtual function for which the final overrider is pure 2166 // virtual. 2167 2168 // 2169 if (SO->second.size() != 1) 2170 continue; 2171 2172 if (!SO->second.front().Method->isPure()) 2173 continue; 2174 2175 Diag(SO->second.front().Method->getLocation(), 2176 diag::note_pure_virtual_function) 2177 << SO->second.front().Method->getDeclName(); 2178 } 2179 } 2180 2181 if (!PureVirtualClassDiagSet) 2182 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2183 PureVirtualClassDiagSet->insert(RD); 2184 2185 return true; 2186} 2187 2188namespace { 2189 class AbstractClassUsageDiagnoser 2190 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2191 Sema &SemaRef; 2192 CXXRecordDecl *AbstractClass; 2193 2194 bool VisitDeclContext(const DeclContext *DC) { 2195 bool Invalid = false; 2196 2197 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2198 E = DC->decls_end(); I != E; ++I) 2199 Invalid |= Visit(*I); 2200 2201 return Invalid; 2202 } 2203 2204 public: 2205 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2206 : SemaRef(SemaRef), AbstractClass(ac) { 2207 Visit(SemaRef.Context.getTranslationUnitDecl()); 2208 } 2209 2210 bool VisitFunctionDecl(const FunctionDecl *FD) { 2211 if (FD->isThisDeclarationADefinition()) { 2212 // No need to do the check if we're in a definition, because it requires 2213 // that the return/param types are complete. 2214 // because that requires 2215 return VisitDeclContext(FD); 2216 } 2217 2218 // Check the return type. 2219 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2220 bool Invalid = 2221 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2222 diag::err_abstract_type_in_decl, 2223 Sema::AbstractReturnType, 2224 AbstractClass); 2225 2226 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2227 E = FD->param_end(); I != E; ++I) { 2228 const ParmVarDecl *VD = *I; 2229 Invalid |= 2230 SemaRef.RequireNonAbstractType(VD->getLocation(), 2231 VD->getOriginalType(), 2232 diag::err_abstract_type_in_decl, 2233 Sema::AbstractParamType, 2234 AbstractClass); 2235 } 2236 2237 return Invalid; 2238 } 2239 2240 bool VisitDecl(const Decl* D) { 2241 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2242 return VisitDeclContext(DC); 2243 2244 return false; 2245 } 2246 }; 2247} 2248 2249/// \brief Perform semantic checks on a class definition that has been 2250/// completing, introducing implicitly-declared members, checking for 2251/// abstract types, etc. 2252void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) { 2253 if (!Record || Record->isInvalidDecl()) 2254 return; 2255 2256 if (!Record->isDependentType()) 2257 AddImplicitlyDeclaredMembersToClass(S, Record); 2258 2259 if (Record->isInvalidDecl()) 2260 return; 2261 2262 // Set access bits correctly on the directly-declared conversions. 2263 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2264 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2265 Convs->setAccess(I, (*I)->getAccess()); 2266 2267 // Determine whether we need to check for final overriders. We do 2268 // this either when there are virtual base classes (in which case we 2269 // may end up finding multiple final overriders for a given virtual 2270 // function) or any of the base classes is abstract (in which case 2271 // we might detect that this class is abstract). 2272 bool CheckFinalOverriders = false; 2273 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2274 !Record->isDependentType()) { 2275 if (Record->getNumVBases()) 2276 CheckFinalOverriders = true; 2277 else if (!Record->isAbstract()) { 2278 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2279 BEnd = Record->bases_end(); 2280 B != BEnd; ++B) { 2281 CXXRecordDecl *BaseDecl 2282 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2283 if (BaseDecl->isAbstract()) { 2284 CheckFinalOverriders = true; 2285 break; 2286 } 2287 } 2288 } 2289 } 2290 2291 if (CheckFinalOverriders) { 2292 CXXFinalOverriderMap FinalOverriders; 2293 Record->getFinalOverriders(FinalOverriders); 2294 2295 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2296 MEnd = FinalOverriders.end(); 2297 M != MEnd; ++M) { 2298 for (OverridingMethods::iterator SO = M->second.begin(), 2299 SOEnd = M->second.end(); 2300 SO != SOEnd; ++SO) { 2301 assert(SO->second.size() > 0 && 2302 "All virtual functions have overridding virtual functions"); 2303 if (SO->second.size() == 1) { 2304 // C++ [class.abstract]p4: 2305 // A class is abstract if it contains or inherits at least one 2306 // pure virtual function for which the final overrider is pure 2307 // virtual. 2308 if (SO->second.front().Method->isPure()) 2309 Record->setAbstract(true); 2310 continue; 2311 } 2312 2313 // C++ [class.virtual]p2: 2314 // In a derived class, if a virtual member function of a base 2315 // class subobject has more than one final overrider the 2316 // program is ill-formed. 2317 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2318 << (NamedDecl *)M->first << Record; 2319 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2320 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2321 OMEnd = SO->second.end(); 2322 OM != OMEnd; ++OM) 2323 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2324 << (NamedDecl *)M->first << OM->Method->getParent(); 2325 2326 Record->setInvalidDecl(); 2327 } 2328 } 2329 } 2330 2331 if (Record->isAbstract() && !Record->isInvalidDecl()) 2332 (void)AbstractClassUsageDiagnoser(*this, Record); 2333 2334 // If this is not an aggregate type and has no user-declared constructor, 2335 // complain about any non-static data members of reference or const scalar 2336 // type, since they will never get initializers. 2337 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2338 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2339 bool Complained = false; 2340 for (RecordDecl::field_iterator F = Record->field_begin(), 2341 FEnd = Record->field_end(); 2342 F != FEnd; ++F) { 2343 if (F->getType()->isReferenceType() || 2344 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2345 if (!Complained) { 2346 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2347 << Record->getTagKind() << Record; 2348 Complained = true; 2349 } 2350 2351 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2352 << F->getType()->isReferenceType() 2353 << F->getDeclName(); 2354 } 2355 } 2356 } 2357} 2358 2359void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2360 DeclPtrTy TagDecl, 2361 SourceLocation LBrac, 2362 SourceLocation RBrac, 2363 AttributeList *AttrList) { 2364 if (!TagDecl) 2365 return; 2366 2367 AdjustDeclIfTemplate(TagDecl); 2368 2369 ActOnFields(S, RLoc, TagDecl, 2370 (DeclPtrTy*)FieldCollector->getCurFields(), 2371 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2372 2373 CheckCompletedCXXClass(S, 2374 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2375} 2376 2377/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2378/// special functions, such as the default constructor, copy 2379/// constructor, or destructor, to the given C++ class (C++ 2380/// [special]p1). This routine can only be executed just before the 2381/// definition of the class is complete. 2382/// 2383/// The scope, if provided, is the class scope. 2384void Sema::AddImplicitlyDeclaredMembersToClass(Scope *S, 2385 CXXRecordDecl *ClassDecl) { 2386 CanQualType ClassType 2387 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2388 2389 // FIXME: Implicit declarations have exception specifications, which are 2390 // the union of the specifications of the implicitly called functions. 2391 2392 if (!ClassDecl->hasUserDeclaredConstructor()) { 2393 // C++ [class.ctor]p5: 2394 // A default constructor for a class X is a constructor of class X 2395 // that can be called without an argument. If there is no 2396 // user-declared constructor for class X, a default constructor is 2397 // implicitly declared. An implicitly-declared default constructor 2398 // is an inline public member of its class. 2399 DeclarationName Name 2400 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2401 CXXConstructorDecl *DefaultCon = 2402 CXXConstructorDecl::Create(Context, ClassDecl, 2403 ClassDecl->getLocation(), Name, 2404 Context.getFunctionType(Context.VoidTy, 2405 0, 0, false, 0, 2406 /*FIXME*/false, false, 2407 0, 0, 2408 FunctionType::ExtInfo()), 2409 /*TInfo=*/0, 2410 /*isExplicit=*/false, 2411 /*isInline=*/true, 2412 /*isImplicitlyDeclared=*/true); 2413 DefaultCon->setAccess(AS_public); 2414 DefaultCon->setImplicit(); 2415 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2416 if (S) 2417 PushOnScopeChains(DefaultCon, S, true); 2418 else 2419 ClassDecl->addDecl(DefaultCon); 2420 } 2421 2422 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2423 // C++ [class.copy]p4: 2424 // If the class definition does not explicitly declare a copy 2425 // constructor, one is declared implicitly. 2426 2427 // C++ [class.copy]p5: 2428 // The implicitly-declared copy constructor for a class X will 2429 // have the form 2430 // 2431 // X::X(const X&) 2432 // 2433 // if 2434 bool HasConstCopyConstructor = true; 2435 2436 // -- each direct or virtual base class B of X has a copy 2437 // constructor whose first parameter is of type const B& or 2438 // const volatile B&, and 2439 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2440 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2441 const CXXRecordDecl *BaseClassDecl 2442 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2443 HasConstCopyConstructor 2444 = BaseClassDecl->hasConstCopyConstructor(Context); 2445 } 2446 2447 // -- for all the nonstatic data members of X that are of a 2448 // class type M (or array thereof), each such class type 2449 // has a copy constructor whose first parameter is of type 2450 // const M& or const volatile M&. 2451 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2452 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2453 ++Field) { 2454 QualType FieldType = (*Field)->getType(); 2455 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2456 FieldType = Array->getElementType(); 2457 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2458 const CXXRecordDecl *FieldClassDecl 2459 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2460 HasConstCopyConstructor 2461 = FieldClassDecl->hasConstCopyConstructor(Context); 2462 } 2463 } 2464 2465 // Otherwise, the implicitly declared copy constructor will have 2466 // the form 2467 // 2468 // X::X(X&) 2469 QualType ArgType = ClassType; 2470 if (HasConstCopyConstructor) 2471 ArgType = ArgType.withConst(); 2472 ArgType = Context.getLValueReferenceType(ArgType); 2473 2474 // An implicitly-declared copy constructor is an inline public 2475 // member of its class. 2476 DeclarationName Name 2477 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2478 CXXConstructorDecl *CopyConstructor 2479 = CXXConstructorDecl::Create(Context, ClassDecl, 2480 ClassDecl->getLocation(), Name, 2481 Context.getFunctionType(Context.VoidTy, 2482 &ArgType, 1, 2483 false, 0, 2484 /*FIXME:*/false, 2485 false, 0, 0, 2486 FunctionType::ExtInfo()), 2487 /*TInfo=*/0, 2488 /*isExplicit=*/false, 2489 /*isInline=*/true, 2490 /*isImplicitlyDeclared=*/true); 2491 CopyConstructor->setAccess(AS_public); 2492 CopyConstructor->setImplicit(); 2493 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2494 2495 // Add the parameter to the constructor. 2496 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2497 ClassDecl->getLocation(), 2498 /*IdentifierInfo=*/0, 2499 ArgType, /*TInfo=*/0, 2500 VarDecl::None, 2501 VarDecl::None, 0); 2502 CopyConstructor->setParams(&FromParam, 1); 2503 if (S) 2504 PushOnScopeChains(CopyConstructor, S, true); 2505 else 2506 ClassDecl->addDecl(CopyConstructor); 2507 } 2508 2509 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2510 // Note: The following rules are largely analoguous to the copy 2511 // constructor rules. Note that virtual bases are not taken into account 2512 // for determining the argument type of the operator. Note also that 2513 // operators taking an object instead of a reference are allowed. 2514 // 2515 // C++ [class.copy]p10: 2516 // If the class definition does not explicitly declare a copy 2517 // assignment operator, one is declared implicitly. 2518 // The implicitly-defined copy assignment operator for a class X 2519 // will have the form 2520 // 2521 // X& X::operator=(const X&) 2522 // 2523 // if 2524 bool HasConstCopyAssignment = true; 2525 2526 // -- each direct base class B of X has a copy assignment operator 2527 // whose parameter is of type const B&, const volatile B& or B, 2528 // and 2529 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2530 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2531 assert(!Base->getType()->isDependentType() && 2532 "Cannot generate implicit members for class with dependent bases."); 2533 const CXXRecordDecl *BaseClassDecl 2534 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2535 const CXXMethodDecl *MD = 0; 2536 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2537 MD); 2538 } 2539 2540 // -- for all the nonstatic data members of X that are of a class 2541 // type M (or array thereof), each such class type has a copy 2542 // assignment operator whose parameter is of type const M&, 2543 // const volatile M& or M. 2544 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2545 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2546 ++Field) { 2547 QualType FieldType = (*Field)->getType(); 2548 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2549 FieldType = Array->getElementType(); 2550 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2551 const CXXRecordDecl *FieldClassDecl 2552 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2553 const CXXMethodDecl *MD = 0; 2554 HasConstCopyAssignment 2555 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2556 } 2557 } 2558 2559 // Otherwise, the implicitly declared copy assignment operator will 2560 // have the form 2561 // 2562 // X& X::operator=(X&) 2563 QualType ArgType = ClassType; 2564 QualType RetType = Context.getLValueReferenceType(ArgType); 2565 if (HasConstCopyAssignment) 2566 ArgType = ArgType.withConst(); 2567 ArgType = Context.getLValueReferenceType(ArgType); 2568 2569 // An implicitly-declared copy assignment operator is an inline public 2570 // member of its class. 2571 DeclarationName Name = 2572 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2573 CXXMethodDecl *CopyAssignment = 2574 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2575 Context.getFunctionType(RetType, &ArgType, 1, 2576 false, 0, 2577 /*FIXME:*/false, 2578 false, 0, 0, 2579 FunctionType::ExtInfo()), 2580 /*TInfo=*/0, /*isStatic=*/false, 2581 /*StorageClassAsWritten=*/FunctionDecl::None, 2582 /*isInline=*/true); 2583 CopyAssignment->setAccess(AS_public); 2584 CopyAssignment->setImplicit(); 2585 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2586 CopyAssignment->setCopyAssignment(true); 2587 2588 // Add the parameter to the operator. 2589 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2590 ClassDecl->getLocation(), 2591 /*IdentifierInfo=*/0, 2592 ArgType, /*TInfo=*/0, 2593 VarDecl::None, 2594 VarDecl::None, 0); 2595 CopyAssignment->setParams(&FromParam, 1); 2596 2597 // Don't call addedAssignmentOperator. There is no way to distinguish an 2598 // implicit from an explicit assignment operator. 2599 if (S) 2600 PushOnScopeChains(CopyAssignment, S, true); 2601 else 2602 ClassDecl->addDecl(CopyAssignment); 2603 AddOverriddenMethods(ClassDecl, CopyAssignment); 2604 } 2605 2606 if (!ClassDecl->hasUserDeclaredDestructor()) { 2607 // C++ [class.dtor]p2: 2608 // If a class has no user-declared destructor, a destructor is 2609 // declared implicitly. An implicitly-declared destructor is an 2610 // inline public member of its class. 2611 QualType Ty = Context.getFunctionType(Context.VoidTy, 2612 0, 0, false, 0, 2613 /*FIXME:*/false, 2614 false, 0, 0, FunctionType::ExtInfo()); 2615 2616 DeclarationName Name 2617 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2618 CXXDestructorDecl *Destructor 2619 = CXXDestructorDecl::Create(Context, ClassDecl, 2620 ClassDecl->getLocation(), Name, Ty, 2621 /*isInline=*/true, 2622 /*isImplicitlyDeclared=*/true); 2623 Destructor->setAccess(AS_public); 2624 Destructor->setImplicit(); 2625 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2626 if (S) 2627 PushOnScopeChains(Destructor, S, true); 2628 else 2629 ClassDecl->addDecl(Destructor); 2630 2631 // This could be uniqued if it ever proves significant. 2632 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2633 2634 AddOverriddenMethods(ClassDecl, Destructor); 2635 } 2636} 2637 2638void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2639 Decl *D = TemplateD.getAs<Decl>(); 2640 if (!D) 2641 return; 2642 2643 TemplateParameterList *Params = 0; 2644 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2645 Params = Template->getTemplateParameters(); 2646 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2647 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2648 Params = PartialSpec->getTemplateParameters(); 2649 else 2650 return; 2651 2652 for (TemplateParameterList::iterator Param = Params->begin(), 2653 ParamEnd = Params->end(); 2654 Param != ParamEnd; ++Param) { 2655 NamedDecl *Named = cast<NamedDecl>(*Param); 2656 if (Named->getDeclName()) { 2657 S->AddDecl(DeclPtrTy::make(Named)); 2658 IdResolver.AddDecl(Named); 2659 } 2660 } 2661} 2662 2663void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2664 if (!RecordD) return; 2665 AdjustDeclIfTemplate(RecordD); 2666 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2667 PushDeclContext(S, Record); 2668} 2669 2670void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2671 if (!RecordD) return; 2672 PopDeclContext(); 2673} 2674 2675/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2676/// parsing a top-level (non-nested) C++ class, and we are now 2677/// parsing those parts of the given Method declaration that could 2678/// not be parsed earlier (C++ [class.mem]p2), such as default 2679/// arguments. This action should enter the scope of the given 2680/// Method declaration as if we had just parsed the qualified method 2681/// name. However, it should not bring the parameters into scope; 2682/// that will be performed by ActOnDelayedCXXMethodParameter. 2683void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2684} 2685 2686/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2687/// C++ method declaration. We're (re-)introducing the given 2688/// function parameter into scope for use in parsing later parts of 2689/// the method declaration. For example, we could see an 2690/// ActOnParamDefaultArgument event for this parameter. 2691void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2692 if (!ParamD) 2693 return; 2694 2695 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2696 2697 // If this parameter has an unparsed default argument, clear it out 2698 // to make way for the parsed default argument. 2699 if (Param->hasUnparsedDefaultArg()) 2700 Param->setDefaultArg(0); 2701 2702 S->AddDecl(DeclPtrTy::make(Param)); 2703 if (Param->getDeclName()) 2704 IdResolver.AddDecl(Param); 2705} 2706 2707/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2708/// processing the delayed method declaration for Method. The method 2709/// declaration is now considered finished. There may be a separate 2710/// ActOnStartOfFunctionDef action later (not necessarily 2711/// immediately!) for this method, if it was also defined inside the 2712/// class body. 2713void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2714 if (!MethodD) 2715 return; 2716 2717 AdjustDeclIfTemplate(MethodD); 2718 2719 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2720 2721 // Now that we have our default arguments, check the constructor 2722 // again. It could produce additional diagnostics or affect whether 2723 // the class has implicitly-declared destructors, among other 2724 // things. 2725 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2726 CheckConstructor(Constructor); 2727 2728 // Check the default arguments, which we may have added. 2729 if (!Method->isInvalidDecl()) 2730 CheckCXXDefaultArguments(Method); 2731} 2732 2733/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2734/// the well-formedness of the constructor declarator @p D with type @p 2735/// R. If there are any errors in the declarator, this routine will 2736/// emit diagnostics and set the invalid bit to true. In any case, the type 2737/// will be updated to reflect a well-formed type for the constructor and 2738/// returned. 2739QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2740 FunctionDecl::StorageClass &SC) { 2741 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2742 2743 // C++ [class.ctor]p3: 2744 // A constructor shall not be virtual (10.3) or static (9.4). A 2745 // constructor can be invoked for a const, volatile or const 2746 // volatile object. A constructor shall not be declared const, 2747 // volatile, or const volatile (9.3.2). 2748 if (isVirtual) { 2749 if (!D.isInvalidType()) 2750 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2751 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2752 << SourceRange(D.getIdentifierLoc()); 2753 D.setInvalidType(); 2754 } 2755 if (SC == FunctionDecl::Static) { 2756 if (!D.isInvalidType()) 2757 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2758 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2759 << SourceRange(D.getIdentifierLoc()); 2760 D.setInvalidType(); 2761 SC = FunctionDecl::None; 2762 } 2763 2764 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2765 if (FTI.TypeQuals != 0) { 2766 if (FTI.TypeQuals & Qualifiers::Const) 2767 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2768 << "const" << SourceRange(D.getIdentifierLoc()); 2769 if (FTI.TypeQuals & Qualifiers::Volatile) 2770 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2771 << "volatile" << SourceRange(D.getIdentifierLoc()); 2772 if (FTI.TypeQuals & Qualifiers::Restrict) 2773 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2774 << "restrict" << SourceRange(D.getIdentifierLoc()); 2775 } 2776 2777 // Rebuild the function type "R" without any type qualifiers (in 2778 // case any of the errors above fired) and with "void" as the 2779 // return type, since constructors don't have return types. We 2780 // *always* have to do this, because GetTypeForDeclarator will 2781 // put in a result type of "int" when none was specified. 2782 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2783 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2784 Proto->getNumArgs(), 2785 Proto->isVariadic(), 0, 2786 Proto->hasExceptionSpec(), 2787 Proto->hasAnyExceptionSpec(), 2788 Proto->getNumExceptions(), 2789 Proto->exception_begin(), 2790 Proto->getExtInfo()); 2791} 2792 2793/// CheckConstructor - Checks a fully-formed constructor for 2794/// well-formedness, issuing any diagnostics required. Returns true if 2795/// the constructor declarator is invalid. 2796void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2797 CXXRecordDecl *ClassDecl 2798 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2799 if (!ClassDecl) 2800 return Constructor->setInvalidDecl(); 2801 2802 // C++ [class.copy]p3: 2803 // A declaration of a constructor for a class X is ill-formed if 2804 // its first parameter is of type (optionally cv-qualified) X and 2805 // either there are no other parameters or else all other 2806 // parameters have default arguments. 2807 if (!Constructor->isInvalidDecl() && 2808 ((Constructor->getNumParams() == 1) || 2809 (Constructor->getNumParams() > 1 && 2810 Constructor->getParamDecl(1)->hasDefaultArg())) && 2811 Constructor->getTemplateSpecializationKind() 2812 != TSK_ImplicitInstantiation) { 2813 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2814 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2815 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2816 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2817 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2818 << FixItHint::CreateInsertion(ParamLoc, " const &"); 2819 2820 // FIXME: Rather that making the constructor invalid, we should endeavor 2821 // to fix the type. 2822 Constructor->setInvalidDecl(); 2823 } 2824 } 2825 2826 // Notify the class that we've added a constructor. In principle we 2827 // don't need to do this for out-of-line declarations; in practice 2828 // we only instantiate the most recent declaration of a method, so 2829 // we have to call this for everything but friends. 2830 if (!Constructor->getFriendObjectKind()) 2831 ClassDecl->addedConstructor(Context, Constructor); 2832} 2833 2834/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2835/// issuing any diagnostics required. Returns true on error. 2836bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2837 CXXRecordDecl *RD = Destructor->getParent(); 2838 2839 if (Destructor->isVirtual()) { 2840 SourceLocation Loc; 2841 2842 if (!Destructor->isImplicit()) 2843 Loc = Destructor->getLocation(); 2844 else 2845 Loc = RD->getLocation(); 2846 2847 // If we have a virtual destructor, look up the deallocation function 2848 FunctionDecl *OperatorDelete = 0; 2849 DeclarationName Name = 2850 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2851 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2852 return true; 2853 2854 Destructor->setOperatorDelete(OperatorDelete); 2855 } 2856 2857 return false; 2858} 2859 2860static inline bool 2861FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2862 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2863 FTI.ArgInfo[0].Param && 2864 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2865} 2866 2867/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2868/// the well-formednes of the destructor declarator @p D with type @p 2869/// R. If there are any errors in the declarator, this routine will 2870/// emit diagnostics and set the declarator to invalid. Even if this happens, 2871/// will be updated to reflect a well-formed type for the destructor and 2872/// returned. 2873QualType Sema::CheckDestructorDeclarator(Declarator &D, 2874 FunctionDecl::StorageClass& SC) { 2875 // C++ [class.dtor]p1: 2876 // [...] A typedef-name that names a class is a class-name 2877 // (7.1.3); however, a typedef-name that names a class shall not 2878 // be used as the identifier in the declarator for a destructor 2879 // declaration. 2880 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2881 if (isa<TypedefType>(DeclaratorType)) { 2882 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2883 << DeclaratorType; 2884 D.setInvalidType(); 2885 } 2886 2887 // C++ [class.dtor]p2: 2888 // A destructor is used to destroy objects of its class type. A 2889 // destructor takes no parameters, and no return type can be 2890 // specified for it (not even void). The address of a destructor 2891 // shall not be taken. A destructor shall not be static. A 2892 // destructor can be invoked for a const, volatile or const 2893 // volatile object. A destructor shall not be declared const, 2894 // volatile or const volatile (9.3.2). 2895 if (SC == FunctionDecl::Static) { 2896 if (!D.isInvalidType()) 2897 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2898 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2899 << SourceRange(D.getIdentifierLoc()); 2900 SC = FunctionDecl::None; 2901 D.setInvalidType(); 2902 } 2903 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2904 // Destructors don't have return types, but the parser will 2905 // happily parse something like: 2906 // 2907 // class X { 2908 // float ~X(); 2909 // }; 2910 // 2911 // The return type will be eliminated later. 2912 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2913 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2914 << SourceRange(D.getIdentifierLoc()); 2915 } 2916 2917 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2918 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2919 if (FTI.TypeQuals & Qualifiers::Const) 2920 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2921 << "const" << SourceRange(D.getIdentifierLoc()); 2922 if (FTI.TypeQuals & Qualifiers::Volatile) 2923 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2924 << "volatile" << SourceRange(D.getIdentifierLoc()); 2925 if (FTI.TypeQuals & Qualifiers::Restrict) 2926 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2927 << "restrict" << SourceRange(D.getIdentifierLoc()); 2928 D.setInvalidType(); 2929 } 2930 2931 // Make sure we don't have any parameters. 2932 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2933 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2934 2935 // Delete the parameters. 2936 FTI.freeArgs(); 2937 D.setInvalidType(); 2938 } 2939 2940 // Make sure the destructor isn't variadic. 2941 if (FTI.isVariadic) { 2942 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2943 D.setInvalidType(); 2944 } 2945 2946 // Rebuild the function type "R" without any type qualifiers or 2947 // parameters (in case any of the errors above fired) and with 2948 // "void" as the return type, since destructors don't have return 2949 // types. We *always* have to do this, because GetTypeForDeclarator 2950 // will put in a result type of "int" when none was specified. 2951 // FIXME: Exceptions! 2952 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 2953 false, false, 0, 0, FunctionType::ExtInfo()); 2954} 2955 2956/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2957/// well-formednes of the conversion function declarator @p D with 2958/// type @p R. If there are any errors in the declarator, this routine 2959/// will emit diagnostics and return true. Otherwise, it will return 2960/// false. Either way, the type @p R will be updated to reflect a 2961/// well-formed type for the conversion operator. 2962void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2963 FunctionDecl::StorageClass& SC) { 2964 // C++ [class.conv.fct]p1: 2965 // Neither parameter types nor return type can be specified. The 2966 // type of a conversion function (8.3.5) is "function taking no 2967 // parameter returning conversion-type-id." 2968 if (SC == FunctionDecl::Static) { 2969 if (!D.isInvalidType()) 2970 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2971 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2972 << SourceRange(D.getIdentifierLoc()); 2973 D.setInvalidType(); 2974 SC = FunctionDecl::None; 2975 } 2976 2977 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2978 2979 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2980 // Conversion functions don't have return types, but the parser will 2981 // happily parse something like: 2982 // 2983 // class X { 2984 // float operator bool(); 2985 // }; 2986 // 2987 // The return type will be changed later anyway. 2988 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2989 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2990 << SourceRange(D.getIdentifierLoc()); 2991 D.setInvalidType(); 2992 } 2993 2994 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2995 2996 // Make sure we don't have any parameters. 2997 if (Proto->getNumArgs() > 0) { 2998 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2999 3000 // Delete the parameters. 3001 D.getTypeObject(0).Fun.freeArgs(); 3002 D.setInvalidType(); 3003 } else if (Proto->isVariadic()) { 3004 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3005 D.setInvalidType(); 3006 } 3007 3008 // Diagnose "&operator bool()" and other such nonsense. This 3009 // is actually a gcc extension which we don't support. 3010 if (Proto->getResultType() != ConvType) { 3011 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3012 << Proto->getResultType(); 3013 D.setInvalidType(); 3014 ConvType = Proto->getResultType(); 3015 } 3016 3017 // C++ [class.conv.fct]p4: 3018 // The conversion-type-id shall not represent a function type nor 3019 // an array type. 3020 if (ConvType->isArrayType()) { 3021 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3022 ConvType = Context.getPointerType(ConvType); 3023 D.setInvalidType(); 3024 } else if (ConvType->isFunctionType()) { 3025 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3026 ConvType = Context.getPointerType(ConvType); 3027 D.setInvalidType(); 3028 } 3029 3030 // Rebuild the function type "R" without any parameters (in case any 3031 // of the errors above fired) and with the conversion type as the 3032 // return type. 3033 if (D.isInvalidType()) { 3034 R = Context.getFunctionType(ConvType, 0, 0, false, 3035 Proto->getTypeQuals(), 3036 Proto->hasExceptionSpec(), 3037 Proto->hasAnyExceptionSpec(), 3038 Proto->getNumExceptions(), 3039 Proto->exception_begin(), 3040 Proto->getExtInfo()); 3041 } 3042 3043 // C++0x explicit conversion operators. 3044 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3045 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3046 diag::warn_explicit_conversion_functions) 3047 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3048} 3049 3050/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3051/// the declaration of the given C++ conversion function. This routine 3052/// is responsible for recording the conversion function in the C++ 3053/// class, if possible. 3054Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3055 assert(Conversion && "Expected to receive a conversion function declaration"); 3056 3057 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3058 3059 // Make sure we aren't redeclaring the conversion function. 3060 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3061 3062 // C++ [class.conv.fct]p1: 3063 // [...] A conversion function is never used to convert a 3064 // (possibly cv-qualified) object to the (possibly cv-qualified) 3065 // same object type (or a reference to it), to a (possibly 3066 // cv-qualified) base class of that type (or a reference to it), 3067 // or to (possibly cv-qualified) void. 3068 // FIXME: Suppress this warning if the conversion function ends up being a 3069 // virtual function that overrides a virtual function in a base class. 3070 QualType ClassType 3071 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3072 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3073 ConvType = ConvTypeRef->getPointeeType(); 3074 if (ConvType->isRecordType()) { 3075 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3076 if (ConvType == ClassType) 3077 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3078 << ClassType; 3079 else if (IsDerivedFrom(ClassType, ConvType)) 3080 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3081 << ClassType << ConvType; 3082 } else if (ConvType->isVoidType()) { 3083 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3084 << ClassType << ConvType; 3085 } 3086 3087 if (Conversion->getPrimaryTemplate()) { 3088 // ignore specializations 3089 } else if (Conversion->getPreviousDeclaration()) { 3090 if (FunctionTemplateDecl *ConversionTemplate 3091 = Conversion->getDescribedFunctionTemplate()) { 3092 if (ClassDecl->replaceConversion( 3093 ConversionTemplate->getPreviousDeclaration(), 3094 ConversionTemplate)) 3095 return DeclPtrTy::make(ConversionTemplate); 3096 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3097 Conversion)) 3098 return DeclPtrTy::make(Conversion); 3099 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3100 } else if (FunctionTemplateDecl *ConversionTemplate 3101 = Conversion->getDescribedFunctionTemplate()) 3102 ClassDecl->addConversionFunction(ConversionTemplate); 3103 else 3104 ClassDecl->addConversionFunction(Conversion); 3105 3106 return DeclPtrTy::make(Conversion); 3107} 3108 3109//===----------------------------------------------------------------------===// 3110// Namespace Handling 3111//===----------------------------------------------------------------------===// 3112 3113/// ActOnStartNamespaceDef - This is called at the start of a namespace 3114/// definition. 3115Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3116 SourceLocation IdentLoc, 3117 IdentifierInfo *II, 3118 SourceLocation LBrace, 3119 AttributeList *AttrList) { 3120 NamespaceDecl *Namespc = 3121 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3122 Namespc->setLBracLoc(LBrace); 3123 3124 Scope *DeclRegionScope = NamespcScope->getParent(); 3125 3126 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3127 3128 if (II) { 3129 // C++ [namespace.def]p2: 3130 // The identifier in an original-namespace-definition shall not have been 3131 // previously defined in the declarative region in which the 3132 // original-namespace-definition appears. The identifier in an 3133 // original-namespace-definition is the name of the namespace. Subsequently 3134 // in that declarative region, it is treated as an original-namespace-name. 3135 3136 NamedDecl *PrevDecl 3137 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3138 ForRedeclaration); 3139 3140 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3141 // This is an extended namespace definition. 3142 // Attach this namespace decl to the chain of extended namespace 3143 // definitions. 3144 OrigNS->setNextNamespace(Namespc); 3145 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3146 3147 // Remove the previous declaration from the scope. 3148 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3149 IdResolver.RemoveDecl(OrigNS); 3150 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3151 } 3152 } else if (PrevDecl) { 3153 // This is an invalid name redefinition. 3154 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3155 << Namespc->getDeclName(); 3156 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3157 Namespc->setInvalidDecl(); 3158 // Continue on to push Namespc as current DeclContext and return it. 3159 } else if (II->isStr("std") && 3160 CurContext->getLookupContext()->isTranslationUnit()) { 3161 // This is the first "real" definition of the namespace "std", so update 3162 // our cache of the "std" namespace to point at this definition. 3163 if (StdNamespace) { 3164 // We had already defined a dummy namespace "std". Link this new 3165 // namespace definition to the dummy namespace "std". 3166 StdNamespace->setNextNamespace(Namespc); 3167 StdNamespace->setLocation(IdentLoc); 3168 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 3169 } 3170 3171 // Make our StdNamespace cache point at the first real definition of the 3172 // "std" namespace. 3173 StdNamespace = Namespc; 3174 } 3175 3176 PushOnScopeChains(Namespc, DeclRegionScope); 3177 } else { 3178 // Anonymous namespaces. 3179 assert(Namespc->isAnonymousNamespace()); 3180 3181 // Link the anonymous namespace into its parent. 3182 NamespaceDecl *PrevDecl; 3183 DeclContext *Parent = CurContext->getLookupContext(); 3184 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3185 PrevDecl = TU->getAnonymousNamespace(); 3186 TU->setAnonymousNamespace(Namespc); 3187 } else { 3188 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3189 PrevDecl = ND->getAnonymousNamespace(); 3190 ND->setAnonymousNamespace(Namespc); 3191 } 3192 3193 // Link the anonymous namespace with its previous declaration. 3194 if (PrevDecl) { 3195 assert(PrevDecl->isAnonymousNamespace()); 3196 assert(!PrevDecl->getNextNamespace()); 3197 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3198 PrevDecl->setNextNamespace(Namespc); 3199 } 3200 3201 CurContext->addDecl(Namespc); 3202 3203 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3204 // behaves as if it were replaced by 3205 // namespace unique { /* empty body */ } 3206 // using namespace unique; 3207 // namespace unique { namespace-body } 3208 // where all occurrences of 'unique' in a translation unit are 3209 // replaced by the same identifier and this identifier differs 3210 // from all other identifiers in the entire program. 3211 3212 // We just create the namespace with an empty name and then add an 3213 // implicit using declaration, just like the standard suggests. 3214 // 3215 // CodeGen enforces the "universally unique" aspect by giving all 3216 // declarations semantically contained within an anonymous 3217 // namespace internal linkage. 3218 3219 if (!PrevDecl) { 3220 UsingDirectiveDecl* UD 3221 = UsingDirectiveDecl::Create(Context, CurContext, 3222 /* 'using' */ LBrace, 3223 /* 'namespace' */ SourceLocation(), 3224 /* qualifier */ SourceRange(), 3225 /* NNS */ NULL, 3226 /* identifier */ SourceLocation(), 3227 Namespc, 3228 /* Ancestor */ CurContext); 3229 UD->setImplicit(); 3230 CurContext->addDecl(UD); 3231 } 3232 } 3233 3234 // Although we could have an invalid decl (i.e. the namespace name is a 3235 // redefinition), push it as current DeclContext and try to continue parsing. 3236 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3237 // for the namespace has the declarations that showed up in that particular 3238 // namespace definition. 3239 PushDeclContext(NamespcScope, Namespc); 3240 return DeclPtrTy::make(Namespc); 3241} 3242 3243/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3244/// is a namespace alias, returns the namespace it points to. 3245static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3246 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3247 return AD->getNamespace(); 3248 return dyn_cast_or_null<NamespaceDecl>(D); 3249} 3250 3251/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3252/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3253void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3254 Decl *Dcl = D.getAs<Decl>(); 3255 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3256 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3257 Namespc->setRBracLoc(RBrace); 3258 PopDeclContext(); 3259} 3260 3261Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3262 SourceLocation UsingLoc, 3263 SourceLocation NamespcLoc, 3264 CXXScopeSpec &SS, 3265 SourceLocation IdentLoc, 3266 IdentifierInfo *NamespcName, 3267 AttributeList *AttrList) { 3268 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3269 assert(NamespcName && "Invalid NamespcName."); 3270 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3271 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3272 3273 UsingDirectiveDecl *UDir = 0; 3274 3275 // Lookup namespace name. 3276 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3277 LookupParsedName(R, S, &SS); 3278 if (R.isAmbiguous()) 3279 return DeclPtrTy(); 3280 3281 if (!R.empty()) { 3282 NamedDecl *Named = R.getFoundDecl(); 3283 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3284 && "expected namespace decl"); 3285 // C++ [namespace.udir]p1: 3286 // A using-directive specifies that the names in the nominated 3287 // namespace can be used in the scope in which the 3288 // using-directive appears after the using-directive. During 3289 // unqualified name lookup (3.4.1), the names appear as if they 3290 // were declared in the nearest enclosing namespace which 3291 // contains both the using-directive and the nominated 3292 // namespace. [Note: in this context, "contains" means "contains 3293 // directly or indirectly". ] 3294 3295 // Find enclosing context containing both using-directive and 3296 // nominated namespace. 3297 NamespaceDecl *NS = getNamespaceDecl(Named); 3298 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3299 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3300 CommonAncestor = CommonAncestor->getParent(); 3301 3302 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3303 SS.getRange(), 3304 (NestedNameSpecifier *)SS.getScopeRep(), 3305 IdentLoc, Named, CommonAncestor); 3306 PushUsingDirective(S, UDir); 3307 } else { 3308 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3309 } 3310 3311 // FIXME: We ignore attributes for now. 3312 delete AttrList; 3313 return DeclPtrTy::make(UDir); 3314} 3315 3316void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3317 // If scope has associated entity, then using directive is at namespace 3318 // or translation unit scope. We add UsingDirectiveDecls, into 3319 // it's lookup structure. 3320 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3321 Ctx->addDecl(UDir); 3322 else 3323 // Otherwise it is block-sope. using-directives will affect lookup 3324 // only to the end of scope. 3325 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3326} 3327 3328 3329Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3330 AccessSpecifier AS, 3331 bool HasUsingKeyword, 3332 SourceLocation UsingLoc, 3333 CXXScopeSpec &SS, 3334 UnqualifiedId &Name, 3335 AttributeList *AttrList, 3336 bool IsTypeName, 3337 SourceLocation TypenameLoc) { 3338 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3339 3340 switch (Name.getKind()) { 3341 case UnqualifiedId::IK_Identifier: 3342 case UnqualifiedId::IK_OperatorFunctionId: 3343 case UnqualifiedId::IK_LiteralOperatorId: 3344 case UnqualifiedId::IK_ConversionFunctionId: 3345 break; 3346 3347 case UnqualifiedId::IK_ConstructorName: 3348 case UnqualifiedId::IK_ConstructorTemplateId: 3349 // C++0x inherited constructors. 3350 if (getLangOptions().CPlusPlus0x) break; 3351 3352 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3353 << SS.getRange(); 3354 return DeclPtrTy(); 3355 3356 case UnqualifiedId::IK_DestructorName: 3357 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3358 << SS.getRange(); 3359 return DeclPtrTy(); 3360 3361 case UnqualifiedId::IK_TemplateId: 3362 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3363 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3364 return DeclPtrTy(); 3365 } 3366 3367 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3368 if (!TargetName) 3369 return DeclPtrTy(); 3370 3371 // Warn about using declarations. 3372 // TODO: store that the declaration was written without 'using' and 3373 // talk about access decls instead of using decls in the 3374 // diagnostics. 3375 if (!HasUsingKeyword) { 3376 UsingLoc = Name.getSourceRange().getBegin(); 3377 3378 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3379 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3380 } 3381 3382 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3383 Name.getSourceRange().getBegin(), 3384 TargetName, AttrList, 3385 /* IsInstantiation */ false, 3386 IsTypeName, TypenameLoc); 3387 if (UD) 3388 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3389 3390 return DeclPtrTy::make(UD); 3391} 3392 3393/// Determines whether to create a using shadow decl for a particular 3394/// decl, given the set of decls existing prior to this using lookup. 3395bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3396 const LookupResult &Previous) { 3397 // Diagnose finding a decl which is not from a base class of the 3398 // current class. We do this now because there are cases where this 3399 // function will silently decide not to build a shadow decl, which 3400 // will pre-empt further diagnostics. 3401 // 3402 // We don't need to do this in C++0x because we do the check once on 3403 // the qualifier. 3404 // 3405 // FIXME: diagnose the following if we care enough: 3406 // struct A { int foo; }; 3407 // struct B : A { using A::foo; }; 3408 // template <class T> struct C : A {}; 3409 // template <class T> struct D : C<T> { using B::foo; } // <--- 3410 // This is invalid (during instantiation) in C++03 because B::foo 3411 // resolves to the using decl in B, which is not a base class of D<T>. 3412 // We can't diagnose it immediately because C<T> is an unknown 3413 // specialization. The UsingShadowDecl in D<T> then points directly 3414 // to A::foo, which will look well-formed when we instantiate. 3415 // The right solution is to not collapse the shadow-decl chain. 3416 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3417 DeclContext *OrigDC = Orig->getDeclContext(); 3418 3419 // Handle enums and anonymous structs. 3420 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3421 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3422 while (OrigRec->isAnonymousStructOrUnion()) 3423 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3424 3425 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3426 if (OrigDC == CurContext) { 3427 Diag(Using->getLocation(), 3428 diag::err_using_decl_nested_name_specifier_is_current_class) 3429 << Using->getNestedNameRange(); 3430 Diag(Orig->getLocation(), diag::note_using_decl_target); 3431 return true; 3432 } 3433 3434 Diag(Using->getNestedNameRange().getBegin(), 3435 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3436 << Using->getTargetNestedNameDecl() 3437 << cast<CXXRecordDecl>(CurContext) 3438 << Using->getNestedNameRange(); 3439 Diag(Orig->getLocation(), diag::note_using_decl_target); 3440 return true; 3441 } 3442 } 3443 3444 if (Previous.empty()) return false; 3445 3446 NamedDecl *Target = Orig; 3447 if (isa<UsingShadowDecl>(Target)) 3448 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3449 3450 // If the target happens to be one of the previous declarations, we 3451 // don't have a conflict. 3452 // 3453 // FIXME: but we might be increasing its access, in which case we 3454 // should redeclare it. 3455 NamedDecl *NonTag = 0, *Tag = 0; 3456 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3457 I != E; ++I) { 3458 NamedDecl *D = (*I)->getUnderlyingDecl(); 3459 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3460 return false; 3461 3462 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3463 } 3464 3465 if (Target->isFunctionOrFunctionTemplate()) { 3466 FunctionDecl *FD; 3467 if (isa<FunctionTemplateDecl>(Target)) 3468 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3469 else 3470 FD = cast<FunctionDecl>(Target); 3471 3472 NamedDecl *OldDecl = 0; 3473 switch (CheckOverload(FD, Previous, OldDecl)) { 3474 case Ovl_Overload: 3475 return false; 3476 3477 case Ovl_NonFunction: 3478 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3479 break; 3480 3481 // We found a decl with the exact signature. 3482 case Ovl_Match: 3483 if (isa<UsingShadowDecl>(OldDecl)) { 3484 // Silently ignore the possible conflict. 3485 return false; 3486 } 3487 3488 // If we're in a record, we want to hide the target, so we 3489 // return true (without a diagnostic) to tell the caller not to 3490 // build a shadow decl. 3491 if (CurContext->isRecord()) 3492 return true; 3493 3494 // If we're not in a record, this is an error. 3495 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3496 break; 3497 } 3498 3499 Diag(Target->getLocation(), diag::note_using_decl_target); 3500 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3501 return true; 3502 } 3503 3504 // Target is not a function. 3505 3506 if (isa<TagDecl>(Target)) { 3507 // No conflict between a tag and a non-tag. 3508 if (!Tag) return false; 3509 3510 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3511 Diag(Target->getLocation(), diag::note_using_decl_target); 3512 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3513 return true; 3514 } 3515 3516 // No conflict between a tag and a non-tag. 3517 if (!NonTag) return false; 3518 3519 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3520 Diag(Target->getLocation(), diag::note_using_decl_target); 3521 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3522 return true; 3523} 3524 3525/// Builds a shadow declaration corresponding to a 'using' declaration. 3526UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3527 UsingDecl *UD, 3528 NamedDecl *Orig) { 3529 3530 // If we resolved to another shadow declaration, just coalesce them. 3531 NamedDecl *Target = Orig; 3532 if (isa<UsingShadowDecl>(Target)) { 3533 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3534 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3535 } 3536 3537 UsingShadowDecl *Shadow 3538 = UsingShadowDecl::Create(Context, CurContext, 3539 UD->getLocation(), UD, Target); 3540 UD->addShadowDecl(Shadow); 3541 3542 if (S) 3543 PushOnScopeChains(Shadow, S); 3544 else 3545 CurContext->addDecl(Shadow); 3546 Shadow->setAccess(UD->getAccess()); 3547 3548 // Register it as a conversion if appropriate. 3549 if (Shadow->getDeclName().getNameKind() 3550 == DeclarationName::CXXConversionFunctionName) 3551 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3552 3553 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3554 Shadow->setInvalidDecl(); 3555 3556 return Shadow; 3557} 3558 3559/// Hides a using shadow declaration. This is required by the current 3560/// using-decl implementation when a resolvable using declaration in a 3561/// class is followed by a declaration which would hide or override 3562/// one or more of the using decl's targets; for example: 3563/// 3564/// struct Base { void foo(int); }; 3565/// struct Derived : Base { 3566/// using Base::foo; 3567/// void foo(int); 3568/// }; 3569/// 3570/// The governing language is C++03 [namespace.udecl]p12: 3571/// 3572/// When a using-declaration brings names from a base class into a 3573/// derived class scope, member functions in the derived class 3574/// override and/or hide member functions with the same name and 3575/// parameter types in a base class (rather than conflicting). 3576/// 3577/// There are two ways to implement this: 3578/// (1) optimistically create shadow decls when they're not hidden 3579/// by existing declarations, or 3580/// (2) don't create any shadow decls (or at least don't make them 3581/// visible) until we've fully parsed/instantiated the class. 3582/// The problem with (1) is that we might have to retroactively remove 3583/// a shadow decl, which requires several O(n) operations because the 3584/// decl structures are (very reasonably) not designed for removal. 3585/// (2) avoids this but is very fiddly and phase-dependent. 3586void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3587 if (Shadow->getDeclName().getNameKind() == 3588 DeclarationName::CXXConversionFunctionName) 3589 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3590 3591 // Remove it from the DeclContext... 3592 Shadow->getDeclContext()->removeDecl(Shadow); 3593 3594 // ...and the scope, if applicable... 3595 if (S) { 3596 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3597 IdResolver.RemoveDecl(Shadow); 3598 } 3599 3600 // ...and the using decl. 3601 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3602 3603 // TODO: complain somehow if Shadow was used. It shouldn't 3604 // be possible for this to happen, because...? 3605} 3606 3607/// Builds a using declaration. 3608/// 3609/// \param IsInstantiation - Whether this call arises from an 3610/// instantiation of an unresolved using declaration. We treat 3611/// the lookup differently for these declarations. 3612NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3613 SourceLocation UsingLoc, 3614 CXXScopeSpec &SS, 3615 SourceLocation IdentLoc, 3616 DeclarationName Name, 3617 AttributeList *AttrList, 3618 bool IsInstantiation, 3619 bool IsTypeName, 3620 SourceLocation TypenameLoc) { 3621 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3622 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3623 3624 // FIXME: We ignore attributes for now. 3625 delete AttrList; 3626 3627 if (SS.isEmpty()) { 3628 Diag(IdentLoc, diag::err_using_requires_qualname); 3629 return 0; 3630 } 3631 3632 // Do the redeclaration lookup in the current scope. 3633 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3634 ForRedeclaration); 3635 Previous.setHideTags(false); 3636 if (S) { 3637 LookupName(Previous, S); 3638 3639 // It is really dumb that we have to do this. 3640 LookupResult::Filter F = Previous.makeFilter(); 3641 while (F.hasNext()) { 3642 NamedDecl *D = F.next(); 3643 if (!isDeclInScope(D, CurContext, S)) 3644 F.erase(); 3645 } 3646 F.done(); 3647 } else { 3648 assert(IsInstantiation && "no scope in non-instantiation"); 3649 assert(CurContext->isRecord() && "scope not record in instantiation"); 3650 LookupQualifiedName(Previous, CurContext); 3651 } 3652 3653 NestedNameSpecifier *NNS = 3654 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3655 3656 // Check for invalid redeclarations. 3657 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3658 return 0; 3659 3660 // Check for bad qualifiers. 3661 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3662 return 0; 3663 3664 DeclContext *LookupContext = computeDeclContext(SS); 3665 NamedDecl *D; 3666 if (!LookupContext) { 3667 if (IsTypeName) { 3668 // FIXME: not all declaration name kinds are legal here 3669 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3670 UsingLoc, TypenameLoc, 3671 SS.getRange(), NNS, 3672 IdentLoc, Name); 3673 } else { 3674 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3675 UsingLoc, SS.getRange(), NNS, 3676 IdentLoc, Name); 3677 } 3678 } else { 3679 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3680 SS.getRange(), UsingLoc, NNS, Name, 3681 IsTypeName); 3682 } 3683 D->setAccess(AS); 3684 CurContext->addDecl(D); 3685 3686 if (!LookupContext) return D; 3687 UsingDecl *UD = cast<UsingDecl>(D); 3688 3689 if (RequireCompleteDeclContext(SS)) { 3690 UD->setInvalidDecl(); 3691 return UD; 3692 } 3693 3694 // Look up the target name. 3695 3696 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3697 3698 // Unlike most lookups, we don't always want to hide tag 3699 // declarations: tag names are visible through the using declaration 3700 // even if hidden by ordinary names, *except* in a dependent context 3701 // where it's important for the sanity of two-phase lookup. 3702 if (!IsInstantiation) 3703 R.setHideTags(false); 3704 3705 LookupQualifiedName(R, LookupContext); 3706 3707 if (R.empty()) { 3708 Diag(IdentLoc, diag::err_no_member) 3709 << Name << LookupContext << SS.getRange(); 3710 UD->setInvalidDecl(); 3711 return UD; 3712 } 3713 3714 if (R.isAmbiguous()) { 3715 UD->setInvalidDecl(); 3716 return UD; 3717 } 3718 3719 if (IsTypeName) { 3720 // If we asked for a typename and got a non-type decl, error out. 3721 if (!R.getAsSingle<TypeDecl>()) { 3722 Diag(IdentLoc, diag::err_using_typename_non_type); 3723 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3724 Diag((*I)->getUnderlyingDecl()->getLocation(), 3725 diag::note_using_decl_target); 3726 UD->setInvalidDecl(); 3727 return UD; 3728 } 3729 } else { 3730 // If we asked for a non-typename and we got a type, error out, 3731 // but only if this is an instantiation of an unresolved using 3732 // decl. Otherwise just silently find the type name. 3733 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3734 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3735 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3736 UD->setInvalidDecl(); 3737 return UD; 3738 } 3739 } 3740 3741 // C++0x N2914 [namespace.udecl]p6: 3742 // A using-declaration shall not name a namespace. 3743 if (R.getAsSingle<NamespaceDecl>()) { 3744 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3745 << SS.getRange(); 3746 UD->setInvalidDecl(); 3747 return UD; 3748 } 3749 3750 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3751 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3752 BuildUsingShadowDecl(S, UD, *I); 3753 } 3754 3755 return UD; 3756} 3757 3758/// Checks that the given using declaration is not an invalid 3759/// redeclaration. Note that this is checking only for the using decl 3760/// itself, not for any ill-formedness among the UsingShadowDecls. 3761bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3762 bool isTypeName, 3763 const CXXScopeSpec &SS, 3764 SourceLocation NameLoc, 3765 const LookupResult &Prev) { 3766 // C++03 [namespace.udecl]p8: 3767 // C++0x [namespace.udecl]p10: 3768 // A using-declaration is a declaration and can therefore be used 3769 // repeatedly where (and only where) multiple declarations are 3770 // allowed. 3771 // That's only in file contexts. 3772 if (CurContext->getLookupContext()->isFileContext()) 3773 return false; 3774 3775 NestedNameSpecifier *Qual 3776 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3777 3778 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3779 NamedDecl *D = *I; 3780 3781 bool DTypename; 3782 NestedNameSpecifier *DQual; 3783 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3784 DTypename = UD->isTypeName(); 3785 DQual = UD->getTargetNestedNameDecl(); 3786 } else if (UnresolvedUsingValueDecl *UD 3787 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3788 DTypename = false; 3789 DQual = UD->getTargetNestedNameSpecifier(); 3790 } else if (UnresolvedUsingTypenameDecl *UD 3791 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3792 DTypename = true; 3793 DQual = UD->getTargetNestedNameSpecifier(); 3794 } else continue; 3795 3796 // using decls differ if one says 'typename' and the other doesn't. 3797 // FIXME: non-dependent using decls? 3798 if (isTypeName != DTypename) continue; 3799 3800 // using decls differ if they name different scopes (but note that 3801 // template instantiation can cause this check to trigger when it 3802 // didn't before instantiation). 3803 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3804 Context.getCanonicalNestedNameSpecifier(DQual)) 3805 continue; 3806 3807 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3808 Diag(D->getLocation(), diag::note_using_decl) << 1; 3809 return true; 3810 } 3811 3812 return false; 3813} 3814 3815 3816/// Checks that the given nested-name qualifier used in a using decl 3817/// in the current context is appropriately related to the current 3818/// scope. If an error is found, diagnoses it and returns true. 3819bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3820 const CXXScopeSpec &SS, 3821 SourceLocation NameLoc) { 3822 DeclContext *NamedContext = computeDeclContext(SS); 3823 3824 if (!CurContext->isRecord()) { 3825 // C++03 [namespace.udecl]p3: 3826 // C++0x [namespace.udecl]p8: 3827 // A using-declaration for a class member shall be a member-declaration. 3828 3829 // If we weren't able to compute a valid scope, it must be a 3830 // dependent class scope. 3831 if (!NamedContext || NamedContext->isRecord()) { 3832 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3833 << SS.getRange(); 3834 return true; 3835 } 3836 3837 // Otherwise, everything is known to be fine. 3838 return false; 3839 } 3840 3841 // The current scope is a record. 3842 3843 // If the named context is dependent, we can't decide much. 3844 if (!NamedContext) { 3845 // FIXME: in C++0x, we can diagnose if we can prove that the 3846 // nested-name-specifier does not refer to a base class, which is 3847 // still possible in some cases. 3848 3849 // Otherwise we have to conservatively report that things might be 3850 // okay. 3851 return false; 3852 } 3853 3854 if (!NamedContext->isRecord()) { 3855 // Ideally this would point at the last name in the specifier, 3856 // but we don't have that level of source info. 3857 Diag(SS.getRange().getBegin(), 3858 diag::err_using_decl_nested_name_specifier_is_not_class) 3859 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3860 return true; 3861 } 3862 3863 if (getLangOptions().CPlusPlus0x) { 3864 // C++0x [namespace.udecl]p3: 3865 // In a using-declaration used as a member-declaration, the 3866 // nested-name-specifier shall name a base class of the class 3867 // being defined. 3868 3869 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3870 cast<CXXRecordDecl>(NamedContext))) { 3871 if (CurContext == NamedContext) { 3872 Diag(NameLoc, 3873 diag::err_using_decl_nested_name_specifier_is_current_class) 3874 << SS.getRange(); 3875 return true; 3876 } 3877 3878 Diag(SS.getRange().getBegin(), 3879 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3880 << (NestedNameSpecifier*) SS.getScopeRep() 3881 << cast<CXXRecordDecl>(CurContext) 3882 << SS.getRange(); 3883 return true; 3884 } 3885 3886 return false; 3887 } 3888 3889 // C++03 [namespace.udecl]p4: 3890 // A using-declaration used as a member-declaration shall refer 3891 // to a member of a base class of the class being defined [etc.]. 3892 3893 // Salient point: SS doesn't have to name a base class as long as 3894 // lookup only finds members from base classes. Therefore we can 3895 // diagnose here only if we can prove that that can't happen, 3896 // i.e. if the class hierarchies provably don't intersect. 3897 3898 // TODO: it would be nice if "definitely valid" results were cached 3899 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3900 // need to be repeated. 3901 3902 struct UserData { 3903 llvm::DenseSet<const CXXRecordDecl*> Bases; 3904 3905 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3906 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3907 Data->Bases.insert(Base); 3908 return true; 3909 } 3910 3911 bool hasDependentBases(const CXXRecordDecl *Class) { 3912 return !Class->forallBases(collect, this); 3913 } 3914 3915 /// Returns true if the base is dependent or is one of the 3916 /// accumulated base classes. 3917 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3918 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3919 return !Data->Bases.count(Base); 3920 } 3921 3922 bool mightShareBases(const CXXRecordDecl *Class) { 3923 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3924 } 3925 }; 3926 3927 UserData Data; 3928 3929 // Returns false if we find a dependent base. 3930 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3931 return false; 3932 3933 // Returns false if the class has a dependent base or if it or one 3934 // of its bases is present in the base set of the current context. 3935 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3936 return false; 3937 3938 Diag(SS.getRange().getBegin(), 3939 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3940 << (NestedNameSpecifier*) SS.getScopeRep() 3941 << cast<CXXRecordDecl>(CurContext) 3942 << SS.getRange(); 3943 3944 return true; 3945} 3946 3947Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3948 SourceLocation NamespaceLoc, 3949 SourceLocation AliasLoc, 3950 IdentifierInfo *Alias, 3951 CXXScopeSpec &SS, 3952 SourceLocation IdentLoc, 3953 IdentifierInfo *Ident) { 3954 3955 // Lookup the namespace name. 3956 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3957 LookupParsedName(R, S, &SS); 3958 3959 // Check if we have a previous declaration with the same name. 3960 if (NamedDecl *PrevDecl 3961 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 3962 ForRedeclaration)) { 3963 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3964 // We already have an alias with the same name that points to the same 3965 // namespace, so don't create a new one. 3966 // FIXME: At some point, we'll want to create the (redundant) 3967 // declaration to maintain better source information. 3968 if (!R.isAmbiguous() && !R.empty() && 3969 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 3970 return DeclPtrTy(); 3971 } 3972 3973 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3974 diag::err_redefinition_different_kind; 3975 Diag(AliasLoc, DiagID) << Alias; 3976 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3977 return DeclPtrTy(); 3978 } 3979 3980 if (R.isAmbiguous()) 3981 return DeclPtrTy(); 3982 3983 if (R.empty()) { 3984 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3985 return DeclPtrTy(); 3986 } 3987 3988 NamespaceAliasDecl *AliasDecl = 3989 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3990 Alias, SS.getRange(), 3991 (NestedNameSpecifier *)SS.getScopeRep(), 3992 IdentLoc, R.getFoundDecl()); 3993 3994 PushOnScopeChains(AliasDecl, S); 3995 return DeclPtrTy::make(AliasDecl); 3996} 3997 3998void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3999 CXXConstructorDecl *Constructor) { 4000 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4001 !Constructor->isUsed()) && 4002 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4003 4004 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4005 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4006 4007 DeclContext *PreviousContext = CurContext; 4008 CurContext = Constructor; 4009 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false)) { 4010 Diag(CurrentLocation, diag::note_member_synthesized_at) 4011 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4012 Constructor->setInvalidDecl(); 4013 } else { 4014 Constructor->setUsed(); 4015 } 4016 CurContext = PreviousContext; 4017} 4018 4019void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4020 CXXDestructorDecl *Destructor) { 4021 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 4022 "DefineImplicitDestructor - call it for implicit default dtor"); 4023 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4024 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4025 4026 DeclContext *PreviousContext = CurContext; 4027 CurContext = Destructor; 4028 4029 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4030 Destructor->getParent()); 4031 4032 // FIXME: If CheckDestructor fails, we should emit a note about where the 4033 // implicit destructor was needed. 4034 if (CheckDestructor(Destructor)) { 4035 Diag(CurrentLocation, diag::note_member_synthesized_at) 4036 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4037 4038 Destructor->setInvalidDecl(); 4039 CurContext = PreviousContext; 4040 4041 return; 4042 } 4043 CurContext = PreviousContext; 4044 4045 Destructor->setUsed(); 4046} 4047 4048void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 4049 CXXMethodDecl *MethodDecl) { 4050 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 4051 MethodDecl->getOverloadedOperator() == OO_Equal && 4052 !MethodDecl->isUsed()) && 4053 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 4054 4055 CXXRecordDecl *ClassDecl 4056 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 4057 4058 DeclContext *PreviousContext = CurContext; 4059 CurContext = MethodDecl; 4060 4061 // C++[class.copy] p12 4062 // Before the implicitly-declared copy assignment operator for a class is 4063 // implicitly defined, all implicitly-declared copy assignment operators 4064 // for its direct base classes and its nonstatic data members shall have 4065 // been implicitly defined. 4066 bool err = false; 4067 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4068 E = ClassDecl->bases_end(); Base != E; ++Base) { 4069 CXXRecordDecl *BaseClassDecl 4070 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4071 if (CXXMethodDecl *BaseAssignOpMethod = 4072 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 4073 BaseClassDecl)) { 4074 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 4075 BaseAssignOpMethod, 4076 PDiag(diag::err_access_assign_base) 4077 << Base->getType()); 4078 4079 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 4080 } 4081 } 4082 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4083 E = ClassDecl->field_end(); Field != E; ++Field) { 4084 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 4085 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 4086 FieldType = Array->getElementType(); 4087 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4088 CXXRecordDecl *FieldClassDecl 4089 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4090 if (CXXMethodDecl *FieldAssignOpMethod = 4091 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 4092 FieldClassDecl)) { 4093 CheckDirectMemberAccess(Field->getLocation(), 4094 FieldAssignOpMethod, 4095 PDiag(diag::err_access_assign_field) 4096 << Field->getDeclName() << Field->getType()); 4097 4098 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 4099 } 4100 } else if (FieldType->isReferenceType()) { 4101 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4102 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4103 Diag(Field->getLocation(), diag::note_declared_at); 4104 Diag(CurrentLocation, diag::note_first_required_here); 4105 err = true; 4106 } else if (FieldType.isConstQualified()) { 4107 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4108 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4109 Diag(Field->getLocation(), diag::note_declared_at); 4110 Diag(CurrentLocation, diag::note_first_required_here); 4111 err = true; 4112 } 4113 } 4114 if (!err) 4115 MethodDecl->setUsed(); 4116 4117 CurContext = PreviousContext; 4118} 4119 4120CXXMethodDecl * 4121Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 4122 ParmVarDecl *ParmDecl, 4123 CXXRecordDecl *ClassDecl) { 4124 QualType LHSType = Context.getTypeDeclType(ClassDecl); 4125 QualType RHSType(LHSType); 4126 // If class's assignment operator argument is const/volatile qualified, 4127 // look for operator = (const/volatile B&). Otherwise, look for 4128 // operator = (B&). 4129 RHSType = Context.getCVRQualifiedType(RHSType, 4130 ParmDecl->getType().getCVRQualifiers()); 4131 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 4132 LHSType, 4133 SourceLocation())); 4134 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 4135 RHSType, 4136 CurrentLocation)); 4137 Expr *Args[2] = { &*LHS, &*RHS }; 4138 OverloadCandidateSet CandidateSet(CurrentLocation); 4139 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 4140 CandidateSet); 4141 OverloadCandidateSet::iterator Best; 4142 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 4143 return cast<CXXMethodDecl>(Best->Function); 4144 assert(false && 4145 "getAssignOperatorMethod - copy assignment operator method not found"); 4146 return 0; 4147} 4148 4149void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 4150 CXXConstructorDecl *CopyConstructor, 4151 unsigned TypeQuals) { 4152 assert((CopyConstructor->isImplicit() && 4153 CopyConstructor->isCopyConstructor(TypeQuals) && 4154 !CopyConstructor->isUsed()) && 4155 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 4156 4157 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 4158 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 4159 4160 DeclContext *PreviousContext = CurContext; 4161 CurContext = CopyConstructor; 4162 4163 // C++ [class.copy] p209 4164 // Before the implicitly-declared copy constructor for a class is 4165 // implicitly defined, all the implicitly-declared copy constructors 4166 // for its base class and its non-static data members shall have been 4167 // implicitly defined. 4168 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 4169 Base != ClassDecl->bases_end(); ++Base) { 4170 CXXRecordDecl *BaseClassDecl 4171 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4172 if (CXXConstructorDecl *BaseCopyCtor = 4173 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) { 4174 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 4175 BaseCopyCtor, 4176 PDiag(diag::err_access_copy_base) 4177 << Base->getType()); 4178 4179 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 4180 } 4181 } 4182 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4183 FieldEnd = ClassDecl->field_end(); 4184 Field != FieldEnd; ++Field) { 4185 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 4186 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 4187 FieldType = Array->getElementType(); 4188 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4189 CXXRecordDecl *FieldClassDecl 4190 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4191 if (CXXConstructorDecl *FieldCopyCtor = 4192 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) { 4193 CheckDirectMemberAccess(Field->getLocation(), 4194 FieldCopyCtor, 4195 PDiag(diag::err_access_copy_field) 4196 << Field->getDeclName() << Field->getType()); 4197 4198 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 4199 } 4200 } 4201 } 4202 CopyConstructor->setUsed(); 4203 4204 CurContext = PreviousContext; 4205} 4206 4207Sema::OwningExprResult 4208Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4209 CXXConstructorDecl *Constructor, 4210 MultiExprArg ExprArgs, 4211 bool RequiresZeroInit, 4212 bool BaseInitialization) { 4213 bool Elidable = false; 4214 4215 // C++0x [class.copy]p34: 4216 // When certain criteria are met, an implementation is allowed to 4217 // omit the copy/move construction of a class object, even if the 4218 // copy/move constructor and/or destructor for the object have 4219 // side effects. [...] 4220 // - when a temporary class object that has not been bound to a 4221 // reference (12.2) would be copied/moved to a class object 4222 // with the same cv-unqualified type, the copy/move operation 4223 // can be omitted by constructing the temporary object 4224 // directly into the target of the omitted copy/move 4225 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 4226 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 4227 Elidable = SubExpr->isTemporaryObject() && 4228 Context.hasSameUnqualifiedType(SubExpr->getType(), 4229 Context.getTypeDeclType(Constructor->getParent())); 4230 } 4231 4232 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4233 Elidable, move(ExprArgs), RequiresZeroInit, 4234 BaseInitialization); 4235} 4236 4237/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4238/// including handling of its default argument expressions. 4239Sema::OwningExprResult 4240Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4241 CXXConstructorDecl *Constructor, bool Elidable, 4242 MultiExprArg ExprArgs, 4243 bool RequiresZeroInit, 4244 bool BaseInitialization) { 4245 unsigned NumExprs = ExprArgs.size(); 4246 Expr **Exprs = (Expr **)ExprArgs.release(); 4247 4248 MarkDeclarationReferenced(ConstructLoc, Constructor); 4249 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4250 Constructor, Elidable, Exprs, NumExprs, 4251 RequiresZeroInit, BaseInitialization)); 4252} 4253 4254bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4255 CXXConstructorDecl *Constructor, 4256 MultiExprArg Exprs) { 4257 OwningExprResult TempResult = 4258 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4259 move(Exprs)); 4260 if (TempResult.isInvalid()) 4261 return true; 4262 4263 Expr *Temp = TempResult.takeAs<Expr>(); 4264 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4265 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4266 VD->setInit(Temp); 4267 4268 return false; 4269} 4270 4271void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4272 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4273 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4274 !ClassDecl->hasTrivialDestructor()) { 4275 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4276 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4277 CheckDestructorAccess(VD->getLocation(), Destructor, 4278 PDiag(diag::err_access_dtor_var) 4279 << VD->getDeclName() 4280 << VD->getType()); 4281 } 4282} 4283 4284/// AddCXXDirectInitializerToDecl - This action is called immediately after 4285/// ActOnDeclarator, when a C++ direct initializer is present. 4286/// e.g: "int x(1);" 4287void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4288 SourceLocation LParenLoc, 4289 MultiExprArg Exprs, 4290 SourceLocation *CommaLocs, 4291 SourceLocation RParenLoc) { 4292 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4293 Decl *RealDecl = Dcl.getAs<Decl>(); 4294 4295 // If there is no declaration, there was an error parsing it. Just ignore 4296 // the initializer. 4297 if (RealDecl == 0) 4298 return; 4299 4300 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4301 if (!VDecl) { 4302 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4303 RealDecl->setInvalidDecl(); 4304 return; 4305 } 4306 4307 // We will represent direct-initialization similarly to copy-initialization: 4308 // int x(1); -as-> int x = 1; 4309 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4310 // 4311 // Clients that want to distinguish between the two forms, can check for 4312 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4313 // A major benefit is that clients that don't particularly care about which 4314 // exactly form was it (like the CodeGen) can handle both cases without 4315 // special case code. 4316 4317 // C++ 8.5p11: 4318 // The form of initialization (using parentheses or '=') is generally 4319 // insignificant, but does matter when the entity being initialized has a 4320 // class type. 4321 QualType DeclInitType = VDecl->getType(); 4322 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4323 DeclInitType = Context.getBaseElementType(Array); 4324 4325 if (!VDecl->getType()->isDependentType() && 4326 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4327 diag::err_typecheck_decl_incomplete_type)) { 4328 VDecl->setInvalidDecl(); 4329 return; 4330 } 4331 4332 // The variable can not have an abstract class type. 4333 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4334 diag::err_abstract_type_in_decl, 4335 AbstractVariableType)) 4336 VDecl->setInvalidDecl(); 4337 4338 const VarDecl *Def; 4339 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4340 Diag(VDecl->getLocation(), diag::err_redefinition) 4341 << VDecl->getDeclName(); 4342 Diag(Def->getLocation(), diag::note_previous_definition); 4343 VDecl->setInvalidDecl(); 4344 return; 4345 } 4346 4347 // If either the declaration has a dependent type or if any of the 4348 // expressions is type-dependent, we represent the initialization 4349 // via a ParenListExpr for later use during template instantiation. 4350 if (VDecl->getType()->isDependentType() || 4351 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4352 // Let clients know that initialization was done with a direct initializer. 4353 VDecl->setCXXDirectInitializer(true); 4354 4355 // Store the initialization expressions as a ParenListExpr. 4356 unsigned NumExprs = Exprs.size(); 4357 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4358 (Expr **)Exprs.release(), 4359 NumExprs, RParenLoc)); 4360 return; 4361 } 4362 4363 // Capture the variable that is being initialized and the style of 4364 // initialization. 4365 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4366 4367 // FIXME: Poor source location information. 4368 InitializationKind Kind 4369 = InitializationKind::CreateDirect(VDecl->getLocation(), 4370 LParenLoc, RParenLoc); 4371 4372 InitializationSequence InitSeq(*this, Entity, Kind, 4373 (Expr**)Exprs.get(), Exprs.size()); 4374 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4375 if (Result.isInvalid()) { 4376 VDecl->setInvalidDecl(); 4377 return; 4378 } 4379 4380 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4381 VDecl->setInit(Result.takeAs<Expr>()); 4382 VDecl->setCXXDirectInitializer(true); 4383 4384 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4385 FinalizeVarWithDestructor(VDecl, Record); 4386} 4387 4388/// \brief Given a constructor and the set of arguments provided for the 4389/// constructor, convert the arguments and add any required default arguments 4390/// to form a proper call to this constructor. 4391/// 4392/// \returns true if an error occurred, false otherwise. 4393bool 4394Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4395 MultiExprArg ArgsPtr, 4396 SourceLocation Loc, 4397 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4398 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4399 unsigned NumArgs = ArgsPtr.size(); 4400 Expr **Args = (Expr **)ArgsPtr.get(); 4401 4402 const FunctionProtoType *Proto 4403 = Constructor->getType()->getAs<FunctionProtoType>(); 4404 assert(Proto && "Constructor without a prototype?"); 4405 unsigned NumArgsInProto = Proto->getNumArgs(); 4406 4407 // If too few arguments are available, we'll fill in the rest with defaults. 4408 if (NumArgs < NumArgsInProto) 4409 ConvertedArgs.reserve(NumArgsInProto); 4410 else 4411 ConvertedArgs.reserve(NumArgs); 4412 4413 VariadicCallType CallType = 4414 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4415 llvm::SmallVector<Expr *, 8> AllArgs; 4416 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4417 Proto, 0, Args, NumArgs, AllArgs, 4418 CallType); 4419 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4420 ConvertedArgs.push_back(AllArgs[i]); 4421 return Invalid; 4422} 4423 4424static inline bool 4425CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4426 const FunctionDecl *FnDecl) { 4427 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4428 if (isa<NamespaceDecl>(DC)) { 4429 return SemaRef.Diag(FnDecl->getLocation(), 4430 diag::err_operator_new_delete_declared_in_namespace) 4431 << FnDecl->getDeclName(); 4432 } 4433 4434 if (isa<TranslationUnitDecl>(DC) && 4435 FnDecl->getStorageClass() == FunctionDecl::Static) { 4436 return SemaRef.Diag(FnDecl->getLocation(), 4437 diag::err_operator_new_delete_declared_static) 4438 << FnDecl->getDeclName(); 4439 } 4440 4441 return false; 4442} 4443 4444static inline bool 4445CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4446 CanQualType ExpectedResultType, 4447 CanQualType ExpectedFirstParamType, 4448 unsigned DependentParamTypeDiag, 4449 unsigned InvalidParamTypeDiag) { 4450 QualType ResultType = 4451 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4452 4453 // Check that the result type is not dependent. 4454 if (ResultType->isDependentType()) 4455 return SemaRef.Diag(FnDecl->getLocation(), 4456 diag::err_operator_new_delete_dependent_result_type) 4457 << FnDecl->getDeclName() << ExpectedResultType; 4458 4459 // Check that the result type is what we expect. 4460 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4461 return SemaRef.Diag(FnDecl->getLocation(), 4462 diag::err_operator_new_delete_invalid_result_type) 4463 << FnDecl->getDeclName() << ExpectedResultType; 4464 4465 // A function template must have at least 2 parameters. 4466 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4467 return SemaRef.Diag(FnDecl->getLocation(), 4468 diag::err_operator_new_delete_template_too_few_parameters) 4469 << FnDecl->getDeclName(); 4470 4471 // The function decl must have at least 1 parameter. 4472 if (FnDecl->getNumParams() == 0) 4473 return SemaRef.Diag(FnDecl->getLocation(), 4474 diag::err_operator_new_delete_too_few_parameters) 4475 << FnDecl->getDeclName(); 4476 4477 // Check the the first parameter type is not dependent. 4478 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4479 if (FirstParamType->isDependentType()) 4480 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4481 << FnDecl->getDeclName() << ExpectedFirstParamType; 4482 4483 // Check that the first parameter type is what we expect. 4484 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4485 ExpectedFirstParamType) 4486 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4487 << FnDecl->getDeclName() << ExpectedFirstParamType; 4488 4489 return false; 4490} 4491 4492static bool 4493CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4494 // C++ [basic.stc.dynamic.allocation]p1: 4495 // A program is ill-formed if an allocation function is declared in a 4496 // namespace scope other than global scope or declared static in global 4497 // scope. 4498 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4499 return true; 4500 4501 CanQualType SizeTy = 4502 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4503 4504 // C++ [basic.stc.dynamic.allocation]p1: 4505 // The return type shall be void*. The first parameter shall have type 4506 // std::size_t. 4507 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4508 SizeTy, 4509 diag::err_operator_new_dependent_param_type, 4510 diag::err_operator_new_param_type)) 4511 return true; 4512 4513 // C++ [basic.stc.dynamic.allocation]p1: 4514 // The first parameter shall not have an associated default argument. 4515 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4516 return SemaRef.Diag(FnDecl->getLocation(), 4517 diag::err_operator_new_default_arg) 4518 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4519 4520 return false; 4521} 4522 4523static bool 4524CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4525 // C++ [basic.stc.dynamic.deallocation]p1: 4526 // A program is ill-formed if deallocation functions are declared in a 4527 // namespace scope other than global scope or declared static in global 4528 // scope. 4529 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4530 return true; 4531 4532 // C++ [basic.stc.dynamic.deallocation]p2: 4533 // Each deallocation function shall return void and its first parameter 4534 // shall be void*. 4535 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4536 SemaRef.Context.VoidPtrTy, 4537 diag::err_operator_delete_dependent_param_type, 4538 diag::err_operator_delete_param_type)) 4539 return true; 4540 4541 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4542 if (FirstParamType->isDependentType()) 4543 return SemaRef.Diag(FnDecl->getLocation(), 4544 diag::err_operator_delete_dependent_param_type) 4545 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4546 4547 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4548 SemaRef.Context.VoidPtrTy) 4549 return SemaRef.Diag(FnDecl->getLocation(), 4550 diag::err_operator_delete_param_type) 4551 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4552 4553 return false; 4554} 4555 4556/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4557/// of this overloaded operator is well-formed. If so, returns false; 4558/// otherwise, emits appropriate diagnostics and returns true. 4559bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4560 assert(FnDecl && FnDecl->isOverloadedOperator() && 4561 "Expected an overloaded operator declaration"); 4562 4563 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4564 4565 // C++ [over.oper]p5: 4566 // The allocation and deallocation functions, operator new, 4567 // operator new[], operator delete and operator delete[], are 4568 // described completely in 3.7.3. The attributes and restrictions 4569 // found in the rest of this subclause do not apply to them unless 4570 // explicitly stated in 3.7.3. 4571 if (Op == OO_Delete || Op == OO_Array_Delete) 4572 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4573 4574 if (Op == OO_New || Op == OO_Array_New) 4575 return CheckOperatorNewDeclaration(*this, FnDecl); 4576 4577 // C++ [over.oper]p6: 4578 // An operator function shall either be a non-static member 4579 // function or be a non-member function and have at least one 4580 // parameter whose type is a class, a reference to a class, an 4581 // enumeration, or a reference to an enumeration. 4582 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4583 if (MethodDecl->isStatic()) 4584 return Diag(FnDecl->getLocation(), 4585 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4586 } else { 4587 bool ClassOrEnumParam = false; 4588 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4589 ParamEnd = FnDecl->param_end(); 4590 Param != ParamEnd; ++Param) { 4591 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4592 if (ParamType->isDependentType() || ParamType->isRecordType() || 4593 ParamType->isEnumeralType()) { 4594 ClassOrEnumParam = true; 4595 break; 4596 } 4597 } 4598 4599 if (!ClassOrEnumParam) 4600 return Diag(FnDecl->getLocation(), 4601 diag::err_operator_overload_needs_class_or_enum) 4602 << FnDecl->getDeclName(); 4603 } 4604 4605 // C++ [over.oper]p8: 4606 // An operator function cannot have default arguments (8.3.6), 4607 // except where explicitly stated below. 4608 // 4609 // Only the function-call operator allows default arguments 4610 // (C++ [over.call]p1). 4611 if (Op != OO_Call) { 4612 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4613 Param != FnDecl->param_end(); ++Param) { 4614 if ((*Param)->hasDefaultArg()) 4615 return Diag((*Param)->getLocation(), 4616 diag::err_operator_overload_default_arg) 4617 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4618 } 4619 } 4620 4621 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4622 { false, false, false } 4623#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4624 , { Unary, Binary, MemberOnly } 4625#include "clang/Basic/OperatorKinds.def" 4626 }; 4627 4628 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4629 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4630 bool MustBeMemberOperator = OperatorUses[Op][2]; 4631 4632 // C++ [over.oper]p8: 4633 // [...] Operator functions cannot have more or fewer parameters 4634 // than the number required for the corresponding operator, as 4635 // described in the rest of this subclause. 4636 unsigned NumParams = FnDecl->getNumParams() 4637 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4638 if (Op != OO_Call && 4639 ((NumParams == 1 && !CanBeUnaryOperator) || 4640 (NumParams == 2 && !CanBeBinaryOperator) || 4641 (NumParams < 1) || (NumParams > 2))) { 4642 // We have the wrong number of parameters. 4643 unsigned ErrorKind; 4644 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4645 ErrorKind = 2; // 2 -> unary or binary. 4646 } else if (CanBeUnaryOperator) { 4647 ErrorKind = 0; // 0 -> unary 4648 } else { 4649 assert(CanBeBinaryOperator && 4650 "All non-call overloaded operators are unary or binary!"); 4651 ErrorKind = 1; // 1 -> binary 4652 } 4653 4654 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4655 << FnDecl->getDeclName() << NumParams << ErrorKind; 4656 } 4657 4658 // Overloaded operators other than operator() cannot be variadic. 4659 if (Op != OO_Call && 4660 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4661 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4662 << FnDecl->getDeclName(); 4663 } 4664 4665 // Some operators must be non-static member functions. 4666 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4667 return Diag(FnDecl->getLocation(), 4668 diag::err_operator_overload_must_be_member) 4669 << FnDecl->getDeclName(); 4670 } 4671 4672 // C++ [over.inc]p1: 4673 // The user-defined function called operator++ implements the 4674 // prefix and postfix ++ operator. If this function is a member 4675 // function with no parameters, or a non-member function with one 4676 // parameter of class or enumeration type, it defines the prefix 4677 // increment operator ++ for objects of that type. If the function 4678 // is a member function with one parameter (which shall be of type 4679 // int) or a non-member function with two parameters (the second 4680 // of which shall be of type int), it defines the postfix 4681 // increment operator ++ for objects of that type. 4682 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 4683 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 4684 bool ParamIsInt = false; 4685 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 4686 ParamIsInt = BT->getKind() == BuiltinType::Int; 4687 4688 if (!ParamIsInt) 4689 return Diag(LastParam->getLocation(), 4690 diag::err_operator_overload_post_incdec_must_be_int) 4691 << LastParam->getType() << (Op == OO_MinusMinus); 4692 } 4693 4694 // Notify the class if it got an assignment operator. 4695 if (Op == OO_Equal) { 4696 // Would have returned earlier otherwise. 4697 assert(isa<CXXMethodDecl>(FnDecl) && 4698 "Overloaded = not member, but not filtered."); 4699 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 4700 Method->getParent()->addedAssignmentOperator(Context, Method); 4701 } 4702 4703 return false; 4704} 4705 4706/// CheckLiteralOperatorDeclaration - Check whether the declaration 4707/// of this literal operator function is well-formed. If so, returns 4708/// false; otherwise, emits appropriate diagnostics and returns true. 4709bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 4710 DeclContext *DC = FnDecl->getDeclContext(); 4711 Decl::Kind Kind = DC->getDeclKind(); 4712 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 4713 Kind != Decl::LinkageSpec) { 4714 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 4715 << FnDecl->getDeclName(); 4716 return true; 4717 } 4718 4719 bool Valid = false; 4720 4721 // template <char...> type operator "" name() is the only valid template 4722 // signature, and the only valid signature with no parameters. 4723 if (FnDecl->param_size() == 0) { 4724 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 4725 // Must have only one template parameter 4726 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 4727 if (Params->size() == 1) { 4728 NonTypeTemplateParmDecl *PmDecl = 4729 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 4730 4731 // The template parameter must be a char parameter pack. 4732 // FIXME: This test will always fail because non-type parameter packs 4733 // have not been implemented. 4734 if (PmDecl && PmDecl->isTemplateParameterPack() && 4735 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 4736 Valid = true; 4737 } 4738 } 4739 } else { 4740 // Check the first parameter 4741 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4742 4743 QualType T = (*Param)->getType(); 4744 4745 // unsigned long long int, long double, and any character type are allowed 4746 // as the only parameters. 4747 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 4748 Context.hasSameType(T, Context.LongDoubleTy) || 4749 Context.hasSameType(T, Context.CharTy) || 4750 Context.hasSameType(T, Context.WCharTy) || 4751 Context.hasSameType(T, Context.Char16Ty) || 4752 Context.hasSameType(T, Context.Char32Ty)) { 4753 if (++Param == FnDecl->param_end()) 4754 Valid = true; 4755 goto FinishedParams; 4756 } 4757 4758 // Otherwise it must be a pointer to const; let's strip those qualifiers. 4759 const PointerType *PT = T->getAs<PointerType>(); 4760 if (!PT) 4761 goto FinishedParams; 4762 T = PT->getPointeeType(); 4763 if (!T.isConstQualified()) 4764 goto FinishedParams; 4765 T = T.getUnqualifiedType(); 4766 4767 // Move on to the second parameter; 4768 ++Param; 4769 4770 // If there is no second parameter, the first must be a const char * 4771 if (Param == FnDecl->param_end()) { 4772 if (Context.hasSameType(T, Context.CharTy)) 4773 Valid = true; 4774 goto FinishedParams; 4775 } 4776 4777 // const char *, const wchar_t*, const char16_t*, and const char32_t* 4778 // are allowed as the first parameter to a two-parameter function 4779 if (!(Context.hasSameType(T, Context.CharTy) || 4780 Context.hasSameType(T, Context.WCharTy) || 4781 Context.hasSameType(T, Context.Char16Ty) || 4782 Context.hasSameType(T, Context.Char32Ty))) 4783 goto FinishedParams; 4784 4785 // The second and final parameter must be an std::size_t 4786 T = (*Param)->getType().getUnqualifiedType(); 4787 if (Context.hasSameType(T, Context.getSizeType()) && 4788 ++Param == FnDecl->param_end()) 4789 Valid = true; 4790 } 4791 4792 // FIXME: This diagnostic is absolutely terrible. 4793FinishedParams: 4794 if (!Valid) { 4795 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 4796 << FnDecl->getDeclName(); 4797 return true; 4798 } 4799 4800 return false; 4801} 4802 4803/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 4804/// linkage specification, including the language and (if present) 4805/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 4806/// the location of the language string literal, which is provided 4807/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 4808/// the '{' brace. Otherwise, this linkage specification does not 4809/// have any braces. 4810Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 4811 SourceLocation ExternLoc, 4812 SourceLocation LangLoc, 4813 const char *Lang, 4814 unsigned StrSize, 4815 SourceLocation LBraceLoc) { 4816 LinkageSpecDecl::LanguageIDs Language; 4817 if (strncmp(Lang, "\"C\"", StrSize) == 0) 4818 Language = LinkageSpecDecl::lang_c; 4819 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 4820 Language = LinkageSpecDecl::lang_cxx; 4821 else { 4822 Diag(LangLoc, diag::err_bad_language); 4823 return DeclPtrTy(); 4824 } 4825 4826 // FIXME: Add all the various semantics of linkage specifications 4827 4828 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 4829 LangLoc, Language, 4830 LBraceLoc.isValid()); 4831 CurContext->addDecl(D); 4832 PushDeclContext(S, D); 4833 return DeclPtrTy::make(D); 4834} 4835 4836/// ActOnFinishLinkageSpecification - Completely the definition of 4837/// the C++ linkage specification LinkageSpec. If RBraceLoc is 4838/// valid, it's the position of the closing '}' brace in a linkage 4839/// specification that uses braces. 4840Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 4841 DeclPtrTy LinkageSpec, 4842 SourceLocation RBraceLoc) { 4843 if (LinkageSpec) 4844 PopDeclContext(); 4845 return LinkageSpec; 4846} 4847 4848/// \brief Perform semantic analysis for the variable declaration that 4849/// occurs within a C++ catch clause, returning the newly-created 4850/// variable. 4851VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 4852 TypeSourceInfo *TInfo, 4853 IdentifierInfo *Name, 4854 SourceLocation Loc, 4855 SourceRange Range) { 4856 bool Invalid = false; 4857 4858 // Arrays and functions decay. 4859 if (ExDeclType->isArrayType()) 4860 ExDeclType = Context.getArrayDecayedType(ExDeclType); 4861 else if (ExDeclType->isFunctionType()) 4862 ExDeclType = Context.getPointerType(ExDeclType); 4863 4864 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 4865 // The exception-declaration shall not denote a pointer or reference to an 4866 // incomplete type, other than [cv] void*. 4867 // N2844 forbids rvalue references. 4868 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 4869 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 4870 Invalid = true; 4871 } 4872 4873 // GCC allows catching pointers and references to incomplete types 4874 // as an extension; so do we, but we warn by default. 4875 4876 QualType BaseType = ExDeclType; 4877 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 4878 unsigned DK = diag::err_catch_incomplete; 4879 bool IncompleteCatchIsInvalid = true; 4880 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 4881 BaseType = Ptr->getPointeeType(); 4882 Mode = 1; 4883 DK = diag::ext_catch_incomplete_ptr; 4884 IncompleteCatchIsInvalid = false; 4885 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 4886 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 4887 BaseType = Ref->getPointeeType(); 4888 Mode = 2; 4889 DK = diag::ext_catch_incomplete_ref; 4890 IncompleteCatchIsInvalid = false; 4891 } 4892 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 4893 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 4894 IncompleteCatchIsInvalid) 4895 Invalid = true; 4896 4897 if (!Invalid && !ExDeclType->isDependentType() && 4898 RequireNonAbstractType(Loc, ExDeclType, 4899 diag::err_abstract_type_in_decl, 4900 AbstractVariableType)) 4901 Invalid = true; 4902 4903 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 4904 Name, ExDeclType, TInfo, VarDecl::None, 4905 VarDecl::None); 4906 4907 if (!Invalid) { 4908 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 4909 // C++ [except.handle]p16: 4910 // The object declared in an exception-declaration or, if the 4911 // exception-declaration does not specify a name, a temporary (12.2) is 4912 // copy-initialized (8.5) from the exception object. [...] 4913 // The object is destroyed when the handler exits, after the destruction 4914 // of any automatic objects initialized within the handler. 4915 // 4916 // We just pretend to initialize the object with itself, then make sure 4917 // it can be destroyed later. 4918 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 4919 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 4920 Loc, ExDeclType, 0); 4921 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 4922 SourceLocation()); 4923 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 4924 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4925 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 4926 if (Result.isInvalid()) 4927 Invalid = true; 4928 else 4929 FinalizeVarWithDestructor(ExDecl, RecordTy); 4930 } 4931 } 4932 4933 if (Invalid) 4934 ExDecl->setInvalidDecl(); 4935 4936 return ExDecl; 4937} 4938 4939/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 4940/// handler. 4941Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 4942 TypeSourceInfo *TInfo = 0; 4943 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 4944 4945 bool Invalid = D.isInvalidType(); 4946 IdentifierInfo *II = D.getIdentifier(); 4947 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 4948 LookupOrdinaryName, 4949 ForRedeclaration)) { 4950 // The scope should be freshly made just for us. There is just no way 4951 // it contains any previous declaration. 4952 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 4953 if (PrevDecl->isTemplateParameter()) { 4954 // Maybe we will complain about the shadowed template parameter. 4955 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4956 } 4957 } 4958 4959 if (D.getCXXScopeSpec().isSet() && !Invalid) { 4960 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 4961 << D.getCXXScopeSpec().getRange(); 4962 Invalid = true; 4963 } 4964 4965 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 4966 D.getIdentifier(), 4967 D.getIdentifierLoc(), 4968 D.getDeclSpec().getSourceRange()); 4969 4970 if (Invalid) 4971 ExDecl->setInvalidDecl(); 4972 4973 // Add the exception declaration into this scope. 4974 if (II) 4975 PushOnScopeChains(ExDecl, S); 4976 else 4977 CurContext->addDecl(ExDecl); 4978 4979 ProcessDeclAttributes(S, ExDecl, D); 4980 return DeclPtrTy::make(ExDecl); 4981} 4982 4983Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 4984 ExprArg assertexpr, 4985 ExprArg assertmessageexpr) { 4986 Expr *AssertExpr = (Expr *)assertexpr.get(); 4987 StringLiteral *AssertMessage = 4988 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 4989 4990 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 4991 llvm::APSInt Value(32); 4992 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 4993 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 4994 AssertExpr->getSourceRange(); 4995 return DeclPtrTy(); 4996 } 4997 4998 if (Value == 0) { 4999 Diag(AssertLoc, diag::err_static_assert_failed) 5000 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5001 } 5002 } 5003 5004 assertexpr.release(); 5005 assertmessageexpr.release(); 5006 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5007 AssertExpr, AssertMessage); 5008 5009 CurContext->addDecl(Decl); 5010 return DeclPtrTy::make(Decl); 5011} 5012 5013/// \brief Perform semantic analysis of the given friend type declaration. 5014/// 5015/// \returns A friend declaration that. 5016FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 5017 TypeSourceInfo *TSInfo) { 5018 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 5019 5020 QualType T = TSInfo->getType(); 5021 SourceRange TypeRange = TSInfo->getTypeLoc().getSourceRange(); 5022 5023 if (!getLangOptions().CPlusPlus0x) { 5024 // C++03 [class.friend]p2: 5025 // An elaborated-type-specifier shall be used in a friend declaration 5026 // for a class.* 5027 // 5028 // * The class-key of the elaborated-type-specifier is required. 5029 if (!ActiveTemplateInstantiations.empty()) { 5030 // Do not complain about the form of friend template types during 5031 // template instantiation; we will already have complained when the 5032 // template was declared. 5033 } else if (!T->isElaboratedTypeSpecifier()) { 5034 // If we evaluated the type to a record type, suggest putting 5035 // a tag in front. 5036 if (const RecordType *RT = T->getAs<RecordType>()) { 5037 RecordDecl *RD = RT->getDecl(); 5038 5039 std::string InsertionText = std::string(" ") + RD->getKindName(); 5040 5041 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 5042 << (unsigned) RD->getTagKind() 5043 << T 5044 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 5045 InsertionText); 5046 } else { 5047 Diag(FriendLoc, diag::ext_nonclass_type_friend) 5048 << T 5049 << SourceRange(FriendLoc, TypeRange.getEnd()); 5050 } 5051 } else if (T->getAs<EnumType>()) { 5052 Diag(FriendLoc, diag::ext_enum_friend) 5053 << T 5054 << SourceRange(FriendLoc, TypeRange.getEnd()); 5055 } 5056 } 5057 5058 // C++0x [class.friend]p3: 5059 // If the type specifier in a friend declaration designates a (possibly 5060 // cv-qualified) class type, that class is declared as a friend; otherwise, 5061 // the friend declaration is ignored. 5062 5063 // FIXME: C++0x has some syntactic restrictions on friend type declarations 5064 // in [class.friend]p3 that we do not implement. 5065 5066 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 5067} 5068 5069/// Handle a friend type declaration. This works in tandem with 5070/// ActOnTag. 5071/// 5072/// Notes on friend class templates: 5073/// 5074/// We generally treat friend class declarations as if they were 5075/// declaring a class. So, for example, the elaborated type specifier 5076/// in a friend declaration is required to obey the restrictions of a 5077/// class-head (i.e. no typedefs in the scope chain), template 5078/// parameters are required to match up with simple template-ids, &c. 5079/// However, unlike when declaring a template specialization, it's 5080/// okay to refer to a template specialization without an empty 5081/// template parameter declaration, e.g. 5082/// friend class A<T>::B<unsigned>; 5083/// We permit this as a special case; if there are any template 5084/// parameters present at all, require proper matching, i.e. 5085/// template <> template <class T> friend class A<int>::B; 5086Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5087 MultiTemplateParamsArg TempParams) { 5088 SourceLocation Loc = DS.getSourceRange().getBegin(); 5089 5090 assert(DS.isFriendSpecified()); 5091 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5092 5093 // Try to convert the decl specifier to a type. This works for 5094 // friend templates because ActOnTag never produces a ClassTemplateDecl 5095 // for a TUK_Friend. 5096 Declarator TheDeclarator(DS, Declarator::MemberContext); 5097 TypeSourceInfo *TSI; 5098 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 5099 if (TheDeclarator.isInvalidType()) 5100 return DeclPtrTy(); 5101 5102 if (!TSI) 5103 TSI = Context.getTrivialTypeSourceInfo(T, DS.getSourceRange().getBegin()); 5104 5105 // This is definitely an error in C++98. It's probably meant to 5106 // be forbidden in C++0x, too, but the specification is just 5107 // poorly written. 5108 // 5109 // The problem is with declarations like the following: 5110 // template <T> friend A<T>::foo; 5111 // where deciding whether a class C is a friend or not now hinges 5112 // on whether there exists an instantiation of A that causes 5113 // 'foo' to equal C. There are restrictions on class-heads 5114 // (which we declare (by fiat) elaborated friend declarations to 5115 // be) that makes this tractable. 5116 // 5117 // FIXME: handle "template <> friend class A<T>;", which 5118 // is possibly well-formed? Who even knows? 5119 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5120 Diag(Loc, diag::err_tagless_friend_type_template) 5121 << DS.getSourceRange(); 5122 return DeclPtrTy(); 5123 } 5124 5125 // C++98 [class.friend]p1: A friend of a class is a function 5126 // or class that is not a member of the class . . . 5127 // This is fixed in DR77, which just barely didn't make the C++03 5128 // deadline. It's also a very silly restriction that seriously 5129 // affects inner classes and which nobody else seems to implement; 5130 // thus we never diagnose it, not even in -pedantic. 5131 // 5132 // But note that we could warn about it: it's always useless to 5133 // friend one of your own members (it's not, however, worthless to 5134 // friend a member of an arbitrary specialization of your template). 5135 5136 Decl *D; 5137 if (unsigned NumTempParamLists = TempParams.size()) 5138 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5139 NumTempParamLists, 5140 (TemplateParameterList**) TempParams.release(), 5141 TSI, 5142 DS.getFriendSpecLoc()); 5143 else 5144 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 5145 5146 if (!D) 5147 return DeclPtrTy(); 5148 5149 D->setAccess(AS_public); 5150 CurContext->addDecl(D); 5151 5152 return DeclPtrTy::make(D); 5153} 5154 5155Sema::DeclPtrTy 5156Sema::ActOnFriendFunctionDecl(Scope *S, 5157 Declarator &D, 5158 bool IsDefinition, 5159 MultiTemplateParamsArg TemplateParams) { 5160 const DeclSpec &DS = D.getDeclSpec(); 5161 5162 assert(DS.isFriendSpecified()); 5163 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5164 5165 SourceLocation Loc = D.getIdentifierLoc(); 5166 TypeSourceInfo *TInfo = 0; 5167 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5168 5169 // C++ [class.friend]p1 5170 // A friend of a class is a function or class.... 5171 // Note that this sees through typedefs, which is intended. 5172 // It *doesn't* see through dependent types, which is correct 5173 // according to [temp.arg.type]p3: 5174 // If a declaration acquires a function type through a 5175 // type dependent on a template-parameter and this causes 5176 // a declaration that does not use the syntactic form of a 5177 // function declarator to have a function type, the program 5178 // is ill-formed. 5179 if (!T->isFunctionType()) { 5180 Diag(Loc, diag::err_unexpected_friend); 5181 5182 // It might be worthwhile to try to recover by creating an 5183 // appropriate declaration. 5184 return DeclPtrTy(); 5185 } 5186 5187 // C++ [namespace.memdef]p3 5188 // - If a friend declaration in a non-local class first declares a 5189 // class or function, the friend class or function is a member 5190 // of the innermost enclosing namespace. 5191 // - The name of the friend is not found by simple name lookup 5192 // until a matching declaration is provided in that namespace 5193 // scope (either before or after the class declaration granting 5194 // friendship). 5195 // - If a friend function is called, its name may be found by the 5196 // name lookup that considers functions from namespaces and 5197 // classes associated with the types of the function arguments. 5198 // - When looking for a prior declaration of a class or a function 5199 // declared as a friend, scopes outside the innermost enclosing 5200 // namespace scope are not considered. 5201 5202 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5203 DeclarationName Name = GetNameForDeclarator(D); 5204 assert(Name); 5205 5206 // The context we found the declaration in, or in which we should 5207 // create the declaration. 5208 DeclContext *DC; 5209 5210 // FIXME: handle local classes 5211 5212 // Recover from invalid scope qualifiers as if they just weren't there. 5213 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5214 ForRedeclaration); 5215 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5216 // FIXME: RequireCompleteDeclContext 5217 DC = computeDeclContext(ScopeQual); 5218 5219 // FIXME: handle dependent contexts 5220 if (!DC) return DeclPtrTy(); 5221 5222 LookupQualifiedName(Previous, DC); 5223 5224 // If searching in that context implicitly found a declaration in 5225 // a different context, treat it like it wasn't found at all. 5226 // TODO: better diagnostics for this case. Suggesting the right 5227 // qualified scope would be nice... 5228 // FIXME: getRepresentativeDecl() is not right here at all 5229 if (Previous.empty() || 5230 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5231 D.setInvalidType(); 5232 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5233 return DeclPtrTy(); 5234 } 5235 5236 // C++ [class.friend]p1: A friend of a class is a function or 5237 // class that is not a member of the class . . . 5238 if (DC->Equals(CurContext)) 5239 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5240 5241 // Otherwise walk out to the nearest namespace scope looking for matches. 5242 } else { 5243 // TODO: handle local class contexts. 5244 5245 DC = CurContext; 5246 while (true) { 5247 // Skip class contexts. If someone can cite chapter and verse 5248 // for this behavior, that would be nice --- it's what GCC and 5249 // EDG do, and it seems like a reasonable intent, but the spec 5250 // really only says that checks for unqualified existing 5251 // declarations should stop at the nearest enclosing namespace, 5252 // not that they should only consider the nearest enclosing 5253 // namespace. 5254 while (DC->isRecord()) 5255 DC = DC->getParent(); 5256 5257 LookupQualifiedName(Previous, DC); 5258 5259 // TODO: decide what we think about using declarations. 5260 if (!Previous.empty()) 5261 break; 5262 5263 if (DC->isFileContext()) break; 5264 DC = DC->getParent(); 5265 } 5266 5267 // C++ [class.friend]p1: A friend of a class is a function or 5268 // class that is not a member of the class . . . 5269 // C++0x changes this for both friend types and functions. 5270 // Most C++ 98 compilers do seem to give an error here, so 5271 // we do, too. 5272 if (!Previous.empty() && DC->Equals(CurContext) 5273 && !getLangOptions().CPlusPlus0x) 5274 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5275 } 5276 5277 if (DC->isFileContext()) { 5278 // This implies that it has to be an operator or function. 5279 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5280 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5281 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5282 Diag(Loc, diag::err_introducing_special_friend) << 5283 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5284 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5285 return DeclPtrTy(); 5286 } 5287 } 5288 5289 bool Redeclaration = false; 5290 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5291 move(TemplateParams), 5292 IsDefinition, 5293 Redeclaration); 5294 if (!ND) return DeclPtrTy(); 5295 5296 assert(ND->getDeclContext() == DC); 5297 assert(ND->getLexicalDeclContext() == CurContext); 5298 5299 // Add the function declaration to the appropriate lookup tables, 5300 // adjusting the redeclarations list as necessary. We don't 5301 // want to do this yet if the friending class is dependent. 5302 // 5303 // Also update the scope-based lookup if the target context's 5304 // lookup context is in lexical scope. 5305 if (!CurContext->isDependentContext()) { 5306 DC = DC->getLookupContext(); 5307 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5308 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5309 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5310 } 5311 5312 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5313 D.getIdentifierLoc(), ND, 5314 DS.getFriendSpecLoc()); 5315 FrD->setAccess(AS_public); 5316 CurContext->addDecl(FrD); 5317 5318 return DeclPtrTy::make(ND); 5319} 5320 5321void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5322 AdjustDeclIfTemplate(dcl); 5323 5324 Decl *Dcl = dcl.getAs<Decl>(); 5325 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5326 if (!Fn) { 5327 Diag(DelLoc, diag::err_deleted_non_function); 5328 return; 5329 } 5330 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5331 Diag(DelLoc, diag::err_deleted_decl_not_first); 5332 Diag(Prev->getLocation(), diag::note_previous_declaration); 5333 // If the declaration wasn't the first, we delete the function anyway for 5334 // recovery. 5335 } 5336 Fn->setDeleted(); 5337} 5338 5339static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5340 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5341 ++CI) { 5342 Stmt *SubStmt = *CI; 5343 if (!SubStmt) 5344 continue; 5345 if (isa<ReturnStmt>(SubStmt)) 5346 Self.Diag(SubStmt->getSourceRange().getBegin(), 5347 diag::err_return_in_constructor_handler); 5348 if (!isa<Expr>(SubStmt)) 5349 SearchForReturnInStmt(Self, SubStmt); 5350 } 5351} 5352 5353void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5354 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5355 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5356 SearchForReturnInStmt(*this, Handler); 5357 } 5358} 5359 5360bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5361 const CXXMethodDecl *Old) { 5362 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5363 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5364 5365 if (Context.hasSameType(NewTy, OldTy) || 5366 NewTy->isDependentType() || OldTy->isDependentType()) 5367 return false; 5368 5369 // Check if the return types are covariant 5370 QualType NewClassTy, OldClassTy; 5371 5372 /// Both types must be pointers or references to classes. 5373 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5374 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5375 NewClassTy = NewPT->getPointeeType(); 5376 OldClassTy = OldPT->getPointeeType(); 5377 } 5378 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5379 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5380 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5381 NewClassTy = NewRT->getPointeeType(); 5382 OldClassTy = OldRT->getPointeeType(); 5383 } 5384 } 5385 } 5386 5387 // The return types aren't either both pointers or references to a class type. 5388 if (NewClassTy.isNull()) { 5389 Diag(New->getLocation(), 5390 diag::err_different_return_type_for_overriding_virtual_function) 5391 << New->getDeclName() << NewTy << OldTy; 5392 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5393 5394 return true; 5395 } 5396 5397 // C++ [class.virtual]p6: 5398 // If the return type of D::f differs from the return type of B::f, the 5399 // class type in the return type of D::f shall be complete at the point of 5400 // declaration of D::f or shall be the class type D. 5401 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5402 if (!RT->isBeingDefined() && 5403 RequireCompleteType(New->getLocation(), NewClassTy, 5404 PDiag(diag::err_covariant_return_incomplete) 5405 << New->getDeclName())) 5406 return true; 5407 } 5408 5409 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5410 // Check if the new class derives from the old class. 5411 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5412 Diag(New->getLocation(), 5413 diag::err_covariant_return_not_derived) 5414 << New->getDeclName() << NewTy << OldTy; 5415 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5416 return true; 5417 } 5418 5419 // Check if we the conversion from derived to base is valid. 5420 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5421 diag::err_covariant_return_inaccessible_base, 5422 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5423 // FIXME: Should this point to the return type? 5424 New->getLocation(), SourceRange(), New->getDeclName())) { 5425 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5426 return true; 5427 } 5428 } 5429 5430 // The qualifiers of the return types must be the same. 5431 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5432 Diag(New->getLocation(), 5433 diag::err_covariant_return_type_different_qualifications) 5434 << New->getDeclName() << NewTy << OldTy; 5435 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5436 return true; 5437 }; 5438 5439 5440 // The new class type must have the same or less qualifiers as the old type. 5441 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5442 Diag(New->getLocation(), 5443 diag::err_covariant_return_type_class_type_more_qualified) 5444 << New->getDeclName() << NewTy << OldTy; 5445 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5446 return true; 5447 }; 5448 5449 return false; 5450} 5451 5452bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5453 const CXXMethodDecl *Old) 5454{ 5455 if (Old->hasAttr<FinalAttr>()) { 5456 Diag(New->getLocation(), diag::err_final_function_overridden) 5457 << New->getDeclName(); 5458 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5459 return true; 5460 } 5461 5462 return false; 5463} 5464 5465/// \brief Mark the given method pure. 5466/// 5467/// \param Method the method to be marked pure. 5468/// 5469/// \param InitRange the source range that covers the "0" initializer. 5470bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5471 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5472 Method->setPure(); 5473 5474 // A class is abstract if at least one function is pure virtual. 5475 Method->getParent()->setAbstract(true); 5476 return false; 5477 } 5478 5479 if (!Method->isInvalidDecl()) 5480 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5481 << Method->getDeclName() << InitRange; 5482 return true; 5483} 5484 5485/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5486/// an initializer for the out-of-line declaration 'Dcl'. The scope 5487/// is a fresh scope pushed for just this purpose. 5488/// 5489/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5490/// static data member of class X, names should be looked up in the scope of 5491/// class X. 5492void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5493 // If there is no declaration, there was an error parsing it. 5494 Decl *D = Dcl.getAs<Decl>(); 5495 if (D == 0) return; 5496 5497 // We should only get called for declarations with scope specifiers, like: 5498 // int foo::bar; 5499 assert(D->isOutOfLine()); 5500 EnterDeclaratorContext(S, D->getDeclContext()); 5501} 5502 5503/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5504/// initializer for the out-of-line declaration 'Dcl'. 5505void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5506 // If there is no declaration, there was an error parsing it. 5507 Decl *D = Dcl.getAs<Decl>(); 5508 if (D == 0) return; 5509 5510 assert(D->isOutOfLine()); 5511 ExitDeclaratorContext(S); 5512} 5513 5514/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5515/// C++ if/switch/while/for statement. 5516/// e.g: "if (int x = f()) {...}" 5517Action::DeclResult 5518Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5519 // C++ 6.4p2: 5520 // The declarator shall not specify a function or an array. 5521 // The type-specifier-seq shall not contain typedef and shall not declare a 5522 // new class or enumeration. 5523 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5524 "Parser allowed 'typedef' as storage class of condition decl."); 5525 5526 TypeSourceInfo *TInfo = 0; 5527 TagDecl *OwnedTag = 0; 5528 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5529 5530 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5531 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5532 // would be created and CXXConditionDeclExpr wants a VarDecl. 5533 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5534 << D.getSourceRange(); 5535 return DeclResult(); 5536 } else if (OwnedTag && OwnedTag->isDefinition()) { 5537 // The type-specifier-seq shall not declare a new class or enumeration. 5538 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5539 } 5540 5541 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5542 if (!Dcl) 5543 return DeclResult(); 5544 5545 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5546 VD->setDeclaredInCondition(true); 5547 return Dcl; 5548} 5549 5550static bool needsVTable(CXXMethodDecl *MD, ASTContext &Context) { 5551 // Ignore dependent types. 5552 if (MD->isDependentContext()) 5553 return false; 5554 5555 // Ignore declarations that are not definitions. 5556 if (!MD->isThisDeclarationADefinition()) 5557 return false; 5558 5559 CXXRecordDecl *RD = MD->getParent(); 5560 5561 // Ignore classes without a vtable. 5562 if (!RD->isDynamicClass()) 5563 return false; 5564 5565 switch (MD->getParent()->getTemplateSpecializationKind()) { 5566 case TSK_Undeclared: 5567 case TSK_ExplicitSpecialization: 5568 // Classes that aren't instantiations of templates don't need their 5569 // virtual methods marked until we see the definition of the key 5570 // function. 5571 break; 5572 5573 case TSK_ImplicitInstantiation: 5574 // This is a constructor of a class template; mark all of the virtual 5575 // members as referenced to ensure that they get instantiatied. 5576 if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) 5577 return true; 5578 break; 5579 5580 case TSK_ExplicitInstantiationDeclaration: 5581 return false; 5582 5583 case TSK_ExplicitInstantiationDefinition: 5584 // This is method of a explicit instantiation; mark all of the virtual 5585 // members as referenced to ensure that they get instantiatied. 5586 return true; 5587 } 5588 5589 // Consider only out-of-line definitions of member functions. When we see 5590 // an inline definition, it's too early to compute the key function. 5591 if (!MD->isOutOfLine()) 5592 return false; 5593 5594 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5595 5596 // If there is no key function, we will need a copy of the vtable. 5597 if (!KeyFunction) 5598 return true; 5599 5600 // If this is the key function, we need to mark virtual members. 5601 if (KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) 5602 return true; 5603 5604 return false; 5605} 5606 5607void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5608 CXXMethodDecl *MD) { 5609 CXXRecordDecl *RD = MD->getParent(); 5610 5611 // We will need to mark all of the virtual members as referenced to build the 5612 // vtable. 5613 if (!needsVTable(MD, Context)) 5614 return; 5615 5616 TemplateSpecializationKind kind = RD->getTemplateSpecializationKind(); 5617 if (kind == TSK_ImplicitInstantiation) 5618 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 5619 else 5620 MarkVirtualMembersReferenced(Loc, RD); 5621} 5622 5623bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5624 if (ClassesWithUnmarkedVirtualMembers.empty()) 5625 return false; 5626 5627 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 5628 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 5629 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 5630 ClassesWithUnmarkedVirtualMembers.pop_back(); 5631 MarkVirtualMembersReferenced(Loc, RD); 5632 } 5633 5634 return true; 5635} 5636 5637void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 5638 const CXXRecordDecl *RD) { 5639 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5640 e = RD->method_end(); i != e; ++i) { 5641 CXXMethodDecl *MD = *i; 5642 5643 // C++ [basic.def.odr]p2: 5644 // [...] A virtual member function is used if it is not pure. [...] 5645 if (MD->isVirtual() && !MD->isPure()) 5646 MarkDeclarationReferenced(Loc, MD); 5647 } 5648 5649 // Only classes that have virtual bases need a VTT. 5650 if (RD->getNumVBases() == 0) 5651 return; 5652 5653 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 5654 e = RD->bases_end(); i != e; ++i) { 5655 const CXXRecordDecl *Base = 5656 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 5657 if (i->isVirtual()) 5658 continue; 5659 if (Base->getNumVBases() == 0) 5660 continue; 5661 MarkVirtualMembersReferenced(Loc, Base); 5662 } 5663} 5664