SemaDeclCXX.cpp revision 3e93ab1a7228f50b8051c167af25cafcffed2852
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/RecordLayout.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/TypeLoc.h" 23#include "clang/AST/TypeOrdering.h" 24#include "clang/AST/StmtVisitor.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Parse/Template.h" 27#include "clang/Basic/PartialDiagnostic.h" 28#include "clang/Lex/Preprocessor.h" 29#include "llvm/ADT/STLExtras.h" 30#include <map> 31#include <set> 32 33using namespace clang; 34 35//===----------------------------------------------------------------------===// 36// CheckDefaultArgumentVisitor 37//===----------------------------------------------------------------------===// 38 39namespace { 40 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 41 /// the default argument of a parameter to determine whether it 42 /// contains any ill-formed subexpressions. For example, this will 43 /// diagnose the use of local variables or parameters within the 44 /// default argument expression. 45 class CheckDefaultArgumentVisitor 46 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 47 Expr *DefaultArg; 48 Sema *S; 49 50 public: 51 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 52 : DefaultArg(defarg), S(s) {} 53 54 bool VisitExpr(Expr *Node); 55 bool VisitDeclRefExpr(DeclRefExpr *DRE); 56 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 57 }; 58 59 /// VisitExpr - Visit all of the children of this expression. 60 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 61 bool IsInvalid = false; 62 for (Stmt::child_iterator I = Node->child_begin(), 63 E = Node->child_end(); I != E; ++I) 64 IsInvalid |= Visit(*I); 65 return IsInvalid; 66 } 67 68 /// VisitDeclRefExpr - Visit a reference to a declaration, to 69 /// determine whether this declaration can be used in the default 70 /// argument expression. 71 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 72 NamedDecl *Decl = DRE->getDecl(); 73 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 74 // C++ [dcl.fct.default]p9 75 // Default arguments are evaluated each time the function is 76 // called. The order of evaluation of function arguments is 77 // unspecified. Consequently, parameters of a function shall not 78 // be used in default argument expressions, even if they are not 79 // evaluated. Parameters of a function declared before a default 80 // argument expression are in scope and can hide namespace and 81 // class member names. 82 return S->Diag(DRE->getSourceRange().getBegin(), 83 diag::err_param_default_argument_references_param) 84 << Param->getDeclName() << DefaultArg->getSourceRange(); 85 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 86 // C++ [dcl.fct.default]p7 87 // Local variables shall not be used in default argument 88 // expressions. 89 if (VDecl->isBlockVarDecl()) 90 return S->Diag(DRE->getSourceRange().getBegin(), 91 diag::err_param_default_argument_references_local) 92 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 93 } 94 95 return false; 96 } 97 98 /// VisitCXXThisExpr - Visit a C++ "this" expression. 99 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 100 // C++ [dcl.fct.default]p8: 101 // The keyword this shall not be used in a default argument of a 102 // member function. 103 return S->Diag(ThisE->getSourceRange().getBegin(), 104 diag::err_param_default_argument_references_this) 105 << ThisE->getSourceRange(); 106 } 107} 108 109bool 110Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 111 SourceLocation EqualLoc) { 112 if (RequireCompleteType(Param->getLocation(), Param->getType(), 113 diag::err_typecheck_decl_incomplete_type)) { 114 Param->setInvalidDecl(); 115 return true; 116 } 117 118 Expr *Arg = (Expr *)DefaultArg.get(); 119 120 // C++ [dcl.fct.default]p5 121 // A default argument expression is implicitly converted (clause 122 // 4) to the parameter type. The default argument expression has 123 // the same semantic constraints as the initializer expression in 124 // a declaration of a variable of the parameter type, using the 125 // copy-initialization semantics (8.5). 126 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 127 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 128 EqualLoc); 129 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 130 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 131 MultiExprArg(*this, (void**)&Arg, 1)); 132 if (Result.isInvalid()) 133 return true; 134 Arg = Result.takeAs<Expr>(); 135 136 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 137 138 // Okay: add the default argument to the parameter 139 Param->setDefaultArg(Arg); 140 141 DefaultArg.release(); 142 143 return false; 144} 145 146/// ActOnParamDefaultArgument - Check whether the default argument 147/// provided for a function parameter is well-formed. If so, attach it 148/// to the parameter declaration. 149void 150Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 151 ExprArg defarg) { 152 if (!param || !defarg.get()) 153 return; 154 155 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 156 UnparsedDefaultArgLocs.erase(Param); 157 158 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 159 160 // Default arguments are only permitted in C++ 161 if (!getLangOptions().CPlusPlus) { 162 Diag(EqualLoc, diag::err_param_default_argument) 163 << DefaultArg->getSourceRange(); 164 Param->setInvalidDecl(); 165 return; 166 } 167 168 // Check that the default argument is well-formed 169 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 170 if (DefaultArgChecker.Visit(DefaultArg.get())) { 171 Param->setInvalidDecl(); 172 return; 173 } 174 175 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 176} 177 178/// ActOnParamUnparsedDefaultArgument - We've seen a default 179/// argument for a function parameter, but we can't parse it yet 180/// because we're inside a class definition. Note that this default 181/// argument will be parsed later. 182void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 183 SourceLocation EqualLoc, 184 SourceLocation ArgLoc) { 185 if (!param) 186 return; 187 188 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 189 if (Param) 190 Param->setUnparsedDefaultArg(); 191 192 UnparsedDefaultArgLocs[Param] = ArgLoc; 193} 194 195/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 196/// the default argument for the parameter param failed. 197void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 198 if (!param) 199 return; 200 201 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 202 203 Param->setInvalidDecl(); 204 205 UnparsedDefaultArgLocs.erase(Param); 206} 207 208/// CheckExtraCXXDefaultArguments - Check for any extra default 209/// arguments in the declarator, which is not a function declaration 210/// or definition and therefore is not permitted to have default 211/// arguments. This routine should be invoked for every declarator 212/// that is not a function declaration or definition. 213void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 214 // C++ [dcl.fct.default]p3 215 // A default argument expression shall be specified only in the 216 // parameter-declaration-clause of a function declaration or in a 217 // template-parameter (14.1). It shall not be specified for a 218 // parameter pack. If it is specified in a 219 // parameter-declaration-clause, it shall not occur within a 220 // declarator or abstract-declarator of a parameter-declaration. 221 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 222 DeclaratorChunk &chunk = D.getTypeObject(i); 223 if (chunk.Kind == DeclaratorChunk::Function) { 224 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 225 ParmVarDecl *Param = 226 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 227 if (Param->hasUnparsedDefaultArg()) { 228 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 229 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 230 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 231 delete Toks; 232 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 233 } else if (Param->getDefaultArg()) { 234 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 235 << Param->getDefaultArg()->getSourceRange(); 236 Param->setDefaultArg(0); 237 } 238 } 239 } 240 } 241} 242 243// MergeCXXFunctionDecl - Merge two declarations of the same C++ 244// function, once we already know that they have the same 245// type. Subroutine of MergeFunctionDecl. Returns true if there was an 246// error, false otherwise. 247bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 248 bool Invalid = false; 249 250 // C++ [dcl.fct.default]p4: 251 // For non-template functions, default arguments can be added in 252 // later declarations of a function in the same 253 // scope. Declarations in different scopes have completely 254 // distinct sets of default arguments. That is, declarations in 255 // inner scopes do not acquire default arguments from 256 // declarations in outer scopes, and vice versa. In a given 257 // function declaration, all parameters subsequent to a 258 // parameter with a default argument shall have default 259 // arguments supplied in this or previous declarations. A 260 // default argument shall not be redefined by a later 261 // declaration (not even to the same value). 262 // 263 // C++ [dcl.fct.default]p6: 264 // Except for member functions of class templates, the default arguments 265 // in a member function definition that appears outside of the class 266 // definition are added to the set of default arguments provided by the 267 // member function declaration in the class definition. 268 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 269 ParmVarDecl *OldParam = Old->getParamDecl(p); 270 ParmVarDecl *NewParam = New->getParamDecl(p); 271 272 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 273 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 274 // hint here. Alternatively, we could walk the type-source information 275 // for NewParam to find the last source location in the type... but it 276 // isn't worth the effort right now. This is the kind of test case that 277 // is hard to get right: 278 279 // int f(int); 280 // void g(int (*fp)(int) = f); 281 // void g(int (*fp)(int) = &f); 282 Diag(NewParam->getLocation(), 283 diag::err_param_default_argument_redefinition) 284 << NewParam->getDefaultArgRange(); 285 286 // Look for the function declaration where the default argument was 287 // actually written, which may be a declaration prior to Old. 288 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 289 Older; Older = Older->getPreviousDeclaration()) { 290 if (!Older->getParamDecl(p)->hasDefaultArg()) 291 break; 292 293 OldParam = Older->getParamDecl(p); 294 } 295 296 Diag(OldParam->getLocation(), diag::note_previous_definition) 297 << OldParam->getDefaultArgRange(); 298 Invalid = true; 299 } else if (OldParam->hasDefaultArg()) { 300 // Merge the old default argument into the new parameter 301 NewParam->setHasInheritedDefaultArg(); 302 if (OldParam->hasUninstantiatedDefaultArg()) 303 NewParam->setUninstantiatedDefaultArg( 304 OldParam->getUninstantiatedDefaultArg()); 305 else 306 NewParam->setDefaultArg(OldParam->getDefaultArg()); 307 } else if (NewParam->hasDefaultArg()) { 308 if (New->getDescribedFunctionTemplate()) { 309 // Paragraph 4, quoted above, only applies to non-template functions. 310 Diag(NewParam->getLocation(), 311 diag::err_param_default_argument_template_redecl) 312 << NewParam->getDefaultArgRange(); 313 Diag(Old->getLocation(), diag::note_template_prev_declaration) 314 << false; 315 } else if (New->getTemplateSpecializationKind() 316 != TSK_ImplicitInstantiation && 317 New->getTemplateSpecializationKind() != TSK_Undeclared) { 318 // C++ [temp.expr.spec]p21: 319 // Default function arguments shall not be specified in a declaration 320 // or a definition for one of the following explicit specializations: 321 // - the explicit specialization of a function template; 322 // - the explicit specialization of a member function template; 323 // - the explicit specialization of a member function of a class 324 // template where the class template specialization to which the 325 // member function specialization belongs is implicitly 326 // instantiated. 327 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 328 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 329 << New->getDeclName() 330 << NewParam->getDefaultArgRange(); 331 } else if (New->getDeclContext()->isDependentContext()) { 332 // C++ [dcl.fct.default]p6 (DR217): 333 // Default arguments for a member function of a class template shall 334 // be specified on the initial declaration of the member function 335 // within the class template. 336 // 337 // Reading the tea leaves a bit in DR217 and its reference to DR205 338 // leads me to the conclusion that one cannot add default function 339 // arguments for an out-of-line definition of a member function of a 340 // dependent type. 341 int WhichKind = 2; 342 if (CXXRecordDecl *Record 343 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 344 if (Record->getDescribedClassTemplate()) 345 WhichKind = 0; 346 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 347 WhichKind = 1; 348 else 349 WhichKind = 2; 350 } 351 352 Diag(NewParam->getLocation(), 353 diag::err_param_default_argument_member_template_redecl) 354 << WhichKind 355 << NewParam->getDefaultArgRange(); 356 } 357 } 358 } 359 360 if (CheckEquivalentExceptionSpec(Old, New)) 361 Invalid = true; 362 363 return Invalid; 364} 365 366/// CheckCXXDefaultArguments - Verify that the default arguments for a 367/// function declaration are well-formed according to C++ 368/// [dcl.fct.default]. 369void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 370 unsigned NumParams = FD->getNumParams(); 371 unsigned p; 372 373 // Find first parameter with a default argument 374 for (p = 0; p < NumParams; ++p) { 375 ParmVarDecl *Param = FD->getParamDecl(p); 376 if (Param->hasDefaultArg()) 377 break; 378 } 379 380 // C++ [dcl.fct.default]p4: 381 // In a given function declaration, all parameters 382 // subsequent to a parameter with a default argument shall 383 // have default arguments supplied in this or previous 384 // declarations. A default argument shall not be redefined 385 // by a later declaration (not even to the same value). 386 unsigned LastMissingDefaultArg = 0; 387 for (; p < NumParams; ++p) { 388 ParmVarDecl *Param = FD->getParamDecl(p); 389 if (!Param->hasDefaultArg()) { 390 if (Param->isInvalidDecl()) 391 /* We already complained about this parameter. */; 392 else if (Param->getIdentifier()) 393 Diag(Param->getLocation(), 394 diag::err_param_default_argument_missing_name) 395 << Param->getIdentifier(); 396 else 397 Diag(Param->getLocation(), 398 diag::err_param_default_argument_missing); 399 400 LastMissingDefaultArg = p; 401 } 402 } 403 404 if (LastMissingDefaultArg > 0) { 405 // Some default arguments were missing. Clear out all of the 406 // default arguments up to (and including) the last missing 407 // default argument, so that we leave the function parameters 408 // in a semantically valid state. 409 for (p = 0; p <= LastMissingDefaultArg; ++p) { 410 ParmVarDecl *Param = FD->getParamDecl(p); 411 if (Param->hasDefaultArg()) { 412 if (!Param->hasUnparsedDefaultArg()) 413 Param->getDefaultArg()->Destroy(Context); 414 Param->setDefaultArg(0); 415 } 416 } 417 } 418} 419 420/// isCurrentClassName - Determine whether the identifier II is the 421/// name of the class type currently being defined. In the case of 422/// nested classes, this will only return true if II is the name of 423/// the innermost class. 424bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 425 const CXXScopeSpec *SS) { 426 assert(getLangOptions().CPlusPlus && "No class names in C!"); 427 428 CXXRecordDecl *CurDecl; 429 if (SS && SS->isSet() && !SS->isInvalid()) { 430 DeclContext *DC = computeDeclContext(*SS, true); 431 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 432 } else 433 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 434 435 if (CurDecl && CurDecl->getIdentifier()) 436 return &II == CurDecl->getIdentifier(); 437 else 438 return false; 439} 440 441/// \brief Check the validity of a C++ base class specifier. 442/// 443/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 444/// and returns NULL otherwise. 445CXXBaseSpecifier * 446Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 447 SourceRange SpecifierRange, 448 bool Virtual, AccessSpecifier Access, 449 QualType BaseType, 450 SourceLocation BaseLoc) { 451 // C++ [class.union]p1: 452 // A union shall not have base classes. 453 if (Class->isUnion()) { 454 Diag(Class->getLocation(), diag::err_base_clause_on_union) 455 << SpecifierRange; 456 return 0; 457 } 458 459 if (BaseType->isDependentType()) 460 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 461 Class->getTagKind() == RecordDecl::TK_class, 462 Access, BaseType); 463 464 // Base specifiers must be record types. 465 if (!BaseType->isRecordType()) { 466 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 467 return 0; 468 } 469 470 // C++ [class.union]p1: 471 // A union shall not be used as a base class. 472 if (BaseType->isUnionType()) { 473 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 474 return 0; 475 } 476 477 // C++ [class.derived]p2: 478 // The class-name in a base-specifier shall not be an incompletely 479 // defined class. 480 if (RequireCompleteType(BaseLoc, BaseType, 481 PDiag(diag::err_incomplete_base_class) 482 << SpecifierRange)) 483 return 0; 484 485 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 486 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 487 assert(BaseDecl && "Record type has no declaration"); 488 BaseDecl = BaseDecl->getDefinition(); 489 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 490 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 491 assert(CXXBaseDecl && "Base type is not a C++ type"); 492 493 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 494 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 495 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 496 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 497 << BaseType; 498 return 0; 499 } 500 501 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 502 503 // Create the base specifier. 504 // FIXME: Allocate via ASTContext? 505 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 506 Class->getTagKind() == RecordDecl::TK_class, 507 Access, BaseType); 508} 509 510void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 511 const CXXRecordDecl *BaseClass, 512 bool BaseIsVirtual) { 513 // A class with a non-empty base class is not empty. 514 // FIXME: Standard ref? 515 if (!BaseClass->isEmpty()) 516 Class->setEmpty(false); 517 518 // C++ [class.virtual]p1: 519 // A class that [...] inherits a virtual function is called a polymorphic 520 // class. 521 if (BaseClass->isPolymorphic()) 522 Class->setPolymorphic(true); 523 524 // C++ [dcl.init.aggr]p1: 525 // An aggregate is [...] a class with [...] no base classes [...]. 526 Class->setAggregate(false); 527 528 // C++ [class]p4: 529 // A POD-struct is an aggregate class... 530 Class->setPOD(false); 531 532 if (BaseIsVirtual) { 533 // C++ [class.ctor]p5: 534 // A constructor is trivial if its class has no virtual base classes. 535 Class->setHasTrivialConstructor(false); 536 537 // C++ [class.copy]p6: 538 // A copy constructor is trivial if its class has no virtual base classes. 539 Class->setHasTrivialCopyConstructor(false); 540 541 // C++ [class.copy]p11: 542 // A copy assignment operator is trivial if its class has no virtual 543 // base classes. 544 Class->setHasTrivialCopyAssignment(false); 545 546 // C++0x [meta.unary.prop] is_empty: 547 // T is a class type, but not a union type, with ... no virtual base 548 // classes 549 Class->setEmpty(false); 550 } else { 551 // C++ [class.ctor]p5: 552 // A constructor is trivial if all the direct base classes of its 553 // class have trivial constructors. 554 if (!BaseClass->hasTrivialConstructor()) 555 Class->setHasTrivialConstructor(false); 556 557 // C++ [class.copy]p6: 558 // A copy constructor is trivial if all the direct base classes of its 559 // class have trivial copy constructors. 560 if (!BaseClass->hasTrivialCopyConstructor()) 561 Class->setHasTrivialCopyConstructor(false); 562 563 // C++ [class.copy]p11: 564 // A copy assignment operator is trivial if all the direct base classes 565 // of its class have trivial copy assignment operators. 566 if (!BaseClass->hasTrivialCopyAssignment()) 567 Class->setHasTrivialCopyAssignment(false); 568 } 569 570 // C++ [class.ctor]p3: 571 // A destructor is trivial if all the direct base classes of its class 572 // have trivial destructors. 573 if (!BaseClass->hasTrivialDestructor()) 574 Class->setHasTrivialDestructor(false); 575} 576 577/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 578/// one entry in the base class list of a class specifier, for 579/// example: 580/// class foo : public bar, virtual private baz { 581/// 'public bar' and 'virtual private baz' are each base-specifiers. 582Sema::BaseResult 583Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 584 bool Virtual, AccessSpecifier Access, 585 TypeTy *basetype, SourceLocation BaseLoc) { 586 if (!classdecl) 587 return true; 588 589 AdjustDeclIfTemplate(classdecl); 590 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 591 if (!Class) 592 return true; 593 594 QualType BaseType = GetTypeFromParser(basetype); 595 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 596 Virtual, Access, 597 BaseType, BaseLoc)) 598 return BaseSpec; 599 600 return true; 601} 602 603/// \brief Performs the actual work of attaching the given base class 604/// specifiers to a C++ class. 605bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 606 unsigned NumBases) { 607 if (NumBases == 0) 608 return false; 609 610 // Used to keep track of which base types we have already seen, so 611 // that we can properly diagnose redundant direct base types. Note 612 // that the key is always the unqualified canonical type of the base 613 // class. 614 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 615 616 // Copy non-redundant base specifiers into permanent storage. 617 unsigned NumGoodBases = 0; 618 bool Invalid = false; 619 for (unsigned idx = 0; idx < NumBases; ++idx) { 620 QualType NewBaseType 621 = Context.getCanonicalType(Bases[idx]->getType()); 622 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 623 624 if (KnownBaseTypes[NewBaseType]) { 625 // C++ [class.mi]p3: 626 // A class shall not be specified as a direct base class of a 627 // derived class more than once. 628 Diag(Bases[idx]->getSourceRange().getBegin(), 629 diag::err_duplicate_base_class) 630 << KnownBaseTypes[NewBaseType]->getType() 631 << Bases[idx]->getSourceRange(); 632 633 // Delete the duplicate base class specifier; we're going to 634 // overwrite its pointer later. 635 Context.Deallocate(Bases[idx]); 636 637 Invalid = true; 638 } else { 639 // Okay, add this new base class. 640 KnownBaseTypes[NewBaseType] = Bases[idx]; 641 Bases[NumGoodBases++] = Bases[idx]; 642 } 643 } 644 645 // Attach the remaining base class specifiers to the derived class. 646 Class->setBases(Bases, NumGoodBases); 647 648 // Delete the remaining (good) base class specifiers, since their 649 // data has been copied into the CXXRecordDecl. 650 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 651 Context.Deallocate(Bases[idx]); 652 653 return Invalid; 654} 655 656/// ActOnBaseSpecifiers - Attach the given base specifiers to the 657/// class, after checking whether there are any duplicate base 658/// classes. 659void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 660 unsigned NumBases) { 661 if (!ClassDecl || !Bases || !NumBases) 662 return; 663 664 AdjustDeclIfTemplate(ClassDecl); 665 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 666 (CXXBaseSpecifier**)(Bases), NumBases); 667} 668 669static CXXRecordDecl *GetClassForType(QualType T) { 670 if (const RecordType *RT = T->getAs<RecordType>()) 671 return cast<CXXRecordDecl>(RT->getDecl()); 672 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 673 return ICT->getDecl(); 674 else 675 return 0; 676} 677 678/// \brief Determine whether the type \p Derived is a C++ class that is 679/// derived from the type \p Base. 680bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 681 if (!getLangOptions().CPlusPlus) 682 return false; 683 684 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 685 if (!DerivedRD) 686 return false; 687 688 CXXRecordDecl *BaseRD = GetClassForType(Base); 689 if (!BaseRD) 690 return false; 691 692 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 693 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 694} 695 696/// \brief Determine whether the type \p Derived is a C++ class that is 697/// derived from the type \p Base. 698bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 699 if (!getLangOptions().CPlusPlus) 700 return false; 701 702 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 703 if (!DerivedRD) 704 return false; 705 706 CXXRecordDecl *BaseRD = GetClassForType(Base); 707 if (!BaseRD) 708 return false; 709 710 return DerivedRD->isDerivedFrom(BaseRD, Paths); 711} 712 713void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 714 CXXBaseSpecifierArray &BasePathArray) { 715 assert(BasePathArray.empty() && "Base path array must be empty!"); 716 assert(Paths.isRecordingPaths() && "Must record paths!"); 717 718 const CXXBasePath &Path = Paths.front(); 719 720 // We first go backward and check if we have a virtual base. 721 // FIXME: It would be better if CXXBasePath had the base specifier for 722 // the nearest virtual base. 723 unsigned Start = 0; 724 for (unsigned I = Path.size(); I != 0; --I) { 725 if (Path[I - 1].Base->isVirtual()) { 726 Start = I - 1; 727 break; 728 } 729 } 730 731 // Now add all bases. 732 for (unsigned I = Start, E = Path.size(); I != E; ++I) 733 BasePathArray.push_back(Path[I].Base); 734} 735 736/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 737/// conversion (where Derived and Base are class types) is 738/// well-formed, meaning that the conversion is unambiguous (and 739/// that all of the base classes are accessible). Returns true 740/// and emits a diagnostic if the code is ill-formed, returns false 741/// otherwise. Loc is the location where this routine should point to 742/// if there is an error, and Range is the source range to highlight 743/// if there is an error. 744bool 745Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 746 unsigned InaccessibleBaseID, 747 unsigned AmbigiousBaseConvID, 748 SourceLocation Loc, SourceRange Range, 749 DeclarationName Name, 750 CXXBaseSpecifierArray *BasePath) { 751 // First, determine whether the path from Derived to Base is 752 // ambiguous. This is slightly more expensive than checking whether 753 // the Derived to Base conversion exists, because here we need to 754 // explore multiple paths to determine if there is an ambiguity. 755 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 756 /*DetectVirtual=*/false); 757 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 758 assert(DerivationOkay && 759 "Can only be used with a derived-to-base conversion"); 760 (void)DerivationOkay; 761 762 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 763 if (InaccessibleBaseID) { 764 // Check that the base class can be accessed. 765 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 766 InaccessibleBaseID)) { 767 case AR_inaccessible: 768 return true; 769 case AR_accessible: 770 case AR_dependent: 771 case AR_delayed: 772 break; 773 } 774 } 775 776 // Build a base path if necessary. 777 if (BasePath) 778 BuildBasePathArray(Paths, *BasePath); 779 return false; 780 } 781 782 // We know that the derived-to-base conversion is ambiguous, and 783 // we're going to produce a diagnostic. Perform the derived-to-base 784 // search just one more time to compute all of the possible paths so 785 // that we can print them out. This is more expensive than any of 786 // the previous derived-to-base checks we've done, but at this point 787 // performance isn't as much of an issue. 788 Paths.clear(); 789 Paths.setRecordingPaths(true); 790 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 791 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 792 (void)StillOkay; 793 794 // Build up a textual representation of the ambiguous paths, e.g., 795 // D -> B -> A, that will be used to illustrate the ambiguous 796 // conversions in the diagnostic. We only print one of the paths 797 // to each base class subobject. 798 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 799 800 Diag(Loc, AmbigiousBaseConvID) 801 << Derived << Base << PathDisplayStr << Range << Name; 802 return true; 803} 804 805bool 806Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 807 SourceLocation Loc, SourceRange Range, 808 CXXBaseSpecifierArray *BasePath, 809 bool IgnoreAccess) { 810 return CheckDerivedToBaseConversion(Derived, Base, 811 IgnoreAccess ? 0 812 : diag::err_upcast_to_inaccessible_base, 813 diag::err_ambiguous_derived_to_base_conv, 814 Loc, Range, DeclarationName(), 815 BasePath); 816} 817 818 819/// @brief Builds a string representing ambiguous paths from a 820/// specific derived class to different subobjects of the same base 821/// class. 822/// 823/// This function builds a string that can be used in error messages 824/// to show the different paths that one can take through the 825/// inheritance hierarchy to go from the derived class to different 826/// subobjects of a base class. The result looks something like this: 827/// @code 828/// struct D -> struct B -> struct A 829/// struct D -> struct C -> struct A 830/// @endcode 831std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 832 std::string PathDisplayStr; 833 std::set<unsigned> DisplayedPaths; 834 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 835 Path != Paths.end(); ++Path) { 836 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 837 // We haven't displayed a path to this particular base 838 // class subobject yet. 839 PathDisplayStr += "\n "; 840 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 841 for (CXXBasePath::const_iterator Element = Path->begin(); 842 Element != Path->end(); ++Element) 843 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 844 } 845 } 846 847 return PathDisplayStr; 848} 849 850//===----------------------------------------------------------------------===// 851// C++ class member Handling 852//===----------------------------------------------------------------------===// 853 854/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 855/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 856/// bitfield width if there is one and 'InitExpr' specifies the initializer if 857/// any. 858Sema::DeclPtrTy 859Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 860 MultiTemplateParamsArg TemplateParameterLists, 861 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 862 bool Deleted) { 863 const DeclSpec &DS = D.getDeclSpec(); 864 DeclarationName Name = GetNameForDeclarator(D); 865 Expr *BitWidth = static_cast<Expr*>(BW); 866 Expr *Init = static_cast<Expr*>(InitExpr); 867 SourceLocation Loc = D.getIdentifierLoc(); 868 869 bool isFunc = D.isFunctionDeclarator(); 870 871 assert(!DS.isFriendSpecified()); 872 873 // C++ 9.2p6: A member shall not be declared to have automatic storage 874 // duration (auto, register) or with the extern storage-class-specifier. 875 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 876 // data members and cannot be applied to names declared const or static, 877 // and cannot be applied to reference members. 878 switch (DS.getStorageClassSpec()) { 879 case DeclSpec::SCS_unspecified: 880 case DeclSpec::SCS_typedef: 881 case DeclSpec::SCS_static: 882 // FALL THROUGH. 883 break; 884 case DeclSpec::SCS_mutable: 885 if (isFunc) { 886 if (DS.getStorageClassSpecLoc().isValid()) 887 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 888 else 889 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 890 891 // FIXME: It would be nicer if the keyword was ignored only for this 892 // declarator. Otherwise we could get follow-up errors. 893 D.getMutableDeclSpec().ClearStorageClassSpecs(); 894 } else { 895 QualType T = GetTypeForDeclarator(D, S); 896 diag::kind err = static_cast<diag::kind>(0); 897 if (T->isReferenceType()) 898 err = diag::err_mutable_reference; 899 else if (T.isConstQualified()) 900 err = diag::err_mutable_const; 901 if (err != 0) { 902 if (DS.getStorageClassSpecLoc().isValid()) 903 Diag(DS.getStorageClassSpecLoc(), err); 904 else 905 Diag(DS.getThreadSpecLoc(), err); 906 // FIXME: It would be nicer if the keyword was ignored only for this 907 // declarator. Otherwise we could get follow-up errors. 908 D.getMutableDeclSpec().ClearStorageClassSpecs(); 909 } 910 } 911 break; 912 default: 913 if (DS.getStorageClassSpecLoc().isValid()) 914 Diag(DS.getStorageClassSpecLoc(), 915 diag::err_storageclass_invalid_for_member); 916 else 917 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 918 D.getMutableDeclSpec().ClearStorageClassSpecs(); 919 } 920 921 if (!isFunc && 922 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 923 D.getNumTypeObjects() == 0) { 924 // Check also for this case: 925 // 926 // typedef int f(); 927 // f a; 928 // 929 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 930 isFunc = TDType->isFunctionType(); 931 } 932 933 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 934 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 935 !isFunc); 936 937 Decl *Member; 938 if (isInstField) { 939 // FIXME: Check for template parameters! 940 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 941 AS); 942 assert(Member && "HandleField never returns null"); 943 } else { 944 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 945 .getAs<Decl>(); 946 if (!Member) { 947 if (BitWidth) DeleteExpr(BitWidth); 948 return DeclPtrTy(); 949 } 950 951 // Non-instance-fields can't have a bitfield. 952 if (BitWidth) { 953 if (Member->isInvalidDecl()) { 954 // don't emit another diagnostic. 955 } else if (isa<VarDecl>(Member)) { 956 // C++ 9.6p3: A bit-field shall not be a static member. 957 // "static member 'A' cannot be a bit-field" 958 Diag(Loc, diag::err_static_not_bitfield) 959 << Name << BitWidth->getSourceRange(); 960 } else if (isa<TypedefDecl>(Member)) { 961 // "typedef member 'x' cannot be a bit-field" 962 Diag(Loc, diag::err_typedef_not_bitfield) 963 << Name << BitWidth->getSourceRange(); 964 } else { 965 // A function typedef ("typedef int f(); f a;"). 966 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 967 Diag(Loc, diag::err_not_integral_type_bitfield) 968 << Name << cast<ValueDecl>(Member)->getType() 969 << BitWidth->getSourceRange(); 970 } 971 972 DeleteExpr(BitWidth); 973 BitWidth = 0; 974 Member->setInvalidDecl(); 975 } 976 977 Member->setAccess(AS); 978 979 // If we have declared a member function template, set the access of the 980 // templated declaration as well. 981 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 982 FunTmpl->getTemplatedDecl()->setAccess(AS); 983 } 984 985 assert((Name || isInstField) && "No identifier for non-field ?"); 986 987 if (Init) 988 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 989 if (Deleted) // FIXME: Source location is not very good. 990 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 991 992 if (isInstField) { 993 FieldCollector->Add(cast<FieldDecl>(Member)); 994 return DeclPtrTy(); 995 } 996 return DeclPtrTy::make(Member); 997} 998 999/// \brief Find the direct and/or virtual base specifiers that 1000/// correspond to the given base type, for use in base initialization 1001/// within a constructor. 1002static bool FindBaseInitializer(Sema &SemaRef, 1003 CXXRecordDecl *ClassDecl, 1004 QualType BaseType, 1005 const CXXBaseSpecifier *&DirectBaseSpec, 1006 const CXXBaseSpecifier *&VirtualBaseSpec) { 1007 // First, check for a direct base class. 1008 DirectBaseSpec = 0; 1009 for (CXXRecordDecl::base_class_const_iterator Base 1010 = ClassDecl->bases_begin(); 1011 Base != ClassDecl->bases_end(); ++Base) { 1012 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1013 // We found a direct base of this type. That's what we're 1014 // initializing. 1015 DirectBaseSpec = &*Base; 1016 break; 1017 } 1018 } 1019 1020 // Check for a virtual base class. 1021 // FIXME: We might be able to short-circuit this if we know in advance that 1022 // there are no virtual bases. 1023 VirtualBaseSpec = 0; 1024 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1025 // We haven't found a base yet; search the class hierarchy for a 1026 // virtual base class. 1027 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1028 /*DetectVirtual=*/false); 1029 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1030 BaseType, Paths)) { 1031 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1032 Path != Paths.end(); ++Path) { 1033 if (Path->back().Base->isVirtual()) { 1034 VirtualBaseSpec = Path->back().Base; 1035 break; 1036 } 1037 } 1038 } 1039 } 1040 1041 return DirectBaseSpec || VirtualBaseSpec; 1042} 1043 1044/// ActOnMemInitializer - Handle a C++ member initializer. 1045Sema::MemInitResult 1046Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1047 Scope *S, 1048 CXXScopeSpec &SS, 1049 IdentifierInfo *MemberOrBase, 1050 TypeTy *TemplateTypeTy, 1051 SourceLocation IdLoc, 1052 SourceLocation LParenLoc, 1053 ExprTy **Args, unsigned NumArgs, 1054 SourceLocation *CommaLocs, 1055 SourceLocation RParenLoc) { 1056 if (!ConstructorD) 1057 return true; 1058 1059 AdjustDeclIfTemplate(ConstructorD); 1060 1061 CXXConstructorDecl *Constructor 1062 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1063 if (!Constructor) { 1064 // The user wrote a constructor initializer on a function that is 1065 // not a C++ constructor. Ignore the error for now, because we may 1066 // have more member initializers coming; we'll diagnose it just 1067 // once in ActOnMemInitializers. 1068 return true; 1069 } 1070 1071 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1072 1073 // C++ [class.base.init]p2: 1074 // Names in a mem-initializer-id are looked up in the scope of the 1075 // constructor’s class and, if not found in that scope, are looked 1076 // up in the scope containing the constructor’s 1077 // definition. [Note: if the constructor’s class contains a member 1078 // with the same name as a direct or virtual base class of the 1079 // class, a mem-initializer-id naming the member or base class and 1080 // composed of a single identifier refers to the class member. A 1081 // mem-initializer-id for the hidden base class may be specified 1082 // using a qualified name. ] 1083 if (!SS.getScopeRep() && !TemplateTypeTy) { 1084 // Look for a member, first. 1085 FieldDecl *Member = 0; 1086 DeclContext::lookup_result Result 1087 = ClassDecl->lookup(MemberOrBase); 1088 if (Result.first != Result.second) 1089 Member = dyn_cast<FieldDecl>(*Result.first); 1090 1091 // FIXME: Handle members of an anonymous union. 1092 1093 if (Member) 1094 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1095 LParenLoc, RParenLoc); 1096 } 1097 // It didn't name a member, so see if it names a class. 1098 QualType BaseType; 1099 TypeSourceInfo *TInfo = 0; 1100 1101 if (TemplateTypeTy) { 1102 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1103 } else { 1104 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1105 LookupParsedName(R, S, &SS); 1106 1107 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1108 if (!TyD) { 1109 if (R.isAmbiguous()) return true; 1110 1111 // We don't want access-control diagnostics here. 1112 R.suppressDiagnostics(); 1113 1114 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1115 bool NotUnknownSpecialization = false; 1116 DeclContext *DC = computeDeclContext(SS, false); 1117 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1118 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1119 1120 if (!NotUnknownSpecialization) { 1121 // When the scope specifier can refer to a member of an unknown 1122 // specialization, we take it as a type name. 1123 BaseType = CheckTypenameType(ETK_None, 1124 (NestedNameSpecifier *)SS.getScopeRep(), 1125 *MemberOrBase, SS.getRange()); 1126 if (BaseType.isNull()) 1127 return true; 1128 1129 R.clear(); 1130 } 1131 } 1132 1133 // If no results were found, try to correct typos. 1134 if (R.empty() && BaseType.isNull() && 1135 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1136 R.isSingleResult()) { 1137 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1138 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1139 // We have found a non-static data member with a similar 1140 // name to what was typed; complain and initialize that 1141 // member. 1142 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1143 << MemberOrBase << true << R.getLookupName() 1144 << FixItHint::CreateReplacement(R.getNameLoc(), 1145 R.getLookupName().getAsString()); 1146 Diag(Member->getLocation(), diag::note_previous_decl) 1147 << Member->getDeclName(); 1148 1149 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1150 LParenLoc, RParenLoc); 1151 } 1152 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1153 const CXXBaseSpecifier *DirectBaseSpec; 1154 const CXXBaseSpecifier *VirtualBaseSpec; 1155 if (FindBaseInitializer(*this, ClassDecl, 1156 Context.getTypeDeclType(Type), 1157 DirectBaseSpec, VirtualBaseSpec)) { 1158 // We have found a direct or virtual base class with a 1159 // similar name to what was typed; complain and initialize 1160 // that base class. 1161 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1162 << MemberOrBase << false << R.getLookupName() 1163 << FixItHint::CreateReplacement(R.getNameLoc(), 1164 R.getLookupName().getAsString()); 1165 1166 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1167 : VirtualBaseSpec; 1168 Diag(BaseSpec->getSourceRange().getBegin(), 1169 diag::note_base_class_specified_here) 1170 << BaseSpec->getType() 1171 << BaseSpec->getSourceRange(); 1172 1173 TyD = Type; 1174 } 1175 } 1176 } 1177 1178 if (!TyD && BaseType.isNull()) { 1179 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1180 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1181 return true; 1182 } 1183 } 1184 1185 if (BaseType.isNull()) { 1186 BaseType = Context.getTypeDeclType(TyD); 1187 if (SS.isSet()) { 1188 NestedNameSpecifier *Qualifier = 1189 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1190 1191 // FIXME: preserve source range information 1192 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1193 } 1194 } 1195 } 1196 1197 if (!TInfo) 1198 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1199 1200 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1201 LParenLoc, RParenLoc, ClassDecl); 1202} 1203 1204/// Checks an initializer expression for use of uninitialized fields, such as 1205/// containing the field that is being initialized. Returns true if there is an 1206/// uninitialized field was used an updates the SourceLocation parameter; false 1207/// otherwise. 1208static bool InitExprContainsUninitializedFields(const Stmt* S, 1209 const FieldDecl* LhsField, 1210 SourceLocation* L) { 1211 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1212 if (ME) { 1213 const NamedDecl* RhsField = ME->getMemberDecl(); 1214 if (RhsField == LhsField) { 1215 // Initializing a field with itself. Throw a warning. 1216 // But wait; there are exceptions! 1217 // Exception #1: The field may not belong to this record. 1218 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1219 const Expr* base = ME->getBase(); 1220 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1221 // Even though the field matches, it does not belong to this record. 1222 return false; 1223 } 1224 // None of the exceptions triggered; return true to indicate an 1225 // uninitialized field was used. 1226 *L = ME->getMemberLoc(); 1227 return true; 1228 } 1229 } 1230 bool found = false; 1231 for (Stmt::const_child_iterator it = S->child_begin(); 1232 it != S->child_end() && found == false; 1233 ++it) { 1234 if (isa<CallExpr>(S)) { 1235 // Do not descend into function calls or constructors, as the use 1236 // of an uninitialized field may be valid. One would have to inspect 1237 // the contents of the function/ctor to determine if it is safe or not. 1238 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1239 // may be safe, depending on what the function/ctor does. 1240 continue; 1241 } 1242 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1243 } 1244 return found; 1245} 1246 1247Sema::MemInitResult 1248Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1249 unsigned NumArgs, SourceLocation IdLoc, 1250 SourceLocation LParenLoc, 1251 SourceLocation RParenLoc) { 1252 // Diagnose value-uses of fields to initialize themselves, e.g. 1253 // foo(foo) 1254 // where foo is not also a parameter to the constructor. 1255 // TODO: implement -Wuninitialized and fold this into that framework. 1256 for (unsigned i = 0; i < NumArgs; ++i) { 1257 SourceLocation L; 1258 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1259 // FIXME: Return true in the case when other fields are used before being 1260 // uninitialized. For example, let this field be the i'th field. When 1261 // initializing the i'th field, throw a warning if any of the >= i'th 1262 // fields are used, as they are not yet initialized. 1263 // Right now we are only handling the case where the i'th field uses 1264 // itself in its initializer. 1265 Diag(L, diag::warn_field_is_uninit); 1266 } 1267 } 1268 1269 bool HasDependentArg = false; 1270 for (unsigned i = 0; i < NumArgs; i++) 1271 HasDependentArg |= Args[i]->isTypeDependent(); 1272 1273 QualType FieldType = Member->getType(); 1274 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1275 FieldType = Array->getElementType(); 1276 if (FieldType->isDependentType() || HasDependentArg) { 1277 // Can't check initialization for a member of dependent type or when 1278 // any of the arguments are type-dependent expressions. 1279 OwningExprResult Init 1280 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1281 RParenLoc)); 1282 1283 // Erase any temporaries within this evaluation context; we're not 1284 // going to track them in the AST, since we'll be rebuilding the 1285 // ASTs during template instantiation. 1286 ExprTemporaries.erase( 1287 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1288 ExprTemporaries.end()); 1289 1290 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1291 LParenLoc, 1292 Init.takeAs<Expr>(), 1293 RParenLoc); 1294 1295 } 1296 1297 if (Member->isInvalidDecl()) 1298 return true; 1299 1300 // Initialize the member. 1301 InitializedEntity MemberEntity = 1302 InitializedEntity::InitializeMember(Member, 0); 1303 InitializationKind Kind = 1304 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1305 1306 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1307 1308 OwningExprResult MemberInit = 1309 InitSeq.Perform(*this, MemberEntity, Kind, 1310 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1311 if (MemberInit.isInvalid()) 1312 return true; 1313 1314 // C++0x [class.base.init]p7: 1315 // The initialization of each base and member constitutes a 1316 // full-expression. 1317 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1318 if (MemberInit.isInvalid()) 1319 return true; 1320 1321 // If we are in a dependent context, template instantiation will 1322 // perform this type-checking again. Just save the arguments that we 1323 // received in a ParenListExpr. 1324 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1325 // of the information that we have about the member 1326 // initializer. However, deconstructing the ASTs is a dicey process, 1327 // and this approach is far more likely to get the corner cases right. 1328 if (CurContext->isDependentContext()) { 1329 // Bump the reference count of all of the arguments. 1330 for (unsigned I = 0; I != NumArgs; ++I) 1331 Args[I]->Retain(); 1332 1333 OwningExprResult Init 1334 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1335 RParenLoc)); 1336 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1337 LParenLoc, 1338 Init.takeAs<Expr>(), 1339 RParenLoc); 1340 } 1341 1342 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1343 LParenLoc, 1344 MemberInit.takeAs<Expr>(), 1345 RParenLoc); 1346} 1347 1348Sema::MemInitResult 1349Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1350 Expr **Args, unsigned NumArgs, 1351 SourceLocation LParenLoc, SourceLocation RParenLoc, 1352 CXXRecordDecl *ClassDecl) { 1353 bool HasDependentArg = false; 1354 for (unsigned i = 0; i < NumArgs; i++) 1355 HasDependentArg |= Args[i]->isTypeDependent(); 1356 1357 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1358 if (BaseType->isDependentType() || HasDependentArg) { 1359 // Can't check initialization for a base of dependent type or when 1360 // any of the arguments are type-dependent expressions. 1361 OwningExprResult BaseInit 1362 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1363 RParenLoc)); 1364 1365 // Erase any temporaries within this evaluation context; we're not 1366 // going to track them in the AST, since we'll be rebuilding the 1367 // ASTs during template instantiation. 1368 ExprTemporaries.erase( 1369 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1370 ExprTemporaries.end()); 1371 1372 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1373 /*IsVirtual=*/false, 1374 LParenLoc, 1375 BaseInit.takeAs<Expr>(), 1376 RParenLoc); 1377 } 1378 1379 if (!BaseType->isRecordType()) 1380 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1381 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1382 1383 // C++ [class.base.init]p2: 1384 // [...] Unless the mem-initializer-id names a nonstatic data 1385 // member of the constructor’s class or a direct or virtual base 1386 // of that class, the mem-initializer is ill-formed. A 1387 // mem-initializer-list can initialize a base class using any 1388 // name that denotes that base class type. 1389 1390 // Check for direct and virtual base classes. 1391 const CXXBaseSpecifier *DirectBaseSpec = 0; 1392 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1393 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1394 VirtualBaseSpec); 1395 1396 // C++ [base.class.init]p2: 1397 // If a mem-initializer-id is ambiguous because it designates both 1398 // a direct non-virtual base class and an inherited virtual base 1399 // class, the mem-initializer is ill-formed. 1400 if (DirectBaseSpec && VirtualBaseSpec) 1401 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1402 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1403 // C++ [base.class.init]p2: 1404 // Unless the mem-initializer-id names a nonstatic data membeer of the 1405 // constructor's class ot a direst or virtual base of that class, the 1406 // mem-initializer is ill-formed. 1407 if (!DirectBaseSpec && !VirtualBaseSpec) 1408 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1409 << BaseType << ClassDecl->getNameAsCString() 1410 << BaseTInfo->getTypeLoc().getSourceRange(); 1411 1412 CXXBaseSpecifier *BaseSpec 1413 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1414 if (!BaseSpec) 1415 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1416 1417 // Initialize the base. 1418 InitializedEntity BaseEntity = 1419 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1420 InitializationKind Kind = 1421 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1422 1423 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1424 1425 OwningExprResult BaseInit = 1426 InitSeq.Perform(*this, BaseEntity, Kind, 1427 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1428 if (BaseInit.isInvalid()) 1429 return true; 1430 1431 // C++0x [class.base.init]p7: 1432 // The initialization of each base and member constitutes a 1433 // full-expression. 1434 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1435 if (BaseInit.isInvalid()) 1436 return true; 1437 1438 // If we are in a dependent context, template instantiation will 1439 // perform this type-checking again. Just save the arguments that we 1440 // received in a ParenListExpr. 1441 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1442 // of the information that we have about the base 1443 // initializer. However, deconstructing the ASTs is a dicey process, 1444 // and this approach is far more likely to get the corner cases right. 1445 if (CurContext->isDependentContext()) { 1446 // Bump the reference count of all of the arguments. 1447 for (unsigned I = 0; I != NumArgs; ++I) 1448 Args[I]->Retain(); 1449 1450 OwningExprResult Init 1451 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1452 RParenLoc)); 1453 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1454 BaseSpec->isVirtual(), 1455 LParenLoc, 1456 Init.takeAs<Expr>(), 1457 RParenLoc); 1458 } 1459 1460 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1461 BaseSpec->isVirtual(), 1462 LParenLoc, 1463 BaseInit.takeAs<Expr>(), 1464 RParenLoc); 1465} 1466 1467/// ImplicitInitializerKind - How an implicit base or member initializer should 1468/// initialize its base or member. 1469enum ImplicitInitializerKind { 1470 IIK_Default, 1471 IIK_Copy, 1472 IIK_Move 1473}; 1474 1475static bool 1476BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1477 ImplicitInitializerKind ImplicitInitKind, 1478 CXXBaseSpecifier *BaseSpec, 1479 bool IsInheritedVirtualBase, 1480 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1481 InitializedEntity InitEntity 1482 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1483 IsInheritedVirtualBase); 1484 1485 Sema::OwningExprResult BaseInit(SemaRef); 1486 1487 switch (ImplicitInitKind) { 1488 case IIK_Default: { 1489 InitializationKind InitKind 1490 = InitializationKind::CreateDefault(Constructor->getLocation()); 1491 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1492 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1493 Sema::MultiExprArg(SemaRef, 0, 0)); 1494 break; 1495 } 1496 1497 case IIK_Copy: { 1498 ParmVarDecl *Param = Constructor->getParamDecl(0); 1499 QualType ParamType = Param->getType().getNonReferenceType(); 1500 1501 Expr *CopyCtorArg = 1502 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1503 SourceLocation(), ParamType, 0); 1504 1505 // Cast to the base class to avoid ambiguities. 1506 SemaRef.ImpCastExprToType(CopyCtorArg, BaseSpec->getType(), 1507 CastExpr::CK_UncheckedDerivedToBase, 1508 /*isLvalue=*/true, 1509 CXXBaseSpecifierArray(BaseSpec)); 1510 1511 InitializationKind InitKind 1512 = InitializationKind::CreateDirect(Constructor->getLocation(), 1513 SourceLocation(), SourceLocation()); 1514 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1515 &CopyCtorArg, 1); 1516 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1517 Sema::MultiExprArg(SemaRef, 1518 (void**)&CopyCtorArg, 1)); 1519 break; 1520 } 1521 1522 case IIK_Move: 1523 assert(false && "Unhandled initializer kind!"); 1524 } 1525 1526 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1527 if (BaseInit.isInvalid()) 1528 return true; 1529 1530 CXXBaseInit = 1531 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1532 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1533 SourceLocation()), 1534 BaseSpec->isVirtual(), 1535 SourceLocation(), 1536 BaseInit.takeAs<Expr>(), 1537 SourceLocation()); 1538 1539 return false; 1540} 1541 1542static bool 1543BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1544 ImplicitInitializerKind ImplicitInitKind, 1545 FieldDecl *Field, 1546 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1547 if (ImplicitInitKind == IIK_Copy) { 1548 // FIXME: We shouldn't return early here. The reason we do it is that 1549 // we don't handle copying arrays. 1550 CXXMemberInit = 0; 1551 return false; 1552 1553 ParmVarDecl *Param = Constructor->getParamDecl(0); 1554 QualType ParamType = Param->getType().getNonReferenceType(); 1555 1556 Expr *MemberExprBase = 1557 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1558 SourceLocation(), ParamType, 0); 1559 1560 1561 Expr *CopyCtorArg = 1562 MemberExpr::Create(SemaRef.Context, MemberExprBase, /*IsArrow=*/false, 1563 0, SourceRange(), Field, 1564 DeclAccessPair::make(Field, Field->getAccess()), 1565 SourceLocation(), 0, 1566 Field->getType().getNonReferenceType()); 1567 1568 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1569 InitializationKind InitKind = 1570 InitializationKind::CreateDirect(Constructor->getLocation(), 1571 SourceLocation(), SourceLocation()); 1572 1573 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1574 &CopyCtorArg, 1); 1575 1576 Sema::OwningExprResult MemberInit = 1577 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1578 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArg, 1), 0); 1579 if (MemberInit.isInvalid()) 1580 return true; 1581 1582 CXXMemberInit = 0; 1583 return false; 1584 } 1585 1586 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1587 1588 QualType FieldBaseElementType = 1589 SemaRef.Context.getBaseElementType(Field->getType()); 1590 1591 if (FieldBaseElementType->isRecordType()) { 1592 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1593 InitializationKind InitKind = 1594 InitializationKind::CreateDefault(Constructor->getLocation()); 1595 1596 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1597 Sema::OwningExprResult MemberInit = 1598 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1599 Sema::MultiExprArg(SemaRef, 0, 0)); 1600 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1601 if (MemberInit.isInvalid()) 1602 return true; 1603 1604 CXXMemberInit = 1605 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1606 Field, SourceLocation(), 1607 SourceLocation(), 1608 MemberInit.takeAs<Expr>(), 1609 SourceLocation()); 1610 return false; 1611 } 1612 1613 if (FieldBaseElementType->isReferenceType()) { 1614 SemaRef.Diag(Constructor->getLocation(), 1615 diag::err_uninitialized_member_in_ctor) 1616 << (int)Constructor->isImplicit() 1617 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1618 << 0 << Field->getDeclName(); 1619 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1620 return true; 1621 } 1622 1623 if (FieldBaseElementType.isConstQualified()) { 1624 SemaRef.Diag(Constructor->getLocation(), 1625 diag::err_uninitialized_member_in_ctor) 1626 << (int)Constructor->isImplicit() 1627 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1628 << 1 << Field->getDeclName(); 1629 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1630 return true; 1631 } 1632 1633 // Nothing to initialize. 1634 CXXMemberInit = 0; 1635 return false; 1636} 1637 1638bool 1639Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1640 CXXBaseOrMemberInitializer **Initializers, 1641 unsigned NumInitializers, 1642 bool AnyErrors) { 1643 if (Constructor->getDeclContext()->isDependentContext()) { 1644 // Just store the initializers as written, they will be checked during 1645 // instantiation. 1646 if (NumInitializers > 0) { 1647 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1648 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1649 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1650 memcpy(baseOrMemberInitializers, Initializers, 1651 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1652 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1653 } 1654 1655 return false; 1656 } 1657 1658 ImplicitInitializerKind ImplicitInitKind = IIK_Default; 1659 1660 // FIXME: Handle implicit move constructors. 1661 if (Constructor->isImplicit() && Constructor->isCopyConstructor()) 1662 ImplicitInitKind = IIK_Copy; 1663 1664 // We need to build the initializer AST according to order of construction 1665 // and not what user specified in the Initializers list. 1666 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1667 if (!ClassDecl) 1668 return true; 1669 1670 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1671 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1672 bool HadError = false; 1673 1674 for (unsigned i = 0; i < NumInitializers; i++) { 1675 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1676 1677 if (Member->isBaseInitializer()) 1678 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1679 else 1680 AllBaseFields[Member->getMember()] = Member; 1681 } 1682 1683 // Keep track of the direct virtual bases. 1684 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1685 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1686 E = ClassDecl->bases_end(); I != E; ++I) { 1687 if (I->isVirtual()) 1688 DirectVBases.insert(I); 1689 } 1690 1691 // Push virtual bases before others. 1692 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1693 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1694 1695 if (CXXBaseOrMemberInitializer *Value 1696 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1697 AllToInit.push_back(Value); 1698 } else if (!AnyErrors) { 1699 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1700 CXXBaseOrMemberInitializer *CXXBaseInit; 1701 if (BuildImplicitBaseInitializer(*this, Constructor, ImplicitInitKind, 1702 VBase, IsInheritedVirtualBase, 1703 CXXBaseInit)) { 1704 HadError = true; 1705 continue; 1706 } 1707 1708 AllToInit.push_back(CXXBaseInit); 1709 } 1710 } 1711 1712 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1713 E = ClassDecl->bases_end(); Base != E; ++Base) { 1714 // Virtuals are in the virtual base list and already constructed. 1715 if (Base->isVirtual()) 1716 continue; 1717 1718 if (CXXBaseOrMemberInitializer *Value 1719 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1720 AllToInit.push_back(Value); 1721 } else if (!AnyErrors) { 1722 CXXBaseOrMemberInitializer *CXXBaseInit; 1723 if (BuildImplicitBaseInitializer(*this, Constructor, ImplicitInitKind, 1724 Base, /*IsInheritedVirtualBase=*/false, 1725 CXXBaseInit)) { 1726 HadError = true; 1727 continue; 1728 } 1729 1730 AllToInit.push_back(CXXBaseInit); 1731 } 1732 } 1733 1734 // non-static data members. 1735 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1736 E = ClassDecl->field_end(); Field != E; ++Field) { 1737 if ((*Field)->isAnonymousStructOrUnion()) { 1738 if (const RecordType *FieldClassType = 1739 Field->getType()->getAs<RecordType>()) { 1740 CXXRecordDecl *FieldClassDecl 1741 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1742 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1743 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1744 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1745 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1746 // set to the anonymous union data member used in the initializer 1747 // list. 1748 Value->setMember(*Field); 1749 Value->setAnonUnionMember(*FA); 1750 AllToInit.push_back(Value); 1751 break; 1752 } 1753 } 1754 } 1755 continue; 1756 } 1757 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1758 AllToInit.push_back(Value); 1759 continue; 1760 } 1761 1762 if (AnyErrors) 1763 continue; 1764 1765 CXXBaseOrMemberInitializer *Member; 1766 if (BuildImplicitMemberInitializer(*this, Constructor, ImplicitInitKind, 1767 *Field, Member)) { 1768 HadError = true; 1769 continue; 1770 } 1771 1772 // If the member doesn't need to be initialized, it will be null. 1773 if (Member) 1774 AllToInit.push_back(Member); 1775 } 1776 1777 NumInitializers = AllToInit.size(); 1778 if (NumInitializers > 0) { 1779 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1780 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1781 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1782 memcpy(baseOrMemberInitializers, AllToInit.data(), 1783 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1784 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1785 1786 // Constructors implicitly reference the base and member 1787 // destructors. 1788 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1789 Constructor->getParent()); 1790 } 1791 1792 return HadError; 1793} 1794 1795static void *GetKeyForTopLevelField(FieldDecl *Field) { 1796 // For anonymous unions, use the class declaration as the key. 1797 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1798 if (RT->getDecl()->isAnonymousStructOrUnion()) 1799 return static_cast<void *>(RT->getDecl()); 1800 } 1801 return static_cast<void *>(Field); 1802} 1803 1804static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1805 return Context.getCanonicalType(BaseType).getTypePtr(); 1806} 1807 1808static void *GetKeyForMember(ASTContext &Context, 1809 CXXBaseOrMemberInitializer *Member, 1810 bool MemberMaybeAnon = false) { 1811 if (!Member->isMemberInitializer()) 1812 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1813 1814 // For fields injected into the class via declaration of an anonymous union, 1815 // use its anonymous union class declaration as the unique key. 1816 FieldDecl *Field = Member->getMember(); 1817 1818 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1819 // data member of the class. Data member used in the initializer list is 1820 // in AnonUnionMember field. 1821 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1822 Field = Member->getAnonUnionMember(); 1823 1824 // If the field is a member of an anonymous struct or union, our key 1825 // is the anonymous record decl that's a direct child of the class. 1826 RecordDecl *RD = Field->getParent(); 1827 if (RD->isAnonymousStructOrUnion()) { 1828 while (true) { 1829 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1830 if (Parent->isAnonymousStructOrUnion()) 1831 RD = Parent; 1832 else 1833 break; 1834 } 1835 1836 return static_cast<void *>(RD); 1837 } 1838 1839 return static_cast<void *>(Field); 1840} 1841 1842static void 1843DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1844 const CXXConstructorDecl *Constructor, 1845 CXXBaseOrMemberInitializer **Inits, 1846 unsigned NumInits) { 1847 if (Constructor->getDeclContext()->isDependentContext()) 1848 return; 1849 1850 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1851 == Diagnostic::Ignored) 1852 return; 1853 1854 // Build the list of bases and members in the order that they'll 1855 // actually be initialized. The explicit initializers should be in 1856 // this same order but may be missing things. 1857 llvm::SmallVector<const void*, 32> IdealInitKeys; 1858 1859 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1860 1861 // 1. Virtual bases. 1862 for (CXXRecordDecl::base_class_const_iterator VBase = 1863 ClassDecl->vbases_begin(), 1864 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1865 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 1866 1867 // 2. Non-virtual bases. 1868 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 1869 E = ClassDecl->bases_end(); Base != E; ++Base) { 1870 if (Base->isVirtual()) 1871 continue; 1872 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 1873 } 1874 1875 // 3. Direct fields. 1876 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1877 E = ClassDecl->field_end(); Field != E; ++Field) 1878 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 1879 1880 unsigned NumIdealInits = IdealInitKeys.size(); 1881 unsigned IdealIndex = 0; 1882 1883 CXXBaseOrMemberInitializer *PrevInit = 0; 1884 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 1885 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 1886 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 1887 1888 // Scan forward to try to find this initializer in the idealized 1889 // initializers list. 1890 for (; IdealIndex != NumIdealInits; ++IdealIndex) 1891 if (InitKey == IdealInitKeys[IdealIndex]) 1892 break; 1893 1894 // If we didn't find this initializer, it must be because we 1895 // scanned past it on a previous iteration. That can only 1896 // happen if we're out of order; emit a warning. 1897 if (IdealIndex == NumIdealInits) { 1898 assert(PrevInit && "initializer not found in initializer list"); 1899 1900 Sema::SemaDiagnosticBuilder D = 1901 SemaRef.Diag(PrevInit->getSourceLocation(), 1902 diag::warn_initializer_out_of_order); 1903 1904 if (PrevInit->isMemberInitializer()) 1905 D << 0 << PrevInit->getMember()->getDeclName(); 1906 else 1907 D << 1 << PrevInit->getBaseClassInfo()->getType(); 1908 1909 if (Init->isMemberInitializer()) 1910 D << 0 << Init->getMember()->getDeclName(); 1911 else 1912 D << 1 << Init->getBaseClassInfo()->getType(); 1913 1914 // Move back to the initializer's location in the ideal list. 1915 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 1916 if (InitKey == IdealInitKeys[IdealIndex]) 1917 break; 1918 1919 assert(IdealIndex != NumIdealInits && 1920 "initializer not found in initializer list"); 1921 } 1922 1923 PrevInit = Init; 1924 } 1925} 1926 1927namespace { 1928bool CheckRedundantInit(Sema &S, 1929 CXXBaseOrMemberInitializer *Init, 1930 CXXBaseOrMemberInitializer *&PrevInit) { 1931 if (!PrevInit) { 1932 PrevInit = Init; 1933 return false; 1934 } 1935 1936 if (FieldDecl *Field = Init->getMember()) 1937 S.Diag(Init->getSourceLocation(), 1938 diag::err_multiple_mem_initialization) 1939 << Field->getDeclName() 1940 << Init->getSourceRange(); 1941 else { 1942 Type *BaseClass = Init->getBaseClass(); 1943 assert(BaseClass && "neither field nor base"); 1944 S.Diag(Init->getSourceLocation(), 1945 diag::err_multiple_base_initialization) 1946 << QualType(BaseClass, 0) 1947 << Init->getSourceRange(); 1948 } 1949 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 1950 << 0 << PrevInit->getSourceRange(); 1951 1952 return true; 1953} 1954 1955typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 1956typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 1957 1958bool CheckRedundantUnionInit(Sema &S, 1959 CXXBaseOrMemberInitializer *Init, 1960 RedundantUnionMap &Unions) { 1961 FieldDecl *Field = Init->getMember(); 1962 RecordDecl *Parent = Field->getParent(); 1963 if (!Parent->isAnonymousStructOrUnion()) 1964 return false; 1965 1966 NamedDecl *Child = Field; 1967 do { 1968 if (Parent->isUnion()) { 1969 UnionEntry &En = Unions[Parent]; 1970 if (En.first && En.first != Child) { 1971 S.Diag(Init->getSourceLocation(), 1972 diag::err_multiple_mem_union_initialization) 1973 << Field->getDeclName() 1974 << Init->getSourceRange(); 1975 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 1976 << 0 << En.second->getSourceRange(); 1977 return true; 1978 } else if (!En.first) { 1979 En.first = Child; 1980 En.second = Init; 1981 } 1982 } 1983 1984 Child = Parent; 1985 Parent = cast<RecordDecl>(Parent->getDeclContext()); 1986 } while (Parent->isAnonymousStructOrUnion()); 1987 1988 return false; 1989} 1990} 1991 1992/// ActOnMemInitializers - Handle the member initializers for a constructor. 1993void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1994 SourceLocation ColonLoc, 1995 MemInitTy **meminits, unsigned NumMemInits, 1996 bool AnyErrors) { 1997 if (!ConstructorDecl) 1998 return; 1999 2000 AdjustDeclIfTemplate(ConstructorDecl); 2001 2002 CXXConstructorDecl *Constructor 2003 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 2004 2005 if (!Constructor) { 2006 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2007 return; 2008 } 2009 2010 CXXBaseOrMemberInitializer **MemInits = 2011 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2012 2013 // Mapping for the duplicate initializers check. 2014 // For member initializers, this is keyed with a FieldDecl*. 2015 // For base initializers, this is keyed with a Type*. 2016 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2017 2018 // Mapping for the inconsistent anonymous-union initializers check. 2019 RedundantUnionMap MemberUnions; 2020 2021 bool HadError = false; 2022 for (unsigned i = 0; i < NumMemInits; i++) { 2023 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2024 2025 if (Init->isMemberInitializer()) { 2026 FieldDecl *Field = Init->getMember(); 2027 if (CheckRedundantInit(*this, Init, Members[Field]) || 2028 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2029 HadError = true; 2030 } else { 2031 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2032 if (CheckRedundantInit(*this, Init, Members[Key])) 2033 HadError = true; 2034 } 2035 } 2036 2037 if (HadError) 2038 return; 2039 2040 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2041 2042 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2043} 2044 2045void 2046Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2047 CXXRecordDecl *ClassDecl) { 2048 // Ignore dependent contexts. 2049 if (ClassDecl->isDependentContext()) 2050 return; 2051 2052 // FIXME: all the access-control diagnostics are positioned on the 2053 // field/base declaration. That's probably good; that said, the 2054 // user might reasonably want to know why the destructor is being 2055 // emitted, and we currently don't say. 2056 2057 // Non-static data members. 2058 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2059 E = ClassDecl->field_end(); I != E; ++I) { 2060 FieldDecl *Field = *I; 2061 2062 QualType FieldType = Context.getBaseElementType(Field->getType()); 2063 2064 const RecordType* RT = FieldType->getAs<RecordType>(); 2065 if (!RT) 2066 continue; 2067 2068 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2069 if (FieldClassDecl->hasTrivialDestructor()) 2070 continue; 2071 2072 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 2073 CheckDestructorAccess(Field->getLocation(), Dtor, 2074 PDiag(diag::err_access_dtor_field) 2075 << Field->getDeclName() 2076 << FieldType); 2077 2078 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2079 } 2080 2081 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2082 2083 // Bases. 2084 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2085 E = ClassDecl->bases_end(); Base != E; ++Base) { 2086 // Bases are always records in a well-formed non-dependent class. 2087 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2088 2089 // Remember direct virtual bases. 2090 if (Base->isVirtual()) 2091 DirectVirtualBases.insert(RT); 2092 2093 // Ignore trivial destructors. 2094 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2095 if (BaseClassDecl->hasTrivialDestructor()) 2096 continue; 2097 2098 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2099 2100 // FIXME: caret should be on the start of the class name 2101 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2102 PDiag(diag::err_access_dtor_base) 2103 << Base->getType() 2104 << Base->getSourceRange()); 2105 2106 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2107 } 2108 2109 // Virtual bases. 2110 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2111 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2112 2113 // Bases are always records in a well-formed non-dependent class. 2114 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2115 2116 // Ignore direct virtual bases. 2117 if (DirectVirtualBases.count(RT)) 2118 continue; 2119 2120 // Ignore trivial destructors. 2121 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2122 if (BaseClassDecl->hasTrivialDestructor()) 2123 continue; 2124 2125 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2126 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2127 PDiag(diag::err_access_dtor_vbase) 2128 << VBase->getType()); 2129 2130 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2131 } 2132} 2133 2134void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2135 if (!CDtorDecl) 2136 return; 2137 2138 if (CXXConstructorDecl *Constructor 2139 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2140 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2141} 2142 2143bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2144 unsigned DiagID, AbstractDiagSelID SelID, 2145 const CXXRecordDecl *CurrentRD) { 2146 if (SelID == -1) 2147 return RequireNonAbstractType(Loc, T, 2148 PDiag(DiagID), CurrentRD); 2149 else 2150 return RequireNonAbstractType(Loc, T, 2151 PDiag(DiagID) << SelID, CurrentRD); 2152} 2153 2154bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2155 const PartialDiagnostic &PD, 2156 const CXXRecordDecl *CurrentRD) { 2157 if (!getLangOptions().CPlusPlus) 2158 return false; 2159 2160 if (const ArrayType *AT = Context.getAsArrayType(T)) 2161 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2162 CurrentRD); 2163 2164 if (const PointerType *PT = T->getAs<PointerType>()) { 2165 // Find the innermost pointer type. 2166 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2167 PT = T; 2168 2169 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2170 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2171 } 2172 2173 const RecordType *RT = T->getAs<RecordType>(); 2174 if (!RT) 2175 return false; 2176 2177 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2178 2179 if (CurrentRD && CurrentRD != RD) 2180 return false; 2181 2182 // FIXME: is this reasonable? It matches current behavior, but.... 2183 if (!RD->getDefinition()) 2184 return false; 2185 2186 if (!RD->isAbstract()) 2187 return false; 2188 2189 Diag(Loc, PD) << RD->getDeclName(); 2190 2191 // Check if we've already emitted the list of pure virtual functions for this 2192 // class. 2193 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2194 return true; 2195 2196 CXXFinalOverriderMap FinalOverriders; 2197 RD->getFinalOverriders(FinalOverriders); 2198 2199 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2200 MEnd = FinalOverriders.end(); 2201 M != MEnd; 2202 ++M) { 2203 for (OverridingMethods::iterator SO = M->second.begin(), 2204 SOEnd = M->second.end(); 2205 SO != SOEnd; ++SO) { 2206 // C++ [class.abstract]p4: 2207 // A class is abstract if it contains or inherits at least one 2208 // pure virtual function for which the final overrider is pure 2209 // virtual. 2210 2211 // 2212 if (SO->second.size() != 1) 2213 continue; 2214 2215 if (!SO->second.front().Method->isPure()) 2216 continue; 2217 2218 Diag(SO->second.front().Method->getLocation(), 2219 diag::note_pure_virtual_function) 2220 << SO->second.front().Method->getDeclName(); 2221 } 2222 } 2223 2224 if (!PureVirtualClassDiagSet) 2225 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2226 PureVirtualClassDiagSet->insert(RD); 2227 2228 return true; 2229} 2230 2231namespace { 2232 class AbstractClassUsageDiagnoser 2233 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2234 Sema &SemaRef; 2235 CXXRecordDecl *AbstractClass; 2236 2237 bool VisitDeclContext(const DeclContext *DC) { 2238 bool Invalid = false; 2239 2240 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2241 E = DC->decls_end(); I != E; ++I) 2242 Invalid |= Visit(*I); 2243 2244 return Invalid; 2245 } 2246 2247 public: 2248 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2249 : SemaRef(SemaRef), AbstractClass(ac) { 2250 Visit(SemaRef.Context.getTranslationUnitDecl()); 2251 } 2252 2253 bool VisitFunctionDecl(const FunctionDecl *FD) { 2254 if (FD->isThisDeclarationADefinition()) { 2255 // No need to do the check if we're in a definition, because it requires 2256 // that the return/param types are complete. 2257 // because that requires 2258 return VisitDeclContext(FD); 2259 } 2260 2261 // Check the return type. 2262 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2263 bool Invalid = 2264 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2265 diag::err_abstract_type_in_decl, 2266 Sema::AbstractReturnType, 2267 AbstractClass); 2268 2269 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2270 E = FD->param_end(); I != E; ++I) { 2271 const ParmVarDecl *VD = *I; 2272 Invalid |= 2273 SemaRef.RequireNonAbstractType(VD->getLocation(), 2274 VD->getOriginalType(), 2275 diag::err_abstract_type_in_decl, 2276 Sema::AbstractParamType, 2277 AbstractClass); 2278 } 2279 2280 return Invalid; 2281 } 2282 2283 bool VisitDecl(const Decl* D) { 2284 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2285 return VisitDeclContext(DC); 2286 2287 return false; 2288 } 2289 }; 2290} 2291 2292/// \brief Perform semantic checks on a class definition that has been 2293/// completing, introducing implicitly-declared members, checking for 2294/// abstract types, etc. 2295void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) { 2296 if (!Record || Record->isInvalidDecl()) 2297 return; 2298 2299 if (!Record->isDependentType()) 2300 AddImplicitlyDeclaredMembersToClass(S, Record); 2301 2302 if (Record->isInvalidDecl()) 2303 return; 2304 2305 // Set access bits correctly on the directly-declared conversions. 2306 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2307 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2308 Convs->setAccess(I, (*I)->getAccess()); 2309 2310 // Determine whether we need to check for final overriders. We do 2311 // this either when there are virtual base classes (in which case we 2312 // may end up finding multiple final overriders for a given virtual 2313 // function) or any of the base classes is abstract (in which case 2314 // we might detect that this class is abstract). 2315 bool CheckFinalOverriders = false; 2316 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2317 !Record->isDependentType()) { 2318 if (Record->getNumVBases()) 2319 CheckFinalOverriders = true; 2320 else if (!Record->isAbstract()) { 2321 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2322 BEnd = Record->bases_end(); 2323 B != BEnd; ++B) { 2324 CXXRecordDecl *BaseDecl 2325 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2326 if (BaseDecl->isAbstract()) { 2327 CheckFinalOverriders = true; 2328 break; 2329 } 2330 } 2331 } 2332 } 2333 2334 if (CheckFinalOverriders) { 2335 CXXFinalOverriderMap FinalOverriders; 2336 Record->getFinalOverriders(FinalOverriders); 2337 2338 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2339 MEnd = FinalOverriders.end(); 2340 M != MEnd; ++M) { 2341 for (OverridingMethods::iterator SO = M->second.begin(), 2342 SOEnd = M->second.end(); 2343 SO != SOEnd; ++SO) { 2344 assert(SO->second.size() > 0 && 2345 "All virtual functions have overridding virtual functions"); 2346 if (SO->second.size() == 1) { 2347 // C++ [class.abstract]p4: 2348 // A class is abstract if it contains or inherits at least one 2349 // pure virtual function for which the final overrider is pure 2350 // virtual. 2351 if (SO->second.front().Method->isPure()) 2352 Record->setAbstract(true); 2353 continue; 2354 } 2355 2356 // C++ [class.virtual]p2: 2357 // In a derived class, if a virtual member function of a base 2358 // class subobject has more than one final overrider the 2359 // program is ill-formed. 2360 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2361 << (NamedDecl *)M->first << Record; 2362 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2363 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2364 OMEnd = SO->second.end(); 2365 OM != OMEnd; ++OM) 2366 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2367 << (NamedDecl *)M->first << OM->Method->getParent(); 2368 2369 Record->setInvalidDecl(); 2370 } 2371 } 2372 } 2373 2374 if (Record->isAbstract() && !Record->isInvalidDecl()) 2375 (void)AbstractClassUsageDiagnoser(*this, Record); 2376 2377 // If this is not an aggregate type and has no user-declared constructor, 2378 // complain about any non-static data members of reference or const scalar 2379 // type, since they will never get initializers. 2380 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2381 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2382 bool Complained = false; 2383 for (RecordDecl::field_iterator F = Record->field_begin(), 2384 FEnd = Record->field_end(); 2385 F != FEnd; ++F) { 2386 if (F->getType()->isReferenceType() || 2387 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2388 if (!Complained) { 2389 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2390 << Record->getTagKind() << Record; 2391 Complained = true; 2392 } 2393 2394 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2395 << F->getType()->isReferenceType() 2396 << F->getDeclName(); 2397 } 2398 } 2399 } 2400} 2401 2402void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2403 DeclPtrTy TagDecl, 2404 SourceLocation LBrac, 2405 SourceLocation RBrac, 2406 AttributeList *AttrList) { 2407 if (!TagDecl) 2408 return; 2409 2410 AdjustDeclIfTemplate(TagDecl); 2411 2412 ActOnFields(S, RLoc, TagDecl, 2413 (DeclPtrTy*)FieldCollector->getCurFields(), 2414 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2415 2416 CheckCompletedCXXClass(S, 2417 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2418} 2419 2420/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2421/// special functions, such as the default constructor, copy 2422/// constructor, or destructor, to the given C++ class (C++ 2423/// [special]p1). This routine can only be executed just before the 2424/// definition of the class is complete. 2425/// 2426/// The scope, if provided, is the class scope. 2427void Sema::AddImplicitlyDeclaredMembersToClass(Scope *S, 2428 CXXRecordDecl *ClassDecl) { 2429 CanQualType ClassType 2430 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2431 2432 // FIXME: Implicit declarations have exception specifications, which are 2433 // the union of the specifications of the implicitly called functions. 2434 2435 if (!ClassDecl->hasUserDeclaredConstructor()) { 2436 // C++ [class.ctor]p5: 2437 // A default constructor for a class X is a constructor of class X 2438 // that can be called without an argument. If there is no 2439 // user-declared constructor for class X, a default constructor is 2440 // implicitly declared. An implicitly-declared default constructor 2441 // is an inline public member of its class. 2442 DeclarationName Name 2443 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2444 CXXConstructorDecl *DefaultCon = 2445 CXXConstructorDecl::Create(Context, ClassDecl, 2446 ClassDecl->getLocation(), Name, 2447 Context.getFunctionType(Context.VoidTy, 2448 0, 0, false, 0, 2449 /*FIXME*/false, false, 2450 0, 0, 2451 FunctionType::ExtInfo()), 2452 /*TInfo=*/0, 2453 /*isExplicit=*/false, 2454 /*isInline=*/true, 2455 /*isImplicitlyDeclared=*/true); 2456 DefaultCon->setAccess(AS_public); 2457 DefaultCon->setImplicit(); 2458 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2459 if (S) 2460 PushOnScopeChains(DefaultCon, S, true); 2461 else 2462 ClassDecl->addDecl(DefaultCon); 2463 } 2464 2465 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2466 // C++ [class.copy]p4: 2467 // If the class definition does not explicitly declare a copy 2468 // constructor, one is declared implicitly. 2469 2470 // C++ [class.copy]p5: 2471 // The implicitly-declared copy constructor for a class X will 2472 // have the form 2473 // 2474 // X::X(const X&) 2475 // 2476 // if 2477 bool HasConstCopyConstructor = true; 2478 2479 // -- each direct or virtual base class B of X has a copy 2480 // constructor whose first parameter is of type const B& or 2481 // const volatile B&, and 2482 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2483 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2484 const CXXRecordDecl *BaseClassDecl 2485 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2486 HasConstCopyConstructor 2487 = BaseClassDecl->hasConstCopyConstructor(Context); 2488 } 2489 2490 // -- for all the nonstatic data members of X that are of a 2491 // class type M (or array thereof), each such class type 2492 // has a copy constructor whose first parameter is of type 2493 // const M& or const volatile M&. 2494 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2495 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2496 ++Field) { 2497 QualType FieldType = (*Field)->getType(); 2498 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2499 FieldType = Array->getElementType(); 2500 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2501 const CXXRecordDecl *FieldClassDecl 2502 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2503 HasConstCopyConstructor 2504 = FieldClassDecl->hasConstCopyConstructor(Context); 2505 } 2506 } 2507 2508 // Otherwise, the implicitly declared copy constructor will have 2509 // the form 2510 // 2511 // X::X(X&) 2512 QualType ArgType = ClassType; 2513 if (HasConstCopyConstructor) 2514 ArgType = ArgType.withConst(); 2515 ArgType = Context.getLValueReferenceType(ArgType); 2516 2517 // An implicitly-declared copy constructor is an inline public 2518 // member of its class. 2519 DeclarationName Name 2520 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2521 CXXConstructorDecl *CopyConstructor 2522 = CXXConstructorDecl::Create(Context, ClassDecl, 2523 ClassDecl->getLocation(), Name, 2524 Context.getFunctionType(Context.VoidTy, 2525 &ArgType, 1, 2526 false, 0, 2527 /*FIXME:*/false, 2528 false, 0, 0, 2529 FunctionType::ExtInfo()), 2530 /*TInfo=*/0, 2531 /*isExplicit=*/false, 2532 /*isInline=*/true, 2533 /*isImplicitlyDeclared=*/true); 2534 CopyConstructor->setAccess(AS_public); 2535 CopyConstructor->setImplicit(); 2536 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2537 2538 // Add the parameter to the constructor. 2539 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2540 ClassDecl->getLocation(), 2541 /*IdentifierInfo=*/0, 2542 ArgType, /*TInfo=*/0, 2543 VarDecl::None, 2544 VarDecl::None, 0); 2545 CopyConstructor->setParams(&FromParam, 1); 2546 if (S) 2547 PushOnScopeChains(CopyConstructor, S, true); 2548 else 2549 ClassDecl->addDecl(CopyConstructor); 2550 } 2551 2552 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2553 // Note: The following rules are largely analoguous to the copy 2554 // constructor rules. Note that virtual bases are not taken into account 2555 // for determining the argument type of the operator. Note also that 2556 // operators taking an object instead of a reference are allowed. 2557 // 2558 // C++ [class.copy]p10: 2559 // If the class definition does not explicitly declare a copy 2560 // assignment operator, one is declared implicitly. 2561 // The implicitly-defined copy assignment operator for a class X 2562 // will have the form 2563 // 2564 // X& X::operator=(const X&) 2565 // 2566 // if 2567 bool HasConstCopyAssignment = true; 2568 2569 // -- each direct base class B of X has a copy assignment operator 2570 // whose parameter is of type const B&, const volatile B& or B, 2571 // and 2572 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2573 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2574 assert(!Base->getType()->isDependentType() && 2575 "Cannot generate implicit members for class with dependent bases."); 2576 const CXXRecordDecl *BaseClassDecl 2577 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2578 const CXXMethodDecl *MD = 0; 2579 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2580 MD); 2581 } 2582 2583 // -- for all the nonstatic data members of X that are of a class 2584 // type M (or array thereof), each such class type has a copy 2585 // assignment operator whose parameter is of type const M&, 2586 // const volatile M& or M. 2587 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2588 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2589 ++Field) { 2590 QualType FieldType = (*Field)->getType(); 2591 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2592 FieldType = Array->getElementType(); 2593 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2594 const CXXRecordDecl *FieldClassDecl 2595 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2596 const CXXMethodDecl *MD = 0; 2597 HasConstCopyAssignment 2598 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2599 } 2600 } 2601 2602 // Otherwise, the implicitly declared copy assignment operator will 2603 // have the form 2604 // 2605 // X& X::operator=(X&) 2606 QualType ArgType = ClassType; 2607 QualType RetType = Context.getLValueReferenceType(ArgType); 2608 if (HasConstCopyAssignment) 2609 ArgType = ArgType.withConst(); 2610 ArgType = Context.getLValueReferenceType(ArgType); 2611 2612 // An implicitly-declared copy assignment operator is an inline public 2613 // member of its class. 2614 DeclarationName Name = 2615 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2616 CXXMethodDecl *CopyAssignment = 2617 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2618 Context.getFunctionType(RetType, &ArgType, 1, 2619 false, 0, 2620 /*FIXME:*/false, 2621 false, 0, 0, 2622 FunctionType::ExtInfo()), 2623 /*TInfo=*/0, /*isStatic=*/false, 2624 /*StorageClassAsWritten=*/FunctionDecl::None, 2625 /*isInline=*/true); 2626 CopyAssignment->setAccess(AS_public); 2627 CopyAssignment->setImplicit(); 2628 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2629 CopyAssignment->setCopyAssignment(true); 2630 2631 // Add the parameter to the operator. 2632 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2633 ClassDecl->getLocation(), 2634 /*IdentifierInfo=*/0, 2635 ArgType, /*TInfo=*/0, 2636 VarDecl::None, 2637 VarDecl::None, 0); 2638 CopyAssignment->setParams(&FromParam, 1); 2639 2640 // Don't call addedAssignmentOperator. There is no way to distinguish an 2641 // implicit from an explicit assignment operator. 2642 if (S) 2643 PushOnScopeChains(CopyAssignment, S, true); 2644 else 2645 ClassDecl->addDecl(CopyAssignment); 2646 AddOverriddenMethods(ClassDecl, CopyAssignment); 2647 } 2648 2649 if (!ClassDecl->hasUserDeclaredDestructor()) { 2650 // C++ [class.dtor]p2: 2651 // If a class has no user-declared destructor, a destructor is 2652 // declared implicitly. An implicitly-declared destructor is an 2653 // inline public member of its class. 2654 QualType Ty = Context.getFunctionType(Context.VoidTy, 2655 0, 0, false, 0, 2656 /*FIXME:*/false, 2657 false, 0, 0, FunctionType::ExtInfo()); 2658 2659 DeclarationName Name 2660 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2661 CXXDestructorDecl *Destructor 2662 = CXXDestructorDecl::Create(Context, ClassDecl, 2663 ClassDecl->getLocation(), Name, Ty, 2664 /*isInline=*/true, 2665 /*isImplicitlyDeclared=*/true); 2666 Destructor->setAccess(AS_public); 2667 Destructor->setImplicit(); 2668 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2669 if (S) 2670 PushOnScopeChains(Destructor, S, true); 2671 else 2672 ClassDecl->addDecl(Destructor); 2673 2674 // This could be uniqued if it ever proves significant. 2675 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2676 2677 AddOverriddenMethods(ClassDecl, Destructor); 2678 } 2679} 2680 2681void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2682 Decl *D = TemplateD.getAs<Decl>(); 2683 if (!D) 2684 return; 2685 2686 TemplateParameterList *Params = 0; 2687 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2688 Params = Template->getTemplateParameters(); 2689 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2690 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2691 Params = PartialSpec->getTemplateParameters(); 2692 else 2693 return; 2694 2695 for (TemplateParameterList::iterator Param = Params->begin(), 2696 ParamEnd = Params->end(); 2697 Param != ParamEnd; ++Param) { 2698 NamedDecl *Named = cast<NamedDecl>(*Param); 2699 if (Named->getDeclName()) { 2700 S->AddDecl(DeclPtrTy::make(Named)); 2701 IdResolver.AddDecl(Named); 2702 } 2703 } 2704} 2705 2706void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2707 if (!RecordD) return; 2708 AdjustDeclIfTemplate(RecordD); 2709 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2710 PushDeclContext(S, Record); 2711} 2712 2713void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2714 if (!RecordD) return; 2715 PopDeclContext(); 2716} 2717 2718/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2719/// parsing a top-level (non-nested) C++ class, and we are now 2720/// parsing those parts of the given Method declaration that could 2721/// not be parsed earlier (C++ [class.mem]p2), such as default 2722/// arguments. This action should enter the scope of the given 2723/// Method declaration as if we had just parsed the qualified method 2724/// name. However, it should not bring the parameters into scope; 2725/// that will be performed by ActOnDelayedCXXMethodParameter. 2726void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2727} 2728 2729/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2730/// C++ method declaration. We're (re-)introducing the given 2731/// function parameter into scope for use in parsing later parts of 2732/// the method declaration. For example, we could see an 2733/// ActOnParamDefaultArgument event for this parameter. 2734void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2735 if (!ParamD) 2736 return; 2737 2738 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2739 2740 // If this parameter has an unparsed default argument, clear it out 2741 // to make way for the parsed default argument. 2742 if (Param->hasUnparsedDefaultArg()) 2743 Param->setDefaultArg(0); 2744 2745 S->AddDecl(DeclPtrTy::make(Param)); 2746 if (Param->getDeclName()) 2747 IdResolver.AddDecl(Param); 2748} 2749 2750/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2751/// processing the delayed method declaration for Method. The method 2752/// declaration is now considered finished. There may be a separate 2753/// ActOnStartOfFunctionDef action later (not necessarily 2754/// immediately!) for this method, if it was also defined inside the 2755/// class body. 2756void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2757 if (!MethodD) 2758 return; 2759 2760 AdjustDeclIfTemplate(MethodD); 2761 2762 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2763 2764 // Now that we have our default arguments, check the constructor 2765 // again. It could produce additional diagnostics or affect whether 2766 // the class has implicitly-declared destructors, among other 2767 // things. 2768 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2769 CheckConstructor(Constructor); 2770 2771 // Check the default arguments, which we may have added. 2772 if (!Method->isInvalidDecl()) 2773 CheckCXXDefaultArguments(Method); 2774} 2775 2776/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2777/// the well-formedness of the constructor declarator @p D with type @p 2778/// R. If there are any errors in the declarator, this routine will 2779/// emit diagnostics and set the invalid bit to true. In any case, the type 2780/// will be updated to reflect a well-formed type for the constructor and 2781/// returned. 2782QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2783 FunctionDecl::StorageClass &SC) { 2784 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2785 2786 // C++ [class.ctor]p3: 2787 // A constructor shall not be virtual (10.3) or static (9.4). A 2788 // constructor can be invoked for a const, volatile or const 2789 // volatile object. A constructor shall not be declared const, 2790 // volatile, or const volatile (9.3.2). 2791 if (isVirtual) { 2792 if (!D.isInvalidType()) 2793 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2794 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2795 << SourceRange(D.getIdentifierLoc()); 2796 D.setInvalidType(); 2797 } 2798 if (SC == FunctionDecl::Static) { 2799 if (!D.isInvalidType()) 2800 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2801 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2802 << SourceRange(D.getIdentifierLoc()); 2803 D.setInvalidType(); 2804 SC = FunctionDecl::None; 2805 } 2806 2807 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2808 if (FTI.TypeQuals != 0) { 2809 if (FTI.TypeQuals & Qualifiers::Const) 2810 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2811 << "const" << SourceRange(D.getIdentifierLoc()); 2812 if (FTI.TypeQuals & Qualifiers::Volatile) 2813 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2814 << "volatile" << SourceRange(D.getIdentifierLoc()); 2815 if (FTI.TypeQuals & Qualifiers::Restrict) 2816 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2817 << "restrict" << SourceRange(D.getIdentifierLoc()); 2818 } 2819 2820 // Rebuild the function type "R" without any type qualifiers (in 2821 // case any of the errors above fired) and with "void" as the 2822 // return type, since constructors don't have return types. We 2823 // *always* have to do this, because GetTypeForDeclarator will 2824 // put in a result type of "int" when none was specified. 2825 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2826 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2827 Proto->getNumArgs(), 2828 Proto->isVariadic(), 0, 2829 Proto->hasExceptionSpec(), 2830 Proto->hasAnyExceptionSpec(), 2831 Proto->getNumExceptions(), 2832 Proto->exception_begin(), 2833 Proto->getExtInfo()); 2834} 2835 2836/// CheckConstructor - Checks a fully-formed constructor for 2837/// well-formedness, issuing any diagnostics required. Returns true if 2838/// the constructor declarator is invalid. 2839void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2840 CXXRecordDecl *ClassDecl 2841 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2842 if (!ClassDecl) 2843 return Constructor->setInvalidDecl(); 2844 2845 // C++ [class.copy]p3: 2846 // A declaration of a constructor for a class X is ill-formed if 2847 // its first parameter is of type (optionally cv-qualified) X and 2848 // either there are no other parameters or else all other 2849 // parameters have default arguments. 2850 if (!Constructor->isInvalidDecl() && 2851 ((Constructor->getNumParams() == 1) || 2852 (Constructor->getNumParams() > 1 && 2853 Constructor->getParamDecl(1)->hasDefaultArg())) && 2854 Constructor->getTemplateSpecializationKind() 2855 != TSK_ImplicitInstantiation) { 2856 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2857 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2858 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2859 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2860 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2861 << FixItHint::CreateInsertion(ParamLoc, " const &"); 2862 2863 // FIXME: Rather that making the constructor invalid, we should endeavor 2864 // to fix the type. 2865 Constructor->setInvalidDecl(); 2866 } 2867 } 2868 2869 // Notify the class that we've added a constructor. In principle we 2870 // don't need to do this for out-of-line declarations; in practice 2871 // we only instantiate the most recent declaration of a method, so 2872 // we have to call this for everything but friends. 2873 if (!Constructor->getFriendObjectKind()) 2874 ClassDecl->addedConstructor(Context, Constructor); 2875} 2876 2877/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2878/// issuing any diagnostics required. Returns true on error. 2879bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2880 CXXRecordDecl *RD = Destructor->getParent(); 2881 2882 if (Destructor->isVirtual()) { 2883 SourceLocation Loc; 2884 2885 if (!Destructor->isImplicit()) 2886 Loc = Destructor->getLocation(); 2887 else 2888 Loc = RD->getLocation(); 2889 2890 // If we have a virtual destructor, look up the deallocation function 2891 FunctionDecl *OperatorDelete = 0; 2892 DeclarationName Name = 2893 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2894 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2895 return true; 2896 2897 Destructor->setOperatorDelete(OperatorDelete); 2898 } 2899 2900 return false; 2901} 2902 2903static inline bool 2904FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2905 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2906 FTI.ArgInfo[0].Param && 2907 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2908} 2909 2910/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2911/// the well-formednes of the destructor declarator @p D with type @p 2912/// R. If there are any errors in the declarator, this routine will 2913/// emit diagnostics and set the declarator to invalid. Even if this happens, 2914/// will be updated to reflect a well-formed type for the destructor and 2915/// returned. 2916QualType Sema::CheckDestructorDeclarator(Declarator &D, 2917 FunctionDecl::StorageClass& SC) { 2918 // C++ [class.dtor]p1: 2919 // [...] A typedef-name that names a class is a class-name 2920 // (7.1.3); however, a typedef-name that names a class shall not 2921 // be used as the identifier in the declarator for a destructor 2922 // declaration. 2923 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2924 if (isa<TypedefType>(DeclaratorType)) { 2925 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2926 << DeclaratorType; 2927 D.setInvalidType(); 2928 } 2929 2930 // C++ [class.dtor]p2: 2931 // A destructor is used to destroy objects of its class type. A 2932 // destructor takes no parameters, and no return type can be 2933 // specified for it (not even void). The address of a destructor 2934 // shall not be taken. A destructor shall not be static. A 2935 // destructor can be invoked for a const, volatile or const 2936 // volatile object. A destructor shall not be declared const, 2937 // volatile or const volatile (9.3.2). 2938 if (SC == FunctionDecl::Static) { 2939 if (!D.isInvalidType()) 2940 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2941 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2942 << SourceRange(D.getIdentifierLoc()); 2943 SC = FunctionDecl::None; 2944 D.setInvalidType(); 2945 } 2946 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2947 // Destructors don't have return types, but the parser will 2948 // happily parse something like: 2949 // 2950 // class X { 2951 // float ~X(); 2952 // }; 2953 // 2954 // The return type will be eliminated later. 2955 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2956 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2957 << SourceRange(D.getIdentifierLoc()); 2958 } 2959 2960 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2961 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2962 if (FTI.TypeQuals & Qualifiers::Const) 2963 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2964 << "const" << SourceRange(D.getIdentifierLoc()); 2965 if (FTI.TypeQuals & Qualifiers::Volatile) 2966 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2967 << "volatile" << SourceRange(D.getIdentifierLoc()); 2968 if (FTI.TypeQuals & Qualifiers::Restrict) 2969 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2970 << "restrict" << SourceRange(D.getIdentifierLoc()); 2971 D.setInvalidType(); 2972 } 2973 2974 // Make sure we don't have any parameters. 2975 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2976 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2977 2978 // Delete the parameters. 2979 FTI.freeArgs(); 2980 D.setInvalidType(); 2981 } 2982 2983 // Make sure the destructor isn't variadic. 2984 if (FTI.isVariadic) { 2985 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2986 D.setInvalidType(); 2987 } 2988 2989 // Rebuild the function type "R" without any type qualifiers or 2990 // parameters (in case any of the errors above fired) and with 2991 // "void" as the return type, since destructors don't have return 2992 // types. We *always* have to do this, because GetTypeForDeclarator 2993 // will put in a result type of "int" when none was specified. 2994 // FIXME: Exceptions! 2995 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 2996 false, false, 0, 0, FunctionType::ExtInfo()); 2997} 2998 2999/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3000/// well-formednes of the conversion function declarator @p D with 3001/// type @p R. If there are any errors in the declarator, this routine 3002/// will emit diagnostics and return true. Otherwise, it will return 3003/// false. Either way, the type @p R will be updated to reflect a 3004/// well-formed type for the conversion operator. 3005void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3006 FunctionDecl::StorageClass& SC) { 3007 // C++ [class.conv.fct]p1: 3008 // Neither parameter types nor return type can be specified. The 3009 // type of a conversion function (8.3.5) is "function taking no 3010 // parameter returning conversion-type-id." 3011 if (SC == FunctionDecl::Static) { 3012 if (!D.isInvalidType()) 3013 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3014 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3015 << SourceRange(D.getIdentifierLoc()); 3016 D.setInvalidType(); 3017 SC = FunctionDecl::None; 3018 } 3019 3020 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3021 3022 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3023 // Conversion functions don't have return types, but the parser will 3024 // happily parse something like: 3025 // 3026 // class X { 3027 // float operator bool(); 3028 // }; 3029 // 3030 // The return type will be changed later anyway. 3031 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3032 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3033 << SourceRange(D.getIdentifierLoc()); 3034 D.setInvalidType(); 3035 } 3036 3037 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3038 3039 // Make sure we don't have any parameters. 3040 if (Proto->getNumArgs() > 0) { 3041 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3042 3043 // Delete the parameters. 3044 D.getTypeObject(0).Fun.freeArgs(); 3045 D.setInvalidType(); 3046 } else if (Proto->isVariadic()) { 3047 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3048 D.setInvalidType(); 3049 } 3050 3051 // Diagnose "&operator bool()" and other such nonsense. This 3052 // is actually a gcc extension which we don't support. 3053 if (Proto->getResultType() != ConvType) { 3054 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3055 << Proto->getResultType(); 3056 D.setInvalidType(); 3057 ConvType = Proto->getResultType(); 3058 } 3059 3060 // C++ [class.conv.fct]p4: 3061 // The conversion-type-id shall not represent a function type nor 3062 // an array type. 3063 if (ConvType->isArrayType()) { 3064 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3065 ConvType = Context.getPointerType(ConvType); 3066 D.setInvalidType(); 3067 } else if (ConvType->isFunctionType()) { 3068 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3069 ConvType = Context.getPointerType(ConvType); 3070 D.setInvalidType(); 3071 } 3072 3073 // Rebuild the function type "R" without any parameters (in case any 3074 // of the errors above fired) and with the conversion type as the 3075 // return type. 3076 if (D.isInvalidType()) { 3077 R = Context.getFunctionType(ConvType, 0, 0, false, 3078 Proto->getTypeQuals(), 3079 Proto->hasExceptionSpec(), 3080 Proto->hasAnyExceptionSpec(), 3081 Proto->getNumExceptions(), 3082 Proto->exception_begin(), 3083 Proto->getExtInfo()); 3084 } 3085 3086 // C++0x explicit conversion operators. 3087 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3088 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3089 diag::warn_explicit_conversion_functions) 3090 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3091} 3092 3093/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3094/// the declaration of the given C++ conversion function. This routine 3095/// is responsible for recording the conversion function in the C++ 3096/// class, if possible. 3097Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3098 assert(Conversion && "Expected to receive a conversion function declaration"); 3099 3100 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3101 3102 // Make sure we aren't redeclaring the conversion function. 3103 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3104 3105 // C++ [class.conv.fct]p1: 3106 // [...] A conversion function is never used to convert a 3107 // (possibly cv-qualified) object to the (possibly cv-qualified) 3108 // same object type (or a reference to it), to a (possibly 3109 // cv-qualified) base class of that type (or a reference to it), 3110 // or to (possibly cv-qualified) void. 3111 // FIXME: Suppress this warning if the conversion function ends up being a 3112 // virtual function that overrides a virtual function in a base class. 3113 QualType ClassType 3114 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3115 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3116 ConvType = ConvTypeRef->getPointeeType(); 3117 if (ConvType->isRecordType()) { 3118 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3119 if (ConvType == ClassType) 3120 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3121 << ClassType; 3122 else if (IsDerivedFrom(ClassType, ConvType)) 3123 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3124 << ClassType << ConvType; 3125 } else if (ConvType->isVoidType()) { 3126 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3127 << ClassType << ConvType; 3128 } 3129 3130 if (Conversion->getPrimaryTemplate()) { 3131 // ignore specializations 3132 } else if (Conversion->getPreviousDeclaration()) { 3133 if (FunctionTemplateDecl *ConversionTemplate 3134 = Conversion->getDescribedFunctionTemplate()) { 3135 if (ClassDecl->replaceConversion( 3136 ConversionTemplate->getPreviousDeclaration(), 3137 ConversionTemplate)) 3138 return DeclPtrTy::make(ConversionTemplate); 3139 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3140 Conversion)) 3141 return DeclPtrTy::make(Conversion); 3142 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3143 } else if (FunctionTemplateDecl *ConversionTemplate 3144 = Conversion->getDescribedFunctionTemplate()) 3145 ClassDecl->addConversionFunction(ConversionTemplate); 3146 else 3147 ClassDecl->addConversionFunction(Conversion); 3148 3149 return DeclPtrTy::make(Conversion); 3150} 3151 3152//===----------------------------------------------------------------------===// 3153// Namespace Handling 3154//===----------------------------------------------------------------------===// 3155 3156/// ActOnStartNamespaceDef - This is called at the start of a namespace 3157/// definition. 3158Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3159 SourceLocation IdentLoc, 3160 IdentifierInfo *II, 3161 SourceLocation LBrace, 3162 AttributeList *AttrList) { 3163 NamespaceDecl *Namespc = 3164 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3165 Namespc->setLBracLoc(LBrace); 3166 3167 Scope *DeclRegionScope = NamespcScope->getParent(); 3168 3169 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3170 3171 if (II) { 3172 // C++ [namespace.def]p2: 3173 // The identifier in an original-namespace-definition shall not have been 3174 // previously defined in the declarative region in which the 3175 // original-namespace-definition appears. The identifier in an 3176 // original-namespace-definition is the name of the namespace. Subsequently 3177 // in that declarative region, it is treated as an original-namespace-name. 3178 3179 NamedDecl *PrevDecl 3180 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3181 ForRedeclaration); 3182 3183 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3184 // This is an extended namespace definition. 3185 // Attach this namespace decl to the chain of extended namespace 3186 // definitions. 3187 OrigNS->setNextNamespace(Namespc); 3188 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3189 3190 // Remove the previous declaration from the scope. 3191 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3192 IdResolver.RemoveDecl(OrigNS); 3193 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3194 } 3195 } else if (PrevDecl) { 3196 // This is an invalid name redefinition. 3197 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3198 << Namespc->getDeclName(); 3199 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3200 Namespc->setInvalidDecl(); 3201 // Continue on to push Namespc as current DeclContext and return it. 3202 } else if (II->isStr("std") && 3203 CurContext->getLookupContext()->isTranslationUnit()) { 3204 // This is the first "real" definition of the namespace "std", so update 3205 // our cache of the "std" namespace to point at this definition. 3206 if (StdNamespace) { 3207 // We had already defined a dummy namespace "std". Link this new 3208 // namespace definition to the dummy namespace "std". 3209 StdNamespace->setNextNamespace(Namespc); 3210 StdNamespace->setLocation(IdentLoc); 3211 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 3212 } 3213 3214 // Make our StdNamespace cache point at the first real definition of the 3215 // "std" namespace. 3216 StdNamespace = Namespc; 3217 } 3218 3219 PushOnScopeChains(Namespc, DeclRegionScope); 3220 } else { 3221 // Anonymous namespaces. 3222 assert(Namespc->isAnonymousNamespace()); 3223 3224 // Link the anonymous namespace into its parent. 3225 NamespaceDecl *PrevDecl; 3226 DeclContext *Parent = CurContext->getLookupContext(); 3227 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3228 PrevDecl = TU->getAnonymousNamespace(); 3229 TU->setAnonymousNamespace(Namespc); 3230 } else { 3231 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3232 PrevDecl = ND->getAnonymousNamespace(); 3233 ND->setAnonymousNamespace(Namespc); 3234 } 3235 3236 // Link the anonymous namespace with its previous declaration. 3237 if (PrevDecl) { 3238 assert(PrevDecl->isAnonymousNamespace()); 3239 assert(!PrevDecl->getNextNamespace()); 3240 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3241 PrevDecl->setNextNamespace(Namespc); 3242 } 3243 3244 CurContext->addDecl(Namespc); 3245 3246 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3247 // behaves as if it were replaced by 3248 // namespace unique { /* empty body */ } 3249 // using namespace unique; 3250 // namespace unique { namespace-body } 3251 // where all occurrences of 'unique' in a translation unit are 3252 // replaced by the same identifier and this identifier differs 3253 // from all other identifiers in the entire program. 3254 3255 // We just create the namespace with an empty name and then add an 3256 // implicit using declaration, just like the standard suggests. 3257 // 3258 // CodeGen enforces the "universally unique" aspect by giving all 3259 // declarations semantically contained within an anonymous 3260 // namespace internal linkage. 3261 3262 if (!PrevDecl) { 3263 UsingDirectiveDecl* UD 3264 = UsingDirectiveDecl::Create(Context, CurContext, 3265 /* 'using' */ LBrace, 3266 /* 'namespace' */ SourceLocation(), 3267 /* qualifier */ SourceRange(), 3268 /* NNS */ NULL, 3269 /* identifier */ SourceLocation(), 3270 Namespc, 3271 /* Ancestor */ CurContext); 3272 UD->setImplicit(); 3273 CurContext->addDecl(UD); 3274 } 3275 } 3276 3277 // Although we could have an invalid decl (i.e. the namespace name is a 3278 // redefinition), push it as current DeclContext and try to continue parsing. 3279 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3280 // for the namespace has the declarations that showed up in that particular 3281 // namespace definition. 3282 PushDeclContext(NamespcScope, Namespc); 3283 return DeclPtrTy::make(Namespc); 3284} 3285 3286/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3287/// is a namespace alias, returns the namespace it points to. 3288static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3289 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3290 return AD->getNamespace(); 3291 return dyn_cast_or_null<NamespaceDecl>(D); 3292} 3293 3294/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3295/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3296void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3297 Decl *Dcl = D.getAs<Decl>(); 3298 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3299 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3300 Namespc->setRBracLoc(RBrace); 3301 PopDeclContext(); 3302} 3303 3304Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3305 SourceLocation UsingLoc, 3306 SourceLocation NamespcLoc, 3307 CXXScopeSpec &SS, 3308 SourceLocation IdentLoc, 3309 IdentifierInfo *NamespcName, 3310 AttributeList *AttrList) { 3311 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3312 assert(NamespcName && "Invalid NamespcName."); 3313 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3314 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3315 3316 UsingDirectiveDecl *UDir = 0; 3317 3318 // Lookup namespace name. 3319 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3320 LookupParsedName(R, S, &SS); 3321 if (R.isAmbiguous()) 3322 return DeclPtrTy(); 3323 3324 if (!R.empty()) { 3325 NamedDecl *Named = R.getFoundDecl(); 3326 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3327 && "expected namespace decl"); 3328 // C++ [namespace.udir]p1: 3329 // A using-directive specifies that the names in the nominated 3330 // namespace can be used in the scope in which the 3331 // using-directive appears after the using-directive. During 3332 // unqualified name lookup (3.4.1), the names appear as if they 3333 // were declared in the nearest enclosing namespace which 3334 // contains both the using-directive and the nominated 3335 // namespace. [Note: in this context, "contains" means "contains 3336 // directly or indirectly". ] 3337 3338 // Find enclosing context containing both using-directive and 3339 // nominated namespace. 3340 NamespaceDecl *NS = getNamespaceDecl(Named); 3341 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3342 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3343 CommonAncestor = CommonAncestor->getParent(); 3344 3345 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3346 SS.getRange(), 3347 (NestedNameSpecifier *)SS.getScopeRep(), 3348 IdentLoc, Named, CommonAncestor); 3349 PushUsingDirective(S, UDir); 3350 } else { 3351 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3352 } 3353 3354 // FIXME: We ignore attributes for now. 3355 delete AttrList; 3356 return DeclPtrTy::make(UDir); 3357} 3358 3359void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3360 // If scope has associated entity, then using directive is at namespace 3361 // or translation unit scope. We add UsingDirectiveDecls, into 3362 // it's lookup structure. 3363 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3364 Ctx->addDecl(UDir); 3365 else 3366 // Otherwise it is block-sope. using-directives will affect lookup 3367 // only to the end of scope. 3368 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3369} 3370 3371 3372Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3373 AccessSpecifier AS, 3374 bool HasUsingKeyword, 3375 SourceLocation UsingLoc, 3376 CXXScopeSpec &SS, 3377 UnqualifiedId &Name, 3378 AttributeList *AttrList, 3379 bool IsTypeName, 3380 SourceLocation TypenameLoc) { 3381 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3382 3383 switch (Name.getKind()) { 3384 case UnqualifiedId::IK_Identifier: 3385 case UnqualifiedId::IK_OperatorFunctionId: 3386 case UnqualifiedId::IK_LiteralOperatorId: 3387 case UnqualifiedId::IK_ConversionFunctionId: 3388 break; 3389 3390 case UnqualifiedId::IK_ConstructorName: 3391 case UnqualifiedId::IK_ConstructorTemplateId: 3392 // C++0x inherited constructors. 3393 if (getLangOptions().CPlusPlus0x) break; 3394 3395 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3396 << SS.getRange(); 3397 return DeclPtrTy(); 3398 3399 case UnqualifiedId::IK_DestructorName: 3400 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3401 << SS.getRange(); 3402 return DeclPtrTy(); 3403 3404 case UnqualifiedId::IK_TemplateId: 3405 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3406 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3407 return DeclPtrTy(); 3408 } 3409 3410 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3411 if (!TargetName) 3412 return DeclPtrTy(); 3413 3414 // Warn about using declarations. 3415 // TODO: store that the declaration was written without 'using' and 3416 // talk about access decls instead of using decls in the 3417 // diagnostics. 3418 if (!HasUsingKeyword) { 3419 UsingLoc = Name.getSourceRange().getBegin(); 3420 3421 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3422 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3423 } 3424 3425 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3426 Name.getSourceRange().getBegin(), 3427 TargetName, AttrList, 3428 /* IsInstantiation */ false, 3429 IsTypeName, TypenameLoc); 3430 if (UD) 3431 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3432 3433 return DeclPtrTy::make(UD); 3434} 3435 3436/// Determines whether to create a using shadow decl for a particular 3437/// decl, given the set of decls existing prior to this using lookup. 3438bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3439 const LookupResult &Previous) { 3440 // Diagnose finding a decl which is not from a base class of the 3441 // current class. We do this now because there are cases where this 3442 // function will silently decide not to build a shadow decl, which 3443 // will pre-empt further diagnostics. 3444 // 3445 // We don't need to do this in C++0x because we do the check once on 3446 // the qualifier. 3447 // 3448 // FIXME: diagnose the following if we care enough: 3449 // struct A { int foo; }; 3450 // struct B : A { using A::foo; }; 3451 // template <class T> struct C : A {}; 3452 // template <class T> struct D : C<T> { using B::foo; } // <--- 3453 // This is invalid (during instantiation) in C++03 because B::foo 3454 // resolves to the using decl in B, which is not a base class of D<T>. 3455 // We can't diagnose it immediately because C<T> is an unknown 3456 // specialization. The UsingShadowDecl in D<T> then points directly 3457 // to A::foo, which will look well-formed when we instantiate. 3458 // The right solution is to not collapse the shadow-decl chain. 3459 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3460 DeclContext *OrigDC = Orig->getDeclContext(); 3461 3462 // Handle enums and anonymous structs. 3463 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3464 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3465 while (OrigRec->isAnonymousStructOrUnion()) 3466 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3467 3468 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3469 if (OrigDC == CurContext) { 3470 Diag(Using->getLocation(), 3471 diag::err_using_decl_nested_name_specifier_is_current_class) 3472 << Using->getNestedNameRange(); 3473 Diag(Orig->getLocation(), diag::note_using_decl_target); 3474 return true; 3475 } 3476 3477 Diag(Using->getNestedNameRange().getBegin(), 3478 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3479 << Using->getTargetNestedNameDecl() 3480 << cast<CXXRecordDecl>(CurContext) 3481 << Using->getNestedNameRange(); 3482 Diag(Orig->getLocation(), diag::note_using_decl_target); 3483 return true; 3484 } 3485 } 3486 3487 if (Previous.empty()) return false; 3488 3489 NamedDecl *Target = Orig; 3490 if (isa<UsingShadowDecl>(Target)) 3491 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3492 3493 // If the target happens to be one of the previous declarations, we 3494 // don't have a conflict. 3495 // 3496 // FIXME: but we might be increasing its access, in which case we 3497 // should redeclare it. 3498 NamedDecl *NonTag = 0, *Tag = 0; 3499 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3500 I != E; ++I) { 3501 NamedDecl *D = (*I)->getUnderlyingDecl(); 3502 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3503 return false; 3504 3505 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3506 } 3507 3508 if (Target->isFunctionOrFunctionTemplate()) { 3509 FunctionDecl *FD; 3510 if (isa<FunctionTemplateDecl>(Target)) 3511 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3512 else 3513 FD = cast<FunctionDecl>(Target); 3514 3515 NamedDecl *OldDecl = 0; 3516 switch (CheckOverload(FD, Previous, OldDecl)) { 3517 case Ovl_Overload: 3518 return false; 3519 3520 case Ovl_NonFunction: 3521 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3522 break; 3523 3524 // We found a decl with the exact signature. 3525 case Ovl_Match: 3526 if (isa<UsingShadowDecl>(OldDecl)) { 3527 // Silently ignore the possible conflict. 3528 return false; 3529 } 3530 3531 // If we're in a record, we want to hide the target, so we 3532 // return true (without a diagnostic) to tell the caller not to 3533 // build a shadow decl. 3534 if (CurContext->isRecord()) 3535 return true; 3536 3537 // If we're not in a record, this is an error. 3538 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3539 break; 3540 } 3541 3542 Diag(Target->getLocation(), diag::note_using_decl_target); 3543 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3544 return true; 3545 } 3546 3547 // Target is not a function. 3548 3549 if (isa<TagDecl>(Target)) { 3550 // No conflict between a tag and a non-tag. 3551 if (!Tag) return false; 3552 3553 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3554 Diag(Target->getLocation(), diag::note_using_decl_target); 3555 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3556 return true; 3557 } 3558 3559 // No conflict between a tag and a non-tag. 3560 if (!NonTag) return false; 3561 3562 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3563 Diag(Target->getLocation(), diag::note_using_decl_target); 3564 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3565 return true; 3566} 3567 3568/// Builds a shadow declaration corresponding to a 'using' declaration. 3569UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3570 UsingDecl *UD, 3571 NamedDecl *Orig) { 3572 3573 // If we resolved to another shadow declaration, just coalesce them. 3574 NamedDecl *Target = Orig; 3575 if (isa<UsingShadowDecl>(Target)) { 3576 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3577 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3578 } 3579 3580 UsingShadowDecl *Shadow 3581 = UsingShadowDecl::Create(Context, CurContext, 3582 UD->getLocation(), UD, Target); 3583 UD->addShadowDecl(Shadow); 3584 3585 if (S) 3586 PushOnScopeChains(Shadow, S); 3587 else 3588 CurContext->addDecl(Shadow); 3589 Shadow->setAccess(UD->getAccess()); 3590 3591 // Register it as a conversion if appropriate. 3592 if (Shadow->getDeclName().getNameKind() 3593 == DeclarationName::CXXConversionFunctionName) 3594 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3595 3596 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3597 Shadow->setInvalidDecl(); 3598 3599 return Shadow; 3600} 3601 3602/// Hides a using shadow declaration. This is required by the current 3603/// using-decl implementation when a resolvable using declaration in a 3604/// class is followed by a declaration which would hide or override 3605/// one or more of the using decl's targets; for example: 3606/// 3607/// struct Base { void foo(int); }; 3608/// struct Derived : Base { 3609/// using Base::foo; 3610/// void foo(int); 3611/// }; 3612/// 3613/// The governing language is C++03 [namespace.udecl]p12: 3614/// 3615/// When a using-declaration brings names from a base class into a 3616/// derived class scope, member functions in the derived class 3617/// override and/or hide member functions with the same name and 3618/// parameter types in a base class (rather than conflicting). 3619/// 3620/// There are two ways to implement this: 3621/// (1) optimistically create shadow decls when they're not hidden 3622/// by existing declarations, or 3623/// (2) don't create any shadow decls (or at least don't make them 3624/// visible) until we've fully parsed/instantiated the class. 3625/// The problem with (1) is that we might have to retroactively remove 3626/// a shadow decl, which requires several O(n) operations because the 3627/// decl structures are (very reasonably) not designed for removal. 3628/// (2) avoids this but is very fiddly and phase-dependent. 3629void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3630 if (Shadow->getDeclName().getNameKind() == 3631 DeclarationName::CXXConversionFunctionName) 3632 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3633 3634 // Remove it from the DeclContext... 3635 Shadow->getDeclContext()->removeDecl(Shadow); 3636 3637 // ...and the scope, if applicable... 3638 if (S) { 3639 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3640 IdResolver.RemoveDecl(Shadow); 3641 } 3642 3643 // ...and the using decl. 3644 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3645 3646 // TODO: complain somehow if Shadow was used. It shouldn't 3647 // be possible for this to happen, because...? 3648} 3649 3650/// Builds a using declaration. 3651/// 3652/// \param IsInstantiation - Whether this call arises from an 3653/// instantiation of an unresolved using declaration. We treat 3654/// the lookup differently for these declarations. 3655NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3656 SourceLocation UsingLoc, 3657 CXXScopeSpec &SS, 3658 SourceLocation IdentLoc, 3659 DeclarationName Name, 3660 AttributeList *AttrList, 3661 bool IsInstantiation, 3662 bool IsTypeName, 3663 SourceLocation TypenameLoc) { 3664 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3665 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3666 3667 // FIXME: We ignore attributes for now. 3668 delete AttrList; 3669 3670 if (SS.isEmpty()) { 3671 Diag(IdentLoc, diag::err_using_requires_qualname); 3672 return 0; 3673 } 3674 3675 // Do the redeclaration lookup in the current scope. 3676 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3677 ForRedeclaration); 3678 Previous.setHideTags(false); 3679 if (S) { 3680 LookupName(Previous, S); 3681 3682 // It is really dumb that we have to do this. 3683 LookupResult::Filter F = Previous.makeFilter(); 3684 while (F.hasNext()) { 3685 NamedDecl *D = F.next(); 3686 if (!isDeclInScope(D, CurContext, S)) 3687 F.erase(); 3688 } 3689 F.done(); 3690 } else { 3691 assert(IsInstantiation && "no scope in non-instantiation"); 3692 assert(CurContext->isRecord() && "scope not record in instantiation"); 3693 LookupQualifiedName(Previous, CurContext); 3694 } 3695 3696 NestedNameSpecifier *NNS = 3697 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3698 3699 // Check for invalid redeclarations. 3700 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3701 return 0; 3702 3703 // Check for bad qualifiers. 3704 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3705 return 0; 3706 3707 DeclContext *LookupContext = computeDeclContext(SS); 3708 NamedDecl *D; 3709 if (!LookupContext) { 3710 if (IsTypeName) { 3711 // FIXME: not all declaration name kinds are legal here 3712 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3713 UsingLoc, TypenameLoc, 3714 SS.getRange(), NNS, 3715 IdentLoc, Name); 3716 } else { 3717 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3718 UsingLoc, SS.getRange(), NNS, 3719 IdentLoc, Name); 3720 } 3721 } else { 3722 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3723 SS.getRange(), UsingLoc, NNS, Name, 3724 IsTypeName); 3725 } 3726 D->setAccess(AS); 3727 CurContext->addDecl(D); 3728 3729 if (!LookupContext) return D; 3730 UsingDecl *UD = cast<UsingDecl>(D); 3731 3732 if (RequireCompleteDeclContext(SS)) { 3733 UD->setInvalidDecl(); 3734 return UD; 3735 } 3736 3737 // Look up the target name. 3738 3739 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3740 3741 // Unlike most lookups, we don't always want to hide tag 3742 // declarations: tag names are visible through the using declaration 3743 // even if hidden by ordinary names, *except* in a dependent context 3744 // where it's important for the sanity of two-phase lookup. 3745 if (!IsInstantiation) 3746 R.setHideTags(false); 3747 3748 LookupQualifiedName(R, LookupContext); 3749 3750 if (R.empty()) { 3751 Diag(IdentLoc, diag::err_no_member) 3752 << Name << LookupContext << SS.getRange(); 3753 UD->setInvalidDecl(); 3754 return UD; 3755 } 3756 3757 if (R.isAmbiguous()) { 3758 UD->setInvalidDecl(); 3759 return UD; 3760 } 3761 3762 if (IsTypeName) { 3763 // If we asked for a typename and got a non-type decl, error out. 3764 if (!R.getAsSingle<TypeDecl>()) { 3765 Diag(IdentLoc, diag::err_using_typename_non_type); 3766 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3767 Diag((*I)->getUnderlyingDecl()->getLocation(), 3768 diag::note_using_decl_target); 3769 UD->setInvalidDecl(); 3770 return UD; 3771 } 3772 } else { 3773 // If we asked for a non-typename and we got a type, error out, 3774 // but only if this is an instantiation of an unresolved using 3775 // decl. Otherwise just silently find the type name. 3776 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3777 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3778 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3779 UD->setInvalidDecl(); 3780 return UD; 3781 } 3782 } 3783 3784 // C++0x N2914 [namespace.udecl]p6: 3785 // A using-declaration shall not name a namespace. 3786 if (R.getAsSingle<NamespaceDecl>()) { 3787 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3788 << SS.getRange(); 3789 UD->setInvalidDecl(); 3790 return UD; 3791 } 3792 3793 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3794 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3795 BuildUsingShadowDecl(S, UD, *I); 3796 } 3797 3798 return UD; 3799} 3800 3801/// Checks that the given using declaration is not an invalid 3802/// redeclaration. Note that this is checking only for the using decl 3803/// itself, not for any ill-formedness among the UsingShadowDecls. 3804bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3805 bool isTypeName, 3806 const CXXScopeSpec &SS, 3807 SourceLocation NameLoc, 3808 const LookupResult &Prev) { 3809 // C++03 [namespace.udecl]p8: 3810 // C++0x [namespace.udecl]p10: 3811 // A using-declaration is a declaration and can therefore be used 3812 // repeatedly where (and only where) multiple declarations are 3813 // allowed. 3814 // That's only in file contexts. 3815 if (CurContext->getLookupContext()->isFileContext()) 3816 return false; 3817 3818 NestedNameSpecifier *Qual 3819 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3820 3821 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3822 NamedDecl *D = *I; 3823 3824 bool DTypename; 3825 NestedNameSpecifier *DQual; 3826 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3827 DTypename = UD->isTypeName(); 3828 DQual = UD->getTargetNestedNameDecl(); 3829 } else if (UnresolvedUsingValueDecl *UD 3830 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3831 DTypename = false; 3832 DQual = UD->getTargetNestedNameSpecifier(); 3833 } else if (UnresolvedUsingTypenameDecl *UD 3834 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3835 DTypename = true; 3836 DQual = UD->getTargetNestedNameSpecifier(); 3837 } else continue; 3838 3839 // using decls differ if one says 'typename' and the other doesn't. 3840 // FIXME: non-dependent using decls? 3841 if (isTypeName != DTypename) continue; 3842 3843 // using decls differ if they name different scopes (but note that 3844 // template instantiation can cause this check to trigger when it 3845 // didn't before instantiation). 3846 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3847 Context.getCanonicalNestedNameSpecifier(DQual)) 3848 continue; 3849 3850 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3851 Diag(D->getLocation(), diag::note_using_decl) << 1; 3852 return true; 3853 } 3854 3855 return false; 3856} 3857 3858 3859/// Checks that the given nested-name qualifier used in a using decl 3860/// in the current context is appropriately related to the current 3861/// scope. If an error is found, diagnoses it and returns true. 3862bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3863 const CXXScopeSpec &SS, 3864 SourceLocation NameLoc) { 3865 DeclContext *NamedContext = computeDeclContext(SS); 3866 3867 if (!CurContext->isRecord()) { 3868 // C++03 [namespace.udecl]p3: 3869 // C++0x [namespace.udecl]p8: 3870 // A using-declaration for a class member shall be a member-declaration. 3871 3872 // If we weren't able to compute a valid scope, it must be a 3873 // dependent class scope. 3874 if (!NamedContext || NamedContext->isRecord()) { 3875 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3876 << SS.getRange(); 3877 return true; 3878 } 3879 3880 // Otherwise, everything is known to be fine. 3881 return false; 3882 } 3883 3884 // The current scope is a record. 3885 3886 // If the named context is dependent, we can't decide much. 3887 if (!NamedContext) { 3888 // FIXME: in C++0x, we can diagnose if we can prove that the 3889 // nested-name-specifier does not refer to a base class, which is 3890 // still possible in some cases. 3891 3892 // Otherwise we have to conservatively report that things might be 3893 // okay. 3894 return false; 3895 } 3896 3897 if (!NamedContext->isRecord()) { 3898 // Ideally this would point at the last name in the specifier, 3899 // but we don't have that level of source info. 3900 Diag(SS.getRange().getBegin(), 3901 diag::err_using_decl_nested_name_specifier_is_not_class) 3902 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3903 return true; 3904 } 3905 3906 if (getLangOptions().CPlusPlus0x) { 3907 // C++0x [namespace.udecl]p3: 3908 // In a using-declaration used as a member-declaration, the 3909 // nested-name-specifier shall name a base class of the class 3910 // being defined. 3911 3912 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3913 cast<CXXRecordDecl>(NamedContext))) { 3914 if (CurContext == NamedContext) { 3915 Diag(NameLoc, 3916 diag::err_using_decl_nested_name_specifier_is_current_class) 3917 << SS.getRange(); 3918 return true; 3919 } 3920 3921 Diag(SS.getRange().getBegin(), 3922 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3923 << (NestedNameSpecifier*) SS.getScopeRep() 3924 << cast<CXXRecordDecl>(CurContext) 3925 << SS.getRange(); 3926 return true; 3927 } 3928 3929 return false; 3930 } 3931 3932 // C++03 [namespace.udecl]p4: 3933 // A using-declaration used as a member-declaration shall refer 3934 // to a member of a base class of the class being defined [etc.]. 3935 3936 // Salient point: SS doesn't have to name a base class as long as 3937 // lookup only finds members from base classes. Therefore we can 3938 // diagnose here only if we can prove that that can't happen, 3939 // i.e. if the class hierarchies provably don't intersect. 3940 3941 // TODO: it would be nice if "definitely valid" results were cached 3942 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3943 // need to be repeated. 3944 3945 struct UserData { 3946 llvm::DenseSet<const CXXRecordDecl*> Bases; 3947 3948 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3949 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3950 Data->Bases.insert(Base); 3951 return true; 3952 } 3953 3954 bool hasDependentBases(const CXXRecordDecl *Class) { 3955 return !Class->forallBases(collect, this); 3956 } 3957 3958 /// Returns true if the base is dependent or is one of the 3959 /// accumulated base classes. 3960 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3961 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3962 return !Data->Bases.count(Base); 3963 } 3964 3965 bool mightShareBases(const CXXRecordDecl *Class) { 3966 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3967 } 3968 }; 3969 3970 UserData Data; 3971 3972 // Returns false if we find a dependent base. 3973 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3974 return false; 3975 3976 // Returns false if the class has a dependent base or if it or one 3977 // of its bases is present in the base set of the current context. 3978 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3979 return false; 3980 3981 Diag(SS.getRange().getBegin(), 3982 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3983 << (NestedNameSpecifier*) SS.getScopeRep() 3984 << cast<CXXRecordDecl>(CurContext) 3985 << SS.getRange(); 3986 3987 return true; 3988} 3989 3990Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3991 SourceLocation NamespaceLoc, 3992 SourceLocation AliasLoc, 3993 IdentifierInfo *Alias, 3994 CXXScopeSpec &SS, 3995 SourceLocation IdentLoc, 3996 IdentifierInfo *Ident) { 3997 3998 // Lookup the namespace name. 3999 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4000 LookupParsedName(R, S, &SS); 4001 4002 // Check if we have a previous declaration with the same name. 4003 if (NamedDecl *PrevDecl 4004 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4005 ForRedeclaration)) { 4006 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4007 // We already have an alias with the same name that points to the same 4008 // namespace, so don't create a new one. 4009 // FIXME: At some point, we'll want to create the (redundant) 4010 // declaration to maintain better source information. 4011 if (!R.isAmbiguous() && !R.empty() && 4012 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4013 return DeclPtrTy(); 4014 } 4015 4016 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4017 diag::err_redefinition_different_kind; 4018 Diag(AliasLoc, DiagID) << Alias; 4019 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4020 return DeclPtrTy(); 4021 } 4022 4023 if (R.isAmbiguous()) 4024 return DeclPtrTy(); 4025 4026 if (R.empty()) { 4027 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4028 return DeclPtrTy(); 4029 } 4030 4031 NamespaceAliasDecl *AliasDecl = 4032 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4033 Alias, SS.getRange(), 4034 (NestedNameSpecifier *)SS.getScopeRep(), 4035 IdentLoc, R.getFoundDecl()); 4036 4037 PushOnScopeChains(AliasDecl, S); 4038 return DeclPtrTy::make(AliasDecl); 4039} 4040 4041void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4042 CXXConstructorDecl *Constructor) { 4043 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4044 !Constructor->isUsed()) && 4045 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4046 4047 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4048 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4049 4050 DeclContext *PreviousContext = CurContext; 4051 CurContext = Constructor; 4052 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false)) { 4053 Diag(CurrentLocation, diag::note_member_synthesized_at) 4054 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4055 Constructor->setInvalidDecl(); 4056 } else { 4057 Constructor->setUsed(); 4058 } 4059 CurContext = PreviousContext; 4060} 4061 4062void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4063 CXXDestructorDecl *Destructor) { 4064 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 4065 "DefineImplicitDestructor - call it for implicit default dtor"); 4066 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4067 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4068 4069 DeclContext *PreviousContext = CurContext; 4070 CurContext = Destructor; 4071 4072 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4073 Destructor->getParent()); 4074 4075 // FIXME: If CheckDestructor fails, we should emit a note about where the 4076 // implicit destructor was needed. 4077 if (CheckDestructor(Destructor)) { 4078 Diag(CurrentLocation, diag::note_member_synthesized_at) 4079 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4080 4081 Destructor->setInvalidDecl(); 4082 CurContext = PreviousContext; 4083 4084 return; 4085 } 4086 CurContext = PreviousContext; 4087 4088 Destructor->setUsed(); 4089} 4090 4091void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 4092 CXXMethodDecl *MethodDecl) { 4093 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 4094 MethodDecl->getOverloadedOperator() == OO_Equal && 4095 !MethodDecl->isUsed()) && 4096 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 4097 4098 CXXRecordDecl *ClassDecl 4099 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 4100 4101 DeclContext *PreviousContext = CurContext; 4102 CurContext = MethodDecl; 4103 4104 // C++[class.copy] p12 4105 // Before the implicitly-declared copy assignment operator for a class is 4106 // implicitly defined, all implicitly-declared copy assignment operators 4107 // for its direct base classes and its nonstatic data members shall have 4108 // been implicitly defined. 4109 bool err = false; 4110 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4111 E = ClassDecl->bases_end(); Base != E; ++Base) { 4112 CXXRecordDecl *BaseClassDecl 4113 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4114 if (CXXMethodDecl *BaseAssignOpMethod = 4115 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 4116 BaseClassDecl)) { 4117 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 4118 BaseAssignOpMethod, 4119 PDiag(diag::err_access_assign_base) 4120 << Base->getType()); 4121 4122 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 4123 } 4124 } 4125 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4126 E = ClassDecl->field_end(); Field != E; ++Field) { 4127 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 4128 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 4129 FieldType = Array->getElementType(); 4130 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4131 CXXRecordDecl *FieldClassDecl 4132 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4133 if (CXXMethodDecl *FieldAssignOpMethod = 4134 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 4135 FieldClassDecl)) { 4136 CheckDirectMemberAccess(Field->getLocation(), 4137 FieldAssignOpMethod, 4138 PDiag(diag::err_access_assign_field) 4139 << Field->getDeclName() << Field->getType()); 4140 4141 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 4142 } 4143 } else if (FieldType->isReferenceType()) { 4144 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4145 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4146 Diag(Field->getLocation(), diag::note_declared_at); 4147 Diag(CurrentLocation, diag::note_first_required_here); 4148 err = true; 4149 } else if (FieldType.isConstQualified()) { 4150 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4151 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4152 Diag(Field->getLocation(), diag::note_declared_at); 4153 Diag(CurrentLocation, diag::note_first_required_here); 4154 err = true; 4155 } 4156 } 4157 if (!err) 4158 MethodDecl->setUsed(); 4159 4160 CurContext = PreviousContext; 4161} 4162 4163CXXMethodDecl * 4164Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 4165 ParmVarDecl *ParmDecl, 4166 CXXRecordDecl *ClassDecl) { 4167 QualType LHSType = Context.getTypeDeclType(ClassDecl); 4168 QualType RHSType(LHSType); 4169 // If class's assignment operator argument is const/volatile qualified, 4170 // look for operator = (const/volatile B&). Otherwise, look for 4171 // operator = (B&). 4172 RHSType = Context.getCVRQualifiedType(RHSType, 4173 ParmDecl->getType().getCVRQualifiers()); 4174 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 4175 LHSType, 4176 SourceLocation())); 4177 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 4178 RHSType, 4179 CurrentLocation)); 4180 Expr *Args[2] = { &*LHS, &*RHS }; 4181 OverloadCandidateSet CandidateSet(CurrentLocation); 4182 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 4183 CandidateSet); 4184 OverloadCandidateSet::iterator Best; 4185 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 4186 return cast<CXXMethodDecl>(Best->Function); 4187 assert(false && 4188 "getAssignOperatorMethod - copy assignment operator method not found"); 4189 return 0; 4190} 4191 4192void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 4193 CXXConstructorDecl *CopyConstructor, 4194 unsigned TypeQuals) { 4195 assert((CopyConstructor->isImplicit() && 4196 CopyConstructor->isCopyConstructor(TypeQuals) && 4197 !CopyConstructor->isUsed()) && 4198 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 4199 4200 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 4201 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 4202 4203 DeclContext *PreviousContext = CurContext; 4204 CurContext = CopyConstructor; 4205 4206 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false)) { 4207 Diag(CurrentLocation, diag::note_member_synthesized_at) 4208 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 4209 CopyConstructor->setInvalidDecl(); 4210 } else { 4211 CopyConstructor->setUsed(); 4212 } 4213 4214 // FIXME: Once we teach SetBaseOrMemberInitializers to copy fields, we can 4215 // get rid of this code. 4216 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4217 FieldEnd = ClassDecl->field_end(); 4218 Field != FieldEnd; ++Field) { 4219 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 4220 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 4221 FieldType = Array->getElementType(); 4222 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4223 CXXRecordDecl *FieldClassDecl 4224 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4225 if (CXXConstructorDecl *FieldCopyCtor = 4226 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) { 4227 CheckDirectMemberAccess(Field->getLocation(), 4228 FieldCopyCtor, 4229 PDiag(diag::err_access_copy_field) 4230 << Field->getDeclName() << Field->getType()); 4231 4232 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 4233 } 4234 } 4235 } 4236 CopyConstructor->setUsed(); 4237 4238 CurContext = PreviousContext; 4239} 4240 4241Sema::OwningExprResult 4242Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4243 CXXConstructorDecl *Constructor, 4244 MultiExprArg ExprArgs, 4245 bool RequiresZeroInit, 4246 bool BaseInitialization) { 4247 bool Elidable = false; 4248 4249 // C++0x [class.copy]p34: 4250 // When certain criteria are met, an implementation is allowed to 4251 // omit the copy/move construction of a class object, even if the 4252 // copy/move constructor and/or destructor for the object have 4253 // side effects. [...] 4254 // - when a temporary class object that has not been bound to a 4255 // reference (12.2) would be copied/moved to a class object 4256 // with the same cv-unqualified type, the copy/move operation 4257 // can be omitted by constructing the temporary object 4258 // directly into the target of the omitted copy/move 4259 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 4260 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 4261 Elidable = SubExpr->isTemporaryObject() && 4262 Context.hasSameUnqualifiedType(SubExpr->getType(), 4263 Context.getTypeDeclType(Constructor->getParent())); 4264 } 4265 4266 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4267 Elidable, move(ExprArgs), RequiresZeroInit, 4268 BaseInitialization); 4269} 4270 4271/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4272/// including handling of its default argument expressions. 4273Sema::OwningExprResult 4274Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4275 CXXConstructorDecl *Constructor, bool Elidable, 4276 MultiExprArg ExprArgs, 4277 bool RequiresZeroInit, 4278 bool BaseInitialization) { 4279 unsigned NumExprs = ExprArgs.size(); 4280 Expr **Exprs = (Expr **)ExprArgs.release(); 4281 4282 MarkDeclarationReferenced(ConstructLoc, Constructor); 4283 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4284 Constructor, Elidable, Exprs, NumExprs, 4285 RequiresZeroInit, BaseInitialization)); 4286} 4287 4288bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4289 CXXConstructorDecl *Constructor, 4290 MultiExprArg Exprs) { 4291 OwningExprResult TempResult = 4292 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4293 move(Exprs)); 4294 if (TempResult.isInvalid()) 4295 return true; 4296 4297 Expr *Temp = TempResult.takeAs<Expr>(); 4298 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4299 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4300 VD->setInit(Temp); 4301 4302 return false; 4303} 4304 4305void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4306 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4307 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4308 !ClassDecl->hasTrivialDestructor()) { 4309 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4310 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4311 CheckDestructorAccess(VD->getLocation(), Destructor, 4312 PDiag(diag::err_access_dtor_var) 4313 << VD->getDeclName() 4314 << VD->getType()); 4315 } 4316} 4317 4318/// AddCXXDirectInitializerToDecl - This action is called immediately after 4319/// ActOnDeclarator, when a C++ direct initializer is present. 4320/// e.g: "int x(1);" 4321void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4322 SourceLocation LParenLoc, 4323 MultiExprArg Exprs, 4324 SourceLocation *CommaLocs, 4325 SourceLocation RParenLoc) { 4326 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4327 Decl *RealDecl = Dcl.getAs<Decl>(); 4328 4329 // If there is no declaration, there was an error parsing it. Just ignore 4330 // the initializer. 4331 if (RealDecl == 0) 4332 return; 4333 4334 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4335 if (!VDecl) { 4336 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4337 RealDecl->setInvalidDecl(); 4338 return; 4339 } 4340 4341 // We will represent direct-initialization similarly to copy-initialization: 4342 // int x(1); -as-> int x = 1; 4343 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4344 // 4345 // Clients that want to distinguish between the two forms, can check for 4346 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4347 // A major benefit is that clients that don't particularly care about which 4348 // exactly form was it (like the CodeGen) can handle both cases without 4349 // special case code. 4350 4351 // C++ 8.5p11: 4352 // The form of initialization (using parentheses or '=') is generally 4353 // insignificant, but does matter when the entity being initialized has a 4354 // class type. 4355 QualType DeclInitType = VDecl->getType(); 4356 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4357 DeclInitType = Context.getBaseElementType(Array); 4358 4359 if (!VDecl->getType()->isDependentType() && 4360 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4361 diag::err_typecheck_decl_incomplete_type)) { 4362 VDecl->setInvalidDecl(); 4363 return; 4364 } 4365 4366 // The variable can not have an abstract class type. 4367 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4368 diag::err_abstract_type_in_decl, 4369 AbstractVariableType)) 4370 VDecl->setInvalidDecl(); 4371 4372 const VarDecl *Def; 4373 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4374 Diag(VDecl->getLocation(), diag::err_redefinition) 4375 << VDecl->getDeclName(); 4376 Diag(Def->getLocation(), diag::note_previous_definition); 4377 VDecl->setInvalidDecl(); 4378 return; 4379 } 4380 4381 // If either the declaration has a dependent type or if any of the 4382 // expressions is type-dependent, we represent the initialization 4383 // via a ParenListExpr for later use during template instantiation. 4384 if (VDecl->getType()->isDependentType() || 4385 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4386 // Let clients know that initialization was done with a direct initializer. 4387 VDecl->setCXXDirectInitializer(true); 4388 4389 // Store the initialization expressions as a ParenListExpr. 4390 unsigned NumExprs = Exprs.size(); 4391 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4392 (Expr **)Exprs.release(), 4393 NumExprs, RParenLoc)); 4394 return; 4395 } 4396 4397 // Capture the variable that is being initialized and the style of 4398 // initialization. 4399 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4400 4401 // FIXME: Poor source location information. 4402 InitializationKind Kind 4403 = InitializationKind::CreateDirect(VDecl->getLocation(), 4404 LParenLoc, RParenLoc); 4405 4406 InitializationSequence InitSeq(*this, Entity, Kind, 4407 (Expr**)Exprs.get(), Exprs.size()); 4408 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4409 if (Result.isInvalid()) { 4410 VDecl->setInvalidDecl(); 4411 return; 4412 } 4413 4414 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4415 VDecl->setInit(Result.takeAs<Expr>()); 4416 VDecl->setCXXDirectInitializer(true); 4417 4418 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4419 FinalizeVarWithDestructor(VDecl, Record); 4420} 4421 4422/// \brief Given a constructor and the set of arguments provided for the 4423/// constructor, convert the arguments and add any required default arguments 4424/// to form a proper call to this constructor. 4425/// 4426/// \returns true if an error occurred, false otherwise. 4427bool 4428Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4429 MultiExprArg ArgsPtr, 4430 SourceLocation Loc, 4431 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4432 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4433 unsigned NumArgs = ArgsPtr.size(); 4434 Expr **Args = (Expr **)ArgsPtr.get(); 4435 4436 const FunctionProtoType *Proto 4437 = Constructor->getType()->getAs<FunctionProtoType>(); 4438 assert(Proto && "Constructor without a prototype?"); 4439 unsigned NumArgsInProto = Proto->getNumArgs(); 4440 4441 // If too few arguments are available, we'll fill in the rest with defaults. 4442 if (NumArgs < NumArgsInProto) 4443 ConvertedArgs.reserve(NumArgsInProto); 4444 else 4445 ConvertedArgs.reserve(NumArgs); 4446 4447 VariadicCallType CallType = 4448 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4449 llvm::SmallVector<Expr *, 8> AllArgs; 4450 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4451 Proto, 0, Args, NumArgs, AllArgs, 4452 CallType); 4453 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4454 ConvertedArgs.push_back(AllArgs[i]); 4455 return Invalid; 4456} 4457 4458static inline bool 4459CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4460 const FunctionDecl *FnDecl) { 4461 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4462 if (isa<NamespaceDecl>(DC)) { 4463 return SemaRef.Diag(FnDecl->getLocation(), 4464 diag::err_operator_new_delete_declared_in_namespace) 4465 << FnDecl->getDeclName(); 4466 } 4467 4468 if (isa<TranslationUnitDecl>(DC) && 4469 FnDecl->getStorageClass() == FunctionDecl::Static) { 4470 return SemaRef.Diag(FnDecl->getLocation(), 4471 diag::err_operator_new_delete_declared_static) 4472 << FnDecl->getDeclName(); 4473 } 4474 4475 return false; 4476} 4477 4478static inline bool 4479CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4480 CanQualType ExpectedResultType, 4481 CanQualType ExpectedFirstParamType, 4482 unsigned DependentParamTypeDiag, 4483 unsigned InvalidParamTypeDiag) { 4484 QualType ResultType = 4485 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4486 4487 // Check that the result type is not dependent. 4488 if (ResultType->isDependentType()) 4489 return SemaRef.Diag(FnDecl->getLocation(), 4490 diag::err_operator_new_delete_dependent_result_type) 4491 << FnDecl->getDeclName() << ExpectedResultType; 4492 4493 // Check that the result type is what we expect. 4494 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4495 return SemaRef.Diag(FnDecl->getLocation(), 4496 diag::err_operator_new_delete_invalid_result_type) 4497 << FnDecl->getDeclName() << ExpectedResultType; 4498 4499 // A function template must have at least 2 parameters. 4500 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4501 return SemaRef.Diag(FnDecl->getLocation(), 4502 diag::err_operator_new_delete_template_too_few_parameters) 4503 << FnDecl->getDeclName(); 4504 4505 // The function decl must have at least 1 parameter. 4506 if (FnDecl->getNumParams() == 0) 4507 return SemaRef.Diag(FnDecl->getLocation(), 4508 diag::err_operator_new_delete_too_few_parameters) 4509 << FnDecl->getDeclName(); 4510 4511 // Check the the first parameter type is not dependent. 4512 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4513 if (FirstParamType->isDependentType()) 4514 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4515 << FnDecl->getDeclName() << ExpectedFirstParamType; 4516 4517 // Check that the first parameter type is what we expect. 4518 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4519 ExpectedFirstParamType) 4520 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4521 << FnDecl->getDeclName() << ExpectedFirstParamType; 4522 4523 return false; 4524} 4525 4526static bool 4527CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4528 // C++ [basic.stc.dynamic.allocation]p1: 4529 // A program is ill-formed if an allocation function is declared in a 4530 // namespace scope other than global scope or declared static in global 4531 // scope. 4532 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4533 return true; 4534 4535 CanQualType SizeTy = 4536 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4537 4538 // C++ [basic.stc.dynamic.allocation]p1: 4539 // The return type shall be void*. The first parameter shall have type 4540 // std::size_t. 4541 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4542 SizeTy, 4543 diag::err_operator_new_dependent_param_type, 4544 diag::err_operator_new_param_type)) 4545 return true; 4546 4547 // C++ [basic.stc.dynamic.allocation]p1: 4548 // The first parameter shall not have an associated default argument. 4549 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4550 return SemaRef.Diag(FnDecl->getLocation(), 4551 diag::err_operator_new_default_arg) 4552 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4553 4554 return false; 4555} 4556 4557static bool 4558CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4559 // C++ [basic.stc.dynamic.deallocation]p1: 4560 // A program is ill-formed if deallocation functions are declared in a 4561 // namespace scope other than global scope or declared static in global 4562 // scope. 4563 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4564 return true; 4565 4566 // C++ [basic.stc.dynamic.deallocation]p2: 4567 // Each deallocation function shall return void and its first parameter 4568 // shall be void*. 4569 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4570 SemaRef.Context.VoidPtrTy, 4571 diag::err_operator_delete_dependent_param_type, 4572 diag::err_operator_delete_param_type)) 4573 return true; 4574 4575 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4576 if (FirstParamType->isDependentType()) 4577 return SemaRef.Diag(FnDecl->getLocation(), 4578 diag::err_operator_delete_dependent_param_type) 4579 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4580 4581 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4582 SemaRef.Context.VoidPtrTy) 4583 return SemaRef.Diag(FnDecl->getLocation(), 4584 diag::err_operator_delete_param_type) 4585 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4586 4587 return false; 4588} 4589 4590/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4591/// of this overloaded operator is well-formed. If so, returns false; 4592/// otherwise, emits appropriate diagnostics and returns true. 4593bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4594 assert(FnDecl && FnDecl->isOverloadedOperator() && 4595 "Expected an overloaded operator declaration"); 4596 4597 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4598 4599 // C++ [over.oper]p5: 4600 // The allocation and deallocation functions, operator new, 4601 // operator new[], operator delete and operator delete[], are 4602 // described completely in 3.7.3. The attributes and restrictions 4603 // found in the rest of this subclause do not apply to them unless 4604 // explicitly stated in 3.7.3. 4605 if (Op == OO_Delete || Op == OO_Array_Delete) 4606 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4607 4608 if (Op == OO_New || Op == OO_Array_New) 4609 return CheckOperatorNewDeclaration(*this, FnDecl); 4610 4611 // C++ [over.oper]p6: 4612 // An operator function shall either be a non-static member 4613 // function or be a non-member function and have at least one 4614 // parameter whose type is a class, a reference to a class, an 4615 // enumeration, or a reference to an enumeration. 4616 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4617 if (MethodDecl->isStatic()) 4618 return Diag(FnDecl->getLocation(), 4619 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4620 } else { 4621 bool ClassOrEnumParam = false; 4622 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4623 ParamEnd = FnDecl->param_end(); 4624 Param != ParamEnd; ++Param) { 4625 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4626 if (ParamType->isDependentType() || ParamType->isRecordType() || 4627 ParamType->isEnumeralType()) { 4628 ClassOrEnumParam = true; 4629 break; 4630 } 4631 } 4632 4633 if (!ClassOrEnumParam) 4634 return Diag(FnDecl->getLocation(), 4635 diag::err_operator_overload_needs_class_or_enum) 4636 << FnDecl->getDeclName(); 4637 } 4638 4639 // C++ [over.oper]p8: 4640 // An operator function cannot have default arguments (8.3.6), 4641 // except where explicitly stated below. 4642 // 4643 // Only the function-call operator allows default arguments 4644 // (C++ [over.call]p1). 4645 if (Op != OO_Call) { 4646 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4647 Param != FnDecl->param_end(); ++Param) { 4648 if ((*Param)->hasDefaultArg()) 4649 return Diag((*Param)->getLocation(), 4650 diag::err_operator_overload_default_arg) 4651 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4652 } 4653 } 4654 4655 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4656 { false, false, false } 4657#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4658 , { Unary, Binary, MemberOnly } 4659#include "clang/Basic/OperatorKinds.def" 4660 }; 4661 4662 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4663 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4664 bool MustBeMemberOperator = OperatorUses[Op][2]; 4665 4666 // C++ [over.oper]p8: 4667 // [...] Operator functions cannot have more or fewer parameters 4668 // than the number required for the corresponding operator, as 4669 // described in the rest of this subclause. 4670 unsigned NumParams = FnDecl->getNumParams() 4671 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4672 if (Op != OO_Call && 4673 ((NumParams == 1 && !CanBeUnaryOperator) || 4674 (NumParams == 2 && !CanBeBinaryOperator) || 4675 (NumParams < 1) || (NumParams > 2))) { 4676 // We have the wrong number of parameters. 4677 unsigned ErrorKind; 4678 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4679 ErrorKind = 2; // 2 -> unary or binary. 4680 } else if (CanBeUnaryOperator) { 4681 ErrorKind = 0; // 0 -> unary 4682 } else { 4683 assert(CanBeBinaryOperator && 4684 "All non-call overloaded operators are unary or binary!"); 4685 ErrorKind = 1; // 1 -> binary 4686 } 4687 4688 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4689 << FnDecl->getDeclName() << NumParams << ErrorKind; 4690 } 4691 4692 // Overloaded operators other than operator() cannot be variadic. 4693 if (Op != OO_Call && 4694 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4695 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4696 << FnDecl->getDeclName(); 4697 } 4698 4699 // Some operators must be non-static member functions. 4700 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4701 return Diag(FnDecl->getLocation(), 4702 diag::err_operator_overload_must_be_member) 4703 << FnDecl->getDeclName(); 4704 } 4705 4706 // C++ [over.inc]p1: 4707 // The user-defined function called operator++ implements the 4708 // prefix and postfix ++ operator. If this function is a member 4709 // function with no parameters, or a non-member function with one 4710 // parameter of class or enumeration type, it defines the prefix 4711 // increment operator ++ for objects of that type. If the function 4712 // is a member function with one parameter (which shall be of type 4713 // int) or a non-member function with two parameters (the second 4714 // of which shall be of type int), it defines the postfix 4715 // increment operator ++ for objects of that type. 4716 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 4717 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 4718 bool ParamIsInt = false; 4719 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 4720 ParamIsInt = BT->getKind() == BuiltinType::Int; 4721 4722 if (!ParamIsInt) 4723 return Diag(LastParam->getLocation(), 4724 diag::err_operator_overload_post_incdec_must_be_int) 4725 << LastParam->getType() << (Op == OO_MinusMinus); 4726 } 4727 4728 // Notify the class if it got an assignment operator. 4729 if (Op == OO_Equal) { 4730 // Would have returned earlier otherwise. 4731 assert(isa<CXXMethodDecl>(FnDecl) && 4732 "Overloaded = not member, but not filtered."); 4733 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 4734 Method->getParent()->addedAssignmentOperator(Context, Method); 4735 } 4736 4737 return false; 4738} 4739 4740/// CheckLiteralOperatorDeclaration - Check whether the declaration 4741/// of this literal operator function is well-formed. If so, returns 4742/// false; otherwise, emits appropriate diagnostics and returns true. 4743bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 4744 DeclContext *DC = FnDecl->getDeclContext(); 4745 Decl::Kind Kind = DC->getDeclKind(); 4746 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 4747 Kind != Decl::LinkageSpec) { 4748 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 4749 << FnDecl->getDeclName(); 4750 return true; 4751 } 4752 4753 bool Valid = false; 4754 4755 // template <char...> type operator "" name() is the only valid template 4756 // signature, and the only valid signature with no parameters. 4757 if (FnDecl->param_size() == 0) { 4758 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 4759 // Must have only one template parameter 4760 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 4761 if (Params->size() == 1) { 4762 NonTypeTemplateParmDecl *PmDecl = 4763 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 4764 4765 // The template parameter must be a char parameter pack. 4766 // FIXME: This test will always fail because non-type parameter packs 4767 // have not been implemented. 4768 if (PmDecl && PmDecl->isTemplateParameterPack() && 4769 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 4770 Valid = true; 4771 } 4772 } 4773 } else { 4774 // Check the first parameter 4775 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4776 4777 QualType T = (*Param)->getType(); 4778 4779 // unsigned long long int, long double, and any character type are allowed 4780 // as the only parameters. 4781 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 4782 Context.hasSameType(T, Context.LongDoubleTy) || 4783 Context.hasSameType(T, Context.CharTy) || 4784 Context.hasSameType(T, Context.WCharTy) || 4785 Context.hasSameType(T, Context.Char16Ty) || 4786 Context.hasSameType(T, Context.Char32Ty)) { 4787 if (++Param == FnDecl->param_end()) 4788 Valid = true; 4789 goto FinishedParams; 4790 } 4791 4792 // Otherwise it must be a pointer to const; let's strip those qualifiers. 4793 const PointerType *PT = T->getAs<PointerType>(); 4794 if (!PT) 4795 goto FinishedParams; 4796 T = PT->getPointeeType(); 4797 if (!T.isConstQualified()) 4798 goto FinishedParams; 4799 T = T.getUnqualifiedType(); 4800 4801 // Move on to the second parameter; 4802 ++Param; 4803 4804 // If there is no second parameter, the first must be a const char * 4805 if (Param == FnDecl->param_end()) { 4806 if (Context.hasSameType(T, Context.CharTy)) 4807 Valid = true; 4808 goto FinishedParams; 4809 } 4810 4811 // const char *, const wchar_t*, const char16_t*, and const char32_t* 4812 // are allowed as the first parameter to a two-parameter function 4813 if (!(Context.hasSameType(T, Context.CharTy) || 4814 Context.hasSameType(T, Context.WCharTy) || 4815 Context.hasSameType(T, Context.Char16Ty) || 4816 Context.hasSameType(T, Context.Char32Ty))) 4817 goto FinishedParams; 4818 4819 // The second and final parameter must be an std::size_t 4820 T = (*Param)->getType().getUnqualifiedType(); 4821 if (Context.hasSameType(T, Context.getSizeType()) && 4822 ++Param == FnDecl->param_end()) 4823 Valid = true; 4824 } 4825 4826 // FIXME: This diagnostic is absolutely terrible. 4827FinishedParams: 4828 if (!Valid) { 4829 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 4830 << FnDecl->getDeclName(); 4831 return true; 4832 } 4833 4834 return false; 4835} 4836 4837/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 4838/// linkage specification, including the language and (if present) 4839/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 4840/// the location of the language string literal, which is provided 4841/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 4842/// the '{' brace. Otherwise, this linkage specification does not 4843/// have any braces. 4844Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 4845 SourceLocation ExternLoc, 4846 SourceLocation LangLoc, 4847 const char *Lang, 4848 unsigned StrSize, 4849 SourceLocation LBraceLoc) { 4850 LinkageSpecDecl::LanguageIDs Language; 4851 if (strncmp(Lang, "\"C\"", StrSize) == 0) 4852 Language = LinkageSpecDecl::lang_c; 4853 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 4854 Language = LinkageSpecDecl::lang_cxx; 4855 else { 4856 Diag(LangLoc, diag::err_bad_language); 4857 return DeclPtrTy(); 4858 } 4859 4860 // FIXME: Add all the various semantics of linkage specifications 4861 4862 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 4863 LangLoc, Language, 4864 LBraceLoc.isValid()); 4865 CurContext->addDecl(D); 4866 PushDeclContext(S, D); 4867 return DeclPtrTy::make(D); 4868} 4869 4870/// ActOnFinishLinkageSpecification - Completely the definition of 4871/// the C++ linkage specification LinkageSpec. If RBraceLoc is 4872/// valid, it's the position of the closing '}' brace in a linkage 4873/// specification that uses braces. 4874Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 4875 DeclPtrTy LinkageSpec, 4876 SourceLocation RBraceLoc) { 4877 if (LinkageSpec) 4878 PopDeclContext(); 4879 return LinkageSpec; 4880} 4881 4882/// \brief Perform semantic analysis for the variable declaration that 4883/// occurs within a C++ catch clause, returning the newly-created 4884/// variable. 4885VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 4886 TypeSourceInfo *TInfo, 4887 IdentifierInfo *Name, 4888 SourceLocation Loc, 4889 SourceRange Range) { 4890 bool Invalid = false; 4891 4892 // Arrays and functions decay. 4893 if (ExDeclType->isArrayType()) 4894 ExDeclType = Context.getArrayDecayedType(ExDeclType); 4895 else if (ExDeclType->isFunctionType()) 4896 ExDeclType = Context.getPointerType(ExDeclType); 4897 4898 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 4899 // The exception-declaration shall not denote a pointer or reference to an 4900 // incomplete type, other than [cv] void*. 4901 // N2844 forbids rvalue references. 4902 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 4903 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 4904 Invalid = true; 4905 } 4906 4907 // GCC allows catching pointers and references to incomplete types 4908 // as an extension; so do we, but we warn by default. 4909 4910 QualType BaseType = ExDeclType; 4911 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 4912 unsigned DK = diag::err_catch_incomplete; 4913 bool IncompleteCatchIsInvalid = true; 4914 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 4915 BaseType = Ptr->getPointeeType(); 4916 Mode = 1; 4917 DK = diag::ext_catch_incomplete_ptr; 4918 IncompleteCatchIsInvalid = false; 4919 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 4920 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 4921 BaseType = Ref->getPointeeType(); 4922 Mode = 2; 4923 DK = diag::ext_catch_incomplete_ref; 4924 IncompleteCatchIsInvalid = false; 4925 } 4926 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 4927 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 4928 IncompleteCatchIsInvalid) 4929 Invalid = true; 4930 4931 if (!Invalid && !ExDeclType->isDependentType() && 4932 RequireNonAbstractType(Loc, ExDeclType, 4933 diag::err_abstract_type_in_decl, 4934 AbstractVariableType)) 4935 Invalid = true; 4936 4937 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 4938 Name, ExDeclType, TInfo, VarDecl::None, 4939 VarDecl::None); 4940 4941 if (!Invalid) { 4942 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 4943 // C++ [except.handle]p16: 4944 // The object declared in an exception-declaration or, if the 4945 // exception-declaration does not specify a name, a temporary (12.2) is 4946 // copy-initialized (8.5) from the exception object. [...] 4947 // The object is destroyed when the handler exits, after the destruction 4948 // of any automatic objects initialized within the handler. 4949 // 4950 // We just pretend to initialize the object with itself, then make sure 4951 // it can be destroyed later. 4952 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 4953 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 4954 Loc, ExDeclType, 0); 4955 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 4956 SourceLocation()); 4957 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 4958 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4959 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 4960 if (Result.isInvalid()) 4961 Invalid = true; 4962 else 4963 FinalizeVarWithDestructor(ExDecl, RecordTy); 4964 } 4965 } 4966 4967 if (Invalid) 4968 ExDecl->setInvalidDecl(); 4969 4970 return ExDecl; 4971} 4972 4973/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 4974/// handler. 4975Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 4976 TypeSourceInfo *TInfo = 0; 4977 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 4978 4979 bool Invalid = D.isInvalidType(); 4980 IdentifierInfo *II = D.getIdentifier(); 4981 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 4982 LookupOrdinaryName, 4983 ForRedeclaration)) { 4984 // The scope should be freshly made just for us. There is just no way 4985 // it contains any previous declaration. 4986 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 4987 if (PrevDecl->isTemplateParameter()) { 4988 // Maybe we will complain about the shadowed template parameter. 4989 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4990 } 4991 } 4992 4993 if (D.getCXXScopeSpec().isSet() && !Invalid) { 4994 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 4995 << D.getCXXScopeSpec().getRange(); 4996 Invalid = true; 4997 } 4998 4999 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5000 D.getIdentifier(), 5001 D.getIdentifierLoc(), 5002 D.getDeclSpec().getSourceRange()); 5003 5004 if (Invalid) 5005 ExDecl->setInvalidDecl(); 5006 5007 // Add the exception declaration into this scope. 5008 if (II) 5009 PushOnScopeChains(ExDecl, S); 5010 else 5011 CurContext->addDecl(ExDecl); 5012 5013 ProcessDeclAttributes(S, ExDecl, D); 5014 return DeclPtrTy::make(ExDecl); 5015} 5016 5017Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5018 ExprArg assertexpr, 5019 ExprArg assertmessageexpr) { 5020 Expr *AssertExpr = (Expr *)assertexpr.get(); 5021 StringLiteral *AssertMessage = 5022 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5023 5024 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5025 llvm::APSInt Value(32); 5026 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5027 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5028 AssertExpr->getSourceRange(); 5029 return DeclPtrTy(); 5030 } 5031 5032 if (Value == 0) { 5033 Diag(AssertLoc, diag::err_static_assert_failed) 5034 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5035 } 5036 } 5037 5038 assertexpr.release(); 5039 assertmessageexpr.release(); 5040 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5041 AssertExpr, AssertMessage); 5042 5043 CurContext->addDecl(Decl); 5044 return DeclPtrTy::make(Decl); 5045} 5046 5047/// \brief Perform semantic analysis of the given friend type declaration. 5048/// 5049/// \returns A friend declaration that. 5050FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 5051 TypeSourceInfo *TSInfo) { 5052 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 5053 5054 QualType T = TSInfo->getType(); 5055 SourceRange TypeRange = TSInfo->getTypeLoc().getSourceRange(); 5056 5057 if (!getLangOptions().CPlusPlus0x) { 5058 // C++03 [class.friend]p2: 5059 // An elaborated-type-specifier shall be used in a friend declaration 5060 // for a class.* 5061 // 5062 // * The class-key of the elaborated-type-specifier is required. 5063 if (!ActiveTemplateInstantiations.empty()) { 5064 // Do not complain about the form of friend template types during 5065 // template instantiation; we will already have complained when the 5066 // template was declared. 5067 } else if (!T->isElaboratedTypeSpecifier()) { 5068 // If we evaluated the type to a record type, suggest putting 5069 // a tag in front. 5070 if (const RecordType *RT = T->getAs<RecordType>()) { 5071 RecordDecl *RD = RT->getDecl(); 5072 5073 std::string InsertionText = std::string(" ") + RD->getKindName(); 5074 5075 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 5076 << (unsigned) RD->getTagKind() 5077 << T 5078 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 5079 InsertionText); 5080 } else { 5081 Diag(FriendLoc, diag::ext_nonclass_type_friend) 5082 << T 5083 << SourceRange(FriendLoc, TypeRange.getEnd()); 5084 } 5085 } else if (T->getAs<EnumType>()) { 5086 Diag(FriendLoc, diag::ext_enum_friend) 5087 << T 5088 << SourceRange(FriendLoc, TypeRange.getEnd()); 5089 } 5090 } 5091 5092 // C++0x [class.friend]p3: 5093 // If the type specifier in a friend declaration designates a (possibly 5094 // cv-qualified) class type, that class is declared as a friend; otherwise, 5095 // the friend declaration is ignored. 5096 5097 // FIXME: C++0x has some syntactic restrictions on friend type declarations 5098 // in [class.friend]p3 that we do not implement. 5099 5100 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 5101} 5102 5103/// Handle a friend type declaration. This works in tandem with 5104/// ActOnTag. 5105/// 5106/// Notes on friend class templates: 5107/// 5108/// We generally treat friend class declarations as if they were 5109/// declaring a class. So, for example, the elaborated type specifier 5110/// in a friend declaration is required to obey the restrictions of a 5111/// class-head (i.e. no typedefs in the scope chain), template 5112/// parameters are required to match up with simple template-ids, &c. 5113/// However, unlike when declaring a template specialization, it's 5114/// okay to refer to a template specialization without an empty 5115/// template parameter declaration, e.g. 5116/// friend class A<T>::B<unsigned>; 5117/// We permit this as a special case; if there are any template 5118/// parameters present at all, require proper matching, i.e. 5119/// template <> template <class T> friend class A<int>::B; 5120Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5121 MultiTemplateParamsArg TempParams) { 5122 SourceLocation Loc = DS.getSourceRange().getBegin(); 5123 5124 assert(DS.isFriendSpecified()); 5125 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5126 5127 // Try to convert the decl specifier to a type. This works for 5128 // friend templates because ActOnTag never produces a ClassTemplateDecl 5129 // for a TUK_Friend. 5130 Declarator TheDeclarator(DS, Declarator::MemberContext); 5131 TypeSourceInfo *TSI; 5132 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 5133 if (TheDeclarator.isInvalidType()) 5134 return DeclPtrTy(); 5135 5136 if (!TSI) 5137 TSI = Context.getTrivialTypeSourceInfo(T, DS.getSourceRange().getBegin()); 5138 5139 // This is definitely an error in C++98. It's probably meant to 5140 // be forbidden in C++0x, too, but the specification is just 5141 // poorly written. 5142 // 5143 // The problem is with declarations like the following: 5144 // template <T> friend A<T>::foo; 5145 // where deciding whether a class C is a friend or not now hinges 5146 // on whether there exists an instantiation of A that causes 5147 // 'foo' to equal C. There are restrictions on class-heads 5148 // (which we declare (by fiat) elaborated friend declarations to 5149 // be) that makes this tractable. 5150 // 5151 // FIXME: handle "template <> friend class A<T>;", which 5152 // is possibly well-formed? Who even knows? 5153 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5154 Diag(Loc, diag::err_tagless_friend_type_template) 5155 << DS.getSourceRange(); 5156 return DeclPtrTy(); 5157 } 5158 5159 // C++98 [class.friend]p1: A friend of a class is a function 5160 // or class that is not a member of the class . . . 5161 // This is fixed in DR77, which just barely didn't make the C++03 5162 // deadline. It's also a very silly restriction that seriously 5163 // affects inner classes and which nobody else seems to implement; 5164 // thus we never diagnose it, not even in -pedantic. 5165 // 5166 // But note that we could warn about it: it's always useless to 5167 // friend one of your own members (it's not, however, worthless to 5168 // friend a member of an arbitrary specialization of your template). 5169 5170 Decl *D; 5171 if (unsigned NumTempParamLists = TempParams.size()) 5172 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5173 NumTempParamLists, 5174 (TemplateParameterList**) TempParams.release(), 5175 TSI, 5176 DS.getFriendSpecLoc()); 5177 else 5178 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 5179 5180 if (!D) 5181 return DeclPtrTy(); 5182 5183 D->setAccess(AS_public); 5184 CurContext->addDecl(D); 5185 5186 return DeclPtrTy::make(D); 5187} 5188 5189Sema::DeclPtrTy 5190Sema::ActOnFriendFunctionDecl(Scope *S, 5191 Declarator &D, 5192 bool IsDefinition, 5193 MultiTemplateParamsArg TemplateParams) { 5194 const DeclSpec &DS = D.getDeclSpec(); 5195 5196 assert(DS.isFriendSpecified()); 5197 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5198 5199 SourceLocation Loc = D.getIdentifierLoc(); 5200 TypeSourceInfo *TInfo = 0; 5201 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5202 5203 // C++ [class.friend]p1 5204 // A friend of a class is a function or class.... 5205 // Note that this sees through typedefs, which is intended. 5206 // It *doesn't* see through dependent types, which is correct 5207 // according to [temp.arg.type]p3: 5208 // If a declaration acquires a function type through a 5209 // type dependent on a template-parameter and this causes 5210 // a declaration that does not use the syntactic form of a 5211 // function declarator to have a function type, the program 5212 // is ill-formed. 5213 if (!T->isFunctionType()) { 5214 Diag(Loc, diag::err_unexpected_friend); 5215 5216 // It might be worthwhile to try to recover by creating an 5217 // appropriate declaration. 5218 return DeclPtrTy(); 5219 } 5220 5221 // C++ [namespace.memdef]p3 5222 // - If a friend declaration in a non-local class first declares a 5223 // class or function, the friend class or function is a member 5224 // of the innermost enclosing namespace. 5225 // - The name of the friend is not found by simple name lookup 5226 // until a matching declaration is provided in that namespace 5227 // scope (either before or after the class declaration granting 5228 // friendship). 5229 // - If a friend function is called, its name may be found by the 5230 // name lookup that considers functions from namespaces and 5231 // classes associated with the types of the function arguments. 5232 // - When looking for a prior declaration of a class or a function 5233 // declared as a friend, scopes outside the innermost enclosing 5234 // namespace scope are not considered. 5235 5236 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5237 DeclarationName Name = GetNameForDeclarator(D); 5238 assert(Name); 5239 5240 // The context we found the declaration in, or in which we should 5241 // create the declaration. 5242 DeclContext *DC; 5243 5244 // FIXME: handle local classes 5245 5246 // Recover from invalid scope qualifiers as if they just weren't there. 5247 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5248 ForRedeclaration); 5249 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5250 // FIXME: RequireCompleteDeclContext 5251 DC = computeDeclContext(ScopeQual); 5252 5253 // FIXME: handle dependent contexts 5254 if (!DC) return DeclPtrTy(); 5255 5256 LookupQualifiedName(Previous, DC); 5257 5258 // If searching in that context implicitly found a declaration in 5259 // a different context, treat it like it wasn't found at all. 5260 // TODO: better diagnostics for this case. Suggesting the right 5261 // qualified scope would be nice... 5262 // FIXME: getRepresentativeDecl() is not right here at all 5263 if (Previous.empty() || 5264 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5265 D.setInvalidType(); 5266 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5267 return DeclPtrTy(); 5268 } 5269 5270 // C++ [class.friend]p1: A friend of a class is a function or 5271 // class that is not a member of the class . . . 5272 if (DC->Equals(CurContext)) 5273 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5274 5275 // Otherwise walk out to the nearest namespace scope looking for matches. 5276 } else { 5277 // TODO: handle local class contexts. 5278 5279 DC = CurContext; 5280 while (true) { 5281 // Skip class contexts. If someone can cite chapter and verse 5282 // for this behavior, that would be nice --- it's what GCC and 5283 // EDG do, and it seems like a reasonable intent, but the spec 5284 // really only says that checks for unqualified existing 5285 // declarations should stop at the nearest enclosing namespace, 5286 // not that they should only consider the nearest enclosing 5287 // namespace. 5288 while (DC->isRecord()) 5289 DC = DC->getParent(); 5290 5291 LookupQualifiedName(Previous, DC); 5292 5293 // TODO: decide what we think about using declarations. 5294 if (!Previous.empty()) 5295 break; 5296 5297 if (DC->isFileContext()) break; 5298 DC = DC->getParent(); 5299 } 5300 5301 // C++ [class.friend]p1: A friend of a class is a function or 5302 // class that is not a member of the class . . . 5303 // C++0x changes this for both friend types and functions. 5304 // Most C++ 98 compilers do seem to give an error here, so 5305 // we do, too. 5306 if (!Previous.empty() && DC->Equals(CurContext) 5307 && !getLangOptions().CPlusPlus0x) 5308 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5309 } 5310 5311 if (DC->isFileContext()) { 5312 // This implies that it has to be an operator or function. 5313 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5314 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5315 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5316 Diag(Loc, diag::err_introducing_special_friend) << 5317 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5318 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5319 return DeclPtrTy(); 5320 } 5321 } 5322 5323 bool Redeclaration = false; 5324 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5325 move(TemplateParams), 5326 IsDefinition, 5327 Redeclaration); 5328 if (!ND) return DeclPtrTy(); 5329 5330 assert(ND->getDeclContext() == DC); 5331 assert(ND->getLexicalDeclContext() == CurContext); 5332 5333 // Add the function declaration to the appropriate lookup tables, 5334 // adjusting the redeclarations list as necessary. We don't 5335 // want to do this yet if the friending class is dependent. 5336 // 5337 // Also update the scope-based lookup if the target context's 5338 // lookup context is in lexical scope. 5339 if (!CurContext->isDependentContext()) { 5340 DC = DC->getLookupContext(); 5341 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5342 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5343 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5344 } 5345 5346 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5347 D.getIdentifierLoc(), ND, 5348 DS.getFriendSpecLoc()); 5349 FrD->setAccess(AS_public); 5350 CurContext->addDecl(FrD); 5351 5352 return DeclPtrTy::make(ND); 5353} 5354 5355void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5356 AdjustDeclIfTemplate(dcl); 5357 5358 Decl *Dcl = dcl.getAs<Decl>(); 5359 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5360 if (!Fn) { 5361 Diag(DelLoc, diag::err_deleted_non_function); 5362 return; 5363 } 5364 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5365 Diag(DelLoc, diag::err_deleted_decl_not_first); 5366 Diag(Prev->getLocation(), diag::note_previous_declaration); 5367 // If the declaration wasn't the first, we delete the function anyway for 5368 // recovery. 5369 } 5370 Fn->setDeleted(); 5371} 5372 5373static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5374 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5375 ++CI) { 5376 Stmt *SubStmt = *CI; 5377 if (!SubStmt) 5378 continue; 5379 if (isa<ReturnStmt>(SubStmt)) 5380 Self.Diag(SubStmt->getSourceRange().getBegin(), 5381 diag::err_return_in_constructor_handler); 5382 if (!isa<Expr>(SubStmt)) 5383 SearchForReturnInStmt(Self, SubStmt); 5384 } 5385} 5386 5387void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5388 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5389 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5390 SearchForReturnInStmt(*this, Handler); 5391 } 5392} 5393 5394bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5395 const CXXMethodDecl *Old) { 5396 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5397 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5398 5399 if (Context.hasSameType(NewTy, OldTy) || 5400 NewTy->isDependentType() || OldTy->isDependentType()) 5401 return false; 5402 5403 // Check if the return types are covariant 5404 QualType NewClassTy, OldClassTy; 5405 5406 /// Both types must be pointers or references to classes. 5407 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5408 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5409 NewClassTy = NewPT->getPointeeType(); 5410 OldClassTy = OldPT->getPointeeType(); 5411 } 5412 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5413 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5414 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5415 NewClassTy = NewRT->getPointeeType(); 5416 OldClassTy = OldRT->getPointeeType(); 5417 } 5418 } 5419 } 5420 5421 // The return types aren't either both pointers or references to a class type. 5422 if (NewClassTy.isNull()) { 5423 Diag(New->getLocation(), 5424 diag::err_different_return_type_for_overriding_virtual_function) 5425 << New->getDeclName() << NewTy << OldTy; 5426 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5427 5428 return true; 5429 } 5430 5431 // C++ [class.virtual]p6: 5432 // If the return type of D::f differs from the return type of B::f, the 5433 // class type in the return type of D::f shall be complete at the point of 5434 // declaration of D::f or shall be the class type D. 5435 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5436 if (!RT->isBeingDefined() && 5437 RequireCompleteType(New->getLocation(), NewClassTy, 5438 PDiag(diag::err_covariant_return_incomplete) 5439 << New->getDeclName())) 5440 return true; 5441 } 5442 5443 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5444 // Check if the new class derives from the old class. 5445 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5446 Diag(New->getLocation(), 5447 diag::err_covariant_return_not_derived) 5448 << New->getDeclName() << NewTy << OldTy; 5449 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5450 return true; 5451 } 5452 5453 // Check if we the conversion from derived to base is valid. 5454 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5455 diag::err_covariant_return_inaccessible_base, 5456 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5457 // FIXME: Should this point to the return type? 5458 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 5459 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5460 return true; 5461 } 5462 } 5463 5464 // The qualifiers of the return types must be the same. 5465 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5466 Diag(New->getLocation(), 5467 diag::err_covariant_return_type_different_qualifications) 5468 << New->getDeclName() << NewTy << OldTy; 5469 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5470 return true; 5471 }; 5472 5473 5474 // The new class type must have the same or less qualifiers as the old type. 5475 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5476 Diag(New->getLocation(), 5477 diag::err_covariant_return_type_class_type_more_qualified) 5478 << New->getDeclName() << NewTy << OldTy; 5479 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5480 return true; 5481 }; 5482 5483 return false; 5484} 5485 5486bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5487 const CXXMethodDecl *Old) 5488{ 5489 if (Old->hasAttr<FinalAttr>()) { 5490 Diag(New->getLocation(), diag::err_final_function_overridden) 5491 << New->getDeclName(); 5492 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5493 return true; 5494 } 5495 5496 return false; 5497} 5498 5499/// \brief Mark the given method pure. 5500/// 5501/// \param Method the method to be marked pure. 5502/// 5503/// \param InitRange the source range that covers the "0" initializer. 5504bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5505 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5506 Method->setPure(); 5507 5508 // A class is abstract if at least one function is pure virtual. 5509 Method->getParent()->setAbstract(true); 5510 return false; 5511 } 5512 5513 if (!Method->isInvalidDecl()) 5514 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5515 << Method->getDeclName() << InitRange; 5516 return true; 5517} 5518 5519/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5520/// an initializer for the out-of-line declaration 'Dcl'. The scope 5521/// is a fresh scope pushed for just this purpose. 5522/// 5523/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5524/// static data member of class X, names should be looked up in the scope of 5525/// class X. 5526void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5527 // If there is no declaration, there was an error parsing it. 5528 Decl *D = Dcl.getAs<Decl>(); 5529 if (D == 0) return; 5530 5531 // We should only get called for declarations with scope specifiers, like: 5532 // int foo::bar; 5533 assert(D->isOutOfLine()); 5534 EnterDeclaratorContext(S, D->getDeclContext()); 5535} 5536 5537/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5538/// initializer for the out-of-line declaration 'Dcl'. 5539void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5540 // If there is no declaration, there was an error parsing it. 5541 Decl *D = Dcl.getAs<Decl>(); 5542 if (D == 0) return; 5543 5544 assert(D->isOutOfLine()); 5545 ExitDeclaratorContext(S); 5546} 5547 5548/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5549/// C++ if/switch/while/for statement. 5550/// e.g: "if (int x = f()) {...}" 5551Action::DeclResult 5552Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5553 // C++ 6.4p2: 5554 // The declarator shall not specify a function or an array. 5555 // The type-specifier-seq shall not contain typedef and shall not declare a 5556 // new class or enumeration. 5557 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5558 "Parser allowed 'typedef' as storage class of condition decl."); 5559 5560 TypeSourceInfo *TInfo = 0; 5561 TagDecl *OwnedTag = 0; 5562 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5563 5564 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5565 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5566 // would be created and CXXConditionDeclExpr wants a VarDecl. 5567 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5568 << D.getSourceRange(); 5569 return DeclResult(); 5570 } else if (OwnedTag && OwnedTag->isDefinition()) { 5571 // The type-specifier-seq shall not declare a new class or enumeration. 5572 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5573 } 5574 5575 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5576 if (!Dcl) 5577 return DeclResult(); 5578 5579 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5580 VD->setDeclaredInCondition(true); 5581 return Dcl; 5582} 5583 5584static bool needsVTable(CXXMethodDecl *MD, ASTContext &Context) { 5585 // Ignore dependent types. 5586 if (MD->isDependentContext()) 5587 return false; 5588 5589 // Ignore declarations that are not definitions. 5590 if (!MD->isThisDeclarationADefinition()) 5591 return false; 5592 5593 CXXRecordDecl *RD = MD->getParent(); 5594 5595 // Ignore classes without a vtable. 5596 if (!RD->isDynamicClass()) 5597 return false; 5598 5599 switch (MD->getParent()->getTemplateSpecializationKind()) { 5600 case TSK_Undeclared: 5601 case TSK_ExplicitSpecialization: 5602 // Classes that aren't instantiations of templates don't need their 5603 // virtual methods marked until we see the definition of the key 5604 // function. 5605 break; 5606 5607 case TSK_ImplicitInstantiation: 5608 // This is a constructor of a class template; mark all of the virtual 5609 // members as referenced to ensure that they get instantiatied. 5610 if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) 5611 return true; 5612 break; 5613 5614 case TSK_ExplicitInstantiationDeclaration: 5615 return false; 5616 5617 case TSK_ExplicitInstantiationDefinition: 5618 // This is method of a explicit instantiation; mark all of the virtual 5619 // members as referenced to ensure that they get instantiatied. 5620 return true; 5621 } 5622 5623 // Consider only out-of-line definitions of member functions. When we see 5624 // an inline definition, it's too early to compute the key function. 5625 if (!MD->isOutOfLine()) 5626 return false; 5627 5628 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5629 5630 // If there is no key function, we will need a copy of the vtable. 5631 if (!KeyFunction) 5632 return true; 5633 5634 // If this is the key function, we need to mark virtual members. 5635 if (KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) 5636 return true; 5637 5638 return false; 5639} 5640 5641void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5642 CXXMethodDecl *MD) { 5643 CXXRecordDecl *RD = MD->getParent(); 5644 5645 // We will need to mark all of the virtual members as referenced to build the 5646 // vtable. 5647 if (!needsVTable(MD, Context)) 5648 return; 5649 5650 TemplateSpecializationKind kind = RD->getTemplateSpecializationKind(); 5651 if (kind == TSK_ImplicitInstantiation) 5652 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 5653 else 5654 MarkVirtualMembersReferenced(Loc, RD); 5655} 5656 5657bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5658 if (ClassesWithUnmarkedVirtualMembers.empty()) 5659 return false; 5660 5661 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 5662 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 5663 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 5664 ClassesWithUnmarkedVirtualMembers.pop_back(); 5665 MarkVirtualMembersReferenced(Loc, RD); 5666 } 5667 5668 return true; 5669} 5670 5671void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 5672 const CXXRecordDecl *RD) { 5673 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5674 e = RD->method_end(); i != e; ++i) { 5675 CXXMethodDecl *MD = *i; 5676 5677 // C++ [basic.def.odr]p2: 5678 // [...] A virtual member function is used if it is not pure. [...] 5679 if (MD->isVirtual() && !MD->isPure()) 5680 MarkDeclarationReferenced(Loc, MD); 5681 } 5682 5683 // Only classes that have virtual bases need a VTT. 5684 if (RD->getNumVBases() == 0) 5685 return; 5686 5687 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 5688 e = RD->bases_end(); i != e; ++i) { 5689 const CXXRecordDecl *Base = 5690 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 5691 if (i->isVirtual()) 5692 continue; 5693 if (Base->getNumVBases() == 0) 5694 continue; 5695 MarkVirtualMembersReferenced(Loc, Base); 5696 } 5697} 5698